| 摘要 |
PROBLEM TO BE SOLVED: To provide a simplified manufacturing method of a wheel disc for an automobile which can improve a yield. SOLUTION: In the method of manufacturing the wheel disc, a rectangular metal batten plate with a scheduled uniform thickness is cold-rolled to a partial annulus by a conical roll. At this time, the reduction of the thickness at the outer surface of the bent batten plate is at least 20%, and a circumference angle of the partial annulus is 130°to 310°, preferably 180°. Then a conical blank is formed by roll bending processing, and the ends of the blank are welded with each other. Then the bottom part of the disc is formed by plastic working. COPYRIGHT: (C)2005,JPO&NCIPI |
