EP1855824B1 - Method for producing a continuous casting mold and corresponding continuous casting mold - Google Patents

Method for producing a continuous casting mold and corresponding continuous casting mold Download PDF

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Publication number
EP1855824B1
EP1855824B1 EP06723315.5A EP06723315A EP1855824B1 EP 1855824 B1 EP1855824 B1 EP 1855824B1 EP 06723315 A EP06723315 A EP 06723315A EP 1855824 B1 EP1855824 B1 EP 1855824B1
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Prior art keywords
casting
mold
continuous casting
waves
casting direction
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EP06723315.5A
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German (de)
French (fr)
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EP1855824A1 (en
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Gereon Fehlemann
Albrecht Girgensohn
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SMS Group GmbH
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SMS Group GmbH
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Priority claimed from DE102005023745.2A external-priority patent/DE102005023745B4/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
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process

Definitions

  • the invention relates to a method for producing a continuous casting mold in which at least one surface is mechanically processed which, when the mold is used as intended, is in contact with molten material.
  • the invention also relates to a continuous casting mold.
  • Continuous casting molds which are characterized by a special surface design in order, in particular, to influence the heat transfer from the steel into the mold wall in a favorable manner.
  • the EP 1 099 496 A1 provides for mold plates to be completely or partially provided with a surface texture in order to reduce the heat flow.
  • the texture is preferably produced by sandblasting or shot peening after the mechanical processing. This makes it possible to increase the roughness of that surface of the mold which, when the continuous casting mold is used as intended, is in contact with molten material.
  • JP 10 193 042 A a continuous casting mold is described, wherein longitudinal grooves are deliberately introduced into the surface of the broadside plates. The aim of this is to reduce the heat flow density in the meniscus in order to avoid longitudinal cracks.
  • a continuous casting mold is known in which a reduction in the heat flow density is sought, namely in the upper region of the mold. This is achieved by increasing the wall thickness of the mold in its upper area or by using more insulating material in this area.
  • the upper part of the mold can either consist entirely of this material or be coated with this material on the water side.
  • the FR 2 658 440 describes a continuous casting mold in which a local reduction in the heat flux density is achieved by making grooves in the hot side of the mold and filling these grooves with a second material with low thermal conductivity. In addition, the entire surface of the mold is coated with this second material.
  • JP 06 134 553 A and in the JP 03 128 149 A describes the roughening of the surface of casting rollers, which is intended to reduce the heat flux density in this application.
  • EP-A-1 099 496 A1 a method for producing a continuous casting mold according to the preamble of claim 1 and such a continuous casting mold according to the preamble of claim 2 are known.
  • a continuous casting mold for casting strands of metal the casting cross-section of which is delimited by plates made of copper alloys, which form broad-side plates or narrow-side plates, with a surface that is arranged at least in the bath mirror area on the hot side and formed against wear and heat, and at least in the broad side plates in the bath mirror area a recessed, strip-shaped mold section is provided, and the recessed surface is given a greater surface roughness by a blasting process, is off DE-A 102 56 751 known.
  • the thickness and the structure of the casting powder layer between the mold wall and the strand shell largely determine the level of heat flow density between the steel and the mold and thus the thermal load on both the strand shell and the mold material. Due to local and temporal changes in the casting powder layer, especially in the area of the casting level, strong stresses can arise in the strand shell, which lead to longitudinal cracks, especially in the case of steel types that are sensitive to cracks. However, the surface of the mold is also exposed to strong mechanical loads as a result of changing thermal loads. Therefore, the maximum heat flow in the area of the meniscus should be low and as uniform as possible in order to reduce the risk of cracking, especially in the case of steel types that are sensitive to longitudinal cracks.
  • the aim is that the friction between the broad sides and the narrow sides of the mold is as low as possible during the narrow side adjustment.
  • the aim is to reduce the thermal load in the meniscus through a low heat flux density, which should have a positive effect on the life of the mold.
  • the invention is therefore based on the object of creating a method for producing a continuous casting mold and a continuous casting mold with which the stated desired properties are achieved as well as possible, this being achieved with the least possible manufacturing effort and thus with low costs.
  • the solution to this problem by the invention is characterized according to the method that as the last work step in the production of the surface of Mold a mechanical processing is carried out, which generates an anisotropically structured surface, in such a way that the surface of the mold has a greater roughness in the casting direction than in the direction transverse to the casting direction and has elevations and depressions formed in lines and oriented transversely to the casting direction
  • the last step is a milling process.
