Pesignation of Document] SPECIFICATION [Title of the Invention] METHOD OF MANUFACTURING GRAIN-ORIENTED MAGNETIC STEEL SHEET [Technical Field] [0001] The present invention relates to a method of manufacturing a grain-oriented magnetic steel sheet in wliich a glass coating and an insiilatmg coating are formed on a surface of a steel sheet part and a magnetic domain is controlled by laser irradiation, [Backgroimd Art] [0002] The above-described grain-oriented magnetic steel sheet is used as a material constituting an iron core of an electrical device such as a transformer and a rotating macliine. Regarding such a grain-oriented magnetic steel sheet, it is required to reduce energy loss (iron loss) upon magnetization. The iron loss is classified as eddy-ciurent loss and hysteresis loss. The eddy-ciurent loss is classified as classical eddy-current loss and anomalous eddy-current loss. [0003] Here, m order to reduce classical eddy-current loss, there is provided a thin grain-oriented magnetic steel sheet in v^'hich an insulating coating is formed on a siu-face of the sheet. As a grain-oriented magnetic steel sheet having an insulating coating fonned thereon, for example, a steel sheet having a two-layer structure in which a glass coating is formed on a surface of a steel sheet part and an insulating coating is formed on the glass coating is proposed as shown in Patent Document 1. [0004] In addition, in order to suppress anomalous eddy-current loss, for example, a magnetic domain control method of subdividing a magnetic domain by providing a region having residual strain at intervals in a rolling direction by: focusing and applying a laser beam from above an insulating coating; and performing scannuig in an approximately width direction of a magnetic steel sheet is proposed as shown in Patent Dociunents 2 and 3. [0005] A material of the above-described grain-oriented magnetic steel sheet is, for example, a silicon steel slab, mad the steel sheet is manufactured in the order of a hot rolling process -^ an annealing process -» a cold rolling process —> a decarburization annealing process —> a final finish annealing process —> an insulating coating fomiing process -^ a laser irradiation process. Here, in the annealing before the final finish annealing process, an oxide layer mainly containing silica (Si02) is formed on the surface of the steel sheet part. In addition, in the final finish annealing process, the steel sheet part is heat-treated using a i batch furnace while being coiled into a coil shape. Therefore, an annealing separator mainly containing magnesia (MgO) is applied to the surface of the steel sheet part before tlie final finish annealing process in order to prevent sticking of the steel sheet part in the final finish annealing process. In the final finish annealing process, the oxide layer mainly containing silica and the annealing separator mainly containing magnesia are reacted, and thus the above-described glass coating is formed. [0006] In the laser irradiation process, the insulating coating is formed on the glass coating, and tlie laser beam irradiation is performed from above this insulating coating to control the magnetic domain. Here, in some cases, scratches are caused on the insulating coating and the glass coating due to thcirradiation of the laser beam. Here, the scratches are coating damages such as loss/peeling, rise, deterioration, discoloration of the coatings, and can be recognized by visual examination such as visual or microscope observation. Particularly, when the glass coating is scratched, the steel sheet part is exposed to tlie outside and rust is caused. Tlierefore, when the glass coating is scratched, it is necessary to apply an insulating coating again. [0007] In addition, regarding the grain-oriented magnetic steel sheet, a lot of heat treatments are performed, and thus in some cases, a variation occurs in the interface structure or thickness of the glass coating or the insulating coating in a longitudinal direction (rolling direction) and a width direction of the steel sheet part. Accordingly, in some cases, it is difficult to securely suppress the occurrence of scratches on the glass coating over the entire steel sheet part, even when the laser irradiation conditions are adjusted. [0008] From such circumstances, a method of manufacturing a grain-oriented magnetic steel sheet has been required to suppress the occurrence of scratches on a glass coating due to laser irradiation and to thus provide a high-quality grain-oriented magnetic steel sheet than ever before. [Citation List] [Patent Dociunent] [0009] [Patent Document 1 ] Japanese Unexamined Patent Application, First Publication No. 2007-119821 [Patent Document 2] Published Japanese Translarion No. 2003-500541 of the PCT International Publication [Patent Document 3] Japanese Examined Patent Application, Second Pubhcation No. H06-019112 [Summary of the Invention] [Problem to be solved by the Invention] [0010] A method of manufacturing a grain-oriented magnetic