EP0902736B1 - Process and device for pouring of steel from an immersion outlet - Google Patents
Process and device for pouring of steel from an immersion outlet Download PDFInfo
- Publication number
- EP0902736B1 EP0902736B1 EP97926968A EP97926968A EP0902736B1 EP 0902736 B1 EP0902736 B1 EP 0902736B1 EP 97926968 A EP97926968 A EP 97926968A EP 97926968 A EP97926968 A EP 97926968A EP 0902736 B1 EP0902736 B1 EP 0902736B1
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- EP
- European Patent Office
- Prior art keywords
- immersion
- immersion delivery
- melt
- delivery portion
- means according
- 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.)
- Expired - Lifetime
Links
- 238000007654 immersion Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 7
- 239000010959 steel Substances 0.000 title claims abstract description 7
- 230000008569 process Effects 0.000 title abstract description 4
- 239000000155 melt Substances 0.000 claims abstract description 22
- 239000013598 vector Substances 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 2
- 238000007373 indentation Methods 0.000 claims 5
- 239000007791 liquid phase Substances 0.000 claims 3
- 238000005266 casting Methods 0.000 claims 1
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 208000029152 Small face Diseases 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000009189 diving Effects 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000792859 Enema Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007920 enema Substances 0.000 description 1
- 229940095399 enema Drugs 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Definitions
- the invention relates to a method and a device for influencing the Flow propagation of a metallic liquid, especially steel, from a melt container via a first immersion pouring part, which has a polygonal, has oval or circular cross section, and an intermediate part through a second immersion pouring part, which has an elongated cross section, guided into a stationary mold flows to produce slabs.
- a pouring tube for metallurgical vessels is known, which into an upper tubular length section and a lower rectangular one Length section part divided, with a between two length sections conical transition is provided.
- the rectangular cross section can be a Have aspect ratio of 20: 1 to 80: 1.
- a crossbar is provided which holds the liquid Steel leads into the side openings.
- the steel comes with relative high kinetic energy in the mold.
- the crossbar is high Exposed to wear.
- a submerged nozzle which has a shaped stone with a tubular Form, which has a conical component with a lower in the Melt immersed rectangular shaped stone is connected. At the bottom Shaped stones are provided in the flow cross-section of longitudinal webs.
- the invention has set itself the goal, the above.
- a method and an apparatus relating to a diving spout to create metal melts with which the turbulence in the Dipping spout itself and in the mold and at the same time the depth of penetration of the fed melt is minimized in the sump located in the mold.
- the invention achieves this goal by the characterizing features of Process claim 1 and device claim 5.
- the central volume flow in the inlet area of this immersion pouring part reduced.
- This reduction in volume flow is achieved by throttling the central area, while the spreading angle of the Liquid jet is enlarged and so far that a backflow in the Side region of the immersion pouring part having an elongated cross section in the essentially omitted.
- the throttling of the central volume flow is achieved in that the area before entering the immersion pouring part, which has an elongated cross section or the admission itself is designed in a special way.
- the Free space should be kept sufficiently open so that there is always a defined amount in the central area of the second immersion pouring part flows.
- the wall of the broad side of the in Pouring direction in front of the one with an elongated cross section Immersion part arranged intermediate part have a concave bulge.
- this bulge is in the form of a Quarter hollow sphere designed.
- it has the shape a pipe segment with a definable contour.
- the throttling is also achieved by narrowing the space of entry of the immersion pouring part. This constriction can be caused by flow bodies at the Wide side of the immersion pouring part are arranged or by molding dents be effected.
- the narrowing has a dimension whose width is approximately the same Diameter of the upstream tubular immersion pouring part and in length from 0.2 to 1.2 times its width.
- leading and trailing edges are sharp-edged and have thereby an angle ⁇ from the leading edge and the inner wall of 90 to 150 ° on.
- the shape of the intermediate part and the narrowing can be combined become. With this combination, it is proposed that the contour of the bulge of the Between the leading edge of the flow element in the second Align immersion pouring part.
- Figures 1 and 4 show longitudinal sections and Figures 2, 3 and 5 Cross sections of an immersion nozzle, which is composed of a first immersion nozzle 11, an intermediate part 31 and a second immersion pouring part 21 is composed.
- the Center axis is labeled I.
- the first is Immersion pouring part 11 fastened to a melt vessel 41 via a flange 12.
- the outlet 42 of the melt vessel 41 can be closed by a plug 43.
- the first immersion pouring part 11 has a round, oval or polygonal Cross-section and is via the intermediate part 31 with the second immersion pouring part 21 connected which has broad sides 25 which are significantly larger than Narrow sides 26.
- the first immersion pouring part 11 a slot 13.
- the second immersion pouring part 21 projects into a mold 51, the mouth 28 immersed in the melt S located in the mold 51. On the melt S is pourable powder P.
- the intermediate part 31 has a bulge 34, which in the right part as Spherical shape 35 and in the left part is designed as a tubular segment 36.
- the Pipe segment 36 can, based on its main axis II, a constant radius have or also be designed parabolic.
- FIG. 2 shows the top view of the bulge 34, here as a tube segment 36 shown.
