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EP0062209B1 - Device for cooling steel strands - Google Patents

Device for cooling steel strands Download PDF

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Publication number
EP0062209B1
EP0062209B1 EP82102333A EP82102333A EP0062209B1 EP 0062209 B1 EP0062209 B1 EP 0062209B1 EP 82102333 A EP82102333 A EP 82102333A EP 82102333 A EP82102333 A EP 82102333A EP 0062209 B1 EP0062209 B1 EP 0062209B1
Authority
EP
European Patent Office
Prior art keywords
cooling
heat
strand
cooling device
support roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82102333A
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German (de)
French (fr)
Other versions
EP0062209A1 (en
Inventor
Werner Dr.-Ing. Rahmfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT82102333T priority Critical patent/ATE10450T1/en
Publication of EP0062209A1 publication Critical patent/EP0062209A1/en
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Publication of EP0062209B1 publication Critical patent/EP0062209B1/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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the invention relates to a device for cooling cast steel strands.
  • Cast steel strands are cooled using the spray water cooling process, in which the heat of vaporization of the cooling water is predominantly used to dissipate the heat of the cast strand.
  • the cooling water In the spray water cooling process, the cooling water not only extracts the heat from the hot cast strand, but also protects the supporting elements and other components of the continuous casting apparatus against overheating (Handbuch der Stranggie, 188 by Dr. Herrmann).
  • the invention assumes that the continuous casting mold forms the primary cooling zone and the zone below the continuous casting mold forms the secondary cooling zone.
  • the invention is based on the object, in a complete departure from the known spray water cooling process to remove the heat from the hot cast strand dry by means of heat conduction.
  • the object is achieved in that the cast strand in the secondary cooling zone, the heat is extracted exclusively by means of internally cooled metallic components that surround or support and / or guide the cast strand at a short distance, the coolant being circulated and that Component wall facing the cast strand in the sense of reducing the thermal resistance has depressions in its inner surface and that this inner surface consists of a plurality of grooves, the width and depth of which are smaller than one millimeter.
  • the invention initially avoids all the disadvantages of spray water cooling, namely an uneven cooling of the strand surface, unevenly high thermal stresses in the strand shell, edge supercooling, uncontrollable amounts of cooling water on the strand surface, an otherwise required spray water treatment, a large support distance because of the spray water nozzles arranged between two support elements, and further Thermal shock stresses of the support elements (thermal alternating voltages) and thermal distortion of the support elements.
  • Advantages of the invention are then a uniform cooling of the surface of the cast strand, so that the thermal stresses in the shell of the cast strand can be kept low.
  • the spacing of the support elements can also be made smaller from the start, so that the dreaded bulges of the cast strand which has not yet solidified sufficiently inside can be avoided.
  • the present invention is also based on a cooling circuit in which the cooling medium circulates within the components or absorbs heat within the components through the component wall and is cooled back after removal outside the component.
  • the problem with the cooling device described at the outset is to conduct a high heat flow through the component wall, which requires a low thermal resistance of the component wall.
  • the component wall could be made very thin, but this generally contradicts the principles of high mechanical strength of the component. Thin component walls are e.g. B. not permitted with long length support rollers.
  • the aim of the cooling device is therefore to get by without an inadmissibly thin component wall and still achieve a low thermal resistance value or a high heat transfer rate.
  • the cooling device according to the invention can also be designed such that the inner surface of the component wall consists of a capillary structure, similar to a so-called heat pipe.
  • the cooling device according to the invention can also be designed so that the component consists of a support roller, the hollow bearing pins are provided for the supply and / or removal of liquid or vaporous cooling medium and that a distance between three and five millimeters is maintained from the support roller to the support roller is.
  • the support rollers enable uniform cooling of the cast strand on the roller contact line. Furthermore, the support roller itself is cooled without the disadvantages of spray water cooling.
  • a heat flow of high density and a high load-bearing capacity of the component are achieved at the same time if the depressions in the component wall have an approximately undulating profile in the longitudinal cross section, within which the capillary structure is provided. These depressions advantageously increase the heat flow through the component wall.
  • a complete cooling system for a section of the support roller frame of a continuous caster is created in that several support rollers with their coolant discharge bearing journals on one first coolers are connected in the heat-dissipating area and the coolant supply bearing journals are connected to a second cooler with the interposition of a pump in a low-temperature range.
  • a closed cooling circuit which is adapted to the design of a continuous casting installation is also designed in such a way that the first cooler extends approximately parallel to the cast strand.
  • FIG. 1 shows a continuous casting mold 1, a strand guide, which consists of an upper cooling roller section 2 and a lower cooling roller section 3.
  • the individual support rollers 4 are at a distance 5, which is approximately three to five millimeters due to the invention.
  • the component according to the invention which is formed by the support rollers 4 in FIG. 1, can also be used in the form of a shaft section or the like. This component then surrounds the cast strand 6 with a gap distance which does not impair the transport of the cast strand 6 or, as is the case with the support rollers 4, supports and / or guides the cast strand 6 by direct contact.
  • the embodiment of the invention according to FIG. 1 therefore does not require the known spray water cooling (which is not shown).
  • the disadvantages of the known spray water cooling process have been described in detail in the introduction.
  • the cooling water emerging from the known spray nozzles causes irregular cooling of the strand surface of the cast strand, which can result in unevenly high thermal stresses in the strand shell, as well as edge cooling and can vagabond in uncontrollable amounts on the strand surface and in rest requires a splash water treatment.
  • the known spray cooling process also causes thermal shock stresses on the support elements (alternating thermal stresses) and thermal distortion of the support elements.
  • the support rollers 4 are connected to the cooler 26 with their coolant discharge bearing journal 25 (FIG. 2).
  • the connection lies in the heat-releasing region 27 of the cooler 26.
  • the coolant supply bearing journals 28, which are preceded by a pump 30 in each case in lower-temperature regions 29, are also located on the cooler 26 in the low-temperature regions 29.
  • the cooler 26 itself is countercurrently operated to heat the cast strand 6 by means of the entering coolant 31, which forms the gas or liquid jacket 32, cooled, the coolant 31 leaving the cooler 26 heated at 31a.
  • the cooler 26 extends approximately parallel to the cast strand 6 and lies next to or below or above the cast strand 6.
  • the support roller 4 according to FIG. 3 which is formed from the support roller sections 4a and 4b with the separate support bearings 11a, 11b, 11c and 11d.
  • the cooling device promotes cooling medium 14, for. B. cooling water, in a further not shown (open or closed) cooling medium circuit through the central tube 12 in the direction of arrow 14a, from whose mouth 12a the cooling medium flows out and deflected in the direction of arrow 14b flows through the cooling mold 13 and leaves heated (in vapor form or in a mixture of steam and liquid) the support roller 4a (4b) in the direction of the arrow 14c to be cooled.
  • the component wall 15 consists of the wall of the support roller 4.
  • the wall thickness 16 is continuously reduced in zones.
  • such a zone 17 does not represent a mechanical weakening of the remaining wall thickness 16.
  • Such a heat pipe is described in DE-AS 1264461. However, it acts as a closed component there.
  • the support roller 4 can have the outer shape of such a heat pipe.
  • heat dissipation as described below must be provided through the hollow bearing journals 20 and 21.
  • the inner surface 18 has depressions 22 which form an approximately undulating profile 24 in the longitudinal cross section 23.
  • the approximately wave-shaped course 24 avoids the formation of stress peaks in the material of the support rollers 4.
  • the wave-shaped course 24 can also be very elongated and flat, so that only one zone 17 is formed over the length of the support roller section 4a, 4b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

