Abstract
In this research study, Taguchi grey relational analysis (GRA) has been coupled with the technique for order of preference by similarity to ideal solution (TOPSIS) to optimize the multi-performance characteristics in WEDM of Al 7075 alloy. The influence of process factors such as pulse duration (Ton), pulse interval (Toff), flushing pressure (Fp), and servo voltage (Sv) on output responses machining speed (Vc) and corner inaccuracy (Ce) have been considered. The analysis of variance (ANOVA) for the grey relational grade (GRG) and order of preference value generated by TOPSIS have been carried out to justify the optimal results. The recommended input factor settings are found to be Ton = 1.1 µs, Toff = 20 µs, Fp = 9 kg/cm2, and Sv = 20 volt from TOPSIS, and from GRA is Ton = 1.1 µs, Toff = 10 µs, Fp = 12 kg/cm2, and Sv = 40 volt. Finally, surface roughness and surface topography evaluation have been carried out in-depth understanding of influencing factors.
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