基于Fluent的重力铸造充型凝固过程数值模拟研究  

Numerical Simulation Study on Filling and Solidification Process of Gravity Casting Based on Fluent

作　　者：邱常明 谭宽 QIU Chang-ming;TAN Kuan(College of Mechanical Engineering,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学机械工程学院,河北唐山063210

出　　处：《机械工程与自动化》2020年第2期72-75,共4页Mechanical Engineering & Automation

摘　　要：拉伸试棒广泛应用于新材料、新工艺的开发,而标准拉伸试棒铸造模具体积大,造成材料的浪费;型腔截面变化复杂,充型过程中会产生飞溅,在铝合金铸造时容易产生冷隔、浇不足和缩松等缺陷。针对这一情况,设计了一种体积小、截面简单的模具,并用Fluent软件对A357铝合金重力铸造工艺进行了模拟,研究温度场和流场的变化规律,实现充型过程热流耦合和凝固过程的温度场计算,并预测铸件质量。研究结果表明,新模具充型良好,速度平稳,凝固时试棒位置能够有效补缩,消除了缩松缺陷。Tensile test rods are widely used in the development of new materials and processes,while the standard tensile test rod casting mold has a large volume and causes waste of materials.The cross section of the cavity is complicated,and splashing will occur during the filling process,and defects such as cold insulation,insufficient pouring and shrinkage porosity are easy to occur during the casting of aluminum alloy.In view of this situation,this paper designs a mold with small volume and simple cross-section,and simulates the gravity casting process of A357 aluminum alloy with Fluent software.The change law of temperature field and flow field is studied,the temperature field calculation of the heat flow coupling and solidification process in the filling process is realized,and the casting quality is predicted.The results show that the new mold is well filled,the speed is stable,the position of the test rod can be effectively feeding during solidification,and the shrinkage porosity defect is eliminated.

关 键 词：重力铸造 充型 凝固 数值模拟 FLUENT 

分 类 号：TG244[金属学及工艺—铸造]