Study On Oil Film Stiffness Performance Of High Speed And Heavy Load Hydrodynamic And Hydrostatic Mixed Lubrication Thrust Bearing

Hydrostatic thrust bearing is the core component of heavy-duty machinery because of its high running accuracy,good stability,low power consumption,vibration absorbing and long working life.With the development of modern industry,the demand for rotation speed and carrying capacity of numerical control equipment becomes higher and higher.Under the extreme condition of overloading,micro gap and high velocity,shear heat rises,lube viscosity decreases,oil film thickness becomes thin and unequally distributed,oil film stiffness decreases,local boundary lubrication and dry friction appear,which further causes the tribological failure and severe static pressure loss.Therefore,proposed to adjust structure of Hydrodynamic oil pad,make it angle process of machining.It becomes hydrodynamic and hydrostatic mixed lubrication thrust bearing in condition of dynamic pressure formation,and raise lubrication performance and oli film stiffness.solve the problems that machining precision and stability in condition of high speed and heavy loads.By the theoretically deduction equation that bearing capacity,flat flow,oil film thickness and oil film stiffness of the hydrodynamic hydrostatic thrust bearing.With the three-dimensional software UG,the oil film model of oil pad with double rectangular cavities is defined,mesh is divided and oil film boundary conditions are set respectively in the ANSYS ICEM CFD and ANSYS CFX,under the same speed and load condition,the pressure field and temperature field of the hydrodynamic and hydrostatic oil pad with different angles are simulated.the influence of lubrication performance and oil film stiffness is concluded angles are obtained by analyzing data.The simulation of oil cavity area tilting oil pad,calculation of pressure nephogram and temperature nephogram of oil film under different oil cavity area.The influence of lubrication performance and oil film stiffness is concluded oil cavity area are obtained by analyzing data.Study on the fitting of dip angle and oil cavity area.In order to find out a most reasonable way of matching to ensure stable operation of hydrodynamic and hydrostatic lubrication thrust bearing.In order to verify the correctness of the theoretical calculation and simulation analysis,the experimental verification is conducted on the vertical CNC lathe in the Qiqihar heavy CNC equipment Company Limtied.Use sensor to collect data such as oil film pressure,oil film temperature and oil film thickneess in different speed,working condition of 12 t.Compare the results of the experiment with the results of the numerical analysis to Verify the correctness of experimental results and numerical analysis.Finally,the more reasonable oil cushion structure is designed through theoretical calculation,simulation and experiment.