| 摘要 |
<p>The piston rod (8) of a feed drive (7) supported in the machine frame (2) carries an infeed drive (13) guided on the machine frame and having the electrode (16). The feed drive (7), infeed drive (13) and a hydraulic clamp (18) fitted between the piston rod (8) and the infeed drive (13) are connected to the pressure network via control valves (20, 22, 24). To reset during the operation, the feed drive (7) is moved into the desired end position by the admission of pressure to the infeed drive (13) via a valve (22). Jumping of the electrode (16) during starting is avoided here by a flow-regulating valve (32) to which pressure is admitted before starting and by a restrictor (34) in the feed (28). The synchronisation with the control of the control valve (22) is taken care of by its process computer. Since this device only needs one guide, it is simpler and more accurate compared with known devices. <IMAGE></p> |
