EP1476262B1 - Casting roll and a method for producing a casting roll - Google Patents

Casting roll and a method for producing a casting roll Download PDF

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Publication number
EP1476262B1
EP1476262B1 EP02793061A EP02793061A EP1476262B1 EP 1476262 B1 EP1476262 B1 EP 1476262B1 EP 02793061 A EP02793061 A EP 02793061A EP 02793061 A EP02793061 A EP 02793061A EP 1476262 B1 EP1476262 B1 EP 1476262B1
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EP
European Patent Office
Prior art keywords
roll
casting
lateral surface
core
lateral
Prior art date
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EP02793061A
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German (de)
French (fr)
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EP1476262A2 (en
Inventor
Gerald Hohenbichler
Gerald Eckerstorfer
Thomas Reiter
Jean-Michel Damasse
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Primetals Technologies Austria GmbH
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Voest Alpine Industrienlagenbau GmbH
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Priority to AT02793061T priority Critical patent/ATE331578T1/en
Publication of EP1476262A2 publication Critical patent/EP1476262A2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels

Definitions

  • the invention relates to a casting roll for the continuous casting of thin metallic strips, in particular steel strips, in a two-roll or Einwalzeng tellstrom, with a roll core having an outer surface and a surrounding, shrunk, annular roll shell with an inner circumferential surface and with a central casting roll axis, and a method for producing such a casting roll.
  • Casting rolls of this type are used for producing metal strip with a strip thickness of up to 10 mm, wherein liquid metal is applied to the casting roll surface of at least one casting roll where it is at least partially solidified and shaped into the desired strip format. If the molten metal is predominantly applied to a casting roll, this is called single-roll casting. If the molten metal is introduced into a casting gap, which is formed by two spaced-apart casting rolls, wherein the molten metal is solidified on the two casting roll surfaces and from these a metal strip is formed, it is called Zweiwalzeng veiclar. In these production methods, large amounts of heat have to be dissipated from the casting roll surface into the interior of the casting roll in a short time.
  • the casting roll is equipped with an outer roll shell of a particularly thermally conductive material, preferably copper or a copper alloy, and an internal cooling with a cooling water circuit.
  • a particularly thermally conductive material preferably copper or a copper alloy
  • an internal cooling with a cooling water circuit Such casting rolls are already described, for example, in US Pat. No. 5,191,925 or DE-C 41 30 202.
  • US Pat. No. 5,191,925 discloses a casting roll in which two annular roll shells are mounted on a roll core equipped with cooling channels and the two roll shells are joined together by a welded connection or a roll sheath is produced by electrolytic deposition on the other roll sheath.
  • a casting roll can be seen in which a connection between a roll core and a roll shell is prepared by brazing, wherein between the roll core and the roll shell prior to assembly a suitable solder, preferably in the form of a strip of this Solder, must be applied and fixed.
  • the roll mantle is drawn onto the roll core by a thermal shrinking process, thus achieving a temporary bond followed by the time-consuming brazing process.
  • a casting roll for a strip casting machine in which rods are inserted in axial grooves of the roll core between a roll core and a roll shell. These rods together with the roller core and the roll shell form a plurality of coolant channels. In order to ensure the cohesion of the components forms the inner roll shell surface with the radially outwardly facing surfaces of the rods used a shrink connection.
  • the proposed braze joint is not suitable in addition to the complex production in the occurring, locally high thermal loads, to prevent such migration of the roll shell sustainable.
  • At least one of the opposing a shrink joint forming lateral surfaces has elevations and depressions in the lateral surface, which are oriented at least partially in the direction of the casting roll axis and the radial extent is at least 2 ⁇ m and the elevations and depressions on at least one of the mutually opposite lateral surfaces form a surface structure in which the lateral surface has a roughness R z between 2 ⁇ m and 1500 ⁇ m, preferably between 10 ⁇ m and 500 ⁇ m.
  • the elevations and depressions on the lateral surface form support surfaces, which are predominantly oriented substantially parallel to the casting roll axis and having a radial minimum extent, produce an additional resistance to a traveling movement of the roll shell relative to the roll core in the circumferential direction.
  • support surfaces which are predominantly oriented substantially parallel to the casting roll axis and having a radial minimum extent, produce an additional resistance to a traveling movement of the roll shell relative to the roll core in the circumferential direction.
  • R z defined roughness
  • these elevations and depressions in and immediately around an axis-normal casting-roll plane of symmetry form on at least one of the mutually opposite lateral surfaces a surface structure in which the lateral surface has a roughness Rz between 2 ⁇ m and 1500 ⁇ m.
  • This effect is achieved in an optimum manner when the elevations and recesses substantially in the direction of the casting roll axis and directed radially with support surfaces form a longitudinal extension, which are smaller than or equal to the lateral surface length.
  • Such oriented support surfaces arise in an example mechanical machining of the lateral surface in the direction of the casting roll axis, such as by knurling.
  • the hereby adjusting approximately V-shaped groove formation on a lateral surface results in a firm connection with the further lateral surface, if the distance between the groove tips preferably between 0.1 and 1.7 mm and the distance between valley and tip between 0.06 and 0 , 8 lies.
  • the roll core and the annular roll shell are formed in the region of the opposite lateral surfaces made of materials of different hardness and at least the lateral surface of the component having the higher lateral surface hardness values is provided with the predetermined roughness.
  • the roughness pattern of the harder mantle surface is impressed into the softer mantle surface, resulting in a full-surface micro-mating fit which is clearly superior to the friction fit achievable in the conventional shrinking process.
  • a hardness difference between the edge layers in the region of the harder and the soft lateral surfaces should be at least 20%, but preferably more than 50%, the hardness of the softer lateral surface should be below 220 HB, preferably below 150 HB.
  • the steel roll core and the annular roll shell from copper or a copper alloy.
  • the formation of the roll core made of steel gives the cast roll construction the necessary operational stability and the formation of the roll mantle of copper or a copper alloy is absolutely necessary for a sufficient heat removal from the molten metal applied to it.
  • a bonding layer is preferably arranged between the roll core and the roll shell and the material forming the tie-layer on one of the two deposited associated with each other lateral surfaces.
  • the bonding layer consists of a metal or a metal alloy, wherein wear-resistant granules can be embedded in this bonding layer.
  • wear-resistant granules consist of grains or lamellae of metal oxides, such as aluminum oxide, zirconium oxide or similar materials or their mixtures.
  • the granules may also consist of grains or fins of carbides, such as titanium carbide, tungsten carbide, silicon carbide or similar materials with comparable properties or their mixtures. Mixtures of metal oxides and carbides are useful.
  • the connecting layer can also be formed by a very hard material, for example a plasma ceramic, wherein this material must be applied to one of the lateral surfaces such that the desired roughness also sets at the same time.
  • the bonding layer preferably has a layer thickness of 0.05 to 1.2 mm.
  • the wear-resistant granules embedded in them have a particle size of less than 40 ⁇ m, preferably less than 10 ⁇ m.
  • the roll core has grooves distributed parallel to the casting roll axis on its lateral surface, are inserted into the fuse strips, which project beyond the lateral surface of the roll core in the radial direction by at least 2 microns.
  • the over the lateral surface of the roll core protruding fuse strips press with the shrink connection in the lateral surface of the roll shell and form itself a support surface against the jacket twist and produce by their impression in the roll shell a counter-supported support surface in this.
  • these securing strips project beyond the lateral surface of the roller core no more than 1500 ⁇ m, since the possibilities of embossing in the roller shell are limited. If only by the pressing of the fuse strips in the roll shell a rich juxtaposition of the two lateral surfaces can not be achieved, it is preferably also possible to make shallow milled with shallow depth in the roll shell at the points that are opposite to the grooves in the roll core.
  • the securing strips project beyond the lateral surface of the roller core in the radial direction between 500 ⁇ m and 15 mm.
  • the securing strips are also in the inner circumferential surface of the roll mantle grooves milled, which lie opposite the grooves in the lateral surface of the roll core and wherein opposing grooves each receive a fuse strip.
  • the flanks of the securing strip and the flanks of the grooves form corresponding support surfaces oriented in the direction of the casting roll axis. A large-area shrinkage connection between the roll core and the roll shell is possible if the sum depth of two grooves is greater than the height of the fuse strip receiving them.
  • Typical groove depths are 2 to 15 mm in the roll core and 0.4 to 5 mm in the roll shell.
  • the width of the fuse strip is between 4 and 45 mm, preferably between 5 and 25 mm.
  • Usually less than 16, preferably less than 8 fuse strips or grooves are preferably distributed regularly distributed on the roll core at its periphery. At least 3 grooves are necessary for a sufficient rotation of the roll shell, if at the same time an uneven forces and stress distribution in the roll shell to be avoided.
  • the length of the grooves or the fuse strips is less than the lateral surface length of the roller core. Thus, the risk of slipping out of the fuse strips is avoided under operating load.
  • a casting roll which is suitable for the continuous casting of thin metallic strips, in particular steel strips, by the two-roll or Einwalzeng tellclar and consisting essentially of a roll core having an outer circumferential surface and a surrounding, shrunk, annular roll shell with an inner circumferential surface and a centric G manwalzenachse
  • the lateral surface of the roll core and the inner circumferential surface of the roll shell is prepared for a shrink connection and the roll shell is raised with respect to the roll core elevated temperature on the roll core.
  • the invention consists in that on at least one of the mutually associated jacket surfaces forming a shrink connection at least partially oriented in the direction of the casting roll axis elevations and depressions are produced with a radial extent of at least 2 ⁇ m by mechanical processing and on at least one of the mating surfaces produced mating surfaces and depressions form a surface structure in which the lateral surface has a roughness between 2 .mu.m and 1500 ⁇ m has. Subsequently, a controlled cooling of the casting roll takes place at room temperature.
  • the preparations for the formation of a shrink connection consist essentially in that a matched to the operating conditions of the casting roll fit selected and the roll core is made with a corresponding outer diameter and the roll shell with a corresponding inner diameter.
  • the feature essential to the invention consists in the design of one of the two cooperating lateral surfaces with a surface structure in the elevations and depressions form support surfaces, which are oriented substantially parallel to the casting roll axis and have a radial minimum extent to a corresponding resistance to a migration of the roll shell in the circumferential direction to ensure.
  • an oriented surface structure is incorporated in the lateral surface, which has a roughness R z between 10 .mu.m and 500 .mu.m.
  • the formation of a surface structure has proved to be particularly favorable, in which the elevations and depressions incorporated on at least one of the mutually associated lateral surfaces are produced with support surfaces oriented essentially radially and in the direction of the casting roll axis, which have a longitudinal extension which is less than or equal to Lateral surface length are.
  • the incorporated in one of the lateral surfaces oriented surface structure penetrates when producing the shrink connection with significantly reduced Abplattungstendenz in the surface of the mantle surface when the roll core and the annular roll shell are made of materials of different hardness and formed with a higher lateral surface hardness value component with the predetermined roughness R z is provided.
  • the hardness values of the component formed with a higher lateral surface hardness value can additionally be increased by hardening, nitriding, carburizing or a comparable method. This can be largely dispensed with adhesion-improving additional coating on one of the mating lateral surfaces.
  • the directional surface structure or the roughness Rz is produced in a simple manner by mechanical processing of the mantle surface, such as knurling, bumping or milling.
  • a correspondingly directed surface structure having a predetermined roughness can be produced in a simple manner, which is predominantly in the direction the casting roll axis oriented and a jacket twist counteracting support surfaces.
  • the bonding between the roll core and the roll shell can be further improved if a bonding layer is deposited on one of the mating surfaces, wherein the predetermined roughness is advantageously applied to one lateral surface and the bonding layer is applied in a layer thickness of 0.05 to 1.2 mm is deposited.
  • the compound layer of a metal or a metal alloy is preferably applied by electrodeposition or by plasma deposition on the lateral surface.
  • the granules already described above can be incorporated into the bonding layer.
  • a variant of the described method for producing a casting roll with a correspondingly stable rotation between the roll core and roll shell is prepared by the lateral surface of the roll core and the inner surface of the roll shell are prepared for a shrink connection, that incorporated on the lateral surface of the roll core parallel to the casting roll axis grooves and be used in these fuse strips, which projects beyond the lateral surface of the roll core in the radial direction at least 2 ⁇ m, preferably projecting from 500 microns to 15 mm, and that the roll jacket is mounted on the roll core with a temperature which is higher than that of the roll core, wherein a shrink connection is produced between the fuse bars and the roll shell and at least one tight connection between the roll core and the roll shell. Subsequently, a controlled cooling of the casting roll takes place at room temperature.
  • a casting roll according to the invention for the continuous casting of steel strips in a two-roll continuous casting is shown schematically in a partial section. It consists of a roller core 1 made of steel, which ends in roll neck 1 a, 1 b for support in G manwalzenlagern not shown.
  • a cylindrical roll shell 2 made of a copper alloy surrounds the roll core 1 and is fixed in rotation therewith by means of a shrink connection 3.
  • the shrink joint 3 is formed by the outer circumferential surface 4 of the roll core 2 and the inner circumferential surface 5 of the roll shell 2, wherein the two lateral surfaces 4 and 5 achieved by a directed surface structure increased compared to conventional shrink joints torsional resistance. Illustrated by way of example in FIG.
  • the lateral surface 4 is provided with a knurling 6, wherein the grooves 7 produced by the knurling are oriented in the direction of the casting roll axis 8 and form V-shaped support surfaces 9 extending substantially radially and in the direction of the casting roll axis 8, which act in large numbers as resistance surfaces against a relative rotation of the roll shell 2 to the roll core 1.
  • a metallic compound layer 10 is, for example, deposited electrolytically and forms a relatively soft, low hardness layer, in which the structured outer surface 4 of the roll core 1 in the manufacture of the shrink joint, without significantly altering its structure, penetrates.
  • the casting roll is provided with an internal circulating liquid cooling, wherein cooling liquid is supplied via a central supply line 11 and radial branch lines 12 to annular milled into the outer circumferential surface 4 of the roll core 1 coolant channels 13 and discharged via further radial stubs 14 and a central discharge line 15 again.
  • cooling liquid is supplied via a central supply line 11 and radial branch lines 12 to annular milled into the outer circumferential surface 4 of the roll core 1 coolant channels 13 and discharged via further radial stubs 14 and a central discharge line 15 again.
  • the casting roll is shown with a shrinkage connection 3 according to the invention according to a further embodiment in a cross section.
  • the roller core 1 is analogous as in Fig. 1 equipped with a coolant circuit, which consists of a central supply line 11, radial stub lines 12, radial stub lines 14 and a central discharge line 15.
  • the annular coolant channels 13 are rotated in the roll shell 2 in the embodiment shown in FIG.
  • Parallel to the casting roll axis 8 four grooves 7 are milled into the outer circumferential surface 4 of the roll core 1 and in each of these grooves 7 a fuse strip 17 is inserted, which projects beyond the outer surface 4 of the roll core 1 by a small piece.
  • 2 grooves 18 shallow depth are milled into the inner circumferential surface 5 of the roll shell, which lie opposite the grooves 7 in the roll core 1 and collect the fuse strips 17 together.
  • the lateral flanks 19, 20 of the securing strips 17 and the lateral flanks 21, 22 of the grooves 7, 18 milled in the circumferential cooling ribs in the roll core 1 and in the roll shell 2 (in the region of the cooling fins 24 extending in the circumferential direction) act as support surfaces against the jacket twisting.
  • the fuse strip 17 is shown in Fig. 3 in an oblique view.
  • the fuse strip 17 contains recesses 23 for the undisturbed coolant bushing, these recesses 23 are aligned in the installed position of the fuse strip with the annular coolant channels 13.
  • recesses 23 are each preferably flowed through in the opposite direction to ensure uniform roll jacket cooling. This is indicated by arrows.
  • casting roll is not limited to the embodiments shown in detail, but also includes casting rolls with a roll shell, with substantially central axial cooling holes, and casting rolls with incorporated into the roll core or the roll shell trapezoidal thread-like cooling channels, or on casting rolls in the roll core incorporated circumferential cooling ribs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Continuous Casting (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

