Abstract
Wire electro-discharge machining (WEDM) is an extensively used non-conventional, thermo-electrical machining process where the generated energy from the electrical sparks that occur in the tool-workpiece interface melts and removes the metal from the workpiece. It is largely used in machining difficult-to-cut temperature-resistant alloys, which have high strength. The workpiece material is taken as AISI P20 tool steel, a special purpose tool steel that is used to make plastic dies and molds. This has high wear-resistance, toughness and hardness. Servo voltage (Sv), Peak current (Ip), Pulse-off-time (Toff) and Pulse-on-time (Ton) are taken as process parameters and Kerf Width (KW) together with Material Removal Rate (MRR) are considered as the responses. In order to attain the optimum processing condition, Fuzzy- Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), a hybrid multi-objective optimization technique is used.
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