JPH0217285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bar field joint outer race machining jig. Specifically, the present invention relates to a bar field joint outer race machining jig. This relates to a jig for processing.

Conventionally, the processing standard for polishing the ball groove and inner spherical surface of the outer race with the shaft of a bar field joint is that the center of the ball groove side and the center of the shaft side, which are created by plastic working, are processed after quenching. However, according to this conventional method, the machining reference portion during polishing cannot be precisely machined for the ball groove and inner spherical surface because of the influence of plastic working accuracy and quenching strain. As a result, in order to prevent polishing residue from appearing on the ball groove and the spherical surface, it is necessary to add a large polishing allowance, resulting in poor productivity. Furthermore, the amount of polishing varies greatly depending on the part of the ball groove, the quenching state after polishing varies, and the durability of the groove portion in which the ball rolls deteriorates.

An object of the present invention is to provide a bar field joint outer race processing jig that can process reference parts such as polishing without being affected by plastic processing accuracy or distortion of the outer race shaft due to quenching. That is.

For this reason, the present invention has a central base center provided with a center piece at the tip for positioning the ball groove side center of the bar field joint outer race that is the workpiece, and a tip portion that is fitted onto the outside of the central base center. an intermediate base center which is slidably provided with a tapered surface for holding a ball; and a ball stopper which is provided outside the intermediate base center and has one end fixed to the central base center and the other end in contact with the ball. It is characterized by having a configuration having the following.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, reference numeral 1 denotes a central base center, which is slidably fitted onto a shaft portion 1a and has a tapered surface 2a. Reference numeral 3 denotes a ball stopper, which is attached to the central base center 1 with bolts 9 using the outer periphery of the intermediate base center 2 as a guide.
A steel ball 4 is moved in the circumferential direction by the tapered surface 2a of the intermediate base center 2 and the ball stopper surface 3a of the ball stopper 3 to position the outer race ball groove 15c. Reference numeral 5 denotes a rotation stopper, which is attached to the ball stopper 3 with a screw 5a to prevent the outer race 15, which is a workpiece, from rotating. A spring 6 constantly pulls the steel ball 4 inward. 7 is the centerpiece,
It is attached to the tip of the shaft portion 1a of the central base center 1 to position the ball groove side center 15a of the outer race 15. A connecting shaft 8 is connected to the intermediate base center 2 by a screw 8a and transmits a force for sliding the center 2 along the shaft portion 1a of the central base center 1. Reference numeral 10 denotes a bushable plate, which is fastened to the connecting shaft 8 with a nut 11 and connected to a bushable rod 14 of a processing machine (not shown) with a screw 14a. Further, 12 is a bolt, and 13 is a spindle of a processing machine. Note that the ball groove side center of the outer race 15, which is the workpiece, is 15a, the shaft side center is 15b, the ball groove is 15c, and the inner spherical surface is 1.
5d, the processing standards for polishing the groove portion 15c and the inner spherical surface 15d are 15e and 15f.

Next, the processing procedure for the processing standards 15e and 15f will be explained. First of all, pushable rod 14
is moved to the left in Figure 1. As a result, the intermediate base center 2 moves to the left, and the steel ball 4 moves inward along the tapered surface 2a and the ball stopper surface 3a of the ball stopper 3.
In this state, the center 15a and center piece 7 are brought into close contact from the right side so that the steel balls (3 pieces) 4 are placed at positions that equally divide the bar field joint outer race 15 into three of the six positions of the ball groove 15c. Set it so that Next, by moving the bushing rod 14 to the right,
The steel ball 4 is connected to the tapered surface 2a of the intermediate base center 2 and the ball stopper surface 3 of the ball stopper 3.
The outer race 15 is moved in the outer circumferential direction along a.
The position of the ball groove 15c is determined. At the same time, the ball groove side center 15a of the outer race 15
and the centerpiece 7 are brought into close contact with each other. Now, as shown in FIG. 1, the force that moves the bushable rod 14 to the right is P, the taper angle of the tapered surface 2a of the intermediate base center 2 is β, and the center O of the ball groove 15c and the steel ball 4 are If the angle formed by the center Q is α, the teal ball 4 is in the ball groove part 15
The ball groove portion 15c is positioned by a force P/cosβcosα that tends to spread in the outer circumferential direction at right angles to c. This force also causes the outer race 15 to be forced in the direction in which the center 15a and the center piece 7 come into close contact with each other.
It is pulled by tanα/cosβ×P, and the center 15a is positioned by the center piece 7. In this way, with the jig of the present invention, the processing reference portions 15e and 15f can be processed by polishing or the like using the ball groove portion 15c and the ball groove side center 15a as a reference.

As another example, in FIG. 1, α=
0, set the length of the ball stopper 3, and set the bar field joint outer race 15.
A method in which the ball groove side center 15a is positioned only in the axial direction and the shaft side center 15b is used as a reference can also be used to process the reference surfaces 15e and 5f without being affected by the plastic processing accuracy and heat treatment distortion of the outer race 15. processing is possible.

FIG. 3 shows processing standards for polishing the ball groove and inner spherical surface of a conventional bar field joint outer race. In this case, both centers 15a and 1
Processing reference portions 15e and 15f are processed based on 5b. Now the ball groove 15c and both centers 15a
and 15b are processed by plastic working, the ball groove 15c, the inner spherical surface 15d, and the groove side center 15
A is molded using a mold in the same direction, and the relative accuracy is good. However, the shaft side center 15b has a different mold direction, and cannot be molded with high precision relative to the ball groove side. Here, the deviation of the shaft side center 15b is E
Then, in this conventional method, processing standards 15e and 1
5f and polishing the ball groove portion 15c and the inner spherical surface 15d based on this, a deviation of e=l ₂ /l ₁ E occurs at the center portion of the ball groove R. Furthermore, even if the ball groove 15c and the inner spherical surface 15d are machined with reference to both centers 15a and 15b, the shaft 15g of the outer race will be distorted (bent) in the subsequent heat treatment process, and the shaft side center 15b will be distorted with respect to the ball groove. This will cause the ball groove polishing amount to vary greatly.

Therefore, with the processing jig of the present invention, by machining the processing standards when polishing the ball groove and inner spherical surface after heat treating the outer race, it is possible to make the polishing allowance constant during polishing the ball groove and inner spherical surface. .
Furthermore, this reduces the amount of polishing of the ball groove, and by forming the ball groove with high precision through plastic processing, it becomes possible to polish only the inner spherical surface and eliminate the polishing of the ball groove.

As described above, according to the processing jig of the present invention, it is possible to process a reference part such as polishing without being affected by plastic processing accuracy or distortion of the outer race shaft due to quenching, and the effects achieved are as follows. , is extremely large.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the cutting line A-A in FIG. 1, and FIG. 3 is an explanatory diagram of a conventional method. . 1... Central base center, 2... Intermediate base center, 2a... Tapered surface, 3... Ball stopper, 4... Ball, 7... Center piece, 15... Outer race, 15a... ...Ball side center, 15b....Shaft side center, 15c...
...Ball groove, 15d...Inner spherical surface, 15e,
15f……Processing reference part.

Claims (1)

[Claims] 1. A central base center with a center piece at the tip for positioning the center of the ball groove side of the bar field joint outer race, which is the workpiece;
an intermediate base center that is fitted into the outside of the central base center and is slidably provided with a tapered surface for holding a ball at its tip end; A bar field joint outer lace processing jig, which has a ball stopper fixed to a base center and whose other end is in contact with a ball.