(1. 湖南大學(xué) 汽車車身先進(jìn)設(shè)計與制造國家重點實驗室，長沙 410082；
2. 湖南大學(xué) 機(jī)械與運載工程學(xué)院，長沙 410082；
3. 中南林業(yè)科技大學(xué) 機(jī)電工程學(xué)院，長沙 410004)
摘 要: 采用壓鑄制備薄壁AlSi10MnMg鋁合金鑄件，用高速攝像技術(shù)記錄分析壓鑄壓射沖頭的運動規(guī)律，并通過熱平衡方程求解充型過程中鑄件熔體和鑄型之間的換熱系數(shù)，最后通過數(shù)值模擬的方法討論采用不同換熱系數(shù)對充型仿真結(jié)果的影響。結(jié)果表明：充型流動長度隨澆注溫度的升高而增長；當(dāng)充型處于液相線溫度之上時，充型時間、換熱系數(shù)隨澆注溫度的升高而增長；當(dāng)充型至溫度處于液相線溫度以下時，充型時間和換熱系數(shù)變化都很小。模擬仿真結(jié)果顯示，采用基于熱平衡方程求得的換熱系數(shù)的計算模擬仿真結(jié)果與實驗結(jié)果較一致。
關(guān)鍵字: 薄壁鋁合金；壓鑄；充型；換熱系數(shù)；模擬仿真
（1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,
Hunan University, Changsha 410082, China;
2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;
3. College of Mechanical and Electrical Engineering,
Central South University of Forestry and Technology, Changsha 410004, China）
Abstract:The thin-wall AlSi10MnMg aluminum alloy samples were prepared by high pressure die casting. The motion laws of press-shoot ram were recorded by a high speed camera system and the heat transfer coefficients between the casting and mold were calculated by the energy conservation equation. Therefore, the effects of different heat transfer coefficients on the simulated filling results were discussed. The results show that the filling fluidity length increases with the pouring temperature increasing; when the filling process is above the liquidus, the filling time and the heat transfer coefficient increase with the pouring temperature increasing. However, when the filling process is below the liquidus, the changes of the filling time and the heat transfer coefficient are insignificant. The simulations using the heat transfer coefficient which is calculated by the energy conservation equation are well consistent with the experimental results.
Key words: thin-wall aluminum alloy; high pressure die casting; filling process; heat transfer coefficient; simulation