  • Anisotropy is understood to mean that surface characteristics change depending on the surface direction in which they are determined. In the case of the surface of the mold in question here, this means in particular that parameters such as B. measured roughness in the casting direction have different values than perpendicular to it, d. H. in the transverse direction to the casting direction.
  • the continuous casting mold which has at least one mechanically processed surface which, when used as intended, is in contact with molten material, is characterized according to the invention in that the surface at least partially has an anisotropic structure such that the surface of the mold has a greater roughness in the casting direction than in the direction transverse to the casting direction, and that the surface has elevations and depressions which are linearly designed and oriented and which run in the direction transverse to the casting direction, the elevations and depressions being designed as waves whose wave crests and troughs extend in the direction transverse to the casting direction, the height of the waves is between 2 ⁇ m and 250 ⁇ m.
  • the anisotropically structured surface has line-shaped and oriented elevations and depressions which run in the direction transverse to the casting direction, these elevations and depressions are designed as waves, the wave crests and troughs of which extend in the direction transverse to the casting direction (G); the shafts preferably have a substantially rounded shape in cross section. It has proven useful if the height of the waves is between 2 ⁇ m and 250 ⁇ m, in particular between 10 ⁇ m and 50 ⁇ m.
  • the height of the waves on the surface can remain constant in the casting direction and / or transversely to the casting direction or can be set variably.
  • the proposal of the invention is therefore based on the fact that the desired anisotropic surface structure is produced in the last step of the shaping, mechanical processing of the mold surface.
  • the machined surface is advantageously designed in such a way that it is different in the casting direction macroscopic structure is generated as being transverse to the casting direction. Equally, the microscopic roughness of the surface can also be designed differently in the casting direction and across it.
  • both the increased roughness and the macroscopic structure of the surface lead to a reduction and equalization of the heat flow, which also leads to a reduction in the tendency towards longitudinal cracks.
  • the thermal load on the mold plate is also reduced, which results in a longer service life of the mold plates.
  • the desired surface structure is created during the mechanical, machining of the mold surface.
  • further processing steps such as B. the introduction of grooves in the surface, the coating of the surface in the meniscus area or the roughening of the surface by sand or shot peening, are not required, which makes the inventive proposal economical.
  • the advantageous anisotropic surface structure can be produced without great effort not only during the production of the molds, but also each time the mold surface is reworked, which has to take place at certain time intervals.
  • molds that consist of individual mold plates (e.g. slab, thin slab) additionally the friction between wide and narrow sides when adjusting the narrow sides is also reduced.
  • Fig. 1 the view of that surface of a mold plate of a continuous casting mold 1 is shown which, when the continuous casting mold 1 is in use, is in contact with molten material (steel) or the solidified strand shell.
  • the strand shell passes the mold plate in the casting direction G.
  • the surface 2 is provided with a special structure:
  • the surface topology, in particular the roughness, of the surface 2 is anisotropic, ie it results in the casting direction G and different roughness values in direction Q transverse to casting direction G.
  • the mold plate is provided with a large number of elevations and depressions, which in Fig. 1 are only shown very schematically.
  • the production of these elevations and depressions takes place during the last mechanical processing operation in the production of the mold plate.
  • the surface of the mold plate is milled using the line milling process.
  • z. B. used a milling tool with a diameter of 100 to 150 mm, which with conventional indexable inserts, z. B. made of hard metal is provided.
  • the material consumption in the last processing step is lower than 1 mm, preferably less than 0.5 mm.
  • the characteristics and structure of the elevations and depressions on the mold surface can be specifically set.
  • Fig. 2 shows the profile of the finished surface in three-dimensional view. It can be seen here that the roughness of the surface in the casting direction G is greater than that transversely to the casting direction Q.
  • the mold plate is thus provided with a large number of elevations and depressions, which are shown in FIG Fig. 1 are only shown very schematically. The production of these elevations and depressions takes place during the last mechanical processing operation in the production of the mold plate.
  • the height H of the line-shaped oriented elevations and depressions is in Fig. 3 can be seen and is typically in the range from 2 ⁇ m to 250 ⁇ m, which can be influenced by the choice of milling parameters.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Stranggießkokille, bei der zumindest eine Oberfläche mechanisch bearbeitet wird, die bei der bestimmungsgemäßen Benutzung der Kokille Kontakt mit schmelzflüssigem Material hat. Des Weiteren betrifft die Erfindung eine Stranggießkokille.The invention relates to a method for producing a continuous casting mold in which at least one surface is mechanically processed which, when the mold is used as intended, is in contact with molten material. The invention also relates to a continuous casting mold.

Es sind Stranggießkokillen bekannt, die sich durch eine spezielle Oberflächenausgestaltung auszeichnen, um insbesondere den Wärmeübergang vom Stahl in die Kokillenwand in einer günstigen Weise zu beeinflussen.Continuous casting molds are known which are characterized by a special surface design in order, in particular, to influence the heat transfer from the steel into the mold wall in a favorable manner.

