夹芯注塑成型过程的计算机可视化模拟分析——材料粘度与工艺参数对芯层熔体穿透深度的影响

Visual Computer-based Simulat ion of Sandwich Injection Molding Processing:Influences of Melt Viscosity an d Proce ss Parameter on Penetration Length of Core Melt

采用Moldflow公司MPI软件中的Co injection分析模块,对夹芯注塑成型过程进行动态模拟分析;以揭示材料粘度以及工艺参数对夹芯注塑成型过程中芯层熔体穿透深度的影响规律。结果发现,芯层熔体穿透深度值随芯/壳层熔体粘度比R值的减小而增大,这主要与芯层和壳层熔体的相对流动能力有关;此外,在工艺参数中,改变熔体注射速度对芯层熔体穿透深度的影响较为突出,而模温和熔体温度对芯层熔体穿透深度的影响相对较弱。

On the chance of und erstanding the melt flow behavior and the mechanism of sandwich inje ction molding,the dynamic simulation research on sandwich injection molding pro cess was made by employing the co-inje ction module in the software of Moldflow Pl astics Insight.The penetration length of the core melt in sandwich injection mold ing was investigated by changing the viscosities of melts and process parameter s.The results showed that the decreas e of the viscosity ratio R of core/skin melt s gave rise to enhance the penetrati on length of the core melt,owing to the rela tive fluidity of the skin and core m elts.Furthermore,the injection velocity o f the melt had greater influence on the penetration length of the core melt among t he process parameters,while the infl uences from mold temperature and melt tempe rature were comparatively inappreciable.