A method and apparatus for the cooling of a continuously cast metal strand, comprising a plurality of support rollers, located in the second zone of cooling. The support rollers are cooled from their interior by the passage therethrough of cooling fluid. The rollers have interior walls which display a wave-like shape to present a great surface area for superior cooling while still supporting the loading stress due to the weight of the metallic strand.

Description

Die Erfindung betrifft eine Vorrichtung zur Kühlung von Stahlgußsträngen.The invention relates to a device for cooling cast steel strands.

Stahlgußstränge werden im Spritzwasserkühlverfahren gekühlt, bei dem überwiegend die Verdampfungswärme des Kühlwassers ausgenutzt wird, um die Wärme des Gußstrangs abzuführen. Bei dem Spritzwasserkühlverfahren entzieht das Kühlwasser nicht nur dem heißen Gußstrang die Wärme, sondern schützt auch gleichzeitig die Stützelemente und andere Bauteile der Stranggießvorrichtung vor Überhitzung (Handbuch des Stranggießens 1958, 188 v. Dr. Herrmann).Cast steel strands are cooled using the spray water cooling process, in which the heat of vaporization of the cooling water is predominantly used to dissipate the heat of the cast strand. In the spray water cooling process, the cooling water not only extracts the heat from the hot cast strand, but also protects the supporting elements and other components of the continuous casting apparatus against overheating (Handbuch der Stranggießen 1958, 188 by Dr. Herrmann).

