EP2026915A1 - Rolling stand for producing rolled strip or sheet - Google Patents

Rolling stand for producing rolled strip or sheet

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Publication number
EP2026915A1
EP2026915A1 EP07725994A EP07725994A EP2026915A1 EP 2026915 A1 EP2026915 A1 EP 2026915A1 EP 07725994 A EP07725994 A EP 07725994A EP 07725994 A EP07725994 A EP 07725994A EP 2026915 A1 EP2026915 A1 EP 2026915A1
Authority
EP
European Patent Office
Prior art keywords
contour
rolls
bale
function
corrected
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
EP07725994A
Other languages
German (de)
French (fr)
Other versions
EP2026915B2 (en
EP2026915B1 (en
Inventor
Alois Seilinger
Markus Widder
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.)
Primetals Technologies Austria GmbH
Original Assignee
Siemens VAI Metals Technologies GmbH and Co
Siemens VAI Metals Technologies GmbH Austria
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Siemens VAI Metals Technologies GmbH and Co, Siemens VAI Metals Technologies GmbH Austria filed Critical Siemens VAI Metals Technologies GmbH and Co
Priority to PL07725994T priority Critical patent/PL2026915T5/en
Priority to SI200730509T priority patent/SI2026915T2/en
Publication of EP2026915A1 publication Critical patent/EP2026915A1/en
Application granted granted Critical
Publication of EP2026915B1 publication Critical patent/EP2026915B1/en
Publication of EP2026915B2 publication Critical patent/EP2026915B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/028—Sixto, six-high stands
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B21B2027/022—Rolls having tapered ends
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips

Definitions

  • Roll stand for the production of rolled strip or sheet metal
  • the invention relates to a rolling stand for the production of rolled strip or sheet metal with work rolls, which are supported on support rolls or intermediate rolls and backup rolls, wherein at least one of these rollers has a running over the entire effective bale length, describable by a non-linear function bale contour and the bale contour of this at least one Roller has bevels in at least one of the edge regions of their longitudinal extent and forms a corrected bale contours in these edge regions.
  • a rolling stand of this type is already known, for example, from AT 410765 B.
  • the roll bale contour of these rollers known in the art under the name SmartCrown® is mathematically describable by a modified sine function. By a suitable choice of the contour parameters, this results in a cosinusoidal idling gap, which can be influenced in its amplitude by axial displacement of the rollers.
  • the rolls of rolling mills can also have many other bale contours, which are characterized, for example, by a cylindrical, bulbous, concave-convexly curved or another curved contour.
  • WO 02/09896 A1 and WO 2005/058517 A1 disclose a two-stage regrind of the bale contour on work rolls in a quarto scaffolding or on intermediate rolls on a sexto scaffold. Starting from the central bale contour in the direction of the bale end, a first regression using a circular arc function, wherein in the transition region of the central bale contour in the regrind contour exactly the same problems occur, as previously described with respect to the older prior art. The first regrind is followed by a second regrind, which extends to the end of the bale and realizes a cylindrical bale contour.
  • the object of the present invention is therefore to avoid the above-described disadvantages of the prior art and to propose a rolling stand in which inhomogeneities in the load distribution along the contact line of the support rollers and their Minimize adjacent rollers and in particular local load peaks in the load distribution curve, especially in the edge area, reduce and thus increase the service life of the rollers and the necessary regrinding intervals.
  • the corrected bale contour is obtained by subtracting any nonlinear mathematical chamfering function from the contour function described by the nonlinear function, wherein the slope of the bale contour and the slope of the corrected bale contour in the transition point of the Bale contour to the corrected bale contour are the same.
  • an exemption is achieved at the opposing bale contours of adjacent rollers along a defined chamfering length.
  • the back-up rolls in a quarto scaffold and the back-up rolls or the intermediate rolls in a sexto-scaffolding are equipped with a corrected bale contour.
  • FIG. 1 is a schematic representation of a four-high stand with contoured work rolls and cylindrical support rolls according to the prior art
  • FIG. 2 shows the typical load distribution between work rolls and support rolls in a four-high stand according to FIG. 1, FIG.
  • Fig. 3 is a schematic representation of a four-high stand with contoured work rolls and complementary support rollers. 4 shows the typical load distribution between work rolls and support rolls in a four-high stand with the roll formation according to FIG. 3, FIG.
  • FIG. 5 is a schematic representation of a six-high stand with contoured backup rolls and complementary intermediate rolls according to the invention
  • FIG. 6 is a schematic representation of a four-high stand with contoured work rolls and complementary back-up rolls according to the invention, in which the bale contours are no longer completely complementary
  • FIG. 7 shows the contour according to the invention of the upper support roller taking into account a circular chamfering function in comparison with bale contours according to the prior art
  • FIG. 10 shows the representation of a possible chamfering function according to the invention.
  • FIGS. 1 to 4 the load distribution between back-up rolls and work rolls in a roll bale contour according to the prior art is compared with the load distribution between back-up rolls and work rolls in a roll bale contour according to the invention using the example of a four-high stand.
  • FIG. 1 shows a schematic representation of the roll arrangement in a four-high stand for rolling a metal strip B, in particular a steel strip with work rolls 1 and back-up rolls 2.
  • the axially displaceable work rolls 1 each have a bale contour 3 which can be described by a concave-convex function.
