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Laser machining device

A laser processing and laser beam technology, which is applied in metal processing, laser welding equipment, metal processing equipment, etc., can solve the problems of rising manufacturing costs, glass coating or insulating coating interface structure and thickness deviation, and suppression of glass coating defects, etc. problems, to achieve the effect of suppressing defects

Active Publication Date: 2017-03-01
NIPPON STEEL CORP
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Problems solved by technology

Therefore, when the glass coating is flawed, it is necessary to apply the insulating coating again, which increases the manufacturing cost by adding a process.
[0009] In addition, in the manufacture of a grain-oriented electrical steel sheet, heat treatment is performed multiple times, so the interface structure and thickness of the glass coating or insulating coating may vary in the rolling direction and width direction of the steel sheet base.
Therefore, even if the laser conditions are adjusted, it may be difficult to suppress the occurrence of flaws in the glass coating throughout the entire steel sheet base.

Method used

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Embodiment Construction

[0047] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In addition, in this specification and drawings, the same code|symbol is attached|subjected to the component which has substantially the same functional structure, and repeated description is abbreviate|omitted.

[0048]

[0049] The grain-oriented electrical steel sheet is an electrical steel sheet in which the axes of easy magnetization (the direction of the body-centered cubic crystal) of the steel sheet are substantially aligned in the rolling direction in the manufacturing process. In the grain-oriented electrical steel sheet as described above, a plurality of magnetic domains whose rolling direction and magnetization direction coincide are arranged in a state separated by magnetic domain walls. Since such grain-oriented electrical steel sheet is easily magnetized in the rolling direction, it is suitable as a core material of a transformer in which th...

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Abstract

A laser machining device, which is for subdividing the magnetic domains of an oriented electromagnetic steel sheet by condensing a laser beam and scanning same in a scanning direction at the oriented electromagnetic steel sheet, wherein the laser beam condensed at the oriented electromagnetic steel sheet is linearly polarized, and the angle formed by the orientation of the linearly polarized light and the scanning direction is greater than 45 degrees and no greater than 90 degrees.

Description

technical field [0001] The present invention relates to a laser processing device for subdividing magnetic domains by irradiating a grain-oriented electrical steel sheet used for an iron core of a transformer or the like with a laser beam. Background technique [0002] Grain-oriented electrical steel sheets are characterized by being easily magnetized with respect to the rolling direction during steel sheet production. Therefore, the grain-oriented electrical steel sheet is also called a single-oriented electrical steel sheet. Grain-oriented electrical steel sheets can be used as materials for iron cores constituting electrical equipment such as transformers and rotary machines. [0003] When the grain-oriented electrical steel sheet is magnetized, energy loss such as iron loss occurs. In recent years, with the progress of global warming, energy saving of electrical equipment has been sought all over the world. Therefore, a technique capable of further reducing the iron l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12B23K26/073H01F1/16C22C38/00C22C38/06
CPCH01F1/16C22C38/001C22C38/02C22C38/04C21D6/008C22C38/06C21D8/1294C21D9/46B23K26/0006B23K26/0821B23K26/0604B23K26/0738B23K26/352B23K2101/18B23K2103/04B23K26/073C21D8/1277C21D10/005B23K26/00C21D8/12C22C38/00B23K26/356B23K26/0736C22C38/002
Inventor 平野弘二今井浩文滨村秀行坂井辰彦
Owner NIPPON STEEL CORP
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