Method for cutting magnetic steel plate,method for manufacturing magnetic steel plate material and method for manufacturing core

Abstract

The present invention provides a method for cutting an electromagnetic steel sheet by means of a fiber optic laser, a method for producing an electromagnetic steel sheet that minimizes the deterioration of magnetic properties and provides rust prevention, and a method for producing an iron core from the cut electromagnetic steel sheet that suppresses the formation of varnish stains. This invention involves simultaneously irradiating an electromagnet steel sheet with an auxiliary gas having an oxygen concentration of 50% or more by volume and then cutting it with a fiber laser. This process yields an electromagnet steel sheet with an oxide film that prevents rust formation and minimizes the degradation of magnetic properties caused by the heat from the fiber laser. The magnetic properties of the aforementioned electromagnet steel sheet can be restored by annealing.

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