Experimental and Statistical Investigation of Ra in Turning of AISI 4140

In this study, 48 HRC hardness AISI 4140 is turned on in different cutting parameters and cooling environment. The Taguchi L9 test design was developed based on the three-level cutting speed (V), feed rate (f), depth of cut (a) and cooling environment parameters. According to the L9 experimental design, the mean surface roughness (Ra) values were measured. Chip form occurring during turning is photographed. The S/N (Signal/Noise) ratios of the Taguchi experiment design in the Minitab program have been determined. According to the experimental results, the most significant effect on the Ra from the four factors was found in the hand made by the depth of cut. In ANOVA, it was respectively determined that depth of cut, cutting speed, feed rate and cooling environment affected 95% confidence in Ra value. It has been found that the repeat experiments for the optimum parameters yielded about 90% accuracy compared to the Taguchi estimate.

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