  • the work rolls 1 are supported by support rollers 2, which have a cylindrical bale contour 4 and are supported on the work rolls acting rolling forces.
  • the load distribution between the upper work roll 1 and the upper support roll 2 is shown in this case of the roll bale design in Figure 2, wherein the specific force between the rolls is applied over the bale length and on the one hand Stress peaks in the edge region emerge and on the other hand maximum and minimum values corresponding to the convex-concave contour curve occur.
  • load distribution curves are illustrated which are already based on a chamfering function according to the prior art.
  • FIG. 3 shows a schematic representation of the roll arrangement in a four-high stand with work rolls 1 and back-up rolls 2.
  • the axially displaceable work rolls 1 in turn each have a describable by a non-linear function bale contour 3, said bale contours in a certain relative axial position of the work rolls complementarily complement.
  • the two support rollers 2 also have a complementary complementary bale contour 4, which is also formed by a non-linear function, with the bale contours of the adjacent, cooperating work roll 1 and support roller 2 completely complement each other in an unloaded state.
  • the load distribution between the upper work roll 1 and the upper support roll 2 is shown in FIG.
  • FIG. 5 shows, in a schematic arrangement, the roller arrangement in a six-high stand with work rolls 1, intermediate rolls 5 and support rolls 2, the work rolls being supported on the support rolls via the intermediate rolls.
  • the work rolls 1 are equipped with a cylindrical bale contour 3.
  • the bale contour of the work rolls can also be oriented to the bale contour of the adjacent intermediate rolls.
  • the intermediate rollers 5 have a bale contour 6 that can be described by a non-linear function.
  • the support rollers 2 have a bale contour 4 that can be described by a sine function.
  • the bale contours 4 of the support rollers 2 and the bale contour of the intermediate rollers 5 complement each other completely in the unshifted axial position of the axially adjustable intermediate rollers 5 in the unloaded state.
  • FIG. 6 shows work rolls 1 and support rolls 2 in a four-high stand in a schematic representation
  • the basic construction of the bale contours 3, 4 of FIGS Embodiment of Figure 3 follows. However, the contour is changed, whereby in the unloaded state only a partial or no supplement of the bale contours of the support roller 2 and the immediately adjacent work roll 1 occurs.
  • bale contours can also be chosen so that the contoured rolls have a positive or negative crown.
  • FIG. 7 shows the course of the roll bale contour 7 of a back-up roll or intermediate roll or work roll over the length of the bale.
  • dash-dotted lines 8, 9 known from the prior art possibilities of chamfering a roller in the end regions are shown to avoid high edge pressures.
  • the chamfering according to the dotted line 8 produces a cylindrical end portion and the chamfering corresponding to the dotted line 9 a cone-shaped end portion of the rollers, in both cases a kink 10 in the contour over the bale length occurs, which forms a circumferential edge on the roller.
  • An improvement in the loading conditions results from a chamfer gradually approaching the bale contour, whereby on both sides a corrected bale contour is formed, which is illustrated by the dotted lines 11 and 12.
  • both curves have the same slope as the tangent t.
  • FIG. 8 shows, for example, the spherical profile of the roller bale contour 7 described by a nonlinear function on a support roller in a quartz scaffolding or on an intermediate roller or a support roller in a sexto scaffolding.
  • the course of the corrected bale contour 11, 12 is illustrated by dotted lines.
  • FIG. 9 shows the analogous conditions in a roll bale contour which forms a negative roll crown on the roll.
  • FIG. 10 shows the course of the chamfering function 13 using the example of a circular function.
  • the amount AR to be subtracted can be expressed by the formula
  • a c represents the chamfer amplitude relative to the roller radius.

Abstract

A rolling mill stand for the production of rolled strip or sheet metal includes working rolls which are supported on respective supporting rolls or on intermediate rolls which are supported on supporting rolls. At least one of the rolls having a barrel contour which runs over the entire effective barrel length and can be described by a non-linear function. The barrel contour of this at least one roll having chamfers in at least one of the marginal regions of its longitudinal extent and the chamfers forming a corrected barrel contour in these marginal regions, so that inhomogeneities in the load distribution along the contact line of two adjacent rolls, and in particular in the region of the edges of the strip, are minimized. The corrected barrel contour is obtained by subtracting any non-linear mathematical chamfer function from the contour function described by the non-linear function, so that the pitch of the barrel contour and the pitch of the corrected barrel contour at a transition point from the barrel contour to the corrected barrel contour are identical.

Description

Walzgerüst zur Herstellung von Walzband oder BlechRoll stand for the production of rolled strip or sheet metal
Die Erfindung betrifft ein Walzgerüst zur Herstellung von Walzband oder Blech mit Arbeitswalzen, die sich an Stützwalzen oder Zwischenwalzen und Stützwalzen abstützen, wobei zumindest eine dieser Walzen eine über die gesamte wirksame Ballenlänge verlaufende, durch eine nichtlineare Funktion beschreibbare Ballenkontur aufweist und die Ballenkontur dieser zumindest einen Walze in mindestens einem der Randbereiche ihrer Längserstreckung Anfasungen aufweist und in diesen Randbereichen eine korrigierte Ballenkonturen bildet.The invention relates to a rolling stand for the production of rolled strip or sheet metal with work rolls, which are supported on support rolls or intermediate rolls and backup rolls, wherein at least one of these rollers has a running over the entire effective bale length, describable by a non-linear function bale contour and the bale contour of this at least one Roller has bevels in at least one of the edge regions of their longitudinal extent and forms a corrected bale contours in these edge regions.
