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Controllable bulging morphology in electromagnetic tube forming via a composite shielding ring with tailored Lorentz force distribution.

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Title: Controllable bulging morphology in electromagnetic tube forming via a composite shielding ring with tailored Lorentz force distribution.
Authors: Feng, Fei1 (AUTHOR), Han, Jichen1 (AUTHOR), Du, Linfeng1,2 (AUTHOR), Li, Mengxian3,4 (AUTHOR), Tuo, Zhan3,4 (AUTHOR), Li, Xiaoxiang3,4 (AUTHOR) lixiaoxiang@hust.edu.cn
Source: International Journal of Advanced Manufacturing Technology. 2/19/2026, p2081-2099. 19p.
Subjects: Lorentz force, Electromagnetic shielding, Aluminum tubes, Deformations (Mechanics)
Abstract: The application of lightweight tubes such as aluminum and magnesium alloys is vital for weight reduction in aerospace, automotive, and energy industries. However, traditional quasi-static forming processes often cause poor fit, tearing, and surface damage. Electromagnetic tube bulging, a high-speed forming method using pulsed Lorentz force, offers flexible loading but suffers from non-uniform force distribution—stronger in the middle—leading to central ruptures. This study proposes a novel electromagnetic bulging method based on an electromagnetic shielding ring structure. Compared with the conventional single-coil electromagnetic forming method, this method introduces an electromagnetic shielding ring structure composed of a copper ring and a titanium alloy ring to regulate the distribution of the forming force field during the tube bulging process. Simulations and experiments show that the ring weakens the central magnetic field, redistributing the Lorentz force and improving deformation uniformity. At a discharge voltage of 7.5 kV, adding an electromagnetic shielding ring structure can improve the deformation uniformity of AA6061-O aluminum alloy tubes with an outer diameter of 75 mm and a thickness of 2 mm by about 2.5 times. Meanwhile, the forming height and uniformity of the tubes increased with the increase of the height ratio of the electromagnetic shielding ring to the discharge coil. This research work provides a new method for the effective regulation of Lorentz force distribution in the electromagnetic bulging process of tube bulging, which is an important inspiration for broadening the electromagnetic forming applications. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Advanced Manufacturing Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 192430974
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Controllable bulging morphology in electromagnetic tube forming via a composite shielding ring with tailored Lorentz force distribution.
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  Data: <searchLink fieldCode="AR" term="%22Feng%2C+Fei%22">Feng, Fei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Jichen%22">Han, Jichen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Du%2C+Linfeng%22">Du, Linfeng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Mengxian%22">Li, Mengxian</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tuo%2C+Zhan%22">Tuo, Zhan</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xiaoxiang%22">Li, Xiaoxiang</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<i> lixiaoxiang@hust.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Advanced+Manufacturing+Technology%22">International Journal of Advanced Manufacturing Technology</searchLink>. 2/19/2026, p2081-2099. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Lorentz+force%22">Lorentz force</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+shielding%22">Electromagnetic shielding</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+tubes%22">Aluminum tubes</searchLink><br /><searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The application of lightweight tubes such as aluminum and magnesium alloys is vital for weight reduction in aerospace, automotive, and energy industries. However, traditional quasi-static forming processes often cause poor fit, tearing, and surface damage. Electromagnetic tube bulging, a high-speed forming method using pulsed Lorentz force, offers flexible loading but suffers from non-uniform force distribution—stronger in the middle—leading to central ruptures. This study proposes a novel electromagnetic bulging method based on an electromagnetic shielding ring structure. Compared with the conventional single-coil electromagnetic forming method, this method introduces an electromagnetic shielding ring structure composed of a copper ring and a titanium alloy ring to regulate the distribution of the forming force field during the tube bulging process. Simulations and experiments show that the ring weakens the central magnetic field, redistributing the Lorentz force and improving deformation uniformity. At a discharge voltage of 7.5 kV, adding an electromagnetic shielding ring structure can improve the deformation uniformity of AA6061-O aluminum alloy tubes with an outer diameter of 75 mm and a thickness of 2 mm by about 2.5 times. Meanwhile, the forming height and uniformity of the tubes increased with the increase of the height ratio of the electromagnetic shielding ring to the discharge coil. This research work provides a new method for the effective regulation of Lorentz force distribution in the electromagnetic bulging process of tube bulging, which is an important inspiration for broadening the electromagnetic forming applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Advanced Manufacturing Technology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00170-026-17533-8
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      – Code: eng
        Text: English
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        PageCount: 19
        StartPage: 2081
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      – SubjectFull: Lorentz force
        Type: general
      – SubjectFull: Electromagnetic shielding
        Type: general
      – SubjectFull: Aluminum tubes
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      – SubjectFull: Deformations (Mechanics)
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      – TitleFull: Controllable bulging morphology in electromagnetic tube forming via a composite shielding ring with tailored Lorentz force distribution.
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            NameFull: Feng, Fei
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            NameFull: Han, Jichen
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              M: 02
              Text: 2/19/2026
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              Y: 2026
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