Producing method, producing apparatus and producing equipment line of press formed product

A method for producing a press formed product from a starting material,

• the press formed product comprising a top panel part, vertical wall parts respectively extending from both ends of the top panel part, ridge line parts between the vertical wall parts and the top panel part, and flange parts extending from ends of the respective vertical wall parts, and including a shape-changing part in a part of the ridge line parts,
• the producing method comprising:
• a preparation step of preparing a metal sheet as the starting material;
• and
• a press working step of performing press working on the starting material,
• the press working step using a main punch, a sub punch arranged adjacent to the main punch, a pad arranged opposed to a front end surface of the main punch, and a die capable of receiving the pad, and including:
• a step of starting pushing-in of the starting material into the die by the main punch, with the starting material being sandwiched between the main punch and the pad;
• a step of continuing the pushing-in of the main punch with respect to the die to a bottom dead point for the pushing-in, so as to receive the pad in the die, and to form the top panel part, the ridge line parts, and the vertical wall parts;
• and
• a step of starting pushing-in of the sub punch with respect to the die and the pad, and continuing the pushing-in of the sub punch to a bottom dead point for the pushing-in, so as to form the flange parts.

An apparatus for producing a press formed product from a starting material,

• the press formed product comprising a top panel part, vertical wall parts respectively extending from both ends of the top panel part, and ridge line parts between the vertical wall parts and the top panel part, and including a shape-changing part in a part of the ridge line parts, and
• the producing apparatus comprising:
• a punch including a front end surface corresponding to the top panel part, side surfaces corresponding to the vertical wall parts, and punch shoulder parts corresponding to the ridge line parts;
• a pad arranged opposed to the front end surface of the punch;
• a die capable of receiving the pad;
• and
• a pad adjusting mechanism adjusting a distance from the front end surface of the punch to the pad.

A producing apparatus of a press formed product, the producing apparatus comprising:

• a punch comprising a front end surface, side surfaces, and punch shoulder parts provided between the front end surface and the side surfaces, and including a shape-changing part in a part of an extending direction of the punch shoulder parts, the shape-changing part changing a shape;
• a pad arranged opposed to the front end surface of the punch, at least in a cross section perpendicular to the extending direction of the punch shoulder parts in the shape-changing part;
• a die comprising a concave part capable of receiving the pad in a surface opposed to the front end surface of the punch, and corner parts whose portions opposing to the punch shoulder parts having shapes conforming to shapes of the punch shoulder parts;
• and
• a pad adjusting mechanism adjusting an interval between the front end surface of the punch and the pad.