EP4272887B1 - Tool unit for a cold rolling machine - Google Patents

Description

The invention relates to a tool unit for a cold rolling machine. The cold rolling machine is designed to cold-form a cylindrical workpiece in order to produce a profile, for example a toothing or a thread, on its outside. The toothing can be aligned parallel (straight toothing) or obliquely (helical toothing) to the axis of the cylindrical workpiece. In the axial direction of the workpiece, the profile can be produced at least along a section.

The cold rolling machine has two tool units, each with one or more rolling rods. Each rolling rod has a rolling profile that corresponds to the profile to be produced on the workpiece. The two rolling rods of the tool units are pressed against the workpiece from opposite sides in a working direction and moved in opposite directions at right angles to the working direction in a longitudinal direction in which the rolling rods extend. This causes the workpiece to roll around its axis between the two rolling rods and be formed. The resulting profile can extend completely into the workpiece in the circumferential direction.

Cold rolling machines and methods for producing such a profile are known, for example from EP 1 286 794 B1 or EP 3 807 023 B1 . EN 102 12 256 A1 shows a tool unit for a cold rolling machine, having a tool carriage which is arranged to be linearly movable in the longitudinal direction, a carrier arranged on the tool carriage which is designed to arrange a rolling rod such that a rolling profile of the rolling rod is aligned in a working direction perpendicular to the longitudinal direction, an adjusting device arranged on the tool carriage which is designed to move the carrier in the working direction relative to the tool carriage, a clamping device arranged on the tool carriage which has at least one clamping body, wherein the clamping device is designed to urge the rolling rod against the carrier in the working direction by means of the at least one clamping body.

To machine workpieces of different diameters In order to be able to do this, there are cold rolling machines in which the tool slides of the tool units on which the rolling rods are mounted can be moved towards or away from each other and positioned in the working direction by means of a machine axis. However, there are also cold rolling machines of a simpler design in which such a machine axis is missing and the tool slides are a predetermined distance apart in the working direction. In such cold rolling machines, the position of the rolling rod in the working direction must be changed in an at least partially manual process. The rolling rod is usually attached directly or indirectly to the tool slide by screw connections in order to support the forming forces and prevent the rolling rod from moving undesirably. This clamp must be released manually. The position of the rolling rod in the working direction can then be changed and adjusted as required using an adjustment device. The mechanical fastening of the rolling rod, usually a screw connection, is then restored and the position of the rolling rod in the tool unit is thereby fixed.

Based on the prior art, it is an object of the present invention to provide a tool unit for a cold rolling machine in which the forces acting on the rolling rod are well supported during the production of a profile in a workpiece and at the same time a simple adjustment of a profile distance between rolling rods of two tool units is possible.

This object is achieved by a tool unit according to patent claim 1.

The tool unit according to the invention is designed and intended for use in a cold rolling machine. A cold rolling machine can have at least one and preferably two tool units according to the invention. More than two tool units according to the invention can also be used in a cold rolling machine. This makes it possible, for example, to use more than one rolling rod per carriage in the cold rolling machine.

The tool unit has a tool carriage arranged to be linearly movable in a longitudinal direction. A carrier is arranged on the tool carriage. The carrier is designed to carry the rolling rod and to support forces acting on the rolling rod in a working direction perpendicular to the longitudinal direction, which forces occur in particular during forming. For this purpose, the carrier can have a contact surface aligned in the working direction, on which the rolling rod can be arranged. In the position of use, when the rolling rod is arranged on the carrier, the rolling profile points in the working direction. In the cold rolling machine, two rolling rods are arranged with a profile distance from one another in the working direction, the rolling profiles of which face one another and the workpiece. A workpiece can be formed between the two rolling rods to produce a profile on the outer circumference.

The tool unit according to the invention also has an adjustment device which is arranged on the tool carriage. The adjustment device has an adjustment motor. The adjustment motor is preferably an electric motor. The adjustment motor can be connected to the carrier via a gear, preferably a wedge-face gear. The adjustment device is designed to move the carrier relative to the tool carriage in the working direction and to bring it into a desired position. In this way, a profile distance between two rolling bars of different tool units in a cold rolling machine can be changed and adjusted.

