铝合金板材电磁脉冲包边成形工艺的数值模拟  

Numerical simulation of electromagnetic pulse hemming process for aluminum alloy sheet

作　　者：张润凯 朱卫东 翟月雯 陆辛 郝建强 Zhang Runkai;Zhu Weidong;Zhai Yuewen;Lu Xin;Hao Jianqiang(Beijing Research Institute of Mechanical&Electrical Technology Ltd.,Beijing 100083,China;Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]北京机电研究所有限公司,北京100083 [2]天津理工大学材料科学与工程学院,天津300384

出　　处：《锻压技术》2020年第8期117-126,共10页Forging & Stamping Technology

基　　金：国家科技重大专项(2018ZX04044-001)。

摘　　要：为了探讨基于电磁脉冲成形(EMF)的铝合金包边工艺的可行性,通过数值模拟研究了在不同的翻边长度、磁脉冲放电电压、线圈与板材之间距离的条件下,6014-T4铝合金板材的电磁力分布、磁感应强度以及弯曲变形规律。最后,通过实验对数值模拟结果的准确性进行了验证。实验结果表明:翻边长度越大、磁脉冲放电电压越大、线圈与板材之间的距离越短,铝板获得的磁脉冲驱动力越大,铝板弯曲变形程度越大;当磁脉冲放电电压低于2.0 k V时,铝板预包边角度不足,而当磁脉冲放电电压过高时,铝板与预包边凸模碰撞而引起回弹,说明电磁脉冲放电能量必须与预包边凸模角度相匹配。In order to explore the feasibility of aluminum alloy hemming process based on electromagnetic forming( EMF),the electromagnetic force distribution,the magnetic induction strength and the bending deformation law of 6014-T4 aluminum alloy sheet under different flanging lengths,different magnetic pulse discharge voltages and different distances between coil and sheet were studied by numerical simulation,and the accuracy of the numerical simulation results were verified by experiments.The study results show that the longer the flanging length is,the greater the magnetic pulse discharge voltage is,the shorter the distance between coil and sheet is,the greater the magnetic pulse driving force obtained by the aluminum sheet is,and the greater the bending deformation of aluminum sheet is.When the magnetic pulse discharge voltage is lower than 2 kV,the pre-hemming angle of aluminum sheet is insufficient,and while the magnetic pulse discharge voltage is too high,the aluminum sheet collides with the pre-hemming punch to cause springback.Thus,it is indicates that the energy of electromagnetic pulse discharge must match the angle of pre-hemming punch.

关 键 词：电磁脉冲成形 铝合金 包边工艺 磁脉冲放电电压 数值模拟 

分 类 号：TG391[金属学及工艺—金属压力加工]