EP1313579A1 - Continuous casting installation comprising a soft reduction section - Google Patents

Continuous casting installation comprising a soft reduction section

Info

Publication number
EP1313579A1
EP1313579A1 EP01969503A EP01969503A EP1313579A1 EP 1313579 A1 EP1313579 A1 EP 1313579A1 EP 01969503 A EP01969503 A EP 01969503A EP 01969503 A EP01969503 A EP 01969503A EP 1313579 A1 EP1313579 A1 EP 1313579A1
Authority
EP
European Patent Office
Prior art keywords
soft
pressure
printing
hard
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01969503A
Other languages
German (de)
French (fr)
Other versions
EP1313579B1 (en
Inventor
Werner Rahmfeld
Jacob Wetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1313579A1 publication Critical patent/EP1313579A1/en
Application granted granted Critical
Publication of EP1313579B1 publication Critical patent/EP1313579B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 invention relates to a method and a device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation, comprising in a strand guide below the mold a soft reduction section with pressure rollers or support rollers, which are used individually or as a segment by means of hydraulics -Cylinders are infinitely variable against each other and can be limited by stops with a clamping force.
  • the method and the corresponding device are mainly installed in the horizontal part of the strand guide of the continuous casting plants and serve to improve the structural quality and the surface quality of the cast product.
  • the soft reduction effect is achieved by reducing the strand thickness in the area of its solidification with a molten core up to the tip of the liquid sump.
  • the area in which the soft reduction has a significant influence on the internal strand quality lies in the solidification at FS: 0.3 to 0.8, corresponding to a length position on the solidification path.
  • the soft reduction, the targeted reduction in thickness in the specified area demonstrably reduces the tendency towards segregation in the melt.
  • the zone in which the strand thickness is reduced must be changeable in the longitudinal position of the strand.
  • position-controlled clamping cylinders are used in the support segments.
  • the invention has for its object to provide, starting from the aforementioned prior art, a method and an apparatus for the continuous casting of slabs or blocks, in particular thin slabs of the type mentioned in the preamble of claim 1, which is a highly effective soft reduction with reduced technical effort Allows for high quality results. '
  • the method according to the invention is based on the knowledge gained from practical operation that a solidified part of the strand, if it comes into the area of soft reduction, must not be deformed, because otherwise the support rollers or pressure rollers or their bearings or the Scaffold structure of the segments would be damaged, especially if several segments form the soft reduction area and are conical.
  • Such a case can occur, for example, if the casting speed changes or as a result of an interruption in operation.
  • the clamping pressure for soft reduction, the hard pressure to soft printing with preferably 40% of the hard pressure at the outlet section of the strand.
  • this changeover takes place automatically from hard printing to soft printing - and possibly vice versa - by determining a pressure rise pulse which arises in the clamping cylinders as a result of the non-deformable solidified strand entering the conically adjusted segment.
  • One embodiment of the method provides that when the hard reduction of the soft reduction section is in operation, when the upper limit or switchover value is reached, the switch is made to soft print, and vice versa when the soft pressure is in the operating state when the lower pressure, limit or Switchover value is switched to hard printing.
  • the method according to the invention is further developed in such a way that when a non-deformable, solidified strand part enters a segment that is conically set for hard printing, a changeover from hard printing to soft printing takes place due to the pressure rise impulse that occurs in the clamping cylinders.
  • the clamping cylinders are primarily subjected to soft reduction pressure, the so-called hard pressure, each movement of the cylinder piston causing a change in pressure.
  • a pressure sensor on the cylinder ensures that the pressure increase in the cylinder is used to switch to soft printing.
  • a shut-off valve is partially opened by a relief valve, so that the segment in the hydraulic circuit can yield, that is to say that the segment mouth width can change and the solidified strand piece can pass the segment under soft pressure.
  • an embodiment of the method according to the invention provides that after switching over a segment to an operating state with soft printing for a solidified strand part, in the case of the subsequent entry of a non-solidified strand part into the segment, a pressure query is started, with short, intermittent time intervals of Soft printing is switched to hard printing - and vice versa - and it is checked whether the pressures remain unchanged or whether they are above or below the respective limit or switchover value and that the setting for hard printing or soft printing is made depending on the pressure test. This measure prevents the segment from being opened too far by the ferrostatic pressure of the melt.
