Modeling, measurement, and evaluation of spindle radial errors in a miniaturized machine tool
Modeling, measurement, and evaluation of spindle radial errors in a miniaturized machine tool
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DOI：
10.1007/s00170-011-3519-8
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
S. Denis Ashok;G. L. Samuel
中科院分区：
文献类型：
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作者：
S. Denis Ashok;G. L. Samuel
小型化机床已被确立为加工更广泛材料的微型零件的有前途的技术。小型机床的主轴需要在保持精度的同时提供极高的转速。在这项工作中，一个电容传感器为基础的测量技术，用于评估小型化机床主轴的径向误差。主轴误差测量的精度受固有误差源的影响，如传感器偏移、主轴的热漂移、定心误差和安装在主轴中的目标表面的形状误差。本文提出了一种基于模型的曲线拟合方法，用于在时域内对主轴误差测量数据进行准确的解释和分析。文中给出了该方法的实验结果，并与常用的基于离散傅里叶变换的频域滤波方法进行了比较。该方法为主轴误差数据的基频估计提供了更高的分辨率。同步和异步径向误差值根据ANSI/ASME B89.3.4M [9]标准在各种主轴转速和主轴转数下进行评估。结果表明，主轴转速和转速对主轴同步径向误差的影响不大。另一方面，异步径向误差运动表现出显着的速度依赖性行为相对于主轴转数。
Miniaturized machine tools have been established as a promising technology for machining the miniature components in wider range of materials. Spindle of a miniaturized machine tool needs to provide extremely high rotational speed, while maintaining the accuracy. In this work, a capacitive sensor-based measurement technique is followed for assessing radial errors of a miniaturized machine tool spindle. Accuracy of spindle error measurement is affected by inherent error sources such as sensor offset, thermal drift of spindle, centering error, and form error of the target surface installed in the spindle. In the present work, a model-based curve-fitting method is proposed for accurate interpretation and analysis of spindle error measurement data in time domain. Experimental results of the proposed method are presented and compared with the commonly followed discrete Fourier transform-based frequency domain-filtering method. Proposed method provides higher resolution for the estimation of fundamental frequency of spindle error data. Synchronous and asynchronous radial error values are evaluated in accordance with ANSI/ASME B89.3.4M [9] standard at various spindle speeds and number of spindle revolutions. It is found that the spindle speed and number of spindle revolutions does not have much influence on synchronous radial error of the spindle. On the other hand, asynchronous radial error motion exhibits a significant speed-dependant behavior with respect to the number of spindle revolutions.