Patent ID: 9616479
Date: 2017-04-11
CPC Classifications: B21D,Y10T

Claim:
1. A molding method for a plate-shaped workpiece comprising a first surface and a second surface, the first surface formed of a flat surface, and a second surface positioned opposite to the first surface on the plate-shaped workpiece and formed of a flat surface, the molding method comprising: forming a concave portion at the first surface of the plate-shaped workpiece, wherein the plate-shaped workpiece is one piece; forming a first stepped portion at a corner of the first surface side of the concave portion, wherein the first stepped portion has a stepped shape; inserting a shim formed with a second stepped portion and formed of a material having a lower Young's modulus than that of the plate-shaped workpiece into the concave portion so that at least a portion of the first stepped portion is engaged with the second stepped portion; and pressing the plate-shaped workpiece against a mold member to perform bending processing, wherein a shape of the first surface becomes a concave surface shape.