Oriented electromagnetic steel sheet and manufacturing method therefor

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the manufacture of inductors/transformers/magnets, manufacturing tools, circuits, etc., and can solve the problems of uneven iron loss improvement effect, deviation of groove depth, and damage.

Active Publication Date: 2014-12-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the process becomes complicated, the manufacturing cost becomes high, and the processing speed is limited.
[0010] In the method of mechanical tooth profile punching described in Patent Document 3, the electrical steel sheet is a very hard steel sheet containing about 3% Si, so the tooth profile is prone to wear and damage.
When the tooth shape is worn, the groove depth will vary, so the iron loss improvement effect will become uneven

Method used

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  • Oriented electromagnetic steel sheet and manufacturing method therefor
  • Oriented electromagnetic steel sheet and manufacturing method therefor
  • Oriented electromagnetic steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Next, a confirmation experiment conducted to confirm the effects of the present embodiment will be described. First, prepare a slab whose composition is: Si; 3.0% by mass, C; 0.05% by mass, Mn; 0.1% by mass, acid-soluble Al; 0.02% by mass, N; 0.01% by mass, S; 0.01% by mass , P; 0.02% by mass, the rest being Fe and unavoidable impurities. This slab was hot-rolled at 1280° C. to produce a hot-rolled material with a thickness of 2.3 mm. Next, the hot-rolled material was heat-treated on the condition of 1000° C.×1 minute. After the heat treatment, pickling treatment was performed, and cold rolling was performed to produce a cold-rolled material with a thickness of 0.23 mm. This cold-rolled material was subjected to decarburization annealing at 800° C. for 2 minutes, and then coated with an annealing separator mainly composed of magnesium oxide. Then, the cold-rolled material coated with the annealing separator was coiled into a batch furnace in a spiral state, and finis...

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Abstract

For this grain-oriented electrical steel sheet in which grooves extending in the direction intersecting with the conveyance direction are formed at a specified pitch (PL) in the conveyance direction by irradiation of a laser beam: the relationship between the standard deviation (D) of the distance from the linear least squares approximation line for the center line of the grooves in the groove width direction to each position on the center line and the pitch (PL) satisfies formula (1); and the mean angle formed between the tangent at each position on the center line and the direction orthogonal to the conveyance direction is greater than 0° and equal to or less than 30°. 0.02 <= (D / PL) ...(1)

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as a core material of a wound core transformer and a method for manufacturing the same. In particular, it relates to a grain-oriented electrical steel sheet in which core loss is reduced by forming grooves on the surface thereof by laser processing, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2012-103212 for which it applied in Japan on April 27, 2012, and the content of a prior application is used for this application. Background technique [0003] A grain-oriented electrical steel sheet is an electrical steel sheet that contains Si and whose crystal grains have an easy axis of magnetization ({110}<001> orientation) substantially in line with the rolling direction in the manufacturing process. This grain-oriented electrical steel sheet has a structure in which a plurality of magnetic domains m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/364H01F1/18H01F41/02C21D8/12
CPCB23K26/367C22C38/04C21D8/1277B23K26/00B23K26/0807C22C38/06C21D10/005C22C38/02B23K26/0815H01F1/16C21D8/12C21D8/1294C22C38/001C22C38/00B23K26/082B23K26/0821B23K26/364C22C38/002
Inventor 平野弘二新井聪滨村秀行今井浩文
Owner NIPPON STEEL CORP
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