EP0763391B1 - Method of compensating forces resulting from horizontal movements of the rolls in a rolling stand - Google Patents

Method of compensating forces resulting from horizontal movements of the rolls in a rolling stand Download PDF

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Publication number
EP0763391B1
EP0763391B1 EP96113055A EP96113055A EP0763391B1 EP 0763391 B1 EP0763391 B1 EP 0763391B1 EP 96113055 A EP96113055 A EP 96113055A EP 96113055 A EP96113055 A EP 96113055A EP 0763391 B1 EP0763391 B1 EP 0763391B1
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EP
European Patent Office
Prior art keywords
forces
rolling
rolls
roll
axial forces
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Expired - Lifetime
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EP96113055A
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German (de)
French (fr)
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EP0763391A1 (en
Inventor
Wolfgang Prof. Dr. Rohde
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SMS Siemag AG
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SMS Demag 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
    • 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
    • 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
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
    • B21B38/105—Calibrating or presetting roll-gap
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/30—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 plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—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 plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • 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

Definitions

  • the invention relates to a method for compensating forces or force components, resulting from horizontal movements of the rolls in roll stands for the hot and cold rolling of flat products, equipped with work rolls and with one or more backup rolls, with hydraulic adjustments and with Force measuring devices on the opposite side of the roll gap and with hydraulic devices for the horizontal displacement of the work rolls.
  • Figure 1 of the present application documents describes the basic problem of volatile and stray axial forces, for example on the upper one Back-up roller 1 of a four-high stand.
  • the horizontally acting forces T are line-volatile Vectors, that is, they can be shifted along their line of action become. It is therefore irrelevant on which side of the stand the roller is locked.
  • Such pairs of forces always arise from the axial force in the contact area to the neighboring roller.
  • the individual forces overlap and express themselves in different axial forces on all the rollers involved correspondingly difficult to overlook reaction forces in the roll stands.
  • reaction forces show in the roll stands extremely adverse effects.
  • the screwing direction of all the rollers involved also changes.
  • the rollers are running to the opposite side, which results in a reversal of the axial forces Has.
  • the reaction forces in the roll stands change accordingly with the result that the force measuring devices arranged in the stands Report changes that are not related to the actual rolling process stand.
  • the result is incorrect reactions of all control loops, which are carried out by the forces measured on the roll stands, such as the flatness control, the automatic calibration for parallel setting of the roll gap, the roll Alignment control to compensate for the effects of an off-center position of the Rolled product and other control loops, depending on the type of roll stand and the Rolled product.
  • the invention opens up the possibility of all in one roll stand occurring vagabond forces from horizontal movements of the Rolls to determine continuously and the resulting To compensate for force components in the measured rolling forces. Further Embodiments of the invention are the subject of claims 2 to 7.
  • Modern mill stands for cold and hot rolled flat products today almost exclusively with hydraulic adjustments 2 as Thickness control actuator equipped.
  • the pitch cylinders the hydraulic adjustment are above the upper one Back-up roll chocks 3 or below the lower back-up roll chocks 4.
  • Figure 2 shows an analysis of the forces in a roll stand. Recorded only the forces F from the rolling process and the axial forces T of the rollers. On the representation of balancing forces, Bending and weight forces have been omitted because of the compensation of these forces is known.
  • Figure 3 shows the composition of the equation set.
  • the derivation of a center deviation is of particular interest X for the position of the resulting rolling force in the roll gap (see Fig. 2).
  • This size can also be determined from the six measured values in the Derive rolling operation continuously.
  • the equation for the center deviation X is indicated in Fig. 3.
  • the size X can be used are used for automatic calibration, i.e. for the automatic Parallel positioning of the two work rolls by changing the rolls the stand is pre-tensioned with rolling rollers without rolling stock and the eccentricity X calculated from the six measured values becomes.
  • the Value X regulated to zero with the result of a flawless Parallel position of the upper and lower roller.
  • the center deviation X can be used to report such Events and used for a corresponding correction become.
  • the automatic calibration and monitoring of the rolling process can also take place in that instead of introducing a center deviation, the measured forces F 1 to F 4 are corrected (compensated) with the help of the calculable reaction forces from the axial forces.
  • the equations required for this for the sum of the reaction forces from all the rolls involved are indicated by R 1 to R 4 in FIG. 4.
  • the measured values F 1 to F 4 can be used in a manner known per se by forming the difference F 1 minus F 2 or F 3 minus F 4 for the roll calibration and for monitoring the rolling process.
  • Figure 4 shows the equation set for the reaction forces from the Axial forces and for the reaction forces from the eccentricity the rolling force.
  • FIG. 5 contains a calculation example with assumed roll stand data and rolling data and the data from them using the above Equations calculated roller axial forces and reaction forces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

