Cavity Design And Simulation Of Heavy Hydrostatic Thrust Bearing

Heavy hydrostatic thrust bearing with advantages of large carrying capacity, stable and reliable operation, small friction, high stiffness has been widely applied to heavy equipment and becomes a core component, whose performances have a direct impact on the processing accuracy and processing efficiency of the entire device. With the continuous further study, scholars have found that the lubrication problem seriously affects service life and reliability of heavy hydrostatic thrust bearing. According to the problem that lubrication failure problems are mainly caused by lubricant film fracture of heavy hydrostatic thrust bearing under high speed and heavy load, by numerical simulation of velocity field, pressure field and temperature field of heavy hydrostatic thrust bearing clearance fluid to optimize the oil cavity shape and depth, proposing a new design criteria for the bearing oil cavity structure, thereby enhancing rotation accuracy, operation efficiency and service life of heavy hydrostatic thrust bearing.Hydrostatic thrust bearing that is widely used in heavy vertical CNC lathes is studied. Based on computational fluid dynamics, lubrication theory and hydrostatic technology, establishing the governing equations of hydrostatic thrust bearing clearance fluid, adopting finite volume method, using FLUENT software, selecting the segregated solver, choosing laminar flow model, defining lubricant properties, setting boundary conditions such as the constant current import, pressure export and wall, setting convergence criterion, velocity field, pressure field and temperature field of clearance fluid of hydrostatic thrust bearing with different cavity shapes, different cavity depth and different rotation speed are obtained. The following conclusions can be obtained by numerical calculation. The oil cavity shape has a great influence on the velocity field, pressure field and temperature field. The uniformity of velocity distribution from good to bad is in order of sector cavity, ellipse cavity, rectangular cavity and I-shaped cavity. Dynamic pressure from big to small is in order of rectangular cavity, I-shaped cavity, sector cavity and ellipse cavity. Temperature rise from high to low is in order of I-shaped cavity, ellipse cavity, sector cavity and rectangular cavity. The oil cavity depth has a great influence on the velocity field, pressure field. With the deepening of oil cavity depth, the velocity distribution becomes more and more uneven and dynamic pressure effects become smaller and smaller. And the oil cavity depth has a little influence on the temperature field. The temperature rise keeps invariant with the deepening of oil cavity depth. Rotation speed has a great influence on both dynamic pressure and temperature who increase with the rotation speed increasing.Through analyzing the numerical calculation results, laws are revealed that influence of the shape of oil cavity, oil cavity depth and rotation speed on velocity field, pressure field and temperature field. optimizing the oil cavity structure of heavy hydrostatic thrust bearing, and effectively improving the lubricity, service life and operation efficiency of the bearing, that have an important directive significance for design, simulation analysis and study on properties of hydrostatic thrust bearing in engineering practice.