Gohsyu Corporation

Gohsyu Co., Ltd.

Yoshinori Goho

Katsuyoshi Kondoh

Kenji Tasaki

Toshinobu Miyata

Shigeru Nishigori

Toru Akita

A raw material of aluminum base alloy is extruded and formed by using a forming pattern comprising an upper pattern having plural through-holes for supplying the raw material into diaphragms of equal angles on the circumference and circular cylindrical protrusions positioned in the center of plural through-holes so as to be surrounded by plural through-holes at the exit side of the through-holes, and a lower pattern positioned in the concave portions commonly penetrating at the exit of the plural through-holes of the upper pattern, having through-holes for inserting the protrusions of circular circumference of the upper pattern by providing a tube forming gap, positioned in the center of concave portions of the concave portions in the circular columnar shape of the upper pattern.

Magnesium base alloy tube and its manufacturing method

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.

High strength workpiece material and method and apparatus for producing the same

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Shiga, Japan

Yoshinori Goho