Notching equipment for steel strip, method of notching steel strip, cold rolling facility, and method of cold rolling

Patent metadata

Field	Value
Publication number	US-11065658-B2
Application number	US-201716077784-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Feb 17, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

Notching equipment for a steel strip, a method of notching a steel strip, a cold rolling equipment, and a method of cold rolling that make it possible to perform cold rolling on a material without weld breaks, even if the material is a brittle material or a high alloy material such as a silicon steel sheet or a high-tensile steel sheet with high Si and Mn contents. The notching equipment includes a shearing device and a grinding device. The shearing device performs shearing on both edge portions in the steel-strip width direction including the joint to form a first notch. The grinding device grinds end surfaces of both the edge portions of the joint in the steel-strip width direction to form a second notch.

First claim

The invention claimed is:

1. Notching equipment for a steel strip for forming notches at both edge portions of a joint in a steel-strip width direction, the joint at which a trailing end of a preceding steel strip and a leading end of a succeeding steel strip are joined to each other, the equipment comprising:
a shearing device that is configured to perform shearing on both edge portions in the steel-strip width direction including the joint to form a first notch; and
a grinding device that is configured to grind end surfaces of both the edge portions of the joint in the steel-strip width direction to form a second notch.

2. A cold rolling facility comprising:
the equipment according to claim 1 .

3. The equipment according to claim 1 , wherein the grinding device is configured to form the second notch entirely within the first notch.

4. The equipment according to claim 1 , wherein the grinding device is configured to remove work-hardened portions of the steel strips.

5. The equipment according to claim 1 , wherein the grinding device is configured to grind the end surfaces so that a difference between (i) the Vickers hardness of the end surfaces and (ii) the Vickers hardness of a base material portion of the steel strips is less than 50 HV, the base material portion being an inner portion of the steel strips separated from the end surfaces by 2 mm or more in the width direction.

6. Notching equipment for a steel strip for forming notches at both edge portions of a joint in a steel-strip width direction, the joint at which a trailing end of a preceding steel strip and a leading end of a succeeding steel strip are joined to each other, the equipment for notching comprising:
a grinding device that is configured to grind end surfaces of both edge portions in the steel-strip width direction including the joint to form notches.

7. A cold rolling facility comprising:
the equipment according to claim 6 .

8. The equipment according to claim 6 , wherein the grinding device is configured to grind the end surfaces so that a difference between (i) the Vickers hardness of the end surfaces and (ii) the Vickers hardness of a base material portion of the steel strips is less than 50 HV, the base material portion being an inner portion of the steel strips separated from the end surfaces by 2 mm or more in the width direction.

9. A method of notching a steel strip for forming notches at both edge portions of a joint in a steel-strip width direction where a trailing end of a preceding steel strip and a leading end of a succeeding steel strip are joined to each other, the method comprising the steps of:
performing shearing on both edge portions in the steel-strip width direction, including the joint, to form a first notch; and
thereafter, grinding end surfaces of both the edge portions of the joint in the steel-strip width direction to form a second notch.

10. A method of cold rolling comprising the steps of:
forming notches according to claim 9 ; and
thereafter, performing cold rolling.

11. The method according to claim 9 , wherein the second notch is formed entirely within the first notch.

12. The method according to claim 9 , wherein the grinding removes work-hardened portions of the steel strips.

13. The method according to claim 9 , wherein the end surfaces are grinded so that a difference between (i) the Vickers hardness of the end surfaces and (ii) the Vickers hardness of a base material portion of the steel strips is less than 50 HV, the base material portion being an inner portion of the steel strips separated from the end surfaces by 2 mm or more in the width direction.

14. The method according to claim 9 , wherein the steel strips each have a composition comprising Si in an amount in the range of from 1.0 mass % to 6.5 mass %.

15. The method according to claim 9 , wherein the steel strips each have a composition comprising Mn in an amount in the range of from 1.5 mass % to 20.0 mass %.

16. A method of notching a steel strip for forming notches at both edge portions of a joint in a steel-strip width direction where a trailing end of a preceding steel strip and a leading end of a succeeding steel strip are joined to each other, the method comprising the step of:
grinding end surfaces of both edge portions in the steel-strip width direction, including the joint, to form notches.

17. A method of cold rolling comprising the steps of:
forming the notches according to claim 16 ; and
thereafter, performing cold rolling.

18. The method according to claim 16 , wherein the end surfaces are grinded so that a difference between (i) the Vickers hardness of the end surfaces and (ii) the Vickers hardness of a base material portion of the steel strips is less than 50 HV, the base material portion being an inner portion of the steel strips separated from the end surfaces by 2 mm or more in the width direction.

19. The method according to claim 16 , wherein the steel strips each have a composition comprising Si in an amount in the range of from 1.0 mass % to 6.5 mass %.

20. The method according to claim 16 , wherein the steel strips each have a composition comprising Mn in an amount in the range of from 1.5 mass % to 20.0 mass %.

Assignees

• Jfe Steel Corp

Inventors

• Matsubara Yukihiro
• NAGAI Yuu
• Iwanaga Kazuhisa

Classifications

• B21B15/0085 Primary

  Joining ends of material to continuous strip, bar or sheet · CPC title

• B21B15/00

  Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills · CPC title

• B21B1/22 Primary

  for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence) · CPC title

• B21B2015/0021

  in the rolling direction · CPC title

• B21B2015/0092

  Welding in the rolling direction · CPC title