Bei Quarto-Walzgerüsten oder Sexto-Walzgerüsten gehört es zur gängigen Praxis, zumindest die beiden Arbeitswalzen oder die beiden Zwischenwalzen, vereinzelt aber auch die Stützwalzen, mit einer speziellen Ballenkontur auszustatten und axial wirkende Verstelleinrichtungen für die Arbeitswalzen oder Stützwalzen vorzusehen, um die Walzspaltkontur in Abhängigkeit vom aktuellen Walzbandprofil einstellen zu können.In the case of four-high rolling stands or six-high rolling stands, it is common practice to equip at least the two work rolls or the two intermediate rolls, but also the backup rolls, with a special bale contour and provide axially acting adjusting devices for the work rolls or backup rolls, depending on the roll gap contour from the current rolled strip profile.
Ein Walzgerüst dieser Art ist beispielsweise aus der AT 410765 B bereits bekannt. Die Walzballenkontur dieser in der Fachwelt unter der Bezeichnung SmartCrown® bekannten Walzen ist mathematisch durch eine modifizierte Sinusfunktion beschreibbar. Durch geeignete Wahl der Konturparameter ergibt sich dabei ein kosinusförmiger Leerwalzspalt, der durch Axialverschiebung der Walzen in seiner Amplitude gezielt beeinflusst werden kann. Die Walzen von Walzgerüste können aber auch vielerlei andere Ballenkonturen aufweisen, die sich beispielsweise durch einen zylindrischen, bauchigen, konkav-konvex gekrümmt verlaufenden oder einen anderen gekrümmten Konturverlauf auszeichnen.A rolling stand of this type is already known, for example, from AT 410765 B. The roll bale contour of these rollers known in the art under the name SmartCrown® is mathematically describable by a modified sine function. By a suitable choice of the contour parameters, this results in a cosinusoidal idling gap, which can be influenced in its amplitude by axial displacement of the rollers. The rolls of rolling mills can also have many other bale contours, which are characterized, for example, by a cylindrical, bulbous, concave-convexly curved or another curved contour.
Bei Einsatz von Arbeitswalzen bzw. Zwischenwalzen mit der aus der AT 410 765 B bekannten Ballenkontur und zylindrisch geformten Stützwalzen in Quarto- oder Sexto- Walzgerüsten, wie im Normalfall üblich, ist es unvermeidbar, dass es im laufenden Walzbetrieb zu inhomogenen Lastverteilungen zwischen den Stützwalzen und den unmittelbar benachbarten Walzen kommt. Da der mit Hilfe der konturierten Walzen abzudeckende Balligkeitsbereich immer durch die Anforderungen des Walzprozesses bestimmt werden, wie beispielsweise durch unterschiedliche Prozessparameter, Dimensionen und verformungstechnische Eigenschaften des Walzgutes, ist der Verschiebehub der konturierten Walzen die einzige Einflussgröße, mit welcher sich die Ausgeprägtheit der Inhomogenität der Lastverteilung beeinflussen lässt. Derartige Maßnahmen sind geprägt von der Forderung an die Walzguthersteller, Bänder und Bleche in immer engeren Toleranzbereichen herzustellen.When using work rolls or intermediate rolls with the bale contour known from AT 410 765 B and cylindrically shaped support rolls in quartz or Sexto- rolling stands, as is usual in the normal case, it is unavoidable that in-current rolling operation to inhomogeneous load distributions between the back-up rolls and comes the immediately adjacent rolls. Since the crown area to be covered with the aid of the contoured rolls is always determined by the requirements of the rolling process, for example by different process parameters, Dimensions and deformation properties of the rolling stock, the displacement of the contoured rolls is the only influencing factor with which the expressiveness of the inhomogeneity of the load distribution can be influenced. Such measures are characterized by the demand on the rolling mill manufacturers to produce strips and sheets in increasingly narrow tolerance ranges.
