OBRABOTKAMETALLOV technology Vol. 25 No. 3 2023 Fig. 3. Representative volume of AMg3 alloy with surface machined by a grinder with a 40 grit band for all materials, as shown in fig. 3. Therefore, the simulated processes can be considered in the context of comparison with a theoretical model in a flat setting. The created solid models were analyzed in separate sections through a step of 100 µm to establish the average values of the actual ratio of height to asperity base width H/W or the actual value ½ ctg(α), where α is the asperity top angle. An example of the analysis of cross sections of representative volumes of materials after different types of surface machining is shown in fig. 4. As can be seen in fig. 4, the surface profile of materials after machining is a set of randomly arranged figures of various shapes and sizes. Based on visual observation, the most suitable geometric figures for describing the section of surface profiles are triangles and trapezoids. The results of estimating the surface profile parameters α and H/W are summarized in Table 1. It can be seen that the same type of surface machining creates different surface profiles depending on the material, which is primarily due to the strength characteristics and hardness of the materials being machined. The softer the material (annealed D16 in our case), Fig. 4. Cross-sections of representative volumes of AMg3 and D16 alloys after grinding with 40 and 120 grit bands
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