- FIG. 3 shows the top view of the bulge 34 as a spherical shape 35.
- the pointed mouth of the quarter hollow sphere 35 at the transition to Broadside 25 of the second immersion pouring part 21.
- the slot 13 is located at the mouth.
- the narrow side 33 is at an angle ⁇ to the run-up 22 inclined.
- FIG. 2 shows the view on the broad side 32 of the intermediate part 31.
- the bulge 34 is designed as a tubular segment 36 in the central region.
- the bulge 34 is designed as a quarter hollow ball 35.
- the speed vectors have one Component that allows part of the melt to flow back to the bath surface. Here they are guided to the center of the mold 51 and in the center of the mold 51 between the diving spout 21 and the broad side 25, and the broad side 52 of the mold 51 steered again in the direction of strand withdrawal.
- the narrow side 21 opens in relation to the mouth of the second immersion pouring part on the central axis I conical at an angle ⁇ .
- This angle a can be clearly above the possible 7 ° for free rays and can have a value of up to 15 ° assume ( Figure 5).
- FIG. 4 has one in the shade 22 of the first immersion pouring part 11 in the inlet 22 Flow body 62 or a bulge 61.
- the first immersion pouring part 11 is designed as a tube, the end of which is closed by a closure 27.
- a tubular segment 36 is arranged in the inner gusset between the end 27 and the tube 11.
- the Contour 37 is parabolic.
- the pipe segment meets from its mouth on the leading edge of a flow body 62.
- leading edge 64 is toward the inside of the flow body 62 arranged at an angle of 90 °.
- the trailing edge 65 this Flow body 62 also has an angle ⁇ of 90 °.
- the tube 11 On the right side, the tube 11 is closed by an inclined surface 38 which is led to the inlet 22 of the second immersion pouring part 21.
- the entry area 22 is designed as a bulge 61.
- the outer surface of the leading edge 64 has the same inclination angle as the inclined surface 38.
- the trailing edge 65 has an angle ⁇ of approximately 45 °.
- the Broadside 25 of the second immersion pouring part 21 has the same wall thickness as that Bump and jumps out in the area of the trailing edge 65.
- the free space 23 has the same size like the entire second immersion pouring part down to its mouth.
- FIG. 5 shows the top view of the section of the second one shown in FIG. 4 Immersion pouring part 21 with the constriction 61, 62.
- the Length I at a value of I 0.2 to 1.2 x D, corresponding to the diameter D. of the tubular first immersion pouring part 11.
- the angle ⁇ in upper range of the possible bevel ⁇ 0 to 40 °.
- the angle ⁇ is also selected larger than in Figures 2 and 3, with ⁇ between 0 to 15 ° can be.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Coating With Molten Metal (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Jet Pumps And Other Pumps (AREA)
- Devices For Dispensing Beverages (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Beeinflussung der Strömungsausbreitung einer metallischen Flüssigkeit, insbesondere Stahl, die von einem Schmelzenbehälter über einen ersten Tauchausgußteil, der einen polygonalen, ovalen oder kreisförmigen Querschnitt aufweist, und ein Zwischenteil durch einen zweiten Tauchausgußteil, der einen länglichen Querschnitt aufweist, geführt in eine stationäre Kokille zum Erzeugen von Brammen strömt.The invention relates to a method and a device for influencing the Flow propagation of a metallic liquid, especially steel, from a melt container via a first immersion pouring part, which has a polygonal, has oval or circular cross section, and an intermediate part through a second immersion pouring part, which has an elongated cross section, guided into a stationary mold flows to produce slabs.
Aus DE 37 09 188 ist ein Ausgießrohr für metallurgische Gefäße bekannt, welches
sich in einen oberen rohrförmigen Längenabschnitt und einen unteren rechteckigen
Längenabschnitteil unterteilt, wobei zwischen beiden Längenabschnitten ein
konischer Übergang vorgesehen ist. Der rechteckige Querschnitt kann dabei ein
Längen-/Breitenverhältnis von 20:1 bis 80:1 aufweisen.From
An der Mündung des Tauchausgußes ist ein Quersteg vorgesehen, der den flüssigen Stahl in die seitlichen Mündungsöffnungen leitet. Hierbei tritt der Stahl mit relativ hoher kinetischer Energie in die Kokille ein. Darüber hinaus ist der Quersteg hohem Verschleiß ausgesetzt.At the mouth of the immersion spout, a crossbar is provided which holds the liquid Steel leads into the side openings. Here the steel comes with relative high kinetic energy in the mold. In addition, the crossbar is high Exposed to wear.
Aus DE 43 20 723 ist ein Tauchausguß bekannt, der einen Formstein mit rohrförmiger Gestalt aufweist, welcher über ein konisches Bauteil mit einem unteren in die Schmelze eintauchenden rechteckigen Formstein verbunden ist. Im unteren Formstein sind im Strömungsquerschnitt Längsstege vorgesehen.From DE 43 20 723 a submerged nozzle is known which has a shaped stone with a tubular Form, which has a conical component with a lower in the Melt immersed rectangular shaped stone is connected. At the bottom Shaped stones are provided in the flow cross-section of longitudinal webs.
