Performance of Electroplated Copper Coating on Graphite Electrode in EDM Process

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Nattawut Chindaladdha
Don Kaewdook


Electrical Discharge Machining (EDM) is a nonconventional manufacturing process whereby a desired shape is obtained by using electrical discharges. Material is removed from the workpiece by current discharges between tool-electrode and workpiece, separated by a dielectric liquid. Copper electroplating is the process to produce a layer of copper on the surface of the substrate in this research was used graphite which is the tool-electrode. The study aims to investigate the performance of EDM product which used graphite coated with the copper layer. The experiment designed by using Taguchi-grey relational approach based multi-response optimization to find the optimal electroplating parameters. The considered electroplating parameters including 3 parameters 2 levels, current density 3.7 A/dm2 and 5.4 A/dm2, electrolyte concentration 0.1 mol and 1.0 mol, plating time 3 hours and 5 hours. The electrode's machining performance of the surface roughness (SR) of workpiece, tool wear rate (TWR) and material removal rate (MRR) will be investigated and compared with the conventional copper electrode.


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