精密磨床液体静压轴承的多物理场耦合热分析

Coupled Thermal Analysis of Multi-physical Field of Hydrostatic Bearing in Precision Grinding Machine

为了提高精密磨床的加工精度,以机床主轴系统的液体静压轴承为研究对象。通过应用热流固耦合(Thermal Fluid Solid Interaction,TFSI)方法求解该耦合系统的连续性方程、能量方程和Navier-Stokes方程组,得到耦合系统的油膜压力场、油膜温度场、轴承温度场、轴承变形场等参数。结果表明,随着轴颈转速的增加,滑动轴承油膜压力和温度不断增加;随着供油压力的增加,油膜温度几乎没有变化。文章得出的仿真结果对液体静压轴承的结构设计和工艺参数优化有一定的参考意义,且采用有限元软件计算液体静压轴承耦合传热问题能更有效地反映真实的传热情况。

In order to improve the machining accuracy of precision grinding machine, the hydrostatic bearing of machine tool spindle system as the research object. Through the thermo-hydro-mechanical three field coupling method （TFSI）, the continuity equation, energy equation and Navier-Stokes equation of the coupled system can be solved, then parameters likes pressure field and temperature field of oil film, temperature field and deformation field of bearing and so on are obtained. The analysis results show that the oil film pressure and temperature of the sliding bearing are increasing with the increase of the shaft speed; With the increase of oil supply pressure, there are little changes of oil film temperature; The simulation results of this paper have some reference value for the structural design and process parameters optimization of the hydrostatic bearing, and the coupled heat transfer problem of liquid static pressure bearing is more effective to reflect the real heat transfer conditions by using the finite element software.