Im Bereich des Eintritts des unteren rechteckigen Formsteins ist ein Quersteg vorgesehen, welche die Schmelzenströmung in Richtung der Erweiterung des Strömungsschachtes auslenkt. Durch diesen als Prallplatte ausgestalteten Quersteg wird es in nachteiliger Weise zu starken Verwirbelungen der Schmelze kommen. In the area of the entry of the lower rectangular shaped stone is a cross bar provided which the melt flow in the direction of the expansion of the Deflects the duct. Through this cross bar designed as a baffle plate there is a disadvantageous strong turbulence in the melt.
Die Erfindung hat sich das Ziel gesetzt, die o.g. Nachteile zu vermeiden und mit einfachen Mitteln ein Verfahren und eine Vorrichtung betreffend einen Tauchausguß zur Führung von Metallschmelzen zu schaffen, mit dem die Turbulenz im Tauchausguß selber sowie in der Kokille und gleichzeitig die Eindringtiefe der zugeführten Schmelze in den in der Kokille befindlichen Sumpf minimiert wird.The invention has set itself the goal, the above. To avoid disadvantages and with simple means a method and an apparatus relating to a diving spout to create metal melts with which the turbulence in the Dipping spout itself and in the mold and at the same time the depth of penetration of the fed melt is minimized in the sump located in the mold.
Die Erfindung erreicht dieses Ziel durch die kennzeichnenden Merkmale des
Verfahrensanspruchs 1 und des Vorrichtungsanspruchs 5.The invention achieves this goal by the characterizing features of
Erfindungsgemäß wird bei einem Tauchausguß, dessen in die in der Kokille befindlichen Schmelze eintauchendes Mündungsteil einen länglichen Querschnitt aufweist, im Einlaufbereich dieses Tauchausgußteils der zentrale Volumenstrom reduziert. Diese Reduzierung des Volumenstroms wird durch Drosselung des zentralen Bereichs hervorgerufen, wobei gleichzeitig der Spreizwinkel des Flüssigkeitsstrahls vergrößert wird und zwar so weit, daß eine Rückströmung in den Seitenbereich des einen länglichen Querschnitt aufweisenden Tauchausgußteils im wesentlichen unterbleibt.According to the invention, in the case of a diving spout, which is in the mold located melt-immersed mouth part an elongated cross section has, the central volume flow in the inlet area of this immersion pouring part reduced. This reduction in volume flow is achieved by throttling the central area, while the spreading angle of the Liquid jet is enlarged and so far that a backflow in the Side region of the immersion pouring part having an elongated cross section in the essentially omitted.
Als Folge des Drosselns und gleichzeitigen Spreizens des zentralen Volumenstromes strömt die Schmelze aus diesem Tauchausgußteil mit einem Geschwindigkeitsprofil, dessen Geschwindigkeitsvektoren im Mündungszentrum kleiner sind als in den Bereichen der Schmalseiten.As a result of throttling and simultaneous spreading of the central volume flow the melt flows out of this immersion pouring part with a speed profile, whose velocity vectors in the muzzle center are smaller than in the Areas of the narrow sides.
Die durch den Tauchausguß zugeführte Menge trifft mit diesem eingestellten
Geschwindigkeitsprofil auf den in der Kokille befindlichen Sumpf, der entsprechend
der Strangabzugsgeschwindigkeit von 1 bis 10 m/min. abgezogen wird und dringt in
nur geringe Tiefen in diesen Flüssigsumpf ein entsprechend einer Mischungslänge
von
L = 0,2 bis 4 m.With this set speed profile, the quantity supplied by the immersion nozzle hits the sump located in the mold, which corresponds to the strand withdrawal speed of 1 to 10 m / min. is withdrawn and penetrates into this liquid sump at only shallow depths corresponding to a mixture length of
L = 0.2 to 4 m.
Durch das intensive Spreizen des zentralen Volumenstroms weist das Geschwindigkeitsprofil im Bereich der Schmalseiten an der Mündung des der im länglichen Querschnitt aufweisenden Tauchausgußteils Geschwindigkeitsvektoren auf, die Komponenten besitzen, die einen Rückstrom an den Schmalseiten der Kokille zulassen. Hierdurch wird eine ausreichende Menge frischer Schmelze dem Badspiegel in der Kokille zugeführt mit positivem Einfluß auf das auf der Oberfläche aufgebrachte Gießpulver. Darüberhinaus strömt mit nur geringer Bugwelle aber ausreichender Menge diese Schmelze zum Zentrum zwischen Tauchausguß und Kokille. Die Schmelzenströme vereinigen sich in der Mitte der Kokille und fließen dann in Strangabzugsrichtung in den Sumpf. Dort füllen sie den aus dem zweiten Tauchausgußteil austretenden Volumenstrom im Mündungszentrum auf.This is demonstrated by the intensive spreading of the central volume flow Speed profile in the area of the narrow sides at the mouth of the in elongated cross-section of immersion pouring part speed vectors on that have components that have a backflow on the narrow sides of the mold allow. This will provide a sufficient amount of fresh melt Bath level in the mold supplied with a positive influence on the surface applied mold powder. In addition, however, flows with only a small bow wave sufficient amount of this melt to the center between the immersion nozzle and Mold. The melt flows unite in the middle of the mold and then flow in the direction of withdrawal in the swamp. There they fill in the second one Diving pouring part emerging volume flow in the muzzle center.
