JP2543915Y2 - Tool holding device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holding device capable of quickly mounting a tool body when the tool body is mounted on a tool block of a lathe.

[0002]

2. Description of the Related Art Conventionally, as such a tool holding device, there is one as shown in FIGS.
-236446).

In this device, a drawer 8 having an engaging claw 13 formed at the tip thereof in a through hole of a main body 4 is inserted so as to be able to freely advance and retreat in the axial direction and freely rotate about the axial direction.
When attaching and detaching the blade module 3, the hydraulic oil 15 is supplied to the cylinder chamber 12 to apply pressure to the piston portion 10 formed integrally with the drawer 8 to move the piston portion 10 in the axial direction so that the drawer 8 is moved. It moves to release the urging force of the disc spring 14, and operates the rack and pinion mechanism 18 to rotate the drawer 8 to rotate the engagement claw 13 without rotating the blade module 3.
The blade module 3 is engaged and disengaged (hereinafter, referred to as a first conventional example).

FIG. 8 shows a conventional tool holding device.
And the one shown in FIG.
507).

[0005] This is provided with a towing shaft 2 in an adapter 21.
4 is inserted so as to be able to advance and retreat in the axial direction, and a rotating sleeve 25 having a locking flange 26 formed on an end surface is rotatably attached to the leading end of the towing shaft 24 with respect to the towing shaft 24. As shown in FIG. 9, a guide groove 27 is formed in the guide groove 25.
The guide key 28 projecting from the side is engaged with the guide shaft 28 when the tool holder 23 is detached.
4 is moved in the axial direction, the rotating sleeve 25 is pulled by the engagement between the guide groove 27 and the guide key 28.
4 in conjunction with the movement of the rotation sleeve 4 to rotate the locking flange 26 formed on the end surface of the rotary sleeve 25, and to engage the engagement flange 26 and the tool holder 23 without rotating the tool holder 23. (Hereinafter, referred to as a second conventional example).

[0006]

However, in the first conventional example, the piston portion 1 formed integrally with the drawer 8 is not provided.
0 is rotated in the cylinder chamber 12, the rotating piston part 10 receives the viscous resistance with the hydraulic oil 15 in the cylinder chamber 12, and the rotational force for rotating the drawer 8 increases. 8 cannot be rotated and the blade module 3 cannot be attached or detached.

In the second conventional example, the locking sleeve 26 is rotated by rotating the rotary sleeve 25 in conjunction with the movement of the towing shaft 24 in the axial direction. There is.

When removing the tool holder 25, if the locking flange 26 is rotated before the towing shaft 24 has completely moved to the tool holder 23 side, the tool holder 25 is rotated.
The engagement flange 26 rotates in a state of being pressed against the engagement groove, and the wear of the engagement flange 26 and the engagement groove of the tool holder 25 is promoted.

When the tool holder 23 is mounted, if the towing shaft 24 moves to the opposite side of the tool holder 23 before the engagement of the engagement flange 26 with the engagement groove of the tool holder 25 is completed, the engagement of the engagement flange The portion 26 and the engagement groove of the tool holder 25 interfere with each other, resulting in poor engagement.

The present invention has been made in view of the above circumstances, and has as its object to provide a tool holding device capable of quickly and reliably clamping a tool body.

[0011]

Tool holding device according to claim 1 of the present invention SUMMARY OF THE INVENTION comprises a tool block body having a through hole penetrating in the axial direction, a tool body to be fitted from one end of the through hole, A clamp rod that is fitted into the through hole and clamps one end of the tool body; an elastic body that urges the clamp rod toward a side opposite to the tool body side; A pressure chamber to which a fluid is supplied, and when the pressurized fluid is supplied to the pressure chamber, the pressure chamber is displaced toward the tool body, and the clamp rod is displaced toward the tool body to release the urging force of the elastic body. A supporting hole is formed through the piston in the axial direction, and the clamp rod is rotatably fitted into the support hole, and the clamp rod is An engaging portion that engages with the piston when the piston is displaced to the tool body side, and a motor that rotates the clamp rod is connected to the clamp rod. .