A casting roll for the continuous casting of thin metal strips, in particular steel strips in a double-roll or roll-in installation. The roll comprises a roll core with an external casing and an annular roll jacket with an internal casing. The jacket surrounds the core and is being shrunk onto the latter. To prevent migratory motion of the roll jacket in relation to the roll core, the surface of at least one of the opposing casings that form a shrinkage connection has protuberances and indentations, which are oriented at least partially in the direction of the casting roll axis and extend radially for at least 2 mum.

Description

Die Erfindung betrifft eine Gießwalze für das Stranggießen von dünnen metallischen Bändern, insbesondere Stahlbändern, in einer Zweiwalzen- oder Einwalzengießanlage, mit einem Walzenkern mit einer äußeren Mantelfläche und einem diesen umgebenden, aufgeschrumpften, ringförmigen Walzenmantel mit einer inneren Mantelfläche und mit einer zentrischen Gießwalzenachse, sowie ein Verfahren zur Herstellung einer derartigen Gießwalze.The invention relates to a casting roll for the continuous casting of thin metallic strips, in particular steel strips, in a two-roll or Einwalzengießanlage, with a roll core having an outer surface and a surrounding, shrunk, annular roll shell with an inner circumferential surface and with a central casting roll axis, and a method for producing such a casting roll.

