EP1812181A1 - Method and computer program for controlling a rolling process - Google Patents

Method and computer program for controlling a rolling process

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Publication number
EP1812181A1
EP1812181A1 EP06829190A EP06829190A EP1812181A1 EP 1812181 A1 EP1812181 A1 EP 1812181A1 EP 06829190 A EP06829190 A EP 06829190A EP 06829190 A EP06829190 A EP 06829190A EP 1812181 A1 EP1812181 A1 EP 1812181A1
Authority
EP
European Patent Office
Prior art keywords
neutral point
rolling process
metal strip
relative position
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06829190A
Other languages
German (de)
French (fr)
Other versions
EP1812181B1 (en
Inventor
Hartmut Pawelski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1812181A1 publication Critical patent/EP1812181A1/en
Application granted granted Critical
Publication of EP1812181B1 publication Critical patent/EP1812181B1/en
Active legal-status Critical Current
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Classifications

    • 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
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • 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
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • 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
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a method and a computer program for controlling a rolling process, in which a metal strip is flat-rolled by means of at least two rolls.
  • the invention basically relates to all types of rolling processes, such as cold rolling, hot rolling or finish rolling; however, it finds favored use in cold rolling processes.
  • the calculation of the position of the neutral point is only trivial for ideal plastic material and can only be determined for such materials from measurable parameters of the rolling process.
  • the use of the traditionally calculated (relative) position of the neutral point as a criterion for the stability of a rolling process is therefore only possible to a limited extent in non-ideal plastic material, that is to say in particular in the case of elastic-plastic material, such as real metals.
  • the reason for this is that the (relative) position of the neutral point for rolling processes of real metals with the help of measurable rolling parameters can traditionally only be determined very vaguely.
  • the invention has the object, a known method and computer program for controlling a rolling process in accordance with the relative position of the neutral point between a roller and a metal strip to be rolled in view of the real behavior of the metal strip during the rolling process improve.
  • the method is characterized in that the magnitude of the plane yield stress k e of the metal strip and the magnitude of the hydrostatic pressure p N H in the neutral point as not directly measurable process parameters each using a mathematical model for the individual rolling process based on a first and a second set of measurable process parameters and that the relative position of the neutral point based on the estimated values for the planar yield stress k e and the hydrostatic pressure p N H on the basis of the first group of measurable process parameters and on the basis of the plane elastic modulus E * of the metal strip and the compressibility K of the metal strip is calculated.
  • the relative position of the neutral point can be calculated much more precisely, that is more realistic and more accurately than in the past. This is especially true because with the consideration of the hydrostatic pressure, the volume compression of the metal strip during the rolling process is included in the calculation of the position of the neutral point. In addition, the springback of the band is considered after passing through the narrowest point of the roll gap. This consideration is especially important for values of the zero lead parameter.
  • the present invention more realistic information about the actual position of the neutral point allows a control device or an operator who observes or controls the rolling process, faster and Intervene more efficiently in the rolling process to ensure its stability.
  • the parameters yield stress and hydrostatic pressure in the neutral point are required for more precise calculation of the relative position of the neutral point, but are not easily measurable as measurement parameters during the rolling process, they are inventively using a mathematical model, which can be individually adapted to each individual rolling process is, simulated and preferably calculated in real time to be available in time for the calculation of the real position of the neutral point.
  • a mathematical model which can be individually adapted to each individual rolling process is, simulated and preferably calculated in real time to be available in time for the calculation of the real position of the neutral point.
  • process parameters which can be measured during the rolling process are used as input variables for the mathematical model.
  • the relative position ⁇ of the neutral point is advantageously calculated according to the following formula:
  • P N the pressure in the nip at the neutral point perpendicular (normal) to the metal strip
  • q N the pressure in the nip at the neutral point in the longitudinal direction of the metal strip
  • k e the plane yield stress
  • the rolling process is classified as stable running if the calculated value ⁇ for the relative position of the neutral point is between a lower one
  • the relative position of the neutral point calculated according to the invention is preferably stored over its passage of time. Regardless of this, it is advantageous for rapid initiation of measures to stabilize the rolling process or for removal of excessively high frictional forces in the nip if the relative position of the neutral point calculated according to the invention is illustrated on a display device, preferably in real time, for an operator.
  • FIG. 1 shows a pair of rollers for forming a roll gap with carried metal strip.
  • FIG. 2 shows a block diagram for illustrating the method according to the invention.
  • FIG. 1 shows a roll stand with a pair of rolls, in which the rolls 200 are arranged vertically one above the other and wherein between the two rolls 200 a roll gap is formed.
  • a metal strip 100 is pushed through the nip while being flat-rolled.
  • Both the upper and the lower (working) roller 200 touches the metal strip 100 in a contact arc, which is represented in the upper roller 200 by the arc length of the angle ⁇ .
  • the neutral point is designated by the reference symbol N by way of example.
  • the neutral point indicates the position on the circumference of a roller at which the peripheral speed the roller coincides with the speed of the rolled material, in particular the rolled metal strip.
  • the material flow direction is indicated in Figure 1 by the horizontal arrows; it runs from left to right there.
  • the parameter R denotes the radius of the roll 200
  • the parameter VE denotes the speed of the metal strip 100 at the entrance of the roll gap
  • the parameter v A denotes the speed of the metal strip at the exit of the roll gap
  • the parameter VN denotes the speed of the metal strip 100 at the level of the roll neutral point N. All other parameters shown in FIG. 1 are explained in more detail below.
  • An assessment of the stability of a rolling process and a decision to initiate measures to stabilize the rolling process can be made the more accurate the more precise or realistic the current position of the neutral point is known.
  • PN the pressure in the nip in the neutral point perpendicular (normal) to the metal strip
  • q N the pressure in the nip at the neutral point in the longitudinal direction of the metal strip
  • k e the plane yield stress
  • the calculation of the relative position ⁇ of the neutral point takes place in FIG. 2 in block A.
