OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 7 1 5 Based on the data acquired from the Contour ELITE optical microscope, the changes in the Ra and Rz parameters (units of measurement: µm) across the experimental steps are shown in Table 2. Fig. 11. The part prepared for measurements Ta b l e 2 Results of measuring Contour ELITE roughness indicators Parameters Point 1 Point 2 Point 3 Point 4 Rz on the y axis (μm) 26.186 21.347 22.898 18.152 Ra on the y axis (μm) 2.41 1.493 1.794 2.975 As the data in Table 2 reveals, there is no clear, consistent trend in the change of Ra and Rz. A significant increase in the arithmetic mean deviation of the profile from the mean line along the y-axis can be observed, with some fluctuations at the fifth step. However, the changes in Ra and Rz along the x-axis are not substantial, and, in general, these two indicators even decrease along this axis. In the case shown in Fig. 12, obtained at the second measurement point, the changes in the part’s profile along the feed direction (y-axis) are clearly due to the size of the tool’s step movement along the feed line. Decreasing the feed rate will reduce the Ra and Rz parameters along the y-axis, while increasing the feed rate will increase them. To illustrate this more clearly, a 3D model of the machined surface obtained on the Contour ELITE microscope at the second experimental point is provided (Fig. 13). Fig. 12. Photograph of the machined surface, obtained with a microscope Contour ELITE, after the first step of the experiment
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