EP0152810A1 - Method for rolling foils from aluminium - Google Patents

Method for rolling foils from aluminium Download PDF

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Publication number
EP0152810A1
EP0152810A1 EP85100813A EP85100813A EP0152810A1 EP 0152810 A1 EP0152810 A1 EP 0152810A1 EP 85100813 A EP85100813 A EP 85100813A EP 85100813 A EP85100813 A EP 85100813A EP 0152810 A1 EP0152810 A1 EP 0152810A1
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EP
European Patent Office
Prior art keywords
width
line force
web
rolling
thickness
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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
EP85100813A
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German (de)
French (fr)
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EP0152810B1 (en
Inventor
Heinz Güttinger
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Sulzer Escher Wyss AG
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Sulzer Escher Wyss AG
Escher Wyss AG
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Priority to AT85100813T priority Critical patent/ATE36818T1/en
Publication of EP0152810A1 publication Critical patent/EP0152810A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B1/40—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 foils which present special problems, e.g. because of thinness
    • 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
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/36—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by radial displacement of the roll sleeve on a stationary roll beam by means of hydraulic supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys

Definitions

  • the invention relates to a method for rolling metal foils, in which a metal web of a certain width is passed between two work rollers pressed against one another with a certain line force at a certain web speed, the thickness of which is reduced from an initial value to an end value, and a device to carry out the procedure.
  • the invention relates to the rolling of the thinnest aluminum foils down to thicknesses of the order of 10 ⁇ m, whereby aluminum is also understood to mean alloyed aluminum.
  • aluminum is also understood to mean alloyed aluminum.
  • it is difficult to achieve uniformity in the thickness and flatness of the rolled aluminum over the entire width of the aluminum web.
  • an exact adherence to the size of the roll gap is necessary, down to fractions of a pm. In practice, however, this is very difficult to achieve because the rollers bend and flatten during operation due to the pressing forces.
  • cambered rolls roll bending and differentiated cooling, the unevenness can be reduced with a certain pressing force, but it cannot be completely eliminated.
  • the web speed is therefore fixed from the start and cannot be varied at will. It is therefore not possible with these previously known rolling methods or devices to increase the web speed of the web and to set it to an optimal value. Even a variation in the mean tensile stress does not result in an improvement, since the tensile stress is set to a most favorable value by the other parameters. If the tensile stress is too high, there is a risk of the web tearing off, and if the mean tensile stress is too low, the rolled film will ripple.
  • the invention sets itself the task of avoiding the disadvantages mentioned above in the methods and devices for rolling metal foils specified above, and in particular of improving the uniformity of the rolled metal foils over the web width, the web speed of the metal web being greater can be than in previously known methods.
  • this object is achieved in that the web speed of the metal web and the average line force of the work rolls are selected in this way that the line force is below the range in which the thickness reduction is independent of the line force at a given web speed, and that the line force varies over the width of the work rolls and is adjusted so that the thickness reduction and the tension distribution are over the width of the web has a predetermined profile, for example a constant value.
  • the invention deliberately deviates from previously known methods in which the saturation range of the line force deformation characteristic was worked, in which a certain increase and decrease in the mean line force results in almost no change in the thickness reduction.
  • the variations of the line force to be expected due to the unavoidable fluctuations across the width are absorbed by the additionally provided possibility of variation and control of the line force across the width.
  • rollers suitable for this are described, for example, in US Pat. No. 3,802,044 or US Pat. No. 3,885,283.
  • the pressure elements of these deflection adjustment rollers can be controlled with particular advantage by sensors which are arranged distributed over the width of the rolled web and which determine characteristic data, for example the film thickness or the tensile stress at the corresponding measuring points, and regulate the contact pressure of the individual pressure elements by means of a corresponding control device.
  • the invention is explained on the basis of the force-deformation diagram shown in FIG. 1 in comparison to previously known methods.
  • Figure 2 shows an embodiment of a rolling device according to the invention.
  • FIG. 1 shows in diagram form the dependence of the deformation, or more precisely, the final thickness h of an aluminum foil of the initial thickness h o during rolling with a line force F for different web speeds v 1 and v 2 , the tensile stress being assumed to be constant for the sake of simplicity .
  • the working point P 1 was chosen with such a high linear force that it falls within this saturation range. This high line force was required so that the inevitable crowning of the work rolls can be compensated for by the deflection of the support rolls, which was only possible with a variable rolling force. If the contact pressure F 1 fluctuates by an amount ⁇ F, the final thickness at a value h 1 therefore remained almost constant, provided the work is in the saturation range. However, the web speed cannot be increased arbitrarily, for example not from the value v 1 to a higher optimal value v 2 , since it is determined by the line force F 1 and the thickness h 1 .
  • the invention intentionally works with a significantly lower contact force F 2 , that is to say at the operating point P 2 , in which a line force variation by the amount 4lF would result in a significant change in thickness ⁇ h, specifically in Deviation from the previous trend of technical development and from the view of the professional world.
  • Figure 2 shows a suitable rolling device together with a control device in a schematic representation.
  • the rolled aluminum web 1 is rolled between two work rolls 2 and 3, the two work rolls being pressed against one another by support rolls 7 and 8 and exerting a linear force on the aluminum web 1 in the roll gap 6.
  • One of the support rollers 7 is designed as a deflection adjustment roller and consists of a fixed support 11 and a roll shell 12 which can be rotated about the support 11 and which is supported on the support 11 by means of hydrostatic pressure elements 13 which are connected via lines 14 with a pressure medium controllable pressure are supplied. Due to the pressure of this pressure medium, the roller jacket 12 is pressed onto the work roll 2 in the pressing plane, so that the two work rolls 2 and 3 are pressed against one another with a certain contact pressure.
  • the deflection adjusting roller 7 and the hydrostatic pressure elements 13 can, for example, be designed according to US 3 802 044, but other known designs can also be used, for example those in which one or more pressure chambers or hydrodynamic pressure elements or electrically, pneumatically or mechanically controlled pressure elements are provided.
  • the other support roller 8 can be designed as a conventional metal roller, or also as a deflection adjustment roller analogous to the other support roller 7.
  • the work rollers 2 and 3 themselves can also be designed as deflection adjustment rollers.
  • a thickness measuring device 16 is provided on the rolled web, which controls a thickness regulator 27, which transmits an actuating signal to a pressure control device 28.
  • the pressure in the pressure lines 14 for the pressure medium supply to the hydrostatic pressure elements 13 ′ is controlled by this device, so that the mean line force reaches a predetermined desired value.
  • the thickness controller 27 can also control the web speed v.
  • a plurality of sensors 29 are provided over the width B 2 of the rolled web 1, for example thickness sensors or tension sensors of a known type.
  • These sensors 29 control a controller 30, which in turn influences the pressure regulating device 28 by means of which the pressures in the pressure lines 14 for the pressure medium supply to the pressure elements 13 are individually regulated so that the sensors 29 register a predetermined desired profile, for example a constant value over the entire width B 2 .
  • the pressure elements 13 distributed over the width B 1 can be controlled individually by the pressure control device 28 or grouped in groups, that is, to form groups of adjacent pressure elements, which simplifies the control effort in certain cases.
  • the control and regulating devices required for the regulation are known to the person skilled in the art; furthermore, devices (not shown) for generating a certain web speed v and tension d are provided for the film web 1.
  • a semi-automatic control can also be provided, in which an operator adjusts the contact pressure so that the measured values of the sensors assume predetermined values, or a manual control of the contact pressure according to the visual impression of the rolled Foil.
  • An aluminum foil rolling device with 1100 mm wide work rolls of 165 mm diameter and support rolls of 380 mm was installed in a test facility Diameter for rolling an alloyed aluminum foil from an initial thickness of 40 microns to a final thickness of 20 microns converted and operated according to the invention.
  • the rolling device was operated in a conventional manner with a contact force of 550 kN on each side, that is to say with a total contact force of 1100 kN, ie an average line force of 1000 N / mm and a web speed of 320 m / min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

