基于Moldflow和响应曲面法的LGFRPP注塑工艺参数优化

Optimization of LGFRPP Injection Molding Process Parameters Based on Moldflow and Response Surface Method

基于Moldflow对长纤维增强聚丙烯注射成型充填过程进行模拟仿真分析,提出一种注射成型工艺参数优化方法。分析了注射成型工艺参数对纤维长度的影响,设计了以最短纤维长度为优化目标的二阶多项式模型,建立了以模具温度、熔体温度、充填时间为试验因子的响应曲面模型。通过计算响应曲面模型,分析3种工艺参数对物料剪切作用的影响,得到最短纤维长度在模具温度为80℃、熔体温度为240~250℃、充填时间为0.8~1 s区间可取得最大值;结合不同工艺参数交互影响的响应曲面,分析得到最优工艺参数组合为模具温度为80℃、熔体温度为247.5℃、充填时间为0.91 s。将最优工艺参数组合代入二阶多项式模型和Moldflow仿真模型,得到最短纤维长度预测值2.444 3 mm和最短纤维长度模拟值2.477 mm,相对误差为1.32%。

A simulation analysis of the injection molding filling process of long fiber-reinforced polypropylene based on Moldflow was carried out,and an optimization method of injection molding process parameters was proposed.The effect of injection molding process parameters on fiber length was analyzed,a second-order polynomial model with the shortest fiber length as the optimization target was designed,and a response surface model with mold temperature,melt temperature and filling time as test factors was established.By calculating the response surface model,the influence of three process parameters on material shearing was analyzed,and the maximum value of the shortest fiber length was obtained in the interval of mold temperature of 80 ℃,melt temperature of 240~250 ℃,and filling time of 0.8~1 s.Combining the response surfaces of the interaction effects of different process parameters,the optimal process parameters were obtained with the mold temperature of 80 ℃,melt temperature of by substituting the optimal process parameters into the second-order polynomial model and Moldflow simulation model,the predicted value of the shortest fiber length of 2.444 3 mm and the simulated value of the shortest fiber length of 2.477 mm were obtained,with a relative error of 1.32%.