EP1365869A1 - Roll stand for producing plane roll strips having a desired strip profile superelevation - Google Patents

Roll stand for producing plane roll strips having a desired strip profile superelevation

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Publication number
EP1365869A1
EP1365869A1 EP02702282A EP02702282A EP1365869A1 EP 1365869 A1 EP1365869 A1 EP 1365869A1 EP 02702282 A EP02702282 A EP 02702282A EP 02702282 A EP02702282 A EP 02702282A EP 1365869 A1 EP1365869 A1 EP 1365869A1
Authority
EP
European Patent Office
Prior art keywords
roll
work
rolls
work rolls
rolling mill
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
EP02702282A
Other languages
German (de)
French (fr)
Other versions
EP1365869B1 (en
Inventor
Jürgen Seidel
Wilfried Bald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1365869A1 publication Critical patent/EP1365869A1/en
Application granted granted Critical
Publication of EP1365869B1 publication Critical patent/EP1365869B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • B21B13/04—Three-high arrangement
    • 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
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B2031/206—Horizontal offset of work rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B21B2267/065—Top and bottom roll have different diameters; Asymmetrical rolling
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/10—Driving arrangements for rolls which have only a low-power drive; Driving arrangements for rolls which receive power from the shaft of another roll
    • 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
    • B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls

Definitions

  • the invention relates to a rolling mill for the production of flat rolled strips with the desired strip profile elevation, with work rolls supported on at least one support roll, the work rolls having different diameters, the thicker work roll being connected to a drive and the thinner work roll running as a "drag roll”.
  • Rolling mills with different diameters of the work rolls are known.
  • a rolling mill is described in US Pat. No. 2,139,872, in which, in order to achieve the most effective possible reduction of the rolled strip during rolling, two work rolls of different diameters supported on support rolls are arranged. It has proven to be advantageous here to drive only the larger work roll and to let the smaller roll run as a drag roll.
  • Known rolling mills of this type are advantageously used in the rear stands of a rolling mill with the aim of reducing the rolling force and the drive power and reducing the edge drop, particularly in the case of high-carbon steel.
  • the thermal crowning and wear of the work rolls and their elastic deformations are subject to relatively large changes within a rolling program. Without any correction by actuators, the strip contour changes as the rolling material throughput increases. This effect differs from scaffold to scaffold or from stitch to stitch. In addition to the strip contour, this also changes the predefined hot strip flatness and subsequently the cold strip flatness.
  • the object of the invention is to further modify the known rolling mill with its different work roll diameters in such a way that a strip of high quality is produced and these stands can be used universally.
  • That at least one of the work rolls is designed to be adjustable in the outlet direction and
  • the back-up rolls and the work rolls are provided with a curved contour running essentially over the entire length of the bale (CVC cut (continuously variable crown), which is defined by a polynomial of at least second order), which are offset by 180 ° relative to one another arranged and which is designed such that the two bale contours of the work rolls complement each other to form a symmetrical contour of the roll gap.
  • CVC cut continuously variable crown
  • R (x) a 5 x 5 + a • x 4 + a 3 x 3 + a 2 • x 2 + a. x + a 0
  • the work rolls Since the work roll diameters are different, the work rolls also have different deflection and flattening behavior. In particular, the effects between the backup rolls and the work rolls are different. This applies in particular to a 3-roll stand in which only the thinner work roll is supported by a backup roll, since the thicker work roll roll any support is missing.
  • the contours of the work rolls were therefore designed differently according to the invention in order to compensate for these effects. The calculation of the required contour is done offline with the aim of creating a symmetrical roll gap under load.
  • the new roll stand concept is special in such a case
  • 3-roll stand applicable. These scaffolds can then advantageously also be used for the front scaffolds, for example, for loads that are not so high.
  • This 3-roll stand only the thicker work roll is driven and the thinner work roll runs as a drag roll.
  • the thicker work roll acts as a work roll that can transmit a high moment and at the same time serves as a backup roll.
  • the combination with the other, thinner work roll supported by a separate back-up roll then results in controllable rolling forces.
  • one of the work rolls is arranged according to the invention so as to avoid this ski formation.
  • the setting of this roll offset is u. a. controlled depending on the inlet and outlet thickness, the material strength of the rolled strip, the current diameter combination of the work rolls etc.
  • the non-driven work roll In the case of a roll stand that contains a non-driven, smaller work roll and that is not pretensioned (the roll gap corresponds approximately to the strip inlet thickness before the tapping), it is also advantageous to provide the non-driven work roll with an auxiliary drive, which then decouples after tapping / or is switched off.
  • the auxiliary drive also enables any necessary axial displacement of the work rolls during the breaks.
