JPH0768406A - Face driving device - Google Patents

Abstract

PURPOSE:To complete machining in one machining process without interfering with a ground face by surely transmitting driving force from the end face of a workpiece without taking the material of the workpiece into consideration in supporting and rotatively driving the workpiece wherein the whole outer circumference is grounded. CONSTITUTION:A face driving device is provided with a spindle 2 pivotally mounted on a spindle stock 1, center 3 indexing the workpiece W fitted to the spindle 2, suction pad 7 sucked to the end face of the workpiece W installed on the side of the spindle 2, vacuum pump 10 for suck in the air in the suction pad 7, and suction passage 8 communicated in the suction pad 7 at one end and connected to the vacuum pump at the other end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface drive device for supporting and rotating a workpiece.

[0002]

2. Description of the Related Art As a conventional means for supporting and rotating a workpiece for grinding the entire outer peripheral surface thereof, one in which a blade bites into the end surface of the workpiece to transmit the driving force and transmits the rotation, The chuck grips the outer circumference of the workpiece to grind the workpiece, and the portion gripped by the chuck is ground in the next step.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There is a problem that the blade does not bite and is not driven with a hard work material (ceramic, etc.). Further, in the case of gripping with a chuck, the chuck interferes with the grinding surface, so that it is necessary to separately process the interference portion.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and includes a spindle rotatably supported by a headstock and a centering of a workpiece fitted to the spindle. A center for ejecting, a suction pad installed on the spindle side for adsorbing to the end surface of the workpiece, a vacuum pump for sucking air in the suction pad, one end communicating with the suction pad and the other end connected to the vacuum pump And a suction passage.

[0005]

Function: The workpiece is brought into contact with the center and the suction pad. Then, the air in the suction pad is exhausted by the vacuum pump through the suction passage to adsorb the suction pad to the end surface of the workpiece. During this suction process, the center of the workpiece is indexed to the center of rotation of the spindle. Then, the rotation of the spindle is transmitted to the workpiece by the suction force of the suction pad.

[0006]

Embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a headstock, and a main spindle 2 is rotatably supported on the headstock 1 via a bearing 5. A center 3 having a concave shape is integrally fitted to the tip of the spindle 2 (on the right side in the figure), and an inner peripheral surface of the center 3 is a reference formed around the end of the workpiece W. A tapered surface S2 is formed for centering the workpiece about the center of rotation of the spindle 2 when the surface S1 abuts.

A pulley 4 for transmitting the rotation of a motor (not shown) to the main shaft via a belt 11 is fixed to the rear portion (left side in the drawing) of the main shaft 2. The lid plate 18 is fixed to the rear end portion. Inside the center 3 and the spindle 2, the spindle 2
A tubular suction passage 8 is integrally fitted to the rear end of the rear end. A projection 16 is formed in the suction passage 8, and the projection 16 is fitted in a recess 17 formed in the center 3 to prevent rotation. In addition, the center 3
The screw hole 15A is provided in the screw hole 15A.
The screw 15 is screwed in. And this screw 1
By inserting the conical portion at the tip of 5 into the conical recess formed in the suction passage 8, the suction passage 8 is prevented from slipping out and prevented from rotating.

A lid plate 18 is fixed to the rear end portion of the main shaft 2, and the lid plate 18 is provided with screw holes 19A and 22A. Then, from this screw hole 19A, screw 19
Is screwed in, and the conical portion at the tip of the screw 19 is inserted into the conical concave portion of the suction passage 8 to prevent the suction passage 8 from coming off and from rotating.

At the rear part of the suction passage 8, a distributor 20 fixed to a fixed part on the headstock 1 side is arranged. The rotating shaft 21 of the distributor 20 is fitted and inserted into the cover plate 18, and the screw 22 screwed from the screw hole 22A is inserted into the conical recess of the rotating shaft 21 to be integrally connected with the cover plate 18. Has been done. An air passage 23 provided in the rotary shaft 21 communicates with the suction passage 8. Then, the rotary shaft 21 and the lid plate 18
A seal is provided between the cover plate 18 and the suction passage 8 to prevent air leakage.

The air passage 23 of the rotary shaft 21 is in constant communication with an annular groove 24 provided in the distributor 20, and the annular groove 24 is connected to the vacuum pump 10 via a switching valve 9. A cup-shaped suction pad 7 is integrally fixed to the suction passage 8 inside the center 3 at the tip of the suction passage 8 by a snap ring or the like. The suction pad 7 may be, for example, an elastic member such as resin or rubber, plastic, or the like, or is a cup-shaped metal, and resin or rubber or the like is adhered to the end surface that abuts the workpiece W to prevent air leakage. It may be one. Further, the material is not limited to these materials, and any material that achieves the purpose of adsorbing to the workpiece may be used.