Darüber hinaus kommt es speziell in den Randbereichen der Stützwalzen zu hohen Kantenpressungen im Zusammenwirken mit den benachbarten weiteren Walzen. Um unzulässig hohe Kantenpressungen zwischen Arbeitswalzen und Stützwalzen oder zwischen Arbeitswalzen und Zwischenwalzen bzw. Zwischenwalzen und Stützwalzen zu vermeiden, sind Ballenenden der Walzen üblicherweise angefast und weisen in diesen Randbereichen somit eine Freistellung auf. Freistellungen dieser Art sind aus der EP 0 258 482 A1 oder der EP 1 228 818 A2 bereits bekannt. Diese Freistellungen sind bei konturierten Walzenballen in Randbereichen mit zum Rand hin zunehmenden Ballenradius durch ein zylindrisches Ballenende ausgebildet, wie dies in der EP 0 258 482 A1 dargestellt ist oder kann bei Walzen mit zylindrischer Walzenballenkontur durch einen konusförmigen Randbereich ausgebildet sein, wie dies beispielsweise in der EP 1 228 818 A2 dargestellt und beschrieben ist. Jedenfalls kommt es bei diesen bekannten Freistellungen lediglich zu einer Verlagerung der kritischen Pressung von den Ballenenden (Kanten) zum Übergangsbereich zwischen der verbliebenen Ballenkontur und der Kontur der Anfasung, da bei dieser Ausgestaltung der Anfasung wiederum einen Knick im Konturverlauf des Walzenballens auftritt.In addition, especially in the edge regions of the support rollers, high edge pressures occur in cooperation with the adjacent further rollers. To avoid inadmissibly high edge pressures between work rolls and back-up rolls or between work rolls and intermediate rolls or intermediate rolls and back-up rolls, bale ends of the rolls are usually chamfered and thus have an exemption in these edge regions. Exemptions of this type are already known from EP 0 258 482 A1 or EP 1 228 818 A2. These exemptions are formed in contoured roll bales in marginal areas with increasing towards the edge bale radius by a cylindrical bale end, as shown in EP 0 258 482 A1 or may be formed in rolls with cylindrical roll bale contour by a cone-shaped edge region, as for example in the EP 1 228 818 A2 is shown and described. In any case, these known exemptions only result in a shift of the critical pressure from the bale ends (edges) to the transitional area between the remaining bale contour and the contour of the chamfer, since in this embodiment the chamfering again occurs in the contour of the roll bale.
Aus der WO 02/09896 A1 und der WO 2005/058517 A1 ist beispielsweise ein zweistufiger Rückschliff der Ballenkontur an Arbeitswalzen in einem Quartogerüst bzw. an Zwischenwalzen an einem Sextogerüst bekannt. Ausgehend von der zentralen Ballenkontur erfolgt in Richtung zum Ballenende ein erster Rückschliff unter Anwendung einer Kreisbogenfunktion, wobei im Übergangsbereich der zentralen Ballenkontur in die Rückschliffkontur genau dieselben Probleme auftreten, wie zuvor bezüglich des älteren Standes der Technik ausgeführt. An den ersten Rückschliff schließt ein zweiter Rückschliff an, der sich bis zum Ballenende der Walze erstreckt und der eine zylindrische Ballenkontur verwirklicht.WO 02/09896 A1 and WO 2005/058517 A1, for example, disclose a two-stage regrind of the bale contour on work rolls in a quarto scaffolding or on intermediate rolls on a sexto scaffold. Starting from the central bale contour in the direction of the bale end, a first regression using a circular arc function, wherein in the transition region of the central bale contour in the regrind contour exactly the same problems occur, as previously described with respect to the older prior art. The first regrind is followed by a second regrind, which extends to the end of the bale and realizes a cylindrical bale contour.
Aufgabe der vorliegenden Erfindung ist es daher, die zuvor beschriebenen Nachteile des Standes der Technik zu vermeiden und ein Walzgerüst vorzuschlagen, bei dem Inhomogenitäten in der Lastverteilung entlang der Kontaktlinie der Stützwalzen und ihrer Nachbarwalzen zu minimieren und insbesondere örtliche Belastungsspitzen im Lastverteilungsverlauf, speziell im Kantenbereich, abzubauen und damit die Einsatzdauer der Walzen und die notwendigen Nachschleifintervalle zu vergrößern.The object of the present invention is therefore to avoid the above-described disadvantages of the prior art and to propose a rolling stand in which inhomogeneities in the load distribution along the contact line of the support rollers and their Minimize adjacent rollers and in particular local load peaks in the load distribution curve, especially in the edge area, reduce and thus increase the service life of the rollers and the necessary regrinding intervals.
Diese Aufgabe wird bei einem Walzgerüst der eingangs beschriebenen Art dadurch gelöst, dass die korrigierte Ballenkontur sich durch Subtraktion einer beliebigen nichtlinearen mathematischen Anfasungsfunktion von der durch die nichtlineare Funktion beschriebene Konturfunktion ergibt, wobei die Steigung der Ballenkontur und die Steigung der korrigierten Ballenkontur im Übergangspunkt von der Ballenkontur zur korrigierten Ballenkontur gleich sind. Dadurch wird eine Freistellung an den einander gegenüberliegenden Ballenkonturen benachbarter Walzen entlang einer definierten Anfasungslänge erreicht.This object is achieved in a rolling stand of the type described above in that the corrected bale contour is obtained by subtracting any nonlinear mathematical chamfering function from the contour function described by the nonlinear function, wherein the slope of the bale contour and the slope of the corrected bale contour in the transition point of the Bale contour to the corrected bale contour are the same. As a result, an exemption is achieved at the opposing bale contours of adjacent rollers along a defined chamfering length.
Sehr gute Ergebnisse hinsichtlich einer Minimierung und Vergleichmäßigung der Lastverteilung werden erzielt, wenn die Anfasungsfunktion von einer Kreisfunktion gebildet ist. Von grundsätzlicher Bedeutung ist hierbei, dass die Steigung der Ballenkontur und die Steigung der korrigierten Ballenkontur im Übergangspunkt von der Ballenkontur zur korrigierten Ballenkontur gleich sind. Ähnlich gute Ergebnisse werden auch erzielt, wenn die Anfasungsfunktion von einer Sinusfunktion oder einer Funktion 2. Ordnung, beispielsweise einer parabolischen Funktion gebildet ist.Very good results in terms of minimization and equalization of the load distribution are achieved when the chamfering function is formed by a circular function. Of fundamental importance here is that the slope of the bale contour and the slope of the corrected bale contour in the transition point from the bale contour to the corrected bale contour are the same. Similarly good results are achieved if the chamfering function is formed by a sine function or a second-order function, for example a parabolic function.
