EP0327855B1 - Installation for rolling strip immediately behind the continuous casting installation - Google Patents

Installation for rolling strip immediately behind the continuous casting installation Download PDF

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Publication number
EP0327855B1
EP0327855B1 EP19890100928 EP89100928A EP0327855B1 EP 0327855 B1 EP0327855 B1 EP 0327855B1 EP 19890100928 EP19890100928 EP 19890100928 EP 89100928 A EP89100928 A EP 89100928A EP 0327855 B1 EP0327855 B1 EP 0327855B1
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EP
European Patent Office
Prior art keywords
roll
roll stand
speed
stand
casting
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EP19890100928
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German (de)
French (fr)
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EP0327855A2 (en
EP0327855A3 (en
Inventor
Heinrich Bohnenkamp
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SMS Siemag AG
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SMS Schloemann Siemag AG
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Priority claimed from DE3812102A external-priority patent/DE3812102A1/en
Application filed by SMS Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT89100928T priority Critical patent/ATE75168T1/en
Publication of EP0327855A2 publication Critical patent/EP0327855A2/en
Publication of EP0327855A3 publication Critical patent/EP0327855A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling

Definitions

  • the invention relates to a system for rolling continuously cast metal strip from the casting heat with the rolling mill immediately preceding continuous casting system. Since such a system makes reheating of the continuously cast metal strip before further processing by rolling superfluous and thus promises significant advantages in terms of energy expenditure, numerous proposals for the design of such systems have been known since the beginning of development in the field of continuous casting technology. In practice, however, "rolling from the pouring heat" has not been successful. One reason for this may be that, because of the continuity of the continuous casting, a continuous mode of operation also seemed necessary for the rolling mill.
  • the invention has set itself the task of reducing the space requirement for a rolling mill immediately downstream of a continuous casting plant.
  • a known coreless winding machine (DE-PS 11 58 024) is arranged, which takes up the reduced metal strip in the first pass with casting speed.
  • a reversible bending and driving roller set of the coreless winding machine By means of a reversible bending and driving roller set of the coreless winding machine, the rolled up and thus stored metal strip can be moved out of the winding machine again, whereby means are provided to feed the metal strip again to the first rolling stand or stands, which can now be operated with increased rolling speed, preferably in continuous rolling with subordinate finishing stands.
  • the storability of a continuously cast metal strip reduced in one or a few first pass passes initially has the advantage that a metal strip can be kept warm in the case of faults in the continuous casting installation or in the rolling mill, such as in a furnace reel.
  • the primary task of the coreless reel-up in connection with the upstream guide, which can be pivoted about a horizontal axis, is to store the reduced metal strip for a short time with the least possible radiation losses, and then to use the reversible bending and driving rollers and the pivoted guide to reassemble the first roll stand in order to then be able to carry out the second rolling pass or the second series of passes (in the case of a continuous preliminary stage as the first rolling stands) with the same rolling stands that have mastered the first pass or the first series of passes.
  • the return of the rolling stock also eliminates the need for a reversing drive for the first rolling stand or stands, which leads to an advantageously compact construction of the rolling mill.
  • the first or the first roll stands suitably consist of duo roll stands.
  • the rolling mill according to the invention because of the intermediate storage in a coreless reeling machine, can only process the preliminary strip that is supplied by a discontinuously operating continuous caster, in dimensions that take into account the decrease in the first or the first passes of the rolling mill Take up capacity of the coreless rewinder.
  • the basic idea of the invention which can ultimately be seen in the double pass of at least one first roll stand of a rolling mill, can also be realized with continuous feeding of cut partial lengths of a fully continuously cast metal strip, the partial lengths of which follow one another directly.
  • roller table rollers are either provided with a freewheel that overtakes the set speed (claim 4), or the speed of these roller table rollers can be changed over to higher speed according to claim 5, the reversal via photocells or limit switches can be triggered by the completion of the separating cuts, according to which, however, when the roller table rollers are individually driven, the same and the rear cutting edge of a part length moving at the piercing speed are quasi retroactively controlled to the casting speed in order to carry an incoming part length non-slip during the separating cut.
  • the additive reverse control can be triggered by means of photocells arranged between the roller table rollers, or - more simply - derived from the drop in power consumption of the roller table motors.
  • outlet roller table section upstream of the first roll stand as a continuous furnace, but this is not the object of the protection.
