Toyota Jidosha Kabushiki Kaisha

Other

Nippon Steel Corporation

Akio Hotta

Kouichi Mine

Takashi Saito

Yoshinori Shibata

Tadahiko Furuta

Kenji Shimoda

Toshiya Yamaguchi

Kazumasa Yamazaki

Tatsuya Kitamura

Takeshi Nishiwaki

Satoru Iwase

Takashi Haruta

The invention provides a process for forging a titanium-based material comprises the steps of: preparing a titanium-based sintered workpiece including at least one of ceramics particles and pores in a total amount of 1% or more by volume, the ceramics particles being thermodynamically stable in a titanium alloy; and heating the workpiece to a forging temperature and forging the same. In the production process, the pores or the ceramics particles inhibit the grain growth during forging. Accordingly, it is possible to carry out the forging at a relatively high temperature at which the titanium-based material exhibits a small resistance to deformation. Moreover, the titanium-based material can maintain an appropriate microstructure even after the forging. Consequently, the impact value and the fatigue strength are inhibited from decreasing.

Process for forging titanium-based material, process for producing engine valve, and engine valve

Nitriding steel excellent in formability and susceptibility to nitriding

A method for manufacturing a cup-shaped article includes making the thickness of a cylinder portion of a cup-shaped configuration uniform, between a step of drawing a flat plate material portion into a cup-shaped configuration and a step of ironing the cup-shaped configuration into a final cup-shaped article. Increasing the thickness may be performed by coining or axial compression. The thickness increasing step may be replaced by a step, provided prior to the drawing step, of providing a plate material portion having a greater thickness at a radially inner portion than at a radially outer portion.

Method of manufacturing a cup-shaped article

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Toyota, Japan

Akio Hotta