EP1441871B1 - Method and casting machine for production of casting bars in the shape of billets or blocks - Google Patents
Method and casting machine for production of casting bars in the shape of billets or blocks Download PDFInfo
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- EP1441871B1 EP1441871B1 EP02785358A EP02785358A EP1441871B1 EP 1441871 B1 EP1441871 B1 EP 1441871B1 EP 02785358 A EP02785358 A EP 02785358A EP 02785358 A EP02785358 A EP 02785358A EP 1441871 B1 EP1441871 B1 EP 1441871B1
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- soft reduction
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- 238000005266 casting Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000005204 segregation Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
Definitions
- the invention relates to a method for the production of cast strands in billet or block format, which are formed in a continuous casting mold into a cast strand and below the same in a strand guide with a casting radius a deflection from the vertical to the horizontal casting direction and then pass through a directional range, wherein the casting is guided between pairs of rolls, which is followed by a soft-reduction region with at least one pair of rolls.
- the invention also relates to a casting machine for carrying out the method.
- the strand is selectively reduced in thickness in the region of Resterstarrung with one or preferably more pairs of rolls. Therein, the reduction in thickness in the area of the soft reduction can take place uniformly or unevenly.
- strand cross-sections for soft reduction are formed with one-sided or multi-sided profile peaks or profile depressions, in order to achieve a significant improvement in the quality of the strand within a comparatively low power requirement.
- the soft reduction begins in the straightening area of the cast strand by adjusting the straightening rollers.
- speed and strand cooling must be set so that the residual solidification also takes place in the straightening area.
- the casting radius must be significantly increased for this purpose. This leads to significant additional costs of the corresponding system.
- a position of the rollers against spacers or the use of preferably position-controlled hydraulic cylinder is required to avoid smooth rolling a strand reduction in the wrong place.
- the document US 3,628,594 describes a device for reducing the cross-section of a cast strand comprising a pair of rollers drivable in a horizontal plane and pairs of drivable rollers arranged in vertical planes on opposite sides of the strand.
- the pairs of rollers through which the strand passes are counter to each other by means of hydraulic medium adjustable piston / cylinder units which serve to reduce vertical and horizontal cross-sectional dimensions of the casting.
- the unpublished German patent application with the file reference 101 44 234.3 describes a method and an apparatus for optimizing the quality of cast strands with round or approximately round cross-sections in the field of soft reduction.
- the casting strands are deformed under the mold in the region of Resterstarrung in at least one reducing plane by adjustable rollers to improve the internal quality reducing.
- the round or approximately round casting cross-section can be deformed by rollers set on both sides and offset by 90 ° to the reduction plane by an amount between 5% and 60% of the main reduction in the region of the solidification in order to increase the internal quality by means of a further core consolidation.
- rollers which can be set on both sides and offset by approximately 90 ° relative to the reduction plane.
- the document JP 12 37 062 provides that internal cracks in a cast strand during straight bending, even at higher casting speeds, are avoided by virtue of the strand having a retrograde trapezoidal format.
- the strand is formed in a mold with trapezoidal casting format of the inner wall surfaces whose width on the inside of the sheet is greater than the Width of the shape on the outside of the arch is to form the retrogressive trapezoidal format.
- the document JP 63 21 5353 shows a method for easier processing of a cast strand by carrying out the casting process using a water-coolable mold with a round or polygonal format.
- the continuous casting machine is followed by roller groups for stepwise rolling reduction, which perform the intended reduction alternately vertically and horizontally.
- stepwise rolling reduction which perform the intended reduction alternately vertically and horizontally.
- the continuously cast material with round or polygonal format is reduced by rolling before solidification in the central area and it segregation or voids are avoided.
- the continuous casting material is divided into intended lengths to obtain individual castings.
- the processing is facilitated, the formation of Lunkem and central segregations avoided and improves the quality of the structure significantly.
- the document JP 12 02 342 proposes the formation of notches in a part of the upper format side of the cast strand for reducing the tensile stress in the solidified region of a cast strand and improving its production from molten steel, and shaping the notched region during the continuous casting process .
- the cast strand After the cast strand has been pulled out vertically from the mold, it is first bent into a circular shape and then led to a horizontal stretching area.
- the strand is fed with upper and lower squeezing rollers in the horizontal stretching area to stretch it in the horizontal format. After complete solidification in the area of the sump tip of the strand is cut by means of cutting torch on the outer side of the horizontal stretch region.
- the document JP 21 42 654 allows the production of a round cast strand without internal cracking by stretching the cast strand by means of stretch rollers and pulling by means of rotating pinch rollers after solidification. By this method, a bending stress only becomes effective in the non-solidified portion of the strand, thereby reducing the formation of internal cracks.
- German Offenlegungsschrift 2 056 473 discloses a device for producing cast steel strands, comprising a mold, a curved strand guide and a strand conveying and deforming device having a pair of caliber rolls.
- the caliber roller pair contains a box caliber with a constriction in the caliber base.
- the rollers of the roller pairs are connected to an adjustable pressing device.
- a first pair of rollers may be followed by at least one further pair of rollers with chisel caliber, wherein the axes of the successive pairs of rollers are each rotated by 90 °.
