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Method of manufacturing grain-oriented electrical steel sheet exhibiting low iron loss

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, coil manufacturing, and the magnetism of inorganic materials, which can solve the problems of reduced production volume and achieve the effect of suppressing the extension of adjustment time

Active Publication Date: 2016-07-20
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] In addition, in the case of changing the accelerating voltage, it is necessary to readjust various beam conditions such as the optical system and convergence conditions at the same time. Therefore, in the case of frequent changes, the throughput will be greatly reduced, which is not preferable.

Method used

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  • Method of manufacturing grain-oriented electrical steel sheet exhibiting low iron loss
  • Method of manufacturing grain-oriented electrical steel sheet exhibiting low iron loss
  • Method of manufacturing grain-oriented electrical steel sheet exhibiting low iron loss

Examples

Experimental program
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Effect test

Embodiment

[0077] In this example, the head and tail ends of four grain-oriented electrical steel sheet coils of 1500 m each with a nominal thickness (t) of 0.23 mm, 0.27 mm, 0.30 mm, and 0.20 mm were bonded to each other and irradiated with electron beams.

[0078] Electron beam irradiation was carried out under the conditions of accelerating voltage of 60kV, beam diameter of 250μm, beam scanning speed of 90m / s, line angle of 90°, and chamber pressure of 0.1Pa, and the electron beam irradiation time of each coil was recorded. In addition, 4 m of the head and tail end portions of the coils of each plate thickness were set as regions (non-irradiated portions) that were not irradiated with electron beams.

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Abstract

According to the present invention, when irradiating the surface of a grain-oriented electrical steel sheet having a sheet thickness t with an electron beam in a direction intersecting a rolling direction, the irradiation energy E(t) of the electron beam is adjusted to satisfy Ewmin(0.23) (1.61 - 2.83 t (mm)) E(t) Ewmin(0.23) (1.78 - 3.12 t (mm)) (Expression (1)) using the value of the irradiation energy Ewmin(0.23) that minimizes iron loss for material with a sheet thickness of 0.23 mm. The present invention thus allows for a grain-oriented electrical steel sheet with high productivity that can suppress a reduction in productivity caused by optical system adjustment operations or by shortening of line spacing.

Description

[0001] The patent application for this invention is a divisional application for an invention patent application whose date of entering the Chinese national phase is April 17, 2015, the Chinese patent application number is 201380054476.7, and the invention name is "Manufacturing method of low iron loss grain-oriented electrical steel sheet". . technical field [0002] The present invention relates to a method for producing a grain-oriented electrical steel sheet used for transformer cores and the like. Background technique [0003] In recent years, the efficiency of energy utilization has been advanced. For example, in transformers, the reduction of energy loss during operation is pursued. [0004] Here, the loss generated in the transformer mainly includes the copper loss generated in the wire and the iron loss generated in the iron core. Furthermore, iron loss can be divided into hysteresis loss and eddy current loss, and it is well known that methods such as improving th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12
CPCC21D8/12C21D8/1244C21D2201/05H01F1/16C21D1/09C21D1/34C21D9/46H01F41/04
Inventor 高城重宏上坂正宪花泽和浩
Owner JFE STEEL CORP
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