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EP1313579B1 - Continuous casting installation comprising a soft reduction section - Google Patents

Continuous casting installation comprising a soft reduction section Download PDF

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Publication number
EP1313579B1
EP1313579B1 EP01969503A EP01969503A EP1313579B1 EP 1313579 B1 EP1313579 B1 EP 1313579B1 EP 01969503 A EP01969503 A EP 01969503A EP 01969503 A EP01969503 A EP 01969503A EP 1313579 B1 EP1313579 B1 EP 1313579B1
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EP
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Prior art keywords
pressure
soft
segment
billet
mode
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EP01969503A
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German (de)
French (fr)
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EP1313579A1 (en
Inventor
Werner Rahmfeld
Jacob Wetter
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SMS Siemag AG
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SMS Demag AG
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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
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the method and the corresponding device is mainly in the horizontal part of the strand guide of the continuous casting installed and serves to improve the quality of the structure and the surface quality of the cast product.
  • the soft reduction effect is achieved by reducing the strand thickness in the range its solidification with molten core up to the top of the liquid sump achieved.
  • the range in which soft-reduction has a significant impact the inner quality of the strand is in the solidification at FS: 0.3 to 0.8, accordingly a length position on the solidification paths.
  • the soft-reduction, the specifically in small steps performed thickness reduction in the range mentioned demonstrably reduces the segregation tendency in the melt.
  • the zone in which the strand thickness is reduced must be changeable in the longitudinal position of the strand.
  • the clamping cylinder used in the support segments.
  • the support segments are in Conveniently set for soft-reduction position to pass on Strand to make targeted thickness reduction. This procedure is practical fully processed and referred to as dynamic soft reduction, which, however, requires a lot of effort on the part of the technical implementation is.
  • the invention is based on the object, starting from the aforementioned state technology, a method and an apparatus for continuous casting of slabs or blocks, in particular of thin slabs, in the preamble of claim 1 type, which is a highly effective soft-reduction with reduced Expenditure of technical means with high quality of the result allows.
  • the process of the invention is that of the practical operation gained knowledge that a solidified part of the strand, if it enters the range of soft-reduction, not deformed may be because otherwise the support rollers or pressure rollers or their bearings or the Scaffolding construction of the segments would be damaged, especially then if several segments form the soft-reduction area and are conically set are.
  • Such a case may, for example, occur when the casting speed changes or as a result of a business interruption. in such a case got to then from the clamping pressure for soft-reduction, the hard pressure, to soft printing with preferably switched over 40% of the hard pressure at the outlet of the strand can be.
  • this conversion takes place automatically by hard pressure Soft pressure - and possibly vice versa - by determining a pressure increase pulse, in the Klemmzylindem created by the occurrence of non-deformable solidified strand in the conically set segment.
  • An embodiment of the method provides that during ongoing operation with Hard pressure of the soft reduction section, when reaching the upper limit or Switched to soft pressure, and vice versa while running Operating condition with soft pressure when reaching the lower pressure, limit or Switching value is switched to hard pressure.
  • the method according to the invention is further developed in that Inlet of a non-deformable, solidified strand part in one for hard pressure conically adjusted segment due to the resulting pressure rise pulse in the Klemmzylindem a switch from hard to soft pressure he follows.
  • the clamping cylinders are primarily with soft-reduction printing, the so-called Hard pressure, applied, with each movement of the cylinder piston a Pressure change causes.
  • a pressure sensor on the cylinder ensures that the Pressure increase in the cylinder is used to switch to the soft pressure.
  • a check valve by a relief valve partially open, allowing the segment to yield in the hydraulic circuit that is, the segment jaw width may change and solidify Strang stained the segment can pass under soft pressure.
  • an embodiment of the method according to the invention provides that after switching a segment to a soft-pressure operating state for a solidified strand part, in the case of the following inlet one not solidified strand part into the segment a print query is started, in short, intermittent intervals of soft pressure on hard - and vice versa - is switched and it is checked whether the pressures unchanged remain, or whether they are above or below the respective border or Switching value and that depending on the pressure test the setting on hard pressure or soft pressure. This measure becomes an wide opening of the segment due to the ferrostatic pressure of the melt prevented.
  • a further embodiment of the method according to the invention provides that all support segments in the soft-reduction area and in the behind Segments up to the end of the machine subjected to the intermittent pressure scan become. This ensures a uniform quality of the cast product.
  • An expedient embodiment of the method provides that a strand section is determined in particular in the horizontal part of the continuous casting, in which for the operating conditions of the casting operation, as well as for the steel grades used, the soft-reduction conditions apply.
  • the particular strand support section particular care must be taken that all the support segments are individually adjustable with the requisite conicity such that the continuous strand receives the deformation required for the soft reduction.
