| 摘要 |
PROBLEM TO BE SOLVED: To propose a method of manufacturing an automobile wheel which suppresses occurrence of thickening on the outside in the radial direction of a front flange section, when molding the front flange section in which an annular front circumferential part and an annular rear circumferential part are in surface-to-surface contact with each other.SOLUTION: The method of manufacturing the automobile wheel includes a sequence of bending and compression processes in which, after an outermost circumferential annular part 43 of a disk-shaped preliminary mold body 41 is bent rearwardly along both sides, the outermost circumferential annular part 43 is brought into surface-to-surface contact with a rear surface 46a of a front outer circumferential annular part 46 by folding back the outermost circumferential annular part toward the inside in the radial direction, and subsequently the outermost circumferential annular part 43 and the front outer circumferential annular part 46 are compressed in a plate thickness direction. Therefore, extensional deformation caused by the process of compression in the plate thickness direction in the bending and compression processes can easily be caused only toward the inside in the radial direction, thereby suppressing the thickening caused by extensional deformation toward the outside in the radial direction. This suppresses occurrence of burr, wrinkles or the like, thereby allowing the front flange section to be molded precisely and stably. |
