| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a retainer of a constant velocity universal joint, capable of highly accurately forming a window part of the retainer by a punching press. SOLUTION: An inner peripheral surface of the retainer 14 has a spherical surface concave part 14a and an inner peripheral end part 14b formed adjacent to one end part side of the spherical surface concave part 14a and having an inner diameter larger than an inner diameter of one end part of the spherical surface concave part 14a. The manufacturing method of the retainer 14 includes: a base material forming process of forming a base material 100 having an excess thickness 110 over the whole periphery on the inner side in the radial direction of the inner peripheral end part 14b to the final shape of the retainer 14 and with the window part 14d not formed; a punching press process of forming the window part 14d by relatively moving a punching punch 201 and dies 202 and 203 in the axial direction of the punching punch 201, by allowing the dies 202 and 203 to abut on the periphery of the window part 14d out of an outer peripheral surface 14c of the base material 100, by allowing a tip surface 201a of the punching punch 201 to abut on a position for forming the window part 14d out of an inner peripheral surface of the base material 100; and an excess thickness shaving off process of shaving off the excess thickness 110. COPYRIGHT: (C)2009,JPO&INPIT
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