269-275Inconel 718, a Nickel based super alloy
which has wide applications in aerospace industry particularly in the hot
sections of gas turbine engines due to their high temperature strength and
corrosion resistance. It is known as being among the most difficult-to-cut
materials. This paper presents an optimum process parameters (speed, feed and
depth of cut) to minimize the cutting force, surface roughness and tool flank
wear together in CNC high speed dry turning of Inconel 718 using Taguchi method
based Grey relational analysis. The study involved nine experiments based on
Taguchi orthogonal array and the result indicates that the optimal process
parameters are 60 m/min for speed, 0.05 mm/rev for feed and 0.2 mm for depth of
cut from the selected range. Also the significant process parameters have been
found out for the above process optimization by performing ANOVA. Confirmation
tests with the optimal levels of cutting parameters are carried out in order to
illustrate the effectiveness of the method