  • the rolling mill shown has a single first duo roll stand 1, which is followed by a coreless winding machine 2.
  • This coreless winding machine has a system of circularly arranged winding rollers 3 for receiving a tape 4 which, under the influence of a reversibly driven bending and driving roller set 5, can be rolled up within the winding space enclosed by the winding rollers 3 and also moved out of the winding machine again, as in DE-PS 11 58 024 described for a hot plate rolling mill.
  • Coreless unwinding is an option if a rolled strip is still too thick to be wound up in a reel on a winding mandrel.
  • the rolling mill shown comprises a finishing line with two four-high rolling stands 6, 7.
  • the coreless rewinder 2 is offset from the common to all the rolling stands 8, for the following reasons: the coreless rewinder 2 is a funnel-like guide 9 upstream, which is arranged pivotably about a horizontal axis 10 upstream of the bending and driving roller set 5.
  • the guide 9 leads the metal strip 4, which is reduced in the DUO roll stand 1, from the rolling line 8 into the coreless winding machine 2.
  • the pivotable guide 9 is in the dash-dotted lower pivot position 9 'directed to a DUO roll stand 1 assigned bypass 11, which extends up to the roll gap of the duo roll stand 1.
  • the entire system according to FIG. 1 shows a continuous arc casting system 13 with an outfeed roller table 14 which extends to the first DUO mill stand 1.
  • the run-out roller table 14 is assigned a flame cutting machine 15, which can be moved over a travel distance F in order to subdivide continuously cast metal strip while the casting strand is being advanced. 1, the flame cutting machine 15 is at the end of the travel path F required for the separating cut.
  • the length L R of the roller table section 14a upstream of the first roll stand 1 from the end of the travel path F of the flame cutting machine 15 required for the separating cut to the first roll stand 1 is somewhat greater than that of the capacity of the take-up machine 2, taking into account the decrease in the first roll stand 1 certain part length L of the upstream side strip 12. This part length has run out freely before tapping in the roll stand 1, so that the tapping speed for this first roll stand can be higher than the casting speed of the continuous caster 13.
  • FIG. 2 To describe the mode of operation of the system according to the invention, reference is first made to FIG. 2.
  • the preliminary strip 12 coming from the continuous casting plant runs into the DUO roll stand 1 and is reduced there to the metal strip 4 in a first strong rolling pass, which is deflected downward from the rolling line 8 by means of the pivoted funnel-like guide 9 and the bending and driving roller set 5 is fed.
  • the metal strip 4 is given a curvature which enables the strip to be wound without a core within the system of the winding rolls 3.
  • the coreless Rewinder 2 the reduced and still relatively thick metal strip 4 is kept warm during the first roll pass.
  • the coreless winding machine 2 can therefore also be heated.
  • the metal strip 4 is moved out of the reeling machine 2 by means of the bending and driving roller set 5 and straightened again, the funnel-like guide 9 having been pivoted into the pivot position 9 corresponding to the bypass 11 '.
  • the reduced metal strip 4 is fed again to the duo roll stand 1 in order to be further reduced in a second pass without reversing this roll stand.
  • the rolling speed of the roll stand 1 (and accordingly the speed of the reversed bending and driving rollers 5) is increased as much as possible to the band 4 after the second reduction in the DUO roll stand 1 in the Finished mill stands 6 and 7 ready to be rolled.
  • a thickness measurement and descaling of the rolling stock can take place in the area between the first rolling stand 1 and the finishing stands 6, 7.
  • a piercing speed of 0.5 m / s is sufficient for the first roll stand 1 to cut a cut partial length of the preliminary strip 12 using the reeling machine 2 twice through the roll stand before the casting strand continuously advanced at the casting speed reaches the roll stand 1. If the roller table rollers of this roller table section 14a are set in their rotational speed to the low casting speed, the severed pre-strip 12 would, after tapping in the roll stand 1, have a tapping speed of five or more times grind the roller table rollers. To prevent this, the roller table rollers can be provided with a freewheel that overtakes the low speed in accordance with the casting speed.
  • Another possibility of a slip-free transport of the incoming casting strand or the running partial lengths can be achieved in that the speed of the roller table rollers of the roller table section 14a is derived from signals that indicate the completion of a separating cut by the flame cutting machine 15 from the casting speed of the Continuous caster 13 corresponding speed to the higher speed corresponding to the tapping speed of the first roll stand 1 can be reversed, whereby - since after each separating stitch the casting strand runs onto the outlet roller table section 14a at the casting speed - the roller table rollers of this section receive individual drives and the drives after the reversal the higher tapping speed starting with the first roller table roll is controlled back to the low speed corresponding to the casting speed. In this way, all roller table rollers always have the speed that corresponds to the feed speed of the material currently resting on them.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Description

