厚透光灯片多次包胶注塑工艺与模具设计

探讨了大厚度注塑件的堆积注塑成型和多次包胶注塑成型工艺,结合聚甲基丙烯酸甲酯(PMMA)材料性能,拟定车灯透光片采用一次注塑、二次包胶的注塑成型工艺;并完成了带二套独立热流道系统、含3个热流道喷嘴、由具有旋转分度功能的顶出旋转机构组成、具有六工位的注塑模具设计。使用效果表明:采用多次包胶注塑成型工艺,可有效实现对外观质量要求较高、厚度大、成型时间长,用普通模具成型工艺难以完成的注塑产品的成型。

Multiple Overmolding Forming Process and Mold Design of Thick Light-transmitting Slice

The stacked forming process and the multiple overmolding forming process of the large thickness injection mold is discussed in detail. The motor-lamp light-transmitting slice was equipped with the one-molding or overmolding forming process,combined with the material performance of PMMA. The injection mold design containing two separate heat runner systems, three hot runner spray nozzles,six-station and composed with ejection rotary mechanism with rotation dividing function was completed. It was proved that the multiple overmolding forming process was an effective method to realize molding with high appearance quality demand, thick thickness and long molding time, which was difficult to finish by the general forming process.