Showa Aluminum Corporation

Honda Giken Kogyo Kabushiki Kaisha

Yasushi Tashiro

Yasushi Nakazawa

Tadashi Yasuoka

Ryotatsu Otsuka

Hideo Shingu

Kozo Arai

Masashi Sakaguchi

Kenji Tsukamoto

Masayoshi Ohashi

Osamu Watanabe

Hitoshi Kazama

Toshio Nishide

Akio Sugiura

Sliced workpieces severed from a metal extrusion transversely of it and into a desired thickness, or bent ones made from the extruded metal pipes, are restrained at their regulated correct positions each in its entirety or in part. Subsequently, the workpieces are compressed in a direction to the thickness or in the direction perpendicular to the primary bending direction. Plastic deformation of or exceeding 0.5%, or more preferably 2-5%, will be produced in each workpiece. Alternatively, those sliced or bent workpieces may be pressed in a direction to that of thickness or in the direction perpendicular to a previous bending, after each workpiece is restrained in its entirety or in part at the regulated correct dimension.

Method of correcting the dimension of workpieces

In a method of producing twisted aluminum products, an elongate heat-treatable aluminum article is twisted at first to have a value 'tan .phi.' of 0.5 or more, with the term .phi. denoting a helical angle of the thus twisted article. The twisted aluminum article is then subjected to a solid solution treatment and the step of aging, in this order.

Method of producing twisted aluminum articles

To obtain a high-purity aluminum fraction from aluminum containing both eutectic impurities and peritectic impurities, the contents of these impurities in the original aluminum are reduced by melting the original aluminum to obtain molten aluminum, adding boron to the molten aluminum, and rotating a cooling body as immersed in the boron-containing molten aluminum while introducing a cooling fluid to the interior of the body to crystallize high-purity aluminum on the surface of the body. The peritectic impurities react with the boron to form metallic borides, which are centrifugally forced away from the cooling body by the rotation of the body without being incorporated into the aluminum crystallized on the surface of the body. The eutectic impurities are removed from the crystallized aluminum on the surface based on the principle of segregation.

Process for producing high-purity aluminum

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Oyamashi, Japan

Yasushi Tashiro