Optimization of machining parameters in Electric Discharge Machining of Magnesium and Aluminium by Taguchi Technique

Abstract

Aluminium, Magnesium and its alloys are preferred wheneverweight reduction is needed without compromising its strength. Both alloys have been used in numerous fields like in aerospace, defence field, automobile wheeling parts and also, they have been used in Medical field because of their biodegradability. In this study, Statistical investigation on surface roughness in Electric discharge machining of aluminium and Magnesium using Taguchi optimization Technique has been reported. Electric discharge machining was carried out under the condition of Current (5, 10, 15 A), Voltage (50, 55, 60 V), Pulse On time (10, 20, 30 µs) and constant flushing pressure of 0.50 Kg/sq.cm. Twenty-seven Experiments are carried out based on L27 orthogonal array. After machining the surface roughness (Ra, Rq, Rz) of the machined surface is measured using SURFTESTSJ-210. Optimizations of the results were done by Taguchi technique and the optimal parameters for the machining operation of aluminium and magnesium are determined. It is found that for Ra, Rq and Rz the most influencing factor is Current followed by the pulse on time, pressure and voltage.

Experimental Study on Optimization of Surface Integrity Parameters in Machining of Porous Titanium Alloys

“…Phase transformation will occur during the transient loading and heating stage and the rapid cooling stage, resulting in the phase change of the cutting layer. The structure changes, which affects the physical and mechanical properties of titanium alloys [4][5]. The work hardening of the workpiece surface will be affected by various factors such as deformation and thermal load.…”