Method for production and apparatus for production of grain-oriented electrical steel sheet excellent in magnetic properties
US7883586B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2006 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Aug 29, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Technology scanning and irradiating grain-oriented electrical steel sheet moving in a rolling direction at a speed Vl with an elliptical spot formed by a laser beam in the width direction at Vc to improve the core loss of the grain-oriented electrical steel sheet, which adjusts the angle θs formed by the scan direction of the elliptical beam and the long axis of the ellipse based on the equation θs=tan−1(Vl/Vc) and which constructs the system for adjusting the θs by an optical system for laser irradiation comprised of a cylindrical lens telescope, scan mirror, and fθ lens arranged in that order, a system for changing the angle of the cylindrical lens telescope with respect to the scan direction of the scan mirror, and a system for changing the distance between lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.