Die Folge hiervon ist eine nahezu ebene und insgesamt nur geringe Eindringtiefe in den Sumpf mit dem Vorteil, daß beispielsweise bei einem Qualitätswechsel der Schmelze nur eine geringe Mischungslänge und damit ein kurzes Stück nicht gewollter Brammenqualität erzeugt wird.The consequence of this is an almost flat and overall only slight penetration depth in the swamp with the advantage that, for example, when changing quality Only melt a short mixture length and therefore not a short piece desired slab quality is produced.
Die Drosselung des zentralen Volumenstroms wird dadurch erreicht, daß der Bereich vor dem Eintritt in den einen länglichen Querschnitt aufweisenden Tauchausgußteil oder der Eintritt selber in besonderer Weise ausgestaltet wird. In jedem Fall wird der Freiraum ausreichend offengehalten, so daß immer eine definierte Menge im zentralen Bereich des zweiten Tauchausgußteils fließt.The throttling of the central volume flow is achieved in that the area before entering the immersion pouring part, which has an elongated cross section or the admission itself is designed in a special way. In any case, the Free space should be kept sufficiently open so that there is always a defined amount in the central area of the second immersion pouring part flows.
Zur Drosselung des zentralen Volumenstroms kann die Wandung der Breitseite des in Gießrichtung vor dem einen länglichen Querquerschnitt aufweisenden Tauchausgußteils angeordneten Zwischenteils eine konkave Ausbuchtung besitzen. In einer vorteilhaften Ausgestaltung ist diese Ausbuchtung in Form einer Viertelhohlkugel ausgestaltet. In einer weiteren Ausgestaltung besitzt sie die Form eines Rohrsegmentes mit vorgebbarer Kontur.To throttle the central volume flow, the wall of the broad side of the in Pouring direction in front of the one with an elongated cross section Immersion part arranged intermediate part have a concave bulge. In an advantageous embodiment, this bulge is in the form of a Quarter hollow sphere designed. In a further embodiment, it has the shape a pipe segment with a definable contour.
Die Drosselung wird auch erreicht durch eine Verengung des Freiraums des Eintritts des Tauchausgußteils. Diese Verengung kann durch Strömungskörper, die an der Breitseite des Tauchausgußteils angeordnet sind oder durch Einformung von Beulen bewirkt werden.The throttling is also achieved by narrowing the space of entry of the immersion pouring part. This constriction can be caused by flow bodies at the Wide side of the immersion pouring part are arranged or by molding dents be effected.
In vorteilhafter Weise hat die Verengung in eine Abmessung, deren Breite etwa dem Durchmesser des vorgeschalteten rohrförmigen Tauchausgußteil und in der Länge von 0,2 bis 1,2 mal seiner Breite entspricht. Advantageously, the narrowing has a dimension whose width is approximately the same Diameter of the upstream tubular immersion pouring part and in length from 0.2 to 1.2 times its width.
Die Anström- wie auch die Abströmkanten sind scharfkantig ausgebildet und weisen dabei einen Winkel β von der Anströmkante und der Innenwandung von 90 bis 150° auf. Die Ausformung des Zwischenteils und die Verengung können kombiniert werden. Bei dieser Kombination wird vorgeschlagen, die Kontur der Ausbuchtung des Zwischenteils der Anströmkante des Strömungselementes im zweiten Tauchausgußteil anzugleichen.The leading and trailing edges are sharp-edged and have thereby an angle β from the leading edge and the inner wall of 90 to 150 ° on. The shape of the intermediate part and the narrowing can be combined become. With this combination, it is proposed that the contour of the bulge of the Between the leading edge of the flow element in the second Align immersion pouring part.
Ein Beispiel der Erfindung ist in der beigefügten Zeichnung dargelegt. Dabei zeigen die
- Figur 1 - 3
- einen Tauchausguß mit Ausbuchtung
- Figur 4 - 5
- einen Tauchausguß mit Verengung
- Figure 1-3
- a diving spout with bulge
- Figure 4-5
- a diving spout with constriction
Dabei zeigen die Figuren 1 und 4 Längsschnitte und die Figuren 2, 3 und 5
Querschnitte eines Tauchausgusses, der sich aus einem ersten Tauchausgußteil 11,
einem Zwischenteil 31 und einem zweiten Tauchausgußteil 21 zusammensetzt. Die
Mittenachse ist mit I bezeichnet.Figures 1 and 4 show longitudinal sections and Figures 2, 3 and 5
Cross sections of an immersion nozzle, which is composed of a
Bei Verwendung gleicher Positionsziffern bei allen Figuren ist das erste
Tauchausgußteil 11 über einen Flansch 12 an einem Schmelzengefäß 41 befestigt.
Der Austritt 42 des Schmelzengefäßes 41 ist durch einen Stopfen 43 verschließbar.
