TY - JOUR
T1 - Vision-based in-situ monitoring system for melt-pool detection in laser powder bed fusion process
AU - Le, Trong Nhan
AU - Lee, Min Hsun
AU - Lin, Ze Hong
AU - Tran, Hong Chuong
AU - Lo, Yu Lung
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided to this study by the Ministry of Science and Technology of Taiwan under Grant No. MOST 109-2218-E-006 . The study was also supported in part by the Ministry of Education, Taiwan , through the Headquarter of University Advancement to the Intelligent Manufacturing Research Center (iMRC), National Cheng Kung University (NCKU).
Publisher Copyright:
© 2021 The Society of Manufacturing Engineers
PY - 2021/8
Y1 - 2021/8
N2 - A low-cost, lateral off-axis non-IR imaging system is proposed to inspect the melt-pool in the Laser Powder Bed Fusion (L-PBF) processing of IN718 powder and stainless steel 316 L powder. In the proposed system, a perspective transformation method is applied to transform the captured side-view image into a top-view image and the melt-pool boundary is then determined based on an inspection of the gray-level intensity profile of the captured image and its first derivative. For the IN718 L-PBF process, the measurement results obtained for the melt-pool width and melt-pool length vary by no more than 13% and 3%, respectively, from the experimental results reported in the literature. For the SS316L, the measured melt-pool width is within 6% of the ex-situ measurements obtained by optical microscopy, while the melt-pool length differs by no more than 9% from the numerical predictions. Overall, the results show that the proposed system provides a viable means of detecting potential build failures during the L-PBF process and improving the yield of the fabrication process as a result.
AB - A low-cost, lateral off-axis non-IR imaging system is proposed to inspect the melt-pool in the Laser Powder Bed Fusion (L-PBF) processing of IN718 powder and stainless steel 316 L powder. In the proposed system, a perspective transformation method is applied to transform the captured side-view image into a top-view image and the melt-pool boundary is then determined based on an inspection of the gray-level intensity profile of the captured image and its first derivative. For the IN718 L-PBF process, the measurement results obtained for the melt-pool width and melt-pool length vary by no more than 13% and 3%, respectively, from the experimental results reported in the literature. For the SS316L, the measured melt-pool width is within 6% of the ex-situ measurements obtained by optical microscopy, while the melt-pool length differs by no more than 9% from the numerical predictions. Overall, the results show that the proposed system provides a viable means of detecting potential build failures during the L-PBF process and improving the yield of the fabrication process as a result.
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U2 - 10.1016/j.jmapro.2021.07.007
DO - 10.1016/j.jmapro.2021.07.007
M3 - Article
AN - SCOPUS:85109932098
SN - 1526-6125
VL - 68
SP - 1735
EP - 1745
JO - Journal of Manufacturing Processes
JF - Journal of Manufacturing Processes
ER -