摘要
针对制品的翘曲、收缩、缩痕等多个质量指标要求,提出层次分析法和灰色关联分析法相结合的注射成型工艺优化方法。运用层次分析法,对3个质量指标进行综合评判,得到各自的权重。通过田口正交试验设计和Moldflow成型模拟,得到了各质量指标的预测值,计算试验序列的各质量指标的灰色关联系数,进而通过层次分析法(AHP)和灰色关联分析(GRA)综合评价模型,得出各试验序列的灰色关联度,并进行均值分析。结果表明,二段保压压力对综合的质量指标影响最显著,注射时间次之;最优的成型工艺参数是注射时间为1.2s、一段保压120 MPa、二段保压120 MPa、三段保压80 MPa;手机壳体实例验证了方法的有效性。
A multi-objective optimization method was proposed through the combination of analytic hierarchy process (AHP) and grey relation analysis (GRA) applying to multiple quality indexes, such as warp, volume shrinkage ratio, and sink index. The normalized weighting value of three quality index was obtained by means of analytic hierarchy process. Injection molding process was simulated by using Moldflow and orthogonal experiment design, and the predicted value of each quality index was obtained. The grey relational coefficient of experiment sequence and each quality index was calculated, and then the grey relational grade was obtained by means of a comprehensive evaluation model which combined the analytic hierarchy process (AHP) with gray relational analysis (GRA) methods, the analysis of means was executed afterwards. Holding pressure of second stage was best significantly effective on the comprehensive quality index, followed by injection time. The optimal process parameters combination of the injection molding was injection time(1.2 s), holding pressure of first stage (120 MPa), holding pressure of second stage (t20 MPa), holding pressure of third stage(80 MPa). The feasibility of the proposed method was demonstrated by the project of mobile phone shell.
出处
《中国塑料》
CAS
CSCD
北大核心
2015年第7期80-85,共6页
China Plastics
关键词
注射成型
层次分析法
灰色关联分析
injection molding
analYtic hierarchy process
gray relational analysis