Abstract
Due to low thermal conductivity and high chemical reactivity, the aerospace alloy Ti-6Al-4 V has a high cutting temperature and poor machinability in metalworking operations. It results in poor workpiece quality and low tool life, which increases the processing costs. Therefore, an efficient cooling-lubrication technique is requested to solve this problem. Herein, a new system, supercritical CO2 mixed with nanofluid minimum quantity lubrication (SCCO2-NMQL), is used for the cutting process. Supercritical CO2 (SCCO2) produces a low-temperature jet field because of the Joule–Thomson effect after injection and delivers the nanofluids deep into the cutting zone for cooling and lubricating during the cutting process. In this work, the effectiveness of SCCO2-NMQL cooling-lubrication in turning Ti-6Al-4 V was compared with that of other lubrication conditions (i.e., dry cutting, SCCO2, and supercritical CO2 mixed with minimum quantity lubrication (SCCO2-MQL), respectively), in terms of cutting zone temperature, cutting force, surface roughness, and tool wear. In comparison with dry cutting, SCCO2, and SCCO2-MQL, the cutting temperature drops of SCCO2-NMQL are more than 25%, 15%, and 12%, respectively. The use of SCCO2-NMQL cooling conditions provides lower cutting force and a superior surface finish. Moreover, the SCCO2-NMQL cooling condition has the potential to offer a sufficient cooling-lubrication function to tool wear. Results of the work indicate that SCCO2-NMQL can act as an efficient cooling-lubrication technique.
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All data generated or analyzed during this study are included in this published article.
Abbreviations
- SCCO2-NMQL:
-
Supercritical CO2 mixed with nanofluid minimum quantity lubrication
- MQL:
-
Minimum quantity lubrication
- SCCO2 :
-
Supercritical CO2
- SCCO2-MQL:
-
SCCO2 mixed with minimum quantity lubrication
- LN2 :
-
Liquid nitrogen
- SiO2 :
-
Silicon dioxide
- SDS:
-
Sodium dodecyl sulfate
- v c :
-
Cutting speed (m/min)
- a p :
-
Depth of cut (mm)
- f :
-
Feed rate (mm/rev)
- F x :
-
Cutting force along the feed direction (N)
- F y :
-
Cutting force along the radial direction (N)
- F z :
-
Cutting force along the cutting speed (N)
- Ra :
-
Surface roughness of workpiece (μm)
- SEM:
-
Scanning electron microscope
- BUE:
-
Built-up edge
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Acknowledgements
The authors would like to thank the company Dongguan Armorine Machinery Manufacturing Technology Co., Ltd., China, for the supporting experimental equipment and technology.
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This research is supported by the National Natural Science Foundation of China (Grant No. [51905144]).
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Huang, H., Liu, ·., Zhu, L. et al. Cooling and lubrication performance of supercritical CO2 mixed with nanofluid minimum quantity lubrication in turning Ti-6Al-4 V. Int J Adv Manuf Technol 122, 2927–2938 (2022). https://doi.org/10.1007/s00170-022-10091-9
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DOI: https://doi.org/10.1007/s00170-022-10091-9