Abstract
This article presents the tool life study of two different grades of Inconel 718. Tool life of ball nose cutting tools were investigated by considering the numerical parameters of cutting speed, feed rate, depth of cut and width of cut. The categorical factor is material grade. Two sets of different cutting parameters that were previously using design of experiment (DOE) approaches were combined and analysed using historical data of response surface methodology (RSM). This method can be used to determine the dominant factors to identify the interaction between cutting parameter and tool life. ANOVA result shows that the type of material with different grade is not significant in contributing to tool life compared to width of cut, cutting speed, feed rate, and depth of cut. The best combination for untreated Inconel 718 is Vc = 102 m/min, fz = 0.11 mm/tooth, ap = 0.52 mm and ae = 0.28 mm in order to obtain predicted too life of 127 min, whereas the best combination of double aging is Vc = 114 m/min, fz 0.11 mm/tooth, ap 0.61 and ae 0.21 to obtain 113 min of tool life. The study shows that Historical Data method is suitable for finding the optimization condition from different DOE approaches.