Compensation method is one in which the pressure in two adjustment cylinders for the determination of the rolling forces on one side of the roller gap, and the indicated forces of the force measuring devices to determine the rolling forces on the opposite side of the roller gap are co-ordinated. By including the working roller axial forces determinable by the pressure in the displacement cylinders of the working rollers, the total axial forces (T) in the plant can be determined by calculation during the operation of the rollers.

Description

Die Erfindung betrifft ein Verfahren zur Kompensation von Kräften bzw. Kraftanteilen, resultierend aus Horizontalbewegungen der Walzen in Walzgerüsten für das Warm- und Kaltwalzen von Flachprodukten, ausgerüstet mit Arbeitswalzen und mit einer oder mehreren Stützwalzen, mit hydraulischen Anstellungen und mit Kraftmesseinrichtungen auf der gegenüberliegenden Seite des Walzspaltes und mit hydraulischen Einrichtungen zur Horizontalverschiebung der Arbeitswalzen.The invention relates to a method for compensating forces or force components, resulting from horizontal movements of the rolls in roll stands for the hot and cold rolling of flat products, equipped with work rolls and with one or more backup rolls, with hydraulic adjustments and with Force measuring devices on the opposite side of the roll gap and with hydraulic devices for the horizontal displacement of the work rolls.

Bei der Walzung von Flachprodukten in Warm- und Kaltwalzanlagen besteht das Problem, daß alle beteiligten Walzen während des Walzprozesses in unterschiedlicher Richtung axial im Gerüst verlaufen und durch Andrücken an die jeweils vorhandenen Verriegelungen Axialkräfte erzeugen. Aus diesen Axialkräften entstehen mit der zugeordneten Reaktionskraft im Abstand von Walzmitte bis zur Berührung mit der Nachbarwalze freie Kräftepaare. Jedes dieser Kräftepaare bewirkt Reaktionskräfte in den Walzenlagern und damit in den beiden Ständerräumen des Gerüstes.This applies to the rolling of flat products in hot and cold rolling plants Problem that all the rolls involved in the rolling process in different Axial direction in the scaffold and by pressing on the existing one Interlocks generate axial forces. These axial forces result with the assigned reaction force at a distance from the center of the roll to the point of contact free pairs of forces with the neighboring roller. Each of these pairs of forces causes reaction forces in the roller bearings and thus in the two stand spaces of the stand.

Es ist bereits Stand der Technik, im Gerüst entstehende vertikale Kräfte, beispielsweise Kräfte aus den Eigengewichten, der Walzenbalancierung und der Walzenbiegung rechnerisch oder meßtechnisch zu erfassen und bei der Messung der Kräfte in den beiden Walzenständern zu berücksichtigen. Solche Kompensationen werden jedoch für die Reaktionskräfte aus den beschriebenen Axialkräften der Walzen nicht durchgeführt.It is already state of the art, for example, vertical forces arising in the framework Forces from the dead weights, the roller balancing and the Roll bending to be calculated or measured and during measurement of the forces in the two roll stands. Such compensations are however for the reaction forces from the described axial forces the rollers are not performed.

