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EP1896200B1 - Process and device for intentionally influencing the geometry of roughed-down strips in a roughing-down stand - Google Patents

Process and device for intentionally influencing the geometry of roughed-down strips in a roughing-down stand Download PDF

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Publication number
EP1896200B1
EP1896200B1 EP06742867A EP06742867A EP1896200B1 EP 1896200 B1 EP1896200 B1 EP 1896200B1 EP 06742867 A EP06742867 A EP 06742867A EP 06742867 A EP06742867 A EP 06742867A EP 1896200 B1 EP1896200 B1 EP 1896200B1
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EP
European Patent Office
Prior art keywords
rolling
regulation
force
stand
lateral guides
Prior art date
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EP06742867A
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German (de)
French (fr)
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EP1896200A1 (en
Inventor
Olaf Norman Jepsen
Heinz-Adolf MÜLLER
Joachim Immekus
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SMS Siemag AG
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SMS Siemag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • 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
    • B21B39/14—Guiding, positioning or aligning work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • 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
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass

Definitions

  • the invention relates to a method and an apparatus for hot rolling in a hot strip mill or in Steckel streets, wherein in one or more roughing stands slabs are rolled out into pre-bands.
  • the resulting pre-bands should be straight, d. H. they should have little sag and they should not have a thickness wedge over the bandwidth.
  • the roughing scaffolding not only has the task of preserving the pre-strip geometry, but also of improving it in a targeted manner, since the slabs entering the scaffolding can already be wedge-shaped or sawed. A change in the Vorbandgeometrie is possible, especially in the first stitches, since the slab thickness in relation to the width is still relatively large and thus a material cross flow in the nip is possible.
  • a device for controlling the position of the tape run, in particular during finish rolling is known in which arranged next to the rolled strip guide rails bending bars with guide rollers which are pressed laterally against the rolled strip.
  • the position control of these roles is superimposed by a pressure control, which causes a shift in the guide rails or guide rollers in the opening direction when occurring compression forces exceeding a predetermined setpoint.
  • the object is procedurally achieved with the characterizing features of claim 1, characterized in that for the targeted influencing the Vorbandgeometrie at least one roughing stand by appropriate regulations a dynamic employment in the roughing stand with fast and powerful side guides before and behind the roughing stand are linked together so that in one or more stitches targeted, reversing or in continuous operation, a säblige or wedged slab is transformed into a straight and wedge-free Vorband.
  • Advantageous embodiments are specified in the subclaims.
  • the inventive influence on the Vorbandgeometrie is carried out with the help of employment in the horizontal frame and the two adjustable side guides in front of and behind the framework.
  • the employment in the horizontal framework ensures a constant strip thickness over the bandwidth (no thickness wedge).
  • the appointment is with the pivot to control RAC (R oll A lignment C ontrol), which was not used for roughing stands previously regulated so that the nip remain parallel even if emanating from the band interference.
  • Disturbances are mainly an incoming thickness wedge over the bandwidth, temperature differences across the bandwidth, off-center position of the strip in the nip and uneven tension distribution across the bandwidth on the inlet side and the outlet side.
  • the principle of the swivel control is that the differential rolling force is measured and a swivel value is calculated by the swivel control. This is then used in each case in half as additional setpoint for the separate position controls the drive and operating side of the scaffold. For the employment of the contact forces by the hydraulic cylinder is then moved accordingly. In principle, the swivel control compensates for the skeletal strain, which arises due to the differential forces.
  • the task of the side guides is to prevent curving or twisting of the band (saber formation).
  • the side guides on each side are kept parallel and at the same distance from the center of the frame.
  • the synchronization of the opposite rulers of a side guide is realized mechanically and the employment carried out with electric or hydraulic drive.
  • hydraulically driven lateral guides are best suited, since hydraulic drives are very dynamic and, in addition to regulating the position, also allow force control in order to keep the belt straight.
  • the position control keeps the side guides at a distance that is slightly greater than the bandwidth and, for example, at the inlet side, the bandwidth is plus 10 mm and at the outlet side the bandwidth is plus 40 mm.
  • Position monitoring increases the force setpoint if the side guides want to escape.
  • FIG. 1 is the part of the inventive combination of regulations shown, which relates to the roll adjustment for the horizontal rollers of the roughing stand and that the control scheme of a swivel control RAC.
  • back-up rolls 3 and slab 4 shown Vorgerüst 1 cylinder forces F CAS , F CBS , applied to the drive side AS and on the operating side BS by means arranged on the bearing of the upper support roller 3 cylinder cylinder 15 and the resulting forces during rolling continuously measured at the lower bearing support surface of the support rollers.
  • the differential rolling force .DELTA.F LC is determined from the obtained force measured values F LcAS and F LcBS and fed together with a reference value .DELTA.F REF to the differential rolling force of the swivel control RAC 20 and a reference swivel value .DELTA.S RAC is calculated here.
  • This pivotal value .DELTA.S RAC is then used in half as additional setpoint together with the reference position S REF for the separate position controls 25 of the drive side AS and the operating side BS of the upper support roller 3, the employment then laterally engages the hydraulic cylinders 15.
  • FIG. 2 shows a roughing stand with back-up rolls 3 and work rolls 2 in a plan view.
  • adjusting devices 18 with hydraulic drive.
  • These adjusting devices 18 consist, as in the circuit diagram of Fig. 3 can be seen from a common hydraulic unit 11 (hydraulic pump), piston-cylinder units 12, control valves 13 and various hydraulic lines 10.
  • measuring devices for determining the piston position 14 and for determining the hydraulic pressure 19 are present.
  • the distance of the side guides 8 is widened wedge-shaped at its front end.
  • the two inventively simultaneously performed regulations are shown schematically in their effect.
  • the incoming in the rolling direction 7 in the rolling mill slab 4 (the rolling stand is symbolized only by the work roll 2) contains a designated over the slab width with h 0 wedge thickness profile with the drive side AS towards increasing thickness. Due to the rolling process, the wedge-shaped thickness profile was eliminated and a pre-strip with the thickness profile h 1 was produced.
  • the case applied by the work rolls 2 rolling force F WAS was on the drive side while greater than the rolling force F WBS on the operating side, whereby a material transverse flow in the direction of arrow 6 from the drive side to the operating side.
  • the incoming slab 4 are laterally supported by the side guides 8 and the outgoing pre-strip 5 by the side guides 9.
  • the supporting forces F 1 and F 2 in front of and behind the roll stand generate in response the tension profile ⁇ 0 in the incoming slab 4 and the tension profile ⁇ 1 in the outgoing sliver 5.
  • These tension profiles ⁇ 0 , ⁇ 1 act on the roll gap and allow the material transverse flow 6, which allows the correction of the geometric error of the slab.
  • FIG. 5 are the options described above, the coupling of the employment of the rollers and the side guides according to the invention with the aim to limit the load on the control systems and to distribute the correction of the slab geometry on several stitches, shown schematically.
  • the invention is not limited to the illustrated embodiments, but, for example, according to the type of used Vorbandgerüste or drives used for the side guides variable if the inventive measure of linking a pivoting control RAC of the rollers with the mechanical employment of side guides for the rolling continue underlying.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Details Of Garments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

