Analyzing process variables for WEDM of Nimonic alloy 75 with a cryogenic treated tool

The present experimentation employs a Wire Electric Discharge Machining (WEDM) technique to investigate how various operational limiting factors influence Material Removal Rate (MRR), Micro Hardness (MH), and Vertex Angles (VA). Nimonic Alloy 75 sheets were used as the raw material for the experiments. Two types of tools were utilized: cryogenically treated brass wires and non-cryogenically treated brass wires. The primary process parameters analyzed in this research include the tool electrode, Ton, Wire Feed rate (WF), Wire Tension (WT), and Toff. The wire diameter was kept uniform at 0.25mm, as was the thickness of the work material Nimonic Alloy 75. The study compares MRR, MH, and VA when using a cryogenically treated tool versus a non-cryogenic tool, considering Ton, WF, WT, and Toff. The experimentations were structured with the help of a Taguchi L-9 OA, and an ANOVA was used to determine the maximum contribution of the variables: vertex angle, microhardness, and MRR. The microstructure of the machined samples, using untreated and CT brass wires, was examined with a Scanning Electron Microscope (SEM). Furthermore, chemical analysis was performed using EDS, comparing weight percentages before and after treatment.