In dem vorveröffentlichten Dokument GB 20 41 269 A wird ein Sechs-Walzengerüst beschrieben, bei welchem die Zwischenwalzen gegensinnig verschoben werden. Aus der Walzenverschiebung resultieren Kräfte und Momente, die auf das Walzgerüst einwirken und ausgeregelt werden müssen. Hierzu ist ein Regelkreis vorgesehen, bei welchem die Walzkräfte der unteren Stützwalze auf beiden Seiten gemessen werden und ein Mittelwert gebildet wird. Ferner werden die hydraulischen Kräfte der Verstellzylinder gemessen und gemittelt. Die gemittelten Kräfte werden gegebenenfalls unter Einbeziehung eines Sollwertes einem Regler zugeführt, der als Stellgröße die motorisch betätigte Anstellung der oberen Stützwalzen beeinflußt. Dabei kommt es nicht darauf an, ob die Anstellung der Stützwalzen elektromechanisch oder hydraulisch erfolgt. Eine Kompensation von linienflüchtigen und vagabundierenden Axialkräfte an den Walzen und deren Reaktionskräfte ist mit diesem vorbekannten Regelverfahren nicht beabsichtigt und nicht möglich.In the previously published document GB 20 41 269 A, a six-roll stand described, in which the intermediate rolls shifted in opposite directions become. Forces and moments result from the roller displacement, that act on the roll stand and must be corrected. This is a Control loop is provided, in which the rolling forces of the lower support roller measured on both sides and an average is formed. Furthermore the hydraulic forces of the adjusting cylinders are measured and averaged. The averaged Forces are combined with a target value if necessary Controller supplied, the manipulated variable, the motorized adjustment of the upper Back-up rolls affected. It does not matter whether the employment of Back-up rolls are carried out electromechanically or hydraulically. A compensation of linear and vagabond axial forces on the rollers and their reaction forces is not intended with this previously known control method and not possible.

Figur 1 der vorliegenden Anmeldungsunterlagen beschreibt das Grundproblem von linienflüchtigen und vagabundierenden Axialkräfte beispielhaft an der oberen Stützwalze 1 eines Quarto-Gerüstes. Die horizontal wirkenden Kräfte T sind linienflüchtige Vektoren, das heißt, sie können längs ihrer Wirkungslinie verschoben werden. Demzufolge ist es belanglos, auf welcher Seite des Gerüstes die Walze verriegelt ist. Grundsätzlich entstehen solche Kräftepaare immer durch die Axialkraft im Kontaktbereich zur Nachbarwalze. Die einzelnen Kräfte überlagern sich und äußern sich in unterschiedlichen Axialkräften an allen beteiligten Walzen mit entsprechend schwer zu übersehenden Reaktionskräften in den Walzenständern. Figure 1 of the present application documents describes the basic problem of volatile and stray axial forces, for example on the upper one Back-up roller 1 of a four-high stand. The horizontally acting forces T are line-volatile Vectors, that is, they can be shifted along their line of action become. It is therefore irrelevant on which side of the stand the roller is locked. Such pairs of forces always arise from the axial force in the contact area to the neighboring roller. The individual forces overlap and express themselves in different axial forces on all the rollers involved correspondingly difficult to overlook reaction forces in the roll stands.

