2002 年 68 巻 12 号 p. 1575-1579
In order to monitor amount and extent of damage on a surface of a workpiece, without removing a tool electrode from the workpiece, a new monitoring system for electrical discharge machining is developed. This system detects the discharge location and monitors whether each discharge is normal or abnormal. The monitored signals and the discharge location are displayed on a CRT display during machining. The damaged portion and the extent of damage on the surface of the workpiece are determined without stopping the machining operation or removing the tool electrode from the workpiece. It is useful to determine the cause of abnormal discharges and decide appropriate countermeasures based on the results of this monitoring system. This paper describes the detected accuracy of discharge location and the relationship between the damaged surface and the monitored signals are investigated.