  • the abovementioned parameters flowing into the calculation of ⁇ are also shown in FIG.
  • the lead f s ii P , the height h E of the metal strip at the entrance of the nip, the height hA at the exit of the nip and the belt tension ⁇ A at the exit of the nip form a first set of process parameters, which directly at any time during a rolling process are measurable.
  • the plane elastic modulus E * of the metal strip 100 and the compressibility K of the metal strip are known in principle.
  • the values for the plane yield stress k e and the pressure p N H in the horizontal gap in the neutral point which are still required for calculating the relative position ⁇ of the neutral point according to the invention, are not known in principle and can not be measured during a rolling process means normal to the metal band. Because the latter two parameters are not directly measurable, they are estimated according to the invention on the basis of the first group of parameters and on the basis of a second group of parameters, using a mathematical model for the individual rolling process.
  • the second group of process parameters comprises the strip input voltage ⁇ E at the entrance of the roll gap, the roll force F, the width of the metal strip b, the radius R 0 of the (working) roll 200 and the flat elastic modulus E * R of the roll.
  • the process parameters of the second group can also be measured individually during a rolling process so that the sought values for the plane yield stress k e and for the pressure p N H in the nip in the neutral point perpendicular to the metal strip can be calculated solely from measurable parameters.
  • the calculation is preferably carried out in real time so that the values for ⁇ are as up-to-date as possible, in order to enable a targeted and effective intervention in the rolling process, if necessary.
  • FIG. 3 illustrates various ranges for possible relative positions ⁇ of the neutral point in the nip between the two rollers 200.
  • a hatched area is identified, which is limited by a lower threshold value of approx. 0.12 and an upper threshold value of 0.4 for the value of ⁇ . If ⁇ is in the shaded area, that is, in terms of value between the upper and lower threshold, then the rolling process is classified as stable; then no measures need to be taken to intervene stabilizing in the rolling process.
  • the rolling process has to be stabilized by suitable measures, whereby the extent of the measures (possibly also in combination) depends on the degree of instability.
  • a stabilization of the rolling process can be achieved by increasing the strip tension ⁇ A at the outlet of the roll gap, by reducing the strip tension OE at the entrance of the roll gap and / or by increasing the friction in the roll gap. The latter can be achieved, for example, by increasing the roughness of the roller 200, be achieved by reducing the amount of lubricant and / or by reducing the rolling speed.
  • a remedy here can be appropriate measures, such as a reduction of the strip tension OA at the exit of the roll gap, an increase in the strip tension ⁇ at the entrance of the roll gap and / or a reduction in the friction between roll 200 and metal strip 100.
  • a reduction in friction can be realized by reducing the roughness of the roll, by increasing the amount of lubricant and / or by increasing the rolling speed.
  • the measures referred to in this paragraph may also be used individually or in combination, depending on the intensity required.
  • the measures just discussed may be initiated either automatically or by an operator according to the calculated value for the neutral point position ⁇ . If the intervention is to be initiated by an operator, it is helpful if the respective current position of the neutral point in a representation similar to Figure 3 is visualized for the operator on a display device. The operator can then immediately recognize on the basis of the illustrated current position ⁇ of the neutral point, whether the rolling process is currently stable, unstable or unstable and, depending on appropriate cause appropriate measures.
  • the value ⁇ is stored in its time course.
  • the inventive calculation of the value ⁇ for the neutral position of the point is realized in a computer program for a control device for controlling a rolling process.

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

Abstract

The invention relates to a method for controlling a rolling process, in which a metal strip is rolled flat by use of at least one roller. It is known from the prior art that the relative position of a neutral point represents a measure of the instantaneous stability of a rolling process. However, traditional methods for calculating the position of the neutral point do not accurately represent the actual properties of metal and therefore have only limited usefulness for predicting the stability of a rolling process. In order to allow better control of a rolling process for rolling a metal strip with regard to the actual behavior of the metal strip, the invention proposes a new method for calculating the relative position of the neutral point, in which in particular the flat yield stress ke and the hydrostatic pressure pNH at the neutral point are incorporated.

Description

Verfahren und Computerprogramm zum Steuern eines WalzprozessesMethod and computer program for controlling a rolling process
Die Erfindung betrifft ein Verfahren und ein Computerprogramm zum Steuern eines Walzprozesses, bei dem ein Metallband mithilfe von mindestens zwei Walzen flachgewalzt wird. Die Erfindung betrifft grundsätzlich alle Arten von Walzprozessen, wie zum Beispiel Kaltwalzen, Warmwalzen oder Fertigwalzen; sie findet jedoch bevorzugte Anwendung bei Kaltwalzprozessen.The invention relates to a method and a computer program for controlling a rolling process, in which a metal strip is flat-rolled by means of at least two rolls. The invention basically relates to all types of rolling processes, such as cold rolling, hot rolling or finish rolling; however, it finds favored use in cold rolling processes.
Im Stand der Technik, zum Beispiel aus der japanischen Patentanmeldung JP 55061309 A ist ein derartiges Verfahren grundsätzlich bekannt. Es wird dort beschrieben, dass die Stabilität des Walzprozesses von der jeweiligen Lage eines so genannten neutralen Punktes abhängt. Dabei bezeichnet der neutrale Punkt diejenige Position auf dem Umfang einer Arbeitswalze, bei dem die Um- fangsgeschwindigkeit der Arbeitswalze mit der Geschwindigkeit des gewalzten Materials übereinstimmt. Zur Gewährleistung der Stabilität des Walzprozesses lehrt die besagte japanische Patentanmeldung, den Bandzug so zu regeln, dass die Lage des neutralen Punktes immer innerhalb eines Kontaktbogens zwischen der Walze und dem gewalzten Material liegt.In the prior art, for example, from Japanese Patent Application JP 55061309 A, such a method is basically known. It is described there that the stability of the rolling process depends on the respective position of a so-called neutral point. Here, the neutral point refers to that position on the circumference of a work roll in which the peripheral speed of the work roll coincides with the speed of the rolled material. To ensure the stability of the rolling process, the said Japanese patent application teaches to regulate the strip tension so that the position of the neutral point always lies within a contact arc between the roller and the rolled material.