[0012]

[0013]

According to the first aspect of the present invention, since the clamp rod is rotatably fitted into the support hole penetrating the piston, the pressurized fluid is supplied to the hydraulic chamber and the piston is moved toward the tool body. The clamp rod can be rotated independently of the piston even when the clamp rod is displaced, and the torque of the clamp rod can be prevented from increasing due to the influence of the pressure or viscosity of the pressurized fluid. .
Therefore, the clamp rod can be reliably rotated with a small rotational force, and the tool body can be quickly and reliably attached and detached.

[0014]

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tool holding device according to an embodiment of the present invention;

As shown in FIG. 1, the tool block body 3
A through hole 31 penetrating in the axial direction is formed in 0, and a clamp rod 32 is fitted in the through hole 31. At the left end of the clamp rod 32 in the figure, there is formed an engagement claw 35 arranged in a cross shape as viewed in the axial direction as shown in FIG. 3, and this engagement claw 35 is indicated by a two-dot chain line in the figure. The tool body 33 is inserted into an engagement groove 34 formed at one end of the illustrated tool body 33 in a cross shape when viewed from the axis.

In the vicinity of the left end of the clamp rod 32 in the drawing, a coolant passage 36 for supplying a coolant such as air or cooling oil for cooling the tool is formed.
6 communicates with a port 37 formed in the tool block main body 30. An X-ring 38 is mounted on the clamp rod 32 near the inlet of the coolant passage 36 to prevent coolant from leaking. This X ring 38 is a clamp rod 3
The sealing property can be ensured even when 2 rotates.

A pair of annular spring receiving plates 39 and 40 are mounted near the right end of the clamp rod 32 in the drawing, and the spring receiving plate 40 is movable relative to the clamp rod 32 in the axial direction. The spring receiving plate 39 is movable in the axial direction of the clamp rod 32 by screwing a nut 41 into a screw portion formed on the clamp rod 32. A plurality of disc springs 42 are interposed between the spring receiving plates 39 and 40 in a compressed state. Therefore, the clamp rod 32 is urged to move rightward in the figure by the repulsive force of the disc spring 42. In addition,
Spring receiving plate 40 and through hole 31 of tool block body 30
And a thrust bearing 43 is interposed between them.

A cylindrical piston 45 having a support hole 44 penetrating in the axial direction is mounted at an intermediate portion of the clamp rod 32 in the drawing so as to be movable in the axial direction. Is coaxially inserted into the inside. A pressure chamber 46 is formed by the right end surface of the piston 45 in the drawing and the inner wall surface of the through hole 31 of the tool block main body 30. A port 47 formed in the tool block main body 30 communicates with the pressure chamber 46, and a port 4 is formed.
7 is connected to a pump 51 via an electromagnetic valve 50.
Seal rings 48 and 49 are attached to the piston 45 at two locations separated in the axial direction to seal the pressure chamber 46. The piston 45 is in contact with a stepped portion (engaging portion) 53 formed on the clamp rod 32 via a thrust bearing 52.

A proximity switch 57 and a proximity switch 58 are mounted near the right end of the tool block main body 30 in the drawing. The proximity switch 57 faces the nut 41 screwed to the clamp rod 32 when the clamp rod 32 moves to the right side in the figure, and the proximity switch 58 moves the clamp rod 32 to the left side in the figure. When it moves, it faces the nut 41 screwed to the clamp rod 32. Here, the proximity switches 57 and 58 constitute the axial displacement detecting means of the present invention.

A hydraulic motor 55 is attached to the right end face of the tool block main body 30 in the drawing, and the rotation shaft of the hydraulic motor 55 is connected to a clamp rod 32 via a key.
It is connected to. The hydraulic motor 55 is connected to the pump 51 via an electromagnetic valve 56. Inside the hydraulic motor 55, there is provided a stopper (not shown) with which the rotating shaft comes into contact when the rotating shaft rotates by 45 °. As shown in FIG. 2, a plate-shaped member 61 is attached to the outer end of the rotation shaft, and flat portions 59 and 60 are formed on the outer periphery of the plate-shaped member 61. Further, the two proximity switches 62 and 63 are connected to the plate-like member 6 at two locations separated in the circumferential direction.
1 is mounted facing the outer periphery. In the state of FIG. 2, the flat portion 60 is detected by the proximity switch 62. When the rotation shaft of the hydraulic motor 55 is rotated by 45 ° from this state, the flat portion 59 is detected by the proximity switch 63.

