The aim of this paper is to present how springback can be controlled when the electromagnetic forming technique (EMF) is used as a second corrective step; bringing formed parts to the desired final shape by means of magnetic impulses in critical areas (residual stress) of the formed components. This analysis is based on the results of two experimental studies. In the first, the selected preformed specimen shape is the L-shape bent part of HSS DP600, in 0.8 and 1.95 mm thickness, and Aluminium Alloy 5754, in 1 and 2 mm thickness. The second geometries are two rocket nozzle panels made of a thick but soft copper alloy. While the geometry and the material are the similar, the first approach of this work was developed using smaller panels (about 30 cm long) and the full size (about 1 m long), in order to study the behaviour of the material and the approximate energy levels required to scale up the full size panels. The experimental results reveal that the most important 'new' parameter to take into account on this process is the conductivity of the material. Overall this study shows EM forming can have a potent effect in controlling springback. The tooling for this method is relatively simple and very flexible even to couple it into an industrial configuration.
Electromagnetic springback reshaping
2006
8 Seiten, 10 Bilder, 2 Quellen
Conference paper
English
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