Impact of guillotine cutting on losses in silicon steel

An experimental study of the impact of cutting processes on the magnetic properties of electrical steel sheets is presented. Cuttings by guillotine and electric discharge machining, with and without heat treatment, are considered. Microstructural observations confirm the presence of a very high level of deformation at the cutting edge. Recrystallization leads to new grains whose reduced size leads to a level of losses higher than the nominal losses.