EP0904873B1 - Gate geometry of a continuous casting mould for metal - Google Patents
Gate geometry of a continuous casting mould for metal Download PDFInfo
- Publication number
- EP0904873B1 EP0904873B1 EP98117587A EP98117587A EP0904873B1 EP 0904873 B1 EP0904873 B1 EP 0904873B1 EP 98117587 A EP98117587 A EP 98117587A EP 98117587 A EP98117587 A EP 98117587A EP 0904873 B1 EP0904873 B1 EP 0904873B1
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- EP
- European Patent Office
- Prior art keywords
- chill mould
- side walls
- section
- wide side
- mould 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
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- 238000009749 continuous casting Methods 0.000 title claims description 7
- 239000002184 metal Substances 0.000 title claims description 3
- 238000005266 casting Methods 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0408—Moulds for casting thin slabs
Definitions
- the invention relates to a mold for the continuous casting of metal a cooled broadside and narrow side walls, funnel-shaped in the casting direction to the format of the cast strand tapered pouring area.
- the dimensions of the pouring area are essentially determined by the cross section of the strand to be cast, the dimensions of the Pouring tube and its immersion depth in the melt determined.
- EP 0 268 910 B1 proposes that below the casting level to guide thin strand shell without deformation by the broad side walls in the pouring area in a first section essentially run parallel to each other and in an adjoining one Section can be traced back to the thickness of the casting format, whereby the first section to below that to be set at the casting shop Casting level in the area of the first strand shell formation enough.
- the total shape change imposed on the strand by the mold, which is used to reduce the strand to the thickness of the Casting format is required extends to the subsequent Section by inclined or curved surfaces or combination the same is formed.
- EP 0 552 501 A2 discloses a mold for the continuous casting of Steel band, in which the broad side walls are funnel-shaped Form the pouring area to the narrow side walls and in the pouring direction is reduced to the format of the cast tape.
- the Curvature of the funnel-shaped pouring area is due to lateral Circular arcs and middle ones connected to them at tangent points Arcs determined.
- the tensile and bending stresses of the strand shell are Radii of the lateral arcs in a minimum of 100 mm from the The upper part of the mold downward-reaching section remains constant educated.
- DE 39 07 351 A1 discloses a proposal, the pouring funnel a mold so that the deformation of the metal casting is distributed over the greatest possible route length and constrictions as well as cracks in the strand shell of the metal casting strand be avoided.
- the Contour of the inner wall of the pouring funnel in the direction of the passage is formed by three tangential arcs, the radii of which gradually increase in the direction of passage of the strand, merge into the contour of the inner wall of the mold.
- One if possible uniform distribution of the change in shape of the strand shell in one pouring area shaped in this way is achieved in that the Radii in the direction of pass through with the same or different Factor increase.
- the present invention is based on the aforementioned prior art the task, another funnel geometry of a mold specify the friction and wear between the strand shell and mold walls are reduced even better and especially in the Strand shell formation of a comparatively high shrinkage tending steel an even more significant reduction in error the slab surface as a result of the most uniform possible Setting the shape change is realized.
- the invention is based on the finding that in the pouring area by the transition from a horizon to an underlying one Horizon-related change in length of the mold contour on each Horizon has a maximum and that this maximum is above average local deformation or increased tendency to local Gap formation between the strand and the mold wall corresponds. from that shows that the pouring area is at least a maximum of Changes in length of the horizontal mold contour and that a distribution of the shape change as evenly as possible over the pouring area is achieved by making this maximum possible is low.
- the object is achieved with the invention in that in The inner contours of the broad side walls in the pouring direction from top to bottom at least two points each with the property exhibit that they determine a straight line along which the Inner contours of these broad side walls with at least one concave and with at least one convex section of any order are trained.
- the Inner contours of the broad side walls at least along a partial length one from the upper edge of the mold to the lower edge of the mold drawn straight lines in the casting direction from top to bottom with at least one concave section and with at least one convex Section of any sequence are formed.
- the object is also achieved with the invention in that in the funnel area along the inner contours of the broad side walls one the upper edge of the mold and the beginning of the lower section straight lines connecting the broad side walls in the casting direction from above down with at least one concave section and with at least one a convex section of any sequence are formed.
- concave sections and convex sections can be used the broad side walls merge directly into one another.
- Each of the concave sections or convex sections of the broad sidewalls both one in their Have course constant as well as a variable curvature.
- An embodiment of the invention provides that the inner contours the broad side walls over the concave or over the convex Sections an arcuate course or a trigonometric, for example, have a sinusoidal shape.
- the lower section of the mold has a parallel walled area has a particularly smooth transition between Funnel area and subsequent parallel-walled area realizes that the lower convex or concave area with a terminal lower circular arc in the rectilinear area with passes over a steady course.
