Manufacturing apparatus and manufacturing method for hat-shaped section component with curved projection portion

A manufacturing method for manufacturing a hat-shaped section component including a curved projection portion by pressing a flat-shaped workpiece, the curved projection portion being curved in a longitudinal direction so as to project toward a first side in a pressing direction, the manufacturing method comprising:

• preparing a manufacturing apparatus including
• a punch having a first mold surface facing toward the first side in the pressing direction, the first mold surface including a curved projection portion mold surface a part of which curves in the longitudinal direction so as to project toward the first side in the pressing direction,
• a holder having a pair of second mold surfaces facing toward the first side in the pressing direction, the second mold surfaces being provided on both outer sides of the first mold surface in a width direction,
• a die having a pair of third mold surfaces and a fourth mold surface, the third mold surfaces facing toward a second side in the pressing direction so as to face the second mold surfaces, the fourth mold surface being provided between the third mold surfaces via steps such that the fourth mold surface is placed to be closer to the first side in the pressing direction than the third mold surfaces, the fourth mold surface facing toward the second side in the pressing direction so as to face the first mold surface, the fourth mold surface having an opening opened toward the second side in the pressing direction, the opening being formed in a part, of the fourth mold surface, that corresponds to the curved projection portion mold surface, and
• a pad provided in the die and having a fifth mold surface facing toward the second side in the pressing direction so as to face the curved projection portion mold surface, the pad being configured to be relatively movable toward the first side in the pressing direction so as to be pushed into the opening against biasing force toward the second side in the pressing direction so that the fifth mold surface becomes flush with the fourth mold surface from a state where the fifth mold surface projects toward the second side in the pressing direction from the fourth mold surface;
• and
• a molding step of molding the hat-shaped section component having a vertical wall between a top plate and a flange and forming the curved projection portion in the hat-shaped section component such that, in a state where a to-become-flange portion as a part to become the flange after molding in the workpiece is sandwiched between a corresponding one of the second mold surfaces and a corresponding one of the third mold surfaces, a to-become-top-plate portion as a part to become the top plate after molding in the workpiece is pressed by the first mold surface toward the first side in the pressing direction, wherein, in the molding step, the to-become-top-plate portion is pressed by the first mold surface while a part, in the to-become-top-plate portion, that corresponds to the curved projection portion is sandwiched between the fifth mold surface and the curved projection portion mold surface.