EP2555884A1 - Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller - Google Patents

Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller

Info

Publication number
EP2555884A1
EP2555884A1 EP11713251A EP11713251A EP2555884A1 EP 2555884 A1 EP2555884 A1 EP 2555884A1 EP 11713251 A EP11713251 A EP 11713251A EP 11713251 A EP11713251 A EP 11713251A EP 2555884 A1 EP2555884 A1 EP 2555884A1
Authority
EP
European Patent Office
Prior art keywords
rolling
strip
roll
rolled
hold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11713251A
Other languages
German (de)
French (fr)
Other versions
EP2555884B1 (en
Inventor
Christoph Klein
Frank Benfer
Ernst Windhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Siemag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2555884A1 publication Critical patent/EP2555884A1/en
Application granted granted Critical
Publication of EP2555884B1 publication Critical patent/EP2555884B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B21B31/12—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by vertically displacing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements

Definitions

  • the invention relates to a method for flying work roll change in cast rolling and hot strip mills, in particular continuous hot strip mills.
  • the work rolls of a rolling mill are subject to natural wear, which can lead to loss of quality at the surface of the rolled strip.
  • the object of the invention is to allow in a continuous casting or a continuous hot strip mill a flying work roll change, thereby shortening / eliminating the buffer times in the oven, a reduction of the furnace, a reduction of investment costs, as well as lower energy consumption and thus a cheaper product - tion process to come.
  • This object is achieved according to the invention with a method for flying work roll change in cast rolling mills and hot strip mills, in particular continuous hot strip mills, wherein for the exchange of beitswalzen by opening the roll stand these can be brought out of engagement with the hot rolled strip to be rolled, characterized in that on the rolled hot strip before and / or after entering the open mill stand via at least one insertable into the rolling line hold-down a controllable, the strip tension of the open Roll stand replacement strip tensioner can be applied.
  • the hold-down function is taken over by a hold-down roller, which interacts with the ski lift. Since the space between the rolling stands are very limited, this hold-down role is run in a particularly narrow design.
  • FIG. 1 shows the normal rolling process with the rolling stand closed
  • FIG. 2 shows the rolling process at a roll stand open for roll change and active hold-down roll and in FIG.
  • FIG. 3 shows a further hold-down roller active in the outlet region of the roll stand in order to reliably avoid contact of the strip with the upper work roll of the opened roll stand.

Abstract

The invention relates to a method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills, in particular continuous hot strip rolling mills, wherein, to exchange the working rolls by opening the roll stand (2), they can be disengaged from the hot strip to be rolled. According to the invention, a strip tension that can be regulated and substitutes the strip tension of the opened roll stand (2) can be applied to the hot strip (6) to be rolled, before and/or after it enters the opened roll stand (2), by means of at least one hold-down roller (5) that can be introduced into the rolling line.