Die Erfindung betrifft eine Anlage zum Walzen von stranggegossenem Metallband aus der Gießhitze mit dem Walzwerk unmittelbar vorgeordneter Stranggießanlage. Da eine derartige Anlage eine Wiedererwärmung des stranggegossenen Metallbandes vor der Weiterverarbeitung durch Walzen überflüssig macht und somit vom Energieaufwand her bedeutende Vorteile verspricht, sind zahlreiche Vorschläge über die Auslegung derartiger Anlagen schon seit Beginn der Entwicklung auf dem Gebiet der Stranggießtechnik bekanntgeworden. In der Praxis hat sich das "Walzen aus der Gießhitze" jedoch nicht durchsetzen können. Ein Grund hierfür mag darin zu suchen sein, daß wegen der Kontinuität des Stranggießens auch für das Walzwerk eine kontinuierliche Arbeitsweise erforderlich erschien. Wegen der gegenseitigen funktionellen Abhängigkeit von Stranggießanlage und Walzwerk und der damit verbundenen Gefahren wegen Ausfallzeiten durch Betriebsstörungen in Verbindung mit dem Platzbedarf für eine kontinuierliche Walzenstraße und dem zu erwartenden Temperaturverlust stößt eine Realisierung des Gedankens "Walzen aus der Gießhitze" noch auf Widerstände.The invention relates to a system for rolling continuously cast metal strip from the casting heat with the rolling mill immediately preceding continuous casting system. Since such a system makes reheating of the continuously cast metal strip before further processing by rolling superfluous and thus promises significant advantages in terms of energy expenditure, numerous proposals for the design of such systems have been known since the beginning of development in the field of continuous casting technology. In practice, however, "rolling from the pouring heat" has not been successful. One reason for this may be that, because of the continuity of the continuous casting, a continuous mode of operation also seemed necessary for the rolling mill. Due to the mutual functional dependency of the continuous caster and rolling mill and the associated dangers due to downtimes due to operational malfunctions in connection with the space required for a continuous roll train and the expected temperature loss, the realization of the idea "rolling from the casting heat" still meets with resistance.

Die Erfindung hat sich die Aufgabe gestellt, den Platzbedarf für ein einer Stranggießanlage unmittelbar nachgeordnetes Walzwerk zu verringern.The invention has set itself the task of reducing the space requirement for a rolling mill immediately downstream of a continuous casting plant.

Die Lösung dieser Aufgabe besteht aus den kennzeichnenden Merkmalen des Patentanspruches 1. Hiernach wird dem oder den ersten Walzgerüsten eine an sich bekannte kernlose Aufwickelmaschine (DE-PS 11 58 024) nachgeordnet, die das im ersten Walzstich mit Gießgeschwindigkeit reduzierte Metallband aufnimmt. Mittels eines reversierbaren Biegeund Treibrollensatzes der kernlosen Aufwickelmaschine kann das aufgerollte und somit gespeicherte Metallband wieder aus der Aufrollmaschine herausbewegt werden, wobei Mittel vorgesehen sind, um das Metallband erneut dem oder den ersten Walzgerüsten zuzuführen, das bzw. die nunmehr mit erhöhter Walzgeschwindigkeit betreibbar sind, vorzugsweise im kontinuierlichen Walzbetrieb mit nachgeordneten Fertiggerüsten.The solution to this problem consists of the characterizing features of patent claim 1. According to the first or the first rolling stands, a known coreless winding machine (DE-PS 11 58 024) is arranged, which takes up the reduced metal strip in the first pass with casting speed. By means of a reversible bending and driving roller set of the coreless winding machine, the rolled up and thus stored metal strip can be moved out of the winding machine again, whereby means are provided to feed the metal strip again to the first rolling stand or stands, which can now be operated with increased rolling speed, preferably in continuous rolling with subordinate finishing stands.

Die Speicherbarkeit eines in einem oder wenigen ersten Walzstichen reduzierten stranggegossenen Metallbandes hat zunächst den Vorteil, daß ein Metallband bei Störungen in der Stranggießanlage oder im Walzwerk wie in einem Ofenhaspel warmgehalten werden kann. Primär hat die kernlose Aufrollmaschine in Verbindung mit der vorgeordneten, um eine waagerechte Achse schwenkbare Führung die Aufgabe, das reduzierte Metallband unter möglichst geringen Abstrahlverlusten nur kurzzeitig zu speichern, um es dann über die reversierbaren Biege- und Treibrollen und die verschwenkte Führung dem ersten Walzgerüst erneut zuzuführen, um dann den zweiten Walzstich oder die zweite Stichserie (bei einer Konti-Vorstaffel als erste Walzgerüste) mit den gleichen Walzgerüsten ausführen zu können, die den ersten Stich oder die erste Stichserie bewältigt haben. Durch die Walzgutrückführung erübrigt sich zudem ein Reversierantrieb für das oder die ersten Walzgerüste, was zu einer vorteilhaft kompakten Bauweise des Walzwerkes führt.The storability of a continuously cast metal strip reduced in one or a few first pass passes initially has the advantage that a metal strip can be kept warm in the case of faults in the continuous casting installation or in the rolling mill, such as in a furnace reel. The primary task of the coreless reel-up in connection with the upstream guide, which can be pivoted about a horizontal axis, is to store the reduced metal strip for a short time with the least possible radiation losses, and then to use the reversible bending and driving rollers and the pivoted guide to reassemble the first roll stand in order to then be able to carry out the second rolling pass or the second series of passes (in the case of a continuous preliminary stage as the first rolling stands) with the same rolling stands that have mastered the first pass or the first series of passes. The return of the rolling stock also eliminates the need for a reversing drive for the first rolling stand or stands, which leads to an advantageously compact construction of the rolling mill.

