(1. 哈尔滨工业大学 微纳米技术研究中心, 哈尔滨 150001；
2. 哈尔滨工业大学 材料科学与工程学院, 哈尔滨150001)
摘 要: 修正了传统Navier-Stoke方程，并利用该方程和Fluent软件对Zn-4Al合金充填微齿轮铸件的充型过程进行数值模拟。结果表明：在运动惯性的作用下，Zn-4Al合金在进入微齿轮型腔后途径齿轮盘部位时，合金并未横向扩展，而是保持入射状态首先填充对面的齿轮轴，撞击型腔壁后，产生二次压头，然后再向齿轮外围的各齿部位反充；型腔内气体被高速运动的金属液搅拌和切割，形成许多微气泡，然后被带入主流区，从排气道排除。
关键字: ZnAl合金；微齿轮铸件；数值模拟；充型过程
（1. Research Center of Micro/nano Technology, Harbin Institute of Technology, Harbin 15001, China；
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The filling process of micro-gear casting with Zn-4Al alloy was simulated by applying the modified traditional Navier-Stoke equation and the Fluent software. The results show that the alloy is not horizontal expansion and keeps the initial state when the liquid metal is flowed into the cavity of micro-gear and passes through parts of gear plate by the effect of inertia. Liquid metal is anti-filled into the tooth parts outside gear by impacting posterior of cavity, resulting in the second pressure head. Many micro-bubbles are created after the gas in the cavity is mixed and cut by high-speed movement of the metal liquid, and then brought into the mainstream areas and excluded from the exhaust ports.
Key words: ZnAl alloy; micro gear casting; numerical simulation; filling process
