Experimental Study of The Machining Parameters of The Computer Controlled Wire EDM to Improve The Surface Roughness of Nimonic 80 Alloy

In this current experimental study of machining the Nimonic 80-A alloy on computer-controlled wire EDM, the optimum set of input machining parameters are evaluated. This optimization has been done to improve the surface roughness of the Nimonic 80-A alloy. The four main input parameters like peak current (20-80A), gap voltage (30-60V), pulse-on time (20-70µs) and pulse-off time (25-75µs) are considered within this range. The different optimal levels of the parameters to be set on WEDM for doing the experiments were proposed by the Taguchi L27 orthogonal array. Talysurf tester has been utilized to compute the values of the surface finish. In the aftermath, the signal to noise (S/N) ratio has been adopted for optimizing the machining parameters with respect to surface roughness. This provided the interaction plots of the input factors with surface roughness. The optimum results of machining parameters obtained are peak current 20A, gap voltage 30V, pulse-on time 20µs and pulse-off time 75µs. Further the results of Taguchi analysis made it evident that the peak current is the influencing factor in improving the effectiveness and quality of surface finish.