JP4925777B2 - Turret with coolant supply device - Google Patents

Description

  The present invention relates to a tool post including a device for supplying coolant to a tool having an internal flow path.

  Generally, in cutting with a machine tool or the like, the temperature of the tool and the workpiece rises due to cutting resistance and friction. Since this temperature rise may deteriorate or damage the tool or lower the machining accuracy, coolant is supplied to the cutting site. There are various coolant supply means and methods, and there is a method of supplying coolant by providing an internal flow path for coolant in the tool. Various tools having an internal coolant channel are known, and are described in, for example, Patent Documents 1 and 2.

  Various turrets for holding a tool are known. For example, Patent Documents 3 and 4 disclose turrets and turret turrets for comb-type lathes.

JP-A-10-296506 JP 2006-55916 A JP-A-8-39303 JP 2002-103178 A

  The pressure of the coolant supplied to each tool becomes a high pressure of several MPa depending on the application. Therefore, when supplying the coolant from the rear end portion of the tool into the internal flow path, time-consuming connecting means such as screwing has been employed to prevent leakage of the coolant. Further, in the configuration described in Patent Document 4, it is necessary to provide an injection nozzle at the outlet of the flow hole of the turret face plate, or to form a coolant supply hole in a tool holder that holds the rear end of the tool, and the structure is somewhat complicated. Become.

  Therefore, an object of the present invention is to provide a tool post that can easily connect a coolant supply device and a tool with a simple configuration while ensuring prevention of coolant leakage.

In order to achieve the above object, the invention according to claim 1 is a cutter having a flow path for holding a tool having a through hole for coolant and supplying the coolant to the through hole of the held tool. A moving body that is movably provided with respect to the main body of the tool post, the flow path is formed in the moving body, and the flow path and the through hole communicate with the moving body. The pressing means for pressing toward the through hole of the tool is provided, the pressing means has a rod-like member that intersects the moving direction of the moving body and is rotatably supported by the main body, The circumferential surface of the rod-shaped member is in contact with the moving body, and the rod-shaped member acts as a cam mechanism by the rotation of the rod-shaped member, and the movable body is pressed by the circumferential surface , Provide turret.

The invention according to claim 2 provides the tool rest according to claim 1, wherein the pressing portion of the rod-shaped member has a shape obtained by cutting a part of a circle in a radial cross section thereof.

According to a third aspect of the present invention, in the tool post according to the first aspect , the pressing portion of the rod-shaped member has a circular shape in its radial cross section, and is centered on an axis that is eccentric from the rotation axis of the rod-shaped member. A tool post configured to rotate is provided.

The invention according to claim 4 is the tool post according to any one of claims 1 to 3 , wherein the main body is connected to the first block member to which the coolant supply device is connected and the tool holder. A second block member, and the first and second block members are connected to each other by a plug having a through hole in fluid communication with both of the internal flow paths formed in the first and second members, A tool post for supplying fluid to the flow path of the moving body via the internal flow path is provided.

According to a fifth aspect of the present invention, in the tool post according to the fourth aspect , the plug has a substantially cylindrical shape extending coaxially with the through hole, and the first and A tool post having an O-ring that abuts a second block member to form a seal is provided.

The invention according to claim 6 is the tool post according to any one of claims 1 to 5, wherein the main body has a plurality of internal flow paths for supplying fluid to the flow path of the movable body, Each of the flow paths provides a tool post having a closing member that blocks communication with the flow path so as to be freely opened and closed .

  According to the present invention, leakage of the coolant can be reliably prevented by operating the pressing means having a simple structure after the tool holder holding the tool is attached to the coolant supply device. In addition, troublesome work such as screwing into the rear end of the tool is not necessary, and the labor and time of work such as tool change can be greatly reduced.

  The pressing means advantageously has a cam mechanism with a simple structure, and can be constituted by, for example, a rod-shaped member configured such that its axial direction is substantially perpendicular to the moving direction of the moving body. In that case, the portion of the rod-shaped member that contacts the moving body acts as a cam mechanism by the rotation of the rod-shaped member.

  In addition, it is advantageous from the viewpoint of avoidance of interference and ease of manufacture that the block member can be divided into a first block member to which the coolant supply device is connected and a second block member to which the tool holder is connected. In this case, the first and second block members can be connected to each other by a plug having a through hole that is in fluid communication with both of the internal flow paths formed in the first and second members. Furthermore, the plug is configured in a substantially cylindrical shape extending coaxially with the through-hole, and an O-ring that contacts the first and second members to form a seal is provided on the outer peripheral portion of the plug, so that the hydraulic pressure of the coolant is reduced. Even if it is high, a reliable seal can be formed.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIGS. 1 and 2 are a front view and a top view, respectively, showing a configuration of a preferred embodiment of a tool post 10 according to the present invention used in a machine tool (not shown). The tool post 10 includes a first block member 16 to which three supply pipes 14 a, 14 b and 14 c extending from the coolant supply device 12 schematically illustrated are connected, a second block member 18 connected to the first block member 16, and It has the 2nd block member 18 and the tool holder 20 comprised so that attachment or detachment was possible. The tool holder 20 can hold at least one tool, but can generally hold a plurality (five in the illustrated example) of tools 22 and can use the tools appropriately according to the shape of the workpiece W to be processed. .

