Effect of cutting variables on bearing area curve parameters (BAC-P) during hard turning process

Hard turning is a machining process that is widely used in the precision mechanical industry. The characterization of the functional surface texture by the ISO 13565 standard holds a key role in automotive mechanics. Until now, the impact of cutting conditions during hard turning operation on the bearing area curve parameters has not been studied (ISO 13565). The three parameters R-pk, R-k and R-vk illustrate the ability of the surface texture to resist friction. In this work, the main objective is to study the impact of cutting conditions (V-c, f and ap) of the hard turning on three parameters of the bearing area curve. The statistical study based on response surface methodology (RSM), analysis of variance (ANOVA) and quadratic regression were performed to model the three output parameters and optimize the input parameters. The experimental design used in this study is the Taguchi L-25 orthogonal array. The results obtained show that the cutting speed has a greater effect on the bearing ratio curve (R-pk, R-k and R-vk) parameters with a percentage contribution of 37.68%, 37.65% and 36.91%, respectively. The second significant parameter is the feed rate and the other parameter is significant only in relation to R-pk and R-k parameters.