| 摘要 |
<P>PROBLEM TO BE SOLVED: To actualize a manufacturing method for obtaining a cylindrical ring member having a desired axial-direction size so that a ring-shaped bearing ring material can be manufactured inexpensively, the ring-shaped bearing ring material being material for manufacturing, for example, an inner ring and an outer ring constituting a radial ball bearing. Ž<P>SOLUTION: An intermediate material is prepared in which both axial-direction end parts of a first and a second cylinder parts 14 and 12 are coupled to each other with a coupling part 17, and in such a state that the position of the one end face of both axial-direction end faces of both cylinder parts 14 and 12 is regulated to a prescribed position, the other end face is pressurized with punches 25 and 28. Then, the axial-direction sizes of both cylinder parts 14 and 12 are regulated to respective prescribed values. Excess metal generated as a result is released diametrically. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
