Method for continuous electrolytic etching of grain oriented electrical steel strip and apparatus for continuous electrolytic etching of grain oriented electrical steel strip

Patent metadata

Field	Value
Publication number	US-2018030612-A1
Application number	US-201615550266-A
Country	US
Kind code	A1
Filing date	Feb 9, 2016
Priority date	Mar 4, 2015
Publication date	Feb 1, 2018
Grant date	—

Abstract

Method for continuous electrolytic etching of a grain oriented electrical steel strip includes: forming an etch mask on a surface of a grain oriented electrical steel strip cold-rolled to final thickness with a linear exposed portion exposed from the etch mask; centering the grain oriented electrical steel strip with a position sensor and centering apparatus, which are placed immediately upstream of an electrolytic etching apparatus; and performing an electrolytic etching process in which electrolytic etching is performed in the electrolytic etching apparatus to form a linear groove on the surface of the grain oriented electrical steel strip by passing electric current between a conductor roll and electrode placed in an electrolytic bath while the grain oriented electrical steel strip is brought into contact with the conductor roll, the grain oriented electrical steel strip is immersed in the electrolytic bath and the grain oriented electrical steel strip is facing the electrode.

First claim

1 . A method for continuous electrolytic etching of a grain oriented electrical steel strip, the method comprising:
a mask formation step of forming an etch mask on a surface of a grain oriented electrical steel strip cold-rolled to final thickness with a linear exposed portion exposed from the etch mask; a centering step of centering the grain oriented electrical steel strip with a position sensor and a centering apparatus, which are placed immediately upstream of an electrolytic etching apparatus; and a groove formation step of performing an electrolytic etching process in which electrolytic etching is performed in the electrolytic etching apparatus to form a linear groove on the surface of the grain oriented electrical steel strip by passing electric current between a conductor roll and an electrode placed in an electrolytic bath while the grain oriented electrical steel strip is brought into contact with the conductor roll, the grain oriented electrical steel strip is immersed in the electrolytic bath and the grain oriented electrical steel strip is facing the electrode.

2 . The method for continuous electrolytic etching of a grain oriented electrical steel strip according to claim 1 , wherein the groove formation step includes performing the electrolytic etching process using the electrode whose width is within ±10 mm of a steel strip width of the grain oriented electrical steel strip.

3 . The method for continuous electrolytic etching of a grain oriented electrical steel strip according to claim 1 , wherein the groove formation step includes performing the electrolytic etching process using the electrode whose side surface in the width direction is covered with an insulating material.

4 . An apparatus for continuous electrolytic etching of a grain oriented electrical steel strip, the apparatus comprising:
a mask-forming apparatus configured to form an etch mask on a surface of a grain oriented electrical steel strip cold-rolled to final thickness with a linear exposed portion being exposed from the etch mask; an electrolytic etching apparatus including an electrolytic bath, an electrode placed in the electrolytic bath, and a conductor roll, the electrolytic etching apparatus performing an electrolytic etching process in which electrolytic etching is performed to form a linear groove on the surface of the grain oriented electrical steel strip by passing electric current between the conductor roll and the electrode while the grain oriented electrical steel strip is brought into contact with the conductor roll, the grain oriented electrical steel strip is immersed in the electrolytic bath, and the grain oriented electrical steel strip is facing the electrode; a position sensor, placed immediately upstream of the electrolytic etching apparatus, to detect a position of the grain oriented electrical steel strip in a width direction; and a centering apparatus, placed immediately upstream of the electrolytic etching apparatus, to center the grain oriented electrical steel strip on the basis of a detection result of the position sensor.

5 . The method for continuous electrolytic etching of a grain oriented electrical steel strip according to claim 2 , wherein the groove formation step includes performing the electrolytic etching process using the electrode whose side surface in the width direction is covered with an insulating material.

Assignees

• Jfe Steel Corp

Inventors

• Matsuda Kenji

Classifications

• C21D8/12

  during manufacturing of articles with special electromagnetic properties · CPC title

• C25F3/14 Primary

  locally · CPC title

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D2201/05

  Grain orientation · CPC title