Es ist bekannt (DE-B2-913 697), innen gekühlte Walzen beim Kautschukgießen zu verwenden. Das Kautschukgießen unterscheidet sich jedoch in erheblichen Gesichtspunkten vom Stahlgie- ßen. Einer dieser wesentlichen Unterschiede besteht darin, beim Bearbeiten von Kautschuk über die Walze erst Wärme zuzuführen und durch Kühlen die Temperatur einzustellen.It is known (DE-B2-913 697) to use internally cooled rolls when casting rubber. However, rubber casting differs from steel casting in considerable respects. One of these essential differences is that when processing rubber via the roller, heat is first applied and the temperature is adjusted by cooling.

Es ist ferner bei einer Stranggießvorrichtung (DE-B-19 08 763), bei der der Kühlabschnitt unterhalb der Stranggießkokille als erste Kühlzone definiert ist, bekannt, eine zweite Kühlzone durch Führungsrollen zu bilden, die innen gekühlt sind. Der bekannte Vorschlag setzt daher unterhalb der Stranggießkokille das bekannte Spritzwasserkühlverfahren wie oben beschrieben voraus.In a continuous casting device (DE-B-19 08 763) in which the cooling section below the continuous casting mold is defined as the first cooling zone, it is also known to form a second cooling zone by guide rollers which are cooled on the inside. The known proposal therefore requires the known spray water cooling process as described above below the continuous casting mold.

Die Erfindung geht hingegen davon aus, daß die Stranggießkokille die Primärkühlzone und die Zone unterhalb der Stranggießkokille die Sekundärkühlzone bildet.The invention, however, assumes that the continuous casting mold forms the primary cooling zone and the zone below the continuous casting mold forms the secondary cooling zone.

Der Erfindung ist die Aufgabe zugrundegelegt, in völliger Abkehr von dem bekannten Spritzwasserkühlverfahren die Wärme aus dem heißen Gußstrang im Wege der Wärmeleitung trocken abzuführen.The invention is based on the object, in a complete departure from the known spray water cooling process to remove the heat from the hot cast strand dry by means of heat conduction.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß dem Gußstrang in der Sekundärkühlzone die Wärme ausschließlich mittels innen gekühlter metallischer Bauteile, die den Gußstrang in geringem Abstand umgeben oder stützen und/oder führen, entzogen wird, wobei das Kühlmittel im Kreislauf geführt wird und daß die dem Gußstrang zugewandte Bauteilwandung im Sinn einer Verringerung des Wärmewiderstandes in ihrer inneren Oberfläche Vertiefungen aufweist und daß diese innere Oberfläche aus einer Vielzahl von Rillen besteht, deren Breite und Tiefe kleiner als ein Millimeter sind. Die Erfindung vermeidet zunächst alle Nachteile der Spritzwasserkühlung, nämlich eine ungleichmäßige Kühlung der Strangoberfläche, ungleich hohe Wärmespannungen in der Strangschale, Kantenunterkühlung, unkontrollierbare Mengen von Kühlwasser auf der Strangoberfläche, eine sonst erforderliche Spritzwasseraufbereitung, einen großen Stützabstand wegen der zwischen zwei Stützelementen angeordneten Spritzwasserdüsen, ferner Thermoschockbeanspruchungen der Stützelemente (Wärmewechselspannungen) und einen Wärmeverzug der Stützelemente.The object is achieved in that the cast strand in the secondary cooling zone, the heat is extracted exclusively by means of internally cooled metallic components that surround or support and / or guide the cast strand at a short distance, the coolant being circulated and that Component wall facing the cast strand in the sense of reducing the thermal resistance has depressions in its inner surface and that this inner surface consists of a plurality of grooves, the width and depth of which are smaller than one millimeter. The invention initially avoids all the disadvantages of spray water cooling, namely an uneven cooling of the strand surface, unevenly high thermal stresses in the strand shell, edge supercooling, uncontrollable amounts of cooling water on the strand surface, an otherwise required spray water treatment, a large support distance because of the spray water nozzles arranged between two support elements, and further Thermal shock stresses of the support elements (thermal alternating voltages) and thermal distortion of the support elements.