Die EP 1 099 496 A1 sieht vor, zur Reduzierung des Wärmestroms Kokillenplatten ganz oder teilweise mit einer Oberflächentextur zu versehen. Die Textur wird dabei im Anschluss an die mechanische Bearbeitung vorzugsweise durch Sand- oder Kugelstrahlen erzeugt. Hierdurch kann die Rauheit derjenigen Oberfläche der Kokille erhöht werden, die bei bestimmungsgemäßem Gebrauch der Stranggießkokille Kontakt zu schmelzflüssigem Material hat.The EP 1 099 496 A1 provides for mold plates to be completely or partially provided with a surface texture in order to reduce the heat flow. The texture is preferably produced by sandblasting or shot peening after the mechanical processing. This makes it possible to increase the roughness of that surface of the mold which, when the continuous casting mold is used as intended, is in contact with molten material.

In der JP 10 193 042 A ist eine Stranggießkokille beschrieben, wobei in die Oberfläche der Breitseitenplatten gezielt Längsnuten eingebracht sind. Hierdurch soll erreicht werden, dass die Wärmestromdichte im Gießspiegel reduziert wird, um Längsrisse zu vermeiden.In the JP 10 193 042 A a continuous casting mold is described, wherein longitudinal grooves are deliberately introduced into the surface of the broadside plates. The aim of this is to reduce the heat flow density in the meniscus in order to avoid longitudinal cracks.

Aus der JP 02 020 645 A geht eine Stranggießkokille hervor, bei der Längsnuten und Quernuten in einem vorgegebenen Raster in die Breitseitenplatten eingebracht sind. Hierdurch wird ebenfalls angestrebt, dass die Wärmestromdichte im Gießspiegel reduziert und so die Gefahr von Längsrissen vermindert wird. Die eingebrachten Nuten liegen im Bereich von 0,5 bis 1,0 mm; der Gitterabstand liegt bei ca. 5 bis 10 mm.From the JP 02 020 645 A a continuous casting mold emerges in which longitudinal grooves and transverse grooves are made in the broad side plates in a predetermined grid. This also aims to reduce the heat flux density in the meniscus and thus reduce the risk of longitudinal cracks. The brought in Grooves range from 0.5 to 1.0 mm; the grid spacing is approx. 5 to 10 mm.

Aus der AT 269 392 ist eine Stranggießkokille bekannt, bei der gleichermaßen eine Reduzierung der Wärmestromdichte angestrebt wird, und zwar namentlich im oberen Bereich der Kokille. Dies wird durch eine größere Wandstärke der Kokille in ihrem oberen Bereich oder durch die Verwendung von stärker isolierendem Material in diesem Bereich erreicht. Dabei kann die Kokille in ihrem oberen Bereich entweder vollständig aus diesem Material bestehen oder auf der Wasserseite mit diesem Material beschichtet sein.From the AT 269 392 a continuous casting mold is known in which a reduction in the heat flow density is sought, namely in the upper region of the mold. This is achieved by increasing the wall thickness of the mold in its upper area or by using more insulating material in this area. The upper part of the mold can either consist entirely of this material or be coated with this material on the water side.

Die FR 2 658 440 beschreibt eine Stranggießkokille, bei der eine örtliche Reduzierung der Wärmestromdichte dadurch erreicht wird, dass in die Heißseite der Kokille Nuten eingebracht und diese Nuten mit einem zweiten Material mit geringer Wärmeleitfähigkeit gefüllt werden. Zusätzlich ist die gesamte Oberfläche der Kokille mit diesem zweiten Material beschichtet.The FR 2 658 440 describes a continuous casting mold in which a local reduction in the heat flux density is achieved by making grooves in the hot side of the mold and filling these grooves with a second material with low thermal conductivity. In addition, the entire surface of the mold is coated with this second material.

In der JP 06 134 553 A und in der JP 03 128 149 A wird das Aufrauen der Oberfläche von Gießrollen beschrieben, was bei dieser Anwendung eine Reduzierung der Wärmestromdichte bewirken soll.In the JP 06 134 553 A and in the JP 03 128 149 A describes the roughening of the surface of casting rollers, which is intended to reduce the heat flux density in this application.

Aus EP-A-1 099 496 A1 sind ein Verfahren zum Herstellen einer Stranggießkokille nach dem Oberbegriff von Anspruch 1 bzw. eine solche Stranggießkokille nach dem Oberbegriff von Anspruch 2 bekannt.Out EP-A-1 099 496 A1 a method for producing a continuous casting mold according to the preamble of claim 1 and such a continuous casting mold according to the preamble of claim 2 are known.

