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Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets
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Xin TIAN, Junwei ZHONG, Youwen YANG, Chaolei ZHANG, Long ZHAO. Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .
@article{title="Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets",
author="Xin TIAN, Junwei ZHONG, Youwen YANG, Chaolei ZHANG, Long ZHAO",
journal="Journal of Zhejiang University Science A",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2400292"
}
%0 Journal Article
%T Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets
%A Xin TIAN
%A Junwei ZHONG
%A Youwen YANG
%A Chaolei ZHANG
%A Long ZHAO
%J Journal of Zhejiang University SCIENCE A
%V -1
%N -1
%P
%@ 1673-565X
%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2400292
TY - JOUR
T1 - Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets
A1 - Xin TIAN
A1 - Junwei ZHONG
A1 - Youwen YANG
A1 - Chaolei ZHANG
A1 - Long ZHAO
J0 - Journal of Zhejiang University Science A
VL - -1
IS - -1
SP -
EP -
%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2400292
Abstract: Mounds of spatter are generated in laser powder-bed fusion (L-PBF) additive manufacturing, which reduces build quality and laser lifetime. Due to the lack of supplemental airflow above the chamber, the conventional build chamber with a single gas inlet exhibits a pronounced tendency for gas to flow upward near the outlet. This phenomenon results in the formation of a large vortex within the build chamber. The vortex leads to the chaotic motion trajectory of the spatter in the build chamber. The design defects of the existing build chamber based on dual gas inlets are shown in this paper. We established a CFD-DPM model to optimize the build chamber by adjusting the position and structure of the second gas inlet. The homogeneity of the flow is increased with a distance of 379 mm between the two inlets and a wider-reaching second inlet. The coanda effect is also crucial in the spatter-removal process. The coanda effect is reduced by modifying the right sidewall of the build chamber and increasing the pressure difference between the inlet and outlet. Finally, we found that the spatter-removal rate rose from 8.9% to 76.1% between the conventional build chamber with a single gas inlet and the optimized build chamber with two gas inlets.
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