EP3412411B1 - Tensioning system - Google Patents

Tensioning system Download PDF

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Publication number
EP3412411B1
EP3412411B1 EP18172783.5A EP18172783A EP3412411B1 EP 3412411 B1 EP3412411 B1 EP 3412411B1 EP 18172783 A EP18172783 A EP 18172783A EP 3412411 B1 EP3412411 B1 EP 3412411B1
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EP
European Patent Office
Prior art keywords
clamping
elements
adjusting element
clamping elements
contact surface
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EP18172783.5A
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German (de)
French (fr)
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EP3412411A1 (en
Inventor
Frank Nickl
Jacek Woryna
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/003—Combinations of clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction

Definitions

  • the invention relates to a clamping system for clamping a blank.
  • Such raw parts can in particular be formed by cast parts, which typically consist of metallic materials.
  • FIG. 1 shows a clamping unit 1 according to the prior art in order to fix such a cast part 2, in the present case a die-cast part, on a base formed by a clamping plate 3.
  • the clamping unit comprises three separate clamping devices 4, which are anchored on the upper side of the clamping plate, these clamping devices preferably being fixed on the clamping plate by mechanical means.
  • the clamping devices must be arranged by a production engineer on the top of the clamping plate in order to fix it at suitable points on the cast part. This process is often cumbersome and time-consuming. This is based in particular on the fact that after clamping on the clamping plate, the cast part has to be machined in predefined work steps. The equipment engineer then has to fix the clamping device in places on the casting that do not have to be machined later.
  • the DE 27 36 412 A1 relates to a device for the rapid connection and positioning of a tool holder with a carrier.
  • the tool holder has a shank part which can be inserted into a bore of a carrier.
  • radially movable locking elements are provided on the shaft or on the carrier, which can be brought into contact with a shoulder on the respective other of the two parts to be connected by an actuating element, the tool holder and the carrier for cooperating elements of contact parts have axial position determination, while an actuator is provided in the carrier for setting the actuating element.
  • the actuator can be designed in the form of a pressure pin which is actuated with an actuating ball.
  • the EP 0 322 617 A2 relates to a hydraulic clamping device in which a piston is guided with guide means in a hydraulic cylinder.
  • the DE 20 2016 001 906 U1 relates to a device for clamping and centering a bore within a workpiece.
  • the JP 2014 030 892 A relates to a clamping device having a plurality of grippers which can be brought into engagement with the inner surface of a hole of a workpiece.
  • the EP 0 913 588 A2 relates to a clamping unit which has a push rod with balls for fixing a workpiece.
  • the DE 103 38 850 A1 relates to a clamping mandrel for the internal clamping of workpieces, for example gearwheels, the clamping mandrel having a clamping cylinder with clamping elements designed to be radially adjustable in the clamping cylinder and a loading unit for the clamping elements.
  • the loading unit have an adjusting device based on piezo elements.
  • the U.S. 5,746,436 A relates to a compressed air operated clamping device.
  • a head that can be moved in the axial direction deflects swiveling clamping elements for carrying out clamping processes.
  • the invention is based on the object of providing a clamping system by means of which an efficient and reproducible clamping of a blank is made possible.
  • the invention relates to a clamping system for clamping a blank, with an arrangement of at least three clamping elements which can be moved between a release position and a clamping position by means of an adjusting element.
  • the clamping elements are disengaged in the release position and in engagement with a contact surface of a receptacle of the tubular part in the clamping position.
  • the clamping elements are coupled to the adjusting element via a spherical compensating element, so that when the adjusting element moves into a clamping position, the spherical compensating element executes a compensating movement through which the clamping elements are uniformly guided against the contact surface of the receptacle.
  • the clamping elements are mounted on swivel bearings.
  • the clamping system according to the invention can be used for clamping unmachined parts of different designs.
  • the raw parts are in particular formed from cast parts which typically consist of metallic materials. Furthermore, the raw parts can also be formed from welded structures, burn-out parts and the like.
  • An essential advantage of the invention is that at least one receptacle is provided on the blank, which is provided on a side wall, in particular on the underside of the blank.
  • the blank with this side wall can be set up on a base and the clamping system can then be brought up to the blank from the underside of the base in order to clamp it.
  • several receptacles can also be provided on the side wall of the blank, so that the blank can be fixed to the base with several clamping systems. This ensures that the upper side of the blank to be machined remains free, so that the clamping system or systems do not result in any restrictions whatsoever for the machining of the blank.
  • Another essential advantage of the invention is that the clamping system according to the invention enables automated machining of the blank.
  • clamping processes can be carried out automatically with the clamping system (s) themselves.
  • the clamping system is particularly advantageously actuated by means of a pneumatic system.
  • electrical or hydraulic actuation means can also be provided; in the simplest case, mechanical actuation means are provided.
  • the clamping process is thus carried out in an automated manner in that the adjusting element is moved into a clamping position, preferably with a pneumatic unit, whereby the clamping elements are moved into their clamping position in which they are in engagement with the contact surface of the receptacle and thus hold the blank in its target position.
  • the clamping elements are also released from the contact surface automatically and automatically.
  • the adjusting element is moved from the clamping position into a release position.
  • the clamping elements are automatically released from the contact surface of the receptacle.
  • This release process is preferably supported by spring elements which exert corresponding restoring forces on the tensioning elements.
  • Another essential advantage of the clamping system according to the invention is that it can be used to clamp the blank in a reproducible, safe and highly accurate manner. Precise clamping of this kind is generally not trivial because raw parts, especially cast parts, have considerable tolerances in terms of their dimensions. Of course, this also applies to the recording as part of this blank.
  • this fact is taken into account in that the individual tensioning elements do not carry out fixed, predetermined relative movements in order to carry out the tensioning process. If this were the case, tolerance-related irregularities in the geometry of the receptacle could result in only some, but not all, of the clamping elements being firmly in engagement with the contact surface when the clamping elements are moved and thus not all clamping elements contribute to the clamping process.
  • this problem is solved in a surprisingly simple manner in that the tensioning elements are coupled to the adjusting element via a spherical compensating element, the adjusting element being movably arranged on a support surface of the adjusting element.
  • the individual clamping elements are no longer rigidly coupled to one another and also not rigidly coupled to the adjusting element.
  • the clamping elements individually carry out compensating movements when it is introduced into the clamping position, with these compensating movements ensuring that all clamping elements are pressed evenly and thus with essentially the same pressing forces against the contact surface when the adjusting element is retracted into the clamping position and is the clamping elements are in their clamping positions.
  • This compensating movement generally takes place in that when a tensioning element is guided against the contact surface, the tensioning element exerts a counterforce on the spherical compensating element, whereby it is moved in the direction of the other tensioning elements that are not yet in contact with the contact surface.
  • the clamping elements are synchronized in such a way that when the adjusting element is moved, the clamping elements are guided against the contact surface with the same contact pressures.
  • a uniform clamping process can be implemented particularly well in that the clamping elements are of identical design.
  • the clamping elements are mounted on pivot bearings.
  • Each tensioning element has a tip at its front end which, in the tensioning position of the tensioning element, is guided against the contact surface of the receptacle.
  • the adjusting element can be displaced in its longitudinal direction.
  • the axes of the pivot mounting of the clamping elements are oriented perpendicular to the longitudinal axis of the adjusting element.
  • the linear movement of the adjusting element is thus deflected into the pivoting movement of the clamping elements.
  • This implementation takes place via the spherical compensation element, which is movable on the support surface.
  • the support surface is advantageously formed by an end face of the adjusting element.
  • the bearing surface is expediently a flat surface and the diameter of the bearing surface is adapted to the diameter of the spherical compensating element.
  • the pivoting movements of the clamping elements and the geometries of the tips of the clamping elements are particularly advantageously adapted and optimized so that the clamped blank lies against a contact surface and that the clamping elements moved into individual clamping positions exert a force on the workpiece in the direction of the contact surface.
  • the receptacle is formed by a recess of the workpiece that opens out on a side wall, the traveling segment of the workpiece delimiting the recess forming the contact surface.
  • the recess advantageously has a circular cross section, that is to say the receptacle is designed as a hollow cylinder.
  • the clamping elements are introduced into the cavity of the receptacle from the inside, the tips of the clamping elements then being pivoted outward and thus being guided against the contact surface of the receptacle.
  • the tensioning elements can be coupled directly to the adjusting element via the spherical compensating element.
  • the outer contours of the clamping elements are advantageously adapted to the spherical compensating element so that the contact of the clamping elements with the spherical compensating element, the clamping elements are transferred to their clamping position when the adjusting element is moved into the clamping position.
  • This provides a particularly simple mechanism for actuating the tensioning elements.
  • the receptacle is formed by a pin protruding from a side wall of the workpiece, the jacket surface of the pin forming the contact surface.
  • the pin advantageously has a circular cross section, that is to say the pin has a cylindrical shape.
  • the clamping elements must be brought up to the pin forming the receptacle from the outside.
  • each tensioning element is coupled to the spherical compensating element via a deflecting element.
  • the outer contours of the deflecting elements are appropriately adapted to the spherical compensating element in such a way that the contact of the spherical compensating element with the deflecting element causes a deflection movement with which the clamping elements coupled to the deflecting elements are transferred to their clamping position when the adjusting element is moved into the clamping position.
  • the linear movement of the adjusting element is thus easily converted into pivoting movements of the clamping elements, so that these are guided from the outside against the lateral surface of the pin.
  • the clamping elements when the adjusting element is moved from the clamping position into a release position, the clamping elements are transferred into their release position by forced guidance of the clamping elements on the adjusting element and by restoring forces exerted by spring elements.
  • FIGS. 2 - 6 show a first exemplary embodiment of a clamping unit 1 for clamping a blank, which in the present case is formed by a cast part 2.
  • the blank clamped with the clamping unit 1 can be processed in a suitable manner.
  • the clamping unit 1 has two essentially identically designed clamping systems 5. Depending on the design of the cast part 2 to be clamped, more than two clamping systems 5 or only one clamping system 5 can be provided.
  • the cast part 2 is clamped with the clamping systems 5, with receptacles being provided on the underside of the cast part 2 for this purpose.
  • the clamping systems 5 themselves are fastened to a base, not shown, such as a clamping plate 3.
  • Each clamping system 5 sits on a base 5a, fastened with screws 6.
  • a height compensation for adaptation to the contour of the underside of the cast part 2 can take place by means of different bases 5a or similar compensation segments.
  • Each clamping system 5 has an upper part 7 and a lower part 8, which are fixed to one another with further screws 9.
  • each clamping system 5 has an adjusting element 10 which can be displaced in its longitudinal direction by means of a pneumatic unit (not shown). Corresponding pneumatic connections 11 are provided for connection to the pneumatic unit.
  • the adjusting element 10 is formed by an elongated, essentially cylindrical part, the adjusting element 10 being mounted displaced along its longitudinal axis.
  • the upper end face 10a of the adjustment element 10 forms a flat support surface.
  • a spherical compensating element 12 is movably mounted on this support surface.
  • the spherical compensating element 12 consists of a solid ball, the diameter of which is adapted to the diameter of the adjusting element 10.
  • the adjusting element 10 and the spherical compensating element 12 are assigned three identically designed clamping elements 13.
  • cylindrical shaft segments 14 open out, which form a pivot axis on which the clamping element 13 is pivotably mounted.
  • the shaft segments 14 of the clamping elements 13 are each mounted in corresponding rotary bearings, half of which are formed by a segment of the upper part 7 and a segment of the lower part 8, as from the Figures 4 and 5 evident.
  • the pivot axes of the clamping elements 13 run perpendicular to the longitudinal axis of the adjusting element 10.
  • a tip 13a protruding transversely from its base body is provided at the upper end of a tensioning element 13. The tip 13a is used to fix it in the receptacle of the cast part 2.
  • the receptacles consist of recesses 15 which open out on the underside of the cast part 2.
  • the recesses 15 have a circular cross section which is constant over the entire height of the respective recess 15.
  • the recess 15 can also be designed to be slightly conical. It is also not essential to provide a circular cross-section.
  • the recesses 15 are delimited by a cylindrical base surface of the cast part 2, which form a contact surface 16.
  • each tensioning element 13 is supported on a spring element 17 which is mounted in the lower part 8.
  • each tensioning element 13 has a curvature on a side facing the adjusting element 10.
  • the adjusting element 10 has a notch 10b which forms a stop for the lower edge of the respective tensioning element 13.
  • the adjusting element 10 is moved out of its longitudinal direction by means of the pneumatic unit Figure 4 shown release position in its in Figure 5 shown clamping position retracted.
  • the clamping elements 13 are pivoted into their release position by the restoring forces of the spring elements 17.
  • the clamping elements 13 are pivoted in the direction of the adjusting element 10 in such a way that their tips 13a do not protrude beyond the side surface of the upper part 7.
  • the upper part 7 of the clamping system 5 can be easily inserted into the recess 15.
  • the pivoting movements of the clamping elements 13 are predetermined by the curvatures of the individual clamping elements 13.
  • the spherical compensating element 12 Since the spherical compensating element 12 is freely movable on the support surface of the adjusting element 10 and the spherical compensating element 12 is only coupled to the tensioning element 13 by contacting the curved or inclined side surfaces, the spherical compensating element 12 can be oriented perpendicular to the longitudinal axis of the adjusting element 10 Carry out a corresponding compensation movement on the level on the support surface. If a clamping element 13 with a tip 13a then comes into contact with the contact surface 16, the counterforce exerted thereby moves the spherical compensating element 12 in the opposite direction, whereby the other clamping elements 13 with their tips 13a are increasingly guided against the contact surface 16.
  • FIG. 5 shows the clamping element 13 in its clamping position and the adjusting element 10 in its clamping position. In this clamping position, the front edge of a clamping element 13 rests against the stop formed by the notch 10b of the adjusting elements 10.
  • the tips 13a of the clamping elements 13 are advantageously designed in such a way that when the syringes of the contact surface 16 are pressed, a force is exerted downwards and thus against the contact surface of the clamping system 5, which further improves the hold of the cast part 2 by the clamping system 5.
  • the adjusting element 10 with the pneumatic unit is safely moved into the release position so that the tips 13a of the clamping elements 13 are pivoted into the upper part 7 by the restoring forces of the spring elements 17 and also by a forced guidance of the clamping elements 13 on the adjusting element 10, until the clamping elements 13 in the in Figure 4 shown release position.
  • the cast part 2 can thus be released from the clamping system 5.
  • the Figures 6 - 9 show a second exemplary embodiment of the clamping unit 1 according to the invention.
  • the receptacles of the cast part 2 consist of pegs 18 which protrude from its underside.
  • the pins 18 have a circular cross section that is constant over their height. In general, other cross-sectional shapes are also possible, with the cross-section generally not having to be constant even over the height.
  • the cylindrical outer jacket surface of a pin 18 forms the contact surface 16.
  • the pins 18 serve as receptacles only for fastening the cast part 2 and can be removed therefrom after the cast part 2 has been processed.
  • the spherical compensating element 12 is in turn movably supported on the front end face 10a of the adjusting element 10, which face forms a flat support surface.
  • the adjusting element 10 is not in contact with deflection elements 19 via the spherical compensating element 12, a deflection element 19 in each case being connected to a tensioning element 13.
  • Each deflecting element 19 is mounted displaceably in the horizontal direction in the lower part 8, that is to say the deflecting elements 19 can perform translational movements perpendicular to the longitudinal axis of the adjusting element 10.
  • the first longitudinal end of a deflecting element 19 is delimited by an inclined surface 19 a, which rests on the spherical compensating element 12.
  • the other longitudinal end rests laterally on the clamping element 13 in the area below the pivot axis.
  • each tensioning element 13 rests against a ball element 20, which rests on the spring element 17 exerting the restoring force, the spring element 17 being positively guided in a recess in the lower part 8.
  • Figure 8 shows the adjustment element 10 in its release position, that is, in its lower limit position.
  • the spherical compensating element 12 has moved down so far that it rests in the lower region of the inclined surface 19a of the deflecting elements 19.
  • the clamping elements 13 are pivoted back into the area of the upper part 7 and held there by the restoring forces of the spring elements 17.
  • the pin 18 can be inserted into the area of the upper part 7 with the clamping elements 13, this area being designed in the form of a recess which opens out on the upper side of the upper part 7.
  • the diameter of this recess is adapted to the outer diameter of the pin 18, so that the pin 18 lies in the recess of the upper part 7 with little play.
  • the pneumatic unit moves the adjusting element 10 from the release position into the clamping position.
  • the spherical compensating element 12 is pushed upwards and slides along the inclined surfaces 19a of the deflecting elements 19.
  • the contact pressure exerted by the adjusting element 10 via the spherical compensating element 12 moves the deflecting elements 19 outward.
  • the clamping elements 13 are pivoted against the restoring forces of the spring elements 17 and the tips 13a of the clamping elements 13 are guided against the contact surface 16 of the pin 18.
  • the tips 13a of the clamping elements 13 point slightly downwards again, so that the cast part 2 with the respective pins 18 is guided into the recess of the upper part 7 of the clamping system 5 through the clamping process, which further improves the hold of the cast part 2 on the clamping system 5 will.
  • the pneumatic unit moves the adjusting element 10 back into the release position, whereby the clamping elements 13 are transferred to their release position and are held there with the spring elements 17 ( Figure 8 ).
  • the pin 18 of the cast part 2 can be pulled out of the recess in the upper part 7 of the clamping system 5.

