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采用基于流体体积法的三维模型研究按需喷射三维打印技术中均匀合金液滴的连续沉积和凝固过程。模型中使用的7075合金具有较大的相变温度范围。模拟结果表明:该模型可以很好地模拟出7075合金均匀液滴的连续沉积和凝固过程,模拟出的液滴形状和在相同条件下实验得出的SEM图像相吻合。液滴沉积和凝固的影响导致液滴表面出现垂直和“L”形的脊状突起,液滴的快速凝固使搭接处出现细小的枝晶。
The three-dimensional model based on the fluid volume method was used to study the continuous deposition and solidification of uniform alloy droplets in on-demand 3D printing. The 7075 alloy used in the model has a large phase transition temperature range. The simulation results show that the model can simulate the continuous deposition and solidification of the uniform 7075 alloy droplets. The simulated droplet shape is consistent with the experimental SEM images under the same conditions. The influence of droplet deposition and solidification results in vertical and “L ” shaped ridges on the droplet surface. The rapid solidification of the droplet causes small dendrites to overlap.