- the invention has for its object to provide a method and a casting machine for billets / and block formats, with the or in the improvement of the internal quality of the cast strand can be achieved safely.
- the cast strands are formed in their directional range using profiled pairs of rollers with one or more profile profile elevations or profile recesses , And that they are subjected in the casting behind the directional area by means of at least one pair of rollers with smooth rollers of a soft reduction, for optimum adaptation of the pairs of rollers to the position of the sump tip these are moved approximately horizontally in the casting direction or against the casting direction and / or the pairs of rollers in the area of the soft reduction section B, depending on the position of the sump tip.
- the soft reduction can preferably be carried out with a pair of rollers.
- z. B. is determined by displacement or force measurement, after which the pairs of rollers are made accordingly.
- This measure is expedient in particular for steel grades with strong segregation tendencies and / or core porosities, wherein profile elevations or profile depressions of the strand cross-section are provided on all four sides.
- a profile height of max. 8% of the thickness of the reduced strand are complied with, with two-sided profiling a profile height on each side with max. 6%, and if profiled on all sides, a profile height on each side with max. 4% are respected. Also, a width of the profile with 30 - 80% of the corresponding side length should be maintained.
- a casting machine for the production of cast strands in billet or block format comprising a continuous casting mold for forming a cast strand, which is provided with a strand guide with a casting radius R for deflecting the cast strand from the vertical to the horizontal casting direction and then with a directional area A with pairs of rolls to which a soft-reduction region B adjoins with at least one pair of rollers, according to the invention is designed in such a way that profiled pairs of rolls with one-sided or multi-sided profile elevations h, b or profile recesses -h, b are assigned to the directional region A of the casting strands.
- Figure 1 shows a casting machine with the mold 1 when applying molten steel 10 and forming a cast strand 2 below the mold.
- the strand 2 passes through the casting radius R a deflection, from the vertical casting direction in the horizontal direction 13 with the tangent point 3.
- This tangent point 3 is located approximately in the middle of the directional area A, with the straightening rollers 4, 5, 6 to which the soft reduction area B adjoins.
- the soft reduction takes place in the soft reduction area B with the roller pairs 7, 8, 9 using smooth rollers.
- the soft reduction with the help of strand cooling and the casting speed can be set so that it ends with the bottom tip at the end of the soft reduction region B starting at the directional area A.
- Figures 2 a to 2 c show the formation of cast strip cross sections according to the invention with one or more sided profile peaks (h, b) with the resulting cross-sectional shapes C, D, E.
- FIGS. 3 a to 3 c show cast strand cross sections according to the invention, which are formed with profile recesses (-h, b) and have the cross-sectional shapes F, G, H.
- the respective profile recesses are designated by -h (or -h ') on the opposite side.
- the profiled rollers of the roller pairs 4, 5, 6 used for the production of the profile shapes correspond to profile elevations of the embodiment according to FIG. Fig. 4a with the format 11, while the format 12 are formed for the production of profile recesses.
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Abstract
Description
Die Erfindung betrifft ein Verfahren zur Produktion von Gusssträngen im Knüppel- oder Blockformat, die in einer Stranggießkokille zu einem gegossenen Strang ausgebildet werden und unterhalb derselben in einer Strangführung mit einem Gießradius eine Umlenkung aus der vertikalen in die horizontale Gießrichtung und anschließend einen Richtbereich durchlaufen, worin der Gussstrang zwischen Rollenpaaren geführt wird, an welche sich ein Soft-Reduktions-Bereich mit wenigstens einem Rollenpaar anschließt. Die Erfindung betrifft auch eine Gießmaschine zur Durchführung des Verfahrens.The invention relates to a method for the production of cast strands in billet or block format, which are formed in a continuous casting mold into a cast strand and below the same in a strand guide with a casting radius a deflection from the vertical to the horizontal casting direction and then pass through a directional range, wherein the casting is guided between pairs of rolls, which is followed by a soft-reduction region with at least one pair of rolls. The invention also relates to a casting machine for carrying out the method.
Bei Stranggießanlagen ist es bekannt, Seigerungen und Kernporosität durch Soft-Reduktion zu minimieren oder gänzlich zu verhindern. Dazu wird im Bereich der Resterstarrung der Strang mit einem oder vorzugsweise mehreren Rollenpaaren gezielt in der Dicke reduziert. Dabei kann die Dickenreduzierung im Bereich der Soft-Reduktion gleichmäßig oder ungleichmäßig erfolgen.In continuous casting plants, it is known to minimize segregation and core porosity by soft reduction or to prevent it altogether. For this purpose, the strand is selectively reduced in thickness in the region of Resterstarrung with one or preferably more pairs of rolls. Therein, the reduction in thickness in the area of the soft reduction can take place uniformly or unevenly.
Bei Blockanlagen werden Strangquerschnitte für die Soft-Reduktion mit ein- oder mehrseitigen Profilüberhöhungen bzw. Profilvertiefungen ausgebildet, um eine deutliche Verbesserung der Stranginnenqualität bei vergleichsweise geringem Kraftbedarf zu erreichen. Die Soft-Reduktion beginnt im Richtbereich des gegossenen Stranges durch Anstellen der Richtrollen. Dazu müssen Geschwindigkeit und Strangkühlung so eingestellt werden, dass auch die Resterstarrung im Richtbereich erfolgt.