Die Berechnung der Lage des neutralen Punktes ist allerdings nur für idealplastisches Material trivial und kann nur für derartige Materialien aus messbaren Parametern des Walzprozesses ermittelt werden. Die Verwendung der traditionell berechneten (relativen) Lage des neutralen Punktes als Kriterium für die Stabilität eines Walzprozesses ist deshalb bei nicht-ideal-plastischem Material, das heißt insbesondere bei elastisch-plastischem Material, wie zum Beispiel bei realen Metallen, nur eingeschränkt möglich. Der Grund dafür besteht darin, dass die (relative) Lage des neutralen Punktes für Walzprozesse von realen Metallen mithilfe von messbaren Walzparametem traditionell nur recht un- genau bestimmt werden kann. Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein bekanntes Verfahren und Computerprogramm zum Steuern eines Walzprozesses nach Maßgabe der relativen Lage des neutralen Punktes zwischen einer Walze und einem zu walzenden Metallband im Hinblick auf das reale Verhalten des Metallbandes während des Walzprozesses zu verbessern.The calculation of the position of the neutral point, however, is only trivial for ideal plastic material and can only be determined for such materials from measurable parameters of the rolling process. The use of the traditionally calculated (relative) position of the neutral point as a criterion for the stability of a rolling process is therefore only possible to a limited extent in non-ideal plastic material, that is to say in particular in the case of elastic-plastic material, such as real metals. The reason for this is that the (relative) position of the neutral point for rolling processes of real metals with the help of measurable rolling parameters can traditionally only be determined very vaguely. Based on this prior art, the invention has the object, a known method and computer program for controlling a rolling process in accordance with the relative position of the neutral point between a roller and a metal strip to be rolled in view of the real behavior of the metal strip during the rolling process improve.
Diese Aufgabe wird durch das in Patentanspruch 1 beanspruchte Verfahren gelöst. Das Verfahren ist dadurch gekennzeichnet, dass die Größe der ebenen Fließspannung ke des Metallbandes und die Größe des hydrostatischen Druckes pN H in dem neutralen Punkt als nicht direkt messbare Prozessparameter jeweils mithilfe eines mathematischen Modells für den individuellen Walzpro- zess auf Basis einer ersten und einer zweiten Gruppe von messbaren Prozessparametern geschätzt werden und dass die relative Lage des neutralen Punktes auf Basis der geschätzten Größen für die ebene Fließspannung ke und den hydrostatischen Druck pN H auf Basis der ersten Gruppe von messbaren Pro- zessparametern sowie auf Basis des ebenen Elastizitätsmoduls E* des Metallbandes und der Kompressibilität K des Metallbandes berechnet wird.This object is achieved by the method claimed in claim 1. The method is characterized in that the magnitude of the plane yield stress k e of the metal strip and the magnitude of the hydrostatic pressure p N H in the neutral point as not directly measurable process parameters each using a mathematical model for the individual rolling process based on a first and a second set of measurable process parameters and that the relative position of the neutral point based on the estimated values for the planar yield stress k e and the hydrostatic pressure p N H on the basis of the first group of measurable process parameters and on the basis of the plane elastic modulus E * of the metal strip and the compressibility K of the metal strip is calculated.
Durch die Berücksichtigung der ebenen Fließspannung des Metallbandes und der Größe des hydrostatischen Druckes in dem neutralen Punkt kann die relati- ve Lage des neutralen Punktes wesentlich präziser, das heißt realitätsnäher und genauer, berechnet werden als dies in der Vergangenheit der Fall war. Dies gilt insbesondere deswegen, weil mit der Berücksichtigung des hydrostatischen Druckes die Volumenkompression des Metallbandes während des Walzprozesses Eingang in die Berechnung der Lage des neutralen Punktes findet. Außerdem wird die Auffederung des Bandes nach Durchlaufen der engsten Stelle des Walzspaltes berücksichtigt. Diese Berücksichtigung ist insbesondere für Werte des Parameters der Voreilung um Null besonders wichtig. Die erfindungsgemäß mögliche realitätsnähere Information über die tatsächliche Lage des neutralen Punktes ermöglicht es einer Steuerungseinrichtung oder einer Bedienperson, welche den Walzprozess beobachtet oder steuert, schneller und effizienter in den Walzprozess einzugreifen, um seine Stabilität zu gewährleisten.By taking into account the even yield stress of the metal strip and the magnitude of the hydrostatic pressure in the neutral point, the relative position of the neutral point can be calculated much more precisely, that is more realistic and more accurately than in the past. This is especially true because with the consideration of the hydrostatic pressure, the volume compression of the metal strip during the rolling process is included in the calculation of the position of the neutral point. In addition, the springback of the band is considered after passing through the narrowest point of the roll gap. This consideration is especially important for values of the zero lead parameter. The present invention more realistic information about the actual position of the neutral point allows a control device or an operator who observes or controls the rolling process, faster and Intervene more efficiently in the rolling process to ensure its stability.
Weil die Parameter Fließspannung und hydrostatischer Druck im neutralen Punkt zwar für die präzisere Berechnung der relativen Lage des neutralen Punktes erforderlich sind, aber während des Walzprozesses nicht einfach als Messparameter messbar sind, werden sie erfindungsgemäß mithilfe eines mathematischen Modells, was individuell auf jeden einzelnen Walzprozess anpassbar ist, simuliert und vorzugsweise in Echtzeit berechnet, um für die Berechnung der realen Lage des neutralen Punktes rechtzeitig zur Verfügung zu stehen. Vorteilhafterweise werden als Eingangsgrößen für das mathematische Modell jedoch lediglich Prozessparameter verwendet, die während des Walzprozesses gemessen werden können.Because the parameters yield stress and hydrostatic pressure in the neutral point are required for more precise calculation of the relative position of the neutral point, but are not easily measurable as measurement parameters during the rolling process, they are inventively using a mathematical model, which can be individually adapted to each individual rolling process is, simulated and preferably calculated in real time to be available in time for the calculation of the real position of the neutral point. Advantageously, however, only process parameters which can be measured during the rolling process are used as input variables for the mathematical model.
