Thermal error of a hydrostatic spindle

Thermal error of a hydrostatic spindle
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静压主轴的热误差

DOI:
10.1016/j.precisioneng.2011.02.005
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发表时间:
2011-07
影响因子:
3.6
通讯作者:
Dong, Shen
Dong, Shen
中科院分区:
工程技术2区
文献类型:
--
作者:
Chen, Dongju;Bonis, Marc;Zhang, Feihu;Dong, Shen

文献摘要

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提出了一种高精度机床静压主轴的热机械误差模型。通过预测加工过程中机床工作台上的热效应引起的运动误差的变化,该模型可以更深入地了解导致主轴精度变化的潜在机制。计算了主轴元件的热功率和外表面的对流换热系数。在此基础上,利用热弹耦合有限元模型模拟了主轴的温度分布和变形情况,得出了主轴刚度变化对主轴变形的影响。实验测得的推力板在热膨胀条件下的轴向位移与计算的轴向热膨胀十分吻合。
This paper proposes a thermo-mechanical error model of a hydrostatic spindle for a high precision machine tool. By predicting the variation of motion error induced by thermal effects on a machine worktable during machining, this model allows deeper insights into the underlying mechanisms that result in evolutions of the spindle accuracy. The heat power generated in the spindle elements and the coefficients of convection heat transfer over its outer surface have been evaluated. Then, the distribution of temperature and deformation of the spindle have been simulated by a finite element coupled thermo-elastic model, from which the influence on notably spindle stiffness variation was deduced. Experimental measurement of the thrust plate axial displacement under thermal expansion is in close agreement with the computed axial thermal expansion.
DOI: 10.1115/1.2901629
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