Bei hohen Gießgeschwindigkeiten und/oder großen Gießquerschnitten muß hierfür der Gießradius wesentlich vergrößert werden. Dies führt zu erheblichen Mehrkosten der entsprechenden Anlage. Weiterhin ist eine Anstellung der Rollen gegen Distanzstücke oder die Verwendung vorzugsweise positionsgeregelter Hydraulikzylinder erforderlich, um mit glatten Rollen eine Strangreduzierung am falschen Ort zu vermeiden.In block systems, strand cross-sections for soft reduction are formed with one-sided or multi-sided profile peaks or profile depressions, in order to achieve a significant improvement in the quality of the strand within a comparatively low power requirement. The soft reduction begins in the straightening area of the cast strand by adjusting the straightening rollers. For this purpose, speed and strand cooling must be set so that the residual solidification also takes place in the straightening area.
At high casting speeds and / or large Gießquerschnitten the casting radius must be significantly increased for this purpose. This leads to significant additional costs of the corresponding system. Furthermore, a position of the rollers against spacers or the use of preferably position-controlled hydraulic cylinder is required to avoid smooth rolling a strand reduction in the wrong place.
Das Dokument US 3,628,594 beschreibt eine Vorrichtung zur Reduktion des Querschnitts eines Gussstranges, umfassend ein Paar in einer Horizontalebene antreibbare Rollen und Paare von in Vertikalebenen an entgegengesetzten Seiten des Stranges angeordneten antreibbaren Rollen.
Die Rollenpaare, welche der Strang durchläuft, sind gegeneinander mittels durch Hydraulikmedium anstellbare Kolben/Zylinder-Einheiten, die der Reduktion vertikaler und horizontaler Querschnitts-Dimensionen des Gussstranges dienen.The document US 3,628,594 describes a device for reducing the cross-section of a cast strand comprising a pair of rollers drivable in a horizontal plane and pairs of drivable rollers arranged in vertical planes on opposite sides of the strand.
The pairs of rollers through which the strand passes are counter to each other by means of hydraulic medium adjustable piston / cylinder units which serve to reduce vertical and horizontal cross-sectional dimensions of the casting.
Die nicht veröffentlichte deutsche Patentanmeldung mit dem Aktenzeichen 101 44 234.3 beschreibt ein Verfahren und eine Vorrichtung zur Optimierung der Qualität von Gusssträngen mit runden oder annähernd runden Querschnitten im Bereich der Soft-Reduktion.
Hierzu werden die Gießstränge unterhalb der Kokille im Bereich der Resterstarrung in wenigstens einer Reduzierebene durch anstellbare Rollen zur Verbesserung der Innenqualität reduzierend verformt. In einem weiteren Schritt kann der runde oder annähernd runde Gießquerschnitt durch beidseitig anstellbare und um 90° zur Reduzierebene versetzte Rollen um einen Betrag zwischen 5 % und 60 % der Hauptreduzierung im Bereich der Resterstarrung verformt werden, um die Innenqualität durch eine weitere Kemverdichtung zu erhöhen. Bei runden bzw. annähernd runden, insbesondere vergleichsweise großen Strangquerschnitten bzw. Strangquerschnittsbereichen, ist vorgesehen, dass zur Vermeidung von Gefügerissen bzw. unkontrollierten Verformungen des Stranges dieser durch beidseitig anstellbare, zur Reduzierebene um ca. 90 ° versetzte Rollen gestützt wird.The unpublished German patent application with the file reference 101 44 234.3 describes a method and an apparatus for optimizing the quality of cast strands with round or approximately round cross-sections in the field of soft reduction.
For this purpose, the casting strands are deformed under the mold in the region of Resterstarrung in at least one reducing plane by adjustable rollers to improve the internal quality reducing. In a further step, the round or approximately round casting cross-section can be deformed by rollers set on both sides and offset by 90 ° to the reduction plane by an amount between 5% and 60% of the main reduction in the region of the solidification in order to increase the internal quality by means of a further core consolidation. In the case of round or approximately round, in particular comparatively large, strand cross-sections or strand cross-sectional areas, it is provided that, in order to avoid structural cracks or uncontrolled deformations of the strand, it is supported by rollers which can be set on both sides and offset by approximately 90 ° relative to the reduction plane.
Das Dokument JP 12 37 062 sieht vor, dass innere Risse in einem Gussstrang beim Geradebiegen, selbst bei höheren Gießgeschwindigkeiten dadurch vermieden werden, dass der Strang ein rückläufig trapezoides Format besitzt. Hierfür wird der Strang in einer Kokille mit trapezoiden Gießformat der inneren Wandflächen geformt, deren Weite an der Innenseite des Bogens größer als die
Weite der Form an der Außenseite des Bogens ist, um das rückläufige trapezoide Format auszubilden.
Durch dieses Verfahren wird die Zug-Beanspruchung im ersten Bereich der oberen Formatseite des Gussstranges reduziert und die Gießgeschwindigkeit kann erhöht werden.
