JP2507878Y2 - Workpiece holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a work holding device for fixing and driving a work, which is an assembly component, in an assembly machine such as a lathe.

[Conventional technology]

Usually, for machining with a lathe, a chuck is attached to the rotary spindle of the lathe, and the workpiece is held on the chuck.
Machining is performed by rotating the workpiece together with the spindle.
Therefore, the shape of the work piece must be able to be held by the chuck, and as a result, when making one assembly, each part is held on the lathe for machining, and after the machining is finished, The current situation is to make one assembly by sequentially combining each part.

[Problems to be solved by the invention]

In recent years, components used in computer-related equipment, OA equipment, VTRs, etc. are required to be small and highly accurate.

However, in manufacturing and assembling those parts, each part of the part is individually machined, that is, machined, and then each part is assembled. Even if processed at the submicron level, by assembling each part,
Since the machining error appears as a cumulative error, it is often found that when the parts are assembled into the final product, the machining accuracy of each part exceeds the permissible error, resulting in high rotational accuracy. There was a problem because I could not satisfy the request.

Regarding the above-mentioned processing, as a measure to prevent cumulative error in assembly, it is conceivable to perform the final finishing processing in the state where each part is combined (the state of the final product) to improve the processing accuracy. There is a problem that the shape in the combined state is a shape that can be chucked by a machine tool such as a lathe, and the degree of freedom in design is limited.

An object of the present invention is to solve the above-mentioned problems, and a workpiece in a state where a shaft member and an outer member, which are each part, are assembled so as to be rotatable relative to each other, is capable of being rotated around a shaft member as a lathe. Lathes that can be held on the assembling machine, which gives a great degree of freedom in the shape of the work piece after assembling each part, and can improve the processing accuracy of the assembly as the final product. To provide a work holding device in a group processing machine.

[Means for solving problems]

This invention is configured as follows in order to achieve the above object. That is, according to the present invention, by holding the shaft member of a workpiece including the shaft member and the outer member rotatably supported by the shaft member, the outer member is machined for machining the outer member. In a work holding device rotatably supported by a shaft member, a clamp base having a fitting groove for mounting the shaft member on its rotation center axis and fixed to a fixed housing, and a central hole formed in the clamp base. A clamp member that is fixedly fitted in the stepped portion in the axial direction and that positions the end portion of the shaft member in the abutting state.
A clamp pressing member integrally provided on the clamp member so as to be swingable and provided on an outer surface on an inclined surface, slidably supported by a clamp guide fixed to the fixed housing, and an end portion of the clamp pressing member. A clamp rod having an inclined surface capable of contacting the inclined surface, an actuator for moving the clamp rod forward and backward along the clamp guide, and an outer member attached to the fixed housing via a bearing. By driving the clamp rod forwards and backwards by the actuator to bring the inclined surface of the clamp rod into contact with the inclined surface of the clamp pressing member to swing and displace the clamp pressing member. Abuts the clamp base and presses the end portion of the shaft member placed in the fitting groove to fix it in a clamped state. About workholding apparatus characterized by the disengaging.

Further, in this work holding device, the drive means is composed of a drive pulley, a drive face plate fixed to the drive pulley, and a drive pin attached to the drive face plate and capable of being locked to the outer member of the workpiece. It has been done.

[Action]

The work holding device according to the present invention is configured as described above and operates as follows. That is, this work holding device is provided in a fixed housing in which the shaft member of a workpiece of an assembly having a rotation function, which is composed of a shaft member and an outer member rotatably supported by the shaft member, is fixed around the shaft center. Since the clamp base provided and the clamp pressing member of the clamp member are fixed in a sandwiched state, and the outer member is rotated by the drive means attached to the fixed housing via a bearing, the above-mentioned structure is provided in the assembled state. The outer member can be machined by rotating the outer member by a driving means with the shaft member as a rotation reference, and the outer member can be machined with high precision. The processing accuracy of the assembly as the final product can be improved.

Further, since the workpiece is held by using a clamp rod that can move back and forth, instead of using an ordinary chuck, it is possible to give the workpiece a considerable degree of freedom. Becomes

〔Example〕

An embodiment of a work holding device in a machine tool such as a lathe according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a work holding device according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the work holding device of FIG.

This work holding device 1 mainly comprises a clamping means 2 for clamping a work 20 of an assembly part having a rotating function.
And a driving means 3 for rotationally driving the workpiece 20. The clamp means 2 is arranged in a fixed housing 6 fixed to a shaft center component of a lathe or other assembling machine.
Clamp rod 10, actuator 4 such as fluid pressure or solenoid for moving the clamp rod 10 back and forth, and clamp rod
It consists of a clamp member 11 which can fix or release the shaft member 30 of the work piece 20 by the forward and backward movement of 10.

