Directional electromagnetic steel plate and method for manufacturing same

一种电磁钢板、制造方法的技术，应用在制造工具、无机材料磁性、激光焊接设备等方向，能够解决激光到达功率减少、加工效率降低等问题，达到抑制电绝缘性的降低、生产率高、优异铁损特性的效果

Inactive Publication Date: 2012-12-19
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the reaching power of the laser on the steel plate surface is reduced and the processing efficiency is reduced

Method used

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  • Directional electromagnetic steel plate and method for manufacturing same
  • Directional electromagnetic steel plate and method for manufacturing same
  • Directional electromagnetic steel plate and method for manufacturing same

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Embodiment Construction

[0046] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

[0047] The inventors of the present invention have intensively studied the mechanism by which surface protrusions (protrusions, fusion protrusions) of a grain-oriented electrical steel sheet are generated when laser beams are irradiated. As described above, when the laser beam is irradiated, the laser beam is absorbed on the surface of the steel sheet, the base metal of the steel sheet is melted, and fine molten droplets are scattered. This melt is scattered by the pressure of high-temperature metal vapor or plasma at the processing point (laser beam irradiation point). Conventionally, in order to form grooves in grain-oriented electrical steel sheets, CO 2 laser. proceed with CO 2 In experiments in which a laser was used as a light source to form grooves in a grain-oriented electrical steel sheet, the melting phenomenon was studied in detail, and ...

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Abstract

In a method for manufacturing a directional electromagnetic steel plate, grooves which extend in directions including a direction perpendicular to the conveying direction of the directional electromagnetic steel plate and have a predetermined length are formed at predetermined intervals in the conveying direction by applying a laser beam to the surface of the directional electromagnetic steel plate while scanning the laser beam over the surface thereof. Further, in the method for manufacturing the directional electromagnetic steel plate, the laser beam is a continuous-wave laser beam with a laser wavelength (?) of 1.0-2.1 [mu]m inclusive, the power density (Pd) [W / mm2] obtained by dividing the laser beam intensity (P) by the focused beam area (S) is 5105 W / mm2 or more, and the power density (Pd) [W / mm2] and the scan speed (V) [mm / s] of the focused spot of the laser beam on the surface of the directional electromagnetic steel plate satisfy 0.005Pd+3000=V=0.005Pd+40000.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core material of a coiled transformer and a method for manufacturing the same. In particular, it relates to a grain-oriented electrical steel sheet in which iron 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. 2010-85457 for which it applied to Japan on April 1, 2010, and uses the content here. Background technique [0003] The grain-oriented electrical steel sheet is an electrical steel sheet that contains Si and whose crystal grains have an easy magnetization axis (cubic (100)<001>) substantially in line with the rolling direction in the manufacturing process. The grain-oriented electrical steel sheet has a structure in which a plurality of magnetic domains magnetized toward the rolling direction are arrange...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12B23K26/00B23K26/352H01F1/16
CPCC21D8/1294C21D2201/05B23K26/0081B23K26/364B23K26/0006B23K26/40B23K2101/35B23K2103/50Y10T428/12389B23K26/354C21D8/12
Inventor 坂井辰彦滨村秀行
Owner NIPPON STEEL CORP
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