Das Dokument JP 63 21 5353 zeigt ein Verfahren zur leichteren Verarbeitung eines Gussstranges durch Ausführung des Gießprozesses unter Verwendung einer wasserkühlbaren Kokille mit rundem oder polygonalem Format.
Der Stranggießmaschine sind Walzen-Gruppen zur schrittweisen Walz-Reduktion nachgeordnet, welche die vorgesehene Reduktion abwechselnd vertikal und horizontal durchführen. Damit wird das kontinuierlich gegossene Material mit rundem oder polygonalem Format durch Walzen vor der Erstarrung im zentralen Bereich reduziert und es werden Seigerung oder Lunkerbildung vermieden.
Im Anschluß daran wird das Stranggussmaterial in vorgesehene Längen geteilt, um einzelne Gußstücke zu erhalten. Wenn Gußstücke in rechteckige Formate gebracht werden, wird die Verarbeitung erleichtert, die Entstehung von Lunkem und zentralen Seigerungen vermieden und die Gefügequalität wesentlich verbessert.The document JP 12 37 062 provides that internal cracks in a cast strand during straight bending, even at higher casting speeds, are avoided by virtue of the strand having a retrograde trapezoidal format. For this purpose, the strand is formed in a mold with trapezoidal casting format of the inner wall surfaces whose width on the inside of the sheet is greater than the
Width of the shape on the outside of the arch is to form the retrogressive trapezoidal format.
By this method, the tensile stress in the first area of the upper format side of the casting is reduced and the casting speed can be increased.
The document JP 63 21 5353 shows a method for easier processing of a cast strand by carrying out the casting process using a water-coolable mold with a round or polygonal format.
The continuous casting machine is followed by roller groups for stepwise rolling reduction, which perform the intended reduction alternately vertically and horizontally. Thus, the continuously cast material with round or polygonal format is reduced by rolling before solidification in the central area and it segregation or voids are avoided.
Subsequently, the continuous casting material is divided into intended lengths to obtain individual castings. When castings are placed in rectangular formats, the processing is facilitated, the formation of Lunkem and central segregations avoided and improves the quality of the structure significantly.
Das Dokument JP 12 02 342 schlägt für eine Reduktion der Zugbeanspruchung im erstarrten Bereich eines Gussstranges sowie zur Verbesserung von dessen Produktion aus geschmolzenem Stahl die Ausbildung von Einkerbungen in einem Teil der oberen Formatseite des Gussstranges vor, und ein Ausformen des eingekerbten Bereiches während des kontinuierlichen Gießprozesses. Nach vertikalem Ausziehen des Gussstranges aus der Kokille wird dieser zuerst in Kreisform gebogen und danach zu einem horizontalen Streckbereich geführt.
Der Strang wird mit oberen und unteren Quetschrollen in den horizontalen Streckbereich geführt, um ihn in das horizontale Format zu recken. Nach vollständiger Erstarrung im Bereich der Sumpfspitze wird der Strang mittels Schneidbrenner an der äußeren Seite des horizontalen Streckbereiches geschnitten. Durch dieses Verfahren wird die Zugbeanspruchung des Stranges im erstarrten Bereich der Grenzschicht an der Oberseite reduziert, und es wird ein kontinuierlicher Gießprozess selbst bei erhöhten Gießgeschwindigkeiten ermöglicht. Darüber hinaus werden Gefügerisse vermieden und die Produktivität wesentlich verbessert.
Das Dokument JP 21 42 654 ermöglicht die Produktion eines runden Gussstranges ohne innere Rissbildung durch Strecken des Gussstranges mittels Streckrollen und Ziehen mittels rotierenden Klemmrollen nach der Erstarrung. Durch dieses Verfahren wird eine Biegebeanspruchung nur wirksam im nicht erstarrten Bereich des Stranges, wodurch die Bildung innerer Risse reduziert wird.The document JP 12 02 342 proposes the formation of notches in a part of the upper format side of the cast strand for reducing the tensile stress in the solidified region of a cast strand and improving its production from molten steel, and shaping the notched region during the continuous casting process , After the cast strand has been pulled out vertically from the mold, it is first bent into a circular shape and then led to a horizontal stretching area.
The strand is fed with upper and lower squeezing rollers in the horizontal stretching area to stretch it in the horizontal format. After complete solidification in the area of the sump tip of the strand is cut by means of cutting torch on the outer side of the horizontal stretch region. By this method, the tensile stress of the strand in the solidified region of the boundary layer at the top is reduced, and a continuous casting process is made possible even at elevated casting speeds. In addition, microstructures are avoided and productivity significantly improved.
The document JP 21 42 654 allows the production of a round cast strand without internal cracking by stretching the cast strand by means of stretch rollers and pulling by means of rotating pinch rollers after solidification. By this method, a bending stress only becomes effective in the non-solidified portion of the strand, thereby reducing the formation of internal cracks.