A concave center 6 supported by a tailstock (not shown) is installed on the opposite side of the headstock 1. A taper surface S2 is formed on the inner peripheral surface of the center 6 by the reference surface S1 formed on the workpiece W similarly to the center 3 for centering the workpiece W around the rotation center of the spindle. There is. Next, the operation of rotating the workpiece W will be described.

The work W is installed between the centers 3 and 6, and the center 6 on the tailstock side is moved toward the headstock 1 to hold the work W between the centers 3 and 6. At this time, the reference surface S1 formed around the end portion of the workpiece W is brought into contact with the taper surface S2 of the inner surface of the center 3 so that the workpiece W moves toward the spindle 2
The heart is indexed to the center of rotation. Then, the end surface of the workpiece W is brought into contact with the suction pad 7 in the center 3.

Next, when the air in the suction pad 7 is sucked through the suction passage 8 by the vacuum pump 10, the suction pad 7 is sucked onto the end surface of the workpiece. Therefore, even if the axes of the suction pad 7 and the workpiece W are deviated at the time of adsorption, the adsorption pad 7 is bent according to the deviation, and the deviation in the radial direction is corrected. Therefore, the rotational force can be evenly transmitted to the end surface of the workpiece W.

When the main shaft 2 and the center 3 are rotationally driven by a motor (not shown) via the pulley 4, the projection 16 of the suction passage 8 and each screw 1 which engages with the recess 17 of the center 3.
The rotation is transmitted to the suction passage 8 through the rollers 5 and 19. Here, the rotating shaft 21 of the distributor 20 coupled with the cover plate 18 also rotates, but the suction force of the suction pad 7 does not change because it is always in communication with the air passage 24 by the annular groove 24. .

When the suction pad 7 is rotationally driven through the suction passage 8, the suction force of the suction pad 7 transmits the rotation to the workpiece W, so that the suction pad 7 is rotationally driven integrally with the spindle 2 and the center 3. It Then, after grinding the entire outer periphery of the workpiece W, the switching valve 9 disconnects the vacuum pump 10 from the suction pad 7, thereby releasing the suction of the suction pad 7 and separating the workpiece W.

As described above, the suction pad 7 is not limited in material, but if it is made of a metal having no elastic force, the connection portion with the suction passage 8 can be floated or the suction passage 8 can be floated. By making the material of 8 flexible in the bending direction but rigid in the twisting direction, the rotational force can be more reliably transmitted to the workpiece W.

Further, as in the second embodiment shown in FIG. 2, the suction pad 7 may be bonded to the center 3 by baking or the like to form a center integrated with the suction pad. Further, as in the third embodiment shown in FIG. 3, the center 12 may be fitted to the center of the main shaft 2, and the suction pad 7 may be attached to the main shaft 2 at the outer peripheral portion where the center 12 is fitted.

In this case, the center 12 and the suction pad 7
And a suction passage 13 for sucking the air in the suction pad 7 is formed in the main shaft 2. Then, when the vacuum pump 10 sucks the air in the suction pad 7 through the suction passage 13, the suction pad 7 is sucked to the end surface of the workpiece W on the outer periphery of the center 12 and the rotational force is transmitted.

[0019]

The surface drive device of the present invention includes a spindle rotatably supported by a spindle stock, a center fitted to the spindle for centering a workpiece, and an end surface of the workpiece installed on the spindle side. The suction pad for adsorbing to the suction pad, a vacuum pump for sucking air in the suction pad, and a suction passage having one end communicating with the suction pad and the other end connected to the vacuum pump. Even with hard ceramics, the driving force can be transmitted without biting the blade, so it is very versatile. Further, the end face of the workpiece is sucked and the driving force of the spindle is transmitted by this suction force, so that the machining can be performed in one process without interfering with the grinding surface and dividing the machining process.

[Brief description of drawings]

FIG. 1 is a sectional view of a surface drive device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a surface drive device according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a surface drive device according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Headstock 2 Spindles 3 and 12 Center 4 Pulley 5 Bearing 7 Adsorption pad 8 and 13 Suction passage 9 Switching valve 10 Vacuum pump 20 Distributor S1 Reference surface S2 Tapered surface

Claims (1)

[Claims] 1. A spindle rotatably supported by a spindle stock,
A center that is fitted to the main shaft and indexes the workpiece;
A suction pad which is installed on the spindle side and sucks on the end surface of the workpiece, a vacuum pump which sucks air in the suction pad, and a suction passage which has one end connected to the suction pad and the other end connected to a vacuum pump. And a surface drive device.