| 摘要 |
A die cushion device of a pressing machine, wherein a controller controls the opening of a proportional flow control valve to a proper opening to control a flow flowing out from the lower chamber of a hydraulic cylinder supporting a cushion pad before a slide collides with the cushion pad by using a die cushion pressure instruction instructed from an instruction device beforehand and a slide speed signal inputted from a slide speed detector. Thus, the occurrence of a surge pressure produced when the slide collides with the cushion pad at a high speed can be suppressed.
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