EP1050355A2 - Process and device for the production of continuously cast steel products - Google Patents
Process and device for the production of continuously cast steel products Download PDFInfo
- Publication number
- EP1050355A2 EP1050355A2 EP00108747A EP00108747A EP1050355A2 EP 1050355 A2 EP1050355 A2 EP 1050355A2 EP 00108747 A EP00108747 A EP 00108747A EP 00108747 A EP00108747 A EP 00108747A EP 1050355 A2 EP1050355 A2 EP 1050355A2
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- European Patent Office
- Prior art keywords
- rollers
- pair
- strand
- continuous casting
- deformation
- 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.)
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- 238000000034 method Methods 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910001208 Crucible steel Inorganic materials 0.000 title claims description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 15
- 238000007711 solidification Methods 0.000 claims description 13
- 230000008023 solidification Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000005204 segregation Methods 0.000 description 6
- 238000005056 compaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
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
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1282—Vertical casting and curving the cast stock to the horizontal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/14—Soft reduction
Definitions
- the invention relates to a method for producing continuously cast Steel products, the method comprising a step of deforming the liquid Has core of the cast product. It also relates to a device for Continuous casting of steel, comprising a mold, means for guiding in an arc and support of the drawn strand as well as means running along the continuous casting track arranged and movable relative to each other to a small deformation of the cast product. Such a small deformation is also known as softreduction.
- the continuously cast strand solidifies over the formation a fixed strand shell in the mold, then towards the middle of the strand solidify during the peeling process. This occurs on the solidification front to enrichment of alloying elements. These cause in solidified strand segregations, which in turn for inhomogeneities and uneven properties across the strand cross-section are responsible.
- the electromagnetic is Stirring known, wherein a flow movement is imposed on the melt.
- Stirring in the secondary cooling zone or in the final zone of a continuous caster is supposed to bring about a global solidification structure and core segregation Reduce.
- the present invention has for its object a method and a To provide device for the production of strand products with homogeneous Properties across the strand cross-section, in particular by preventing Segregations while increasing the core density.
- the procedure and the The device is intended, in particular, also in systems with high casting speeds and casting formats adapted to the final format are used.
- the basic idea of the invention is a control method in which the strand pull-out force as a controlled variable for setting the position of the swamp tip in relation to the position of a pair of rollers performing the deformation and thus the Roller nip is used along the continuous casting line to achieve that the bottom of the sump is always directly in the roller gap, i.e. that the Strand directly in the area between the two roles and thus during the Deformation solidified.
- the strand pull-out force is one of the specified ones Contact force of the rollers, the deformation thickness and a material characteristic dependent size.
- the setpoint is the pull-out force that results when the swamp tip is directly in the roller gap.
- the actual value from the setpoint can be the desired ratio between the top of the swamp and roller gap in a first embodiment by means of change the casting speed and in a second embodiment by means of change the position of the pair of rollers on the strand.
- the relationship between the top of the swamp and the roller gap both by the parameters of the casting speed as well as the movability of the pair of rollers along the continuous casting track is adjustable.
- the diameter of the rollers between 400 to 1800 mm.
- large roller diameters in relation is in proportion to the usual diameters of driver rollers flat angle of attack and optimal soft reduction over the pressed length attainable and a change in the pull-out force can be recognized.
- the depressed length with a flat angle of attack and at the same time large volume displacement sure that the volume reduction in the final solidification through Repulsion of the still liquid core is more than compensated.
- the choice of large roll diameters means a large reduction in thickness of the strand possible with only one pair of rollers, which in practice Operating range can account for a reduction of 12 to 15 mm without Strand causing internal damage.
- the stretch on the solidification front is low via a soft reduction setting. Determine the roll diameter the steepness of the soft reduction zone and thus the stretch limits and the degree of compaction.
- a pair of driver rollers is arranged downstream of the pair of rollers, above whose torque the value of the strand pull-out force can be determined.
- Figures 1 to 4 show different arrangements of the first and second Embodiment of the device according to the invention.
- a continuous casting device 1 shown in a very simplified manner, which is essentially a mold 2 and an arcuate continuous casting track 3.
- the continuous casting track 3 settles usually from a cooling area 4 and an adjoining one Pull-out and straightening area 5 together.
- a stationary pair of rollers 6, which consists of an upper and lower roller 7, 8 is composed.
- Downstream is behind that Pair of rollers 6 for reducing a pair of driver rollers 9 arranged for straightening an upper and lower driver roller 10 and 11.
- the respective roller stands 12, 13 are shown in a highly simplified manner.
- a first pair of rollers 6 and driver roller pair 9 is a second pair of rollers 14 with a corresponding pair of driver rollers 15 stationary in front of the first Continuous casting track arranged.
