Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Takashi Hosoe

Shinichiro Nakamura

Akihito Sato

Atsunobu Murata

A sheet forming method including the steps of: holding a blank between a blank holder and an opposing die so that wrinkling is prevented in the blank; and forming the blank to an objective shape with a punch, while imposing a force of a variable bead on the blank at a selected position in a point manner and only during a part of the entire forming period selectively. An apparatus for conducting the above method.

Method and apparatus for sheet forming a blank using a variable bead

A method of effecting press working on a blank, in which a local portion of the blank is strengthened prior to the press working, so as to achieve increased mechanical strength, due to structural transformation of the material of the blank, or by an embossing operation. The local portion is selected so that the blank exhibits improved formability and suffers from reduced fractures during the press working.

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Toyota, Japan

Takashi Hosoe