| 摘要 |
A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL 1 , SYL 2 to which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL 1 , SYL 2 , based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYL 1 work as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYL 1 through the screw/nut mechanism and the slide.
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