Vorteile der Erfindung sind sodann eine gleichmäßige Kühlung der Oberfläche des Gußstrangs, so daß die Wärmespannungen in der Schale des Gußstrangs niedrig gehalten werden können. Durch den Wegfall der Spritzwasserdüsen kann außerdem der Abstand der Stützelemente von Anfang an kleiner vorgesehen werden, so daß die gefürchteten Ausbauchungen des im Inneren noch nicht genügend erstarrten Gußstranges vermieden werden.Advantages of the invention are then a uniform cooling of the surface of the cast strand, so that the thermal stresses in the shell of the cast strand can be kept low. By eliminating the spray water nozzles, the spacing of the support elements can also be made smaller from the start, so that the dreaded bulges of the cast strand which has not yet solidified sufficiently inside can be avoided.

Die vorliegende Erfindung basiert außerdem auf einem Kühlkreislauf, bei dem das Kühlmedium innerhalb der Bauteile zirkuliert oder innerhalb der Bauteile durch die Bauteilwandung Wärme aufnimmt und nach Abfuhr außerhalb des Bauteils rückgekühlt wird.The present invention is also based on a cooling circuit in which the cooling medium circulates within the components or absorbs heat within the components through the component wall and is cooled back after removal outside the component.

Bei der eingangs bezeichneten Kühlvorrichtung besteht das Problem, einen hohen Wärmefluß durch die Bauteilwandung zu leiten, was einen geringen Wärmewiderstand der Bauteilwandung voraussetzt. Zur Lösung dieses Problems könnte die Bauteilwandung sehr dünn ausgeführt werden, was jedoch in der Regel den Prinzipien einer hohen mechanischen Belastbarkeit des Bauteils widerspricht. Dünne Bauteilwandungen sind z. B. bei Stützrollen großer Länge nicht zulässig.The problem with the cooling device described at the outset is to conduct a high heat flow through the component wall, which requires a low thermal resistance of the component wall. To solve this problem, the component wall could be made very thin, but this generally contradicts the principles of high mechanical strength of the component. Thin component walls are e.g. B. not permitted with long length support rollers.

Mit der Kühlvorrichtung wird daher angestrebt, ohne eine unzulässig dünne Bauteilwandung auszukommen und trotzdem einen geringen Wärmewiderstandswert bzw. eine hohe Wärmedurchgangsleistung zu erreichen.The aim of the cooling device is therefore to get by without an inadmissibly thin component wall and still achieve a low thermal resistance value or a high heat transfer rate.

Die erfindungsgemäße Kühlvorrichtung kann alternativ auch derart gestaltet sein, daß die innere Oberfläche der Bauteilwandung aus einer Kapillarstruktur, ähnlich einem sogenannten Wärmeleitrohr besteht.Alternatively, the cooling device according to the invention can also be designed such that the inner surface of the component wall consists of a capillary structure, similar to a so-called heat pipe.

Die erfindungsgemäße Kühlvorrichtung kann ferner dahingehend gestaltet sein, daß das Bauteil aus einer Stützrolle besteht, deren hohle Lagerzapfen für die Zufuhr und/oder für die Abfuhr flüssigen bzw. dampfförmigen Kühlmediums vorgesehen sind und daß von Stützrolle zu Stützrolle ein Abstand zwischen drei und fünf Millimeter eingehalten ist. Die Stützrollen ermöglichen auf der Rollenberührungslinie eine gleichmäßige Kühlung des Gußstrangs. Ferner ist die Stützrolle selbst ohne die aufgeführten Nachteile einer Spritzwasserkühlung gekühlt.The cooling device according to the invention can also be designed so that the component consists of a support roller, the hollow bearing pins are provided for the supply and / or removal of liquid or vaporous cooling medium and that a distance between three and five millimeters is maintained from the support roller to the support roller is. The support rollers enable uniform cooling of the cast strand on the roller contact line. Furthermore, the support roller itself is cooled without the disadvantages of spray water cooling.

