Design And Characteristics Analysis Of The Hydrostatic Spindle For Precision Grindeing Machines

Numerical method is used to calculate the oil film performance of hydrostatic spindle thrust surface and radial surface under steady state,and on this basis,the interaction between the thermal characteristics model and the structural parameters and working con-In this paper,several engineering and scientific problems in the design of hydrostatic spindles for the ultra-precision grinding machine are studied deeply.Due to the small oil film thickness of the hydrostatic spindle and the serious heating of the bearing under high speed and heavy load conditions,its application in high speed and high precision is restricted.In response to this critical issue,this paper firstly studied the flow characteristics and temperature rise characteristics of high-speed hydrostatic bearings,proposed a correction equation for the oil film thermal characteristics of the hydrostatic spindle,and optimized the thermal characteristics parameters.Based on the modified boundary conditions of viscosity-temperature characteristics and elastic boundary conditions,the extrusion effect of the oil film force and the cavitation effect of the surface texture structure were also considered.The performance of the oil film in a stable state is analyzed.The correctness and effectiveness of the mathematical model are verified by the comparison between simulation and experiment,which provides a theoretical basis for the parameter design andThe continuous improvement of material life and spiritual life of human society has become more and more stringent for new products and existing products.To meet the requirements of product accuracy and performance improvement,the requirements for the precision and stability of precision machine tools are increasingly required high.The main shaft of hydrostatic pressure is the core component of the precision processing equipment.It has the advantages of large loading capacity,high rotation accuracy,stable exercise,small wear,and good shock resistance.The main shaft and guide rail system of hydrostatic pressure lubrication play a pivotal role in the fields of aerospace,automobile manufacturing,household appliances,tank processing,and even micro-electronic device manufacturing.Therefore,the systemic research on the systemic research on the spindle of high-precision hydrostatic pressure has important engineering and scientific significance.performance analysis of a high-precision hydrostatic spindle.ditions were analyzed.At the same time,the influence of throttling hole configuration on the oil film pressure and temperature fluctuation was studied,and the structural parameters of the spindle,working conditions,and the structural form of the oil inlet position were optimized.The dynamic characteristics of the hydrostatic bearing are analyzed by using the thermo-elastic model.The transient simulation model of the oil film flow field of hydrostatic bearing based on the dynamic grid method was established,and the influence law of oil film of thrust surface and radial surface on axial displacement,dynamic stiffness,and dynamic damping of hydrostatic bearing was further analyzed.The structure size was optimized,and the motion law of hydrostatic bearing was explored according to the influence of dynamic and static characteristics analysis on the grinding spindle.A more efficient analysis method was proposed for the calculation of static characteristics and rotation accuracy in the design of the hydrostatic bearing.The possibility and implementation method of using the cavitation effect to increase the maximum allowable speed of the spindle in the design of the high-speed hydrostatic spindle were explorably studied,and the cavitation model based on the viscosity correction coefficient was deduced.The formation and rupture mechanism of the cavitation phenomenon on the oil film surface are revealed,the characteristics of the adsorption and separation of bubbles on the textured surface are discussed,and some basic work is done for the application of the cavitation effect to reduce drag on the bearing surface.The characteristics of different oil film designs were verified,and the effects of four different configurations of surface textures on the oil film pressure and temperature were systematically studied in the effective bearing area of the thrust surface oil film.Finally,according to the requirements of the cooperative manufacturers for the existing parameters and design indicators of the precision grinder,a prototype of the experimental principle of the dynamic and static characteristics of the hydrostatic spindle was built.Spindle temperature and oil film pressure under hydrostatic pressure,and static stiffness at steady state.The dynamic characteristics and rotation accuracy of the hydrostatic spindle are experimentally studied by using the spindle vibration analyzer and the rotation accuracy analyzer.Experiments show that the design and analysis method used in this paper can effectively reduce the internal temperature of the spindle,which has good engineering practicability and theoretical reference value.