Research On Load Characteristics Of Gas Film Flow Field Of Hybrid Bearings With Herringbone Groove And Micro-orifice In High Pressure

As an important branch of gas bearings,dynamic and static pressure gas bearings have outstanding characteristics such as low friction,high speed,low heat generation,and high precision.In recent years,they have been widely used in precision and ultra-precision machine tools and important support components in ultra-high-speed sports equipment.This paper proposes a micro-groove joint flow static pressure gas bearing,which integrates the main characteristics of static pressure gas bearing and dynamic pressure gas bearing,and combines the throttling effect of the classic small hole throttling method and the dynamic pressure effect produced by the herringbone groove.Combined with each other to form a new type of high-performance dynamic and static pressure bearings.This research has important theoretical and practical significance for the application of gas bearing technology in high-end CNC equipment to form high-performance dynamic and static pressure gas bearing spindle system functional components.Analyze the working principle of the micro-slot flow hydrostatic gas bearing,and design and study the main structure of the proposed micro-slot flow hydrostatic gas bearing,including restrictor structure design,dynamic pressure groove structure design,based on the gas bearing Lubrication theory,deriving the Reynolds equation of dynamic and static pressure gas bearings,provides a basic theory for the follow-up research of micro-slot flow static pressure gas bearings.Using Solidworks to carry out three-dimensional modeling of dynamic and static pressure gas bearings,and analysis of related structural parameters,using Gambit software to model and mesh the gas film of micro-slot flow static pressure gas bearings,and dynamic and static pressure gas bearing structures Discretization to obtain the finite element analysis calculation model of the gas film flow field of the bearing,to establish a theoretical model of the bearing capacity of the dynamic and static pressure gas bearing,respectively,the throttling effect and static pressure of the small hole throttling on the static pressure bearing capacity of the dynamic and static pressure gas bearing The finite element theoretical analysis of the bearing capacity and the theoretical analysis of the dynamic pressure bearing capacity of the herringbone dynamic and static pressure gas bearings provide the theoretical basis and analysis model for the research of the bearing characteristics and gas film flow field characteristics of the micro-slot flow hydrostatic gas bearing.Fluent software was used to analyze the flow field characteristics,dynamic pressure effect,and bearing capacity of the micro-slot flow hydrostatic gas bearing,to obtain the gas supply pressure,rotation speed,and gas film thickness.The law of pressure effect,flow field characteristics and bearing characteristics.According to the analysis of simulation results,determine the reasonable parameter values of gas supply pressure,gas film thickness and rotation speed,analyze the hydrostatic gas bearing characteristics and the main parameters of the herringbone groove of the hydrostatic gas bearing of the micro-groove orifice(the groove width ratio of the herringbone groove,the groove length ratio of the herringbone groove,the groove depth ratio of the herringbone groove and the number of herringbone grooves).The static film gas field of micro-slotted joints with different structural parameters was simulated to obtain the influence of the relevant parameters of the herringbone groove on the bearing performance.It provides a reference for designing and researching high-speed,high-load-capacity micro-slot flow static pressure gas bearings.