  • the work rolls are made of materials that differ in their wear behavior or of highly wear-resistant materials, for example using a powder metallurgical process, preferably the HIP process (hot isostatic pressing).
  • HIP process hot isostatic pressing
  • the material to be treated is treated in special autoclaves (HIP systems) with all-round pressure (up to 200 Mpa) and high temperature (depending on the material up to 2000 ° C) heated above its yield point and compressed at the same time.
  • Fig. 2 shows a 3-roll stand in a schematic side view.
  • a four-high stand 10 is shown with two work rolls 1, 2, which are supported on support rolls 3, 4.
  • a work roll 2 with a larger diameter is arranged below the rolled strip 6 and a work roll 1 with a smaller diameter is arranged above the rolled strip 6.
  • the larger work roll 2 is provided with a drive 5, while the thinner work roll 1 has no drive and only runs as a “drag roll” due to the contact with the roll belt 6.
  • the thinner work roll 1 is arranged horizontally displaceably in the direction of arrow 9 and in the exemplary embodiment shown in FIG Exit direction 7 of the rolled strip 6 offset by the amount 8 from its original position.
  • the contours of the surfaces of the work rolls 1, 2 with their associated support rolls 3, 4 are produced according to the invention by a CVC cut, calculated according to a polynomial of at least second order (this CVC cut is not visible in the side view of the roll stand 10 shown).
  • the upper work roll 1 can have a diameter of 400 mm, for example, the lower work roll 2 can have a diameter of 600 mm, while the support rolls 3, 4 each have a diameter of 1350 mm.
  • FIG. 2 shows a 3-roll stand 11, in which only the upper, thinner work roll 1 is supported on a support roll 3.
  • the thicker and driven work roll 2, on the other hand, is so large in diameter that higher moments can be transmitted and therefore this work roll 2 also serves as a backup roll.
  • the thinner work roll 1 is offset from its original position by the amount 8 in the outlet direction 7.
  • the upper working salts 1 can have a diameter of z. B. 600 mm and the upper support roller 3 has a diameter between 1400 and 1600 mm.
  • the diameter of the lower work roll 2, which is also used here as a backup roll, can, for. B. be 1400 mm.
  • FIGS. 1 and 2 show the application of the invention in two roll stands. Of course, the invention can also be applied to other roll stands with different numbers of rolls from the examples, for example in roll stands with intermediate rolls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The aim of the invention is to improve known roll stands ( 10 ) which are characterized by working rolls ( 1,2 ) of various diameters, in such a way that a strip is obtained which is largely free of tensions and undulations, has a desired strip profile superelevation, and can be used approximately universally. To this end, the support rolls ( 3,4 ) and the working rolls ( 1,2 ) are arranged in an axially displaceable manner in the roll stand ( 10,11 ), the position of at least one of the working rolls ( 1,2 ) can be adjusted in the discharge direction ( 7 ) of the roll strip ( 6 ), and that the support rolls ( 3,4 ) and the working rolls ( 1,2 ) are provided with a curved contour (continuously variable crown which is determined by an at least second order polynomial) which extends essentially over the whole surface length of the roll, said contours being staggered by 180° in relation to each other and respectively embodied in such a way that both contours of the working rolls ( 1,2 ) complete each other to form a symmetrical contour of the roll gap.

Description

WALZGERÜST ZUR HERSTELLUNG PLANER WALZBÄNDER MIT GEWÜNSCHTER BANDPROFILÜBERHÖHUNGROLLING STAND FOR THE PRODUCTION OF PLANNING ROLLING TILES WITH THE REQUIRED BELT PROFILE EXCESS
Die Erfindung betrifft ein Walzwerk zur Herstellung planer Walzbänder mit gewünschter Bandprofilüberhöhung, mit an zumindest einer Stützwalze abgestützten Arbeitswalzen, wobei die Arbeitswalzen unterschiedliche Durchmesser aufweisen, die dickere Arbeitswalze mit einem Antrieb verbunden ist und die dünnere Arbeitswalze als „Schleppwalze" mitläuft.The invention relates to a rolling mill for the production of flat rolled strips with the desired strip profile elevation, with work rolls supported on at least one support roll, the work rolls having different diameters, the thicker work roll being connected to a drive and the thinner work roll running as a "drag roll".
