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EP0741616A1 - Continuous casting ingot mould for guiding continuous castings - Google Patents

Continuous casting ingot mould for guiding continuous castings

Info

Publication number
EP0741616A1
EP0741616A1 EP95906266A EP95906266A EP0741616A1 EP 0741616 A1 EP0741616 A1 EP 0741616A1 EP 95906266 A EP95906266 A EP 95906266A EP 95906266 A EP95906266 A EP 95906266A EP 0741616 A1 EP0741616 A1 EP 0741616A1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
casting
strand
casting mold
mold 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.)
Granted
Application number
EP95906266A
Other languages
German (de)
French (fr)
Other versions
EP0741616B1 (en
Inventor
Fritz-Peter Pleschiutschnigg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0741616A1 publication Critical patent/EP0741616A1/en
Application granted granted Critical
Publication of EP0741616B1 publication Critical patent/EP0741616B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

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
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the invention relates to a continuous casting mold for guiding strands.
  • the object of the invention is therefore to design the continuous casting mold in such a way that the swinging of the strand, which is also known in the literature as "snaking", is prevented.
  • the object is achieved by the features of claim 1.
  • the remaining claims contain embodiments of the invention according to claim 1.
  • Fig. 1 Section of a mold with strand guidance in the casting direction
  • Fig. 2 Section of a mold, horizontally
  • Fig. 3 Section of a mold, horizontally
  • the invention now consists in that the concave strand guide in the area of the mold and thus the convex strand ensure guiding and centering of the strand, which leads to a surface-specific, uniform contact of the strand in the mold, whereby a high degree of symmetry in the Formation of the strand shell with regard to
  • a slab system is described in Fig. 1-3, which consists of a width-adjustable mold (1), the broad sides of which have a concave shape symmetrical to the central axis (12), from the upper edge of the mold (9) to the exit of the mold (10) is constant or uniformly reduced to a rectangular format.
  • the concavity or the convex slab has a height (17) of max. 5% of the slab thickness based on the strand thickness (2a).
  • the profile runs linearly parallel to one another or also with an angle of repose (19) ⁇ . the max. Is 2 ⁇ .
  • Di "shape of the mold in the area of the concavity can symmetrically to the central axes (1., And (6) but not be linear.
  • pouring nozzle (1 a) and casting powder (1b) are molded.
  • pouring without immersion pouring and casting powder possible in the sense of this invention.
  • the constant concavity of the broad sides specified in the mold is reduced to the rectangular shape in the strand guide or is uniformly reduced over the length of the mold and already enters the strand guide with a rectangular format at the outlet of the mold.
  • a corresponding shape can also be selected for blooms (Fig. 4) and billets (Fig. 5).
  • two opposite sides or all four sides of the strand can be convexly shaped in the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Epoxy Compounds (AREA)
  • Confectionery (AREA)
  • Metal Rolling (AREA)
  • Casting Devices For Molds (AREA)

Abstract

The invention relates to a continuous casting mould for producing continuously cast metal in the form of slabs, thin slabs, cogs and billets. The ingot mould ensures a high degree of casting reliability at casting rates of up to 6 m/min. The cambered shape of the ingot mould ensures that the casting is centred during the casting process, thus preventing or damping sideways motion of the mould (snaking) in the direction of one of its small sides. This symmetrical motion of the box when pouring into the ingot mould takes place results in an even symmetrical structure in the casting shell, the temperature field (isotherms) thereof, the extraction forces and the stress on the casting shell in relation to the casting axis in the direction of pouring, even where there is swing of the casting along the casting guide.