In rolling metal foils, such as aluminum foils, especially very thin foils in the range down to 10 mu m, an improved uniformity of the foil thickness over the width of the foil sheet and, simultaneously, greater rolling speeds of the foil sheet are obtained by operating the rolling apparatus at a working point of the rolling force/material-working or line force/deformation characteristic curve which lies below the saturation region in which, while the material-working or deformation is nearly independent of the rolling or line force, the rolling or pulling speed is determined by other parameters and can not be varied. The thickness variations occurring under this selection of the working point and due to variations in the rolling or line force over the width of the rolls are compensated by regulating the rolling or line force such that the thickness reduction is constant over the width of the sheet or has a desired profile of variation. This can be obtained by, for instance, constructing one or more of the rolls as a controlled deflection roll provided with a series of pressure or support elements having regulatable pressing forces distributed over the width of the roll.

Description

Die Erfindung betrifft ein Verfahren zum Walzen von Metall-Folien, bei welchem eine Metall-Bahn bestimmter Breite zwischen zwei mit einer bestimmten Linienkraft gegeneinander gepressten Arbeitswalzen mit einer bestimmten Bahngeschwindigkeit hindurchgeführt und dabei deren Dicke von einem Anfangswert auf einen Endwert reduziert wird, sowie eine Vorrichtung zur Ausführung des.Verfahrens.The invention relates to a method for rolling metal foils, in which a metal web of a certain width is passed between two work rollers pressed against one another with a certain line force at a certain web speed, the thickness of which is reduced from an initial value to an end value, and a device to carry out the procedure.

Insbesondere bezieht sich die Erfindung auf das Walzen dünnster Aluminium-Folien bis herab zu Dicken in der Grössenordnung von 10 µm, wobei unter Aluminium auch legiertes Aluminium verstanden wird. Bei derartigen dünnsten Folien ist es jedoch schwierig, eine Gleichmässigkeit der Dicke und Planheit des gewalzten Aluminiums über die gesamte Breite der Aluminium- Bahn zu erreichen. Dazu ist eine genaue Einhaltung der Grösse des Walzspaltes erforderlich, bis herab zu Bruchteilen eines p'm. Dies ist jedoch in der Praxis nur sehr schwierig zu erreichen, da sich die Walzen durch die Presskräfte während des Betriebes durchbiegen und abflachen. Durch Verwendung bombierter Walzen, Walzenbiegung und differenzierte Kühlung'lässt sich die Ungleichmässigkeit bei einer bestimmten Presskraft zwar vermindern, jedoch nicht völlig ausschalten.In particular, the invention relates to the rolling of the thinnest aluminum foils down to thicknesses of the order of 10 μm, whereby aluminum is also understood to mean alloyed aluminum. With such thinnest foils, however, it is difficult to achieve uniformity in the thickness and flatness of the rolled aluminum over the entire width of the aluminum web. For this, an exact adherence to the size of the roll gap is necessary, down to fractions of a pm. In practice, however, this is very difficult to achieve because the rollers bend and flatten during operation due to the pressing forces. By using cambered rolls, roll bending and differentiated cooling, the unevenness can be reduced with a certain pressing force, but it cannot be completely eliminated.