Walzwerke mit unterschiedlichen Durchmessern der Arbeitswalzen sind bekannt. So wird in der US-PS 2,139,872 ein Walzwerk beschrieben, in dem, um eine möglichst effektive Reduktion des Walzbandes während des Walzens zu erreichen, zwei an Stützwalzen abgestützte Arbeitswalzen mit unterschiedli- chem Durchmesser angeordnet sind. Hierbei hat sich als vorteilhaft erwiesen, nur die größere Arbeitswalze anzutreiben und die kleinere Walze als Schleppwalze mitlaufen zu lassen. Derartige bekannte Walzwerke werden mit Vorteil in den hinteren Gerüsten einer Walzstraße eingesetzt mit dem Ziel einer Verminderung der Walzkraft und der Antriebsleistung sowie einem geringeren Edge- Drop, besonders bei High-Carbon-Steel.Rolling mills with different diameters of the work rolls are known. For example, a rolling mill is described in US Pat. No. 2,139,872, in which, in order to achieve the most effective possible reduction of the rolled strip during rolling, two work rolls of different diameters supported on support rolls are arranged. It has proven to be advantageous here to drive only the larger work roll and to let the smaller roll run as a drag roll. Known rolling mills of this type are advantageously used in the rear stands of a rolling mill with the aim of reducing the rolling force and the drive power and reducing the edge drop, particularly in the case of high-carbon steel.
Beim Warmwalzen von Bandmaterial unterliegen innerhalb eines Walzprogramms die thermische Bombierung und der Verschleiß der Arbeitswalzen sowie deren elastische Verformungen relativ großen Veränderungen. Ohne Kor- rektur durch Stellglieder verändert sich mit zunehmend fortlaufendem Walzmaterialdurchsatz die Bandkontur. Dieser Effekt ist von Gerüst zu Gerüst bzw. von Stich zu Stich unterschiedlich. Damit ändert sich neben der Bandkontur auch die vorgegebene Warmbandplanheit und in der Folge auch die Kaltbandplan- heit. Aufgabe der Erfindung ist es, das bekannte Walzwerk mit seinen unterschiedlichen Arbeitswalzendurchmesser weiter so zu modifizieren, dass ein Band hoher Qualität erzeugt wird und diese Gerüste universell einsetzbar sind.When hot rolling strip material, the thermal crowning and wear of the work rolls and their elastic deformations are subject to relatively large changes within a rolling program. Without any correction by actuators, the strip contour changes as the rolling material throughput increases. This effect differs from scaffold to scaffold or from stitch to stitch. In addition to the strip contour, this also changes the predefined hot strip flatness and subsequently the cold strip flatness. The object of the invention is to further modify the known rolling mill with its different work roll diameters in such a way that a strip of high quality is produced and these stands can be used universally.
Die gestellte Aufgabe wird bei einem Walzwerk der genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 dadurch gelöst,The object is achieved in a rolling mill of the type mentioned with the characterizing features of claim 1,
- dass die Stützwalzen und die Arbeitswalzen im Walzgerüst axial verschiebbar angeordnet sind,that the support rolls and the work rolls are arranged axially displaceably in the roll stand,
- dass mindestens eine der Arbeitswalzen in Auslaufrichtung einstellbar ausgeführt ist und- That at least one of the work rolls is designed to be adjustable in the outlet direction and
- dass die Stützwalzen und die Arbeitswalzen mit einer im wesentlichen über die gesamte Ballenlänge verlaufenden gekrümmten Kontur (CVC-Schliff (Conti- nuously Variable Crown), der durch ein Polynom mindestens zweiter Ordnung festgelegt ist) versehen sind, die relativ zueinander um 180° versetzt angeordnet und die jeweils so ausgebildet ist, dass die beiden Ballenkonturen der Arbeitswalzen sich zu einer symmetrischen Kontur des Walzenspaltes komplementär ergänzen.- That the back-up rolls and the work rolls are provided with a curved contour running essentially over the entire length of the bale (CVC cut (continuously variable crown), which is defined by a polynomial of at least second order), which are offset by 180 ° relative to one another arranged and which is designed such that the two bale contours of the work rolls complement each other to form a symmetrical contour of the roll gap.
