Toyota Jidosha Kabushiki Kaisha

Aichi Steel Corporation

Fine Sinter Co., Ltd

Tomoyasu Kitano

Akira Murakami

Toshihiro Aoyama

Shinichi Itou

Nobuyuki Shinohara

Toshiya Yamaguchi

Eisuke Hoshina

Hisanori Koma

Junghwan Hwang

Yusuke Oishi

Kazuhiro Kawashima

Takeyuki Uenishi

Susumu Owaki

Kazuhiro Tanahashi

A forged component having a chemical composition including, by mass %, C: 0.30 to 0.45%, Si: 0.05 to 0.35%, Mn: 0.50 to 0.90%, P: 0.030 to 0.070%, S: 0.040 to 0.070%, Cr: 0.01 to 0.50%, Al: 0.001 to 0.050%, V: 0.25 to 0.35%, Ca: 0 to 0.0100%, N: 0.0150% or less, and the balance being Fe and unavoidable impurities, and satisfying formula 1. Metal structure is a ferrite pearlite structure, and a ferrite area ratio is 30% or more. Vickers hardness is in the range of 320 to 380 HV. 0.2% yield strength is 800 MPa or more. A Charpy V-notch impact value is in the range of 7 to 15 J/cm.

Forged component, method for manufacturing the same, and connecting rod

A method for manufacturing a powder for a magnetic core including at least a process of performing a siliconizing treatment on a surface of an iron powder containing elemental carbon. In the process of siliconizing treatment, a powder containing at least a silicon dioxide is brought into contact with the surface of the iron powder, elemental silicon is detached from the silicon dioxide by heating the powder of silicon dioxide, and the siliconizing treatment is performed by causing the detached elemental silicon to permeate and diffuse into a surface layer of the iron powder. The invention provides a method for manufacturing a powder for a magnetic core, by which loss reduction is achieved.

Powder for magnetic core, method for manufacturing powder for magnetic core, and dust core

By pouring, by means of pressure, melted liquid of magnesium or magnesium alloy into a hollow portion which is formed using a casting mold, a valve body where a channel groove for hydraulic oil for use in a speed change operation of the automatic transmission is formed. In the above, the channel grove for the hydraulic oil is formed due to a convex portion which is formed on the mold so as to project into the hollow portion. As the magnesium has small heat capacity, variation of the temperature of the mold during the cooling and heating cycle can be suppressed. Moreover, as the magnesium melted liquid has no reactivity with respect to the casting mold, the convex portion is not deteriorated. This allows employment of a mold having a thinner convex portion formed thereon, and therefore formation of a valve body having a narrower channel groove.

Control valve body of automatic transmission and manufacturing method therefor

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Nisshin, Japan

Tomoyasu Kitano