(1. 哈爾濱工業(yè)大學(xué) 微納米技術(shù)研究中心, 哈爾濱 150001；
2. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 哈爾濱150001)
摘 要: 修正了傳統(tǒng)Navier-Stoke方程，并利用該方程和Fluent軟件對Zn-4Al合金充填微齒輪鑄件的充型過程進(jìn)行數(shù)值模擬。結(jié)果表明：在運(yùn)動慣性的作用下，Zn-4Al合金在進(jìn)入微齒輪型腔后途徑齒輪盤部位時，合金并未橫向擴(kuò)展，而是保持入射狀態(tài)首先填充對面的齒輪軸，撞擊型腔壁后，產(chǎn)生二次壓頭，然后再向齒輪外圍的各齒部位反充；型腔內(nèi)氣體被高速運(yùn)動的金屬液攪拌和切割，形成許多微氣泡，然后被帶入主流區(qū)，從排氣道排除。
關(guān)鍵字: ZnAl合金；微齒輪鑄件；數(shù)值模擬；充型過程
（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