Description

Stranggießkokiile zum Führen von SträngenContinuous casting coke for guiding strands
Die Erfindung betrifft eine Stranggießkokille zum Führen von Strängen.The invention relates to a continuous casting mold for guiding strands.
Aus der DE 39 07 351 A1 ist bekannt, Stranggießkokillen für Dünnbrammen in ihrem oberen Teil, also im Bereich des Eintrittsquerschnitts, mit einer trichterförmigen Ausnehmung zu versehen. Diese Maßnahme hat zwar Einfluß auf die Strangdicke, nicht jedoch auf die Gießgeschwindigkeit.From DE 39 07 351 A1 it is known to provide continuous casting molds for thin slabs with a funnel-shaped recess in their upper part, that is to say in the region of the inlet cross section. This measure has an influence on the strand thickness, but not on the casting speed.
Für die Gießgeschwindigkeit bei Standard-Strangformaten haben sich im Laufe der Entwicklung folgende Grenzwerte herauskristallisiert:The following limit values have emerged for the casting speed for standard strand formats:
- für Brammen der Dicke z.B. 230 mm ca. 1.8 - 2.0 m/min- for slabs of thickness e.g. 230 mm approx. 1.8 - 2.0 m / min
- für Vorblöcke der Dicke z.B. 270 mm ca. 1.5 - 1.7 m/min- for blocks of thickness e.g. 270 mm approx. 1.5 - 1.7 m / min
- für Blöcke des Formats z.B. 100 x 100 mm ca. 2.5 m/min.- for blocks of the format e.g. 100 x 100 mm approx.2.5 m / min.
Werden o.-ose Höchstwerte überschritten, nehmen Gießstörungen in Form von Durchbrüchen erheblich zu. Das ist eine Folge des bei höheren Geschwindigkeiten auftretenden Pendeln des Stranges in der Strangführung. Er pendelt dabei in Richtung der Schmalseiten hin und her. Dieses Pendeln führt zu einem ungleichförmigen Kontakt des Stranges mit den Kokillenschmalseiten und damit zu einem unsymmetrischen Wärmetransport und zu einem unsymmetrischen Isothermenprofil in der Strangschale sowohl in Gießrichtung als auch senkrecht dazu.If o.-ose maximum values are exceeded, casting disruptions in the form of breakthroughs increase considerably. This is a consequence of the swinging of the strand in the strand guide, which occurs at higher speeds. He swings back and forth in the direction of the narrow sides. This oscillation leads to non-uniform contact of the strand with the narrow sides of the mold and thus to an asymmetrical heat transfer and to an asymmetrical isothermal profile in the strand shell both in the casting direction and perpendicular to it.
Diese Störung der Isothermen führt zu Spannungen und unterschiedlichen Strangschalendicken und damit auch zu Verwerfungen der Strangschale, was zu einer Erhöhung der Durchbruchrate führt.This disturbance of the isotherms leads to stresses and different strand shell thicknesses and thus also to warping of the strand shell, which leads to an increase in the breakthrough rate.
Aufgabe der Erfindung ist es daher, die Stranggießkokille so auszugestalten, daß das Pendeln des Stranges, das auch in der Literatur als "snaking" bekannt ist, unterbunden wird. Die Aufgabe wird gelöst durch die Merkmale des Anspruches 1. Die übrigen Ansprüche beinhalten Ausgestaltungen der Erfindung nach Anspruch 1.The object of the invention is therefore to design the continuous casting mold in such a way that the swinging of the strand, which is also known in the literature as "snaking", is prevented. The object is achieved by the features of claim 1. The remaining claims contain embodiments of the invention according to claim 1.
Die Figuren dienen zur Veranschaulichung der Erfindung.The figures serve to illustrate the invention.
Es zeigen:Show it:
Fig. 1 : Schnitt einer Kokille mit Strangführung in GießrichtungFig. 1: Section of a mold with strand guidance in the casting direction
Fig. 2: Schnitt einer Kokille, horizontalFig. 2: Section of a mold, horizontally
Fig. 3: Schnitt einer Kokille, horizontalFig. 3: Section of a mold, horizontally
Fig. 4: VorblockformatFig. 4: Block format
Fig. 5: KnüppelformatFig. 5: billet format
Die Erfindung besteht nun darin, daß durch die konkave Strangführung im Bereich der Kokille und dem damit konvexen Strang eine Führung und Zentrierung des Stranges gewährleistet wird, der zu einem fiächenspezifischen gleichförmigen Kontakt des Stranges in der Kokille führt, wodurch ein hohes Maß an Symmetrie in der Ausbildung der Strangschale hinsichtlichThe invention now consists in that the concave strand guide in the area of the mold and thus the convex strand ensure guiding and centering of the strand, which leads to a surface-specific, uniform contact of the strand in the mold, whereby a high degree of symmetry in the Formation of the strand shell with regard to
- Wärmetransport,- heat transfer,
- Isothermenprofil und- isothermal profile and
- Strangschalenprofil- Strand shell profile
