Abstract
The enterprise carried out theoretical and experimental studies of face milling of hardened steel by the method of experiment planning. One of the tasks was to determine the deviation from the flatness of the processed surface of the samples and the construction of graphs and surfaces of the function of the mathematical model. For the tests, a milling machine and measuring equipment of increased accuracy, as well as a cutting tool with carbide plates, were used. As a result, a full factorial experiment was carried out, as independent variables were taken: cutting speed, feed per tooth and depth of cut. When determining the coefficients of the polynomial equation, a central compositional orthogonal design of the second order was used. Regression analysis was performed using Microsoft Excel, Wolfram Alpha and Statistica programs and a mathematical model of deviation from flatness was found, and the results of calculations were entered into the final table. On the basis of a mathematical model, in Microsoft Excel and Mathcad programs, graphs and hypersurfaces of a function are built for various interactions of variables. Significant variables were calculated for one-factorial and two-factorial influence on the response function.
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