Determination of electrical discharge machining performance of boron alloy steels

In this study, the machinability bor alloy steel material by electrical discharge machining method was investigated. Copper electrode was used as tool material and gas oil was preferred as dielectric liquid. During the experiments, three different parameters were selected as variables; discharge current, pulse on time and pulse off time The outcomes of machining parameters on material removal rate (MRR), electrode wear rate (EWR) and average surface roughness (Ra) have been investigated. Experiments were carried out by applying Taguchi's full factorial sequence. Experiments were carried out by applying Taguchi's full factorial sequence. Optimum levels of processing parameters were determined according to Taguchi full factorial methodology. As a result of the experimental studies; It has been observed that Material removal rate (MRR), electrode wear rate (EWR) and average surface roughness (Ra) increase with the increase of discharge current, MRR, workpiece surface roughness values increase with increasing stroke time. It has been determined that the ideal processing parameters for each processing level are at different levels. Ideal machining parameters for workpiece machining speed were found to be 12 A, 100 µs and 50 µs for current, pulse on time and pulse off time, respectively. Ideal machining parameters for surface roughness were determined as 12 A, 50 µs, and 24 µs for current, pulse on time and pulse off time, respectively. As a result of the experimental studies; It has been observed that Material removal rate (MRR), electrode wear rate (EWR), workpiece surface roughness increase with the increase of discharge current, IIH, workpiece surface roughness values increase with increasing stroke time.