塑料黏度和制品壁厚对夹芯注射芯层穿透效果的影响研究

Research on the Influence of Plastic Viscosity and Product Thickness on Core Penetration Effect of Sandwich Injection Molding

通过Moldflow软件对桶形塑件进行了夹芯注射模拟仿真分析,研究了芯/壳层材料黏度比和制品壁厚对夹芯注射制品芯层穿透长度、芯层厚度和芯层分布均匀性的影响。结果表明,在成型工艺参数相同的情况下,随着芯/壳层黏度比的增大,芯层穿透长度比按照1.41%~1.67%的倍率对应减小,芯层厚度因子均值按照1.76%~2.28%的倍率对应增大,芯层厚度因子偏差按照1.91%~2.66%的倍率对应增大,芯层厚度分布均匀性有所下降;制品壁厚每增加1 mm,芯层穿透长度比减小1%~2%,芯层厚度因子均值增大6%左右,芯层厚度因子偏差增大10%左右。

A sandwich injection-simulation analysis was carried out for a barrel-shaped plastic part using the Moldflow software. The effects of the material viscosity ratio of core to shell and the product wall thickness on the core penetration length,core thickness,and core distribution uniformity of the sandwich injection-molded products were investigated.The results indicated that under the same molding process parameters,the core penetration length ratio decreased in a rate of 1. 41 %~1. 67 % with an increase in a viscosity ratio of core to shell. Meanwhile,the average value of the core melt thickness ratio increased at a rate of 1. 76 %~2. 28 %,and the core melt thickness ratio deviation increased at a rate of 1. 91 %~2. 66 %. As the product wall thickness increased by 1 mm,the core melt penetration length ratio decreased by 1 %~2 %,the average value of the core melt thickness ratio increased by about 6 %,and the core melt thickness ratio deviation increased by about 10 %.