JPH0613816Y2 - Work peripheral groove indexing grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a grinding device for indexing and grinding a circumferential groove of a work such as an inner race of a constant velocity joint.

[Prior Art] Conventionally, in a grinding device for indexing and grinding a circumferential groove of a work such as an inner race of a constant velocity joint, a work holder is mounted between opposed spindles of a pair of headstocks which are opposed to each other. The workpiece holder is provided with a concave portion for holding the workpiece, and the clamp means for fixing the workpiece is provided. Indexing means are provided for indexing. On the other hand, a grinding wheel is attached to a grindstone shaft parallel to the spindle axis of a grindstone base that moves forward and backward perpendicularly to the spindle axis.

Then, indexing by indexing means, rotation of the opposing main shaft,
Grinding work is performed by repeatedly moving the wheel head forward and backward.

[Problems to be Solved by the Invention] In a conventional grinding device for indexing and grinding a circumferential groove of a workpiece such as an inner race of a constant velocity joint, the grinding device is performed every time a pair of circumferential grooves on a diameter line is ground. During the indexing operation, the grinding wheel head must be retracted so that the grinding wheel is out of the interference area with the workpiece being indexed. for that reason,
The time required for advancing / retreating the whetstone for the number of times indexed is wasted,
Work efficiency is poor.

This invention is intended to eliminate the above-mentioned poor work efficiency.

[Means for Solving Problems] A workpiece circumferential groove indexing and grinding device for indexing and grinding a circumferential groove of a workpiece according to the present invention is a headstock that rotatably supports a spindle, and a workpiece mounted on the spindle. Holder, indexing device for rotating and indexing the workpiece on the workpiece holder around a line perpendicular to the spindle axis, fixing device for fixing the workpiece to the workpiece holder,
Spindle rotation drive device, spindle drive control device that controls the spindle rotation drive device to stop the rotation of the spindle at a fixed position around the spindle axis where the workpiece does not interfere with the grinding wheel when indexing the workpiece, and the indexed work It is composed of a grindstone wheel facing the object and a grindstone base provided with a driving means for driving the workpiece back and forth.

[Operation] First, the work piece is mounted at a predetermined position of the work piece holder, and then the main shaft is rotated by the drive device, and at the same time, the grinding wheel head, that is, the rotationally driven grinding wheel is cut and advanced to make a pair on the diameter line. Grind the circumferential groove.

After grinding is completed, with the grinding wheel stopped at the cutting position, the spindle driving control device controls the spindle driving device so that the spindle is in a fixed position, that is, the workpiece is in contact with the grinding wheel whose circumferential groove is in the cutting cutting position. The rotation is stopped at the fixed rotation position where it does not match.

After that, the fixing device is released so that the workpiece can be rotated on the workpiece holder, the workpiece is rotationally indexed by the indexing device, and the workpiece is fixed to the workpiece holder again by the fixing device, and then again. The main shaft is driven to rotate to grind another circumferential groove.

The same grinding action as described above is repeated, and the adjacent circumferential grooves are sequentially ground, and the grinding of all circumferential grooves of one workpiece is completed.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an outline of a grinding device for index grinding of a circumferential groove Wc of a work W such as an inner race of a constant velocity joint which is an embodiment of the present invention. On the table 1 on the base, a pair of headstocks 4 and 5, in which spindles 2 and 3 are rotatably supported, are installed opposite to each other, while on the base, a grindstone parallel to the spindle axis is also provided. A grindstone wheel 6 is mounted on the shaft, and a grindstone base (not shown) that moves forward and backward perpendicularly to the spindle axis is installed.

One main shaft 2 is rotationally driven by the drive motor 7 through the gear train 8, and the other main shaft 3 is also rotationally driven by the drive motor 7 through the synchronous shaft 9 and the gear train 10 in synchronization with the main shaft 2. It has become.

A dog 11 is fixedly attached to the rear end of the spindle 2 protruding from the spindle stock 4, and a detector 12 is attached to the table 1 by a bracket (not shown) at a position opposed to the dog 11, and the dog 12 is provided for each revolution of the spindle 2. The rotation phase of the dog 11, that is, the spindles 2 and 3, is detected, and a detection signal is sent to the drive motor control device,
The rotary positioning is stopped at a fixed position.

