Press brake and method of controlling bidirectional fluid pump of hydraulic cylinder of press brake
A controller for a press brake controls a servomotor to reverse the rotation of a bidirectional piston pump so as to reverse the vertical movement of a hydraulic cylinder and a ram. A command generator maintains a constant speed for a predetermined warmup time or distance after the ram movement is r...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A controller for a press brake controls a servomotor to reverse the rotation of a bidirectional piston pump so as to reverse the vertical movement of a hydraulic cylinder and a ram. A command generator maintains a constant speed for a predetermined warmup time or distance after the ram movement is reversed, and afterwards changes the ram speed to a predetermined speed. A ram position, set according to a moving speed pattern, is compared to the actual position of the ram to conform the ram to the moving speed pattern. The moving speed may be limited based on at least one of a pressure and a detected by a pressure sensor. |
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