An experiment and simulation study of the rebound effect in electromagnetic forming process
Loading...
Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Electromagnetic forming (EMF) has been proved to be a useful method to form the
aluminium alloy sheet as it has so many advantages. As a high-speed forming process, it
can suppress crack, reduce springback, and improve the formability of material at room
temperature. But in the process of EMF, the rebound effect caused by high velocity impact
has an important effect on the flatness of the formed part. Then a spring damper system
has been added under the female stop block to eliminate this effect. The results of formed
shape, thickness distribution and stress and strain state are investigated by comparing with
free-forming process. On the other hand, the influence of spring stiffness and damping
coefficient is analysed by using of ANSYS loose-coupled method. The results shows that it
helps to improve the flatness of formed parts with a spring damper system used. Beside of
the changing of formed shape, the difference of stress strain state results in difference of
thickness distribution. And crack happened at the bottom is supressed, and this does
favour for further processing. Furthermore, the results also shows that low spring stiffness
and right damping coefficient are benefit for reducing the rebound effect.
Description
Table of contents
Keywords
electromagnetic metal forming (EMF), spring damper, rebound effect,, impact