Das erste Tauchausgußteil 11 besitzt einen runden, ovalen oder auch polygonalen
Querschnitt und ist über das Zwischenteil 31 mit dem zweiten Tauchausgußteil 21
verbunden welches Breitseiten 25 besitzt, die deutlich größer sind als
Schmalseiten 26. Im Bereich des Zwischenteils 31 weist der erste Tauchausgußteil 11
einen Schlitz 13 auf.When using the same item numbers in all figures, the first is
Der zweite Tauchausgußteil 21 ragt in eine Kokille 51 hinein, wobei die Mündung 28
in die sich in der Kokille 51 befindliche Schmelze S eintaucht. Auf der Schmelze S
befindet sich Gießpulver P.The second
In Figur 1 weist das Zwischenteil 31 eine Ausbuchtung 34 auf, die im rechten Teil als
Kugelform 35 und im linken Teil als Rohrsegment 36 ausgestaltet ist. In Figure 1, the
Auf der linken Seite der Figur 1 schließt sich unmittelbar an das runde
Tauchausgußteil 11 die Ausbuchtung 34 in Form eines Rohrsegmentes 36 an. Das
Rohrsegment 36 kann, bezogen auf seine Hauptachse II, einen konstanten Radius
aufweisen oder auch parabelförmig ausgestaltet sein.On the left-hand side of FIG. 1, the round one immediately follows
In der Figur 2 ist die Draufsicht der Ausbuchtung 34, hier als Rohrsegment 36
dargestellt.FIG. 2 shows the top view of the bulge 34, here as a
In der Figur 3 ist die Draufsicht der Ausbuchtung 34 als Kugelform 35 aufgezeigt.
Deutlich zu sehen ist die spitze Mündung der Viertelhohlkugel 35 beim Übergang zur
Breitseite 25 des zweiten Tauchausgußteils 21.FIG. 3 shows the top view of the bulge 34 as a
Im oberen Teil der Figuren 2 und 3 mündet das erste Tauchausgußteil 11, hier als
Rohr dargestellt, wobei sich an der Mündung der Schlitz 13 befindet. Am Beginn des
Schlitzes ist zu beiden Seiten der Schmalseite 33 das Zwischenteil 31 dargestellt, das
Breitseiten 32 abdeckelt. Die Schmalseite 33 ist unter einem Winkel γ zum Anlauf 22
geneigt.In the upper part of Figures 2 and 3, the first
In der Figur 2 ist die Ansicht auf die Breitseite 32 des Zwischenteils 31 dargestellt. Im
Zentralbereich ist die Ausbuchtung 34 als Rohrsegment 36 ausgestaltet. In der Figur
3 ist die Ausbuchtung 34 als Viertelhohlkugel 35 ausgestaltet.FIG. 2 shows the view on the
Die Pfeile in den Figuren 2 und 3 stellen die Geschwindigkeitsvektoren dar. Bei der
Figur 2 ist aufgezeigt, wie im Zentralbereich in Strömungsrichtung hinter dem
Drosselelement Schmelzenvolumen und -menge vermindert wird. Deutlich gespreizt
unter einem Spreizwinkel δ strömt die Schmelze in den zweiten Tauchausgußteil 21
hinein.The arrows in Figures 2 and 3 represent the speed vectors
Figure 2 shows how in the central area in the flow direction behind the
Throttle element melt volume and amount is reduced. Clearly spread
at a spreading angle δ, the melt flows into the second
Im Mündungsbereich des zweiten Tauchausgußteils weist das Geschwindigkeitsprofil im Bereich der Schmalseitenwände eine Form auf, die im Mündungszentrum eine geringere Geschwindigkeit besitzen.The speed profile points in the mouth area of the second immersion pouring part a shape in the area of the narrow side walls, a shape in the muzzle center have lower speed.
In der Kokille selber (Figur 3) besitzen die Geschwindigkeitsvektoren eine
Komponente, die einen Teil der Schmelze zurückströmen lassen zur Badoberfläche.
Hier werden sie zur Mitte der Kokille 51 geführt und im Zentrum der Kokille 51
zwischen Tauchausguß 21 und der Breitseite 25, und der Breitseite 52 der Kokille 51
wieder in Strangabzugsrichtung gelenkt.In the mold itself (Figure 3) the speed vectors have one
Component that allows part of the melt to flow back to the bath surface.