When rolling hot-rolled strips, different draughts per pass might occur during the rolling operation over the length of the roll gap, due to changes in the hardness of the rolling stock, to the roll gap itself or to the geometry of the incoming rolling stock. These different draughts per pass lead to lateral deviations and shifts of the rolling stock in the roll stand and to a lateral bending of the outgoing hot-rolled strip. In order to avoid these defects by intentionally influencing the geometry of the rough-rolled strip, it is proposed to interconnect in at least one roughing-down stand a dynamic positioning in the roughing-down stock (1) with fast and powerful lateral guides (8,9) arranged before and after the roughing-down stand (1), by corresponding regulation operations, in such a way that a grainy or tapering bloom (4) is shaped into a straight and taper-free roughed-down strip (5) in one or more passes, in continuous or reciprocating operation.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Warmwalzen in einer Warmbandstraße oder in Steckelstraßen, wobei in einem oder mehreren Vorgerüsten Brammen zu Vorbändern ausgewalzt werden.The invention relates to a method and an apparatus for hot rolling in a hot strip mill or in Steckel streets, wherein in one or more roughing stands slabs are rolled out into pre-bands.

Die hierbei erzeugten Vorbänder sollten gerade sein, d. h. sie sollten nur eine geringe Säbligkeit aufweisen und sie sollten keinen Dickenkeil über die Bandbreite haben. Die Vorgerüste haben dabei nicht nur die Aufgabe, die Vorbandgeometrie zu erhalten, sondern sie gezielt zu verbessern, da die in die Gerüste einlaufenden Brammen bereits keilig oder säblig sein können. Eine Veränderung der Vorbandgeometrie ist dabei vor allem in den ersten Stichen möglich, da die Brammendicke im Verhältnis zur Breite noch relativ groß ist und somit ein Materialquerfluss im Walzspalt möglich ist.The resulting pre-bands should be straight, d. H. they should have little sag and they should not have a thickness wedge over the bandwidth. The roughing scaffolding not only has the task of preserving the pre-strip geometry, but also of improving it in a targeted manner, since the slabs entering the scaffolding can already be wedge-shaped or sawed. A change in the Vorbandgeometrie is possible, especially in the first stitches, since the slab thickness in relation to the width is still relatively large and thus a material cross flow in the nip is possible.

Beim Walzen von Warmband ergeben sich im Walzbetrieb gelegentlich unterschiedlich große Stichabnahmen über die Länge des Walzspalts (über die Bandbreite), die auf Änderungen der Walzguthärte, des Walzspalts selbst oder auf die Geometrie des einlaufenden Walzgutes zurückzuführen sind. Diese unterschiedlich großen Stichabnahmen führen dann zu seitlichen Auslenkungen und Versetzbewegungen des Walzgutes im Gerüst und zu einer seitlichen Krümmung des auslaufenden Warmbandes.When rolling hot strip resulting in rolling operation occasionally different size Stichabnahmen over the length of the roll gap (on the bandwidth), which are due to changes in Walzguthärte, the roll gap itself or on the geometry of the incoming rolling stock. These different sized stitches then lead to lateral deflections and Versetzbewegungen the rolling stock in the framework and a lateral curvature of the expiring hot strip.

Zur Verlaufsregelung bzw. zur Krümmungskorrektur des auslaufenden Warmbandes sind verschiedene Verfahren und Vorrichtungen bekannt.For process control or for the curvature correction of the expiring hot strip various methods and devices are known.

So wird in der DE 197 04 337 A1 zur Verlaufsregelung eines Walzbandes beim Durchlauf durch eine Walzstraße vorgeschlagen, zumindest bei einem Walzgerüst die Position des Walzbandes bezüglich der Mittellinie der Walzstraße zu messen und unter Verwendung der Messwerte die Walzkraftverteilung in Längsrichtung der Walzen dieses Walzgerüst auf eine gewünschte Sollposition zu regeln. Durch diese Maßnahme wird in guter Näherung ein symmetrischer Verlauf des Walzbandes zur Mittellinie der Walzstraße erreicht, allerdings eventuell unter Erzeugung eines keiligen Walzbandes.So will in the DE 197 04 337 A1 for the course control of a rolled strip when passing through a rolling train, it is proposed to measure the position of the rolled strip relative to the center line of the rolling line, at least for a roll stand, and to control the rolling force distribution in the longitudinal direction of the rolls of this rolling stand to a desired desired position using the measured values. By this measure, a symmetrical course of the rolled strip is achieved to the center line of the rolling train to a good approximation, but possibly to produce a keiligen rolled strip.

