| 摘要 |
PURPOSE:To prevent the transition to abnormal electric discharge or the continuation of abnormal electric discharge and improve working speed by installing an electrode vertical-movement instruction signal apparatus for outputting a vertical movement signal into an electrode controller, in an electric discharge machine. CONSTITUTION:The terminal for outputting the number of abnormal electric-discharge wave-forms which is installed onto an electric-discharge state discriminating apparatus 19 and the terminal for outputting the number of electric-discharge wave forms in case when an electrode gap is contaminated are connected to the OR element 23 of an electrode vertical-movement instruction signal apparatus 21, and the logic sum of each number of both wave forms is outputted into a counter 25. The output A of the counter 25 is input into a comparator 27 and compared with a set value B, and when A is larger than B, the comparator 27 outputs a signal at H-level into one input terminal of an AND element 29. With such constitution, transition to abnormal electric discharge or the continuation of abnormal electric discharge can be prevented, and further working speed can be improved. |