Here they are guided to the center of the
Die Schmalseite 21 öffnet sich zur Mündung des zweiten Tauchausgußteils in Bezug
auf die Mittenachse I konisch unter einem Winkel α. Dieser Winkel a kann deutlich
über den bei Freistrahlen möglichen 7 ° liegen und kann einen Wert bis zu 15 °
annehmen (Figur 5).The
Die Figur 4 weist im Schatten des ersten Tauchausgußteils 11 im Einlauf 22 einen
Strömungskörper 62 bzw. eine Beule 61 auf.FIG. 4 has one in the
In der linken Seite der Figur 4 ist das erste Tauchausgußteil 11 als Rohr ausgebildet,
dessen Ende durch einen Abschluß 27 verschlossen ist. Im inneren Zwickel zwischen
dem Abschluß 27 und dem Rohr 11 ist ein rohrförmiges Segment 36 angeordnet. Die
Kontur 37 ist parabelförmig ausgestaltet. Von seiner Mündung trifft das Rohrsegment
auf die Anströmkante eines Strömungskörpers 62.4, the first
Im vorliegenden Fall ist die Anströmkante 64 zur Innenseite des Strömungskörpers 62
unter einem Winkel von 90° angeordnet. Die Abströmkante 65 dieses
Strömungskörpers 62 besitzt ebenfalls einen Winkel β von 90°.In the present case, the leading
Auf der rechten Seite ist das Rohr 11 durch eine schräge Fläche 38 abgeschlossen
die zum Einlauf 22 des zweiten Tauchausgußteils 21 geführt ist. Der Einlaufbereich
22 ist als Beule 61 ausgestaltet. Die Außenfläche der Anströmkante 64 weist den
gleichen Neigungswinkel auf wie die schräge Fläche 38.On the right side, the
Die Abströmkante 65 besitzt im vorliegenden Fall einen Winkel β von etwa 45°. Die
Breitseite 25 des zweiten Tauchausgußteils 21 besitzt die gleiche Wandstärke wie die
Beule und springt im Bereich der Abströmkante 65 nach außen. In Strömungsrichtung
hinter den Strömungskörpern 61 bzw. 62 weist der Freiraum 23 die gleiche Größe auf
wie der gesamte zweite Tauchausgußteil bis hin zu seiner Mündung.In the present case, the trailing
Die Figur 5 zeigt die Draufsicht zum Schnitt des in Figur 4 dargestellten zweiten
Tauchausgußteils 21 mit der Verengung 61, 62. Im Schatten des ersten
Tauchausgußteils 11 im Einlaufbereich 22 des zweiten Tauchausgußteils 21 ist ein
Strömungskörper 62 angeordnet mit den Abmessungen A = I x D. Dabei liegt die
Länge I bei einem Wert von I = 0,2 bis 1,2 x D, entsprechend dem Durchmesser D
des rohrförmigen ersten Tauchausgußteils 11.FIG. 5 shows the top view of the section of the second one shown in FIG. 4
In der Figur 5 ist, anders als bei den vorhergehenden Figuren 2 und 3, der Winkel γ im oberen Bereich der möglichen Abschrägung γ = 0 bis 40°. Auch der Winkel α ist größer als in den Figuren 2 und 3 ausgewählt worden, wobei α zwischen 0 bis 15° betragen kann. In FIG. 5, unlike in the previous FIGS. 2 and 3, the angle γ in upper range of the possible bevel γ = 0 to 40 °. The angle α is also selected larger than in Figures 2 and 3, with α between 0 to 15 ° can be.
- 1111
- Erstes TauchausgußteilFirst immersion pouring part
- 1212th
- HalteflanschRetaining flange
- 1313
- Schlitzslot
- 2020th
- Tauchausguß AuslaufteilDipping spout outlet part
- 2121
- Zweites TauchausgußteilSecond immersion pouring part
- 2222
- Einlaufenema
- 2323
- Freiraumfree space
- 2424th
- VerengungNarrowing
- 2525th
- BreitseiteBroadside
- 2626
- SchmalseiteNarrow side
- 2727
- AbschlußGraduation
- 2828
- Mündungmuzzle
- 3131
- ZwischenteilIntermediate part
- 3232
- BreitseiteBroadside
- 3333
- Schmalseite/DeckeNarrow side / ceiling
- 3434
- Ausbuchtungbulge
- 3535
- ViertelhohlkugelQuarter hollow sphere
- 3636
- RohrsegmentPipe segment
- 3737
- Kontur der AusbuchtungContour of the bulge
- 3838
- Schräge FlächeSloping surface
- 4141
- SchmelzengefäßMelting vessel
- 4242
- Austrittexit
- 4343
- StopfenPlug
- 5151
- KokilleMold
- 5252
- BreitseiteBroadside
- 5353
- SchmalseiteNarrow side
- 6161
- Beulebump
- 6262
- Erster StrömungskörperFirst flow body
- 6363
- Zweiter StrömungskörperSecond flow body
- 6464
- AnströmkanteLeading edge
- 6565
- AbströmkanteTrailing edge
- II.
- MittenachseCenter axis
- IIII
- Hauptachse RohrsegmentMain axis pipe segment
- SS
- Schmelzemelt
- PP
- GießpulverMold powder
- II.
