Grain-oriented silicon steel having heat-resistant magnetic domain and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11633809-B2
Application number	US-201817041323-A
Country	US
Kind code	B2
Filing date	Jun 20, 2018
Priority date	Mar 30, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A heat-resistant magnetic domain refined grain-oriented silicon steel, a single-sided surface or a double-sided surface of which has several parallel grooves which are formed in a grooving manner, each groove extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel, and the several parallel grooves are uniformly distributed along the rolling direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. Each groove which extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel is formed by splicing several sub-grooves which extend in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. The manufacturing method for a heat-resistant magnetic domain refined grain-oriented silicon steel comprises the step of: forming grooves on a single-sided surface or a double-sided surface of a heat-resistant magnetic domain refined grain-oriented silicon steel in a laser grooving manner, a laser beam of the laser grooving is divided into several sub-beams by a beam splitter, and the several sub-beams form the several sub-grooves which are spliced into the same groove.

First claim

The invention claimed is:

1. A grain-oriented silicon steel having heat-resistant relined magnetic domain, the grain-oriented silicon steel comprising:
multiple parallel grooves formed by grooving on surface of one side or of both sides of the grain-oriented silicon steel,
wherein each groove extends in a width direction of the grain-oriented silicon steel, and said multiple parallel grooves are uniformly distributed along a rolling direction of the grain-oriented silicon steel having the heat-resistant refined magnetic domain,
wherein said each groove that extends in the width direction of the grain-oriented silicon steel is formed by splicing multiple sub-grooves that extend in the width direction of the grain-oriented silicon steel having heat-resistant refined magnetic domain,
wherein a cross-section of said each sub-groove in the width direction of the grain-oriented silicon steel is in shape of inverted trapezoid, a long side of the trapezoid has a length L t , and a hypotenuse of the trapezoid has a projected length l e in the width direction of the grain-oriented silicon steel, and
wherein the projected length l e is in a range of no more than 8 mm.

2. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , wherein the trapezoid has a height m of 5 μm-60 μm.

3. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , wherein, among said multiple sub-grooves that forms into one groove, two adjacent sub-grooves are spliced in way of being closely connected with each other, or overlapping with each other, or being transversely spaced with each other.

4. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 3 , wherein the two adjacent sub-grooves have a transverse space l b of no more than 10 mm when transversely spaced with each other.

5. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 4 , wherein following formula is satisfied

l
e

+

l
b

L
t

≤
0.2

wherein, L t is the length of the long side of the trapezoid, l e is the projected length of the hypotenuse of the trapezoid in the width direction of the grain-oriented silicon steel having heat-resistant refined magnetic domain, and l b is a lateral spacing.

6. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 3 , wherein the two adjacent sub-grooves have an overlapping length l e of an overlapped section of no more than 1.5 times of l e when the two adjacent sub-grooves overlap each other.

7. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , wherein adjacent grooves have a spacing d of 2-10 mm therebetween.

8. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , wherein adjacent grooves have a spacing d of 2 mm-10 mm, and the sub-grooves spliced into one groove have offset spacings d 0 of no more than 0.4d in the rolling direction of the grain-oriented silicon steel.

9. The grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , wherein a grooving method of making the grooves is at least one selected from laser grooving, electrochemical grooving, teeth roller grooving, and high-pressure water jet grooving.

10. A method for manufacturing the grain-oriented silicon steel having heat-resistant refined magnetic domain according to claim 1 , comprising steps of: forming grooves on surface of one side or both sides of the grain-oriented silicon steel by means of laser grooving, wherein the laser beam of the laser grooving is split into multiple sub-beams by a beam splitter for forming multiple sub-grooves that are spliced into one groove; thereby producing the grain-oriented silicon steel of claim 1 .

11. The method according to claim 10 , wherein a laser generating pump used for laser grooving is at least one selected from CO 2 lasers, solid-state lasers, and fiber lasers.

12. The method according to claim 10 , wherein a sub-spot formed by a single said sub-beam on the surface of the grain-oriented silicon steel has a single pulse instantaneous peak power density of 5.0×10 5 W/mm 2 -5.0×10 11 W/mm 2 .

13. The method according to claim 12 , wherein a ratio of the single pulse instantaneous maximum peak power density to the single pulse instantaneous minimum peak power density of the sub-spot is no more than 20.

14. The method according to claim 12 , wherein a ratio of the diameter of the sub-spot to the interval between the focal centers of the sub-spots is in the range of 0.1-0.8.

15. The method according to claim 10 , wherein the multiple sub-spots formed by the multiple sub-beams on the surface of the grain-oriented silicon steel have a total length of not more than 20 mm in the laser scanning direction.

16. The method according to claim 10 , wherein the laser grooving is performed before or after the step of decarburization annealing of the grain-oriented silicon steel having heat-resistant refined magnetic domain; or,
before or after the step of hot stretching leveling annealing of the grain-oriented silicon steel having heat-resistant refined magnetic domain.

Assignees

• Baoshan Iron & Steel

Inventors

• Chu Shuangjie
• Zhao Zipeng
• Yang Yongjie
• Ma Changsong
• Wu Meihong
• Ji Yaming
• Ma Aihua
• Xie Weiyong
• Liu Hai
• Guo Jianguo

Classifications

• C21D8/12 Primary

  during manufacturing of articles with special electromagnetic properties · CPC title

• C21D6/008

  containing Si · CPC title

• B23K26/067

  Dividing the beam into multiple beams, e.g. multi-focusing · CPC title

• H01F41/0233

  Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16) · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title