  • the hydraulically adjustable support segments are set individually against mechanical stops with a predetermined thickness to a predetermined level of soft reduction. The mechanical stops prevent too close movement of the support rollers and thus damage the entire support structure.
  • An apparatus for continuous casting of slabs or blocks, in particular of thin slabs in a continuous casting plant comprises a strand guide with a soft reduction section with pressure or support rollers, individually or as a Segment by means of hydraulic cylinders with change of the clamping cylinder pressure against each other Stepless and limited by stops with a clamping force can be acted upon.
  • a hydraulic circuit with a pressure sensor and provided by this controllable pressure changeover valve and arranged in the circuit block valve, a control valve and a relief valve, and with a pipe rupture protection comprising an overpressure protection with a check valve for application a hard-pressure clamping force within a range of the soft-reduction path, in which the strand is not yet solidified, or a clamping force with soft pressure within the range of the soft reduction range, in which the strand is solidified, and for the purpose of switching from hard to soft printing and vice versa.
  • the clamping force is provided by the hydraulic cylinders both over the frame top as well as over the frame base evenly in the Pressure rollers initiated.
  • FIG 1 the part of a support segment 1 for the cast in a continuous casting plant Strand 2, for example, to see a thin slab.
  • the support segment is located within the soft reduction section of the strand guide and points Pressure or support rollers 3, 4, which individually, or as in the present case, as Segment by means of the hydraulic cylinder 7 against each other continuously with a Clamping force is applied.
  • the numeral 30 denotes a mechanical stop of intended thickness, against which the lower segment part 6 against the segment frame upper part. 5 by the train of the piston rod of the cylinder 7 to the degree of soft-reduction can be adjusted individually.
  • the thickness of the cast thin slab in reduced in small increments to reduce segregation in the strand interior and to improve the surface finish.
  • the soft reduction range includes at least large lengths of the strand with molten core up to to the top of the liquid swamp.
  • Fig. 1 shows the working pressure of the hydraulic Circuit tapped above and below the piston in the hydraulic cylinder 7 and evaluated by the pressure sensor 10.
  • This pressure sensor 10 on the cylinder 7 ensures that an increase in pressure in the cylinder, for example, to switch used by Harttik on the soft print.
  • the clamping cylinders 7 are primarily at the soft-reduction pressure, i. with hard print, and are connected to a check valve 12, e.g. Pipe rupture or unlockable check valve in conjunction with an overpressure safety device 15 connected such that each movement of the cylinder piston causes a pressure change, which - as I said - in case of pressure increase the cylinder is used to switch to the soft pressure.
  • a check valve 12 e.g. Pipe rupture or unlockable check valve in conjunction with an overpressure safety device 15 connected such that each movement of the cylinder piston causes a pressure change, which - as I said - in case of pressure increase the cylinder is used to switch to the soft pressure.
  • the check valve 12 by the relief valve 14 so that the segment can yield, i.e., that the Segment jaw width can change, causing the solidified strand piece 2 the segment 1 can pass under soft pressure.
  • Figure 2 shows a segment 1 for the inlet of the strand 2 with a through Core 8 of liquid melt not closed strand shells 2 '.
  • the Segment frame includes the segment frame top 5 and the segment frame bottom 6, by hydraulic cylinders 7, 7 'against the ferrostatic Pressure of the strand shell 2 'and the liquid Schmelzenkems 8 with relatively high Force to be forced together.
  • the segment 1 has the Pressure guide rollers 2 and 4, which, for example, partially provided with drives are, as is well known.
  • the hydraulic cylinders 7 ' are with soft pressure and the hydraulic cylinder 7 applied with hard pressure in the context of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Fluid-Damping Devices (AREA)
  • Braking Arrangements (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method and a device for the continuous casting of slabs or ingots, in particular of thin slabs in a continuous casting installation. Said installation comprises a soft reduction section in a continuous casting guide under the mould. The soft reduction section contains pressure rollers and support roller (3, 4), which are continuously restrained in relation to one another, either individually or as a segment (1), by means of hydraulic cylinders (7, 7') and are restrained in a limiting manner by stops (30). The installation uses a hard-pressure restraining force in an area of the soft reduction section that has not yet completely solidified and a soft-pressure restraining force in an area of the soft reduction section that has completely solidified. Threshold and changeover values for the hard and soft-pressure are defined in the segment is restrained using hard-pressure, such a way that if the restraining force lies below the threshold or changeover value, and if the restraining force lies above the threshold or changeover value the segment is restrained using soft-pressure.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen in einer Stranggießanlage, umfassend in einer Strangführung unterhalb der Kokille eine Soft-Reduction-Strecke mit Druckrollen bzw. Stützrollen, die einzeln oder als Segment mittels Hydraulik-Zylindern gegeneinander stufenlos sowie durch Anschläge begrenzbar mit einer veränderbaren Klemmkraft beaufschlagt sind.The invention relates to a method and apparatus for continuous casting of Slabs or blocks, in particular of thin slabs in a continuous casting plant, comprising a soft reduction section in a strand guide below the mold with pressure rollers or support rollers, individually or as a segment by means of hydraulic cylinders infinitely variable as well as limited by stops with a variable clamping force is applied.

