Komatsu Corporation

Komatsu Industries Corporation

Toyota Jidosha Kabushiki Kaisha

Hirohide Satou

Kiyokazu Baba

Hiroaki Honma

Masahide Sunata

Hajime Yoshida

A die cushion padis divided into four small padsand a large pad. With this arrangement, a load applied to an action point of each of the small padscan be equalized by the large pad, and an overturning moment arising between the action point and a reaction force point that equates the center of the small padcan be canceled, thereby preventing flexure of the small pad. Accordingly, since flexure of the cushion pin and the like can be prevented, there is no risk that the cushion pin is frictioned against the penetrating hole of a bolster, and the lifting operation can be smoothly performed, whereby a higher-accuracy pressing forming operation can be realized.

Die cushion device

A pressing machineincludes: a bedon which a die-cushion deviceis provided; and a bolsterprovided on the bed. The bedhas an inner spacein which a die-cushion padof the die-cushion deviceis lifted up and down. A supporting portionpenetrating the die-cushion padin a lifting direction and supporting a lower surface of the bolstervia a carrieris provided in the inner space. With this arrangement, since the bolsteris supported by the supporting portion, the bolstercan be prevented from being flexed during a press forming operation, whereby a highly accurate press forming operation can be realized. In addition, since the supporting portionpenetrates the die-cushion pad, unlike conventional arrangements, the die-cushion paddoes not need to be divided, whereby a complication of the arrangement can be avoided.

Pressing machine with die cushion device

Growing community of inventors

Komatsu, Japan

Hirohide Satou