EP0920936B1 - Mould for continuous casting - Google Patents
Mould for continuous casting Download PDFInfo
- Publication number
- EP0920936B1 EP0920936B1 EP98122281A EP98122281A EP0920936B1 EP 0920936 B1 EP0920936 B1 EP 0920936B1 EP 98122281 A EP98122281 A EP 98122281A EP 98122281 A EP98122281 A EP 98122281A EP 0920936 B1 EP0920936 B1 EP 0920936B1
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- EP
- European Patent Office
- Prior art keywords
- funnel
- chill mould
- mold
- region
- casting
- 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
- 238000009749 continuous casting Methods 0.000 title claims description 13
- 238000005266 casting Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 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 funnel geometry of a mold for the continuous casting of Metal with a cooled broadside and narrow side walls, funnel-shaped in the casting direction to the format of the cast strand Pouring.
- 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 determines its immersion depth in the melt.
- the strand shell Due to the funnel-shaped shape of the broad side walls takes place in the casting direction not only a rejuvenation, but also a change in shape of the Strand cross section instead.
- the strand shell is in transit a funnel mold in contrast to a conventional continuous casting mold with flat walls forced additional deformations, which too Errors.
- the strand shell becomes there additional deformations imposed. Besides, in this case there is none more even contact between the strand shell and the mold wall is guaranteed. Areas arise with excessively high and low strand shell temperatures, which increases the likelihood of errors.
- the strand shell lifts partially from the mold wall from. The strong rewarming in these areas creates high levels thermal stresses that lead to errors.
- EP 0 268 910 proposes the broad side walls in one in the pouring area to let the first section run essentially parallel to one another and in a subsequent section due to the thickness of the casting format, the first section being below the one to be set in the casting operation Casting level in the area of the first strand shell formation enough. In this way, the strand shell, which is still thin below the casting level, be guided without deformation.
- EP 0 552 501 discloses a mold for the continuous casting of steel strip, in which the broad side walls form a funnel-shaped pouring area that leads to the Narrow side walls and in the casting direction to the format of the cast tape is reduced.
- the funnel-shaped pouring area is through lateral arcs and determined at the tangent points with these connected arcs.
- To reduce friction and wear and to reduce tensile and bending loads of the strand shell are the radii of the lateral arcs in a section extending at least 100 mm from the upper edge of the mold consistently trained.
- DE 39 07 351 A1 discloses a proposal, the contour of the inner wall the pouring funnel of a mold through three tangentially touching arcs to form, 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. In this way the deformation of the metal casting strand over the greatest possible length distributed, and constrictions and cracks in the strand shell of the metal casting are avoided. An even distribution of the Shape change of the strand shell in a pouring area shaped in this way thereby achieved that their radii in the strand passage direction with the same or unequal factor increase.
- Document WO 94/07628 discloses a mold with curved broad side inner walls, which has an upper convex and between the inlet and outlet ends have a lower parallel-walled area.
- the mold for the production of a cast strand includes two spaced metal plates between terminal ones Walls to which they are connected. Each metal plate has an opening width and a depth dimension between the inlet and outlet ends the mold and is designed so that the dimension (t) of the mold passage across the width of the same evenly and less than the corresponding Dimension at the inlet end of the mold.
- each end wall between the inlet and outlet ends is composed from two areas.
- the first area extends from the outlet end to an intermediate position and has assigned coolant, whereas the second Area extends to the inlet end and is equipped with heating means, whereby in the Operation in contact with the first area stimulates the solidification of the casting metal, and is braked in contact with the second area.
- the object of the invention based on specifying a further funnel geometry of a mold, through which Friction and wear between the strand shell and mold walls are even better reduced and especially in the formation of strand shells one too comparative high shrinking steel an even clearer reduction the failure of the slab surface due to the shrinking behavior of the Stahl's adapted tapering of the mold cross-section is realized.
- the invention is based on the knowledge that for a given horizontal Contour of the funnel area the course of the tapering of the mold cross-section in the casting direction by the design of the vertical contour can.
- the problem is solved with the invention in a mold of the type mentioned in the preamble of claim 1 in that the funnel geometry of the broad side inner walls in the area between a mold upper edge (1) and a corresponding mold exit edge (3) with a convex Contour is formed which has a larger taper in the upper mold area and a smaller taper in the lower mold area.
