Numerical and Experimental Investigation of the Impact of the Electromagnetic Properties of the Die Materials in Electromagnetic Forming of Thin Sheet Metal

Abstract

In electromagnetic forming of thin sheet metal, the die is located within the effective range of the electromagnetic wave. Correspondingly, a current is induced not only in the sheet metal, but also in the die. Like the current in the workpiece, also the current in the die interacts with the electromagnetic wave, resulting in Lorentz forces and changes of the electromagnetic field. With the aim to study the influence of different electromagnetic die properties in terms of specific electric resistance and relative magnetic permeability, electromagnetic simulations were carried out. A change in the resulting forming forces in the sheet metals was determined. To confirm the simulation results, electromagnetic forming and embossing tests were carried out with the corresponding die materials. The results from simulation and experiment were in good agreement.

An Application of a Magnetic Impulse for the Bending of Metal Sheet Specimens

“…The research presented in [ 19 , 20 ] presents the bending of sheet metal specimens in a magnetic field. The results show that the differences in magnetic pulse bending are minimal in comparison to the method described there.…”

“…In the presented analysis in manufacturing companies, we came across this phenomenon, i.e., a lack of funds. This presented solution would certainly not burden the companies’ budget considerably, as it would practically only replace the active parts of the forming equipment, which would speed up this work, make it more attractive, and would make it relatively easy for any just-trained worker and increase safety at work [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

High-efficiency computation for electromagnetic forming process: An explicit-implicit GPU approach

“… 4 , 5 , 6 Researchers have done a large amount of work on the numerical simulation of EMF process. 7 , 8 , 9 So far, there are still two key problems worthy of special attention: one is the coupling strategy of the electromagnetic field and mechanical field 10 and another is the computational efficiency of complex EMF scenarios.…”

Impact of Die Coatings on Forming Conditions in Electromagnetic Embossing of Thin Sheet Metal

“…Regarding eddy current in the die, Beckschwarte et al showed how electromagnetic properties of dies can be used to affect the electromagnetic forming process by effecting field and current densities, force vectors and material forming behavior [18]. Therefore, based on the property gradient of the embossing dies by the coating, the interaction of coating and substrate material must be considered regarding the conditions of the embossing process of thin sheet metals.…”