AN INVESTIGATION OF THE INFLUENCES OF EDM PARAMETERS AND TOOL GEOMETRIES ON RADIAL OVERCUT FOR MONEL 400 MATERIAL WITH TUNGSTEN COPPER ELECTRODE

摘要

Electrical-Discharge Machining (EDM) is a nonconventional machining process utilizing an electric spark discharge from the negative electrode towards the positive work piece through the dielectric fluid. The Dimensional accuracy is very important consideration for the accuracy of the finished product. The objective of this experimental study is to determine parameters that offer the best dimensional accuracy in EDM. Discharge current(A), Pulse On Time(T_(on)), Pulse Off Time(T_(off))and Circle, Rectangle, Triangle and Square Tool Geometrical Shapes (Geo) are taken as machining parameters. The experimental investigations are carried out on Monel 400 material using Tungsten copper electrode. The response of Radial Over Cut(ROC) is considered for improving the machining efficiency. Optimal combination of parameters was obtained Taguchi Optimization technique. The confirmation experiments results shows that the significant improvement in ROC was obtained. ANOVA have been used to analyze the contribution of individual parameters on ROC. The experimental result demonstrates that the Taguchi method satisfies the practical requirements.