Das oder die ersten Walzgerüste bestehen zweckmäßig aus Duo-Walzgerüsten.The first or the first roll stands suitably consist of duo roll stands.

Soweit bisher beschrieben, vermag das Walzwerk gemäß der Erfindung wegen der Zwischenspeicherung in einer kernlosen Aufrollmaschine nur Vorband zu verarbeiten, das von einer diskontinuierlich arbeitenden Stranggießanlage angeliefert wird, und zwar in Abmessungen, die unter Berücksichtigung der Abnahme in dem oder den ersten Stichen des Walzwerkes der Aufnahmekapazität der kernlosen Aufwickelmaschine entsprechen. Der Grundgedanke der Erfindung, der letztlich in dem zweifachen Durchlauf mindestens eines ersten Walzgerüstes eines Walzwerkes zu sehen ist, kann jedoch auch realisiert werden bei kontinuierlicher Zuführung von geschnittenen Teillängen eines vollkontinuierlich stranggegossenen Metallbandes, deren Teillängen unmittelbar aufeinander folgen. Für diesen Fall empfiehlt sich die Auslegung des mit einer fahrbaren Brennschneidemaschine versehenen Auslaufrollganges der Stranggießanlage nach Patentanspruch 3, womit ein freier Auslauf der Teillängen sichergestellt ist mit der Folge, daß die Anstichgeschwindigkeit für das erste Walzgerüst gegenüber der Gießgeschwindigkeit der Stranggießanlage soweit erhöht werden kann, daß trotz einer zweimaligen Inanspruchnahme des ersten Walzgerüstes für ein und dieselbe Teillänge die nachfolgende Teillänge des Metallbandes das Walzwerk erst erreicht, wenn der zweite Durchlauf beendet ist. Der dem ersten Walzgerüst vorgeordnete Rollgangsabschnitt braucht daher nur geringfügig länger zu sein als die maximal zu schneidende Teillänge.As far as described so far, the rolling mill according to the invention, because of the intermediate storage in a coreless reeling machine, can only process the preliminary strip that is supplied by a discontinuously operating continuous caster, in dimensions that take into account the decrease in the first or the first passes of the rolling mill Take up capacity of the coreless rewinder. However, the basic idea of the invention, which can ultimately be seen in the double pass of at least one first roll stand of a rolling mill, can also be realized with continuous feeding of cut partial lengths of a fully continuously cast metal strip, the partial lengths of which follow one another directly. In this case, it is advisable to design the run-out roller table of the continuous casting installation provided with a mobile flame cutting machine, whereby a free run-out of the partial lengths is ensured, with the result that the piercing speed for the first roll stand can be increased compared to the casting speed of the continuous casting installation to such an extent that in spite of two uses of the first roll stand for one and the same partial length, the subsequent partial length of the metal strip only reaches the rolling mill when the second pass has ended. The roller table section upstream of the first roll stand therefore only needs to be slightly longer than the maximum partial length to be cut.

Wenn jedoch bei kürzestmöglicher Länge des dem ersten Walzgerüst unmittelbar vorgeordneten Auslaufrollgangs-Abschnittes dessen Rollgangsrollen in ihrer Drehzahl auf Gießgeschwindigkeit eingestellt sind, unter der die Trennschnitte erfolgen, würde die Gefahr bestehen, daß von dem Augenblick an, zu dem eine Teillänge mit erhöhter Anstichgeschwindigkeit im ersten Walzgerüst ansticht, das vom Walzgerüst eingezogene Band über die Rollgangsrollen schleift und deren Rollenmäntel verschleißen. Um dem zu begegnen, wird gemäß der Erfindung vorgeschlagen, daß die Rollgangsrollen entweder mit einem die eingestellte Drehzahl überholenden Freilauf versehen sind (Patentanspruch 4), oder die Drehzahl dieser Rollgangsrollen nach Patentanspruch 5 auf höhere Drehzahl umsteuerbar ist, wobei die Umsteuerung über Fotozellen oder Endschalter von der Vollendung der Trennschnitte ausgelöst werden kann, wonach jedoch bei Einzelantrieb der Rollgangsrollen dieselben additiv und der rückwärtigen Schneidkante einer mit Anstichgeschwindigkeit bewegten Teillänge quasi nachlaufend auf Gießgeschwindigkeit rückgesteuert werden, um eine einlaufende Teillänge während des Trennschnittes rutschfrei zu tragen.If, however, with the shortest possible length of the outlet roller table section immediately upstream of the first roll stand, its roller table rollers are set in their speed to the casting speed below which the separating cuts would take place, there would be the danger that, from the moment a part length with a higher piercing speed in the first roll stand, the strip drawn in by the roll stand would drag over the roller table rollers and their roller jackets would wear out. In order to counter this, it is proposed according to the invention that the roller table rollers are either provided with a freewheel that overtakes the set speed (claim 4), or the speed of these roller table rollers can be changed over to higher speed according to claim 5, the reversal via photocells or limit switches can be triggered by the completion of the separating cuts, according to which, however, when the roller table rollers are individually driven, the same and the rear cutting edge of a part length moving at the piercing speed are quasi retroactively controlled to the casting speed in order to carry an incoming part length non-slip during the separating cut.

