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Abstract

Electrical discharge machining (EDM) is among the most essential nontraditional machining processes. Material removal rate (MRR) and surface roughness are the two main parameters applied in this method. A desired surface roughness can be achieved at the maximal MRR by selecting the optimal input parameters. Because of the mechanical properties and hardness of shape-memory nickel titanium (NiTi) alloy, material can be removed using an EDM method. NiTi alloy is widely used in marine science and aerospace industries. Surface roughness is a critical parameter affecting the machining of this alloy. This study examined the effect the input parameters (pulse current, gap voltage, pulse on time, and pulse off time) on the output parameters (surface roughness and MRR) to determine the minimal surface roughness and maximal MRR for NiTi alloy. Accordingly, the Taguchi method and analysis of variance were employed to optimize the machining parameters. The modeling and experimental results indicate that pulse current and pulse-on time are the most critical parameters affecting MRR and surface roughness

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