共注射制品芯层厚度分析的数值模拟

Numerical Simulation of Core Thickness Fraction of Molded Products in Co-Injection Molding

采用数值模拟技术对共注射成型过程进行了充填分析,从芯层材料的厚度分布以及芯层材料的穿透距离进行了研究。结合试验设计(DOE),研究了注射速率、模具温度、皮层熔体温度、芯层熔体温度和表层材料体积百分数对芯层厚度分布的影响;同时采用Fractional Factorial方法,研究工艺参数以及之间的交互作用对芯层材料穿透距离的影响度。结果表明,皮层材料注射的体积百分数对制品的芯层材料的厚度分布及芯层材料的穿透距离影响最大,其它影响因子影响较小。

Based on filling simulation in co-injection molding and design of experiment （DOE） technology, Moldflow software was used to analyze the core thickness fraction distribution and the penetration length of the core melt. Injection flow rate, mold temperature, skin temperature, core temperature and volume skin were regarded as process parameters. The fractional factorial design method was introduced to investigate the significance of process parameters, and the effect of each factor on the quality response of mold part was also studied. Co-injection molding simulation analyses show that volume skin has the great impact on core thickness fraction distribution and the penetration length of the core melt, while the influences of mold temperature and melt temperature are comparatively inappreciable.