(華南理工大學(xué) 國家金屬材料近凈成形工程技術(shù)研究中心，廣州 510641)
摘 要: 通過測量擠壓鑄造過程的溫度變化，采用基于非線性估算法的熱傳導(dǎo)有限元反算模型，求解不同擠壓力下的界面?zhèn)鳠嵯禂?shù)(IHTC)。利用鑄件中心模擬溫度與測量溫度驗證模型的準(zhǔn)確性；結(jié)合鑄件表面和中心測溫點溫度變化討論重力條件和擠壓力條件下界面?zhèn)鳠嵯禂?shù)的變化規(guī)律，發(fā)現(xiàn)擠壓力有效地增加了界面?zhèn)鳠嵯禂?shù)的峰值和穩(wěn)定值。探討擠壓力對界面氣隙的影響，對于ZL101A鋁合金直接擠壓鑄造過程，50 MPa擠壓力具有較好的擠壓效果。
關(guān)鍵字: 鋁合金；擠壓鑄造；界面?zhèn)鳠幔环此惴ǎ唤缑鏆庀?/span>
（National Engineering Research Centre of Near-net shape Forming for Metallic Materials,
South China University of Technology, Guangzhou 510641, China）
Abstract:The temperature histories throughout squeeze casting process under different applied pressures were recorded. The interfacial heat transfer coefficients (IHTCs) were calculated by using an inverse method based on the nonlinear estimation method. To validate the inverse method, the comparison between measurement and simulation temperatures in the center of castings was taken. IHTCs under gravity and pressure condition, respectively, were discussed with the surface and centre temperature histories of castings to obtain a general rule. The results show that the peak and stable values of IHTCs increase obviously with increasing the applied pressure. Additionally, the effect of applied pressure to interface air gap was discussed, and 50 MPa applied pressure performs sufficiently to direct squeeze casting process of ZL101A aluminum alloy.
Key words: aluminum alloy; squeeze casting; interfacial heat transfer; inverse method; interfacial air gap