- the lower section of the mold has a parallel-walled area, is a particularly smooth transition between the funnel area and subsequent parallel walled area in that the convex Contour with a terminal lower circular arc in the rectilinear area passes with a steady course.
- the four different funnel contours of the broad side wall shown in FIG. 1 a mold have a funnel shape in the casting direction to the format of the cast strand tapered pouring area A or a funnel-shaped in Pouring direction tapered pouring area B to the format of the cast strand and a subsequent, essentially parallel-walled area C.
- This The mold area or the mold outlet do not have to have parallel exit surfaces or have trailing edges.
- the lower mold area or the lower mold outlet can have a small curvature of 1 to 15 mm in the middle area have per broad side wall.
- the funnel contours of the broad side walls 4 are along the a straight line connecting the upper mold edge 1 and the lower mold edge 3 convex.
- the funnel cones of the broad side walls are 4 'or 4 "or 4 '' 'between the upper edge of the mold 1 and the start of a parallel-walled area 2 convex. It can be seen that the inner contours of the Broad sidewalls over the sections a ', a "and a"' each have an arcuate shape, have a sinusoidal and a polinomial course.
- Fig. 1 also shows that the convex sections a ', a “and a” "with a continuous Merge the course into the respective parallel-walled areas b ', b “and b” ".
- FIG. 2 shows the tapering of the mold cross section in the casting direction of a continuous casting mold with the following parameters for the vertical inner contours shown in FIG. 1: 950 mm funnel width, 45 mm funnel depth at the upper edge of the mold plate, 900 mm funnel length, sinusoidal horizontal contour.
- Fig. 1 to 3 point to the essential feature of the invention that unchangeable Pouring area parameters the introduction of a convex vertical Inner contour of the pouring area for a larger taper in the upper Mold area and a smaller taper in the lower mold area leads.
- the invention provides, among other things, a use of the claimed Mold for the continuous casting of comparatively high shrinkage tending peritectic carbon steels and austenitic stainless Steel before.
- FIG. 6 shows different vertical convex funnel contours for a continuous casting coke with the parameters already mentioned above.
- this Funnel contours lie in the shrinkage profiles specified in FIG. 4 or the corresponding length changes shown in FIG. 5.
- Each of the specified shrinkage profiles corresponds to a specific one Combination of steel properties and casting parameters and can by theoretical Considerations and practical experience can be determined.
Abstract
Description
Die Erfindung betrifft eine Trichtergeometrie einer 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 funnel geometry of a mold for the continuous casting of Metal with a cooled broadside and narrow side walls, funnel-shaped in the casting direction to the format of the cast strand Pouring.
Die Abmessungen des Eingießbereiches 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 determines its immersion depth in the melt.
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, welche zu Fehlern führen können. Due to the funnel-shaped shape of the broad side walls takes place in the casting direction not only a rejuvenation, but also a change in shape of the Strand cross section instead. As a result, the strand shell is in transit a funnel mold in contrast to a conventional continuous casting mold with flat walls forced additional deformations, which too Errors.
Es ist bekannt, daß es durch die Ausgestaltung der horizontalen oder vertikalen Kontur des trichterförmigen Eingießbereiches einer Stranggießkokille möglich ist, die dem Strang auferlegten Verformungen günstiger zu verteilen, um somit der Entstehung von Fehlern des Gußproduktes entgegenzuwirken.It is known that by the design of the horizontal or vertical Contour of the funnel-shaped pouring area of a continuous casting mold is possible, to distribute the deformations imposed on the strand more favorably so that the Counteract the occurrence of defects in the cast product.
Im Gegensatz zu einer herkömmlichen Kokille mit ebenen Wänden, wo der Schrumpf des Stranges durch die Neigung der Schmalseiten ausgeglichen wird, ist der Verlauf der Verjüngung des Kokillenquerschnitts in Gießrichtung in einer Stranggießkokille mit trichterförmigen Eingießbereich von großer Bedeutung.In contrast to a conventional mold with flat walls, where the Shrinkage of the strand is compensated for by the inclination of the narrow sides, is the course of the tapering of the mold cross-section in the casting direction in one Continuous casting mold with funnel-shaped pouring area of great importance.
