(吉林大学 材料科学与工程学院，汽车材料教育部重点实验室，长春 130022)
摘 要: 为研究半固态浆料触变注射成形过程中，料筒温度、注射速度、模具温度以及螺杆转速对半固态合金产品的质量和性能的影响，利用拟合的初始粘度和极限剪切粘度关系式，基于Carreau粘度模型，模拟了不同工艺条件下的半固态AZ91D镁合金触变注射成形过程。结果表明，料筒温度和螺杆转速可以影响浆料的粘度并对后续成形过程中的其它参数产生影响。而注射速度主要对喷嘴和浇口的剪切作用有影响，模具温度对实验结果影响不大。通过对模拟实验结果的分析，优化的工艺参数条件下，浆料的充型过程平稳、顺利、完全充型，结果参数变化较大部位均集中在浇口部位，壳体部位各结果参数变化较小，且分布均匀。
关键字: 半固态；AZ91D；触变注射；数值模拟；参数优化
（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
