| 摘要 |
Pressing of workpieces by means of a press, in which a work cycle which is controlled by means of the control device (50) with consideration of the positional values which are determined by means of the position measuring device comprises a pressing stroke, a decompression operation and a controlled return stroke, wherein a) during the pressing stroke, the first delivery device delivers medium (M) from the medium reservoir (5) into the first part chamber (31) in order to build up a hydraulic pressing pressure and the valve (4) is closed and the pressing tool is pressed against the workpiece, b) during the decompression operation, the valve is closed and the first delivery device is switched off or is switched to low-torque operation, c) during the controlled return stroke, the second delivery device delivers hydraulic medium from the medium reservoir (5) into the second part chamber and the valve is opened again, with the result that the working body and the ram are raised back into the starting position again or else into another starting position, and hydraulic medium (M) which is displaced through the open valve (4) flows out of the second part chamber into the medium reservoir. |
