| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a disk for wheel capable of reducing a forming time to a level of spinning and working a plate thickness so as to be uneven in the peripheral direction. SOLUTION: A disk stock 10 is placed on a mandrel 11 formed with recessed shape parts 15 to sections corresponding to disk decoration windows in plural pieces in the peripheral direction, a roll axis 14 is turned around an axis of the mandrel 11, the disk stock 10 is pressed to the mandrel 11 by a forming roll 12 rotatable around the roll axis 14, while the forming roll 11 is rotated around the roll axis 12, the roll axis 14 is rotated around the mandrel axis 13, the forming roll 12 is moved from a disk stock center part to an outer peripheral part in a disk radial direction, a disk preformed part, which has an uneven plate thickness distribution in the peripheral direction where the section corresponding to the disk decoration window is made to a thick thickness, is manufactured.
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