- the casting speed can regulated the formation of the swamp tip in the strand and thus achieved the goal be that the solidification of the strand is always in the gap between the pair of rollers takes place in order to achieve optimal core compaction and core segregation to prevent.
- the Bottom roller of the pair 20 is optionally available.
- the second embodiment of the invention is illustrated by means of FIGS. 3 and 4. It is a pair of rollers 16, which together with a corresponding driver roller pair 17 can be moved along the continuous casting track. Such a change in position is illustrated by the pair of rollers 16 'or 17'. Downstream of the strand, a straightening region 18 is arranged behind the pair of rollers 16 is composed of two pairs of driver rollers 19 and 20.
- FIG. 4 illustrates this embodiment with a movable pair of rollers 21, which is arranged behind the straightening area 18.
- 21 ' is the offset pair of rollers designated.
- the travel path is dependent on the Extraction force controlled. It also depends on the casting speed. With a low casting speed, a small travel path is sufficient (FIG. 3), at a higher casting speed, the travel distance becomes longer ( Figure 4).
- the control method in combination with a pair of driver rollers 22 is shown schematically in FIG. 5.
- a pair of rollers 23 is arranged on a continuous cast product with the initial thickness D 1 and the reduced thickness D 2 .
- the pair of rolls is either set to a target thickness or placed on spacers.
- Both the upper and lower rollers 24, 25 of the soft reduction rollers can be regulated with regard to their positioning force P and their path, shown schematically here with 26.
- the force Z required to pull out the strand is determined by means of the setting force P, the thickness difference and a material characteristic value, and the torque M d required for the rollers 27, 28 of the downstream driver 22 is calculated.
- the setpoint is the pull-out force that results when the sump tip S or the solidification end is located directly in the gap between the two rollers 24, 25. If there is a discrepancy between the actual value and the target value, the positional relationship between the pair of rollers and the bottom of the sump is corrected either by changing the casting speed or by changing the position of the pair of rollers 23.
- FIG. 6 illustrates the structure of such a soft reduction framework in a side view.
- the soft reduction and driver roller pair 23 and 22 are arranged in a common scaffold frame 29.
- the path and force control of the pair of rollers 23 is taken over by two hydraulic cylinders 32, 33 acting on the roller axles 30 and 31, which is clear from the sectional view AA of FIG.
- With 34 the continuous cast product is designated, with 35 the compressed core area between the two rollers 24 and 25.
- FIG. 8 shows the sectional view BB of FIG. 6.
- the two driver rollers 27, 28 are adjusted by means of the two hydraulic cylinders 36 and 37.
- the rollers 27 and 28 are each provided with drive means 38 and 39, the drive torque M d serves as a measure of the pull-out force Z.
- the scaffold frame 29 can be moved along the continuous casting path with a pair of soft reduction and driving roller 23 and 22. According to FIG. 9, this is preferably achieved by means of impellers 40, 41 which are arranged on both sides of the scaffolding frame 29. There are rails 42, 43 along the continuous casting track, in which the impellers can be moved in combination with the scaffold frame.
- FIGS. 10a and 10b by showing a roller with a diameter of 400 mm and a roller with a diameter of 1500 mm, it is made clear that a more controlled core compaction is possible with the aid of the relatively large rollers.
- a larger pressed length and a smaller angle ⁇ mean a flatter angle of attack and thus less elongation on the solidification front in the strand core area and a longer reduction distance. This has an advantageous effect on core compression.
- a satisfactory core compaction is possible with rollers with diameters between 400 and 1800 mm.
- both Blocks as well as billets are subjected to a soft reduction, in particular can compact profiled, rectangular, square or round strands in the core become.
- the device described can be used in new systems, at the same time it is possible to retrofit existing systems.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen von stranggegossenen Stahlerzeugnissen, wobei das Verfahren einen Verformungsschritt des flüssigen Kerns des Gießerzeugnisses aufweist. Zudem betrifft sie eine Vorrichtung zum Stranggießen von Stahl, umfassend eine Kokille, Mittel zur bogenförmigen Führung und Stützung des abgezogenen Strangs sowie Mittel, die entlang der Stranggießbahn angeordnet und zueinander beweglich sind, um eine geringe Verformung des Gießerzeugnisses durchzuführen. Ein solche geringe Verformung ist auch unter dem Begriff softreduction bekannt.The invention relates to a method for producing continuously cast Steel products, the method comprising a step of deforming the liquid Has core of the cast product. It also relates to a device for Continuous casting of steel, comprising a mold, means for guiding in an arc and support of the drawn strand as well as means running along the continuous casting track arranged and movable relative to each other to a small deformation of the cast product. Such a small deformation is also known as softreduction.