The tool unit according to the invention also has a clamping device which is arranged - preferably directly - on the tool carriage. The clamping device has at least one clamping body which generates a clamping force on the rolling rod in the working direction. The rolling rod is pressed against the carrier by the clamping force and is thereby held. The clamping body is mounted so that it can move in the working direction against the clamping force. The clamping body can generate the clamping force as a tensile force or a compressive force.

The adjustment device is designed to move the carrier and the rolling rod together against the clamping force in the working direction in order to set the desired position of the rolling rod in the working direction.

The clamping device ensures that the rolling rod is held securely. However, the movable mounting of the clamping body makes it possible to move the carrier against the clamping force using the adjustment device and to enable automated positioning of the rolling rod.

In one embodiment, the tool carriage of the tool unit is not automated in the working direction by a machine axis or other device movable or positionable. It can be arranged immobile in the working direction.

The tool carriage of the tool unit is arranged to be linearly movable in the longitudinal direction. The rolling rod extends in the longitudinal direction and is moved in the longitudinal direction by means of the tool carriage when the workpiece is formed. The clamping device is preferably designed to support the rolling rod in the longitudinal direction on the tool carriage in order to avoid an undesirable relative movement between the rolling rod and the tool carriage in the longitudinal direction.

It is preferred if the clamping device has two clamping units arranged at a distance from one another in the longitudinal direction. The rolling rod can be arranged on the carrier in the space between the two clamping units.

It is advantageous if at least one of the clamping units has a fixed stop surface for the rolling rod. The fixed stop surface is arranged immovably in the longitudinal direction relative to the tool slide. The fixed stop surface is arranged in particular not on the at least one clamping body, but on another component of the at least one clamping unit, for example on a base body. A force acting on the rolling rod in the longitudinal direction can be introduced via the fixed stop surface into the clamping unit and via the clamping unit into the tool slide and supported in this way. The carrier is preferably arranged outside the force flow that supports the rolling rod in the longitudinal direction. A force acting in the longitudinal direction The force acting on the workpiece is therefore not supported by the carrier or is only supported to a negligible extent. This simplifies the design of the adjustment device, as the carrier can be moved in the longitudinal direction by the adjustment device. The adjustment device therefore does not have to absorb large forces in the longitudinal direction that occur when the workpiece is formed.

It is also advantageous if at least one of the clamping units and in particular the clamping unit which does not have a fixed stop surface has a positionable stop surface for the rolling rod which can be positioned in the longitudinal direction relative to the tool carriage. The positionable stop surface is preferably arranged on the clamping body. Alternatively, the positionable stop surface can also be arranged on another component of the clamping unit, for example on a separate stop body which is arranged on a base body of the clamping unit so that it can be positioned in the longitudinal direction. By using the clamping body as a positionable stop surface, a particularly compact and simple structure can be achieved.

It is advantageous if each clamping unit has a base body that is arranged on the tool slide. The base body can be fixed to the tool slide by a screw connection or another mechanical connection when the tool unit in the cold rolling machine is in the operational state. This defines, for example, the position of a fixed stop surface on the base body relative to the tool slide. It may be possible to attach the base body to the tool slide in different positions. However, the position of the base body cannot be changed relative to the tool slide by motor or other automated means. After the tool unit has been set up for operation, the relative position between the base body and the tool slide is preferably unchangeable.

In one embodiment, the adjustment motor of the adjustment device can be arranged on the base body of one of the two clamping units.

It is preferred if each clamping unit of the clamping device has at least one clamping body and in particular exactly one clamping body.

At least the clamping body that has the positionable stop surface can be mounted on the base body of the relevant clamping unit so that it can be positioned in the longitudinal direction. It is sufficient if at least one clamping body of one of the two clamping units can be positioned in the longitudinal direction. However, all clamping bodies of the clamping units can also be mounted on the base body of the relevant clamping unit so that they can be positioned in the longitudinal direction.

