Modelling of Powder Removal for Additive Manufacture Postprocessing
Modelling of Powder Removal for Additive Manufacture Postprocessing
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DOI：
10.20944/preprints202106.0688.v1
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发表时间：
2021-06
影响因子：
3.2
通讯作者：
A. Roberts;R. Kahraman;D. Bacheva;G. Tabor
中科院分区：
文献类型：
--
作者：
A. Roberts;R. Kahraman;D. Bacheva;G. Tabor
支持增材制造（AM）作为一种技术的一个关键挑战是制造组件的后处理。对于选择性激光烧结（SLS），这可能涉及从部件内部去除粉末，通常通过振动部件以流化粉末以促进排水。在本文中，我们开发并验证了一个计算模型的金属粉末的流动，适合于预测从这样的AM组件的粉末去除。该模型是一个连续欧拉多相模型的粉末，包括模型的颗粒温度;振动的影响，可以包括通过适当的壁边界的颗粒温度。我们通过与内部和文献实验结果的比较来验证适合AM金属粉末的各个子模型，然后将完整模型应用于AM热交换器的更复杂的几何形状。该模型提供了有价值的和准确的结果在一个基于粒子的模型的计算成本的一小部分。
A critical challenge underpinning the adoption of Additive Manufacture (AM) as a technology is the postprocessing of manufactured components. For Selective Laser Sintering (SLS) this can involve the removal of powder from the interior of the component, often by vibrating the component to fluidise the powder to encourage drainage. In this paper we develop and validate a computational model of the flow of metal powder suitable for predicting powder removal from such AM components. The model is a continuum Eulerian multiphase model of the powder including models for the granular temperature; the effect of vibration can be included through appropriate wall boundaries for this granular temperature. We validate the individual sub-models appropriate for AM metal powders by comparison with in-house and literature experimental results, and then apply the full model to a more complex geometry typical of an AM Heat Exchanger. The model is shown to provide valuable and accurate results at a fraction of the computational cost of a particle-based model.