| 摘要 |
A spinning forming method of the present invention includes a first forming step and a second forming step, in each of which a plate (W) fixed to a main shaft is formed while being rotated. In the first forming step, a processing tool is brought into contact with a first main surface (S1) of the plate (W) to form a first level-changing portion (41) extending from the first main surface (S1) toward a second main surface (S2). In the second forming step, the processing tool is brought into contact with the second main surface (S2) at an outer peripheral side of the first level-changing portion (41) to form a second level-changing portion (51) extending in an opposite direction to the first level-changing portion (41). |
