Study of Magnetic Force Distribution for Electromagnetic V-shape Bending Forming of Small Size Flat Sheet  

作　　者：Xiao-Wei Chen Wen-Ping Wang Min Wan Long Pan An-Lin Long Wei-Ren Xiong Cheng-Long Shi Zhong-Yu Zhou 

机构地区：[1]School of Mechanical Engineering and Automation,Beihang University [2]Institute of Physics,Chinese Academy of Sciences [3]Wuhan National High Magnetic Field Center,Huazhong University of Science and Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2014年第1期25-31,共7页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Basic Research Program of China(Grant No.2011CB012800 and 2011CB012804)

摘　　要：Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS / EMAG. Series of electromagnetic V-shape bending forming experiments are presented,in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet,and the coil is susceptible to failure such as bulging,ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes,the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case,magnetic force distribution can be adjusted through the change of the relative position between coil and sheet,the desired deformation can be obtained finally. Therefore,big size round flat spiral coil can be well applied to electromagnetic V-shape bending forming of small size flat sheet.Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS/EMAG. Series of electromagnetic V-shape bending forming experiments are presented, in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet, and the coil is susceptible to failure such as bulging, ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes, the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case, magnetic force distribution can be adjusted through the change of the relative position between coil and sheet, the desired deformation can be obtained finally. Therefore, big size round flat spiral coil can be well applied to electromagnetic V-shape bendin~ formin~ of small size flat sheet_

关 键 词：Electromagnetic forming Small size sheet blank Induced current crowding effect Magnetic force distribution 

分 类 号：TG391[金属学及工艺—金属压力加工]