Abstract
Predicting chatter stability in a micro-milling operation is challenging since the experimental identification of the tool-tip dynamics is a complicated task. In micro-milling operations, in-process chatter monitoring strategies can use acoustic emission signals, which present an expressive rise during unstable cutting. Several authors propose different time and frequency domain metrics for chatter detection during micro-milling operations. Nevertheless, some of them cannot be exploited during cutting since they require long acquisition periods. This work proposes an in-process chatter detection method for micro-milling operation. A sliding window algorithm is responsible for extracting datasets from the acoustic emissions using optimal window and step packet sizes. Nine statistical-based features are derived from these datasets and used during training/testing phases of machine-learning classifiers. Once trained, machine learning classifiers can be used in-process chatter detection. The results assessed the trade-off between the number of features and the complexity of the classifier. On the one hand, a Perceptron-based classifier converged when trained and tested with the complete set of features. On the other hand, a support vector classifier achieved good accuracy values, false positive and negative rates, considering the two most relevant features. A classifier’s output is derived at every step; therefore, both proposals are suitable for in-process chatter detection.
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This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. Also, the authors would like to thank the Brazilian funding agencies: CNPq 303884/2021-5, and FAPESP 2019/00343-1.
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All authors contributed to the study’s conception and design. Kandice Ribeiro, Giuliana Venter, and Alessandro Roger Rodrigues performed material preparation and data collection. Guilherme Serpa Sestito performed conceptualization of this study, methodology, and software. Maíra Martins da Silva also worked on conceptualizing this study and data curation. The first draft of the manuscript was written by Guilherme Serpa Sestito and Maíra Martins da Silva, and all authors commented on previous versions of the manuscript. Finally, all authors read and approved the final manuscript.
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Sestito, G.S., Venter, G.S., Ribeiro, K.S.B. et al. In-process chatter detection in micro-milling using acoustic emission via machine learning classifiers. Int J Adv Manuf Technol 120, 7293–7303 (2022). https://doi.org/10.1007/s00170-022-09209-w
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DOI: https://doi.org/10.1007/s00170-022-09209-w