The tool holding device of this embodiment has a control device 65.
Is provided. The control device 65 includes a proximity switch 5
7, 58, 62 and 63 are connected to the control device 6
5 is connected to the solenoids of the solenoid valves 50 and 56.
The control device 65 controls the proximity switches 57, 58, 62, 6 according to a program stored in the microcomputer.
A control signal is issued to the solenoid valves 50 and 56 based on the output of the control signal 3.

Next, the operation of the tool holding device according to the present embodiment will be described with reference to FIGS.

First, the case where the tool main body 33 is attached to the tool block main body 30 will be described with reference to the flowchart shown in FIG.

In step 1 (referred to as S1 in the figure, the same applies hereinafter), the control device 65 issues a switching signal to the solenoid of the solenoid valve 50 to supply the pressurized hydraulic oil to the pressure chamber 46. . Accordingly, the piston 45 moves to the left side in the figure due to the pressure of the hydraulic oil, the clamp rod 32 moves to the left side in the figure via the stepped portion 53, and the urging force by the disc spring 42 is released.

In step 2, it is determined from the outputs of the proximity switches 57 and 58 whether or not the clamp rod 32 has moved to the left side in the figure by a predetermined amount (unclamped state).
When the proximity switch 57 is turned off and the proximity switch 58 is turned on, it is determined that the clamp rod 32 has moved a predetermined amount to the left in the drawing. The output is turned off because it no longer opposes the screwed nut 41 of 32, and the output is turned on because the proximity switch 58 opposes the nut 41.) Step 2 is provided in the pressure chamber 4
6, the clamp rod 32 does not immediately move completely to the left in the drawing, so that the clamp rod 32
This is to confirm that has completely moved.

In step 3, the solenoid valve 56 is switched to supply hydraulic pressure to the hydraulic motor 55 to rotate the clamp rod 32, and to engage the tool body 33 to which the engaging claw 35 formed at the tip of the clamp rod 32 is to be attached. It is rotated in the direction (unclamping side) where the phase matches the mating groove 34.

In step 4, it is determined whether or not the rotation shaft of the hydraulic motor 55, that is, the clamp rod 32 has rotated 45 ° (unclamped state) by the proximity switches 62 and 6.
3 is determined based on the output. When the proximity switch 62 is turned on and the proximity switch 63 is turned off, the clamp rod 32
Is determined to have rotated 45 °. The reason for providing step 4 is to confirm that the clamp rod 32 is completely rotated and is in the unclamped state because the clamp rod 32 does not immediately rotate even when the hydraulic pressure is supplied to the hydraulic motor 55. .

In step 5, a signal is transmitted to a tool attaching / detaching device (not shown) indicating that the tool main body 33 can be mounted in the tool holding device.

In step 6, the tool body 33 to be mounted is conveyed by the tool attaching / detaching device, and the side of the tool body 33 where the engaging groove 34 is formed is inserted into the through hole 31 of the tool block body 30. Hold 33.

In step 7, a switching signal is issued from the control device 65 to the solenoid of the solenoid valve 56, hydraulic pressure is supplied to the hydraulic motor 55, the clamp rod 32 is rotated, and the engagement formed at the tip of the clamp rod 32 is engaged. The direction in which the claw 35 is out of phase with the engagement groove 34 of the tool body 33 (clamp side)
Rotate to.

In step 8, it is determined whether or not the rotating shaft of the hydraulic motor 55, that is, the clamp rod 32 has been rotated by 45 ° in the opposite direction to that in step 4 (clamp state), based on the outputs of the proximity switches 62 and 63. I do. When the proximity switch 62 is turned off and the proximity switch 63 is turned on, it is determined that the clamp rod 32 has rotated 45 °. Step 8 is provided because, similarly to step 4, the clamp rod 32 does not immediately rotate even when the hydraulic pressure is supplied to the hydraulic motor 55, so that the clamp rod 32 is completely rotated to be in the clamped state. This is to confirm.

In step 9, a switching signal is issued from the control device 65 to the solenoid of the solenoid valve 50, and the supply of hydraulic oil to the pressure chamber 46 is stopped. As a result, the hydraulic pressure acting on the piston 45 disappears, so that the urging force of the disc spring 42 acts on the clamp rod 32 and the clamp rod 32
Is moved to the right in the figure, and the tool body 33 is inserted into the through hole 3.
1 and is energized.

