Abstract
This study was performed to determine the degree of influence of the cutting parameters on the machining surface roughness when hole turning the heat-treated SKD11 steel at a hardness of 62 HRC. Three controllable factors-three levels (cutting speed, feed rate, and depth of cut) were used with the performance measurement that machining surface roughness. The results show that the feed rate has the greatest degree of impact on the surface roughness. And, the second and third factors affect on the surface roughness are cutting depth and cutting speed, respectively. The Genetic Algorithms and ANOVA method were used to determine the optimal value of the cutting speed, feed rate, depth of cut, and the optimum value of surface roughness. The optimum value of surface roughness is 0.47 μm that was obtained at cutting speed of 219.80 m/min at a feed rate of 0.05 mm/rev and a depth of cut of 0.299 mm.
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