- An embodiment of the funnel geometry essential to the invention results from the measure that the curvatures of the individual sections of the broad side walls are formed with such radii that the greatest local change in length delta max (% / m) during the transition from a horizon to an underlying horizon is four times the value local length changes averaged over the funnel area without consideration of parallel-walled sections, in particular not exceeding a value of 2.0% / m.
- the invention provides a use of the claimed Chill mold for continuous casting from comparatively high to extremely high Peritectic carbon steels tend to shrink and austenitic stainless steels.
- the three different funnel contours shown in Fig. 1 the broad side wall of a mold have a funnel-shaped shape Pouring direction tapered to the format of the cast strand A or a funnel-shaped in the casting direction to the format of the cast strand tapered pouring area B and one subsequent essentially parallel-walled area C.
- This The mold area or the mold outlet need not be parallel Have exit surfaces or exit edges.
- the lower mold area or the lower mold outlet can be in the middle area quite a small curvature of 1 to 15 mm per broad side wall exhibit.
- funnel area A are the funnel contours of the broad side walls 4 along the upper edge of the mold 1 and the lower edge of the mold 3 connecting straight lines from top to bottom first with a concave Section a and then with a convex section b educated. It can be seen that the inner contour 4 of the Broad sidewalls over sections a and b have a sinusoidal shape Has history.
- the funnel contours of the broad side walls 4 'or 4''along a straight line connecting the upper edge 1 of the mold and the beginning of the parallel-walled area 2 are first with a concave section a' or a '' and then with one convex section b 'or b''andc''formed.
- the inner contours 4 'or 4''of the broad side walls have a sinusoidal course over the sections a' and b 'or a''andb''.
- Fig. 1 also shows that the convex portion b '' with a terminal, lower circular arc c '' in the parallel-walled area d '' passes with a steady course.
- the invention is still essential for the funnel geometry Measure that each of the concave sections a, a 'and a' 'and the convex sections b, b 'and b' 'both in their course have constant, as well as a variable curvature can.
- the curvatures of the sections a, b, a ', b', a '', b '', c '' are designed with radii such that the greatest local change in length occurs when changing from a horizon to an underlying horizon delta max a value of 2.0% / m and at the same time does not exceed four times the local length changes averaged over the funnel area without taking into account the parallel-walled sections d 'and d''.
- 3a and 3b show the same picture for the same mold conventional design, in which the vertical mold contour of the Broadside is formed by a straight line.
- the maximum local change in length of 2.44% / m is essential greater. It can also be seen that the distribution of the shape change much more uneven and in the area of the upper edge of the mold, where strand shell formation is most sensitive is particularly large. It is precisely these disadvantages with the invention avoided.
Abstract
Description
Die Erfindung betrifft eine Kokille zum Stranggießen von Metall mit einem gekühlte Breitseiten- und Schmalseitenwände aufweisenden, trichterförmig in Gießrichtung zum Format des gegossenen Stranges verjüngten Eingießbereich.The invention relates to a mold for the continuous casting of metal a cooled broadside and narrow side walls, funnel-shaped in the casting direction to the format of the cast strand tapered pouring area.
Die Abmessungen des Eingießbereichs werden im wesentlichen durch den Querschnitt des zu vergießenden Stranges, die Abmessungen des Gießrohres und dessen Eintauchtiefe in die Schmelze bestimmt.The dimensions of the pouring area are essentially determined by the cross section of the strand to be cast, the dimensions of the Pouring tube and its immersion depth in the melt determined.
Aufgrund der trichterförmigen Formgebung der Breitseitenwände findet in Gießrichtung nicht nur eine Verjüngung, sondern auch eine Formänderung des Strangquerschnittes statt. Infolgedessen werden der Strangschale beim Durchlaufen einer Trichterkokille im Gegensatz zu einer herkömmlichen Stranggießkokille mit ebenen Wänden zusätzliche Verformungen aufgezwungen. Um die Entstehung von Oberflächenfehlern des Gußproduktes zu vermeiden, dürfen diese zusätzlichen Verformungen einen bestimmten Grenzwert nicht überschreiten, damit die Strangschale nicht überlastet wird und eine über den Strangquerschnitt gleichmäßige Wärmeabfuhr gewährleistet bleibt.Due to the funnel-shaped shape of the broad side walls takes place not only a taper in the casting direction, but also a change in shape of the strand cross section. As a result, the In contrast, strand shell when passing through a funnel mold additional to a conventional continuous casting mold with flat walls Deformations imposed. About the appearance of surface defects to avoid the cast product, these additional Deformations do not exceed a certain limit, so the strand shell is not overloaded and one over the strand cross section uniform heat dissipation is guaranteed.