Beim Stranggießen erstarrt der kontinuierlich gegossene Strang über die Bildung einer festen Strangschale in der Kokille, um anschließend in Richtung Strangmitte während des Abziehvorgangs zu erstarren. Hierbei kommt es an der Erstarrungsfront zu Anreicherungen von Legierungselementen. Diese verursachen im durcherstarrten Strang Kernseigerungen, die wiederum für Inhomogenitäten und ungleichmäßige Eigenschaften über dem Strangquerschnitt verantwortlich sind.In continuous casting, the continuously cast strand solidifies over the formation a fixed strand shell in the mold, then towards the middle of the strand solidify during the peeling process. This occurs on the solidification front to enrichment of alloying elements. These cause in solidified strand segregations, which in turn for inhomogeneities and uneven properties across the strand cross-section are responsible.
Um die Erstarrungsvorgänge positiv zu beeinflussen, ist das elektromagnetische Rühren bekannt, wobei der Schmelze eine Strömungsbewegung auferlegt wird. Ein Rühren in der Sekundärkühlzone oder in der Finalzone einer Stranggießanlage soll ein globulitisches Erstarrungsgefüge herbeiführen und die Kernseigerung vermindern. To positively influence the solidification processes, the electromagnetic is Stirring known, wherein a flow movement is imposed on the melt. Stirring in the secondary cooling zone or in the final zone of a continuous caster is supposed to bring about a global solidification structure and core segregation Reduce.
Als ein weiteres Mittel zur Verhinderung der Seigerungen an der Erstarrungsfront und Erhöhung der Kerndichte wird die softreduction eingesetzt, bei der es zu einem geringfügigen Verwalzen des noch nicht vollständig durcherstarrten Stranges und damit des noch flüssigen Kerns kommt. Aus der EP 0 603 330 B1 ist ein Verfahren zum Herstellen von Knüppeln und Blöcken aus stranggegossenen Stahlerzeugnissen bekannt mit einem solchen Schritt des Verformens des flüssigen Kerns des Gießerzeugnisses. Dieser Verformungsschritt wird in der Stranggießbahn zwischen dem Punkt, an dem noch nicht erstarrte Bereiche vorhanden sind und dem Punkt, bei dem das Erzeugnis vollständig erstarrt ist, in einer Zone durchgeführt, die zwischen Punkten liegt, die einer Konzentration der festen Körner im Inneren des flüssigen Kerns von 10% bzw. 80% entsprechen. Hierzu wird eine Vorrichtung vorgeschlagen, die äußere und innere Segmente einer bogenförmigen Rollgangstrecke umfaßt. Die bogenseitig innenliegenden Segmente sind gegenüber den außenliegenden Segmenten beweglich. Senkrecht zu den Rollen der Segmente sind zusätzliche Rollen von Rollenkäfigen vorhanden, die ebenfalls in Richtung Gießachse gedrückt werden.As another means of preventing segregation on the solidification front and increasing the core density, soft reduction is used, which results in a slight rolling of the not yet completely solidified strand and with it comes the still liquid core. A method is known from EP 0 603 330 B1 for the production of billets and blocks from continuously cast steel products known with such a step of deforming the liquid Core of the cast product. This deformation step is in the continuous casting line between the point where there are areas that have not yet solidified and the point at which the product is completely solidified in a zone performed, which lies between points that a concentration of solid grains correspond to 10% or 80% inside the liquid core. To do this proposed a device, the outer and inner segments of an arcuate Includes roller table route. The segments on the inside of the bow are movable in relation to the outer segments. Perpendicular to the roles of the segments there are additional roles of roller cages, which also pressed in the direction of the pouring axis.
Ferner führt bei dem Schnellgießverfahren der sich einstellende längere und dünnere Sumpf zwangsläufig zu mehr Porosität und Seigerungen. Dies begrenzt wegen der schlechteren Qualitäten ein Ausnutzen der Vorteile des Schnellgießens.Furthermore, the quick casting process results in the longer and thinner ones Swamp inevitably leads to more porosity and segregation. This limits because the poorer qualities take advantage of the advantages of quick casting.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung bereitzustellen zur Herstellung von Strangprodukten mit homogenen Eigenschaften über den Strangquerschnitt insbesondere durch Verhinderung von Seigerungen bei gleichzeitiger Erhöhung der Kerndichte. Das Verfahren und die Vorrichtung sollen insbesondere auch bei Anlagen mit hohen Gießgeschwindigkeiten und an das Endformat angepaßten Gießformaten zum Einsatz kommen. The present invention has for its object a method and a To provide device for the production of strand products with homogeneous Properties across the strand cross-section, in particular by preventing Segregations while increasing the core density. The procedure and the The device is intended, in particular, also in systems with high casting speeds and casting formats adapted to the final format are used.
Diese Aufgabe wird mittels eines Verfahrens mit den Merkmalen des Anspruch 1 und einer Vorrichtung mit den Merkmalen des Anspruchs 4 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen offenbart.This object is achieved by means of a method with the features of claim 1 and a device with the features of claim 4 solved. Beneficial Refinements are disclosed in the subclaims.
