Abstract
The paper deals with EDM assisted with ultrasonic vibrations of the electrode. A first part introduces the beneficial effect of ultrasonic vibrations: increased feed rate by a better flushing, particularly for difficult conditions such as finishing with narrow gap: lower damage due to heating (thinner recast layer, increased fatigue life). This is a continuation of the paper introduced at CIRP 1989. A second part shows the results of an experimental investigation of the technique using a synchronization of ultrasonic vibrations and EDM pulses. This allows knowing more about the relationship between the pressure in the bubble and the effect of the discharge. A theoretical approach is proposed to explain this phenomenon.
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