Ein Wärmestrom hoher Dichte und eine hohe Belastbarkeit des Bauteils zugleich werden dann erreicht, wenn die Vertiefungen in der Bauteilwandung im Längsquerschnitt einen etwa wellenförmigen Verlauf aufweisen, innerhalb dessen die Kapillarstruktur vorgesehen ist. Diese Vertiefungen verstärken vorteilhafterweise den Wärmestrom durch die Bauteilwandung.A heat flow of high density and a high load-bearing capacity of the component are achieved at the same time if the depressions in the component wall have an approximately undulating profile in the longitudinal cross section, within which the capillary structure is provided. These depressions advantageously increase the heat flow through the component wall.

Ein vollständiges Kühlsystem für einen Abschnitt des Stützrollengerüstes einer Stranggießanlage entsteht dadurch, daß mehrere Stützrollen mit ihren Kühlmittel-Abfuhrlagerzapfen an einen ersten Kühler im wärmeabgebenden Bereich angeschlossen sind und die Kühlmittel-Zufuhrlagerzapfen an einem zweiten Kühler unter Zwischenschaltung einer Pumpe in einem Niedertemperaturbereich angeschlossen sind. Ein geschlossener, der Bauform einer Stranggießanlage angepaßter Kühlkreislauf wird außerdem derart gestaltet, daß der erste Kühler sich etwa parallel zum Gußstrang erstreckt.A complete cooling system for a section of the support roller frame of a continuous caster is created in that several support rollers with their coolant discharge bearing journals on one first coolers are connected in the heat-dissipating area and the coolant supply bearing journals are connected to a second cooler with the interposition of a pump in a low-temperature range. A closed cooling circuit which is adapted to the design of a continuous casting installation is also designed in such a way that the first cooler extends approximately parallel to the cast strand.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

  • Figur 1 den schematischen Aufbau einer Stranggießanlage in Seitenansicht,
  • Figur 2 eine Vorderansicht mehrerer erfindungsgemäß gestalteter Stützrollen, die an den erfindungsgemäßen Kühler angeschlossen sind und ein Stützrollengerüst für den Gußstrang bilden,
  • Figur 3 eine geteilte Stützrolle, die mit der Erfindung ausgestattet ist (ein Rollenabschnitt ist geschnitten gezeichnet),
  • Figur 4 den vergrößerten Ausschnitt aus einer mit Erfundungsmerkmalen versehenen Stützrolle und
  • Figur 5 einen Ausschnitt aus dem erfindungsgemäßen Verlauf der Bauteilwandung als Beispiel.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
  • FIG. 1 shows the schematic structure of a continuous caster in a side view,
  • FIG. 2 shows a front view of a plurality of support rollers designed according to the invention, which are connected to the cooler according to the invention and form a support roller frame for the cast strand,
  • FIG. 3 shows a split support roller which is equipped with the invention (a roller section is shown in section),
  • Figure 4 shows the enlarged section of a support roller provided with invention features and
  • Figure 5 shows a section of the course of the component wall according to the invention as an example.

Die Stranggießvorrichtung gemäß Fig. 1 zeigt eine Stranggießkokille 1, eine Strangführung, die aus einem oberen Kühlrollenabschnitt 2 und einem unteren Kühlrollenabschnitt 3 besteht. Die einzelnen Stützrollen 4 befinden sich in einem Abstand 5, der aufgrund der Erfindung etwa drei bis fünf Millimeter beträgt.1 shows a continuous casting mold 1, a strand guide, which consists of an upper cooling roller section 2 and a lower cooling roller section 3. The individual support rollers 4 are at a distance 5, which is approximately three to five millimeters due to the invention.

Das erfindungsgemäße Bauteil, das in Fig. 1 durch die Stützrollen 4 gebildet wird, kann auch in Form eines Schachtabschnittes oder dgl. angewendet werden. Dieses Bauteil umgibt dann den Gußstrang 6 mit einem Spaltabstand, der den Transport des Gußstranges 6 nicht beeinträchtigt oder, wie dies bei den Stützrollen 4 der Fall ist, den Gußstrang 6 durch unmittelbare Berührung stützt und/oder führt.The component according to the invention, which is formed by the support rollers 4 in FIG. 1, can also be used in the form of a shaft section or the like. This component then surrounds the cast strand 6 with a gap distance which does not impair the transport of the cast strand 6 or, as is the case with the support rollers 4, supports and / or guides the cast strand 6 by direct contact.