Insbesondere bei Reversiergerüsten zeigen die Reaktionskräfte in den Walzenständern außerordentlich nachteilige Wirkungen. Bei Umkehrung der Drehrichtung ändert sich auch die Schraubrichtung aller beteiligten Walzen. Die Walzen laufen zur jeweils gegenüberliegenden Seite, was eine Umkehr der Axialkräfte zur Folge hat. Die Reaktionskräfte in den Walzenständern ändern sich entsprechend, mit dem Ergebnis, daß die in den Ständern angeordneten Kraftmeßeinrichtungen Veränderungen melden, die mit dem eigentlichen Walzprozeß nicht in Verbindung stehen. Die Folge sind fehlerhafte Reaktionen aller Regelkreise, die von den in den Walzenständern gemessenen Kräften abhängen, wie die Planheitsregelung, die automatische Kalibrierung zur parallelen Einstellung des Walzspaltes, die Roll Alignment Control zur Kompensation der Wirkungen einer außermittigen Lage des Walzproduktes und weitere Regelkreise, je nach Art des Walzgerüstes und des Walzproduktes.In the case of reversing stands in particular, the reaction forces show in the roll stands extremely adverse effects. When the direction of rotation is reversed the screwing direction of all the rollers involved also changes. The rollers are running to the opposite side, which results in a reversal of the axial forces Has. The reaction forces in the roll stands change accordingly with the result that the force measuring devices arranged in the stands Report changes that are not related to the actual rolling process stand. The result is incorrect reactions of all control loops, which are carried out by the forces measured on the roll stands, such as the flatness control, the automatic calibration for parallel setting of the roll gap, the roll Alignment control to compensate for the effects of an off-center position of the Rolled product and other control loops, depending on the type of roll stand and the Rolled product.

Es besteht die demzufolge die Aufgabe, die Reaktionskräfte in den Walzenständern ohne Einrichtung zusätzlicher Meßstellen im Walzgerüst mit ausreichender Sicherheit zu bestimmen.It is therefore the task of the reaction forces in the roll stands with no additional measuring points in the roll stand Determine security.

Die Lösung der Aufgabe gelingt bei einem Verfahren zur Kompensation von Kräften bzw. Kraftanteilen, resultierend aus Horizontalbewegungen der Walzen in Walzgerüsten gemäß der eingangs genannten Gattung mit den Merkmalen des Anspruchs 1. The problem is solved with a method for compensating forces or force components, resulting from horizontal movements of the rollers in Roll stands according to the type mentioned at the beginning with the features of Claim 1.

Die Erfindung eröffnet die Möglichkeit, alle in einem Walzgerüst auftretenden, vagabundierenden Kräfte aus Horizontalbewegungen der Walzen kontinuierlich zu bestimmen und die hieraus resultierenden Kraftanteile in den gemessenen Walzkräften zu kompensieren. Weitere Ausgestaltungen der Erfindung sind Gegenstand der Ansprüche 2 bis 7.The invention opens up the possibility of all in one roll stand occurring vagabond forces from horizontal movements of the Rolls to determine continuously and the resulting To compensate for force components in the measured rolling forces. Further Embodiments of the invention are the subject of claims 2 to 7.

Die Erfindung wird anhand der Fig. 2 bis Fig. 5 näher beschrieben.The invention is described in more detail with reference to FIGS. 2 to 5.

Moderne Walzgerüste für kalt- und warmgewalzte Flachprodukte werden heute nahezu ausschließlich mit hydraulischen Anstellungen 2 als Stellglied für die Dickenregelung ausgerüstet. Die Anstellzylinder der hydraulischen Anstellung befinden sich oberhalb der oberen Stützwalzeneinbaustücke 3 oder unterhalb der unteren Stützwalzeneinbaustücke 4. In einer bevorzugten Ausführungsform befinden sich zusätzlich auf der vom Walzspalt her gesehen gegenüberliegenden Seite des Gerüstes in den beiden Walzenständern Kraftmeßeinrichtungen 5, mit denen die im Walzprozeß auftretenden Kräfte in den beiden Walzenständern kontinuierlich gemessen werden.Modern mill stands for cold and hot rolled flat products today almost exclusively with hydraulic adjustments 2 as Thickness control actuator equipped. The pitch cylinders the hydraulic adjustment are above the upper one Back-up roll chocks 3 or below the lower back-up roll chocks 4. In a preferred embodiment there are additionally on the opposite one as seen from the roll gap Side of the stand in the two roller stands force measuring devices 5, with which the forces occurring in the rolling process in the two Roll stands can be measured continuously.

