Aisin Takaoka Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippon Steel Sumitomo Metal Corporation

Yuki Ishiguro

Shinichi Suzuki

Hiroshi Sato

Toshimasa Tomokiyo

Masaaki Kondo

Koichi Nishizawa

Katsunori Ishiguro

Kiyoshi Nonomura

Masashi Ozawa

Shunji Mashio

Hideaki Ikezawa

Takayuki Suzuki

Hideyuki Kai

The infrared furnace includes a plurality of infrared lamps arrayed on one surface side of a work and a reflective surface provided on its opposite surface side. Outputs of the infrared lamps are locally adjusted, or intensity of the infrared rays incident on one work surface is locally adjusted by a member disposed between the infrared lamps and the one surface of the work. In this manner, variations in strength may be imparted to one and the same car part.

Infrared furnace and method for infrared heating

The purpose of the present invention is to obtain a vehicle body component such that problems relating to conventionally proposed technology can be solved, thereby preventing increases in the number of components or manufacturing steps for reinforcement, for example. A bumper reinforce () includes a first component () and a second component () that are formed from channel steel with approximately U-shaped lateral cross section, and is configured by connecting the ends of the components (). Connecting portions () of the first component () and the second component () respectively have slits () along a direction in which the components () are arranged. The components () are connected with the components () overlapping each other in a staggered manner on both upper and lower sides across the slits ().

Vehicle body component

A current density changing portion is formed in a heating process on an upper base side with respect to a center portion of a flat metal plate in a direction of current flow, by passing current from a lower base side to the upper base side of the flat metal plate which is rectangular when viewed from above. As a result, a quenchable portion is formed on the upper base side with respect to the center portion of the flat metal plate in the direction of current flow, and a non-quenchable portion is formed on the lower base side with respect to the center portion of the flat metal plate in the direction of current flow. The flat metal plate is press-formed after the heating process, so a complex die cooling structure is not necessary during press-forming, which enables the die cost to be reduced.

Press-forming method and press-formed part

A high-strength quenched formed article has a zinc plating layer which is formed at a post-quenching formed steel sheet surface, and which contains 30 g/mor more of a phase that contains 5% or more by mass but 30% or less by mass of Fe, and which also contains 0.15% or more by mass but less than 2% by mass of at least one of Al and Si in a separate fashion or a composite fashion, and contains Zn, which makes up substantially a rest portion of the zinc plating layer, and an inevitable impurity, wherein the high-strength quenched formed article has a high-strength portion having a post-quenching-formation tensile strength of 1000 MPa or more, and a low-strength portion having a post-quenching-formation tensile strength of 800 MPa or less.

High-strength press hardened article, and manufacturing method therefor

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Chiryu, Japan

Yuki Ishiguro