The at least one clamping body of the clamping device can be mounted so as to be pivotable about a pivot axis. The pivot axis preferably extends obliquely or at a right angle to the working direction. In a preferred embodiment, the pivot axis extends in a transverse direction, the transverse direction being aligned at a right angle to the working direction and at a right angle to the longitudinal direction.

For pivot mounting, the clamping body can be arranged on a shaft in a rotationally fixed manner. The shaft extends along the pivot axis, for example in the transverse direction. The shaft is rotatably mounted on the base body of the respective clamping unit. If the clamping body is arranged on the base body so that it can be positioned in the longitudinal direction, the shaft can be mounted so that it can move or position itself in the longitudinal direction relative to the base body. For example, the shaft can be mounted within an elongated recess on the base body. The shaft can be positioned in the longitudinal direction within the elongated recess. The position can be adjusted, for example, using at least one threaded bolt.

In a preferred embodiment, the at least one clamping body is implemented by a two-armed lever. In this embodiment, the clamping body has two arms extending in different directions away from the pivot axis. The two arms can extend away from each other in diametrically opposite directions. The length of the arms from the pivot axis to the free end of the respective arm is preferably different. In one embodiment, the two-armed lever can be a straight lever that is mounted off-center so that it can pivot around the pivot axis.

The first arm of the lever can be designed to rest against the rolling rod. The other, second arm of the lever can be designed to generate a clamping force via at least one clamping element. For this purpose, the second arm can be supported on the tool carriage via the at least one clamping element via the clamping unit. Preferably, the at least one clamping element can be a base body of the clamping unit.

In a preferred embodiment, the second arm is longer than the first arm, in particular at least by a factor of 2 or 3.

In one embodiment, the carrier can be connected to the adjustment motor via a wedge-face gear. For this purpose, the carrier can have a base surface that is inclined in the longitudinal direction. The base surface can be supported on a support surface of a support body that is inclined in the longitudinal direction. The adjustment device is designed to move the carrier and the support body in the longitudinal direction relative to one another. Due to the inclined inclination, the position of the carrier in the working direction relative to the tool carriage also changes.

The base surface and/or the support surface can be a continuous surface extending in a common plane or can be formed by surface sections arranged in a common plane but not connected to one another in this plane.

The adjustment device can, for example, have a spindle arrangement with which the adjustment motor is coupled to the carrier. For example, the spindle can be drive-connected to a motor shaft of the adjustment motor and can engage with a spindle nut that is arranged on the carrier in a rotationally fixed manner. It is also possible to connect the spindle nut to the motor shaft and arrange the spindle on the carrier in a rotationally fixed manner.

In one embodiment, a choice can be made between the There must be a coupling element between the motor shaft of the adjustment motor and the spindle that allows a bending angle between the axis of the motor shaft and the axis of the spindle. The coupling element can be a universal joint, for example.

In order to avoid or limit a bending angle between the motor shaft of the adjustment motor and the spindle, the base body can preferably have a fastening surface which is not aligned at a right angle to the longitudinal direction and to which the adjustment motor is fastened, so that the motor shaft extends substantially parallel to the spindle.

Advantageous embodiments of the tool unit emerge from the dependent claims, the description and the drawing. Preferred embodiments of the invention are explained in detail below with reference to the accompanying drawings. In the drawings:

Figure 1 a block diagram of two tool units of a cold rolling machine according to the invention,

Figure 2 a side view of an embodiment of a tool unit with a clamping device for holding a rolling rod on the tool slide,

Figure 3 a side view of a first clamping unit of the clamping device from Figure 2 ,

Figure 4 a side view of a partial representation of a second clamping unit of the clamping device from figure 2 ,

Figure 5 a modified embodiment of the first clamping unit of the clamping device from Figure 2 in a partial representation in side view,

Figure 6 a schematic representation of an embodiment of the tool unit in a cross section and

Figure 7 a side view of an embodiment of the tool unit.

