Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Arcelor France

Eiji Isogai

Yutaka Mikazuki

Kenji Yamamoto

Riki Okamoto

Seiya Ishii

Koichi Sato

Masahiro Nakata

Tohru Yoshida

Hiroshi Yoshida

Masaaki Mizumura

Toshiyuki Niwa

Nobusato Kojima

Takashi Ariga

Yuichi Yoshida

In an impact-absorbing member which extends in a vehicle length direction of an automobile and whose both end portions in the vehicle length direction have a collision-side end portion and a non-collision-side end portion whose positions become mutually different when seen from the vehicle length direction, an outer member and an inner member of the impact-absorbing member are formed so that a position of a gravity center at the collision-side end portion and a position of a gravity center at the non-collision-side end portion become mutually different according to a positional relationship between the collision-side end portion and the non-collision-side end portion in order to suppress a tensile stress generated at the collision-side end portion and suppress a compressive stress generated at the non-collision-side end portion in a collision.

Impact-absorbing member and side member of automobile

This supporting structure for an underrun protector includes a stay body that connects a beam and a frame to each other; a stay reinforcing body that reinforces the stay body from an outside in a vehicle width direction; and a gusset provided between the stay reinforcing body and the beam. A stay body web face of the stay body is provided with an opening part. A pair of wall face parts provided to extend outward in the vehicle width direction from both ends of the opening part in a vehicle forward-rearward direction is provided so as to face each other. Each of the wall face parts is provided at a height corresponding to an installation position of the gusset and abuts against an inner surface of the stay reinforcing body in the vehicle width direction.

Supporting structure for underrun protector

The present invention provides a method of manufacturing a press-formed product. The method includes: a first process of preparing a material that is long in a first direction, and when viewed in a cross-section perpendicular to the first direction, the cross-section is a hollow cross-section that is long in a second direction perpendicular to the first direction; and a second process of bending the material in a direction intersecting the second direction when viewed from the first direction, by pressing the material along the second direction.

Method of manufacturing press-formed product, and press-formed product

[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

In performing burring processing on a sheet-like member, the following processes are performed: a punching process of performing punching processing of the sheet-like member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process; a re-punching process of performing punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process; and a burring process of pushing a portion surrounding a re-punched hole that is a punched hole formed by the re-punching process and forming a vertical wall.

Burring processing method

The present invention has its object to provide an efficient, general use shaping technique for forming high strength sheet metal into a three-dimensionally complicated shape. Further, the present invention provides a working apparatus for shaping sheet metal comprising a die (also called a 'punch') which has a shape suitable for a shape of shaped sheet metal, a plurality of rolls which grip sheet metal (H) with the die to shape the sheet metal, roll movement mechanisms which makes the rolls independently move in a horizontal direction and make them independently ascend or descend in a vertical direction, and a roll angle setting mechanism which can change an angle by which the rolls are pressed against the die.

Working apparatus and working method of sheet metal

A computer performs press forming analysis based on a shape of a formed product or of a member, a blank holder force, a friction coefficient, a tensile strength of a material, a yield strength, a stress-strain relation, and a sheet thickness, as press forming conditions, to calculate sheet thickness distribution and post-formation strain distribution of the formed product. The computer also performs performance analysis based on the sheet thickness distribution, the post-formation strain distribution, and the shape of the formed product or of the member, as state amounts of the formed product. This calculate performance of the member. The computer repeats the calculations performed in the process from the first step through the second step a predetermined number of times, with at least one of the press forming conditions being changed, to output an optimum press forming condition that gives a maximum value or a target value of the performance

Growing community of inventors

Tokyo, Japan

Eiji Isogai