| 摘要 |
A magnetic domain refining treatment is performed by dividing a surface of a steel sheet into a plurality of regions in a widthwise direction, disposing a laser irradiation apparatus or an electron beam irradiation apparatus in each of the regions, and forming beam-irradiated regions through beam irradiation, wherein beams are irradiated so that a nature of a juncture between beam-irradiated regions satisfies 0 ‰¤ ± ‰¤ 0.3×a and -1.2×a + 0.02xw - 0.5×± - 6.5 ‰¤ ² ‰¤ -0.13xa - 200×(1/w) + 5.4 when TD spacing ² at the juncture between the beam-irradiated regions is set to a range of -3 to 0 mm, whereby a grain oriented electrical steel sheet having an excellent iron loss property is produced in a good productivity. Here, ±, is RD spacing (mm) at a juncture between beam-irradiated regions, ² is TD spacing (mm) at a juncture between beam-irradiated regions, a is beam spacing (mm), and w is average width of magnetic domain discontinuous part (µm). |