Eine andere Möglichkeit der Verhinderung des seitlichen Verbiegens des Walzbandes, das kontinuierlich durch eine Vorwalzstraße mit einer Kantenwalzvorrichtung zur breitenmäßigen Beeinflussung und einer horizontalen Walzvorrichtung zur Beeinflussung der Dicke bewegt wird, besteht nach der DE 43 10 547 C2 darin, seitlich neben dem Walzband hydraulisch verstellbare Seitenführungen anzuordnen, die vor und hinter der Kantenwalzvorrichtung angeordnet sind und die seitliche Verschiebung der gewalzten Bramme steuern und die den behinderungsfreien Einlauf und Auslauf des Walzbandes durch wechselweises Verengen des Seitenführungsabstandes ermöglichen.Another possibility of preventing the lateral bending of the rolled strip, which is continuously moved by a rough rolling mill with an edge-rolling device for width-influencing and a horizontal rolling device for influencing the thickness, according to the DE 43 10 547 C2 in that laterally next to the rolled strip to arrange hydraulically adjustable side guides, which are arranged in front of and behind the edge rolling and control the lateral displacement of the rolled slab and allow the disability-free inlet and outlet of the rolled strip by alternately narrowing the lateral guidance distance.

Aus der DE 31 16 278 C2 ist eine Vorrichtung zum Steuern der Lage des Bandlaufs insbesondere beim Fertigwalzen bekannt, bei der neben dem Walzband angeordnete Führungsleisten Biegebalken mit Führungsrollen aufweisen, die seitlich gegen das Walzband gedrückt werden. Die Positionsregelung dieser Rollen ist durch eine Druckregelung überlagert, die bei auftretenden Stauchkräften, die einen vorgegebenen Sollwert übersteigen, eine Verschiebung der Führungsleisten bzw. Führungsrollen im Öffnungssinne bewirkt.From the DE 31 16 278 C2 a device for controlling the position of the tape run, in particular during finish rolling is known in which arranged next to the rolled strip guide rails bending bars with guide rollers which are pressed laterally against the rolled strip. The position control of these roles is superimposed by a pressure control, which causes a shift in the guide rails or guide rollers in the opening direction when occurring compression forces exceeding a predetermined setpoint.

Ausgehend von diesem bekannten Stand der Technik ist es Aufgabe der Erfindung, eine gezielte Beeinflussung der Vorbandgeometrie beim Warmwalzen in konventionellen Warmbandstraßen oder in Steckelstraßen durchzuführen mit dem Ziel, gerade Vorbänder ohne Dickenkeil und ohne seitliche Krümmung zu erzeugen.Based on this known prior art, it is an object of the invention to perform a targeted influencing the Vorbandgeometrie when hot rolling in conventional hot strip mills or Steckel streets with the aim to produce just Vorbänder without thickness wedge and without lateral curvature.

Die gestellte Aufgabe wird verfahrensmäßig mit den kennzeichnenden Merkmalen des Anspruchs 1 dadurch gelöst, dass zur gezielten Beeinflussung der Vorbandgeometrie an mindestens einem Vorgerüst durch entsprechende Regelungen eine dynamische Anstellung im Vorgerüst mit schnellen und kräftigen Seitenführungen vor und hinter dem Vorgerüst so miteinander verknüpft sind, dass in einem oder mehreren Stichen gezielt, reversierend oder im Durchlaufbetrieb, eine säblige oder keilige Bramme in ein gerades und keilfreies Vorband umgeformt wird. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.The object is procedurally achieved with the characterizing features of claim 1, characterized in that for the targeted influencing the Vorbandgeometrie at least one roughing stand by appropriate regulations a dynamic employment in the roughing stand with fast and powerful side guides before and behind the roughing stand are linked together so that in one or more stitches targeted, reversing or in continuous operation, a säblige or wedged slab is transformed into a straight and wedge-free Vorband. Advantageous embodiments are specified in the subclaims.

Die erfindungsgemäße Beeinflussung der Vorbandgeometrie wird mit Hilfe der Anstellung im Horizontalgerüst und den beiden anstellbaren Seitenführungen vor und hinter dem Gerüst durchgeführt. Die Anstellung im Horizontalgerüst sorgt dabei für eine konstante Banddicke über die Bandbreite (kein Dickenkeil). Die Anstellung wird dazu mit der Schwenkregelung RAC (Roll Alignment Control), die für Vorgerüste bisher nicht eingesetzt wurde, so geregelt, dass der Walzspalt auch bei vom Band ausgehenden Störungen parallel bleibt. Störgrößen sind dabei vor allem ein einlaufender Dickenkeil über die Bandbreite, Temperaturunterschiede über die Bandbreite, außermittige Lage des Bandes im Walzspalt und ungleichmäßige Zugverteilung über die Bandbreite auf der Einlaufseite sowie der Auslaufseite.The inventive influence on the Vorbandgeometrie is carried out with the help of employment in the horizontal frame and the two adjustable side guides in front of and behind the framework. The employment in the horizontal framework ensures a constant strip thickness over the bandwidth (no thickness wedge). The appointment is with the pivot to control RAC (R oll A lignment C ontrol), which was not used for roughing stands previously regulated so that the nip remain parallel even if emanating from the band interference. Disturbances are mainly an incoming thickness wedge over the bandwidth, temperature differences across the bandwidth, off-center position of the strip in the nip and uneven tension distribution across the bandwidth on the inlet side and the outlet side.

Das Prinzip der Schwenkregelung besteht darin, dass die Differenzwalzkraft gemessen und durch die Schwenkregelung ein Schwenkwert berechnet wird. Dieser wird dann jeweils zur Hälfte als Zusatzsollwert für die getrennten Positionsregelungen der Antriebs- und Bedienseite des Gerüstes verwendet. Für die Anstellungen der Anpresskräfte durch die Hydraulikzylinder wird dann entsprechend verfahren. Im Prinzip kompensiert die Schwenkregelung die Gerüstquerdehnung, die auf Grund der Differenzkräfte entstehen.The principle of the swivel control is that the differential rolling force is measured and a swivel value is calculated by the swivel control. This is then used in each case in half as additional setpoint for the separate position controls the drive and operating side of the scaffold. For the employment of the contact forces by the hydraulic cylinder is then moved accordingly. In principle, the swivel control compensates for the skeletal strain, which arises due to the differential forces.