Ist in einem oder mehreren Höhenabschnitten die Verjüngung des Kokillenquerschnitts größer als der Schrumpf des Stranges, so werden dort der Strangschale zusätzliche Verformungen aufgezwungen. Außerdem ist in diesem Fall kein gleichmäßiger Kontakt zwischen Strangschale und Kokillenwand mehr gewährleistet. Es entstehen Bereiche mit übermäßig hoher und tiefer Strangschalentemperatur, was die Wahrscheinlichkeit der Entstehung von Fehlern erhöht.Is the taper of the mold cross-section at one or more height sections larger than the shrinkage of the strand, the strand shell becomes there additional deformations imposed. Besides, in this case there is none more even contact between the strand shell and the mold wall is guaranteed. Areas arise with excessively high and low strand shell temperatures, which increases the likelihood of errors.
Ist die Verjüngung zu klein, so hebt die Strangschale teilweise von der Kokillenwand ab. Durch die starke Wiedererwärmung in diesen Bereichen entstehen hohe thermische Spannungen, die zu Fehlern führen.If the taper is too small, the strand shell lifts partially from the mold wall from. The strong rewarming in these areas creates high levels thermal stresses that lead to errors.
Bei den Fehlern handelt es sich um Risse, Einschnürungen und Gefügestörungen. Diese Fehler sind um gravierender, je stärker ein Stahl zu vergleichsweise hoher Schrumpfung im Verlauf der Erstarrung und Abkühlung der sich bildenden Strangschale neigt.The defects are cracks, constrictions and structural disorders. These errors are all the more serious the stronger a steel is, the comparatively higher Shrinkage in the course of solidification and cooling of the strand shell that forms inclines.
Die EP 0 268 910 schlägt vor, die Breitseitenwände im Eingießbereich in einem
ersten Abschnitt im wesentlichen parallel zueinander verlaufen zu lassen und in
einem sich daran anschließenden Abschnitt auf die Dicke des Gießformates zurückzuführen,
wobei der erste Abschnitt bis unterhalb der beim Gießbetrieb einzustellenden
Gießspiegelebene in den Bereich der ersten Strangschalenbildung
reicht. Auf diese Weise soll die unterhalb des Gießspiegels noch dünne Strangschale
verformungsfrei geführt werden.
Die EP 0 552 501 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. Der trichterförmige Eingießbereich 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.
Die DE 39 07 351 A1 offenbart einen Vorschlag, die Kontur der Innenwandung des Eingießtrichters einer Kokille durch drei sich tangential berührende Kreisbögen zu bilden, deren Radien, in Strangdurchlaufrichtung allmählich größer werdend, in die Kontur der Innenwandung der Kokille übergehen. Auf diese Weise wird die Verformung des Metallgießstranges auf eine größtmögliche Streckenlänge verteilt, und Einschnürungen sowie Rißbildungen in der Strangschale des Metallgießstranges werden vermieden. 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 contour of the inner wall the pouring funnel of a mold through three tangentially touching arcs to form, 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. In this way the deformation of the metal casting strand over the greatest possible length distributed, and constrictions and cracks in the strand shell of the metal casting are avoided. An even distribution of the Shape change of the strand shell in a pouring area shaped in this way thereby achieved that their radii in the strand passage direction with the same or unequal factor increase.
Das Dokument WO 94/07628 offenbart eine Kokille mit gekrümmten Breitseiten-Innenwänden, die zwischen Einlauf- und Auslaufende einen oberen konvexen und einen unteren parallelwandigen Bereich aufweisen. Die Kokille zur Produktion von einem Gusstrang umfasst zwei beabstandete Metallplatten zwischen endständigen Wänden, mit welchen sie verbunden sind. Jede Metallplatte hat eine Durchlassbreite und eine Tiefendimension zwischen dem Einlass- und dem Auslassende der Kokille und ist so gestaltet, dass die Abmessung (t) des Gießform-Durchlasses quer zur Breite desselben gleichmäßig und geringer als die entsprechende Dimension beim Einlassende der Kokille ist.Document WO 94/07628 discloses a mold with curved broad side inner walls, which has an upper convex and between the inlet and outlet ends have a lower parallel-walled area. The mold for the production of a cast strand includes two spaced metal plates between terminal ones Walls to which they are connected. Each metal plate has an opening width and a depth dimension between the inlet and outlet ends the mold and is designed so that the dimension (t) of the mold passage across the width of the same evenly and less than the corresponding Dimension at the inlet end of the mold.
