High-strength materials can be easily machined by spark erosion process to obtain complex shapes. The discharge energy can be characterized by the current flowing through the dielectric medium in spark erosion process during the machining. The performance measures such as workpiece erosion, tool electrode erosion, and surface finish can be modified by the properties of tool electrode material. This current is determined by the conductivity of the tool electrode material. The erosion process has been experimentally investigated to analyze the effects of tool electrode on machinability of AISI 202 stainless steel in the present study. Copper, brass, and tungsten carbide have been used as the tool electrode with different combinations of electrical input parameters. From the results, it is observed that tool properties of tool electrode material could have an influence on machining characteristics in spark erosion process. Copper tool could give higher material removal rate, whereas tungsten carbide could produce better surface finish after machining process.
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Muthuramalingam et al. (2013) studied this question.
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