Durch die erfindungsgemäße Kombination, die bekannten unterschiedlich großen Arbeitswalzen mit einem CVC-Schliff (unter anderem bekannt aus der DE 37 120 43 C2; der CVC-Schliff bzw. die Walzenkontur folgt dabei einem Polynom zweiter oder höherer Ordnung) zu versehen sowie die Arbeits- und Stütze walzen sowohl axial wie auch in Auslaufrichtung verschiebbar anzuordnen, wird eine völlig neue Walzgerüstkonzeption erhalten, die anders als bei den bekannten Walzgerüsten universeller eingesetzt werden können und die Walzbänder mit hoher Planheit und gewünschter Bandprofilüberhöhung erzeugen. Als Profilstellglied für den CVC-Schliff der Arbeitswalzen ist es bei diesen Walzgerüsten vorteilhaft, den Schliff nach einem Polynom dritter oder höherer Ordnung, beispielsweise auch fünfter Ordnung zu berechnen und entsprechend auszuführen. Ein Polynom 5. Ordnung der allgemeinen Form:The combination according to the invention of providing the known differently sized work rolls with a CVC cut (known, among other things, from DE 37 120 43 C2; the CVC cut or the roll contour follows a second or higher order polynomial) and the working and support e rolls can be moved both axially and in the direction of discharge, a completely new roll stand concept is obtained which, unlike the known roll stands, can be used more universally and produce the rolled strips with high flatness and the desired strip profile elevation. As a profile actuator for the CVC grinding of the work rolls, it is advantageous in these roll stands to calculate the grinding according to a third or higher order polynomial, for example also a fifth order, and to carry it out accordingly. A 5th order polynomial of the general form:
R(x) = a5 x5 + a • x4 + a3 x3 + a2 • x2 + a. x + a0 R (x) = a 5 x 5 + a • x 4 + a 3 x 3 + a 2 • x 2 + a. x + a 0
Würde dann beispielsweise für eine 1900 mm lange Walze folgende Parameter haben und zwarWould then have the following parameters for a 1900 mm long roller, for example
• für ein Koordinatensystem R(x) an der Walzenkante a0 = 0,349712 • 103 mm (Radius der Arbeitswalze) aι = 0,733199 * 10"3 a2 = 0,198038 » 10"3 mm"1 a3 = - 0,536180 » 10"3 mm"2 a4 = 0,368442 • 10"11 mm"3 a5 = - 0,775668 • 10"15 mm"4 • for a coordinate system R (x) at the roll edge a 0 = 0.349712 • 10 3 mm (radius of the work roll) aι = 0.733199 * 10 "3 a 2 = 0.198038 » 10 "3 mm " 1 a 3 = - 0.536180 »10 " 3 mm "2 a 4 = 0.368442 • 10 " 11 mm "3 a 5 = - 0.775668 • 10 " 15 mm "4
• für ein Koordinatensystem R(x) in der Walzenmitte a0 = 0,350000 • 103 mm (Radius der Arbeitswalze) aι = - 0,544375 • 10"3 a2 = 0,000000 mm"1 a3 = 0,163860 » 10"8 mm"2 a4 = - 0,590250 • 10"28 mm"3 a5 = - 0,775668 - 10"15 mm"4 • for a coordinate system R (x) in the middle of the roll a 0 = 0.350000 • 10 3 mm (radius of the work roll) aι = - 0.544375 • 10 "3 a 2 = 0.000000 mm " 1 a 3 = 0, 163860 »10 " 8 mm "2 a 4 = - 0.590250 • 10 " 28 mm "3 a 5 = - 0.775668 - 10 " 15 mm "4
Da die Arbeitswalzendurchmesser unterschiedlich sind, haben die Arbeitswalzen auch ein unterschiedliches Durchbiege- und Abplattungsverhalten. Speziell die Effekte zwischen den Stützwalzen und den Arbeitswalzen sind unterschiedlich. Dies gilt insbesondere für ein 3-Walzengerüst, bei dem nur die dünnere Arbeitswalze von einer Stützwalze abgestützt wird, da bei der dickeren Arbeits- walze jegliche Abstützung fehlt. Die Konturen der Arbeitswalzen wurden deshalb gemäß der Erfindung unterschiedlich gestaltet, um diese Effekte zu kompensieren. Die Berechnung der erforderlichen Kontur geschieht dabei offline mit dem Ziel, einen unter Last symmetrischen Walzspalt zu erzeugen.Since the work roll diameters are different, the work rolls also have different deflection and flattening behavior. In particular, the effects between the backup rolls and the work rolls are different. This applies in particular to a 3-roll stand in which only the thinner work roll is supported by a backup roll, since the thicker work roll roll any support is missing. The contours of the work rolls were therefore designed differently according to the invention in order to compensate for these effects. The calculation of the required contour is done offline with the aim of creating a symmetrical roll gap under load.
Das neue Walzgerüstkonzept ist besonderes bei einem derartigenThe new roll stand concept is special in such a case
3-Walzengerüst anwendbar. Diese Gerüste können vorteilhaft beispielsweise für nicht so hohe Belastungen dann auch für die vorderen Gerüste eingesetzt werden. Auch bei diesem 3-Walzengerüst wird nur die dickere Arbeitswalze angetrieben und die dünnere Arbeitswalze läuft als Schleppwalze mit. Die dik- kere Arbeitswalze fungiert dabei als Arbeitswalze, die ein hohes Moment übertragen kann und die dabei gleichzeitig als Stützwalze dient. Die Kombination mit der anderen, von einer separaten Stützwalze abgestützten, dünneren Arbeitswalze ergibt dann beherrschbare Walzkräfte.3-roll stand applicable. These scaffolds can then advantageously also be used for the front scaffolds, for example, for loads that are not so high. With this 3-roll stand, only the thicker work roll is driven and the thinner work roll runs as a drag roll. The thicker work roll acts as a work roll that can transmit a high moment and at the same time serves as a backup roll. The combination with the other, thinner work roll supported by a separate back-up roll then results in controllable rolling forces.