Die additive Rücksteuerung kann über zwischen den Rollgangsrollen angeordnete Fotozellen ausgelöst werden, oder - einfacher - in Ableitung von dem Abfall der Leistungsaufnahme der Rollgangsmotoren.The additive reverse control can be triggered by means of photocells arranged between the roller table rollers, or - more simply - derived from the drop in power consumption of the roller table motors.

Zur Homogenisierung der Temperatur innerhalb der stranggegossenen Teillängen ist es vorteilhaft, den dem ersten Walzgerüst vorgeordneten Auslaufrollgangs-Abschnitt als Durchlaufofen auszugestalten, was jedoch nicht Gegenstand des Schutzes ist.To homogenize the temperature within the continuously cast partial lengths, it is advantageous to design the outlet roller table section upstream of the first roll stand as a continuous furnace, but this is not the object of the protection.

In der Zeichnung ist ein Ausführungsbeispiel einer Anlage gemäß der Erfindung dargestellt, und zwar zeigen

  • Fig. 1 eine schematische Gesamtdarstellung einer Stranggießanlage mit dem ersten Walzgerüst eines nachgeordneten Walzwerkes, und
  • Fig. 2 in vergrößerter Darstellung das Walzwerk mit kernloser Aufrollmaschine und Rückführung.
In the drawing, an embodiment of a system according to the invention is shown, namely show
  • Fig. 1 is a schematic overall representation of a continuous caster with the first roll stand of a downstream rolling mill, and
  • Fig. 2 in an enlarged view the rolling mill with coreless reel-up and feedback.

Wie aus Fig. 2 ersichtlich, hat das dargestellte Walzwerk ein einziges erstes Duo-Walzgerüst 1, dem eine kernlose Aufwickelmaschine 2 nachgeordnet ist. Diese kernlose Aufwickelmaschine hat ein System von kreisförmig angeordneten Wickelrollen 3 zur Aufnahme eines Bandes 4, das unter dem Einfluß eines reversierbar angetriebenen Biege- und Treibrollensatzes 5 innerhalb des von den Wickelrollen 3 umschlossenen Wickelraumes aufgerollt und auch wieder aus der Wickelmaschine herausbewegt werden kann, wie in der DE-PS 11 58 024 für ein Warmblech-Walzwerk beschrieben. Das kernlose Auswickeln kommt dann infrage, wenn ein Walzband noch zu dick ist, um in einem Haspel auf einem Wickeldorn aufgewickelt zu werden.As can be seen from FIG. 2, the rolling mill shown has a single first duo roll stand 1, which is followed by a coreless winding machine 2. This coreless winding machine has a system of circularly arranged winding rollers 3 for receiving a tape 4 which, under the influence of a reversibly driven bending and driving roller set 5, can be rolled up within the winding space enclosed by the winding rollers 3 and also moved out of the winding machine again, as in DE-PS 11 58 024 described for a hot plate rolling mill. Coreless unwinding is an option if a rolled strip is still too thick to be wound up in a reel on a winding mandrel.

An weiteren Walzgerüsten umfaßt das dargestellte Walzwerk eine Fertigstaffel mit zwei Quarto-Walzgerüsten 6, 7. Gegenüber der allen Walzgerüsten gemeinsamen Walzlinie 8 ist die kernlose Aufwickelmaschine 2 nach unten versetzt angeordnet, und zwar aus folgenden Gründen: der kernlosen Aufwickelmaschine 2 ist eine trichterartige Führung 9 vorgeordnet, die um eine dem Biege- und Treibrollensatz 5 vorgeordnete waagerechte Achse 10 schwenkbar angeordnet ist. In der voll ausgezogen dargestellten hochgesteuerten Schwenklage leitet die Führung 9 das in dem DUO-Walzgerüst 1 reduzierte Metallband 4 aus der Walzlinie 8 in die kernlose Aufwickelmaschine 2 ab. Die schwenkbare Führung 9 ist in der strichpunktiert angedeuteten unteren Schwenklage 9′ auf eine dem DUO-Walzgerüst 1 zugeordnete Umführung 11 gerichtet, die sich bis vor den Walzspalt des Duo-Walzgerüstes 1 erstreckt. Das mit Hilfe des reversierbaren Biege- und Treibrollensatzes 5 aus der Aufwickelmaschine 2 wieder herausbewegte Metallband 4 ist über die nach unten abgeschwenkte trichterartige Führung 9′ und die weitere Umführung 11 dem Walzspalt des Duo-Walzgerüstes 1 erneut zuzuführen, so daß dieses Walzgerüst zweimal durchlaufen wird, ohne daß es reversierbar angetrieben werden müßte.On further rolling stands, the rolling mill shown comprises a finishing line with two four-high rolling stands 6, 7. The coreless rewinder 2 is offset from the common to all the rolling stands 8, for the following reasons: the coreless rewinder 2 is a funnel-like guide 9 upstream, which is arranged pivotably about a horizontal axis 10 upstream of the bending and driving roller set 5. In the fully controlled swiveled position shown in full line, the guide 9 leads the metal strip 4, which is reduced in the DUO roll stand 1, from the rolling line 8 into the coreless winding machine 2. The pivotable guide 9 is in the dash-dotted lower pivot position 9 'directed to a DUO roll stand 1 assigned bypass 11, which extends up to the roll gap of the duo roll stand 1. The metal strip 4, which is moved out of the rewinder 2 with the aid of the reversible bending and driving roller set 5, is via bottom pivoted funnel-like guide 9 'and the further bypass 11 to feed the roll gap of the duo mill stand 1 again, so that this mill stand is run through twice without it having to be driven reversibly.

