OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 4 3 10 % for surface roughness and tool life. It demonstrates that, within the range of the chosen parameters and using different tools taken into account in the current study, the developed model could be used to accurately predict AISI 304 turning responses. Ta b l e 1 4 Validatory experimental matrix at optimum parameters [V (m/min), f (mm/rev), d (mm)] Optimum parameters Tool type Model results (Eq. 11–13) Experimental results Fc (N) Ff (N) Fr (N) Ra (µm) T (min) Fc (N) Ff (N) Fr (N) Ra (µm) T (min) [230, 0.055, 0.1] C 28.53 11.28 8.94 0.35 31.55 29 11 11 0.39 34 [200, 0.05, 0.1] C 28.15 10.82 8.96 0.38 37.70 33 14 10 0.33 36 [250, 0.055, 0.1] CMB 16.80 14.71 9.00 0.34 32.06 21 18 11 0.29 27 [200, 0.15, 0.2] CMB 17.60 14.70 8.71 0.39 40.36 21 17 12 0.36 36 [290, 0.05, 0.1] MTCVD 17.70 13.75 14.68 0.30 36.37 23 16 16 0.33 33 [200, 0.05, 0.1] MTCVD 21.20 14.23 15.48 0.37 51.14 24 19 17 0.39 47 This study strongly recommends MTCVD-TiCN/Al2O3 coated tools for finishing turning of AISI 304 stainless steel using V = 200–290 m/min and lower values of f and d. This study did not consider the tool wear effect on cutting forces and finds scope to model forces considering the tool wear effect in the turning of AISI 304 with differently pre-and post-treated coated tools. Conclusions In the current study, the dry turning performance of AISI 304 stainless steel with single-layer PVDAlTiN coated, single-layer PVD-AlTiN coated and microblasted, and MTCVD-TiCN/Al2O3 coated (MTCVD) tools is evaluated. The following conclusions can be drawn from the present study. 1. PVD-AlTiN coated tools provide the lowest cutting forces and surface roughness, followed by PVD-AlTiN coated-microblasted and MTCVD-TiCN/Al2O3 coated tools. However, these responses were marginally differed for coated and coated-microblasted tools. 2. The cutting forces decrease with the cutting parameters. However, this effect is significant for MTCVD-TiCN/Al2O3 coated tools. On the other hand, higher tool life is observed for MTCVD-TiCN/Al2O3 coated tools, followed by PVD-AlTiN coated-microblasted and PVD-AlTiN coated tools. 3. The correlation coefficients observed above 0.9 for the developed models showed that the developed models can be used reliably to predict the responses studied during turning AISI 304 within the range of the parameters considered in this study. 4. The optimization study reveals that turning of AISI 304 with MTCVD-TiCN/Al2O3 coated tools incurs lower cutting forces of 18–27 N, produces a minimum surface roughness of 0.3–0.44 μm, and has a better tool life of 36–51 min compared to PVD-AlTiN coated (C) and PVD-AlTiN coated-microblasted (CMB) tools. 5. This study strongly recommends MTCVD-TiCN/Al2O3 coated tools for finishing turning of AISI 304 stainless steel using V = 200–290 m/min and lower values of f and d. References 1. He H.B., Li H.Y., Yang J., Zhang X.Y., Yue Q.B., Jiang X., Lyu S.K. A study on major factors influencing dry cutting temperature of AISI 304 stainless steel. International Journal of Precision Engineering and Manufacturing, 2017, vol. 18, pp. 1387–1392. DOI: 10.1007/s12541-017-0165-6.
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