- Länge des StrömungselementesLength of the flow element
- αα
- Winkel zweites TauchausgußteilAngle of the second immersion pouring part
- ββ
- Winkel AnströmkanteAngle leading edge
- γγ
- Winkel DeckelzwischenteilAngle lid intermediate part
- δδ
- SpreizwinkelSpread angle
Claims (16)
- A method for influencing the flow spread of a molten metal, in particular steel, which flows in guided manner from a melt container (41) via a first immersion delivery portion (11), comprising a polygonal, oval or circular cross section, and an intermediate portion (31) through a second immersion delivery portion (21), comprising a rectangular cross section with broad sides (25) and narrow sides (26), into a stationary mould (51) for producing slabs, the central flow volume being reduced in the inlet area of the second immersion delivery portion (21),
characterised by the following features:a) at the same time as the reduction of the central flow volume in the inlet area of the second immersion delivery portion (21), the angle of spread (δ) of the jet of liquid is extended to such an extent that backflow in the lateral area of the intermediate portion (31) and the second immersion delivery portion is substantially prevented, andb) upon leaving the second immersion delivery portion (21), the melt exhibits a velocity profile, the velocity vectors of which are smaller in the orifice centre than in the areas of the narrow sides (26). - A method according to claim 1,
characterised in that
the velocity vectors in the area of the narrow sides after the orifice of the second immersion delivery portion has been left are combined with a component directed towards the narrow side of the mould, which ensures a specific backflow of the melt up to the surface of the metal in the mould, and the amount of melt is set such that the total melt penetrates into the liquid phase, present in the mould, of the strand being drawn off at a velocity of from 1 to 10 m/min to a depth corresponding to a mixing length (L) of L = 0.2 to 4 m. - A method according to claim 2,
characterised in that
the melt penetrates into the liquid phase, present in the mould, of the strand being drawn off at a velocity of from 4 to 5 m/min to a depth corresponding to a mixing length (L) of L = 0.2 to 2 m. - A method according to any one of the preceding claims,
characterised in that,
beneath the end of the mixing zone, the velocity vectors of the liquid phase are parallel and equal to the casting velocity. - An immersion delivery means for delivering molten metals, in particular steel, consisting of a first immersion delivery portion (11) connected with a melt vessel (41), which first immersion delivery portion (11) has a polygonal, oval or circular cross section, and a second immersion delivery portion (21) connected therewith via an intermediate portion (31), which second immersion delivery portion (21) has a rectangular cross section with broad sides (25) and narrow sides (26) and a cross-sectional area which is equal to or smaller than that of the first immersion delivery portion, the immersion delivery means projecting so far into a stationary mould for producing slabs that the orifice of the second immersion delivery portion dips into the melt, for carrying out the method according to any one of the preceding claims,
characterised in that,
in the area of the central axis (I) of the immersion delivery means, the intermediate portion (31) and/or the inlet (22) of the second immersion delivery portion (21) takes the form of a choke element, such that the main flow of melt (S) leaving the first immersion delivery portion (11) is choked. - An immersion delivery means according to claim 5,
characterised in that,
beneath the first immersion delivery portion (11), the wall of the broad side (32) of the intermediate portion (31) comprises a concave indentation (34). - An immersion delivery means according to claim 6,
characterised in that
the indentation (34) is spherical (35) in form and takes the form, in particular, of a quarter of a hollow sphere. - An immersion delivery means according to claim 6,
characterised in that
the indentation (34) takes the form of a tube segment (36), the main axis (II) of which extends parallel to the broad side (32) of the intermediate portion (31). - An immersion delivery means according to claim 8,
characterised in that
the contour (37) of the tube segment (36) is parabolic, wherein the smaller radius is inclined towards the inlet (22) of the second immersion delivery portion (21). - An immersion delivery means according to claim 5,
characterised in that
the end (27) terminating the upper edges of the broad sides (25) is inclined at an angle γ of from 0 to 40°. - An immersion delivery means according to claim 5,
characterised in that
a narrowed portion (24) is provided beneath the first immersion delivery portion (11) in the space (23) between the broad sides (25) of the second immersion delivery portion (21). - An immersion delivery means according to claim 11,
characterised in that
the narrowed portion (24) is formed by bulge portions (61) of the broad side walls (25) extending into the space (23) in the second immersion delivery portion (21). - An immersion delivery means according to claim 11,
characterised in that