Eine Stranggießkokille zum Gießen von Strängen aus Metall,deren Gießquerschnitt durch Platten aus Kupferlegierungen begrenzt ist, die Breitseitenplatten oder Schmalseitenplatten bilden, wobei eine zumindest im Badspiegelbereich auf der Heißseite angeordnete, gegen Verschleiß und Hitze gebildete Oberfläche vorgesehen ist, wobei zumindest in den Breitseitenplatten im Badspiegelbereich ein vertiefter, streifenförmiger Kokillenabschnitt vorgesehen ist, und die vertiefte Oberfläche durch ein Strahlverfahren eine größere Rauhtiefe erhält, ist aus DE-A 102 56 751 bekannt.A continuous casting mold for casting strands of metal, the casting cross-section of which is delimited by plates made of copper alloys, which form broad-side plates or narrow-side plates, with a surface that is arranged at least in the bath mirror area on the hot side and formed against wear and heat, and at least in the broad side plates in the bath mirror area a recessed, strip-shaped mold section is provided, and the recessed surface is given a greater surface roughness by a blasting process, is off DE-A 102 56 751 known.

Aus DE-A 19 919 777 ist es bekannt, für Platten aus Kupferlegierungen im Anschluss an eine mechanische Bearbeitung stets ein Glattwalzen durchzuführen, so dass damit eine Stranggießkokille, die aus solchen Platten hergestellt wird, an ihrer Arbeitsseite eine äußerst glatte Oberflächenstruktur mit sehr geringen Rauhtiefen von nur etwa 0,8 µm erhält,
Mit den vorbekannten Maßnahmen soll ein verbessertes thermodynamisches Verhalten der Kokille und insbesondere deren Wandungen sowie eine verbesserte Einsatzfähigkeit beim Stranggießen erreicht werden. Generell wird eine gute Haftung des Gießpulvers an der Kokillenplatte und eine gleichmäßige Verteilung des Wärmestroms über die gesamte Kokille angestrebt.Out DE-A 19 919 777 It is known to always carry out roller burnishing for plates made of copper alloys following mechanical processing, so that a continuous casting mold made from such plates has an extremely smooth surface structure on its working side with very low roughness depths of only about 0.8 μm receives,
The previously known measures are intended to improve the thermodynamic behavior of the mold and, in particular, its walls, as well as improved usability can be achieved in continuous casting. In general, good adhesion of the casting powder to the mold plate and a uniform distribution of the heat flow over the entire mold are aimed for.

Die Dicke und die Struktur der Gießpulverschicht zwischen der Kokillenwand und der Strangschale bestimmt maßgeblich die Höhe der Wärmestromdichte zwischen Stahl und Kokille und damit die thermische Belastung sowohl der Strangschale als auch des Kokillenmaterials. Durch lokale und zeitliche Änderungen der Gießpulverschicht besonders im Bereich des Gießspiegels können deshalb starke Spannungen in der Strangschale entstehen, die besonders bei rissempfindlichen Stahlsorten zu Längsrissen führen. Aber auch die Oberfläche der Kokille wird durch wechselnde thermische Beaufschlagung starken mechanischen Belastungen ausgesetzt. Daher soll der maximale Wärmestrom im Bereich des Gießspiegels niedrig und möglichst gleichmäßig sein, um so besonders bei längsrissempfindlichen Stahlsorten die Gefahr der Rissbildung zu verringern.The thickness and the structure of the casting powder layer between the mold wall and the strand shell largely determine the level of heat flow density between the steel and the mold and thus the thermal load on both the strand shell and the mold material. Due to local and temporal changes in the casting powder layer, especially in the area of the casting level, strong stresses can arise in the strand shell, which lead to longitudinal cracks, especially in the case of steel types that are sensitive to cracks. However, the surface of the mold is also exposed to strong mechanical loads as a result of changing thermal loads. Therefore, the maximum heat flow in the area of the meniscus should be low and as uniform as possible in order to reduce the risk of cracking, especially in the case of steel types that are sensitive to longitudinal cracks.

Zusätzlich wird angestrebt, dass die Reibung zwischen den Breitseiten und den Schmalseiten der Kokille während der Schmalseitenverstellung möglichst gering ist. Schließlich wird angestrebt, dass durch eine geringe Wärmestromdichte die thermische Belastung im Gießspiegel verringert wird, was sich positiv auf die Lebensdauer der Kokille auswirken soll.In addition, the aim is that the friction between the broad sides and the narrow sides of the mold is as low as possible during the narrow side adjustment. Finally, the aim is to reduce the thermal load in the meniscus through a low heat flux density, which should have a positive effect on the life of the mold.

