汽车仪表板下本体的大型注塑模具设计

Design of Large Injection Mould for Automobile Instrument Panel Lower Body

针对汽车仪表板下本体塑件产品的结构特点和技术要求,设计了一副带有顺序阀控制热流道系统的大型注塑模具。设计了模具的浇注系统,通过CAE分析验证了浇注系统设计的合理性,同时发现了产品成型时可能出现的缺陷;在产品宽度一侧设计了油缸与滑块组合的侧向抽芯机构,实际抽芯距离达到120 mm;在产品长度一侧设计了双斜导柱抽芯机构,抽芯距离为70 mm,同时在该机构的滑块内部设计了3组斜顶与10组直顶系统的机构,成功解决了因塑件侧向倒扣多导致脱模困难的问题,另外在该组滑块的成型部位镶拼了铍铜,提高散热效果;采用了“斜顶块+直顶块+顶杆+顶管”的组合推出机构;通过采用直通式水管+隔片式水井,组合成类似“随形水路”的冷却系统,使模具成型周期缩短了8%。模具一次试模成功,产品符合要求,说明模具结构合理,具有创新性。

According to the structural characteristics and technical requirements of the plastic part of the lower body of the automobile instrument panel,a large injection mould with the hot runner system controlled by the sequence valve was designed.The gating system of the mould was designed,through CAE analysis,the design rationality of the gating system was verified and the possible defects in product forming were found.The side core pulling mechanism with the combination of oil cylinder and slider was designed on the width side of the plastic part,and the actual core pulling distance was 120 mm;on the length side of the plastic part,a double inclined guide pillar core pulling mechanism was designed,and the core pulling distance was 70 mm.At the same time,three groups of inclined ejector and ten groups of straight ejector systems were designed inside the slider of the double inclined guide pillar core pulling mechanism,which successfully solved the problems of difficult demoulding caused by too many lateral buckles of the plastic parts,moreover,beryllium copper was embedded in the forming part of this group of slider to improve the heat dissipation effect.The combined ejection mechanism of"inclined ejector block+straight ejector block+ejector pin+ejector pipe"was adopted,the cooling system similar to"conformal waterway"was combined by using straight-through water pipe and spacer water well,and the mould forming cycle was reduced by 8%.The success of mould test in one time makes the plastic part meet the requirements and shows that the mould structure is reasonable and innovative.