脉冲电流频率对电磁成形板料变形高度的影响

Effect of Impulse Current Frequency on Sheet Metal Deformation Height in Electromagnetic Forming

用ANSYS/LS-DYNA对平板件电磁成形进行了有限元分析,其中成形载荷简化为正弦载荷,载荷沿板料径向也是正弦变化。在载荷幅值相同的情况下,对各向同性薄板材料进行了不同加载时间的分析,结果表明:随加载时间的增大,板料的最大变形高度先是增大,然后减小,当加载时间增大到一定程度时,板料的最终变形程度差别不大。通过推导加载时间与脉冲电流频率的关系,得出了脉冲电流频率对板料变形高度的影响:随脉冲电流频率的减小,板料的最大变形高度先是增大,然后减小,当脉冲电流频率减小到一定程度时,板料的最终变形程度差别不大。

Using ANSYS/LS-DYNA program, the authors analyzed sheet metal electromagnetic forming with the finite element method (FEM), wherein the forming pressure was simplified as sinusoidal pressure, and the pressure along the radial of the sheet metal also changed sinusoidally. Some analysis of the deformation of the isotropic thin sheet under the condition of same pressure amplitude but different loading time was made. The results show that as the loading time increases, the final deformation of the sheet increases first, then decreases, and when the loading time increases to some value, the final deformation of the sheet has little difference. Through studying the relation between loading time and impulse current frequency, the effect of the impulse current frequency on sheet metal deformation height has been achieved: as the frequency decreases, the final deformation of the sheet increases first, then decreases, and when the frequency decreases to a certain value, the final deformation of the sheet has almost no difference.