High-Speed Forming of Metal Sheets by Electromagnetic Force
High-Speed Forming of Metal Sheets by Electromagnetic Force
复制标题
DOI：
10.1299/jsmec1988.31.142
复制
发表时间：
1988-03
期刊：
影响因子：
--
通讯作者：
N. Takatsu;Masana Kato;Keijin Sato;T. Tobe
中科院分区：
文献类型：
--
作者：
N. Takatsu;Masana Kato;Keijin Sato;T. Tobe
提出了一种数值模拟平板螺旋线圈电磁成形系统中夹持圆盘高速自由成形的方法。该方法结合了磁场渗透到磁盘和动态弹塑性变形的磁盘。螺旋线圈近似由同轴的圆形回路承载从电容器组的放电电流。将线圈磁场穿透圆盘的问题表示为扩散方程的边值问题。计算了圆盘内的磁场、涡流和电磁力密度。由磁场力加载的磁盘的运动方程相结合的场方程以及等效电路方程。假设为平面应力条件。考虑了应变率对圆盘材料加工硬化规律的影响。本文还介绍了退火铝圆盘自由胀形的实验，实验结果与数值解吻合较好。
A numerical method to simulate the high-speed free forming of a clamped circular disk in an electromagnetic forming system using a flat spiral coil is presented. The method combines field penetration into the disk and dynamic elasto-plastic deformation of the disk. The spiral coil is approximated by coaxial circular loops carrying the discharge current from a capacitor bank. The penetration of the magnetic field of the coil into the disk is formulated as a boundary-value problem for the diffusion equation. Magnetic field, eddy currents and electromagnetic force density in the disk are calculated. An equation of motion for the disk loaded by the magnetic force is combined with the field equation as well as an equivalent circuit equation. Plane stress condition is assumed. Strain-rate effect on the work-hardening law of the disk material is taken into account. An experiment on the free bulging of annealed aluminum disks is also presented, showing fairly good agreement with the numerical solution.