A hollow fixed housing 6 is fixed by a bolt 7 to a jig base 5 of an assembly machine such as a lathe. A clamp guide 8 and a clamp base 9 are fitted in the fixed housing 6. The clamp base 9 includes a stopper portion 35 formed at the end of the fixed housing 6 and a clamp guide 8.
It is located between and fixed. The clamp guide 8 is fixed to the fixed housing 6 with a bolt 14, and the clamp guide 8 is fixed with an actuator 4 such as a fluid pressure or a solenoid with a bolt 15.

A clamp rod 10 is fixed to a movable member of the actuator 4, and the clamp rod 10 slidably penetrates a guide hole 37 formed in the clamp guide 8 and a central hole 38 of the clamp base 9.

Further, an inclined surface 16 is formed at the tip of the clamp rod 10. The clamp member 11 is fixedly fitted in the step portion 39 of the central hole 38 of the clamp base 9, so that the clamp rod 10 is fitted in the central hole 38 of the clamp base 9.
The clamp rod 10 and the clamp member 11 are fitted to each other so as to be slidably movable on the clamp rod 11.

A notch groove 19 is formed in the clamp member 11 so as to form a clamp pressing member 17 which can be swung or displaced in the radial direction. Further, the clamp pressing member 17 of the clamp member 11
A slanted surface 18 is formed on the outer surface of the slanted surface, and the slanted surface 18 is in contact with the slanted surface 16 at the tip of the clamp rod 10. A screw 36 is formed on the outer peripheral surface of the end of the fixed housing 6, and a bearing holding nut 12 is screwed into the screw 36 to fix the inner race of the bearing 13 to the fixed housing 6.

The driving means 3 for rotationally driving the workpiece 20 of the workpiece holding device 1 is arranged on the outer periphery of the fixed housing 6 of the clamping means 2 via a bearing 13, and mainly comprises a driving pulley 21,
A drive face plate fixed to the drive pulley 21 via a mounting rotor 23
25 and a drive pin 27 attached to the drive face plate 25. The drive pin 27 is configured to be engageable with a pin fitting hole 28 formed in the outer member 31 of the workpiece 20 (see FIG. 2). The drive pulley 21 is fixedly fitted to the outer race of the bearing 13, and therefore the drive pulley 21 is rotatably attached to the fixed housing 6. The drive belt 22 driven by an appropriate drive source is hung on the outer peripheral surface of the drive pulley 21.
Is driven to rotate by the drive belt 22.

In FIG. 2, the workpiece 20 is shown fixed to the workpiece holder 1 and held so that it can be driven to rotate. The work piece 20 includes a shaft member 30 and an outer member 31 which are relatively rotatable via a bearing 32. Outer member
A pin fitting hole 28 into which the drive pin 27 attached to the drive face plate 25 is fitted is formed in the 31. Shaft member of workpiece 20
30 is clamped and fixed between the clamp pressing member 17 and the clamp base 9.

Moreover, the shaft member 30 of the workpiece 20 is installed so that the rotation center axis of the shaft member 30 is located in the fitting groove 40 of the clamp base 9, as shown in FIG. 3, and is fixed extremely firmly. In the figure, reference numeral 24 is a bolt for fixing the drive pulley 21 and the mounting rotary body 23, 26 is a bolt for fixing the mounting rotary body 23 and the drive face plate 25, 29 is a fitting central hole formed in the drive face plate 25,
Reference numeral 33 denotes a tool, and 34 denotes a tool rest to which the tool 33 is fixed.

Next, a usage mode of the work holding device 1 will be described. When attaching the workpiece 20 to the workpiece holding device 1 of a lathe or other assembly machine, first, the shaft member of the workpiece 20 is attached.
30 through the fitting center hole 29 of the drive face plate 25
The drive pin 27 attached to the work piece 20 is aligned with and fitted into the drive hole, that is, the pin fitting hole 28 of the workpiece 20. Shaft member 30 of workpiece 20
Is placed in the fitting groove 40 of the clamp base 9, and the tip end of the shaft member 30 of the workpiece 20 is positioned so as to be in contact with the clamp member 11 (see FIG. 3). In this case, the mounting reference of the workpiece 20 is configured to be in the axial direction of the clamp member 11.

