Study of 3D Surface Machined on Cemented Carbide by Dry EDM

Abstract

In dry electric discharge machining of cemented carbide, short circuits frequently occur between work and tool electrodes, disrupting the process. In this study, to increase the efficiency of electric discharge frequency and increase work removal rate, we researched the effects of superposed voltage, ultrasonic vibration, high peak current, and mist supply. As a result, it was found that applying superposed voltage and ultrasonic vibration can increase work removal ratio. A long pulse and a low peak current are more appropriate than a short pulse and a high peak current for dry electric discharge. Moreover, by supplying mist into the working gas, the electric discharge process becomes more stable, the consumption of the electrode is lower, and a larger work removal ratio can be expected.