Die Gesamtanlage nach Fig. 1 zeigt eine Kreisbogen-Stranggießanlage 13 mit einem Auslaufrollgang 14, der bis zu dem ersten DUO-Walzgerüst 1 reicht. Dem Auslaufrollgang 14 ist eine Brennschneidemaschine 15 zugeordnet, die über eine Fahrtstrecke F verfahrbar ist, um kontinuierlich gegossenes Metallband während des Vorschubes des Gießstranges zu unterteilen. In Fig. 1 steht die Brennschneidemaschine 15 am Ende des zum Trennschnitt benötigten Fahrweges F.The entire system according to FIG. 1 shows a continuous arc casting system 13 with an outfeed roller table 14 which extends to the first DUO mill stand 1. The run-out roller table 14 is assigned a flame cutting machine 15, which can be moved over a travel distance F in order to subdivide continuously cast metal strip while the casting strand is being advanced. 1, the flame cutting machine 15 is at the end of the travel path F required for the separating cut.

Die Länge LR des dem ersten Walzgerüst 1 vorgeordneten Auflaufrollgangs-Abschnittes 14a vom Ende des zum Trennschnitt benötigten Fahrweges F der Brennschneidemaschine 15 bis zum ersten Walzgerüst 1 ist etwas größer als die von der Aufnahmefähigkeit der Aufrollmaschine 2 unter Berücksichtigung der Abnahme in dem ersten Walzgerüst 1 bestimmte Teillänge L des einlaufseitigen Vorbandes 12. Damit ist diese Teillänge vor dem Anstich in dem Walzgerüst 1 frei ausgelaufen, so daß die Anstichgeschwindigkeit für dieses erste Walzgerüst höher sein kann als die Gießgeschwindigkeit der Stranggießanlage 13.The length L R of the roller table section 14a upstream of the first roll stand 1 from the end of the travel path F of the flame cutting machine 15 required for the separating cut to the first roll stand 1 is somewhat greater than that of the capacity of the take-up machine 2, taking into account the decrease in the first roll stand 1 certain part length L of the upstream side strip 12. This part length has run out freely before tapping in the roll stand 1, so that the tapping speed for this first roll stand can be higher than the casting speed of the continuous caster 13.

Um die Wirkungsweise der Anlage gemäß der Erfindung zu beschreiben, wird zunächst auf Fig. 2 zurückgekommen. Das von der Stranggießanlage kommende Vorband 12 läuft in das DUO-Walzgerüst 1 ein und wird dort in einem ersten kräftigen Walzstich zu dem Metallband 4 reduziert, das mittels der hochgeschwenkten trichterartigen Führung 9 nach unten aus der Walzlinie 8 abgelenkt und dem Biege- und Treibrollensatz 5 zugeführt wird. Hier erhält das Metallband 4 eine Krümmung, die das kernlose Aufwickeln des Bandes innerhalb des Systems der Wickelrollen 3 ermöglicht. In der kernlosen Aufwickelmaschine 2 wird das reduzierte und noch relativ dicke Metallband 4 während des ersten Walzstiches warmgehalten. Die kernlose Aufwickelmaschine 2 kann daher auch beheizbar sein.To describe the mode of operation of the system according to the invention, reference is first made to FIG. 2. The preliminary strip 12 coming from the continuous casting plant runs into the DUO roll stand 1 and is reduced there to the metal strip 4 in a first strong rolling pass, which is deflected downward from the rolling line 8 by means of the pivoted funnel-like guide 9 and the bending and driving roller set 5 is fed. Here, the metal strip 4 is given a curvature which enables the strip to be wound without a core within the system of the winding rolls 3. In the coreless Rewinder 2, the reduced and still relatively thick metal strip 4 is kept warm during the first roll pass. The coreless winding machine 2 can therefore also be heated.

