基于优劣解距离法?灰色关联分析的注射成型质量多目标优化

为提高座厕椅面板注射成型质量，将优劣解距离法（TOPSIS）与灰色关联分析相结合，提出了基于TOPSIS的灰色关联综合评价模型。首先，优化并确定了塑件浇注系统，然后进行正交试验设计，选择模具温度、熔体温度，注射时间、保压压力、保压时间为试验因素，以翘曲变形量、缩痕指数、体积收缩率为评价指标，运用Moldflow软件进行模拟分析；根据正交试验数据，利用基于指标相关性的指标权重确定（CRITIC）法确定了各评价指标权重系数，采用基于TOPSIS的灰色关联综合评价方法，将多目标优化转化为单目标优化问题，获得了塑件的最佳注塑工艺参数组合。结果表明，优化后的塑件体积收缩率降低14.6 %、缩痕指数降低43.3 %，翘曲变形量与优化前基本一致，塑件综合质量显著提高。

Multi-objective optimization of injection molding quality based on TOPSIS-grey relational analysis

To improve the injection molding quality of a commode chair panel,a grey relational comprehensive evaluation model based on the TOPSIS was proposed by combining the TOPSIS with a grey relational analysis.The gating system of a plastic part was first optimized and determined,and then the orthogonal experimental design was carried out.The mold temperature,melt temperature,injection time,holding pressure and holding time were selected as experimental factors to simulate and analyze the warpage,shrinkage index and volume shrinkage of the plastic part as evaluation indexes using the Moldflow software.According to the orthogonal test data,the weight coefficients of each evaluation index were determined using the CRITIC method,and the multi-objective optimization was transformed into the single objective one using a grey relational comprehensive evaluation method based on the TOPSIS to obtain an optimal combination of process parameters.The experimental results indicated that the volume shrinkage of the plastic part after optimization was reduced by 14.6%,its shrinkage mark index was reduced by 43.3%.The warpage deformation was basically the same as that before optimization,and the overall quality of the plastic part was improved significantly.