摘要
环境温度改变会导致机床产生热误差,因此在机床设计初期应着重考虑机床的热态特性。以某立式钻攻中心为研究对象,通过有限元法,对机床整体和各个部件分别进行了热模态分析,并基于响应曲面法对机床与环境温度之间的对流换热系数进行了修正。结果表明,当床身、立柱的对流换热系数为9.48 W/m^2·K,工作台和主轴箱等零部件的对流换热系数为时7.75 W/m^2·K,有限元仿真结果与实验测得的误差为13.5%,具有较高的预测精度。
Ambient temperature fluctuates every day with time and season.Machine is usually placed in non-constant temperatureworkshop,and machine tools generate thermal error due to the change of ambient temperature.Therefore,early design of the machineshould focus on considering the thermal characteristics of the machine.In this paper,a new type of machine tool developed by ShenyangMachine Tool Plant is taken as the research object.The finite element method is used to conduct thermal modal analysis for the wholemachine and the parts,and the convective heat transfer coefficient between the machine and the ambient temperature is corrected based onthe response surface method.The results show that,when the convective heat transfer coefficient of the table and the spindle box is9.48W/m2·K,and the convection heat transfer coefficient of the bed and column is7.75W/m2·K,the error between the finite element simulationresults and the experimental measurement is of13.5%,with high prediction accuracy.
作者
王恒
柳超
Wang Heng;Liu Chao(College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
出处
《农业装备与车辆工程》
2017年第10期92-95,共4页
Agricultural Equipment & Vehicle Engineering
关键词
机床热特性
有限元
响应面法
热误差
machine tool thermal characteristics
finite element
response surface method
thermal error