Die Aufgabe der Seitenführungen ist es, eine Krümmung oder ein Verdrehen des Bandes zu verhindern (Säbelbildung). Dazu werden die Seitenführungen auf jeder Seite parallel und im gleichen Abstand zur Gerüstmitte, gehalten. Der Gleichlauf der gegenüberliegenden Lineale einer Seitenführung wird mechanisch realisiert und die Anstellung mit elektrischem oder hydraulischem Antrieb durchgeführt. Für das hier beschriebene erfindungsgemäße Verfahren sind hydraulisch angetriebene Seitenführungen am besten geeignet, da hydraulische Antriebe sehr dynamisch sind und ohne großen Aufwand neben der Positions-regelung auch eine Kraftregelung ermöglichen, um das Band gerade zu halten. Die Positionsregelung hält die Seitenführungen in einem Abstand, der etwas größer ist als die Bandbreite und beispielsweise an der Einlaufseite Bandbreite plus 10 mm und an der Auslaufseite Bandbreite plus 40 mm beträgt.The task of the side guides is to prevent curving or twisting of the band (saber formation). For this purpose, the side guides on each side are kept parallel and at the same distance from the center of the frame. The synchronization of the opposite rulers of a side guide is realized mechanically and the employment carried out with electric or hydraulic drive. For the method according to the invention described here, hydraulically driven lateral guides are best suited, since hydraulic drives are very dynamic and, in addition to regulating the position, also allow force control in order to keep the belt straight. The position control keeps the side guides at a distance that is slightly greater than the bandwidth and, for example, at the inlet side, the bandwidth is plus 10 mm and at the outlet side the bandwidth is plus 40 mm.

Überlagert ist dieser Positionsregelung eine Kraftregelung, die die Seitenführung gegen eine Überlastung schützt und die Seitenführung mit einer definierten Kraft gegen das Band drückt. Eine Positionsüberwachung erhöht dabei den Kraftsollwert, wenn die Seitenführungen ausweichen wollen.Superimposed on this position control is a force control that protects the side guide against overloading and presses the side guide with a defined force against the belt. Position monitoring increases the force setpoint if the side guides want to escape.

Durch das erfindungsgemäße Zusammenspiel dieser Stellsysteme und Regelungen ist es möglich, eine säblige oder keilige Bramme in ein gerades und keilfreies Vorband umzuformen. Wenn beispielsweise eine gerade Bramme mit einem Dickenkeil in das Vorgerüst einläuft, wird durch den zwingend parallel gehaltenen Walzspalt ein keilfrei auslaufendes Vorband erzeugt. Die dabei erzwungene Profiländerung führt dazu, dass das Band in einer Richtung säbelförmig ausläuft und sich das Band auf der Einlaufseite in diese Richtung drehen möchte. Die Seitenführungen verhindern diese Bewegungen, wobei Reaktionskräfte entstehen, die gegen die Seitenführungen wirksam werden. Gleichzeitig entstehen im Band Zugkräfte über die Bandbreite, die auf den Walzspalt wirken und einen Materialfluss quer zur Walzrichtung im Walzspalt erzeugen. Dieser Materialquerfluss, der nur bei einem entsprechend dicken Walzgut stattfinden kann, ermöglicht somit im Grunde erst die erfindungsgemäße Beeinflussung der Vorbandgeometrie.Due to the inventive interaction of these control systems and regulations, it is possible to reshape a sawy or wedged slab into a straight and wedge-free sub-band. If, for example, a straight slab enters the roughing stand with a thickness wedge, a sliver-free leading sliver is produced by the compulsory parallel held roll gap. The forced change of profile causes the band to run off in a saber-shaped direction and the band on the inlet side wants to turn in that direction. The side guides prevent these movements, creating reaction forces that act against the side guides. At the same time, tensile forces occur across the strip in the strip, which act on the nip and produce a flow of material transverse to the rolling direction in the nip. This material crossflow, which can take place only with a correspondingly thick rolling stock, thus basically only makes it possible to influence the pre-strip geometry according to the invention.

Um eine Überlastung der Stellsysteme bei extremen Geometriefehlern zu verhindern und eine Verteilung der Geometrieänderung über mehrere Stiche zu ermöglichen, kann erfindungsgemäß die Regelung der Anstellung der Walzen und der Seitenführungen noch miteinander gekoppelt werden. Zur Kopplung wird dabei wie folgt vorgegangen:

  • ● Vorgabe eines Referenzwertes der Differenzwalzkraft oder eines maximalen Schwenkwertes in Abhängigkeit von den aktuellen Druckkräften oder den aktuellen Positionen der Seitenführungen oder
  • ● Vorgabe der Positionssollwerte oder der Kraftsollwerte der Seitenführungen in Abhängigkeit von der aktuellen Differenzwalzkraft oder der Differenzposition der Schwenkung.
In order to prevent overloading of the positioning systems in the case of extreme geometrical errors and to enable a distribution of the geometry change over a plurality of stitches, according to the invention the regulation of the adjustment of the rollers and the side guides can still be coupled with each other. For coupling, the procedure is as follows:
  • ● Specification of a reference value of the differential rolling force or a maximum swivel value depending on the actual pressure forces or the current positions of the side guides or
  • ● Specification of the position setpoints or the force setpoints of the side guides as a function of the current differential rolling force or the difference position of the swivel.

Weitere Einzelheiten und Vorteile der Erfindung werden nachfolgend an in schematischen Zeichnungsfiguren dargestellten Ausführungsbeispielen näher erläutert.Further details and advantages of the invention are explained in more detail below by way of exemplary embodiments illustrated in schematic drawing figures.