In step 10, it is determined whether or not the clamp rod 32 has moved to the right side in the drawing by a predetermined amount (clamp state) based on the outputs of the proximity switches 57 and 58. When the proximity switch 57 is turned on, the clamp rod 32
Is determined to have moved to the right side in the figure by a predetermined amount (the proximity switch 57 opposes the nut 41 screwed to the clamp rod 32, so that the output is turned on). The step 10 is provided because, similarly to the step 2, the clamp rod 32 does not completely move rightward in the drawing immediately after the supply of the hydraulic oil to the pressure chamber 46 is stopped. This is to confirm that it has moved. When it is detected in step 10 that the clamped state has been reached, the tool body 33 is completely held by the tool holding device.

Next, a case where the tool main body 33 is detached from the tool block main body 30 according to the flowchart shown in FIG. 5 will be described.

In step 11, similarly to step 1,
The control device 65 issues a switching signal to the solenoid of the solenoid valve 50 to supply hydraulic oil to the pressure chamber 46. Accordingly, the piston 45 moves to the left side in the figure due to the pressure of the hydraulic oil, the clamp rod 32 moves to the left side in the figure via the stepped portion 53, and the urging force by the disc spring 42 is released.

In step 12, as in step 2,
The proximity switches 57 and 5 determine whether the clamp rod 32 has moved to the left side in the figure by a predetermined amount (unclamped state).
8 is determined. When the proximity switch 57 is turned off and the proximity switch 58 is turned on, the clamp rod 32
Is determined to have moved a predetermined amount to the left in the figure.

In step 13, similarly to step 3,
The solenoid valve 56 is switched to supply hydraulic pressure to the hydraulic motor 55 to rotate the clamp rod 32, and the clamp rod 32
Is rotated in the direction (unclamping side) where the phase matches the engagement groove 34 of the tool body 33 attached.

In step 14, similarly to step 4,
The rotating shaft of the hydraulic motor 55, that is, the clamp rod 3
It is determined whether or not 2 has rotated 45 ° (unclamped state) based on the outputs of the proximity switches 62 and 63. When the proximity switch 62 is turned on and the proximity switch 63 is turned off,
It is determined that the clamp rod 32 has rotated 45 °.

In step 15, a signal is transmitted to a tool attaching / detaching device (not shown) indicating that the tool main body 33 can be removed from the tool holding device.

In step 16, the tool main body 33 is inserted into the tool block main body 30 through the through hole 31 by the tool attaching / detaching device.
Remove.

At step 17, a switching signal is issued from the control device 65 to the solenoids of the solenoid valves 50 and 56. As a result, the supply of the hydraulic oil to the pressure chamber 46 is stopped, and the hydraulic pressure acting on the piston 45 disappears.
Is applied to the clamp rod 32, and the clamp rod 32 is moved rightward in the figure. Further, a hydraulic pressure is supplied to the hydraulic motor 55 to rotate the clamp rod 32, and the engaging claw 35 formed at the tip of the clamp rod 32 is out of phase with the engaging groove 34 of the tool body 33 to be mounted next. Rotate to.

In this embodiment, the solenoid valve 50 is switched to
By applying hydraulic pressure to the pressure chamber 46, the proximity switches 57 and 5 indicate that the clamp rod 32 has completely moved to the left in the drawing.
8, the solenoid valve 56 is switched to supply hydraulic pressure to the hydraulic motor 55 to rotate the clamp rod 32. Therefore, the clamp rod 32 is completely moved to the left side in the figure and The clamp rod 32 can be rotated in a state in which the urging force by 42 is completely released. Therefore, when the urging force is applied to the clamp rod 32 (the state where the engaging claw 35 formed on the clamp rod 32 and the engaging groove 34 formed on the tool body 33 are pressed against each other by the urging force), Can be prevented from rotating, wear of the engaging claw 35 and the engaging groove 34 can be prevented beforehand, and
It is possible to prevent the clamp rod 32 from being unable to rotate due to the pressure contact between the engagement claw 35 and the engagement groove 34, and to reliably engage the engagement claw 35 with the engagement groove 35. .

