Influence of Machining Parameters on the Surface Roughness Obtained When Milling AISI 4140 Steel
This study aims to investigate the influence of machining parameters on the surface roughness Ra produced during the milling of AISI 4140 steel (42CD4). The material used has undergone a heat treatment of quenching and tempering at different temperatures. The tests have been conducted using the unifactorial and multifactorial method (Complete factorial design with eight combinations). The results obtained show that with the increase in the frequency of rotation N, the roughness Ra decreases and the surface roughness improves. At a N=700 rpm speed, the roughness has been recorded at a 550 °C tempering is six times and seven times respectively, higher than the ones obtained at 300 and 200°C and that the hardness decreases with the increase in temperature T. In addition, the analysis of variance ANOVA has showed that the feed rate f is the most significant factor followed by the rotation frequency N. The correlation coefficient R2 of the roughness Ra determined by the ANOVA is very satisfactory and testifies the good adequacy of the proposed model.
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