Die Mehrzahl der zzt. im Betrieb befindlichen oder in Betrieb gehenden Stranggießanlagen, insbesondere zum Gießen von Dünnbrammen, verwirklichen eine Betriebstechnik mit Soft-Reduction. Das Verfahren und die entsprechende Vorrichtung wird hauptsächlich im Horizontalteil der Strangführung der Stranggießanlagen installiert und dient einer Verbesserung der Gefügequalität und der Oberflächenqualität des Gießprodukts.The majority of czt. continuous casting plants in operation or in operation, especially for casting thin slabs, realize one Operating technology with soft-reduction. The method and the corresponding device is mainly in the horizontal part of the strand guide of the continuous casting installed and serves to improve the quality of the structure and the surface quality of the cast product.

Der Soft-Reduction-Effekt wird durch Reduzierung der Strangdicke im Bereich seiner Erstarrung mit schmelzflüssigern Kern bis zur Spitze des flüssigen Sumpfes erzielt. Der Bereich, in weichem die Soft-Reduction einen signifikanten Einfluss auf die Stranginnenqualität ausübt, liegt in der Erstarrung bei FS: 0,3 bis 0,8, entsprechend einer Längenposition auf dem Erstarrungswege. Die Soft-Reduction, die gezielt in kleinen Schritten durchgeführte Dickenreduzierung im genannten Bereich vermindert nachweisbar die Seigerungstendenz in der Schmelze.The soft reduction effect is achieved by reducing the strand thickness in the range its solidification with molten core up to the top of the liquid sump achieved. The range in which soft-reduction has a significant impact the inner quality of the strand is in the solidification at FS: 0.3 to 0.8, accordingly a length position on the solidification paths. The soft-reduction, the specifically in small steps performed thickness reduction in the range mentioned demonstrably reduces the segregation tendency in the melt.

Um in den wirksamen Bereich der Soft-Reduction bei unterschiedlichen Betriebszuständen, bspw. hervorgerufen durch Gießgeschwindigkeitsveränderung bzw. Stillstände, zu gelangen, muss die Zone, in welcher die Strangdicke reduziert wird, in der Längsposition des Stranges veränderbar sein. Zu diesem Zweck werden positionsgeregelte Klemmzylinder in den Stützsegmenten eingesetzt. To enter the effective range of soft-reduction in different operating conditions, For example, caused by casting speed change or Stoppages, the zone in which the strand thickness is reduced must be changeable in the longitudinal position of the strand. For this purpose will be position-controlled clamping cylinder used in the support segments.

Durch Ermittlung der Lage der Sumpfspitze, rechnerisch bzw. durch Messung der Druckänderung des Stranges auf die Druckrollen, werden die Stützsegmente in der für Soft-Reduction günstige Position konisch eingestellt, um am durchlaufenden Strang gezielte Dickenreduktion vorzunehmen. Dieses Verfahren ist praktisch vollständig durcheniwickelt und wird als dynamische Soft-Reduction bezeichnet, die jedoch seitens der technischen Verwirklichung mit hohem Aufwand verbunden ist.By determining the position of the sump tip, by calculation or by measuring the Pressure change of the strand on the pressure rollers, the support segments are in Conveniently set for soft-reduction position to pass on Strand to make targeted thickness reduction. This procedure is practical fully processed and referred to as dynamic soft reduction, which, however, requires a lot of effort on the part of the technical implementation is.

Aus dem Dokument WO-A-98/50 185 ist ein Verfahren und eine Vorrichtung zum Erzeugen von Brammen aus Stahl mit einer Stranggießmaschine mit dynamischer Soft-Reduction bekannt. Der gegossene Strang verlässt die Kokille mit einer von der Strangschale umschlossenen Flüssigschmelze und durchläuft eine nachgeschaltete Strangführung, wobei die Maulweite von in Gerüsten gelagerten Führungsrollen durch Unter- und Oberrahmen verbundene Verstellelemente stufenlos eingestellt wird. Die dynamische Soft-Reduction wird hier mit folgenden Schritten durchgeführt:

  • a) die Maulweite wird mit einer Oszillation um eine vorgebbare Mittellinie der Maulweite in der Weise geändert, dass die dynamischen Einflüsse auf die Führungsrollen vernachlässigbar klein sind,
  • b) die Amplitude der Maulweiten-Oszillation wird in einer Größe eingestellt die keine plastische Verformung der Strangschale hervorruft,
  • c) die aktuelle Maulweite wird erfasst;
  • d) gleichzeitig wird die Stellkraft der Verstellelemente sowie die Amplitude der Stellkraft ermittelt und
  • e) bei steigender Amplitude der Stellkraft wird die Maulweite auf ein vorgebbares Maß eingestellt und/oder über mindestens ein Verstellelement druckgeregelt geführt.
    • From the document WO-A-98/50 185 a method and an apparatus for producing slabs of steel with a continuous casting machine with dynamic soft-reduction is known. The cast strand leaves the mold with a liquid melt enclosed by the strand shell and passes through a downstream strand guide, the jaw width of guide rollers mounted in stands being continuously adjusted by adjusting elements connected to the lower and upper frame. The dynamic soft reduction is carried out here with the following steps:
  • a) the jaw width is changed by an oscillation about a predeterminable center line of the jaw width in such a way that the dynamic influences on the guide rollers are negligibly small,
  • b) the amplitude of the gap-width oscillation is set at a size that does not cause plastic deformation of the strand shell,
  • c) the current jaw width is recorded;
  • d) simultaneously, the force of the adjusting and the amplitude of the force is determined and
  • e) with increasing amplitude of the actuating force, the jaw width is set to a predeterminable degree and / or pressure-controlled via at least one adjusting element.

    • Der Erfindung liegt die Aufgabe zugrunde, ausgehend vom vorgenannten Stand der Technik, ein Verfahren und eine Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen der im Oberbegriff von Anspruch 1 genannten Art anzugeben, welche eine hochwirksame Soft-Reduction mit verringertem Aufwand an technischen Mitteln bei hoher Qualität des Ergebnisses ermöglicht.The invention is based on the object, starting from the aforementioned state technology, a method and an apparatus for continuous casting of slabs or blocks, in particular of thin slabs, in the preamble of claim 1 type, which is a highly effective soft-reduction with reduced Expenditure of technical means with high quality of the result allows.

