Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Satoshi Shirakami

Yoshiaki Nakazawa

Tohru Yoshida

Masaaki Mizumura

Koichi Sato

Jun Nitta

Shigeru Yonemura

Yasuhiro Ito

Toshiya Suzuki

Kenichiro Otsuka

Hiroshi Yoshida

Takashi Yasutomi

Yasushi Yamamoto

Masahiro Kubo

Masafumi Azuma

Atsushi Ono

Takashi Miyagi

Yasuharu Tanaka

Ryuichi Nishimura

Yasunori Sawa

Toru Yonebayashi

Nobutaka Shimizu

Nobuo Yoshikawa

Seiichi Daimaru

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.

Stiffened panel structure

This structural member is manufactured using a structural member manufacturing device including a first clamping part having a first lower clamping member and a second upper clamping member disposed to face each other and capable of being opened and closed; a second clamping part having a third lower clamping member and a fourth upper clamping member disposed to face each other corresponding to the first lower clamping member and the second upper clamping member and capable of being opened and closed; and clamping part driver for allowing the first clamping part and the second clamping part 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.

Structural member, structural member manufacturing method, and structural member manufacturing device

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.

Method of manufacturing press-formed article, press-formed article, and press forming apparatus

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 portion flange.

Saddle-shaped press-molded article manufacturing method, pressing apparatus, and manufacturing method to manufacture saddle-shaped press-molded article

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.

Hole widening method, forming tool, and formed product

[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 materialof 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 memberand a second memberare arranged so as to extend in different directions and be adjacent to the exterior materialof an automobile, and therefore impact absorption at the time of a collision can be made even when there is no sufficient space.

Impact absorption member

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. This breaking prediction method includes a first step of performing forming analysis by using a finite element method in each of a case where the metal sheet is divided on the basis of a first mesh coarseness and a case where the metal sheet is divided on the basis of a second mesh coarseness which is coarser than the first mesh coarseness, a second step of obtaining a maximum main stress for each mesh in each of the case of the first mesh coarseness and the case of the second mesh coarseness, and a third step of obtaining a difference value between the maximum main stress in the case of the first mesh coarseness and the maximum main stress in the case of the second mesh coarseness in each portion of the component, and extracting a portion in the case of the first mesh coarseness, which corresponds to a portion in which the difference value is larger than a predetermined value, as the breaking portion.

Breaking prediction method, program, recording medium, and arithmetic processing device

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; and a reinforcing memberthat is in contact along an automobile inside surface of the exterior materialand 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 memberis 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.

Automotive exterior panel

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.

Burring method and burring apparatus

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/mm) and the thickness t (mm) of the sheet member satisfies Formula (1).4.0 (N&#xb7;mm)&#x3c;&#x3c;200 (N&#xb7;mm)&#x2003;&#x2003;Formula (1)

Exterior panel and manufacturing method of exterior panel

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.

Vehicle front portion structure

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 determination threshold.

Stretch flange crack prediction method, stretch flange crack prediction apparatus, computer program, and recording medium

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.

Coupling structure, coupling member having coupling structure, and method for manufacturing coupling member having coupling structure

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.

Growing community of inventors

Tokyo, Japan

Satoshi Shirakami