The master's thesis presents the optimization of machining parameters by selecting the appropriate milling head. The goal of optimization is to achieve a flatness of 0.025 mm with the highest possible productivity. The workpiece is made of forged steel 25MnV5 (1.1197) on which we perform frontal milling. Using the DOE experiment design method, we tested three milling heads by varying feed rate and speed. The paper describes the properties of the material used, CNC milling machine, milling heads, the process of planning experiments, preparation of experimental samples, flatness measurements and optimization of cutting parameters. From the results, we found that with all milling heads we can achieve the main straightness requirement, but with different machining parameters. Milling heads have a different response of the input characteristics to the flatness of the machined surface. Through analyzes, we determined which milling head can achieve the required flatness in the fastest time.
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