    Zur Lösung der o. g. Aufgabe wird erfindungsgemäß vorgeschlagen, dass innerhalb eines Bereiches der Soft-Reduction-Strecke, in welchem der Strang noch nicht durcherstarrt ist, mit einer Klemmkraft mit Hartdruck, und innerhalb des Bereichs der Soft-Reduction-Strecke, in weichem der Strang durcherstarrt ist, mit einer Klemmkraft mit Weichdruck gearbeitet wird, dass Grenz- bzw. Umschaltwerte für Hart- und Weichdruck definiert werden, und dass bei einer Klemmkraft unterhalb des Grenz- bzw. Umschaltwertes die Segmentklemmung mit Weichdruck durchgeführt wird. Dem erfindungsgemäßen Verfahren liegt die aus dem praktischen Betrieb gewonnene Erkenntnis zugrunde, dass ein durcherstarrter Teil des Stranges, falls er in den Bereich der Soft-Reduction gelangt, nicht verformt werden darf, weil sonst die Stützrollen bzw. Druckrollen oder deren Lager oder die Gerüstkonstruktion der Segmente Schaden nehmen würden, vor allem dann, wenn mehrere Segmente den Soft-Reduction-Bereich bilden und konisch eingestellt sind. Ein solcher Fall kann bspw. eintreten, wenn sich die Gießgeschwindigkeit ändert bzw. als Folge einer Betriebsunterbrechung. in einem solchen Fall muss dann vom Klemmdruck für Soft-Reduction, dem Hartdruck, auf Weichdruck mit vorzugsweise 40% des Hartdruckes bei der Auslaufstrecke des Stranges umgeschaltet werden können.To solve the o. Task is inventively proposed that within an area of the soft-reduction track where the strand is still is not solidified, with a clamping force with hard pressure, and within the range the soft reduction range in which the strand is solidified with a clamping force is used with soft pressure that limit or switching values be defined for hard and soft pressure, and that at a clamping force below the limit or switchover value the segment clamping with soft pressure is carried out. The process of the invention is that of the practical operation gained knowledge that a solidified part of the strand, if it enters the range of soft-reduction, not deformed may be because otherwise the support rollers or pressure rollers or their bearings or the Scaffolding construction of the segments would be damaged, especially then if several segments form the soft-reduction area and are conically set are. Such a case may, for example, occur when the casting speed changes or as a result of a business interruption. in such a case got to then from the clamping pressure for soft-reduction, the hard pressure, to soft printing with preferably switched over 40% of the hard pressure at the outlet of the strand can be.

    Im Falle der Erfindung erfolgt diese Umstellung selbsttätig von Hartdruck auf Weichdruck - und gegebenenfalls umgekehrt - durch Ermittlung eines Druck-Anstiegimpulses, der in den Klemmzylindem entsteht durch das Eintreten des nicht verformbaren durcherstarrten Stranges in das konisch eingestellte Segment.In the case of the invention, this conversion takes place automatically by hard pressure Soft pressure - and possibly vice versa - by determining a pressure increase pulse, in the Klemmzylindem created by the occurrence of non-deformable solidified strand in the conically set segment.

    Eine Ausgestaltung des Verfahrens sieht vor, dass bei laufendem Betrieb mit Hartdruck der Soft-Reduction-Strecke, beim Erreichen des oberen Grenz- bzw. Umschaltwertes auf Weichdruck umgeschaltet, und umgekehrt bei laufendem Betriebszustand mit Weichdruck bei Erreichen des unteren Druck-, Grenz- bzw. Umschaltwertes auf Hartdruck umgeschaltet wird.An embodiment of the method provides that during ongoing operation with Hard pressure of the soft reduction section, when reaching the upper limit or Switched to soft pressure, and vice versa while running Operating condition with soft pressure when reaching the lower pressure, limit or Switching value is switched to hard pressure.

    Das Verfahren nach der Erfindung ist dahingehend weiterentwickelt, dass bei Einlauf eines nicht verformbaren, durcherstarrten Strangteils in ein für Hartdruck konisch eingestelltes Segment aufgrund des dabei entstehenden Druckanstieg-Impulses in den Klemmzylindem eine Umschaltung von Hartdruck auf Weichdruck erfolgt.The method according to the invention is further developed in that Inlet of a non-deformable, solidified strand part in one for hard pressure conically adjusted segment due to the resulting pressure rise pulse in the Klemmzylindem a switch from hard to soft pressure he follows.

    Die Klemmzylinder sind primär mit Soft-Reduction-Druck, dem sogenannten Hartdruck, beaufschlagt, wobei jede Wegbewegung des Zylinderkolbens eine Druckänderung hervorruft. Ein Drucksensor am Zylinder sorgt dafür, dass die Druckerhöhung im Zylinder zum Umschalten auf den Weichdruck genutzt wird. Zur praktischen Durchführung wird ein Sperrventil durch ein Entlastungsventil partiell geöffnet, so dass das Segment im hydraulischen Schaltkreis nachgeben kann, d.h., dass sich die Segment-Maulweite ändern und das durcherstarrte Strangstück das Segment unter Weichdruck passieren kann. The clamping cylinders are primarily with soft-reduction printing, the so-called Hard pressure, applied, with each movement of the cylinder piston a Pressure change causes. A pressure sensor on the cylinder ensures that the Pressure increase in the cylinder is used to switch to the soft pressure. For practical implementation, a check valve by a relief valve partially open, allowing the segment to yield in the hydraulic circuit that is, the segment jaw width may change and solidify Strangstück the segment can pass under soft pressure.

