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Meeting 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
Symposium Special Session
Presentation Title Multi-modal In-situ Monitoring Data Analysis for Overhang Features Built with Laser Powder Bed Fusion
Author(s) Ndeye Yande Yande Clarisse Ndiaye, Zhuo Yang, Simin Li, Jennifer Li, Yan Lu, Brandon Lane, Ho Yeung
On-Site Speaker (Planned) Ndeye Yande Yande Clarisse Ndiaye
Abstract Scope Part geometry in the powder bed fusion process decides the cross-section of layer slices which impact the mechanism of the support structure. The overhang down-skin surface receives support purely from powders showing poor geometric accuracy and surface roughness. This study collects in-situ coaxial melt pool and layerwise overview images to investigate the dimensional deviations in overhang regions based on a part designed with several overhang features. Statistical analysis within crossed layers and modalities is conducted to retrieve common features and find correlations between multi-modal observations. Both the layerwise pixel (LWP) index and melt pool monitoring (MPM) index strongly correlate to the overhang features of different gradients. The LWP index at the overhang down-skin region is noticeably higher than in the regular region, similar to the MPM index on microscale regional analysis. The results match the observations from XCT scan and provide a way to do fast anomaly detection in real-time.
Proceedings Inclusion? Definite: Post-meeting proceedings

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