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Description

Die Erfindung betrifft ein Spannsystem zum Spannen eines Rohteils. Derartige Rohteile können insbesondere von Gussteilen gebildet sein, die typischerweise aus metallischen Werkstoffen bestehen.The invention relates to a clamping system for clamping a blank. Such raw parts can in particular be formed by cast parts, which typically consist of metallic materials.

Figur 1 zeigt eine Spanneinheit 1 gemäß dem Stand der Technik um ein solches Gussteil 2, im vorliegenden Fall ein Druckgussteil, auf eine von einer Spannplatte 3 gebildeten Unterlage zu fixieren. Die Spanneinheit umfasst drei separate Spannvorrichtungen 4, die auf der Oberseite der Spannplatte verankert werden, wobei diese Spannvorrichtungen vorzugsweise mit mechanischen Mitteln auf der Spannplatte fixiert werden. Je nach Form und Größe des Gussteils müssen die Spannvorrichtungen von einem Betriebsmittelingenieur auf der Oberseite der Spannplatte angeordnet werden, um diese an geeigneten Stellen des Gussteils zu fixieren. Dieser Vorgang gestaltet sich oft umständlich und zeitaufwändig. Dies beruht insbesondere auf der Tatsache, dass nach dem Spannen auf der Spannplatte das Gussteil in vordefinierte Arbeitsschritten bearbeitet werden muss. Der Betriebsmittelingenieur muss dann die Spannvorrichtung an Stellen des Gussteils fixieren, die später nicht bearbeitet werden müssen. Figure 1 shows a clamping unit 1 according to the prior art in order to fix such a cast part 2, in the present case a die-cast part, on a base formed by a clamping plate 3. The clamping unit comprises three separate clamping devices 4, which are anchored on the upper side of the clamping plate, these clamping devices preferably being fixed on the clamping plate by mechanical means. Depending on the shape and size of the cast part, the clamping devices must be arranged by a production engineer on the top of the clamping plate in order to fix it at suitable points on the cast part. This process is often cumbersome and time-consuming. This is based in particular on the fact that after clamping on the clamping plate, the cast part has to be machined in predefined work steps. The equipment engineer then has to fix the clamping device in places on the casting that do not have to be machined later.