Description

VERFAHREN UM FLIEGENDEN ARBEITSWALZENWECHSEL IN GIESSWALZANLAGEN UND WARMBANDSTRASSEN UNTER VERWENDUNG EINER NIEDERHALTEROLLE  METHOD OF FLYING WORKING ROLL CHANGING IN CASTING MACHINERY AND HOT WIRE ROPES USING A LOWER HOLDER
Die Erfindung betrifft ein Verfahren zum fliegenden Arbeitswalzenwechsel in Gießwalzanlagen und Warmbandstraßen , insbesondere kontinuierl ichen Warmbandstraßen . The invention relates to a method for flying work roll change in cast rolling and hot strip mills, in particular continuous hot strip mills.
Die Arbeitswalzen eines Walzwerkes unterliegen einem natürlichen Verschleiß, der zu Qualitätsverlusten an der Oberfläche des gewalzten Bandes führen kann. The work rolls of a rolling mill are subject to natural wear, which can lead to loss of quality at the surface of the rolled strip.
Um dies zu vermeiden, ist von Zeit zu Zeit ein Wechsel der Arbeitswalzen notwendig. Beim Warmwalzen muss das zu walzende Band vor dem Walzen auf die notwendige Temperatur erhitzt werden, es sei den es wird unmittelbar aus der Gießhitze gewalzt. To avoid this, a change of work rolls is necessary from time to time. During hot rolling, the strip to be rolled must be heated to the required temperature before being rolled, unless it is rolled directly from the casting heat.
Bei Verwendung eines kürzeren Ofens ohne Puffer oder bei Wegfall des Ofens aufgrund des vollkontinuierlichen Gießwalzens muss bei vollkontinuierlichem Walzbetrieb der Gießbetrieb für einen Wechsel der Arbeitswalzen angehalten werden. Damit ist ein Produktionsausfall nicht zu vermeiden. When using a shorter furnace without buffer or omission of the furnace due to the fully continuous casting rolling must be stopped in full-continuous rolling operation of the casting operation for a change of work rolls. This is a production loss can not be avoided.
Der vollkontinuierliche Gießwalzbetrieb mit langen Gießsequenzen ist nicht möglich ohne Qualitätsverlust an der Oberfläche des Bandes. Fully continuous casting rolling operation with long casting sequences is not possible without loss of quality at the surface of the strip.
Im Kaltwalzbetrieb ergeben sich diese Probleme nicht, d. h. hier wird das Band angehalten und dann der Walzenwechsel durchgeführt.  In cold rolling, these problems do not arise, i. H. Here the belt is stopped and then carried out the roll change.
Im CSP Endlosbetrieb ist dies nicht möglich, da der Gießprozess mit dem Walzprozess direkt gekoppelt ist und nicht angehalten werden kann. Würde der Gießprozess angehalten, würde dies sofort zum Gießabbruch führen und der Produktionsprozess würde unterbrochen. Daher ist es notwendig, falls ein Arbeitswalzenwechsel während des Gießens durchgeführt werden muss, diesen während des Walzens, d.h. also bei laufendem Band durchzuführen. Ein Walzenwechsel kann aber nur bei geöffnetem Walzgerüst erfolgen. In CSP continuous operation, this is not possible because the casting process is directly coupled with the rolling process and can not be stopped. If the casting process were stopped, this would immediately lead to the casting demolition and the production process would be interrupted. Therefore, if a work roll change must be performed during casting, it is necessary to perform it during rolling, that is, while the belt is running. A roll change can only be done with the mill stand open.
Würde das betroffene Walzgerüst geöffnet werden, so würde in diesem Walzgerüst nicht mehr gewalzt werden und damit keine Dickenabnahme mehr vorgenommen werden. Um dies zu kompensieren, müsste die Abnahme des ge- öffneten Walzgerüstes auf die umliegenden Walzgerüste verteilt werden, d.h. die im verbleibenden im Eingriff befindlichen Walzgerüste müssten während des Walzenwechsels zusätzlich die Walzarbeit des geöffneten Walzgerüstes übernehmen. Fehlen würde die Möglichkeit der Bandzugregelung, welche in einer kontinuierlichen Warmbandstraße von einem zwischen zwei aufeinander folgenden Walzgerüsten angeordneten Schiingenheber normalerweise übernommen wird. Dies wäre aufgrund des geöffneten Walzgerüstes nicht mehr möglich. Würde einer der vor oder hinter dem geöffneten Walzgerüst angeordneten Schiingenheber trotzdem aktiv, würde das Band gegebenenfalls an die obere Arbeitswalze des geöffneten Walzgerüstes gedrückt werden. In dem Fall wäre ein Arbeitswalzenwechsel nicht möglich. If the affected rolling stand were to be opened, rolling would no longer be carried out in this rolling stand and therefore no reduction in thickness would be made. In order to compensate for this, the decrease of the opened rolling stand would have to be distributed to the surrounding rolling stands, i. during the roll change, the rolling mills in the remaining meshing frame would additionally have to take over the rolling work of the opened roll stand. The possibility of strip tension regulation, which is normally taken over in a continuous hot strip mill by a loop lifter arranged between two successive rolling stands, would be missing. This would not be possible due to the open mill stand. If one of the slide lifters arranged in front of or behind the opened rolling stand were still active, the belt would possibly be pressed against the upper work roll of the opened rolling mill stand. In that case, a work roll change would not be possible.