Um in der Praxis trotzdem eine gute Gleichmässigkeit über die gesamte Bahnbreite zu erreichen, ist es bekannt, die Linienkraft so gross zu wählen, dass sie in den Bereich der Kraft-Verformungs-Charakteristik der Metallbahn fällt, wo die Verformung unabhängig von der Presskraft wird, d.h. dass bei einer kleinen Variation der Linienkraft die Verformung, d.h. die Enddicke des gewalzten Aluminiums wenigstens angenähert konstant bleibt. Gewisse Variationen der Linienkraft über die Bahnbreite führen daher nicht zu einer Ungleichmässigkeit der Dicke über die Breite, sondern ergeben eine einigermassen gleichmässige Dikke der gewalzten Aluminium-Folie. Dabei ist jedoch zu berücksichtigen, dass in diesem Bereich der Linienkraft der Grenzwert der Enddicke im wesentlichen von der Bahngeschwindigkeit und in geringerem Masse von der mittleren Zugspannung abhängig ist. Bei einem vorgegebenen Endwert der Dicke ist daher die Bahngeschwindigkeit von vornherein festgelegt und kann nicht beliebig variiert werden. Es ist daher bei diesen vorbekannten Walzverfahren bzw. Vorrichtungen nicht möglich, die Bahngeschwindigkeit der Bahn zu vergrössern und auf einen optimalen Wert einzustellen. Auch eine Variation der mittleren Zugspannung ergibt keine Verbesserung, da die Zugspannung durch die anderen Parameter auf einen günstigsten Wert festgelegt wird. Bei einer zu grossen Zugspannung besteht die Gefahr des Abreissens der Bahn, und bei einer zu geringen mittleren Zugspannung tritt eine Welligkeit der gewalzten Folie auf.In order to achieve good uniformity across the entire web width in practice, it is known to select the line force so large that it falls within the range of the force-deformation characteristic of the metal web, where the deformation becomes independent of the pressing force, ie that with a small one Variation of the line force the deformation, ie the final thickness of the rolled aluminum remains at least approximately constant. Certain variations in the line force across the web width therefore do not lead to an unevenness in the thickness across the width, but result in a reasonably uniform thickness of the rolled aluminum foil. However, it must be taken into account here that in this area of the line force the limit value of the final thickness essentially depends on the web speed and to a lesser extent on the mean tensile stress. For a given final value of the thickness, the web speed is therefore fixed from the start and cannot be varied at will. It is therefore not possible with these previously known rolling methods or devices to increase the web speed of the web and to set it to an optimal value. Even a variation in the mean tensile stress does not result in an improvement, since the tensile stress is set to a most favorable value by the other parameters. If the tensile stress is too high, there is a risk of the web tearing off, and if the mean tensile stress is too low, the rolled film will ripple.

Die Erfindung setzt sich die Aufgabe, bei den eingangs angegebenen Verfahren und Vorrichtungen zum Walzen von Metall-Folien die vorstehend erwähnten Nachteile zu vermeiden, und insbesondere die Gleichmässigkeit der gewalzten Metall-Folien über die Bahnbreite zu verbessern, wobei die Bahngeschwindigkeit der Metall-Bahn grösser sein kann als bei vorbekannten Verfahren.The invention sets itself the task of avoiding the disadvantages mentioned above in the methods and devices for rolling metal foils specified above, and in particular of improving the uniformity of the rolled metal foils over the web width, the web speed of the metal web being greater can be than in previously known methods.

Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass die Bahngeschwindigkeit der Metall-Bahn und die mittlere Linienkraft der Arbeitswalzen so gewählt werden, dass die Linienkraft unterhalb des Bereiches liegt, indem die Dicken-Reduktion bei gegebener Bahngeschwindigkeit unabhängig von der Linienkraft ist, und dass die Linienkraft über die Breite der Arbeitswalzen variiert und so eingestellt wird, dass die Dikken-Reduktion und die Zugspannungs-Verteilung über die Breite der Bahn ein vorgegebenes Profil, z.B. einen konstanten Wert besitzt.According to the invention, this object is achieved in that the web speed of the metal web and the average line force of the work rolls are selected in this way that the line force is below the range in which the thickness reduction is independent of the line force at a given web speed, and that the line force varies over the width of the work rolls and is adjusted so that the thickness reduction and the tension distribution are over the width of the web has a predetermined profile, for example a constant value.

Die Erfindung weicht dabei bewusst von vorbekannten Verfahren ab, bei denen im Sättigungsbereich der Linienkraft-Verformungs-Charakteristik gearbeitet wurde, in dem eine gewisse Erhöhung und Verminderung der mittleren Linienkraft fast keine Aenderung der Dicken-Reduktion ergibt. Die durch die unvermeidbaren Schwankungen über die Breite zu erwartenden Variationen der Linienkraft werden dabei durch die zusätzlich vorgesehene Variations- und Steuermöglichkeit der Linienkraft über die Breite aufgefangen.The invention deliberately deviates from previously known methods in which the saturation range of the line force deformation characteristic was worked, in which a certain increase and decrease in the mean line force results in almost no change in the thickness reduction. The variations of the line force to be expected due to the unavoidable fluctuations across the width are absorbed by the additionally provided possibility of variation and control of the line force across the width.

