重型卧式车床主轴系统热特性分析

主轴系统的热特性对重型卧式车床的加工精度有重要的影响。以某型号重型卧式车床的主轴系统为主要研究对象，采用有限元热-固耦合方法，仿真计算了主轴系统达到热平衡状态后的温度场分布和热变形特性，分析了热变形导致主轴中心线偏移情况。结合主轴系统静压轴承的结构特点，分析了轴承转速、液压油粘度、油膜间隙和供油压力对主轴系统变形场的影响。结果表明，这些因素对主轴系统的变形场有不同程度的影响，为主轴系统优化设计和热误差补偿提供了理论依据。

Thermal Characteristics Analysis of the Spindle System of Heavy Duty Horizontal Lathe

The thermal characteristics of the spindle system has a significant influence on the machining accuracy of the heavy horizontal lathe. The major research object is the spindle system of heavy horizontal lathe. Based on the thermoset coupling analysis of the finite element method, the temperature field and thermal deformation field of the spindle system after reaching the thermal equilibrium state is simulated. And the shift of the spindle's center line that thermal deformation has led is analyzed. According to the structural characteristics of the hydrostatic bearing, the effect of the rotational speed of bearing, viscosity of hydraulic oil, the thickness of the hydrostatic oil film and the oil supply pressure to the thermal deformation of the spindle system are analyzed. The results show that all the factors have different-level influences on the deformation field of the spindle system, and therefore provide a reference for the optimal design and thermal error compensation of the spindle system.