The fluid pressure is then applied to the actuator 4 such as a solenoid.
To move the clamp rod 10 forward. By the forward movement of the clamp rod 10, the inclined surface 16 formed on the tip end of the clamp rod 10 presses the inclined surface 18 formed on the outer surface of the clamp member 11, and the clamp pressing member 17 of the clamp member 11 is directed downward. As shown by the arrow, the shaft member 30 of the work 20 is pushed down, that is, oscillated and displaced downward in the figure, and is clamped between the clamp base 9 and the clamp pressing member 17 to be fixed.

As described above, the work piece 20 is fixed to the clamp means 2, and the outer member 31 of the work piece 20 is rotationally moved as follows. The drive belt 22 is rotated by, for example, a drive motor (not shown), and the rotational force is transmitted to the drive pulley 21. Due to the rotational movement of the drive pulley 21, the drive face plate 25 fixed to the drive pulley 21 via the mounting rotating body 23 rotates,
Next, the outer member 31, which is the rotating body of the workpiece 20, rotates via the drive pin 27 attached to the drive face plate 25. Outer member 31
While the tool is rotating, the tool rest 34 is moved and the outer surface of the outer member 31 of the workpiece 20 is turned by the tool 33.

[Effect of device]

The work holding device according to the present invention is configured as described above and has the following effects. That is, in this work holding device, a clamp base having a fitting groove for fixing a shaft member of a work of an assembly part having a rotation function to a rotation center axis thereof is disposed in a fixed housing, and the fixed housing is provided with the clamp base. Since the outer member is rotated by the driving means attached via the bearing, it becomes possible to set the assembled workpiece on a lathe or other assembling machine,
The outer member of the workpiece can be machined in the assembled state, the cumulative error due to the assembly of each part can be prevented from increasing, and the precision finishing can be performed, and the rotation with respect to the rotation axis can be performed. The runout accuracy of the body, i.e., the outer member, can be greatly improved, and therefore, the outer member, i.e., the outer rotating body, can be turned with extremely high accuracy.

For example, conventionally, with respect to a component having a rotating function which is a component of a VTR, the housing of the bearing was fixed and the shaft system was drive-processed, but in this work holding device, the shaft system is fixed and the housing system, that is, the outside. The member can be drive machined. Further, since the work is held by using a clamp rod that can move back and forth, instead of using an ordinary chuck, it is possible to give a considerable degree of freedom to the shape of the work. Becomes

Moreover, even if the workpiece cannot be held by a normal chuck, this workpiece holding device can fix various workpieces by replacing the clamp base and the clamp member with appropriately modified ones. The object can be held ready for turning or machining.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a work holding device according to the present invention, FIG. 2 is an enlarged cross-sectional view of an essential part of the work holding device shown in FIG. 1, and FIG. FIG. 1 ... Work holding device, 3 ... Driving means, 4 ... Actuator, 6 ... Fixed housing, 8 ... Clamp guide, 9 ... Clamp base, 10 ... Clamp rod, 11 ...
Clamping member, 13 …… Bearing, 16,18 …… Slope, 17 ……
Clamp pressing member, 20 …… Workpiece, 21 …… Drive pulley,
25 …… Drive face plate, 27 …… Drive pin, 28 …… Pin fitting hole,
30 …… Shaft member, 31 …… Outer member, 38 …… Center hole, 39 ……
Step, 40 …… Mating groove.

Claims (2)

(57) [Scope of utility model registration request] 1. A shaft member and an outer member rotatably supported on the shaft member. By holding the shaft member of a workpiece, the outer member is machined to machine the outer member. A workpiece holding device rotatably supported by a member, comprising: a clamp base having a fitting groove for mounting the shaft member on its rotation center axis and fixed to a fixed housing; and a central hole formed in the clamp base. A clamp member axially fixedly fitted to the step portion and for positioning the end portion of the shaft member in an abutting state, provided integrally with the clamp member so as to be swingable, and provided with an inclined surface on the outer surface. A clamp pressing member, a clamp rod slidably supported by a clamp guide fixed to the fixed housing, and an end portion having a sloped surface capable of contacting the sloped surface of the clamp pressing member, and the clamp. An actuator for slidably advancing and retracting the rod along the clamp guide, and a drive means mounted on the fixed housing via a bearing and rotating the outer member are provided, and the clamp rod is advanced and retracted by the actuator. By contacting the inclined surface of the clamp rod with the inclined surface of the clamp pressing member and swinging and displacing the clamp pressing member to abut the clamp base and mount the shaft in the fitting groove. A workpiece holding device, characterized in that the end portion of the member is pressed to fix or release it in a sandwiched state. 2. The drive means comprises a drive pulley, a drive face plate fixed to the drive pulley, and a drive pin attached to the drive face plate and lockable to the outer member of the workpiece. The work holding device according to claim 1, characterized in that