sichergestellt wird. Diese Maßnahme und ihre Wirkung auf eine gleichförmige Ausbildung der Strangschale führt zu der überraschenden Wirkung die Gießgeschwindigkeit für die oben genannten Strangformate bis auf 6 m/min anheben zu können.is ensured. This measure and its effect on a uniform training of the strand shell leads to the surprising effect of the casting for the ten top Named n strand formats up to 6 m / min to be lifted.
Als Beispiel wird in Fig. 1-3 eine Brammenanlage beschrieben, die aus einer breitenverstellbaren Kokille (1) besteht, deren Breitseiten eine symmetrisch zur Mittenachse (12) verlaufende konkave Form aufweisen, die von Oberkante der Kokille (9) bis zum Austritt der Kokille (10) konstant ist oder gleichförmig auf ein Rechteckformat zurückgenommen wird. Die Konkavität bzw. die konvexe Bramme weist eine Höhe (17) von max. 5% der Brammendicke bezogen auf die Strangdicke (2a).As an example, a slab system is described in Fig. 1-3, which consists of a width-adjustable mold (1), the broad sides of which have a concave shape symmetrical to the central axis (12), from the upper edge of the mold (9) to the exit of the mold (10) is constant or uniformly reduced to a rectangular format. The concavity or the convex slab has a height (17) of max. 5% of the slab thickness based on the strand thickness (2a).
Im Verstellbereich (16) der Schmalseiten (5) verläuft das Profil linear parallel zueinander oder auch mit einem Böschungswinkel (19) α. der max. 2^ beträgt.In the adjustment area (16) of the narrow sides (5) the profile runs linearly parallel to one another or also with an angle of repose (19) α. the max. Is 2 ^.
Di« Form der Kokille im Bereich der Konkavität kann symmetrisch zu den Mittenachsen (1 . , und (6) linear aber auch nicht linear sein. In dem vorliegenden Beispiel wird mit Tauchausguß (1 a) und Gießpulver (1b) gegossen. Selbstverständlich ist auch ein Gießen ohne Tauchausguß und Gießpulver im Sinne dieser Erfindung möglich.Di "shape of the mold in the area of the concavity can symmetrically to the central axes (1., And (6) but not be linear. In the present example, with pouring nozzle (1 a) and casting powder (1b) molded. Of course, also pouring without immersion pouring and casting powder possible in the sense of this invention.
Die in der Kokille vorgegebene konstante Konkavität der Breitseiten wird in die Strangführung auf Rechteckformat zurückgenommen oder wird über die Kokillenlänge gleichförmig zurückgenommen und tritt bereits am Austritt der Kokille mit einem Rechteckformat in die Strangführung ein.The constant concavity of the broad sides specified in the mold is reduced to the rectangular shape in the strand guide or is uniformly reduced over the length of the mold and already enters the strand guide with a rectangular format at the outlet of the mold.
Eine entsprechende Form kann auch für Vorblöcke (Fig. 4) und auch Knüppel (Fig. 5) gewählt werden. Hierbei können zwei gegenüberliegende Seiten oder auch alle vier Seiten des Stranges konvex in der Kokille geformt werden. BezugszeichenlisteA corresponding shape can also be selected for blooms (Fig. 4) and billets (Fig. 5). Here, two opposite sides or all four sides of the strand can be convexly shaped in the mold. Reference list
1 Stranggießkokille 1 a Tauchausguß 10 Kokillenaustrittsoffnung1 continuous casting mold 1 a immersion nozzle 10 mold outlet opening
1 b Gießpulver 11 konkave Form der Kokillenbreit-seite1 b casting powder 11 concave shape of the mold wide side
2 Gießstrang 11 a konkave Form der Kokillenbreit-seite 2a Strangdicke 12 Mittenachse2 casting strand 11 a concave shape of the mold wide side 2a strand thickness 12 center axis
3 Breitseitenplatten 13a konkaver Kreisradius, Mitte Kokille3 broad side plates 13a concave circle radius, middle mold
3a Lange der Breitseitenplatten 13b konvexer Kreisradius, Kokille außen3a length of the broad side plates 13b convex circle radius, mold outside
4 Strangbreite 13c konkaver Kreisradius, Mitte Kokille4 strand width 13c concave circle radius, middle of mold
5 Schmaiseitenplatten, 13d konvexer Kreisradius, Kokille außen breitenverstellbar 14 Wendepunkt5 Schmais side plates, 13d convex circle radius, mold outside adjustable width 14 turning point
5 Strangadernverlauf 15 Minimalbreite5 strand vein course 15 minimum width
6a Strangführung 16 Schmalseitenverstellbereich6a strand guide 16 narrow side adjustment range
7 Stutzrollenpaare 16+15 Maximaibreite 7c Stützlager 17 Höhe der Strangbombierung7 pairs of support rollers 16 + 15 maximum width 7c support bearing 17 Height of the crowning
7d Sumpfspitze 18 Richtung des Strangadern- Verlaufs7d swamp tip 18 direction of the strand vein course
7n letztes Stützroilenpaar 19 Böschungswinkel α7n last pair of support pipes 19 slope angle α
8 Bombierung8 crowning
9 Hohenabschnitt der Stranggieß -kokille, Oberkante Kokille, Kokilleneintrittsöffnung 9 High section of the continuous casting mold, upper edge of the mold, mold inlet opening

