EP3272442A1 - Method for operating a strand guide in a continuous casting system and corresponding strand guide - Google Patents
Method for operating a strand guide in a continuous casting system and corresponding strand guide Download PDFInfo
- Publication number
- EP3272442A1 EP3272442A1 EP17182119.2A EP17182119A EP3272442A1 EP 3272442 A1 EP3272442 A1 EP 3272442A1 EP 17182119 A EP17182119 A EP 17182119A EP 3272442 A1 EP3272442 A1 EP 3272442A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand guide
- casting
- oscillation
- strand
- upper frame
- 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
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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
- 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
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
Definitions
- the invention relates to a method for operating a strand guide in a continuous casting plant for the casting of liquid metals.
- the invention relates to a corresponding strand guide.
- the invention is limited to strand guides in segmental design.
- a particular problem in the casting of liquid metals is the occurrence of bulges on the surface of the freshly poured casting strands, also called dynamic bulging. This problem occurs especially when casting at high casting speeds, i. H. at high mass flows.
- the problem is basically known in the art and there are various approaches to prevent or at least reduce the said undesirable bulges.
- the publication EP 0 946 318 B1 recommends to avoid vibrations of the casting mirror, a shift of roles of the upper frame relative to the subframe with an offset in a size between 10% and 50% of a roller pitch.
- the strand guide rollers of Subframe along the strand infinitely variable positionable.
- the bulge on the cast strand is advantageously smaller than in the case of guide rollers arranged opposite one another.
- the said displacement takes place only once before each casting operation, but not during a casting operation. A temporal change of the roller distances or the upper frame relative to the subframe during the casting operation does not take place.
- the distances of the roller segments are determined on the basis of a previously determined optimum for maximum damping of all bulging effects.
- a variable casting speed is also taken into account in determining the roll distances.
- the optimized distances can also be increased or decreased in an irregular sequence during the casting operation. Due to the succession of constantly changing support rollers, the Badadorschwankept be advantageously minimized or avoided altogether.
- the strand guide rollers known in the art have a diameter of 100 to 300 mm.
- the present invention seeks to provide an alternative method for operating a strand guide in a Strangg cordaniage for casting of liquid metals and a corresponding alternative strand guide to avoid unwanted vibrations in the bath level of the liquid metal in the mold or preferably at least reduce.
- This object is procedurally achieved by the method claimed in claim 1.
- This is characterized in that the displacement of at least a part of the roller segment in the form of a Oscillation takes place in and against the casting direction.
- the claimed oscillation advantageously reduces or preferably avoids fluctuations in the bath level in the mold. The oscillation causes a homogenization of the casting conditions, in particular breakthroughs and massive quality deviations in the cast casting strand are avoided.
- FIG. 1 shows the strand guide 120 according to the invention in a Strangg cordaniage 100.
- the Strangg cordaniage comprises a mold 110, in which the liquid metal, in particular a steel material is cast into a cast strand.
- the strand guide 120 adjoins the mold 110 in the casting direction G and serves to transfer the casting strand from the typically vertically oriented mold 110 into the horizontal.
- the strand guide 120 according to the invention has at least one roller segment 130, but typically a plurality of such roller segments 130, which are arranged one behind the other in the casting direction.
- FIG. 2 It shows the typical structure of a roller segment 130 according to the invention. It consists of an upper frame 132 on which a plurality of strand guide rollers 136 are rotatably mounted.
- the roller segment 130 has a lower frame 134 on which a plurality of strand guide rollers 136 are also rotatably mounted.
- Both the strand guide rollers of the upper frame as well as the strand guide rollers of the subframe are each fixedly spaced from each other to the frame. Their diameters d are between 95 and 400 mm, wherein within a segment, the strand guide rollers typically each have a same diameter.
- the upper frame 132 and / or the lower frame 134 is associated with an oscillation device 140 for oscillating the upper frame and / or the lower frame in the casting direction G.
- the said oscillation of the upper frame with the strand guide rollers rotatably mounted thereon preferably takes place with a fixed, ie non-oscillating, subframe.
- the subframe with the aid of the oscillator 140 in an oscillation in or against the casting direction are offset, preferably with a stationary upper frame 132.