Das Tiefenmaß jeder Endwand zwischen Einlass- und Auslassende setzt sich zusammen aus zwei Bereichen. Der erste Bereich reicht vom Auslassende bis zu einer Zwischenposition und weist zugeordnete Kühlmittel auf, wogegen der zweite Bereich bis zum Einlaufende reicht und mit Heizmitteln ausgestattet ist, wobei im Betrieb beim Kontakt mit dem ersten Bereich die Erstarrung des Gießmetalls angeregt, und im Kontakt mit dem zweiten Bereich gebremst wird.The depth dimension of each end wall between the inlet and outlet ends is composed from two areas. The first area extends from the outlet end to an intermediate position and has assigned coolant, whereas the second Area extends to the inlet end and is equipped with heating means, whereby in the Operation in contact with the first area stimulates the solidification of the casting metal, and is braked in contact with the second area.
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 durch eine dem Schrumpfverhalten des Stahles angepaßte Verjüngung des Kokillenquerschnitts verwirklicht wird.Starting from the aforementioned prior art, the object of the invention based on specifying a further funnel geometry of a mold, through which Friction and wear between the strand shell and mold walls are even better reduced and especially in the formation of strand shells one too comparative high shrinking steel an even clearer reduction the failure of the slab surface due to the shrinking behavior of the Stahl's adapted tapering of the mold cross-section is realized.
Der Erfindung liegt die Erkenntnis zugrunde, dass bei vorgegebener horizontaler Kontur des Trichterbereiches der Verlauf der Verjüngung des Kokillenquerschnitts in Giessrichtung durch die Ausgestaltung der vertikalen Kontur vorgegeben werden kann.The invention is based on the knowledge that for a given horizontal Contour of the funnel area the course of the tapering of the mold cross-section in the casting direction by the design of the vertical contour can.
Die Lösung der Aufgabe gelingt mit der Erfindung bei einer Kokille der im Oberbegriff
von Anspruch 1 genannten Art dadurch,
dass die Trichtergeometrie der Breitseiten-Innenwandungen im Bereich zwischen
einer Kokillen-Oberkante (1) und einer entsprechenden Kokillen-Austrittskante (3)
mit einer konvexen Kontur ausgebildet ist,
die im oberen Kokillenbereich eine größere Verjüngung, und im unteren Kokillenbereich
eine geringere Verjüngung aufweist.The problem is solved with the invention in a mold of the type mentioned in the preamble of
which has a larger taper in the upper mold area and a smaller taper in the lower mold area.
Durch die erfindungsgemäße Trichtergeometrie der Kokille wird die Reibung und damit der Verschleiß zwischen Strangschale und den entsprechenden Kokillenwänden signifikant verringert und insbesondere beim Gießen einer zu hoher Schrumpfung neigenden Stahlqualität eine deutliche Verringerung des Fehlerbefalls der Brammenoberfläche infolge der angepassten Verjüngungen des Kokillenquerschitts erreicht.Through the funnel geometry of the mold according to the invention, the friction and thus the wear between the strand shell and the corresponding mold walls significantly reduced and especially when casting a too high one Shrinkage-prone steel quality significantly reduces the number of defects the slab surface due to the adapted tapering of the mold cross-section reached.
Weitere verbesserte Anpassungsverhältnisse zwischen Strangschale und Kokillenwänden ergeben sich aus den Unteransprüchen mit weiteren Gestaltungsmerkmalen der Trichtergeometrie, insbesondere aufgrund von akuten Betriebserfahrungen bezüglich des Schrumpfverhaltens diverser Stähle sowie entsprechender Gießparameter.Further improved adaptation relationships between the strand shell and the mold walls result from the subclaims with further design features the funnel geometry, especially due to acute operating experience with regard to the shrinking behavior of various steels and corresponding ones Casting parameters.
Kennzeichnend hierfür ist im Sinne der Erfindung weiterhin, dass unabhängig von der horizontalen Kontur des Eingießbereiches die Verjüngung des Kokillenquerschnitts in Gießrichtung in weiten Grenzen variabel einstellbar und demzufolge optimal an den Schrumpfverlauf anpassbar ist, welcher nicht nur von den Eigenschaften des zu vergießenden Stahles abhängt, sondern auch von übrigen Parametern wie z. B. von der Gießgeschwindigkeit und den Kühlbedingungen.It is also characteristic of this in the sense of the invention that independent of the horizontal contour of the pouring area the taper of the mold cross-section variably adjustable in the casting direction within wide limits and consequently is optimally adaptable to the shrinkage course, which is not only of the properties depends on the steel to be cast, but also on other parameters such as B. from the casting speed and the cooling conditions.
