Patent ID: 7340934
Filing Date: 2008-03-11
Classification: B21D,Y10T

Abstract:
1. A press molding die, comprising: a punch which moves in a first direction, pressing a workpiece; a molding die having a molding surface on which the workpiece is placed and a concave portion which is formed on the molding surface and which has a shape corresponding to the punch, said punch moving into the concave portion to deform the workpiece into a shape corresponding to the concave portion; a pad which presses a portion that is a part of the workpiece placed on the molding surface and that is on a periphery of the concave portion; and a micro-rough layer provided on at least one of the molding surface or the pad having a particle diameter of 10 to 30 μm, a thickness of 10 to 40 μm, a hardness of 1000 to 1100 HV, a surface roughness of 10 to 30 μmRy, and an average height of roughness of 0.01 to 0.06 mm, and convex portions; wherein said micro-rough layer is configured so that the workpiece contacts only at the convex portions, causing deformation of the workpiece in a second direction generally perpendicular to the first direction, thereby substantially preventing displacement of the workpiece.