Die EP 0 268 910 B1 schlägt vor, die unterhalb des Gießspiegels noch dünne Strangschale verformungsfrei zu führen, indem die Breitseitenwände im Eingießbereich in einem ersten Abschnitt im wesentlichen parallel zueinander verlaufen und in einem sich daran anschließenden Abschnitt auf die Dicke des Gießformates zurückgeführt werden, wobei der erste Abschnitt bis unterhalb der beim Gießbetrieb einzustellenden Gießspiegelebene in den Bereich der ersten Strangschalenbildung reicht. Die gesamte dem Strang von der Kokille auferlegte Formänderung, welche für die Reduzierung des Stranges auf die Dicke des Gießformates erforderlich ist, erstreckt sich auf den anschließenden Abschnitt, der durch geneigte oder gewölbte Flächen oder Kombination derselben gebildet wird.EP 0 268 910 B1 proposes that below the casting level to guide thin strand shell without deformation by the broad side walls in the pouring area in a first section essentially run parallel to each other and in an adjoining one Section can be traced back to the thickness of the casting format, whereby the first section to below that to be set at the casting shop Casting level in the area of the first strand shell formation enough. The total shape change imposed on the strand by the mold, which is used to reduce the strand to the thickness of the Casting format is required extends to the subsequent Section by inclined or curved surfaces or combination the same is formed.
Die EP 0 552 501 A2 offenbart eine Kokille zum Stranggießen von Stahlband, bei der die Breitseitenwände einen trichterförmigen Eingießbereich bilden, der zu den Schmalseitenwänden und in Gießrichtung auf das Format des gegossenen Bandes reduziert ist. Die Wölbung des trichterförmigen Eingießbereiches ist durch seitliche Kreisbögen und an Tangentenpunkten mit diesen verbundene mittlere Kreisbögen bestimmt. Zur Reibungs- und Verschleißminderung und Reduzierung der Zug- und Biegebeanspruchungen der Strangschale sind die Radien der seitlichen Kreisbögen in einem mindestens 100 mm von der Kokillenoberkante abwärts reichenden Abschnitt gleichbleibend ausgebildet.EP 0 552 501 A2 discloses a mold for the continuous casting of Steel band, in which the broad side walls are funnel-shaped Form the pouring area to the narrow side walls and in the pouring direction is reduced to the format of the cast tape. The Curvature of the funnel-shaped pouring area is due to lateral Circular arcs and middle ones connected to them at tangent points Arcs determined. For reducing and reducing friction and wear the tensile and bending stresses of the strand shell are Radii of the lateral arcs in a minimum of 100 mm from the The upper part of the mold downward-reaching section remains constant educated.
Die DE 39 07 351 A1 offenbart einen Vorschlag, den Eingießtrichter einer Kokille so auszubilden, daß die Verformung des Metallgießstranges auf eine größtmögliche Streckenlänge verteilt wird und Einschnürungen sowie Rißbildungen in der Strangschale des Metallgießstranges vermieden werden. Dies wird dadurch erreicht, daß die Kontur der Innenwandung des Eingießtrichters in Strangdurchlaufrichtung durch drei sich tangential berührende Kreisbögen gebildet wird, deren Radien, in Strangdurchlaufrichtung allmählich größer werdend, in die Kontur der Innenwandung der Kokille übergehen. Eine möglichst gleichmäßige Verteilung der Formänderung der Strangschale in einem derart geformten Eingießbereich wird dadurch erreicht, daß deren Radien in Strangdurchlaufrichtung mit gleichem oder ungleichem Faktor zunehmen.DE 39 07 351 A1 discloses a proposal, the pouring funnel a mold so that the deformation of the metal casting is distributed over the greatest possible route length and constrictions as well as cracks in the strand shell of the metal casting strand be avoided. This is achieved in that the Contour of the inner wall of the pouring funnel in the direction of the passage is formed by three tangential arcs, the radii of which gradually increase in the direction of passage of the strand, merge into the contour of the inner wall of the mold. One if possible uniform distribution of the change in shape of the strand shell in one pouring area shaped in this way is achieved in that the Radii in the direction of pass through with the same or different Factor increase.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine weitere Trichtergeometrie einer Kokille anzugeben, durch welche Reibung und Verschleiß zwischen Strangschale und Kokillenwänden noch besser vermindert und insbesondere bei der Strangschalenbildung eines zu vergleichsweise hoher Schrumpfung neigenden Stahles eine noch deutlichere Verringerung des Fehlerbefalls der Brammenoberfläche infolge einer möglichst gleichmäßigen Einstellung der Formänderung verwirklicht wird.The present invention is based on the aforementioned prior art the task, another funnel geometry of a mold specify the friction and wear between the strand shell and mold walls are reduced even better and especially in the Strand shell formation of a comparatively high shrinkage tending steel an even more significant reduction in error the slab surface as a result of the most uniform possible Setting the shape change is realized.