As shown in FIG. 4, the fixed position is such that the circumferential groove portion of the inner race of the constant velocity joint, which is the workpiece W held on the reference plate 22a described later, does not engage with the grinding wheel 6 at the grinding cutting position. This is the angular position in which the workpiece W can be indexed on the reference plate 22a in a state where the indexing rotation of the workpiece is not interfered with by the grinding wheel 6 in the grinding cutting position.

The workpiece holder 13 is formed at the tips of the respective spindles 2 and 3,
The protrusions 14 and 15 are mounted so as to be mounted between the protrusions 14 and 15 spaced apart from the thickness of the grinding wheel 6, and the protrusions 15 are fixed by bolts 16 and protruded. Department
In 14, to allow expansion displacement in the direction of the spindle axis,
There are clearances 18 and 19 for the base of the protruding portion 14 and the bolt hole 17, and they are attached by a bolt 21 via a disc spring 20.

A circular recess 22 that engages with the workpiece W is provided in the upper portion of the workpiece holder 13, and a reference plate 22a on which the workpiece W is rotatably and slidably mounted is installed in the circular recess 22. There is. On the peripheral wall of the circular recess 22 on the spindle 3 side, there is formed a reference arc surface 23 that serves as a mounting reference for the peripheral surface of the workpiece W. or,
The workpiece holder 13 is provided with a grinding wheel 6 when rotating around the spindle axis.
A circumferential groove 24 is provided so as not to interfere with the.

Hydraulic cylinder in the tangential direction of the workpiece W on the workpiece holder 12
The spindle 2 is provided with an indexing device 26 for moving the workpiece W forward and backward and engaging and disengaging with the circumferential groove Wc of the workpiece W, and for rotating and indexing the workpiece W around a line perpendicular to the spindle axis. There is. Then, the hydraulic cylinder 28 provided on the main shaft 2 moves back and forth with respect to the reference circular arc surface 23 formed on the circular recess 22.
A reference knock 29 is slidably supported on a support base 30 on the workpiece holder 12 so as to be engaged with and disengaged from the circumferential groove of the workpiece W. The advancing / retreating axis of the reference knock 29 passes through the center of the workpiece W when the peripheral surface contacts the reference arc surface 23.

The work clamps 31 and 32 are installed on the respective spindles 2 and 3, so that the work clamp 31 on the spindle 2 side is
The workpiece W is held in the circular recess 22 of the workpiece holder 12 by the pressing claw 34 attached to the piston tip of the hydraulic cylinder 33 provided in the workpiece holder 12.
The work clamp 32 on the spindle 3 side is actuated by two hydraulic cylinders 35, 36 provided on the spindle 3 via a link mechanism. The work W is pressed against the reference plate 22a on the bottom surface of the circular recess 22 of the work holder 12 by the pressing claw 37.

The operation and operation of the index grinding device will be described.

Initially, the pressing claws 34, 37 of the work clamps 31, 32 are in the released position, and the circular recess 22 of the work holder 13 is oriented upward.

First, the workpiece W is loaded on the reference plate 22a of the circular recess 22 of the workpiece holder 13, the hydraulic cylinder 28 is operated, and the reference knock 29 is brought into contact with one of the circumferential grooves Wc to move the workpiece peripheral surface. The workpiece W is indexed and positioned by pressing it against the reference arc surface 23.
At this time, the other one circumferential groove Wc is located at a position facing the grinding wheel 6.

Then, the hydraulic cylinder 33 is operated and the work piece W is pushed by the pressing claw 34.
Is pressed against the bottom surface of the circular recess 22 and the circular arc surface 23, and then the hydraulic cylinders 35 and 36 are driven to press the work W toward the bottom surface of the circular recess 22 with the pressing claw 37, The hydraulic cylinder 28 is operated to retract the reference knock 29. Thus, the workpiece W is mounted on the workpiece holder 13 at a predetermined position.