Aufgabe der Erfindung ist es, in einer Gießwalzanlage oder einer kontinuierlich arbeitenden Warmbandstraße einen fliegenden Arbeitswalzenwechsel zu ermöglichen, um dadurch zu einer Verkürzung/Eliminierung der Pufferzeiten im Ofen, einer Kürzung des Ofens, einer Reduzierung der Investitionskosten, sowie geringerem Energieverbrauch und damit einem kostengünstigeren Produk- tionsprozess zu kommen. The object of the invention is to allow in a continuous casting or a continuous hot strip mill a flying work roll change, thereby shortening / eliminating the buffer times in the oven, a reduction of the furnace, a reduction of investment costs, as well as lower energy consumption and thus a cheaper product - tion process to come.
Gelöst wird diese Aufgabe erfindungsgemäß mit einem Verfahren zum fliegen- den Arbeitswalzenwechsel in Gießwalzanlagen und Warmbandstraßen, insbesondere kontinuierlichen Warmbandstraßen, wobei zum Austausch der Ar- beitswalzen durch Öffnen des Walzgerüstes diese außer Eingriff mit dem zu walzenden Warmband bringbar sind, dadurch, dass auf das zu walzende Warmband vor und/oder nach dem Eintritt in das geöffnete Walzgerüst über mindestens eine in die Walzlinie einführbare Niederhalterolle ein regelbare, den Bandzug des geöffneten Walzgerüstes ersetzender Bandzug aufbringbar ist. This object is achieved according to the invention with a method for flying work roll change in cast rolling mills and hot strip mills, in particular continuous hot strip mills, wherein for the exchange of beitswalzen by opening the roll stand these can be brought out of engagement with the hot rolled strip to be rolled, characterized in that on the rolled hot strip before and / or after entering the open mill stand via at least one insertable into the rolling line hold-down a controllable, the strip tension of the open Roll stand replacement strip tensioner can be applied.
Wird ein Walzgerüst zum Walzenwechsel geöffnet, muss die obere Arbeitswalze des geöffneten Walzgerüstes frei sein und kann das Band nicht mehr unten halten. Dieser Effekt könnte noch verstärkt werden, wenn der üblicherweise zwischen den Walzgerüsten angeordnete Schiingenheber das Warmband nach oben drücken würde. If a roll stand for roll change is opened, the upper work roll of the open roll stand must be free and can no longer hold the strip down. This effect could be exacerbated if the loop lifter usually placed between the rolling stands would push the hot strip upwards.
Um den Bandzug aufrecht zu erhalten, wird die Niederhaltefunktion von einer Niederhalterolle, die mit dem Schiingenheber zusammenwirkt, übernommen. Da die Platzverhältnisse zwischen den Walzgerüsten sehr eingeschränkt sind, ist diese Niederhalterolle in besonders schmaler Ausführung auszuführen.  In order to maintain the strip tension, the hold-down function is taken over by a hold-down roller, which interacts with the ski lift. Since the space between the rolling stands are very limited, this hold-down role is run in a particularly narrow design.
Es ist sinnvoll, während des Walzens eine Bandverfolgung durchzuführen. Diese dient der Identifizierung des Bandbereiches, welcher während des Walzenwechsels gewalzt wurde. Diese Information wird benötigt, wenn während des Walzenwechsels z.B. die Temperatur- oder Dickenregelung aus prozesstechni- sehen Gründen (Grenzen) oder z.B. aufgrund von Walzgerüstsetzfehlern nicht aufrecht erhalten werden konnte. Hierbei entsteht ein abzuwertendes bzw. zu verwerfendes Stück gewalzten Bandes, welches bei der Weiterverarbeitung von dem fehlerfreien Band zu trennen ist. Dies ist leichter möglich, wenn der Anfang und das Ende dieses fehlerbehafteten Bandbereiches bereits bekannt sind. It makes sense to perform a tape tracking during rolling. This serves to identify the band area, which was rolled during the roll change. This information is needed if, during the roll change, e.g. the temperature or thickness control for process-related reasons (limits) or e.g. could not be sustained due to rolling mill set failures. This results in a devalued or discarded piece rolled strip, which is to be separated in the further processing of the error-free tape. This is easier if the beginning and the end of this error band area are already known.