Die Ausführungsform der Erfindung gemäß Fig. 1 benötigt daher nicht die bekannte Spritzwasserkühlung (die nicht dargestellt ist). Die nachteile des bekannten Spritzwasserkühl verfahrens wurden einleitend eingehend geschildert.The embodiment of the invention according to FIG. 1 therefore does not require the known spray water cooling (which is not shown). The disadvantages of the known spray water cooling process have been described in detail in the introduction.

Es soll daher lediglich noch einmal hervorgehoben werden, daß das aus den bekannten Spritzdüsen austretende Kühlwasser eine unregelmäßige Kühlung der Strangoberfläche des Gußstranges verursacht, wobei ungleich hohe Wärmespannungen in der Strangschale entstehen können, sowie Kantenunterkühlung verursacht und in unkontrollierbaren Mengen auf der Strangoberfläche vagabundieren kann und im übrigen eine Spritzwasseraufbereitung erfordert. Das bekannte Spritzkühlverfahren verursacht außerdem Thermoschockbeanspruchungen der Stützelemente (Wärmewechselspannungen) und eine Wärmeverzug des Stützelemente.It should therefore only be emphasized once again that the cooling water emerging from the known spray nozzles causes irregular cooling of the strand surface of the cast strand, which can result in unevenly high thermal stresses in the strand shell, as well as edge cooling and can vagabond in uncontrollable amounts on the strand surface and in rest requires a splash water treatment. The known spray cooling process also causes thermal shock stresses on the support elements (alternating thermal stresses) and thermal distortion of the support elements.

Die Stützrollen 4 sind mit ihrem Kühlmittel-Abfuhrlagerzapfen 25 an den Kühler 26 angeschlossen (Fig. 2). Der Anschluß liegt in dem wärmeabgebenden Bereich 27 des Kühlers 26. Die Kühlmittel-Zufuhrlagerzapfen 28, denen jeweils in temperaturniederen Bereichen 29 eine Pumpe 30 vorgeschaltet ist, liegen an dem Kühler 26 ebenfalls in den Niedertemperatur-Bereichen 29. Der Kühler 26 selbst wird im Gegenstromverfahren zum Wärmeanfall des Gußstranges 6 mittels des eintretenden Kühlmittels 31, das den Gas- bzw. Flüssigkeitsmantel 32 bildet, gekühlt, wobei das Kühlmittel 31 den Kühler 26 bei 31a erwärmt verläßt. Dabei erstreckt sich der Kühler 26 etwa parallel zum Gußstrang 6 und liegt neben oder unter oder über dem Gußstrang 6.The support rollers 4 are connected to the cooler 26 with their coolant discharge bearing journal 25 (FIG. 2). The connection lies in the heat-releasing region 27 of the cooler 26. The coolant supply bearing journals 28, which are preceded by a pump 30 in each case in lower-temperature regions 29, are also located on the cooler 26 in the low-temperature regions 29. The cooler 26 itself is countercurrently operated to heat the cast strand 6 by means of the entering coolant 31, which forms the gas or liquid jacket 32, cooled, the coolant 31 leaving the cooler 26 heated at 31a. The cooler 26 extends approximately parallel to the cast strand 6 and lies next to or below or above the cast strand 6.

Die bekannten Nachteile vermeidet die Stützrolle 4 gemäß Fig. 3, die aus den Stützrollenabschnitten 4a und 4b mit den separaten Stützlagern 11a, 11b, 11c und 11d gebildet ist.The known disadvantages are avoided by the support roller 4 according to FIG. 3, which is formed from the support roller sections 4a and 4b with the separate support bearings 11a, 11b, 11c and 11d.

Die erfindungsgemäße Kühlvorrichtung fördert Kühlmedium 14, z. B. Kühlwasser, in einem weiter nicht dargestellten (offenen oder geschlossenen) Kühlmedium-Kreislauf durch das Zentralrohr 12 in Pfeilrichtung 14a, aus dessen Mündung 12a das Kühlmedium ausströmt und in Pfeilrichtung 14b umgelenkt durch die Kühlform 13 strömt und verläßt erwärmt (in Dampfform oder in einer Mischung aus Dampf und Flüssigkeit) die Stützrolle 4a (4b) in Pfeilrichtung 14c, um abgekühlt zu werden.The cooling device according to the invention promotes cooling medium 14, for. B. cooling water, in a further not shown (open or closed) cooling medium circuit through the central tube 12 in the direction of arrow 14a, from whose mouth 12a the cooling medium flows out and deflected in the direction of arrow 14b flows through the cooling mold 13 and leaves heated (in vapor form or in a mixture of steam and liquid) the support roller 4a (4b) in the direction of the arrow 14c to be cooled.