  The coolant supply pipes 14a, 14b, and 14c are connected to the first block member 16 using known joints 24a, 24b, and 24c, respectively. For example, high pressure (for example, about 7 MPa), medium pressure (for example, about 1.5 MPa), and low pressure, respectively. Coolant can be supplied (eg, pressure that causes dripping from the tip of the tool). Further, as will be described later, the supply pipe to be used can be switched without requiring a work such as replacement of the joint. The first and second blocks may be integrated members, but it is preferable to form an L-shape as a whole as shown in FIG. 2 in order to avoid interference between the supply pipe and the tool or workpiece.

  3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. First, as shown in FIG. 4, the coolant supplied from each supply pipe flows in the first flow paths 26a, 26b and 26c in the first block 16, and reaches the second block 18 via the plugs 28a, 28b and 28c. Led. The plugs 28a, 28b, and 28c fluidly communicate the first flow paths 26a, 26b, and 26c of the first block 16 and the second flow paths 30a, 30b, and 30c in the second block 18, respectively. Further, the plugs 28a, 28b and 28c have a substantially cylindrical shape having through holes or flow paths 32a, 32b and 32c, respectively, and first and second O-rings 34a and 36a, 34b and 36b, and 34c and 36c. The first O-rings 34a, 34b, and 34c form abutment or seal with the first block 16 at the cylindrical radially outer portion of the plug, not at the joint surface 38 between the first block 16 and the second block 18. Similarly, the second O-rings 36a, 36b and 36c abut or form a seal with the second block 18 at the cylindrical radially outer portion of the plug. According to such a configuration, the hydraulic pressure of the coolant acts to expand the plug radially outward (that is, the O-ring is crushed). Therefore, even if the coolant is at a high pressure, the first block 16 and the second block 18 are used. There will be no leakage of coolant between them. Further, since a reliable seal is formed in each O-ring as described above, it is not necessary to generate a surface pressure on the joint surface 38 between the first block 16 and the second block 18, and thus high manufacturing accuracy. Is not required.

  As can be seen from FIG. 3, which of the coolant guided into the second flow paths 30a, 30b and 30c of the second block 18 is used for processing depends on a closing member provided in each flow path, for example, a set screw 40a. , 40b and 40c. That is, as shown in detail in FIG. 5, the set screws (the set screws 40 a and 40 b in the illustrated example) of the flow path relating to the unused coolant are tightened (moved to the right in FIG. 5) to close the flow path and use The set screw (the set screw 40c in the illustrated example) of the flow path related to the coolant is loosened (moved to the left in FIG. 5) to open the flow path. Thus, the coolant of the required pressure can be supplied to the tool by loosening any one set screw and tightening the other.

  As shown in FIG. 3 or FIG. 4, the above-mentioned selected coolant is supplied to a substantially cylindrical moving body 42 arranged in the second block 18. The moving body 42 is configured to be able to move somewhat in the direction in which the inside of the second block 18 contacts and separates from the tool 22 (vertical direction in the illustrated example). The The moving body 42 also has a third flow path 44 that fluidly communicates with any of the second flow paths 30a, 30b, and 30c. The third flow path 44 opens at the first end 46 of the moving body 42. On the other hand, the tool 22 has a fourth flow path 50 that opens at the rear end portion 48, and the first end portion 46 of the moving body 42 and the rear end portion 48 of the tool 22 abut via the third O-ring 52. As a result, the third flow path 44 is in fluid communication with the fourth flow path 50.

  FIGS. 6A and 6B are views showing alternative forms of enlarged views of the first end portion 46 and the third O-ring 52 of the moving body 42. The first end 46 is formed with a recess 56 that accommodates the third O-ring 52. Here, as shown in FIG. 6B, in order to prevent the third O-ring 52 from dropping when the tool is changed, it is preferable that the concave portion 56 has a tapered shape in which the inner diameter decreases downward, that is, toward the open end. A structure that does not use the third O-ring is also possible.

  As shown in FIG. 3, the second end 58 on the opposite side of the first end 46 of the moving body 42 abuts against the pressing means provided on the second block 18, that is, the rod-shaped member 60. The rod-shaped member 60 is arranged so that its axial direction is substantially orthogonal to the moving direction of the moving body 42, and as shown in FIGS. 7 (a) and 7 (b), an axial direction from the rear portion 62, that is, the rear end. In the portion extending over the length (that is, the pressing portion), the radial cross section is not completely circular but has a shape obtained by cutting away a part (for example, cutting along a certain chord), and acts as a kind of cam mechanism. Further, the rod-shaped member 60 has a concave portion that engages with a tool such as a hexagon wrench or a screwdriver in a front portion 63 opposite to the rear portion 62, and is configured to be rotatable about its own axial direction.

