Metal plate for press forming, press forming apparatus, and manufacturing method of press parts

摘要

A technique capable of further reducing molding defects such as cracks, wrinkles, and reduced dimensional accuracy is provided for a press part having a hat-shaped cross-sectional shape having one or two or more curved portions in plan view. The metal plate 10 for press molding is a ridge line in the line length of the ridge line between the top plate portion 2 and the vertical wall portion 3 in the press part shape 1 in the region corresponding to the curved portion 1A. With respect to the unfolded shape in which the shape of the press part was developed in a plane by making the line lengths at the positions corresponding to the same, with respect to the region corresponding to the curved portion 1A, the position of the flange portion 4 on the curved convex side In a direction in which the line length of the outer edge approaches the line length of the outer edge of the flange portion 4 on the curved convex side in the shape of the press part, the boundary position between the area corresponding to the curved portion 1A and the other area is defined as the top plate portion ( Rather than the position corresponding to the ridge line between 2) and the vertical wall portion 3 on the curved concave side, the rotation center P was set at a position on the curved concave side, and the shape was rotated and displaced in the plane.