Parametric Optimization of Rotary Electro-Discharge Machining of Oil Hardened Non Shrinkage Steel Material with Sensitivity Analysis

Optimization tool used in industrial area for increasing quality of product by reducing the cost of product. In this paper, the experimental investigation of material removal rate (MRR), electrode wear rate (EWR) and surface roughness during machining on OHNS Steel by using copper electrode on EDM machine. The input parameters used for experimental work are Peak Current (Ip), Pulse-On (Ton), Pulse-Off (Toff) and Rotation of ram. Based on the input parameters, the design of experiments are L9 orthogonal array. The optimization has been carried out by using Taguchi method as well as Grey relational analysis or Multi response optimization. Firstly single optimization has been carried out and then Multi response optimization has been carried out, for that Grey relational generation and coefficient are find out and then Grey relational grade is carried out. Then the confirmation experiments are carried out. According to this machining parameters are carried out to be optimized for combined objectives of higher MRR, lower EWR and lower SR. The results obtained from this optimization shows that GRA is very effective optimization technique than Taguchi method. Sensitivity analysis also used as a post analysis method