Die DE 27 36 412 A1 betrifft eine Einrichtung zur schnellen Verbindung und Positionierung eines Werkzeughalters mit einem Träger. Der Werkzeughalter besitzt einen Schaftteil, der eine Bohrung eines Trägers einfügbar ist. Weiterhin sind radial bewegliche Verriegelungselemente am Schaft oder am Träger vorgesehen, die durch ein Betätigungselement in Anlage an eine Schulter an dem jeweils anderen der beiden zu verbindenden Teile bringbar sind, wobei der Werkzeughalter und der Träger zusammenwirkende Elemente von Anlageteilen zur axialen Lagebestimmung aufweisen, während in dem Träger zur Einstellung des Betätigungselements ein Betätiger vorgesehen ist. Der Betätiger kann in Form eines Druckbolzens ausgebildet sein, der mit einer Betätigungskugel betätigt wird.the DE 27 36 412 A1 relates to a device for the rapid connection and positioning of a tool holder with a carrier. The tool holder has a shank part which can be inserted into a bore of a carrier. Furthermore, radially movable locking elements are provided on the shaft or on the carrier, which can be brought into contact with a shoulder on the respective other of the two parts to be connected by an actuating element, the tool holder and the carrier for cooperating elements of contact parts have axial position determination, while an actuator is provided in the carrier for setting the actuating element. The actuator can be designed in the form of a pressure pin which is actuated with an actuating ball.

Die EP 0 322 617 A2 betrifft eine hydraulische Spannvorrichtung, bei welcher ein Kolben mit Führungsmitteln in einem Hydraulikzylinder geführt ist.the EP 0 322 617 A2 relates to a hydraulic clamping device in which a piston is guided with guide means in a hydraulic cylinder.

Die DE 20 2016 001 906 U1 betrifft eine Vorrichtung zum Klemmen und Zentrieren einer Bohrung innerhalb eines Werkstücks.the DE 20 2016 001 906 U1 relates to a device for clamping and centering a bore within a workpiece.

Die JP 2014 030 892 A betrifft eine Spannvorrichtung mit mehreren Greifern, die in Eingriff mit der inneren Oberfläche eines Lochs eines Werkstücks gebracht werden können.the JP 2014 030 892 A relates to a clamping device having a plurality of grippers which can be brought into engagement with the inner surface of a hole of a workpiece.

Die EP 0 913 588 A2 betrifft eine Spanneinheit, die eine Druckstange mit Kugeln zur Fixierung eines Werkstücks aufweist.the EP 0 913 588 A2 relates to a clamping unit which has a push rod with balls for fixing a workpiece.

Die DE 103 38 850 A1 betrifft einen Spanndorn zur Innen-Spannbefestigung von Werkstücken, bspw. Zahnrädern, wobei der Spanndorn einen Spannzylinder aufweist mit in dem Spannzylinder radial verstellbar ausgebildeten Spannelementen und einer Beaufschlagungseinheit für die Spannelemente. Um einen Spanndorrn der in Rede stehenden Art verbessert auszugestalten wird vorgeschlagen, dass die Beaufschlagungseinheit eine Verstelleinrichtung auf Basis von Piezoelementen aufweist.the DE 103 38 850 A1 relates to a clamping mandrel for the internal clamping of workpieces, for example gearwheels, the clamping mandrel having a clamping cylinder with clamping elements designed to be radially adjustable in the clamping cylinder and a loading unit for the clamping elements. In order to improve a mandrel of the type in question, it is proposed that the loading unit have an adjusting device based on piezo elements.

Durch eine Strombeaufschlagung der Piezoelemente werden diese gedehnt. Dadurch wird eine Axialverlagerung eines Beaufschlagungsdorns bewirkt, die über eine Kugel eine Verstellung eines Zwischenhebelabschnitts des Spannelements bewirkt, was die radiale Auslenkung eines Hebelabschnitts durch elastische Verformung eines Festkörpergelenks zur Folge hat.When a current is applied to the piezo elements, they are stretched. This causes an axial displacement of an impingement mandrel, which causes an adjustment of an intermediate lever section of the tensioning element via a ball, which results in the radial deflection of a lever section by elastic deformation of a flexure joint.

Die US 5 746 436 A betrifft eine druckluftbetriebene Spannvorrichtung. Ein in axialer Richtung bewegbarer Kopf lenkt schwenkbare Spannelemente zur Durchführung von Spannvorgängen aus.the U.S. 5,746,436 A relates to a compressed air operated clamping device. A head that can be moved in the axial direction deflects swiveling clamping elements for carrying out clamping processes.

Der Erfindung liegt die Aufgabe zugrunde, ein Spannsystem bereitzustellen, mittels dessen ein rationelles und reproduzierbares Spannen eines Rohteils ermöglicht wird.The invention is based on the object of providing a clamping system by means of which an efficient and reproducible clamping of a blank is made possible.

Zur Lösung dieser Aufgabe sind die Merkmale des Anspruchs 1 vorgesehen. Vorteilhafte Ausführungsformen und zweckmäßige Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.To solve this problem, the features of claim 1 are provided. Advantageous embodiments and expedient developments of the invention are described in the dependent claims.

Die Erfindung betrifft ein Spannsystem zum Spannen eines Rohteils, mit einer Anordnung von wenigstens drei Spannelementen, welche mittels eines Verstellelements zwischen einer Lösestellung und einer Spannstellung bewegbar sind. Die Spannelemente sind in der Lösestellung außer Eingriff und in der Spannstellung in Eingriff mit einer Kontaktfläche einer Aufnahme des Rohrteils. Die Spannelemente werden über ein kugelförmiges Ausgleichselement an das Verstellelement gekoppelt, sodass bei Bewegungen des Verstellelements in eine Spannposition das kugelförmige Ausgleichselement eine Ausgleichsbewegung ausführt, durch welche die Spannelemente gleichförmig gegen die Kontaktfläche der Aufnahme geführt sind. Die Spannelemente sind an Schwenklagerungen gelagert.The invention relates to a clamping system for clamping a blank, with an arrangement of at least three clamping elements which can be moved between a release position and a clamping position by means of an adjusting element. The clamping elements are disengaged in the release position and in engagement with a contact surface of a receptacle of the tubular part in the clamping position. The clamping elements are coupled to the adjusting element via a spherical compensating element, so that when the adjusting element moves into a clamping position, the spherical compensating element executes a compensating movement through which the clamping elements are uniformly guided against the contact surface of the receptacle. The clamping elements are mounted on swivel bearings.

Das erfindungsgemäße Spannsystem kann zum Spannen von Rohteilen unterschiedlicher Ausprägungen eingesetzt werden. Die Rohteile sind insbesondere von Gussteilen, die typischerweise aus metallischen Werkstoffen bestehen, gebildet. Weiterhin können die Rohteile auch von Schweißkonstruktionen, Ausbrennteilen und dergleichen gebildet sein.The clamping system according to the invention can be used for clamping unmachined parts of different designs. The raw parts are in particular formed from cast parts which typically consist of metallic materials. Furthermore, the raw parts can also be formed from welded structures, burn-out parts and the like.

Ein wesentlicher Vorteil der Erfindung besteht darin, dass an dem Rohteil wenigstens eine Aufnahme vorgesehen ist, die an einer Seitenwand, insbesondere an der Unterseite des Rohteils vorgesehen ist. Damit kann das Rohteil mit dieser Seitenwand auf einer Unterlage aufgestellt werden und das Spannsystem kann dann von der Unterseite der Unterlage an das Rohteil herangeführt werden um dieses zu spannen. Natürlich können an der Seitenwand des Rohteils auch mehrere Aufnahmen vorgesehen sein, sodass das Rohteil mit mehreren Spannsystemen an der Unterlage fixiert werden kann. Dadurch wird erreicht, dass die zu bearbeitende Oberseite des Rohteils freibleibt, sodass durch das oder die Spannsysteme keinerlei Restriktionen für die Bearbeitung des Rohteils entstehen.An essential advantage of the invention is that at least one receptacle is provided on the blank, which is provided on a side wall, in particular on the underside of the blank. In this way, the blank with this side wall can be set up on a base and the clamping system can then be brought up to the blank from the underside of the base in order to clamp it. Of course, several receptacles can also be provided on the side wall of the blank, so that the blank can be fixed to the base with several clamping systems. This ensures that the upper side of the blank to be machined remains free, so that the clamping system or systems do not result in any restrictions whatsoever for the machining of the blank.

Ein weiterer wesentlicher Vorteil der Erfindung besteht darin, dass mit dem erfindungsgemäßen Spannsystem eine automatisierte Bearbeitung des Rohteils ermöglicht wird.Another essential advantage of the invention is that the clamping system according to the invention enables automated machining of the blank.

Gegenüber einem aus dem Stand der Technik bekannten Spannsystem entfällt eine manuelle Ausrichtung von Spannvorrichtungen am zu bearbeitenden Teil des Rohteils.Compared to a clamping system known from the prior art, there is no manual alignment of clamping devices on the part of the blank to be machined.

