A molding method of an overlapped blank includes: preparing an overlapped blank including a first metal plate including a bulged excess portion, a first flat portion provided adjacent to the excess portion, and a second flat portion provided adjacent to the excess portion on an opposite side to the first flat portion, a flat second metal plate overlapped on the first flat portion and the second flat portion, a first joint portion where the first flat portion and the second metal plate are joined to each other, and a second joint portion where the second flat portion and the second metal plate are joined to each other; and bending the overlapped blank with the first metal plate being directed to an outer side of the bending of the overlapped blank.

A molding method of an overlapped blank includes: preparing an overlapped blank including a first metal plate including a bulged excess portion, a first flat portion provided adjacent to the excess portion, and a second flat portion provided adjacent to the excess portion on an opposite side to the first flat portion, a flat second metal plate overlapped on the first flat portion and the second flat portion, a first joint portion where the first flat portion and the second metal plate are joined to each other, and a second joint portion where the second flat portion and the second metal plate are joined to each other; and bending the overlapped blank with the first metal plate being directed to an outer side of the bending of the overlapped blank.

A center pillar reinforcement is produced satisfactorily by using a high-tensile material having a low ductility as a blank. The center pillar reinforcement is produced by performing a first step for producing a first intermediate formed product on which a body is partially formed by press-forming the blank using a first press-forming device for drawing, and a second step for pressing the first intermediate formed product by using a second press-forming device for bend-forming.

A center pillar reinforcement is produced satisfactorily by using a high-tensile material having a low ductility as a blank. The center pillar reinforcement is produced by performing a first step for producing a first intermediate formed product on which a body is partially formed by press-forming the blank using a first press-forming device for drawing, and a second step for pressing the first intermediate formed product by using a second press-forming device for bend-forming.

A press mold includes: a lower die; an upper die; a lower holding unit including lower main pads and lower sub-pads respectively installed to be movable in an upper-lower direction on the lower body through first and second cushion springs, respectively, at an edge of a lower forming steel; an upper holding unit including upper main pads integrally connected to an edge of an upper forming steel in correspondence with the lower main pads and upper sub-pads installed to be respectively movable in the upper body in the upper-lower direction through third cushion springs at the edge of the upper forming steel in correspondence with the lower sub-pads; and a gap control assembly installed in a lower main block connected to the lower main pads to form a gap set between the lower main blocks and the upper sub-blocks connected to the upper sub-pads.

A press forming tool is configured to form a press forming part including: a top portion having a convex and concave outer edge part; and a flange portion. The press forming tool includes: an upper die and a lower die; and a lower pad and an upper pad, which sandwich a blank in cooperation with the upper die and the lower die, in which, during an initial stage of forming, the flange portion is formed on the convex outer edge part, and a torsional shape portion having a torsional shape toward the concave outer edge part is formed continuously from the flange portion, and during a late stage of forming, the torsional shape portion is formed into the flange portion, and the flange portion is formed in the concave outer edge part so as to achieve formation of a target shape.

A hot-press deep-drawing forming apparatus includes a punch that constitutes a lower die and a die that constitutes an upper die. The punch has an inner-face forming surface that forms the inner face of a product, and a bent corner against which a scrap section S of a workpiece W abuts. The die has an outer-face forming surface that forms the outer surface of the product. A blank holder and a pre-forming die that clamp the scrap section are caused to move, together with the die, until the clamped scrap section abuts the bent corner. The movement of the blank holder and the pre-forming die is stopped after the scrap section has abutted the bent corner.

A hot-press deep-drawing forming apparatus includes a punch that constitutes a lower die and a die that constitutes an upper die. The punch has an inner-face forming surface that forms the inner face of a product, and a bent corner against which a scrap section S of a workpiece W abuts. The die has an outer-face forming surface that forms the outer surface of the product. A blank holder and a pre-forming die that clamp the scrap section are caused to move, together with the die, until the clamped scrap section abuts the bent corner. The movement of the blank holder and the pre-forming die is stopped after the scrap section has abutted the bent corner.

Disclosed are an apparatus and a method for deep drawing of large-sized thin-wall curved surface parts with servo reverse bulging, which pertain to the technical field of drawing of a thin-wall curved surface part. The apparatus includes a forming die, a jacking unit, and a power unit, wherein the forming die includes an upper die, a lower die, and a blank holder. The upper die and the blank holder are connected to a press machine, the blank holder is disposed above the lower die, and a blank to be drawn is placed between the lower die and the blank holder; the jacking unit is disposed inside the lower die and adapted to move along a moving direction of the upper die, enabling the blank to be drawn to deform by with reverse bulging. The method can inhibit defects of wrinkling and cracking in drawing processes effectively.

Disclosed are an apparatus and a method for deep drawing of large-sized thin-wall curved surface parts with servo reverse bulging, which pertain to the technical field of drawing of a thin-wall curved surface part. The apparatus includes a forming die, a jacking unit, and a power unit, wherein the forming die includes an upper die, a lower die, and a blank holder. The upper die and the blank holder are connected to a press machine, the blank holder is disposed above the lower die, and a blank to be drawn is placed between the lower die and the blank holder; the jacking unit is disposed inside the lower die and adapted to move along a moving direction of the upper die, enabling the blank to be drawn to deform by with reverse bulging. The method can inhibit defects of wrinkling and cracking in drawing processes effectively.