Gohsyu Co., Ltd.

Shigeru Nishigori

Katsuyoshi Kondoh

Yoshinori Goho

Toru Akita

A method for producing a high strength workpiece material includes the steps of: placing an alloy materialinto a central space of a cylindrical mold; vertically compressing both end faces of the material in the central space with a press memberand a first support member, thereby causing one lengthwise end of the material to flow radially outward along an end face of the cylindrical moldto form an expanded part; bringing the press memberinto contact with a lengthwise end face of the expanded part so as to press the expanded part against the end face of the cylindrical mold; and increasing the distance between the press memberand the end face of the cylindrical moldwhile decreasing the distance between the press memberand the first support member, thereby continuously causing the radially outward flow from one end to another end of the material to gradually increase the thickness of the expanded part.

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Yasu, Japan

Shigeru Nishigori