Weiterhin kann das Durchführen der Spannvorgänge mit dem oder den Spannsystemen selbst automatisiert erfolgen. Besonders vorteilhaft wird das Spannsystem mittels eines Pneumatiksystems betätigt. Alternativ können auch elektrische oder hydraulische Betätigungsmittel vorgesehen sein, im einfachsten Fall sind mechanische Betätigungsmittel vorgesehen.Furthermore, the clamping processes can be carried out automatically with the clamping system (s) themselves. The clamping system is particularly advantageously actuated by means of a pneumatic system. Alternatively, electrical or hydraulic actuation means can also be provided; in the simplest case, mechanical actuation means are provided.

Der Spannvorgang wird somit automatisiert dadurch durchgeführt, dass das Verstellelement vorzugsweise mit einer Pneumatikeinheit in eine Spannposition eingefahren wird, wodurch die Spannelemente in ihre Spannstellung bewegt werden, in welcher diese in Eingriff mit der Kontaktfläche der Aufnahme sind und so das Rohteil in seiner Sollposition halten.The clamping process is thus carried out in an automated manner in that the adjusting element is moved into a clamping position, preferably with a pneumatic unit, whereby the clamping elements are moved into their clamping position in which they are in engagement with the contact surface of the receptacle and thus hold the blank in its target position.

Auch das Lösen der Spannelemente von der Kontaktfläche erfolgt selbsttätig und automatisiert. Hierzu wird das Verstellelement aus der Spannposition in eine Löseposition verfahren. Dadurch werden die Spannelemente selbsttätig von der Kontaktfläche der Aufnahme gelöst. Dieser Lösevorgang wird vorzugsweise durch Federelemente, die entsprechende Rückstellkräfte auf die Spannelemente ausüben, unterstützt.The clamping elements are also released from the contact surface automatically and automatically. For this purpose, the adjusting element is moved from the clamping position into a release position. As a result, the clamping elements are automatically released from the contact surface of the receptacle. This release process is preferably supported by spring elements which exert corresponding restoring forces on the tensioning elements.

Ein weiterer wesentlicher Vorteil des erfindungsgemäßen Spannsystems besteht darin, dass mit diesem das Rohteil reproduzierbar, sicher und hochgenau gespannt werden kann. Ein solches präzises Spannen ist generell deshalb nicht trivial, da Rohteile, insbesondere Gussteile, erhebliche Toleranzen in ihren Abmessungen aufweisen. Dies gilt natürlich auch für die Aufnahme als Bestandteil dieses Rohteils.Another essential advantage of the clamping system according to the invention is that it can be used to clamp the blank in a reproducible, safe and highly accurate manner. Precise clamping of this kind is generally not trivial because raw parts, especially cast parts, have considerable tolerances in terms of their dimensions. Of course, this also applies to the recording as part of this blank.

Bei dem erfindungsgemäßen Spannsystem wird diesem Umstand dadurch Rechnung getragen, dass die einzelnen Spannelemente nicht fest vorgegebene Relativbewegungen zur Durchführung des Spannvorgangs durchführen. Wäre dies der Fall, könnte es aufgrund toleranzbedingter Unregelmäßigkeiten der Geometrie der Aufnahme dazu kommen, dass bei Verfahren der Spannelemente nur einige aber nicht alle fest in Eingriff mit der Kontaktfläche sind und damit nicht alle Spannelemente zum Spannvorgang beitragen.In the tensioning system according to the invention, this fact is taken into account in that the individual tensioning elements do not carry out fixed, predetermined relative movements in order to carry out the tensioning process. If this were the case, tolerance-related irregularities in the geometry of the receptacle could result in only some, but not all, of the clamping elements being firmly in engagement with the contact surface when the clamping elements are moved and thus not all clamping elements contribute to the clamping process.

Dies würde zu unvollständigen, nicht reproduzierbaren Spannvorgängen führen.This would lead to incomplete, non-reproducible clamping processes.

Erfindungsgemäß wird diese Problematik auf überraschend einfache Weise dadurch gelöst, dass die Spannelemente über ein kugelförmiges Ausgleichselement an das Verstellelement gekoppelt sind, wobei das Verstellelement auf einer Auflagefläche des Verstellelements beweglich angeordnet ist. Dadurch sind die einzelnen Spannelemente nicht mehr starr untereinander und auch nicht starr an das Verstellelement gekoppelt. Damit führen die Spannelemente einzeln Ausgleichsbewegungen aus, wenn das in die Spannposition eingeführt ist, wobei durch diese Ausgleichsbewegungen gewährleistet ist, das alle Spannelemente gleichmäßig und damit mit in Wesentlichen gleichen Anpresskräften gegen die Kontaktfläche gepresst sind, wenn das Verstellelement in die Spannposition eingefahren ist und sich die Spannelemente in ihren Spannstellungen befinden. Diese Ausgleichsbewegung erfolgt generell dadurch, dass dann, wenn ein Spannelement gegen die Kontaktfläche geführt ist, das Spannelement eine Gegenkraft auf das kugelförmige Ausgleichselement ausübt, wodurch dieses in Richtung der anderen Spannelemente bewegt wird, die noch nicht in Kontakt mit der Kontaktfläche sind. Durch diese Ausgleichsbewegung werden die Spannelemente derart gleichgeschaltet, dass bei der Bewegung des Verstellelements die Spannelemente mit gleichen Anpressdrücken gegen die Kontaktfläche geführt sind.According to the invention, this problem is solved in a surprisingly simple manner in that the tensioning elements are coupled to the adjusting element via a spherical compensating element, the adjusting element being movably arranged on a support surface of the adjusting element. As a result, the individual clamping elements are no longer rigidly coupled to one another and also not rigidly coupled to the adjusting element. Thus, the clamping elements individually carry out compensating movements when it is introduced into the clamping position, with these compensating movements ensuring that all clamping elements are pressed evenly and thus with essentially the same pressing forces against the contact surface when the adjusting element is retracted into the clamping position and is the clamping elements are in their clamping positions. This compensating movement generally takes place in that when a tensioning element is guided against the contact surface, the tensioning element exerts a counterforce on the spherical compensating element, whereby it is moved in the direction of the other tensioning elements that are not yet in contact with the contact surface. By means of this compensating movement, the clamping elements are synchronized in such a way that when the adjusting element is moved, the clamping elements are guided against the contact surface with the same contact pressures.

Dadurch wird ein präzises und reproduzierbares Spannen des Rohteils erhalten, da unabhängig von Toleranzen der Kontaktfläche der Aufnahme die Spannelemente stets mit im Wesentlichen gleichen Anpressdruck gegen die Kontaktfläche der Aufnahme geführt sind.As a result, a precise and reproducible clamping of the blank is obtained, since the clamping elements are always guided with essentially the same contact pressure against the contact surface of the receptacle, regardless of the tolerances of the contact surface of the receptacle.

Ein gleichförmiger Spannvorgang lässt sich besonders gut dadurch realisieren, dass die Spannelemente identisch ausgebildet sind.A uniform clamping process can be implemented particularly well in that the clamping elements are of identical design.

Erfindungsgemäß sind die Spannelemente an Schwenklagerungen gelagert.According to the invention, the clamping elements are mounted on pivot bearings.

Dabei weist jedes Spannelement an seinem vorderen Ende eine Spitze auf, welche in der Spannstellung des Spannelements gegen die Kontaktfläche der Aufnahme geführt ist.Each tensioning element has a tip at its front end which, in the tensioning position of the tensioning element, is guided against the contact surface of the receptacle.

Damit lässt sich ein besonders exakt und reproduzierbares Spannen des Rohteils durchführen, da die Schwenkbewegungen der Spannelemente eine definierte Bewegung der Spitzen der einzelnen Spannelemente gegen die Kontaktfläche ermöglichen, wodurch auf einfache Weise ein sicheres Verspannen an der Kontaktfläche bewirkt wird.This enables the raw part to be clamped in a particularly precise and reproducible manner, since the pivoting movements of the clamping elements enable a defined movement of the tips of the individual clamping elements against the contact surface, which in a simple manner causes a secure clamping on the contact surface.

Gemäß einer geometrisch günstigen Ausgestaltung ist das Verstellelement in dessen Längsrichtung verschiebbar.According to a geometrically favorable embodiment, the adjusting element can be displaced in its longitudinal direction.

Weiterhin sind die Achsen der Schwenklagerung der Spannelemente senkrecht zur Längsachse des Verstellelements orientiert.Furthermore, the axes of the pivot mounting of the clamping elements are oriented perpendicular to the longitudinal axis of the adjusting element.

Die Linearbewegung des Verstellelements wird somit in die Schwenkbewegung der Spannelemente umgelenkt. Diese Umsetzung erfolgt über das kugelförmige Ausgleichselement, das auf der Auflagefläche beweglich ist.The linear movement of the adjusting element is thus deflected into the pivoting movement of the clamping elements. This implementation takes place via the spherical compensation element, which is movable on the support surface.

Vorteilhaft ist die Auflagefläche von einer Stirnseite des Verstellelements gebildet.The support surface is advantageously formed by an end face of the adjusting element.

Zweckmäßig ist die Auflagefläche eine ebene Fläche und der Durchmesser der Auflagefläche ist an den Durchmesser des kugelförmigen Ausgleichselements angepasst.The bearing surface is expediently a flat surface and the diameter of the bearing surface is adapted to the diameter of the spherical compensating element.

Besonders vorteilhaft sind die Schwenkbewegungen der Spannelemente und die Geometrien der Spitzen der Spannelemente so angepasst und optimiert, dass das gespannte Rohteil an einer Anlagefläche anliegt, und dass durch die in einzelne Spannstellungen eingefahrenen Spannelemente eine Kraft auf das Werkstück in Richtung der Anlagefläche ausgeübt ist.The pivoting movements of the clamping elements and the geometries of the tips of the clamping elements are particularly advantageously adapted and optimized so that the clamped blank lies against a contact surface and that the clamping elements moved into individual clamping positions exert a force on the workpiece in the direction of the contact surface.

