旋压法兰起皱预测

发布时间：2018-01-22 13:18

本文关键词： 法兰起皱普旋弹性应变能起皱预测　出处：《上海交通大学学报》2017年11期 　论文类型：期刊论文

【摘要】：针对金属薄板在普旋成形时易出现法兰起皱失效的问题,开展了铝合金封头普旋成形的有限元仿真及实验研究,分析旋压法兰边的弹性应变能及其增量与起皱失稳之间的关系,提出了铝合金材料的起皱判据.结果表明:在金属薄板普旋成形过程中,旋轮给坯料施加的变形力导致了法兰边的弹性应变能增加和振荡.由于弹性应变能增量幅值的增加,法兰边和旋轮作用区围成的扇形区域中出现了不稳定区域,故产生失稳起皱.基于Drucker公设提出了法兰起皱的判据,并建立了计算流程.通过普旋实验的验证可知,该判据能较准确地预测旋压成形时法兰边的起皱缺陷.
[Abstract]:In order to solve the problem of flange wrinkling failure in sheet metal forming, the finite element simulation and experimental study of aluminum alloy seal are carried out. The relationship between elastic strain energy, increment and wrinkling instability of spinning flange is analyzed, and the wrinkling criterion of aluminum alloy is put forward. The results show that: 1. The deformation force applied by the rotary wheel to the blank leads to the increase and oscillation of the elastic strain energy of the flange edge. Because of the increase of the amplitude of the elastic strain energy, the unstable region appears in the sector region surrounded by the flange edge and the rotary wheel action zone. The criterion of flange wrinkling is proposed based on Drucker postulate, and the calculation flow is established. This criterion can accurately predict the wrinkling defect of flange in spinning forming.
【作者单位】：上海交通大学上海市复杂薄板结构数字化制造重点实验室;
【基金】：国家自然科学基金项目(51375308) 国家重点基础研究发展规划(973)子课题项目(2014CB046600)资助
【分类号】：TG306
【正文快照】： 法兰起皱是金属薄板旋压成形时常见的3种失效形式之一[1-4].多年以来,众多学者对此进行了大量研究.Kobayashi[5]研究锥形件普旋时,指出法兰的失稳现象类似于拉深成形,法兰周向压应力导致了起皱的发生,并认为法兰起皱发生的分界点难以确定,有必要找到法兰起皱的判据.Hayama等[6

【相似文献】