Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Unipres Corporation

Takashi Ariga

Akihiro Uenishi

Shigeru Yonemura

Takuya Kuwayama

Toshiyuki Niwa

Noriyuki Suzuki

Tohru Yoshida

Shin Toyokawa

Isao Satsukawa

Kenji Yamamoto

Jun Nitta

Yasuharu Tanaka

Satoshi Hirose

Yukihisa Kuriyama

Shunji Hiwatashi

Yutaka Mikazuki

Eiji Isogai

Seiichi Daimaru

Masato Shida

Seiya Ishii

Satoru Okayama

Kouji Chiba

Syu Hashimoto

Takeo Kusunoki

Kenta Konishi

Masaki Itoga

Koji Nojima

There is provided a surface shape defect generating region estimating method for estimating a generating region of a surface shape defect of a deformation-processed product obtained by performing deformation processing with respect to a workpiece, the method including: a first stress distribution obtaining process of obtaining first stress distribution &#x3c3;; a second stress distribution obtaining process of obtaining a second stress distribution &#x3c3;; a comparative stress distribution obtaining process of obtaining comparative stress distribution &#x3c3;; a division comparative stress distribution obtaining process of obtaining division comparative stress distribution &#x3c3;; and a surface shape defect generating region estimating process of estimating whether or not each of the divided regions Dis a generating region of the surface shape defect.

Surface shape defect generating region estimating method, surface shape defect source region estimating method, surface shape defect generating region estimating device, surface shape defect source region estimating device, program, and recording medium

Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (B) having ridges () formed in predetermined parts of the workpiece, and then press forming the intermediate molding (B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.

Press forming method and vehicle component

[Object] To improve load resistance performance in response to collision. [Solution] An end structure of a vehicle according to the present invention includes: a beamthat extends in a vehicle width direction; and a connecting structurethat connects the beamto a vehicle body frame. In a cross-sectional view perpendicular to the vehicle width direction, the beamincludes a first top surface partand a first bottom surface partwhich face each other, a first side surface partthat connects one ends of the first top surface partand the first bottom surface part, and first flange partsthat are formed to protrude vertically outwardly at the other ends of the first top surface partand the first bottom surface part. The beamis fixed to the connecting structureby at least one of bonding of a protrusionthat is provided in the connecting structureand is arranged to protrude inside the beamto the first top surface partand the first bottom surface partand bonding of a beam attachment member provided in the connecting structureto the first flange parts

End structure of vehicle

A forming simulation method of an elastic-plastic material, which includes: calculating an element equivalent nodal force vector from stress tensor using a finite element method for one or a plurality of finite elements of a target configuration of the elastic-plastic material; and calculating the total equivalent nodal force vector of areas by integrating the element equivalent nodal force vector for the calculated one or more finite elements over all the areas or specified areas of the elastic-plastic material.

Forming simulation method, forming simulator, program and recording medium therefor, and simulation-based forming method

A method of identification of a cause of occurrence of springback comprising a press forming analysis step of numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a processing step of processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part, and a springback value calculation step of calculating a springback value based on the results of said processing.

Method of identification of cause and/or location of cause of occurrence of springback

A metallic hollow columnar member with a polygonal cross-section having at least five vertices and sides extending between the vertices, is disclosed. The polygonal cross-section is divided by two vertices (A, B) with small inside angles into two perimeter segments with a perimeter comprising one or more sides, and at least one of the two perimeter segments contains at least four sides. The respective inside angles of at least three vertices (V(i)) included in the perimeter segment which includes the at least four sides are equal to or less than 180&#xb0;, the distance (SS(i)) between each of the at least three vertices (V(i)) and a straight line (L) connecting the two vertices (A, B) is shorter than &#xbd; of the distance between the two vertices (A, B), and the inside angle of the vertex (C) with the smallest inside angle among the at least three vertices (V(i)) is larger than the inside angles of the two vertices (A, B). Vertices (VI) are present on the perimeter segment including the at least four sides, respectively between the vertex (C) with the smallest inside angle among the at least three vertices (V(i)) and one (A) of the two vertices (A, B), and between the vertex (C) with the smallest inside angle and the other (B) of the two vertices (A, B), said vertices (VI) having inside angles larger than the inside angle of the vertex (C) with the smallest inside angle.

Metallic hollow columnar member

When discretizing an analysis target part into plural elements and performing analysis, sheet thickness reduction rate or maximum principal strain at an equivalent position including a same element is compared by either a manner of combining two adjacent elements after the analysis or a manner of changing an element discretization size with two types and performing the analysis, and the element where the difference is large is extracted as a fracture risk portion. With this structure, a fracture risk portion can be extracted reliably when a fracture is predicted by a finite element method.

Fracture prediction method, processing device, program product and recording medium

Provided is a coupling structure between a front pillar and a side sill of an automobile, which improves the steering stability of the automobile and realizes a high productivity. A reinforcing memberis provided inside a front pillarhaving a closed cross-section so as to extend in the front-rear direction of the automobile. The reinforcing memberis coupled to a front pillar outer. An end portion of the reinforcing memberat the rear side of the automobile is extended toward a side sillto form a reinforcing member extension. The reinforcing member extensionis coupled to a side sill outer

Coupling structure between front pillar and side sill of automobile

A vehicular metal absorber for efficiently absorbing by a short stroke the impact energy received from legs of a pedestrian at the time of a collision between a pedestrian and an automobile, reducing the residual crush, and protecting the legs of the pedestrian, that is, a long vehicular metal absorber comprising a center flange, a top web and bottom web connected to the two sides of the center flange, a top flange connected to the top web, and a bottom flange connected to the bottom web and formed overall into a hat shaped cross-section, wherein an internal angle &#x3b1;formed by the top web with a flange plane including the top flange and bottom flange and an internal angle &#x3b1;formed by the bottom web with the flange plane are respectively over 0 degree to less than 90 degrees, and in that one or both of the top web and bottom web are provided with a recessed or projecting bead substantially parallel to a front-back direction of a vehicle.

Vehicular metal absorber, vehicular bumper system, automobile bumper absorber, and automobile bumper system

Growing community of inventors

Tokyo, Japan

Takashi Ariga