Ironing that achieved by reducing the clearance between forming tools have been proved to be able to generate high collar, regular geometry and good formability in conventional flanging process. In this paper, the effect of ironing on flanging characteristics during the Lorentz-force-driven (LFD) hole flanging process were investigated with the use of 5182 aluminum alloy. The ironing phenomenon in the LFD flanging process were realized by decreasing the diameter of die and keeping the punch diameter constant. To reveal the formation mechanism with or without ironing in this high-speed process, the elastoplastic finite element simulation model was established. Typical features in the final profiles, including junction ridge, spring-back, tip inclination, that determined by three critical clearance-thickness ratios (R_cc1, R_cc2 and R_cc3) were analyzed. Especially, the evolution of spring-back and tip inclination with respect to the varying clearance-thickness ratios (R_c) were discussed in details. According to three R_cc values, ironing identification and ironing extents (mix-ironing and pure-ironing) separation could be achieved at the same time. Based on the analysis of radius, wall and tip in the flanged part, a height calculation method was proposed for the replacement of simulation in flanging cases with R_c lowered than R_cc2. The comparison with experimental heights proved the feasibility of prediction formula.

通过减少成型工具之间的间隙实现的熨烫已被证明能够在传统翻边工艺中产生高领、规则的几何形状和良好的成型性。在本文中，使用 5182 铝合金研究了在洛伦兹力驱动 (LFD) 孔翻边过程中熨烫对翻边特性的影响。LFD翻边过程中的熨烫现象是通过减小模具直径和保持冲头直径不变来实现的。为揭示该高速过程中熨烫或不熨烫的形成机理，建立弹塑性有限元仿真模型。最终轮廓中的典型特征，包括连接脊、回弹、尖端倾斜度，这些特征由三个临界间隙厚度比 ( R_cc1、 R _cc2和R _cc3 ) 进行了分析。特别是，详细讨论了回弹和尖端倾斜相对于不同的间隙厚度比 ( R _c )的演变。根据三个R _cc值，可以同时实现熨烫识别和熨烫程度（混合熨烫和纯熨烫）分离。基于对翻边部分半径、壁面和尖端的分析，提出了一种高度计算方法，用于在R _c低于R _{cc2 的}翻边情况下代替模拟. 与试验高度的对比证明了预测公式的可行性。