[TASK] It is to provide a press forming method comprising a press process of two or more stages, which suppresses the generation of breakage or wrinkles in the bulging or drawing without involving a mold of a complicated structure, an increase of a press process or a restriction of a component form and improves the yield and formability effectively. [SOLUTION FOR TASK] A method for press forming a product having a shape of a top board portion, a vertical wall portion continuously formed from the top board portion and a flange portion continuously formed from the vertical wall portion at a press process of two or more stages, characterized in that a convex or concave bead shape is preformed in a position of a flat metal sheet as a raw material corresponding to a neighborhood of a position generating breakage or flange wrinkles when the raw material is formed into a product shape, and thereafter a product shape is press formed from the raw material having the preformed bead shape.
展开▼
