Modeling of the motorized spindle temperature field considering the thermos-mechanical coupling on constant pressure preloaded bearings

IF 2.9 3区 工程技术 Q2 AUTOMATION & CONTROL SYSTEMS
Dongxu Su, Yang Li, Wanhua Zhao, Zhe Nie, Huijie Zhang
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Abstract

The thermal characteristics of the motorized spindle significantly affect the machining accuracy and efficiency, and many thermal models have been developed to investigate the factors that affect the spindle thermal characteristics. However, the thermomechanical coupling of the bearings with constant pressure preload is rarely considered in the present works. Thus, this paper developed a transient temperature model of motorized spindle to study the influence of the radial thermal stress on the heat generation of the constant pressure preloaded bearings. In this research, an analytical thermal stress model was established first by simplifying the components of the bearings into a rotating ring geometry to calculate the thermal stress loaded on the bearings. Meanwhile, a transient temperature model of the motorized spindle was established based on the finite element method (FEM). Then, the analytical model was integrated into the spindle transient thermal model, so that the heat generated by bearings and the motorized spindle temperature can be revised constantly, through the iterative calculation between these two models. Finally, verification experiments with different work conditions clarify that the proposed transient thermal characteristic model of the motorized spindle is valid, and the study shows that it is necessary to consider the bearing heat generation induced by the radial thermal stress when the spindle runs at a high speed.

Abstract Image

考虑到恒压预载轴承上的热机械耦合的电动主轴温度场建模
电主轴的热特性对加工精度和效率有很大影响,人们已经建立了许多热模型来研究影响主轴热特性的因素。然而,目前的研究很少考虑恒压预紧轴承的热机械耦合问题。因此,本文建立了电动主轴的瞬态温度模型,以研究径向热应力对恒压预载轴承发热的影响。在这项研究中,首先建立了一个分析热应力模型,将轴承部件简化为旋转环几何形状,以计算轴承上的热应力。同时,基于有限元法(FEM)建立了电主轴的瞬态温度模型。然后,将分析模型集成到主轴瞬态热模型中,通过两个模型之间的迭代计算,不断修正轴承产生的热量和电主轴温度。最后,在不同工况下进行的验证实验表明,所提出的电主轴瞬态热特性模型是有效的,研究还表明,有必要考虑电主轴高速运转时径向热应力引起的轴承发热。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.70
自引率
17.60%
发文量
2008
审稿时长
62 days
期刊介绍: The International Journal of Advanced Manufacturing Technology bridges the gap between pure research journals and the more practical publications on advanced manufacturing and systems. It therefore provides an outstanding forum for papers covering applications-based research topics relevant to manufacturing processes, machines and process integration.
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