DEFORMATION OF FRICTION PAIRS OF STATIC AND DYNAMIC PRESSURE HYBRID BEARING WITH TILTING OIL PAD

During the operation of the hydrostatic bearing under high-speed and heavy-load conditions, due to the combined effects of strong extrusion and high-speed shear, the temperature and pressure distribution of micro-gap oil film are not uniform, resulting in fluid-heat-solid coupling deformation of the hydrostatic bearing friction pairs. In order to solve this problem, a new type of hydrostatic bearing structure with tilting oil pad is proposed, which can realize micro-swing in any direction during operation, generate additional dynamic pressure and form a static and dynamic hybrid bearing to achieve high-speed and heavy-load working conditions. Based on the fluid-thermo-solid coupling theory, ANSYS Workbench is used to analyze the deformation of the hydrostatic bearing friction pairs, and the fluid-thermo-solid coupling deformation law of the rotational worktable, tilting oil pad and base under the extreme operating conditions of 0 t~32 t is discussed. The deformation data is extracted and then the deformation relationship of the friction pair is obtained by using MATLAB program. It is found that the deformation at the corner of the outer sealing oil side of the oil cavity is the largest, where the gap oil film is the thinnest and the tribological failure is most likely to occur, and the results provide a new method for further control of friction pairs deformation and tribological failure mechanism.