Gießwalzen dieser Art werden zur Herstellung von Metallband mit einer Banddicke bis zu 10mm eingesetzt, wobei flüssiges Metall auf die Gießwalzenoberfläche mindestens einer Gießwalze aufgebracht wird, dort zumindest teilweise erstarrt und in das gewünschte Bandformat umgeformt wird. Wird die Metallschmelze vorwiegend auf eine Gießwalze aufgebracht, spricht man von Einwalzengießverfahren. Wird die Metallschmelze in einen Gießspalt, der von zwei im Abstand voneinander angeordneten Gießwalzen gebildet wird, eingebracht, wobei die Metallschmelze an den beiden Gießwalzenoberflächen erstarrt und aus diesen ein Metallband geformt wird, so spricht man von Zweiwalzengießverfahren. Bei diesen Produktionsverfahren müssen in kurzer Zeit große Wärmemengen von der Gießwalzen-Oberfläche in das Innere der Gießwalze abgeführt werden. Dies wird erreicht, indem die Gießwalze mit einem äußeren Walzenmantel aus eine besonders wärmeleitfähigem Material, vorzugsweise Kupfer oder einer Kupferlegierung, und einer Innenkühlung mit einem Kühlwasserkreislauf ausgestattet ist. Derartige Gießwalzen sind beispielsweise bereits in der US-A 5,191,925 oder der DE-C 41 30 202 beschrieben.Casting rolls of this type are used for producing metal strip with a strip thickness of up to 10 mm, wherein liquid metal is applied to the casting roll surface of at least one casting roll where it is at least partially solidified and shaped into the desired strip format. If the molten metal is predominantly applied to a casting roll, this is called single-roll casting. If the molten metal is introduced into a casting gap, which is formed by two spaced-apart casting rolls, wherein the molten metal is solidified on the two casting roll surfaces and from these a metal strip is formed, it is called Zweiwalzengießverfahren. In these production methods, large amounts of heat have to be dissipated from the casting roll surface into the interior of the casting roll in a short time. This is achieved by the casting roll is equipped with an outer roll shell of a particularly thermally conductive material, preferably copper or a copper alloy, and an internal cooling with a cooling water circuit. Such casting rolls are already described, for example, in US Pat. No. 5,191,925 or DE-C 41 30 202.

Aus der US-A 5,191,925 ist eine Gießwalze zu entnehmen, bei der auf einem mit Kühlkanälen ausgestatteten Walzenkern zwei ringförmige Walzenmäntel aufgezogen sind und die beiden Walzenmäntel durch einer Schweißverbindung miteinander verbunden sind oder der eine Walzenmantel durch elektrolytische Ablagerung auf dem anderen Walzenmantel hergestellt wird.US Pat. No. 5,191,925 discloses a casting roll in which two annular roll shells are mounted on a roll core equipped with cooling channels and the two roll shells are joined together by a welded connection or a roll sheath is produced by electrolytic deposition on the other roll sheath.

Aus der DE-C 41 30 202 ist eine Gießwalze zu entnehmen, bei der eine Verbindung zwischen einem Walzenkern und einem Walzenmantel durch Hartlöten hergestellt wird, wobei zwischen dem Walzenkern und dem Walzenmantel vor dem Zusammenbau ein geeignetes Lötmittel, vorzugsweise in Form eines Bandes aus diesem Lötmittel, aufgebracht und befestigt werden muss. Der Walzenmantel wird durch einen thermischen Schrumpfprozess auf den Walzenkern aufgezogen und solcherart eine provisorische Verbindung erzielt, dem das zeitaufwendige Hartlötverfahren nachfolgt.From DE-C 41 30 202, a casting roll can be seen in which a connection between a roll core and a roll shell is prepared by brazing, wherein between the roll core and the roll shell prior to assembly a suitable solder, preferably in the form of a strip of this Solder, must be applied and fixed. The roll mantle is drawn onto the roll core by a thermal shrinking process, thus achieving a temporary bond followed by the time-consuming brazing process.

Bei konventionellen Stranggießanlagen sind im Anschluss an die Stranggießkokille in der Strangführung thermisch wesentlich geringer belastete Stütz- und Führungsrollen für die Stützung des gegossenen Strang bekannt (DE-C 40 27 225), bei denen ein Rollenmantel durch eine Schrumpfverbindung auf einem Rollenkern aufgezogen ist, wobei zwischen Rollenmantel und Rollenkern ein normgerechter Passsitz vorgesehen ist.In conventional continuous casting after the continuous casting mold in the strand guide thermally much less loaded support and leadership roles for the support of the cast strand known (DE-C 40 27 225), in which a roll shell is mounted by a shrink connection on a roll core, said between roller shell and roll core a standard fit is provided.

Aus der EP 0 246 188 A1 ist eine Gießwalze für eine Bandgießmaschine bekannt, bei der zwischen einem Walzenkern und einem Walzenmantel Stäbe in Axialnuten des Walzenkerns eingesetzt sind. Diese Stäbe bilden gemeinsam mit dem Walzenkern und dem Walzenmantel eine Vielzahl von Kühlmittelkanälen. Um den Zusammenhalt der Bauteile zu gewährleisten bildet die innere Walzenmantelfläche mit den radial nach außen gerichteten Flächen der eingesetzten Stäbe eine Schrumpfverbindung.From EP 0 246 188 A1 a casting roll for a strip casting machine is known, in which rods are inserted in axial grooves of the roll core between a roll core and a roll shell. These rods together with the roller core and the roll shell form a plurality of coolant channels. In order to ensure the cohesion of the components forms the inner roll shell surface with the radially outwardly facing surfaces of the rods used a shrink connection.

Bei Gießwalzen zum direkten Bandgießen von Metallen und insbesondere wenn Stahl vergossen wird, treten wegen der erforderlichen hohen Anlagenproduktivität extreme zyklische Wärmebelastungen am Walzenmantel auf. Es ist bekannt, dass eine spezifische Wärmeabfuhr von bis zu 15 MW/m2, und mehr, durch den Walzenmantel erfolgen muss. Bei Gießwalzenkonstruktionen der eingangs beschriebenen Art, die üblicherweise von einem auf einem Stahlkern aufgeschrumpften Kupferrohr gebildet sind, kommt es durch die mit den thermischen Belastungen verbundenen lokalen und zyklisch auftretenden Umfangsspannungsschwankungen zu Umfangskräften, die zu einem Wandern des Kupfermantels auf dem Stahlkern führen können. Durch diese Wanderbewegung kommt es an der Kontaktfläche von Kupfermantel und Stahlkern zu Adhäsions-Veränderungen, die typischerweise zu einer raschen Alterung der Haftverbindung führen. Dadurch wird die Lebensdauer des Kupfermantels bzw. der Haftverbindung deutlich herabgesetzt.In cast rolls for direct strip casting of metals, and especially when steel is cast, extreme cyclic heat loads on the roll shell occur due to the required high equipment productivity. It is known that a specific heat removal of up to 15 MW / m 2 , and more, must occur through the roll mantle. In the case of casting roll constructions of the type described in the introduction, which are usually formed by a copper tube shrunk onto a steel core, circumferential forces which can lead to a wandering of the copper jacket on the steel core occur as a result of the peripheral and cyclically occurring circumferential stress fluctuations associated with the thermal stresses. As a result of this traveling movement, adhesion changes occur at the contact surface of the copper jacket and steel core, which typically lead to rapid aging of the adhesive bond. As a result, the life of the copper jacket or the adhesive bond is significantly reduced.

Auch die vorgeschlagene Hartlötverbindung ist neben deren aufwendigen Herstellung bei den auftretenden, örtlich hohen thermischen Belastungen nicht geeignet, eine derartige Wanderbewegung des Walzenmantels nachhaltig zu verhindern.The proposed braze joint is not suitable in addition to the complex production in the occurring, locally high thermal loads, to prevent such migration of the roll shell sustainable.

Es ist daher die Aufgabe der vorliegenden Erfindung, diese beschriebenen Nachteile des Standes der Technik zu vermeiden und eine Gießwalze und ein Verfahren zur Herstellung einer derartigen Gießwalze vorzuschlagen, mit einer zwischen Walzenmantel und Walzenkern den hohen thermischen und mechanischen Belastungen widerstehende Verbindung, wobei Wanderbewegungen des Walzenmantels auf dem Walzenkern nachhaltig vermieden werden.It is therefore the object of the present invention to avoid these disadvantages of the prior art described and to propose a casting roll and a method for producing such a casting roll, with a between roll shell and roll core the high thermal and mechanical loads resisting compound, wherein migratory movements of the roll shell be avoided on the roll core sustainably.

Diese Aufgabe wird bei einer Gießwalze der eingangs beschriebenen Art dadurch gelöst, dass zumindest eine der einander gegenüberliegenden eine Schrumpfverbindung bildenden Mantelflächen Erhebungen und Vertiefungen in der Mantelfläche aufweist, die zumindest teilweise in Richtung der Gießwalzenachse orientiert sind und deren radiale Erstreckung mindestens 2µm beträgt und die Erhebungen und Vertiefungen an zumindest einer der einander gegenüberliegenden Mantelflächen eine Oberflächenstruktur ausbilden, bei der die Mantelfläche eine Rauigkeit Rz zwischen 2µm und 1500µm, vorzugsweise zwischen 10µm und 500µm, aufweist.This object is achieved in a casting roll of the type described above in that at least one of the opposing a shrink joint forming lateral surfaces has elevations and depressions in the lateral surface, which are oriented at least partially in the direction of the casting roll axis and the radial extent is at least 2μm and the elevations and depressions on at least one of the mutually opposite lateral surfaces form a surface structure in which the lateral surface has a roughness R z between 2 μm and 1500 μm, preferably between 10 μm and 500 μm.