Besonders vorteilhaft ist es dazu, die Arbeitswalzen oder in einer bevorzugten Ausführung die die Arbeitswalzen gegeneinanderpressenden Stützwalzen als Durchbiegungseinstellwalzen auszubilden, die eine gesteuerte Variation der Anpresskraft über die Walzenbreite ermöglichen. Dafür geeignete Walzen sind beispielsweise in US 3 802 044 oder US 3 885 283 beschrieben. Die Druckelemente dieser Durchbieungseinstellwalzen können mit besonderem Vorteil durch Sensoren gesteuert werden, welche über die Breite der gewalzten Bahn verteilt angeordnet sind und charakteristische Daten, beispielsweise die Foliendicke oder die Zugspannung an den entsprechenden Messpunkten bestimmen und die Anpresskraft der einzelnen Druckelemente über eine entsprechende Regeleinrichtung regeln.It is particularly advantageous to design the work rolls or, in a preferred embodiment, the support rolls pressing the work rolls against one another as deflection-setting rolls, which enable a controlled variation of the contact pressure over the roll width. Rollers suitable for this are described, for example, in US Pat. No. 3,802,044 or US Pat. No. 3,885,283. The pressure elements of these deflection adjustment rollers can be controlled with particular advantage by sensors which are arranged distributed over the width of the rolled web and which determine characteristic data, for example the film thickness or the tensile stress at the corresponding measuring points, and regulate the contact pressure of the individual pressure elements by means of a corresponding control device.

Die Erfindung wird anhand des in Figur 1 wiedergegebenen Kraft-Verformungs-Diagrammes im Vergleich zu vorbekannten Verfahren erläutert.The invention is explained on the basis of the force-deformation diagram shown in FIG. 1 in comparison to previously known methods.

Figur 2 zeigt ein Ausführungsbeispiel einer erfindungsgemässen Walzvorrichtung.Figure 2 shows an embodiment of a rolling device according to the invention.

Figur 1 zeigt in Diagrammform die Abhängigkeit der Verformung, oder genauer gesagt, der Enddicke h einer Aluminium-Folie der Anfangsdicke ho beim Walzen mit einer Linienkraft F für verschiedene Bahngeschwindigkeiten v1 und v2, wobei die Zugspannung der Einfachheit halber als konstant angenommen wurde. Man erkennt, dass bei steigender Linienkraft F zunächst die Dicke nach dem Walzen vom Ausgangswert ho abnimmt. Nach weiterer Steigerung der Linienkraft kommt man jedoch in einen Bereich, wo die Charakteristik auf einen bestimmten Endwert einläuft, beispielsweise die Kurve v1 auf die Enddicke h1. Bei einer weiteren Steigerung der Linienkraft F würde keine weitere Dickenreduktion stattfinden.FIG. 1 shows in diagram form the dependence of the deformation, or more precisely, the final thickness h of an aluminum foil of the initial thickness h o during rolling with a line force F for different web speeds v 1 and v 2 , the tensile stress being assumed to be constant for the sake of simplicity . It can be seen that with increasing line force F, the thickness after rolling initially decreases from the initial value h o . After further increasing the line force, however, one arrives in an area where the characteristic converges to a certain final value, for example the curve v 1 to the final thickness h 1 . With a further increase in the line force F, no further reduction in thickness would take place.

Bei vorbekannten Verfahren zum Walzen von Aluminium-Folien wählte man nun den Arbeitspunkt P1 bei einer so hohen Linienkraft, dass er in diesen Sättigungsbereich fällt. Diese hohe Linienkraft war erforderlich, damit die unvermeidliche Balligkeit der Arbeitswalzen durch die Durchbiegung der Stützwalzen kompensiert werden kann, was nur mit einer variablen Walzkraft möglich war. Bei einer Schwankung der Anpresskraft F1 um einen Betrag Δ F blieb daher die Enddicke bei einem Wert h1 nahezu konstant, sofern im Sättigungsbereich gearbeitet wird. Die Bahngeschwindigkeit kann aber dabei nicht beliebig erhöht werden, z.B. nicht vom Wert v1 auf einen höheren optimalen Wert v2, da sie durch die Linienkraft F1 und die Dicke h1 festgelegt ist.In previously known processes for the rolling of aluminum foils, the working point P 1 was chosen with such a high linear force that it falls within this saturation range. This high line force was required so that the inevitable crowning of the work rolls can be compensated for by the deflection of the support rolls, which was only possible with a variable rolling force. If the contact pressure F 1 fluctuates by an amount Δ F, the final thickness at a value h 1 therefore remained almost constant, provided the work is in the saturation range. However, the web speed cannot be increased arbitrarily, for example not from the value v 1 to a higher optimal value v 2 , since it is determined by the line force F 1 and the thickness h 1 .

