基于改进TOPSIS-灰色关联分析的QSn7-0.2锡青铜变薄拉深多目标优化

Multi-objective optimization on ironing of QSn7-0.2 tin bronze based on improved TOPSIS-grey correlation analysis

为提高QSn7-0.2锡青铜连杆衬套变薄拉深成形质量、实现降本增效,将优劣解距离法(TOPSIS)与灰色关联分析法相结合,提出一种改进TOPSIS-灰色关联分析多目标评价体系,以QSn7-0.2锡青铜连杆衬套为研究对象,选定变薄率、凹模锥角、拉深速度、摩擦因数为工艺因素变量,设计4因素5水平正交试验,并在ABAQUS软件中进行变薄拉深工艺数值模拟分析。以成形件屈服强度、抗拉强度、残余应力、拉深力为综合优化目标,利用CRITIC法对多个优化目标权重进行客观赋值,将多目标优化问题转换为单目标优化问题,最终获得QSn7-0.2锡青铜变薄拉深最优工艺参数组合为:变薄率为42%、凹模锥角为9°、拉深速度为16mm·s^(-1)、摩擦因数为0.15。最优工艺参数组合下工件的屈服强度为587MPa、抗拉强度为643MPa、残余应力为173MPa、拉深力为626k N,成形质量更优更均衡。

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