Erfindungsgemäß wird die relative Lage ξ des neutralen Punktes vorteilhafter- weise gemäß folgender Formel berechnet:According to the invention, the relative position ξ of the neutral point is advantageously calculated according to the following formula:
wobei fsiip : die Voreilung; σA : die Bandausgangsspannung; where fsiip: the lead; σ A : the tape output voltage;
K : die Kompressibilität des Metallbandes;K: the compressibility of the metal strip;
PN : den Druck im Walzspalt im neutralen Punkt senkrecht (normal) zum Metallband; qN : den Druck im Walzspalt im neutralen Punkt in Längsrichtung des Metallbandes; ke : die ebene Fließspannung;P N : the pressure in the nip at the neutral point perpendicular (normal) to the metal strip; q N : the pressure in the nip at the neutral point in the longitudinal direction of the metal strip; k e : the plane yield stress;
E* : den ebenen Elastizitätsmodul des Metallbandes; hE : die Banddicke am Eingang; und hA : die Banddicke am Ausgang;E * : the plane elastic modulus of the metal strip; h E : the tape thickness at the entrance; and h A : the strip thickness at the exit;
repräsentiert.represents.
Der Walzprozess wird dann als stabil laufend eingestuft, wenn der berechnete Wert ξ für die relative Lage des neutralen Punktes zwischen einem unterenThe rolling process is classified as stable running if the calculated value ξ for the relative position of the neutral point is between a lower one
Schwellenwert von ca. 0,12 und einem oberen Schwellenwert von circa 0,4 liegt.Threshold of about 0.12 and an upper threshold of about 0.4.
Liegt der Wert ξ unterhalb des unteren Schwellenwertes, so ist dies ein Indiz dafür, dass der Walzprozess instabil ist; er ist dann durch geeignete Maßnah- men, wie zum Beispiel die Erhöhung des Bandzugs am Ausgang, eine Reduzierung des Bandzugs am Eingang oder eine Erhöhung der Reibung im Walzspalt wieder zu stabilisieren.If the value ξ is below the lower threshold, this is an indication that the rolling process is unstable; it is then to be stabilized again by suitable measures, such as increasing the strip tension at the exit, a reduction of the strip tension at the entrance or an increase in the friction in the roll gap.
Im anderen Fall, wenn der Wert ξ für die relative Lage des neutralen Punktes oberhalb des oberen Schwellenwertes von circa 0,4 liegt, so ist dies ein Indiz dafür, dass die Reibung im Walzspalt zu hoch und damit der Verschleiß der Walzen ebenfalls zu hoch ist; es ist dann durch geeignete Maßnahmen entsprechend gegenzusteuern.In the other case, if the value ξ for the relative position of the neutral point is above the upper threshold of approximately 0.4, then this is an indication that the friction in the nip is too high and thus the wear of the rollers is also too high ; It must then be counteracted by appropriate measures.
Zu Dokumentationszwecken ist es vorteilhaft, wenn die erfindungsgemäß berechnete relative Lage des neutralen Punktes vorzugsweise über ihren Zeitablauf gespeichert wird. Unabhängig davon ist es für eine schnelle Einleitung von Maßnahmen zur Stabilisierung des Walzprozesses oder für eine Beseitigung von zu hohen Reibkräften im Walzspalt vorteilhaft, wenn die erfindungsgemäß berechnete relative Lage des neutralen Punktes auf einer Anzeigeeinrichtung, vorzugsweise in Echtzeit, für eine Bedienperson veranschaulicht wird.For documentation purposes, it is advantageous if the relative position of the neutral point calculated according to the invention is preferably stored over its passage of time. Regardless of this, it is advantageous for rapid initiation of measures to stabilize the rolling process or for removal of excessively high frictional forces in the nip if the relative position of the neutral point calculated according to the invention is illustrated on a display device, preferably in real time, for an operator.
Weitere vorteilhafte Ausgestaltungen des beanspruchten Verfahrens sind Gegenstand der Unteransprüche. Die oben genannte Aufgabe der Erfindung wird weiterhin durch ein Computerprogramm für eine Steuereinrichtung zum Steuern eines Walzprozesses gemäß dem oben beschriebenen Verfahren gelöst.Further advantageous embodiments of the claimed method are the subject of the dependent claims. The above object of the invention is further achieved by a computer program for a control device for controlling a rolling process according to the method described above.
Der Beschreibung sind insgesamt drei Figuren beigefügt, wobeiThe description is a total of three figures attached, where
Fig. 1 ein Walzenpaar zur Ausbildung eines Walzspaltes mit durchgeführtem Metallband;1 shows a pair of rollers for forming a roll gap with carried metal strip.
Fig. 2 ein Blockschaltbild zur Veranschaulichung des erfindungsgemäßen Verfahrens; und2 shows a block diagram for illustrating the method according to the invention; and
Fig.3 verschiedene mögliche Positionsbereiche für die relative Lage des neutralen Punktes in einem Walzspalt3 different possible position ranges for the relative position of the neutral point in a roll gap
zeigt.shows.
Die Erfindung wird nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben.The invention will be described in detail below with reference to the said figures in the form of embodiments.
