Structure Optimization And Simulation On Oil Cavity Of Center Rest Of Heavy-duty Horizontal Boring Lathe

Heavy hydrostatic center rest with advantages of large carrying capacity,stable and reliable operation, small friction, high stiffness has been widelyapplied to heavy equipment. Whose performances have a direct impact on theprocessing accuracy and processing efficiency of the entire device. The filmlubrication characteristics of hydrostatic center rest directly affect the work ofturning performance, reliability and longevity, therefore the lubricationcharacteristics and properties of the hydrostatic center rest was researched basedon the theoretical analysis and numerical simulation in this paper. By numericalsimulation of velocity field, pressure field and temperature field of heavyhydrostatic thrust bearing clearance fluid to optimize the oil cavity shape anddepth, proposing a new design criterion for the bearing oil cavity structure,thereby enhancing rotation accuracy, operation efficiency of heavy hydrostaticthrust bearing.Based on the computational fluid dynamics theory, lubrication theory andhydrostatic technology, through making a summary of radial bearings in Chinaand abroad, the lubrication mechanism and static pressure supportingprinciple ofhydrostatic center rest are researched. The research program of hydrostatic centerrest is made in detail.The structure design of middle pillow of hydrostatic center rest is studieddetailedly, which including selecting the shape and number of the oil cavity, thearrangement of oil cavity and oil pipe in middle pillow of hydrostatic center rest.The basic assumptions and governing equations of CFX finite element analysissoftware are given. The three-dimensional model of middle pillow is established.The interstitial oil film of the hydrostatic center rack is meshed using ICEM CFD software. Based on numerical simulation method of the finite volumecomputational fluid dynamics, a suitable computer simulation model andboundary conditions was selected. Velocity field, pressure field and temperaturefield of clearance fluid of hydrostatic thrust bearing with different cavity shapes,different cavity depth and different rotation speed are obtained.The curve of relationship between the highest temperature and speed ofworkbench was drawn, obtain the result of effect of the inlet location in oil filmbearing performance and compare the load capacity under different shaped cavity.Through the analysis and research above, the static performancecharacteristic of hydrostatic center rest was studied in this paper. The results canprovide the theory basis for the lubrication and the support and optimizationdesign of hydrostatic center rack.