JPH0144297Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing jig for a workpiece, and more particularly to a processing jig for grinding the shaft of a workpiece having radially arranged axes.

Products with multiple shafts arranged radially around the main body are used in fields such as planetary gears and transmissions. The shaft of this type of product is usually ground, and for this purpose a processing jig is required that can easily center the shaft of the workpiece when it is set on a grinder. Figure 1 shows a conventional example of this type of machining jig. In this example, a workpiece 1 to be machined has three axes 3A, 3B, 3C around a roughly triangular main body 2. are arranged radially, and these axes 3A, 3B, 3
In C, each axis is located in the same plane. FIG. 1 shows the state in which the shaft 3A is being ground.The remaining shaft 3B is supported on the fixed V block 4, and the shaft 3B is supported on the fixed V block 4.
C is supported on the movable V-block 5. The fixed V-block 4 is fixed to the front face of a driver 7 which is rotationally driven by a spindle 6, while the movable V-block 5 is fixed to the front face of a movable platen 9 which is tiltable about a pivot 8. This movable plate 9
selectively moves between stoppers 10 and 11;
When the push rod 12 presses the pin 13, the end face of the movable platen 9 comes into contact with the stopper 10, and when the push rod 12 is retreated, the spring force of the spring 14 pushes the movable platen 9 to abut the stopper 11. Therefore, when the movable platen 9 is in contact with the stopper 11, the supporting surfaces of the V-blocks 4 and 5 are at the same height, and with the movable platen 9 in contact with the stopper 10, the supporting surfaces of the V-blocks 4 and 5 are at the same height. The surfaces will be at different heights. When the diameters of the shafts 3B and 3C of the workpiece 1 are equal in the illustrated state, the movable platen 9 may be brought into contact with the stopper 11. Furthermore, when the workpiece 1 is rotated 120 degrees clockwise around the center 0 after grinding the shaft 3A, the small diameter shaft 3A is located above the V block 5, and the large diameter shaft 3C is located above the V block 4. In this case, it is necessary to move the push rod 12 forward and rotate the movable platen 9 about the pivot 8 so that the movable platen 9 comes into contact with the stopper. As a result, the movable V-block 5 moves forward by an amount approximately corresponding to the radius difference, the position of the supporting surface is corrected, and the shaft 3B can be centered.

However, when using the above-mentioned conventional machining jig, the amount of protrusion of the stoppers 10 and 11 had to be manually adjusted in accordance with the difference in radius of the shafts, which was troublesome. Further, since the movable V-block 5 moves in an arc around the pivot 8, the state of contact with the shaft 3 of the workpiece 1 changes when the movable platen 9 moves forward and when it retreats. In other words, if the shaft 3 is adjusted so that it can make line contact with the support surface when the movable platen 9 is in the retracted position, the movable platen 9
There was a problem in that the state changes to a state close to point contact at the forward position, resulting in a decrease in positioning accuracy.

Therefore, the purpose of the present invention is to reduce the V
To provide a workpiece machining jig that improves accuracy by uniformizing contact conditions between a support surface of a block and a shaft, and facilitates adjustment.

In order to achieve this purpose, the present invention supports the shaft ends of the shafts to be machined in a workpiece having multiple shafts arranged radially at the center, while supporting two adjacent shafts on the opposite side with a face plate. In a jig that is supported and processed by the V blocks above, a pair of V blocks are arranged at symmetrical positions with respect to the center on two diameter lines orthogonal through the center of the face plate, and one set of V blocks The supporting surfaces of the blocks are set at the same height, while the supporting surfaces of the other sets of V-blocks are set at different heights by a dimensional difference corresponding to the difference in the radius of the shaft. be.

An embodiment of the workpiece machining jig according to the present invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, reference numeral 20 indicates a rotating spindle, and the rotating spindle 20 has a driven pulley 2 at its rear end.
1, and is rotatably driven by a motor (not shown). The rotating spindle 20 is rotatably supported by bearings 22 and 23, and has a drive plate 24 fixed to its front end. Also, on the front of this drive board 24, there is a conical surface.
A face plate 25 with 25a is fixed by a plurality of bolts.

The conical surface 25a of the face plate 25 has a first groove 26 and a second groove 27 that are perpendicular to each other through the center of the face plate.
is formed in the shape of a cross. These grooves 26,2
7 have the same groove width, and the groove bottoms are constructed such that the angle between the longitudinal center line and the axis of the rotating spindle 20 is equal to each other.

