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Production method and production system of directional electromagnetic steel plate having excellent magnetic characteristics

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the field of manufacturing directional electrical steel sheet at high-speed manufacturing line speed, can solve the problems of increased influence, longer beam residence time, and greater influence, achieve stable magnetic properties, and suppress laser irradiation The effect of increasing the width

Active Publication Date: 2008-10-29
NIPPON STEEL CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the beam residence time becomes longer, so the influence of steel plate movement on the effective laser irradiation width becomes larger
That is, there is a problem that the better the magnetic properties and the higher the production capacity of the manufacturing equipment, the greater the impact

Method used

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  • Production method and production system of directional electromagnetic steel plate having excellent magnetic characteristics
  • Production method and production system of directional electromagnetic steel plate having excellent magnetic characteristics
  • Production method and production system of directional electromagnetic steel plate having excellent magnetic characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Table 1 shows examples in which iron loss characteristics of electrical steel sheets after laser irradiation were compared between cases where the method and apparatus of the present invention were used and cases where they were not.

[0070]The shape of the elliptical beam focusing spot in this embodiment is that the major axis of the ellipse dc=1.0 mm and the minor axis dl=0.05 mm. The scanning speed Vc=30m / s, the rolling direction speed of the steel plate Vl=1.5m / s. The laser light intensity is 300W, and the pitch of the irradiation lines in the rolling direction is 5mm.

[0071] In Table 1, B8 is the magnetic flux density of the steel sheet generated under a magnetic force of 800 A / m. W17 / 50 is the iron loss at an AC excitation frequency of 50 Hz and a maximum magnetic flux density of 1.7 T. The comparative example is the iron loss characteristic in the case where the method of the present invention is not used, and the laser beam is irradiated with the beam scann...

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Abstract

In a technology for improving iron loss of a directional electromagnetic steel plate moving in the rolling direction at a speed Vl by performing scanning irradiation with a laser beam of elliptical spot in the plate width direction at a speed Vc, the angle thetas between the scanning direction of the elliptical beam and the long axis of the ellipse is regulated based on an expression thetas=tan<-1>(Vl / Vc). The arrangement for regulating the thetas comprises an optical unit for laser irradiation where a cylindrical lens telescope, a scanning mirror, and an ftheta lens are arranged in this order, a device for altering the angle of the cylindrical lens telescope against the scanning direction of the scanning mirror, and a device for altering the distance between the lenses.

Description

technical field [0001] The present invention relates to a technique for producing a grain-oriented electrical steel sheet whose magnetic properties are improved by irradiating a surface of a grain-oriented electrical steel sheet with a laser beam, and particularly relates to a technique suitable for producing a grain-oriented electrical steel sheet at a high production line speed. Background technique [0002] An electrical steel sheet in which the easily magnetized axes of crystals are aligned in substantially the same direction throughout the steel sheet is called a grain-oriented electrical steel sheet, and the direction of the easily magnetized axes coincides with the rolling direction of the steel sheet. Such a steel plate is very good as a material for a transformer core with a constant magnetization direction. [0003] The iron loss when the grain-oriented electrical steel sheet is magnetized by alternating current is divided into eddy current loss and hysteresis loss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12H01F1/16B23K26/352
CPCC21D8/12C21D8/1294C21D9/46C21D10/005H01F1/16B23K26/0736B23K26/0006B23K26/082B23K26/352
Inventor 坂井辰彦滨村秀行
Owner NIPPON STEEL CORP
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