Da durch die gegebenen Randbedingungen beim Einsatz von Arbeitswalzen mit unterschiedlichen Durchmessern besonders beim Walzen von dickem Band mit Skibildung (Aufbiegung der Bandvorderkanten) zu rechnen ist, ist zwecks Vermeidung dieser Skibildung erfindungsgemäß eine der Arbeitswalzen in Auslaufrichtung verstellbar angeordnet. Die Einstellung dieses Walzenversatzes wird u. a. abhängig von der Ein- und Auslaufdicke, der Materialfestigkeit des Walzbandes, der aktuellen Durchmesserkombination der Arbeitswalzen etc. gesteuert.Since the given boundary conditions when using work rolls with different diameters, especially when rolling thick strip with ski formation (bending of the front edge of the strip) is to be expected, one of the work rolls is arranged according to the invention so as to avoid this ski formation. The setting of this roll offset is u. a. controlled depending on the inlet and outlet thickness, the material strength of the rolled strip, the current diameter combination of the work rolls etc.
Bei einem Walzgerüst, das eine nicht angetriebene kleinere Arbeitswalze enthält und das nicht vorgespannt ist (der Walzenspalt entspricht vor dem Anstich in etwa der Bandeinlaufdicke) ist es vorteilhaft, auch die nicht angetriebene Arbeitswalze mit einem Hilfsantrieb zu versehen, der nach dem Anstich dann abgekoppelt und/oder abgeschaltet wird. Durch diese Maßnahme werden während des Walzens die in den vorderen Gerüsten häufig auftretenden Vibrationen (Gegeneinanderschwingen der Arbeitswalzen) vermieden, da dann während des Walzens die Arbeitswalzen antriebsmäßig entkoppelt sind. Mit Vorteil wird zusätzlich durch den Hilfsantrieb auch ein eventuell notwendiges axiales Verschieben der Arbeitswalzen in den Walzpausen ermöglicht.In the case of a roll stand that contains a non-driven, smaller work roll and that is not pretensioned (the roll gap corresponds approximately to the strip inlet thickness before the tapping), it is also advantageous to provide the non-driven work roll with an auxiliary drive, which then decouples after tapping / or is switched off. By this measure, the vibrations that frequently occur in the front stands (oscillation of the work rolls against each other) are avoided during the rolling, since then the work rolls are decoupled in terms of drive during rolling. Advantageously, the auxiliary drive also enables any necessary axial displacement of the work rolls during the breaks.
Um die durch die unterschiedlichen Arbeitswalzendurchmesser sich ergeben- den Randbedingungen zu kompensieren, ist es weiterhin gemäß der Erfindung möglich, für jeden der Arbeitswalzen sowie für jede ihrer Seiten in Abhängigkeit der jeweiligen Schiebeposition unterschiedliche Arbeitswalzenbiegekräfte einzustellen. Um der höheren Flächenpressung zwischen der dünnen Arbeitswalze mit ihrer Stützwalze zu begegnen, kann darüber hinaus vorgesehen werden, diese Walzen entsprechend zu verlängern.In order to compensate for the boundary conditions resulting from the different work roll diameters, it is further possible according to the invention to set different work roll bending forces for each of the work rolls and for each of their sides depending on the respective sliding position. In order to counter the higher surface pressure between the thin work roll with its backup roll, it can also be provided that these rolls be extended accordingly.
Um dem unterschiedlichen Verschleiß der Arbeitswalzen aufgrund ihrer unterschiedlichen Durchmesser zu begegnen, sind die Arbeitswalzen aus in ihrem Verschleißverhalten unterschiedlichen Materialien oder aus hoch- verschleißfesten Materialien gefertigt, beispielsweise nach einem pulvermetallurgischen Verfahren, vorzugsweise dem HIP-Verfahren (hot isostatic pressing). Beim HIP-Verfahren, wie es im Sonderdruck aus „Stahl" (1998), Heft 6, Seiten 38-40 beschrieben ist, wird das zu behandelnde Material in speziellen Autoklaven (HIP-Anlagen) bei allseitig wirkendem Druck (bis zu 200 Mpa) und hoher Temperatur (je nach Werkstoff bis 2000°C) über seine Fließgrenze erwärmt und gleichzeitig verdichtet.In order to counteract the different wear of the work rolls due to their different diameters, the work rolls are made of materials that differ in their wear behavior or of highly wear-resistant materials, for example using a powder metallurgical process, preferably the HIP process (hot isostatic pressing). In the HIP process, as described in the special print from "Stahl" (1998), number 6, pages 38-40, the material to be treated is treated in special autoclaves (HIP systems) with all-round pressure (up to 200 Mpa) and high temperature (depending on the material up to 2000 ° C) heated above its yield point and compressed at the same time.
