Effect of cryogenic coolant on machinability of difficult-to-machine Ni–Cr alloy using PVD-TiAlN coated WC tool
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Alloys of nickel are optimal metals to use in turbine parts and aircraft components. They are generally accepted as difficult-to-machine materials, because of its poor thermal conductivity. The selection of coolant and machining conditions is crucial for better performance. Problems with conventional coolant are failure of lubrication at higher metal removal and cause environmental pollution. The heat produced at the cutting zone can shorten the life of the tool, which leads to dimensional imprecision. The current experimental investigation is machining of Nimonic 80A under the effect of cryogenic liquid carbon dioxide (− 79.5 °C) using PVD-TiAlN coated tungsten carbide (WC) insert, which is compared with conventional dry, flood, and MQL environments. The machining is carried at varying cutting speed ranging from 45 to 90 m/min, a feed rate of 0.06–0.08 mm/tooth, and a constant depth of cut of 0.75 mm. The results admitted that cryogenic cooling lessens the average roughness by 42–47% over dry cutting, 24–27% over wet cutting, and 16–21% over MQL. It is proved that cryogenic cooling produces greater compressive stress on the machined surface and brings down the flank wear by decreasing the temperature on the cutting zone.
KeywordsNimonic 80A Cryogenic carbon dioxide (LCO2) MQL Soya bean oil PVD-TiAlN
Minimum quantity lubrication
Liquid carbon dioxide
Depth of cut
Physical vapor deposition
The authors express their gratitude to thank the Head of the Department and the staff members of the Mechanical Engineering Department, Saveetha Engineering College, Anna University, Chennai, for lending support during experimentation.
- 10.Rahim EA, Sasahara H (2010) Effect of machining parameters and MQL liquids on surface integrity of high speed drilling Ti–6Al–4V. Adv Pre Eng 448:816–820Google Scholar
- 27.Jerold B Dilip, Kumar MP (2013) The influence of cryogenic coolants in machining of Ti–6Al–4V. J Manuf Sci Eng 138:1–8Google Scholar
- 31.Kim DY, Kim DM, Park HW (2018) Predictive cutting force model for a cryogenic machining process incorporating the phase transformation of Ti–6Al–4V. Int J Adv Manuf Technol 96:1293–1304Google Scholar