Realization of high discharge frequency LC generator for EDM

抄録

This paper aims to design a novel pulse generator for electrical discharge machining (EDM) which can generate more efficient pulse with high frequency. The LC generator which uses an inductor to store energy and a switch to control the gap voltage and current flowing through the gap can realize higher discharge energy per pulse even with a low voltage DC power supply and obtain large removal volume per discharge due to high rising speed waveforms. However, the discharge probability of the LC generator is low because the duration of open voltage pulse is significantly short and the ignition usually occurs after a random delay time. Hence, this paper proposed a kind of the modified LC generator in which a high impedance transistor pulse generator is used to ignite discharge followed by the main discharge current supplied from the LC generator to increase the discharge frequency.