汽车保险杠模具结构设计  

Automobile Bumper Mould Structure Design

作　　者：植才华 Zhi Caihua(Zhaoqing Technician College,Zhaoqing 526060,China)

机构地区：[1]肇庆市技师学院,广东肇庆526060

出　　处：《工程塑料应用》2022年第8期97-102,共6页Engineering Plastics Application

摘　　要：针对汽车保险杠尺寸较大、结构呈拱形,为降低模具成本,动模型芯采用拼接结构,并将型芯中间的镶件垫高。为保证定模板的强度,定模采用整体结构,并在分型面上设计枕位,由枕位连接定模板两端,可有效防止定模变形。为了保证产品的注塑质量,采用直喷嘴+顺序喷嘴的多个热流道浇注。为了方便修剪水口料,将直喷嘴附近的产品浇口位设计成凹坑结构。为了防止直喷嘴里温度较低的材料进入型腔,在直喷嘴对应浇注位的内表面设计圆柱,当作冷料井。针对产品两端的扣边,根据聚丙烯料弹性较大的特性,在定、动模分模后,用滑块将产品的两端往两边拉开,使扣边脱离动模型芯底部后,再将产品顶出。通过采用“集水块+直通式+水井式”的冷却水温度控制系统,可使模具温度保持均匀。采用油缸带动顶出系统脱模,可以使顶出系统运动平衡。经生产验证,该模具结构合理,脱模动作简单,注塑产品形状稳定。In view of the large size and arched structure of the automobile bumper,in order to reduce the mold cost,the moving model core adopted the splicing structure,and the insert in the middle of the core was padded up.In order to ensure the strength of the fixed template,the whole structure of the fixed template was adopted,and the pillow position was designed on the parting surface.The pillow position connected the two ends of the fixed template,which can effectively prevent the deformation of the fixed template.In order to ensure the quality of injection molding,multiple hot flow channels of straight nozzles and sequential nozzles were used.In order to facilitate the cutting of the nozzle material,the product near the straight nozzle was designed as a concave structure.In order to prevent the low temperature material in the straight nozzle from entering the cavity,a cylinder was designed on the inner surface of the straight nozzle corresponding to the glue position as a cold material well.For the buttoning edges at both ends of the product,according to the characteristics of modified polypropylene material flexibility,after the fixed and moving die parting,with a slider to pull the two ends of the product to both sides,so that the buckle from the bottom of the moving model core,then take out the product.The mould temperature can be kept uniform by adopting the cooling water temperature control system of"water collecting block+straight-through type+well type".The ejecting system can be balanced by using the oil cylinder to drive the ejecting system.Through production verification,the mould structure is reasonable,the demoulding action is simple,and the shape of injection products is stable.

关 键 词：汽车保险杠 塑料模具 热流道 扣边 聚丙烯 

分 类 号：TQ320.63[化学工程—合成树脂塑料工业]