    Ferner sieht eine Ausgestaltung des Verfahrens nach der Erfindung vor, dass nach Umschalten eines Segments auf einen Betriebszustand mit Weichdruck für einen durcherstarrten Strangteil, im Falle des folgenden Einlaufs eines nicht durcherstarrten Strangteils in das Segment eine Druckabfrage gestartet wird, wobei in kurzen, taktweisen Zeitabständen von Weichdruck auf Hartdruck - und umgekehrt - umgeschaltet wird und dabei geprüft wird, ob die Drücke unverändert bleiben, oder ob sie oberhalb bzw. unterhalb des jeweiligen Grenz- bzw. Umschaltwertes liegen und dass in Abhängigkeit der Druckprüfung die Einstellung auf Hartdruck bzw. Weichdruck erfolgt. Durch diese Maßnahme wird ein zu weites Öffnen des Segmentes durch den ferrostatischen Druck der Schmelze verhindert.Furthermore, an embodiment of the method according to the invention provides that after switching a segment to a soft-pressure operating state for a solidified strand part, in the case of the following inlet one not solidified strand part into the segment a print query is started, in short, intermittent intervals of soft pressure on hard - and vice versa - is switched and it is checked whether the pressures unchanged remain, or whether they are above or below the respective border or Switching value and that depending on the pressure test the setting on hard pressure or soft pressure. This measure becomes an wide opening of the segment due to the ferrostatic pressure of the melt prevented.

    Eine weitere Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, dass alle Stützsegmente im Soft-Reduction-Bereich und in den dahinter liegenden Segmenten bis zum Maschinenende der taktweisen Druckabfrage unterzogen werden. Damit wird eine gleichmäßige Qualität des Gußproduktes sichergestellt.A further embodiment of the method according to the invention provides that all support segments in the soft-reduction area and in the behind Segments up to the end of the machine subjected to the intermittent pressure scan become. This ensures a uniform quality of the cast product.

    Eine zweckmäßige Ausgestaltung des Verfahrens sieht vor, dass insbesondere im Horizontalteil der Stranggießanlage eine Strangstrecke bestimmt wird, in welcher für die Betriebszustände des Gießbetriebes, sowie für die verwendeten Stahlsorten, die Soft-Reduction-Bedingungen zutreffen. Dabei ist in der bestimmten Strangstützstrecke darauf besonders zu achten, dass alle Stützsegmente einzeln mit erforderlicher Konizität derart einstellbar sind, dass der durchlaufende Strang die für die Soft-Reduction erforderliche Verformung erhält.
    Zu diesem Zweck kann mit dem Verfahren vorgesehen sein, dass die hydraulisch einstellbaren Stützsegmente gegen mechanische Anschläge mit vorbestimmter Dicke auf ein vorgegebenes Maß der Soft-Reduction einzeln eingestellt werden. Dabei verhindern die mechanischen Anschläge ein zu enges Zusammenfahren der Stützrollen und damit eine Beschädigung der gesamten Stützkonstruktion.     An expedient embodiment of the method provides that a strand section is determined in particular in the horizontal part of the continuous casting, in which for the operating conditions of the casting operation, as well as for the steel grades used, the soft-reduction conditions apply. In this case, in the particular strand support section, particular care must be taken that all the support segments are individually adjustable with the requisite conicity such that the continuous strand receives the deformation required for the soft reduction.
    For this purpose, it can be provided with the method that the hydraulically adjustable support segments are set individually against mechanical stops with a predetermined thickness to a predetermined level of soft reduction. The mechanical stops prevent too close movement of the support rollers and thus damage the entire support structure.

    Eine Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen in einer Stranggießanlage, umfasst eine Strangführung mit einer Soft-Reduction-Strecke mit Druck- bzw. Stützrollen, die einzeln oder als Segment mittels Hydraulik-Zylindem mit Änderung des Klemmzylinderdruckes gegeneinander stufenlos sowie durch Anschläge begrenzbar mit einer Klemmkraft beaufschlagbar sind. Gemäß der Erfindung ist eine hydraulische Schaltung mit einem Drucksensor und mit von diesem steuerbaren Druckumschaltventil vorgesehen sowie mit in dessen Schaltkreis angeordnetem Sperrventil, einem Steuerventil und einem Entlastungsventil, sowie mit einer Rohrbruchsicherung, umfassend eine Überdrucksicherung mit einem Rückschlagventil zwecks Aufbringung einer Klemmkraft mit Hartdruck innerhalb eines Bereichs der Soft-Reduction-Strecke, in welchem der Strang noch nicht durcherstarrt ist, bzw. einer Klemmkraft mit Weichdruck innerhalb des Bereichs der Soft-Reduction-Strecke, in welchem der Strang durcherstarrt ist, sowie zwecks Umschaltung von Hartdruck auf Weichdruck und umgekehrt. Die Klemmkraft wird von den Hydraulik-Zylindern sowohl über das Rahmenoberteil als auch über das Rahmenunterteil gleichmäßig in die Druckrollen eingeleitet.An apparatus for continuous casting of slabs or blocks, in particular of thin slabs in a continuous casting plant, comprises a strand guide with a soft reduction section with pressure or support rollers, individually or as a Segment by means of hydraulic cylinders with change of the clamping cylinder pressure against each other Stepless and limited by stops with a clamping force can be acted upon. According to the invention, a hydraulic circuit with a pressure sensor and provided by this controllable pressure changeover valve and arranged in the circuit block valve, a control valve and a relief valve, and with a pipe rupture protection, comprising an overpressure protection with a check valve for application a hard-pressure clamping force within a range of the soft-reduction path, in which the strand is not yet solidified, or a clamping force with soft pressure within the range of the soft reduction range, in which the strand is solidified, and for the purpose of switching from hard to soft printing and vice versa. The clamping force is provided by the hydraulic cylinders both over the frame top as well as over the frame base evenly in the Pressure rollers initiated.

    Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles. Es zeigen:

    Figur 1
    einen Teil eines Stützsegmentes für den gegossenen Strang in rein schematischer Darstellung, mit einem zugeordneten Schaltschema zur Durchführung des Verfahrens nach der Erfindung;
    Figur 2
    ein Stützsegment in geöffneter Position zum Einlauf eines Stranges mit teilweise flüssigem Kern im Bereich der Sumpfspitze.
    Further details, features and advantages of the invention will become apparent from the following explanation of an embodiment schematically illustrated in the drawings. Show it:
    FIG. 1
    a part of a support segment for the cast strand in a purely schematic representation, with an associated circuit diagram for carrying out the method according to the invention;
    FIG. 2
    a support segment in the open position to the inlet of a strand with partially liquid core in the area of the sump tip.

    In Figur 1 ist der Teil eines Stützsegmentes 1 für den in einer Stranggießanlagegegossenen Strang 2, bspw. einer Dünnbramme zu sehen. Das Stützsegment befindet sich innerhalb der Soft-Reduction-Strecke der Strangführung und weist Druck- bzw. Stützrollen 3, 4 auf, die einzeln, oder wie im vorliegenden Fall, als Segment mittels des Hydraulik-Zylinders 7 gegeneinander stufenlos mit einer Klemmkraft beaufschlagt wird.In Figure 1, the part of a support segment 1 for the cast in a continuous casting plant Strand 2, for example, to see a thin slab. The support segment is located within the soft reduction section of the strand guide and points Pressure or support rollers 3, 4, which individually, or as in the present case, as Segment by means of the hydraulic cylinder 7 against each other continuously with a Clamping force is applied.

    Mit der Ziffer 30 ist ein mechanischer Anschlag vorgesehener Dicke bezeichnet, gegen welchen der Segmentunterteil 6 gegen den Segmentrahmen-Oberteil 5 durch den Zug der Kolbenstange des Zylinders 7 auf das Maß der Soft-Reduction einzeln eingestellt werden kann.The numeral 30 denotes a mechanical stop of intended thickness, against which the lower segment part 6 against the segment frame upper part. 5 by the train of the piston rod of the cylinder 7 to the degree of soft-reduction can be adjusted individually.

    In der Soft-Reduction-Strecke wird die Dicke der gegossenen Dünnbramme in kleinen Schritten reduziert, um Seigerungen im Stranginneren zu vermindern und um die Oberflächengüte zu verbessern. Die Soft-Reduction-Strecke umfaßt zumindest große Längenbereiche des Stranges mit schmelzflüssigem Kern bis zur Spitze des flüssigen Sumpfes. Um die Anstellung der Stützsegmente an die infolge unterschiedlicher Betriebsbedingungen jeweils veränderte Lage der Sumpfspitze anzupassen, ist eine spezielle hydraulische Schaltung vorgesehen.In the soft-reduction section, the thickness of the cast thin slab in reduced in small increments to reduce segregation in the strand interior and to improve the surface finish. The soft reduction range includes at least large lengths of the strand with molten core up to to the top of the liquid swamp. To the employment of the support segments to the As a result of different operating conditions each changed position of To adjust sump tip, a special hydraulic circuit is provided.

    Wie das Schaltschema zu Fig. 1 zeigt, wird der Arbeitsdruck der hydraulischen Schaltung oberhalb und unterhalb des Kolbens im Hydraulikzylinder 7 abgegriffen und vom Drucksensor 10 ausgewertet. Dieser Drucksensor 10 am Zylinder 7 sorgt dafür, dass eine Druckerhöhung im Zylinder bspw. zum Umschalten von Hartdruck auf den Weichdruck genutzt wird. Zu diesem Zweck steht der Drucksensor 10 mit dem Druckumschaltventil 11 über Signalleitungen in Verbindung.As the circuit diagram of Fig. 1 shows, the working pressure of the hydraulic Circuit tapped above and below the piston in the hydraulic cylinder 7 and evaluated by the pressure sensor 10. This pressure sensor 10 on the cylinder 7 ensures that an increase in pressure in the cylinder, for example, to switch used by Hartdruck on the soft print. For this purpose stands the Pressure sensor 10 with the pressure changeover valve 11 via signal lines in conjunction.

    Die Klemmzylinder 7 sind primär mit dem Soft-Reduction-Druck, d.h. mit Hartdruck, beaufschlagt, und sind mit einem Sperrventil 12, z.B. Rohrbruchsicherung oder entsperrbarem Rückschlagventil in Verbindung mit einer Überdrucksicherung 15 derart verbunden, dass jede Wegbewegung des Zylinderkolbens eine Druckveränderung hervorruft, die - wie gesagt - im Falle einer Druckerhöhung der Zylinder zum Umschalten auf den Weichdruck genutzt wird.The clamping cylinders 7 are primarily at the soft-reduction pressure, i. with hard print, and are connected to a check valve 12, e.g. Pipe rupture or unlockable check valve in conjunction with an overpressure safety device 15 connected such that each movement of the cylinder piston causes a pressure change, which - as I said - in case of pressure increase the cylinder is used to switch to the soft pressure.

