JPH10309663A - Work piecedrive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a workpiece in grinding work with one-touch operation. SOLUTION: In a workpiece drive device for supporting a workpiece W by a center 4 on a main spindle 1 side and a center 5 on a tail stock 3 side, and for rotating the workpiece W by a rotational driving means, clamp cylinders 11a, 11b for inserting one end of the workpiece W to the tip side of the main spindle 1 into the non-rotational state and provided with a non-circular part are rotatably fitted, the clamp cylinders 11a, 11b are rotated with the start of the rotational driving means, and the workpiece W inserted into the clamp cylinders 11a, 11b is driven. The clamp cylinders 11a, 11b are formed into a double structure of the clamp outer cylinder 11a and a clamp inner cylinder 11b, and therefore, different shaped workpiece W can be coped with changing only the clamp inner cylinder 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of supporting a work by a center on a spindle side and a center on a tailstock side provided in a non-rotating state, and rotating the work by a rotation driving means on the spindle side. It is used for a grinding machine for polishing the outer peripheral surface and end surface of a work and a center hole.

[0002]

2. Description of the Related Art Conventionally, in a work drive device used for a grinding machine or the like, as shown in FIG.
Bolt-shaped support pins 2 equally distributed at three places in the circumferential direction of
0a, 20b and one pressing lever 21 rotatable about a pivot 24. The pressing lever 21 is urged by a spring 23 so that its cam-shaped inner end 25 projects inside the ring 19. Let me. 22 is a pressing lever 2
1 is a contact pin used when operating No. 1.

In order to hold the workpiece W integrally with the rotary drive means on the main shaft side, each of the bolt-like support pins 20 is required.
a and 20b are appropriately rotated to protrude the tip thereof by a predetermined amount, and the pressing lever 21 is rotated from the position shown by the solid line in FIG.
In the state where the amount of protrusion of the workpiece 5 becomes small, the work W
Is inserted, and then the pressing lever 21 is returned to the original position, so that the outer peripheral surface of the work W is held in three directions by the inner end portion 25 of the pressing lever 21 and the two bolt-shaped support pins 20a and 20b. . Then, by rotating the rotation drive pin 26 of the rotation drive means in the direction of the arrow,
The work W can be rotated in the circumferential direction via the pressing lever 21 that comes into contact with the work W.

[0004]

In the above-described conventional work drive device, every time the work W is replaced, it is necessary for the operator to perform the operation of inserting and removing the bolt-shaped support pins 20a and 20b and the operation of rotating the pressing lever 21 each time. Because
The replacement work took time and effort, and the work efficiency was extremely poor.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a work drive device in which a work W can be easily attached and detached with almost one touch.

[0006]

According to the present invention, there is provided a center 4 provided on a main shaft 1 provided in a non-rotating state.
In a work drive device in which the work W is supported by the center 5 on the tailstock 3 side through the center holes Wa and Wb at both ends thereof, and the work W is rotated by the rotation driving means on the main shaft 1, the tip of the main shaft 1 At the side, clamp cylinders 11a and 11b each having a non-circular portion 12b therein for rotatably fitting one end of the work W into the non-rotation state by inserting one end of the work W into the front end portion, and activating the rotation driving means. Accordingly, by rotating the clamp cylinders 11a and 11b in the rotation direction of the rotation driving means, the work W inserted into the clamp cylinders 11a and 11b is driven.

According to a second aspect of the present invention, in the work drive device according to the first aspect, the clamp cylinders 11a,
1b has a double structure of a clamp outer cylinder 11a and a clamp inner cylinder 11b, and inserts the clamp inner cylinder 11b having a different non-circular portion 12b therein into the clamp outer cylinder 11a, and engages with the engaging pin 15 or the uneven portion. The clamp outer cylinder 11a and the clamp inner cylinder 11b are integrally formed of the clamp cylinders 11a and 11b which can be rotated by the combining means.

According to a third aspect of the present invention, in the work drive device according to the first or second aspect, the rotary drive means on the main shaft 1 side comprises: a rotary drive plate 8 rotatably fitted to the main shaft 1; A drive pin 9 is provided on the end face of the rotary drive plate 8 so as to protrude in the axial direction of the main shaft 1. The rotation of the rotary drive plate 8 is provided on the clamp cylinders 11a and 11b in a radially outward direction. The clamp pin 10 which can be brought into contact with the drive pin 9 transmits the force to the clamp cylinders 11a and 11b.

