Abstract
Chatter is a kind of self-excited vibration, which will result in very poor quality and dimensional accuracy on the machined surface, even a harmful effect on machining operation. A simple, reliable, and accurate chatter identification algorithm is crucial for taking control strategy before it is fully developed. This paper proposes a novel frequency-domain search (FDS) algorithm to identify the chatter during milling. An identification feature based on vibration base frequency is extracted according to the FDS algorithm, where the complicated signal processing algorithms are not needed before feature extraction. Compared with most of the existing identification features, the introduced feature does not need to set thresholds according to different machining conditions. Meanwhile, the feature extraction only needs a small amount of data to guarantee the timeliness of identification. Hammer test and milling experiments with various cutting parameters are carried out, and both force signal and vibration signal in the experiments are utilized to validate the effectiveness of the proposed algorithm. The results show that the proposed algorithm can identify the milling chatter accurately, whether using force signal or vibration signal, even slight chatter in the initial machining stage can be identified. Furthermore, the research reveals that dominant chatter frequencies appear around the natural frequency of the spindle-tool system but do not exactly equal to its natural frequency. The chatter frequencies are found to be determined by the combination of natural characteristics of the system and cutting conditions.
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Abbreviations
- a e :
-
Radial depth of cut (mm)
- a p :
-
Axial depth of cut (mm)
- f C :
-
Vibration base frequency (Hz)
- f cfr :
-
Searching range of the proposed algorithm
- \( {f}_{\mathrm{cfr}}^a \) :
-
Left interval of the searching range (Hz)
- \( {f}_{\mathrm{cfr}}^b \) :
-
Right interval of the searching range (Hz)
- f d :
-
Difference between fIMF and fTPF (Hz)
- f IMF :
-
Identified maximum frequency (Hz)
- f MCF :
-
Multiple chatter frequencies (Hz)
- f SRF :
-
Spindle rotation frequency (Hz)
- f STF :
-
Surface topography frequency (Hz)
- f TPF :
-
Tooth pass frequency (Hz)
- f z :
-
Feed per tooth (Hz)
- Fx, Fy :
-
Cutting force signal in x and y directions, respectively (N)
- k b :
-
Multiple of initial search frequency
- L w :
-
Measured length of surface profile (mm)
- n :
-
Spindle speed (rpm)
- n w :
-
Number of the corrugations in the scope of Lw
- N t :
-
Number of teeth
- Sx, Sy :
-
Spectrum of cutting force signal of x and y directions, respectively
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Acknowledgments
This project is supported by the Natural Science Foundation of Tianjin (No. 18JCQNJC75600), National Natural Science Foundation of China (No. 51705362), and Science & Technology Development Fund of Tianjin Education Commission for Higher Education (No. 2017KJ081).
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Chang, L., Weiwei, X. & Lei, G. Identification of milling chatter based on a novel frequency-domain search algorithm. Int J Adv Manuf Technol 109, 2393–2407 (2020). https://doi.org/10.1007/s00170-020-05789-7
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DOI: https://doi.org/10.1007/s00170-020-05789-7