Application of Burnishing Process Expected to Frictional Heat to Non-Oriented Electromagnetic Steel Sheet

Burnishing is a technology used to improve the surface roughness of metals. On the other hand, it is expected that the metal structure near the surface will change due to strong distortion. The magnetic properties of electromagnetic steel sheets depend on large crystal grains and fine crystals near the surface[1]. In particular, thinner fine crystal grain layers on the surface are expected to reduce iron loss. In this study, the power generation characteristics of Burnished electromagnetic steel sheets were evaluated. Electromotive force waveform was evaluated by rotating the laminated electromagnetic steel sheets and using a spindle motor. The electromotive force of Burnished electromagnetic steel sheets decreased compared to that of unprocessed materials. This is assumed to be caused by iron loss due to total deformation by Burnishing. On the other hand, Electromotive force at high rotation improved compared to low rotation. This is thought to be due to the effect of magnetic properties changed by Burnishing.