Patent ID: 7454940

Claim:
A press forming method comprising the following steps: approaching an upper die to a lower die to form at least one of preliminary concave and convex in a workpiece disposed between the upper and lower dies so as to accomplish a preliminary forming, the upper die having at least one of convex and concave, the lower die having at least one of concave and convex corresponding to at least one of convex and concave of the upper die; forcing the workpiece disposed between the upper and lower dies into a forming space under upsetting, the forming space being formed between the upper and lower dies; and striking the upper die against the lower die so as to form at least one of concave and convex in the workpiece, wherein the lower die comprises a first punch and a pushing projection disposed outside and adjacent to the first punch, the upper die comprises a drawing die disposed to face the first punch, and the workpiece is disc-shaped and comprises an outer peripheral portion.