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IJAT Vol.13 No.5 pp. 602-609
doi: 10.20965/ijat.2019.p0602
(2019)

Paper:

Thermal Characteristics of Spindle Supported with Water-Lubricated Hydrostatic Bearings

Yohichi Nakao*,†, Rei Kirigaya*, Dmytro Fedorynenko*, Akio Hayashi**, and Kenji Suzuki*

*Kanagawa University
3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan

Corresponding author

**Kanazawa Institute of Technology, Nonoichi, Japan

Received:
February 11, 2019
Accepted:
June 5, 2019
Published:
September 5, 2019
Keywords:
thermal stability, hydrostatic bearings, spindle, power loss, cooling efficiency
Abstract

Characteristics of a spindle supported with water-lubricated hydrostatic bearings were experimentally investigated. In particular, this paper focuses on the thermal characteristics of the spindle. The flowrates of water as the lubricating fluid were measured separately for the radial and thrust bearings, in relation to the supply pressure. Fluid power losses owing to pressure losses of the lubricating fluid were then introduced. Furthermore, the power losses owing to the water viscosity were determined by measuring the spindle torque and angular velocity. The experiments revealed that the total power loss of the spindle is approximately 300 W. The cooling effect of the lubricating water was then examined by introducing a temperature increase between the supply and drain water. The experimental results verified that the water temperature increased by approximately 0.8°C, at a spindle speed of 3000 min-1. Based on the temperature increase of the water, the power removed from the spindle by the water flow was estimated. By comparing the generated total power loss and the power transferred by the water flow, the cooling efficiency of the flow of lubricating-water was defined in this paper. If the cooling efficiency is 100%, the temperature change of the spindle can be zero regardless of the power loss, achieving ideal thermal stability of the spindle. Experimental results revealed that the cooling efficiency of the tested spindle was over 80%. This indicates that the flow of water as a lubricating fluid removes generated heat from the spindle effectively, and achieves improved thermal stability of the spindle.

