OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 5 No. 4 2023 а b с Fig. 3. Tangential force (Fc) for different tools varying with (a) V, (b) f, and (c) d Further, for a better understanding, cutting forces (figs. 3–5), surface roughness (fig. 6), and tool life (fig. 7) are plotted using the developed models varying with cutting parameters for coated (C), coatedmicroblasted (CMB), and MTCVD tools. Fig. 3, a depicts tangential cutting forces for coated (C), coatedmicroblasted (CMB), and MTCVD tools varying with cutting speed at f = 0.1 mm/rev and d = 0.3 mm, respectively. The cutting forces can be seen as decreasing with the cutting speed. It could be attributed to an increase in the cutting speed increases the cutting temperature making the material soft and lowering the cutting force. Lower cutting forces can be seen for PVD-AlTiN coated (C) tools and higher forces for MTCVD-TiCN/Al2O3 coated (MTCVD) tools. However, no prominent difference in the tangential cutting force can be seen for the different tools. Fig. 3, b displays the tangential cutting forces that vary with feed for coated (C), coated-microblasted (CMB), and MTCVD tools at V = 300 m/min and d = 0.3 mm. And fig. 3, c depicts tangential cutting forces for coated (C), coated-microblasted (CMB), and MTCVD tools varying with depth of cut at V = 300 m/min and f = 0.1 mm/rev, respectively. Cutting forces increase with feed and depth of cut, and the effect is more pronounced for MTCVD-TiCN/ Al2O3 coated tools than for PVD-AlTiN coated tools (C) and PVD-AlTiN coated microblasted (CMB) tools. The lower cutting forces using PVD-AlTiN coated tools (С) and PVD-AlTiN coated microblasted (CMB) tools can be explained by the lower coefficient of friction and sharper edge radius of the single-layer PVDAlTiN coated tool compared to multilayer MTCVD-TiCN/Al2O3 coated (MTCVD) tools. The phenomenon of lower friction for PVD-AlTiN coated tools results in lower cutting force compared to MTCVD-TiCN/Al2O3 coated tools. Fig. 4, a and fig. 5, a depict feed and radial forces, respectively, for coated (C), coated-microblasted (CMB), and MTCVD tools, varying with cutting speed at f = 0.1 mm/rev and d = 0.3 mm, respectively. Fig. 4, b and fig. 5, b show the dependence of the feed force and radial force on the feed value at V = 300 m/min and d = 0.3 mm, respectively. Fig. 4, c and fig. 5, c depict feed and radial forces, respectively, for coated (C), coated-microblasted (CMB), and MTCVD tools, varying with depth of cut at V = 300 m/min and a b c Fig. 4. Feed force (Ff ) for different tools varying with (a) V, (b) f, and (c) d
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