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Grain-oriented electrical steel sheet and magnetic domain refining method therefor

A technology of oriented electrical steel sheets and electrical steel sheets, which is applied in the direction of manufacturing tools, metal processing, metal processing equipment, etc., can solve the problem of magnetic flux density reduction and achieve the effect of improving iron loss

Active Publication Date: 2020-08-14
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, due to the deep groove depth, there will also be side effects such as reduced magnetic flux density, etc.

Method used

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  • Grain-oriented electrical steel sheet and magnetic domain refining method therefor
  • Grain-oriented electrical steel sheet and magnetic domain refining method therefor
  • Grain-oriented electrical steel sheet and magnetic domain refining method therefor

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0069] Experimental example 1: Spacing between groove and thermal shock line

[0070] A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.20 mm was prepared. Grooves were formed on one surface of the electrical steel sheet by using a continuous fiber (Fiber) laser and irradiating laser light with a copper (copper) mirror. The width W of the laser beam was 50 μm, and the length L of the laser beam was 5000 μm. The energy density of the laser is 1.5J / mm 2 , the depth of the trench is 10 μm.

[0071] The pitch d1 between the trenches organized in Table 1 below formed trenches, and an insulating film was formed.

[0072]Subsequently, a continuous fiber laser is used on one or the other surface of the electrical steel sheet, and a copper mirror is used to irradiate the laser light to form thermal shock lines. The width W of the laser beam was 500 μm, and the length L of the laser beam was 10000 μm. The energy density of the laser is 0.1J / mm 2 .

[007...

experiment example 2

[0080] Experimental Example 2: Groove Depth

[0081] A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.20 mm was prepared. Grooves are formed on one surface of an electrical steel sheet by using a continuous fiber (Fiber) laser and irradiating laser light with a copper (copper) mirror. The width W of the laser beam is 50 μm, and the length L of the laser beam is 5000 μm. The energy density of the laser light and the depth of the groove were changed to the values ​​shown in Table 2 below, respectively.

[0082] The pitch d1 between the trenches organized in Table 2 below formed trenches, and an insulating film was formed.

[0083] The thermal shock lines are formed on one surface of the steel plate with the same spacing d2 between the thermal shock lines as the spacing d1 between the grooves described below, and the average spacing g between the grooves and the thermal shock lines is adjusted to 0.7 to 0.8 mm.

[0084] 【Table 2】

[0085]

[008...

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Abstract

A grain-oriented electrical steel sheet according to an embodiment of the present invention comprises a linear groove formed in a direction crossing a rolling direction on one surface of the electrical steel sheet; and a linear thermal impact portion formed in a direction crossing the rolling direction on one surface of the electrical steel sheet, wherein the groove and the thermal impact portionare 1 mm or less distant from each other.

Description

technical field [0001] The invention relates to a oriented electrical steel sheet and a magnetic domain refinement method thereof. More particularly, the present invention relates to a grain-oriented electrical steel sheet and a magnetic domain refinement method thereof, by combining a permanent magnetic domain refinement method and a temporary magnetic domain refinement method to refine the magnetic domains to a minimum size. Background technique [0002] Grain-oriented electrical steel sheets are used as core materials for electrical products such as transformers. Therefore, in order to reduce the power loss of electrical equipment and improve the energy conversion efficiency, the iron core material should be excellent in iron loss, and a steel plate with a high duty ratio when stacked and coiled is required. [0003] Oriented electrical steel sheet refers to the functional properties of grains that have been recrystallized secondary to the hot rolling, cold rolling and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C21D8/12
CPCC21D8/1277C21D8/1283C21D8/1294B23K26/364C21D10/005B23K26/0006B23K26/08B23K26/356B23K26/40B23K2101/36B23K2103/04
Inventor 朴世珉金在洙闵基荣洪盛喆李原杰
Owner 浦项股份有限公司
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