Effect of the Duration of Electromagnetic Pulse Force on the Rebound Suppression in V-Bending Experiment
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Date
2014
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Abstract
Electromagnetic Forming (EMF) is one of the high speed forming technologies. The
spatial distribution and temporal evolution of electromagnetic body force and the
constraint imposed by the die on the sheet metal, are key factors which influence the
dynamic deformation behaviour of sheet metal. The great force induced by the collision at
high speed of the sheet and the die causes the rebound of the sheet off the die. The
rebound has a significant influence on the final shape of the part. On the basis of the
comparison of time relationship between the displacement of the sheet metal and the
amplitude of electromagnetic force, the study about the rebound phenomenon in an
electromagnetic V-bending experiment and its numerical simulation model is carried out in
this paper. Collision promotes deformation process, resulting in a drastic change of sheet
geometry in which a new distribution of electromagnetic force helps the part to fit the die.
The attenuation of force caused by distance increase is comparatively weak when forming
into a shallow die, so that the electromagnetic force maintains enough intensity which can
effectively suppress the rebound and help to calibrate the V-Shape of the part. Increasing
the duration of coil current pulse helps to suppress rebound effect of sheet metal when
forming into a shallow die.
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Keywords
Electromagnetic forming, Duration, Rebound, V-bend, Aluminium alloy