高速电主轴轴承预紧力及其对回转性能的影响

发布时间：2021-10-23 05:27

　　高精密机床所生产的产品的加工精确高度依赖于电主轴的性能,轴承预紧力作为影响高速电主轴性能的重要因素之一,为高速运转的主轴系统提供了必要刚度。选择适当的轴承轴向预紧力,既可以为电主轴提供所需的刚度,减少高速旋转产生的振动,又能避免加工时产生过度的热量。因此,研究和分析轴承预紧状态及其与电主轴动态特性的关系,对提高高端数控机床主轴的回转精度和动态性能具有重要意义。本文首先研究了轴承滚动体与滚道的接触特性随预紧力的变化规律。利用赫兹接触理论,研究了轴承基本几何关系和不同预紧载荷条件下及角接触球轴承接触刚度和接触变形。提出了一种确定不同轴承轴向预紧力下接触电阻的新方法,并进行了角接触球轴承接触电阻的实验研究,结果表明,随着轴承轴向预紧力的增大,接触电阻减小,呈现“L”型趋势,二者且具有非线性关系。对于具体轴承,当预紧力大于某一值时,接触面积不再随预紧力的增大而明显增大。随后,本文研究了背对背安装角接触球轴承对的轴向预紧力对转子回转精度的影响。设计了实验测试台架,考虑了轴承内圈与轴的配合状态,测试了轴承外圈径向跳动随轴向预紧力的变化规律。结果表明,随着预紧力增大,径向跳动呈现“降-升-降”,最后... 

【文章来源】：上海交通大学上海市 211工程院校 985工程院校 教育部直属院校

【文章页数】：104 页

【学位级别】：硕士

【文章目录】：
摘要
ABSTRACT
Chapter1 Introduction
    1.1 Background and Sources
        1.1.1 Background
        1.1.2 Sources
    1.2 Literature review
        1.2.1 Structure of High-Speed Motorized Spindle
        1.2.2 Research status
    1.3 Research objective and chapter arrangement
        1.3.1 Research objective
        1.3.2 Chapter arrangement
Chapter2 High-speed motorized spindle bearing preload and contact characteristics
    2.1 Angular contact ball bearing
        2.1.1 Angular contact ball bearing geometry
        2.1.2 Angular contact ball bearing preload analysis
    2.2 Bearing Contact analysis and stiffness calculation
        2.2.1 Hertz Contact theory
        2.2.2 Contact deformation and stiffness calculation
    2.3 Bearing contact resistance analysis
        2.3.1 Four terminal sensing system
        2.3.2 Bearing contact resistance measurement
        2.3.3 Contact resistance measurement experiment
    2.4 Chapter summary
Chapter3 High-speed motorized spindle bearing preload and rotational performance analysis
    3.1 High-speed motorized spindle bearing preload
        3.1.1 Bearing preload design and clamping load distribution
        3.1.2 Factors affecting the bearing preload
    3.2 Measurement of bearing preload
        3.2.1 Evaluation of fixed position preload from starting torque and preload relationship
        3.2.2 Measurement of constant pressure preload
    3.3 Analysis of spindle assembly parameters relation with bearing preload
        3.3.1 Bearing radial deformation under shaft bearing interference fit and preload
        3.3.2 Bearing radial clearance and runout measurement
    3.4 Chapter summary
Chapter4 Dynamic characteristics analysis of high-speed motorized spindle
    4.1 Free vibration analysis of high-speed motorized spindle shaft
        4.1.1 Rigid and flexible shaft
        4.1.2 Finite element analysis of spindle shaft
        4.1.3 Experimental analysis of shaft free vibration
    4.2 Modal analysis of the high-speed motorized spindle under different preload condition
        4.2.1 Experimental modal analysis
        4.2.2 Modal Experiment Frequency spectrum analysis
    4.3 Vibration analysis of the high-speed motorized spindle
        4.3.1 Vibration experiment under different preload
        4.3.2 Vibration frequency spectrum analysis
    4.4 Dynamic parameters for preload optimization
    4.5 Chapter summary
Chapter5 Summary and prospect
    5.1 Summary of the thesis
    5.2 Innovative points
    5.3 Future work
第6章 全文总结与展望
    6.1 论文主要内容与结论
    6.2 论文创新点
    6.3 后续研究展望
References
Acknowledgement
Academic achievements


【参考文献】：
期刊论文
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[2]过盈配合量和预紧力对高速角接触球轴承刚度的影响[J]. 王硕桂,夏源明.  中国科学技术大学学报. 2006(12)
[3]高速精密角接触球轴承最小预紧载荷计算[J]. 蒋兴奇,马家驹,范谷耘.  轴承. 2001(06)
[4]精密机床主轴轴承的预紧力控制[J]. 郭明,陈宗农,王庆九.  工程设计. 2001(02)
[5]轴承使用时的预紧情况分析[J]. 王雪清.  轴承. 2001(02)
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