OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 4 3 a b c Fig. 5. Radial force (Fr) varying with (a) V, (b) f, and (c) d f = 0.1 mm/rev, respectively. The feed forces can be noticed as increasing with the feed and depth of cut and being negligibly affected by the cutting speed. Lower feed forces are observed for PVD-AlTiN coated (C) tools and higher forces are observed for MTCVD-TiCN/Al2O3 coated (MTCVD) tools. However, no prominent difference in the feed force can be noticed for coated and coated-microblasted tools. The radial forces can be noticed as negligibly affected by the cutting parameters. Higher radial forces can be seen for MTCVD-TiCN/Al2O3 coated (MTCVD) tools. Figs. 6 and 7 depict surface roughness and tool life, respectively, for coated (C), coated-microblasted (CMB), and MTCVD tools, varying with V = 300 m/min, f = 0.1 mm/rev, and d = 0.3 mm, respectively. It can be seen that the surface roughness decreases with increasing V (fig. 6, a) and increases with increasing f (fig. 6, b) and d (fig. 6, c). Lower surface roughness can be seen for PVD-AlTiN coated (C) tools and higher surface roughness for MTCVD-TiCN/Al2O3 coated (MTCVD) tools. Surface roughness is significantly affected by feed, especially for MTCVD-coated tools. However, there is no significant difference between coated tools and microblasted tools. a b c Fig. 6. Surface roughness (Ra) varying with (a) V, (b) f, and (c) d a b c Fig. 7. Tool life (T) varying with (a) V, (b) f, and (c) d
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