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Sumitomo Metal Industries, Inc.

Nozomu Ariyasu

Satoshi Matsumoto

Kouichi Kuroda

Keisuke Nagashima

Chon Chen Lin

A process for making a work piece from a &#x3b2;-type titanium alloy material includes subjecting the &#x3b2;-type titanium alloy material to cold working with controlling the reduction rate thereof to vary the reduction rate depending on a position across a plain direction of the &#x3b2;-type titanium alloy material, and then subjecting the &#x3b2;-type titanium alloy material to an aging treatment.

Process for making a work piece from a &#x3b2;-type titanium alloy material

A method of manufacturing a curved metal plate includes pressing a metal plate made of a plate material selected from titanium or titanium alloy with a die segment that forms thereon a convex surface curving in at least one direction and at least one recess, with a first side of the metal plate in contact with the convex surface, thereby curving the metal plate along the convex surface while allowing a part of the plate material on the first side of the metal plate to intrude into the at least one recess under pressure, thus forming at least one rib on the first side of the metal plate.

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Osaka, Japan

Nozomu Ariyasu