This paper focuses on studying the effect of cutting parameters, including cutting speed (V), feed rate (f), and cutting of depth (t) on the surface microhardness in turning SUS304 austenitic stainless steel. The measured results from the experiments based on the Box-Behnken design (BBD) show that the microhardness increases with the increase of all input parameters. Use analysis of variance (ANOVA) to determine the contribution of each parameter to the output indicator. The analysis results demonstrate that the feed rate has the most significance in the generation of surface hardness (42.92%), followed by  the cutting speed (33.51%), while the depth of cut has less significance (5.82%). The mathematical model of the relationship between the cutting parameters and the surface microhardness is developed based on the response surface methodology (RSM) to predict surface microhardness values.

Keywords: Analysis of variance; Box-Behnken design; Response Surface Methodology; Microhardness.