Beim Walzenwechsel ist im Übrigen zu berücksichtigen, dass die Temperaturführung während des Walzprozess bestehen bleibt. Um dies zu gewährleisten, sind ggf. Regulierung der Kühlung oder der Heizung innerhalb der Walzstraße während des Walzenwechselvorganges vorzunehmen. Das erfindungsgemäße Verfahren soll mit Bezug auf die Zeichnungen nachstehend erläutert werden. When changing the roll, it should be noted, moreover, that the temperature control remains during the rolling process. In order to ensure this, it may be necessary to regulate the cooling or heating within the rolling train during the roll changing operation. The method according to the invention will be explained below with reference to the drawings.
Dabei zeigt: Showing:
Figur 1 den normalen Walzvorgang bei geschlossenen Walzgerüst, FIG. 1 shows the normal rolling process with the rolling stand closed;
Figur 2 den Walzvorgang bei einem für den Walzenwechsel geöffneten Walzgerüst und aktiver Niederhalterolle und in FIG. 2 shows the rolling process at a roll stand open for roll change and active hold-down roll and in FIG
Figur 3 ist eine weitere Niederhalterolle im Auslaufbereich des Walzgerüstes aktiv, um einen Kontakt des Bandes zur oberen Arbeitswalze des geöffneten Walzgerüstes sicher zu vermeiden. FIG. 3 shows a further hold-down roller active in the outlet region of the roll stand in order to reliably avoid contact of the strip with the upper work roll of the opened roll stand.
Zwischen den Walzgerüsten 1 , 2 und 3 befinden sich die üblichen Schlingenhe- ber 4, über die der Bandzug zwischen den Walzgerüsten einstellbar ist. Beim normalen Walzvorgang, wie er in der Figur 1 dargestellt worden ist, ist weder die vor dem Walzgerüst 2 angeordnete Niederhalterolle 5 noch - falls vorhanden - die nach dem Walzgerüst angeordnete Niederhalterolle 5' im Eingriff mit dem Warmband 6. Um nun beispielsweise die Arbeitswalzen im mittleren Walzgerüst 2 zu wechseln, müssen die Walzen aufgefahren werden, wie dies die Figur 2 zeigt. Between the rolling stands 1, 2 and 3 are the usual loop 4 over which the strip tension between the rolling stands is adjustable. In the normal rolling operation, as shown in FIG. 1, neither the hold-down roller 5 arranged in front of the roll stand 2 is still present-if present - the hold-down roll 5 'arranged after the roll stand in engagement with the hot strip 6 To change medium rolling stand 2, the rollers must be driven up, as shown in the figure 2.
Da das Warmband dann mit den Arbeitswalzen keinen Kontakt mehr hat, bzw. haben darf, wird zumindest die vor dem Walzgerüst 2 vorgesehene Niederhalte- rolle 5 aktiv, und zwar zusammen mit dem dieser Niederhalterolle zugeordneten Schiingenheber 4, so dass das Warmband - ohne Berührung der Arbeitswalzen - durch das offene Walzgerüst mit dem entsprechenden Bandzug geführt werden kann. Der fliegende Wechsel der Arbeitswalzen selbst kann mit herkömmlichen Einrichtungen durchgeführt werden. So wird beispielsweise das Arbeitswalzenpaar mittels speziell ausgeformter Schienen im Walzgerüst während des Ausziehens bzw. Einschiebens in das Walzgerüst so geführt, dass sich die Oberwalze anhebt und beide Walzen das in der Straße befindliche Band nicht berühren. Since the hot strip then no longer has any contact with the work rolls, or at least the hold roll 5 provided in front of the roll stand 2 becomes active, together with the loop lifter 4 associated with this hold down roll, so that the hot strip - without touching the Work rolls - can be guided through the open rolling stand with the appropriate strip tension. The flying change of the work rolls themselves can be carried out with conventional means. Thus, for example, the pair of work rolls is guided by means of specially shaped rails in the rolling stand during the extraction or insertion into the rolling stand so that the upper roller lifts and both rollers do not touch the tape located in the street.
Vor dem Walzenwechsel erfolgt eine Walzprogrammänderung. Before the roll change, a rolling program change takes place.
Die Bandzugregelung zwischen den Walzgerüsten erfolgt durch die erfindungsgemäßen Niederhalterollen. The Bandzugregelung between the rolling stands done by the hold-down invention.
Es kann alternativ auch eine Wechselvorrichtung vor das zu wechselnde Walzgerüst gefahren werden. Auf der Vorrichtung sind die neuen Walzen abgelegt. Die alten Walzen werden aufgenommen und nach Querverschieben werden die neuen Walzen in das Walzgerüst geschoben. Alternatively, a changing device can be moved in front of the rolling stand to be changed. On the device, the new rollers are stored. The old rolls are picked up and after transverse shifting, the new rolls are pushed into the mill stand.

