基于MPI的汽车内置储物盒注塑模具优化设计

Optimization Design of Injection Molds of Automobile Built-in Storage Boxes Based on MPI

以某汽车内置储物盒为研究对象,结合聚合物流变学的基本理论,采用Moldflow软件对汽车内置储物盒注射成型进行模流分析。针对储物盒制件在注射过程中出现的表面缩痕严重、达到顶出温度的时间长和翘曲量大等诸多缺陷,将实体模型的浇注系统和冷却系统等进行重新设计。通过对各个质量评价指标进一步分析发现,优化后储物盒制件的各种缺陷消除或减小,缩痕指数由0.638 2～4.009降低为零、零件达到顶出温度的时间由37.92～92.68 s降低到19.87～21.40 s、总翘曲量由1.166～1.782 mm降低到0.024 0～0.416 5 mm,优化效果明显。在此基础上进行汽车内置储物盒注塑模具的设计,并试模加工出了合格的制件。

In this paper,a mold flow analysis was performed for an automobile builtin storage box by Moldflow software according to the rheological principle of polymers.Aimed to the defects of the storage box occurring during the injection molding process,which included the surface sink marks,long time to reach the ejectiopm temperature and the large warpage deformation,the gating and cooling systems of the mold were redesigned.These defects were found to be eliminated or reduced through an evaluation for the quality of the injectionmolded product.The shrinkage index was reduced from 0.638 2~4.009 to 0,the time to reach the ejection temperature was reduced from 37.92~92.68 s to 19.87~21.40 s,and the total warpage deformation decreased from 1.166~1.782 mm to 0.024 0~0.416 5 mm.These results indicated a significant effect.Based on the above results,the injection mold of the automobile builtin storage box was designed and the qualified parts were produced by using this mold.