短玻纤增强聚丙烯复合材料气体辅助注塑成型真三维模拟

True 3D Numerical Simulation of Gas-Assisted Injection of Short Fiber-Reinforced PP

基于广义非牛顿流体和七参数Cross-WLF黏度本构,以矩形平板塑件为研究对象,选用短玻璃纤维增强聚丙烯复合材料,采用Moldflow软件对传统注塑成型和气体辅助注塑成型过程进行真三维模拟,对比研究了两种成型工艺中注射压力、锁模力和塑件变形情况,结果表明,采用气辅注塑成型能有效降低注射压力和锁模力;采用气辅注塑成型能减小塑件的变形,在文中工艺条件下,传统注塑成型塑件的变形量为1.187 mm,而气辅注塑成型塑件的变形量为0.7839mm,变形缩小了51.4%,尤其是采用气辅注塑成型能明显减小塑件的收缩变形量,其收缩变形量从1.042 mm降低至0.6839 mm。

Based on generalized non-Newtonian fluid and seven parameters Cross-WLF viscosity model,the traditional injection molding and gas-assisted injection molding processing of rectangle part with short glass fiber-reinforced PP were simulated.The injection pressure,clamp force and part deflection during two different processing were investigated.The results show that injection pressure,clamp force and part deflection can be effectively decrease by gas-assisted injection molding.In the processing parameters,the total deflection of traditional injection is 1.187 mm and that of gas-assisted injection is 0.7839 mm,which decreases by 51.4%.Particularly,applied gas-assisted injection molding can reduce shrinkage deflection obviously,which decreases from 1.042 mm to 0.6839 mm.