Die vorgeschlagenen Maßnahmen erreichen dieses Ziel nur teilweise bzw. mit einem relativ hohen Fertigungsaufwand.The proposed measures achieve this goal only partially or with a relatively high manufacturing cost.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung einer Stranggießkokille sowie eine Stranggießkokille zu schaffen, mit dem bzw. mit der die genannten angestrebten Eigenschaften möglichst gut erreicht werden, wobei dies mit möglichst geringem Fertigungsaufwand und damit mit geringen Kosten erreicht werden soll.The invention is therefore based on the object of creating a method for producing a continuous casting mold and a continuous casting mold with which the stated desired properties are achieved as well as possible, this being achieved with the least possible manufacturing effort and thus with low costs.

Die Lösung dieser Aufgabe durch die Erfindung ist verfahrensgemäß dadurch gekennzeichnet, dass als letzter Arbeitsschritt bei der Herstellung der Oberfläche der Kokille eine mechanische Bearbeitung durchgeführt wird, die eine anisotrop strukturierte Oberfläche erzeugt, derart, dass die Oberfläche der Kokille in Gießrichtung eine größere Rauheit aufweist als in Richtung quer zur Gießrichtung und zeilenförmig ausgebildete und orientierte Erhöhungen und Vertiefungen aufweist, die in Richtung quer zur Gießrichtung verlaufen, wobei der letzte Arbeitsschritt ein Fräsverfahren ist.The solution to this problem by the invention is characterized according to the method that as the last work step in the production of the surface of Mold a mechanical processing is carried out, which generates an anisotropically structured surface, in such a way that the surface of the mold has a greater roughness in the casting direction than in the direction transverse to the casting direction and has elevations and depressions formed in lines and oriented transversely to the casting direction The last step is a milling process.

Unter Anisotropie ist zu verstehen, dass sich Oberflächencharakteristika in Abhängigkeit der Oberflächenrichtung ändern, in denen sie bestimmt werden. Bei der hier in Rede stehenden Oberfläche der Kokille heißt dies insbesondere, dass Parameter wie z. B. Rauheit in Gießrichtung gemessen andere Werte aufweisen, als senkrecht dazu, d. h. in Querrichtung zur Gießrichtung.Anisotropy is understood to mean that surface characteristics change depending on the surface direction in which they are determined. In the case of the surface of the mold in question here, this means in particular that parameters such as B. measured roughness in the casting direction have different values than perpendicular to it, d. H. in the transverse direction to the casting direction.

Die Stranggießkokille, die zumindest eine mechanisch bearbeitete Oberfläche aufweist, die bei ihrer bestimmungsgemäßen Benutzung Kontakt mit schmelzflüssigem Material hat, ist erfindungsgemäß dadurch gekennzeichnet, dass die Oberfläche zumindest teilweise eine anisotrope Struktur aufweist, derart, dass die Oberfläche der Kokille in Gießrichtung eine größere Rauheit aufweist als in Richtung quer zur Gießrichtung, und dass die Oberfläche zeilenförmig ausgebildete und orientierte Erhöhungen und Vertiefungen aufweist, die in Richtung quer zur Gießrichtung verlaufen, wobei die Erhöhungen und Vertiefungen als Wellen ausgebildet sind, deren Wellenberge und Wellentäler in Richtung quer zur Gießrichtung verlaufen, und die Höhe der Wellen zwischen 2 µm und 250 µm beträgt.The continuous casting mold, which has at least one mechanically processed surface which, when used as intended, is in contact with molten material, is characterized according to the invention in that the surface at least partially has an anisotropic structure such that the surface of the mold has a greater roughness in the casting direction than in the direction transverse to the casting direction, and that the surface has elevations and depressions which are linearly designed and oriented and which run in the direction transverse to the casting direction, the elevations and depressions being designed as waves whose wave crests and troughs extend in the direction transverse to the casting direction, the height of the waves is between 2 µm and 250 µm.

Unter Berücksichtigung dessen, dass die anisotrop strukturierte Oberfläche zeilenförmig ausgebildete und orientierte Erhöhungen und Vertiefungen aufweist, die in Richtung quer zur Gießrichtung verlaufen, sind diese Erhöhungen und Vertiefungen als Wellen ausgebildet, deren Wellenberge und Wellentäler in Richtung quer zur Gießrichtung (G) verlaufen; die Wellen haben dabei vorzugsweise im Querschnitt im Wesentlichen eine abgerundete Form. Bewährt hat es sich, wenn die Höhe der Wellen zwischen 2 µm und 250 µm, insbesondere zwischen 10 µm und 50 µm, beträgt.Taking into account that the anisotropically structured surface has line-shaped and oriented elevations and depressions which run in the direction transverse to the casting direction, these elevations and depressions are designed as waves, the wave crests and troughs of which extend in the direction transverse to the casting direction (G); the shafts preferably have a substantially rounded shape in cross section. It has proven useful if the height of the waves is between 2 μm and 250 μm, in particular between 10 μm and 50 μm.