Weitere Einzelheiten der Erfindung werden nachfolgend an in schematischen Zeichnungsfiguren dargestellten Ausführungsbeispielen näher erläutert.Further details of the invention are explained in more detail below using exemplary embodiments illustrated in schematic drawing figures.
Es zeigen:Show it:
Fig. 1 ein Quarto-Gerüst in schematischer Seitenansicht,1 a four-high stand in a schematic side view,
Fig. 2 ein 3-Walzengerüst in schematischer Seitenansicht. In Figur 1 ist ein Quarto-Gerüst 10 dargestellt mit zwei Arbeitswalzen 1 , 2, die sich an Stützwalzen 3, 4 abstützen. Unterhalb des Walzbandes 6 ist eine Arbeitswalze 2 mit größerem und oberhalb des Walzbandes 6 eine Arbeitswalze 1 mit kleinerem Durchmesser angeordnet. Die größere Arbeitswalze 2 ist mit einem Antrieb 5 versehen, während die dünnere Arbeitswalze 1 keinen Antrieb besitzt und lediglich durch den Kontakt mit dem Walzband 6 als „Schleppwalze" mitläuft. Die dünnere Arbeitswalze 1 ist in Pfeilrichtung 9 horizontal verschiebbar angeordnet und im dargestellten Ausführungsbeispiel in Auslaufrichtung 7 des Walzbandes 6 um den Betrag 8 gegenüber ihrer ursprünglichen Lage versetzt.Fig. 2 shows a 3-roll stand in a schematic side view. In Figure 1, a four-high stand 10 is shown with two work rolls 1, 2, which are supported on support rolls 3, 4. A work roll 2 with a larger diameter is arranged below the rolled strip 6 and a work roll 1 with a smaller diameter is arranged above the rolled strip 6. The larger work roll 2 is provided with a drive 5, while the thinner work roll 1 has no drive and only runs as a “drag roll” due to the contact with the roll belt 6. The thinner work roll 1 is arranged horizontally displaceably in the direction of arrow 9 and in the exemplary embodiment shown in FIG Exit direction 7 of the rolled strip 6 offset by the amount 8 from its original position.
Die Konturen der Oberflächen der Arbeitswalzen 1 , 2 mit ihren zugeordneten Stützwalzen 3, 4 sind erfindungsgemäß durch einen CVC-Schliff, berechnet nach einem Polynom mindestens zweiter Ordnung gefertigt (in der dargestellten Seitenansicht des Walzgerüstes 10 ist dieser CVC-Schliff nicht sichtbar). Die obere Arbeitswalze 1 kann beispielsweise einen Durchmesser von 400 mm, die untere Arbeitswalze 2 von 600 mm haben, während die Stützwalzen 3, 4 einen Durchmesser von jeweils 1350 mm aufweisen.The contours of the surfaces of the work rolls 1, 2 with their associated support rolls 3, 4 are produced according to the invention by a CVC cut, calculated according to a polynomial of at least second order (this CVC cut is not visible in the side view of the roll stand 10 shown). The upper work roll 1 can have a diameter of 400 mm, for example, the lower work roll 2 can have a diameter of 600 mm, while the support rolls 3, 4 each have a diameter of 1350 mm.
