| 摘要 |
A cushion load control device for a press machine includes a hydraulic cylinder 2 forming a die cushion, a hydraulic control valve 4 connected to the hydraulic cylinder 2, a hydraulic source 6 connected to the hydraulic cylinder 2 via the hydraulic control valve 4, an opening degree controlling part 11 for outputting a control signal for controlling an opening degree of the hydraulic control valve 4 on the basis of the set pressure value of the hydraulic cylinder, a speed detection unit 15 for detecting the lowering speed of the die cushion, and a signal correction part 18 for correcting the value of the control signal in accordance with the set pressure value and the lowering speed value detected by the speed detection unit 15.
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