Experimental analysis of Inconel 625 alloy to enhance the dimensional accuracy with vibration assisted micro-EDM

With the continuous improvement in manufacturing processes there is an amalgamation of digital technology with traditional concepts. Electric discharge machining is one such example of it. The more industries digitalize it the more is the degree of automation. In present experimental work ZNC Electrical Discharge Machine has been used to perform the experiments. Total 18 experiments have been performed on Inconel 625 alloy as per the orthogonal array prepared by Minitab software. Tool electrode, peak current, pulse on time (T-on) and pulse of time (T-off) are considered as input parameters. There were two levels of tool and rest were assigned three levels. 9 experiments were conducted via copper tool without vibration and in remaining 9 experiments vibration assisted copper tool was used. Vibration was given to tool with coin vibration motor which was powered by battery. It was observed that when Toff was increased from 25 to 35 mu s the surface roughness enhances by 23.23%. Also, it was found that circularity improves by 25.85% when Ton is raised from 140 to 160 mu s. Surface roughness of each drilled hole was measured using surface roughness tester and circularity was measured using Quick Image. The FESEM and EDS has performed on the machined specimen to analyze the microstructure and chemical composition.