Method for manufacturing molded material, and surface-treated metal plate used therein

摘要

This method for manufacturing a molded material includes a step wherein a convex molded part is formed by performing a molding process one or more times on a surface-treated metal plate, and a step wherein an ironing process is performed on the molded part by means of an ironing mold after the molded part is formed. The ironing mold is equipped with a punch that is inserted into the interior of the molded part, and a die having a push-in hole into which the molded part and the punch are pushed. The inner circumferential surface of the push-in hole is provided so as to extend non-parallel to the outer circumferential surface of the punch, and so as to have a clearance with respect to the outer circumferential surface in accordance with the non-uniform sheet thickness distribution of the molded part in the push-in direction prior to the ironing process, so as to achieve a fixed amount of ironing of the molded part along the push-in direction.