In Figure 1 Two tool units 10 of a cold rolling machine 11 are shown in a highly schematic manner in the form of a block diagram. The two tool units 10 are, for example, constructed identically, so that it is sufficient to describe one of the two tool units 10. In an alternative embodiment of the cold rolling machine 11, it may also be sufficient to provide only one tool unit 10 designed according to the invention, wherein the other tool unit can optionally also be designed in any embodiment according to the prior art.

The tool unit 10 according to the present invention has a tool carriage 12 that can be moved linearly in a longitudinal direction X. The tool carriage 12 can be moved in the longitudinal direction X with a machine axis (not shown) of the cold rolling machine 11.

A support body 13 is attached to the tool carriage 12. The support body 13 has a support surface 14, on which a carrier 15 with a base surface 16 is supported. Both the support surface 14 and the base surface 16 extend parallel to a transverse direction Y, which is aligned at right angles to the longitudinal direction X. The longitudinal direction X, the transverse direction Y and a working direction Z form a Cartesian coordinate system in the exemplary embodiment, which is fixed to a machine frame or a machine base of the cold rolling machine 11. Both the support surface 14 and the base surface 16 are inclined at an angle relative to the longitudinal direction X. In the exemplary embodiment, the support surface 14 and the base surface 16 lie against one another in a plane which encloses an angle of inclination α with the longitudinal direction X. The angle of inclination α is less than 15°, preferably less than 10° and in the exemplary embodiment less than 5° ( Figures 2 and 7 ).

The carrier 15 is mounted on the tool carriage so that it can move in the longitudinal direction X relative to the support body 13. The bearing between the carrier 15 and the support body 13 is preferably formed by a sliding bearing. In the exemplary embodiment, the support surface 14 and the base surface 16 lie flat against one another in the common plane.

On its side facing away from the base surface 16, the carrier 15 has a contact surface 17. A rolling rod 18 of the tool unit 10 can be placed on the contact surface 17. The rolling rod 18 is held on the tool slide 12 by means of a clamping device 19 and in particular secured against undesirable relative movements with respect to the tool slide 12. In the exemplary embodiment, the clamping device 19 is designed to enable an adjustment or setting movement of the carrier 15 and thus also of the rolling rod 18 arranged thereon in the working direction Z relative to to the tool slide 12 and to block a relative movement in the longitudinal direction X.

The rolling rod 18 is a tool for forming a workpiece 20 ( Figure 1 ). By means of the cold rolling machine 11, a profile, for example a straight toothing, a helical toothing or a thread, can be produced in an axial section of a cylindrical workpiece 20. The profile produced is defined by a rolled profile 21 of the rolled rod 18. The rolled profile 21 is not shown in detail in the drawing and is formed by teeth arranged at a distance in the longitudinal direction, with a tooth gap being present between two immediately adjacent teeth. The rolled profile 21 is present on the side of the rolled rod 18 facing the workpiece 20 and thus on the side of the rolled rod 18 facing away from the carrier 15.

During the forming process, the rolling profiles 21 of the rolling rods 18 of the two tool units 10 of the cold rolling machine 11 come into engagement with the workpiece 20. The tool slides 12 of the two tool units 10 are moved in the longitudinal direction X opposite to each other or in opposite directions, as indicated by the block arrows in Figure 1 is shown schematically. Due to the engagement with the rolling profiles 21, the workpiece 20 rolls on the two rolling rods 18, while a profile is produced on its outer circumference by cold forming.

In order to be able to adjust the distance between the two rolling rods 18 or the two rolling profiles 21 in the cold rolling machine 11, the tool unit 10 has an adjusting device 25. The adjusting device 25 has an adjustment motor 26 which is drive-connected to the carrier 15. The adjustment motor 26 is preferably an electric motor.