Dadurch wird der Halt des Rohteils an der jeweiligen Unterlage noch weiter verbessert.This improves the hold of the blank on the respective base even further.

Gemäß einer ersten Variante der Erfindung ist die Aufnahme von einer an einer Seitenwand ausmündenden Ausnehmung des Werkstücks gebildet, wobei das die Ausnehmung begrenzende Wandersegment des Werkstücks die Kontaktfläche bildet.According to a first variant of the invention, the receptacle is formed by a recess of the workpiece that opens out on a side wall, the traveling segment of the workpiece delimiting the recess forming the contact surface.

Vorteilhaft weist die Ausnehmung einen kreisförmigen Querschnitt auf, das heißt die Aufnahme ist hohlzylindrisch ausgebildet.The recess advantageously has a circular cross section, that is to say the receptacle is designed as a hollow cylinder.

In diesem Fall werden die Spannelemente in den Hohlraum der Aufnahme von innen eingeführt, wobei dann die Spannelemente mit ihren Spitzen nach außen geschwenkt werden und so gegen die Kontaktfläche der Aufnahme geführt werden.In this case, the clamping elements are introduced into the cavity of the receptacle from the inside, the tips of the clamping elements then being pivoted outward and thus being guided against the contact surface of the receptacle.

In diesem Fall können die Spannelemente über das kugelförmige Ausgleichselement direkt an das Verstellelement angekoppelt sein.In this case, the tensioning elements can be coupled directly to the adjusting element via the spherical compensating element.

Vorteilhaft sind die Außenkonturen der Spannelemente so an das kugelförmige Ausgleichselement angepasst, dass durch den Kontakt der Spannelemente mit dem kugelförmigen Ausgleichselement die Spannelemente bei Bewegen des Verstellelements in die Spannposition in ihre Spannstellung überführt sind.The outer contours of the clamping elements are advantageously adapted to the spherical compensating element so that the contact of the clamping elements with the spherical compensating element, the clamping elements are transferred to their clamping position when the adjusting element is moved into the clamping position.

Damit wird ein besonders einfacher Mechanismus der Betätigung der Spannelemente bereitgestellt.This provides a particularly simple mechanism for actuating the tensioning elements.

Gemäß einer zweiten Variante der Erfindung ist die Aufnahme von einem von einer Seitenwand des Werkstücks hervorstehenden Zapfen gebildet, wobei die Mantelfläche des Zapfens die Kontaktfläche bildet.According to a second variant of the invention, the receptacle is formed by a pin protruding from a side wall of the workpiece, the jacket surface of the pin forming the contact surface.

Vorteilhaft weist der Zapfen einen kreisförmigen Querschnitt auf, das heißt der Zapfen weist eine zylindrische Form auf.The pin advantageously has a circular cross section, that is to say the pin has a cylindrical shape.

In diesem Fall müssen die Spannelemente von außen an den die Aufnahme bildenden Zapfen herangeführt werden.In this case, the clamping elements must be brought up to the pin forming the receptacle from the outside.

In diesem Fall ist jedes Spannelement über ein Umlenkelement an das kugelförmige Ausgleichselement angekoppelt.In this case, each tensioning element is coupled to the spherical compensating element via a deflecting element.

Zweckmäßig sind die Außenkonturen der Umlenkelemente so an das kugelförmige Ausgleichselement angepasst, dass durch den Kontakt des kugelförmigen Ausgleichselements mit dem Umlenkelement eine Umlenkbewegung bewirkt ist, mit der die an die Umlenkelemente gekoppelten Spannelemente bei Bewegen des Verstellelements in die Spannposition in ihre Spannstellung überführt sind.The outer contours of the deflecting elements are appropriately adapted to the spherical compensating element in such a way that the contact of the spherical compensating element with the deflecting element causes a deflection movement with which the clamping elements coupled to the deflecting elements are transferred to their clamping position when the adjusting element is moved into the clamping position.

Mit den Umlenkelementen erfolgt somit auf einfache Weise eine Umsetzung der Linearbewegung des Verstellelements in Schwenkbewegungen der Spannelemente, sodass diese von außen gegen die Mantelfläche des Zapfens geführt sind.With the deflection elements, the linear movement of the adjusting element is thus easily converted into pivoting movements of the clamping elements, so that these are guided from the outside against the lateral surface of the pin.

Gemäß einer vorteilhaften Ausgestaltung sind bei Bewegen des Verstellelements aus der Spannposition in eine Löseposition die Spannelemente durch eine Zwangsführung der Spannelemente am Verstellelement und durch von Federelementen ausgeübten Rückstellkräften in ihre Lösestellung überführt.According to an advantageous embodiment, when the adjusting element is moved from the clamping position into a release position, the clamping elements are transferred into their release position by forced guidance of the clamping elements on the adjusting element and by restoring forces exerted by spring elements.

Die Erfindung wird im Folgenden anhand der Zeichnungen erläutert. Es zeigen:

Figur 1:
Spanneinheit zum Spannen eines Rohteils gemäß dem Stand der Technik.
Figur 2:
Schnittdarstellung eines ersten Ausführungsbeispiels der erfindungsgemäßen Spanneinheit mit zwei Spannsystemen.
Figur 3:
Draufsicht auf die Spanneinheit gemäß Figur 2.
Figur 4:
Detaildarstellung eines Spannsystems gemäß Figur 2 im gelösten Zustand.
Figur 5:
Detaildarstellung eines Spannsystems gemäß Figur 2 im gespannten Zustand.
Figur 6:
Schnittdarstellung eines zweiten Ausführungsbeispiels der erfindungsgemäßen Spanneinheit mit zwei Spannsystemen.
Figur 7:
Draufsicht auf die Spanneinheit gemäß Figur 2.
Figur 8:
Detaildarstellung eines Spannsystems gemäß Figur 6 im gelösten Zustand.
Figur 9:
Detaildarstellung eines Spannsystems gemäß Figur 6 im gespannten Zustand.
The invention is explained below with reference to the drawings. Show it:
Figure 1:
Clamping unit for clamping a blank according to the prior art.
Figure 2:
Sectional view of a first exemplary embodiment of the clamping unit according to the invention with two clamping systems.
Figure 3:
Top view of the clamping unit according to Figure 2 .
Figure 4:
Detailed representation of a clamping system according to Figure 2 in the dissolved state.
Figure 5:
Detailed representation of a clamping system according to Figure 2 when tensioned.
Figure 6:
Sectional view of a second exemplary embodiment of the clamping unit according to the invention with two clamping systems.
Figure 7:
Top view of the clamping unit according to Figure 2 .
Figure 8:
Detailed representation of a clamping system according to Figure 6 in the dissolved state.
Figure 9:
Detailed representation of a clamping system according to Figure 6 when tensioned.

Die Figuren 2 - 6 zeigen ein erstes Ausführungsbeispiel einer Spanneinheit 1 zum Spannen eines Rohteils, welches im vorliegenden Fall von einem Gussteil 2 gebildet ist. Das mit der Spanneinheit 1 gespannte Rohteil kann in geeigneter Weise bearbeitet werden.the Figures 2 - 6 show a first exemplary embodiment of a clamping unit 1 for clamping a blank, which in the present case is formed by a cast part 2. The blank clamped with the clamping unit 1 can be processed in a suitable manner.

Die erfindungsgemäße Spanneinheit 1 weist zwei im Wesentlichen identisch ausgebildete Spannsysteme 5 auf. Je nach Ausbildung des zu spannenden Gussteils 2 können auch mehr als zwei Spannsysteme 5 oder nur ein Spannsystem 5 vorgesehen sein.The clamping unit 1 according to the invention has two essentially identically designed clamping systems 5. Depending on the design of the cast part 2 to be clamped, more than two clamping systems 5 or only one clamping system 5 can be provided.

Mit den Spannsystemen 5 erfolgt ein Spannen des Gussteils 2, wobei hierzu Aufnahmen an der Unterseite des Gussteils 2 vorgesehen sind. Die Spannsysteme 5 selbst sind auf einer nicht dargestellten Unterlage wie z.B. einer Spannplatte 3 befestigt. Jedes Spannsystem 5 sitzt dabei, mit Schrauben 6 befestigt, auf einem Sockel 5a auf. Durch unterschiedliche Sockel 5a oder ähnliche Ausgleichssegmente kann ein Höhenausgleich zur Anpassung an die Kontur der Unterseite des Gussteils 2 erfolgen.The cast part 2 is clamped with the clamping systems 5, with receptacles being provided on the underside of the cast part 2 for this purpose. The clamping systems 5 themselves are fastened to a base, not shown, such as a clamping plate 3. Each clamping system 5 sits on a base 5a, fastened with screws 6. A height compensation for adaptation to the contour of the underside of the cast part 2 can take place by means of different bases 5a or similar compensation segments.

Jedes Spannsystem 5 weist ein Oberteil 7 und ein Unterteil 8 auf, welche mit weiteren Schrauben 9 aneinander fixiert sind.Each clamping system 5 has an upper part 7 and a lower part 8, which are fixed to one another with further screws 9.

Zur Durchführung von Spannvorgängen weist jedes Spannsystem 5 ein Verstellelement 10 auf, das mittels einer nicht dargestellten Pneumatikeinheit in seiner Längsrichtung verschoben werden kann. Zum Anschluss an die Pneumatikeinheit sind entsprechende Pneumatikanschlüsse 11 vorgesehen. Das Verstellelement 10 ist von einem langgestreckten, im Wesentlichen zylindrischen Teil gebildet, wobei das Verstellelement 10 entlang seiner Längsachse verschoben gelagert ist.To carry out clamping processes, each clamping system 5 has an adjusting element 10 which can be displaced in its longitudinal direction by means of a pneumatic unit (not shown). Corresponding pneumatic connections 11 are provided for connection to the pneumatic unit. The adjusting element 10 is formed by an elongated, essentially cylindrical part, the adjusting element 10 being mounted displaced along its longitudinal axis.