Um trotzdem eine höhere Bahngeschwindigkeit v2 erreichen zu können, wird erfindungsgemäss absichtlich mit einer deutlich niedrigeren Anpresskraft F2 gearbeitet, d.h. im Arbeitspunkt P2, in dem eine Linienkraft-Variation um den Betrag 4lF eine deutliche Dickenänderung Δh ergeben würde, und zwar bewusst in Abweichung vom bisherigen Trend der technischen Entwicklung und von der Auffassung der Fachwelt. Um jedoch die Dickenschwankungen über die Bahnbreite und mangelnde Planheit zu vermeiden, die sich bei einem Abwandern des örtlichen Arbeitspunktes über die Bahnbreite von P2 beispielsweise auf P3 notwendigerweise ergeben würden, werden erfindungsgemäss solche Variationen dadurch kompensiert, dass die Anpress- bzw. Linienkraft über die Breite der Walzen steuerbar gemacht wird, wobei die Steuerung so erfolgt, dass die Dicken- reduktion über die Breite der Bahn einem gewünschten und vorgegebenen Profil entspricht, beispielsweise über die gesamte Breite angenähert konstant bleibt. Im Punkt P2 wird die Enddicke also nicht nur durch die Bahngeschwindigkeit, sondern ausserdem durch die mittlere Linienkraft bestimmt.In order nevertheless to be able to achieve a higher web speed v 2 , the invention intentionally works with a significantly lower contact force F 2 , that is to say at the operating point P 2 , in which a line force variation by the amount 4lF would result in a significant change in thickness Δh, specifically in Deviation from the previous trend of technical development and from the view of the professional world. However, in order to avoid the fluctuations in thickness over the web width and lack of flatness, which would necessarily result if the local working point migrated from P 2 to P 3, for example, such variations are compensated according to the invention in that the contact pressure or line force exceeds the width of the rolls is made controllable, the control being carried out in such a way that the thickness reduction across the width of the web corresponds to a desired and predetermined profile, for example remains approximately constant over the entire width. At point P 2 , the final thickness is not only determined by the web speed, but also by the mean line force.

Figur 2 zeigt eine dazu geeignete Walzvorrichtung zusammen mit einer Regeleinrichtung in schematischer Darstellung. Hierbei wird die gewalzte Aluminium- Bahn 1 zwischen zwei Arbeitswalzen 2 und 3 gewalzt, wobei die beiden Arbeitswalzen durch Stützwalzen 7 und 8 gegeneinander gepresst werden und im Walzspalt 6 eine Linienkraft auf die Aluminium-Bahn 1 ausüben. Eine der Stützwalzen 7 ist als Durchbiegungseinstellwalze ausgebildet und besteht aus einem feststehenden Träger 11 und einem um den Träger 11 rotierbaren Walzenmantel 12, der auf dem Träger 11 mittels hydrostatischer Druckelemente 13 abgestützt ist, die über Leitungen 14 mit einem Druckmittel steuerbaren Drucks versorgt werden. Durch den Druck dieses Druckmittels wird der Walzenmantel 12 in der Pressebene auf die Arbeitswalze 2 gedrückt, so dass die beiden Arbeitswalzen 2 und 3 mit einer gewissen Anpresskraft gegeneinander gepresst werden.Figure 2 shows a suitable rolling device together with a control device in a schematic representation. Here, the rolled aluminum web 1 is rolled between two work rolls 2 and 3, the two work rolls being pressed against one another by support rolls 7 and 8 and exerting a linear force on the aluminum web 1 in the roll gap 6. One of the support rollers 7 is designed as a deflection adjustment roller and consists of a fixed support 11 and a roll shell 12 which can be rotated about the support 11 and which is supported on the support 11 by means of hydrostatic pressure elements 13 which are connected via lines 14 with a pressure medium controllable pressure are supplied. Due to the pressure of this pressure medium, the roller jacket 12 is pressed onto the work roll 2 in the pressing plane, so that the two work rolls 2 and 3 are pressed against one another with a certain contact pressure.

Die Durchbiegungseinstellwalze 7 und die hydrostatischen Druckelemente 13 können beispielsweise gemäss US 3 802 044 ausgeführt sein, jedoch sind auch andere bekannte Ausführungen verwendbar, beispielsweise solche, bei denen eine oder mehrere Druckkammern oder hydrodynamische Druckelemente oder elektrisch, pneumatisch oder mechanisch gesteuerte Druckelemente vorgesehen sind.The deflection adjusting roller 7 and the hydrostatic pressure elements 13 can, for example, be designed according to US 3 802 044, but other known designs can also be used, for example those in which one or more pressure chambers or hydrodynamic pressure elements or electrically, pneumatically or mechanically controlled pressure elements are provided.

Die andere Stützwalze 8 kann als konventionelle Metallwalze ausgeführt sein, oder ebenfalls als Durchbiegungseinstellwalze analog zur anderen Stützwalze 7. Statt der Stützwalzen können auch die Arbeitswalzen 2 und 3 selbst als Durchbiegungseinstellwalzen ausgeführt sein.The other support roller 8 can be designed as a conventional metal roller, or also as a deflection adjustment roller analogous to the other support roller 7. Instead of the support rollers, the work rollers 2 and 3 themselves can also be designed as deflection adjustment rollers.

