An Investigation into Error Source Identification of Machine Tools Based on Time-Frequency Feature Extraction

This paper presents a new identification method to identify the main errors of the machine tool in time-frequency domain. The low-and high-frequency signals of the workpiece surface are decomposed based on the Daubechies wavelet transform. With power spectral density analysis, the main features of the high-frequency signal corresponding to the imbalance of the spindle system are extracted from the surface topography of the workpiece in the frequency domain. With the cross-correlation analysis method, the relationship between the guideway error of the machine tool and the low-frequency signal of the surface topography is calculated in the time domain.