Die Höhe der Wellen auf der Oberfläche kann in Gießrichtung und/oder quer zur Gießrichtung konstant bleiben oder variabel eingestellt werden.The height of the waves on the surface can remain constant in the casting direction and / or transversely to the casting direction or can be set variably.

Der Erfindungsvorschlag stellt also darauf ab, dass die gewünschte anisotrope Oberflächenstruktur im letzten Schritt der formgebenden, mechanischen Bearbeitung der Kokillenoberfläche erzeugt wird. Vorteilhaft wird dabei die bearbeitete Oberfläche so gestaltet, dass in Gießrichtung eine andere makroskopische Struktur erzeugt wird als quer zur Gießrichtung. Gleichermaßen kann auch die mikroskopische Rauheit der Oberfläche in Gießrichtung und quer dazu unterschiedlich ausgebildet sein.The proposal of the invention is therefore based on the fact that the desired anisotropic surface structure is produced in the last step of the shaping, mechanical processing of the mold surface. The machined surface is advantageously designed in such a way that it is different in the casting direction macroscopic structure is generated as being transverse to the casting direction. Equally, the microscopic roughness of the surface can also be designed differently in the casting direction and across it.

Mit einer größeren Rauheit in Gießrichtung sowie einer makroskopischen Struktur der Oberfläche mit zeilenförmig quer zur Gießrichtung verlaufenden Erhöhungen wird erreicht, dass die Gießpulverschicht besonders im Bereich des Gießspiegels besser an der Kokillenplatte haftet und nicht so leicht vom Strang - vollständig oder nur lokal - abgerieben wird. Gleichzeitig kommt es sowohl durch die erhöhte Rauheit als auch durch die makroskopische Struktur der Oberfläche zu einer Reduktion und Vergleichmäßigung des Wärmestroms, was ebenfalls zu einer Verringerung der Längsrissneigung führt. Durch die Reduzierung der Wärmestromdichte im Gießspiegel wird zusätzlich die thermische Belastung der Kokillenplatte verringert, was eine höhere Standzeit der Kokillenplatten zur Folge hat.With a greater roughness in the casting direction and a macroscopic structure of the surface with elevations running in rows across the casting direction, it is achieved that the casting powder layer adheres better to the mold plate, especially in the area of the casting level, and is not so easily rubbed off the strand - completely or only locally. At the same time, both the increased roughness and the macroscopic structure of the surface lead to a reduction and equalization of the heat flow, which also leads to a reduction in the tendency towards longitudinal cracks. By reducing the heat flow density in the meniscus, the thermal load on the mold plate is also reduced, which results in a longer service life of the mold plates.

Von Vorteil ist es weiterhin, dass die gewünschte Oberflächenstruktur während der mechanischen, spanabhebenden Bearbeitung der Kokillenoberfläche entsteht. Das bedeutet, dass weitere Bearbeitungsschritte, wie z. B. das Einbringen von Nuten in die Oberfläche, das Beschichten der Oberfläche im Gießspiegelbereich oder das Aufrauen der Oberfläche durch Sand- oder Kugelstrahlen, nicht erforderlich sind, was den Erfindungsvorschlag wirtschaftlich macht. Damit kann die vorteilhafte anisotrope Oberflächenstruktur ohne großen Aufwand nicht nur bei der Fertigung der Kokillen, sondern auch bei jeder Überarbeitung der Kokillenoberfläche erzeugt werden, was in gewissen zeitlichen Abständen zu erfolgen hat.It is also advantageous that the desired surface structure is created during the mechanical, machining of the mold surface. This means that further processing steps, such as B. the introduction of grooves in the surface, the coating of the surface in the meniscus area or the roughening of the surface by sand or shot peening, are not required, which makes the inventive proposal economical. In this way, the advantageous anisotropic surface structure can be produced without great effort not only during the production of the molds, but also each time the mold surface is reworked, which has to take place at certain time intervals.

Durch die Gestaltung der Kokillenoberflächen in der beschriebenen Weise mit quer zur Gießrichtung orientierten makroskopischen Erhöhungen bzw. durch eine Rauheit, die in Gießrichtung größer ist als quer zu ihr, wird bei Kokillen, die aus einzelnen Kokillenplatten bestehen (z. B. Bramme, Dünnbramme) zusätzlich auch die Reibung zwischen Breit- und Schmalseiten bei der Schmalseitenverstellung reduziert.By designing the mold surfaces in the manner described with macroscopic elevations oriented transversely to the casting direction or by a roughness that is greater in the casting direction than transversely to it, molds that consist of individual mold plates (e.g. slab, thin slab) additionally the friction between wide and narrow sides when adjusting the narrow sides is also reduced.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.An exemplary embodiment of the invention is shown in the drawing.