In this embodiment, the solenoid valve 56 is switched to
By applying hydraulic pressure to the hydraulic motor 55, the clamp rod 3
After confirming by the proximity switches 62 and 63 that the engaging pawl 2 has been rotated by a predetermined angle and the engaging claw 35 is completely out of phase with the engaging groove 34 of the tool main body 33, the solenoid valve 50 is switched and the pressure is reduced. Since the supply of the hydraulic oil to the chamber 46 is stopped and the urging force of the disc spring 42 is transmitted to the clamp rod 32, the urging force is reduced after the clamp rod 32 rotates by a predetermined angle to be able to clamp. Tool body 33
Can be transmitted. Therefore, it is possible to prevent the urging force of the disc spring 42 from being transmitted when the rotation of the clamp rod 32 is incomplete, and the clamp rod 3
Poor engagement between the second engaging claw 35 and the engaging groove 34 of the tool body 30 can be prevented beforehand, and the tool body 33 can be securely held.

In this embodiment, a cylindrical piston 45 having a support hole 44 in the through hole 31 of the tool block main body 30 is provided.
Is inserted movably in the axial direction.
5, the clamp rod 32 is rotatably inserted into the support hole 44. Therefore, even when the hydraulic oil is supplied to the pressure chamber 46 adjacent to the piston 45 to move the piston 45 in the axial direction, the clamp rod 32 is 45 can be rotated independently. Therefore, the clamp rod 32
Can be rotated without receiving the viscous resistance of the hydraulic oil supplied to the pressure chamber 46, and the rotational force of the clamp rod 32 is prevented from increasing due to the viscous resistance of the hydraulic oil as in the first conventional example. And the clamp rod 32 can be surely rotated by a small rotational force. Thereby, the engaging claw 35 of the clamp rod 32 can be surely rotated to engage with the engaging groove 34 of the tool body 33 reliably and quickly.

In this embodiment, since the pressure chamber 46 is sealed by the seal rings 48 and 49 and the pressure chamber 46 is shielded from the support hole 44 of the piston 45, the clamp rod is provided in the support hole 44 of the piston 45. Even if 32 is rotatably inserted, it is possible to prevent the operating oil supplied to the pressure chamber 46 from leaking from the contact portion between the support hole 44 and the clamp rod 32.

[0047]

As described above, according to the tool holding device of the present invention, since the clamp rod is rotatably fitted into the support hole penetrating the piston, the pressurized fluid is supplied to the hydraulic chamber. Even when the piston is displaced toward the tool body, the clamp rod can be rotated independently of the piston, and the torque of the clamp rod increases due to the pressure and viscosity of the pressurized fluid. Can be suppressed. Therefore, the clamp rod can be reliably rotated with a small rotational force, and the tool body can be quickly and reliably attached and detached.

[0048]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a tool holding device according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 viewed from the right side.

FIG. 3 is a side view of FIG. 1 as viewed from the left side.

FIG. 4 is a flowchart illustrating a process when the tool main body is mounted using the tool holding device according to the embodiment of the present invention;

FIG. 5 is a flowchart showing a process when the tool main body is removed using the tool holding device according to the embodiment of the present invention;

FIG. 6 is a sectional view showing a conventional tool holding device.

FIG. 7 is a view showing a rotation mechanism of the tool holding device shown in FIG. 6;

FIG. 8 is a sectional view showing a conventional tool holding device.

FIG. 9 is a plan view showing a rotating sleeve used in the tool holding device shown in FIG.

[Explanation of symbols]

 Reference Signs List 30 tool block body 31 through hole 32 clamp rod 33 tool body 34 engagement groove 35 engagement claw 42 disc spring (elastic body) 44 support hole 45 piston 46 pressure chamber 53 stepped portion (engagement portion) 55 hydraulic motor 57, 58 Proximity switch (axial displacement detection means) 65 Control device (control means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Matsuura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References Japanese Utility Model No. 4-70410 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A tool block body having a through hole penetrating in an axial direction, a tool body fitted from one end of the through hole, and a clamp rod fitted into the through hole and clamping one end of the tool body. An elastic body for urging the clamp rod toward the side opposite to the tool body, a pressure chamber provided inside the through-hole and supplied with a pressurized fluid, and a pressurized fluid supplied to the pressure chamber. And a piston for displacing the clamp rod to the tool body side to release the biasing force of the elastic body when the tool is held. The clamp rod is rotatably fitted in the support hole, and is inserted into the clamp rod when the piston is displaced toward the tool body. A tool holding device, wherein an engaging portion for engaging with the ston is formed, and a motor for rotating the clamp rod is connected to the clamp rod.