Der Erfindung liegt die Erkenntnis zugrunde, daß im Eingießbereich die durch den Übergang von einem Horizont auf einen darunterliegenden Horizont bedingte Längenänderung der Kokillenkontur auf jedem Horizont ein Maximum aufweist und daß diesem Maximum eine überdurchschnittliche lokale Verformung bzw. verstärkte Neigung zur lokalen Spaltbildung zwischen Strang und Kokillenwand entspricht. Daraus geht hervor, daß der Eingießbereich mindestens ein Maximum der Längenänderung der horizontalen Kokillenkontur aufweist und daß eine möglichst gleichmäßige Verteilung der Formänderung über den Eingießbereich dadurch erzielt wird, daß dieses Maximum möglichst gering ist.The invention is based on the finding that in the pouring area by the transition from a horizon to an underlying one Horizon-related change in length of the mold contour on each Horizon has a maximum and that this maximum is above average local deformation or increased tendency to local Gap formation between the strand and the mold wall corresponds. from that shows that the pouring area is at least a maximum of Changes in length of the horizontal mold contour and that a distribution of the shape change as evenly as possible over the pouring area is achieved by making this maximum possible is low.
Die Lösung der Aufgabe gelingt mit der Erfindung dadurch, daß im Trichterbereich die Innenkonturen der Breitseitenwände in Gießrichtung von oben nach unten wenigstens je zwei Punkte mit der Eigenschaft aufweisen, daß sie eine Gerade bestimmen, entlang derer die Innenkonturen dieser Breitseitenwände mit wenigstens einem konkaven und mit wenigstens einem konvexen Abschnitt beliebiger Abfolge ausgebildet sind.The object is achieved with the invention in that in The inner contours of the broad side walls in the pouring direction from top to bottom at least two points each with the property exhibit that they determine a straight line along which the Inner contours of these broad side walls with at least one concave and with at least one convex section of any order are trained.
Erfindungsgemäß wird vorgeschlagen, daß im Trichterbereich die Innenkonturen der Breitseitenwände wenigstens entlang einer Teillänge einer von der Kokillenoberkante bis zur Kokillenunterkante gezogenen Geraden in der Gießrichtung von oben nach unten mit wenigstens einem konkaven Abschnitt und mit wenigstens einem konvexen Abschnitt beliebiger Abfolge ausgebildet sind.According to the invention it is proposed that the Inner contours of the broad side walls at least along a partial length one from the upper edge of the mold to the lower edge of the mold drawn straight lines in the casting direction from top to bottom with at least one concave section and with at least one convex Section of any sequence are formed.
Die Lösung der Aufgabe gelingt mit der Erfindung auch dadurch, daß im Trichterbereich die Innenkonturen der Breitseitenwände entlang einer die Kokillenoberkante und den Beginn des unteren Abschnitts der Breitseitenwände verbindenden Geraden in Gießrichtung von oben nach unten mit wenigstens einem konkaven Abschnitt und mit wenigstens einem konvexen Abschnitt beliebiger Abfolge ausgebildet sind.The object is also achieved with the invention in that in the funnel area along the inner contours of the broad side walls one the upper edge of the mold and the beginning of the lower section straight lines connecting the broad side walls in the casting direction from above down with at least one concave section and with at least one a convex section of any sequence are formed.
Dabei können mit Vorteil konkave Abschnitte und konvexe Abschnitte der Breitseitenwände unmittelbar ineinander übergehen.Advantageously, concave sections and convex sections can be used the broad side walls merge directly into one another.
Vorteilhaft ist auch, wenn in Gießrichtung von oben nach unten zuerst der konkave Abschnitt und dann der konvexe Abschnitt bis zum Kokillenaustritt angeordnet sind.It is also advantageous if in the casting direction from top to bottom first the concave section and then the convex section up to Mold exit are arranged.
Dabei kann mit Vorteil jeder der konkaven Abschnitte bzw. der konvexen Abschnitte der Breitseitenwände sowohl eine in deren Verlauf gleichbleibende als auch eine veränderliche Krümmung aufweisen.Each of the concave sections or convex sections of the broad sidewalls both one in their Have course constant as well as a variable curvature.
Eine Ausgestaltung der Erfindung sieht vor, daß die Innenkonturen der Breitseitenwände über die konkaven bzw. über die konvexen Abschnitte einen kreisbogenförmigen Verlauf oder einen trigonometrischen, beispielsweise einen sinusförmigen Verlauf aufweisen.An embodiment of the invention provides that the inner contours the broad side walls over the concave or over the convex Sections an arcuate course or a trigonometric, for example, have a sinusoidal shape.
Wenn der untere Abschnitt der Kokille einen parallelwandigen Bereich aufweist, wird ein besonders reibungsfreier Übergang zwischen Trichterbereich und anschließendem parallelwandigem Bereich dadurch verwirklicht, daß der untere konvexe oder konkave Bereich mit einem endständigen unteren Kreisbogen in den geradlinigen Bereich mit einem stetigen Verlauf übergeht.If the lower section of the mold has a parallel walled area has a particularly smooth transition between Funnel area and subsequent parallel-walled area realizes that the lower convex or concave area with a terminal lower circular arc in the rectilinear area with passes over a steady course.
