DEVICE AND METHOD FOR ELECTRIC DISCHARGE MACHINING

摘要

A device for electric discharge machining comprising a discharge detector (30) for detecting discharge generated in a machining gap; a pulse generator (41) for generating a pulse signal adapted to stop functioning in response to the discharge detector after discharging starts; first switching circuits (22A, 22D) for applying to the machining gap a voltage pulse of one of polarities in response to a pulse signal; second switching circuits (22B, 22C) for applying to the machining gap a voltage pulse of the other polarity in response to a pulse signal; a flip-flop (46) for maintaining one of two states; gate circuits (42, 43) for supplying a pulse signal to the first switching circuits when the one state is held in the flip-flop, while supplying a pulse signal to the second switching circuits when the other state is held therein; circuits (CK, 48, 49) for supplying a high-frequency pulse to the flip-flop during duration of the pulse signal; a circuit (44) for supplying a single pulse to the flip-flop every time the supply of pulse signals halts; and a machining current supply circuit (10) for supplying machining current to the machining gap in response to the discharge detector after discharging has started.