  • a further embodiment of the method according to the invention provides that all support segments in the soft reduction area and in the segments behind them are subjected to the intermittent pressure query until the end of the machine. This ensures a uniform quality of the cast product.
  • An expedient embodiment of the method provides that, in particular in the horizontal part of the continuous casting installation, a continuous section is determined in which the soft reduction conditions apply for the operating conditions of the casting operation and for the types of steel used.
  • a continuous section is determined in which the soft reduction conditions apply for the operating conditions of the casting operation and for the types of steel used.
  • special care must be taken to ensure that all support segments can be individually adjusted with the required taper in such a way that the continuous strand receives the deformation required for soft reduction.
  • the method can provide that the hydraulically adjustable support segments against mechanical stops with a predetermined thickness are individually adjusted to a predetermined degree of soft reduction.
  • the mechanical stops prevent the support rollers from moving too close together and thus damage the entire support structure.
  • a device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation comprising in a strand guide a soft-reduction section with pressure or support rollers which can be stepped individually or as a segment by means of hydraulic cylinders and can be limited by stops with one Clamping force can be applied, comprises a segment with support rollers or pressure rollers which can be pressed onto the strand and driven at an adjustable speed in a segment frame with upper frame part and lower frame part, as well as with hydraulic cylinders.
  • a hydraulic circuit is provided with a pressure sensor and with the pressure changeover valve controllable by it, as well as with a shut-off valve arranged in its circuit, a control valve and a relief valve, and with a pipe rupture protection device, including a pressure relief device with a check valve.
  • the device serves the purpose of applying a clamping force with hard pressure within a region of the soft reduction path that has not yet solidified or a clamping force with soft pressure within the region that has solidified of the soft reduction path, and to switch from hard pressure to soft pressure and vice versa.
  • the clamping force is applied evenly into the pressure rollers by the hydraulic cylinders both via the upper frame part and via the lower frame part.
  • Figure 1 shows a part of a support segment for the cast strand in a purely schematic representation, with an associated circuit diagram for performing the method according to the invention
  • FIG. 2 shows a support segment in the open position for the entry of a strand with a partially liquid core in the area of the sump tip.
  • FIG. 1 shows the part of a support segment 1 for the strand 2 cast in a continuous casting installation, for example a thin slab.
  • the support segment is located within the soft reduction section of the strand guide and has pressure or support rollers 3, 4 which, individually or, as in the present case, as a segment, are continuously subjected to a clamping force by means of the hydraulic cylinder 7.
  • Numeral 30 designates a mechanical stop of the intended thickness, against which the segment lower part 6 can be adjusted individually against the segment frame upper part 5 by pulling the piston rod of the cylinder 7 to the degree of soft reduction.
  • the thickness of the cast thin slab is reduced in small increments to reduce segregation inside the strand and to improve the surface quality.
  • the soft reduction section comprises at least large lengths of the strand with a molten core up to the tip of the liquid sump.
  • a special hydraulic circuit is provided in order to adapt the position of the support segments to the position of the sump tip that changes as a result of different operating conditions.
  • the working pressure of the hydraulic circuit above and below the piston in the hydraulic cylinder 7 is tapped and evaluated by the pressure sensor 10.
  • This pressure sensor 10 on the cylinder 7 ensures that a pressure increase in the cylinder is used, for example, to switch from hard printing to soft printing.
  • the pressure sensor 10 is connected to the pressure changeover valve 11 via signal lines.
  • the clamping cylinders 7 are primarily subjected to the soft reduction pressure, ie hard pressure, and are equipped with a check valve 12, for example a pipe rupture safety device or an unlockable check valve in connection with an overpressure valve.
  • Fuse 15 connected in such a way that every movement of the cylinder piston causes a pressure change which - as said - is used to switch to soft pressure in the event of an increase in pressure in the cylinder.
