Surface roughness analysis of hardened steel using TiN coated ceramic inserts Online publication date: Tue, 05-May-2015
by Sudhansu Ranjan Das; Amaresh Kumar; Debabrata Dhupal
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 17, No. 1, 2015
Abstract: The present investigation is to explore the consequences of cutting parameters (v, f, d) on surface roughness (Ra) by employing combined techniques such as orthogonal array and analysis of variance in turning of hardened AISI 4140 steel with PVD-TiN coated mixed Al2O3+TiCN ceramic inserts under dry environment. The results show that feed is the principal cutting parameter influencing Ra, followed by cutting speed. The machined surface characterisation has been investigated in this study, along with optimisation and development of mathematical model for Ra. Additionally, the effect of tool wear on Ra has been studied. The experimental data were further analysed to predict the optimal range of Ra. Finally, based on response surface methodology (RSM) a mathematical model is developed for Ra with 95% confidence level. The effectiveness, adequacy and statistical significance of the developed model has been checked using ANOVA analysis, Anderson-Darling test and normal probability plot.
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