Eine erfindungswesentliche Ausgestaltung der Trichtergeometrie ergibt sich durch die Maßnahme, daß die Krümmungen der einzelnen Abschnitte der Breitseitenwände mit solchen Radien ausgebildet sind, daß die größte lokale Längenänderung Deltamax (%/m) beim Übergang von einem Horizont auf einen darunterliegenden Horizont den vierfachen Wert der über den Trichterbereich ohne.Berücksichtigung von parallelwandigen Abschnitten gemittelten lokalen Längenänderungen, insbesondere einen Wert von 2,0 %/m nicht übersteigt.An embodiment of the funnel geometry essential to the invention results from the measure that the curvatures of the individual sections of the broad side walls are formed with such radii that the greatest local change in length delta max (% / m) during the transition from a horizon to an underlying horizon is four times the value local length changes averaged over the funnel area without consideration of parallel-walled sections, in particular not exceeding a value of 2.0% / m.
Und schließlich sieht die Erfindung eine Verwendung der beanspruchten Kokille für das Stranggießen von vergleichsweise zu extrem hoher Schrumpfung neigenden peritektischen Kohlenstoffstählen und austenitischen nichtrostenden Stählen vor.Finally, the invention provides a use of the claimed Chill mold for continuous casting from comparatively high to extremely high Peritectic carbon steels tend to shrink and austenitic stainless steels.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung von Längenänderungen der Innenkontur einer Kokille in unterschiedlichen Horizonten des Eingießbereichs durch deren Darstellung in den dreidimensionalen Diagrammen.Further details, features and advantages of the invention emerge from the following explanation of changes in length of the Inner contour of a mold in different horizons of the Pouring area by their representation in the three-dimensional Diagrams.
Es zeigen:
- Fig. 1:
- im Schnitt entlang der Mittelachse drei verschiedene
trichterförmige Innenkonturen 4, 4', 4'' der Breitseitenwand einer Kokille nach der Erfindung - Fig. 2 a:
- Längenänderungen der Innenkontur im Eingießbereich sowohl in unterschiedlichen Abständen von der Kokillenoberkante als auch von der Kokillenmitte.
- Fig. 2 b:
- Eine andere Darstellung der Längenänderung, ebenfalls in Abhängigkeit der Abstände von der Kokillenoberkante wie der Kokillenmitte,
- Fig. 3 a:
- Längenänderungen der Innenkontur im Eingießbereich einer herkömmlichen Kokille, ebenfalls im Abstand sowohl der Kokillenoberkante als auch von der Kokillenmitte.
- Fig. 3 b:
- in anderer Darstellung Längenänderungen der Innenkontur im Eingießbereich einer herkömmlichen Kokille in Abhängigkeit sowohl des Abstandes von der Kokillenoberkante, als auch von der Kokillenmitte.
- Fig. 1:
- in section along the central axis three different funnel-shaped
inner contours 4, 4 ', 4''of the broad side wall of a mold according to the invention - 2 a:
- Changes in length of the inner contour in the pouring area both at different distances from the upper edge of the mold and from the center of the mold.
- Fig. 2 b:
- Another representation of the change in length, also depending on the distances from the upper edge of the mold and the center of the mold,
- 3 a:
- Changes in the length of the inner contour in the pouring area of a conventional mold, also at a distance from both the upper edge of the mold and the center of the mold.
- 3b:
- in another representation, changes in length of the inner contour in the pouring area of a conventional mold depending on both the distance from the upper edge of the mold and from the center of the mold.
Die in Fig. 1 dargestellten drei unterschiedlichen Trichterkonturen der Breitseitenwand einer Kokille besitzen einen trichterförmig in Gießrichtung zum Format des gegossenen Stranges verjüngten Eingießbereich A oder einen trichterförmig in Gießrichtung zum Format des gegossenen Stranges verjüngten Eingießbereich B und einen sich anschließenden im wesentlichen parallelwandigen Bereich C. Dieser Kokillenbereich bzw. der Kokillenaustritt muß nicht parallele Austrittsflächen bzw. Austrittskanten haben. Der untere Kokillenbereich bzw. der untere Kokillenaustritt kann im mittleren Bereich durchaus eine kleine Wölbung von 1 bis 15 mm pro Breitseitenwand aufweisen.The three different funnel contours shown in Fig. 1 the broad side wall of a mold have a funnel-shaped shape Pouring direction tapered to the format of the cast strand A or a funnel-shaped in the casting direction to the format of the cast strand tapered pouring area B and one subsequent essentially parallel-walled area C. This The mold area or the mold outlet need not be parallel Have exit surfaces or exit edges. The lower mold area or the lower mold outlet can be in the middle area quite a small curvature of 1 to 15 mm per broad side wall exhibit.