The adjustment device 25 is designed to adjust the position of the carrier 15 in the working direction Z relative to the tool carriage 12. For this purpose, the carrier 15 can be moved by means of the adjustment motor 26 in such a way that the position of its contact surface 17 and thus the position of a rolling rod 18 arranged on the contact surface 17 changes in the working direction Z. In the exemplary embodiment, the adjustment motor 26 is designed to move the carrier 15 in the longitudinal direction X relative to the support body 13. Due to the angle of inclination α of the base surface 16 of the carrier 15 and the support surface 14 of the support body 13, this relative movement in the longitudinal direction X also causes a displacement of the carrier 15 in the working direction Z relative to the tool carriage 12. As a result, the position of the rolling rod 18 in the working direction Z relative to the tool carriage 12 of the tool unit 10 can be changed and adjusted.

The drive connection between the adjustment motor 26 and the carrier 15 is preferably self-locking and in the embodiment is implemented by a spindle arrangement 27. Forces that are introduced into the carrier 15 via the rolling rod 18 during the forming of the workpiece 20 in the working direction Z do not then have to be supported by the adjustment motor 26. After adjusting the position of the rolling rod 18 in the working direction Z, the adjustment motor 26 therefore does not have to apply any torque.

The spindle arrangement 27 has in the embodiment a spindle 29 which is drive-connected to a motor shaft 28 of the adjustment motor 26. The spindle 29 is in threaded engagement with a spindle nut 30 which, in the embodiment, is arranged on the carrier 15 in a rotationally fixed manner, for example in a recess in the carrier 15 into which the spindle 29 can protrude. If the spindle 29 is driven, the nut 30 moves along the spindle 29, which can cause the carrier 15 to move in the longitudinal direction X. Since the carrier 15 also moves in the working direction Z relative to the tool slide 12, a coupling element 31 is arranged in the drive connection between the spindle 29 and the motor shaft 28, via which a non-aligned alignment between the motor shaft 28 and the spindle 29 is permitted. The coupling element 31 is formed in the embodiment by a coupling 32 ( Figures 2 , 3 and 7 ).

The surface of the base body 39 to which the electric motor is attached is, for example, aligned at an angle oblique to the longitudinal direction L, so that essentially no bending angle is created between the motor shaft 28 and the spindle 29.

Alternatively, the angled surface of the base body can be dispensed with by inserting a cardanic coupling 32 between the spindle 29 and the motor shaft 28.

In order to enable the movement of the rolling rod 18 in the working direction Z relative to the tool slide 12, the clamping device 19 has at least one and, for example, two clamping bodies 36, which exert a clamping force F between the tool slide 12 and the rolling rod 18. Due to this clamping force F, the rolling rod 18 is pressed against the contact surface 17 of the carrier 15. The clamping force F can be a tensile force or a compressive force. In the exemplary embodiment, the clamping bodies 36 generate a compressive force that presses the rolling rod 18 against the carrier 15.

Each clamping body 36 is mounted so as to be movable in the working direction Z against the clamping force F. As a result, the carrier 15 and thus the rolling rod 18 can be moved and positioned in the working direction Z by means of the adjustment device 25.

In the exemplary embodiment, the clamping device 19 has a first clamping unit 37 and a second clamping unit 38. The clamping units 37, 38 each have a base body 39 which is immovably attached to the tool carriage 12 when the tool unit 10 is ready for use. The shape of the base body 39 can vary. The base bodies 39 of the two clamping units 37, 38 are preferably identical or similar in structure.

As it is in the Figures 2 , 3 and 7 As illustrated, the base body 39 of the first clamping unit 37 can be designed for arranging the adjustment device 25. For this purpose, the adjustment motor 26 can be arranged, for example, on the base body 39 of the first clamping unit 37. The coupling element 31 can be arranged in a recess or a central free space of the base body 39. The motor shaft 28 and the spindle 29 can protrude through recesses or through breaks in the base body 39.

The rolling rod 18 is arranged in the longitudinal direction X between the two clamping units 37, 38. The clamping units 37, 38 are designed to support the rolling rod 18 in the longitudinal direction X relative to the tool slide 12 in order to avoid a relative movement in the longitudinal direction X with respect to the tool slide 12. Forces acting on the rolling rod 18 in the longitudinal direction X are supported on the tool slide 12 via the clamping units 37, 38. Such longitudinal forces are not introduced into the carrier 15 or are only introduced to a small extent, so that when the cold rolling machine 11 is operating, only small forces are introduced from the carrier 15 into the adjustment device 25.

