Patent ID: 9630229
Date: 2017-04-25
CPC Classifications: B21D,B21K,H01M,Y02E

Claim:
1. A method for molding a protruding portion in a metal plate material by a plurality of molding tools, each molding tool having a die and a punch, the method comprising: a first step of molding the protruding portion in the metal plate material by drawing-out molding that uses a first molding tool, the protruding portion being molded so that a top of the protruding portion is made thinner than other parts of the metal plate material being molded; a second step of rolling out sidewalls of the protruding portion molded in the first step by use of a second molding tool to extend the sidewalls by applying pressure to the sidewalls, the protruding portion being molded to have an arrangement pitch narrower than an arrangement pitch of the protruding portion formed in the first step, and a third step of shaping the sidewalls of the protruding portion molded in the second step to erect the sidewalls by use of a third molding tool, wherein the die and the punch of each of the first molding tool, the second molding tool and the third molding tool each include concave portions and convex portions for forming the protruding portion in the metal plate material, the concave portions and the convex portions of each of the first molding tool, the second molding tool and the third molding tool each have an arrangement pitch defined as a distance between one of adjacent concave portions or adjacent convex portions, respectively, and the arrangement pitch of the concave portions and the convex portions of the die and of the punch of the third molding tool is wider than the arrangement pitch of the concave portions and the convex portions of the die and of the punch of the second molding tool and is narrower than the arrangement pitch of the concave portions and the convex portions of the die and of the punch of the first molding tool.