Wenn der untere Abschnitt der Kokille einen parallelwandigen Bereich aufweist, wird damit ein besonders reibungsfreier Übergang zwischen Trichterbereich und anschließendem parallelwandigen Bereich dadurch erreicht, dass die konvexe Kontur 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, is a particularly smooth transition between the funnel area and subsequent parallel walled area in that the convex Contour with a terminal lower circular arc in the rectilinear area passes with a steady course.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus den nachstehenden Erläuterungen der Figurenbeschreibungen.Further details, features and advantages of the invention result from the following explanations of the figure descriptions.
Es zeigen:
Figur 1- im Schnitt entlang der Mittelachse vier verschiedene
trichterförmige Innenkonturen Figur 2- die über die Kokillenlänge aufgetragene Längendifferenz von horizontaler
Trichterkontur und entsprechender horizontaler parallelwandiger
Kontur für die in Fig. 2 aufgeführten Innenkonturen der
Breitseitenwand einer Kokille nach der Erfindung und für die beiden
geradlinigen Innenkonturen 5 und 6, Figur 3- die Verjüngung des Kokillenquerschnitts in Gießrichtung für die in
Fig. 1 aufgeführten Innenkonturen der Breitseitenwand einer Kokille
nach der Erfindung und für die beiden
geradlinigen Innenkonturen 5 und 6, Figur 4- fünf verschiedene Verläufe der Verjüngung des Kokillenquerschnitts in Gießrichtung einer Stranggießkokille mit trichterförmigem Eingießbereich,
Figur 5- die über die Kokillenlänge aufgetragene Längendifferenz von horizontaler Trichterkontur und entsprechender horizontaler parallelwandiger Kontur für die in Fig. 4 aufgeführten Verläufe der Verjüngung des Kokillenquerschnitts in Gießrichtung einer Stranggießkokille mit trichterförmigem Eingießbereich,
Figur 6- im Schnitt entlang der Mittelachse die konvexen trichterförmigen Innenkonturen für die in Fig. 4 vorgegebenen Verläufe der Verjüngungsgeschwindigkeit des Kokillenquerschnitts in Gießrichtung einer Stranggießkokille mit trichterförmigem Eingießbereich.
- Figure 1
- in section along the central axis four different funnel-shaped
inner contours - Figure 2
- the length difference plotted over the mold length of the horizontal funnel contour and the corresponding horizontal parallel-walled contour for the inner contours of the broad side wall of a mold according to the invention shown in FIG. 2 and for the two straight
inner contours - Figure 3
- the tapering of the mold cross section in the casting direction for the inner contours of the broad side wall of a mold according to the invention shown in FIG. 1 and for the two straight
inner contours - Figure 4
- five different courses of the tapering of the mold cross-section in the casting direction of a continuous casting mold with a funnel-shaped pouring area,
- Figure 5
- the length difference plotted over the mold length of the horizontal funnel contour and the corresponding horizontal parallel-walled contour for the courses of the tapering of the mold cross section in the pouring direction of a continuous casting mold with a funnel-shaped pouring area shown in FIG. 4,
- Figure 6
- in section along the central axis the convex funnel-shaped inner contours for the curves of the tapering speed of the mold cross-section given in FIG. 4 in the casting direction of a continuous casting mold with a funnel-shaped pouring area.
Die in Fig. 1 dargestellten vier 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 four different funnel contours of the broad side wall shown in FIG. 1 a mold have a funnel shape in the casting direction to the format of the cast strand tapered pouring area A or a funnel-shaped in Pouring direction tapered pouring area B to the format of the cast strand and a subsequent, essentially parallel-walled area C. This The mold area or the mold outlet do not have to have parallel exit surfaces or have trailing edges. The lower mold area or the lower mold outlet can have a small curvature of 1 to 15 mm in the middle area have per broad side wall.
