Computational and Experimental Investigation of Thermal Generation in CNC Milling Machine Spindle Βearing with the Oil-Air Lubrication Method

Authors

  • Duc-Do Le School of Mechanical Engineering, Hanoi University of Science and Technology, Vietnam
  • Van-Hung Pham School of Mechanical Engineering, Hanoi University of Science and Technology, Vietnam
  • Tuan-Anh Bui School of Mechanical Engineering, Hanoi University of Science and Technology, Vietnam https://orcid.org/0000-0002-5630-0884
Volume: 14 | Issue: 1 | Pages: 12900-12905 | February 2024 | https://doi.org/10.48084/etasr.6603

Abstract

This study investigates the thermal generation dynamics in the spindle unit of a CNC milling machine. The main objective is to analyze the heat transfer from the bearings to the housing during operation, using simulations and experiments. An air-oil-cooled lubrication system is employed, which enables the airflow to dissipate some of the heat produced. Before conducting the experiment, heat generation and transfer are accurately predicted. The air-oil mixture, formed by pressurized air atomizing oil droplets, is effective in cooling high-temperature regions. A spindle ER16-80SK 24k is integrated with a CNC machine for real-time data acquisition, including parameters such as spindle speed and temperature. The results show significant temperature rises in all bearings, which reach a steady state after an hour of operation. There are noticeable differences in range, from 6.1% to 43.4%, between the experimental and simulated maximum temperatures, indicating possible real factors not considered in the simulation. The environmental impacts of oil particle emission are also discussed, which require proper ventilation management during operations. This research provides valuable insight into the thermal dynamics of CNC milling machine spindles and establishes a solid basis for further research and development in this important field of machining technology.

Keywords:

CNC machining, spindle unit, thermal generation, temperature monitoring, air-oil mixture lubrication

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References

X. J. Xuan, Z. H. Haung, K. D. Wu, and J. P. Hung, "Prediction of the Frequency Response Function of a Tool Holder-Tool Assembly Based on Receptance Coupling Method," Engineering, Technology & Applied Science Research, vol. 8, no. 6, pp. 3556–3560, Dec. 2018.

V.-H. Pham, M.-T. Nguyen, and T.-A. Bui, "Oil pressure and viscosity influence on stiffness of the hydrostatic spindle bearing of a medium-sized circular grinding machine," International Journal of Modern Physics B, vol. 34, no. 22n24, Sep. 2020, Art. no. 2040156.

N. B. Serradj, A. D. K. Ali, and M. E. A. Ghernaout, "A Contribution to the Thermal Field Evaluation at the Tool-Part Interface for the Optimization of Machining Conditions," Engineering, Technology & Applied Science Research, vol. 11, no. 6, pp. 7750–7756, Dec. 2021.

A. Zivkovic, M. Knezev, M. Zeljkovic, S. Navalusic, and L. D. Beju, "A study of thermo-elastic characteristics of the machine tool spindle," in 9th International Conference on Manufacturing Science and Education – MSE 2019 "Trends in New Industrial Revolution," 2019, Art. no. 01009.

L. Yu, Z. Xing, M. Gao, and L. Shang, "Research on the influence of spindle temperature rise of drilling and tapping machine on machining accuracy," Journal of Physics: Conference Series, vol. 1885, no. 2, Dec. 2021, Art. no. 022002.

T. H. Le, V. B. Pham, and T. D. Hoang, "Surface Finish Comparison of Dry and Coolant Fluid High-Speed Milling of JIS SDK61 Mould Steel," Engineering, Technology & Applied Science Research, vol. 12, no. 1, pp. 8023–8028, Feb. 2022.

A. D. Kara Ali, N. Benhadji Serradj, and M. E. A. Ghernaout, "Cutting Parameter Optimization based on Online Temperature Measurements," Engineering, Technology & Applied Science Research, vol. 13, no. 1, pp. 9861-9866, Feb. 2023.

T.-A. Bui and Q.-T. Vu, "A Study on an Oil-Air Mixed Lubrication Monitoring System for Spindle Unit of CNC Milling Machine," in Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020), B. T. Long, Y.-H. Kim, K. Ishizaki, N. D. Toan, I. A. Parinov, and N. P. Vu, Eds. 2021, pp. 920-928.

D.-D. Le, Q.-T. Vu, and T.-A. Bui, "Simulation and Experimental Study of Heat in Grease-Lubricated CNC Milling Machine Spindle-bearings," in Proceedings of the International Conference on Advanced Mechanical Engineering, Automation, and Sustainable Development 2021 (AMAS2021), B. T. Long, H. S. Kim, K. Ishizaki, N. D. Toan, I. A. Parinov, and Y.-H. Kim, Eds., 2022, pp. 462-467.

M. Handawi, A. E. I. Elshwain, M. Y. Noordin, N. Redzuan, and D. Kurniawan, "Comparison between Nitrogen-Oil-Mist and Air-Oil-Mist Condition when Turning of Hardened Tool Stainless Steel," Applied Mechanics and Materials, vol. 660, pp. 18-22, 2014.

O. Maeda, Y. Cao, and Y. Altintas, "Expert spindle design system," International Journal of Machine Tools and Manufacture, vol. 45, no. 4, pp. 537–548, Apr. 2005.

S. Li and Y. Wu, "A Study on Oil/Air Lubrication and Preload of a High Frequency Fully Ceramic Motor Spindle," in 2010 International Conference on E-Product E-Service and E-Entertainment, Henan, China, Aug. 2010.

C. Zhao and X. Guan, "Thermal Analysis and Experimental Study on the Spindle of the High-Speed Machining Center," AASRI Procedia, vol. 1, pp. 207-212, Jan 2012.

C.-H. Wu and Y.-T. Kung, "A parametric study on oil/air lubrication of a high-speed spindle," Precision Engineering, vol. 29, no. 2, pp. 162-167, Apr. 2005.

H. Liang, D. Guo, L. Ma, and J. Luo, "The film forming behavior at high speeds under oil−air lubrication," Tribology International, vol. 91, pp. 6–13, Nov. 2015.

D.-D. Le and T.-A. Bui, "Analyzing the Effects of Lubrication Techniques on CNC Spindle-bearing Heat: An Experimental Investigation," Engineering, Technology & Applied Science Research, vol. 13, no. 5, pp. 11581-11585, Oct. 2023.

T.-A. Bui, V.-H. Pham, D.-T. Nguyen, and N.-T. Bui, "Effectiveness of Lubricants and Fly Ash Additive on Surface Damage Resistance under ASTM Standard Operating Conditions," Coatings, vol. 13, no. 5, May 2023, Art. no. 851.

T.-A. Bui and N.-T. Bui, "Investigating the Impact of Fly-Ash Additive on Viscosity Reduction at Different Temperatures: A Comparative Analysis," Applied Sciences, vol. 13, no. 13, Jan. 2023, Art, no. 7859.

T. A. Stolarski, Ed., Tribology in Machine Design. Oxford: Butterworth-Heinemann, 1990.

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How to Cite

[1]
D.-D. Le, V.-H. Pham, and T.-A. Bui, “Computational and Experimental Investigation of Thermal Generation in CNC Milling Machine Spindle Βearing with the Oil-Air Lubrication Method”, Eng. Technol. Appl. Sci. Res., vol. 14, no. 1, pp. 12900–12905, Feb. 2024.

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