JP2526253Y2 - Work drive device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which a work having a concave or convex surface such as a cam on one end surface is provided on a main shaft of a machine tool such as a grinding machine, and a plurality of vertexes of the concave and convex surface in the axial direction and a center hole are formed. The present invention relates to a work drive device that drives as a reference.

[0002]

2. Description of the Related Art Conventionally, when a workpiece W having an end face formed on a cam WC as shown in FIG. 2 is simultaneously ground with an outer diameter Wd and an end face on the basis of a center hole Wa, as shown in FIG. The center 102 of the work W is pressed against the center hole Wa of the work W, and the center of the rear end face of the work is pressed by the front end face of the tailstock center 103, and the screw 1 for fixing to the drive plate 104.
The work W is rotated by detachably inserting the pin at the end of the work 05 into the drive hole Wb of the work, and the outer diameter Wd and the end face We are simultaneously ground.

[0003]

[Problem to be Solved by the Invention] The conventional method of simultaneously grinding the outer diameter and the end face of the work by supporting the center hole at the spindle center can guarantee the perpendicularity of the cam surface with respect to the axis of the work. In addition, there is a problem that the axial position changes depending on the size of the center hole and the thickness of the work becomes uneven. The present invention has been made in view of the above-mentioned problems of the prior art, and the object thereof is to determine a plurality of vertices of a cam in the axial direction regardless of the quality of the center hole. It is an object of the present invention to provide a work drive device capable of simultaneously and precisely grinding the outer diameter and the opposite end face.

[0004]

In order to achieve the above object, a work drive device according to the present invention is a work drive device driven by a drive pin with reference to an axial position of one end face of a work and a center hole. A center is provided on a socket having a reference end face which is provided concentrically with the tip end of the main spindle and which comes into contact with the one end face. The center is movable only in the axial direction and is always urged by a first spring. The drive pin, which is always urged to project and is detachably inserted into the drive hole of the work in a detachable manner, is provided in parallel with the spindle axis, and is always projected by a third spring stronger than the first spring. An elastic member is provided at the tip of the tailstock shaft to be rotated, which is rotatable and coaxial with the tip of the rotating shaft, to absorb the vibration of the center of the other end surface of the work. A.

[0005]

[Function] When the work is placed on the work cradle with the small diameter pin at the tip of the drive pin facing the drive hole of the work and the start switch is pressed to advance the tailstock, the tailstock moves forward. The elastic member at the tip of the rotating shaft comes into contact with the center of the other end surface of the work, and pushes the center against the force of the first spring to move the work toward the main shaft. Then, when one end face of the work comes into contact with the reference end face of the socket and stops,
A drive pin insertion confirmation signal is output, and the grinding process starts.

[0006]

An embodiment will be described with reference to FIGS. In an angle slide type cylindrical grinding machine, a spindle 2 is rotatably supported on a headstock 1 provided on a table (not shown), and a tapered shank socket having a flange 3a at a tip end in a tapered hole at the tip of the spindle 2. 3 is detachably fitted. Work W is attached to the tip of the flange 3a of the socket.
A reference end face ring 4 for axial positioning is fixed concentrically, and a center 5 is inserted into a center hole of the socket 3 so as to be movable only in the axial direction, and is urged by a spring 6 to protrude.

Further, a drive pin 7 having a small-diameter pin 7a at the tip inserted into the drive hole Wb of the work is provided on the flange 3a of the socket 3 so as to be movable in the axial direction parallel to the main shaft axis. Concentric with the rear end face of the flange 3a,
A spring receiving ring 9 is fixed concentrically via a plurality of spacers 8. The dog ring 12 is movably provided with the spacer 8 as a guide, and the drive pin 7 is always urged to project by a spring 11 stretched between the dog ring 12 and the spring receiving ring 9. The ring 12 moves with the drive pin 7 in the axial direction. A drive pin engagement confirmation proximity switch LS1 is attached to the fixed portion at a position corresponding to the dog ring. Furthermore, the fixed position stopping plate 13 is provided on the spindle 2.
Are fixed concentrically, and a dog 14
Is fixed so that the mounting position can be changed.

