Paper Title
Specification of Optimum Parameters in The Machining of Aerospace Materials

In this study, nickel based super alloy Rene 41 aerospace material was chosen as machining test material, the effects of cutting speed on cutting forces and surface roughness were investigated based on Taguchi experimental design. Tree different cemented carbide cutting tools were used in experiments as KCU10, K313 and KCU25. The effects of machining parameters were investigated using Taguchi L27 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio which is calculated for average surface roughness and cutting force according to the "the smaller is better" approach. Using results of analysis of variance (ANOVA) and signal-to–noise (S/N) ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. Main cutting force, Fz is considered to be cutting force as a criterion. It has seen that while cutting speed and feed rate has higher effect on the cutting force, the feed rate and cutting speed more effect on average surface roughness. At the machining of Rene 41, optimum parameters for the cutting forces was found 0,150 mm/rev. feed rate, 90 m/min. cutting speed and KCU 10 cutting tool. For the surfage roughnes 0,125 mm/rev. feed rate, 60 m/min cutting speed and KCU 25 cutting tool was found better parameters for Rene 41 material. Keywords - Machinability, Taguchi method, Surface roughness, Cutting force, Rene 41