Grundgedanke der Erfindung ist ein Regelverfahren, bei dem die Strangauszugskraft als Regelgröße zur Einstellung der Lage der Sumpfspitze im Verhältnis zu der Position eines die Verformung durchführenden Rollenpaares und somit des Rollenspaltes entlang der Stranggießbahn verwendet wird, um zu erreichen, daß sich die Sumpfspitze stets unmittelbar im Rollenspalt befindet, d.h., daß der Strang unmittelbar im Bereich zwischen den beiden Rollen und somit während des Verformungsschntts durcherstarrt. Die Strangauszugskraft ist eine von der vorgegebenen Anstellkraft der Rollen, der Verformungsdicke und einem Werkstoffkennwert abhängige Größe. Der Sollwert ist die Auszugskraft, die sich ergibt, wenn sich die Sumpfspitze unmittelbar im Rollenspalt befindet. Bei Abweichung des Istwertes vom Sollwert kann das gewünschte Verhältnis zwischen der Sumpfspitzenlage und Rollenspalt bei einer ersten Ausführungsform mittels Änderung der Gießgeschwindigkeit und bei einer zweiten Ausführungsform mittels Änderung der Position des Rollenpaars am Strang eingestellt werden. In einer dritten Ausführungsform wird vorgeschlagen, daß das Verhältnis zwischen der Sumpfspitzenlage und dem Rollenspalt sowohl durch die Parameter der Gießgeschwindigkeit als auch durch die Verfahrbarkeit des Rollenpaares entlang der Stranggießbahn regelbar ist. Insgesamt wird eine Änderung der Erstarrungslage beispielsweise durch Änderung der Gießtemperatur durch Überhitzung oder bei Änderung der Solidustemperatur nach erfolgter Legierungsfeineinstellung von dem Regelverfahren selbständig erkannt und korrigiert.The basic idea of the invention is a control method in which the strand pull-out force as a controlled variable for setting the position of the swamp tip in relation to the position of a pair of rollers performing the deformation and thus the Roller nip is used along the continuous casting line to achieve that the bottom of the sump is always directly in the roller gap, i.e. that the Strand directly in the area between the two roles and thus during the Deformation solidified. The strand pull-out force is one of the specified ones Contact force of the rollers, the deformation thickness and a material characteristic dependent size. The setpoint is the pull-out force that results when the swamp tip is directly in the roller gap. In case of deviation the actual value from the setpoint can be the desired ratio between the top of the swamp and roller gap in a first embodiment by means of change the casting speed and in a second embodiment by means of change the position of the pair of rollers on the strand. In a third embodiment it is suggested that the relationship between the top of the swamp and the roller gap both by the parameters of the casting speed as well as the movability of the pair of rollers along the continuous casting track is adjustable. Overall, a change in the solidification situation, for example by changing the casting temperature due to overheating or after a change the solidus temperature after fine adjustment of the alloy by the control method independently recognized and corrected.
Vorrichtungsgemäß wird vorgeschlagen, daß der Durchmesser der Rollen zwischen 400 bis 1800 mm liegt. Durch die Wahl großer Rollendurchmesser im Verhältnis zu den üblichen Durchmessern von Treiberrollen ist über den im Verhältnis flachen Anstellwinkel und über die gedrückte Länge eine optimale softreduction erreichbar und eine Änderung der Auszugskraft sicher erkennbar. Zudem stellt die gedrückte Länge mit flachem Anstellwinkel bei gleichzeitiger großer Volumenrückverdrängung sicher, daß die Volumenminderung in der Enderstarrung durch Rückverdrängung des noch flüssigen Kerns mehr als ausgeglichen wird. Dieser Vorteil wird bei den softreduction-Systemen mit mehreren Rollenpaaren nach dem Stand der Technik nicht sicher erreicht. Zudem ist es bei den bekannten Mehrrollensystemen nicht auszuschließen, daß es zwischen zwei benachbarten Rollenpaaren zur Enderstarrung kommt, was einer normalen Enderstarrung ohne softreduction gleichkommt.It is proposed according to the device that the diameter of the rollers between 400 to 1800 mm. By choosing large roller diameters in relation is in proportion to the usual diameters of driver rollers flat angle of attack and optimal soft reduction over the pressed length attainable and a change in the pull-out force can be recognized. In addition, the depressed length with a flat angle of attack and at the same time large volume displacement sure that the volume reduction in the final solidification through Repulsion of the still liquid core is more than compensated. This The advantage of the soft reduction systems with several pairs of rollers after State of the art not reliably achieved. It is also in the known multi-roller systems not to rule out that there is between two adjacent pairs of rollers comes to final solidification, which is a normal final solidification without softreduction equals.
