Press forming method

摘要

Problem to be solved: to provide a press forming method capable of restraining cracking at the flange portion and suppressing wrinkles in the top plate portion and the longitudinal wall portion in press forming of the press molded products bent in the concave shape by the upper surface.Press forming method according to the present inventionTop plate partThe vertical wall portion 7 continuous from the top plate part 3 through the punch shoulder partThe flange portion 11 is continuous from the vertical wall portion 7 through the die shoulder portionA press molded article 1 having a curved portion 13 curved in a concave shape by a top view is press formed.The bending radius of the punch shoulder part 5 at the curved portionIt is characterized by increasing the curvature from the center to the end.Diagram