Im Trichterbereich A sind die Trichterkonturen der Breitseitenwände 4 entlang der
einer die Kokillenoberkante 1 und die Kokillenunterkante 3 verbindenden Geraden
konvex ausgebildet.In the funnel area A, the funnel contours of the
Im Trichterbereich B sind die Trichterkonuren der Breitseitenwände 4' bzw. 4" oder
4''' zwischen der Kokillenoberkante 1 und dem Beginn eines parallelwandigen Bereiches
2 konvex ausgebildet. Dabei ist ersichtlich, daß die Innenkonturen der
Breitseitenwände über die Abschnitte a', a" und a"' jeweils einen kreisbogenförmigen,
einen sinusförmigen und einen polinomen Verlauf aufweisen. In the funnel area B, the funnel cones of the broad side walls are 4 'or 4 "or
4 '' 'between the upper edge of the
Fig. 1 zeigt außerdem, daß die konvexen Abschnitte a', a" und a''' mit einem stetigen Verlauf in die jeweiligen parallelwandigen Bereiche b', b" und b''' übergehen.Fig. 1 also shows that the convex sections a ', a "and a" "with a continuous Merge the course into the respective parallel-walled areas b ', b "and b" ".
Erfindungswesentlich für die Trichtergeometrie ist die Maßnahme, daß jeder konvexe Abschnitt A, a', a" und a"' sowohl eine in dessen Verlauf gleichbleibende als auch eine veränderliche Krümmung aufweisen kann.Essential to the invention for the funnel geometry is the measure that each convex Section A, a ', a "and a"' are both constant in their course as can also have a variable curvature.
Fig. 2 zeigt für die in Fig. 1 dargestellten vertikalen Innenkonturen die Verjüngung
des Kokillenquerschnitts in Gießrichtung einer Stranggießkokille mit folgenden
Parametern:
950 mm Trichterbreite, 45 mm Trichtertiefe an der Oberkante der Kokillenplatte,
900 mm Trichterlänge, sinusförmige horizontale Kontur.2 shows the tapering of the mold cross section in the casting direction of a continuous casting mold with the following parameters for the vertical inner contours shown in FIG. 1:
950 mm funnel width, 45 mm funnel depth at the upper edge of the mold plate, 900 mm funnel length, sinusoidal horizontal contour.
Auf Fig. 2 und Fig. 3 sind die Auswirkungen unterschiedlicher konvexer vertikaler Innenkonturen des Trichterbereiches und Längendifferenz und Verjüngung des Kokillenquerschnittes zu sehen.In Fig. 2 and Fig. 3, the effects of different convex verticals Inner contours of the funnel area and length difference and tapering of the To see mold cross section.
Fig. 1 bis 3 weisen auf das erfindungswesentliche Merkmal hin, daß bei unveränderlichen Parametern des Eingießbereiches die Einführung einer konvexen vertikalen Innenkontur des Eingießbereiches zu einer größeren Verjüngung im oberen Kokillenbereich und einer geringeren Verjüngung im unteren Kokillenbereich führt.Fig. 1 to 3 point to the essential feature of the invention that unchangeable Pouring area parameters the introduction of a convex vertical Inner contour of the pouring area for a larger taper in the upper Mold area and a smaller taper in the lower mold area leads.
Deshalb sieht die Erfindung unter anderem eine Verwendung der beanspruchten Kokille für das Stranggießen von vergleichsweise zu extrem hoher Schrumpfung neigenden peritektischen Kohlenstoffstählen und austenitischen nichtrostenden Stählen vor. Therefore, the invention provides, among other things, a use of the claimed Mold for the continuous casting of comparatively high shrinkage tending peritectic carbon steels and austenitic stainless Steel before.
Als Ausführungsbeispiel zeigt Fig. 6 verschiedene vertikale konvexe Trichterkonturen für eine Stranggießkokkile mit den bereits oben genannten Parametern. Diesen Trichterkonturen liegen die in Fig. 4 vorgegebenen Schrumpfungsverläufe bzw. die in Fig. 5 dargestellten entsprechenden Längenänderungen zugrunde. Jeder der vorgegebenen Schrumpfungsverläufe entspricht einer bestimmten Kombination von Stahleigenschaften und Gießparametern und kann durch theoretische Betrachtungen und praktische Erfahrungen ermittelt werden.As an exemplary embodiment, FIG. 6 shows different vertical convex funnel contours for a continuous casting coke with the parameters already mentioned above. this Funnel contours lie in the shrinkage profiles specified in FIG. 4 or the corresponding length changes shown in FIG. 5. Each of the specified shrinkage profiles corresponds to a specific one Combination of steel properties and casting parameters and can by theoretical Considerations and practical experience can be determined.
