JPS61236405A - Chucking device of machine tool - Google Patents

Abstract

PURPOSE:To simplify a mechanism with no use of a fluid rotary coupling, by holding a work fixing member to be pressed by means of restoring force of a resilient member, in the case of a chucking device for simultaneously turning a shaft or cylindrical work from its both end sides. CONSTITUTION:A chucking device is operated in such a way that a work D is positioned, at the left end part thereof, by a supporting member 31 of a main spindle 33 so as to be clamped by a chuck 28 from the peripheral side. By this action, a movable member 27 is pressed leftward while a fixed member 39 or the like is pressed leftward through a guide rod 19, so that the chuck 28 is pressed leftward along a conical pat 40. And when the work D is removed, pressurized fluid is supplied from an inlet/outlet part 16 into an actuator 6. In this way, a piston 17 is moved rightward while the movable member 37 or the like is pressed rightward, so that the chuck 28 is moved rightward. This device, using no fluid pressure for tightening the chuck to be fixed, enables a mechanism to be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chucking device for a machine tool.

[Prior Art] A chucking device for simultaneously turning a shaft or a cylindrical object from both ends is disclosed in, for example, Japanese Patent Laid-Open No. 58-90404. This conventional technology requires a fluid rotation joint between the fluid pressure source and the tightening mechanism because an external force acts on the bearing and the workpiece that is tightened and held by fluid pressure is rotated. The issue is its durability.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the need for a fluid rotary joint that communicates a mechanism or a workpiece fixing mechanism with an external fluid pressure source for tightening a workpiece, and in addition, the workpiece fixing force is achieved by using a bearing. The object of the present invention is to provide a chucking device for a machine tool that does not act on the machine tool.

[Means for solving the problem] In order to achieve the above object, the configuration of the present invention includes a workpiece fixing mechanism that includes a fixing means for fixing a workpiece and rotates in conjunction with the main shaft of a machine tool, and a workpiece fixing mechanism that rotates in conjunction with the main shaft of a machine tool. a workpiece fixing function release mechanism that is provided with a release means for releasing the fixation function of the mechanism and is fixedly supported on the machine tool by a support member;
It consists of a pair of bearing mechanisms that support the main shaft of the J workpiece fixing mechanism.

[Operation] The left end of the workpiece D is positioned by the support member 31 fixed to the left end of the cylindrical portion 33a of the main shaft 33, and is held by the chuck 28 from the outer circumferential side. When this chuck 28 is pushed to the left by bending the elastic member 30,
The conical portions 40 are configured to contract inwardly to hold down the workpiece D. The thrust force acting on the chuck 28 is provided by a spring 29. That is, when the movable member 37 is pushed to the left by the spring 29, the fixed member 39 is pushed to the left via the guide rod 19, and can slide on the pressing member 26 and the rotating member 33 that are screwed and fixed thereto. The chuck 28 presses the conical portion 40 via the pressing member 27 supported by the
is pushed to the left along

When removing the workpiece D, the pressing force of the workpiece fixing mechanism B is released by the workpiece fixing function release mechanism A. That is, when pressurized fluid is supplied from the inlet/outlet 16 to the inside of the cutter 6, the piston 17 moves to the right and hits the flange 37a of the movable member 37, causing the movable member 37 to move toward the guide rod 19, the fixed member 39a5, and the pressing member 26. At the same time, the chuck 28 is bent to the right, so that the pressing force applied to the chuck 28 is released, and the chuck 28 is moved to the right by the restoring force of the elastic member 30.

[Examples of the Invention] The present invention will be described based on Examples. As shown in FIG. 1, the chucking device for a machine tool according to the present invention includes a cup-shaped housing 5 closed by an end plate 4, and a pair of left and right bearings 15, 18 rotatably supported on the housing 5. A hollow main shaft 33 and a cylindrical portion 3 of the main shaft 33.
a fixing means C for tightening the chuck 28 consisting of a divided body supported by the conical part 3a and the conical part 40, a work fixing mechanism B for fixing the fixing means C, and a work fixing mechanism for releasing the fixing function of the work fixing mechanism 8. Function release mechanism A
It is equipped with

A main shaft 33 is rotatably supported by the left end wall of the housing 5 and the end plate 4 via a bearing 15°18.

In order to seal the bearing 15 from the outside, a labyrinth 41 is fixed to the end wall of the housing 5 with bolts 12, while a labyrinth to be combined with the aforementioned pillin 45 is integrally formed on the side wall of the drive pulley 36. This drive pulley 36 is driven via a prime mover (not shown) and the belt 13, and is coupled to the main shaft 33 with a bolt 14.

The drive pulley 36 is covered by a cover 10 fixed to the housing 5 with bolts 9.

In order to prevent dust from entering the bearing 18 from the outside, a labyrinth 34 is fixed to the end plate 4 with bolts 22, and the labyrinth 21 that engages with the labyrinth 34 is screwed onto the end of the main shaft 33.

A cover 2 is provided on the outside of the end plate 4 via a spacer 3.
can be installed.

The work fixing function release mechanism A disposed inside the housing 5 includes an actuator 6 that is fitted to the outer ring of the bearing 16 via a spacer 35 and coupled to the left end wall of the housing 5 with a bolt 8. This actuator 6 has an annular piston 17 fitted into an annular cylinder 6a. A pair of inner and outer seal members 7 are attached to the piston 17, and when fluid pressure is supplied to the cylinder 6a from the inlet and outlet port 16 of the housing 5, the piston 17
8 and is pushed to the right. spring 38
is interposed between the piston 17 and a spring support plate 24 supported by bolts 23 at the open end of the actuator 6.

