METHOD FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL SHEET AND DEVICE FOR REDUCING CORE LOSS IN GRAIN-ORIENTED MAGNETIC STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a grain-oriented magnetic steel sheet by which a low core loss grain-oriented magnetic steel sheet suitable for a stacked-core transformer or for a ribbon-core transformer can be produced with little variation in magnetic properties, and to provide an core reduction device.;SOLUTION: With the use of a core loss reduction device provided with: a thin cylindrical drum around which a transported grain-oriented magnetic steel sheet being the material to be projected can be wound, and which is freely rotatably arranged and has a plurality of slits elongating axially on a circumferential face; planet rolls for supporting the drum from the inside; and a solid grain projecting device for projecting solid grains from the inside of the drum through the slits onto the material to be projected, after a cold rolling step where the steel sheet is made into a cold rolled sheet with a final sheet thickness, the continuously transported cold rolled sheet is subjected to a strain introduction part or linear groove imparting step in which the continuously transported cold rolled sheet is wound around the thin cylindrical drum, solid grains are projected from the inside of the drum through the slits onto the surface of the cold rolled sheet, and the surface of the cold rolled sheet is given linear strain introduction parts or linear grooves.;COPYRIGHT: (C)2006,JPO&NCIPI