Die Erhebungen und Vertiefungen auf der Mantelfläche bilden Stützflächen, die überwiegend im wesentlichen parallel zur Gießwalzenachse orientiert und eine radiale Mindesterstreckung aufweisend, einen zusätzlichen Widerstand gegen eine Wanderbewegung des Walzenmantels gegenüber dem Walzenkern in Umfangsrichtung erzeugen. Bei einer stochastischen Verteilung dieser Stützflächen entspricht deren radiale Erstreckung einer definierten Rauigkeit Rz von 2µm. Bei diesen Rauigkeitswerten ist bei Herstellung der Schrumpfverbindung ein optimales Eindringen der Erhebungen in die gegenüberliegende Mantelfläche erzielbar, sodass von den einzelnen Stützflächen eine ausreichend große Gesamtstützfläche einer Mantelverdrehung entgegenwirkt.The elevations and depressions on the lateral surface form support surfaces, which are predominantly oriented substantially parallel to the casting roll axis and having a radial minimum extent, produce an additional resistance to a traveling movement of the roll shell relative to the roll core in the circumferential direction. In a stochastic distribution of these support surfaces whose radial extent corresponds to a defined roughness R z of 2 microns. With these roughness values, an optimum penetration of the elevations into the opposite lateral surface can be achieved when producing the shrink-fit connection, so that a sufficiently large total support surface of a jacket twisting counteracts from the individual support surfaces.

Zur Vermeidung einer Wanderbewegung des Walzenmantels in Richtung der Gießwalzenachse und um eine mittige Zentrierung des Walzenmantels auf dem Walzenkern zu gewährleisten, weist zumindest eine der einander gegenüberliegenden Mantelflächen Erhebungen und Vertiefungen in und unmittelbar um eine achsnormale Gießwalzen-Symmetrieebene weitgehend entlang des gesamten Umfangs einer der beiden Mantelflächen auf, mit einer radialen Erstreckung von mindestens 2 µm, vorzugsweise mindestens 0,2 mm, insbesondere 1 bis 15 mm, die vorzugsweise in Umfangsrichtung orientiert sind. Alternativ bilden diese Erhebungen und Vertiefungen in und unmittelbar um eine achsnormale Gießwalzen-Symmetrieebene an zumindest einer der einander gegenüberliegenden Mantelflächen eine Oberflächenstruktur aus, bei der die Mantelfläche eine Rauigkeit Rz zwischen 2 µm und 1500 µm aufweist.To avoid a traveling movement of the roll shell in the direction of the casting roll axis and to ensure a central centering of the roll shell on the roll core, at least one of the opposite lateral surfaces elevations and depressions in and immediately about an axis normal casting roll symmetry plane substantially along the entire circumference of one of the two On lateral surfaces, with a radial extent of at least 2 microns, preferably at least 0.2 mm, in particular 1 to 15 mm, which are preferably oriented in the circumferential direction. Alternatively, these elevations and depressions in and immediately around an axis-normal casting-roll plane of symmetry form on at least one of the mutually opposite lateral surfaces a surface structure in which the lateral surface has a roughness Rz between 2 μm and 1500 μm.

Dieser Effekt wird in optimaler Weise erreicht, wenn die Erhebungen und Vertiefungen im wesentlichen radial und in Richtung der Gießwalzenachse gerichtete Stützflächen mit einer Längserstreckung ausbilden, die kleiner oder gleich der Mantelflächenlänge sind. Derartig ausgerichtete Stützflächen ergeben sich bei einer beispielsweise mechanischen Bearbeitung der Mantelfläche in Richtung der Gießwalzenachse, wie beispielsweise durch eine Rändelung. Die sich hierbei einstellende annähernd V-förmige Rillenbildung an einer Mantelfläche ergibt eine feste Verbindung mit der weiteren Mantelfläche, wenn der Abstand zwischen den Rillenspitzen vorzugsweise zwischen 0,1 und 1,7 mm und der Abstand zwischen Tal und Spitze zwischen 0,06 und 0,8 liegt.This effect is achieved in an optimum manner when the elevations and recesses substantially in the direction of the casting roll axis and directed radially with support surfaces form a longitudinal extension, which are smaller than or equal to the lateral surface length. Such oriented support surfaces arise in an example mechanical machining of the lateral surface in the direction of the casting roll axis, such as by knurling. The hereby adjusting approximately V-shaped groove formation on a lateral surface results in a firm connection with the further lateral surface, if the distance between the groove tips preferably between 0.1 and 1.7 mm and the distance between valley and tip between 0.06 and 0 , 8 lies.

Weiters hat sich als günstig erwiesen, wenn der Walzenkern und der ringförmige Walzenmantel im Bereich der einander gegenüberliegenden Mantelflächen aus Werkstoffen verschiedener Härte gebildet sind und zumindest die Mantelfläche des die höheren Mantelfläche-Härtewerte aufweisenden Bauteiles mit der vorbestimmten Rauigkeit versehen ist. Während des Aufschrumpfens des Walzenmantels auf dem Walzenkern prägt sich das Rauigkeitsmuster der härteren Mantelfläche in die weichere Mantelfläche ein, wodurch sich ein vollflächiger Mikro-Formschluss ergibt, der dem beim üblichen Schrumpfvorgang erreichbaren Reibungsschluss deutlich überlegen ist. Eine Härtedifferenz zwischen den Randschichten im Bereich der härteren und der weichem Mantelflächen soll mindestens 20%, vorzugsweise aber mehr als 50% betragen, wobei die Härte der weicheren Mantelfläche unter 220 HB, vorzugsweise unter 150 HB liegen soll.Furthermore, it has proven to be advantageous if the roll core and the annular roll shell are formed in the region of the opposite lateral surfaces made of materials of different hardness and at least the lateral surface of the component having the higher lateral surface hardness values is provided with the predetermined roughness. During shrink-fitting of the roll mantle on the roll core, the roughness pattern of the harder mantle surface is impressed into the softer mantle surface, resulting in a full-surface micro-mating fit which is clearly superior to the friction fit achievable in the conventional shrinking process. A hardness difference between the edge layers in the region of the harder and the soft lateral surfaces should be at least 20%, but preferably more than 50%, the hardness of the softer lateral surface should be below 220 HB, preferably below 150 HB.

Gleichermaßen wie bei den beschriebenen Gießwalzen nach dem Stand der Technik hat es sich bewährt, den Walzenkern aus Stahl und den ringförmigen Walzenmantel aus Kupfer oder einer Kupferlegierung herzustellen. Die Ausbildung des Walzenkernes aus Stahl gibt der Gießwalzenkonstruktion die notwendige Betriebsfestigkeit und die Ausbildung des Walzenmantels aus Kupfer oder einer Kupferlegierung ist für eine ausreichende Wärmeabfuhr aus der auf sie aufgebrachten Metallschmelze zwingend notwendig.Similar to the prior art casting rolls described, it has been found useful to manufacture the steel roll core and the annular roll shell from copper or a copper alloy. The formation of the roll core made of steel gives the cast roll construction the necessary operational stability and the formation of the roll mantle of copper or a copper alloy is absolutely necessary for a sufficient heat removal from the molten metal applied to it.

Um unabhängig von den gewählten Materialien für den Walzenkern und den Walzenmantel, sowie anderen Einflüssen, die Schrumpfverbindung in Hinblick auf die bestmögliche Haftverbindung ausbilden zu können, ist zwischen dem Walzenkern und dem Walzenmantel vorzugsweise eine Verbindungsschicht angeordnet und der die Verbindungsschicht bildende Werkstoff auf einer der beiden einander zugeordneten Mantelflächen abgeschieden. Hierbei ist eine der einander zugeordneten Mantelflächen mit der vorbestimmten Rauigkeit bzw. Oberflächenstrukturierung versehen und auf der anderen Mantelfläche ist der die Verbindungsschicht bildende Werkstoff abgeschieden. Vorzugsweise besteht die Verbindungsschicht aus einem Metall oder einer Metalllegierung, wobei in diese Verbindungsschicht verschleißfeste Granulate eingebettet sein können. Diese verschleißfesten Granulate bestehen aus Körnern oder Lamellen von Metalloxiden, wie Aluminiumoxid, Zirkonoxid oder ähnlichen Werkstoffen oder deren Gemenge. Die Granulate können auch aus Körnern oder Lamellen von Karbiden, wie Titankarbid, Wolframkarbid, Siliziumkarbid oder ähnlichen Werkstoffen mit vergleichbaren Eigenschaften oder deren Gemengen bestehen. Auch Mischungen von Metalloxiden und Karbiden sind zweckmäßig. Durch die in eine Grundmatrix eingebetteten hohe Härte aufweisende Karbide und Metalloxide wird die Verhakung zwischen den Mantelflächen zusätzlich verstärkt. Die Verbindungsschicht kann auch von einem sehr harten Material, beispielsweise einer Plasmakeramik gebildet sein, wobei dieses Material so auf eine der Mantelflächen aufgebracht werden muss, dass sich gleichzeitig auch die gewünschte Rauigkeit einstellt. Die Verbindungsschicht weist vorzugsweise eine Schichtdicke von 0,05 bis 1,2 mm auf. Die in sie eingebetteten verschleißfesten Granulate haben eine Korngröße von kleiner als 40 µm, vorzugsweise kleiner als 10µm.In order to be able to form the shrink-fit connection with respect to the best possible adhesive bond independently of the materials chosen for the roll core and the roll shell, as well as other influences, a bonding layer is preferably arranged between the roll core and the roll shell and the material forming the tie-layer on one of the two deposited associated with each other lateral surfaces. Here is one of the mutually associated lateral surfaces provided with the predetermined roughness or surface structuring and on the other lateral surface of the connecting layer forming material is deposited. Preferably, the bonding layer consists of a metal or a metal alloy, wherein wear-resistant granules can be embedded in this bonding layer. These wear-resistant granules consist of grains or lamellae of metal oxides, such as aluminum oxide, zirconium oxide or similar materials or their mixtures. The granules may also consist of grains or fins of carbides, such as titanium carbide, tungsten carbide, silicon carbide or similar materials with comparable properties or their mixtures. Mixtures of metal oxides and carbides are useful. By embedded in a matrix matrix high hardness carbides and metal oxides, the entanglement between the lateral surfaces is further enhanced. The connecting layer can also be formed by a very hard material, for example a plasma ceramic, wherein this material must be applied to one of the lateral surfaces such that the desired roughness also sets at the same time. The bonding layer preferably has a layer thickness of 0.05 to 1.2 mm. The wear-resistant granules embedded in them have a particle size of less than 40 μm, preferably less than 10 μm.

