Grooving Method, Grooving Device, And Grain Oriented Electrical Steel Sheet

Abstract: Provided is a grooving method for forming grooves on a grain-oriented electrical steel sheet, wherein: the method includes a grooving step for forming, by scanning a laser beam, linear grooves at constant intervals or non-constant intervals in a rolling direction of the grain-oriented electrical steel sheet, such that the grooves have a maximum depth of 10 to 50 µm and extend in the scanning direction, which is a direction parallel to a width direction of the grain-oriented electrical steel sheet, the width direction being perpendicular to the rolling direction, or a direction tilted by a prescribed angle from the width direction; the laser beam has a center irradiation section, which is a region including a center of an optical path of the laser beam through which the laser beam is irradiated, and a peripheral irradiation section, which is a region in the periphery of the center irradiation section irradiated with the laser beam; and the energy density [J/cm2] of the center irradiation section is set to be greater than the energy density [J/cm2] of the peripheral irradiation section.

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