In Figur 2 ist ein 3-Walzengerüst 11 dargestellt, bei dem sich nur die obere dünnere Arbeitswalze 1 an einer Stützwalze 3 abstützt. Die dickere und angetriebene Arbeitswalze 2 ist dagegen so groß in ihrem Durchmesser gewählt, das höhere Momente übertragen werden können und deshalb diese Arbeitswalze 2 auch gleichzeitig als Stützwalze dient. Auch bei diesem Beispiel der Fig. 2 ist die dünnere Arbeitswalze 1 um den Betrag 8 in Auslaufrichtung 7 aus ihrer ursprünglichen Lage versetzt angeordnet. Die obere Arbeitsalze 1 kann dabei einen Durchmesser von z. B. 600 mm haben und die obere Stützwalze 3 einen Durchmesser zwischen 1400 und 1600 mm. Der Durchmesser der unteren Arbeitswalze 2, die hier gleichzeitig als Stützwalze eingesetzt ist, kann z. B. 1400 mm betragen. Die in den Figuren 1 und 2 gezeigten Beispiele zeigen die Anwendung der Erfindung in zwei Walzgerüsten. Selbstverständlich kann die Erfindung auch auf andere Walzgerüste mit von den Beispielen unterschiedlichen Anzahlen von Walzen angewendet werden, beispielsweise in Walzgerüsten mit Zwischenwalzen. FIG. 2 shows a 3-roll stand 11, in which only the upper, thinner work roll 1 is supported on a support roll 3. The thicker and driven work roll 2, on the other hand, is so large in diameter that higher moments can be transmitted and therefore this work roll 2 also serves as a backup roll. In this example of FIG. 2 too, the thinner work roll 1 is offset from its original position by the amount 8 in the outlet direction 7. The upper working salts 1 can have a diameter of z. B. 600 mm and the upper support roller 3 has a diameter between 1400 and 1600 mm. The diameter of the lower work roll 2, which is also used here as a backup roll, can, for. B. be 1400 mm. The examples shown in FIGS. 1 and 2 show the application of the invention in two roll stands. Of course, the invention can also be applied to other roll stands with different numbers of rolls from the examples, for example in roll stands with intermediate rolls.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Arbeitswalze1 work roll
2 Arbeitswalze2 work roll
3 Stützwalze3 backup roller
4 Stützwalze4 backup roller
5 Antrieb Arbeitswalze5 Work roll drive
6 Walzgut6 rolling stock
7 Auslaufrichtung7 outlet direction
8 Walzenversatz8 roller offset
9 Verschieberichtung9 direction of displacement
10 4-Walzengerüst10 4-roll stand
11 3-Walzengerüst 11 3-roll stand

Claims

Ansprüche Expectations
1. Walzwerk zur Herstellung planer Walzbänder (6) mit gewünschter Bandprofilüberhöhung, mit an zumindest einer Stützwalze (3, 4) abgestützen Arbeits- walzen (1 , 2), wobei die Arbeitswalzen (1 , 2) unterschiedliche Durchmesser aufweisen, die dickere Arbeitswalze (2) mit einem Antrieb (5) verbunden ist und die dünnere Arbeitswalze (1) als „Schleppwalze" mitläuft, dadurch gekennzeichnet,1. Rolling mill for the production of flat rolled strips (6) with the desired strip profile elevation, with work rolls (1, 2) supported on at least one support roll (3, 4), the work rolls (1, 2) having different diameters, the thicker work roll ( 2) is connected to a drive (5) and the thinner work roll (1) runs as a "drag roll", characterized in that
- dass die Stützwalzen (3, 4) und die Arbeitswalzen (1 , 2) im Walzgerüst (10, 11) axial verschiebbar angeordnet sind,- That the support rolls (3, 4) and the work rolls (1, 2) in the roll stand (10, 11) are arranged to be axially displaceable,
- dass mindestens eine der Arbeitswalzen (1 , 2) in Auslaufrichtung (7) des Walzbandes (6) einstellbar ausgeführt ist und- That at least one of the work rolls (1, 2) is designed to be adjustable in the outlet direction (7) of the rolled strip (6) and
- dass die Stützwalzen (3, 4) und die Arbeitswalzen (1 , 2) mit einer im wesentlichen über die gesamte Ballenlänge verlaufenden gekrümmten Kontur (CVC- Schliff (Continuously Variable Crown), der durch ein Polynom mindestens zweiter Ordnung festgelegt ist) versehen sind, die relativ zueinander um 180° versetzt angeordnet und die jeweils so ausgebildet ist, dass die beiden Ballenkonturen der Arbeitswalzen (1 , 2) sich zu einer symmetrischen Kontur des Walzenspaltes komplementär ergänzen.- That the backup rolls (3, 4) and the work rolls (1, 2) are provided with a curved contour running essentially over the entire length of the bale (CVC cut (Continuously Variable Crown), which is defined by a polynomial of at least second order) , which are arranged offset by 180 ° relative to one another and which are each designed such that the two bale contours of the work rolls (1, 2) complement each other to form a symmetrical contour of the roll gap.
2. Walzwerk nach Anspruch 1 , dadurch gekennzeichnet, dass zum Ausgleich unterschiedlichen Durchbiege- und Abplattungsverhaltens die Arbeitswalzen (1 , 2) mit voneinander unterschiedlichen Konturen (unterschiedlicher CVC-Schliff) ausgebildet sind, wobei zur Berechnung der Konturen ein Polynom dritter oder höherer Ordnung, beispielsweise ein Polynom fünfter Ordnung verwendet wird.2. Rolling mill according to claim 1, characterized in that in order to compensate for different deflection and flattening behavior, the work rolls (1, 2) are designed with different contours (different CVC cuts), a third-order or higher-order polynomial being used to calculate the contours, for example, a fifth order polynomial is used.