steel sheet of the present invention is a method of manufacturing a grain-oriented magnetic steel sheet which has a steel sheet part, a glass coating formed on a surface of the steel sheet part, and an insulating coating formed on the glass coating. The metliod includes: a final finish aimeahng process of performing annealing in a batch furnace in a state in which the steel sheet part is coiled into a coil shape to form the glass coating on a surface of the steel sheet part; an insulating coating forming process of forming the insulating coating on the glass coating after the final finish annealing process; and a laser irradiation process of performing a laser beam irradiation from above the insulating coating to control a magnetic domain, wherein in the laser irradiation process, the surface which faces an outside in a radial direction of a coil during the final fmish annealing process is irradiated with a laser beam. [0011] In the final finish annealing process, the heat treatment is performed in the batch furnace in a state in which the steel sheet part is coiled into a coil shape, and the glass coating is fonned on a surface which faces an outside in a radial direction of the coil shaped steel sheet pait and a surface which faces an inside in the radial direction. In the insulating coating forming process, the msulating coating is fonned on the glass coating in a state in which the steel sheet part coiled into a coil shape is imcoiled and expanded into a sheet shape. In the laser irradiation process, in a state in which the steel sheet part havuig the glass coating and the msulating coating formed thereon is expanded into a sheet shape, the surface of the sheet is irradiated with the laser beam. [0012] Here, when the steel sheet part coiled into a coil shape is imcoiled and expanded into a sheet shape, compression stress acts on the glass coating formed on the surface which faces the outside in the radial direction of the coil, and tensile stress acts on the glass coating formed on the surface which faces the inside in the radial direction of the coil. In addition, the glass coating has such properties that it is weak in terms of the tensile stress, but is strong in terms of the compression stress. Therefore, in the laser irradiation process, if the surface which faces the outside in the radial direction of the coil during the final fmish annealing process, that is, the glass coating on which the compression stress acts, is irradiated with the laser beam, the occurrence of scratches on the glass coating can be suppressed. Therefore, it is not necessary to form an insulating coating again after the laser irradiation process, and it is possible to significantly improve the production efficiency of the grain-oriented magnetic steel sheet. [Effects of the Invention] [0013] According to the present invention in which a laser beam is focused and applied to a surface which faces the outside in a radial direction of a coil during a final finish anneahng process in which an adhesion between a steel sheet body (matrix) and a glass coating does not deteriorate, it is possible to securely suppress the occurrence of scratches on the glass coating, and it is possible to provide a high-quality grain-oriented magnetic steel sheet. [Brief Description of Drawings] [0014] FIG. 1 is a cross-sectional diagram illustrating a grain-oriented magnetic steel sheet manufactured by a method of manufacturing a grain-oriented magnetic steel sheet according to an embodiment of the present invention. FIG. 2 is a flow diagram of the method of manufacturing a grain-oriented magnetic steel sheet according to the embodiment of the present invention. FIG. 3 is a schematic diagram illustrating the decarburization annealing process and the aimealing separator application process in FIG. 2. FIG. 4 is a schematic diagram illustrating the final finish annealing process in FIG. 2. FIG. 5 is a schematic diagram illustrating the insulating coating forming process in FIG. 2. FIG. 6 is a schematic diagram illustratuig the laser irradiation process in FIG. 2. FIG. 7 is a diagram showing evaluation results of invention examples. FIG. 8 is a diagram showing evaluation results of comparative examples. [Description of Embodiments] [0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. [0016] A grain-oriented magnetic steel sheet 10 shown in FIG. 1 is provided with a steel sheet part (matrix) 11, a glass coating 12 which is formed on a surface of the steel sheet part 11, and an insulating coating 13 which is formed on the glass coating 12. The steel sheet part (matrix) 11 is constituted by an iron alloy containing Si. In this embodiment, die iron alloy has a composition containing 2,5 mass% to 4.0 mass% of Si, 0.02 mass% to 0.10 mass% of C, 0.05 mass% to 0.20 mass% of Mn, 0.020 mass% to 0.040 mass% of acid-soluble Al, 0.002 mass% to 0,012 mass% of N, 0.001 mass% to 0.010 mass% of S, 0.01 mass% to 0,04 mass% of P, and a balance formed of Fe and unavoidable impiuities. Generally, the thicl