    Im Falle des Weichdrucks wird andererseits das Sperrventil 12 durch das Entlastungsventil 14 geöffnet, so dass das Segment nachgeben kann, d.h., dass die Segment-Maulweite sich verändern kann, wodurch das durcherstarrte Strangstück 2 das Segment 1 unter Weichdruck passieren kann.In the case of soft pressure, on the other hand, the check valve 12 by the relief valve 14 so that the segment can yield, i.e., that the Segment jaw width can change, causing the solidified strand piece 2 the segment 1 can pass under soft pressure.

    Kommt zu einem anderen Zeitpunkt in das Segment 1 ein nicht durcherstarrter Strangbereich mit flüssigem Sumpf an, so würde das Segment 1, beaufschlagt mit Weichdruck, unter dem ferrostatischen Druck des Stranges 2 nachgeben und sich noch stärker öffnen, was nicht zulässig ist und eine Qualitätsminderung des Gießstranges verursacht.At another time in the segment 1 comes a not durcherstarrter Strand area with liquid sump on, so the segment 1, applied with soft pressure, give under the ferrostatic pressure of strand 2 and open up even more, which is not allowed and a decrease in quality caused by the cast strand.

    Um ein weiteres Öffnen des Segmentes 1 durch den ferrostatischen Druck des nicht erstarrten Stranges 2 zu vermeiden, wird in der hydraulischen Schaltung eine Druckabfrage gestartet, bei welcher in kurzen Zeitabständen mit Zeittakten das Steuerventil 13 von Weichdruck auf Hartdruck über den Drucksensor 10 umgeschaltet und das entsperrbare Rückschlagventil 12 geschlossen wird.To further open the segment 1 by the ferrostatic pressure of not to avoid stiffened strand 2, is in the hydraulic circuit started a print query in which at short intervals with clocks the control valve 13 of soft pressure to hard pressure on the pressure sensor 10th switched over and the pilot-operated check valve 12 is closed.

    Anschließend wird geprüft, ob der Hartdruck konstant bleibt, d.h., ob er unterhalb des Umschaltwertes bleibt oder ob er ansteigt. Bleibt der Druck unterhalb des Umschaltwertes, dann ist der Strang 2 nicht durcherstarrt und die Segmentklemmung benötigt Hartdruck.It is then checked whether the hard pressure remains constant, that is, whether it is below of the switching value remains or whether it rises. If the pressure remains below of the switching value, then the strand 2 is not solidified and the segment clamping requires hard pressure.

    Steigt jedoch der Druck über den Umschaltwert, dann ist der Strang 2 durcherstarrt und die Segmentklemmung muß auf Weichdruck umgestellt werden.However, if the pressure above the switching value, then the strand 2 is solidified and the segment clamping must be switched to soft pressure.

    Figur 2 zeigt ein Segment 1 für den Einlauf des Stranges 2 mit durch einen Kern 8 von flüssiger Schmelze nicht geschlossenen Strangschalen 2'. Der Segmentrahmen umfaßt das Segmentrahmen-Oberteil 5 und das Segmentrahmen-Unterteil 6, die durch Hydraulikzylinder 7, 7' gegen den ferrostatischen Druck der Strangschale 2' bzw. des flüssigen Schmelzenkems 8 mit relativ hoher Kraft zusammengezwungen werden. Hierfür besitzt das Segment 1 die Druckführungsrollen 2 bzw. 4, welche bspw. zum Teil mit Antrieben versehen sind, wie dies allgemein bekannt ist. Die Hydraulik-Zylinder 7' sind mit Weichdruck und die Hydraulik-Zylinder 7 mit Hartdruck im Sinne der Erfindung beaufschlagt.Figure 2 shows a segment 1 for the inlet of the strand 2 with a through Core 8 of liquid melt not closed strand shells 2 '. Of the Segment frame includes the segment frame top 5 and the segment frame bottom 6, by hydraulic cylinders 7, 7 'against the ferrostatic Pressure of the strand shell 2 'and the liquid Schmelzenkems 8 with relatively high Force to be forced together. For this segment 1 has the Pressure guide rollers 2 and 4, which, for example, partially provided with drives are, as is well known. The hydraulic cylinders 7 'are with soft pressure and the hydraulic cylinder 7 applied with hard pressure in the context of the invention.

    Claims (10)