Im Trichterbereich A sind die Trichterkonturen der Breitseitenwände
4 entlang einer die Kokillenoberkante 1 und die Kokillenunterkante
3 verbindenden Geraden von oben nach unten zuerst mit einem konkaven
Abschnitt a und daran anschließend mit einem konvexen Abschnitt b
ausgebildet. Dabei ist ersichtlich, daß die Innenkontur 4 der
Breitseitenwände über die Abschnitte a und b einen sinusförmigen
Verlauf aufweist.In funnel area A are the funnel contours of the
Im Trichterbereich B sind die Trichterkonturen der Breitseitenwände
4' bzw. 4'' entlang einer die Kokillenoberkante 1 und den Beginn
des parallelwandigen Bereichs 2 verbindenden Geraden von oben nach
unten zuerst mit einem konkaven Abschnitt a' bzw. a'' und daran
anschließend mit einem konvexen Abschnitt b' bzw. b'' und c''
ausgebildet.
Auch in diesem Beispiel weisen die Innenkonturen 4' bzw. 4'' der
Breitseitenwände über die Abschnitte a' und b' bzw. a'' und b''
einen sinusförmigen Verlauf auf.In the funnel area B, the funnel contours of the broad side walls 4 'or 4''along a straight line connecting the
In this example, too, the inner contours 4 'or 4''of the broad side walls have a sinusoidal course over the sections a' and b 'or a''andb''.
Fig. 1 zeigt außerdem, daß der konvexe Abschnitt b'' mit einem endständigen, unteren Kreisbogen c'' in den parallelwandigen Bereich d'' mit einem stetigen Verlauf übergeht. Erfindungswesentlich für die Trichtergeometrie ist weiterhin die Maßnahme, daß jeder der konkaven Abschnitte a, a' und a'' bzw. der konvexen Abschnitte b, b' und b'' sowohl eine in deren Verlauf gleichbleibende, als auch eine veränderliche Krümmung aufweisen kann.Fig. 1 also shows that the convex portion b '' with a terminal, lower circular arc c '' in the parallel-walled area d '' passes with a steady course. The invention is still essential for the funnel geometry Measure that each of the concave sections a, a 'and a' 'and the convex sections b, b 'and b' 'both in their course have constant, as well as a variable curvature can.
Bei der untersuchten Trichtergeometrie sind die Krümmungen der Abschnitte a, b, a', b', a'', b'', c'' mit solchen Radien ausgebildet, daß die größte lokale Längenänderung beim Übergang von einem Horizont auf einen darunterliegenden Horizont Deltamax einen Wert von 2,0 %/m und gleichzeitig den vierfachen Wert der über den Trichterbereich ohne Berücksichtigung der parallelwandigen Abschnitte d' und d'' gemittelten lokalen Längenänderungen nicht übersteigt.In the funnel geometry examined, the curvatures of the sections a, b, a ', b', a '', b '', c '' are designed with radii such that the greatest local change in length occurs when changing from a horizon to an underlying horizon delta max a value of 2.0% / m and at the same time does not exceed four times the local length changes averaged over the funnel area without taking into account the parallel-walled sections d 'and d''.
Fig. 2 a und Fig. 2 b zeigen im dreidimensionalen Diagramm die
Verteilung der Formänderung im Trichterbereich der Breitseitenwand
einer Kokille mit folgenden Parametern:
Bei einer gemäß Fig. 1 sinusförmig ausgebildeten vertikalen Kontur 4' des Eingießbereichs mit einer Amplitude von 1,52 mm beträgt die maximale lokale Änderung 1,90 %/m und die über die Bereiche a' und b' und die Trichterbreite gemittelte Längenänderung 0,50 %/m.With a sinusoidal vertical contour according to FIG. 1 4 'of the pouring area with an amplitude of 1.52 mm maximum local change 1.90% / m and that over the areas a 'and b 'and the funnel width averaged length change 0.50% / m.
Das gleiche Bild ergibt Fig. 3 a und Fig. 3 b für dieselbe Kokille herkömmlicher Bauart, bei der die vertikale Kokillenkontur der Breitseite durch eine gerade Linie ausgebildet ist. In diesem Fall ist die maximale lokale Längenänderung mit 2,44 %/m wesentlich größer. Es ist außerdem ersichtlich, daß die Verteilung der Formänderung wesentlich ungleichmäßiger und im Bereich der Kokillenoberkante, wo die Strangschalenbildung am empfindlichsten ist, besonders groß ist. Gerade diese Nachteile werden mit der Erfindung vermieden.3a and 3b show the same picture for the same mold conventional design, in which the vertical mold contour of the Broadside is formed by a straight line. In this case the maximum local change in length of 2.44% / m is essential greater. It can also be seen that the distribution of the shape change much more uneven and in the area of the upper edge of the mold, where strand shell formation is most sensitive is particularly large. It is precisely these disadvantages with the invention avoided.
Claims (12)
- Chill mould for the continuous casting of metal with a pouring region having cooled wide side walls and narrow side walls and narrowing in funnel shape in casting direction to the format of the cast strip, characterised in that in the gate region the inner contours of the wide side walls each have, in casting direction from above to below, at least two points with the characteristic that they define a straight line along which the inner contours of the wide side walls are formed with at least one concave and at least one convex section in any order.
