| 摘要 |
PURPOSE:To judged the propriety of a machining condition without lowering machining speed and prevent the damage of an electrode by judging the condition between electrodes with a value obtained by dividing the removing quantity per unit time of a workpiece machined by electric discharge with an average machining current as an evaluating value. CONSTITUTION:A control command signal generating device 18 has a detected current receiving means from a current detector 17, a current averaging means, a machining speed detecting means, and a means of obtaining a current efficiency by dividing a machining speed with an average machining current. And, it further has a comparing means for comparing the obtained current efficiency with a reference value and a gap-between-electrodes condition judging means for judging the condition between electrodes, and the like, and feeds signals to a control means 15, a machining power source 16, etc. Due to such a structure, when the control means 15 received an abnormality judging signal from the gap-between-electrodes condition judging means, it controls so as to recover the condition between the electrodes, thereby, preventing the accident of the damage of wire electrode 2 without lowering machining speed.
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