3. Walzwerk (10, 11) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Walzenversatz (8) der Arbeitswalze (1 , 2) in Auslaufrichtung (7) kontinuierlich einstellbar ist. 3. Rolling mill (10, 11) according to claim 1 or 2, characterized in that the roll offset (8) of the work roll (1, 2) in the outlet direction (7) is continuously adjustable.
4. Walzwerk (10, 11) nach Anspruch 3, dadurch gekennzeichnet, dass die Größe des Walzenversatzes (8) in Abhängigkeit von u. a. der Ein- und Auslaufdicke des Walzbandes (6), seiner Materialfestigkeit und der aktuellen Durchmesserkombination der Arbeitswalzen (1 , 2) gesteuert wird.4. Rolling mill (10, 11) according to claim 3, characterized in that the size of the roll offset (8) depending on u. a. the inlet and outlet thickness of the rolled strip (6), its material strength and the current diameter combination of the work rolls (1, 2) is controlled.
5. Walzwerk (10, 11) nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass für jede der Arbeitswalzen (1 , 2) sowie für jede ihrer Seiten in Abhängigkeit von ihrer Schiebeposition jeweils unterschiedliche Arbeitswalzenbiegekräfte einstellbar sind.5. Rolling mill (10, 11) according to one or more of claims 1 to 4, characterized in that different work roll bending forces can be set for each of the work rolls (1, 2) and for each of their sides depending on their sliding position.
6. Walzwerk (10, 11) nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass nur die dünnere Arbeitswalze (1) von einer Stützwalze (3) abgestützt wird.6. Rolling mill (10, 11) according to one or more of claims 1 to 5, characterized in that only the thinner work roll (1) is supported by a backup roll (3).
7. Walzwerk (10, 11) nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die dünnere Arbeitswalze (1 ) mit einem abschaltbaren und/oder abkuppelbaren Hilfsantrieb verbunden ist.7. Rolling mill (10, 11) according to one or more of claims 1 to 6, characterized in that the thinner work roll (1) is connected to a switchable and / or uncouplable auxiliary drive.
8. Walzwerk (10, 11) nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Arbeitswalzen (1 , 2) aus in ihrem Ver- schleißverhalten voneinander abweichenden unterschiedlichen Materialien und/oder aus hoch verschleißfesten Materialien nach einem pulvermetallurgischen Verfahren gefertigt sind, beispielsweise nach dem HIP-Verfahren (hot isostatic pressing). 8. Rolling mill (10, 11) according to one or more of claims 1 to 7, characterized in that the work rolls (1, 2) from different wear materials differing in their wear behavior and / or from highly wear-resistant materials according to a powder metallurgical process are manufactured, for example by the HIP (hot isostatic pressing) process.
EP02702282A 2001-01-23 2002-01-18 Roll stand for producing plane roll strips having a desired strip profile superelevation Expired - Lifetime EP1365869B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10102821A DE10102821A1 (en) 2001-01-23 2001-01-23 Rolling mill used for producing planar strips comprises working rollers and support rollers axially arranged in a roll stand
DE10102821 2001-01-23
PCT/EP2002/000479 WO2002058860A1 (en) 2001-01-23 2002-01-18 Roll stand for producing plane roll strips having a desired strip profile superelevation

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EP1365869A1 true EP1365869A1 (en) 2003-12-03
EP1365869B1 EP1365869B1 (en) 2004-10-06

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EP (1) EP1365869B1 (en)
JP (1) JP2004516945A (en)
KR (1) KR100819834B1 (en)
CN (1) CN1262363C (en)
AT (1) ATE278483T1 (en)
BR (1) BR0206092B1 (en)
CA (1) CA2431775C (en)
CZ (1) CZ298565B6 (en)
DE (2) DE10102821A1 (en)
ES (1) ES2229089T3 (en)
RU (1) RU2280518C2 (en)
TR (1) TR200402692T4 (en)
UA (1) UA75385C2 (en)
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TR200402692T4 (en) 2004-11-22
ES2229089T3 (en) 2005-04-16
KR100819834B1 (en) 2008-04-07
UA75385C2 (en) 2006-04-17
BR0206092B1 (en) 2010-06-29
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BR0206092A (en) 2004-01-06
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ATE278483T1 (en) 2004-10-15
CA2431775A1 (en) 2002-08-01
RU2003125863A (en) 2005-01-27
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EP1365869B1 (en) 2004-10-06
US20040040358A1 (en) 2004-03-04
CA2431775C (en) 2010-01-12
CZ298565B6 (en) 2007-11-07
US7251978B2 (en) 2007-08-07
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DE50201219D1 (en) 2004-11-11
WO2002058860A1 (en) 2002-08-01

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