摘要
为了精确表征电主轴运转过程中的热态特性,综合考虑热诱导预紧力与黏温效应的影响,建立了新的轴承生热动态模型,在热边界条件引入接触热阻的基础上,采用有限元方法得到主轴系统稳态温度场分布,并分析了主要因素对电主轴热态特性的影响。计算结果表明:接触热阻的存在使主轴系统整体温度梯度增加,比没有考虑接触热阻时的温升高;温升引起的热变形,不仅生成了热诱导预紧力而且增加了轴承的温升;为了降低轴承产热,低转速下应选用高粘度润滑油,低转速下应选用高粘度润滑油。
In order to accurately characterize the thermal characteristics of the motorized spindle during the operation,a new model of bearing heat generation is established in consideration of the influence of the thermal induced preload and the viscosity-temperature effect.Based on the introduction of the thermal contact resistance to the thermal boundary condition,the steady temperature field of the spindle system is obtained by the finite element method,and the influence of main factors on the thermal characteristics of the motorized spindle is analyzed.The calculation results show that The existence of thermal contact resistance increases the overall temperature gradient of the spindle system,which temperature is higher than that without considering thermal contact resistance.The thermal deformation caused by temperature rise not only generates thermally induced preload,but also increases the temperature rise of the bearing.In order to reduce the heat generation of the bearing,low viscosity lubricating oil should be selected at high speed,and high viscosity lubricant should be used at low speed.
作者
雷春丽
张亚斌
杨晓燕
成彦伟
LEI Chun-li;ZHANG Ya-bin;YANG Xiao-yan;CHENG Yan-wei(Key Laboratory of Digital Manufacturing Technology and Application,The Ministry of Education,Lanzhou University of Technology,Gansu Lanzhou 730050,China;School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Gansu Lanzhou 730050,China)
出处
《机械设计与制造》
北大核心
2020年第9期126-131,共6页
Machinery Design & Manufacture
基金
热力耦合作用下高速电主轴动力学分析与实验研究(51465035)。
关键词
电主轴
热诱导预紧力
黏温效应
接触热阻
Motorized Spindle
Thermally Induced Preload
Viscosity-Temperature Effect
Thermal Contact Resist-ance
