Mazda Motor Corporation

Keylex Corporation

Imanishi Manufacturing Co., Ltd.

Sekisou Kanagata Co., Ltd.

Kouji Hironaka

Kenichi Hatakeyama

Kyousou Ishida

Shinichiro Kurusu

Tekkan Takasue

Akihiro Nakashima

Takuya Yamazaki

Toshiharu Nakashima

Consumed energy is minimized to reduce running cost. Final formed products of uniform quality are successively obtained. High productivity is provided. A primary forming step of obtaining a primary formed product by plastically working a heated steel sheet with a primary forming die set for a predetermined time period, a secondary forming step of machining the primary formed product with the secondary forming die set for a predetermined time period to obtain a secondary formed product, and a hardening step of allowing a cooling die set placed in a hydraulic press controlled by a servomotor to hold the secondary formed product under pressure for a longer time period than the time period of each of the primary and secondary forming steps to obtain a hardened final formed product are successively performed in sequence. The hardening step is performed independently without coordinating with the primary and secondary forming steps.

Method for forming steel sheet by hot pressing

Growing community of inventors

Hiroshima, Japan

Kouji Hironaka