  The rod-shaped member 60 is at the rotational position shown in FIG. 7A when the tool is exchanged, etc., and is rotated, for example, by about 90 degrees before the start of use (machining) after the tool is attached to reach the rotational position shown in FIG. . Therefore, in the state of FIG. 7B, the moving body 42 is urged downward, that is, toward the tool 22, so that the first end portion 46 of the moving body 42 is pressed against the rear end portion 48 of the tool 22, A leak-free seal is formed. According to such a configuration, the work of screwing the coolant supply pipe into the rear end portion of the tool as in the prior art is unnecessary, and leakage can be reliably prevented by a simple operation of rotating the rod-shaped member 60. it can. Further, since the supply pipe can always be connected to the first block 16 as described above, it is not necessary to replace the coolant supply pipe every time the tool is changed as in the prior art, and therefore troublesome screwing work occurs except for maintenance. There is no.

  Further, the radial cross section of the rear portion 62 of the rod-shaped member 60 is not a shape obtained by cutting a part of the circle as shown in FIGS. 7A and 7B, but as shown in FIGS. 8A and 8B. The circular shape eccentric about the rotation axis of the member 60 may be used. In this case, the rod-shaped member 60 is at the rotational position shown in FIG. 8A when the tool is changed, and is rotated by, for example, about 180 degrees before the start of use after the tool is mounted, and reaches the rotational position shown in FIG. In other words, the pressing means in the present invention can displace the moving body 42 in the direction in which the moving body 42 is in contact with or separated from the tool 22 by a simple operation such as rotation.

  In addition, as shown in FIG. 3, in order to prevent the moving body 42 from dropping when the tool 22 is removed as in the tool change, a groove 64 is formed in a part of the outer periphery of the moving body 42, Furthermore, it is preferable to arrange the fall prevention screw 66 related to the groove 64 at a proper position in the second block 18.

It is a front view of the tool post which concerns on this invention. It is a top view of the tool post of FIG. It is a figure which shows the AA cross section of FIG. It is a figure which shows the BB cross section of FIG. It is a figure which shows the detail of the set screw of a 2nd block member. It is a figure which shows the detail of the edge part of a moving body. (A) It is a figure which shows the state which the bar-shaped member is not urging | biasing a moving body in a tool direction, (b) It is a figure which shows the state which is urging | biasing a mobile body in a tool direction. (A) It is a figure similar to Drawing 7 (a), and is a figure showing the state where the rod-shaped member of other forms has not energized the moving object to the tool direction, (b) The rod-shaped member attaches the moving object to the tool direction. It is a figure which shows the state which is energizing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tool post 16 1st block 18 2nd block 20 Tool holder 22 Tool 28a, 28b, 28c Plug 40a, 40b, 40c Set screw 42 Moving body 60 Rod-shaped member 62 Cam W Workpiece

Claims (6)

A tool post having a flow path for holding a tool having a through hole for coolant and supplying the coolant to the through hole of the held tool ,
A movable body provided to be movable with respect to the main body of the tool post, and forming the flow path in the movable body;
A pressing unit that presses the moving body toward the through hole of the tool so that the flow path and the through hole communicate with each other;
The pressing means has a rod-shaped member that intersects the moving direction of the movable body and is rotatably supported by the main body, and a peripheral surface of the rod-shaped member abuts on the movable body, and the rod-shaped member rotates by rotation. The tool post, wherein the bar-shaped member acts as a cam mechanism and is configured to press the moving body by the peripheral surface . The turret according to claim 1, wherein the pressing portion of the rod-shaped member has a shape obtained by cutting a part of a circle in a radial cross section thereof . 2. The tool post according to claim 1 , wherein the pressing portion of the rod-shaped member has a circular shape in a radial cross section thereof, and is configured to rotate around an axis that is eccentric from a rotation axis of the rod-shaped member . The main body includes a first block member to which the coolant supply device is connected and a second block member to which the tool holder is connected. The first and second block members are the first and second members. Any one of Claims 1-3 connected with each other by the plug provided with the through-hole which fluidly communicates with both of the internal flow paths formed in the flow path, and supplying the fluid to the flow path of the moving body via the internal flow paths. The tool post according to claim 1 . The plug has a substantially cylindrical shape extending in a coaxial direction with the through hole, and has an O-ring that forms a seal by contacting the first and second block members at a radially outer portion of the plug. Item 5. The tool post according to Item 4 . The main body has a plurality of internal flow paths for supplying fluid to the flow path of the moving body, and each of the internal flow paths has a closing member that opens and closes communication with the flow path . The turret according to any one of 5.

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