Preferably, at least one of the two clamping units 37, 38 and in the embodiment the first clamping unit 37 has a fixed stop surface 40 against which the roller rod 18 rests with an axial end. The fixed stop surface 40 is present on the base body 39 of the first clamping unit 37. When the tool unit 10 is ready for use, the fixed stop surface 40 is arranged immovably in the longitudinal direction X relative to the tool carriage 12.

A stop surface 41 for the rolling rod 18 that can be positioned in the longitudinal direction X can be present on the other clamping unit and, for example, on the second clamping unit 38. In the position of use, the axial end of the rolling rod 18 assigned to the second clamping unit 38 rests on the positionable stop surface 41.

Preferably, the fixed stop surface 40 is associated with the axial end of the rolling rod 18, which is arranged at the rear in the direction of movement of the tool unit 10 during the forming of the workpiece 20 - at least during the first or only forming stroke of the tool unit 10. Thus the forces in the longitudinal direction X, which act on the rolling rod 18 during the forming of the workpiece 20, are absorbed via the fixed stop surface 40 and, for example, the base body 39 and introduced into the tool slide 12 via the base body 39, preferably directly.

By means of the positionable stop surface 41, rolling rods 18 of different lengths can be arranged between the two clamping units 37, 38.

In the exemplary embodiment, each clamping unit 37, 38 has at least one and, for example, exactly one clamping body 36. In the exemplary embodiment, the clamping body 36 is pivotally mounted about a pivot axis S which extends obliquely or at right angles to the working direction Z. For example, the pivot axis S extends in the transverse direction Y ( Figure 2 ).

For pivoting mounting, the clamping body 36 is connected in a rotationally fixed manner to a shaft 45, for example. The shaft 45 is in turn rotatably arranged on the base body 39 of the respective clamping unit 37 or 38 ( Figures 3-5 and 7). The shaft 45 extends along the pivot axis S. In the embodiment illustrated here, the shaft 45 is arranged so that it can be moved or positioned in a longitudinal recess 46 extending in the longitudinal direction X. The longitudinal recess 46 is designed in the manner of an elongated hole or a longitudinal groove. The position of the shaft 45 within the longitudinal recess 46 can be adjusted and fixed, for example via a threaded pin 47 which extends in the longitudinal direction X and is arranged immovably in the longitudinal direction X on the base body 39. The threaded pin 47 is connected to a corresponding counter thread of the shaft 45 By rotating the threaded pin 47, the shaft 45 moves in the longitudinal direction X along the threaded pin 47.

In this way, the position of the pivotably mounted clamping body 36 can be adjusted in the longitudinal direction X relative to the base body 39 and thus relative to the tool carriage 12.

As is particularly the case in the Figures 2 to 5 As can be seen, the clamping body 36 of each clamping unit 37, 38 in the exemplary embodiment is designed as a two-armed lever which has a first arm 50 and a second arm 51. Each arm 50, 51 extends from the pivot axis S or the shaft 45 to a free end. The arms 50, 51 extend in different directions and, for example, starting from the pivot axis S or the shaft 45, opposite one another. The arms 50, 51 therefore form a straight lever. The length of the first arm 50 from the pivot axis to its free end is shorter than the length of the second arm 51 from the pivot axis to its free end.

The first arm 50 is designed to rest with its free end on the rolling rod 18 and in particular to exert the clamping force F in the working direction Z on the rolling rod 18 ( Figure 2 ). For this purpose, the second arm 51 of the clamping body 36 is supported on the base body 39 via at least one clamping element 52. By means of the at least one clamping element 52, a torque is generated on the clamping body 36 about the pivot axis S or the shaft 45, so that the first arm 50 presses against the roller rod 18 with the clamping force F in the working direction Z. The at least one clamping element 52 is a spring-elastic element or has a spring-elastic element as a component, such as at least one coil spring and/or at least one disc spring. The at least one clamping element 52 is compressible, so that the clamping body 36 can be rotated about the shaft 45 or the pivot axis S when the position of the carrier 15 or the roller rod 18 in the working direction Z is changed via the adjustment device 25. The amount of the clamping force F can change depending on the compression of the at least one clamping element 52.