[0009]

In the work drive device according to the first aspect of the present invention, one end of the work W having the non-circular convex portion 12a is connected to the non-circular portion 12b inside the clamp cylinders 11a and 11b.
And the work W is moved to the center 4 on the spindle 1 side,
With the work being supported by the center holes Wa and Wb at both ends by the center 5 on the tailstock 3 side, the rotation driving means is activated to rotate the clamp cylinders 11a and 11b in a predetermined direction, thereby making the work W non-circular. Convex part 12a and clamp tube 1
Since the non-circular portions 12b inside 1a and 11b are engaged with each other, the non-circular portions 12b are integrally connected to each other, so that the driving means rotates and the grinding process can be performed. After inserting one end of the work W into the distal ends of the clamp cylinders 11a and 11b and supporting the work W by the center 4 on the spindle 1 side and the center 5 on the tailstock 3 side, the rotation drive means , The work W can be mounted with a single touch. In order to remove the workpiece W after the machining is completed, the rotation driving means is stopped and the clamp cylinder 1 is removed.
It is only necessary to extract the work W meshing with 1a, 11b in the axial direction.

[0010] In the work drive device according to the second aspect, even when the shape of the non-circular convex portion 12a at one end of the work W is different in the various works W, the clamp cylinder 1 can be used.
1a and 11b are the clamp outer cylinder 11a and the clamp inner cylinder 11
b, a non-circular portion 12b inside the one end of the workpiece W that can be engaged with each shape of the non-circular convex portion 12a, by replacing only the clamp inner cylinder 11b, It can correspond to various works W.

In the work drive device according to the third aspect, when the work W is mounted, the drive pin 9 is projected from the clamp cylinders 11a and 11b by rotating the rotary drive plate 8 in a predetermined direction. The workpiece W can be driven by rotating the clamp cylinders 11a and 11b in the same direction by hitting the clamp pin 10 thus set.

[0012]

FIG. 1 shows a work drive device for a grinding machine. In this figure, reference numeral 2 denotes a shank having a center 4 at the tip, and a shank taper portion 2a is fitted into a tapered hole 2b of a main shaft 1. In the state, it is fixed to the non-rotation state. The center 4 is fixed in a non-rotating state with the center tapered portion 4a fitted in the tapered hole 4b of the shank 2. 11a is a ball bearing 1 on the tip side of the shank 2.
A clamp outer cylinder 5 which is rotatably fitted to the center via a center 4 is provided at the tailstock 3 at a position coaxially opposed to the center 4 on the main shaft 1 side so as to be movable along the axis. It is. The spindle 1 is fixed to a headstock (not shown).

FIGS. 2 and 3 show the mounting state of the clamp outer cylinder 11a and the clamp inner cylinder 11b. A non-circular convex portion 12a at one end of the work W is provided on the inner periphery of the clamp outer cylinder 11a. A clamp inner cylinder 11b having a non-circular portion 11b formed therein for insertion and engagement is provided inside, and an engagement pin 15 provided on the inner periphery of the clamp outer cylinder 11a and an outer periphery of the clamp inner cylinder 11b are provided. It is engaged by the provided engagement groove 16. The engagement groove 16 is formed in an L-shape. After the engagement groove 16 of the clamp inner cylinder 11b is axially aligned with the position of the engagement pin 15 of the clamp outer cylinder 11a, as shown in FIG. By rotating the inner cylinder 11b clockwise, the engaging pin 15 of the clamp outer cylinder 11a is engaged along the L-shaped groove portion 17 of the clamp inner cylinder 11b, and the clamp inner cylinder 11b is removed in the axial direction. Is held without.

Non-circular portion 12 inside clamp inner cylinder 11b
The shape of b corresponds to the shape of the non-circular convex portion 11a at one end of each work W as shown in FIG.
Is formed slightly larger with a gap S that allows smooth insertion when it is moved in the axial direction and inserted into the clamp inner cylinder 11b.

As shown in FIG. 1, the ball bearing 14 has an annular groove 14b having a semicircular cross section formed on the inner peripheral surface of the clamp outer cylinder 11a and a semicircular groove 14b formed on the outer peripheral surface of the shank 4. It is fitted between the circular annular groove 14a. 27 is a ball insertion hole.
3 is screwed. By these ball bearings 14, the rotation of the clamp outer cylinder 11a with respect to the shank 4 can be performed smoothly.

On the other hand, on the main shaft 1, a rotary drive plate 8 is provided with a bearing 7.
A drive pin 9 is integrally provided at the tip of the rotary drive plate 8 so as to protrude in the axial direction of the main shaft 1.
The rotary drive plate 8 and the drive pin 9 constitute a rotary drive unit on the main shaft 1 side. The rotary drive plate 8
Is rotated forward and reverse by a hollow drive shaft 6 provided outside the main shaft 1. Further, a clamp pin 10 is protruded from the clamp outer cylinder 11a so as to abut against the circumferential rotation of the drive pin 9, and the clamp outer cylinder 11a is moved in accordance with the rotation of the drive pin 9. It rotates together.

