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

doi:10.1117/12.2541928

16 October 2019 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, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019); 112051H (2019) https://doi.org/10.1117/12.2541928
Event: Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 2019, Phuket, Thailand

Abstract

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.

Citation Download Citation

Piyao He, Kai Zhong, Xingjian Liu, Gang Zhou, Congjun Wang, Qingsong Wei, Yusheng Shi, and Zhongwei Li "A phase-guided method for extracting the contour of the fusion area in laser powder bed fusion", Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 112051H (16 October 2019); https://doi.org/10.1117/12.2541928

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KEYWORDS

Additive manufacturing

Edge detection

Cameras

Image processing

Laser sintering

Sensors

Phase measurement

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