Es zeigen:

Fig. 1
ein Regelschema der Walzenanstellung (Schwenkregelung RAC),
Fig. 2
ein Vorgerüst in einer Draufsicht,
Fig. 3
ein Regelschema der Seitenführungen,
Fig. 4
Verknüpfung der Regetschemata der Fig. 1 und 3,
Fig. 5
Kopplung von Walzenanstellung und Seitenführungen.
Show it:
Fig. 1
a control scheme of roller adjustment (swivel control RAC),
Fig. 2
a roughing stand in a top view,
Fig. 3
a control scheme of the side guides,
Fig. 4
Linking the Regetschemata of Fig. 1 and 3 .
Fig. 5
Coupling of roller adjustment and side guides.

In der Figur 1 ist der Teil der erfindungsgemäßen Verknüpfung der Regelungen dargestellt, der die Walzenanstellung für die Horizontalwalzen des Vorgerüstes betrifft und zwar das Regelschema einer Schwenkregelung RAC. Bei dem in einer Vorderansicht mit Arbeitswalzen 2, Stützwalzen 3 und Bramme 4 dargestellten Vorgerüst 1 werden an der Antriebsseite AS und an der Bedienseite BS mittels am Lager der oberen Stützwalze 3 angeordneter Hydraulikzylinder 15 Zylinderkräfte FCAS ,FCBS, aufgebracht und die beim Walzvorgang resultierenden Kräfte an der unteren Lagerauflagefläche der Stützwalzen kontinuierlich gemessen. Aus den erhaltenen Kraftmesswerten FLcAS und FLcBS wird die Differenzwalzkraft ΔFLC ermittelt und gemeinsam mit einem Referenzwert ΔFREF der Differenzwalzkraft der Schwenk-Regelung RAC 20 zugeführt und hier ein Referenz Schwenkwert ΔSRAC berechnet. Dieser Schwenkwert ΔSRAC wird dann halbiert als Zusatzsollwert gemeinsam mit der Referenz Position SREF für die getrennten Positionsregelungen 25 der Antriebsseite AS und die Bedienseite BS der oberen Stützwalze 3 verwendet, wobei die Anstellung dann seitlich an den Hydraulikzylindern 15 angreift.In the FIG. 1 is the part of the inventive combination of regulations shown, which relates to the roll adjustment for the horizontal rollers of the roughing stand and that the control scheme of a swivel control RAC. When in a front view with work rolls 2, back-up rolls 3 and slab 4 shown Vorgerüst 1 cylinder forces F CAS , F CBS , applied to the drive side AS and on the operating side BS by means arranged on the bearing of the upper support roller 3 cylinder cylinder 15 and the resulting forces during rolling continuously measured at the lower bearing support surface of the support rollers. The differential rolling force .DELTA.F LC is determined from the obtained force measured values F LcAS and F LcBS and fed together with a reference value .DELTA.F REF to the differential rolling force of the swivel control RAC 20 and a reference swivel value .DELTA.S RAC is calculated here. This pivotal value .DELTA.S RAC is then used in half as additional setpoint together with the reference position S REF for the separate position controls 25 of the drive side AS and the operating side BS of the upper support roller 3, the employment then laterally engages the hydraulic cylinders 15.

In den Figuren 2 und 3 ist der andere Teil der erfindungsgemäßen Verknüpfung der Regelungen dargestellt, und zwar die Regelung der Seitenführungen 8, 9, die seitlich neben dem Walzband als Teil des Vorgerüstes 1 angeordnet sind. Fig. 2 zeigt dabei ein Vorgerüst mit Stützwalzen 3 und Arbeitswalzen 2 in einer Draufsicht. Von der Walzrichtung 7 ausgehend sind vor den Walzen 2, 3 auf dem Einlauf-Rollgang 16 einander gegenüberliegende Seitenführungen 8 angeordnet mit an der Antriebsseite AS des Vorgerüstes 1 angeordneten Anstellungsvorrichtungen 18 mit hydraulischem Antrieb. Diese Anstellungsvorrichtungen 18 bestehen, wie im Schaltschema der Fig. 3 ersichtlich, aus einem gemeinsamen Hydraulikaggregat 11 (Hydraulikpumpe), Kolbenzylindereinheiten 12, Steuerventilen 13 sowie diversen Hydraulikleitungen 10. Weiterhin sind Messgeräte zur Bestimmung der Kolbenposition 14 und zur Bestimmung des Hydraulikdrucks 19 vorhanden. Um den Einlauf und die Zentrierung der Bramme auf die Gerüstmitte zu erleichtern, ist der Abstand der Seitenführungen 8 an ihrem vorderen Ende keilförmig erweitert.In the Figures 2 and 3 the other part of the combination of regulations according to the invention is shown, namely the regulation of the side guides 8, 9, which are arranged laterally next to the rolled strip as part of the roughing stand 1. Fig. 2 shows a roughing stand with back-up rolls 3 and work rolls 2 in a plan view. Starting from the rolling direction 7, 16 opposing side guides 8 are arranged in front of the rollers 2, 3 on the inlet roller table with arranged on the drive side AS of the roughing stand 1 adjusting devices 18 with hydraulic drive. These adjusting devices 18 consist, as in the circuit diagram of Fig. 3 can be seen from a common hydraulic unit 11 (hydraulic pump), piston-cylinder units 12, control valves 13 and various hydraulic lines 10. Furthermore, measuring devices for determining the piston position 14 and for determining the hydraulic pressure 19 are present. In order to facilitate the inlet and the centering of the slab on the frame center, the distance of the side guides 8 is widened wedge-shaped at its front end.

