Control of Wire Breakage during Wire EDM -1st Report: Monitoring of Gap Signals According to Discharged Location-

Abstract

In the present report, we investigate about three gap monitoring signals: ignition delay time, discharge voltage and a radio signal in order to pre-monitor wire breakage during wire EDM. A new detecting method dividing these signals into groups depending on discharged position is proposed. The discharge voltage is found to be the best signal to pre-monitor the wire breakage. Furthermore the grouping method is useful to clarify an abnormal state of the gap. Finally, we discuss a model of wire breakage that is able to explain the obtained experimental results.