Effect of wire coating on the wire EDM performance characteristics during the machining of Inconel 718

P.M., Abhilash and Chakradhar, D. (2019) Effect of wire coating on the wire EDM performance characteristics during the machining of Inconel 718. In: International Conference on Precision, Meso, Micro and Nano Engineering, 2019-12-12 - 2019-12-14, Indian Institute of Technology Indore.

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Abstract

The current work aims to investigate the effect of wire electrode coating, wire EDM process parameters like pulse on time, pulse off time, servo voltage and wire feed rate, on the performance characteristics like cutting speed, surface roughness and flatness error. Inconel 718 superalloy is chosen as the work material, the wire electrodes considered for the study are uncoated brass and zinc coated brass wires having a diameter of 0.25 mm. Grey relational analysis is performed to optimize the process parameters for maximizing machining performance and the results are verified by conducting confirmation experiments. L18 orthogonal array was considered to perform the experiments. The effects of wire coating was analyzed separately on each response. Wire coating was found to have a significant effect in improving the cutting speed and surface quality. Optimized process parameters improved surface roughness and profile accuracy by 6% and 37% respectively with an overall improvement of 8.6% in grey relational grade.

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