Die beiden Hydraulikzylinder der hydraulischen Anstellung liefern über den Hydraulikdruck in bevorzugter Weise zusätzliche Meßwerte für die Kräfte in den beiden Walzenständern, so daß insgesamt ohne zusätzlichen Aufwand Meßwerte für die Kräfte in den beiden Walzenständern oberhalb der oberen Stützwalzeneinbaustücke und unterhalb der unteren Stützwalzeneinbaustücke zur Verfügung stehen.Deliver the two hydraulic cylinders of the hydraulic adjustment Additional measured values in a preferred manner via the hydraulic pressure for the forces in the two roll stands, so that without additional effort Measured values for the forces in the two roll stands above the upper backup roll chocks and below of the lower backup roll chocks are available.

Ein weiteres Merkmal moderner Walzgerüste für das Warm- und Kaltwalzen von Flachprodukten sind verschiebbare Arbeitswalzen 6, z.B. für die Beeinflussung des Walzspaltprofils oder zur Vergleichmäßigung des Walzenverschleißes. In einer bevorzugten Ausführungsform erfolgt das Verschieben der Arbeitswalzen 6 mit Hilfe von Hydraulikzylindern 7. Unabhängig davon, ob während einer Betriebsphase die beiden Arbeitswalzen verschoben werden oder sich in einer bestimmten Position befinden, entstehen in den Hydraulikzylindern 7 Drücke in Abhängigkeit von den von den Arbeitswalzen 6 ausgehenden Axialkräften. Die Axialkräfte der Arbeitswalzen können demzufolge in bevorzugter Weise ohne zusätzlichen Aufwand durch Druckmessung in den Verschiebezylindern bestimmt werden. Hiermit stehen insgesamt sechs Meßwerte für vertikale und horizontale Kräfte im Walzgerüst zur Verfügung.Another feature of modern roll stands for hot and cold rolling of flat products are slidable work rolls 6, e.g. For influencing the roll gap profile or for uniformity of roller wear. In a preferred embodiment moving the work rolls 6 with the help of hydraulic cylinders 7. Regardless of whether the two Work rolls are shifted or shifted in a particular Position, there are 7 pressures in the hydraulic cylinders Dependence on the axial forces emanating from the work rolls 6. The axial forces of the work rolls can therefore in preferably without additional effort by pressure measurement in the displacement cylinders can be determined. Hereby stand overall six measured values for vertical and horizontal forces in the roll stand to disposal.

Figur 2 zeigt eine Analyse der Kräfte in einem Walzgerüst. Aufgenommen wurden lediglich die Kräfte F aus dem Walzprozeß und die Axialkräfte T der Walzen. Auf die Darstellung von Balancierkräften, Biegekräften und Gewichtskräften wurde verzichtet, da die Kompensation dieser Kräfte bekannt ist.Figure 2 shows an analysis of the forces in a roll stand. Recorded only the forces F from the rolling process and the axial forces T of the rollers. On the representation of balancing forces, Bending and weight forces have been omitted because of the compensation of these forces is known.

Der Ansatz der Gleichgewichtsbedingungen für horizontale Kräfte T, vertikale Kräfte F und Momente M am oberen und unteren Walzensatz führt zu insgesamt sechs Gleichungen. Diese sechs nachfolgenden Gleichungen GL geben das Kräftegleichgewicht wie folgt wieder: Gerüst oben vertikale Kräfte F Fw - F1 - F2 = 0 GL (1) horizontale Kräfte T Tw - T1 - T2 = 0 GL (2) Momente M Fw·X - F1· a / 2 + F2· a / 2
- T2 (rA + rS) + Tw (2rA + rS) = 0 GL (3) Gerüst unten vertikale Kräfte F Fw - F3 - F4 = 0 GL (4) horizontale Kräfte T Tw + T3 + T4 = 0 GL (5) Momente M Fw·X - F3· a / 2 + F4· a / 2
- T3 (rA + rS)- Tw (2rA + rS) = 0 GL (6) The equilibrium conditions for horizontal forces T, vertical forces F and moments M at the upper and lower roller set lead to a total of six equations. These six following equations GL represent the balance of forces as follows: Scaffolding on top vertical forces F F w - F 1 - F 2 = 0 GL (1) horizontal forces T T w - T 1 - T 2 = 0 GL (2) Moments M F w · X - F 1 · a / 2 + F 2 · a / 2
- T 2 (r A + r S ) + T w (2r A + r S ) = 0 GL (3) Scaffolding below vertical forces F F w - F 3 - F 4 = 0 GL (4) horizontal forces T T w + T 3 + T 4 = 0 GL (5) Moments M F w · X - F 3 · a / 2 + F 4 · a / 2
- T 3 (r A + r S ) - T w (2r A + r S ) = 0 GL (6)

