Cold rolling mill with alternative feed of a steel strip over two different paths

Patent metadata

Field	Value
Publication number	US-2022184676-A1
Application number	US-202017602316-A
Country	US
Kind code	A1
Filing date	Apr 15, 2020
Priority date	Apr 18, 2019
Publication date	Jun 16, 2022
Grant date	—

Abstract

A first steel strip and a second steel strip ( 7 ) are rolled in succession in at least one roll stand ( 1 ) of a cold rolling mill. A rolling pause, in which no steel strip is rolled, is provided between the rolling of the first and the second steel strip ( 7 ). The first steel strip s fed over a first path starting from a first pay-off reel ( 2 ), and the second steel strip ( 7 ) is fed over a second path starting from the first pay-off reel ( 2 ), or from a second pay-off reel different from the first pay-off reel ( 2 ). The first steel strip is not heated as it is fed to the rolling mill ( 1 ), whereas, by contrast, the second steel strip ( 7 ) is heated. The second path is longer than the first path.

First claim

1 . A method for operating a cold rolling mill, comprising:
wherein a first steel strip and a second steel strip are rolled in at least one roll stand of the cold rolling mill, wherein there is a pause in rolling, in which no steel strip is rolled, between the rolling of the first steel strip and the rolling of the second steel strip; wherein starting from a first uncoiling reel, the first steel strip is fed to the roll stand via a first path and is not heated while it is being fed to the roll stand; wherein starting from the first uncoiling reel or a second uncoiling reel which is different than the first uncoiling reel, the second steel strip is fed to the roll stand via a second path and is heated while it is being fed to the roll stand; and wherein the second path is longer than the first path.

2 . The operating method as claimed in claim 1 , further comprising heating the second steel strip by means of an induction heater.

3 . The operating method as claimed in claim 1 , further comprising:
starting from the first or the second uncoiling reel, initially moving toward the roll stand, but the initial moving toward the roll stand is ended before a head of the second steel strip arrives at the roll stand; then placing the heating device against the second steel strip, causing the heating device, as viewed in the transport direction of the second steel strip, to be located at a portion of the second steel strip that has already been uncoiled at this time, and only then continuing the moving of the second steel strip toward the roll stand, such that a head of the strip arrives at the roll stand and is taken up by the roll stand.

4 . The operating method as claimed in claim 3 , further comprising:
moving the second steel strip somewhat away from the roll stand between the placement of the heating device against the second steel strip and subsequently continuing the moving of the second steel strip toward the roll stand, wherein the head of the second steel strip stops at the outlet of the heating device.

5 . A cold rolling mill, comprising:
the cold rolling mill has a roll stand for rolling a first steel strip immediately after the first steel strip has been uncoiled from a first uncoiling reel; and a second steel strip is rolled immediately after the second steel strip has been uncoiled from the first uncoiling reel or from a second uncoiling reel which is different than the first uncoiling reel; starting from the first uncoiling reel, the cold rolling mill has a first path, via which, the first steel strip reel can be fed to the roll stand; no heating device for heating the first steel strip is arranged in the first path, so that the first steel strip is fed to the roll stand at that temperature of the first steel strip at which the first steel strip is uncoiled from the first uncoiling reel; the cold rolling mill has a second path, starting from the first or second uncoiling reel, the second steel strip can be fed to the roll stand; a heating device for heating the second steel strip is arranged in the second path, so that the second steel strip is fed to the roll stand at a temperature which is higher than that temperature of the second steel strip and at which the second steel strip is uncoiled from the first or second uncoiling reel; and the second path is longer than the first path.

6 . The cold rolling mill as claimed in claim 5 , further comprising:
the second steel strip is uncoiled from the first uncoiling reel; the first uncoiling reel is arranged on a movable platform, and the platform can be positioned at least in a first position and a second position; the first uncoiling reel is arranged closer to the roll stand in the first position of the platform than in the second position of the platform for causing the first path to extend from the first uncoiling reel to the roll stand while the platform is in the first position, and for causing the second path to extend from the first uncoiling reel to the roll stand while the platform is in the second position; and at least whenever the movable platform is in the second position, the heating device can be placed against the second steel strip parallel to the second steel strip, but transversely in relation to a transport direction of the second steel strip from the first uncoiling reel to the roll stand, or the heating device can be placed against the second steel strip orthogonally in relation to the second steel strip.

7 . The cold rolling mill as claimed in claim 5 , further comprising:
the second steel strip is uncoiled from the first uncoiling reel; loop lifter is arranged between the first uncoiling reel and the roll stand; the first steel strip passes through the loop lifter without deflection in a first positioning of the loop lifter and the second steel strip passes through the loop lifter in a second positioning of the loop lifter to form a loop, whereby the first path extends from the first uncoiling reel to the roll stand without forming a loop and the second path extends from the first uncoiling reel to the roll stand with formation of the loop; at least whenever the loop lifter is in the second position, the heating device can be placed against the second steel strip in the region of the loop parallel to the second steel strip, but transversely in relation to a transport direction of the second steel strip in the region of the loop.

8 . The cold rolling mill as claimed in claim 5 , further comprising:
the second steel strip is uncoiled from the second uncoiling reel; a driver device is arranged upstream of the roll stand, such that the first path extends from the first uncoiling reel, via the driver device, to the roll stand and the second path extends from the second uncoiling reel, via the driver device, to the roll stand; and the heating device is arranged between the second uncoiling reel and the driver device.

9 . The cold rolling mill as claimed in claim 8 , further comprising:
the heating device can be placed against the second steel strip parallel to the second steel strip, but transversely in relation to a transport direction of the second steel strip from the second uncoiling reel to the driver device, or the heating device can be placed against the second steel strip orthogonally in relation to the second steel strip.

10 . The cold rolling mill as claimed in claim 5 , further comprising the heating device is in the form of an induction heater.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Kellermayr Roland
• Krimpelstaetter Konrad
• Stadlbauer Alois

Classifications

• B21B1/22 Primary

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

• B21B39/084

  Looper devices · CPC title

• B21B3/02

  Rolling special iron alloys {, e.g. stainless steel} · CPC title

• B21B2273/14

  Front end or leading end · CPC title

• B21B1/30 Primary

  in a non-continuous process {(B21B1/224 takes precedence)} · CPC title