Development of powder flow model of laser solid forming by analysis method
Development of powder flow model of laser solid forming by analysis method
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DOI：
10.1007/s00170-015-7481-8
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
H. Tan;Fengying Zhang;Xingling Fu;Jian-ping Meng;Guang Hu;W. Fan;Weidong Huang
中科院分区：
文献类型：
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作者：
H. Tan;Fengying Zhang;Xingling Fu;Jian-ping Meng;Guang Hu;W. Fan;Weidong Huang
激光固体成型（LSF）是一种很有前途的增材制造技术。粉末流动在 LSF 过程中起着重要作用。在这项研究中，基于通量平衡和引入特定参数，开发了一个实用模型来模拟具有四个对称尖端的不连续同轴喷嘴的粉末流动。进行了送粉过程观测实验，得到了具体的粉体流动参数和粉体流动送料行为。可以发现，由于引入了特定的粉末流动参数，粉末流动的模拟与实验测量吻合得很好。此外，还可以发现，粉末质量浓度的峰值位于粉末流理论焦点位置之上。此外，该分析模型用于计算沉积层高度。结果表明，由于粉末质量浓度的变化，沉积层尺寸随着沉积表面与喷嘴出口平面之间的距离而显着变化。可以得出结论，粉末流动分析模型对于建立沉积层形成模型来分析LSF过程具有潜在的用途。
Laser solid forming (LSF) is a promising additive manufacturing technology. Powder flow plays an important role during the LSF process. In this study, based on the flux balance and the introduction of specific parameters, a practical model was developed to simulate the powder flow of the discontinuous coaxial nozzle with four symmetrical tips. The observation experiments of powder feed process were carried out, and the specific powder flow parameters and the powder flow feed behavior were obtained. It can be found that the simulations of the powder flow agreed well with the experimental measurements due to the introduction of specific powder flow parameters. In addition, it can be also found that the peak value of the powder mass concentration is above the theoretical focus position of the powder flow. Further, the analysis model was used for the calculation of the deposition layer height. It was showed that the deposition layer size varied significantly with the distance between the deposited surface and the nozzle exit plane due to the variation of the powder mass concentration. It can be concluded that the analysis model of powder flow has potential use for building the deposition layer formation model to analyze the LSF process.