(吉林大學 材料科學與工程學院，汽車材料教育部重點實驗室，長春 130022)
摘 要: 為研究半固態(tài)漿料觸變注射成形過程中，料筒溫度、注射速度、模具溫度以及螺桿轉(zhuǎn)速對半固態(tài)合金產(chǎn)品的質(zhì)量和性能的影響，利用擬合的初始粘度和極限剪切粘度關(guān)系式，基于Carreau粘度模型，模擬了不同工藝條件下的半固態(tài)AZ91D鎂合金觸變注射成形過程。結(jié)果表明，料筒溫度和螺桿轉(zhuǎn)速可以影響漿料的粘度并對后續(xù)成形過程中的其它參數(shù)產(chǎn)生影響。而注射速度主要對噴嘴和澆口的剪切作用有影響，模具溫度對實驗結(jié)果影響不大。通過對模擬實驗結(jié)果的分析，優(yōu)化的工藝參數(shù)條件下，漿料的充型過程平穩(wěn)、順利、完全充型，結(jié)果參數(shù)變化較大部位均集中在澆口部位，殼體部位各結(jié)果參數(shù)變化較小，且分布均勻。
關(guān)鍵字: 半固態(tài)；AZ91D；觸變注射；數(shù)值模擬；參數(shù)優(yōu)化
（Key Laboratory of Automobile Materials of Ministry of Education, Department of Materials Science & Engineering, Jilin University, Changchun 130022, China）
Abstract:To study the influence of barrel temperature, injection velocity, mold temperature and screw rotation speed on the quality and properties of products during molding process of thixomolded semisolid slurry, based on the initial and ultimate viscosities and the Carreau viscosity model, a series of thixomolded processes for semisolid AZ91D products were simulated under different processing conditions. The results show that the key parameters of simulated results are influenced by the viscosity that is controlled by barrel temperature and screw rotation speed during the preparation of semisolid slurry before the injection. However, the results for different injection velocities demand on the role of shear process of injection nozzle and gate, while the mold temperature has a weak effect on the results. Through the analysis of simulated results, using the optimized parameters, the results of the numerical simulation of the filling process demonstrate that the cavity is filled smoothly and completely. The differences of the results are mainly located at the cold plug catcher of runner system, and the results are almost constants and the distributions are uniform at the shell.
Key words: semisolid; AZ91D; thixomolded; numerical simulation; parameter optimization