Vorrichtungsgemäß ist durch die Wahl großer Rollendurchmesser eine große Dickenreduzierung des Strangs mit nur einem Rollenpaar möglich, die im praktischen Betriebsbereich eine Reduzierung von 12 bis 15 mm ausmachen kann, ohne am Strang Innenschäden zu verursachen. Die Dehnung an der Erstarrungsfront ist über eine weiche Reduzierungseinstellung gering. Die Rollendurchmesser bestimmen die Steilheit der softreduction-Zone und damit die Dehnungsgrenzen und den Grad der Verdichtung.According to the device, the choice of large roll diameters means a large reduction in thickness of the strand possible with only one pair of rollers, which in practice Operating range can account for a reduction of 12 to 15 mm without Strand causing internal damage. The stretch on the solidification front is low via a soft reduction setting. Determine the roll diameter the steepness of the soft reduction zone and thus the stretch limits and the degree of compaction.
Strangabwärts hinter dem Rollenpaar ist ein Treiberrollenpaar angeordnet, über deren Drehmoment der Wert der Strangauszugskraft bestimmbar ist.A pair of driver rollers is arranged downstream of the pair of rollers, above whose torque the value of the strand pull-out force can be determined.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung: Hierbei zeigen:
- Figur 1
- eine erste Ausführungsform der erfindungsgemäßen Vorrichtung mit einem stationär angeordneten Rollenpaar entlang der Stranggießbahn;
- Figur 2
- die Ausführungsform der Vorrichtung nach Figur 1 mit einem zweiten, wahlweise betätigbaren, stationär angeordneten Rollenpaar,
- Figur 3
- eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung mit einem entlang der Stranggießbahn verfahrbaren Rollenpaar, das strangabwärts vor einem Richtbereich angeordnet ist;
- Figur 4
- die Ausführungsform der Vorrichtung nach Figur 3 mit einem entlang der Stranggießbahn verfahrbaren Rollenpaar, das strangabwärts hinter einem Richtbereich angeordnet ist;
- Figur 5
- eine schematische Darstellung des erfindungsgemäßen Verfahrens in Kombination mit einem Treiberrollenpaar;
Figur 6- eine Seitenansicht der Vorrichtung mit Rollenpaar und Treiberrollenpaar;
- Figur 7
- eine Ansicht entlang des Schnittes A-A der Vorrichtung nach
Figur 6; Figur 8- eine Ansicht entlang des Schnittes B-B der Vorrichtung nach
Figur 6; Figur 9- eine Querschnittsansicht der Vorrichtung mit Fahrschienen;
- Figur 10a,b
- eine schematische Ansicht des Rollenpaares mit zwei unterschiedlich großen Rollendurchmessern.
- Figure 1
- a first embodiment of the device according to the invention with a stationary pair of rollers along the continuous casting track;
- Figure 2
- 1 the embodiment of the device according to FIG. 1 with a second, optionally operable, stationary pair of rollers,
- Figure 3
- a second embodiment of the device according to the invention with a pair of rollers which can be moved along the continuous casting track and which is arranged downstream of a straightening area;
- Figure 4
- 3 the embodiment of the device according to FIG. 3 with a pair of rollers which can be moved along the continuous casting path and which is arranged downstream of a straightening area;
- Figure 5
- a schematic representation of the inventive method in combination with a pair of driver rollers;
- Figure 6
- a side view of the device with pair of rollers and pair of driver rollers;
- Figure 7
- a view along section AA of the device of Figure 6;
- Figure 8
- a view along section BB of the device of Figure 6;
- Figure 9
- a cross-sectional view of the device with rails;
- Figure 10a, b
- a schematic view of the pair of rollers with two differently sized roller diameters.
