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Improvement of circular hole flanging height using multi-directional electromagnetic flanging

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Abstract

Hole flanging is a forming method used to produce local features on metal sheets. In traditional stamping, the diameter of prefabricated hole should be reduced to improve flanging height. But when the prefabricated hole is too small, the flanging hole is prone to crack in the forming process. Electromagnetic forming (EMF) is a high-speed forming method based on pulsed magnetic forces, which can significantly improve the forming limit of materials. In order to improve the flanging height and forming accuracy, a composite forming method is proposed, which combines multi-directional electromagnetic flanging (MDEMF) and shaping process by punch. The material flow in the blank holder area is promoted by radial electromagnetic force, and the flanging height is increased. The effects of coil current direction and discharge voltage on the magnetic field are investigated. If the current flows in the same direction, a larger magnetic force can be generated on the sheet. The higher the discharge voltage, the better the material flow in the sheet flange. Then shaping process by punch was used to ensure the forming accuracy of flanged parts. In the same initial hole diameter conditions, the forming height achieved by MDEMF + shaping process was improved by 89.5% compared to that by traditional stamping.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant Number: 51775563) and the Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University (ZZYJKT2020-02).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Ziqin Yan, Xiaohui Cui, Ang Xiao & Dongyang Qiu

  2. Light Alloy Research Institute, Central South University, Changsha, 410083, China

    Xiaohui Cui & Jiajia Ding

  3. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, People’s Republic of China

    Xiaohui Cui

Authors
  1. Ziqin Yan
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  2. Xiaohui Cui
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  3. Ang Xiao
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  4. Jiajia Ding
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  5. Dongyang Qiu
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Contributions

Ziqin Yan contributed to methodology, investigation, simulation, experiments, and writing original draft. Xiaohui Cui contributed to methodology, investigation, and writing—review and editing. Ang Xiao collected data and performed investigation. Jiajia Ding performed investigation. Dongyang Qiu contributed to experiments.

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Correspondence to Xiaohui Cui.

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Yan, Z., Cui, X., Xiao, A. et al. Improvement of circular hole flanging height using multi-directional electromagnetic flanging. Int J Adv Manuf Technol 122, 1281–1292 (2022). https://doi.org/10.1007/s00170-022-09971-x

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  • DOI: https://doi.org/10.1007/s00170-022-09971-x

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