Abstract
While electromagnetic forming of aluminum alloy sheet has gained several advantages, the uneven radial deformation of the sheet is still one of the main drawback of this technology that calls for reliable and cost-effective solution. Aiming at this point, this paper presents an electromagnetic bulging system equipped with a new magnetic field shaper placed between the driving coil and the object sheet to modulate the distribution of the induced eddy current in the sheet, and hence regulating the distribution of the electromagnetic force to achieve more uniform deformation. A finite element electromagnetic-structure 2D coupling model simulating this process is developed and the effects of workpiece geometry and deformation speed on the circuit, magnetic field and structure field are considered. The coupling between the electric circuit and magnetic field; magnetic field and workpiece deformation is realized to simulate the actual system of thin plate electromagnetic bulging. The performance of the proposed system is compared with that of the traditional system through investigating the profiles of the induced eddy current, electromagnetic force and forming effect. Simulation results show that the uniformity of sheet metal forming is improved by using the proposed magnetic field shaper, and the maximum uniform deformation area is increasing from 32.1 mm to 73.8 mm, which stimulates more industrial applications of sheet metal electromagnetic forming.
Highlights
Electromagnetic forming is a non-contact high-speed pulse forming technology that can provide improved the forming limit of materials than traditional machining [1]–[6]
In [22], a tube bulging technology based on magnetic field shaper is presented and the results show that the concave radial electromagnetic force generated by the magnetic field shaper can weaken the uneven deformation at the middle part of the tube
To solve the problem of uneven radial deformation in traditional sheet electromagnetic forming, this paper proposes an electromagnetic forming technology based on utilizing a magnetic field shaper
Summary
Electromagnetic forming is a non-contact high-speed pulse forming technology that can provide improved the forming limit of materials than traditional machining [1]–[6]. [12] presented a method that employs a concave driving coil to weaken the radial electromagnetic force in the middle of the tube and improving the tubeforming uniformity. [19] presented an experimental test to study the influence of the electromagnetic magnetic field shaper geometry on the final contour of the bulged tube. In [22], a tube bulging technology based on magnetic field shaper is presented and the results show that the concave radial electromagnetic force generated by the magnetic field shaper can weaken the uneven deformation at the middle part of the tube. This paper is aimed at filling this research gap by presenting a new magnetic field shaper-based method to improve the forming uniformity of sheet metals. The performance of the proposed system is compared with that of a traditional electromagnetic forming system
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