Die Figuren 1 bis 4 zeigen verschiedene Anordnungen der ersten und zweiten
Ausführungform der erfindungsgemäßen Vorrichtung. In Figur 1 ist eine Stranggießvorrichtung
1 sehr vereinfacht dargestellt, die im wesentlichen eine Kokille 2
und eine bogenförmige Stranggießbahn 3 umfaßt. Die Stranggießbahn 3 setzt sich
üblicherweise aus einem Kühlbereich 4 und einem sich daran anschließenden
Auszieh- und Richtbereich 5 zusammen. Erfindungsgemäß wird der softreduction-Prozeß
nicht mittels einer Vielzahl von Rollenpaaren oder Rollenkäfigen, sondern
nur von einem stationär angeordneten Rollenpaar 6 übernommen, das sich aus
einer Ober- und Unterrolle 7, 8 zusammensetzt. Strangabwärts ist hinter dem
Rollenpaar 6 zum Reduzieren ein Treiberrollenpaar 9 zum Richten angeordnet mit
einer oberen und unteren Treiberrolle 10 und 11. Die jeweiligen Rollengerüste 12,
13 sind stark vereinfacht dargestellt.Figures 1 to 4 show different arrangements of the first and second
Embodiment of the device according to the invention. In Figure 1 is a continuous casting device
1 shown in a very simplified manner, which is essentially a mold 2
and an arcuate continuous casting track 3. The continuous casting track 3 settles
usually from a cooling area 4 and an adjoining one
Pull-out and straightening area 5 together. According to the soft reduction process
not by means of a large number of roller pairs or roller cages, but instead
only taken over by a stationary pair of
In Figur 2 sind entsprechende Bauteile mit gleichen Bezugszeichen versehen. Neben
einem ersten Rollenpaar 6 und Treiberrollenpaar 9 ist ein zweites Rollenpaar
14 mit entsprechendem Treiberrollenpaar 15 vor dem ersten stationär an der
Stranggießbahn angeordnet. Mittels Veränderung der Gießgeschwindigkeit kann
die Ausbildung der Sumpfspitze im Strang geregelt und damit das Ziel erreicht
werden, daß die Durcherstarrung des Strangs stets im Spalt zwischen dem Rollenpaar
stattfindet, um eine optimale Kernverdichtung zu erreichen und Kernseigerungen
zu verhindern. Bei zwei Rollenpaaren kann wahlweise das erste oder
zweite Rollenpaar eine softreduction der Sumpfspitze übernehmen, wobei die
Unterrolle des Paars 20 wahlweise vorhanden ist.Corresponding components are provided with the same reference symbols in FIG. Next
a first pair of
Die zweite Ausführungsform der Erfindung wird mittels der Figuren 3 und 4 verdeutlicht.
Es handelt sich um ein Rollenpaar 16, welches zusammen mit einem
entsprechenden Treiberrollenpaar 17 entlang der Stranggießbahn verfahrbar ist.
Eine solche Positionsänderung ist mit dem Rollenpaar 16' bzw. 17' verdeutlicht.
Strangabwärts ist hinter dem Rollenpaar 16 ein Richtbereich 18 angeordnet, der
sich aus zwei Treiberrollenpaaren 19 und 20 zusammensetzt.The second embodiment of the invention is illustrated by means of FIGS. 3 and 4.
It is a pair of
Figur 4 verdeutlicht diese Ausführungsform mit einem verfahrbaren Rollenpaar 21,
das hinter dem Richtbereich 18 angeordnet ist. Mit 21' ist das versetzte Rollenpaar
bezeichnet. Der Verfahrweg wird erfindungsgemäß in Abhängigkeit der
Strangauszugskraft gesteuert. Er ist ebenfalls abhängig von der Gießgeschwindigkeit.
Bei geringer Gießgeschwindigkeit reicht ein kleiner Verfahrweg (Figur 3),
bei höherer Gießgeschwindigkeit wird der Verfahrweg größer (Figur 4).FIG. 4 illustrates this embodiment with a movable pair of
Das Regelverfahren in Kombination mit einem Treiberrollenpaar 22 zeigt schematisch
Figur 5. Es ist ein Rollenpaar 23 auf einem Stranggießerzeugnis mit der
Ausgangsdicke D1 und der reduzierten Dicke D2 angeordnet. Das Rollenpaar wird
entweder auf eine Solldicke eingestellt oder auf Distanzstücke angestellt. Sowohl
die Ober- als auch die Unterrolle 24, 25 der softreduction-Rollen sind hinsichtlich
ihrer Anstellkraft P und ihrem Weg regelbar, hier mit 26 schematisch dargestellt.
Die erforderliche Kraft Z zum Ausziehen des Stranges wird mittels der Anstellkraft
P, der Dickendifferenz sowie einem Werkstoffkennwert bestimmt und das notwendige
Drehmoment Md für die Rollen 27, 28 des nachgeschalteten Treibers 22 berechnet.
Dabei ist der Sollwert die Auszugskraft, die sich ergibt, wenn sich die
Sumpfspitze S bzw. das Erstarrungsende unmittelbar im Spalt der beiden Rollen
24, 25 befindet. Bei einer Abweichung zwischen Ist- und Sollwert findet eine Korrektur
des Lageverhältnisses zwischen Rollenpaar und Sumpfspitze entweder
durch Änderung der Gießgeschwindigkeit oder durch Veränderung der Position
des Rollenpaares 23 statt.The control method in combination with a pair of
Figur 6 verdeutlicht den Aufbau eines solchen softreduction-Gerüstes in der Seitenansicht.