Claims

Patentansprüche: Claims:
1. Stranggießkokille zum Führen von Strängen, insbesondere aus Stahl, bestehend aus einem Paar von gekühlten Breitseitenplatten und zwischen diesen fest angeordneten oder auf die Strangbreite einsteilbaren Schmaiseitenplatten, wobei die Breitseitenplatten bombiert, d.h. konkav, ausgeführt sind und sich die Bombierung (8), beginnend an einem Höhenabschnitt (9), der an einer beliebigen Stelle der oberen 80% der Kokiiienhöhe, insbesondere der oberen 30%, angeordnet sein kann, bis zur Kokillenaustrittsöffnung (10) einschließlich erstreckt.1. Continuous casting mold for guiding strands, in particular made of steel, consisting of a pair of cooled broad side plates and between them fixedly arranged or adjustable on the strand width Schmaiseitenplatten, the broad side plates domed, i.e. are concave, and the crowning (8), starting at a height section (9), which can be arranged anywhere at the upper 80% of the mold height, in particular the upper 30%, extends to the mold outlet opening (10) inclusive .
2. Stranggießkokille nach Anspruch 1 , dadurch gekennzeichnet, daß die Bombierung unter Einbeziehung des Schrumpfmaßes ausgeführt ist.2. Continuous casting mold according to claim 1, characterized in that the crowning is carried out including the shrinkage.
3. Stranggießkokille nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Bombierung (8) als konkave Form (11) vom Beginn der einen Schmalseitenplatte (5) bis zum Beginn der anderen, gegenüberliegenden Schmalseitenplatte (5) verläuft.3. Continuous casting mold according to claim 1 or 2, characterized in that the crown (8) as a concave shape (11) from the beginning of one narrow side plate (5) to the beginning of the other, opposite narrow side plate (5).
4. Stranggießkokille nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die konkave Form (11) von einer Mittenachse (12) in Richtung auf die Schmaiseitenplatten (5) jeweils linear verläuft.4. Continuous casting mold according to one of claims 1 to 3, characterized in that the concave shape (11) from a central axis (12) in the direction of the Schmaiseitenplatten (5) each linear.
5. Stranggießkokille nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die konkave Form (11 ) von der Mittenachse (12) in Richtung auf die Schmaiseitenplatten (5) jeweils nichtlinear verläuft.5. Continuous casting mold according to one of claims 1 to 4, characterized in that the concave shape (11) from the central axis (12) in the direction of the Schmaiseitenplatten (5) each non-linear.
6. Stranggießkokille nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die konkave Form (11) von der Mittenachse (12) ausgehend aus Kreisradien (13) mit gemeinsamem Wendepunkt (14) gebildet sind. 6. Continuous casting mold according to one of claims 1 to 5, characterized in that the concave shape (11) from the central axis (12) starting from circular radii (13) with a common turning point (14) are formed.
7. Stranggießkokille nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die konkave Form (11) von der Mittenachse (12) sich nur über einen Teil der Länge (3a) der Breitseitenplatten (3) erstreckt, die der minimal gegossenen Breite des schmälsten Gießstranges (2) entspricht und daß im Bereich der Minimalbreite (15) und der Maximalbreite (15+16) unterschiedlich breiter Gießstränge (2) die Breitseitenplatten (3) parallel verlaufen und in diesem Bereich die Schmaiseitenplatten (5) auf unterschiedlichen Breiten des Gießstranges (2) einstellbar sind.7. Continuous casting mold according to one of claims 1 to 6, characterized in that the concave shape (11) of the central axis (12) extends only over part of the length (3a) of the broad side plates (3), which is the minimum cast width of the corresponds to the narrowest casting strand (2) and that in the area of the minimum width (15) and the maximum width (15 + 16) of different width casting strands (2) the broad side plates (3) run parallel and in this area the Schmais side plates (5) on different widths of the casting strand (2) are adjustable.
8. Stranggießkokille nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß in den Bereichen der Minimalbreite (15) und der Maximalbreite (15+16) die Breitseitenplatten (3) linear und unter einem Winkel (Alpha) (19), die Strangdicke (2a) nach außen vermindernd, verlaufen.8. Continuous casting mold according to one of claims 1 to 7, characterized in that in the areas of the minimum width (15) and the maximum width (15 + 16) the broad side plates (3) linearly and at an angle (alpha) (19), the strand thickness (2a) reducing to the outside.
9. Stranggießkokille nach einem der Ansprüche 1 bis 8. dadurch gekennzeichnet, daß die konkave Form (11) der Breitseitenplatten (3) im Bereich der Mittenachse (12) eine Höhe (18) von maximal 5% der Strangdicke (2a) am Übergangsbereich von Minimalbreite (15) und Maximaibreite (15+16) des Gießstrangs (2) aufweist.9. Continuous casting mold according to one of claims 1 to 8, characterized in that the concave shape (11) of the broad side plates (3) in the region of the central axis (12) has a height (18) of at most 5% of the strand thickness (2a) at the transition region from Has minimum width (15) and maximum width (15 + 16) of the casting strand (2).
10. Stranggießkokille nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die konkave Form (11) der Breitseitenplatten (3) bis zum Kokillenaustritt (10) auf ein Rechteckformat zurückgenommen ist.10. Continuous casting mold according to one of claims 1 to 9, characterized in that the concave shape (11) of the broad side plates (3) up to the mold outlet (10) is withdrawn to a rectangular format.
11. Verwendung der Stranggießkokille nach einem der vorhergehenden Ansprüche zum Gießen von Strängen mit Strangdicken von 40 bis 400 mm, insbesondere 80 bis 300 mm. 11. Use of the continuous casting mold according to one of the preceding claims for casting strands with strand thicknesses of 40 to 400 mm, in particular 80 to 300 mm.
EP95906266A 1994-01-28 1995-01-20 Continuous casting ingot mould for guiding continuous castings Revoked EP0741616B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4403050 1994-01-28
DE4403050A DE4403050C1 (en) 1994-01-28 1994-01-28 Continuous casting mold for guiding strands
PCT/DE1995/000092 WO1995020443A1 (en) 1994-01-28 1995-01-20 Continuous casting ingot mould for guiding continuous castings