Aus diesen sechs Gleichungen lassen sich mit mathematischen Umformungen die Gleichungen für die von den Stützwalzen ausgehenden Kräfte T1 und T4 sowie die im Walzspalt auftretende Tangentialkraft Tw bestimmen. Damit sind alle im Gerüst auftretenden horizontal wirkenden Kräfte bekannt.From these six equations, the equations for the forces T 1 and T 4 originating from the support rolls and the tangential force T w occurring in the roll gap can be determined with mathematical transformations. This means that all horizontally acting forces occurring in the scaffolding are known.

Figur 3 zeigt die Zusammenstellung des Gleichungssatzes.Figure 3 shows the composition of the equation set.

Von besonderem Interesse ist die Ableitung einer Mittenabweichung X für die Lage der resultierenden Walzkraft im Walzspalt (vgl. Fig. 2). Diese Größe läßt sich ebenfalls aus den sechs Meßwerten im Walzbetrieb kontinuierlich ableiten. Die Gleichung für die Mittenabweichung X ist in Fig. 3 angegeben. Die Größe X kann herangezogen werden für die automatische Kalibrierung, d.h. für das automatische Parallelstellen der beiden Arbeitswalzen, indem nach einem Walzenwechsel das Gerüst ohne Walzgut mit drehenden Walzen vorgespannt und die aus den sechs Meßwerten errechnete Außermittigkeit X errechnet wird. Durch Schwenken mit der hydraulischen Anstellung wird der Wert X auf Null geregelt mit dem Ergebnis einer einwandfreien Parallellage von oberer und unterer Walze.The derivation of a center deviation is of particular interest X for the position of the resulting rolling force in the roll gap (see Fig. 2). This size can also be determined from the six measured values in the Derive rolling operation continuously. The equation for the center deviation X is indicated in Fig. 3. The size X can be used are used for automatic calibration, i.e. for the automatic Parallel positioning of the two work rolls by changing the rolls the stand is pre-tensioned with rolling rollers without rolling stock and the eccentricity X calculated from the six measured values becomes. By swiveling with the hydraulic adjustment the Value X regulated to zero with the result of a flawless Parallel position of the upper and lower roller.

Eine weitere Verwendung der Mittenabweichung X ist die Überwachung des Walzprozesses, insbesondere bei Reversiergerüsten, bei denen ein Verlaufen des Bandes bzw. des Bleches aus der Gerüstmitte eintreten kann. Die Mittenabweichung X kann zur Meldung solcher Ereignisse und zu einer entsprechenden Korrektur herangezogen werden.Monitoring is another use of the center deviation X. of the rolling process, particularly in the case of reversing stands, in which the strip or sheet runs from the center of the scaffold can occur. The center deviation X can be used to report such Events and used for a corresponding correction become.

