半固态AZ91D镁合金触变注射成形过程数值模拟及参数优化.pdfVIP

第l8卷第4期 中国有色金属学报 2008年4月 、b1．18 NO．4 The Chinese Journal of Nonferrous Metals Apr．2008 文章编号：1004—0609(2008)04—0703—07 半固态AZ91D镁合金触变注射成形过程 数值模拟及参数优化 张友法，刘勇兵，曹占义，张 亮，张倩倩 (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。 关键词：半固态；AZ91D；触变注射；数值模拟：参数优化 中图分类号：TG 146．2 文献标识码：A Numerical simulation and parameters optimization of thixomolded process for semisolid AZ91D magnesium ahoy ZHANG You-fa,LIU Yong-bing，CAO Zhan-yi，ZHANG Liang，ZHANG Qian-qian (Key Laboratory ofAutomobile Materials of Ministry of Education，Department of Materials ScienceEngineering， Jilin University,Changchun 1 30022，China) Abstract：To study the influence ofbarrel 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 ale influenced by the viscosity that is controlled by barrel temperature and screw rotation speed during the preparation of semisolid slurry before the injection．Howeve~the results for different injection velocities demand on the role of shear