基于Moldflow的薄壁注塑件的工艺参数的优化

Optimization of thin-wall plastics injection molding technology based on Moldflow

运用Moldflow软件分析薄壁塑件的成形工艺,并结合正交试验法,对不同工艺条件下的薄壁注塑过程进行模拟.首先以模具温度、熔体温度、注射压力及注射速率为工艺参数水平,建立正交试验表L27,获得注塑时间,再以注射时间、保压压力、保压时间及冷却时间为工艺参数,建立正交试验表L9,获得塑件成型后的体积收缩率、翘曲量两个数值,对所得到的数值运用信噪比和方差分析方法来进行处理,确定最佳成形工艺参数组合.预测最优参数组合成型所得的体积收缩率和最大翘曲值,最后通过软件模拟验证其正确性.

Thin-wall injection molding process of injected part is simulated under various technological conditions by utilizing analysis software of Moldflow and Taguchi optimization technique. Firstly, L27 orthogonal array is conducted to gain the injection time by utilizing four process parameters such as mold temperature, melt temperature,injection pressure, and material flow rate. Secondly, L9 orthogonal array is conducted to investigate the each process parameters （injection time, packing pressure, packing pressure time, cooling time） in order to get the values of warpage and shrinkage. The signal-to-noise（S/N） and the analysis of variance （ANOVA） are used to find the optimal levels and gain the best process parameters. Then the optimal value of warpage and maximal value of shrinkage can be predicted. Finally, the optimization of thin-wall plastics injection molding technology based on Moldflow is validated.