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dc.contributor.author Hendriks, Adriaan J
dc.contributor.author Ramokolo, Lesiba R
dc.contributor.author Ngobeni, Christopher M
dc.contributor.author Moroko, Matome C
dc.contributor.author Naidoo, Darryl
dc.date.accessioned 2019-10-25T08:20:10Z
dc.date.available 2019-10-25T08:20:10Z
dc.date.issued 2019-03
dc.identifier.citation Hendriks, A.J., Ramokolo, L.R., Ngobeni, C.M., Moroko, M.C. & Naidoo, D. 2019. Layer-wise powder deposition defect detection in additive manufacturing. In: Proceedings of SPIE 10909, Laser 3D Manufacturing VI, 109090O, San Francisco, California, USA, March 2019 en_US
dc.identifier.isbn 978-1-510-62460-3
dc.identifier.isbn 978-1-510-6246-10
dc.identifier.uri https://doi.org/10.1117/12.2509571
dc.identifier.uri https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10909.toc?SSO=1
dc.identifier.uri https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10909/109090O/Layer-wise-powder-deposition-defect-detection-in-additive-manufacturing/10.1117/12.2509571.full9
dc.identifier.uri http://hdl.handle.net/10204/11183
dc.description Presented in: Proceedings of SPIE 10909, Laser 3D Manufacturing VI, 109090O, San Francisco, California, USA, March 2019. Due to copyright restrictions, the attached PDF file contains the abstract of the full-text item. For access to the full-text item, please consult the publisher's website. en_US
dc.description.abstract Additive manufacturing applications, in areas such as aerospace and medicine, are limited due to the lack of process stability and quality management. In particular, geometrical inaccuracies and the presence of mechanical defects hinder repeatability of the process1. A great disadvantage of AM is that verifying the quality of AM produced parts are mainly done after part fabrication which does not allow the operator to act upon defects observed during the actual build. To break into industries with very high quality standards, an important issue to be addressed is in-situ quality control during a build2, 3. If defects on a new powder layer can be detected before laser melting occurs, a new layer may be suitably recoated or the process can be paused for user controlled rectification. The work which will be presented here is focused on image based process monitoring of a powder bed additive manufacturing system using a shadow casting method. As a proof of principle, a few main defects during recoating will be identified and analyzed to establish the severity and possible impact of the defects on metal powder consolidation. Preliminary results of defects identified before and after material consolidation will be shown. For this, a software package is in development to automatically detect defects. This is aimed towards developing a system which in the future will contribute to quality assurance. en_US
dc.language.iso en en_US
dc.publisher SPIE en_US
dc.relation.ispartofseries Workflow;22788
dc.subject High resolution imaging en_US
dc.subject Image processing en_US
dc.subject In-line quality control en_US
dc.subject In situ process monitoring en_US
dc.subject Powder deposition defects en_US
dc.title Layer-wise powder deposition defect detection in additive manufacturing en_US
dc.type Presentation en_US


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