The material removal rate (MRR), along with the
electrode wear rate (EWR), plays an important role in
analysing machine output during electrical discharge
machining. This work focuses on the improvement of
machine output by introducing an induced magnetic field
on the workpiece during rotary electrical discharge machining (REDM) of EN-8 steel with a rotary copper
electrode. The workpiece was placed inside the induced
magnetic field, wherein polarity of the magnetic field gets
reversed periodically. Using Taguchi’s recommended design
of experiments, we initially conducted experiments
with eight input parameters at different levels . Significant
parameters were identified with the help of the signal-tonoise
ratio and ANOVA. Finally, another set of experiments
was conducted for analysis of the process and development
of empirical expressions for MRR and EWR. Experimental
results established that rotary electrical discharge machining with a polarity reversal magnetic field delivers better machining output than machining in a non-magnetic field.Thus, this work benefits the EDM process by reducing the machining costs and by producing better geometrical
trueness on workpieces, as MRR increased and EWR
decreased
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