Figur 1 zeigt ein Walzgerüst mit einem Walzenpaar, bei dem die Walzen 200 vertikal übereinander angeordnet sind und wobei zwischen den beiden Walzen 200 ein Walzspalt ausgebildet ist. Zum Durchführen eines Walzprozesses wird ein Metallband 100 durch den Walzspalt hindurch geschoben und dabei flachgewalzt. Sowohl die obere wie auch die untere (Arbeits-) Walze 200 berührt dabei das Metallband 100 in einem Kontaktbogen, der bei der oberen Walze 200 durch die Bogenlänge des Winkels α repräsentiert ist.FIG. 1 shows a roll stand with a pair of rolls, in which the rolls 200 are arranged vertically one above the other and wherein between the two rolls 200 a roll gap is formed. To carry out a rolling process, a metal strip 100 is pushed through the nip while being flat-rolled. Both the upper and the lower (working) roller 200 touches the metal strip 100 in a contact arc, which is represented in the upper roller 200 by the arc length of the angle α.
Als Maß bzw. Kriterium für die Stabilität eines individuellen Walzprozesses wird im Rahmen der vorliegenden Erfindung die relative Lage des so genannten neutralen Punktes verwendet. In Figur 1 ist der neutrale Punkt beispielhaft mit dem Bezugszeichen N bezeichnet. Der neutrale Punkt bezeichnet die jenige Position auf dem Umfang einer Walze, bei dem die Umfangsgeschwindigkeit der Walze mit der Geschwindigkeit des gewalzten Materials, insbesondere des gewalzten Metallbandes übereinstimmt.As a measure or criterion for the stability of an individual rolling process, the relative position of the so-called neutral point is used in the context of the present invention. In FIG. 1, the neutral point is designated by the reference symbol N by way of example. The neutral point indicates the position on the circumference of a roller at which the peripheral speed the roller coincides with the speed of the rolled material, in particular the rolled metal strip.
Die Materialflussrichtung ist in Figur 1 durch die horizontalen Pfeile angedeutet; sie verläuft dort von links nach rechts. Der Parameter R bezeichnet den Radius der Walze 200, der Parameter VE bezeichnet die Geschwindigkeit des Metallbandes 100 am Eingang des Walzspaltes, der Parameter vA bezeichnet die Geschwindigkeit des Metallbandes am Ausgang des Walzspaltes und der Parameter VN bezeichnet die Geschwindigkeit des Metallbandes 100 auf Höhe des neutralen Punktes N. Alle weiteren in Figur 1 dargestellten Parameter werden weiter unten näher erläutert.The material flow direction is indicated in Figure 1 by the horizontal arrows; it runs from left to right there. The parameter R denotes the radius of the roll 200, the parameter VE denotes the speed of the metal strip 100 at the entrance of the roll gap, the parameter v A denotes the speed of the metal strip at the exit of the roll gap and the parameter VN denotes the speed of the metal strip 100 at the level of the roll neutral point N. All other parameters shown in FIG. 1 are explained in more detail below.
Eine Einschätzung über die Stabilität eines Walzprozesses und eine Entscheidung über das Einleiten von Maßnahmen zur Stabilisierung des Walzprozesses können um so genauer vorgenommen werden, desto präziser bzw. realitätsnä- her die aktuelle Position des neutralen Punktes bekannt ist.An assessment of the stability of a rolling process and a decision to initiate measures to stabilize the rolling process can be made the more accurate the more precise or realistic the current position of the neutral point is known.
Anhand von Figur 2 wird deshalb das erfindungsgemäße Verfahren erläutert, mit dessen Hilfe eine sehr präzise und realitätsnahe Berechnung der relativen Lage des neutralen Punktes während eines Walzprozesses jederzeit möglich ist.The method according to the invention is therefore explained with reference to FIG. 2, with the aid of which a very precise and realistic calculation of the relative position of the neutral point during a rolling process is possible at any time.
Erfindungsgemäß erfolgt die Berechnung der relativen Lage ξ. des neutralen Punktes N gemäß folgender Formel:According to the calculation of the relative position ξ. of the neutral point N according to the following formula:
wobei fsiip : die Voreilung; σA : die Bandausgangsspannung;where fsiip: the lead; σ A: the tape output voltage;
K : die Kompressibilität des Metallbandes (100);K: the compressibility of the metal strip (100);
PN : den Druck im Walzspalt im neutralen Punkt senkrecht (normal) zum Metallband; qN : den Druck im Walzspalt im neutralen Punkt in Längsrichtung des Metallbandes; ke : die ebene Fließspannung;PN: the pressure in the nip in the neutral point perpendicular (normal) to the metal strip; q N : the pressure in the nip at the neutral point in the longitudinal direction of the metal strip; k e : the plane yield stress;
E* : den ebenen Elastizitätsmodul des Metallbandes (100); hE : die Banddicke am Eingang; und hA : die Banddicke am Ausgang des Walzspaltes;E * : the plane elastic modulus of the metal strip (100); h E : the tape thickness at the entrance; and h A : the strip thickness at the exit of the roll nip;
repräsentiert.represents.