Nach Vollendung des ersten Stiches im Duo-Walzgerüst 1 wird das Metallband 4 mittels des Biege- und Treibrollensatzes 5 wieder aus der Aufrollmaschine 2 herausbewegt und wieder geradegebogen, wobei die trichterartige Führung 9 in die mit der Umführung 11 korrespondierende Schwenklage 9′ verschwenkt wurde. Das reduzierte Metallband 4 wird auf diese Weise dem Duo-Walzgerüst 1 erneut zugeführt, um in einem zweiten Stich ohne Reversieren dieses Walzgerüstes weiter reduziert zu werden. Es gehört zur Erfindung, daß bei diesem zweiten Durchlauf die Walzgeschwindigkeit des Walzgerüstes 1 (und dementsprechend auch die Drehzahl der reversierten Biege- und Treibrollen 5) soweit wie möglich erhöht ist, um das Band 4 nach der zweiten Reduktion im DUO-Walzgerüst 1 in den Fertig-Walzgerüsten 6 und 7 fertigzuwalzen. Im Bereich zwischen dem ersten Walzgerüst 1 und den Fertiggerüsten 6, 7 kann eine Dickenmessung und Entzunderung des Walzgutes erfolgen.After completion of the first stitch in the duo mill stand 1, the metal strip 4 is moved out of the reeling machine 2 by means of the bending and driving roller set 5 and straightened again, the funnel-like guide 9 having been pivoted into the pivot position 9 corresponding to the bypass 11 '. In this way, the reduced metal strip 4 is fed again to the duo roll stand 1 in order to be further reduced in a second pass without reversing this roll stand. It is part of the invention that in this second pass the rolling speed of the roll stand 1 (and accordingly the speed of the reversed bending and driving rollers 5) is increased as much as possible to the band 4 after the second reduction in the DUO roll stand 1 in the Finished mill stands 6 and 7 ready to be rolled. A thickness measurement and descaling of the rolling stock can take place in the area between the first rolling stand 1 and the finishing stands 6, 7.

In der Annahme, daß die Stranggießanlage 13 mit einer Gießgeschwindigkeit von 6 m/min bzw. 0,1 m/s arbeitet, ist eine Anstichgeschwindigkeit von 0,5 m/s für das erste Walzgerüst 1 ausreichend, um eine geschnittene Teillänge des Vorbandes 12 unter Inanspruchnahme der Aufrollmaschine 2 zweimal durch das Walzgerüst durchlaufen zu lassen, bevor der mit Gießgeschwindigkeit kontinuierlich vorgeschobene Gießstrang das Walzgerüst 1 erreicht. Wenn die Rollgangsrollen dieses Auflaufrollgangs-Abschnittes 14a in ihrer Drehzahl auf die niedrige Gießgeschwindigkeit eingestellt sind, würde das abgetrennte Vorband 12 nach dem Anstich im Walzgerüst 1 mit einer Anstichgeschwindigkeit des fünf- oder mehrfachen Betrages auf den Rollgangsrollen schleifen. Um dies zu verhindern, können die Rollgangsrollen mit einem die niedrige Drehzahl entsprechend der Gießgeschwindigkeit überholenden Freilauf versehen werden. Eine andere Möglichkeit eines schlupflosen Transportes des einlaufenden Gießstranges bzw. der ablaufenden Teillängen kann dadurch erreicht werden, daß die Drehzahl der Rollgangsrollen des Auflaufrollgangs-Abschnittes 14a in Ableitung von Signalen, die die Vollendung eines Trennschnittes durch die Brennschneidemaschine 15 anzeigen, von der der Gießgeschwindigkeit der Stranggießanlage 13 entsprechende Drehzahl auf die der Anstichgeschwindigkeit des ersten Walzgerüstes 1 entsprechende höhere Drehzahl umsteuerbar ist, wobei - da nach jedem Trennstich der Gießstrang mit Gießgeschwindigkeit auf den Auslaufrollgangs-Abschnitt 14a aufläuft - die Rollgangsrollen dieses Abschnittes Einzelantrieb erhalten, und die Antriebe nach der Umsteuerung auf die höhere Anstichgeschwindigkeit mit der ersten Rollgangsrolle beginnend additiy auf die der Gießgeschwindigkeit entsprechende niedrige Drehzahl rückgesteuert werden. Auf diese Weise erhalten alle Rollgangsrollen stets diejenige Drehzahl, die der Vorschubgeschwindigkeit des gerade aufliegenden Materials entspricht.Assuming that the continuous caster 13 operates at a casting speed of 6 m / min or 0.1 m / s, a piercing speed of 0.5 m / s is sufficient for the first roll stand 1 to cut a cut partial length of the preliminary strip 12 using the reeling machine 2 twice through the roll stand before the casting strand continuously advanced at the casting speed reaches the roll stand 1. If the roller table rollers of this roller table section 14a are set in their rotational speed to the low casting speed, the severed pre-strip 12 would, after tapping in the roll stand 1, have a tapping speed of five or more times grind the roller table rollers. To prevent this, the roller table rollers can be provided with a freewheel that overtakes the low speed in accordance with the casting speed. Another possibility of a slip-free transport of the incoming casting strand or the running partial lengths can be achieved in that the speed of the roller table rollers of the roller table section 14a is derived from signals that indicate the completion of a separating cut by the flame cutting machine 15 from the casting speed of the Continuous caster 13 corresponding speed to the higher speed corresponding to the tapping speed of the first roll stand 1 can be reversed, whereby - since after each separating stitch the casting strand runs onto the outlet roller table section 14a at the casting speed - the roller table rollers of this section receive individual drives and the drives after the reversal the higher tapping speed starting with the first roller table roll is controlled back to the low speed corresponding to the casting speed. In this way, all roller table rollers always have the speed that corresponds to the feed speed of the material currently resting on them.