Cite this article as:
Y. Nakao, R. Kirigaya, D. Fedorynenko, A. Hayashi, and K. Suzuki, “Thermal Characteristics of Spindle Supported with Water-Lubricated Hydrostatic Bearings,” Int. J. Automation Technol., Vol.13, No.5, pp. 602-609, 2019.
Data files:
References
  1. [1] H. Mizumoto, Y. Tazoe, T. Hirose, and K. Atoji, “Performance of High-Speed Precision Air-Bearing Spindle with Active Aerodynamic Bearing,” Int. J. Automation Technol., Vol.9, No.3, pp. 297-302, 2015.
  2. [2] H. Sawano, R. Kobayashi, H. Yoshioka, and H. Shinno, “A Proposed Ultraprecision Machining Process Monitoring Method Using Causal Network Model of Air Spindle System,” Int. J. Automation Technol., Vol.5, No.3, pp. 362-368, 2011.
  3. [3] T. Shinshi, K. Sato, and A. Shimokohbe, “A Compact Aerostatic Spindle Integrated with an Axial Positioning Actuator for Micro and Ultra-Precision Machine Tools,” Int. J. Automation Technol., Vol.2, No.1, pp. 56-63, 2008.
  4. [4] N, Mishima, K. Mizuhara, and Y. Okazaki, “Thermal properties of a hydrostatic air spindle (1st Report): analysis and control of thermal deformations,” J. of the Japan Society for Precision Eng., Vol.59, No.3, pp. 497-502, 1993 (in Japanese).
  5. [5] D. Wu, B. Wang, X. Luo, and Z. Qiao, “Design and analysis of aerostatic spindle with high load characteristics for large ultra-precision drum lathe,” Proc. Inst. Mech. Eng. Part J. Eng. Tribol., Vol.229, No.12, pp. 1425-1434, 2015.
  6. [6] Y. Nakao, M. Mimura, and F. Kobayashi, “Water Energy Drive Spindle Supported by Water Hydrostatic Bearing for Ultra-Precision Machine Tool,” Proc. of ASPE 2003 Annual Meeting, pp. 199-202, 2003.
  7. [7] Y. Nakao, N. Asaoka, and M. Fujimoto, “Development of angular position-controllable fluid-driven spindle and its angular position control,” Trans. of the JSME, C, Vol.76, No.763, pp. 749-758, 2010 (in Japanese).
  8. [8] Y. Nakao, K. Suzuki, T. Sano, and M. Nagashima, “Development and speed control of water driven stage,” Trans. of the JSME, Vol.80, No.815, doi: 10.1299/transjsme.2014dsm0214, 2014 (in Japanese).
  9. [9] Y. Nakao, H. Niimiya, and T. Obayashi, “Rotary-type flow control valve for control of fluid-driven spindle,” Trans. of the JSME, C, Vol.77, No.774, pp. 514-526, 2011 (in Japanese).
  10. [10] A. Slocum, P. Scagnetti, N. Kane, and C. Brunner, “Design of Self-Compensated, Water-Hydrostatic Bearings,” Precision Eng., Vol.17, No.3, pp. 173-185, 1995.
  11. [11] S. Okuyama, A. Yui, M. Kumagai, and T. Kitajima, “Development of a Linear-Motor-Driven Table with Hydrostatic Water Bearing,” Trans. of the JSME, C, Vol.75, No.750, pp. 454-459, 2009 (in Japanese).
  12. [12] N. Kusui, S. Hayama, and M. Yoshikawa, “A Study on Linear Motion Stage Using Water-hydrostatic Bearing,” Trans. of JSPE, Vol.65, No.8, pp. 1153-1157, 1999 (in Japanese).
  13. [13] Y. Nishitani, S. Yoshimoto, and K. Somaya, “Numerical Investigation of Static and Dynamic Characteristics of Water Hydrostatic Porous Thrust Bearings,” Int. J. Automation Technol., Vol.5, No.6, pp. 773-779, 2011.
  14. [14] A. Yui, M. Kumagai, T. Kitajima, S. Okuyama, E. Fujita, and A. Slocum, “Development of a linear-motion-driven table with hydrostatic water bearings,” Trans. of the JSME, C, Vol.75, No.752, pp. 1128-1134, 2009 (in Japanese).
  15. [15] K. Suzuki, S. Akazawa, and Y. Nakao, “Development of Cam-Drive Type Proportional Valve for Water Hydraulics,” Int. J. Automation Technol., Vol.6, No.4, pp. 450-456, 2012.
  16. [16] Y. Nakao, K. Suzuki, K. Yamada, and K. Nagasaka, “Feasibility Study on Design of Spindle Supported by High-Stiffness Water Hydrostatic Thrust Bearing,” Int. J. Automation Technol., Vol.8, No.4, pp. 530-538, 2014.
  17. [17] R. Kirigaya, A. Hayashi, D. Fedorynenko, and Y. Nakao, “Measurement of dynamic characteristic of hydrostatic spindle against radially applied forces,” Proc. of 32nd ASPE Annual Meeting, pp. 585-588, 2017.
  18. [18] A. Hayashi and Y. Nakao, “Evaluation of thermal stability of water-driven spindle,” Trans. of the JSME, Vol.83, No.856, p. 17-00268, 2017 (in Japanese).
  19. [19] S. Morimura, “Development of New Spindle Cooling Technology that Concentrates Cooling Near Front Bearing,” Int. J. Automation Technol., Vol.9, No.6, pp. 698-706, 2015.
  20. [20] S. Yagyu, S. Shimizu, and N. Imai, “Mechanism of Thermal Deviation Characteristic in Spindle System of Machine Tools,” Int. J. Automation Technol., Vol.2, No.3, pp. 191-198, 2008.
  21. [21] T. Moriwaki, E. Shamoto, and T. Tokunaga, “Thermal deformation of an ultraprecision machine tool due to environmental temperature change (Analysis of thermal characteristics by transfer function and estimation of deformation by convolution integral),” Trans. of the JSME, C, Vol.63, No.615, pp. 4025-4030, 1997 (in Japanese).
  22. [22] H. Yoshioka, S. Matsumura, H. Hashizume, and H. Shinno, “Thermal deformation control of aerostatic spindle system using temperature controlled supply air,” Trans. of the JSME, C, Vol.70, No.700, pp. 3605-3610, 2004 (in Japanese).
  23. [23] Y. Tamura, H. Sawano, H. Yoshioka, and H. Shinno, “A thermally stable aerostatic spindle system equipped with self-cooling function,” J. of Advanced Mechanical Design Systems and Manufacturing, Vol.8, No.6, JAMDSM0079, doi: 10.1299/jamdsm.2014jamdsm0079, 2014.
  24. [24] H. Suzuki, K. Urano, H. Kumehara, and K. Kusumoto, “Minimizing thermal deformation of ultraprecision machine tool induced by lubricating oil of hydrostatic bearings,” J. of the Japan Society for Precision Engineering, Vol.75, No.9, pp. 1106-1111, 2009 (in Japanese).

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Last updated on Sep. 19, 2019