Die Berechnung der relativen Lage ζ des neutralen Punktes erfolgt in Figur 2 in Block A. Dabei sind die in die Berechnung von ξ einfließenden oben genannten Parameter in Figur 2 ebenfalls dargestellt. Von diesen Parametern bilden die Voreilung fsiiP, die Höhe hE des Metallbandes am Eingang des Walzspaltes, die Höhe hA am Ausgang des Walzspaltes sowie die Bandspannung σA am Ausgang des Walzspaltes eine erste Gruppe von Prozessparametern, welche während eines Walzprozesses jederzeit direkt messbar sind. Der ebene Elastizi- tätsmodul E* des Metallbandes 100 sowie die Kompressibilität K des Metallbandes sind grundsätzlich bekannt. Nicht grundsätzlich bekannt und auch nicht messbar während eines Walzprozesses, sind dagegen die für die erfindungsgemäße Berechnung der relativen Lage ξ des neutralen Punktes weiterhin erforderlichen Werte für die ebene Fließspannung ke und den Druck pN H im WaIz- spalt im neutralen Punkt senkrecht, das heißt normal zum Metallband. Weil die beiden letztgenannten Parameter nicht direkt messbar sind, werden sie erfindungsgemäß auf Basis der ersten Gruppe von Parametern sowie auf Basis einer zweiten Gruppe von Parametern, mithilfe eines mathematischen Modells für den individuellen Walzprozess abgeschätzt. Die zweite Gruppe von Prozesspa- rametern umfasst die Bandeingangsspannung σE am Eingang des Walzspaltes, die Walzenkraft F, die Breite des Metallbandes b, den Radius R0 der (Arbeits-) Walze 200 sowie den ebenen Elastizitätsmodul E* R der Walze. Auch die Prozessparameter der zweiten Gruppe sind während eines Walzprozesses individuell messbar, so dass die gesuchten Werte für die ebene Fließspannung ke und für den Druck pN H im Walzspalt im neutralen Punkt senkrecht zum Metall- band somit alleine aus messbaren Parametern berechnet werden können. Die Berechnung erfolgt vorzugsweise in Echtzeit, damit die Werte für ξ möglichst aktuell zur Verfügung stehen, um ein gezieltes und wirkungsvolles Eingreifen in den Walzprozess - falls notwendig - zu ermöglichen.The calculation of the relative position ζ of the neutral point takes place in FIG. 2 in block A. The abovementioned parameters flowing into the calculation of ξ are also shown in FIG. Of these parameters, the lead f s ii P , the height h E of the metal strip at the entrance of the nip, the height hA at the exit of the nip and the belt tension σ A at the exit of the nip form a first set of process parameters, which directly at any time during a rolling process are measurable. The plane elastic modulus E * of the metal strip 100 and the compressibility K of the metal strip are known in principle. By contrast, the values for the plane yield stress k e and the pressure p N H in the horizontal gap in the neutral point, which are still required for calculating the relative position ξ of the neutral point according to the invention, are not known in principle and can not be measured during a rolling process means normal to the metal band. Because the latter two parameters are not directly measurable, they are estimated according to the invention on the basis of the first group of parameters and on the basis of a second group of parameters, using a mathematical model for the individual rolling process. The second group of process parameters comprises the strip input voltage σ E at the entrance of the roll gap, the roll force F, the width of the metal strip b, the radius R 0 of the (working) roll 200 and the flat elastic modulus E * R of the roll. The process parameters of the second group can also be measured individually during a rolling process so that the sought values for the plane yield stress k e and for the pressure p N H in the nip in the neutral point perpendicular to the metal strip can be calculated solely from measurable parameters. The calculation is preferably carried out in real time so that the values for ξ are as up-to-date as possible, in order to enable a targeted and effective intervention in the rolling process, if necessary.
In Figur 3 sind verschiedene Bereiche für mögliche relative Lagen ξ des neutralen Punktes in dem Walzspalt zwischen den beiden Walzen 200 veranschaulicht. Zu erkennen ist zunächst ein schraffierter Bereich, der durch einen unteren Schwellenwert von ca. 0,12 und einen oberen Schwellenwert von 0,4 für den Wert von ξ begrenzt ist. Wenn ξ in dem schraffierten Bereich liegt, das heißt wertmäßig zwischen dem oberen und dem unteren Schwellenwert liegt, dann wird der Walzprozess als stabil eingestuft; es brauchen dann keine Maßnahmen getroffen zu werden, um stabilisierend in den Walzprozess einzugreifen.FIG. 3 illustrates various ranges for possible relative positions ξ of the neutral point in the nip between the two rollers 200. First, a hatched area is identified, which is limited by a lower threshold value of approx. 0.12 and an upper threshold value of 0.4 for the value of ξ. If ξ is in the shaded area, that is, in terms of value between the upper and lower threshold, then the rolling process is classified as stable; then no measures need to be taken to intervene stabilizing in the rolling process.
Anders verhält es sich dagegen, wenn der erfindungsgemäß berechnete Wert zwischen 0,08 und 0,12 liegt; dann wird der Walzprozess als kritisch, das heißt weniger stabil gegenüber Schwankungen der Prozeßparameter eingestuft. Noch kritischer, weil noch instabiler ist der Walzprozess bei noch kleineren Werten von ξ insbesondere bei Werten zwischen 0 und 0,08. In den beiden ge- nannten Fällen von Instabilität ist der Walzprozess durch geeignete Maßnahmen zu stabilisieren, wobei der Umfang der Maßnahmen (evtl. auch in Kombination) von dem Grad der Instabilität abhängt. Eine Stabilisierung des Walzprozesses kann erreicht werden durch eine Erhöhung des Bandzugs σA am Ausgang des Walzspaltes, durch eine Reduzierung des Bandzugs OE am Eingang des Walzspaltes und/oder durch eine Erhöhung der Reibung im Walzspalt. Letztere kann zum Beispiel durch eine Erhöhung der Rauheit der Walze 200, durch eine Reduzierung der Schmiermittelmenge und/oder durch eine Reduzierung der Walzgeschwindigkeit erreicht werden.The situation is different when the value calculated according to the invention is between 0.08 and 0.12; then the rolling process is classified as critical, that is less stable to fluctuations in the process parameters. Even more critical, because even more unstable is the rolling process at even smaller values of ξ especially at values between 0 and 0.08. In the two cases of instability mentioned above, the rolling process has to be stabilized by suitable measures, whereby the extent of the measures (possibly also in combination) depends on the degree of instability. A stabilization of the rolling process can be achieved by increasing the strip tension σ A at the outlet of the roll gap, by reducing the strip tension OE at the entrance of the roll gap and / or by increasing the friction in the roll gap. The latter can be achieved, for example, by increasing the roughness of the roller 200, be achieved by reducing the amount of lubricant and / or by reducing the rolling speed.