- Chill mould according to claim 1, characterised in that in the gate region the inner contours (4) of the wide side walls are formed at least along a part length of a straight line, which is drawn from the chill mould upper edge (1) to the chill mould lower edge (3), in casting direction from above to below with at least one concave section (a) and one convex section (b) in any order.
- Chill mould according to claim 1, characterised in that in the gate region the inner contours (4' or 4") of the wide side walls are formed along a straight line, which connects the chill mould upper edge (1) and the start (2) of a lower vertical section (d' or d"), in casting direction from above to below with at least one concave section (a' or a") and with at least one convex section (b or b" and c") in any order.
- Chill mould according to one of claims 1, 2 and 3, characterised in that the concave sections (a, a', a") and convex sections (b, b', b") go over into one another directly or by an intermediate contour.
- Chill mould according to one of claims 1, 2, 3 and 4, characterised in that in the gate region the inner contours of the wide side walls are formed from above to below initially with a concave section (a, a', a") and consecutively thereto with a convex section (b, b', b" and c").
- Chill mould according to one of the preceding claims 1 to 5, characterised in that the inner contours of the wide side walls extend non-parallelly to one another.
- Chill mould according to at least one of the preceding claims 1 to 6, characterised in that the inner contours (4, 4', 4") of the wide side walls have a circularly arcuate path or a trigonometric, for example sinusoidal, path over one or more part regions (a, b, a', b, a", b", c").
- Chill mould according to at least one of the preceding claims 1 to 7, characterised in that the lower convex/concave section (b") of the wide side walls goes over with a constant course by an emergent arc (c") into the lower section (d") preferably with parallel walls.
- Chill mould according to at least one of the preceding claims 1 to 8, characterised in that each of the concave sections (a, a', a") and the concave sections (b, b', b", c") has not only a curvature constant in the course thereof, but also a variable curvature.
- Chill mould according to at least one of the preceding claims 1 to 9, characterised in that for the purpose of uniform distribution of the change in shape over the pouring-in region the maximum shape change is the same or substantially the same in all levels of the upper chill mould half.
- Chill mould according to at least one of the preceding claims 1 to 10, characterised in that the curvatures of the sections (a, b, a', b', a", b", c") are formed with such radii that the greatest local length change (Deltamax) at the transition from one level to a level disposed thereunder does not exceed the fourfold value of the local changes in length averaged over the gate region without consideration of the sections (d' and d") with parallel walls, in particular does not exceed the value of 2.0 %/m.
- Use of the chill mould with a gate geometry according to claims 1 to 11 for continuous casting of peritectic carbon steels and austenitic stainless steels with a tendency to comparatively extremely high shrinkage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742795A DE19742795A1 (en) | 1997-09-27 | 1997-09-27 | Funnel geometry of a mold for the continuous casting of metal |
| DE19742795 | 1997-09-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0904873A1 EP0904873A1 (en) | 1999-03-31 |
| EP0904873B1 true EP0904873B1 (en) | 2002-07-03 |
| EP0904873B2 EP0904873B2 (en) | 2011-10-26 |
Family
ID=7843886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98117587A Expired - Lifetime EP0904873B2 (en) | 1997-09-27 | 1998-09-16 | Gate geometry of a continuous casting mould for metal |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6186220B1 (en) |
| EP (1) | EP0904873B2 (en) |
| JP (1) | JP4289702B2 (en) |
| KR (1) | KR100594624B1 (en) |
| CN (1) | CN1106238C (en) |
| AT (1) | ATE219976T1 (en) |
| DE (2) | DE19742795A1 (en) |
| ES (1) | ES2183267T5 (en) |
| TW (1) | TW380064B (en) |
| ZA (1) | ZA988657B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100490985B1 (en) * | 2000-11-25 | 2005-05-24 | 주식회사 포스코 | Funnel Type Copper Plate For Continuous Casting Mold |
