Surface Pattern and Machining Characters Analysis of Insulating Ceramics ZrO₂ Machined by EDM

Abstract

Advanced engineering ceramics is widely employed in modern industry. This paper investigates the electrical discharge machining (EDM) of ZrO₂-based ceramics by assisting electrode method. The theory of assisting electrode method is introduced. The machining mechanisms were investigated through the SEM micrographs, XRD analysis and the machining waveforms. Some ZrC material can be found on the machined surface. The SEM micrographs show that the material removal mechanisms change with the electrical parameters. A 30~50μm material changing layer can be found on the machined surface through the SEM micrographs. Some work-pieces have been machined successfully by the assisting electrode method.