Aiming at the features of low efficiency of electrical discharge machining and difficult control of surface roughness of insulating ceramics, this paper proposes a capacitor discharge machining method. This method is to carry out experimental research and mechanism analysis on the effect of capacitor discharge on insulating ceramics removal volume by using high-capacitance capacitor to discharge for short time to auxiliary electrode and insulating ceramics and by the methods of changing capacitance, voltage magnitude, electrode size, type of working media, etc. The experimental results show that the maximum ceramics removal volume produced by capacitor discharge under the action of relevant parameters is 18.53 mm3. Through metallography effect analysis of insulating ceramics surface with microscope, it concludes that the material removal is mainly in stripping mode. The material removal volume increases as the discharge parameter increases, and it is more sensitive to some parameters, such as medium.
electrical discharge machining, insulating ceramics, capacitor, discharge channel
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