  • the shut-off valve 12 is opened by the relief valve 14, so that the segment can yield, i.e. that the segment mouth width can change, as a result of which the solidified strand piece 2 can pass through the segment 1 under soft pressure.
  • segment 1 If a non-solidified strand area with liquid sump arrives at another time in segment 1, segment 1, when applied with soft pressure, would yield under the ferrostatic pressure of strand 2 and open even more, which is not permitted and a reduction in quality of the Cast strand caused.
  • a pressure query is started in the hydraulic circuit, in which the control valve 13 is switched from soft pressure to hard pressure via the pressure sensor 10 at short intervals and the unlockable Check valve 12 is closed.
  • FIG. 2 shows a segment 1 for the entry of the strand 2 with strand shells 2 'not closed by a core 8 of liquid melt.
  • Segment frame includes the segment frame upper part 5 and the segment frame I
  • the segment 1 has the pressure guide rollers 2 and 4, which are partially provided with drives, for example, as is generally known.
  • the hydraulic cylinders 7 ' are subjected to soft pressure and the hydraulic cylinders 7 to hard pressure in the sense of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (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)
  • Treatment Of Fiber Materials (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

Stranggießanlage mit Soft-Reduction-StreckeContinuous caster with soft reduction section
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen in einer Stranggieß- anläge, 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 Klemmkraft beaufschlagt sind.The invention relates to a method and a device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation, comprising in a strand guide below the mold a soft reduction section with pressure rollers or support rollers, which are used individually or as a segment by means of hydraulics -Cylinders are infinitely variable against each other and can be limited by stops with a clamping force.
Die Mehrzahl der z.Zt. 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 Gießproduktes.The majority of the current Continuous casting plants in operation or in operation, in particular for casting thin slabs, implement an operating technique with soft reduction. The method and the corresponding device are mainly installed in the horizontal part of the strand guide of the continuous casting plants and serve to improve the structural quality and the surface quality of the cast product.
Der Soft-Reduction-Effekt wird durch Reduzierung der Strangdicke im Bereich seiner Erstarrung mit schmelzflüssigem Kern bis zur Spitze des flüssigen Sumpfes erzielt. Der Bereich, in welchem 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 area of its solidification with a molten core up to the tip of the liquid sump. The area in which the soft reduction has a significant influence on the internal strand quality lies in the solidification at FS: 0.3 to 0.8, corresponding to a length position on the solidification path. The soft reduction, the targeted reduction in thickness in the specified area, demonstrably reduces the tendency towards segregation in the melt.
Um in den wirksamen Bereich der Soft-Reduction bei unterschiedlichen Be- triebszuständen, 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. 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 Verfah- ren ist praktisch vollständig durchentwickelt und wird als dynamische Soft- Reduction bezeichnet, die jedoch seitens der technischen Verwirklichung mit hohem Aufwand verbunden ist.In order to reach the effective range of soft reduction under different operating conditions, for example caused by a change in the casting speed or standstills, the zone in which the strand thickness is reduced must be changeable in the longitudinal position of the strand. For this purpose, position-controlled clamping cylinders are used in the support segments. By determining the position of the sump tip, mathematically or by measuring the change in pressure of the strand on the pressure rollers, the support segments are set conically in the position which is favorable for soft reduction in order to carry out targeted thickness reduction on the continuous strand. This process is practically completely developed and is referred to as dynamic soft reduction, which, however, involves a great deal of effort in terms of technical implementation.
