Grey-Taguchi optimization of machining of Inconel 600 using AlTiN coated carbide inserts under dry environmental conditions

The present study is about the optimization of machining parameters in turning of Inconel 600 alloy with AlTiN- coated inserts under dry environment to enhance surface finish and material removal rate (MRR). Taguchi single objective and Grey-Taguchi multi-objective methods were employed to achieve optimum machining conditions. Cutting speed, feed rate, and back rake angle were considered as machining process parameters. Based on design of experiments, Taguchi L27 orthogonal array with three factors and three levels was employed for the study. Results from Taguchi analysis indicate that cutting speed of 300 m/min, feed rate of 0.05 mm/rev, and rake angle of − 3° were the optimum machining parameters to achieve better surface finish whereas cutting speed of 300 m/min, feed rate of 0.15 mm/rev, and rake angle of − 5° were found to be the optimum machining parameters to maximize MRR. Feed rate has the maximum effect on both surface roughness (Ra) and MRR followed by cutting speed and rake angle. Results from Grey relation analysis indicate that cutting speed of 300 m/min, feed rate of 0.15 mm/rev, and rake angle of − 3° were optimum parameters to achieve better surface finish and maximum MRR with Grey relation grade (GRG) of 0.827. Grey-Taguchi analysis indicate that cutting speed of 300 m/min, feed rate of 0.1 mm/rev, and rake angle of − 3° were found to be optimum to maximize the mean of GRG and among the machining parameters, cutting speed has the maximum influence on the means of GRG followed by rake angle and feed rate.