Selbstverständlich kann die automatische Kalibrierung und Überwachung des Walzprozesses auch dadurch erfolgen, daß anstelle der Einführung einer Mittenabweichung eine Korrektur (Kompensation) der gemessenen Kräfte F1 bis F4 mit Hilfe der errechenbaren Reaktionskräfte aus den Axialkräften erfolgt. Die hierzu erforderlichen Gleichungen für die Summe der Reaktionskräfte aus allen beteiligten Walzen sind mit R1 bis R4 in Figur 4 angegeben. Nach einer solchen Kompensation können die Meßwerte F1 bis F4 in an sich bekannter Weise durch Differenzbildung F1 minus F2 bzw. F3 minus F4 für die Walzenkalibrierung und für die Überwachung des Walzprozesses herangezogen werden.Of course, the automatic calibration and monitoring of the rolling process can also take place in that instead of introducing a center deviation, the measured forces F 1 to F 4 are corrected (compensated) with the help of the calculable reaction forces from the axial forces. The equations required for this for the sum of the reaction forces from all the rolls involved are indicated by R 1 to R 4 in FIG. 4. After such compensation, the measured values F 1 to F 4 can be used in a manner known per se by forming the difference F 1 minus F 2 or F 3 minus F 4 for the roll calibration and for monitoring the rolling process.

In den Gleichungen zur Bestimmung der Walzen-Axialkräfte und der Außermittigkeit zeigt sich als besonders vorteilhaft, daß die Meßwerte für die Axialkräfte im oberen bzw. unteren Gerüstbereich immer als Differenzwerte in die Auswertung eingehen. Dies hat zur Folge, daß die in den Meßwerten enthaltenen Reibungskräfte, insbesondere bei den Meßwerten aus den Anstellzylindern nicht in die Auswertung eingehen, soweit die Reibungskräfte auf beiden Gerüstseiten gleich groß sind. Dies gilt für eine Aufnahme der Meßwerte während beidseitiger Zufahrbewegungen oder beidseitiger Auf fahrbewegungen der hydraulischen Anstellungen. Bei einer Schwenkbewegung würden sich die Reibungskräfte beider Gerüstseiten addieren. Die Meßwertaufnahme während einer Schwenkbewegung ist deshalb im betrieblichen Ablauf zu unterdrücken.In the equations for determining the roller axial forces and the Eccentricity proves to be particularly advantageous in that the Measured values for the axial forces in the upper and lower frame area always be included in the evaluation as difference values. This has to Consequence that the frictional forces contained in the measured values, in particular with the measured values from the pitch cylinders not in the Receive evaluation as far as the frictional forces on both sides of the scaffold are the same size. This applies to a recording of the measured values during double-sided access movements or double-sided opening movements of hydraulic adjustments. With a swivel movement the frictional forces on both sides of the scaffold would add up. The Measurement recording during a swivel movement is therefore in operation Suppress process.

Als vorteilhaft erweist sich auch die Nutzung der gemessenen und errechneten Axialkräfte T1 bis T4 und Tw zur Überwachung des Erhaltungszustandes und der einwandfreien Walzenschliffe. Hoher Verschleißzustand und Fehler im Walzenschliff erhöhen die Verschränkung der Walzen zueinander und führen zu erhöhten Axialkräften. Die Anzeige dieser Kräfte ist demzufolge ein hervorragendes Mittel zur kontinuierlichen Überwachung des Walzwerks.It has also proven to be advantageous to use the measured and calculated axial forces T 1 to T 4 and T w to monitor the state of maintenance and the perfect roller grinding. A high degree of wear and defects in the roller grinding increase the entanglement of the rollers with each other and lead to increased axial forces. The display of these forces is therefore an excellent means of continuously monitoring the rolling mill.

Figur 4 zeigt den Gleichungssatz für die Reaktionskräfte aus den Axialkräften und für die Reaktionskräfte aus der Außermittigkeit der Walzkraft.Figure 4 shows the equation set for the reaction forces from the Axial forces and for the reaction forces from the eccentricity the rolling force.

Figur 5 enthält ein Rechenbeispiel mit angenommenen Walzgerüstdaten und Walzdaten und den hieraus mit Hilfe der oben angegebenen Gleichungen errechneten Walzen-Axialkräfte und Reaktionskräfte.FIG. 5 contains a calculation example with assumed roll stand data and rolling data and the data from them using the above Equations calculated roller axial forces and reaction forces.