Claims

Ansprüche claims
1 . Verfahren zum fliegenden Arbeitswalzenwechsel in Gießwalzanlagen und Warmbandstraßen, insbesondere kontinuierlichen Warmbandstraßen, wobei zum Austausch der Arbeitswalzen durch Öffnen des Walzge- rüstes diese außer Eingriff mit dem zu walzenden Warmband bringbar sind, 1 . Method for flying work roll change in cast rolling mills and hot strip mills, in particular continuous hot strip mills, wherein the replacement of the work rolls by opening the rolling stand these can be brought out of engagement with the hot rolled strip to be rolled,
dadurch gekennzeichnet,  characterized,
dass auf das zu walzende Warmband vor und/oder nach dem Eintritt in das geöffnete Walzgerüst über mindestens eine in die Walzlinie einführ- bare Niederhalterolle ein regelbarer, den Bandzug des geöffneten Walzgerüstes ersetzender Bandzug aufbringbar ist.  in that on the hot rolled strip to be rolled prior to and / or after entry into the opened roll stand via at least one hold-down roll which can be introduced into the rolling line a controllable strip pull replacing the strip pull of the opened roll stand can be applied.
2. Verfahren nach Anspruch 1 , 2. The method according to claim 1,
dadurch gekennzeichnet,  characterized,
dass während des Walzens eine Bandverfolgung zur Identifizierung des that during rolling, a tape tracking to identify the
Bandbereiches, welcher während des Walzenwechsels gewalzt wurde, durchgeführt wird. Band range, which was rolled during the roll change is performed.
3. Verfahren nach einem der vorstehenden Ansprüche, 3. The method according to any one of the preceding claims,
dadurch gekennzeichnet,  characterized,
dass beim Walzenwechsel die Temperaturführung durch Regulierung der Kühlung oder der Heizung innerhalb der Walzstraße aufrechterhalten wird.  that during roll change the temperature control is maintained by regulation of the cooling or heating within the rolling train.
4. Verfahren nach einem der vorstehenden Ansprüche, 4. The method according to any one of the preceding claims,
dadurch gekennzeichnet,  characterized,
dass das zu walzende Warmband gemeinsam von der Niederhalterolle und einem zwischen den Walzgerüsten angeordneten Schiingenheber geführt wird.  in that the hot strip to be rolled is led together by the hold down roll and a loop lifter arranged between the roll stands.
EP11713251.4A 2010-04-09 2011-04-06 Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller Active EP2555884B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010014346A DE102010014346A1 (en) 2010-04-09 2010-04-09 Method for flying work roll change in cast rolling mills and hot strip mills
PCT/EP2011/055307 WO2011124585A1 (en) 2010-04-09 2011-04-06 Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller

Publications (2)

Publication Number Publication Date
EP2555884A1 true EP2555884A1 (en) 2013-02-13
EP2555884B1 EP2555884B1 (en) 2014-01-29

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EP11713251.4A Active EP2555884B1 (en) 2010-04-09 2011-04-06 Method for the flying changing of working rolls in continuous casting and rolling installations and hot strip rolling mills using a hold-down roller

Country Status (5)

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US (1) US8578749B2 (en)
EP (1) EP2555884B1 (en)
CN (1) CN102933325B (en)
DE (1) DE102010014346A1 (en)
WO (1) WO2011124585A1 (en)

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EP3208673B1 (en) 2016-02-22 2019-06-05 Primetals Technologies Austria GmbH In-line calibration of the roller gap of a roller stand
EP3208006B1 (en) 2016-02-22 2019-04-03 Primetals Technologies Austria GmbH In-line roll changing device in simple roller frame design
EP3670011B1 (en) * 2018-12-21 2022-09-28 Primetals Technologies Austria GmbH Cooling of metal strip in a rolling stand
AT522073B1 (en) * 2019-05-16 2020-08-15 Primetals Technologies Austria GmbH Hot rolling with flexible roll stand configuration
EP3851217B1 (en) 2020-01-15 2022-07-13 Primetals Technologies Germany GmbH Improved roll model adaptation

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Also Published As

Publication number Publication date
CN102933325B (en) 2015-04-15
CN102933325A (en) 2013-02-13
WO2011124585A1 (en) 2011-10-13
US8578749B2 (en) 2013-11-12
DE102010014346A1 (en) 2011-10-13
EP2555884B1 (en) 2014-01-29
US20130055782A1 (en) 2013-03-07

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