Evaluation of machining performance and multi criteria optimization of novel metal‑Nimonic 80A using EDM

摘要

This study focused to machine novel Nimonic 80A through Electric Discharge Machine process. The process parametersare optimised to achieve high surface integrity along with high material removal rate (MRR) with minimum energy consumption.Central composite design along with analysis of variance technique has been applied to make correlationbetween the process parameter and responses. The developed model of surface roughness shows that the peak currentand pulse-on time have significant effect whereas; a little effect of pulse-off time. The said result may be obtained due tosimultaneous action of deposition and notching (removal) of material in order to form crater. In case of MRR, the pulse-ontime and peak current are found as significant factors with increasing trend (i.e. when the input values are increased theMRR increases) whereas; a reverse trend is noticed with pulse-off time. The optimum values for maximum MRR (0.512444gm/min) and minimum surface roughness (7.82203 μm) with 81% desirability are obtained for the process parameter as13.49 A peak current, 150 μs pulse-on time and 4 μs pulse-off time.