Eine weitere Ausführungsform der erfindungsgemäßen Gießwalze besteht darin, dass der Walzenkern parallel zur Gießwalzenachse an seiner Mantelfläche verteilt Nuten aufweist, in die Sicherungsleisten eingesetzt sind, die die Mantelfläche des Walzenkernes in radialer Richtung um mindestens 2 µm überragen. Die über die Mantelfläche des Walzenkernes vorstehenden Sicherungsleisten drücken sich mit der Schrumpfverbindung in die Mantelfläche des Walzenmantels ein und bilden selbst eine Stützfläche gegen die Mantelverdrehung und erzeugen durch ihre Einprägung in den Walzenmantel eine gegengerichtete Stützfläche in diesem. Vorzugsweise überragen diese Sicherungsleisten die Mantelfläche des Walzenkernes nicht mehr als 1500 µm, da die Möglichkeiten der Einprägung in den Walzenmantel beschränkt ist. Wenn allein durch das Einpressen der Sicherungsleisten in den Walzenmantel ein sattes Aufeinanderliegen der beiden Mantelflächen nicht erreicht werden kann, besteht vorzugsweise auch die Möglichkeit, seichte Einfräsungen mit geringer Tiefe im Walzenmantel an den Stellen vorzunehmen, die den Nuten im Walzenkern gegenüber liegen.Another embodiment of the casting roll according to the invention is that the roll core has grooves distributed parallel to the casting roll axis on its lateral surface, are inserted into the fuse strips, which project beyond the lateral surface of the roll core in the radial direction by at least 2 microns. The over the lateral surface of the roll core protruding fuse strips press with the shrink connection in the lateral surface of the roll shell and form itself a support surface against the jacket twist and produce by their impression in the roll shell a counter-supported support surface in this. Preferably, these securing strips project beyond the lateral surface of the roller core no more than 1500 μm, since the possibilities of embossing in the roller shell are limited. If only by the pressing of the fuse strips in the roll shell a rich juxtaposition of the two lateral surfaces can not be achieved, it is preferably also possible to make shallow milled with shallow depth in the roll shell at the points that are opposite to the grooves in the roll core.

Nach einer weiteren Ausführungsform überragen die Sicherungsleisten die Mantelfläche des Walzenkernes in radialer Richtung zwischen 500 um und 15 mm. Hierbei sind auch in die innere Mantelfläche des Walzenmantels Nuten eingefräst, die den Nuten in der Mantelfläche des Walzenkernes gegenüberliegen und wobei einander gegenüberliegende Nuten jeweils eine Sicherungsleiste aufnehmen. Die Flanken der Sicherungsleiste und die Flanken der Nuten bilden entsprechende in Richtung der Gießwalzenachse orientierte Stützflächen aus. Eine großflächige Schrumpfverbindung zwischen dem Walzenkern und dem Walzenmantel ist dann möglich, wenn die Summentiefe zweier Nuten größer ist als die Höhe der sie aufnehmenden Sicherungsleiste.According to a further embodiment, the securing strips project beyond the lateral surface of the roller core in the radial direction between 500 μm and 15 mm. Here are also in the inner circumferential surface of the roll mantle grooves milled, which lie opposite the grooves in the lateral surface of the roll core and wherein opposing grooves each receive a fuse strip. The flanks of the securing strip and the flanks of the grooves form corresponding support surfaces oriented in the direction of the casting roll axis. A large-area shrinkage connection between the roll core and the roll shell is possible if the sum depth of two grooves is greater than the height of the fuse strip receiving them.

Typische Nutentiefen betragen im Walzenkern 2 bis 15 mm und im Walzenmantel 0,4 bis 5 mm. Die Breite der Sicherungsleiste liegt zwischen 4 und 45 mm, vorzugsweise zwischen 5 und 25 mm. Üblicherweise werden weniger als 16, vorzugsweise weniger als 8 Sicherungsleisten bzw. Nuten auf dem Walzenkern an seinem Umfang vorzugsweise regelmäßig verteilt angeordnet. Mindestens 3 Nuten sind für eine ausreichende Verdrehsicherung des Walzenmantels notwendig, wenn gleichzeitig eine ungleichmäßige Kräfte- und Spannungsverteilung im Walzenmantel vermieden werden soll. Die Länge der Nuten bzw. der Sicherungsleisten ist geringer als die Mantelflächenlänge des Walzenkernes. Damit wird die Gefahr eines Herausgleitens der Sicherungsleisten unter Betriebsbelastung vermieden.Typical groove depths are 2 to 15 mm in the roll core and 0.4 to 5 mm in the roll shell. The width of the fuse strip is between 4 and 45 mm, preferably between 5 and 25 mm. Usually less than 16, preferably less than 8 fuse strips or grooves are preferably distributed regularly distributed on the roll core at its periphery. At least 3 grooves are necessary for a sufficient rotation of the roll shell, if at the same time an uneven forces and stress distribution in the roll shell to be avoided. The length of the grooves or the fuse strips is less than the lateral surface length of the roller core. Thus, the risk of slipping out of the fuse strips is avoided under operating load.

Bei einem Verfahren zur Herstellung einer Gießwalze, die für das Stranggießen von dünnen metallischen Bändern, insbesondere von Stahlbändern, nach dem Zweiwalzen- oder Einwalzengießverfahren geeignet ist und die im wesentlichen aus einem Walzenkern mit einer äußeren Mantelfläche und einem diesen umgebenden, aufgeschrumpften, ringförmigen Walzenmantel mit einer inneren Mantelfläche und einer zentrischen Gießwalzenachse besteht, wird die Mantelfläche des Walzenkernes und die innere Mantelfläche des Walzenmantels für eine Schrumpfverbindung vorbereitet und der Walzenmantel mit einer gegenüber dem Walzenkern erhöhten Temperatur auf dem Walzenkern aufgezogen. Die Erfindung besteht darin, dass auf mindestens einer der einander zugeordneten eine Schrumpfverbindung bildenden Mantelflächen zumindest teilweise in Richtung der Gießwalzenachse orientierte Erhebungen und Vertiefungen mit einer radiale Erstreckung von mindestens 2µm durch mechanische Bearbeitung hergestellt werden und die auf mindestens einer der einander zugeordneten Mantelflächen hergestellten Erhebungen und Vertiefungen eine Oberflächenstruktur ausbilden bei der die Mantelfläche eine Rauigkeit zwischen 2µm und 1500µm aufweist. Anschließend erfolgt eine kontrollierte Abkühlung der Gießwalze auf Raumtemperatur.In a method for producing a casting roll, which is suitable for the continuous casting of thin metallic strips, in particular steel strips, by the two-roll or Einwalzengießverfahren and consisting essentially of a roll core having an outer circumferential surface and a surrounding, shrunk, annular roll shell with an inner circumferential surface and a centric Gießwalzenachse, the lateral surface of the roll core and the inner circumferential surface of the roll shell is prepared for a shrink connection and the roll shell is raised with respect to the roll core elevated temperature on the roll core. The invention consists in that on at least one of the mutually associated jacket surfaces forming a shrink connection at least partially oriented in the direction of the casting roll axis elevations and depressions are produced with a radial extent of at least 2μm by mechanical processing and on at least one of the mating surfaces produced mating surfaces and depressions form a surface structure in which the lateral surface has a roughness between 2 .mu.m and 1500 μ m has. Subsequently, a controlled cooling of the casting roll takes place at room temperature.