Zur Einstellung der mittleren Linienkraft ist auf der gewalzten Bahn ein Dickenmessgerät 16 vorgesehen, das einen Dickenregler 27 ansteuert, der ein Stellsignal an eine Druckregeleinrichtung 28 weitergibt. Von dieser Einrichtung wird der Druck in den Druckleitungen 14 für die Druckmittelzufuhr zu den hydrostatischen Druckelementen 13'gesteuert, so dass die mittlere Linienkraft einen vorgegebenen Sollwert erreicht. Zusätzlich kann der Dickenregler 27 auch noch die Bahngeschwindigkeit v steuern. Zusätzlich sind über die Breite B2 der gewalzten Bahn 1 mehrere Sensoren 29 vorgesehen, beispielsweise Dickenfühler oder Zugspannungssensoren bekannter Art. Diese Sensoren 29 steuern einen Regler 30 an, welcher wiederum die Druckregeleinrichtung 28 beeinflusst, durch die die Drücke in den Druckleitungen 14 für die Druckmittelzufuhr zu den Druckelementen 13 individuell so geregelt werden, dass die Sensoren 29 ein vorgegebenes gewünschtes Profil, beispielsweise einen konstanten Wert über die gesamte Breite B2 registrieren. Die über die Breite B1 verteilten Druckelemente 13 können dabei individuell von der Druckregeleinrichtung 28 angesteuert werden oder gruppenweise, d.h. zu Gruppen benachbarter Druckelemente zusammengefasst, was den Regelungsaufwand in gewissen Fällen vereinfacht. Die für die Regelung-erforderlichen Steuer- und Regeleinrichtungen sind dem Fachmann bekannt, weiterhin sind im Bild nicht dargestellte Einrichtungen zur Erzeugung einer bestimmten Bahngeschwindigkeit v und Zugspannung d für die Folienbahn 1 vorgesehen.To set the mean line force, a thickness measuring device 16 is provided on the rolled web, which controls a thickness regulator 27, which transmits an actuating signal to a pressure control device 28. The pressure in the pressure lines 14 for the pressure medium supply to the hydrostatic pressure elements 13 ′ is controlled by this device, so that the mean line force reaches a predetermined desired value. In addition, the thickness controller 27 can also control the web speed v. In addition, a plurality of sensors 29 are provided over the width B 2 of the rolled web 1, for example thickness sensors or tension sensors of a known type. These sensors 29 control a controller 30, which in turn influences the pressure regulating device 28 by means of which the pressures in the pressure lines 14 for the pressure medium supply to the pressure elements 13 are individually regulated so that the sensors 29 register a predetermined desired profile, for example a constant value over the entire width B 2 . The pressure elements 13 distributed over the width B 1 can be controlled individually by the pressure control device 28 or grouped in groups, that is, to form groups of adjacent pressure elements, which simplifies the control effort in certain cases. The control and regulating devices required for the regulation are known to the person skilled in the art; furthermore, devices (not shown) for generating a certain web speed v and tension d are provided for the film web 1.

Es sei noch erwähnt, dass statt mehrerer Sensoren 29, die über die gesamte Breite B2 der Bahn verteilt und an bestimmten Messstellen fest angebracht sind, auch ein einziger Sensor vorgesehen sein kann, der über die Bahnbreite hin- und herläuft und dabei entsprechende Signale an die Regeleinrichtung 30 in Abhängigkeit von der jeweiligen Position abgibt.It should also be mentioned that instead of a plurality of sensors 29, which are distributed over the entire width B 2 of the web and are fixedly attached to certain measuring points, a single sensor can also be provided, which runs back and forth across the web width and thereby sends corresponding signals the control device 30 outputs depending on the respective position.

Anstelle einer vollständig automatischen Regelung der Anpresskraft der einzelnen Druckelemente kann auch eine halbautomatische Regelung vorgesehen sein, bei der eine Bedienungs-Person die Anpresskräfte nachstellt, so dass die Messwerte der Sensoren vorgegebene Werte annehmen, oder eine manuelle Steuerung der Anpresskräfte nach dem visuellen Eindruck der gewalzten Folie.Instead of a fully automatic control of the contact pressure of the individual pressure elements, a semi-automatic control can also be provided, in which an operator adjusts the contact pressure so that the measured values of the sensors assume predetermined values, or a manual control of the contact pressure according to the visual impression of the rolled Foil.

In einer Versuchs-Anlage wurde eine Aluminium-Folien-Walzvorrichtung mit 1100 mm breiten Arbeitswalzen von 165 mm Durchmesser und Stützwalzen von 380 mm Durchmesser zum Walzen einer legierten Aluminium-Folie von einer Ausgangs-Dicke von 40 µm auf eine Enddicke von 20 µm gemäss der Erfindung umgerüstet und betrieben. In konventioneller Weise war die Walzvorrichtung mit einer Anstellkraft von 550 kN an jeder Seite, also mit einer Gesamt-Anpresskraft von 1100 kN, d.h. einer mittleren Linienkraft von 1000 N/mm und einer Bahngeschwindigkeit von 320 m/min gefahren worden. Nach Ersatz der beiden Stützwalzen durch hydrostatische Durchbiegungseinstellwalzen des Fabrikates "Escher Wyss, Typ K" (obere Walze) und "Typ F" (untere Walze) mit "NIPCO"-Steuerung konnte eine qualitativ gleichartige Aluminium-Folie von 20 µm Dicke bei einer auf 550 N/mm herabgesetzten Linienkraft, jedoch auf 450 m/min erhöhten Bahngeschwindigkeit, also um ca. 40 % erhöhten Maschinenleistung versuchsweise hergestellt werden.An aluminum foil rolling device with 1100 mm wide work rolls of 165 mm diameter and support rolls of 380 mm was installed in a test facility Diameter for rolling an alloyed aluminum foil from an initial thickness of 40 microns to a final thickness of 20 microns converted and operated according to the invention. The rolling device was operated in a conventional manner with a contact force of 550 kN on each side, that is to say with a total contact force of 1100 kN, ie an average line force of 1000 N / mm and a web speed of 320 m / min. After replacing the two back-up rolls with hydrostatic deflection rolls made by "Escher Wyss, Type K" (upper roll) and "Type F" (lower roll) with "NIPCO" control, a similar quality aluminum foil with a thickness of 20 µm could be used 550 N / mm reduced line force, however, to 450 m / min increased web speed, that is to say by about 40% increased machine output.