Es zeigen:

Fig. 1
schematisch eine Kokillenplatte mit anisotroper Oberfläche sowie die Oberflächentopologie in vergrößerter Darstellung,
Fig. 2
schematisch das Profil der Oberfläche der Kokillenplatte in dreidimensionaler Darstellung und
Fig. 3
den vergrößert dargestellten Schnitt A-B gemäß Fig. 1.
Show it:
Fig. 1
schematically a mold plate with anisotropic surface and the surface topology in an enlarged view,
Fig. 2
schematically the profile of the surface of the mold plate in three-dimensional representation and
Fig. 3
the enlarged section AB according to Fig. 1 .

In Fig. 1 ist die Ansicht derjenigen Fläche einer Kokillenplatte einer Stranggießkokille 1 dargestellt, die im Einsatz der Stranggießkokille 1 mit schmelzflüssigem Material (Stahl) bzw. der erstarrten Strangschale Kontakt hat. Die Strangschale passiert dabei die Kokillenplatte in Gießrichtung G. Damit die oben erläuterten Vorteile erzielt werden, ist die Oberfläche 2 mit einer speziellen Struktur versehen: Die Oberflächentopologie, insbesondere die Rauhigkeit, der Oberfläche 2 ist anisotrop ausgebildet, d. h. es ergeben sich in Gießrichtung G und in Richtung Q quer zur Gießrichtung G unterschiedliche Rauhigkeitswerte.In Fig. 1 the view of that surface of a mold plate of a continuous casting mold 1 is shown which, when the continuous casting mold 1 is in use, is in contact with molten material (steel) or the solidified strand shell. The strand shell passes the mold plate in the casting direction G. In order to achieve the advantages explained above, the surface 2 is provided with a special structure: The surface topology, in particular the roughness, of the surface 2 is anisotropic, ie it results in the casting direction G and different roughness values in direction Q transverse to casting direction G.

Die Kokillenplatte ist hierbei mit einer Vielzahl von Erhöhungen und Vertiefungen versehen, die in Fig. 1 nur sehr schematisch dargestellt sind. Die Herstellung dieser Erhöhungen und Vertiefungen erfolgt beim letzten mechanischen Bearbeitungsvorgang bei der Fertigung der Kokillenplatte. Die Oberfläche der Kokillenplatte wird im letzten Bearbeitungsschritt im Zeilenfräsverfahren gefräst. Hierzu wird z. B. ein Fräswerkzeug mit einem Durchmesser von 100 bis 150 mm eingesetzt, das mit üblichen Wendeschneidplatten, z. B. aus Hartmetall, versehen ist. Die Materialabnahme beim letzten Bearbeitungsschritt ist gegeringer als 1 mm, vorzugsweise geringer als 0,5 mm. Entsprechend der gewählten Abnahme sowie der weiteren Fräsparameter wie Drehzahl, Vorschubgeschwindigkeit, Schnittgeschwindigkeit, Abstand der gefrästen Zeilen, Kühlmittel, Fräsrichtung sowie Anstellwinkel des Werkzeugs zur Plattenoberfläche (Sturz), lassen sich Ausprägungen und Struktur der Erhöhungen und Vertiefungen auf der Kokillenoberfläche gezielt einstellen.The mold plate is provided with a large number of elevations and depressions, which in Fig. 1 are only shown very schematically. The production of these elevations and depressions takes place during the last mechanical processing operation in the production of the mold plate. In the last machining step, the surface of the mold plate is milled using the line milling process. For this purpose z. B. used a milling tool with a diameter of 100 to 150 mm, which with conventional indexable inserts, z. B. made of hard metal is provided. The material consumption in the last processing step is lower than 1 mm, preferably less than 0.5 mm. Depending on the selected acceptance and other milling parameters such as speed, feed rate, cutting speed, distance between the milled lines, coolant, milling direction and the angle of the tool to the plate surface (lintel), the characteristics and structure of the elevations and depressions on the mold surface can be specifically set.

Fig. 2 zeigt das Profil der endbearbeiteten Oberfläche in dreidimensionaler Ansicht. Hier wird ersichtlich, dass die Rauheit der Oberfläche in Gießrichtung G größer ist als quer zur Gießrichtung Q. Die Kokillenplatte ist also mit einer Vielzahl von Erhebungen und Vertiefungen versehen, die in Fig. 1 nur sehr schematisch dargestellt sind. Die Herstellung dieser Erhebungen und Vertiefungen erfolgt beim letzten mechanischen Bearbeitungsvorgang bei der Fertigung der Kokillenplatte. Fig. 2 shows the profile of the finished surface in three-dimensional view. It can be seen here that the roughness of the surface in the casting direction G is greater than that transversely to the casting direction Q. The mold plate is thus provided with a large number of elevations and depressions, which are shown in FIG Fig. 1 are only shown very schematically. The production of these elevations and depressions takes place during the last mechanical processing operation in the production of the mold plate.