- both the subframe and the upper frame oscillate, either synchronously or not synchronous.
- the amplitude of the oscillation of the upper frame 132 and / or the lower frame 134 is preferably between 0 and 50 mm. In this case, the size of the amplitude of the oscillation can be adjusted as a function of the casting speed.
- the casting speed Vg during which the oscillation takes place is preferably between 0.17 m / min. and 8 m / min., more preferably it is however, in particular V g > 6 m / min.
- the mass flow of the cast strand is preferably at m > 3.5 t / min / m.
- the oscillation may, for example, be sinusoidal or trapezoidal.
- the adjustment of the amplitude or the frequency of the oscillation takes place independently of the current position of the bulge on the cast strand.
- the oscillation takes place in a roller segment, which is arranged in a horizontal region of the strand guide.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Betreiben einer Strangführung 120 in einer Stranggießanlage 100 zum Gießen von flüssigen Metallen. Darüber hinaus betrifft die Erfindung eine entsprechende Strangführung 120. Die Strangführung besteht aus mindestens einem Rollensegment 130, durch welches der Gießstrang nach dem Gießen in einer Kokille 110 geführt wird. Um unerwünschte allzu große Schwankungen des Badspiegels des flüssigen Metalls in der Kokille 110 zu vermeiden, schlägt die erfindungsgemäße Erfindung vor, den Oberrahmen (132) und/oder den Unterrahmen (134) des Rollensegmentes in bzw. entgegen der Gießrichtung G oszillieren zu lassen. The invention relates to a method for operating a strand guide 120 in a continuous casting plant 100 for the casting of liquid metals. In addition, the invention relates to a corresponding strand guide 120. The strand guide consists of at least one roller segment 130, through which the cast strand is guided after casting in a mold 110. In order to avoid unwanted excessive fluctuations of the bath level of the liquid metal in the mold 110, the invention proposes to oscillate the upper frame (132) and / or the lower frame (134) of the roller segment in or against the casting direction G.
Description
Die Erfindung betrifft ein Verfahren zum Betreiben einer Strangführung in einer Stranggießaniage zum Gießen von flüssigen Metallen. Darüber hinaus betrifft die Erfindung eine entsprechende Strangführung. Die Erfindung ist auf Strangführungen in Segmentbauweise beschränkt.The invention relates to a method for operating a strand guide in a continuous casting plant for the casting of liquid metals. In addition, the invention relates to a corresponding strand guide. The invention is limited to strand guides in segmental design.
Ein besonderes Problem beim Gießen von flüssigen Metallen ist das Auftreten von Ausbauchungen auf der Oberfläche der frisch gegossenen Gießstränge, auch dynamisches Bulging genannt. Dieses Problem tritt insbesondere beim Gießen mit hohen Gießgeschwindigkeiten, d. h. bei hohen Massenflüssen auf. Das Problem ist im Stand der Technik grundsätzlich bekannt und es gibt verschiedene Ansätze, um die besagten unerwünschten Ausbauchungen zu verhindern bzw. zumindest zu reduzieren.A particular problem in the casting of liquid metals is the occurrence of bulges on the surface of the freshly poured casting strands, also called dynamic bulging. This problem occurs especially when casting at high casting speeds, i. H. at high mass flows. The problem is basically known in the art and there are various approaches to prevent or at least reduce the said undesirable bulges.
So empfiehlt die
Die Druckschrift
Schließlich lehrt die
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein alternatives Verfahren zum Betreiben einer Strangführung in einer Stranggießaniage zum Gießen von flüssigen Metallen sowie eine entsprechende alternative Strangführung bereitzustellen, um unerwünschte Schwingungen im Badspiegel des flüssigen Metalls in der Kokille zu vermeiden bzw. vorzugsweise zumindest zu reduzieren.Based on this prior art, the present invention seeks to provide an alternative method for operating a strand guide in a Stranggießaniage for casting of liquid metals and a corresponding alternative strand guide to avoid unwanted vibrations in the bath level of the liquid metal in the mold or preferably at least reduce.
