OBRABOTKAMETALLOV Vol. 27 No. 2 2025 technology This observation indicates that the cutting speed depends on the length of the boring tool for ensuring vibration-free processing. Nevertheless, it should be noted that reducing the cutting speed negatively affected productivity: the duration of the machining increased by 1.5 times. The results of the experiments are presented in Figs. 3 and 4. Analysis of these data shows that as the feed rate increases, the deviations from roundness and cylindricity also increase. This trend holds true for both aluminum alloy and structural steel workpieces. Additionally, machining on different centers exhibited some differences. Machining aluminum workpieces on the DMU 50 ecoline center resulted in lower deviations from roundness and cylindricity compared to the results obtained on the DMC 635 V ecoline. The resulting holes were measured to assess the accuracy of the diametrical size and to determine the accuracy of the axis positioning. Measurements were taken in three sections, uniformly distributed along the entire length of the hole, using a measuring probe. The results of the axis positioning accuracy assessment using the boring method, regardless of the feed rate, fall within the following limits: – for the DMU 50 ecoline machining center – 13 μm in diametrical terms. Fig. 3. Graph of the dependence of deviation from roundness on feed rate per revolution Fig. 4. Graph of the dependence of the deviation from cylindricity on feed rate per revolution
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