Die Vorbereitungen für die Ausbildung einer Schrumpfverbindung bestehen im wesentlichen darin, dass ein auf die Betriebsbedingungen der Gießwalze abgestimmter Passsitz gewählt und der Walzenkern mit einem entsprechenden Außendurchmesser und der Walzenmantel mit einem entsprechenden Innendurchmesser hergestellt wird. Die erfindungswesentliche Maßnahme besteht hierbei in der Ausgestaltung einer der beiden zusammenwirkenden Mantelflächen mit einer Oberflächenstruktur bei der Erhebungen und Vertiefungen Stützflächen bilden, die überwiegend im wesentlichen parallel zur Gießwalzenachse orientiert sind und eine radiale Mindesterstreckung aufweisen, um einen entsprechenden Widerstand gegen eine Wanderbewegung des Walzenmantels in Umfangsrichtung zu gewährleisten. Vorzugsweise wird eine orientierte Oberflächenstruktur in die Mantelfläche eingearbeitet, die eine Rauigkeit Rz zwischen 10µm und 500µm, aufweist. Als besonders günstig hat sich hierbei die Ausbildung einer Oberflächenstruktur erwiesen, bei der die auf mindestens einer der einander zugeordneten Mantelflächen eingearbeiteten Erhebungen und Vertiefungen mit im wesentlichen radial und in Richtung der Gießwalzenachse gerichtete Stützflächen hergestellt werden, die eine Längserstreckung aufweisen, die kleiner oder gleich der Mantelflächenlänge sind.The preparations for the formation of a shrink connection consist essentially in that a matched to the operating conditions of the casting roll fit selected and the roll core is made with a corresponding outer diameter and the roll shell with a corresponding inner diameter. The feature essential to the invention consists in the design of one of the two cooperating lateral surfaces with a surface structure in the elevations and depressions form support surfaces, which are oriented substantially parallel to the casting roll axis and have a radial minimum extent to a corresponding resistance to a migration of the roll shell in the circumferential direction to ensure. Preferably, an oriented surface structure is incorporated in the lateral surface, which has a roughness R z between 10 .mu.m and 500 .mu.m. In this case, the formation of a surface structure has proved to be particularly favorable, in which the elevations and depressions incorporated on at least one of the mutually associated lateral surfaces are produced with support surfaces oriented essentially radially and in the direction of the casting roll axis, which have a longitudinal extension which is less than or equal to Lateral surface length are.

Die in eine der Mantelflächen eingearbeitete orientierte Oberflächenstruktur dringt bei Herstellung der Schrumpfverbindung mit deutlich reduzierter Abplattungstendenz in die Oberfläche der Gegen-Mantelfläche ein, wenn der Walzenkern und der ringförmige Walzenmantel aus Werkstoffen verschiedener Härte hergestellt werden und der mit einem höheren Mantelfläche-Härtewert ausgebildete Bauteil mit der vorbestimmten Rauigkeit Rz versehen wird. Die Härtewerte des mit einem höheren Mantelfläche-Härtewert ausgebildeten Bauteils kann zusätzlich durch eine Härtung, Nitrierung, Aufkohlung oder einem vergleichbaren Verfahren erhöht werden. Damit kann auf die Haftverbindung verbessernde zusätzliche Beschichtung auf einer der einander zugeordneten Mantelflächen weitgehend verzichtet werden.The incorporated in one of the lateral surfaces oriented surface structure penetrates when producing the shrink connection with significantly reduced Abplattungstendenz in the surface of the mantle surface when the roll core and the annular roll shell are made of materials of different hardness and formed with a higher lateral surface hardness value component with the predetermined roughness R z is provided. The hardness values of the component formed with a higher lateral surface hardness value can additionally be increased by hardening, nitriding, carburizing or a comparable method. This can be largely dispensed with adhesion-improving additional coating on one of the mating lateral surfaces.

Die gerichtete Oberflächenstruktur bzw. die Rauhigkeit Rz wird in einfacher Weise durch mechanische Bearbeitung der Manteloberfläche, wie Rändeln, Stoßen oder Fräsen hergestellt. Insbesondere bei Stoß- oder Fräsbearbeitung in Richtung der Gießwalzenachse ist in einfacher Weise eine entsprechend gerichtete Oberflächenstruktur mit vorbestimmter Rauigkeit herstellbar, die überwiegend in Richtung der Gießwalzenachse orientierte und einer Mantelverdrehung entgegenwirkende Stützflächen aufweist.The directional surface structure or the roughness Rz is produced in a simple manner by mechanical processing of the mantle surface, such as knurling, bumping or milling. In particular, in the case of impact or milling machining in the direction of the casting roll axis, a correspondingly directed surface structure having a predetermined roughness can be produced in a simple manner, which is predominantly in the direction the casting roll axis oriented and a jacket twist counteracting support surfaces.

Die Haftverbindung zwischen dem Walzenkern und dem Walzenmantel können zusätzlich verbessert werden, wenn auf einer der einander zugeordneten Mantelflächen eine Verbindungsschicht abgeschieden wird, wobei vorteilhaft auf einer Mantelfläche die vorbestimmte Rauigkeit aufgebracht wird und auf der anderen Mantelfläche die Verbindungsschicht in einer Schichtdicke von 0,05 bis 1,2 mm abgeschieden wird. Die Verbindungsschicht aus einem Metall oder einer Metalllegierung wird bevorzugt durch elektrolytische Abscheidung oder durch Plasmaabscheidung auf der Mantelfläche aufgebracht. Zusätzlich können die bereits zuvor beschriebenen Granulate in die Verbindungsschicht eingelagert werden.The bonding between the roll core and the roll shell can be further improved if a bonding layer is deposited on one of the mating surfaces, wherein the predetermined roughness is advantageously applied to one lateral surface and the bonding layer is applied in a layer thickness of 0.05 to 1.2 mm is deposited. The compound layer of a metal or a metal alloy is preferably applied by electrodeposition or by plasma deposition on the lateral surface. In addition, the granules already described above can be incorporated into the bonding layer.

Eine Variante des beschriebenen Verfahrens zur Herstellung einer Gießwalze mit einer entsprechend stabilen Verdrehsicherung zwischen Walzenkern und Walzenmantel wird hergestellt, indem die Mantelfläche des Walzenkernes und die innere Mantelfläche des Walzenmantels für eine Schrumpfverbindung vorbereitet werden,dass auf der Mantelfläche des Walzenkernes parallel zur Gießwalzenachse Nuten eingearbeitet und in diese Sicherungsleisten eingesetzt werden, die die Mantelfläche des Walzenkernes in radialer Richtung mindestens 2µm überragt, vorzugsweise zwischen 500 µm und 15 mm überragen,
und dass der Walzenmantel mit einer gegenüber dem Walzenkern erhöhten Temperatur auf dem Walzenkern aufgezogen wird, wobei zwischen den Sicherungsleisten und dem Walzenmantel eine Schrumpfverbindung und zwischen dem Walzenkern und dem Walzenmantel zumindest eine dichte Verbindung hergestellt wird. Anschließend erfolgt eine kontrollierte Abkühlung der Gießwalze auf Raumtemperatur.A variant of the described method for producing a casting roll with a correspondingly stable rotation between the roll core and roll shell is prepared by the lateral surface of the roll core and the inner surface of the roll shell are prepared for a shrink connection, that incorporated on the lateral surface of the roll core parallel to the casting roll axis grooves and be used in these fuse strips, which projects beyond the lateral surface of the roll core in the radial direction at least 2μm, preferably projecting from 500 microns to 15 mm,
and that the roll jacket is mounted on the roll core with a temperature which is higher than that of the roll core, wherein a shrink connection is produced between the fuse bars and the roll shell and at least one tight connection between the roll core and the roll shell. Subsequently, a controlled cooling of the casting roll takes place at room temperature.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beiliegenden Figuren Bezug genommen wird, die folgendes zeigen:

Fig. 1
eine Gießwalze im Teilschnitt mit einer erfindungsgemäßen Ausbildung der Mantelfläche des Walzenkernes nach einer ersten Ausführungsform,
Fig. 2
eine Gießwalze im Querschnitt mit einer erfindungsgemäßen Ausbildung der Mantelflächen nach einer zweiten Ausführungsform,
Fig. 3
die in Fig. 2 verwendeten Sicherungsleisten in einem Schrägriss.
Further advantages and features of the invention will become apparent from the following description of non-limiting embodiments, reference being made to the attached figures, which show the following:
Fig. 1
a casting roll in partial section with an inventive design of the lateral surface of the roll core according to a first embodiment,
Fig. 2
a casting roll in cross-section with an inventive design of the lateral surfaces according to a second embodiment,
Fig. 3
the fuse strips used in Fig. 2 in a Schrägriss.

