动静压轴承热流固耦合分析及实验研究

Thermo-Fluid-Solid Coupling Analysis and Experimental Study on Hybrid Bearing

为了确定轴承的热变形对机床加工精度的影响,以磨床砂轮电主轴系统的动静压轴承为研究对象,采用FLUENT15.0分析轴承油膜温度场随主轴转数、供油压力的变化规律,应用Workbench建立轴承-油膜热流固耦合模型进行热变形分析,使用红外测温仪测得不同转数下轴承实际温升。结果表明:主轴转数对油膜温升影响较大,而供油压力的影响较小,适当增大供油压力有利于降低轴承油膜的温升;轴承最大热变形量位于轴承两端边缘的偏心位置处,在轴承设计时需对偏心位置采取必要的散热措施;实验结果与理论结果趋于一致,验证了理论分析方法的正确性。

In order to determine the influence of the thermal deformation of the bearing on the machining precision, tak- ing the grinding wheel spindle bearing system as the research object, the change of the oil film temperature field of bearing with the spindle speed and oil pressure was analyzed by FLUENT15.0,and the Thermo-Fluid-Solid coupling model of the bearing and oil film was established by Workbench to analyze the thermal deformation of bearing.The actual temperature rise of bearing under different speed was measured by using infrared thermometer.The results prove that the spindle speed has great influence on the oil film temperature, while the oil supply pressure has less influence, and increasing the supply pressure properly is beneficial to decrease the temperature rise of the bearing oil film.The maximum thermal deformation of the bearing is located in the eccentric position at both edge of the bearing, and in the design of bearings, the heat dissipa- tion measures should be taken to the eccentric position.The experimental results are consistent with the theoretical results, which verifies the correctness of the theoretical method.