Nippon Steel Corporation

Yoshiyuki Kaseda

Yoshiaki Nakazawa

Kenichiro Otsuka

Takahiro Aitoh

Atsushi Ono

Takeshi Kawachi

Toshiyuki Niwa

Yutaka Mikazuki

Yusuke Tsunemi

Nobuyuki Maniwa

The present invention provides a hot-stamping formed article made of steel, in which the hot-stamping formed article has at least one of a tensile strength of 1200 MPa or more and a martensitic steel structure and includes a first portion, a corner portion, and a second portion, which are sequentially continuous from one end portion to the other end portion in a longitudinal direction, each of the first portion, the corner portion, and the second portion includes a top sheet and two vertical walls connected to the top sheet when viewed in a cross section perpendicular to the longitudinal direction, the second portion includes a first outwardly-extending flange adjacent to the vertical wall, and the corner portion includes a vertical flange extending from the vertical wall of the first portion, a second outwardly-extending flange adjacent to the vertical wall located on an outer peripheral side of the corner portion out of the two vertical walls, and a transition portion in which the vertical flange and the second outwardly-extending flange are continuous.

Hot stamping formed article and method and device for manufacturing hot stamping formed article

A break prediction method according to the present invention predicts a break of a joint portion of an object to be analyzed including a pair of members joined to each other by using a finite element method, and includes a first step of acquiring at least an element size of a base material portion, from among parameters set in an element model for the object to be analyzed; a second step of calculating, as a break discernment standard, a break limit moment defined by a function including the element size of the base material portion as a variable; and a third step of discerning whether the moment applied to the joint portion in a deformation analysis of the element model for the object to be analyzed exceeds the break limit moment, and outputting the result of the discernment as a break prediction result for the joint portion.

Break prediction method, break prediction device, program, recording medium, and break discernment standard calculation method

This door inner panel is a door inner panel formed of a metal sheet and includes a first panel portion having a first top sheet portion and a first standing wall portion connected to the first top sheet portion, a second panel portion having a second top sheet portion disposed with a gap with the first top sheet portion of the first panel portion and a second standing wall portion connected to the second top sheet portion, a flange portion connected to the first standing wall portion and the second standing wall portion, and a flat sheet portion disposed between the first panel portion and the second panel portion, the first standing wall portion and the second standing wall portion respectively have a level difference portion, and both ends of the flat sheet portion are integrated with the flange portion or the level difference portions.

Door inner panel and method for manufacturing door inner panel

In a deformation simulation of a member joined by spot welding, an effective width being a width in a direction intersecting a direction of a load centered on a spot welded portion () on a flange face () where the spot welded portion () is provided of a member () and changing correspondingly to a change in the load is calculated every predetermined time interval, and fracture of the spot welded portion () is predicted using the calculated effective width. This configuration enables precise fracture prediction of a spot welded portion where spot welding is modeled, for example, in a case of performing collision deformation prediction of an automobile member on a computer.

Fracture prediction method and device, program, and recording medium

The panel-like formed product includes a polygonal top board, two or more vertical walls, and a flange. The vertical walls extend from two or more sides of the top board, and include at least two adjacent vertical walls extending from at least two adjacent sides of the top board. The top board includes a frame portion, and a concave portion which is located at an inner side of the frame portion. The two or more adjacent vertical walls include a first vertical wall section, a stair, and a second vertical wall section. The stair connects to a lower end of the first vertical wall section. The second vertical wall section connects to an outer edge of the stair. The flange connects to a lower end of the second vertical wall section.

Panel-like formed product, vehicle door, and method for manufacturing a panel-like formed product

A production method of a wheel rim includes: a step of forming a cylindrical rim material into a rim shape; and a step of increasing a sheet thickness of at least one opening end edge of the rim material at least one of before and after the step of forming of the cylindrical rim material. In addition, in the step of increasing of the sheet thickness, in a state in which the opening end edge is inserted into an annular groove of a die provided with the annular groove which is wider than the sheet thickness of the opening end edge, a thickened portion is formed by exerting a compressive load in an axial direction of the rim material on the opening end edge.

Growing community of inventors

Tokyo, Japan

Yoshiyuki Kaseda