Claims (6)

1. Plant for the rolling of continuously cast metal strip from the casting heat with continuous casting plant arranged directly in front of the roll mechanism, characterised thereby that a coreless reeling machine (2) consisting of a reversible bending and driving roll set (5) and a system of circularly arranged winding rolls (3) is arranged after the or the first roll stand (1), that arranged in front of the coreless reeling machine is a funnel-like guide (9) which is pivotable about a horizontal axis (10), receives the metal strip (4) reduced in the or the first roll pass and which is transferrable from a pivot position in which the reduced metal strip is introduced into the coiling machine into a pivot position in which the guide (9′) is aligned with a return guide (11), which is associated with the first roll stand (1) and which extends up to in front of the roll gap of the first roll stand, and that the or the first roll stand is switchable, for the pasage once again of the metal strip (4) led out of the reeling machine, to a roll speed increased relative to the first pass.
2. Plant according to claim 1, characterised thereby, that the or the first roll stand consists of a two-high roll stand (1).
3. Plant according to claim 1 with fully continuously working continuous casting plant in the outlet roll bed of which is arranged a transportable flame cutting machine for the execution of separating cuts during the advance of the cast strand, characterised thereby that the length (LR) of the outlet roll bed portion (14a), which is arranged in front of the first roll stand (1), from the end of the travel path (F), needed for the separating cut, of the flame cutting machine up to the first roll stand is greater than that partial length (L) of the entering lead strip (12) which is determined by the capacity of the coiling machine (2) with consideration of the reduction in the or the first roll stand, and that the pass speed of the first roll stand (1) is greater than the casting speed of the continuous casting plant (13) in the manner that the first roll stand is free after second passage of a partial length (L) before a just cut partial length reaches the roll stand.
4. Plant according to claim 3, characterised thereby that the roll bed rolls of the outlet roll bed portion (14a) are provided with a free running which overrides the set rotational speed.
5. Plant according to claim 3, characterised thereby that the rotational speed of the roll bed rolls of the outlet roll bed portion (14a) is changeable over, derived from signals which indicate the conclusion of a separating cut, from the rotational speed corresponding to the casting speed of the continuous casting plant (13) to the higher rotational speed corresponding to the pass speed of the first roll stand (1), and that the roll bed rolls have individual drive and after the changing over to the higher speed their drives are changeable back, beginning additively with the first roll bed roll, to the lower rotational speed corresponding to the casting speed.
6. Plant according to claim 5, characterised thereby that the additive changing back of the rotational speed of the roll bed rolls of the outlet roll bed portion (14a) is derived from the decline of the power absorption of the roll bed motors.
EP19890100928 1988-02-10 1989-01-20 Installation for rolling strip immediately behind the continuous casting installation Expired - Lifetime EP0327855B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100928T ATE75168T1 (en) 1988-02-10 1989-01-20 METAL STRIP ROLLING PLANT IMMEDIATELY BEHIND THE CONTINUOUS CASTING PLANT.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3804005 1988-02-10
DE3804005 1988-02-10
DE3812102 1988-04-10
DE3812102A DE3812102A1 (en) 1988-02-10 1988-04-12 Plant for rolling continuously cast metal strip from the casting heat with a continuous casting installation arranged immediately ahead of the rolling mill

Publications (3)

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EP0327855A2 EP0327855A2 (en) 1989-08-16
EP0327855A3 EP0327855A3 (en) 1990-07-04
EP0327855B1 true EP0327855B1 (en) 1992-04-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0446602A (en) * 1990-06-11 1992-02-17 Ishikawajima Harima Heavy Ind Co Ltd Hot rough rolling equipment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373375A (en) * 1971-11-15 1974-11-13 Canada Steel Co Method for rolling hot metal workpieces
JPS58100903A (en) * 1981-12-09 1983-06-15 Kawasaki Steel Corp Train disposed with special continuous casting machine and hot rolling mill
JPS59209405A (en) * 1983-05-12 1984-11-28 Kawasaki Steel Corp Continuous hot rolling line
US4630352A (en) * 1984-09-04 1986-12-23 Tippins Machinery Company, Inc. Continuous rolling method and apparatus
JPH0753284B2 (en) * 1985-12-05 1995-06-07 石川島播磨重工業株式会社 Hot rolling equipment

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EP0327855A2 (en) 1989-08-16
EP0327855A3 (en) 1990-07-04

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