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Method for producing unidirectional electromagnetic steel sheet

By forming a coating on the surface of the steel plate and using etching technology to control the depth of the groove and the conditions of the etching liquid, the problem of difficulty in processing branched fine grooves on the surface of the steel plate in the existing technology is solved, and the groove processing effect does not disappear after stress relief annealing, and the iron Unidirectional electromagnetic steel plate with excellent damage characteristics.

Active Publication Date: 2013-04-03
NIPPON STEEL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, there is a problem that adjacent fine grooves are connected to each other to form a wider main groove

Method used

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  • Method for producing unidirectional electromagnetic steel sheet
  • Method for producing unidirectional electromagnetic steel sheet
  • Method for producing unidirectional electromagnetic steel sheet

Examples

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Embodiment

[0091] Next, examples of the present invention will be described, but the conditions in the examples are examples of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. Various conditions can be adopted in the present invention within the scope of achieving the object of the present invention without departing from the gist of the present invention.

[0092] Prepare a cold-rolled steel sheet containing about 3% by mass of Si, the remainder containing Fe and unavoidable impurities, and coat the surface of the cold-rolled steel sheet with widths w1 and w2 including the exposed portion 2 of the steel sheet under the conditions shown in Table 1 below. The coating film for photoresists of the width p of the steel plate non-exposed portion 3 and the depth s of the steel plate exposed portion 2 .

[0093] Next, in order to form the figure 1 The shown main groove branched in...

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Abstract

A resist film is formed on a cold-rolled steel sheet so as to fabricate a groove by etching. At this point, a steel sheet exposed portion where a portion of the steel sheet is exposed is formed in the resist film, and the steel sheet exposed portion has a first region oriented in a sheet width direction, and a plurality of second regions starting from the first region, widths of the first region and the second regions being 20 [mu]m to 100 [mu]m, and a distance from an end portion of one of the second regions to an end portion of another of the second regions adjacent thereto being 60 [mu]m to 570 [mu]m.

Description

technical field [0001] The present invention relates to a method of manufacturing a grain-oriented electrical steel sheet having grooves formed on its surface. Background technique [0002] A grain-oriented electrical steel sheet having an easy axis of magnetization in the rolling direction of the steel sheet is used for the iron core of a power converter such as a transformer. For the material of the iron core, in order to reduce the loss generated during energy conversion, low iron loss characteristics have been strongly required. [0003] As one method of reducing iron loss, it has been proposed to reduce eddy current loss, which accounts for most of iron loss, by subdividing 180-degree magnetic domains by providing deformation or linear grooves on the surface of the steel sheet. [0004] However, if the method of providing deformation on the surface of the steel sheet is adopted, when stress relief annealing is required when assembling a transformer such as a wound core...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C23F1/02C25F3/14
CPCC21D8/1294C21D8/1255C21D2221/00C22C38/04C25F3/06C21D9/46C23F1/14C22C38/001C21D8/12H01F1/16C22C38/02C22C38/00C23F1/00C22C38/06H01F1/14783C21D6/008C23F1/02C21D2201/05C22C1/02C25F3/14
Inventor 岩田圭司菊地安广
Owner NIPPON STEEL CORPORATION