Aus der deutschen Offenlegungsschrift 2 056 473 ist eine Vorrichtung zur Herstellung von gegossenen Strängen aus Stahl bekannt, bestehend aus einer Kokille, einer gekrümmten Strangführung und aus einer ein Kaliberwalzenpaar aufweisende Strangförder- und Verformungseinrichtung. Das Kaliberwalzenpaar enthält ein Kastenkaliber mit einer Einschnürung im Kalibergrund. Die Walzen der Walzenpaare sind mit einer einstellbaren Anpreßvorrichtung verbunden. Einem ersten Walzenpaar kann wenigstens ein weiters Walzenpaar mit Kastelkaliber folgen, wobei die Achsen der aufeinander folgenden Walzenpaare jeweils um 90° verdreht sind. Mit der Anordnung und der Form der Walzenpaare soll der gegossene Strang nicht nur verformt, sondern auch ausgezogen werden. Bereits im ersten Walzenpaar wird eine 36 % prozentige Querschnittsverminderung des Gussstranges bewirkt, so dass der im Strang vorhandene noch flüssige Kern vor die Walzenebene zurückgedrängt wird und ein Zusammenschweißen der erstarrten Strangteile erfolgt. Durch diese Maßnahmen sollen Innenrisse des Gussstranges vermieden werden.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Gießmaschine für Knüppel/und Blockformate anzugeben, mit dem bzw. bei der Verbesserungen der Innenqualität des Gussstranges sicher erreicht werden.Based on the aforementioned prior art, the invention has for its object to provide a method and a casting machine for billets / and block formats, with the or in the improvement of the internal quality of the cast strand can be achieved safely.
Zur Lösung der Aufgabe wird bei einem Verfahren zur Produktion von Gusssträngen in Knüppel- oder Blockformat, gemäß dem Oberbegriff von Anspruch 1 mit der Erfindung vorgeschlagen, dass die Gussstränge in ihrem Richtbereich unter Verwendung von profilierten Rollenpaaren mit ein- oder mehrseitigen Profilüberhöhungen oder Profilvertiefungen ausgebildet werden, und dass sie in Gießrichtung hinter dem Richtbereich mittels wenigstens eines Rollenpaares mit glatten Rollen einer Soft-Reduktion unterzogen werden, wobei zur optimalen Anpassung der Rollenpaare an die Position der Sumpfspitze diese in Gießrichtung oder entgegen der Gießrichtung annähernd horizontal verschoben werden und/oder die Rollenpaare im Bereich der Soft-Reduktions-Strecke B nach Maßgabe der Position der Sumpfspitze auf- oder zugefahren werden.To solve the problem is proposed in a method for the production of cast strands in billet or block format, according to the preamble of claim 1 with the invention that the cast strands are formed in their directional range using profiled pairs of rollers with one or more profile profile elevations or profile recesses , And that they are subjected in the casting behind the directional area by means of at least one pair of rollers with smooth rollers of a soft reduction, for optimum adaptation of the pairs of rollers to the position of the sump tip these are moved approximately horizontally in the casting direction or against the casting direction and / or the pairs of rollers in the area of the soft reduction section B, depending on the position of the sump tip.
Weitere Ausgestaltungen des Verfahrens nach der Erfindung sind entsprechend den Unteransprüchen vorgesehen.Further embodiments of the method according to the invention are provided according to the subclaims.
Dabei kann die Soft-Reduktion vorzugsweise mit einem Rollenpaar durchgeführt werden.The soft reduction can preferably be carried out with a pair of rollers.
Hierfür ist es weiterhin von Vorteil, dass die Position der Sumpfspitze mittels Rechenmodellen und/oder messtechnisch, z. B. durch Weg- oder Kraftmessung ermittelt wird, wonach die Rollenpaare entsprechend angestellt werden.For this purpose, it is also advantageous that the position of the sump tip by means of calculation models and / or metrologically, z. B. is determined by displacement or force measurement, after which the pairs of rollers are made accordingly.
Weiterhin kann mit Vorteil von der Maßnahme Gebrauch gemacht sein, dass bei zweiseitigen Profilüberhöhungen oder Profilvertiefungen diese vorzugsweise auf gegenüberliegenden Seiten des Stranges vorgesehen werden.Furthermore, use may advantageously be made of the measure that, in the case of two-sided profile elevations or profile depressions, these are preferably provided on opposite sides of the strand.
Diese Maßnahme ist insbesondere bei Stahlgüten mit starken Seigerungstendenzen und/oder Kernporositäten zweckmäßig, wobei Profilüberhöhungen bzw. Profilvertiefungen des Strangquerschnittes auf allen vier Seiten vorgesehen werden.This measure is expedient in particular for steel grades with strong segregation tendencies and / or core porosities, wherein profile elevations or profile depressions of the strand cross-section are provided on all four sides.
Dabei sollte bei einseitiger Profilierung eine Profilhöhe von max. 8 % der Dicke des reduzierten Stranges eingehalten werden, bei zweiseitiger Profilierung eine Profilhöhe auf jeder Seite mit max. 6 %, und bei allseitiger Profilierung eine Profilhöhe auf jeder Seite mit max. 4 % eingehalten werden.
Auch sollte eine Breite des Profils mit 30 - 80 % der entsprechenden Seitenlänge eingehalten werden.In the case of one-sided profiling, a profile height of max. 8% of the thickness of the reduced strand are complied with, with two-sided profiling a profile height on each side with max. 6%, and if profiled on all sides, a profile height on each side with max. 4% are respected.
