This paper aims to investigate the optimization of process parameters of micro holes machining in Electric Discharge
Machining (EDM) for Stainless Steel grade 304 (SS 304) on the machining characteristics using the Grey Relational
Analysis (GRA) method. Twenty seven experimental runs based on the Orthogonal Array (OA) of Taguchi method have
been carried out. The multi-objective optimization of the process parameters such as Material Removal Rate (MRR), Tool
Wear Rate (TWR), Diametral Overcut (DOC) and Taper (T) has been performed. The current is identified to be the most influential
factor of the MRR, TWR and the T, and the pulse-off time has an impact on DOC. Furthermore, the analysis of variance
(ANOVA) is carried out to identify the most significant factor. The experimental results also examined the influence of
various process parameters through SEM micrographs. In this article, recent patents have been discussed.
Keywords: ANOVA, EDM, grey relational analysis, micro-hole, optimization, white layer.
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