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 has for its object to provide, starting from the aforementioned prior art, a method and an apparatus for the continuous casting of slabs or blocks, in particular thin slabs of the type mentioned in the preamble of claim 1, which is a highly effective soft reduction with reduced technical effort Allows for high quality results. '
Zur Lösung der obengenannten Aufgabe wird erfindungsgemäß vorgeschlagen, daß innerhalb eines noch nicht durcherstarrten Bereiches der Soft-Reduction- Strecke mit einer Klemmkraft mit Hartdruck, und innerhalb des durcherstarrten Bereichs der Soft-Reduction-Strecke mit einer Klemmkraft mit Weichdruck ge- arbeitet wird, dass Grenz- bzw. Umschaltwerte für Hart- und Weichdruck definiert werden, und dass bei einer Klemmkraft unterhalb des Grenz- bzw. Umschaltwertes die Segmentklemmung mit Hartdruck, und oberhalb des Grenzbzw. Umschaltwertes die Segmentklemmung mit Weichdruck durchgeführt wird. Dem erfindungsgemäßen Verfahren liegt die aus dem praktischen Betrieb ge- wonnene 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 Falle 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 achieve the above object, it is proposed according to the invention that within a not yet solidified area of the soft reduction section with a clamping force with hard pressure, and within the solidified area of the soft reduction section with a clamping force with soft pressure that Limit or changeover values for hard and soft printing are defined, and that with a clamping force below the limit or changeover value the segment clamping with hard pressure and above the limit or Switching value the segment clamping is carried out with soft printing. The method according to the invention is based on the knowledge gained from practical operation that a solidified part of the strand, if it comes into the area of soft reduction, must not be deformed, because otherwise the support rollers or pressure rollers or their bearings or the Scaffold structure of the segments would be damaged, especially if several segments form the soft reduction area and are conical. Such a case can occur, for example, if the casting speed changes or as a result of an interruption in operation. In such a case then can be switched from the clamping pressure for soft reduction, the hard pressure, to soft printing with preferably 40% of the hard pressure at the outlet section of the strand.
Im Falle der Erfindung erfolgt diese Umstellung selbsttätig von Hartdruck auf Weichdruck - und gegebenenfalls umgekehrt - durch Ermittlung eines Druck- Anstiegimpulses, der in den Klemmzylindern entsteht durch das Eintreten des nicht verformbaren durcherstarrten Stranges in das konisch eingestellte Segment.In the case of the invention, this changeover takes place automatically from hard printing to soft printing - and possibly vice versa - by determining a pressure rise pulse which arises in the clamping cylinders as a result of the non-deformable solidified strand entering the conically adjusted 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.One embodiment of the method provides that when the hard reduction of the soft reduction section is in operation, when the upper limit or switchover value is reached, the switch is made to soft print, and vice versa when the soft pressure is in the operating state when the lower pressure, limit or Switchover value is switched to hard printing.
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 Klemmzylindern eine Umschaltung von Hartdruck auf Weich- druck erfolgt.The method according to the invention is further developed in such a way that when a non-deformable, solidified strand part enters a segment that is conically set for hard printing, a changeover from hard printing to soft printing takes place due to the pressure rise impulse that occurs in the clamping cylinders.
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. 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.The clamping cylinders are primarily subjected to soft reduction pressure, the so-called hard pressure, each movement of the cylinder piston causing a change in pressure. A pressure sensor on the cylinder ensures that the pressure increase in the cylinder is used to switch to soft printing. For practical implementation, a shut-off valve is partially opened by a relief valve, so that the segment in the hydraulic circuit can yield, that is to say that the segment mouth width can change and the solidified strand piece can pass the segment under soft pressure. Furthermore, an embodiment of the method according to the invention provides that after switching over a segment to an operating state with soft printing for a solidified strand part, in the case of the subsequent entry of a non-solidified strand part into the segment, a pressure query is started, with short, intermittent time intervals of Soft printing is switched to hard printing - and vice versa - and it is checked whether the pressures remain unchanged or whether they are above or below the respective limit or switchover value and that the setting for hard printing or soft printing is made depending on the pressure test. This measure prevents the segment from being opened too far by the ferrostatic pressure of the melt.
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 segments behind them are subjected to the intermittent pressure query until the end of the machine. 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 er- hält.An expedient embodiment of the method provides that, in particular in the horizontal part of the continuous casting installation, a continuous section is determined in which the soft reduction conditions apply for the operating conditions of the casting operation and for the types of steel used. In the particular strand support section, special care must be taken to ensure that all support segments can be individually adjusted with the required taper in such a way that the continuous strand receives the deformation required for soft reduction.
