塑料接线盒的型腔残余应力正交优化

Optimization of Residual Stress in Cavity of Plastic Junction Box Based on Orthogonal Test

由于塑料接线盒结构比较复杂,面上和侧边有多个小孔,对于注塑成型时熔体流动的阻碍改向较多,易产生较大的型腔内残余应力,影响塑件强度。笔者设计了正交试验方案列表,并对每个方案组合进行了Moldflow分析,研究了模具温度、注射时间、保压时间、冷却时间、熔体温度和保压压力6个参数对型腔残余应力的影响,找到了不同因素的影响力大小,合理进行了工艺参数组合的优化,找到了残余应力最小时的最佳工艺参数组合。试验结果表明:正交试验可以针对试验指标结果进行某一注塑参数的精准优化,避免大量无序摸索,节省了注塑企业的时间和材料成本。

The structure of the plastic junction box was complex with many small holes on the sides. There were many hindrances to the melt flow during injection molding. It was easy to produce larger cavity residual stress affecting the strength of plastic parts. The list of scientific orthogonal test plans was designed. And each scheme combination was analyzed by Moldflow. The influences of mold temperature,injection time,holding time,cooling time,melt temperature and holding pressure on the variation of residual stress in cavity were studied. The influences of different factors were found. The combination of process parameters was reasonable optimized. The best technology parameters of minimum residual stress were found. The test results show that the orthogonal test can be used to optimize the injection parameters accurately according to the test index,avoid a large number of random exploration and save time and material cost of injection enterprises.