Research On Static And Dynamic Characteristics Of New Type Oil Cushion Tilting Hydrostatic Thrust Bearing

Hydrostatic thrust bearing is an indispensable important component in heavy-duty CNC machining.The performance of this part has a direct impact on the operating efficiency,stability and manufacturing quality of the overall equipment,and the accuracy and The bearing capacity requirements are gradually increasing.In the past research on hydrostatic thrust bearings,more attention was paid to a series of characteristics of the bearings under normal working conditions.However,in actual working conditions,the processing environment and requirements are not fixed and the processing state There are usually extreme conditions.When the hydrostatic thrust bearing is working under extreme conditions,the oil film is subjected to shearing and squeezing.The oil temperature will rise and the oil film will become thinner,which increases the probability of tribological failure.The new oil-cushion tiltable hydrostatic thrust bearing is a support structure that can compensate for the static pressure loss to a large extent through dynamic pressure during the working process,and effectively play a role through static and dynamic compensation.And this effectively suppresses the occurrence of friction failure,and provides a great guarantee for the hydrostatic thrust bearing to achieve high-precision work under extreme conditions.Therefore,it is very important to study the static and dynamic characteristics of this kind of bearing under extreme conditions.According to the theoretical data of the hydrostatic thrust bearing,the equations required before the simulation of the new oil cushion tilting hydrostatic thrust bearing are deduced and calculated,including the basic control equation of the gap oil film of the new oil cushion tilting hydrostatic thrust bearing and the new oil The lubrication performance control equation of the gap oil film of the pad tilting hydrostatic thrust bearing.Use modeling software Solid Works to create the overall model of the new oil cushion tiltable hydrostatic thrust bearing,extract the oil film model with the best comprehensive inclination angle,mesh the model,set boundary con ditions,and calculate and solve the oil film model,And finally obtained the oil film pressure field and temperature field of the new oil cushion tiltable hydrostatic thrust bearing.Analyze and compare the temperature field and pressure field with the temperature and pressure field of hydrostatic thrust bearing when the oil cushion is not tiltable.The oil film damping coefficient equation of the new oil-cushion tiltable hydrostatic thrust bearing under sudden load is deduced and calculated.The gap oil film mathematical model and the gap oil film system transfer function of this type of bearing are created,and the MATLAB software is used in the step Under load,the stability of the gap oil film system of the new oil cushion tilting hydrostatic thrust bearing is analyzed under different oil cavity sizes,different fluid viscosities,and different extreme loads(the oil cushion has the best comprehensive inclination angle).The dynamic stiffness of the oil film and the relationship between static stiffness and dynamic stiffness of the new oil-cushion tilting hydrostatic thrust bearing are compared and analyzed under sinusoidal load.This paper takes the new oil cushion tilting hydrostatic thrust bearing as the research object.Experiments are carried out in Qiqihar Heavy CNC Equipment Corp.ltd.Different numbers of pressure and temperature measuring points are set in the oil cavity of the new oil cushion.The pressure data was collected,and the experimental data and the simulation data were used for compara tive analysis.Finally,the consistency of the simulation and the experimental data was confirmed,and the correctness of the data simulation.