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以某一电工仪表外壳为研究对象,模具温度、熔体温度、充填时间和保压压力4个注塑工艺参数为优化目标,制品残余应力和体积收缩率为试验目标函数,采用响应面法(RSM)进行试验设计。所得最优工艺参数优化组合为:模具温度80℃、熔体温度285℃、充填时间1.8 s、保压压力89.18 MPa。经Moldflow模拟,得到最大残余应力与最大体积收缩率分别为54.83 MPa和3.395 4%,这表明响应面模型对工艺参数具有很好的优化效果。以此工艺参数组合为基础,进一步对保压曲线进行优化,得到了近乎最小的残余应力和体积收缩率,从而保证了产品质量,提高了生产效率。
Taking an electric instrument case as the research object, four injection molding process parameters of mold temperature, melt temperature, filling time and packing pressure were optimized. The residual stress and volume shrinkage of the product were the objective function of the experiment. Response surface methodology (RSM ) For experimental design. The optimal combination of the optimum process parameters: mold temperature 80 ℃, melt temperature 285 ℃, filling time 1.8 s, holding pressure 89.18 MPa. After Moldflow simulation, the maximum residual stress and the maximum volume shrinkage were 54.83 MPa and 3.395 4%, respectively, indicating that the response surface model has a good optimization effect on process parameters. Based on the combination of process parameters, the packing curve is further optimized to obtain the minimum residual stress and volume shrinkage, so as to ensure the product quality and improve the production efficiency.