    1. A method for continuously casting slabs or ingots, particularly thin slabs, in a continuous casting installation comprising a soft reduction section with press rollers and backup rollers (3, 4) which is situated in a billet guide underneath the mould, wherein the press rollers and backup rollers are mutually acted upon with a variable clamping force individually or as a segment (1) by means of hydraulic cylinders (7, 7'), namely in an infinitely variable fashion and limitable by means of limit stops (30), characterized in that a clamping force in accordance with the high-pressure mode is exerted within a region of the soft reduction section, in which the billet is not yet thoroughly solidified, and a clamping force in accordance with the low-pressure mode is exerted within the region of the soft reduction section, in which the billet is thoroughly solidified, in that limiting or changeover values for the high-pressure mode and the low-pressure mode are defined, and in that the segment clamping is carried out in the high-pressure mode if the clamping force lies below the limiting or changeover value and the segment clamping is carried out in the low-pressure mode above the limiting or changeover value.
    2. The method according to Claim 1, characterized in that a high-pressure casting mode in the soft reduction section is changed over to the low-pressure mode when the clamping force reaches an upper limiting or changeover value and, vice versa, a low-pressure casting mode is changed over to the high-pressure mode when the clamping force reaches a lower limiting or changeover value.
    3. The method according to Claim 1 or 2, characterized in that the introduction of a non-deformable, thoroughly solidified billet section into a conically adjusted high-pressure segment leads to a pressure rise pulse that, in turn, results in the clamping cylinders being changed over from the high-pressure mode to the low-pressure mode.
    4. The method according to at least one of Claims 1-3, characterized in that, after changing over a segment to the low-pressure operating mode for a thoroughly solidified billet section, a pressure inquiry is initiated if a billet section that is not thoroughly solidified is subsequently introduced into the segment, wherein the operating mode is changed over from the low-pressure mode to the high-pressure mode--and vice versa-within short cyclic intervals and it is checked whether the pressures remain unchanged or lie above or below the respective limiting or changeover value, and wherein the operating mode is adjusted to the high-pressure mode or the low-pressure mode in dependence on this pressure check.
    5. The method according to Claim 4, characterized in that all backup segments in the soft reduction section and in the ensuing segments up to the machine end are subjected to a cyclic pressure inquiry.
    6. The method according to at least one of Claims 1-5, characterized in that a billet section is determined, in which the soft reduction conditions apply to the operating modes of the casting installation, as well as to the steel types used, particularly in the horizontal section of the continuous casting installation.
    7. The method according to Claim 6, characterized in that all billet segments in the determined billet section can be individually adjusted with the required conicality in such a way that the billet passing through this section is subjected to the deformation required for the soft reduction.
    8. The method according to at least one of Claims 1-7, characterized in that the hydraulically adjustable backup segments are individually adjusted to a preset soft reduction value against mechanical limit stops of predetermined thickness (30).
    9. The method according to at least one of Claims 1-8, characterized in that the pressure in the low-pressure mode is adjusted to approximately 30 % - 50 % of the pressure in the high-pressure mode, for example, to 40 % of the pressure in the high-pressure mode.
    10. A device for continuously casting slabs or ingots, particularly thin slabs, in a continuous casting installation comprising a soft reduction section with press rollers and backup rollers (3, 4) which is situated in a billet guide, wherein the press rollers and backup rollers are mutually acted upon with a clamping force individually or as a segment (1) by means of hydraulic cylinders (7, 7'), namely in an infinitely variable fashion and limitable by means of limit stops (30), in order to change the clamping cylinder pressure, particularly for carrying out the method according to the invention, characterized in a hydraulic circuit with a pressure sensor (10) and a pressure changeover valve (11) that is controlled by the pressure sensor, a shut-off valve (12), a control valve (13) and a relief valve (14) that are arranged in the hydraulic circuit, and a pipe-break safety, wherein the device comprises an overpressure safety (15) with a check valve in order to exert a clamping force in accordance with the high-pressure mode within a region of the soft reduction section, in which the billet is not yet thoroughly solidified, and a clamping force in accordance with the low-pressure mode within the region of the soft reduction section, in which the billet is thoroughly solidified.
    EP01969503A 2000-08-26 2001-07-25 Continuous casting installation comprising a soft reduction section Expired - Lifetime EP1313579B1 (en)

    Applications Claiming Priority (3)

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    DE10042079 2000-08-26
    DE10042079A DE10042079A1 (en) 2000-08-26 2000-08-26 Continuous caster with soft reduction section
    PCT/EP2001/008574 WO2002018077A1 (en) 2000-08-26 2001-07-25 Continuous casting installation comprising a soft reduction section

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    EP1313579B1 true EP1313579B1 (en) 2004-06-16

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    JP (1) JP2004507363A (en)
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    DE102004002783A1 (en) 2004-01-20 2005-08-04 Sms Demag Ag Method and device for determining the position of the sump tip in the casting strand in the continuous casting of liquid metals, in particular of liquid steel materials
    CN100493772C (en) * 2005-07-28 2009-06-03 西安重型机械研究所 Hydraulic system for casting and rolling and dynamic soft reduction
    DE102005055530A1 (en) * 2005-11-22 2007-05-24 Sms Demag Ag Setting process for roller segment in continuous casting machine involves controlling setting elements of roller segments individually to coordinate side edges
    DE102006048511A1 (en) * 2006-10-13 2008-04-17 Sms Demag Ag Strand guiding device and method for its operation
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    CN103894572B (en) * 2014-04-10 2016-09-07 北京科技大学 A kind of continuous casting billet preprocess method
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    WO2002018077A1 (en) 2002-03-07
    ES2220803T3 (en) 2004-12-16
    KR100796638B1 (en) 2008-01-22
    ATE269180T1 (en) 2004-07-15
    DE10042079A1 (en) 2002-04-25
    AU2001289743A1 (en) 2002-03-13
    DE50102621D1 (en) 2004-07-22
    TR200401680T4 (en) 2004-08-23
    EP1313579A1 (en) 2003-05-28
    KR20030036708A (en) 2003-05-09
    US20040026066A1 (en) 2004-02-12
    US6871693B2 (en) 2005-03-29
    CA2420604C (en) 2010-01-19

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