Then, the main shafts 2 and 3 are rotated by the drive motor 7 via the gear trains 8 and 10 and the synchronous shaft 9, and the grinding wheel head, that is, the rotationally driven grinding wheel 6 is cut and advanced to make a pair of circumferences on the diameter line. Grind the groove.

After grinding, with the grinding wheel 6 stopped at the cutting position,
When a stop command is given to the drive motor 7, the rotational phase of the dog 11, that is, the main shafts 2, 3 is detected by the detector 12, and the drive motor 7, that is, the main shafts 2, 3 is operated by the detector 12 by the detection signal. The circumferential groove portion as shown in FIG. 4 is stopped at the rotation fixed position where it does not engage with the grinding wheel at the cutting cutting position.

After that, when the work clamps 31 and 32 are loosened and the hydraulic cylinder 25 is operated to move the indexing pawl 26 forward and backward, the work W is disengaged from the circumferential groove of the work W by the engagement and disengagement of the indexing pawl 26. One groove is divided and rotated on the reference plate 22a in the circular recess 22.

Then, the hydraulic cylinder 28 is activated again and the reference knock is performed.
29 is brought into contact with one of the circumferential grooves to index and position the workpiece W, and the same grinding action as described above is repeated to successively grind the adjacent circumferential grooves. Thus, when the grinding of the entire circumferential groove of one workpiece is completed, the grindstone head is retracted and the workpiece is replaced.

Even if the spindles 2 and 3 expand or contract due to temperature change, the spindle 2
Relative sliding is allowed between the workpiece holder 13 and the workpiece holder 13, the workpiece holder 13 is not affected, and the reference knock 29 is attached to the support base 30 on the workpiece holder 13. Therefore, the positional relationship with the reference arc surface is always maintained constant, and the accuracy of index positioning of the workpiece W by the reference knock 29 can be secured.

[Effects of the Invention] In the grinding device for indexing and grinding the circumferential groove of the work such as the inner race of the constant velocity joint according to the present invention, the grinding wheel is operated during the indexing operation performed every time the circumferential groove of one circumference is ground. The stone head must be retracted so that it is out of the interference zone with the workpiece being indexed. Therefore, the time required to move the whetstone back and forth by the number of times of indexing is wasted, resulting in poor work efficiency.

This invention is intended to eliminate the above-mentioned poor work efficiency.

[Brief description of drawings]

1 is a front view of an indexing and grinding apparatus of an embodiment of the present invention, FIG. 2 is a plan view of a work holder in the indexing and grinding apparatus of FIG. 1, and FIG. 3 is a view of FIG. A sectional front view taken along line III-III, and FIG. 4 are sectional side view partial views showing the positional relationship between the workpiece and the grinding wheel during grinding. 1 …… table, 2,3 …… spindle 4,5 …… spindle base, 6 …… grinding wheel 7 …… drive motor, 8,10 …… gear train 9 …… synchronous shaft, 11 …… dog 12 …… Detector, 13 …… Workpiece holder 14,15 …… Projection, 16,21 …… Bolt 17 …… Bolt hole, 18,19 …… Free play 20 …… Disc spring, 22 …… Circular recess 22a… … Reference plate, 23 …… Reference arc surface 24 …… Circumferential groove 25, 28, 33, 35, 36 …… Hydraulic cylinder 26 …… Indexing claw, 27 …… Indexing device 29 …… Reference knock, 30 …… Supporting stand 31,32 …… Workpiece clamp, 34,37 …… Pressing claw W …… Workpiece, Wc …… Circular groove

Claims (1)

[Scope of utility model registration request] 1. A headstock that rotatably supports a main spindle, a work holder attached to the main spindle, an indexing device for rotationally indexing a work on the work holder around a line perpendicular to the main spindle axis,
A fixing device for fixing the workpiece to the workpiece holder, a spindle rotation drive device, and a spindle rotation drive device to stop the spindle rotation at a fixed position around the spindle axis line where the workpiece does not interfere with the grinding wheel when indexing the workpiece. Workpiece for indexing and grinding a circumferential groove of a workpiece, which is composed of a spindle drive control device for controlling, a grinding wheel facing a workpiece positioned for indexing, and a grinding wheel head having a driving means for driving the workpiece forward and backward. Circumferential groove indexing grinder