粉末床激光成形熔池辐射强度信号的机器学习

doi:10.7527/S1000-6893.2021.25855

Abstract

Abstract: Process monitoring and quality identification of Powder Bed Fusion (PBF) are the key technologies to ensure its manufacturing quality. Among the monitoring signals, the molten pool radiation intensity signal contains rich molten pool characteristic information, but the direct connection between the monitoring signal and the material science phenomenon is not clear, and it is suitable to use machine learning algorithms to carry out in-depth research. Through 316L stainless steel forming experiments, different process parameters (partial deviation from the process window) are set, and the emission intensity signal of the molten pool is collected during the forming process. The signal data are preprocessed through data segmentation, feature extraction and feature selection, and a data set for machine learning is constructed. Twenty-one different machine learning algorithms are used. The molten pool emission intensity data are firstly classified according to the process parameters (such as high, medium, and low laser power). The trained algorithms can identify abnormalities (abnormal emission intensity, representative laser power and scanning speed deviate from the best state). Secondly, the emission intensity data of the molten pool are classified according to the quality (density, surface roughness) of the final formed block, and the quality can be identified in actual production through the trained algorithms. The results show that for the identification of abnormalities of the emission intensity of the molten pool, the classification effect of the secondary support vector machine algorithm is the best, with an accuracy of over 96.4%. For prediction of density and surface roughness, the prediction results show different distributions due to the complex relationship between the sample quality and the data sample, but the prediction accuracy has reached more than 96.0%.

Key words: machine learning, laser powder bed fusion, molten pool emission intensity, abnormality identification, quality identification

CLC Number:

V261
TP391.4

DUAN Yucong, WANG Xuede, ZHOU Xin, ZHANG Peiyu, GUO Xiyang, CHENG Xing, FAN Junwei. Machine learning of emission intensity signal of laser powder bed fusion molten pool[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(9): 425855.

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Machine learning of emission intensity signal of laser powder bed fusion molten pool

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