Publications (2)

Publication Number Publication Date
EP0741616A1 true EP0741616A1 (en) 1996-11-13
EP0741616B1 EP0741616B1 (en) 1999-03-17

Family

ID=6509217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95906266A Revoked EP0741616B1 (en) 1994-01-28 1995-01-20 Continuous casting ingot mould for guiding continuous castings

Country Status (14)

Country Link
US (1) US5730207A (en)
EP (1) EP0741616B1 (en)
JP (1) JP3048641B2 (en)
KR (1) KR100352220B1 (en)
CN (1) CN1064873C (en)
AT (1) ATE177664T1 (en)
AU (1) AU692823B2 (en)
BR (1) BR9506591A (en)
CA (1) CA2181903A1 (en)
DE (2) DE4403050C1 (en)
ES (1) ES2131303T3 (en)
RU (1) RU2139166C1 (en)
WO (1) WO1995020443A1 (en)
ZA (1) ZA95672B (en)

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Also Published As

Publication number Publication date
RU2139166C1 (en) 1999-10-10
CN1064873C (en) 2001-04-25
JPH09509366A (en) 1997-09-22
AU692823B2 (en) 1998-06-18
ATE177664T1 (en) 1999-04-15
US5730207A (en) 1998-03-24
KR100352220B1 (en) 2002-11-11
BR9506591A (en) 1997-09-16
JP3048641B2 (en) 2000-06-05
ES2131303T3 (en) 1999-07-16
AU1453295A (en) 1995-08-15
ZA95672B (en) 1995-09-28
CN1139891A (en) 1997-01-08
DE59505379D1 (en) 1999-04-22
EP0741616B1 (en) 1999-03-17
DE4403050C1 (en) 1995-09-28
WO1995020443A1 (en) 1995-08-03
CA2181903A1 (en) 1995-08-03

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