On the other hand, on the tailstock 15 fixed on the table,
The tailstock shaft 16 is fitted so as to be movable in the axial direction. The tailstock shaft 16 is always urged to protrude by a spring 17 and is retracted by a hydraulic cylinder (not shown). A rotation center 18 is removably fitted in a tapered hole of the tailstock 16, and a plurality of bearings 2 are mounted on a main body 19 of the rotation center 18.
1, the rotation shaft 22 is rotatably supported. A pad 23 made of an elastic material such as urethane rubber is concentrically fixed to the end surface of the rotating shaft 22. Further, the above-mentioned center 5
The spring 6 used for the tailstock 16 has a lower spring force than the spring 17 for the tailstock 16.

On the other hand, with respect to the spindle axis fixed on the bed, 6
A grindstone table (not shown) is movably mounted on a guide table (not shown) having a guide surface inclined at 0 °, and a grindstone shaft unit 25 is fixed to the grindstone table. The grindstone shaft 26 is rotatably mounted on the grindstone shaft unit, and a grindstone 28 is attached to the tip of the grindstone shaft 26 via a grindstone flange 27. Further, a work receiving table 29 is mounted on the table.

Next, the operation of the present embodiment will be described.
The workpiece W is held in a state where the small-diameter pin 7a faces the drive hole Wa at the tip of the drive pin 7 of the holder 3 that is inserted into the main shaft 2 stopped at the fixed position and is always urged to protrude by the spring 11. When it is placed on the work cradle 29 and the start switch is pressed, the tailstock shaft 16 moves forward by the force of the spring 17,
The center of the workpiece end face is pushed by the pad 23 at the tip of the rotating shaft 22, the center 5 is retracted against the force of the spring 6, and the workpiece W
Moves toward the main spindle side in the axial direction, and a plurality of vertexes of the end face cam Wc abut on the reference end face ring 4 and stop. In this state, the center hole Wa of the work W is supported by the center 5, the center of rotation is determined, and the apex of the cam Wc abuts the ring 4 on average to determine the axial reference position.

When the work W is supported in this way, the proximity switch LS1 for confirming the insertion of the drive pin is turned on to start a grinding process, the main shaft 3 is rotated, and the grindstone head moves forward.
The outer periphery Wd and the end surface We of the work W are ground at the same time, and when a predetermined size is reached, the grindstone head retreats, and the grinding process ends. Next, when the main shaft 2 stops at a fixed position and the tailstock shaft 16 is retracted by the hydraulic cylinder against the force of the spring 17, the center 5 advances by the force of the spring 6, and the work W is pushed out, and the work W The pad 23 is placed on the table 29 and separates from the workpiece W. The pad 23 is for absorbing the deflection of the pressing portion at the center of the end face of the workpiece, and is not limited to the pad made of an elastic material such as urethane rubber, but may be a floating mechanism that can follow the deflection of the pressing portion. Of course, any can be used.

[0012]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. A socket is mounted on the tip of a rotatable main shaft, a center is provided on the socket that can move axially and is urged by a spring, and a small-diameter pin is detachably inserted into a drive hole of a work. A drive pin is provided, and the center hole of the work is pressed against the center by the elastic member provided on the end face of the rotation shaft of the rotation center mounted on the tailstock shaft, and at the same time, the work end face is pressed against the axial reference end face provided on the socket. As a result, the run-out of the end face pressed by the tailstock shaft of the work is absorbed by the pad, so that the end face can accurately contact the reference surface of the socket, and can be reliably supported on the basis of the center hole. Thus, efficient and accurate grinding can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a work drive device according to the present embodiment as viewed from above.

FIG. 2 is a perspective view of a workpiece.

FIG. 3 is a top sectional view of a conventional work drive device.

[Explanation of symbols]

2 Main shaft 3 Socket 4 Reference end face ring 5 Center 6, 11, 17 Spring 7 Drive pin 12 Dog ring 16 Tailstock shaft 22 Rotating shaft 23 Pat LS1 Proximity switch W Work Wa Center hole Wb Drive hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A work drive device driven by a drive pin with reference to an axial position of one end face of a work and a center hole as a reference, having a reference end face provided concentrically with a tip end of a rotatable main shaft and contacting the one end face. The socket is provided with a center movable only in the axial direction and constantly biased by the first spring.
The drive pin, which is constantly urged by a spring and whose tip is detachably fitted into the drive hole of the work, is provided in parallel with the spindle axis, and is constantly projected by a third spring stronger than the first spring. A work drive device comprising: an elastic member that absorbs vibration of a center portion of the other end face of the work at a rotatable and concentric end of a rotating shaft at a tip of a tailstock shaft to be urged.