【作者】 朱洪艳；

【导师】 朱春东；

【作者基本信息】 武汉理工大学 ， 材料加工工程， 2004， 硕士

【摘要】 本文利用Moldflow有限元分析软件模拟了薄壁件注塑成型过程，对注塑工艺参数进行了优化。 利用Moldflow软件对宽浇口平板进行了变形分析的正交试验；对潜伏式浇口的手机外壳，先进行了浇口定位分析以及流动、保压、冷却分析，优化了浇口位置和成型工艺条件，然后进行了翘曲变形分析的正交试验。翘曲变形是整个注塑成型过程的综合反映，文中的变形分析以翘曲变形量作为质量指标，采用多因素正交试验的方法进行变形分析，获得了塑料(PC／ABS)在熔料温度、模具温度、注射时间、保压压力、保压时间、冷却时间六因素三水平下成型薄壁件的翘曲变形量。通过方差分析比较了不同工艺参数对翘曲变形量的影响程度，得到了优化的工艺参数组合。 文中还以正交试验得到的最优工艺参数组合为基准，只变动其中一个工艺参数，研究了单个工艺参数对翘曲变形量和体积收缩率的影响趋势和机理。论证了正交试验方法所得到的工艺参数组合使生产的薄壳制件翘曲量最小，从而为薄壳件的注塑工艺分析和模具设计提供了一种有效减小翘曲量的方法。更多还原

【Abstract】 In this paper, the plastic injection processes of an injection-molded part with a thin shell feature have been simulated using the commercial software Moldflow. The injection molding conditions and factors have been optimized.The warpage problem of a fan-gated rectangular part is simulated using the experimental design of Taguchi method. The injection processes of a submarine-gated mobile telephone cover are simulated. First, gate location analysis, flow analysis, packing analysis and cooling analysis are performed, and the gate position and the processing parameters are optimized. Then warpage analysis is performed using the experimental design of Taguchi method. The warpage is a comprehensive reflection of the whole course of plastic injection molding. Therefore, this paper regards the degree of warpage as the quality characteristic in warpage analysis. The warpage data are obtained under different molding conditions including melt temperature, mold temperature, filling time, packing pressure, packing time and cooling time. The warpage data are also analyzed using ANOVA. The results are used to compare the significance of each factors and obtain the optimum set of factors.Furthermore, using the optimum set of effective factors obtained from the previous analysis, more simulations are carried out by changing one factor at a time and keeping the others at their optimum level, to investigate the effect of each factor on the warpage and the rate of volume shrinkage. Applying the experimental design of Taguchi is a quite effective method of deducing the optimum set of effective factors in injection molding to produce plastic parts with minimum warpage.更多还原