Multi-superiority response optimization of WEDM for titanium grade-5 using PCA based TOPSIS theory

Abstract

Wire electrical discharge machining (WEDM) is a stochastic method in which an enormous number of mechanism limits are comprised. It is very precise to hand-pick the exact grouping of these factors to minimize surface roughness, kerf width, and maximize MRR. To yield excellent products at the least cost, optimization is one of the approaches that can be used to attain superlative engineering environments. The goal of this research is the relevance of PCA-based TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution) theory for multi-superiority reaction optimization whilst WEDM of Titanium Grade-5 alloy. The mechanism factors nominated for the research are time on, time off, gap voltage, cable tension, wire feed rate and current. Trials are planned by employing Taguchi’s L27 orthogonal procedure. PCA based TOPSIS theory is used to translate the multi-response problematic into an equivalent objective purpose (relative closeness coefficient). The optimal sets of machine variables are found as Time On 110 μs, Time Off 55 μs, Gap voltage 20 V, Current 210 Amp, Cable tension 2 g and Wire feed rate 5 m/min. Time on is found to be the most influencing factor on relative closeness coefficient values. Scanning electron microscopic research illustrates outsized quantity of sphere-shaped droplets, giant holes and lusterless face look which increases the surface inequality value (Ra = 2.47 µm) at higher input energy.