Diese Aufgabe wird verfahrenstechnisch durch das in Patentanspruch 1 beanspruchte Verfahren gelöst. Dieses ist dadurch gekennzeichnet, dass das Verschieben von zumindest einem Teil des Rollensegmentes in Form einer Oszillation in und entgegen der Gießrichtung erfolgt. Durch die beanspruchte Oszillation werden vorteilhafterweise Schwankungen im Badspiegel in der Kokille reduziert bzw. vorzugsweise vermieden. Die Oszillation bewirkt eine Homogenisierung der Gießkonditionen, insbesondere Durchbrüche und massive Qualitätsabwertungen bei dem gegossenen Gießstrang werden vermieden.This object is procedurally achieved by the method claimed in claim 1. This is characterized in that the displacement of at least a part of the roller segment in the form of a Oscillation takes place in and against the casting direction. The claimed oscillation advantageously reduces or preferably avoids fluctuations in the bath level in the mold. The oscillation causes a homogenization of the casting conditions, in particular breakthroughs and massive quality deviations in the cast casting strand are avoided.
Vorrichtungstechnisch wird die oben genannte Aufgabe durch den Gegenstand des Anspruchs 15 gelöst. Die Vorteile dieser Lösung entsprechen den oben mit Bezug auf das beanspruchte Verfahren genannten Vorteilen. Konkrete Ausgestaltungen des beanspruchten Verfahrens und der beanspruchten Strangführung sind Gegenstand der abhängigen Ansprüche.In terms of apparatus, the above-mentioned object is achieved by the subject matter of claim 15. The advantages of this solution correspond to the advantages mentioned above with respect to the claimed method. Concrete embodiments of the claimed method and the claimed strand guide are the subject of the dependent claims.
Der Beschreibung sind zwei Figuren beigefügt, wobei
- Figur 1
- einen Längsschnitt durch eine Stranggießaniage mit einer Strangführung in Segmentbauweise; und
- Figur 2
- ein erfindungsgemäßes Rollensegment
- FIG. 1
- a longitudinal section through a Stranggießaniage with a strand guide in segmented construction; and
- FIG. 2
- an inventive roller segment
Die Erfindung wird nachfolgend unter Bezugnahme auf die genannten Figuren in Form von Ausführungsbeispielen detailliert beschrieben. In beiden Figuren sind gleiche technische Elemente mit gleichen Bezugszeichen bezeichnet.The invention will be described in detail below with reference to the said figures in the form of embodiments. In both figures, the same technical elements are designated by the same reference numerals.
Die Amplitude der Oszillation des Oberrahmens 132 und/oder des Unterrahmens 134 liegt vorzugsweise zwischen 0 und 50 mm. Dabei kann die Größe der Amplitude der Oszillation in Abhängigkeit der Gießgeschwindigkeit eingestellt werden.The amplitude of the oscillation of the
Die Gießgeschwindigkeit Vg während derer die Oszillation erfolgt, liegt vorzugsweise zwischen 0,17 m/min. und 8 m/min., weiter vorzugsweise liegt sie jedoch insbesondere Vg > 6 m/min. Der Massenfluss des Gießstrangs liegt vorzugsweise bei m > 3,5 t/min/m. Die Oszillation kann beispielsweise sinusförmig oder trapezförmig erfolgen. Die Einstellung der Amplitude oder der Frequenz der Oszillation erfolgen unabhängig von der aktuellen Position der Ausbauchung auf dem Gießstrang. Vorzugsweise erfolgt die Oszillation bei einem Rollensegment, welches in einem horizontalen Bereich der Strangführung angeordnet ist.The casting speed Vg during which the oscillation takes place is preferably between 0.17 m / min. and 8 m / min., more preferably it is however, in particular V g > 6 m / min. The mass flow of the cast strand is preferably at m > 3.5 t / min / m. The oscillation may, for example, be sinusoidal or trapezoidal. The adjustment of the amplitude or the frequency of the oscillation takes place independently of the current position of the bulge on the cast strand. Preferably, the oscillation takes place in a roller segment, which is arranged in a horizontal region of the strand guide.
