The Development Of A Dual-oil-Film Rotor System Of Lapping Machine And Its Characteristic Research

The dual-plate lapping machine is the important equipment for mass producing of high precision balls. The bearing of dual rotors plate act as whirling support member, which has important influence on the machining precision of the dual-plate lapping machine. The existing dual-plate lapping machine uses rolling bearing, so it has following inherent shortcomings, the big friction and wear, the limited precision life, discrete life distribution, and poor vibration damping. The hydrostatic bearing has the high precision, long life, excellent performance and good vibration damping, so it is the ideal program for replacing rolling bearings. But the overall structure and layout of the dual-plate lapping machine is very difficult, the double oil supply is difficult to achieve, the oil seal is difficult, and the optimization of the double film performance and load characteristics of the flow field's bearing are difficult and existing other technical problems, so it is urgent to further study.According to the unique structure of double rotation grinding plate in the ball grinding machine, developed a double oil film external static pressure bearing rotor system. Which the outer spindle is a hollow structure, and the inner spindle is located in the outer spindle; the outer bearing is located in the box, and the inner bearing is located in the outer spindle. Because of the problem of oil supply within the spindle bearing in synchronization, the new method is applied which opening oil groove in outer spindle face for the inner bearing. According to the ball grinding machine with double rotor vertical structure, the high pressure gas is used for sealing oil leakage, which making up for the traditional mechanical seal to realize the effective way of seal weakness.The hydrodynamic lubrication model of hydrostatic bearings based on finite volume method and computational fluid dynamics is established. And the discrete method, discrete scheme, and solution of algebraic equations of basic equations in fluid dynamics are discussed, aiming at the classical hydrodynamic lubrication problems, the comparative study on the three-dimensional numerical simulation based on CFD and one-dimensional and two-dimensional theoretical calculation based on Reynolds assumptions is carried out. In order to ensure the bearing performance meet the design requirements, the performance of dual-oil-film bearings is analyzed. The radial bearing system model and the thrust bearing system model are built. The built models are used to study the flow field distribution and the static characteristics of bearings.Comparing the existing literature of engineering calculation method and the dynamic characteristics numerical research of a Dual-Oil-Film static pressure Rotor that were proposed by this topic. Research shows that, according to the result of numerical simulation method of this topic ,it can reflect the engineering features of Dual-Oil-Film static pressure Rotor, also can be used as a basic method of dynamic characteristics analysis and optimizationa of Dual-Oil-Film static pressure Rotor system。The work offers important reference and effective approaches for the structure design and dynamic performance of hydrostatic spindle for the rotated dual-plates lapping machine.