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 Zu- sammenfahren der Stützrollen und damit eine Beschädigung der gesamten Stützkonstruktion. Eine Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen in einer Stranggießanlage, umfassend in einer Strangführung eines Soft-Reduction-Strecke mit Druck- bzw. Stützrollen, die einzeln oder als Segment mittels Hydraulik-Zylindern gegeneinander stufenlos sowie durch Anschläge begrenzbar mit einer Klemmkraft beaufschlagbar sind, umfaßt ein Segment mit am Strang anpreßbaren und mit einstellbarer Geschwindigkeit antreibbaren Stützrollen bzw. Druckrollen in einem Segmentrahmen mit Rahmenoberteil und Rahmenunterteil, sowie mit Hydraulik-Zylindern. 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. Die Vorrichtung dient dem Zweck, eine Klernmkraft mit Hartdruck innerhalb eines noch nicht durcherstarrten Bereichs der Soft-Reduction-Strecke bzw. eine Klemmkraft mit Weichdruck innerhalb des durcherstarrten Bereichs der Soft-Reduction-Strecke aufzubringen sowie von Hartdruck auf Weichdruck umzuschalten und umgekehrt. Die Klemmkraft wird von den Hydraulik-Zylindern sowohl über das Rahmenoberteil als auch über das Rahmenunterteil gleichmäßig in die Druckrollen eingeleitet.For this purpose, the method can provide that the hydraulically adjustable support segments against mechanical stops with a predetermined thickness are individually adjusted to a predetermined degree of soft reduction. The mechanical stops prevent the support rollers from moving too close together and thus damage the entire support structure. A device for the continuous casting of slabs or blocks, in particular thin slabs in a continuous casting installation, comprising in a strand guide a soft-reduction section with pressure or support rollers which can be stepped individually or as a segment by means of hydraulic cylinders and can be limited by stops with one Clamping force can be applied, comprises a segment with support rollers or pressure rollers which can be pressed onto the strand and driven at an adjustable speed in a segment frame with upper frame part and lower frame part, as well as with hydraulic cylinders. According to the invention, a hydraulic circuit is provided with a pressure sensor and with the pressure changeover valve controllable by it, as well as with a shut-off valve arranged in its circuit, a control valve and a relief valve, and with a pipe rupture protection device, including a pressure relief device with a check valve. The device serves the purpose of applying a clamping force with hard pressure within a region of the soft reduction path that has not yet solidified or a clamping force with soft pressure within the region that has solidified of the soft reduction path, and to switch from hard pressure to soft pressure and vice versa. The clamping force is applied evenly into the pressure rollers by the hydraulic cylinders both via the upper frame part and via the lower frame part.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles. Es zeigen:Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings. Show it:
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;Figure 1 shows a part of a support segment for the cast strand in a purely schematic representation, with an associated circuit diagram for performing the method according to the invention;
Figur 2 ein Stützsegment in geöffneter Position zum Einlauf eines Stran- ges mit teilweise flüssigem Kern im Bereich der Sumpfspitze. In Figur 1 ist der Teil eines Stützsegmentes 1 für den in einer Stranggießanlage gegossenen 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.FIG. 2 shows a support segment in the open position for the entry of a strand with a partially liquid core in the area of the sump tip. FIG. 1 shows the part of a support segment 1 for the strand 2 cast in a continuous casting installation, for example a thin slab. The support segment is located within the soft reduction section of the strand guide and has pressure or support rollers 3, 4 which, individually or, as in the present case, as a segment, are continuously subjected to a clamping force by means of the hydraulic cylinder 7.
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.Numeral 30 designates a mechanical stop of the intended thickness, against which the segment lower part 6 can be adjusted individually against the segment frame upper part 5 by pulling the piston rod of the cylinder 7 to the degree of soft reduction.
II
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 Betriebsbedincjungen jeweils veränderte Lage der Sumpfspitze anzupassen, ist eine spezielle hydraulische Schaltung vorgesehen.In the soft reduction line, the thickness of the cast thin slab is reduced in small increments to reduce segregation inside the strand and to improve the surface quality. The soft reduction section comprises at least large lengths of the strand with a molten core up to the tip of the liquid sump. A special hydraulic circuit is provided in order to adapt the position of the support segments to the position of the sump tip that changes as a result of different operating conditions.