Also, a width of the profile with 30 - 80% of the corresponding side length should be maintained.
Eine Gießmaschine zur Produktion von Gusssträngen im Knüppel- oder Blockformat, umfassend eine Stranggießkokille zur Ausbildung eines gegossenen Stranges, die mit einer Strangführung mit einem Gießradius R zur Umlenkung des Gussstranges aus der vertikalen in die horizontale Gießrichtung und anschließend mit einem Richtbereich A mit Rollenpaaren versehen ist, an welchen sich ein Soft-Reduktions-Bereich B mit wenigstens einem Rollenpaar anschließt, ist erfindungsgemäß in der Weise ausgebildet, dass dem Richtbereich A der Gussstränge profilierte Rollenpaare mit ein- oder mehrseitigen Profilüberhöhungen h, b oder Profilvertiefungen -h, b zugeordnet sind, und dass für den Bereich der Soft-Reduktion B mindestens ein Rollenpaar mit glatten Rollen nachgeordnet ist, wobei zur optimalen Anpassung der Rollenpaare an die Position der Sumpfspitze diese in Gießrichtung oder entgegen der Gießrichtung annähernd horizontal verschiebbar sind und/oder die Rollenpaare im Bereich der Soft-Reduktions-Strecke B nach Maßgabe der Position der Sumpfspitze auf- oder zufahrbar sind.A casting machine for the production of cast strands in billet or block format, comprising a continuous casting mold for forming a cast strand, which is provided with a strand guide with a casting radius R for deflecting the cast strand from the vertical to the horizontal casting direction and then with a directional area A with pairs of rolls to which a soft-reduction region B adjoins with at least one pair of rollers, according to the invention is designed in such a way that profiled pairs of rolls with one-sided or multi-sided profile elevations h, b or profile recesses -h, b are assigned to the directional region A of the casting strands. and that for the area of the soft reduction B at least one pair of rollers with smooth rollers is arranged downstream, wherein for optimal adaptation of the pairs of rollers to the position of the sump tip these are approximately horizontally displaceable in the casting direction or against the casting direction and / or the pairs of rollers in the soft Reduction section B can be opened or closed in accordance with the position of the sump tip.
Weitere Ausgestaltungen der Gießmaschine sind entsprechend den Unteransprüchen vorgesehen.Further embodiments of the casting machine are provided according to the subclaims.
Im Folgenden wird die Erfindung anhand von Zeichnungen dargestellt und erläutert:In the following the invention is illustrated and explained with reference to drawings:
Es zeigen:
- Figur 1
- Eine Gießmaschine mit Kokille und anschließender Strangführung
- Figuren 2a, 2b, 2c
- Strangquerschnitte C, D, E mit ein- oder mehrseitigen Profilüberhöhungen nach der Erfindung;
- Figuren 3a, 3b, 3c
- Strangquerschnitte F, G, H mit ein- oder mehrseitigen Profilvertiefungen nach der Erfindung;
- Figur 4a
- eine profilierte Rolle zur Herstellung von Profilerhöhungen;
- Figur 4b
- eine Profilrolle zur Ausbildung von Profilvertiefungen.
- FIG. 1
- A casting machine with mold and subsequent strand guide
- FIGS. 2a, 2b, 2c
- Strand cross-sections C, D, E with single or multi-sided profile elevations according to the invention;
- FIGS. 3a, 3b, 3c
- Strand cross-sections F, G, H with single or multi-sided profile depressions according to the invention;
- FIG. 4a
- a profiled roller for the production of profile elevations;
- FIG. 4b
- a profile role for the formation of profile recesses.
Figur 1 zeigt eine Gießmaschine mit der Kokille 1 beim Aufgeben von Stahlschmelze 10 und Ausbildung eines gegossenen Stranges 2 unterhalb der Kokille. Der Strang 2 durchläuft mit dem Gießradius R eine Umlenkung, aus der vertikalen Gießrichtung in die horizontale Richtung 13 mit den Tangenten-Punkt 3. Dieser Tangenten-Punkt 3 befindet sich annähernd in der Mitte des Richtbereiches A, mit den Richtrollen 4, 5, 6, an welchen sich der Soft-Reduktions-Bereich B anschließt. Die Soft-Reduktion erfolgt im Soft-Reduktions-Bereich B mit den Rollenpaaren 7, 8, 9 unter Verwendung glatter Rollen. Hierbei wird die Position der Sumpfspitze im Soft-Reduktions-Bereich B mit Hilfe von Rechenmodellen oder messtechnisch, z. B. durch Weg- oder Kraftmessung ermittelt, wonach dann die Rollenpaare 7-9 entsprechend angestellt werden.Figure 1 shows a casting machine with the mold 1 when applying molten steel 10 and forming a
Insgesamt kann die Soft-Reduktion mit Hilfe der Strangkühlung sowie der Gießgeschwindigkeit so eingerichtet werden, dass sie beginnend beim Richtbereich A mit der Sumpfspitze am Ende des Soft-Reduktions-Bereiches B endet.Overall, the soft reduction with the help of strand cooling and the casting speed can be set so that it ends with the bottom tip at the end of the soft reduction region B starting at the directional area A.
