Abstract

To clarify the electrical discharge machining (EDM) mechanism of insulated ceramics with an assisting electrode method, the waveforms and displacement curve of tool electrode were investigated during electrical discharge process, with emphasis on the following factors: (1) The effects of EDM conditions on machining rate, wear of electrode, surface roughness and stability of discharge. (2) The variation of discharge stability corresponding to the machining process. From the obtained results, it appeared that an electrical conductive layer was created on the machined surface by the generation of both long pulse and concentration discharge pulses. The surface roughness decreased with increasing the ratio of these abnormal pulses. To decrease the generation of abnormal pulses, machining was carried out in carbon-powder-mixed machining fluid. As a result, the surface roughness was markedly improved according to on increase of the normal discharge ratio and discharge dispersion phenomena.

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