The present paper presents an experimental study on the performance evaluation of different electrode materials and dielectric fluids on high carbon high chromium (HcHcr) tool steel in electric discharge machining (EDM). Dielectric fluids (kerosene, distilled water, and EDM oil), electrode materials (copper, brass, and graphite) with current and pulse-on time are considered as input parameters while material removal rate (MRR), and surface roughness (R_a) as output parameters. HcHcr tool steel is used as work material due to its extensive use in aerospace, automotive, and tooling industries. Experiments are performed using Taguchi (L29) orthogonal array. Additionally, ANOVA analysis is performed to determine the most influencing parameters on the output. The results show that the electrode material is most influential for MRR, while dielectric fluid for R_a. Optimal setting obtained for MRR is electrode material (graphite), peak current (9 A), pulse-on time (50 µs), and dielectric (kerosene) and for R_a is electrode material (copper), peak current (3 A), pulse-on time (50 µs) and dielectric (kerosene). Similarly, the overall optimization is done via multi-objective optimization on the basis of ratio analysis method and optimal parameter setting obtained with graphite electrode, peak current (10 A), pulse-on-time (50 µs), and distilled led water as dielectric fluid. The microstructure of the machined surface is taken by scanning electron microscope to study the surface integrity and results revealed that smooth and uniform distribution of surface during the machining of HcHcr tool steel in EDM.

本文提出了一种在放电加工（EDM）中对不同电极材料和介电液在高碳高铬（HcHcr）工具钢上进行性能评估的实验研究。输入电流，脉冲接通时间的介电液（煤油，蒸馏水和EDM油），电极材料（铜，黄铜和石墨）被视为输入参数，而材料去除率（MRR）和表面粗糙度（R _a）作为输出参数。由于HcHcr工具钢广泛用于航空航天，汽车和工具行业，因此被用作工作材料。使用田口（L29）正交阵列进行实验。此外，执行ANOVA分析以确定输出上影响最大的参数。结果表明，电极材料对MRR的影响最大，而介电流体对R _{a的影响最大}。MRR的最佳设置是电极材料（石墨），峰值电流（9 A），脉冲接通时间（50 µs）和电介质（煤油），R _a是电极材料（铜），峰值电流（3 A），脉冲接通时间（50 µs）和电介质（煤油）。同样，基于比率分析法和石墨电极，峰值电流（10 A），脉冲接通时间（50 µs）和蒸馏水等的最佳参数设置，通过多目标优化进行整体​​优化。介电液。用扫描电子显微镜对加工表面的显微组织进行了研究，结果表明，在电火花加工中对HcHcr工具钢进行加工时，表面光滑均匀。