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.1, the working pressure of the hydraulic circuit above and below the piston in the hydraulic cylinder 7 is tapped and evaluated by the pressure sensor 10. This pressure sensor 10 on the cylinder 7 ensures that a pressure increase in the cylinder is used, for example, to switch from hard printing to soft printing. For this purpose, the pressure sensor 10 is connected to the pressure changeover valve 11 via signal lines.
Die Klemmzylinder 7 sind primär mit dem Soft-Reduction-Druck, d.h. mit Hart- druck, beaufschlagt, und sind mit einem Sperrventil 12, z.B. Rohrbruchsicherung oder entsperrbarem Rückschlagventil in Verbindung mit einer Überdruck- Sicherung 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 subjected to the soft reduction pressure, ie hard pressure, and are equipped with a check valve 12, for example a pipe rupture safety device or an unlockable check valve in connection with an overpressure valve. Fuse 15 connected in such a way that every movement of the cylinder piston causes a pressure change which - as said - is used to switch to soft pressure in the event of an increase in pressure in the cylinder.
Im Falle des Weichdrucks wird andererseits das Sperrventil 12 durch das Entla- stungsventil 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 shut-off valve 12 is opened by the relief valve 14, so that the segment can yield, i.e. that the segment mouth width can change, as a result of which the solidified strand piece 2 can pass through the segment 1 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.If a non-solidified strand area with liquid sump arrives at another time in segment 1, segment 1, when applied with soft pressure, would yield under the ferrostatic pressure of strand 2 and open even more, which is not permitted and a reduction in quality of the Cast strand caused.
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.In order to avoid further opening of the segment 1 due to the ferrostatic pressure of the non-solidified strand 2, a pressure query is started in the hydraulic circuit, in which the control valve 13 is switched from soft pressure to hard pressure via the pressure sensor 10 at short intervals and the unlockable 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, i.e. whether it remains below the changeover value or whether it increases. If the pressure remains below the changeover value, then strand 2 has 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 rises above the changeover value, strand 2 is completely solidified and the segment clamping must be switched to soft printing.
Figur 2 zeigt ein Segment 1 für den Einlauf des Stranges 2 mit durch einen Kern 8 von flüssiger Schmelze nicht geschlossenen Strangschalen 2'. DerFIG. 2 shows a segment 1 for the entry of the strand 2 with strand shells 2 'not closed by a core 8 of liquid melt. The
Segmentrahmen umfaßt das Segmentrahmen-Oberteil 5 und das Segmentrah- ISegment frame includes the segment frame upper part 5 and the segment frame I
88th
men-Unterteil 6, die durch Hydraulikzylinder 7, 7' gegen den ferrostatischen Druck der Strangschale 21 bzw. des flüssigen Schmelzenkerns 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 Weich- druck und die Hydraulik-Zylinder 7 mit Hartdruck im Sinne der Erfindung beaufschlagt. men-lower part 6, which are forced together by hydraulic cylinders 7, 7 'against the ferrostatic pressure of the strand shell 2 1 or the liquid melt core 8 with a relatively high force. For this purpose, the segment 1 has the pressure guide rollers 2 and 4, which are partially provided with drives, for example, as is generally known. The hydraulic cylinders 7 'are subjected to soft pressure and the hydraulic cylinders 7 to hard pressure in the sense of the invention.