Die Höhe H der zeilenförmig orientierten Erhöhungen und Vertiefungen ist in Fig. 3 zu sehen und liegt typischerweise im Bereich von 2 µm bis 250 µm, was durch die Wahl der Fräsparameter beeinflusst werden kann.The height H of the line-shaped oriented elevations and depressions is in Fig. 3 can be seen and is typically in the range from 2 µm to 250 µm, which can be influenced by the choice of milling parameters.

Bezugszeichenliste:List of reference symbols:

11
StranggießkokilleContinuous casting mold
22
Oberflächesurface
33
WellenstrukturWave structure
GG
GießrichtungPouring direction
QQ
Richtung quer zur GießrichtungDirection transverse to the casting direction
HH
Höhe der WellenHeight of the waves

Claims (5)

  1. Method of manufacturing a continuous casting mould (1), in which at least one surface (2), which has contact with molten material in use of the mould according to intention, is mechanically processed,
    characterised in that
    in the last working step in the production of the surface (2) of the mould (1) a mechanical processing is carried out which generates an anisotropically structured surface in such a way that the surface (2) of the mould (1) has a greater roughness in casting direction (G) than in direction (Q) transverse to the casting direction (G) and comprises elevations and depressions which are formed and oriented to be line-shaped and which extend in direction (Q) transversely to the casting direction (G) and are formed as waves, the wave crests and wave valleys of which extend in direction (Q) transverse to the casting direction (G), wherein the height of the waves is between 2 µm and 250 µm, and
    the last working step is a milling process.
  2. Continuous casting mould (1), which has at least one mechanically processed surface (2) having contact with molten material in use in accordance with intention, produced in accordance with the method according to claim 1,
    characterised in that
    the surface (2) at least in part has an anisotropic structure such that the surface (2) of the mould (1) has a greater roughness in casting direction (G) than in direction (Q) transverse to the casting direction (G),
    the surface (2) has elevations and depressions which are constructed and oriented to be line-shaped and which extend in direction (Q) transverse to the casting direction (G), wherein the elevations and depressions are formed as waves, the wave crests and wave valleys of which extend in direction (Q) transverse to the casting direction (G), and
    the height (H) of the waves is between 2 µm and 250 µm.
  3. Continuous casting mould according to claim 2,
    characterised in that
    the waves have a substantially rounded form in cross-section.
  4. Continuous casting mould according to claim 2 or 3,
    characterised in that
    the height (H) of the waves in casting direction (G) is constant.
  5. Continuous casting mould according to claim 2 or 3,
    characterised in that
    the height (H) of the waves in casting direction (G) is variable.
EP06723315.5A 2005-03-10 2006-03-09 Method for producing a continuous casting mold and corresponding continuous casting mold Active EP1855824B1 (en)

Applications Claiming Priority (3)

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DE102005011532 2005-03-10
DE102005023745.2A DE102005023745B4 (en) 2005-03-10 2005-05-24 Process for producing a continuous casting mold and continuous casting mold
PCT/EP2006/002164 WO2006094803A1 (en) 2005-03-10 2006-03-09 Method for producing a continuous casting mold and corresponding continuous casting mold

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EP1855824A1 EP1855824A1 (en) 2007-11-21
EP1855824B1 true EP1855824B1 (en) 2021-02-17

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EP (1) EP1855824B1 (en)
JP (1) JP4559520B2 (en)
KR (1) KR101152678B1 (en)
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CA (1) CA2597100C (en)
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JP5606824B2 (en) * 2010-08-18 2014-10-15 株式会社不二製作所 Mold surface treatment method and mold surface-treated by the above method
DE102013114326A1 (en) * 2013-12-18 2015-06-18 Thyssenkrupp Steel Europe Ag Casting mold for casting molten steel
JP6413991B2 (en) * 2015-09-14 2018-10-31 Ｊｆｅスチール株式会社 How to clean the slab surface

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CN101137453B (en) 2012-09-05
EP1855824A1 (en) 2007-11-21
CA2597100A1 (en) 2006-09-14
JP4559520B2 (en) 2010-10-06
ES2864578T3 (en) 2021-10-14
KR101152678B1 (en) 2012-06-15
KR20070110271A (en) 2007-11-16
CA2597100C (en) 2013-01-22
US20080173422A1 (en) 2008-07-24
US20110180231A1 (en) 2011-07-28
CN101137453A (en) 2008-03-05
WO2006094803A1 (en) 2006-09-14
JP2008532767A (en) 2008-08-21

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