Bei Werten von ξ über 0,12, insbesondere bei Werten von ξ zwischen 0,12 und 0,4 ist der Walzprozess überstabil, anschaulich gesprochen ist dann die Reibung im Walzspalt zu groß. Dies hat den Nachteil, dass die auftretenden Kräfte und damit einhergehend der Verschleiß der Walzen zu groß sind. Abhilfe können hier geeignete Maßnahmen, wie eine Reduzierung des Bandzugs OA am Ausgang des Walzspaltes, eine Erhöhung des Bandzugs σε am Eingang des Walzspaltes und/oder eine Reduzierung der Reibung zwischen Walze 200 und Metallband 100 leisten. Eine Reduzierung der Reibung kann durch eine Verringerung der Rauheit der Walze, durch eine Erhöhung der Schmiermittelmenge und/oder durch Erhöhen der Walzgeschwindigkeit realisiert werden. Auch die in diesem Absatz aufgezeigten Maßnahmen können einzeln oder in Kombination angewandt werden, je nach erforderlicher Intensität.At values of ξ over 0.12, in particular at values of ξ between 0.12 and 0.4, the rolling process is unstable; in other words, the friction in the roll gap is too great. This has the disadvantage that the forces occurring and concomitantly the wear of the rollers are too large. A remedy here can be appropriate measures, such as a reduction of the strip tension OA at the exit of the roll gap, an increase in the strip tension σε at the entrance of the roll gap and / or a reduction in the friction between roll 200 and metal strip 100. A reduction in friction can be realized by reducing the roughness of the roll, by increasing the amount of lubricant and / or by increasing the rolling speed. The measures referred to in this paragraph may also be used individually or in combination, depending on the intensity required.
Die soeben diskutierten Maßnamen können nach Maßgabe des berechneten Wertes für die Lage ξ des neutralen Punktes entweder automatisch oder durch eine Bedienperson eingeleitet werden. Wenn die Eingriffe durch eine Bedienperson eingeleitet werden sollen, ist es hilfreich, wenn die jeweils aktuelle Lage des neutralen Punktes in einer Darstellung ähnlich wie Figur 3 für die Bedienperson auf einer Anzeigeeinrichtung visualisiert wird. Die Bedienperson kann dann aufgrund der veranschaulichten aktuellen Lage ξ des neutralen Punktes sofort erkennen, ob der Walzprozess aktuell stabil, instabil oder überstabil verläuft und je nachdem geeignete Maßnahmen veranlassen.The measures just discussed may be initiated either automatically or by an operator according to the calculated value for the neutral point position ξ. If the intervention is to be initiated by an operator, it is helpful if the respective current position of the neutral point in a representation similar to Figure 3 is visualized for the operator on a display device. The operator can then immediately recognize on the basis of the illustrated current position ξ of the neutral point, whether the rolling process is currently stable, unstable or unstable and, depending on appropriate cause appropriate measures.
Zu Dokumentationszwecken ist es vorteilhaft, wenn der Wert ξ in seinem Zeitverlauf gespeichert wird. Vorteilhafterweise wird die erfindungsgemäße Berechnung des Wertes ξ für die neutrale Lage des Punktes in einem Computerprogramm für eine Steuereinrichtung zum Steuern eines Walzprozesses realisiert. For documentation purposes, it is advantageous if the value ξ is stored in its time course. Advantageously, the inventive calculation of the value ξ for the neutral position of the point is realized in a computer program for a control device for controlling a rolling process.

Claims

Patentansprücheclaims
1. Verfahren zum Steuern eines Walzprozesses, bei dem ein Metallband (100) mithilfe von mindestens einer Walze (200) flachgewalzt wird, umfassend: Detektieren der relativen Lage (N) des neutralen Punktes in einem Kontaktbogen zwischen dem Metallband (100) und der Walze (200); und erforderlichenfalls Stabilisieren des Walzprozesses nach Maßgabe der Lage ξ (N) des neutralen Punktes durch Eingreifen mit geeigneten Maßnahmen in den Walzprozess; dadurch gekennzeichnet, dass die Größe der ebenen Fließspannung ke des Metallbandes und die Größe des hydrostatischen Druckes pN H in dem neutralen Punkt als nicht direkt messbare Prozessparameter jeweils mit Hilfe eines mathematischen Modells für den individuellen Walzprozess auf Basis einer ersten und einer zweiten Gruppe von messbaren Prozessparametern geschätzt werden; und die relative Lage ξ (N) des neutralen Punktes auf Basis der geschätztenA method of controlling a rolling process in which a metal strip (100) is flattened by means of at least one roller (200), comprising: detecting the relative position (N) of the neutral point in a contact arc between the metal strip (100) and the roller (200); and, if necessary, stabilizing the rolling process in accordance with the position ξ (N) of the neutral point by intervention with appropriate measures in the rolling process; characterized in that the magnitude of the plane yield stress k e of the metal strip and the magnitude of the hydrostatic pressure p N H in the neutral point as not directly measurable process parameters each using a mathematical model for the individual rolling process based on a first and a second group of be estimated measurable process parameters; and the relative position ξ (N) of the neutral point based on the estimated
Größen für die ebene Fließspannung ke und den hydrostatischen Druck pN H, auf Basis der ersten Gruppe von messbaren Prozessparametern sowie auf Basis des ebenen Elastizitätsmoduls E* des Metallbandes und der Kom- pressiblität K des Metallbandes, berechnet wird.Size for the plane yield stress k e and the hydrostatic pressure p N H , on the basis of the first group of measurable process parameters and on the basis of the flat modulus of elasticity E * of the metal strip and the compressibility K of the metal strip, is calculated.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die erste Gruppe von messbaren Prozessparametern für die Berechnung der ebenen Fließspannung ke, des hydrostatischen Druckes pN H im neutralen Punkt und/oder der relativen Lage ξ (N) des neutralen Punktes die Parameter2. The method according to claim 1, characterized in that the first group of measurable process parameters for the calculation of the plane yield stress k e , the hydrostatic pressure p N H in the neutral point and / or the relative position ξ (N) of the neutral point, the parameters
Voreilung fS|ip, Bandeingangsdicke hE, Bandausgangsdicke hA und Bandausgangsspannung σA des Metallbandes (100) umfasst.Advance f S | ip , band input thickness h E , band output thickness hA and band output voltage σ A of the metal band (100).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zwei- te Gruppe von messbaren Prozessparametern für die Berechnung der ebe- nen Fließspannung ke und/oder des hydrostatischen Druckes PNH im neutralen Punkt die Bandeingangsspannung σE, die Walzenkraft F, die Bandbreite b, den Radius R0 der Walze und den ebenen Elastizitätsmodul E*R der Walze umfasst.3. The method according to claim 1 or 2, characterized in that the second group of measurable process parameters for the calculation of the ebe NEN flow stress k e and / or the hydrostatic pressure PN H in the neutral point, the belt input voltage σ E , the roller force F, the bandwidth b, the radius R 0 of the roller and the flat elastic modulus E * R of the roller.
Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die relative Lage des neutralen Punktes ξ gemäß folgender Formel berechnet wird:Method according to one of the preceding claims, characterized in that the relative position of the neutral point ξ is calculated according to the following formula:
wobei fsιip : die Voreilung;where f s ι ip : the lead;
OA : die Bandausgangsspannung; K : die Kompressibilität des Metallbandes (100);OA: the tape output voltage; K: the compressibility of the metal strip (100);
PN : den Druck im Walzspalt im neutralen Punkt senkrecht (normal) zum Metallband; qN : den Druck im Walzspalt im neutralen Punkt in Längsrichtung desPN: the pressure in the nip in the neutral point perpendicular (normal) to the metal strip; q N : the pressure in the nip at the neutral point in the longitudinal direction of the
Metallbandes; ke : die ebene Fließspannung;Metal strip; k e : the plane yield stress;
E* : den ebenen Elastizitätsmodul des Metallbandes (100); hε : die Banddicke am Eingang; und hA : die Banddicke am Ausgang;E *: the plane elastic modulus of the metal strip (100); hε: the strip thickness at the entrance; and h A : the tape thickness at the exit;
repräsentiert. represents.
5. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass der Walzprozess stabil verläuft und keinen stabilisierenden Eingriff mit geeigneten Maßnahmen erfordert, wenn der berechnete Wert ξ für die relative Lage (N) des neutralen Punktes zwischen einem unteren Schwellenwert von ca. 0,12 und einem oberen Schwellenwert von ca. 0,40 liegt.5. Method according to one of the preceding claims, characterized in that the rolling process is stable and does not require any stabilizing intervention with suitable measures if the calculated value ξ for the relative position (N) of the neutral point lies between a lower threshold value of approx. 12 and an upper threshold of about 0.40.
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Walzprozess durch geeignete Maßnahmen, wie Erhöhung des Bandzugs am Ausgang, Reduzierung des Bandzugs am Eingang oder Er- höhung der Reibung im Walzspalt, z.B. durch Erhöhung der Rauheit der6. The method according to any one of claims 1 to 4, characterized in that the rolling process by suitable measures, such as increasing the strip tension at the exit, reducing the strip tension at the entrance or increasing the friction in the nip, e.g. by increasing the roughness of the
Walze, Reduzierung der Schmiermittelmenge und/oder Reduzierung der Walzgeschwindigkeit, stabilisiert wird, wenn der Wert ξ für die relative Lage des neutralen Punktes zwischen Null und einem unteren Schwellenwert von ca. 0,12 liegt.Roller, reducing the amount of lubricant and / or reducing the rolling speed, stabilized when the value ξ for the relative position of the neutral point between zero and a lower threshold of about 0.12.
7. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Walzprozess durch geeignete Maßnahmen, wie Reduzierung des Bandzugs am Ausgang, Erhöhung des Bandzugs am Eingang oder Reduzierung der Reibung, z.B. durch Verringern der Rauheit der Walze, Erhöhen der Schmiermittelmenge und/oder Erhöhen der Walzgeschwindigkeit, verbessert wird, wenn der Wert ξ für die relative Lage des neutralen Punktes oberhalb eines oberen Schwellenwertes von ca. 0,4 liegt.A method according to any one of claims 1 to 4, characterized in that the rolling process is effected by suitable means, such as reducing the strip tension at the exit, increasing the strip tension at the entrance or reducing the friction, e.g. by reducing the roughness of the roll, increasing the amount of lubricant and / or increasing the rolling speed, is improved when the value ξ for the relative position of the neutral point is above an upper threshold value of about 0.4.
8. Verfahren nach einem der Ansprüche, dadurch gekennzeichnet, dass die Stabilisierung des Walzprozesses nach Maßgabe der berechneten Lage des neutralen Punktes automatisch oder aufgrund eines Eingriffes einer Bedienperson in den Walzprozess erfolgt. 8. The method according to any one of claims, characterized in that the stabilization of the rolling process takes place in accordance with the calculated position of the neutral point automatically or due to an intervention of an operator in the rolling process.
9. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die berechnete relative Lage (N) des neutralen Punktes vorzugsweise in ihrem Zeitablauf gespeichert und/oder für eine Bedienperson auf einer Anzeigeeinrichtung, vorzugsweise in Echtzeit, veranschaulicht wird.9. The method according to any one of the preceding claims, characterized in that the calculated relative position (N) of the neutral point is preferably stored in their time and / or for an operator on a display device, preferably in real time, is illustrated.
10. Computerprogramm für eine Steuereinrichtung zum Steuern eines Walzprozesses, dadurch gekennzeichnet, dass das Computerprogramm ausgebildet ist zum Durchführen des Verfahrens nach einem der vorangegangenen Ansprüche. 10. Computer program for a control device for controlling a rolling process, characterized in that the computer program is designed to carry out the method according to one of the preceding claims.
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