动静压轴承热流固耦合分析及实验研究
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摘要
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,taking 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 dissipation 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.
In order to determine the influence of the thermal deformation of the bearing on the machining precision,taking 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 dissipation 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.
引文
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[3]WANG X Z,YU T B,SONG Y H,et al.Thermal characteristics analysis of liquid hybrid bearing on ultra-high speed grinding[J].Advanced MaterialsResearch,2012,565:171-176.
[4]KUZNETSOV E,GLAVATSKIH S.Dynamic characteristics o compliant journal bearings considering thermal effects[J].Tribology International,2015,94:288-305.
[5]石莹,王学智,刘金营,等.基于Fluent-BP神经网络的液体动静压轴承热特性分析[J].润滑与密封,2016,41(1):37-42.SHI Y,WANG X Z,LIU J Y,et al.Thermal characteristics analysis of liquid hybrid bearing based on fluent-BP neural networks[J].Lubrication Engineering,2016,41(1):37-42.
[6]郭力,曹姗,胡靖.高效精密动静压主轴热动力学耦合特性分析[J].机械科学与技术,2015,34(11):1686-1692.GUO L,CAO S,HU J.Coupling analysis of thermal-dynamics characteristics of high efficiency and precision hybrid spindle[J].Mechanical Science and Technology for Aerospace Engineering,2015,34(11):1686-1692.
[7]姜继海.液体变粘度缝隙流动理论与解析[M].北京:国防工业出版社,2005.
[8]孟晶,戴惠良,方波,等.基于FLUENT的液体动静压轴承油膜特性的分析[J].液压与气动,2012(8):17-21.MENG J,DAI H L,FANG B,et al.Analysison oil film properties of hybrid bearing based on FLUENT[J].Chinese Hydraulics&Pneumatics,2012(8):17-21.
[9]朱红钧.ANSYS14.5热流固耦合实战指南[M].北京:人民邮电出版社,2014.
[10]何燕,张晓光,孟祥文.传热学[M].北京:化学工业出版社,2015.