Zweckmäßig sind die Stützwalzen in einem Quartogerüst und die Stützwalzen oder die Zwischenwalzen in einem Sextogerüst mit einer korrigierten Ballenkontur ausgestattet.Suitably, the back-up rolls in a quarto scaffold and the back-up rolls or the intermediate rolls in a sexto-scaffolding are equipped with a corrected bale contour.
Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beiliegenden Figuren Bezug genommen wird, die Folgendes zeigen:Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the attached figures, which show:
Fig. 1 die schematische Darstellung eines Quarto-Gerüstes mit konturierten Arbeitswalzen und zylindrischen Stützwalzen gemäß dem Stand der Technik,1 is a schematic representation of a four-high stand with contoured work rolls and cylindrical support rolls according to the prior art,
Fig. 2 die typische Lastverteilung zwischen Arbeitswalzen und Stützwalzen in einem Quarto-Gerüst gemäß Figur 1 ,2 shows the typical load distribution between work rolls and support rolls in a four-high stand according to FIG. 1, FIG.
Fig. 3 die schematische Darstellung eines Quarto-Gerüstes mit konturierten Arbeitswalzen und komplementären Stützwalzen. Fig. 4 die typische Lastverteilung zwischen Arbeitswalzen und Stützwalzen in einem Quarto-Gerüst mit der Walzenausbildung gemäß Figur 3,Fig. 3 is a schematic representation of a four-high stand with contoured work rolls and complementary support rollers. 4 shows the typical load distribution between work rolls and support rolls in a four-high stand with the roll formation according to FIG. 3, FIG.
Fig. 5 die schematische Darstellung eines Sexto-Gerüstes mit konturierten Stützwalzen und komplementären Zwischenwalzen gemäß der Erfindung,5 is a schematic representation of a six-high stand with contoured backup rolls and complementary intermediate rolls according to the invention,
Fig. 6 die schematische Darstellung eines Quarto-Gerüstes mit konturierten Arbeitswalzen und komplementären Stützwalzen gemäß der Erfindung , bei der sich die Ballenkonturen nicht mehr vollständig ergänzen,6 is a schematic representation of a four-high stand with contoured work rolls and complementary back-up rolls according to the invention, in which the bale contours are no longer completely complementary,
Fig. 7 die erfindungsgemäße Kontur der oberen Stützwalze unter Berücksichtigung einer kreisförmigen Anfasungsfunktion im Vergleich mit Ballenkonturen gemäß dem Stand der Technik,7 shows the contour according to the invention of the upper support roller taking into account a circular chamfering function in comparison with bale contours according to the prior art,
Fig. 8 eine konturierte Walze mit positiver Walzenballigkeit und einer erfindungsgemäßen Anfasung,8 shows a contoured roll with positive roll crowning and a chamfer according to the invention,
Fig. 9 eine konturierte Walze mit negativer Walzenballigkeit und einer erfindungsgemäßen Anfasung,9 shows a contoured roll with negative roll crown and a chamfer according to the invention,
Fig. 10 die Darstellung einer möglichen erfindungsgemäßen Anfasungsfunktion.10 shows the representation of a possible chamfering function according to the invention.
In den Figuren 1 bis 4 wird die Lastverteilung zwischen Stützwalzen und Arbeitswalzen bei einer Walzenballenkontur gemäß dem Stand der Technik der Lastverteilung zwischen Stützwalzen und Arbeitswalzen bei einer Walzenballenkontur gemäß der Erfindung am Beispiel eines Quarto-Gerüstes gegenübergestellt.In FIGS. 1 to 4, the load distribution between back-up rolls and work rolls in a roll bale contour according to the prior art is compared with the load distribution between back-up rolls and work rolls in a roll bale contour according to the invention using the example of a four-high stand.
Figur 1 zeigt in einer schematischen Darstellung die Walzenanordnung in einem Quarto- Gerüst zum Walzen eines Metallbandes B, insbesondere eines Stahlbandes mit Arbeitswalzen 1 und Stützwalzen 2. Die axial verschiebbaren Arbeitswalzen 1 weisen jeweils eine durch eine konkav-konvex verlaufende Funktion beschreibbare Ballenkontur 3 auf. Die Arbeitswalzen 1 werden von Stützwalzen 2 gestützt, die eine zylindrische Ballenkontur 4 aufweisen und auf die Arbeitswalzen einwirkende Walzkräfte abstützen. Die Lastverteilung zwischen der oberen Arbeitswalze 1 und der oberen Stützwalze 2 ist für diesen Fall der Walzenballengestaltung in Figur 2 dargestellt, wobei die spezifische Kraft zwischen den Walzen über die Ballenlänge aufgetragen ist und einerseits Belastungsspitzen im Kantenbereich hervortreten und andererseits Maximal- und Minimalwerte entsprechend dem konvex-konkaven Konturverlauf auftreten. Für vier ausgewählte Werte der maximalen relativen Axialverschiebung (Verschiebehub) der Arbeitswalzen zueinander sind Lastverteilungskurven dargestellt, denen bereits eine Anfasungsfunktion gemäß dem Stand der Technik zugrunde gelegt ist.1 shows a schematic representation of the roll arrangement in a four-high stand for rolling a metal strip B, in particular a steel strip with work rolls 1 and back-up rolls 2. The axially displaceable work rolls 1 each have a bale contour 3 which can be described by a concave-convex function. The work rolls 1 are supported by support rollers 2, which have a cylindrical bale contour 4 and are supported on the work rolls acting rolling forces. The load distribution between the upper work roll 1 and the upper support roll 2 is shown in this case of the roll bale design in Figure 2, wherein the specific force between the rolls is applied over the bale length and on the one hand Stress peaks in the edge region emerge and on the other hand maximum and minimum values corresponding to the convex-concave contour curve occur. For four selected values of the maximum relative axial displacement (displacement stroke) of the work rolls relative to one another, load distribution curves are illustrated which are already based on a chamfering function according to the prior art.
