Process parameter improvement for NITi’s electrical discharge machining (EDM) process utilizing the TOPSIS approach

The current work focuses on finding the ideal set of Electro Discharge Machine (EDM) process variables for machining Shape memory alloy (NiTi). NiTi alloy is a significant class of smart material with several unique properties. There are numerous uses for NiTi in the security, marine, biomedical, and aerospace industries. NiTi is particularly difficult to cut using conventional machining methods due to its hardness; nevertheless, the material can be removed using an electric discharge machining technique. The experiments were carried out using Taguchi’s L27 orthogonal array. A Multi-criteria decision-making (MCDM) technique known as TOPSIS is used to optimize the response performance variables of material removal rate (MRR) and surface roughness (SR). TOPSIS combines multiple objectives into a single objective and provides the optimum set of parameters, From the optimization results, the optimal combination of process parameters is obtained at Voltage=30V, Discharge Current= 20A, Ton=35µs, Toff=8µs. Confirmatory experiments show a satisfactory improvement of preference values utilizing TOPSIS in the EDM experimental and initial settings of 1.82.