Journal
ADDITIVE MANUFACTURING
Volume 36, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2020.101453
Keywords
Additive manufacturing; Machine learning; Convolutional neural network; In-situ anomaly detection; Semantic segmentation
Funding
- Transformational Challenge Reactor (TCR) program
- US Department of Energy, Office of Nuclear Energy
- NextManufacturing Center at Carnegie Mellon University
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Increasing industry acceptance of powder bed metal Additive Manufacturing requires improved real-time detection and classification of anomalies. Many of these anomalies, such as recoater blade impacts, binder deposition issues, spatter generation, and some porosities, are surface-visible at each layer of the building process. In this work, the authors present a novel Convolutional Neural Network architecture for pixel-wise localization (semantic segmentation) of layer-wise powder bed imaging data. Key advantages of the algorithm include its ability to return segmentation results at the native resolution of the imaging sensor, seamlessly transfer learned knowledge between different Additive Manufacturing machines, and provide real-time performance. The algorithm is demonstrated on six different machines spanning three technologies: laser fusion, binder jetting, and electron beam fusion. Finally, the performance of the algorithm is shown to be superior to that of previous algorithms presented by the authors with respect to localization, accuracy, computation time, and generalizability.
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