A coupled electric–magnetic numerical procedure for determining the electromagnetic force from the interaction of thin metal sheets and spiral coils in the electromagnetic forming process

Paese, Evandro; Geier, Martin; Homrich, Roberto Petry; Rossi, Rodrigo

doi:10.1016/j.apm.2014.05.032

Cited by 24 publications

(5 citation statements)

References 11 publications

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“…4a. Due to an increasing resistance in the sheet an attracting force (F L < 0) can be observed caused by a phase shifting between inducing current and eddy currents in the sheet [7]. A maximum value for the Lorentz' force is reached with a sheet thickness of about 1.5 mm, but even with a ratio s R , of 1 more than 95% of the maximum force is reached.…”

Section: Process Simulationsmentioning

confidence: 87%

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Effective electromagnetic forces in thin sheet metal specimen

Langstädtler

Schenck

Kuhfuß

2015

MATEC Web of Conferences

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Abstract. Electromagnetic forming is mainly investigated for the macro world as the body forces in this high speed process are decreasing with the volume of the specimen. For micro metal sheets different effects are observed which make an analysis of the acting forces more difficult. Hence, the validity of process simulations for electromagnetic forming is still limited. In this research the effective electromagnetic force on thin EN AW-1050A (Al99.5) sheet metals is investigated by varying the loading energy E C , the ration s R between sheet thickness and skin depth, the sheets width b and the distance d c between passive tool and sheet metal. BackgroundElectromagnetic forming is a high speed forming method where one part of the tool is replaced by a strong pulsed electromagnetic field. In the process a high current peak I max in a tool coil induces eddy currents in an electrical conductive workpiece and accelerates it by repulsive body forces F L (Lorentz' forces) (see Fig. 1).The current peak is generated by a LC-resonator. The process energy E C of the capacitor is influenced by its capacity C and the loading voltage U 0 , Eq. (1).( 1 )According to the skin effect the induced eddy currents are limited to the skin depth . Depending on the coil, the workpiece can be shaped axis-symmetrically or planar and be used for different manufacturing processes like forming, embossing, cutting and joining. A technical advantage of electromagnetic forming is the high deformation rate (typical 2500 1/s [1]) which leads to higher plasticity. By replacing one part of the tool by contactless working forces there are no clearances between tool parts and the risk of abrasion decreases. The economical advantages of electromagnetic forming are the short cycle times and the lower tool costs. For electromagnetic forming the body forces f are depending on the current density J in the sheet and the magnetic field density B, Eq. (2).

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Section: Process Simulationsmentioning

confidence: 87%

“…Several investigations showed, that a previous recommendation for the ratio s R of 3 between sheet thickness and skin depth can be lowered, Eq. (3) [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effective electromagnetic forces in thin sheet metal specimen

Langstädtler

Schenck

Kuhfuß

2015

MATEC Web of Conferences

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“…For the current loop i with radius r, the magnetic flux density at point P (x, y, z) can be obtained by applying Biot-Savart Law. 23 In the cylindrical coordinate system, the mathematical expression of the z-axis direction is:…”

Section: Basic Principlementioning

confidence: 99%

Experimental investigation and optimization on field shaper structure parameters in magnetic pulse welding

Chen

Yang

Peng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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Magnetic pulse welding is a high-speed welding technology, which is suitable for welding light metal materials. In the magnetic pulse welding system, the field shaper can increase the service life of the coil and contribute to concentrating the magnetic field in the welding area. Therefore, optimizing the structure of the field shaper can effectively improve the efficiency of the system. This paper analyzed the influence of cross-sectional shape and inner angle of the field shaper on the ability of concentrating magnetic field via COMSOL software. The structural strength of various field shapers was also analyzed in ABAQUS. Simulation results show that the inner edge of the field shaper directly affects the deformation and welding effect of the tube. So, a new shape of field shaper was proposed and the experimental results prove that the new field shaper has better performance than the conventional field shaper.

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“…The first case occurs, when the penetration depth is lower than the workpiece thickness. Therefore, a current flow is only generated in a layer of the workpiece [15]. The second case is characterized by a current flow in the complete volume and a magnetic body force, which is a result of the high penetration depth in relation to a thin workpiece.…”

Section: Introductionmentioning

confidence: 99%

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

Beckschwarte

Langstädtler

Schenck

et al. 2021

JMMP

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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.

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A coupled electric–magnetic numerical procedure for determining the electromagnetic force from the interaction of thin metal sheets and spiral coils in the electromagnetic forming process

Cited by 24 publications

References 11 publications

Effective electromagnetic forces in thin sheet metal specimen

Effective electromagnetic forces in thin sheet metal specimen

Experimental investigation and optimization on field shaper structure parameters in magnetic pulse welding

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

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