EFFECT OF CURRENT AND PULSE ON TIME ON MRR AND EWR FOR DIFFERENT INNER ELECTRODE SHAPE OF EDM PROCESS

Abstract

Electrical Discharge Machining (EDM) process is a non-traditional cutting for metals removing which is relied upon the basic fact that negligible tool force is produced during the machining process. The most significant factors of the cutting parameters are the material removal rate (MRR), electrode ware rate (EWR).The impact of various parameters such as (current and pulse-on time) are studied on the MRR, EWR in the present research. Five hollow geometric shapes (cylindrical solid, square, triangle, polygon and finally circular) were run by using EDM machine which used for cutting HSS with dielectric solution of translate oil by supplied DC current values (4, 10, and 16A). Voltage of (140V) uses to cut 3mm thickness of the steel and use the five copper electrode shapes. The results show that the electrode hollow square shape is the best electrodes used