US 8,166,791 B2 · Die cushion device

Abstract

A die cushion pad 13 is divided into four small pads 15 and a large pad 16. With this arrangement, a load applied to an action point of each of the small pads 15 can be equalized by the large pad 16, and an overturning moment arising between the action point and a reaction force point that equates the center of the small pad 15 can be canceled, thereby preventing flexure of the small pad 15. 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.

Claims20

Dependent claims

A pressing machine, comprising:

a bed having an inner space and a rib that partitions the inner space into a plurality of small spaces;
and
a die-cushion device comprising:
a plurality of small pads applied with a pressing force of a slide via a cushion pin;
a large pad supporting the plurality of small pads;
and
a plurality of biasing force generating units, each controlled by an electric motor, for moving the large pad up and down while generating an upward biasing force against the pressing force,
wherein a die cushion pad is provided by the small pads and the large pad,
wherein the die-cushion pad is arranged in the inner space of the bed, and
wherein the small pads are movable up and down in the small spaces partitioned from the inner space of the bed by the rib.

7 more elements

Dependencies are inferred from the claim text.

Die cushion device

Life of this patent

Die cushion device

Life of this patent

Abstract

Claims20