Mr. Piyao He Profile

Piyao He

at Huazhong Univ of Science and Technology

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Proceedings Article | 16 October 2019 Paper

A phase-guided method for extracting the contour of the fusion area in laser powder bed fusion

Piyao He, Kai Zhong, Xingjian Liu, Gang Zhou, Congjun Wang, Qingsong Wei, Yusheng Shi, Zhongwei Li

Proceedings Volume 11205, 112051H (2019) https://doi.org/10.1117/12.2541928

KEYWORDS: Additive manufacturing, Edge detection, Cameras, Image processing, Laser sintering, Sensors, Phase measurement

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Process signatures of the fusion area directly determine the quality of the part in Laser Powder Bed Fusion (LPBF). The geometric contour of the fusion area is one of the most important indicators of manufacturing quality. The accurate detection of the contour has been generating considerable interest. However, due to the complex operating condition in LPBF, the 2D images of the fusion area suffer from shortcomings such as poor contrast, high noise, and vary illumination. This makes the location of the contour extremely difficult for traditional detection methods. In this study, a robust contour detection method of the fusion area in LPBF is proposed. In order to raise the contrast of the contour, the phase image with clear contour details will be calculated from a series of fringe images with phase shift projected onto the fusion area. A phase-guided contour extraction method is conducted to accurately locate the center of contour which reduces significantly the impact of the severe manufacturing condition. Experimental results reveal that the proposed method can obtain the contours of the fusion area in a very short time, with higher accuracy and repeatability. In addition, it also holds the potential to be an effective way to monitor the geometric defects layer-wise.

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