In gleicher Weise sind hinter den Walzen 2, 3 auf dem Auslauf-Rollgang 17 (Fig. 2) einander gegenüberliegende Seitenführungen 9 angeordnet, deren Abstand voneinander der nun geänderten Bandbreite entsprechend angepasst ist (diese Veränderung ist in der Zeichnung nicht dargestellt). Das erfindungsgemäß angewandte Regelschema wird anhand von Fig. 3 für die in Fig. 2 dargestellte Seitenführung 9 näher erläutert. Die mit den Messgeräten 14 ermittelten aktuellen Kolbenpositionen werden in einen Positionsrechner 30 sowie die mit den Messgeräten 19 ermittelten aktuellen Druckkräfte in einen Kraftrechner 40 eingespeist. Die dort erhaltenen aktuellen Werte für die Positionen SSACT werden in die Positionsregelung 35 und die aktuellen Werte für die Druckkräfte FSACT in die Kraftregelung 45 eingespeist. Mit den vorgegebenen Referenzwerten für die Positionen SSREF und für die Hydraulikdrucke FSREF werden die zu regelnden Positionen und Kräfte ermittelt und über die Steuerventile 13 auf die Kolbenzylindereinheiten 12 übertragen.In the same way, behind the rollers 2, 3 on the outlet roller table 17 (FIG. Fig. 2 ) arranged opposite side guides 9, whose distance from one another is adapted to the now changed bandwidth (this change is not shown in the drawing). The control scheme used in the invention is based on Fig. 3 for the in Fig. 2 illustrated side guide 9 explained in more detail. The current piston positions determined with the measuring devices 14 are fed into a position calculator 30 and the current pressure forces determined by the measuring devices 19 into a force computer 40. The current values for the positions S SACT obtained there are fed into the position control 35 and the current values for the pressure forces F SACT in the force control 45. With the predetermined reference values for the positions S SREF and for the hydraulic pressures F SREF , the positions and forces to be controlled are determined and transmitted via the control valves 13 to the piston-cylinder units 12.

In der Figur 4 sind die beiden erfindungsgemäß gleichzeitig durchgeführten Regelungen in ihrer Wirkung schematisch dargestellt. Die in Walzrichtung 7 in das Walzgerüst einlaufende Bramme 4 (das Walzgerüst wird lediglich durch die Arbeitswalze 2 symbolisiert) enthält ein über die Brammenbreite mit h0 bezeichnetes keiliges Dickenprofil mit zur Antriebsseite AS hin ansteigender Dicke. Durch den Walzvorgang wurde das keilige Dickenprofil behoben und ein Vorband mit dem Dickenprofil h1 erzeugt. Die hierbei von den Arbeitswalzen 2 aufzubringende Walzkraft FWAS war an der Antriebsseite dabei größer als die Walzkraft FWBS an der Bedienseite, wodurch ein Materialquerfluss in Pfeilrichtung 6 von der Antriebsseite zur Bedienseite erfolgte.In the FIG. 4 the two inventively simultaneously performed regulations are shown schematically in their effect. The incoming in the rolling direction 7 in the rolling mill slab 4 (the rolling stand is symbolized only by the work roll 2) contains a designated over the slab width with h 0 wedge thickness profile with the drive side AS towards increasing thickness. Due to the rolling process, the wedge-shaped thickness profile was eliminated and a pre-strip with the thickness profile h 1 was produced. The case applied by the work rolls 2 rolling force F WAS was on the drive side while greater than the rolling force F WBS on the operating side, whereby a material transverse flow in the direction of arrow 6 from the drive side to the operating side.

Um bei der Beseitigung des keiligen Dickenprofils ein seitliches Verdrehen der einlaufenden Bramme 4 und eine Säbelbildung des Vorbandes 5 zu verhindern, sind die einlaufende Bramme 4 durch die Seitenführungen 8 und das auslaufende Vorband 5 durch die Seitenführungen 9 seitlich abgestützt.In order to prevent a lateral twisting of the incoming slab 4 and a saber formation of the pre-strip 5 in the elimination of the wedge-shaped thickness profile, the incoming slab 4 are laterally supported by the side guides 8 and the outgoing pre-strip 5 by the side guides 9.

Die Abstützkräfte F1 und F2 vor und hinter dem Walzgerüst erzeugen als Reaktion das Zugprofil σ0 in der einlaufenden Bramme 4 und das Zugprofil σ1 im auslaufenden Vorband 5. Diese Zugprofile σ0, σ1 wirken auf den Walzspalt und ermöglichen den Materialquerfluss 6, der die Korrektur des geometrischen Fehlers der Bramme ermöglicht.The supporting forces F 1 and F 2 in front of and behind the roll stand generate in response the tension profile σ 0 in the incoming slab 4 and the tension profile σ 1 in the outgoing sliver 5. These tension profiles σ 0 , σ 1 act on the roll gap and allow the material transverse flow 6, which allows the correction of the geometric error of the slab.

In der Figur 5 sind die vorstehend beschriebenen Möglichkeiten der erfindungsgemäßen Kopplung der Anstellung der Walzen und der Seitenführungen mit dem Ziel, die Belastung der Stellsysteme zu begrenzen und die Korrektur der Brammengeometrie auf mehrere Stiche zu verteilen, schematisch dargestellt.In the FIG. 5 are the options described above, the coupling of the employment of the rollers and the side guides according to the invention with the aim to limit the load on the control systems and to distribute the correction of the slab geometry on several stitches, shown schematically.

Dargestellt ist hier eine Kopplungsregeleinheit 50 in die, gekennzeichnet durch entsprechende Richtungspfeile, die aktuellen Werte eines Walzgerüstes für

  • die Differenzwalzkraft ΔFLC
  • die Differenzposition des Differenzschwenkwertes ΔSRAC
  • die Positionen der Seitenführungen SSACT
  • die Druckkräfte der Seitenführungen FSACT
einfließen und aus der, gleichfalls gekennzeichnet durch entsprechende Richtungspfeile die Vorgabewerte zur Verwendung beim nachfolgenden Walzgerüst entnommen werden:
  • ein Referenzwert der Differenzwalzkraft ΔFREF
  • ein maximaler Schwenkwert ΔSRACMAX
  • die Positionsreferenzwerte der Seitenführungen SSREF
  • die Kraftreferenzwerte der Seitenführungen FSREF.
Shown here is a coupling control unit 50 in which, characterized by corresponding direction arrows, the current values of a rolling stand for
  • the differential rolling force ΔF LC
  • the difference position of the Differenzschwenkwertes ΔS RAC
  • the positions of the side guides S SACT
  • the pressure forces of the lateral guides F SACT
and from which, also indicated by corresponding directional arrows, the default values for use in the following rolling stand are taken:
  • a reference value of the differential rolling force ΔF REF
  • a maximum slew value ΔS RACMAX
  • the position reference values of the side guides S SREF
  • the force reference values of the side guides F SREF .

