Method for forming linear groove on steel strip and method for manufacturing grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-2018057956-A1
Application number	US-201515538355-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 25, 2014
Publication date	Mar 1, 2018
Grant date	—

Abstract

A resist coating for etching use which enables high speed and high accuracy patterning is provided by applying, to a steel strip, a negative resist ink which solidifies upon exposure to light; drying the ink to form a resist coating; then irradiating the steel strip with light while moving a mask member in synchronization with a traveling speed of the steel strip, the mask member being configured to cover a surface of the resist coating to block light, to thereby solidify a portion of the resist coating not covered with the mask member to form a solidified portion; and removing an unsolidified portion other than the solidified portion with a developing solution. Subsequently, by dissolving and removing by etching a portion of the steel strip below the removed portion of the resist coating, a fine and uniform linear groove can be formed in a surface of the steel strip.

First claim

1 . A method for forming linear grooves on a steel strip, the method comprising:
applying, to a continuously-traveling steel strip, a negative resist ink which solidifies upon exposure to light; then drying the negative resist ink to form a resist coating; then irradiating the steel strip with light while moving a mask member in synchronization with a traveling speed of the steel strip, the mask member being configured to cover a surface of the resist coating to block light, to thereby solidify a portion of the resist coating that is not covered with the mask member to form a solidified portion; then removing a remaining portion other than the solidified portion of the resist coating with a developing solution; and then performing etching to dissolve and remove a portion of the steel strip below the removed portion of the resist coating, to thereby form a linear groove.

2 . The method for forming linear grooves on a steel strip according to claim 1 , wherein the mask member is provided in the form of an endless belt that loops around a pair of rotating rolls to enable rotational movement of the mask member, the pair of rotating rolls being disposed adjacent to the steel strip and parallelly arranged in a traveling direction of the steel strip, wherein a speed of the rotational movement of the mask member is synchronized with the traveling speed of the steel strip.

3 . The method for forming linear grooves on a steel strip according to claim 1 , wherein the mask member is formed in a cylindrical shape and is arranged at a position adjacent to the steel strip with its axis in parallel to the width direction of the steel strip, and at this arrangement position the cylindrical mask member is caused to rotate about the axis as a rotation axis, wherein a peripheral speed of the cylindrical mask member is synchronized with the traveling speed of the steel strip.

4 . The method for forming linear grooves on a steel strip according to claim 1 , wherein a thickness of the resist coating is set to 15 μm or less.

5 . The method for forming linear grooves on a steel strip according to claim 1 , wherein a gap between the mask member and the resist coating is set to 150 μm or less.

6 . The method for forming linear grooves on a steel strip according to claim 1 , wherein a width of the remaining unsolidified portion other than the solidified portion is set to 20 μm or more and 500 μm or less.

7 . The method for forming linear grooves on a steel strip according to claim 1 , wherein a plurality of the linear grooves are formed at an angle of 30° or less with respect to the width direction of the steel strip and at a pitch of 20 mm or less in the longitudinal direction of the steel strip.

8 . The method for forming linear grooves on a steel strip according to claim 1 , wherein a groove depth of each linear groove is set to 5 μm or more.

9 . A method for manufacturing a grain-oriented electrical steel sheet, comprising:
heating a silicon steel slab; then hot rolling the steel slab to obtain a hot-rolled sheet; optionally subjecting the hot-rolled sheet to hot band annealing; then subjecting the hot-rolled sheet to cold rolling either once, or twice or more with intermediate annealing performed therebetween, to obtain a steel strip; then subjecting the steel strip to decarburization annealing; then applying an annealing separator to the steel strip; and subsequently subjecting the steel strip to final annealing, wherein a linear groove is formed in a surface of the steel strip subjected to the cold rolling by applying the method as recited in claim 1 .

10 . A method for manufacturing a grain-oriented electrical steel sheet, comprising:
heating a silicon steel slab; then hot rolling the steel slab to obtain a hot-rolled sheet; optionally subjecting the hot-rolled sheet to hot band annealing; then subjecting the hot-rolled sheet to cold rolling either once, or twice or more with intermediate annealing performed therebetween, to obtain a steel strip; then subjecting the steel strip to decarburization annealing; then applying an annealing separator to the steel strip; and subsequently subjecting the steel strip to final annealing, wherein a linear groove is formed in a surface of the steel strip subjected to the cold rolling by applying the method as recited in claim 2 .

11 . A method for manufacturing a grain-oriented electrical steel sheet, comprising:
heating a silicon steel slab; then hot rolling the steel slab to obtain a hot-rolled sheet; optionally subjecting the hot-rolled sheet to hot band annealing; then subjecting the hot-rolled sheet to cold rolling either once, or twice or more with intermediate annealing performed therebetween, to obtain a steel strip; then subjecting the steel strip to decarburization annealing; then applying an annealing separator to the steel strip; and subsequently subjecting the steel strip to final annealing, wherein a linear groove is formed in a surface of the steel strip subjected to the cold rolling by applying the method as recited in claim 3 .

12 . A method for manufacturing a grain-oriented electrical steel sheet, comprising:
heating a silicon steel slab; then hot rolling the steel slab to obtain a hot-rolled sheet; optionally subjecting the hot-rolled sheet to hot band annealing; then subjecting the hot-rolled sheet to cold rolling either once, or twice or more with intermediate annealing performed therebetween, to obtain a steel strip; then subjecting the steel strip to decarburization annealing; then applying an annealing separator to the steel strip; and subsequently subjecting the steel strip to final annealing, wherein a linear groove is formed in a surface of the steel strip subjected to the cold rolling by applying the method as recited in claim 4 .

13 . A method for manufacturing a grain-oriented electrical steel sheet, comprising:
heating a silicon steel slab; then hot rolling the steel slab to obtain a hot-rolled sheet; optionally subjecting the hot-rolled sheet to hot band annealing; then subjecting the hot-rolled sheet to cold rolling either once, or twice or more with intermediate annealing performed therebetween, to obtain a steel strip; then subjecting the steel strip to decarburization annealing; then applying an annealing separator to the steel strip; and subsequently subjecting the steel strip to final annealing, wherein a linear groove is formed in a surface of the steel strip subjected to the cold rolling by applying the method as recited in claim 5 .

14 . The method for forming linear grooves on a steel strip according to claim 2 , wherein a thickness of the resist coating is set to 15 μm or less.

15 . The method for forming linear grooves on a steel strip according to claim 3 , wherein a thickness of the resist coating is set to 15 μm or less.

16 . The method for forming linear grooves on a steel strip according to claim 2 , wherein a gap between the mask member and the resist coating is set to 150 μm or less.

17 . The method for forming linear grooves on a steel strip according to claim 3 , wherein a gap between the mask member and the resist coating is set to 150 μm or less.

18 . The method for forming linear grooves on a steel strip according to claim 4 , wherein a gap between the mask member and the resist coating is set to 150 μm or less.

19 . The method for forming linear grooves on a steel strip according to claim 14 , wherein a gap between the mask member and the resist coating is set to 150 μm or l

Assignees

• Jfe Steel Corp

Inventors

• Kobayashi Hirokazu

Classifications

• H01F27/245

  made from sheets, e.g. grain-oriented (H01F27/26 takes precedence) · CPC title

• C22C2202/02

  Magnetic · CPC title

• C25F3/14 Primary

  locally · CPC title

• C21D9/46

  for sheet metals · CPC title

• C22C38/02

  containing silicon · CPC title