CAJ | 학술논문

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。
채용기우류체체적법적삼유모형연구안수분사삼유타인기술중균균합금액적적련속침적화응고과정。모형중사용적7075합금구유교대적상변온도범위。모의결과표명：해모형가이흔호지모의출7075합금균균액적적련속침적화응고과정，모의출적액적형상화재상동조건하실험득출적 SEM 도상상문합。액적침적화응고적영향도치액적표면출현수직화“L”형적척상돌기，액적적쾌속응고사탑접처출현세소적지정。
In order to study the successive deposition and solidification processes of uniform alloy droplets during the drop-on-demand three dimensional (3D) printing method, based on the volume of fluid (VOF) method, a 3D numerical model was employed. In this model, the 7075 alloy with larger temperature range for phase change was used. The simulation results show that the successive deposition and solidification processes of uniform 7075 alloy droplets can be well characterized by this model. Simulated droplets shapes agree well with SEM images under the same condition. The effects of deposition and solidification of droplets result in vertical and L-shaped ridges on the surface of droplets, and tips of dendrites appear near the overlap of droplets due to rapid solidification.