the study of the effect of input parameters on material romoval rate, %tool water ratio and surface roughness of aisi h13 tool steel in the electrical discharge machining (edm)

in this study the effect of input parameters of the edm process (pulse on-time, duty cycle and tool polarity), on the material removal rate (mrr), tool wear ratio (twr) and maximum surface roughness (rmax) in the machining aisi h13 tool steel has been studied. this study shows that increasing the duty cycle in the two conditions of tool polarity, material removal rate and the maximum surface roughness are increased and the tool wear ratio is reduced. also in the positive polarity, by increasing pulse on- time, material removal rate and surface roughness are increased and tool wear ratio declines; but in the negative polarity by increasing pulse on time, material removal rate and surface roughness are first increased and then decreased. furthermore, based on results obtained in the negative polarity mode, on the low pulse on-time, material removal rate is high, and tool wear ratio is lower than positive polarity.