study on parameter’s optimization for the minimizing of the residual stress in powder mixed near-dry electric discharge machining

The products processed by electrical discharge machining (edm) leave some undesirable eects, the most prominent of which is residual stress (rs). these rs aect fatigue behavior, dimensional stability, and stress corrosion. the latter is the cause offailure of processed products. it has been observed that products obtained by powder mixing near dry electric discharge machining (pmnd-edm) have relatively low rs values. the purpose of this research is to minimize the rs caused in the machined workpiece (en-31) by optimizing the process parameters that signicantly aect the machiningcharacteristics. the selected parameters were tool diameter, mist ow rate, metal powder concentration, and mist pressure, and the selected workpiece was en-31 because it has ideal mechanical properties and is widely used in manufacturing. the minimum value ofrs at optimized values of process parameters was found to be 106.32 mpa.