A Parametric Optimization & Experimental Analysis of Wire-edm on Hastelloy-c22 by Taguchi Method

WEDM is a one of the non-conventional machining processes used for machining complex shape components and hard materials to produce intricate shapes on the wide variety of materials. With the increasing demands of high surface finish and high rate of MRR of complex shape geometries, WEDM machining process is now being replaced by non-traditional machining processes. According to this paper, optimization of wire electrical discharge machining (WEDM) process parameters such as , Peak Current (Ip), Servo voltage (SV) and wire tension (WT) to yield maximum material removal rate (MRR) and minimum surface roughness (SR) of Nickel based alloy, Hastelloy C-22, a very high temperature, corrosion resistant alloy. The machining experiments were carried out according to the Taguchi parametric design (L9). Analysis of variance (ANOVA) was used to find the significance of each process parameter. Optimal results have been verified through confirmation experiments. The results indicate that Ton is the most significant factor influencing the MRR and Peak Current (Ip) is most significant factor influencing the SR followed by Servo voltage (SV) and wire tension (WT). After observing the significant factors for MRR and SR, a multiple response optimization technique (Assignment of Weights) is applied in this paper for getting optimal result for both MRR and SR. KeywordsWire EDM, Hastelloy C-22, Taguchi, Anova, Assignment of weights.