Device for molding and method for molding metal plate

A method for molding a protruding portion in a metal plate material by a 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;
• a second step of rolling out sidewalls of the protruding portion by use of a second molding tool, the protruding portion being molded to have a pitch narrower than the protruding portion formed in the first step, and
• a third step of shaping the sidewall of the protruding portion to erect the sidewall by use of a third molding tool,
• wherein an arrangement pitch of concave portions and convex portions of a die and of a punch of the third molding tool is wider than an arrangement pitch of concave portions and convex portions of a die and of a punch of the second molding tool and is narrower than an arrangement pitch of concave portions and convex portions of a die and of a punch of the first molding tool.

A device for molding a protruding portion in a metal plate material by use of a molding tool having a die and a punch, wherein the molding tool is composed of a first molding tool, a second molding tool and a third molding tool,

• the first molding tool has a die and a punch, both of which mold the protruding portion in the metal plate material,
• the die and the punch of the first molding tool mold the protruding portion so that a top of the protruding portion becomes thinner than other parts,
• the second molding tool has a die and a punch, both of which roll out sidewalls of the protruding portion,
• the third molding tool has a die and a punch, both of which shape the sidewall of the protruding portion to erect the sidewall,
• wherein an arrangement pitch of concave portions and of convex portions of the die and of the punch of the second molding tool is narrower than an arrangement pitch of concave portions and of convex portions of the die and of the punch of the first molding tool, and
• wherein an arrangement pitch of concave portions and convex portions of a die and of a punch of the third molding tool is wider than an arrangement pitch of concave portions and convex portions of the die and of the punch of the second molding tool and is narrower than an arrangement pitch of concave portions and convex portions of the die and of the punch of the first molding tool.