主轴回转精度的混合谱分析法

本文采用动态数据系统建模分析法与改进的周期图检验法相结合,对主轴回转精度进行混合谱分析。应用这种新方法对主轴径向晃动误差的动态检测数据进行处理,着重经统计检验来分清离散谱与连续谱,及分离出其中所含单周以内和双周以上的各种确定性谐波分量,以此作为其系统误差在测量或加工中予以修正。该方法兼顾了提高分辨力和精确度,便于实时修正误差。

THE SPINDLE ROTATION ACCURACY ANALYSIS WITH MIXED SPECTRA

This paper presents a method with mixed spectra for analyzing rotational accuracy of spindles, making use of the modified periodogram test combined with dynamic data system modeling. Through dynamic measurement of the spindle radial shaking error and dynamic data processing with this new method, the discrete spectra and continuous spectrum are identified by statistic test, so as to seperate various determinsctic harmonic components. These components include not only the spindle shaking error within a revolution, but also those involving more than one revolution. Being systematic errors they could be corrected in measurement or consequent machining.The method presented in this paper has the advantage of better resolution, higher estimation accuracy and the possibility of correcting these systematic errors on line.