Chatter Feature Extraction Method in Variable Cutting Depth Flank Milling Based on VMD and FFT

doi:10.12068/j.issn.1005-3026.2018.08.018

Abstract

Abstract: A chatter frequency band extracting method combining the variational mode decomposition (VMD) and fast Fourier transform (FFT) was proposed for extracting the obscure chatter frequency band in milling process， making good basis of further extracting the chatter feature value. To obtain the frequency band including chatter frequency， the variable cutting depth flank milling experiment was carried out and the forces were measured in the experiment. A method of choosing the number of modes in the VMD by combining the FFT spectrum was proposed. The simulation signal and experiment signal were extracted by the above method. The results show that the method of combining the VMD and FFT can effectively extract the chatter frequency bands in milling， which offers a new method to extract the chatter feature.

Key words: chatter in flank milling, feature extraction, VMD, variable cutting depth, thin-walled workpiece

CLC Number:

TH17

LIU Chang-fu， ZHU Li-da， QIU Jian， LI Ming. Chatter Feature Extraction Method in Variable Cutting Depth Flank Milling Based on VMD and FFT[J]. Journal of Northeastern University Natural Science, 2018, 39(8): 1153-1157.

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