Effect of Cutting Parameters on the Surface Roughness and Roundness Error When Turning the Interrupted Surface of 40X Steel Using HSS-TiN Insert

: This paper presents a research on investigating the effect of cutting parameters on the surface roughness (R a ) and roundness error (RE) when turning the interrupted surface of 40X steel. The TiN coated high speed steel (HSS-TiN) inserts were used in this research. The cutting parameters include cutting velocity, feed rate, and depth of cut. The Box-Behnken method was applied to develop an experimental matrix with fifteen experiments. The influences of cutting parameters on R a and RE were found using Pareto chart. Two equations that presented the relationship between Ra, RE and cutting parameters were established. These two equations were used to predict R a and RE. Genetic algorithm (GA) was also used to determine the optimal values of cutting parameters to simultaneously ensure the minimum values of R a and RE. The further works of this study was also mentioned in this paper.