RESEARCH FOR IMPROVEMENT OF THE SURFACE FINISH OF SKD61 STEEL USING OPTIMAL MILLING PARAMETERS BY TAGUCHI METHODS

Abstract

The surface finish of SKD61 steel is improved by CNC milling. The Taguchi method was used to investigate optimal milling parameters. The optimal milling parameters were determined by the results of the Taguchi experiment and the ratio (S/N). Based on the results of the Taguchi L₉ experiment, the milling parameters are determined as follows: cutting speed of 63 (m/min), feed rate of 200 (mm/min), cut of depth of 0.25 (mm), materials of cutting tool: 4F hard alloy. The surface finish of the SKD61 steel was improved from 6.23 µm to 1.30 µm, corresponding to 79.1%.