矩形铝型材柔性三维拉弯工艺的多目标优化  

Multi-Objective Optimization of Flexible Three-Dimensional Stretch Bending Forming Process of Rectangular Hollow Aluminum Profiles

作　　者：梁继才[1] 滕菲[1] 高嵩[1] 陈广义[1] 魏志勇[1] 

机构地区：[1]大连理工大学汽车工程学院∥工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《华南理工大学学报（自然科学版）》2013年第9期143-148,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家工信部重点产业振兴和技术改造专项(吉工信投资[2011]350)

摘　　要：对矩形铝型材的三维拉弯工艺进行研究,提出了一种适用于三维拉弯、具有可重构性的柔性拉弯模具设计方法.通过在矩形型材内填充钢块来抑制截面凹陷,并以减小型材回弹前后对应节点的位移偏差和截面凹陷为优化目标,建立了矩形型材柔性三维拉弯成形工艺的多目标优化模型.采用拉丁超立方抽样和响应面法建立优化的代理模型,结合非支配遗传算法进行多目标优化全局求解.有限元模拟和实验结果表明:柔性模具可以较好地完成三维拉弯;填充钢块的方法可以有效地抑制截面凹陷,优化后的预拉量和补拉量的组合可以较好地同时控制回弹和截面凹陷,使之同时达到允许范围.This paper deals with the three-dimensional stretch-bending forming process of rectangular hollow aluminum profiles,and devises a die design method for the reconfigurable flexible three-dimensional stretch bending.Then,a method of filling blocks of steel into the profiles is proposed to suppress sagging,and a multi-objective optimization model of the forming process is constructed with a springback function and a sagging function as the multi-objective function.Finally,an optimized agent model is constructed by using the Latin hypercube sampling and the response surface method,and the multi-objective optimization of the global solution is carried out by combining the non-dominated sorting genetic algorithm.The results of both the finite element simulation and the experiments show that （1） the flexible die can achieve a better three-dimensional stretch bending ; （2） the method of filling blocks of steel can effectively suppress sagging ; and （3） an optimized combination of pre-stretch and poststretch can significantly reduce the springback and the sagging,thus,enabling both to reach the allowable range at the same time.

关 键 词：矩形铝型材 三维拉弯 多目标优化 遗传算法 回弹 

分 类 号：TG386[金属学及工艺—金属压力加工]