Abstract
Abstract
The purpose of this paper is to identify based on the composite central factorial experiment, the mathematical model between the arithmetic mean deviation of the surface profile and the cutting process parameters (cutting speed, cutting depth and feed per tooth), which describes the studied system in any point of the chosen experimental domain. The coefficients of these equations represent the influence of the variables on the response. The analysis of the variance ANOVA is focused on estimating the different types of variability of the response and the estimations made with the Fisher test. This test analyses the coefficients significance of the regression equation, by comparing the ratio of two variants. The Fisher test indicate the probability to be a statistical difference between them or not. In any case, the experimental results are associated with experimental errors. It is essential to find the prediction accuracy of the coefficient’s values, and not only their absolute value. In the end, will be determined the arithmetic mean deviation of the surface profile Ra, based on the mathematical model, and will be compared with the experimental results.