The work fixing mechanism B supported by the main shaft 33 includes a movable member 37 formed by connecting at least two circumferentially divided bodies in an annular shape. A flange 37a facing the aforementioned piston 17 is integrally provided at this end, and is threadedly supported by the end of a guide rod 19 supported by the main shaft 33 so as to be slidable in the axial direction. A spring 29 is provided between the movable member 37 and the stepped portion that supports the bearing 18 at 33 degrees of the main shaft.
is interposed. Such a guide rod 19 and spring 3
At least three 9 are arranged at intervals in the circumferential direction. The right end portion of the guide O-rad 19 is firmly fitted and fixed to a fixing member 39.

The fixing member 39 is supported by the cylindrical portion 33b of the main shaft 33 so as to be openable, and a spring 25 is interposed between the main shaft 33 and the fixing member 39, but normally the force of the spring 29 described above causes the fixing member 39 to move to the left. energized.

The fixing means C for the workpiece D is constructed as follows.

A pressing member 26 having a conical hole is threadedly supported by the fixing member 39, and a pressing member 27, which is pressed inward of the main shaft 33 by the pressing member 26, is supported by the main shaft 33 so as to be openable. This pressing member 27 also has a conical hole.

The cylindrical portion 33a of the main shaft 33 is provided with a conical portion 40, which engages with the cylindrical portion 40 and the circle II portion 33a, and the right end portion is connected to the chuck 28, which is divided into three parts in the circumferential direction. The left end of the pressing member 27 is supported by an annular elastic member 30 made of rubber or the like. This elastic member 30 has a main shaft 33
This support member 31 is supported by a support member 31 fitted to the
is supported on the main shaft 33 by a nut 32 having a conical hole screwed onto the main shaft 33.

Next, the operation of the chucking device for a machine tool according to the present invention will be explained. Workpiece D is the cylindrical portion 33a of the main shaft 33.
The left end is positioned by a support member 31 fixed to the left end, and is held by the chuck 28 from the outer circumferential side. When the chuck 28 is pushed to the left by bending the elastic member 30, the chuck 28 contracts inwardly by the conical portion 40 and holds the workpiece D. chuck 28
The thrust acting on is provided by spring 29.

That is, when the movable member 37 is pushed to the left by the spring 29, the fixed member 39 is pushed to the left via the guide rod 19, and the pressing member 26 and the rotating member 33, which are screwed and fixed thereto, are movable. via the pressing member 27 supported by the
Chuck 28 is pushed to the left along cone 40.

In this way, the workpiece D fixed to the chuck 28 is
The inner surface and end surface are cut with a knife from both @ sides of 3. At this time, the chuck 28 is rotated together with the main shaft 33 by the driving pulley 36 which receives rotational force from the belt 13, and the work fixing mechanism B is also rotated.

When the turning of the workpiece D is finished and it is to be removed, the pressing force of the workpiece fixing mechanism B is released by the workpiece fixing function release R mechanism A. That is, when pressurized fluid is supplied from the inlet/outlet 16 into the interior of the 7-cut unit 6, the piston 17 moves to the right and hits the 7-lunge 37a of the movable member 37, causing the movable member 37 to move against the guide rod 19, the fixed member 39, and the pressing member. Since it is pushed to the right with 26, chuck 2
As the pressing force applied to 8 is released,
The restoring force of the elastic member 30 causes the tip 28 to move to the right. Therefore, the workpiece D can be pulled out and removed by appropriate known means.

In addition, in the embodiment described above, it is also possible to arrange the actuator 6 outside the bearings 15, 18, thereby making it possible to increase the overhang of the tool.

Further, by providing a rolling contact feature at the end of the piston 17, the fixing means C can be operated to the work fixing state or the release state while the main shaft 33 is rotating, and the VR1 time can be reduced accordingly.

[Effects of the Invention] As described above, in the present invention, the main shaft 33 is tightened and fixed by the force of the spring 29 disposed inside the main shaft 33, and no fluid pressure is used. Since there is no need for a fluid rotary joint, the mechanism is reduced to 11, which helps prevent heat generation.

In addition, since the seven cutting units 6 are disposed between the pair of bearings 15 and 18, the axial dimension of the entire device is shortened, and internal turning of relatively short cylindrical objects becomes possible.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a chucking device for a machine tool according to the present invention. 1: End plate 5: Housing 6: Actuator 6a
Niji cylinder 15.18: @Receiver 16: Outlet 17: Piston 19: Guide rod 26゜27: Pressing member 2
8: Chuck 30: Elastic member 31: Support member 33
: Main shaft 36: Drive pulley 37: Movable member 39: Fixed member 40: Conical part

Claims (3)

[Claims] (1) A workpiece fixing mechanism that is equipped with a fixing means for fixing the workpiece and rotates in conjunction with the main shaft of the machine tool, and a release means that releases the fixing function of the workpiece fixing mechanism, and the support member allows the machine tool to be fixed. A chucking device for a machine tool comprising a fixedly supported workpiece fixing function release mechanism and a pair of bearing mechanisms that support a main shaft of the workpiece fixing mechanism. (2) The fixing means presses and holds the workpiece fixing member by the restoring force of the elastic member, and the workpiece fixing function release means uses a fluid pressure actuator driven by an external fluid pressure source to restore the elastic member. A chucking device for a machine tool according to claim (1), which releases the fixing function by reducing force. (3) The workpiece fixing mechanism and the workpiece fixing function release mechanism are each configured in a cylindrical shape, the workpiece fixation function release mechanism is arranged on the outer circumferential side of the workpiece fixation mechanism, and the pair of bearings are arranged at both ends of both cylindrical parts. The chucking device for a machine tool according to claim 1, wherein the chucking device is disposed between an outer circumferential portion of the workpiece fixing mechanism and an inner circumferential portion of the workpiece fixing function release mechanism.