Die in Fig. 1 bis Fig. 6 dargestellten Zusammenhänge verdeutlichen, daß unabhängig von der horizontalen Kontur des Eingießbereiches die Verjüngung des Kokillenquerschnitts in Gießrichtung in weiten Grenzen variabel einstellbar ist und demzufolge an den Schrumpfverlauf des Stranges angepaßt werden kann, welcher im allgemeinen nicht nur von den Eigenschaften des zu vergießenden Stahles abhängt, sondern auch von anderen Gießparametern, wie z. B. der Gießgeschwindigkeit.The relationships shown in Fig. 1 to Fig. 6 illustrate that independent the taper of the mold cross-section from the horizontal contour of the pouring area is variably adjustable in the casting direction within wide limits and consequently can be adapted to the shrinkage of the strand, which generally not just on the properties of the steel to be cast depends, but also on other casting parameters, such as. B. the casting speed.
Claims (7)
- Chill mould for continuous casting of metal, with a pouring-in region having a coolable wide side wall and narrow side walls and narrowing in funnel-shape in pouring direction to the format of the cast strip, characterised in that the funnel geometry of the wide side inner walls is formed in the region between a chill mould upper edge (1) and a corresponding chill mould exit edge (3) with a convex contour which has a greater degree of narrowing in the upper chill mould region and a lesser degree of narrowing in the lower chill mould region.
- Chill mould according to claim 1, characterised in that the funnel geometry can have, for each convex portion A, a', a", a''', not only a curvature which remains the same in the course thereof, but also a variable curvature.
- Chill mould according to claim 2, characterised in that the convex inner contour of the wide side walls has a circularly arcuate, polygonal or trigonometric course.
- Chill mould according to one or more of claims 1 to 3, characterised in that in the funnel region B the funnel contours of the wide side walls 4', 4" or 4"' between the chill mould upper edge (1) and the beginning of a region (2) with parallel walls are formed to be convex and merge by way of sections a', a" and a"' into the respective regions b', b", b''' with parallel walls in each instance by way of a circularly arcuate, sinusoidal or polynomial course.
- Chill mould according to one or more of claims 1 to 4, characterised in that the funnel contours are based on predeterminable shrinkage courses or corresponding length changes and that a combination of steel characteristics and casting parameters, which are ascertained by theoretical consideration and practical experiences, correspond with each of the predetermined shrinkage courses.
- Chill mould according to claim 5, characterised in that independently of the horizontal contour of the pouring-in region the narrowing of the chill mould cross-section in pouring direction is variably settable within wide limits and consequently can be matched to the shrinkage course of the strip, which depends not only on the characteristics of the steel to be cast, but also on other casting parameters such as, for example, casting speed.
- Chill mould according to one or more of claims 1 to 6, characterised in that the convex inner contour of the wide side walls merges into the lower section b', b", b"' with parallel walls by a terminating curve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19753537 | 1997-12-03 | ||
| DE19753537A DE19753537A1 (en) | 1997-12-03 | 1997-12-03 | Funnel geometry of a mold for the continuous casting of metal |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0920936A2 EP0920936A2 (en) | 1999-06-09 |
| EP0920936A3 EP0920936A3 (en) | 2000-04-26 |
| EP0920936B1 true EP0920936B1 (en) | 2003-06-18 |
Family
ID=7850553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98122281A Expired - Lifetime EP0920936B1 (en) | 1997-12-03 | 1998-11-24 | Mould for continuous casting |
Country Status (12)