In using the work drive device having the above-described configuration, the work W is gripped by a robot or the like, and one end of the work W is placed in the end portion of the clamp inner cylinder 11b in a state as shown in FIG. Insert one center hole Wa with the center 4 on the main shaft 1 side and the other center hole Wa.
After each b is supported by the center 5 on the tailstock 3 side, it is only necessary to rotate the rotary drive plate 8 counterclockwise with respect to FIG.

That is, when the rotary drive plate 8 is driven to rotate counterclockwise, the drive pin 9 integral with the rotary drive plate 8 abuts on the clamp pin 10 of the clamp outer cylinder 11a, and the clamp pin 10 clamps through the clamp pin 10. Outer cylinder 11a
Rotate in the same counterclockwise direction. The clamp outer cylinder 11a and the clamp inner cylinder 11b are engaged by the engagement pins 15, and the clamp inner cylinder 11b rotates counterclockwise,
Since the non-circular convex portion 12a of the work W and the non-circular portion 12b inside the clamp inner cylinder 11b are engaged with each other, the workpiece W is integrally connected and surely rotates. Then, by bringing the rotating grindstone 18 into contact with the work W as shown in FIG. 1, required grinding can be performed immediately.

After the grinding process is completed, when the rotary drive plate 8 is stopped, the drive pin 9 is stopped, and the clamp outer cylinder 11a is stopped.
Therefore, the non-circular convex portion 11a of the work W can be extracted in the axial direction from the non-circular portion 12b inside the clamp inner cylinder 11b engaged with the clamp outer cylinder 11a. Therefore, the work W can be immediately removed after the grinding process.

The shape of the non-circular portion 12b inside the clamp inner cylinder 11b is generally a square or rectangular shape at one end of the work W. As long as the rotation is transmitted to the work W with the rotation of the inner cylinder 11b, it is not always necessary to have the same shape, and a simple shape that is easy to process may be used.

The clamp outer cylinder 11a and the clamp inner cylinder 1
As the engaging means of 1b, other than the engaging pin 15, an engaging means having a concave-convex shape may be used as long as the clamp outer cylinder 11a and the clamp inner cylinder 11b integrally transmit rotation.

[0022]

According to the first aspect of the present invention, one end of the work is inserted into the distal end of the clamp cylinder, and the work is supported by the center of the main spindle and the center of the tailstock. Just activate the means,
The drive of the work, that is, the polishing operation can be automatically performed with one touch. In order to remove the work, the rotation driving means is stopped, and the work can be pulled out from the clamp tube and easily removed.

According to the work drive device of the second aspect, even when the shape of the holding portion of the work is different, it is possible to cope with various works simply by replacing the clamp inner cylinder.

According to the third aspect of the present invention, when the work is mounted, the rotary drive plate is rotated in a predetermined direction so that the drive pin comes into contact with the clamp pin, and the work is instantaneously rotated to polish the work. Work can begin. Then, after finishing the work, the drive can be automatically released almost at the same time as the stop of the rotary drive plate, so that the working efficiency can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a work drive device according to an embodiment of the present invention.

FIG. 2 is a partially sectional side view showing a state of the clamp cylinder of the present invention.

FIG. 3 is a sectional view taken along line YY of FIG. 2;

FIG. 4 is a sectional view taken along line XX of FIG. 1;

FIG. 5 is a cross-sectional view showing a conventional work drive device.

[Explanation of symbols]

 Reference Signs List 1 spindle 2 shank 3 tailstock 4 center on tailstock side 5 center on tailstock side 8 rotary drive plate 9 drive pin 10 clamp pin 11a clamp outer cylinder 11b clamp inner cylinder 14 ball bearing 15 engagement pin W work

Claims (3)

[Claims] 1. A work is supported by a center on a spindle side provided in a non-rotating state and a center on a tailstock side through center holes at both ends thereof, and the work is rotated by rotation driving means on the spindle side. In the work drive device, a clamp cylinder having a non-circular portion inside is rotatably fitted to a tip end side of the main shaft so that one end of a work is inserted into a tip end portion to be in a non-rotation state. A work drive device configured to drive a work inserted into a clamp tube by rotating a clamp tube in a rotation direction of the rotation drive unit in accordance with activation of the rotation drive unit. 2. The clamp tube has a double structure of a clamp outer tube and a clamp inner tube, and inserts a clamp inner tube having a different non-circular portion into the clamp outer tube, and engages with a pin or an uneven portion. 2. The work drive device according to claim 1, wherein the clamp outer cylinder and the clamp inner cylinder are integrally formed of a rotatable clamp cylinder by the means. 3. The rotation drive means on the spindle side comprises: a rotation drive plate rotatably fitted to the spindle; and a drive pin protruding from an end face of the rotation drive plate in an axial direction of the spindle. 3. The rotation of the rotary drive plate according to claim 1 or 2, wherein the rotation of the rotation driving plate is transmitted to the clamp cylinder by a drive pin projecting outward in a radial direction from the clamp cylinder and capable of contacting the drive pin. Work drive device.