Influence of Electrical Resistivity and Machining Parameters on Electrical Discharge Machining Performance of Engineering Ceramics

摘要: Engineering ceramics have been widely used in modern industry for their excellent physical and mechanical properties, they are difficult to machine owing high hardness brittleness. Electrical discharge machining (EDM) is the appropriate process engineering provided electrically conducting. However, electrical resistivity of popular higher, there has no research on relationship between EDM parameters ceramics. This paper investigates effects such as tool polarity, pulse interval, electrode material, ZnO/Al2O3 ceramic's performance, terms material removal rate (MRR), wear ratio (EWR), surface roughness (SR). The results show that great influence performance. ceramic with up 3410 Ω·cm can be effectively machined by copper electrode, negative shorter interval. Under most conditions, MRR increases, SR decreases decrease resistivity. Moreover, interval affect EWR, respectively, a combined effect EWR. Furthermore, performance higher than 687 obviously different from lower Ω·cm, when changes. microstructure character analysis shows removed melting, evaporation thermal spalling, working fluid graphite transfer workpiece during ceramic.