the narrowed portion (24) is formed by flow members (62) extending into the space (23) in the second immersion delivery portion (21). - An immersion delivery means according to claim 12 or 13,
characterised in that
the narrowed portion (24) extends in the flow direction by a length (I),
where I > 0.2 to 1.2 x D,
where D = diameter of the tubular first immersion delivery portion. - An immersion delivery means according to claim 11,
characterised in that
the inflow edge (64) and/or the outflow edge (65) of the narrowed portion (24) are/is sharp-edged, exhibiting an angle β = 90 to 150°. - An immersion delivery means according to claims 6 and 14,
characterised in that,
when the indentation (34) in the intermediate portion (31) and the narrowed portion (24) in the space (23) in the second immersion delivery portion (21) are used, the contour of the inflow area of the narrowed portion (24) follows the contour (37) of the indentation (34).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19623787A DE19623787C2 (en) | 1996-06-04 | 1996-06-04 | Method and device for pouring steel from a dip spout |
| DE19623787 | 1996-06-04 | ||
| PCT/DE1997/001093 WO1997046344A1 (en) | 1996-06-04 | 1997-05-29 | Process and device for pouring of steel from an immersion outlet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0902736A1 EP0902736A1 (en) | 1999-03-24 |
| EP0902736B1 true EP0902736B1 (en) | 2000-02-23 |
Family
ID=7796971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97926968A Expired - Lifetime EP0902736B1 (en) | 1996-06-04 | 1997-05-29 | Process and device for pouring of steel from an immersion outlet |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US6260740B1 (en) |
| EP (1) | EP0902736B1 (en) |
| JP (1) | JP3174348B2 (en) |
| KR (1) | KR100355001B1 (en) |
| CN (1) | CN1087200C (en) |
| AT (1) | ATE189868T1 (en) |
| AU (1) | AU3164197A (en) |
| BR (1) | BR9709536A (en) |
| CA (1) | CA2257139C (en) |
| DE (2) | DE19623787C2 (en) |
| ES (1) | ES2142686T3 (en) |
| RU (1) | RU2153956C1 (en) |
| WO (1) | WO1997046344A1 (en) |
| ZA (1) | ZA974485B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19724232C2 (en) * | 1997-06-03 | 1999-04-15 | Mannesmann Ag | Method and device for producing slabs |
| RU2200645C2 (en) * | 2001-06-08 | 2003-03-20 | Открытое акционерное общество "Новолипецкий металлургический комбинат" | Apparatus for continuous steel casting |
| DE10240491A1 (en) * | 2002-09-03 | 2004-01-15 | Refractory Intellectual Property Gmbh & Co.Kg | Refractory ceramic immersion tube used in a continuous casting installation comprises a through-channel for connecting a feed opening for a metal melt on one end to an outlet opening for the metal melt on another end |
| KR20170005469A (en) * | 2014-05-21 | 2017-01-13 | 노벨리스 인크. | Non-contacting molten metal flow control |
| CN114749650B (en) * | 2022-05-08 | 2024-08-09 | 新疆八一钢铁股份有限公司 | Parabolic long-life continuous casting immersion nozzle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1294474A1 (en) * | 1983-01-03 | 1987-03-07 | Днепропетровский Завод Металлургического Оборудования | Refractory ladle for pouring metal |
| JPS62197252A (en) * | 1986-02-25 | 1987-08-31 | Kawasaki Steel Corp | Submerged nozzle for continuous casting |
| DE3709188A1 (en) * | 1987-03-20 | 1988-09-29 | Mannesmann Ag | POURING PIPE FOR METALLURGICAL VESSELS |
| DE4320723A1 (en) * | 1993-06-23 | 1995-01-05 | Didier Werke Ag | Immersion spout |
| DE19512208C1 (en) * | 1995-03-21 | 1996-07-18 | Mannesmann Ag | Immersed spout for pouring metal |
-
1996
- 1996-06-04 DE DE19623787A patent/DE19623787C2/en not_active Expired - Fee Related
-
1997
- 1997-05-22 ZA ZA9704485A patent/ZA974485B/en unknown
- 1997-05-29 DE DE59701153T patent/DE59701153D1/en not_active Expired - Lifetime
- 1997-05-29 KR KR1019980709857A patent/KR100355001B1/en not_active Expired - Fee Related
- 1997-05-29 BR BR9709536A patent/BR9709536A/en not_active IP Right Cessation
- 1997-05-29 WO PCT/DE1997/001093 patent/WO1997046344A1/en not_active Ceased
- 1997-05-29 US US09/194,987 patent/US6260740B1/en not_active Expired - Lifetime
- 1997-05-29 AU AU31641/97A patent/AU3164197A/en not_active Abandoned
- 1997-05-29 CN CN97195276A patent/CN1087200C/en not_active Expired - Fee Related
- 1997-05-29 EP EP97926968A patent/EP0902736B1/en not_active Expired - Lifetime
- 1997-05-29 AT AT97926968T patent/ATE189868T1/en active
- 1997-05-29 ES ES97926968T patent/ES2142686T3/en not_active Expired - Lifetime
- 1997-05-29 CA CA002257139A patent/CA2257139C/en not_active Expired - Fee Related
- 1997-05-29 RU RU99100098/02A patent/RU2153956C1/en not_active IP Right Cessation
- 1997-05-29 JP JP50009498A patent/JP3174348B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2142686T3 (en) | 2000-04-16 |
| JP2000502614A (en) | 2000-03-07 |
| KR100355001B1 (en) | 2002-12-26 |
| WO1997046344A1 (en) | 1997-12-11 |
| DE59701153D1 (en) | 2000-03-30 |
| ATE189868T1 (en) | 2000-03-15 |
| EP0902736A1 (en) | 1999-03-24 |
| JP3174348B2 (en) | 2001-06-11 |
| US6260740B1 (en) | 2001-07-17 |
| DE19623787C2 (en) | 1998-07-02 |
| BR9709536A (en) | 1999-08-10 |
| KR20000016284A (en) | 2000-03-25 |
| ZA974485B (en) | 1997-12-29 |
| RU2153956C1 (en) | 2000-08-10 |
| CN1087200C (en) | 2002-07-10 |
| DE19623787A1 (en) | 1997-12-11 |
| CA2257139C (en) | 2006-09-19 |
| CA2257139A1 (en) | 1997-12-11 |
| CN1221363A (en) | 1999-06-30 |
| AU3164197A (en) | 1998-01-05 |
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