| 摘要 |
<p>Control is performed so that a constant pressing force can be applied at all times when a die tool presses a work. The magnitude of a pressing force when a die tool presses a work during pressing is detected by a semiconductor strain gage (84), and the thus detected pressing force is compared with a preset pressing force by a control device. If this comparison finds a difference between the both pressing forces, then a screw bar (35) is turned by an AC servomotor (24) to adjust the length of a bottom ram (60), thus controlling a pressing force. <IMAGE></p> |