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt, sondern beispielsweise entsprechend der Bauart der verwendeten Vorbandgerüste oder der verwendeten Antriebe für die Seitenführungen variierbar, wenn die erfindungsgemäße Maßnahme der Verknüpfung einer Schwenk-Regelung RAC der Walzen mit der mechanischen Anstellung von Seitenführungen für das Walzgut weiterhin zu Grunde liegt.The invention is not limited to the illustrated embodiments, but, for example, according to the type of used Vorbandgerüste or drives used for the side guides variable if the inventive measure of linking a pivoting control RAC of the rollers with the mechanical employment of side guides for the rolling continue underlying.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Walzgerüst

AS
Walzen-Antriebsseite
BS
Walzen-Bedienseite
1
Vorgerüst
2
Arbeitswalze
3
Stützwalze
4
Bramme
5
Vorband
7
Walzrichtung
8
Seitenführung Einlaufseite
9
Seitenführung Auslaufseite
10
Hydraulikleitungen
11
Hydraulik-Aggregat
12
Kolben-Zylindereinheit für Seitenführungen
13
Steuerventil
14
Messgerät für Kolbenstellung
15
Hydraulikzylinder für Schwenkregelung
16
Einlauf-Rollgang
17
Auslauf-Rollgang
18
Anstellungsvorrichtung für Seitenführungen
19
Messgerät für Hydraulikdruck
20
Schwenk-Regelung RAC (Roll Alignment Control)
25
Positions-Regelung für Schwenkregelung
30
Positions-Rechner für Seitenführungen
35
Positions-Regelung für Seitenführungen
40
Kraft-Rechner für Seitenführungen
45
Kraft-Regelung für Seitenführungen
50
Kopplungsregeleinheit
rolling mill
AS
Roll drive side
BS
Roller operating side
1
roughing
2
Stripper
3
supporting roll
4
slab
5
opening act
7
rolling direction
8th
Side guide inlet side
9
Side guide outlet side
10
hydraulic lines
11
Hydraulic power unit
12
Piston-cylinder unit for side guides
13
control valve
14
Measuring device for piston position
15
Hydraulic cylinder for swivel control
16
Infeed roller table
17
Outlet roller table
18
Adjustment device for side guides
19
Hydraulic pressure gauge
20
Swivel control RAC ( R oll A alignment C ontrol)
25
Position control for swivel control
30
Position calculator for side guides
35
Position control for side guides
40
Power calculator for side guides
45
Force control for side guides
50
Coupling control unit

Walzbandeigenschaften

6
Querfluss-Richtung
h0
einlaufendes Dickenprofil
h1
auslaufendes Dickenprofil
σ0
einlaufendes Zugprofil
σ1
auslaufendes Zugprofil
Rolled strip properties
6
Cross Flow direction
h 0
incoming thickness profile
h 1
tapered thickness profile
σ 0
incoming tensile profile
σ 1
expiring train profile

Positionen

SREF
Referenz Position
SSREF
Positionsreferenzwerte
SSACT
aktuelle Positionen der Seitenführungen
ΔSRAC
Referenz Schwenkwert
ΔSRACMAX
maximaler Schwenkwert
positions
S REF
Reference position
S SREF
Position reference values
S SACT
current positions of the side guides
ΔS RAC
Reference swivel value
ΔS RACMAX
maximum swivel value

Kräfte

FLcAS
gemessene Kraft, Antriebsseite
FLcBS
gemessene Kraft, Bedienseite
FCAS
Zylinderkraft, Antriebsseite
FCBS
Zylinderkraft, Bedienseite
ΔFLC
Differenzwalzkraft
ΔFREF
Referenzwert der Differenzwalzkraft
FSREF
Kraftreferenzwerte der Seitenführungen
FSACT
aktuelle Druckkräfte der Seitenführungen
FWAS
Walzkräfte je Antriebsseite
FWBS
Walzkräfte je Bedienseite
F1, F2
Kräfte auf die Seitenführungen
personnel
F LcAS
measured force, drive side
F LcBS
measured force, operating side
F CAS
Cylinder power, drive side
F CBS
Cylinder power, operating side
ΔF LC
Differential rolling force
ΔF REF
Reference value of differential rolling force
F SREF
Force reference values of the side guides
F SACT
current pressure forces of the side guides
F WHAT
Rolling forces per drive side
F WBS
Rolling forces per operating side
F 1 , F 2
Forces on the side guides

Claims (10)