Claims (9)

1. Verfahren zum Walzen von Aluminium-Folien, bei welchem eine Materialbahn (1) bestimmter Breite (B2) zwischen zwei mit einer bestimmten Linienkraft (F) gegeneinandergepressten Arbeitswalzen (2, 3) mit einer bestimmten Bahngeschwindigkeit (v) hindurchgeführt und dabei deren Dicke (h) von einem Anfangswert (ho) auf einen Endwert (h1) reduziert wird, dadurch gekennzeichnet, dass die Zuggeschwindigkeit (v) der Aluminiumbahn (1) und Linienkraft (F) der Arbeitswalzen (2, 3) so gewählt werden, dass die Linienkraft (F2) unterhalb desjenigen Bereiches (F1) liegt, in dem die Dicken-Reduktion (ho-'hj bei gegebener Bahngeschwindigkeit (v) unabhängig von der Linienkraft (F) ist, und dass die Linienkraft (F) über die Breite (B1) der Arbeitswalzen (2, 3) variiert und so eingestellt wird, dass die Dicken-Reduktion (ho - h1) über die Breite (B2) der Bahn ein vorgegebenes Profil besitzt.1. A method for rolling aluminum foils, in which a material web (1) of certain width (B 2 ) is passed between two work rollers (2, 3) pressed against one another with a certain line force (F) at a certain web speed (v) and thereby their Thickness (h) is reduced from an initial value (h o ) to an end value (h 1 ), characterized in that the tensile speed (v) of the aluminum web (1) and line force (F) of the work rolls (2, 3) are selected in this way that the line force (F 2 ) lies below the range (F 1 ) in which the thickness reduction (ho-'hj for a given web speed (v) is independent of the line force (F), and that the line force (F) Varies over the width (B 1 ) of the work rolls (2, 3) and is adjusted so that the thickness reduction (h o - h 1 ) over the width (B 2 ) of the web has a predetermined profile. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Linienkraft (F) über die Breite (B1) der Arbeitswalzen (2, 3) so eingestellt wird, dass die Dicken-Reduktion (ho - h1) über die Breite (B2) der Bahn wenigstens angenähert konstant ist.2. The method according to claim 1, characterized in that the line force (F) over the width (B 1 ) of the work rolls (2, 3) is set so that the thickness reduction (h o - h 1 ) over the width ( B 2 ) the path is at least approximately constant. 3. Verfahren nach Anspruch.1 oder 2, dadurch gekennzeichnet, dass die Variation der Einstellung der Linienkraft (F) über die Breite (B1) der Arbeitswalzen (2, 3) mittels einer als Durchbiegungseinstellwalze ausgebildeten, auf die Arbeitswalzen wirkenden Stützwalze (7) vorgenommen wird, welche über die Breite verteilte auf die Arbeitswalzen drückende, steuerbare Druckelemente (13) aufweist.3. The method according to claim 1 or 2, characterized in that the variation of the adjustment of the line force (F) across the width (B 1 ) of the work rolls (2, 3) by means of a support roll (7 ) which one Has controllable pressure elements (13) distributed over the width and pressing on the work rolls. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Steuerung der Druckelemente (13) in Abhängigkeit von über die Breite (B2) der Bahn (1) verteilt angeordnete Sensoren (29) erfolgt.4. The method according to claim 3, characterized in that the control of the printing elements (13) in dependence on the width (B 2 ) of the web (1) distributed sensors (29). 5. Vorrichtung zur Anwendung des Verfahrens zum Walzen von Aluminium-Folien nach einem der Ansprüche 1-4 mit zwei Arbeitswalzen (2, 3), zwischen denen eine Aluminium-Bahn (1) gewalzt wird und gegebenenfalls die Arbeitswalzen anpressenden Stützwalzen (7, 8), dadurch gekennzeichnet, dass wenigstens eine der Walzen (7) als Durchbiegungseinstellwalze mit über die Breite (B1) der Walze verteilten, steuerbaren Druckelementen (13) versehen ist.5. Apparatus for applying the method for rolling aluminum foils according to one of claims 1-4 with two work rolls (2, 3), between which an aluminum web (1) is rolled and optionally the support rolls pressing the work rolls (7, 8 ), characterized in that at least one of the rollers (7) is provided as a deflection adjusting roller with controllable pressure elements (13) distributed over the width (B 1 ) of the roller. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Durchbiegungseinstellwalze (7) eine Stützwalze ist, die einen feststehenden Träger (11) und einen um diese rotierbaren, mittels der Druckelemente (13) gegen den Träger (11) abgestützen und eine Linienkraft auf die Arbeitswalzen (2, 3) ausübenden Walzenmantel (12) aufweist.6. The device according to claim 5, characterized in that the deflection adjustment roller (7) is a support roller which supports a fixed support (11) and a rotatable around this, by means of the pressure elements (13) against the support (11) and a line force the work rolls (2, 3) have roll casing (12). 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Druckelemente (13) als hydrostatische, mit einem Druckmittel mit steuerbarem Druck versorg-1 ten Stützelemente ausgebildet sind.7. The device according to claim 6, characterized in that the pressure elements (13) are designed as hydrostatic support elements supplied with a pressure medium with controllable pressure. 8. Vorrichtung nach einem der Ansprüche 5 - 7, dadurch gekennzeichnet, dass eine Steuereinrichtung (28, 30) zur Steuerung der von den Druckelementen (13) auf 5 die Arbeitswalzen (2, 3) ausgeübten Linienkraft in Abhängigkeit von über die Breite (B2) der Bahn (1) verteilt angeordneten Sensoren (29) vorgesehen ist.8. Device according to one of claims 5-7, characterized in that a control device (28, 30) for controlling the line force exerted by the pressure elements (13) on 5 the work rolls (2, 3) in Dependence on sensors (29) arranged over the width (B 2 ) of the web (1) is provided. 9. Vorrichtung nach einem der Ansprüche 5 - 8, dadurch gekennzeichnet, dass auf der gewalzten Bahn (1) ein Dickenmessgerät (16) zur Messung der Enddicke und ein Dickenregler (27) zur Regelung der mittleren Linienkraft in Abhängigkeit von den Messwertendes Dickenmessgerätes (16) zur Regelung der Enddicke auf einen vorgegebenen Wert (h1) vorgesehen sind.9. Device according to one of claims 5-8, characterized in that on the rolled web (1) a thickness measuring device (16) for measuring the final thickness and a thickness controller (27) for regulating the mean line force as a function of the measured values of the thickness measuring device (16 ) are provided to regulate the final thickness to a predetermined value (h 1 ).
EP85100813A 1984-02-06 1985-01-26 Method for rolling foils from aluminium Expired EP0152810B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100813T ATE36818T1 (en) 1984-02-06 1985-01-26 PROCESS FOR ROLLING ALUMINUM FOIL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH532/84 1984-02-06
CH532/84A CH663555A5 (en) 1984-02-06 1984-02-06 METHOD AND DEVICE FOR ROLLING ALUMINUM FILMS.