- 100100
- Stranggießanlagecontinuous casting plant
- 110110
- Kokillemold
- 120120
- Strangführungstrand guide
- 130130
- Rollensegmentroller segment
- 132132
- Oberrahmentop frame
- 134134
- Unterrahmensubframe
- 136136
- StrangführungsrollenStrand guide rolls
- 140140
- Oszillationseinrichtungoscillation
- AA
- Amplitude der OszillationAmplitude of the oscillation
- dd
- Durchmesser der StrangführungsrollenDiameter of the strand guide rollers
- GG
- Gießrichtungcasting
- mm
- Massenflussmass flow
- Vg V g
- Gießgeschwindigkeitcasting speed
Claims (19)
dadurch gekennzeichnet,
dass es sich bei dem oszillierenden Teil des Rollensegmentes (130) um den Oberrahmen (132) mit den daran drehbar gelagerten Strangführungsrollen (136) handelt.Method according to claim 1,
characterized,
in that the oscillating part of the roller segment (130) is the upper frame (132) with the strand guide rollers (136) rotatably mounted thereon.
dadurch gekennzeichnet,
dass der Unterrahmen (134) bei der Oszillation des Oberrahmens(132) ortsfest ist.Method according to claim 2,
characterized,
in that the subframe (134) is stationary during the oscillation of the upper frame (132).
dadurch gekennzeichnet,
dass es sich bei dem oszillierenden Teil des Rollensegmentes (130) um den Unterrahmen (134) mit den daran drehbar gelagerten Strangführungsrollen (136) handelt.Method according to claim 1,
characterized,
in that the oscillating part of the roller segment (130) is the subframe (134) with the strand guide rollers (136) mounted rotatably thereon.
dadurch gekennzeichnet,
dass der Oberrahmen (132) bei der Oszillation des Unterrahmens (134) ortsfest ist.Method according to claim 4,
characterized,
in that the upper frame (132) is stationary during the oscillation of the lower frame (134).
dadurch gekennzeichnet,
dass beide, sowohl der Oberrahmen (132) wie auch der Unterrahmen (134) mit ihren jeweiligen Strangführungsrollen (136) synchron oder asynchron zueinander oszillieren.Method according to claim 1,
characterized,
that both the upper frame (132) and the lower frame (134) oscillate with their respective strand guide rollers (136) synchronously or asynchronously with each other.
dadurch gekennzeichnet,
dass die Strangführungsrollen (136) an dem Oberrahmen (132) und an dem Unterrahmen (134), insbesondere während der Oszillation des Ober- und/oder Unterrahmens (134), jeweils einen festen Abstand zueinander aufweisen.Method according to one of the preceding claims,
characterized,
in that the strand guide rollers (136) each have a fixed distance from one another on the upper frame (132) and on the lower frame (134), in particular during the oscillation of the upper and / or lower frame (134).
dadurch gekennzeichnet,
dass für die Größe A der Amplitude (A) der Oszillation gilt: 0< A ≤ 50mm.Method according to one of the preceding claims,
characterized,
that for the size of the amplitude A (A) of oscillation 0 <A ≤ 50 mm.
dadurch gekennzeichnet,
das die Größe der Amplitude (A) nach Maßgabe der Größe der Gießgeschwindigkeit eingestellt wird.Method according to claim 8,
characterized
the magnitude of the amplitude (A) is adjusted according to the size of the casting speed.
dadurch gekennzeichnet,
dass für die Gießgeschwindigkeit vg gilt: 0,17 m/min < vg < 8m/min,
vorzugsweise vg > 6m/min.Method according to one of the preceding claims,
characterized,
that applies to the casting speed vg: 0.17 m / min <vg <8m / min,
preferably vg> 6m / min.
dadurch gekennzeichnet,
dass für den Massenfluß m des Gießstrangs gilt: m > 3,5 to/min/m.Method according to one of the preceding claims,
characterized,
that applies to the mass flow m of the cast strand: m > 3.5 to / min / m.
dadurch gekennzeichnet,
dass die Oszillation z.B. sinusförmig oder trapezförmig erfolgt.Method according to one of the preceding claims,
characterized,
that the oscillation takes place, for example, sinusoidally or trapezoidally.