Die Figuren 2 a bis 2 c zeigen die Ausbildung von Gussstrangquerschnitten nach der Erfindung mit ein- oder mehrseitigen Profilüberhöhungen (h, b) mit den sich dabei ergebenden Querschnittsformen C, D, E.Figures 2 a to 2 c show the formation of cast strip cross sections according to the invention with one or more sided profile peaks (h, b) with the resulting cross-sectional shapes C, D, E.
Die Figuren 3 a bis 3 c zeigen Gussstrangquerschnitte nach der Erfindung, welche mit Profilvertiefungen (-h, b) ausgebildet sind, und die Querschnittsformen F, G, H, aufweisen. Die jeweiligen Profilvertiefungen sind mit -h (bzw. -h') auf der Gegenseite bezeichnet.FIGS. 3 a to 3 c show cast strand cross sections according to the invention, which are formed with profile recesses (-h, b) and have the cross-sectional shapes F, G, H. The respective profile recesses are designated by -h (or -h ') on the opposite side.
Die zur Herstellung der Profilformen verwendeten profilierten Rollen der Rollenpaare 4, 5, 6 entsprechen für Profilüberhöhungen der Ausbildung gem. Fig. 4a mit dem Format 11, während das Format 12 zur Herstellung von Profilvertiefungen ausgebildet sind.The profiled rollers of the roller pairs 4, 5, 6 used for the production of the profile shapes correspond to profile elevations of the embodiment according to FIG. Fig. 4a with the
Durch Verschieben des / der Rollenpaar(e) und / oder Auf- bzw. Zufahren der Rollen von Rollenpaaren ist eine optimale Lage (Bereich der Resterstarrung) für die Soft-Reduktion möglich, wodurch die angestrebte Verbesserung der Innenqualität sicher erreicht wird.By moving the roller pair (s) and / or raising or lowering the rollers of pairs of rollers, an optimal position (area of residual solidification) for the soft reduction is possible, whereby the desired improvement in the internal quality is reliably achieved.
Claims (13)
- A method for producing casting bars (2) in billet or block format which are formed into a casting bar (2) in a continuous casting mould (1) and run underneath the same in a strand guide having a casting radius R through a deflection from the vertical into the horizontal casting direction (13) and then through a straightening region A, wherein the casting bar (2) is guided between roll pairs (4, 5, 6) followed by a soft reduction region B having at least one roll pair (7, 8, 9),
characterised in that
the casting bars (2) are formed in the straightening region (A) using profiled roll pairs (4, 5, 6) with one-sided or multi-sided profile elevations (h, b) or profile recesses (-h, b), and that they are subjected to a soft reduction in the casting direction (13) after the straightening region (A) by means of at least one roll pair (7, 8, 9) with smooth rolls, wherein for optimal adaptation of the roll pair (7, 8, 9) to the position of the crater tip, these are displaced approximately horizontally in the casting direction (13) or opposite to the casting direction (13) and/or the roll pairs (7, 8, 9) in the region of the soft reduction section (B) are driven up or driven towards according to the position of the crater tip. - The method according to claim 1, characterised in that the soft reduction (B) is preferably carried out using a plurality of roll pairs (7, 8, 9).
- The method according to claim 1 or 2, characterised in that the position of the crater tip is determined by means of calculation models and/or by measurement technology, e.g. distance or force measurement, whereby the roll pairs (7, 8, 9) are correspondingly adjusted.
- The method according to one or more of claims 1 to 3, characterised in that in the case of two-sided profile elevations (h, b; h', b') or profile recesses (-h, b; -h', b) these are preferably provided on opposite sides of the casting bar (2).
- The method according to one or more of claims 1 to 4, characterised in that for steel qualities having strong tendencies to segregation and/or core porosities, profile elevations (h, b) or profile recesses (-h, b) of the strand cross section are provided on all four sides of the casting bar (2).
- The method according to one or more of claims 1 to 5, characterised in that in the case of one-sided profiling, a profile height (h) of a maximum of 8% of the thickness of the reduced casting bar (2) is maintained.
- The method according to one or more of claims 1 to 5, characterised in that in the case of two-sided profiling, a profile height (h) having a maximum of 6% is maintained on each side of the casting bar.
- The method according to one or more of claims 1 to 5, characterised in that in the case of profiling on all sides, a profile height (h) having a maximum of 4% is maintained on each side of the casting bar.
- The method according to one or more of claims 1 to 8, characterised in that a width (b) of the profile with 30 to 80% of the corresponding side length of the casting bar is maintained.