| WO2002064286A2 (en) * | 2001-02-09 | 2002-08-22 | Egon Evertz K.G. (Gmbh & Co) | Continuous casting ingot mould |
| DE10106328A1 (en) * | 2001-02-09 | 2002-08-14 | Evertz Egon Kg Gmbh & Co | Continuous casting mold for production of metal strip or thin plate has funnel-shaped casting slot enclosed between two plates and having elliptical cross-section |
| AT410766B (en) * | 2001-09-28 | 2003-07-25 | Voest Alpine Ind Anlagen | ended mold |
| US6975877B1 (en) | 2001-10-17 | 2005-12-13 | Cisco Technology, Inc. | System and method for synchronizing clock dividers in a wireless network |
| KR100940679B1 (en) * | 2002-12-27 | 2010-02-08 | 주식회사 포스코 | A funnel mold for thin slab continuous casting |
| CN1292858C (en) * | 2004-01-17 | 2007-01-03 | 宝山钢铁股份有限公司 | Water-cooled metal continuous-casting crystallizer |
| JP5018274B2 (en) * | 2007-06-28 | 2012-09-05 | 住友金属工業株式会社 | Mold for continuous casting of round billet slab and continuous casting method |
| SG2012079117A (en) | 2012-10-24 | 2014-05-29 | Pratt & Whitney Services Pte Ltd | Casting funnel |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH617608A5 (en) * | 1977-04-06 | 1980-06-13 | Concast Ag | |
| FR2583662B1 (en) * | 1985-06-25 | 1987-09-25 | Clecim Sa | METHOD AND MACHINE FOR CONTINUOUS CASTING OF A THIN METAL PRODUCT |
| DE3640525C2 (en) * | 1986-11-27 | 1996-02-15 | Schloemann Siemag Ag | Mold for the continuous casting of steel strip |
| JPH02207945A (en) * | 1989-02-08 | 1990-08-17 | Sumitomo Metal Ind Ltd | Mold for continuous casting of round cast billet |
| DE3907351C2 (en) | 1989-03-08 | 1998-09-24 | Schloemann Siemag Ag | Pouring funnel of a mold |
| FR2645463B1 (en) * | 1989-04-06 | 1991-05-31 | Techmetal Promotion | PROCESS AND INSTALLATION FOR CASTING THIN METAL PRODUCTS |
| JPH02284747A (en) * | 1989-04-24 | 1990-11-22 | Sumitomo Metal Ind Ltd | Mold for continuous casting |
| JPH04172153A (en) * | 1990-11-06 | 1992-06-19 | Kawatetsu Techno Res Corp | Method and apparatus for continuous casting |
| DE4201363C2 (en) | 1992-01-20 | 2000-08-10 | Sms Demag Ag | Mold for the continuous casting of steel strip |
| JP2972051B2 (en) * | 1993-04-15 | 1999-11-08 | 住友重機械工業株式会社 | Steel continuous casting mold and continuous casting method |
| IT1267243B1 (en) * | 1994-05-30 | 1997-01-28 | Danieli Off Mecc | CONTINUOUS CASTING PROCEDURE FOR PERITECTIC STEELS |
| IT1267244B1 (en) * | 1994-05-30 | 1997-01-28 | Danieli Off Mecc | CONTINUOUS CASTING PROCESS FOR STEELS WITH A HIGH CARBON CONTENT |
| DE19710791C2 (en) † | 1997-03-17 | 2000-01-20 | Schloemann Siemag Ag | Optimized forms of the continuous casting mold and the immersion nozzle for casting steel slabs |
| US5927378A (en) * | 1997-03-19 | 1999-07-27 | Ag Industries, Inc. | Continuous casting mold and method |
| DE19728957A1 (en) † | 1997-06-30 | 1999-01-07 | Mannesmann Ag | Method and device for producing thin slabs |
-
1997
- 1997-09-27 DE DE19742795A patent/DE19742795A1/en not_active Withdrawn
-
1998
- 1998-09-16 AT AT98117587T patent/ATE219976T1/en active
- 1998-09-16 ES ES98117587T patent/ES2183267T5/en not_active Expired - Lifetime
- 1998-09-16 EP EP98117587A patent/EP0904873B2/en not_active Expired - Lifetime
- 1998-09-16 DE DE59804640T patent/DE59804640D1/en not_active Expired - Lifetime
- 1998-09-17 US US09/154,908 patent/US6186220B1/en not_active Expired - Lifetime
- 1998-09-22 ZA ZA989657A patent/ZA988657B/en unknown
- 1998-09-25 JP JP27174698A patent/JP4289702B2/en not_active Expired - Fee Related
- 1998-09-26 KR KR1019980040129A patent/KR100594624B1/en not_active IP Right Cessation
- 1998-09-26 CN CN98125062A patent/CN1106238C/en not_active Expired - Fee Related
- 1998-12-03 TW TW087120047A patent/TW380064B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ZA988657B (en) | 1999-06-04 |
| DE19742795A1 (en) | 1999-04-01 |
| TW380064B (en) | 2000-01-21 |
| ATE219976T1 (en) | 2002-07-15 |
| ES2183267T5 (en) | 2012-01-24 |
| US6186220B1 (en) | 2001-02-13 |
| CN1106238C (en) | 2003-04-23 |
| KR19990030178A (en) | 1999-04-26 |
| EP0904873A1 (en) | 1999-03-31 |
| CN1220195A (en) | 1999-06-23 |
| KR100594624B1 (en) | 2006-08-30 |
| JP4289702B2 (en) | 2009-07-01 |
| JPH11156488A (en) | 1999-06-15 |
| DE59804640D1 (en) | 2002-08-08 |
| ES2183267T3 (en) | 2003-03-16 |
| EP0904873B2 (en) | 2011-10-26 |
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