Abstract: A stiffened panel structure includes a panel-shaped component and a wire. The panel-shaped component has a panel body that curves in such a manner as to be convex outward. The wire has a first end portion and a second end portion. The first end portion is bonded to a first point on the inner surface of the panel body. The second end portion is bonded to a second point on the inner surface of the panel body. The wire is strained between the first point and the second point.

Abstract: A manufacturing method of a press forming product, includes: constraining a first face of an intermediate formed product, the intermediate formed product including the first face, a raised face, and a first ridgeline located between the first face and the raised face, and performing flange forming of press forming the raised face into a second face, a flange, and a second ridgeline located between the second face and the flange, wherein: the first ridgeline extends while being convexly curved in a direction from the raised face toward the first face, and the second ridgeline extends while being convexly curved in a direction from the flange toward the second face, viewed from a press direction of the press forming; a convex direction of the first ridgeline in a cross section along the press direction intersecting with the first ridgeline and a convex direction of the second ridgeline in a cross section along the press direction intersecting with the second ridgeline are on the same side; a curvature radius, o

Abstract: This structural member (W1) is manufactured using a structural member manufacturing device including: a first clamping part (10) having a first lower clamping member (11) and a second upper clamping member (12) disposed to face each other and capable of being opened and closed; a second clamping part (20) having a third lower clamping member (21) and a fourth upper clamping member (22) disposed to face each other corresponding to the first lower clamping member (11) and the second upper clamping member (12) and capable of being opened and closed; and clamping part driving means for allowing the first clamping part (10) and the second clamping part (20) to be relatively separated from each other while causing a position in an X-axis direction and a position in a Z-axis direction to correspond to each other.

Abstract: A method of manufacturing a press-formed article includes first press forming and second press forming. In the first press forming, an intermediate formed article is formed from a metal sheet by subjecting the metal sheet to processing including performing draw-forming on the metal sheet to form a peripheral wall portion, bending the metal sheet to form a convex flange portion, and bending the metal sheet to form at least a side standing flange main body portion of a side standing flange portion and a floor flange main body portion of a floor flange portion. The second press forming includes bending the intermediate formed article to form the convex flange portion to an inclined flange portion.

Abstract: According to the present disclosure, a manufacturing method for a saddle-shaped press-molded article includes curling a blank at a top plate configuration location of the blank that will form a top plate portion, applying the curl with a first force acting from an inner face side toward an outer face side of the blank at the top plate configuration location, applying the curl with a net force configured by second forces acting in mutually facing directions and a third force acting in the opposing direction to the first force at the outer face side of respective vertical wall configuration locations of the blank that will be molded into vertical wall portions, and in a state in which the top plate configuration location is curled, restraining end portion inverted ridge configuration location that will be molded into end portion inverted ridge portion, the top plate configuration location, the vertical wall configuration locations, and end portion flange configuration location that will be molded into end porti

Abstract: There is provided a hole widening method including a preparing process of preparing a forming tool which has a diameter-increasing portion increasing in diameter from a front end side toward a rear end side and a line-shaped projection formed to protrude outward from a surface of the diameter-increasing portion, and a workpiece in which a pilot hole is formed; and a hole widening process of successively widening the pilot hole by pushing the forming tool into the pilot hole such that the line-shaped projection of the forming tool comes into point contact with a part of a circumferential edge portion of the pilot hole in the workpiece two times or more, and forming a stretched flange.

Abstract: [Object] To make it possible to make impact absorption at the time of a collision even when there is no sufficient space. [Solution] An impact absorption member according to the present invention includes: a member that is placed adjacent to an exterior material 110 of an automobile and in which a height in a direction orthogonal to the exterior material is larger than a width in a direction along the exterior material in a cross section orthogonal to an extending direction of the member. By this configuration, a first member 122 and a second member 124 are arranged so as to extend in different directions and be adjacent to the exterior material 110 of an automobile, and therefore impact absorption at the time of a collision can be made even when there is no sufficient space.

Abstract: According to the present disclosure, a manufacturing method for a saddle-shaped press-molded article includes curling a blank at a top plate configuration location of the blank that will form a top plate portion, applying the curl with a first force acting from an inner face side toward an outer face side of the blank at the top plate configuration location, applying the curl with a net force configured by second forces acting in mutually facing directions and a third force acting in the opposing direction to the first force at the outer face side of respective vertical wall configuration locations of the blank that will be molded into vertical wall portions, and in a state in which the top plate configuration location is curled, restraining end portion inverted ridge configuration location that will be molded into end portion inverted ridge portion, the top plate configuration location, the vertical wall configuration locations, and end portion flange configuration location that will be molded into end porti

Abstract: In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted.

Abstract: Provided is a configuration that makes up for a lack of tensile rigidity and a lack of collision properties at the same time. [Solution] An automotive exterior panel according to the present invention: an exterior material 110; and a reinforcing member 120 that is in contact along an automobile inside surface of the exterior material 110 and of which a second moment of area in a direction orthogonal to the exterior material is less than or equal to 15,000 mm4 in a cross section orthogonal to a longitudinal direction of the 10 reinforcing member. By this configuration, the second moment of area in a direction orthogonal to the longitudinal direction of the reinforcing member 120 is made less than or equal to 15,000 mm4, and hence a lack of tensile rigidity can be made up for at the same time.