Das softreduction- und Treiberrollenpaar 23 und 22 sind in einem gemeinsamen
Gerüstrahmen 29 angeordnet. Die Weg- und Kraftregelung des Rollenpaares
23 wird von zwei auf die Rollenachsen 30 und 31 wirkenden Hydraulikzylindern
32, 33 übernommen, was durch die Schnittansicht A-A der Figur 7
deutlich wird. Mit 34 ist das Stranggußerzeugnis bezeichnet, mit 35 der zusammengepreßte
Kernbereich zwischen den beiden Rollen 24 und 25. Figur 8 zeigt
die Schnittansicht B-B der Figur 6. Die Anstellung der beiden Treiberrollen 27, 28
erfolgt mittels der beiden Hydraulikzylinder 36 und 37. Die Rollen 27 und 28 sind
jeweils mit Antriebsmitteln 38 und 39 versehen, deren Antriebsmoment Md als Maß
für die Auszugskraft Z dient. Nach der zweiten Ausführungsform ist
der Gerüstrahmen 29 mit softreduction- und Treiberrollenpaar 23 und 22 entlang
der Stranggießbahn verfahrbar. Dies wird nach Figur 9 vorzugsweise mittels Laufrädern
40, 41 erreicht, die an beiden Seiten des Gerüstrahmens 29 angeordnet
sind. Es sind Fahrschienen 42, 43 entlang der Stranggießbahn vorhanden, in denen
die Laufräder in Kombination mit dem Gerüstrahmen verfahrbar sind.Figure 6 illustrates the structure of such a soft reduction framework in a side view. The soft reduction and
Mittels der Figuren 10a und 10b wird durch Darstellung einer Rolle mit einem
Durchmesser von 400 mm und einer Rolle mit einem Durchmesser von 1500 mm
verdeutlicht, daß mit Hilfe der im Verhältnis großen Rollen eine kontrolliertere
Kernverdichtung möglich ist. Nach der Formel
Mit Hilfe des vorgeschlagenen Verfahrens und der Vorrichtung können sowohl Blöcke als auch Knüppel einer softreduction unterworfen werden, insbesondere können profilierte, rechteckige, quadratische oder runde Stränge im Kern verdichtet werden. Die beschriebene Vorrichtung kann in neue Anlagen eingesetzt werden, gleichzeitig ist es möglich, bestehende Anlagen nachzurüsten.With the help of the proposed method and the device, both Blocks as well as billets are subjected to a soft reduction, in particular can compact profiled, rectangular, square or round strands in the core become. The device described can be used in new systems, at the same time it is possible to retrofit existing systems.
Claims (9)
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
characterized,
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19921296 | 1999-05-07 | ||
DE19921296A DE19921296A1 (en) | 1999-05-07 | 1999-05-07 | Method and device for the production of continuously cast steel products |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1050355A2 true EP1050355A2 (en) | 2000-11-08 |
EP1050355A3 EP1050355A3 (en) | 2001-03-28 |
EP1050355B1 EP1050355B1 (en) | 2006-01-11 |
Family
ID=7907448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00108747A Expired - Lifetime EP1050355B1 (en) | 1999-05-07 | 2000-04-22 | Process for the production of continuously cast steel products |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1050355B1 (en) |
JP (1) | JP2000326060A (en) |
KR (1) | KR100707785B1 (en) |
CN (1) | CN1188234C (en) |
AT (1) | ATE315449T1 (en) |
BR (1) | BR0002396A (en) |
CA (1) | CA2307817A1 (en) |
DE (2) | DE19921296A1 (en) |
MX (1) | MXPA00004353A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106232263A (en) * | 2014-05-14 | 2016-12-14 | 新日铁住金株式会社 | The continuous casing of strand |
US10618107B2 (en) | 2016-04-14 | 2020-04-14 | GM Global Technology Operations LLC | Variable thickness continuous casting for tailor rolling |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100518327B1 (en) * | 2002-12-23 | 2005-10-04 | 주식회사 포스코 | A Method of Startup Procedure of Strip in the Twin Roll Strip Casting Process |
ES2651136T3 (en) * | 2012-05-24 | 2018-01-24 | Nippon Steel & Sumitomo Metal Corporation | Method for casting slab continuously |
CN109622630B (en) * | 2019-01-03 | 2020-04-24 | 包头铝业有限公司 | On-line adjusting method for rolling technological parameters of heat-resistant aluminum alloy rod |
CN110523937B (en) * | 2019-09-06 | 2021-07-23 | 首钢集团有限公司 | Pressing method and device |
CN112355262B (en) * | 2020-11-09 | 2021-10-15 | 湖南工程学院 | Control device for slab continuous casting dynamic soft reduction |
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DE4138740A1 (en) * | 1991-11-26 | 1993-05-27 | Schloemann Siemag Ag | METHOD AND DEVICE FOR CONTINUOUSLY casting slabs or blocks |
DE4436328A1 (en) * | 1993-10-14 | 1995-04-20 | Voest Alpine Ind Anlagen | Method and installation for continuous casting |