  1. Method of hot rolling rolling stock in a hot strip train or in Steckel trains, wherein the rolls of at least one roll stand are pivoted for the purpose of regulating the course of the rolling stock and a lateral pressing pressure is exerted against the rolling stock, characterised in that for selective influencing - at at least one roughing stand (1) - of the pre-strip geometry in the rolling-out of slabs (4) to form pre-strips (5)
    - a pivot regulation RAC (20) for dynamic adjustment in the roughing stand and
    - a positional regulation (35) and force regulation (45) of quick and powerful lateral guides (8, 9), which are arranged in front of and behind the roughing stand (1) and for the control of which use is made of the piston position and piston pressure of the piston/cylinder units (12) adjusting the lateral guides (8, 9),
    are carried out linked together in such a manner that a cambered or wedge-shaped slab (4) is reshaped into a straight and wedge-free pre-strip (5) selectively in one or more passes and in reversing or continuous operation.
  2. Method according to claim 1, characterised in that the dynamic adjustment is carried out by means of the pivot regulation (RAC (Roll Alignment Control)) (20), wherein a reference pivot value (ΔSRAC) is calculated from a measured differential rolling force (ΔFLC) and a reference value of the differential rolling force (ΔFREF) with consideration of a maximum pivot value (ΔSRACMAX) and half thereof is used as an additional target value (reference position (SREF)) for the separate positional regulations (25) of the drive side (AS) and operating side (BS) of the roughing stand (1).
  3. Method according to claim 1 or 2, characterised in that lateral guides (8, 9) arranged in front of and behind the roughing stand (1) are held by the piston/cylinder units (12) on each side parallel to and at the same spacing from the stand centre, wherein apart from the positional regulation (35) also a force regulation (45) is carried out.
  4. Method according to claim 3, characterised in that the positional regulation (35) of the lateral guides (8, 9) is carried out in such a manner that the lateral spacing of the lateral guides (8, 9) is different from and somewhat larger than the strip width, for example at the inlet side strip width plus 10 millimetres and at the outlet side strip width plus 40 millimetres.
  5. Method according to claim 3 or 4, characterised in that the lateral guides (8, 9) are laterally pressed by a defined force (F1, F2) against the slab (4) or pre-strip (5) through the force regulation (45) and in that case are protected against overloading.
  6. Method according to claim 5, characterised in that in the case of a possible deviation of the lateral guides (8, 9) the force target value (FSACT) of the force regulation (45) is appropriately increased by a position monitoring.
  7. Method according to one or more of claims 1 to 6, characterised in that the pivot regulation (20) and the regulations (35, 45) of the lateral guides (8, 9) are so coupled with one another that in the case of extreme geometry errors in the rolling stock entering the roughing stand (1) the desired geometry change can be carried out over several passes.
  8. Method according one or more of claims 1 to 7, characterised in that for distribution of the correction of the slab geometry to several passes the instantaneous values of a roll stand for
    - the differential rolling force ΔFLC
    - the differential position of the differential pivot value SSACT
    - the positions of the lateral guides SSACT
    - the pressure forces of the lateral guides FSACT
    are entered into a coupling regulating unit (50) from which then the preset values of
    - a reference value of the differential rolling force ΔSRACMAX
    - a maximum pivot value ΔSRACMAX
    - the position reference values of the lateral guides SSFREF
    - the force reference values of the lateral guides FSREF
    to be used in the succeeding roll stand are then derived.
  9. Device for hot rolling of rolling stock in a conventional hot strip train or in Steckel trains, wherein at least one roll stand is constructed with pivotable rolls and has at the rolling stock entry side a device by which a lateral pressing pressure can be exerted against the rolling stock, particularly for performance of the method according to one or more of claims 1 to 8, characterised in that for hot rolling of slabs (4) to form pre-strips (5) at least one roughing stand (1)
    - is constructed with a pivot regulation (20) and
    - lateral guides (8, 9), which are hydraulically adjustable by means of piston/cylinder units (12), with a positional regulation (35) and force regulation (45) are arranged at the rolling stock entry and the rolling stock exit of the roughing stand (1),
    wherein the pivot regulation (20) of the roughing stand (1) and the positional regulation (35) and force regulation (45) are so linked with one another in terms of measurement and regulation that a cambered or wedge-shaped slab (4) is reshaped into a straight and wedge-free pre-strip (5) selectively in one or more passes and in reversing or continuous operation.
  10. Device according to claim 9, characterised in that the spacing of the lateral guides (8) is widened in wedge-shape at the front ends thereof, i.e. the slab entry side. 1.
EP06742867A 2005-05-11 2006-05-10 Process and device for intentionally influencing the geometry of roughed-down strips in a roughing-down stand Active EP1896200B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005021769A DE102005021769A1 (en) 2005-05-11 2005-05-11 Method and device for selectively influencing the Vorbandgeometrie in a roughing stand
PCT/EP2006/004392 WO2006119984A1 (en) 2005-05-11 2006-05-10 Process and device for intentionally influencing the geometry of roughed-down strips in a roughing-down stand

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EP1896200A1 EP1896200A1 (en) 2008-03-12
EP1896200B1 true EP1896200B1 (en) 2011-07-20

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EP (1) EP1896200B1 (en)
JP (1) JP5253153B2 (en)
KR (1) KR101138726B1 (en)
CN (1) CN101175582B (en)
AT (1) ATE516897T1 (en)
AU (1) AU2006245966B2 (en)
BR (1) BRPI0607449A8 (en)
CA (1) CA2604503C (en)
DE (1) DE102005021769A1 (en)
ES (1) ES2367139T3 (en)
MX (1) MX2007014109A (en)
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UA (1) UA91533C2 (en)
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ES2367139T3 (en) 2011-10-28
US8429943B2 (en) 2013-04-30
BRPI0607449A2 (en) 2009-09-01
EP1896200A1 (en) 2008-03-12
RU2368443C2 (en) 2009-09-27
RU2007126472A (en) 2009-01-20
AU2006245966A1 (en) 2006-11-16
TW200702078A (en) 2007-01-16
AU2006245966B2 (en) 2010-09-30
CN101175582B (en) 2011-04-13
CN101175582A (en) 2008-05-07
ATE516897T1 (en) 2011-08-15
CA2604503A1 (en) 2006-11-16
DE102005021769A1 (en) 2006-11-23
MX2007014109A (en) 2008-02-05
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UA91533C2 (en) 2010-08-10
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CA2604503C (en) 2012-11-06
JP5253153B2 (en) 2013-07-31
WO2006119984A1 (en) 2006-11-16
TWI358332B (en) 2012-02-21
US20090044587A1 (en) 2009-02-19
ZA200705219B (en) 2008-05-28

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