Die obere Stirnseite 10a des Verstellelements 10 bildet eine ebene Auflagefläche. Auf dieser Auflagefläche ist ein kugelförmiges Ausgleichselement 12 beweglich gelagert. Das kugelförmige Ausgleichselement 12 besteht aus einer massiven Kugel, deren Durchmesser an den Durchmesser des Verstellelements 10 angepasst ist.The upper end face 10a of the adjustment element 10 forms a flat support surface. A spherical compensating element 12 is movably mounted on this support surface. The spherical compensating element 12 consists of a solid ball, the diameter of which is adapted to the diameter of the adjusting element 10.

Dem Verstellelement 10 und dem kugelförmigen Ausgleichselement 12 sind drei identisch ausgebildete Spannelemente 13 zugeordnet. An gegenüberliegenden Seitenflächen jedes Spannelements 13 münden zylindrische Wellensegmente 14 aus, die eine Schwenkachse bilden, an welche das Spannelement 13 schwenkbar gelagert ist. Die Wellensegmente 14 der Spannelemente 13 sind jeweils in entsprechenden Drehlagerungen gelagert, die je zur Hälfte von einem Segment des Oberteils 7 und einem Segment des Unterteils 8 gebildet sind, wie aus den Figuren 4 und 5 ersichtlich. Die Schwenkachsen der Spannelemente 13 verlaufen senkrecht zur Längsachse des Verstellelements 10.The adjusting element 10 and the spherical compensating element 12 are assigned three identically designed clamping elements 13. On opposite side surfaces of each clamping element 13, cylindrical shaft segments 14 open out, which form a pivot axis on which the clamping element 13 is pivotably mounted. The shaft segments 14 of the clamping elements 13 are each mounted in corresponding rotary bearings, half of which are formed by a segment of the upper part 7 and a segment of the lower part 8, as from the Figures 4 and 5 evident. The pivot axes of the clamping elements 13 run perpendicular to the longitudinal axis of the adjusting element 10.

Am oberen Ende eines Spannelements 13 ist eine quer von dessen Grundkörper hervorstehende Spitze 13a vorgesehen. Die Spitze 13a dient zur Fixierung in der Aufnahme des Gussteils 2.At the upper end of a tensioning element 13, a tip 13a protruding transversely from its base body is provided. The tip 13a is used to fix it in the receptacle of the cast part 2.

Bei der Ausführungsform der Figuren 2 - 5 bestehen die Aufnahmen aus Ausnehmungen 15, die an der Unterseite des Gussteils 2 ausmünden. Die Ausnehmungen 15 weisen einen kreisförmigen Querschnitt auf, der über die gesamte Höhe der jeweiligen Ausnehmung 15 konstant ist. Alternativ kann die Ausnehmung 15 auch leicht konisch ausgebildet sein. Auch ist es nicht zwingend, einen kreisförmigen Querschnitt vorzusehen. Die Ausnehmungen 15 werden von einer zylindrischen Grundfläche des Gussteils 2 begrenzt, welche eine Kontaktfläche 16 ausbilden.In the embodiment of Figures 2 - 5 the receptacles consist of recesses 15 which open out on the underside of the cast part 2. The recesses 15 have a circular cross section which is constant over the entire height of the respective recess 15. Alternatively, the recess 15 can also be designed to be slightly conical. It is also not essential to provide a circular cross-section. The recesses 15 are delimited by a cylindrical base surface of the cast part 2, which form a contact surface 16.

Wie insbesondere aus den Figuren 4 und 5 ersichtlich, sind die Unterseiten jedes Spannelements 13 auf einem Federelement 17 abgestützt, welches im Unterteil 8 gelagert ist.As in particular from the Figures 4 and 5 As can be seen, the undersides of each tensioning element 13 are supported on a spring element 17 which is mounted in the lower part 8.

Wie aus den Figuren 4 und 5 weiter ersichtlich, weist jedes Spannelement 13 an einer dem Verstellelement 10 zugewandten Seite eine Krümmung auf. Das Verstellelement 10 weist eine Einkerbung 10b auf, die einen Anschlag für den unteren Rand des jeweiligen Spannelements 13 bildet.As from the Figures 4 and 5 It can also be seen that each tensioning element 13 has a curvature on a side facing the adjusting element 10. The adjusting element 10 has a notch 10b which forms a stop for the lower edge of the respective tensioning element 13.

Zum Spannen des Gussteils 2 wird dieses auf die Spannsysteme 5 so aufgesetzt, dass das Oberteil 7 des jeweiligen Spannsystems 5 in die zugeordnete Ausnehmung 15 des Gussteils 2 ragt. Das Gussteil 2 liegt dann auf einer oberen Anlagefläche des jeweiligen Spannsystems 5 auf, wie insbesondere aus Figur 2 ersichtlich.To clamp the cast part 2, it is placed on the clamping systems 5 in such a way that the upper part 7 of the respective clamping system 5 protrudes into the associated recess 15 of the cast part 2. The cast part 2 then rests on an upper contact surface of the respective clamping system 5, in particular from Figure 2 evident.

Zur Durchführung des Spannvorgangs jedes Spannsystems 5 wird mittels der Pneumatikeinheit das Verstellelement 10 entlang seiner Längsrichtung aus seiner in Figur 4 dargestellten Löseposition in seine in Figur 5 dargestellte Spannposition eingefahren.In order to carry out the clamping process of each clamping system 5, the adjusting element 10 is moved out of its longitudinal direction by means of the pneumatic unit Figure 4 shown release position in its in Figure 5 shown clamping position retracted.

In der Löseposition des Verstellelements 10 sind die Spannelemente 13 durch die Rückstellkräfte der Federelemente 17 in ihre Lösestellung geschwenkt. In den Lösestellungen sind die Spannelemente 13 so in Richtung des Verstellelements 10 geschwenkt, dass deren Spitzen 13a nicht über die Seitenfläche des Oberteils 7 hervorstehen. In dieser Stellung der Spannelemente 13 kann das Oberteil 7 des Spannsystems 5 ohne weiteres in die Ausnehmung 15 eingeführt werden.In the release position of the adjusting element 10, the clamping elements 13 are pivoted into their release position by the restoring forces of the spring elements 17. In the release positions, the clamping elements 13 are pivoted in the direction of the adjusting element 10 in such a way that their tips 13a do not protrude beyond the side surface of the upper part 7. In this position of the clamping elements 13, the upper part 7 of the clamping system 5 can be easily inserted into the recess 15.

Je weiter das Verstellelement 10 an der Löseposition nach oben verfahren wird, desto mehr werden die Segmente der Spannelemente 13 mit den Spitzen 13a durch den Kontakt des kugelförmigen Ausgleichselements 12 nach außen geschwenkt, sodass die Spitzen 13a in Richtung der Kontaktfläche 16 geführt werden. Die Schwenkbewegungen der Spannelemente 13 sind dabei durch die Krümmungen der einzelnen Spannelemente 13 vorgegeben.The further the adjusting element 10 is moved upwards at the release position, the more the segments of the clamping elements 13 with the tips 13a are pivoted outward by the contact of the spherical compensating element 12, so that the tips 13a are guided in the direction of the contact surface 16. The pivoting movements of the clamping elements 13 are predetermined by the curvatures of the individual clamping elements 13.

Bei einer idealen zylindrischen Geometrie der Ausnehmung 15 kommen die Spitzen 13a aller Spannelemente 13 gleichzeitig in Kontakt mit der Kontaktfläche 16. Durch toleranzbedingte Abweichungen von dieser idealen Geometrie der Ausnehmung 15 wird typischerweise erst nur die Spitze 13a eines Spannelements 13 in Kontakt mit der Kontaktfläche 16 kommen. Diese toleranzbedingten Asymmetrien der Zuführung der Spitzen 13a der Spannelemente 13 werden durch eine Ausgleichsbewegung des kugelförmigen Ausgleichselements 12 ausgeglichen. Da das kugelförmige Ausgleichselement 12 freibeweglich auf der Auflagefläche des Verstellelements 10 gelagert ist und das kugelförmige Ausgleichselement 12 mit dem Spannelement 13 nur durch Anlage an den gekrümmten oder schräg verlaufenden Seitenflächen gekoppelt ist, kann das kugelförmige Ausgleichselement 12 in einer senkrecht zur Längsachse des Verstellelements 10 orientierten Ebene auf der Auflagefläche eine entsprechende Ausgleichsbewegung durchführen. Kommt dann ein Spannelement 13 mit einer Spitze 13a in Kontakt mit der Kontaktfläche 16, wird durch die dadurch ausgeübte Gegenkraft das kugelförmige Ausgleichselement 12 entgegengesetzt bewegt, wodurch die anderen Spannelemente 13 mit ihren Spitzen 13a verstärkt gegen die Kontaktfläche 16 geführt werden. Damit werden im Ergebnis die Spitzen 13a aller Spannelemente 13 gleichmäßig gegen die Kontaktfläche 16 geführt, sodass dadurch alle Spannelemente 13 etwa die gleichen Spannkräfte auf die Kontaktfläche 16 ausüben, wodurch ein reproduzierbarer Spannvorgang erhalten wird. Figur 5 zeigt das Spannelement 13 in seiner Spannstellung und das Verstellelement 10 in seiner Spannposition. In dieser Spannposition liegt der vordere Rand eines Spannelements 13 an dem von der Einkerbung 10b der Verstellelemente 10 gebildeten Anschlag an.With an ideal cylindrical geometry of the recess 15, the tips 13a of all clamping elements 13 come into contact with the contact surface 16 at the same time. Due to tolerance-related deviations from this ideal geometry of the recess 15, typically only the tip 13a of a clamping element 13 comes into contact with the contact surface 16 . These tolerance-related asymmetries of the feed of the tips 13a of the clamping elements 13 are compensated by a compensating movement of the spherical compensating element 12. Since the spherical compensating element 12 is freely movable on the support surface of the adjusting element 10 and the spherical compensating element 12 is only coupled to the tensioning element 13 by contacting the curved or inclined side surfaces, the spherical compensating element 12 can be oriented perpendicular to the longitudinal axis of the adjusting element 10 Carry out a corresponding compensation movement on the level on the support surface. If a clamping element 13 with a tip 13a then comes into contact with the contact surface 16, the counterforce exerted thereby moves the spherical compensating element 12 in the opposite direction, whereby the other clamping elements 13 with their tips 13a are increasingly guided against the contact surface 16. As a result, the tips 13a of all clamping elements 13 are uniformly guided against the contact surface 16, so that all clamping elements 13 exert approximately the same clamping forces on the contact surface 16, whereby a reproducible clamping process is obtained. Figure 5 shows the clamping element 13 in its clamping position and the adjusting element 10 in its clamping position. In this clamping position, the front edge of a clamping element 13 rests against the stop formed by the notch 10b of the adjusting elements 10.

