汽车侧裙板的热流道大型注塑模具设计

根据汽车侧裙板的结构特征、材料特征、塑件外观质量与批量要求等，设计了一副热流道转普通流道的大型复杂注塑模具；经过详细的模流分析，确定了热流道5点进胶的最佳浇注系统方案，进胶顺序由顺序阀根据成型塑件质量情况进行调节；模具侧向抽芯机构复杂，温度控制系统均衡高效，导向定位系统精确可靠。结果表明，模具结构先进合理，自投产以来，运行安全平稳，成型周期控制在75 s之内，塑件尺寸精度达到MT4。

Design of Large Injection Molds with Hot Runners for Automobile Side Aprons

According to the structural characteristics, material characteristics and plastic appearance quality of an automobile side apron as well as the requirements for batch production, a large complex injection mould with a hot-runner-plus-common-runner structure was designed. An optimal design proposal for gating system was determined as a 5-point hot runner feed system through a careful mold flow analysis, and the feed sequence was adjusted by the sequence valve according to the quality of molded parts. It was confirmed that the side core pulling mechanism of the die was complicated, the temperature control system was balanced and efficient, and the guide positioning system was accurate and reliable. The results indicated that the molding cycle could be controlled within 75 s and the dimensional accuracy of plastic parts achieved MT4 thanks to the advanced design and reasonable structure for the mould developed by this work. The mould was kept a stable operation since the formal production.