Figur 3 zeigt in einer schematischen Darstellung die Walzenanordnung in einem Quarto- Gerüst mit Arbeitswalzen 1 und Stützwalzen 2. Die axial verschiebbaren Arbeitswalzen 1 weisen wiederum jeweils eine durch eine nichtlineare Funktion beschreibbare Ballenkontur 3 auf, wobei sich diese Ballenkonturen in einer bestimmten relativen Axialstellung der Arbeitswalzen komplementär ergänzen. Die beiden Stützwalzen 2 weisen ebenfalls eine sich ergänzende komplementäre Ballenkontur 4 auf, die ebenfalls von einer nicht linearen Funktion gebildet ist, wobei sich die Ballenkonturen der benachbarten, zusammenwirkenden Arbeitswalze 1 und Stützwalze 2 in einem unbelasteten Zustand vollständig ergänzen. Die Lastverteilung zwischen der oberen Arbeitswalze 1 und der oberen Stützwalze 2 ist für diesen Fall der Walzenballengestaltung in Figur 4 dargestellt, wobei der dargestellten Lastverteilung bereits eine erfindungsgemäße korrigierte Ballenkontur im Kantenbereich zugrunde gelegt ist. Belastungsspitzen im Kantenbereich treten in Abhängigkeit von der Axialverschiebung unterschiedlich stark hervor. Insgesamt zeigt sich über den Walzballenverlauf bei der erfindungsgemäßen Ausführung jedoch eine grundlegende Vergleichmäßigung der Lastverteilung.Figure 3 shows a schematic representation of the roll arrangement in a four-high stand with work rolls 1 and back-up rolls 2. The axially displaceable work rolls 1 in turn each have a describable by a non-linear function bale contour 3, said bale contours in a certain relative axial position of the work rolls complementarily complement. The two support rollers 2 also have a complementary complementary bale contour 4, which is also formed by a non-linear function, with the bale contours of the adjacent, cooperating work roll 1 and support roller 2 completely complement each other in an unloaded state. The load distribution between the upper work roll 1 and the upper support roll 2 is shown in FIG. 4 for this case of the roll bale design, wherein the illustrated load distribution is already based on a corrected bale contour according to the invention in the edge region. Load peaks in the edge area appear differently depending on the axial displacement. Overall, however, a fundamental equalization of the load distribution via the roll bale course in the embodiment according to the invention is shown.
Figur 5 zeigt in einer schematischen Anordnung die Walzenanordnung in einem Sexto- Gerüst mit Arbeitswalzen 1 , Zwischenwalzen 5 und Stützwalzen 2, wobei die Arbeitswalzen über die Zwischenwalzen an den Stützwalzen abgestützt sind. Die Arbeitswalzen 1 sind mit einer zylindrischen Ballenkontur 3 ausgestattet. Nach einer weiteren möglichen Ausgestaltung kann sich die Ballenkontur der Arbeitswalzen jedoch auch an der Ballenkontur der benachbarten Zwischenwalzen orientieren. Die Zwischenwalzen 5 weisen eine durch eine nichtlineare Funktion beschreibbare Ballenkontur 6 auf. Gleichermaßen weisen die Stützwalzen 2 eine durch eine Sinusfunktion beschreibbare Ballenkontur 4 auf. Die Ballenkonturen 4 der Stützwalzen 2 und die Ballenkontur der Zwischenwalzen 5 ergänzen sich in der unverschobenen Axialstellung der axial verstellbaren Zwischenwalzen 5 im unbelasteten Zustand vollständig.FIG. 5 shows, in a schematic arrangement, the roller arrangement in a six-high stand with work rolls 1, intermediate rolls 5 and support rolls 2, the work rolls being supported on the support rolls via the intermediate rolls. The work rolls 1 are equipped with a cylindrical bale contour 3. According to another possible embodiment, however, the bale contour of the work rolls can also be oriented to the bale contour of the adjacent intermediate rolls. The intermediate rollers 5 have a bale contour 6 that can be described by a non-linear function. Likewise, the support rollers 2 have a bale contour 4 that can be described by a sine function. The bale contours 4 of the support rollers 2 and the bale contour of the intermediate rollers 5 complement each other completely in the unshifted axial position of the axially adjustable intermediate rollers 5 in the unloaded state.