In Fig. 1 ist eine erfindungsgemäße Gießwalze für das Stranggießen von Stahlbändern in einer Zweiwalzen-Stranggießanlagen schematisch in einemTeilschnitt dargestellt. Sie besteht aus einem Walzenkern 1 aus Stahl, der in Walzenzapfen 1 a, 1 b zur Abstützung in nicht dargestellten Gießwalzenlagern endet. Ein zylindrischer Walzenmantel 2 aus einer Kupferlegierung umgibt den Walzenkern 1 und ist mit einer Schrumpfverbindung 3 drehfest auf diesem befestigt. Die Schrumpfverbindung 3 wird von der äußeren Mantelfläche 4 des Walzenkernes 2 und der inneren Mantelfläche 5 des Walzenmantels 2 gebildet, wobei die beiden Mantelflächen 4 und 5 durch eine gerichtete Oberflächenstruktur einen gegenüber gängigen Schrumpfverbindungen erhöhten Verdrehwiderstand erzielt. Beispielhaft in Fig. 1 dargestellt, ist die Mantelfläche 4 mit einer Rändelung 6 ausgestattet, wobei die durch die Rändelung erzeugten Nuten 7 in Richtung der Gießwalzenachse 8 orientiert sind und V-förmige im wesentlichen radial und in Richtung der Gießwalzenachse 8 erstreckte Stützflächen 9 bilden, die in großer Zahl als Widerstandsflächen gegen ein relatives Verdrehen des Walzenmantels 2 zum Walzenkern 1 wirken. Auf der inneren Mantelfläche 5 des Walzenmantels 2 ist eine metallische Verbindungsschicht 10 beispielsweise elektrolytisch abgeschieden und bildet ein verhältnismäßig weiche, geringe Härte aufweisende Schicht, in die die strukturierte äußere Mantelfläche 4 des Walzenkernes 1 bei der Herstellung der Schrumpfverbindung, ohne seine Struktur wesentlich zu verändern, eindringt. In die Verbindungsschicht können zusätzlich von verschiedenen Metalloxiden oder Karbiden gebildete Granulate eingebettet sein, die die Haftwirkung zusätzlich erhöhen.
Die Gießwalze ist mit einer inneren zirkulierenden Flüssigkeitskühlung versehen, wobei Kühlflüssigkeit über eine zentrale Zuleitung 11 und radialen Stichleitungen 12 zu ringförmigen in die äußere Mantelfläche 4 des Walzenkern 1 eingefrästen Kühlmittelkanälen 13 zugeleitet und über weitere radiale Stichleitungen 14 und eine zentrale Ableitung 15 wieder abgeleitet wird. Mit dem durch die eingefrästen Kühlmittelkanäle 13 zirkulierende Kühlmittel wird der auf die Gießwalzenoberfläche 16 aufgebrachten Stahlschmelze Wärme entzogen und durch den Walzenmantel 2 in das Kühlmittel abgeführt.In Fig. 1, a casting roll according to the invention for the continuous casting of steel strips in a two-roll continuous casting is shown schematically in a partial section. It consists of a roller core 1 made of steel, which ends in roll neck 1 a, 1 b for support in Gießwalzenlagern not shown. A cylindrical roll shell 2 made of a copper alloy surrounds the roll core 1 and is fixed in rotation therewith by means of a shrink connection 3. The shrink joint 3 is formed by the outer circumferential surface 4 of the roll core 2 and the inner circumferential surface 5 of the roll shell 2, wherein the two lateral surfaces 4 and 5 achieved by a directed surface structure increased compared to conventional shrink joints torsional resistance. Illustrated by way of example in FIG. 1, the lateral surface 4 is provided with a knurling 6, wherein the grooves 7 produced by the knurling are oriented in the direction of the casting roll axis 8 and form V-shaped support surfaces 9 extending substantially radially and in the direction of the casting roll axis 8, which act in large numbers as resistance surfaces against a relative rotation of the roll shell 2 to the roll core 1. On the inner circumferential surface 5 of the roll shell 2, a metallic compound layer 10 is, for example, deposited electrolytically and forms a relatively soft, low hardness layer, in which the structured outer surface 4 of the roll core 1 in the manufacture of the shrink joint, without significantly altering its structure, penetrates. In addition, granules formed by different metal oxides or carbides which additionally increase the adhesive effect can be embedded in the bonding layer.
The casting roll is provided with an internal circulating liquid cooling, wherein cooling liquid is supplied via a central supply line 11 and radial branch lines 12 to annular milled into the outer circumferential surface 4 of the roll core 1 coolant channels 13 and discharged via further radial stubs 14 and a central discharge line 15 again. With the coolant circulating through the milled-coolant channels 13, the heat applied to the casting roll surface 16 steel melt heat is removed and discharged through the roll shell 2 into the coolant.

In Fig. 2 ist die Gießwalze mit einer erfindungsgemäßen Schrumpfverbindung 3 nach einer weiteren Ausführungsform in einem Querschnitt dargestellt. Der Walzenkern 1 ist analog wie in Fig. 1 mit einem Kühlmittelkreislauf ausgestattet, der aus einer zentralen Zuleitung 11, radialen Stichleitungen 12, radialen Stichleitungen 14 und einer zentralen Ableitung 15 ausgestattet. Die ringförmigen Kühlmittelkanäle 13 sind bei der in Fig. 2 dargestellten Ausführungsform in den Walzenmantel 2 gedreht. Parallel zur Gießwalzenachse 8 sind vier Nuten 7 in die äußere Mantelfläche 4 des Walzenkerns 1 eingefräst und in jede dieser Nuten 7 ist eine Sicherungsleiste 17 eingesetzt, die die äußere Mantelfläche 4 des Walzenkerns 1 um ein kleines Stück überragt. Gleichermaßen sind in die innere Mantelfläche 5 des Walzenmantels 2 Nuten 18 geringer Tiefe eingefräst, die den Nuten 7 im Walzenkern 1 gegenüber liegen und gemeinsam die Sicherungsleisten 17 aufnehmen. Die seitlichen Flanken 19, 20 der Sicherungsleisten 17 und die seitlichen Flanken 21, 22 der in die Umfangskühlrippen gefrästen Nuten 7, 18 im Walzenkern 1 und im Walzenmantel 2 (im Bereich der in Umfangsrichtung verlaufenden Kühlrippen 24) wirken hierbei als Stützflächen gegen die Mantelverdrehung.In Fig. 2, the casting roll is shown with a shrinkage connection 3 according to the invention according to a further embodiment in a cross section. The roller core 1 is analogous as in Fig. 1 equipped with a coolant circuit, which consists of a central supply line 11, radial stub lines 12, radial stub lines 14 and a central discharge line 15. The annular coolant channels 13 are rotated in the roll shell 2 in the embodiment shown in FIG. Parallel to the casting roll axis 8 four grooves 7 are milled into the outer circumferential surface 4 of the roll core 1 and in each of these grooves 7 a fuse strip 17 is inserted, which projects beyond the outer surface 4 of the roll core 1 by a small piece. Similarly, 2 grooves 18 shallow depth are milled into the inner circumferential surface 5 of the roll shell, which lie opposite the grooves 7 in the roll core 1 and collect the fuse strips 17 together. The lateral flanks 19, 20 of the securing strips 17 and the lateral flanks 21, 22 of the grooves 7, 18 milled in the circumferential cooling ribs in the roll core 1 and in the roll shell 2 (in the region of the cooling fins 24 extending in the circumferential direction) act as support surfaces against the jacket twisting.

Die Sicherungsleiste 17 ist in Fig. 3 in einem Schrägriss dargestellt. die Sicherungsleiste 17 enthält Ausnehmungen 23 für die ungestörte Kühlmitteldurchführung, wobei diese Ausnehmungen 23 in eingebauter Lage der Sicherungsleiste mit den ringförmigen Kühlmittelkanälen 13 fluchten. Im Abstand nebeneinander angeordnete Ausnehmungen 23 werden zur Gewährleistung einer gleichmäßigen Walzenmantelkühlung jeweils bevorzugt in entgegegesetzter Richtung durchströmt. Dies ist durch Pfeile angedeutet.The fuse strip 17 is shown in Fig. 3 in an oblique view. the fuse strip 17 contains recesses 23 for the undisturbed coolant bushing, these recesses 23 are aligned in the installed position of the fuse strip with the annular coolant channels 13. At a distance juxtaposed recesses 23 are each preferably flowed through in the opposite direction to ensure uniform roll jacket cooling. This is indicated by arrows.

Der Schutzumfang des Gießwalze beschränkt sich nicht auf die detailliert dargestellten Ausführungsformen, sondern umfasst insbesondere auch Gießwalzen mit einem Walzenmantel, mit im wesentlichen mittig liegenden axialen Kühlbohrungen, sowie Gießwalzen mit in den Walzenkern oder den Walzenmantel eingearbeiteten trapezgewindeartigen Kühlkanälen, oder auf Gießwalzen mit in den Walzenkern eingearbeiteten Umfangskühlrippen.The scope of protection of the casting roll is not limited to the embodiments shown in detail, but also includes casting rolls with a roll shell, with substantially central axial cooling holes, and casting rolls with incorporated into the roll core or the roll shell trapezoidal thread-like cooling channels, or on casting rolls in the roll core incorporated circumferential cooling ribs.

Claims (33)

