METHOD FOR FORMING GROOVE OF STEEL SURFACE, AND THR DEVICE

摘要

A method for forming a groove in a surface of a steel plate and an apparatus therefor are provided. The present invention is configured such that in case laser beams are radiated to a scanning mirror from multiple laser oscillators and then radiated to a surface of a steel plate after passing through the scanning mirror, in order to form, in the surface of the steel plate, a groove having a depth of at most 10% of the thickness of the steel plate by means of laser radiation, one scanning mirror is shared by two or more laser beams, thereby minimizing the influence of heat on the part with the groove at a high line speed of at least 20 mpm and thus having an improved core loss characteristic before and after heat treatment.