Simulation of thermal behavior of a CNC machine tool spindle
Simulation of thermal behavior of a CNC machine tool spindle
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DOI：
10.1016/j.ijmachtools.2006.06.018
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发表时间：
2007-05
影响因子：
14
通讯作者：
Haitao Zhao;Jian-guo Yang;Jinhua Shen
中科院分区：
文献类型：
--
作者：
Haitao Zhao;Jian-guo Yang;Jinhua Shen
数控机床主轴的热变形是造成机床热误差的主要原因。研究如何准确地模拟主轴的热误差具有重要的理论意义和实际意义。首先，参考空气沿平面流动时平面对流换热系数的计算理论，提出了一种计算主轴表面对流换热系数的方法。其次，采用有限元法对主轴在热载荷作用下的温度场和热误差进行了动态模拟。第三，根据仿真结果分析了主轴内部的热流和热变形特性。第四，基于热误差敏感技术，给出了建立鲁棒热误差模型所必需的热关键点的选取原则。最后，在数控车削中心上进行了验证实验，结果表明仿真结果令人满意，可以代替实验结果进行进一步的研究。
The thermal deformations of a CNC machine tool spindle are the major contributor of thermal error. It is very significant both theoretically and practically to study how to accurately simulate the thermal error of the spindle. Firstly, this paper proposes a method for computing the coefficient of convection heat transfer of the spindle surface by referencing the theory on computing the coefficient of convection heat transfer of a flat plate when air flows along it. Secondly, the temperature field and thermal errors of the spindle are dynamically simulated under the actions of thermal loads using the finite element method. Thirdly, the characteristics of heat flow and thermal deformation within the spindle are analyzed according to the simulation results. Fourthly, the selection principle of thermal key points, which are indispensable for building a robust thermal error model, is provided based on the thermal error sensitivity technology. At last, a verification experiment is implemented on a CNC turning center, and the results show the simulation results are satisfying to replace the experiment results for further studies.