Figur 6 zeigt Arbeitswalzen 1 und Stützwalzen 2 in einem Quarto-Gerüst in einer schematischen Darstellung, wobei der grundsätzliche Aufbau der Ballenkonturen 3, 4 der Ausführungsform nach Figur 3 folgt. Allerdings ist der Konturverlauf verändert, wodurch im unbelasteten Zustand nur mehr eine teilweise oder keine Ergänzung der Ballenkonturen der Stützwalze 2 und der unmittelbar benachbarten Arbeitswalze 1 auftritt.FIG. 6 shows work rolls 1 and support rolls 2 in a four-high stand in a schematic representation, the basic construction of the bale contours 3, 4 of FIGS Embodiment of Figure 3 follows. However, the contour is changed, whereby in the unloaded state only a partial or no supplement of the bale contours of the support roller 2 and the immediately adjacent work roll 1 occurs.
Im Fall, dass keine Ergänzung der Ballenkonturen vorgesehen ist, können die Ballenkonturen auch so gewählt werden, dass die die konturierten Walzen eine positive oder negative Balligkeit aufweisen.In the event that no complement of the bale contours is provided, the bale contours can also be chosen so that the contoured rolls have a positive or negative crown.
Nach einer nicht dargestellten Ausführungsform ist es gleichermaßen bei einem Sexto- Gerüst analog der Figur 5 möglich, den Konturverlauf der Stützwalzen und der Zwischenwalzen so zu wählen, dass im unbelasteten Zustand nur mehr eine teilweise Ergänzung der Ballenkonturen der Stützwalze und der unmittelbar benachbarten Zwischenwalze in einem unbelasteten Zustand auftritt.According to an embodiment, not shown, it is equally possible in a sexto scaffold analogous to Figure 5, to choose the contour of the support rollers and the intermediate rollers so that in the unloaded state only a partial complement of the bale contours of the support roller and the immediately adjacent intermediate roller in one unloaded condition occurs.
Insgesamt können auch bei den in den Figuren 5 und 6 dargestellten und dazu ergänzend beschriebenen Ballenkonturen erfindungsgemäße Anfasungsfuntionen zur Herstellung von korrigierten Ballenkonturen angewendet werden.Overall, it is also possible to apply chamfering devices according to the invention for the production of corrected bale contours in the bale contours illustrated in FIGS. 5 and 6 and additionally described.
In Figur 7 ist der Verlauf der Walzenballenkontur 7 einer Stützwalze oder Zwischenwalze oder Arbeitswalze über die Ballenlänge dargestellt. Mit strichpunktierten Linien 8, 9 sind aus dem Stand der Technik bekannte Möglichkeiten der Anfasung einer Walze in deren Endbereichen dargestellt, um hohe Kantenpressungen zu vermeiden. Die Anfasung entsprechend der strichpunktierten Linie 8 erzeugt einen zylindrischen Endbereich und die Anfasung entsprechend der strichpunktierten Linie 9 einen konusförmigen Endbereich an den Walzen, wobei in beiden Fällen ein Knick 10 im Konturverlauf über die Ballenlänge auftritt, der eine umlaufende Kante auf der Walze bildet. Eine Verbesserung der Belastungsverhältnisse ergibt sich durch eine sich an die Ballenkontur allmählich annähernde Anfasung, wodurch beiderseits eine korrigierte Ballenkontur entsteht, die durch die punktierten Linien 11 und 12 veranschaulicht ist. Im Übergangspunkt P der Ballenkontur in die korrigierte Ballenkontur weisen beide Kurvenverläufe dieselbe Steigung wie die Tangente t auf.FIG. 7 shows the course of the roll bale contour 7 of a back-up roll or intermediate roll or work roll over the length of the bale. With dash-dotted lines 8, 9 known from the prior art possibilities of chamfering a roller in the end regions are shown to avoid high edge pressures. The chamfering according to the dotted line 8 produces a cylindrical end portion and the chamfering corresponding to the dotted line 9 a cone-shaped end portion of the rollers, in both cases a kink 10 in the contour over the bale length occurs, which forms a circumferential edge on the roller. An improvement in the loading conditions results from a chamfer gradually approaching the bale contour, whereby on both sides a corrected bale contour is formed, which is illustrated by the dotted lines 11 and 12. At the transition point P of the bale contour in the corrected bale contour both curves have the same slope as the tangent t.
Figur 8 zeigt beispielsweise den über die Ballenlänge dargestellten balligen Verlauf der von einer nichtlinearen Funktion beschriebenen Walzenballenkontur 7 an einer Stützwalze in einem Quartogerüst oder an einer Zwischenwalze oder einer Stützwalze in einem Sextogerüst. Mit den strichpunktierten Linien 13 ist der Verlauf der Anfasungsfunktion unabhängig vom Verlauf der Walzenballenkontur 7 dargestellt. Der Verlauf der korrigierten Ballenkontur 11 , 12 ist mit punktierten Linien veranschaulicht. Im Übergangspunkt P der Rollenkontur 7 in die korrigierte Ballenkontur 11 , 12 weisen beide Kurvenverläufe dieselbe Steigung auf.FIG. 8 shows, for example, the spherical profile of the roller bale contour 7 described by a nonlinear function on a support roller in a quartz scaffolding or on an intermediate roller or a support roller in a sexto scaffolding. With the dotted lines 13 is the course of the chamfering function regardless of the course of the roll bale contour 7 shown. The course of the corrected bale contour 11, 12 is illustrated by dotted lines. At the transition point P of the roller contour 7 in the corrected bale contour 11, 12 both curves have the same slope.
