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oai:riubu.ubu.es:10259/54742023-01-14T23:42:06Zcom_10259_5377com_10259_5086com_10259_2604com_10259_4219col_10259_5378col_10259_4220

00925njm 22002777a 4500 dc Diez Pastor, José Francisco author Gil del Val, Alain author Veiga, Fernando author Bustillo Iglesias, Andrés author 2021-01 Industrial threading processes that use cutting taps are in high demand. However, industrial conditions differ markedly from laboratory conditions. In this study, a machine-learning solution is presented for the correct classification of threads, based on industrial requirements, to avoid expensive manual measurement of quality indicators. First, quality states are categorized. Second, process inputs are extracted from the torque signals including statistical parameters. Third, different machine-learning algorithms are tested: from base classifiers, such as decision trees and multilayer perceptrons, to complex ensembles of classifiers especially designed for imbalanced datasets, such as boosting and bagging decision-tree ensembles combined with SMOTE and under-sampling balancing techniques. Ensembles demonstrated the lowest sensitivity to window sizes, the highest accuracy for smaller window sizes, and the greatest learning ability with small datasets. Fourth, the combination of models with both high Recall and high Precision resulted in a reliable industrial tool, tested on an extensive experimental dataset. 0263-2241 http://hdl.handle.net/10259/5474 10.1016/j.measurement.2020.108328 Bagging Imbalanced datasets Threading Cutting taps Quality assessment High-accuracy classification of thread quality in tapping processes with ensembles of classifiers for imbalanced learning