Im gezeichneten Ausführungsbeispiel besteht die Bauteilwandung 15 aus der Wandung der Stützrolle 4. Im Bereich der Kühlform 13 ist die Wanddicke 16 zonenweise stetig vermindert. Eine solche Zone 17 stellt jedoch keine mechanische Schwächung der übrigen Wanddicke 16 dar.In the illustrated embodiment, the component wall 15 consists of the wall of the support roller 4. In the area of the cooling mold 13, the wall thickness 16 is continuously reduced in zones. However, such a zone 17 does not represent a mechanical weakening of the remaining wall thickness 16.

Die Belastungsfähigkeit der Stützrolle 4 wird durch die innere Oberfläche 18 gewährleistet, wobei der inneren Oberfläche 18 insbesondere zwei Funktionen zukommen :

  • Die Innenform übt Gewölbefunktion aus und vergrößert gleichzeitig die Oberfläche 18. Hinzu kommt die Kapillarstruktur 19, ähnlich derjenigen aus den sogenannten Wärmeleitrohren (heat-pipes).
The load capacity of the support roller 4 is ensured by the inner surface 18, the inner surface 18 having two functions in particular:
  • The inner shape performs a vaulting function and at the same time enlarges the surface 18. In addition, there is the capillary structure 19, similar to that from the so-called heat pipes.

Ein solches Wärmeleitrohr ist in der DE-AS 1264461 beschrieben. Es wirkt dort allerdings als geschlossenes Bauteil. Die Stützrolle 4 kann prinzipiell betrachtet die äußere Form eines sochen Wärmerohres aufweisen. Allerdings ist eine nachfolgend beschriebene Wärmeabfuhr durch die hohlen Lagerzapfen 20 bzw. 21 vorzusehen.Such a heat pipe is described in DE-AS 1264461. However, it acts as a closed component there. In principle, the support roller 4 can have the outer shape of such a heat pipe. However, heat dissipation as described below must be provided through the hollow bearing journals 20 and 21.

Die innere Oberfläche 18 weist Vertiefungen 22 auf, die im Längsquerschnitt 23 einen etwa wellenförmigen Verlauf 24 bilden. Der etwa wellenförmige Verlauf 24 vermeidet die Bildung von Spannungsspitzen im Werkstoff der Stützrollen 4. Der wellenförmige Verlauf 24 kann auch sehr langgestreckt und flach sein, so daß nur eine Zone 17 auf die Länge des Stützrollenabschnitts 4a, 4b entsteht.The inner surface 18 has depressions 22 which form an approximately undulating profile 24 in the longitudinal cross section 23. The approximately wave-shaped course 24 avoids the formation of stress peaks in the material of the support rollers 4. The wave-shaped course 24 can also be very elongated and flat, so that only one zone 17 is formed over the length of the support roller section 4a, 4b.

Die hohe Temperatur des Gußstrangs 6, die ca. 700 bis 1 100 °C betragen kann, läßt das Kühlmedium 14 bis zur Dampfform erwärmen. Es ist daher zweckmäßig, bei dem sehr hohen Wärmeinhalt innerhalb der Kühlform 13 den überhitzten Dampf abzuziehen und durch kühleren ungesättigten Dampf des « frischen Kühlmediums und/oder durch eine Mischung von flüssigem und dampfförmigen Kühlmedium kontinuierlich analog zu der einzuhaltenden Abkühlungskurve des langsam erstarrenden Gußstranges 6 zu ersetzen.The high temperature of the cast strand 6, which can be approximately 700 to 1 100 ° C, leaves the Kühlme Heat dium 14 to the vapor form. It is therefore expedient to draw off the superheated steam at the very high heat content within the cooling mold 13 and continuously cooler unsaturated steam from the "fresh cooling medium and / or through a mixture of liquid and vaporous cooling medium analogously to the cooling curve of the slowly solidifying cast strand 6 to be maintained replace.