  1. Casting roll for the continuous casting of thin metallic strips, in particular of steel strips, in a two-roll or one-roll casting installation, having a roll core (1) with an outer lateral surface (4) and an annular roll shell (2) which surrounds the roll core, is shrunk on and has an inner lateral surface (5) and having a central casting-roll axis (8), characterized in that at least one of the lateral surfaces (4, 5) which lie opposite one another and form a shrink connection has elevations and depressions in the lateral surface, at least some of which are oriented in the direction of the casting-roll axis (8) and the radial extent of which is at least 2 µm, and in that the elevations and depressions form a surface structure on at least one of the lateral surfaces (4, 5) which lie opposite one another, in which surface structure the lateral surface has a roughness (Rz) of between 2 µm and 1500 µm.
  2. Casting roll according to Claim 1, characterized in that at least one of the lateral surfaces which lie opposite one another has a roughness (Rz) of between 10 µm and 500 µm .
  3. Casting roll according to one of the preceding claims, characterized in that at least one of the lateral surfaces (4, 5) which lie opposite one another has elevations and depressions in and directly around a casting-roll plane of symmetry which is normal to the axis, substantially along the entire circumference of one of the lateral surfaces (4, 5), with a radial extent of at least 2 µm, which are preferably oriented in the circumferential direction.
  4. Casting roll according to Claim 4, characterized in that the elevations and depressions in and around the casting-roll plane of symmetry which is normal to the axis, on at least one of the lateral surfaces (4, 5) which lie opposite one another, form a surface structure in which the lateral surface has a roughness (Rz) of between 2 µm and 1500 µm.
  5. Casting roll according to one of the preceding claims, characterized in that the elevations and depressions form supporting surfaces (9) which are directed substantially radially and in the direction of the casting-roll axis (8) and have a longitudinal extent less than or equal to the lateral-surface length (L).
  6. Casting roll according to one of the preceding claims, characterized in that the roll core (1) and the annular roll shell (2), in the region of the lateral surfaces (4, 5) which lie opposite one another, are formed from materials of different hardness, and at least the lateral surface of the component which has the higher lateral surface hardness is provided with the predetermined roughness (Rz).
  7. Casting roll according to one of the preceding claims, characterized in that the roll core (1) consists of steel and the annular roll shell (2) consists of Cu or a Cu alloy.
  8. Casting roll according to one of the preceding claims, characterized in that a joining layer (10) is arranged between the roll core (1) and the roll shell (2), and in that the material which forms the joining layer (10) is deposited on one of the two mutually associated lateral surfaces (4, 5).
  9. Casting roll according to Claim 6, characterized in that one of the mutually associated lateral surfaces (4 or 5) is provided with the predetermined roughness (Rz), and the material which forms the joining layer (10) is deposited on the other lateral surface.
  10. Casting roll according to one of Claims 8 or 9, characterized in that the joining layer (10) is formed by a metal or a metal alloy.
  11. Casting roll according to one of Claims 8 to 10, characterized in that wear-resistant granules are embedded in the joining layer (10).
  12. Casting roll according to Claim 11, characterized in that the wear-resistant granules consist of metal oxides, such as aluminium oxide, zirconium oxide or similar materials.
  13. Casting roll according to Claim 11, characterized in that the wear-resistant granules are formed by carbide grains or platelets, such as titanium carbide, tungsten carbide, silicon carbide or similar materials.
  14. Casting roll according to Claim 12 or 13, characterized in that the grain size of the wear-resistant granules is less than 40 µm, preferably less than 10 µm.
  15. Casting roll according to one of the preceding claims, characterized in that the roll core (1), parallel to the casting-roll axis (8), has grooves (7) distributed over its lateral surface (4), into which grooves securing bars (17) are fitted, which project between 2 µm and 1500 µm above the lateral surface (4) of the roll core (1) in the radial direction and are stamped into the lateral surface (5) of the roll shell (2).
  16. Casting roll according to one of Claims 1 to 14, characterized in that the roll core (1), parallel to the casting-roll axis (8), has grooves (7) distributed over its lateral surface (4), into which grooves securing bars (17) are fitted, which project between 500 µm and 15 mm above the lateral surface (4) of the roll core (1) in the radial direction, and in that the inner lateral surface (5) of the roll shell (2) includes grooves (18) which lie opposite the grooves (7) in the lateral surface (4) of the roll core (1), and grooves (7, 18) which lie opposite one another accommodate in each case one securing bar (17), the sum of the depth of the opposite grooves (7, 18) being greater than the height of the securing bar (17) which they accommodate
  17. Casting roll according to Claim 15 or 16, characterized in that fewer than 16, preferably fewer than eight securing bars (17) and grooves (7) are distributed over the roll core (1).
  18. Casting roll according to one of Claims 15 to 17, characterized in that the length of the grooves (7) and of the securing bars (17) is shorter than the lateral-surface length (L) of the roll core (1).
  19. Process for producing a casting roll for the continuous casting of thin metallic strips, in particular of steel strips, using the two-roll or one-roll casting process, which casting roll has a roll core (1) with an outer lateral surface (4), and an annular roll shell (2) which surrounds the roll core, has been shrunk on and has an inner lateral surface (5) and a central casting-roll axis (8), the lateral surface (4) of the roll core (1) and the inner lateral surface (5) of the roll shell (2) being prepared for joining by shrink-fitting and the roll shell (2) being drawn onto the roll core (1) at a temperature which is higher than that of the roll core (1), characterized in that elevations and depressions, at least some of which are oriented in the direction of the casting-roll axis (8) and the radial extent of which is at least 2 µm, are produced by machining on at least one of the mutually associated lateral surfaces (4, 5) which form a shrink connection, and the elevations and depressions which are produced on at least one of the mutually associated lateral surfaces (4, 5) form a surface structure in which the lateral surface has a roughness (Rz) of between 2 µm and 1500 µm.
  20. Process according to Claim 19, characterized in that the elevations and depressions which are formed on at least one of the mutually associated lateral surfaces (4, 5) form a surface structure in which the lateral surface has a roughness (Rz) of between 10 µm and 500 µm.
  21. Process according to Claim 19 or 20, characterized in that the elevations and depressions which are formed on at least one of the mutually associated lateral surfaces (4, 5) are produced with supporting surfaces (9) which are directed substantially radially and in the direction of the casting-roll axis (8) and have a longitudinal extent less than or equal to the lateral-surface length (L).
  22. Process according to one of Claims 19 to 21, characterized in that the roll core (1) and the annular roll shell (2) are produced from materials of different hardness, and the component which is formed with the higher lateral-surface hardness is provided with the predetermined roughness (Rz).
  23. Process according to Claim 22, characterized in that the roughness (Rz) is applied by knurling, forging or milling.
  24. Process according to one of Claims 19 to 23, characterized in that the roll core (1) is produced from steel and the annular roll shell (2) is produced from Cu or a Cu alloy.
  25. Process according to one of Claims 19 to 21, characterized in that a joining layer (10) is deposited on one of the mutually associated lateral surfaces (4, 5) .
  26. Process according to one of Claims 19 to 25, characterized in that a predetermined roughness (Rz) is applied to one of the mutually associated lateral surfaces (4, 5), and a joining layer (10) is deposited on the other lateral surface.
  27. Process according to one of Claims 25 and 26, characterized in that the joining layer (10) is produced by electrodeposition.
  28. Process according to one of Claims 25 and 26, characterized in that the joining layer (10) is formed by plasma deposition.
  29. Process according to one of Claims 25 to 28, characterized in that the joining layer (10) is formed from a metal or a metal alloy.
  30. Process according to one of Claims 25 to 29, characterized in that wear-resistant granules are incorporated in the joining layer (10).
  31. Process according to Claim 30, characterized in that metal oxides, such as aluminium oxide, zirconium oxide and similar materials, are incorporated in the joining layer (10) as wear-resistant granules.
  32. Process according to Claim 30, characterized in that carbide grains or carbide platelets, such as titanium carbide, tungsten carbide, silicon carbide or similar materials, are incorporated in the joining layer (10) as wear-resistant granules.
  33. Process according to Claim 31 or 32, characterized in that wear-resistant granules with a grain size of less than 40 µm, preferably less than 10 µm, are incorporated in the joining layer (10).
EP02793061A 2002-01-11 2002-12-18 Casting roll and a method for producing a casting roll Expired - Lifetime EP1476262B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT02793061T ATE331578T1 (en) 2002-01-11 2002-12-18 CASTING ROLL AND METHOD FOR PRODUCING A CASTING ROLL

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT472002 2002-01-11
AT0004702A AT411337B (en) 2002-01-11 2002-01-11 CASTING ROLL FOR THE CASTING OF THIN METALLIC TAPES
PCT/EP2002/014468 WO2003057390A2 (en) 2002-01-11 2002-12-18 Casting roll and a method for producing a casting roll

Publications (2)

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EP1476262A2 EP1476262A2 (en) 2004-11-17
EP1476262B1 true EP1476262B1 (en) 2006-06-28

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US (1) US7281567B2 (en)
EP (1) EP1476262B1 (en)
KR (1) KR20040066207A (en)
CN (1) CN1304142C (en)
AT (2) AT411337B (en)
AU (1) AU2002358749B2 (en)
DE (1) DE50207410D1 (en)
MX (1) MXPA04006734A (en)
WO (1) WO2003057390A2 (en)

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DE102011055066A1 (en) 2011-11-04 2013-05-08 Hydro Aluminium Rolled Products Gmbh Roller with cooling system

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EP2473298B2 (en) * 2009-09-04 2018-10-31 Georg Springmann Industrie- und Bergbautechnik GMBH Roller and roller assembly for a continuous casting device
KR101662230B1 (en) 2010-03-26 2016-10-05 삼성전자주식회사 Reflective structure, display apparatus comprising reflective structure and methods of manufacturing reflective structure and display apparatus
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EP2589446A2 (en) 2011-11-04 2013-05-08 Hydro Aluminium Rolled Products GmbH Roller with cooling system

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AU2002358749B2 (en) 2008-04-10
ATA472002A (en) 2003-05-15
DE50207410D1 (en) 2006-08-10
MXPA04006734A (en) 2004-11-10
CN1304142C (en) 2007-03-14
US20050039875A1 (en) 2005-02-24
CN1615193A (en) 2005-05-11
AU2002358749A1 (en) 2003-07-24
WO2003057390A2 (en) 2003-07-17
ATE331578T1 (en) 2006-07-15
WO2003057390A3 (en) 2003-12-18
KR20040066207A (en) 2004-07-23
AT411337B (en) 2003-12-29
US7281567B2 (en) 2007-10-16
EP1476262A2 (en) 2004-11-17

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