| Country | Link |
|---|---|
| US (2) | US6390176B1 (en) |
| EP (1) | EP0920936B1 (en) |
| JP (1) | JPH11244996A (en) |
| KR (1) | KR100633030B1 (en) |
| CN (1) | CN1187144C (en) |
| AT (1) | ATE243082T1 (en) |
| CA (1) | CA2255279C (en) |
| DE (2) | DE19753537A1 (en) |
| ES (1) | ES2205367T3 (en) |
| MY (1) | MY131906A (en) |
| TW (1) | TW380065B (en) |
| ZA (1) | ZA9810910B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10009073A1 (en) * | 1999-11-10 | 2001-05-17 | Sms Demag Ag | Mold has a funnel-shaped casting region having cooled wide side walls and narrow side walls with the region tapering in the casting direction to format the casting strand |
| AT410766B (en) * | 2001-09-28 | 2003-07-25 | Voest Alpine Ind Anlagen | ended mold |
| KR100910459B1 (en) * | 2002-06-05 | 2009-08-04 | 주식회사 포스코 | Mold for Continuous Casting Steel |
| CN1292858C (en) * | 2004-01-17 | 2007-01-03 | 宝山钢铁股份有限公司 | Water-cooled metal continuous-casting crystallizer |
| CN105705408A (en) * | 2013-11-06 | 2016-06-22 | 雅马哈发动机株式会社 | Saddle-type electric vehicle |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH617608A5 (en) * | 1977-04-06 | 1980-06-13 | Concast Ag | |
| JPS617046A (en) * | 1984-01-26 | 1986-01-13 | Kawasaki Steel Corp | Casting mold for continuous casting of thin-walled billet |
| 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 |
| JPH0360848A (en) * | 1989-07-31 | 1991-03-15 | Nippon Steel Corp | Production of 18-8 series austenite stainless steel strip |
| DE4201363C2 (en) * | 1992-01-20 | 2000-08-10 | Sms Demag Ag | Mold for the continuous casting of steel strip |
| GB9221006D0 (en) * | 1992-10-06 | 1992-11-18 | Davy Distington Ltd | Continuous casting mould |
| JP3063518B2 (en) * | 1993-12-27 | 2000-07-12 | 株式会社日立製作所 | Continuous casting device and continuous casting system |
| DE4403045C1 (en) * | 1994-01-28 | 1995-09-07 | Mannesmann Ag | Continuous caster for guiding strands |
| JP3122352B2 (en) * | 1995-10-12 | 2001-01-09 | 三菱重工業株式会社 | Mold for continuous casting equipment |
| JPH09192785A (en) * | 1996-01-11 | 1997-07-29 | Hitachi Ltd | Continuous casting apparatus |
| JPH08309492A (en) * | 1996-06-05 | 1996-11-26 | Hitachi Ltd | Continuous casting machine for sheet |
-
1997
- 1997-12-03 DE DE19753537A patent/DE19753537A1/en not_active Withdrawn
-
1998
- 1998-11-24 AT AT98122281T patent/ATE243082T1/en active
- 1998-11-24 EP EP98122281A patent/EP0920936B1/en not_active Expired - Lifetime
- 1998-11-24 ES ES98122281T patent/ES2205367T3/en not_active Expired - Lifetime
- 1998-11-24 DE DE59808750T patent/DE59808750D1/en not_active Expired - Lifetime
- 1998-11-25 US US09/199,734 patent/US6390176B1/en not_active Expired - Lifetime
- 1998-11-30 ZA ZA9810910A patent/ZA9810910B/en unknown
- 1998-12-02 MY MYPI98005449A patent/MY131906A/en unknown
- 1998-12-02 JP JP10343435A patent/JPH11244996A/en active Pending
- 1998-12-03 KR KR1019980052853A patent/KR100633030B1/en not_active IP Right Cessation
- 1998-12-03 CA CA002255279A patent/CA2255279C/en not_active Expired - Fee Related
- 1998-12-03 CN CNB981269141A patent/CN1187144C/en not_active Expired - Fee Related
- 1998-12-08 TW TW087120303A patent/TW380065B/en not_active IP Right Cessation
-
2001
- 2001-08-24 US US09/938,914 patent/US20020000305A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN1187144C (en) | 2005-02-02 |
| ATE243082T1 (en) | 2003-07-15 |
| ES2205367T3 (en) | 2004-05-01 |
| JPH11244996A (en) | 1999-09-14 |
| KR19990062772A (en) | 1999-07-26 |
| TW380065B (en) | 2000-01-21 |
| US20020000305A1 (en) | 2002-01-03 |
| CN1223917A (en) | 1999-07-28 |
| EP0920936A3 (en) | 2000-04-26 |
| CA2255279A1 (en) | 1999-06-03 |
| US6390176B1 (en) | 2002-05-21 |
| KR100633030B1 (en) | 2006-12-22 |
| DE59808750D1 (en) | 2003-07-24 |
| ZA9810910B (en) | 1999-05-06 |
| CA2255279C (en) | 2007-02-13 |
| MY131906A (en) | 2007-09-28 |
| DE19753537A1 (en) | 1999-06-10 |
| EP0920936A2 (en) | 1999-06-09 |
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