Abstract: In the present invention, in a piercing punch and a burring punch which are shaft members having a first axis line as the center axis lines and are provided so as to be movable along the first axis line, first, after prepared holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the piercing punch, burring holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the burring punch.

Abstract: An exterior panel includes: a metal sheet having a curved portion; a resin structure which includes a plurality of tubular bodies having the same length in a central axis direction, top surfaces covering respective one end portions of the tubular bodies, and base portions connecting respective the other end portions of the tubular bodies and is formed with the top surfaces being brought into close contact with and joined to the curved portion of the metal sheet; and a sheet member made of a resin or paper joined to the base portions of the resin structure, in which a relationship between a tensile elastic modulus E (N/mm2) and the thickness t (mm) of the sheet member satisfies Formula (1). 4.

Abstract: A vehicle front portion structure includes: a framework member in a gutter shape provided in a vehicle length direction from a front box to a cabin and having a side wall; and a dash lower panel that includes a gutter section having a side wall and fitted into an inside of the framework member and in which the side wall of the gutter section and the side wall of the framework member are joined together.

Abstract: An exterior panel includes: a metal sheet having a curved portion; a resin structure which includes a plurality of tubular bodies having the same length in a central axis direction, top surfaces covering respective one end portions of the tubular bodies, and base portions connecting respective the other end portions of the tubular bodies and is formed with the top surfaces being brought into close contact with and joined to the curved portion of the metal sheet; and a sheet member made of a resin or paper joined to the base portions of the resin structure, in which a relationship between a tensile elastic modulus E (N/mm2) and the thickness t (mm) of the sheet member satisfies Formula (1). 4.

Abstract: A stretch flange crack prediction method of predicting initiation of stretch flange cracks that occurs in a flange end section during stretch flange forming of a deformable sheet, includes: a measurement value acquisition process of acquiring, for each of a plurality of sheet-shaped test pieces, a fracture strain measurement value, a normal strain gradient measurement value, and a circumferential strain gradient measurement value; a CAE analysis process of acquiring a maximum major strain maximum element having a highest maximum major strain, a normal strain gradient of the maximum major strain maximum element, and a circumferential strain gradient of the maximum major strain maximum element; a fracture determination threshold acquisition process of acquiring a fracture determination threshold by converting the fracture strain measurement value; and a prediction process of predicting that stretch flange cracks will be initiated, when the maximum major strain is equal to or higher than the fracture determinati

Abstract: A coupling structure includes a hollow rod section formed of a metal pipe and fastening sections formed by plastic deformation of the metal pipe so as to be connected with end sections of the hollow rod section. The fastening section includes a pair of base end sections which are each connected with a peripheral wall section forming a closed cross-section at the end section of the hollow rod section, and are separated from each other, and a bottom wall including a flat surface connected with the pair of the base end sections, and a pair of front end sections including a pair of side walls curving inwards from at least widthwise end sections of the bottom wall on a base end section side.

Abstract: An evaluation method of a plastic material includes: a first shearing process of performing simple shearing deformation with respect to a first plastic sheet; a second shearing process of performing simple shearing deformation with respect to a second plastic sheet; a first partial stress-strain curve data obtaining process of obtaining first partial stress-strain curve data; a second partial stress-strain curve data obtaining process of obtaining second partial stress-strain curve data; and a synthesized stress-strain curve data obtaining process of obtaining synthesized stress-strain curve data based on the first partial stress-strain curve data and the second partial stress-strain curve data.

Abstract: [Object] Provided is a configuration that makes up for a lack of tensile rigidity and a lack of collision properties at the same time. [Solution] An automotive exterior panel according to the present invention: an exterior material 110; and a reinforcing member 120 that is in contact along an automobile inside surface of the exterior material 110 and of which a second moment of area in a direction orthogonal to the exterior material is less than or equal to 15,000 mm4 in a cross section orthogonal to a longitudinal direction of the reinforcing member. By this configuration, the second moment of area in a direction orthogonal to the longitudinal direction of the reinforcing member 120 is made less than or equal to 15,000 mm4, and hence a lack of tensile rigidity can be made up for at the same time.

Abstract: To make it possible to make impact absorption at the time of a collision even when there is no sufficient space. [Solution] An impact absorption member according to the present invention includes: a member that is placed adjacent to an exterior material 110 of an automobile and in which a height in a direction orthogonal to the exterior material is larger than a width in a direction along the exterior material in a cross section orthogonal to an extending direction of the member. By this configuration, a first member 122 and a second member 124 are arranged so as to extend in different directions and be adjacent to the exterior material 110 of an automobile, and therefore impact absorption at the time of a collision can be made even when there is no sufficient space.

Abstract: A coupling structure includes a hollow rod section formed of a metal pipe and fastening sections formed by plastic deformation of the metal pipe so as to be connected with end sections of the hollow rod section. The fastening section includes a pair of base end sections which are each connected with a peripheral wall section forming a closed cross-section at the end section of the hollow rod section, and are separated from each other, and a bottom wall including a flat surface connected with the pair of the base end sections, and a pair of front end sections including a pair of side walls curving inwards from at least widthwise end sections of the bottom wall on a base end section side.