微尺度铸件充型过程的数值模拟  

Numerical simulation of filling process on casting in micro scale

作　　者：任明星[1] 李邦盛[1,2] 傅恒志[2] 

机构地区：[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

出　　处：《中国有色金属学报》2011年第7期1675-1680,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50475028);黑龙江省自然科学基金资助项目(ZJG04-01);微系统与微结构制造教育部重点实验室开放基金资助项目(HIT.KLOF.2009012)

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。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.

关 键 词：ZnAl合金 微齿轮铸件 数值模拟 充型过程 

分 类 号：TG21[金属学及工艺—铸造]