金属熔融涂覆成形工艺数值模拟与实验验证  

Numerical Simulation and Experimental Investigation of Metal Fused-coating Additive Manufacturing Process

作　　者：张育斌 杜军[2] 王鑫[2] 涂晶洁 ZHANG Yubin;DU Jun;WANG Xin;TU Jingjie(School of 3D Printing,Ningbo University of Finance and Economics,Ningbo 315175,China;State Key Laboratory of Manufacturing System Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]宁波财经学院3D打印特色学院,浙江宁波315175 [2]西安交通大学机械制造系统工程国家重点实验室,陕西西安710049

出　　处：《热加工工艺》2020年第4期101-105,共5页Hot Working Technology

基　　金：浙江省公益技术研究项目(LGG18E050015).

摘　　要：针对金属熔融涂覆增材制造工艺,基于VOF函数和分段线性界面重构方法建立熔融涂覆沉积过程熔体热流场数值计算模型,分析了成形过程中沉积层表面的热力学行为及沉积层形貌的演变行为,利用该模型可获得熔凝区形态及温度场信息。研究了成形质量、沉积层形貌与冶金缺陷间的关系,并对数值计算模型进行了实验验证。结果表明:沉积层形貌计算值与实验值吻合较好,熔融涂覆沉积过程数值计算模型能有效地描述涂覆沉积过程中熔体内的铺展流动和凝固行为。采用热成像系统可实时监测沉积层表面温度信息。沉积层之间重熔结构及内部质量良好,无明显孔隙等缺陷。上述研究为深入理解金属熔融涂覆成形工艺中的复杂物理过程和成形工艺参数的优化提供理论指导。Aiming at metal fused-coating additive manufacturing(MFCAM)process,a numerical model of thermal flow field of the melt in the process was established using the volume of fluid(VOF)method and piecewise linear interface construction(PLIC).The thermodynamics behaviors of deposited-layer surface during the MFCAM process were analyzed,and the evolution of surface morphology was investigated.The information on the temperature fields and the morphology of the melting and solidification regions could be obtained by the current model.Moreover,the relationship between forming quality,forming morphology and metallurgical defects was investigated,and the numerical models were validated against experimental results.The results show that the calculation results of the morphology of the deposition layer agree well with the experimental results,which can reflect the spreading and solidification behavior of the liquid metal.The real-time temperature information of deposition surface can be obtained by thermal imaging system.The good metallurgical bonding can be achieved between deposited layers,and there are no obvious defects such as pores and incomplete fusion.Based on the above research,the theoretical guidance for understanding of complex thermal physics and optimization of process parameters could be achieved.

关 键 词：金属增材制造 铝合金 熔融涂覆成形 数值模拟 

分 类 号：TG174.4[金属学及工艺—金属表面处理]