汽车尾门左右窗框饰板气辅注塑模具设计

Design of gas assisted injection mold construction for left and right window frame trim panels of automobile tailgate

根据汽车尾门左右窗框饰板结构特点和成型要求,设计了一副“一模两腔”带有顺序阀控制的热流道气辅注塑模具。浇注系统设计后,通过CAE模流分析对浇注系统合理性进行了验证并对成型过程中可能出现的问题进行了预测。塑件侧向区域的侧向孔、倒扣、加强筋、内表面的倒扣以及尾部的内凹特征造成脱模较为困难,所以针对侧向区域的4处侧孔和1处倒扣特征分别设计了“斜导柱+滑块”的脱模机构;针对侧向加强筋特征,设计了“液压油缸+大滑块”的脱模机构;针对尾部内凹特征,设计了“斜导柱+滑块”的脱模机构;同时针对内表面4处倒扣特征,设计了“斜顶块+斜顶杆”的脱模机构;顶出系统则是采用顶出油缸提供脱模力,带动“顶针+直顶杆+直顶块”组合参与顶出。经过实际生产验证表明:该模具结构设计合理,工作过程稳定可靠,生产出的产品满足设计要求。

According to the structural characteristics and molding requirements of the left and right window frame trim panels of an automobile tailgate,a pair of“one mold and two cavities”hot runner gas-assisted injection mold with a sequence valve control was designed.After the gating system was designed,the rationality of the gating system was verified by the CAE mold flow analysis,and the possible problems in the molding process were predicted.The lateral holes,inverted buckles,stiffeners,inverted buckles on the inner surface and concave features of the tail in the lateral area of plastic parts were more difficult for demolding.In this case,the demolding mechanism of“oblique guide column+slider”was designed for 4 side holes and 1 inverted feature in the lateral area.According to the characteristics of lateral stiffeners,the release mechanism of“hydraulic cylinder+large slider”was designed.The release mechanism of“oblique guide column slider”was also designed according to the concave feature of the tail.Meanwhile,the release mechanism of"inclined top block+inclined top bar"was designed according to the four inverted features on the inner surface.The ejection system was designed to use an ejection cylinder to provide the release force,and drives the combination of"ejector pin+straight ejector rod+straight top block"to participate in ejection.After actual production verification,the result indicated that the mold structure design was reasonable,the working process was stable and reliable,and the products could meet the design requirements.