| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for efficiently producing a cold forging having a fitting shaft part, a flange part, and a shaft part from a cylindrical material in a cold forging process, and to provide a shaft member of a rolling bearing device for a wheel, produced by the same. <P>SOLUTION: In the method for manufacturing a shaft member 1 of a rolling bearing device for wheels in which a cylindrical fitting shaft part 30 having a recess 35 opened in the axial direction, a flange part 21 having the flange diameter larger than the diameter of the fitting shaft part, and a columnar shaft part 10 are coaxially arranged along the axial direction, a cold forging 66 integrally having the fitting shaft part 30, the flange part 21, and the shaft part 10 is formed by one forward extrusion and one forward extrusion of the cold forging process by using a columnar material 62 having the outside diameter larger than the diameter of the fitting shaft part and smaller than the flange diameter. <P>COPYRIGHT: (C)2013,JPO&INPIT |
