汽车挡风玻璃装饰条对射式双色注塑模具设计

Design of Opposite-Type Bicolor Injection Mold for Automotive Windshield Decoration Strip

针对传统的动模旋转垂直转盘式双色模具结构因模具自重而产生倾斜磨耗导致模具运转不顺等问题,设计了一种水平转盘结构对射式双色注塑模具。通过分析汽车挡风玻璃装饰条的产品结构特点和成型工艺,详细设计了该产品的双色热流道塑料模具,并结合双色模具的结构特点,设计了一种斜楔弹簧侧抽芯机构,依靠斜导柱上的缺口来实现硬胶注射时不进行侧向抽芯,软胶注射完成后进行侧向抽芯动作,从而保证产品尺寸精度。最后通过在对射式注塑机上进行实际生产验证,结果表明该模具结构设计合理,能满足客户的生产工艺要求,获得较好的经济效益。

There is inclined wear occurring in the traditional movable mould with a vertically rotating bicolor injection mould structure due to the dead weight of mould, leading to the malfunction of the mould. Aiming at this problem, a horizontal rotating disk bicolor injection mould was designed. a bicolor hot runner plastic mould was designed by analyzing the structure characteristics of products and the molding process of automobile windshield decorative strip. Furthermore, a core-pulling mechanism with inclined wedge spring side was designed by combining with the structure characteristics of the bicolor mould. Such a design relied on the gap on the inclined guide pillar to realize no action of the side core-pulling for the hard rubber injection and immediate action of the side core-pulling for the soft rubber injection, and therefore the high dimension accuracy for products was ensured. Based on the practical production with this opposite-type injection mould, the structural design of this mould was reasonable to meet the requirements for production process and obtain better economic benefits accordingly.