Die Spitzen 13a der Spannelemente 13 sind dabei vorteilhaft derart ausgebildet, dass bei Anpressen der Spritzen der Kontaktfläche 16 eine Kraft nach unten und damit gegen die Anlagefläche des Spannsystems 5 ausgeübt wird, wodurch der Halt des Gussteils 2 vom Spannsystem 5 weiter verbessert wird.The tips 13a of the clamping elements 13 are advantageously designed in such a way that when the syringes of the contact surface 16 are pressed, a force is exerted downwards and thus against the contact surface of the clamping system 5, which further improves the hold of the cast part 2 by the clamping system 5.

Zum Lösen des Gussteils 2 wird das Verstellelement 10 mit der Pneumatikeinheit sicher in die Lösestellung verfahren, sodass sie Spitzen 13a der Spannelemente 13 durch die Rückstellkräfte der Federelemente 17 und auch durch eine Zwangsführung der Spannelemente 13 am Verstellelement 10 in das Oberteil 7 eingeschwenkt werden, bis die Spannelemente 13 in der in Figur 4 dargestellten Lösestellung liegen. Somit kann das Gussteil 2 von dem Spannsystem 5 gelöst werden.To release the cast part 2, the adjusting element 10 with the pneumatic unit is safely moved into the release position so that the tips 13a of the clamping elements 13 are pivoted into the upper part 7 by the restoring forces of the spring elements 17 and also by a forced guidance of the clamping elements 13 on the adjusting element 10, until the clamping elements 13 in the in Figure 4 shown release position. The cast part 2 can thus be released from the clamping system 5.

Die Figuren 6 - 9 zeigen ein zweites Ausführungsbeispiel der erfindungsgemäßen Spanneinheit 1. In diesem Fall bestehen die Aufnahmen des Gussteils 2 aus Zapfen 18, die von dessen Unterseite hervorstehen. Die Zapfen 18 weisen einen über ihre Höhe konstanten kreisförmigen Querschnitt auf. Generell sind auch andere Querschnittsformen möglich, wobei der Querschnitt generell auch über die Höhe nicht konstant sein muss. Die zylindrische äußere Mantelfläche eines Zapfens 18 bildet die Kontaktfläche 16.the Figures 6 - 9 show a second exemplary embodiment of the clamping unit 1 according to the invention. In this case, the receptacles of the cast part 2 consist of pegs 18 which protrude from its underside. The pins 18 have a circular cross section that is constant over their height. In general, other cross-sectional shapes are also possible, with the cross-section generally not having to be constant even over the height. The cylindrical outer jacket surface of a pin 18 forms the contact surface 16.

Die Zapfen 18 dienen als Aufnahmen nur zur Befestigung des Gussteils 2 und können nach erfolgter Bearbeitung des Gussteils 2 von diesem entfernt werden.The pins 18 serve as receptacles only for fastening the cast part 2 and can be removed therefrom after the cast part 2 has been processed.

Entsprechend des Unterschieds in der Ausbildung der Aufnahmen als Zapfen 18 im Vergleich zu Ausnehmungen 15 unterscheidet sich die Ausführungsform der Figuren 6 - 9 von der Ausführungsform der Figuren 2 - 5 durch die Umsetzung der Translationsbewegung des Verstellelements 10 in die Schwenkbewegungen der Spannelemente 13, die wiederum bezüglich der durch die Wellensegmente 14 definierten Schwenkachsen schwenkbar sind.According to the difference in the design of the receptacles as pins 18 compared to recesses 15, the embodiment of FIG Figures 6 - 9 from the embodiment of Figures 2 - 5 by converting the translational movement of the adjusting element 10 into the pivoting movements of the clamping elements 13, which in turn can be pivoted with respect to the pivot axes defined by the shaft segments 14.

Bei der Ausführungsform gemäß den Figuren 6 - 9 ist wiederum auf der eine ebene Auflagefläche bildenden vorderen Stirnseite 10a des Verstellelements 10 das kugelförmige Ausgleichselement 12 beweglich gelagert. Im Unterschied zu der Ausführungsform gemäß den Figuren 2 - 5 ist jedoch bei der Ausführungsform der Figuren 6 - 9 das Verstellelement 10 nicht über das kugelförmige Ausgleichselement 12 in Kontakt mit Umlenkelementen 19, wobei jeweils ein Umlenkelement 19 mit einem Spannelement 13 verbunden ist. Jedes Umlenkelement 19 ist im Unterteil 8 in horizontaler Richtung verschiebbar gelagert, das heißt die Umlenkelemente 19 können Translationsbewegungen senkrecht zur Längsachse des Verstellelements 10 durchführen.In the embodiment according to Figures 6 - 9 the spherical compensating element 12 is in turn movably supported on the front end face 10a of the adjusting element 10, which face forms a flat support surface. In contrast to the embodiment according to FIGS Figures 2 - 5 however, in the embodiment of Figures 6 - 9 the adjusting element 10 is not in contact with deflection elements 19 via the spherical compensating element 12, a deflection element 19 in each case being connected to a tensioning element 13. Each deflecting element 19 is mounted displaceably in the horizontal direction in the lower part 8, that is to say the deflecting elements 19 can perform translational movements perpendicular to the longitudinal axis of the adjusting element 10.

Das erste längsseitige Ende eines Umlenkelements 19 ist von einer Schrägfläche 19a begrenzt, welches am kugelförmigen Ausgleichselement 12 anliegt. Das andere längsseitige Ende liegt im Bereich unterhalb der Schwenkachse seitlich am Spannelement 13 an.The first longitudinal end of a deflecting element 19 is delimited by an inclined surface 19 a, which rests on the spherical compensating element 12. The other longitudinal end rests laterally on the clamping element 13 in the area below the pivot axis.

Der gekrümmte untere Rand jedes Spannelements 13 liegt an einem Kugelelement 20 an, welches auf dem die Rückstellkraft ausübenden Federelement 17 aufsitzt, wobei das Federelement 17 in einer Aussparung des Unterteils 8 zwangsgeführt ist.The curved lower edge of each tensioning element 13 rests against a ball element 20, which rests on the spring element 17 exerting the restoring force, the spring element 17 being positively guided in a recess in the lower part 8.

Figur 8 zeigt das Verstellelement 10 in seiner Löseposition, das heißt in seiner unteren Grenzposition. In dieser Löseposition ist das kugelförmige Ausgleichselement 12 soweit nach unten gefahren, dass es in dem unteren Bereich der Schrägfläche 19a der Umlenkelemente 19 anliegt. Dadurch sind die Spannelemente 13 in den Bereich des Oberteils 7 zurückgeschwenkt und dort mit den Rückstellkräften der Federelemente 17 gehalten. In diesen Lösestellungen der Spannelemente 13 kann der Zapfen 18 in dem Bereich des Oberteils 7 mit den Spannelementen 13 eingeführt werden, wobei dieser Bereich in Form einer Aussparung ausgebildet ist, die an der Oberseite des Oberteils 7 ausmündet. Der Durchmesser dieser Aussparung ist an den Außendurchmesser des Zapfens 18 angepasst, sodass der Zapfen 18 mit geringem Spiel in der Aussparung des Oberteils 7 liegt. Figure 8 shows the adjustment element 10 in its release position, that is, in its lower limit position. In this release position, the spherical compensating element 12 has moved down so far that it rests in the lower region of the inclined surface 19a of the deflecting elements 19. As a result, the clamping elements 13 are pivoted back into the area of the upper part 7 and held there by the restoring forces of the spring elements 17. In these release positions of the clamping elements 13, the pin 18 can be inserted into the area of the upper part 7 with the clamping elements 13, this area being designed in the form of a recess which opens out on the upper side of the upper part 7. The diameter of this recess is adapted to the outer diameter of the pin 18, so that the pin 18 lies in the recess of the upper part 7 with little play.