Claims (6)

1. Device for cooling cast steel strands, characterised by the heat of the cas strand (6) being removed in the secondary cooling zones exclusively by means of internally cooled metallic structural elements that, at short range, contain or support and/or guide the castr strand (6) with the coolant being circulated and the structural wall (15) facing the cast strand (6) having cavities (22) over its inner surface (18) to reduce the heat resistance, and the inner surface (18) being composed of a multiplicity of flutes whose width and depth are less than 1 mm.
2. Cooling device according to claim 1, characterised by the inner surface (18) of the structural wall (15) having a capillary structure (19) similar to a socalled heat-conducting tube.
3. Cooling device according to claims 1 and 2, characterised by the structural element being a support roller (4) whose hollow bearing journals (20, 21) are designed to supply and/or discharge liquid cooling media or cooling media in the form of vapour (14) and there being a distance of between three and five millimetres from one support roller (4) to the next support roller (4).
4. Cooling device according to claims 1 to 3, characterised by the cavities (22) in the structural element wall (15) featuring a quasi-undulating progression (24) within the longitudinal cross- section with the capillary structure (19).
5. Cooling device according to claims 1 to 4, characterised by several support rollers (4) with their cooland discharge bearing journals (25) being connected to a first coler (26) in the heat- dissipating area (27) and the coolant supply bearing journals (25) being connected to a second cooler (28) with a pump (30) being interposed in a low-temperature (29) area.
6. Cooling device according to claims 1 to 5, characterised by the first cooler (26) extending approximately parallel to the cast strand (6).
EP82102333A 1981-03-31 1982-03-20 Device for cooling steel strands Expired EP0062209B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82102333T ATE10450T1 (en) 1981-03-31 1982-03-20 COOLING DEVICE FOR STEEL CASTING STRIPS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112673A DE3112673C2 (en) 1981-03-31 1981-03-31 Cooling device for metal, in particular for cast steel strands
DE3112673 1981-03-31

Publications (2)

Publication Number Publication Date
EP0062209A1 EP0062209A1 (en) 1982-10-13
EP0062209B1 true EP0062209B1 (en) 1984-11-28

Family

ID=6128780

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Application Number Title Priority Date Filing Date
EP82102333A Expired EP0062209B1 (en) 1981-03-31 1982-03-20 Device for cooling steel strands

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US (1) US4452298A (en)
EP (1) EP0062209B1 (en)
JP (1) JPS57177867A (en)
AT (1) ATE10450T1 (en)
DE (1) DE3112673C2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406731C2 (en) * 1984-02-24 1986-07-24 Mannesmann AG, 4000 Düsseldorf Method and device for the continuous casting of metals, in particular steel
US4799536A (en) * 1987-09-16 1989-01-24 Battelle Development Corporation Sheet caster cooling
JPH0259151A (en) * 1988-08-25 1990-02-28 Kuroki Kogyosho:Kk Continuous casting method
IT1248157B (en) * 1991-05-10 1995-01-05 Danieli Off Mecc FOOT ROLLERS FOR CONTINUOUS CASTING
CN1093836C (en) * 1999-09-09 2002-11-06 兖州矿业(集团)有限责任公司常州科学技术开发研究所 Continuous drafter
KR101988014B1 (en) 2012-04-18 2019-06-13 삼성디스플레이 주식회사 Method for fabricating array subtrate and fabrication apparatus used therefor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE913697C (en) * 1944-03-21 1954-06-18 Hermann Berstorff Maschb Ansta Roller for processing rubber, plastic or the like with helical guide channels for the heating or coolant provided inside
GB1027719A (en) * 1963-12-02
DE1908763B2 (en) * 1969-02-17 1971-06-16 Mannesmann AG, 4000 Dusseldorf ROLLS FOR COOLING A STRAND IN A CONTINUOUS CASTING PLANT
FR2341387A2 (en) * 1976-02-18 1977-09-16 Fives Cail Babcock INTERNAL COOLING ROLLER
US4197900A (en) * 1978-03-16 1980-04-15 Beizerov Semen M Furnace for vacuum arc melting of highly reactive metals
AT357714B (en) * 1978-08-03 1980-07-25 Voest Alpine Ag CONTINUOUS ROLL FOR A CONTINUOUS CASTING SYSTEM

Also Published As

Publication number Publication date
ATE10450T1 (en) 1984-12-15
JPS57177867A (en) 1982-11-01
EP0062209A1 (en) 1982-10-13
DE3112673A1 (en) 1982-10-28
DE3112673C2 (en) 1983-01-05
US4452298A (en) 1984-06-05

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