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EP0152810A1 true EP0152810A1 (en) 1985-08-28
EP0152810B1 EP0152810B1 (en) 1988-08-31

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US (1) US4611479A (en)
EP (1) EP0152810B1 (en)
JP (1) JPS60187414A (en)
AT (1) ATE36818T1 (en)
CA (1) CA1237923A (en)
CH (1) CH663555A5 (en)
DE (1) DE3564660D1 (en)

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FR2607035A1 (en) * 1986-11-24 1988-05-27 Andritz Ag Maschf ROLLING MILL, ESPECIALLY COLD ROLLING MILL
DE3901804C1 (en) * 1989-01-23 1990-04-12 Eduard Kuesters, Maschinenfabrik, Gmbh & Co Kg, 4150 Krefeld, De Roll

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IT1182868B (en) * 1985-09-20 1987-10-05 Randolph Norwood Mitchell PROCEDURE AND EQUIPMENT FOR THE CONTINUOUS CONTROL AND / OR CORRECTION OF THE PROFILE AND FLATNESS OF METAL AND SIMILAR TAPES
AT390392B (en) * 1986-11-24 1990-04-25 Andritz Ag Maschf ROLLING MILL, IN PARTICULAR COLD ROLLING MILL
AT390574B (en) * 1986-11-24 1990-05-25 Andritz Ag Maschf ROLLING MILL, IN PARTICULAR COLD ROLLING MILL
FR2613641B1 (en) * 1987-04-09 1990-12-14 Clecim Sa PROCESS AND PLANT FOR ROLLING A BAND-FORMED PRODUCT, ESPECIALLY A METAL SHEET OR A STRIP
DE19511801A1 (en) * 1995-03-30 1996-10-02 Schloemann Siemag Ag Method and device for thickness control in film rolling
CA2214486C (en) * 1996-09-04 2006-06-06 Consolidated Papers, Inc. Method and apparatus for minimizing web-fluting in heat-set, web-offset printing presses
CN101791626A (en) * 2010-04-09 2010-08-04 安徽沪源铝业有限公司 Production method of high-toughness blocking aluminum foils
EP2724405B1 (en) * 2011-06-21 2015-05-13 Hydro Aluminium Rolled Products GmbH Chemically treated current collector foil produced of aluminum or an aluminum alloy
CN115116753B (en) * 2022-07-05 2023-11-28 新疆众和股份有限公司 Aluminum electrode foil and preparation method and application thereof

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DE1294317B (en) * 1962-12-24 1969-05-08 Siemag Siegener Masch Bau Rolling frame for belts, straights or the like with tight thickness tolerances
FR2360713A1 (en) * 1975-12-08 1978-03-03 Escher Wyss Sa METHOD AND DEVICE FOR ADJUSTING THE TIGHTENING FORCE OF A ROLLER
GB2018949A (en) * 1978-04-18 1979-10-24 Escher Wyss Ltd Rolling apparatus comprising at least one controlled-deflection roll
EP0091586A1 (en) * 1982-04-08 1983-10-19 Sulzer-Escher Wyss Ag A roll device

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DE1294317B (en) * 1962-12-24 1969-05-08 Siemag Siegener Masch Bau Rolling frame for belts, straights or the like with tight thickness tolerances
FR2360713A1 (en) * 1975-12-08 1978-03-03 Escher Wyss Sa METHOD AND DEVICE FOR ADJUSTING THE TIGHTENING FORCE OF A ROLLER
GB2018949A (en) * 1978-04-18 1979-10-24 Escher Wyss Ltd Rolling apparatus comprising at least one controlled-deflection roll
EP0091586A1 (en) * 1982-04-08 1983-10-19 Sulzer-Escher Wyss Ag A roll device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607035A1 (en) * 1986-11-24 1988-05-27 Andritz Ag Maschf ROLLING MILL, ESPECIALLY COLD ROLLING MILL
DE3901804C1 (en) * 1989-01-23 1990-04-12 Eduard Kuesters, Maschinenfabrik, Gmbh & Co Kg, 4150 Krefeld, De Roll

Also Published As

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EP0152810B1 (en) 1988-08-31
ATE36818T1 (en) 1988-09-15
DE3564660D1 (en) 1988-10-06
CH663555A5 (en) 1987-12-31
CA1237923A (en) 1988-06-14
US4611479A (en) 1986-09-16
JPS60187414A (en) 1985-09-24

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