This method for manufacturing a panel-like formed article has preparing a blank material made of a metal sheet having a tensile strength of 390 MPa or more and 980 MPa or less; and press-forming the blank material in a cold manner using a pressing apparatus to form the blank material into the panel-like formed article, in the press-forming, a blank holder, a first punch, and a second punch are relatively moved with respect to a die, thereby pressing the first punch and the second punch to the blank material, and pressing of the second punch to the blank material is completed before pressing of the first punch to the blank material.

[Object] To enable flexible molding of a punch-nose in press working for obtaining a molded product including a U-shaped portion in a cross-section. [Solution] Provided is a press-working apparatus configured to provide a molded product by performing press working on a work, the molded product including, in a cross-section, a U-shaped portion including a bottom, a wall, and a punch-nose between the bottom and the wall, the press-working apparatus including: a die in which a recessed portion to receive the U-shaped portion is formed; a first punch that sandwiches a central area of the bottom with a bottom surface of the recessed portion; and a second punch that is pushed into the recessed portion later than the first punch, to restrain the wall between the second punch and a side surface of the recessed portion, and sandwich the work with the bottom surface to mold a peripheral area of the bottom and the punch-nose. A sandwiching width of the first punch that sandwiches the central area of the bottom and a setback amount of the second punch from the first punch in a push-in direction are set on the basis of a target sheet thickness of the punch-nose.

A structural member of an integral shaped article using steel sheet having a tensile strength of 590 MPa or more improved in formability, produced using a die or blank holder provided with a space at least at part of a position contacting a blank at the time of pressing it. The structural member comprises a top sheet part including at least one recessed part at an outside edge part in a plan view, a first vertical wall part extending bent from a part or all of an outside edge part including the recessed part in the top sheet part, a first flange part extending bent from an edge of the first vertical wall part at an opposite side to the top sheet part, and a second vertical wall part extending bent from an edge of the top sheet part different from the outside edge part including the recessed part, and at least one projecting part on the top sheet part, the first vertical wall part, or the first flange part.

A structural member of an integral shaped article using steel sheet having a tensile strength of 590 MPa or more improved in formability, produced using a die or blank holder provided with a space at least at part of a position contacting a blank at the time of pressing it. The structural member comprises a top sheet part including at least one recessed part at an outside edge part in a plan view, a first vertical wall part extending bent from a part or all of an outside edge part including the recessed part in the top sheet part, a first flange part extending bent from an edge of the first vertical wall part at an opposite side to the top sheet part, and a second vertical wall part extending bent from an edge of the top sheet part different from the outside edge part including the recessed part, and at least one projecting part on the top sheet part, the first vertical wall part, or the first flange part.

This door inner panel is a door inner panel formed of a metal sheet and includes a first panel portion having a first top sheet portion and a first standing wall portion connected to the first top sheet portion, a second panel portion having a second top sheet portion disposed with a gap with the first top sheet portion of the first panel portion and a second standing wall portion connected to the second top sheet portion, a flange portion connected to the first standing wall portion and the second standing wall portion, and a flat sheet portion disposed between the first panel portion and the second panel portion, the first standing wall portion and the second standing wall portion respectively have a level difference portion, and both ends of the flat sheet portion are integrated with the flange portion or the level difference portions.

This door inner panel is a door inner panel formed of a metal sheet and includes a first panel portion having a first top sheet portion and a first standing wall portion connected to the first top sheet portion, a second panel portion having a second top sheet portion disposed with a gap with the first top sheet portion of the first panel portion and a second standing wall portion connected to the second top sheet portion, a flange portion connected to the first standing wall portion and the second standing wall portion, and a flat sheet portion disposed between the first panel portion and the second panel portion, the first standing wall portion and the second standing wall portion respectively have a level difference portion, and both ends of the flat sheet portion are integrated with the flange portion or the level difference portions.

An object to provide a press-forming method that can efficiently suppress springback and easily specify a position where a springback reduction effect by rigidity improvement is large, and the press-forming method used in producing a press-formed product having a predetermined shape by press-forming a sheet material, the method including: a first process that repeatedly performs a springback analysis, while changing a position to be restricted, to specify a position where a springback reduction effect by rigidity improvement is large; a second process that performs a rigidity improvement measure on a position of the sheet material corresponding to the position of the formed-product model specified in the first process; and a third process that produces the press-formed product by press-forming the sheet material on which the rigidity improvement measure has been performed.

A method for manufacturing a molded member includes carrying out a multi-stage drawing process and at least one finishing ironing process on a base metal sheet, the molded member including a tubular body and a flange formed at an end portion of the body. The multi-stage drawing process includes a preliminary drawing process for forming a preliminary body having a body element from the base metal sheet, and a plurality of compression drawing processes performed after the preliminary drawing process, the compression drawing processes drawing the body element while applying compressive force along a depth direction of the body element to a circumferential wall of the body element. The at least one finishing ironing process is carried out such that a mold clearance of an upper portion of the body element is narrower than a mold clearance of a lower portion of the body element.

A method of forming a finished stamped product includes positioning a blank on a blank holder between an upper die and a lower die, inserting a movable wedge block between the blank holder and the upper die to establish a first binder gap, and while the movable wedge block is inserted, performing a first strike of the blank by lowering the upper die a first distance to contact and partially form the blank, the movable wedge block limiting downward movement of the upper die relative to the lower die. After the first strike, withdrawing the movable wedge block to establish a second binder gap between the blank holder and the upper die, and while the movable wedge block is withdrawn, performing a second strike of the blank by lowering the upper die a second distance to finally form the blank into the finished product.

A press forming method according to the present invention includes: a first forming step of forming the press formed part by using the first press forming tool having a line length in the cross-sectional direction of the joining portion contacting with a flange portion subjected to stretch flange deformation or a flange portion subjected to shrink flange deformation is a line length L.sub.1 in the cross-sectional direction that is shorter than a line length L.sub.2, where the line length L.sub.2 is a line length in a cross-sectional direction of the joining portion of the second press forming tool for making the product shape; and a second forming step of forming the press formed part in the product shape by crash forming by using the second press forming tool in which the line length in the cross-sectional direction of the joining portion is L.sub.2.