METHOD FOR PRODUCING GRAIN ORIENTED SILICON STEEL SHEET, GRAIN ORIENTED SILICON STEEL SHEET PRODUCTION DEVICE, AND GRAIN ORIENTED SILICON STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a grain oriented silicon steel sheet in which recessed grooves formed at a grain oriented steel sheet can reach a stationary depth from the edge part in the longitudinal direction in a short distance, a grain oriented silicon steel sheet production device, and a grain oriented silicon steel sheet.;SOLUTION: Provided is a grain oriented silicon steel sheet production device forming a plurality of recessed grooves U, comprising: a laser beam irradiation apparatus 11 irradiating a laser beam LB; a polyhedral polygon mirror 12 scanning the laser beam LB; a rotary driving unit 13; a rotary position detection sensor 14 detecting the rotary angle of the polyhedral polygon mirror 12; and a control unit 15. The control unit 15 allows the output of the laser beam LB and the rotary speed of the polyhedral polygon mirror 12 to correspond with the rotary angle of the polyhedral polygon mirror 12 and controls the energy density of the irradiated laser beam LB to a specified range.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2017,JPO&INPIT