- A casting machine for producing casting bars (2) in billet or block format comprising a continuous casting mould (1) for forming a casting bar (2), which is provided with a strand guide having a casting radius (R) for deflecting the casting bar from the vertical into the horizontal casting direction (13) and is then provided with a straightening region (A) with roll pairs (4, 5, 6) followed by a soft reduction region (B) having at least one roll pair (7, 8, 9),
characterised in that
profiled roll pairs (4, 5, 6) with one-sided or multi-sided profile elevations (h, b) or profile recesses (-h, b) are assigned to the straightening region (A) of the casting bars (2) and at least one roll pair (7, 8, 9) with smooth rolls is located downstream for the soft reduction (B) region, wherein for optimal adaptation of the roll pair (7, 8, 9) to the position of the crater tip, these are displaced approximately horizontally in the casting direction (13) or opposite to the casting direction (13) and/or the roll pairs (7, 8, 9) in the region of the soft reduction section (B) are driven up or driven towards according to the position of the crater tip. - The casting machine according to claim 10,
characterised in that for the straightening region (A) at least one roll pair (4, 5, 6) with profiled rolls is provided on both sides of the tangent point (3). - The casting machine according to claim 10 or 11, characterised in that the roll pair(s) are arranged horizontally and/or vertically in the region of the soft reduction (B).
- The casting machine according to one or more of claims 10 to 12, characterised in that the rolls of the roll pairs provided with a profiling (4, 5, 6) are formed with negative diameter regions (-h, b) or with positive diameter regions (+h, b).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10153960 | 2001-11-06 | ||
DE10153960A DE10153960A1 (en) | 2001-11-06 | 2001-11-06 | Method and casting machine for the continuous casting of billet and block formats or the like |
PCT/EP2002/012263 WO2003039789A2 (en) | 2001-11-06 | 2002-11-04 | Method and casting machine for production of casting bars in the shape of billets or blocks |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1441871A2 EP1441871A2 (en) | 2004-08-04 |
EP1441871B1 true EP1441871B1 (en) | 2007-04-18 |
Family
ID=7704458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02785358A Expired - Lifetime EP1441871B1 (en) | 2001-11-06 | 2002-11-04 | Method and casting machine for production of casting bars in the shape of billets or blocks |
Country Status (6)
Country | Link |
---|---|
US (3) | US20050067135A1 (en) |
EP (1) | EP1441871B1 (en) |
AT (1) | ATE359887T1 (en) |
AU (1) | AU2002350668A1 (en) |
DE (2) | DE10153960A1 (en) |
WO (1) | WO2003039789A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010007660B4 (en) | 2010-01-12 | 2023-06-01 | Sms Group Gmbh | continuous casting machine |
CN113118397B (en) * | 2021-03-15 | 2023-01-31 | 上海二十冶建设有限公司 | Integral base of vertical continuous casting machine light pressure module and adjusting method thereof |
CN114054700B (en) * | 2021-10-15 | 2022-11-15 | 东北大学 | Method and device for pressing round billet |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2537356A (en) * | 1942-11-28 | 1951-01-09 | See Fabriks Aktiebolag | Rolling mill for the production of conical tubes |
AT251213B (en) * | 1964-07-03 | 1966-12-27 | Boehler & Co Ag Geb | Process for the production of square or round strands |
DE1602127A1 (en) * | 1967-08-12 | 1970-04-09 | Olsson Ag Erik | Method for eliminating or reducing internal defects in semi-finished products, in particular in cast blocks, slabs, billets and the like. |
US3650314A (en) * | 1969-11-19 | 1972-03-21 | Bohler & Co Ag Fa Geb | Apparatus for manufacturing stretch-formed products of high-melting metals |
US3837391A (en) * | 1971-02-01 | 1974-09-24 | I Rossi | Continuous casting apparatus |
US4519439A (en) * | 1977-07-26 | 1985-05-28 | Jernjontoret | Method of preventing formation of segregations during continuous casting |
DE4138740A1 (en) * | 1991-11-26 | 1993-05-27 | Schloemann Siemag Ag | METHOD AND DEVICE FOR CONTINUOUSLY casting slabs or blocks |
-
2001
- 2001-11-06 DE DE10153960A patent/DE10153960A1/en not_active Withdrawn
-
2002
- 2002-11-04 DE DE50209992T patent/DE50209992D1/en not_active Expired - Lifetime
- 2002-11-04 EP EP02785358A patent/EP1441871B1/en not_active Expired - Lifetime
- 2002-11-04 AU AU2002350668A patent/AU2002350668A1/en not_active Abandoned
- 2002-11-04 AT AT02785358T patent/ATE359887T1/en not_active IP Right Cessation
- 2002-11-04 WO PCT/EP2002/012263 patent/WO2003039789A2/en active IP Right Grant
- 2002-11-04 US US10/494,590 patent/US20050067135A1/en not_active Abandoned
-
2007
- 2007-05-24 US US11/807,141 patent/US20080041554A1/en not_active Abandoned
-
2009
- 2009-03-19 US US12/383,234 patent/US20090178777A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
AU2002350668A1 (en) | 2003-05-19 |
US20050067135A1 (en) | 2005-03-31 |
DE50209992D1 (en) | 2007-05-31 |
EP1441871A2 (en) | 2004-08-04 |
US20080041554A1 (en) | 2008-02-21 |
US20090178777A1 (en) | 2009-07-16 |
WO2003039789A2 (en) | 2003-05-15 |
WO2003039789A3 (en) | 2003-12-24 |
DE10153960A1 (en) | 2003-05-22 |
ATE359887T1 (en) | 2007-05-15 |
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