| 摘要 |
PURPOSE:To improve machining precision at a corner part, by providing a control device which predicts a change in a machining amount at a corner part and corrects a change in a gap between the sides of electrodes occasioned by a change in a machining amount. CONSTITUTION:A control device 14 selects the gain of a new interpole servo for machining a preset corner part by means of a signal from a discriminator 12, indicating that a present position is under circular movement of a corner part, and a signal from a discriminator 13, indicating that present machining is finish machining. The control device switches the gain of the interpole servo, and restores the gain of the interpole servo to its original value upon completion of machining of the corner. Since, for example, in the case of machining of the in-corner, with the increase in a machining amount, a gap between the sides of electrodes is increased to cause overcut, to control device 14 prevents the occurrence of phenomenon, in that a machining speed is excessively decreased at the in-corner, by switching the gain of the interpole servo to a low value, resulting in correction of overcut by a machining integration effect.
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