| 摘要 |
PURPOSE:To reduce iron losses due to mirror-finishing treatment of silicon steel sheet surface, by subjecting the surface of a finish-annealed grain-oriented silicon steel sheet to mechanical polishing by use of elastic abrasive material so as to form a smooth surface having a specific surface roughness. CONSTITUTION:The matrix surface of a finish-annealed grain-oriented silicon steel sheet is subjected to mechanical polishing by use of elastic abrasive material so as to be formed into smooth surface of <=0.3mum average roughness Ra. As the above elastic abrasive material, the one prepared by allowing abrasive grains to adhere to a matrix such as polyurethane, etc., and the like are used. In this way, irregular strain is applied to the matrix surface, so that deterioration in magnetism can be prevented. Further, by forming, if necessary, a tension- giving film of TiN, etc., on the surface of the above mirror-finished surface, magnetic properties can be improved to a greater extent. |
