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Inclination angle effect of tribological performance for hydrostatic bearing having tilting oil pad under variable viscosity conditions

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Abstract

In order to improve tribological performance of hydrostatic bearing, an innovative hydrostatic bearing structure having tilting oil pad is designed. During the operation, the semicircular boss at the bottom of the oil pad can realize the circumferential micro-motion. It generates additional dynamic pressure, and forms the static and dynamic pressure mixing support, make up for the static pressure loss, and solves the problems such as low precision and unstable operation of the numerical control equipment under the high speed and heavy load conditions. According to the tribological principle and lubrication theory, bearing capacity, flow rate, oil film thickness equation and oil film stiffness for hydrostatic and dynamic hybrid bearing are derived under variable viscosity conditions. The simulation model of hydrostatic bearing having tilting oil pad is established. ANSYS software is used to analyze the distribution of oil film temperature field and oil film pressure field under different inclination angles. The effects of tilting oil pad inclination angle on oil film tribological performance and oil film stiffness are obtained. The results show that the hydrostatic bearing having tilting oil pad can generate additional dynamic pressure in high speed operation, make up the loss of static pressure. When the inclination angle is 0.0044°, oil film temperature rise is 34.8 ℃, the average pressure is 622.2 KPa, oil film stiffness is 54104 N/µm, the comprehensive lubrication performance is optimal, the oil film stiffness is the largest, and the operation accuracy and stability of hydrostatic bearing are improved.

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Acknowledgment

This research was financially supported by the National Natural Science Foundation of China (51375123) and the Natural Science Foundation of Heilongjiang Province (E2016040).

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Authors and Affiliations

  1. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Heilongjiang Province, Harbin, 150080, China

    Xiaodong Yu, Guangpeng Wu, Wenkai Zhou, Hongwei Bi, Yu Wang & Weicheng Gao

  2. Qiqihar Heavy CNC Equipment Corp. LTD, Qiqihar, 161005, China

    Junfeng Wang, Jianhua Jiao & Hui Jiang

Authors
  1. Xiaodong Yu
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  2. Guangpeng Wu
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  3. Wenkai Zhou
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  4. Hongwei Bi
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  5. Yu Wang
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  6. Weicheng Gao
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  7. Junfeng Wang
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  8. Jianhua Jiao
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  9. Hui Jiang
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Correspondence to Xiaodong Yu.

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Yu, X., Wu, G., Zhou, W. et al. Inclination angle effect of tribological performance for hydrostatic bearing having tilting oil pad under variable viscosity conditions. J Braz. Soc. Mech. Sci. Eng. 43, 231 (2021). https://doi.org/10.1007/s40430-021-02946-1

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  • DOI: https://doi.org/10.1007/s40430-021-02946-1

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