In the embodiment described here, the positionable stop surface 41 is arranged on the clamping body 36 and, for example, the free end of the first arm 50. As explained, the clamping body 36 can be positioned in the longitudinal direction X relative to the base body 39, for example via the threaded pin 47. Alternatively, the positionable stop surface 41 could also be present on another component of the second clamping unit 38, which can be positioned in the longitudinal direction X relative to the base body 39.

Based on the Figures 3 and 5 it can be seen that the free end of the first arm 50 of the clamping body 36 of the first clamping unit 37 is arranged in the longitudinal direction X at a distance from the rolling rod 18. The rolling rod 18 is supported in the longitudinal direction X via the fixed stop surface 40 on the base body 39 and not via the clamping body 36.

In one embodiment, a sliding bearing is formed between the fixed stop surface 40 and the roller rod 18 ( Figures 2 , 3 and 7 ). Alternatively, at least one rolling element 53 could also be rotatably mounted on the base body 39, on which the fixed stop surface 40 is present ( Figure 5 ). This makes it possible to simplify the relative movement of the rolling rod 18 relative to the fixed stop surfaces 40 when positioning the rolling rod 18 in the working direction Z.

Based on the Figures 6 and 7 an optional support of the rolling rod 18 in the transverse direction Y is illustrated. For example, at least one support unit 54 is present on both sides of the rolling rod 18 in the transverse direction Y. Each support unit 54 is attached directly or indirectly to the tool carriage 12. In the exemplary embodiment, each support unit 54 has a holding body 55 which is attached to the support body 13. The holding body 55 extends from the support body 13 in the working direction Z to an end at which it carries a support element 56 which rests on the rolling rod 18. A sliding bearing or rolling bearing can be formed between the support element 56 and the rolling rod 18. In the exemplary embodiment shown here, each support element is formed by a rolling bearing pin or ball bearing pin which carries a rolling body 53 with which it rests on the rolling rod 18.

The number of support units 54 for supporting the rolling rod 18 can vary in particular depending on the length of the rolling rod 18 in the longitudinal direction X. In the exemplary embodiment, two support units 54 are arranged on both sides of the rolling rod 18. In the transverse direction Y, two support units 54 can be located opposite each other.

The invention relates to a tool unit 10 for a cold rolling machine 11. The tool unit 10 has a tool carriage 12 which can be moved linearly in a longitudinal direction X. A carrier 15 for a rolling rod 18 of the tool unit 10 is provided on the tool carriage 12. The carrier 15 can be positioned in a working direction Z by means of an adjustment device 25. For this purpose, the carrier 15 can preferably be moved linearly in the working direction Z. In the working direction Z, the rolling rod 18 is supported on the carrier 15 and is clamped against the carrier by means of a clamping device 19. For this purpose, the clamping device 19 has at least one clamping body 36 which can be moved in the working direction Z against a clamping force F and rests against the rolling rod 18. The clamping device is preferably not directly connected to the carrier 15. The clamping force F is supported directly or indirectly on the tool carriage 12, in particular by bypassing the carrier 15.

