Research On Lubrication Characteristics Of Hydrostatic Bearing Based On Dynamic Mesh Technology

Hydrostatic thrust bearing with multi-oil-pads is the key part of heavy numerical control equipment.Local deformation occurs in hydrostatic bearing and film thickness becomes thinner because of bearing and temperature rise,that will directly influence machining accuracy and work efficiency of a whole machine.In order to solve the problems during hydrostatic bearing operation,a new calculation method of dynamic performance of hydrostatic bearing using dynamic mesh technique was proposed and a thorough study on lubricant performance characteristic was made.Firstly,lubrication mathematical model of the hydrostatic bearing system,which is suitable for dynamic performance calculation of hydrostatic bearing with multi-oil-pads was established.Dynamic mesh technology of hydrostatic bearing was studied and reasonable boundary condition was determined.Subsequently,dynamic model of oil film model was established,numerical simulation on multi-physics field of hydrostatic bearing through finite volume method was done.Key factors influence lubricant performance characteristic and the influence law is searched by simulations.Based on dynamic mesh method,dynamic performance prediction of hydrostatic bearing from the initial to variations of steady state was finally realized.Finally,in order to verify the validity of theoretical analysis and numerical simulation,steady verification test and a comparative analysis of experiment,theoretical and simulation was done.This study provided theoretical basis for the structure design of hydrostatic bearing and operation reliability,lay a theoretical and technology foundation for high efficiency and machining accuracy in the whole machine tool industry.