汽车A柱上护板大型复杂内侧抽芯注塑模设计

Design of large injection mold with complex inner core pulling for door cladding under A-pillar of car

根据汽车A柱上护板的结构特点和技术要求,设计了一副薄壁大型注塑模具。模具采用热流道浇注系统,二级热射嘴由顺序阀控制进料时间,有效解决了大型薄壁塑件熔体填充困难问题;模具采用双斜推杆和导向杆斜顶内侧向抽芯机构,有效解决了大型注塑模具斜推杆弯曲和断裂问题;模具采用隔片式水井、倾斜式水管和直通式水管组合形式,这种近乎随形水路的温度控制系统,将成型周期控制在30 s以内,降低了约10%,成型塑件尺寸精度达到了MT3。

According to the structural characteristics of A-pillar guard board of a vehicle,a large injection mold was designed.The problem in the melt filling of large thin-walled plastic parts was solved by using a sequential valve gating hot runner.The bending and fracture of inclined pushrod problems were solved by using a double inclined push rod and guide rod inclined push rod lateral core-pulling mechanism.The mold was contrasted through the combination of diaphragm water wells,inclined water pipes,and straight-through water pipes.Through using such a nearly conformal waterway of temperature control system,the forming cycle was controlled within 30 s,decreasing by about 10 % in comparison to conventional molds.The molded plastic parts obtained a dimensional accuracy of MT3.