EP1206986B1 - Continuous casting mould, especially for casting billet strands and blooms - Google Patents

Continuous casting mould, especially for casting billet strands and blooms Download PDF

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Publication number
EP1206986B1
EP1206986B1 EP01125595A EP01125595A EP1206986B1 EP 1206986 B1 EP1206986 B1 EP 1206986B1 EP 01125595 A EP01125595 A EP 01125595A EP 01125595 A EP01125595 A EP 01125595A EP 1206986 B1 EP1206986 B1 EP 1206986B1
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EP
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Prior art keywords
gap
mould
mold
coolant
cooling medium
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Expired - Lifetime
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EP01125595A
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German (de)
French (fr)
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EP1206986A1 (en
Inventor
Adolf Dipl.-Ing. Zajber
Uwe Plociennik
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SMS Siemag AG
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SMS Demag AG
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    • 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
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to a continuous casting mold, in particular for casting billets or billet strands, the pouring tube is surrounded by a mold housing with gap spacing, in which a cooling medium flow can be supplied and discharged again, wherein the cooling medium gap is so different over the mold height that in the upper die area the cooling medium gap is narrow in accordance with a high cooling medium speed and relatively wide in the lower die area, corresponding to a relatively lower cooling medium speed,
  • the liquid steel solidifies in the course of the casting process from outside to inside in the continuous casting mold.
  • the regulation of the heat removal via spatially coordinated water velocities can take place in the continuous casting mold. In the meniscus of the mold bath mirror, a maximum of heat must be dissipated, while at the outlet of the continuous casting mold a correspondingly smaller amount of heat has to be dissipated.
  • each of the superimposed cooling zones is assigned its own supply and discharge line.
  • the invention has for its object to control the speed of the cooling medium in the cooling passage of the cooling jacket of a continuous casting mold of the type mentioned above the geometry of theissermediumleitmantels even more precisely.
  • the stated object is achieved in that the cooling medium gap is additionally increased in corner areas and that the cooling medium gap over the Kokillenbreitcondition and / or the Kokillenlnaturessian is different widths, wherein the narrow gap is provided in each case in the middle of the page.
  • regulation of the water velocities and thus of the heat dissipation can be achieved by means of this geometric design of the coolant media channels. Since the corners of the cast strand require less heat dissipation compared to the surfaces, the cooling medium speed can be reduced somewhat here. As a result, a greater cooling medium speed is achieved in the side centers through the narrow gaps, and a lower speed is achieved at the corners by the bulges.
  • At least the vertical contour of the outer cooling medium gap wall corresponds to a negative form of the solidification line in the casting strand which runs from top to bottom.
  • This negative mold leads to small cooling medium velocities in the lower mold area and through the narrow gap to high cooling medium velocities in the upper mold area.
  • the pouring tube is cylindrical and the mold housing (the Wasserleitmantel) has the vertical contour.
  • a favorable flow with a small flow resistance also arises from the fact that the corner regions of a horizontal contour are each formed bulging in an oval shape.
  • the continuous casting mold is used in particular for casting billet or billet strands and is provided with a pouring pipe 1 and a mold housing 2, which forms a Wasserleitmantel 2a.
  • the mold housing 2 is located with gap distance 3 to the pouring pipe 1.
  • the cooling medium 4 as usual water or water with additives, is fed into the cooling medium gap 5 on the mold height 6 in the lower mold area 6b and under heating when rising in the upper mold area 6a again discharged in the direction of the arrow after heat absorption.
  • the cooling medium gap 5 is of different widths over the mold height 6 in that the cooling medium gap 5 is narrow in the upper mold region 6a, corresponding to a high cooling medium velocity, and relatively wide in the lower mold region 6b, corresponding to a relatively lower cooling medium velocity ,
  • the flow velocity of the cooling medium 4 depends on the negative shape of the solidification line in the cast strand, after which at least the vertical contour 7 of the outer cooling medium gap wall 5a is fixed (FIG. 1).
  • the cooling medium gap 5 in the corner regions 8 is additionally enlarged.
  • the cooling medium gap 5 is different in width according to the basic idea about the chill broad side 9 and / or the Kokillenl Kunststoffsseite 10, wherein the narrow gap 11 is in each case in the side center 12.
  • the production of the pouring tube 1 is simple and can be performed very accurate form, since the pouring tube 1 is formed by itself cylindrically and the mold housing 2 has the vertical contour 7 (Fig. 1). The same property results in the horizontal section (FIG. 2) when the corner regions 8 of a horizontal contour 13 are each bulged in an oval shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