Claims

Patentansprüche claims
1. Verfahren zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen, in einer Stranggießanlage, umfassend in einer Strangführung unterhalb der Kokille eine Soft-Reduction-Strecke mit1. Method for the continuous casting of slabs or blocks, in particular thin slabs, in a continuous casting installation, comprising a soft reduction section in a strand guide below the mold
Druckrollen bzw. Stützrollen (3, 4), die einzeln oder als Segment (1) mittels Hydraulik-Zylindern (7, 7') gegeneinander stufenlos sowie durch Anschläge (30) begrenzbar mit einer Klemmkraft beaufschlagt sind, dadurch gekennzeichnet, ' dass innerhalb eines noch nicht durcherstarrten Bereichs der Soft-Pressure rollers or support rollers (3, 4), which are applied individually or as a segment (1) by means of hydraulic cylinders (7, 7 ') to one another in a stepless manner and can be limited by stops (30) with a clamping force, characterized in that' within a not yet solidified area of the soft
Reduction-Strecke mit einer Klemmkraft mit Hartdruck, und innerhalb des durcherstarrten Bereichs der Soft-Reduction-Strecke mit einer Klemmkraft mit Weichdruck gearbeitet wird, dass Grenz- bzw. Umschaltwerte für Hart- und Weichdruck definiert wer- den, und dass bei einer Klemmkraft unterhalb des Grenz- bzw. Umschaltwertes die Segmentklemmung mit Hartdruck, und oberhalb des Grenzbzw. Umschaltwertes die Segmentklemmung mit Weichdruck durchgeführt wird.Reduction path with a clamping force with hard pressure, and within the solidified area of the soft reduction path with a clamping force with soft pressure, that limit or changeover values for hard and soft pressure are defined, and that with a clamping force below the limit or changeover value, the segment clamping with hard pressure, and above the limit or Switching value the segment clamping is carried out with soft printing.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass bei laufendem Gießbetrieb mit Hartdruck in der Soft-Reduction- Strecke, bei Erreichen eines oberen Grenz- bzw. Umschaltwertes für die Klemmkraft auf Weichdruck umgeschaltet, und umgekehrt bei laufendem Gießbetrieb in der Soft-Reduction-Strecke mit Weichdruck bei Erreichen eines unteren Grenz- bzw. Umschaltwertes für die Klemmkraft auf Hartdruck umgeschaltet wird. 2. The method according to claim 1, characterized in that when the casting operation is running with hard pressure in the soft reduction section, when an upper limit or changeover value for the clamping force is switched to soft printing, and vice versa when the casting operation is running in the soft reduction - Line with soft printing is switched to hard printing when a lower limit or switchover value for the clamping force is reached.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass bei Einlauf eines nicht verformbaren, durcherstarrten Strangteils in ein für Hartdruck konisch eingestelltes Segment aufgrund eines dabei ent- stehenden Druckanstieg-Impulses in den Klemmzylindern eine Umschaltung von Hartdruck auf Weichdruck erfolgt.3. The method according to claim 1 or 2, characterized in that when a non-deformable, solidified strand part enters a segment conically set for hard printing, a switching from hard printing to soft printing takes place due to a pressure rise pulse occurring in the clamping cylinders.
4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass nach Umschalten eines Segmentes auf einen Betriebszustand mit4. The method according to one or more of claims 1 to 3, characterized in that after switching a segment to an operating state with
Weichdruck für einen durcherstarrten Strangteil, im Falle des folgendenSoft printing for a solidified strand part, in the case of the following
Einlaufs eines nicht durcherstarrten Strangteils in das Segment eineEntry of a non-solidified strand part into segment one
. Druckabfrage gestartet wird, wobei in kurzen, taktweisen Zeitabständen von Weichdruck auf Hartdruck - und umgekehrt - umgeschaltet wird und geprüft wird, ob die Drücke unverändert bleiben, oder ob sie oberhalb bzw. unterhalb des jeweiligen Grenz- bzw. Umschaltwertes liegen und in Abhängigkeit der Druckprüfung die Einstellung auf Hartdruck bzw. Weichdruck erfolgt., Print query is started, switching from soft printing to hard printing - and vice versa - at short, intermittent intervals and checking whether the pressures remain unchanged or whether they are above or below the respective limit or switchover value and depending on the pressure test the setting is made for hard printing or soft printing.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass alle Stützsegmente im Soft-Reduction-Bereich und in den dahinter liegenden Segmenten bis zum Maschinenende der taktweisen Druckabfrage unterzogen werden.5. The method according to claim 4, characterized in that all support segments in the soft reduction area and in the underlying segments are subjected to the cyclical pressure query until the end of the machine.
