Lorentz-force-driven (LFD) stamping process is effective in formability enhancement and shape controlling in deep cup drawing. In this paper, LFD process was proposed for small-sized hole-flanging. A series of LFD flanging experiments under different diameters of pre-fabricated hole were carried out, and conventional flanging was implemented for comparison. Defect-free case with smaller prefabricated hole confirmed the potential of the LFD process in reaching higher flanged wall without fracture. Punch velocity captured during experiments reached the maximum value of around 10 m/s for both cases, four defect-free cases and the case of φ = 8.75 mm. A numerical model was established to investigate the deformation behavior and geometrical parameters during LFD flanging. Simulation results showed that excessive radial tensile strain in punch side led to the exceptional increase in thickness strain and thinning at the fillet. In addition, greater effective plastic strain along punch side elements resulted in higher hardening level than that in die side. Furthermore, bending moments would be generated when work-piece contacted with tools fillet, which formed the curved profile in die side and straight profile in flanged wall of punch side. More importantly, edge material attached to punch sidewall when slid through it and the diameter of straight profile there was totally controlled by the punch parameter.

洛伦兹力驱动（LFD）冲压工艺可有效地提高深冲杯中的成形性和形状控制。在本文中，提出了用于小尺寸孔翻边的LFD工艺。在不同直径的预制孔上进行了一系列LFD翻边实验，并进行了常规翻边的比较。预制孔较小的无缺陷情况证实了LFD工艺可达到更高的法兰壁而不破裂的潜力。在两种情况下，在四个无缺陷情况下和在φ= 8.75 mm情况下，实验期间捕获的冲头速度均达到约10 m / s的最大值。建立了数值模型以研究LFD翻边过程中的变形行为和几何参数。仿真结果表明，冲头侧的径向拉伸应变过大，会导致厚度应变异常增加，并且圆角处变薄。另外，沿冲头侧元件的更大有效塑性应变导致比模具侧更高的硬化水平。此外，当工件与工具圆角接触时会产生弯矩，从而在模具侧形成弯曲轮廓，在冲头的凸缘壁上形成直轮廓。更重要的是，滑入冲孔侧壁时附着在冲孔侧壁上的边缘材料和笔直轮廓的直径完全由冲孔参数控制。此外，当工件与工具圆角接触时会产生弯矩，从而在模具侧形成弯曲轮廓，在冲头的凸缘壁上形成直轮廓。更重要的是，滑入冲孔侧壁时附着在冲孔侧壁上的边缘材料和笔直轮廓的直径完全由冲孔参数控制。此外，当工件与工具圆角接触时会产生弯矩，从而在模具侧形成弯曲轮廓，在冲头的凸缘壁形成直轮廓。更重要的是，当边缘材料滑过冲头侧壁时，其边缘材料和直型材的直径完全由冲头参数控制。