Electromagnetic Forming of Sheet Metals

Electromagnetic forming is a high-speed metalworking process that employs pulsed magnetic fields to induce eddy currents in conductive sheets, generating Lorentz forces that plastically deform the workpiece without mechanical contact. This technique enables extreme strain rates, often exceeding 10^3 s^−1, which can enhance formability, refine microstructure and suppress springback compared with quasi-static methods. Typical applications include embossing, tube bulging, trimming and complex three-dimensional shaping of aluminium, steel and copper alloys. Coil design, discharge circuitry and pulse shaping are critical to controlling force distribution, deformation uniformity and thermal effects in the tooling. Recent advances have focused on optimising coil geometries, reducing coil heating, and integrating electromagnetic forming with stamping or hybrid processes. The process offers a clean, rapid and flexible route to forming lightweight sheet components for automotive, aerospace and consumer-electronics sectors, supporting global efforts to reduce energy consumption, weight and greenhouse-gas emissions.

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Electromagnetic Forming of Sheet Metals publication trend

The graph below shows the total number of articles in electromagnetic forming of sheet metals across all publications each year (not limited to Nature Index journals).

Technical terms

Electromagnetic forming: A rapid metal-forming process using pulsed magnetic fields to induce deformation without direct mechanical contact.

Eddy current: Circulating electrical currents induced in a conductor by a changing magnetic field, which interact with the field to produce force.

Lorentz force: The electromagnetic force acting on moving charges or currents in a magnetic field, driving the forming action.

Formability: The capacity of a material to undergo plastic deformation without cracking under specified forming conditions.

Springback: Elastic recovery of a part after unloading, which can reduce dimensional accuracy in forming processes.

References

1. Electromagnetic Force Distribution and Deformation Homogeneity of Electromagnetic Tube Expansion With a New Concave Coil Structure. IEEE Access (2019).
2. Electromagnetic Force Distribution and Forming Performance in Electromagnetic Forming With Discretely Driven Rings. IEEE Access (2020).
3. Coil Temperature Rise and Workpiece Forming Efficiency of Electromagnetic Forming Based on Half-Wave Current Method. IEEE Access (2020).
4. Effect of initial state on formability of AA1060 alloy under quasi-static and electromagnetic forming. Journal of Materials Research and Technology (2022).
5. Springback Reduction of L-Shaped Part Using Magnetic Pulse Forming. Metals (2020).
6. Examples of How Increased Formability through High Strain Rates Can Be Used in Electro-Hydraulic Forming and Electromagnetic Forming Industrial Applications. Journal of Manufacturing and Materials Processing (2021).