6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass insbesondere im Horizontalteil der Stranggießanlage eine Strangstrecke bestimmt wird, in welcher für die Betriebszustände des Gießbe- triebes, sowie für die verwendeten Stahlsorten, die Soft-Reduction-6. The method according to one or more of claims 1 to 5, characterized in that, in particular in the horizontal part of the continuous casting installation, a continuous section is determined, in which the soft reduction, for the operating states of the casting operation, and for the types of steel used.
Bedingungen zutreffen. Conditions apply.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass in der bestimmten Strangstützstrecke alle Stützsegmente einzeln mit erforderlicher Konizität derart einstellbar sind, dass der durchlaufende Strang die für die Soft-Reduction erforderliche Verformung erhält.7. The method according to claim 6, characterized in that in the particular strand support section, all support segments can be individually adjusted with the required taper in such a way that the continuous strand receives the deformation required for the soft reduction.
8. Verfahren nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die hydraulisch einstellbaren Stützsegmente gegen mechanische Anschläge vorbestimmter Dicke (30) auf ein vorgegebenes Maß der Soft-8. The method according to one or more of claims 1 to 7, characterized in that the hydraulically adjustable support segments against mechanical stops of predetermined thickness (30) to a predetermined dimension of the soft
Reduction einzeln eingestellt werden.Reduction can be set individually.
9. , Verfahren nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichne , dass der Weichdruck auf etwa 30% bis 50% des Hartdrucks bspw. auf9., The method according to one or more of claims 1 to 8, characterized in that the soft printing to about 30% to 50% of the hard printing, for example
40% des Hartdrucks eingestellt wird.40% of the hard pressure is set.
10. Vorrichtung zum Stranggießen von Brammen oder Blöcken, insbesondere von Dünnbrammen, in einer Stranggießanlage, umfassend in einer Strangführung eine Soft-Reduction-Strecke mit Druck- bzw. Stützrollen (3,10. Device for the continuous casting of slabs or blocks, in particular thin slabs, in a continuous casting installation, comprising in a strand guide a soft reduction section with pressure or support rollers (3,
4), die einzeln oder als Segment (1) mittels Hydraulik-Zylindern (7, 71) gegeneinander stufenlos sowie durch Anschläge (30) begrenzbar mit einer Klemmkraft beaufschlagt sind, insbesondere zur Durchführung des Verfahrens nach der Erfindung, gekennzeichnet durch eine hydraulische Schaltung mit einem Drucksensor (10) und von diesem steuerbaren Druckumschaltventil (11) sowie mit in dessen Schaltkreis angeordneten Sperrventil (12), einem Steuerventil (13) und einem Entlastungsventil (14), sowie mit einer Rohrbruchsicherung, umfassend eine Überdrucksicherung (15) mit einem Rückschlagventil zwecks Aufbringung einer Klemmkraft mit Hartdruck innerhalb eines noch nicht durcherstarrten Bereichs der Soft-Reduction-Strecke bzw. einer Klemmkraft mit Weichdruck innerhalb des durcherstarrten Bereichs der Soft-Reduction-Strecke sowie zwecks Umschaltung von Hartdruck auf Weichdruck und umgekehrt. 4), which are applied individually or as a segment (1) by means of hydraulic cylinders (7, 7 1 ) to each other continuously and with stops (30) with a clamping force, in particular for carrying out the method according to the invention, characterized by a hydraulic circuit with a pressure sensor (10) and pressure switch valve (11) which can be controlled by this, as well as with a shut-off valve (12) arranged in its circuit, a control valve (13) and a relief valve (14), as well as with a pipe rupture safety device, comprising an overpressure safety device (15) with a Check valve for the application of a clamping force with hard pressure within a not yet solidified Area of the soft reduction section or a clamping force with soft printing within the solidified area of the soft reduction section and for the purpose of switching from hard printing to soft printing and vice versa.
EP01969503A 2000-08-26 2001-07-25 Continuous casting installation comprising a soft reduction section Expired - Lifetime EP1313579B1 (en)

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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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US6871693B2 (en) 2005-03-29
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US20040026066A1 (en) 2004-02-12
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JP2004507363A (en) 2004-03-11
CN1280042C (en) 2006-10-18

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