Zum Spannen des Gussteils 2 wird bei jedem Spannsystem 5 durch die Pneumatikeinheit das Verstellelement 10 aus der Löseposition in die Spannposition verfahren. Dadurch wird das kugelförmige Ausgleichselement 12 nach oben geschoben und gleitet entlang der Schrägflächen 19a der Umlenkelemente 19. Durch den vom Verstellelement 10 über das kugelförmige Ausgleichselement 12 ausgeübten Anpressdruck werden die Umlenkelemente 19 nach außen verfahren. Dadurch werden die Spannelemente 13 gegen die Rückstellkräfte der Federelemente 17 geschwenkt und die Spitzen 13a der Spannelemente 13 gegen die Kontaktfläche 16 des Zapfens 18 geführt. Diese Schwenkbewegung der Spannelemente 13 wird fortgesetzt, bis das Verstellelement 10 in seine Spannposition eingefahren ist und damit die Spannelemente 13 in ihre Spannstellung überführt sind, in welcher die Spitzen 13a der Spannelemente 13 mit Anpressdruck gegen die Kontaktfläche 16 des Zapfens 18 geführt sind und das Gussteil 2 fest gespannt ist (Figur 9).To clamp the cast part 2, in each clamping system 5, the pneumatic unit moves the adjusting element 10 from the release position into the clamping position. As a result, the spherical compensating element 12 is pushed upwards and slides along the inclined surfaces 19a of the deflecting elements 19. The contact pressure exerted by the adjusting element 10 via the spherical compensating element 12 moves the deflecting elements 19 outward. As a result, the clamping elements 13 are pivoted against the restoring forces of the spring elements 17 and the tips 13a of the clamping elements 13 are guided against the contact surface 16 of the pin 18. This pivoting movement of the Clamping elements 13 is continued until the adjusting element 10 has moved into its clamping position and thus the clamping elements 13 are transferred to their clamping position, in which the tips 13a of the clamping elements 13 are guided with contact pressure against the contact surface 16 of the pin 18 and the cast part 2 is firmly clamped is ( Figure 9 ).

In den Spannstellungen zeigen die Spitzen 13a der Spannelemente 13 wieder etwas nach unten, sodass durch den Spannvorgang das Gussteil 2 mit den jeweiligen Zapfen 18 in die Aussparung des Oberteils 7 des Spannsystems 5 hineingeführt wird, wodurch der Halt des Gussteils 2 am Spannsystem 5 weiter verbessert wird.In the clamping positions, the tips 13a of the clamping elements 13 point slightly downwards again, so that the cast part 2 with the respective pins 18 is guided into the recess of the upper part 7 of the clamping system 5 through the clamping process, which further improves the hold of the cast part 2 on the clamping system 5 will.

Zum Lösen des Zapfens 18 des Gussteils 2 aus dem Spannsystem 5 wird durch die Pneumatikeinheit das Verstellelement 10 wieder in die Lösestellung eingefahren, wodurch die Spannelemente 13 in ihre Lösestellung überführt sind und dort mit den Federelementen 17 gehalten werden (Figur 8). In dieser Lösestellung der Spannelemente 13 kann der Zapfen 18 des Gussteils 2 aus der Aussparung des Oberteils 7 des Spannsystems 5 herausgezogen werden.To release the pin 18 of the cast part 2 from the clamping system 5, the pneumatic unit moves the adjusting element 10 back into the release position, whereby the clamping elements 13 are transferred to their release position and are held there with the spring elements 17 ( Figure 8 ). In this release position of the clamping elements 13, the pin 18 of the cast part 2 can be pulled out of the recess in the upper part 7 of the clamping system 5.

BezugszeichenlisteList of reference symbols

(1)(1)
SpanneinheitClamping unit
(2)(2)
GussteilCasting
(3)(3)
SpannplatteClamping plate
(4)(4)
SpannvorrichtungJig
(5)(5)
SpannsystemClamping system
(5a)(5a)
Sockelbase
(6)(6)
Schraubescrew
(7)(7)
OberteilTop
(8)(8th)
UnterteilLower part
(9)(9)
Schraubescrew
(10)(10)
VerstellelementAdjustment element
(10a)(10a)
StirnseiteFront side
(10b)(10b)
Einkerbungnotch
(11)(11)
PneumatikanschlussPneumatic connection
(12)(12)
kugelförmiges Ausgleichselementspherical compensation element
(13)(13)
SpannelementClamping element
(13a)(13a)
Spitzetop
(14)(14)
WellensegmentShaft segment
(15)(15)
AusnehmungRecess
(16)(16)
KontaktflächeContact area
(17)(17)
FederelementSpring element
(18)(18)
ZapfenCones
(19)(19)
UmlenkelementDeflection element
(19a)(19a)
SchrägflächeSloping surface
(20)(20)
KugelelementSpherical element

Claims (14)

  1. Clamping system (5) for clamping an unmachined part, with an arrangement of at least three clamping elements (13), which are movable by means of an adjusting element (10) between a release setting and a clamping setting, wherein the clamping elements (13) in the release setting are out of engagement and in the clamping setting in engagement with a contact surface (16) of a seat of the unmachined part, wherein the clamping elements (13) are coupled to the adjusting element (10) by way of a spherical compensating element (12) and the spherical compensating element (12) is movably mounted on a support surface of the adjusting element (10) so that on movement of the adjusting element (10) into a clamping position the spherical compensating element (12) executes a compensating movement by which the clamping elements (13) are uniformly guided against the contact surface (16) of the seat, characterised in that the clamping elements (13) are mounted on pivot mountings.
  2. Clamping system (5) according to claim 1, characterised in that the clamping elements (13) are of identical construction.
  3. Clamping system (5) according to one of claims 1 and 2, characterised in that each clamping element (13) has at its front end a point (13a) which in the clamping setting of the clamping element (13) is guided against the contact surface (16) of the seat.
  4. Clamping system (5) according to any one of claims 1 to 3, characterised in that the support surface is formed by an end face (10a) of the adjusting element (10).
  5. Clamping system (5) according to claim 4, characterised in that the diameter of the support surface is adapted to the diameter of the spherical compensating element (12).
  6. Clamping system (5) according to any one of claims 1 to 5, characterised in that the adjusting element (10) is displaceable in the longitudinal direction thereof.
  7. Clamping system (5) according to claim 6, characterised in that axes of the pivot mounting of the clamping elements (13) are oriented perpendicularly to the longitudinal axis of the adjusting element (10).
  8. Clamping system (5) according to any one of claims 1 to 7, characterised in that the clamped unmachined part bears against a lay surface and that a force is exerted on the workpiece in the direction of the lay surface by the clamping elements (13) moved into their clamping setting.
  9. Clamping system (5) according to any one of claims 1 to 8, characterised in that the adjusting element (10) is driven pneumatically, mechanically, hydraulically or electrically.
  10. Clamping system (5) according to any one of claims 1 to 9, characterised in that on movement of the adjusting element (10) out of the clamping position into a release position the clamping elements (13) are transferred to the release setting thereof by constrained guidance of the clamping elements (13) at the adjusting element (10) and by restoring forces exerted by spring elements (17).
  11. Clamping system (5) according to any one of claims 1 to 10, characterised in that the seat is formed by a recess (15), which opens at a side wall, of the workpiece, wherein the wall segment, which bounds the recess (15), of the workpiece forms the contact surface (16).
  12. Clamping system (5) according to claim 11, characterised in that the clamping elements (13) are coupled directly to the adjusting element (10) by way of the spherical compensating element (12), wherein the outer contours of the clamping elements (13) are so adapted to the spherical compensating element (12) that through contact of the clamping elements (13) with the spherical compensating element (12) the clamping elements (13) are transferred to the clamping setting thereof on movement of the adjusting element (10) into the clamping position.
  13. Clamping system (5) according to any one of claims 1 to 10, characterised in that the seat is formed by a pin (18) projecting from a side wall of the workpiece, wherein the circumferential surface of the pin (18) forms the contact surface (16).
  14. Clamping system (5) according to claim 13, characterised in that each of the clamping elements (13) is coupled to the spherical compensating element (12) by way of a deflecting element (19), wherein the outer contours of the deflecting elements (19) are so adapted to the spherical compensating element (12) that through contact of the spherical compensating element (12) with the deflecting element (19) a deflecting movement is produced by which the clamping elements (13) coupled to the deflecting elements (19) are transferred to the clamping setting thereof on movement of the adjusting element (10) into the clamping position.
EP18172783.5A 2017-06-08 2018-05-17 Tensioning system Active EP3412411B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017112664.3A DE102017112664B4 (en) 2017-06-08 2017-06-08 Clamping system with at least three clamping elements

Publications (2)

Publication Number Publication Date
EP3412411A1 EP3412411A1 (en) 2018-12-12
EP3412411B1 true EP3412411B1 (en) 2021-09-22

Family

ID=62200277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18172783.5A Active EP3412411B1 (en) 2017-06-08 2018-05-17 Tensioning system

Country Status (2)

Country Link
EP (1) EP3412411B1 (en)
DE (1) DE102017112664B4 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1567251A (en) 1976-08-24 1980-05-14 Kennametal Inc Connection arrangements for tool holders
JPH01170532A (en) * 1987-12-25 1989-07-05 Kosumetsuku:Kk Cylinder type hydraulic clamp
US5746436A (en) 1995-07-12 1998-05-05 Coburn Optical Industries, Inc. Air pressurized chuck
JP3954704B2 (en) * 1997-10-31 2007-08-08 株式会社コスメック Clamping device
DE10338850B4 (en) 2002-08-21 2014-01-02 Klingelnberg Gmbh mandrel
DE102008022826A1 (en) 2008-05-07 2009-11-12 Röhm Gmbh clamping head
JP5892897B2 (en) * 2012-07-31 2016-03-23 株式会社コスメック Clamping device
DE202016001906U1 (en) 2016-03-22 2016-05-09 Christof Steubing Down effect-Centering

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EP3412411A1 (en) 2018-12-12
DE102017112664B4 (en) 2021-12-16
DE102017112664A1 (en) 2018-12-13

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