An experimental investigation during Electro Chemical Discharge Machining of e-glass fibre reinforced polymer composite

摘要

This paper reports the experimentally investigated results during electrochemical discharge machining (ECDM) of e-glass fibre reinforced polymer composite. The effect of ECDM input parameters such as DC voltage, electrolyte concentration and gap between tool electrode (cathode) and auxiliary electrode (anode) i.e. inter electrode gap on material removal rate (MRR) were analyzed through different graphs. Taguchi method based design of experiment, L_9(3~4) orthogonal array, analysis of variance (ANOVA), signal to noise ratio (dB) were employed to carry out the experiments, identify the significant parameters and optimize the input parameters respectively for various responses. Test results show that the DC voltage and electrolyte concentration are most influential parameters on MRR. The optimal parametric combination for high MRR was found at 75 V dc supply voltage, 85 g/l electrolyte concentration and 140 mm gap between cathode and auxiliary anode with brass tool electrode. The surface characteristics of the machined hole and tool electrode were analyzed by scanning electron microscope (SEM) and explained in the paper.