一种基于残余热补偿的粉末床熔融增材制造扫描策略。
A residual heat compensation based scan strategy for powder bed fusion additive manufacturing.
作者信息
Yeung H, Lane B
机构信息
National Institute of Standards and Technology, Gaithersburg, MD 20899, United States.
出版信息
Manuf Lett. 2020;25. doi: 10.1016/j.mfglet.2020.07.005.
Typical scan strategies for laser powder bed fusion (LPBF) additive manufacturing systems apply a constant laser power and scan speed. Localized preheating from adjacent scan paths (residual heat) result in inconsistent melt-pool morphology. A new control approach is proposed which compensates the residual heat through laser power adjustment. A model called residual heat factor (RHF) is developed to 'quantify' the residual heat effect, and laser power is controlled proportional to this RHF. Experiments are conducted on a custom-controlled LPBF testbed on nickel-alloy (IN625) bare plate, and the effects of this unique scan strategy are investigated by in-situ melt-pool monitoring.
激光粉末床熔融（LPBF）增材制造系统的典型扫描策略采用恒定的激光功率和扫描速度。相邻扫描路径产生的局部预热（残余热量）会导致熔池形态不一致。本文提出了一种新的控制方法，通过调整激光功率来补偿残余热量。开发了一种名为残余热因子（RHF）的模型来“量化”残余热效应，并根据该RHF成比例地控制激光功率。在定制控制的LPBF试验台上对镍合金（IN625）裸板进行了实验，并通过原位熔池监测研究了这种独特扫描策略的效果。
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