Figur 9 zeigt die analogen Verhältnisse bei einer Walzenballenkontur, die eine negative Walzenballigkeit an der Walze ausprägt.FIG. 9 shows the analogous conditions in a roll bale contour which forms a negative roll crown on the roll.
Figur 10 zeigt den Verlauf der Anfasungsfunktion 13 am Beispiel einer Kreisfunktion. An jedem Punkt x außerhalb der Anfasungsstartposition xs, d.h. im Intervall der Anfasungslänge Lc, kann im Falle einer kreisförmigen Anfasungsfunktion der zu subtrahierende Betrag AR mittels der FormelFIG. 10 shows the course of the chamfering function 13 using the example of a circular function. At any point x outside the chamfering start position x s , ie in the chamfer length L c interval, in the case of a circular chamfering function, the amount AR to be subtracted can be expressed by the formula
AR = Rc - ^Rc 2 - (x - xs )2 AR = R c - R c 2 - (x - x s ) 2
berechnet werden, wobei x die Koordinate in Walzenaxialrichtungwhere x is the coordinate in roll axial direction
Xs die AnfasungsstartpositionXs the chamfer start position
Lc die AnfasungslängeLc the chamfering length
Rc den FasenradiusRc the chamfer radius
Ac die Anfasungsamplitude bezogen auf den Walzenradius darstellt. A c represents the chamfer amplitude relative to the roller radius.

Claims

Patentansprüche: claims:
1. Walzgerüst zur Herstellung von Walzband oder Blech mit Arbeitswalzen, die sich an Stützwalzen oder Zwischenwalzen und Stützwalzen abstützen, wobei zumindest eine dieser Walzen eine über die gesamte wirksame Ballenlänge verlaufende, durch eine nichtlineare Funktion beschreibbare Ballenkontur aufweist und die Ballenkontur dieser zumindest einen Walze in mindestens einem der Randbereiche ihrer Längserstreckung Anfasungen aufweist und in diesen Randbereichen eine korrigierte Ballenkonturen bildet, dadurch gekennzeichnet, dass die korrigierte Ballenkontur sich durch Subtraktion einer beliebigen nichtlinearen mathematischen Anfasungsfunktion von der durch die nichtlineare Funktion beschriebene Konturfunktion ergibt, wobei die Steigung der Ballenkontur und die Steigung der korrigierten Ballenkontur im Übergangspunkt von der Ballenkontur zur korrigierten Ballenkontur gleich sind.1. rolling stand for the production of rolled strip or sheet metal with work rolls, which are supported on backup rolls or intermediate rolls and backup rolls, wherein at least one of these rollers has a running over the entire effective bale length, describable by a non-linear function bale contour and the bale contour of at least one roller in characterized in that the corrected bale contour results by subtracting any non-linear mathematical chamfering function from the contour function described by the non-linear function, the slope of the bale contour and the slope the corrected bale contour in the transition point from the bale contour to the corrected bale contour are the same.
2. Walzgerüst nach Anspruch 1 , dadurch gekennzeichnet, dass die Anfasungsfunktion eine Kreisfunktion ist.2. rolling stand according to claim 1, characterized in that the chamfering function is a circular function.
3. Walzgerüst nach Anspruch 1 , dadurch gekennzeichnet, dass die Anfasungsfunktion eine Sinusfunktion ist.3. Roll stand according to claim 1, characterized in that the chamfering function is a sine function.
4. Walzgerüst nach Anspruch 1 , dadurch gekennzeichnet, dass die4. Roll stand according to claim 1, characterized in that the
Anfasungsfunktion eine Funktion 2. Ordnung ist.Chamfer function is a 2nd order function.
5. Walzgerüst nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stützwalzen in einem Quartogerüst und die Stützwalzen und/oder Zwischenwalzen in einem Sextogerüst mit einer korrigierten Ballenkontur ausgestattet sind. 5. Roll stand according to one of the preceding claims, characterized in that the support rollers are equipped in a quarto scaffolding and the support rollers and / or intermediate rollers in a Sextogerüst with a corrected bale contour.
EP07725994.3A 2006-06-14 2007-06-13 Rolling stand for producing rolled strip or sheet Active EP2026915B2 (en)

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PL2026916T3 (en) 2012-12-31
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US20100031724A1 (en) 2010-02-11
US8413476B2 (en) 2013-04-09
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PL2026915T3 (en) 2011-04-29
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ES2355948T5 (en) 2018-02-14
BRPI0713147A2 (en) 2012-03-20
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ES2355948T3 (en) 2011-04-01
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PL2026915T5 (en) 2018-08-31
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RU2442669C2 (en) 2012-02-20
UA92946C2 (en) 2010-12-27
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SI2026915T1 (en) 2011-03-31
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CN101511498A (en) 2009-08-19
RU2009100920A (en) 2010-07-20
SI2026916T1 (en) 2012-11-30
RU2009100918A (en) 2010-07-20

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