Thermal-fluid-solid coupling deformation of hydrostatic thrust bearing friction pairs

Yang

et al. 2023

ILT

Purpose The purpose of this paper is to analyze the variation of temperature field, pressure field and deformation of hydrostatic thrust bearing under different working conditions, so as to provide a theoretical basis for improving accuracy and reliability. Design/methodology/approach In this study, the double rectangular hydrostatic bearing of type Q1-224 was selected as the research object, and the simulation was carried out according to different working conditions, and the obtained data were summarized regularly. Findings It is found that the overall temperature of hydrostatic bearing increases with the increase of speed and load, and the increase in load will result in a larger pressure distribution which first increases and then decreases with the speed. The deformation trend of the deformation field is found, and it is found that the force deformation is larger than the thermal deformation at low rotational speed, and the thermal deformation is larger than the force deformation at high rotational speed. Originality/value In this study, the fluid-structure coupling method of conjugate heat transfer is applied to study the whole hydrostatic bearing. Most of the previous studies only studied the oil film and considered the influence of the convective heat transfer between the hydrostatic bearing and the air in heat transfer, which is rarely seen in the previous research literature.

Section: Introductionmentioning

confidence: 99%

Lubrication characteristics and thermal deformation of hydrostatic thrust bearing based on conjugate heat transfer

Yang

et al. 2023

ILT

Proceedings of the Institution of Mechanical Engineers, Part J:

“…Liu et al 15 deduced the temperature rise of lubricating water by comprehensively considering the influence of the centrifugal effect, shear effect, and pressure flow. Yu et al 16 studied the coupled thermomechanical deformation and friction failure mechanism of the bearings friction pair under extreme working conditions, revealed the distribution method of the coupled thermomechanical deformation, and got the relationship between the distribution law of friction pair deformation and parameters such as rotation rate. Wu et al 17 established a bearings finite element analysis model based on the thermodynamic coupling principle, considering the coupling effect of the stress field and the temperature field, and carried out a simulation analysis of the bearings.…”

Section: Introductionmentioning

confidence: 99%

Research on influencing factors of deformation of hydrostatic thrust bearings

Yu,

Liu,

Zhao

et al. 2023

Self Cite

When the hydrostatic thrust bearings operate under conditions of high speed and heavy load, the oil film will be strongly sheared and squeezed, which will increase the temperature of the hydrostatic oil film, resulting in uneven deformation of the workbench and tribology in serious cases. The deformation of the friction pair greatly affects the stability of the workbench during operation, and then affects the machining accuracy. Taking the hydrostatic thrust bearings as the research object, the model of hydrostatic thrust bearings was established based on the fluid–thermosolid coupling theory, and the influencing factors of the deformation of the hydrostatic thrust bearings are analyzed using ANSYS Workbench software, and the influencing laws are discussed. Finally, the correctness of the simulation method is verified by experiments. The results show that the larger the lubricating oil viscosity, the greater the deformation of the guide surface and the oil pad. With the increase in the rotation rate, the deformation of the guide surface and the oil pad increases continuously. With the increase in the inlet flow rate, the deformation of the guide surface and the oil pad is continuously reduced. In engineering practice, on the premise of ensuring the bearings capacity, low-viscosity lubricating oil should be used as much as possible, the rotation rate should be lower, or the inlet flow rate should be increased.

“…Lu et al [4] performed a one-way fluid-solid coupling analysis on a hydrostatic piezoelectric spindle, and the influence of the structure deformation on the static performance of the hydrostatic piezoelectric spindle is studied. Yu Mubing et al [5] studied the thermo-fluid-solid coupling deformation and friction failure mechanisms of bearing friction pairs under highspeed and heavy-load conditions. The results show that the temperature of the oil film rised sharply, the viscosity of the lubricating oil decreased rapidly, and the deformation increased.…”

Section: Introductionmentioning

confidence: 99%

Flow-Heat-Solid Coupling Thermal Deformation Analysis of Hydrostatic Spindle under Viscosity Temperature Effect

Chen

Zhang

2021

Preprint

The hydrostatic bearing oil film plays a key role in supporting and lubricating. As the speed increases, the temperature of the lubricating oil increases and the viscosity decreases. As a result, the bearing capacity of the oil film is reduced, which affects the motion accuracy of the hydrostatic bearing. In this paper, the simulation and analysis of the temperature rise of the hydrostatic bearing oil film under the constant viscosity and the viscosity-temperature effect are performed respectively. Then, based on the fluid-heat-solid coupling analysis theory, the temperature field of the hydrostatic bearing and the thermal deformation of the spindle shaft with and without the viscosity-temperature effect are analyzed separately. The temperature field of the shaft and the thermal deformation of the spindle shaft are analyzed separately. Finally, the bearing temperature and shaft deformation are compared with the experimental values for error analysis. It is found that the error rate is smaller when the viscosity-temperature effect is considered. Considering the viscosity-temperature effect, the maximum error rates of the temperature of the radial and thrust bearing bushes are 11.05% and 7.82%, and the maximum error rates of the thermal deformation of the spindle shaft in the axial and radial directions are 12.03% and 18.57%.