EP0603330B1 (en) * | 1991-09-12 | 1996-04-03 | ARVEDI, Giovanni | A process and apparatus for the manufacture of billets and blooms from a continuously last steel showing high or excellent quality |
EP0834364A2 (en) * | 1996-09-25 | 1998-04-08 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for high-speed continuous casting plants with reduction of the width during solidification |
EP0903192A1 (en) * | 1997-09-18 | 1999-03-24 | Kvaerner Metals Continuous Casting Limited | Improvements in and relating to casting |
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JPS56151147A (en) * | 1980-04-24 | 1981-11-24 | Nippon Steel Corp | Method for detecting leading end position of unsolidified part of continuously cast ingot |
JPS60257958A (en) * | 1984-06-05 | 1985-12-19 | Sumitomo Metal Ind Ltd | Detection of abnormality in continuous casting |
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JPH0745096B2 (en) * | 1988-04-19 | 1995-05-17 | 住友金属工業株式会社 | Continuous casting method |
JP3427546B2 (en) * | 1995-01-30 | 2003-07-22 | 大同特殊鋼株式会社 | Dissimilar steel continuous casting method |
JP3119203B2 (en) * | 1997-06-27 | 2000-12-18 | 住友金属工業株式会社 | Unsolidified rolling method of slab |
-
1999
- 1999-05-07 DE DE19921296A patent/DE19921296A1/en not_active Withdrawn
-
2000
- 2000-04-22 DE DE50012037T patent/DE50012037D1/en not_active Expired - Lifetime
- 2000-04-22 EP EP00108747A patent/EP1050355B1/en not_active Expired - Lifetime
- 2000-04-22 AT AT00108747T patent/ATE315449T1/en not_active IP Right Cessation
- 2000-04-30 CN CNB001082426A patent/CN1188234C/en not_active Expired - Fee Related
- 2000-05-01 JP JP2000132334A patent/JP2000326060A/en active Pending
- 2000-05-04 MX MXPA00004353A patent/MXPA00004353A/en unknown
- 2000-05-05 BR BR0002396-5A patent/BR0002396A/en not_active Application Discontinuation
- 2000-05-06 KR KR1020000024168A patent/KR100707785B1/en not_active IP Right Cessation
- 2000-05-08 CA CA002307817A patent/CA2307817A1/en not_active Abandoned
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EP0603330B1 (en) * | 1991-09-12 | 1996-04-03 | ARVEDI, Giovanni | A process and apparatus for the manufacture of billets and blooms from a continuously last steel showing high or excellent quality |
DE4138740A1 (en) * | 1991-11-26 | 1993-05-27 | Schloemann Siemag Ag | METHOD AND DEVICE FOR CONTINUOUSLY casting slabs or blocks |
DE4436328A1 (en) * | 1993-10-14 | 1995-04-20 | Voest Alpine Ind Anlagen | Method and installation for continuous casting |
EP0834364A2 (en) * | 1996-09-25 | 1998-04-08 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for high-speed continuous casting plants with reduction of the width during solidification |
EP0903192A1 (en) * | 1997-09-18 | 1999-03-24 | Kvaerner Metals Continuous Casting Limited | Improvements in and relating to casting |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106232263A (en) * | 2014-05-14 | 2016-12-14 | 新日铁住金株式会社 | The continuous casing of strand |
EP3144080A4 (en) * | 2014-05-14 | 2017-11-15 | Nippon Steel & Sumitomo Metal Corporation | Continuous casting method for slab |
US10076783B2 (en) | 2014-05-14 | 2018-09-18 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
CN106232263B (en) * | 2014-05-14 | 2019-01-18 | 新日铁住金株式会社 | The continuous casing of slab |
US10183325B2 (en) | 2014-05-14 | 2019-01-22 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
US10189077B2 (en) | 2014-05-14 | 2019-01-29 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
US10207316B2 (en) | 2014-05-14 | 2019-02-19 | Nippon Steel & Sumitomo Metal Corporation | Method for continuous-casting slab |
EP3549695A1 (en) * | 2014-05-14 | 2019-10-09 | Nippon Steel Corporation | Continuous casting method for slab |
US10618107B2 (en) | 2016-04-14 | 2020-04-14 | GM Global Technology Operations LLC | Variable thickness continuous casting for tailor rolling |
Also Published As
Publication number | Publication date |
---|---|
DE50012037D1 (en) | 2006-04-06 |
KR100707785B1 (en) | 2007-04-13 |
BR0002396A (en) | 2001-01-02 |
JP2000326060A (en) | 2000-11-28 |
CN1188234C (en) | 2005-02-09 |
EP1050355A3 (en) | 2001-03-28 |
CA2307817A1 (en) | 2000-11-07 |
CN1273148A (en) | 2000-11-15 |
EP1050355B1 (en) | 2006-01-11 |
MXPA00004353A (en) | 2002-03-12 |
KR20000077170A (en) | 2000-12-26 |
ATE315449T1 (en) | 2006-02-15 |
DE19921296A1 (en) | 2000-11-09 |
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