Investigation of Effect of Machining Process Parameters on Surface Quality

Abstract

Machining method is the most commonly used manufacturing method in the industry. The product, which is chipped on the raw material with the help of a cutting tool is finalized. The energy required in all these processes is provided by CNC machines. The manufactured product must be within the dimensional and geometric tolerances determined by the designer in order to discharge its functionality. In addition to these tolerances, surface quality is expected especially for powertrains, linear guides, pistons, sealing surfaces, control gauges. In this study, the effect of the process parameters on the surface quality of the milling operation, which is the most commonly used machining method was investigated as experimentally. GG25 cast iron material was used as test material. Experimental design was carried out by using Taguchi L18 orthogonal array and the effect of four process parameters on the surface quality was investigated. ANOVA was carried out in order to investigate the effect of process parameters on experiment results and their statistical significance. The validity of experimental model was investigated by comparing the actual experimental results with the estimated results obtained by Minitab 19. Actual experiment results were converted to S/N ratios by using Taguchi’s smaller is better function and optimum levels of each process parameter on the surface quality were determined.