List of reference symbols:

10

Tool unit

11

Cold rolling machine

12

Tool carriage

13

Support body

14

Support surface

15

carrier

16

Floor area

17

Contact surface

18

Rolling bar

19

Clamping device

20

workpiece

21

Rolled profile

25

Adjustment device

26

Adjustment motor

27

Spindle arrangement

28

Motor shaft

29

spindle

30

Spindle nut

31

Coupling element

32

coupling

36

Clamping body

37

first clamping unit

38

second clamping unit

39

Base body

40

fixed stop surface

41

positionable stop surface

45

Wave

46

Longitudinal recess

47

Threaded pin

50

first arm

51

second arm

52

Clamping element

53

Rolling elements

54

Support unit

55

Holding body

56

Support element

α

Tilt angle

F

Tension

S

Swivel axis

X

Longitudinal direction

Y

Transverse direction

Z

Work direction

Claims (15)

1. Tool unit (10) for a cold rolling machine (11), comprising:

   - a tool slide (12) which is arranged to be linearly movable in the longitudinal direction (X),

   - a carrier (15) arranged on the tool slide (12) and configured to arrange a rolling bar (18) in such a way that a rolling profile (21) of the rolling bar (18) is aligned in a working direction (Z) perpendicular to the longitudinal direction (X),

   - an adjustment device (25) arranged on the tool slide (12), having an adjusting motor (26) and being configured to move the carrier (15) in the working direction (Z) relative to the tool slide (12) by means of the adjustment motor (26),

   - a clamping device (19) which is arranged on the tool slide (12) and comprises at least one clamping body (36) which is mounted so as to be movable in the working direction (Z) counter to a clamping force (F), the clamping device (19) being configured to urge the rolling bar (18) against the carrier (15) in the working direction (Z) by means of the at least one clamping body (36) .
2. Tool unit according to claim 1, wherein the tool slide (12) is arranged immovably in the working direction (Z).
3. Tool unit according to claim 1 or 2, wherein the clamping device (19) is arranged to support the rolling bar (18) in the longitudinal direction (X).
4. Tool unit according to one of the preceding claims, wherein the clamping device (19) has a first clamping unit (37) and a second clamping unit (38), which are arranged at a distance from one another in the longitudinal direction (X), such that the rolling bar (18) can be arranged between the two clamping units (37, 38).
5. Tool unit according to claim 3 and according to claim 4, wherein the first clamping unit (37) and/or the second clamping unit (38) has a fixed stop surface (40) for the rolling bar (18), which is arranged immovably in the longitudinal direction (X) relative to the tool slide (12).
6. Tool unit according to claims 3 and 4 or according to claim 5, wherein the first clamping unit (37) and/or the second clamping unit (38) comprises a positionable stop surface (41) for the rolling bar (18), which can be positioned in the longitudinal direction (X) relative to the tool slide (12) .
7. Tool unit according to claim 6, wherein the positionable stop surface (41) is arranged on the clamping body (36).
8. Tool unit according to one of claims 4 to 7, wherein each clamping unit (37, 38) has a base body (39) which is arranged on the tool slide (12).
9. Tool unit according to claim 8, wherein the adjusting motor (26) of the adjusting device (25) is arranged on the base body (39) of the first or clamping unit (37) or the second clamping unit (38).
10. Tool unit according to one of claims 4 to 9, wherein each clamping unit (37, 38) comprises at least one clamping body (36) .
11. Tool unit according to claim 9 and according to claim 10, wherein the at least one clamping body (36) is mounted on the base body (39) of the respective clamping unit (37, 38) so as to be positionable in the longitudinal direction (X).
12. Tool unit according to one of the preceding claims, wherein the at least one clamping body (36) is mounted pivotably about a pivot axis (S) which extends obliquely or perpendicular to the working direction (Z).
13. Tool unit according to claim 10 and according to claim 11, wherein the at least one clamping body (36) is arranged non-rotatably on a shaft (45) which extends along the pivot axis (S) and which is mounted positionably in the longitudinal direction (X) on the base body (39) of the respective clamping unit (37, 38).
14. Tool unit according to claim 12 or 13, wherein the at least one clamping body (36) has a first arm (50) extending away from the pivot axis (S) in one direction and a second arm (51) extending away from the pivot axis (S) in the other direction.
15. Tool unit according to claim 14, wherein the first arm (50) is arranged to rest against the rolling bar (18) and the second arm (51) is supported on the clamping unit (37, 38) via at least one clamping element (52) generating the clamping force (F).

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