dadurch gekennzeichnet,
dass die Einstellung der Amplitude (A) und/oder der Frequenz der Oszillation unabhängig von einer aktuellen Position einer Ausbauchung auf dem Gießstrang erfolgt.Method according to one of the preceding claims,
characterized,
in that the adjustment of the amplitude (A) and / or the frequency of the oscillation takes place independently of a current position of a bulge on the cast strand.
dadurch gekennzeichnet,
dass die Oszillation horizontal erfolgt.Method according to one of the preceding claims,
characterized,
that the oscillation is horizontal.
dadurch gekennzeichnet,
dass es sich bei dem oszillierenden Teil des Rollensegmentes um den Oberrahmen (132) und/oder den Unterrahmen (134), jeweils mit den daran drehbar gelagerten Strangführungsrollen (136) handelt.Strand guide (120) according to claim 15,
characterized,
in that the oscillating part of the roller segment is the upper frame (132) and / or the lower frame (134), each with the strand guide rollers (136) rotatably mounted thereon.
dadurch gekennzeichnet,
dass die Strangführungsrollen (136) an dem Oberrahmen (132)und an dem Unterrahmen (134) jeweils einen festen Abstand zueinander aufweisen.Strand guide (120) according to claim 15 or 16,
characterized,
in that the strand guide rollers (136) each have a fixed distance from one another on the upper frame (132) and on the lower frame (134).
dadurch gekennzeichnet,
dass für den Durchmesser d der Strangführungsrollen (136) gilt: 95 mm < d < 400 mm.Strand guide (120) according to one of claims 15 to 17,
characterized,
that for the diameter d of the strand guide rollers (136) applies: 95 mm <d <400 mm.
dadurch gekennzeichnet,
dass sich das Rollensegment (130) in einem horizontalen Teil der Strangführung (120) befindet und die Oszillation horizontal erfolgt.A strand guide (120) according to any one of claims 15 to 18,
characterized,
that the roll segment (130) is in a horizontal part of the strand guide (120) and the oscillation takes place horizontally.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016213351.9A DE102016213351A1 (en) | 2016-07-21 | 2016-07-21 | Method for operating a strand guide in a continuous casting plant and corresponding strand guide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3272442A1 true EP3272442A1 (en) | 2018-01-24 |
EP3272442B1 EP3272442B1 (en) | 2019-01-02 |
Family
ID=59381183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17182119.2A Not-in-force EP3272442B1 (en) | 2016-07-21 | 2017-07-19 | Method for operating a strand guide in a continuous casting system and corresponding strand guide |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3272442B1 (en) |
DE (1) | DE102016213351A1 (en) |
ES (1) | ES2718798T3 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2036266A1 (en) * | 1970-07-22 | 1972-01-27 | Schloemann AG, 4000 Düsseldorf | Continuous casting appts - with uniform ingot cooling |
EP0946318B1 (en) | 1996-11-08 | 2001-05-23 | SMS Demag AG | Method and device for continuous thin slab steel casting |
EP0917922B1 (en) | 1997-11-21 | 2003-06-25 | SMS Demag AG | Process and plant for continuous casting slabs |
WO2007121838A1 (en) | 2006-04-22 | 2007-11-01 | Sms Demag Ag | Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facility |
-
2016
- 2016-07-21 DE DE102016213351.9A patent/DE102016213351A1/en not_active Withdrawn
-
2017
- 2017-07-19 EP EP17182119.2A patent/EP3272442B1/en not_active Not-in-force
- 2017-07-19 ES ES17182119T patent/ES2718798T3/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2036266A1 (en) * | 1970-07-22 | 1972-01-27 | Schloemann AG, 4000 Düsseldorf | Continuous casting appts - with uniform ingot cooling |
EP0946318B1 (en) | 1996-11-08 | 2001-05-23 | SMS Demag AG | Method and device for continuous thin slab steel casting |
EP0917922B1 (en) | 1997-11-21 | 2003-06-25 | SMS Demag AG | Process and plant for continuous casting slabs |
WO2007121838A1 (en) | 2006-04-22 | 2007-11-01 | Sms Demag Ag | Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facility |
Also Published As
Publication number | Publication date |
---|---|
DE102016213351A1 (en) | 2018-01-25 |
ES2718798T3 (en) | 2019-07-04 |
EP3272442B1 (en) | 2019-01-02 |
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