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<p>Coil-less electromagnetic forming (CLEMF) replaces traditional coils with induction blocks, making it well suited for forming low conductivity metal plates while avoiding coil overheating, deformation, and short service life. This study examines how induction block geometry and spatial arrangement affect the electromagnetic force distribution in TC4 titanium alloy plate. The electromagnetic force field calculated using ANSYS and the three proposed geometric-physical indicators (energy rate tensor, magnetic shape tensor, and magnetic deflection tensor) are used to guide topology optimization. Based on these insights, a novel multi-ring induction block was developed and its performance evaluated through sequential simulations using ANSYS and ABAQUS. Results show that circular ring blocks with optimized inner and outer diameters generate strong and uniform forces, while multi-ring structures improve loading smoothness. The proposed design enhances force uniformity and forming quality, providing a systematic framework for induction block design in CLEMF.</p>

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The influence of induction block topology structure on force distribution in coil-less electromagnetic forming

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Xin Xu,
  • Fenqiang Li,
  • Liang Huang,
  • Qianting Wang,
  • Hui Li

摘要

Coil-less electromagnetic forming (CLEMF) replaces traditional coils with induction blocks, making it well suited for forming low conductivity metal plates while avoiding coil overheating, deformation, and short service life. This study examines how induction block geometry and spatial arrangement affect the electromagnetic force distribution in TC4 titanium alloy plate. The electromagnetic force field calculated using ANSYS and the three proposed geometric-physical indicators (energy rate tensor, magnetic shape tensor, and magnetic deflection tensor) are used to guide topology optimization. Based on these insights, a novel multi-ring induction block was developed and its performance evaluated through sequential simulations using ANSYS and ABAQUS. Results show that circular ring blocks with optimized inner and outer diameters generate strong and uniform forces, while multi-ring structures improve loading smoothness. The proposed design enhances force uniformity and forming quality, providing a systematic framework for induction block design in CLEMF.