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Production method for oriented magnetic 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: 2015-06-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] In addition, in the case of changing the accelerating voltage, various beam conditions such as the optical system and convergence conditions need to be readjusted 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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  • Production method for oriented magnetic steel sheet exhibiting low iron loss
  • Production method for oriented magnetic steel sheet exhibiting low iron loss
  • Production method for oriented magnetic steel sheet exhibiting low iron loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] 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.

[0077] 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 a surface of an oriented magnetic steel sheet having a plate thickness of t with an electron beam in the direction intersecting the rolling direction, a value of irradiation energy Ewmin(0.23) at which iron loss of a material having a plate thickness of 0.23 mm is at a minimum is used to adjust the irradiation energy E(t) of an electron beam such that formula (1) is satisfied (Formula (1): Ewmin(0.23) x (1.61-2.83 x t(mm)) ≤ E(t) ≤ Ewmin(0.23) x (1.78-3.12 x t(mm))). As a result, an oriented magnetic steel sheet can be achieved, with which reductions in productivity due to optical system adjustment operations and line spacing shortening can be inhibited, and high productivity can be attained.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet used for transformer cores and the like. Background technique [0002] In recent years, the efficiency of energy utilization has been advanced. For example, in transformers, the reduction of energy loss during operation is pursued. [0003] 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 the crystal orientation of raw materials and reducing impurities are effective in reducing the former. For example, Patent Document 1 discloses a method for producing a grain-oriented electrical steel sheet excellent in magnetic flux density and iron loss by optimizing annealing conditions before final cold rolling. [0004] On the other hand, it ...

Claims

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Application Information

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IPC IPC(8): C21D8/12H01F1/16
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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