A first set of V blocks 28A, 28B is fixed in the first groove 26 at symmetrical positions with respect to the center, and these V blocks 28A, 2
The surface where 8B supports the workpiece 1 is the rotating spindle 20.
The height is set equal to the reference plane perpendicular to the axis of. Therefore, two adjacent axes of equal diameter of the workpiece 1 having three axes 3A, 3B, and 3C arranged radially, for example, 3B and 3C, are
When supported on the support surfaces of the blocks 28A and 28B, the centering of the remaining shaft 3A is automatically set, so it is only necessary to support the shaft end at the center.

On the other hand, a second set of V blocks 29A, 29B is fixed in the second groove 27 at positions corresponding to the first set of V blocks 28A, 28B. One of these V-blocks, for example V-block 29A, has its support surface set to the same height from the reference surface as that of V-blocks 28A and 28B, but the support surface of the other V-block 29B is , is set at a higher position by the dimensional difference corresponding to the difference in the radius of the shaft. Therefore, the large diameter shaft is located in the V block 29A, and the shaft with a large diameter is located in the V block 29B.
When the small-diameter shaft is positioned at the position, the remaining shafts are accurately positioned, and the shaft and the supporting surface of the V-groove maintain the same line contact state.

Loading, indexing and unloading of workpieces into a machining jig constructed in this manner is usually performed using a manipulator. Therefore, the stopping positions of the first set of V-blocks 28A, 28B and the second set of V-blocks 29A, 29B must be accurately determined, and a fixed-position stopping and discrimination mechanism is required for this purpose.

The fixed position stop mechanism includes a first positioning ring 30 fixedly spaced above the rotating spindle 20.
and a second positioning ring 31. Among these, three claws 3 are provided on the circumference of the first positioning ring 30.
0a, 30b, and 30c are provided to give phase angles of 90 degrees and 180 degrees to each other, while two claws 31a, 31b are provided on the circumference of the second positioning ring 31 at positions facing each other on the diameter line. It is provided. These two pawls 31a, 31b are provided at the same phase position as the pawls 30a, 30b of the first positioning ring 30, and only the pawl corresponding to the pawl 30c is omitted. A stop pawl 33 rotatable about a pivot shaft 32 is pivotally supported on the outside of the first positioning ring 30.
The claw 3 is timed by the cylinder device 34.
It is designed to be able to mesh with any one of 0a, 30b, and 30c.

Similarly, a stop pawl 36 is provided on the outside of the second positioning ring 31 and is driven by a cylinder device 35 in synchronization with the timing.

When these stop pawls 33 and 36 are engaged with the pawls at the same position on both positioning rings 30 and 31, it is determined that they are the first set of V blocks 28A and 28B, and the stop pawl 33 is connected to the pawl 30c. However, when the stop claw 36 is placed on the outer peripheral surface of the second positioning ring 31, it can be determined that it is the second set of V blocks 29A, 29B.

As is clear from the above description, according to the present invention, a first set of V-blocks and a second set of V-blocks, each consisting of a pair of V-blocks, are arranged symmetrically with respect to the center on a diametrical line perpendicular to the center of the face plate. This is because V-blocks are provided, and the supporting surfaces of the first set of V-blocks are made to have the same height, while the supporting surfaces of the second set of V-blocks are made to have different heights by an amount corresponding to the difference in the radius of the shaft. , centering of the shaft to be machined can be completed simply by placing the shaft of the workpiece, which has axes arranged radially, on the supporting surface of the V-block, and the shaft is always aligned with the supporting surface of the V-block. Since the contact state can be maintained, positioning accuracy can be improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an example of a conventional workpiece processing jig, Fig. 2 is a sectional view showing an embodiment of the workpiece processing jig according to the present invention, and Fig. 3 is a longitudinal sectional view showing an example of a conventional workpiece processing jig. FIG. 4 is a front view of the jig and a side view showing the fixed position stopping mechanism. 20... Rotating spindle, 25... Face plate, 26
...First groove, 27...Second groove, 28A, 28
B...First set of V blocks, 29A, 29B...
The second set of V-blocks.

Claims (1)

[Scope of utility model registration request] A jig that supports the end of the shaft to be machined at the center of a workpiece having multiple shafts arranged radially, while supporting two adjacent shafts on the opposite side with V-blocks on the face plate. A pair of V blocks are arranged at symmetrical positions with respect to the center on two diameter lines orthogonal through the center of the face plate, and the support surface of one of the V blocks is as follows:
A workpiece machining jig characterized in that the V-blocks of the other sets are set at the same height, while the support surfaces of the other sets of V-blocks are set at different heights by a dimensional difference corresponding to the difference in the radius of the shaft.