Electrical steel sheet and method for manufacturing the same
US10804015B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2018 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Nov 22, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1294
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is an electrical steel sheet comprising: a groove formed in a surface of a steel sheet, wherein the groove includes a bottom surface, a first side surface extending from the bottom surface, and a second side surface extending from the bottom surface in opposite to the first side surface, wherein the groove has a depth from the surface to the bottom surface, a width in a rolling direction of the steel sheet, and a length in a width direction of the steel sheet, and wherein the groove is formed through laser-irradiation and removal of melt produced by the laser-irradiation; an opening defined by the bottom surface, the first side surface and the second side surface; and a first solidification portion formed on the first side surface of the groove. The first solidification portion is formed by a solidification of part of the melt produced from the laser-irradiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.