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Influence of EDM Process Parameters on Surface Roughness and Machining Time using JIS SCM420 low alloy steel by Response Surface Methodology

   Komal Jahagirdar


Electrical discharge machining is a nonconventional machining process which enables machining of complex and intricate shapes, hard materials that are precise and difficult to machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. The process involves spark erosion in the presence of dielectric fluid. This study investigates the effect of three input variables namely peak current (IP), pulse on time (Ton) and gap voltage (Vg) on surface roughness (Ra) and machining time (Tm) in electrical discharge machining. A face centered central composite design matrix is used to conduct the experiments on SCM 420 low alloy steel with copper electrode. The modeling of responses is done using RSM on experimental data. The significant coefficients are obtained by performing analysis of variance (ANOVA) at 95% confidence level. Finally, the parameters were optimized with the desired surface roughness and machining time value using desirability function approach.


Electrical discharge machining, machining time, Peak current, Response surface methodology, Surface roughness

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