Multi-objective Optimization of AISI P-20 Tool Steel During Electrical Discharge Machining

“Electrical discharge machining (EDM)” has been recognized globally as a benchmark process for manufacturing. EDM can machine material components with intricate shape and difficult-to-machine materials with utmost ease. The process finds wide application in industries like mould making, aerospace, automotive, aeronautics, sports and nuclear. The present study focuses on the effect of process parameters like discharge gap current (Ig), pulse on time (Ton), pulse off time (Toff) and spark gap (SG) on material removal rate (MRR), surface roughness (SR) and diametral overcut (DOC) during EDM of AISI P-20 steel. The workpiece material demonstrates excellent properties and varied industrial uses. Experiments have been performed using Taguchi’s L27 orthogonal array with square-shaped copper as tool electrode and lateral flushing. TOPSIS has been used to simultaneously optimize the process parameters and obtain maximum MRR, minimum SR and OC. Confirmatory test was used to verify the result obtained.