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.

A tank portion defines a space therein and has an opening on one side. A foot portion is in a plate shape extending radially outward from a bottom end of the tank portion on the one side. A core plate covers the opening and has a base portion and a holder portion. The base portion is in an elongated rectangular plate shape having first and second long lateral sides and a short lateral side. The holder portion includes a first holder at the first long lateral side, a second holder at the second long lateral side, and a third holder at the short lateral side, each gripping the foot portion. All the first holder, the third holder, and the second holder are one piece continuously extending along the first long lateral side, the short lateral side, and the second long lateral side.

Provided is a press-formed article manufacturing method including a first step of pressing a blank with the first pressing apparatus to form a first intermediate formed article having a pair of bent portions that is bent to one side in the plate thickness direction and having a spacing between the bent portions that is narrower than the width of the top plate and equal to or more than the width of the top portion of the convex portion, and a second step of moving the second die relative to the second punch side punch with respect to the die pad and the second punch and forming a second intermediate formed article, having the standing wall formed therein, with the second die and the second punch, in a state where a portion between the bent portions is sandwiched between the die pad protruding from the second die to the second punch side punch, and the convex portion, with one side of the first intermediate formed article in the plate thickness direction as the convex portion side of the second pressing apparatus.

To reduce warping of vertical wall portions without causing buckling occurring in a component shape not having a flange portion. A punch and a pad sandwiching a top sheet portion therebetween in the sheet thickness direction, bending blades for bend-forming the vertical wall portions, and stoppers facing the bending blades in the press direction and constraining end portions of a material to be machined are provided. The punch is supported by a first cushion component elastically expandable and contractible in the press direction. The bending blades each have an upper die component and a lower die component disposed facing each other in the press direction with an interval (D) equal to or larger than a set compression amount and a second cushion component interposed between the upper die component and the lower die component, maintaining the interval (D), and contractible in the press direction at a predetermined pressure or more. The cushion pressure of the second cushion component is lower than the cushion pressure of the first cushion component and has such cushion pressure that the second cushion component does not contract during the bend-forming of the vertical wall portions.

A method of manufacturing a press-formed product includes: capturing the amount of warp in a sheet to be pressed separately for each sheet; and using a die 6, a punch 7, and a movable mold part to press-form the sheet into a press-formed product. During press-forming, the initial position of the movable mold part 9 relative to the die 6 or punch 7 is controlled depending on the amount of warp in the sheet.

A member has a transverse cross section that includes a top sheet, upper ridgelines, vertical walls, lower ridgelines, and floor flanges and includes, on at least one end portions in the extending directions of the upper ridgelines, a top sheet flange via a top sheet ridgeline and vertical wall flanges via vertical wall ridgelines, in which the vertical wall flange and the floor flange are continuous. In end portions of the upper ridgelines and the lower ridgelines, the sum totalR of the radii of curvature of corner portions of the vertical walls and the sum totalL of the widths of the top sheet and the vertical walls in an end portion of the member have the relation ofR/L0.13.

A member has a transverse cross section that includes a top sheet, upper ridgelines, vertical walls, lower ridgelines, and floor flanges and includes, on at least one end portions in the extending directions of the upper ridgelines, a top sheet flange via a top sheet ridgeline and vertical wall flanges via vertical wall ridgelines, in which the vertical wall flange and the floor flange are continuous. In end portions of the upper ridgelines and the lower ridgelines, the sum totalR of the radii of curvature of corner portions of the vertical walls and the sum totalL of the widths of the top sheet and the vertical walls in an end portion of the member have the relation ofR/L0.13.

A method for manufacturing a pressed component including an elongated top plate, a wall having one end connected to a short direction end portion of the top plate, that curves with a convex shape bowing toward an opposite side to the top plate as viewed from an upper side of the top plate, and that includes a sharp curve portion, and a flange that is connected to another end of the wall, and that extends in a plate thickness direction of the wall toward the opposite side to the top plate side. The manufacturing method includes pressing to form an intermediate formed component including a preliminary flange and pressing to deform the preliminary flange to form the preliminary flange into the flange.

A device for stamping a blank in order to produce a stamped part. The device includes a punch including a bearing surface, an anvil, and magnetic field generator. The stamping device has an initial position where the bearing surface of the punch receives a portion of a first surface of the blank, the anvil and the magnetic field generator are arranged on either side of another portion of the blank, with the anvil facing the first surface, and the magnetic field generator facing a second surface opposite the first surface. The magnetic field generator applies a pressure on the blank in a direction towards the anvil. The stamping device is also configured to move the punch relative to the magnetic field generator in a direction away from the anvil.

A device for stamping a blank in order to produce a stamped part. The device includes a punch including a bearing surface, an anvil, and magnetic field generator. The stamping device has an initial position where the bearing surface of the punch receives a portion of a first surface of the blank, the anvil and the magnetic field generator are arranged on either side of another portion of the blank, with the anvil facing the first surface, and the magnetic field generator facing a second surface opposite the first surface. The magnetic field generator applies a pressure on the blank in a direction towards the anvil. The stamping device is also configured to move the punch relative to the magnetic field generator in a direction away from the anvil.