Experimental and Model Inverse Study of Oil Film Temperature Rise of Hydrostatic Bearing Considering Solid-liquid Friction

doi:10.3901/JME.2025.05.062

Abstract

Abstract: The oil film temperature rise of hydrostatic bearings is one of the key factors limiting the increasing of spindle speed, while the existing bearing oil film temperature rise model does not take into account the heat generated by solid-liquid friction, in the long-term study of hydrostatic spindles and tracking its practical application, a significant gap between the value of the oil film temperature rise calculated according to the existing model and the test results is found. Aiming at the above problems, a principle test bench of liquid film shear characteristics of hydrostatic bearings was constructed, and the bearing oil film temperature rise and flow rate values are measured under the conditions of different spindle rotational speed, different supply pressure and different oil film thicknesse. The measured and calculated values of the bearing oil film temperature rise are compared and analyzed. It is found out that the oil film temperature rise calculated according to the existing hydrostatic bearing oil film temperature rise model is much smaller than the experimental test value, and the error was mainly related to the oil film temperature rise caused by friction power consumption. Based on the experimental test results, the influence law of different working conditions on the solid-liquid friction characteristics is investigated by inverse solution. The temperature rise of the bearing oil film caused by solid-liquid friction increases linearly with respect to the increase in spindle speed and decreases linearly with respect to the increase in oil film thickness. The solid-liquid friction shear stress increases gradually with respect to the spindle speed and then converges to a certain value, and increases linearly with respect to the oil supply pressure. A new model of oil film temperature rise of hydrostatic bearing considering solid-liquid friction is established, and it is verified by comparing with the experimental results that the new model can greatly improve the accuracy of theoretical calculation. Within the scope of this study, it is possible to reduce the theoretical calculation error from about 90% to 4%-14%.

Key words: oil film temperature rise, solid-liquid friction, hydrostatic bearings

CLC Number:

XIONG Wanli, YUAN Shuai, ZHANG Hanqian, JIN Zhixin, FANG Zerong. Experimental and Model Inverse Study of Oil Film Temperature Rise of Hydrostatic Bearing Considering Solid-liquid Friction[J]. Journal of Mechanical Engineering, 2025, 61(5): 62-73.

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