Claims (7)

  1. Method for compensation for forces or force components (T) resulting from horizontal movements of the rolls in roll stands for the hot and cold rolling of flat products, equipped with working rolls (6) and with one or more backing rolls (1), with hydraulic adjusting devices (2) and with force measuring devices (5) on the oppositely disposed side of the roll gap and with hydraulic devices (7) for horizontal displacement of the working rolls (6), characterised in that the pressures in the two adjusting cylinders (2) are utilised for determination of the rolling forces (F) on one side of the roll gap and the indicated forces of the force measuring devices (5) are utilised for determination of the roll forces on the opposite side of the roll gap, and that with inclusion of the working roll axial forces (T) determinable by way of the pressures in the displacing cylinders (7) of the working rolls (6) all axial forces in the stand during the rolling operation are determined by computer and correction values for the rolling force indications (F) in the two roll stands are derived from the measured and computed axial forces (T) of the rolls in order to compensate for the reaction forces (R) of the axial forces (T), wherein the elongations associated with the reaction forces (R), which result from the axial forces (T), in the two roll stands are determined by computer and compensated for by corresponding setting of the hydraulic adjusting devices (2).
  2. Method according to claim 1, characterised in that the actual eccentricity (x) of the rolling force (Fw) is determined from the four measured rolling forces (F1 to F4) and the two measured axial forces (T2, T3).
  3. Method according to claim 1 and claim 2, characterised in that the calculated eccentricity (x) of the rolling force (Fw) is regulated to zero during the calibration of the roll stand for the parallel setting of the rolls (1, 6).
  4. Method according to claim 3, characterised in that in the performance of the automatic calibration the six measurement values for rolling forces (F1 to F4) and axial forces (T2, T3) are picked up only during an identically oriented adjusting movement carried out to both sides of the stand.
  5. Method according to claim 1, characterised in that the measured and calculated axial forces (T1 to T4) and the tangential force (Tw) in the roll gap are continuously indicated for monitoring of the maintenance state.
  6. Method according to claim 1, characterised in that after compensation of the rolling force indications (F1 to F4) by the reaction forces (R) computed from the axial forces (T1 to T4) the remaining difference of the rolling force indications in the upper and lower part of the stand is regulated to zero for the parallel setting of the rolls.
  7. Method according to claim 1, characterised in that after compensation of the rolling force indications (F1 to F4) by the reaction forces (R) computed from the axial forces (T1 to T4) the remaining difference of the rolling force indications in the upper and lower part of the stand is drawn upon for continuous monitoring of the rolling process.
EP96113055A 1995-08-18 1996-08-14 Method of compensating forces resulting from horizontal movements of the rolls in a rolling stand Expired - Lifetime EP0763391B1 (en)

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DE19530424 1995-08-18
DE19530424A DE19530424A1 (en) 1995-08-18 1995-08-18 Method for compensating forces on roll stands resulting from horizontal movements of the rolls

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EP0763391B1 true EP0763391B1 (en) 2000-07-26

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US5714692A (en) 1998-02-03
MY120506A (en) 2005-11-30
DE59605639D1 (en) 2000-08-31
DE19530424A1 (en) 1997-02-20
CN1149512A (en) 1997-05-14
CA2182832A1 (en) 1997-02-19
JP4057666B2 (en) 2008-03-05
ATE194932T1 (en) 2000-08-15
CA2182832C (en) 2007-07-31
KR100424527B1 (en) 2004-05-24
RU2194585C2 (en) 2002-12-20
CN1069235C (en) 2001-08-08
EP0763391A1 (en) 1997-03-19
KR970009913A (en) 1997-03-27
TW315331B (en) 1997-09-11
ES2149408T3 (en) 2000-11-01
JPH09103815A (en) 1997-04-22

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