A continuous casting mold comprise a casting tube (1) surrounded by a mold housing with a gap (3) into which a cooling medium stream (4) can be introduced and removed. The gap varies over the height of the mold so that it is narrow in the upper part of the mold and corresponds to a high cooling medium speed and it is relatively wide in the lower region of the mold corresponding to a relatively low cooling medium speed. Preferred Features: The contour of the outer cooling medium gap wall (5a) corresponds to the negative mold of the solidification line in the casting strand running from above to below.

Description

Die Erfindung betrifft eine Stranggießkokille, insbesondere zum Gießen von Knüppel- oder Vorblocksträngen, deren Gießrohr von einem Kokillengehäuse mit Spaltabstand umgeben ist, in den ein Kühlmediumstrom zuführbar und wieder abführbar ist, wobei der Kühlmedium-Spalt derart über die Kokillenhöhe unterschiedlich breit ist, dass im oberen Kokillenbereich der Kühlmedium-Spalt eng ist entsprechend einer hohen Kühlmedium-Geschwindigkeit und im unteren Kokillenbereich relativ breit ist, entsprechend einer relativ niedrigeren Kühlmedium-Geschwindigkeit,The invention relates to a continuous casting mold, in particular for casting billets or billet strands, the pouring tube is surrounded by a mold housing with gap spacing, in which a cooling medium flow can be supplied and discharged again, wherein the cooling medium gap is so different over the mold height that in the upper die area the cooling medium gap is narrow in accordance with a high cooling medium speed and relatively wide in the lower die area, corresponding to a relatively lower cooling medium speed,

Beim Stranggießen von Metallen, insbesondere von Stahl, erstarrt der flüssige Stahl im Verlauf des Gießprozesses von außen nach innen in der Stranggießkokille. Die Erstarrung erfolgt näherungsweise hyperbelförmig nach der Gleichung s = k × V t

Figure imgb0001
(s = Strangschalendicke; k = Abkühlungsfaktor; t = Zeit).
Um die sich daraus ergebende Erstarrungskurve schon in der Stranggießkokille zu berücksichtigen, kann in der Stranggießkokille die Regulierung der Wärmeabfuhr über örtlich abgestimmte Wassergeschwindigkeiten erfolgen. Im Meniskus des Kokillen-Badspiegels muss ein Maximum an Wärme abgeführt werden, während am Austritt der Stranggießkokille eine entsprechend geringere Wärmemenge abzuführen ist.In the continuous casting of metals, in particular of steel, the liquid steel solidifies in the course of the casting process from outside to inside in the continuous casting mold. The solidification is approximately hyperbolic according to the equation s = k × V t
Figure imgb0001
 (s = strand shell thickness, k = cooling factor, t = time).
In order to take the resulting solidification curve into account already in the continuous casting mold, the regulation of the heat removal via spatially coordinated water velocities can take place in the continuous casting mold. In the meniscus of the mold bath mirror, a maximum of heat must be dissipated, while at the outlet of the continuous casting mold a correspondingly smaller amount of heat has to be dissipated.

Aus der DE-OS 14 83 556 ist eine Kühlzonen-Einteilung auf die Kokillenhöhe vorgesehen, wobei jeder der übereinanderliegenden Kühlzonen eine eigene Zu- und Abführleitung zugeteilt ist.From DE-OS 14 83 556 a cooling zones division is provided on the mold height, each of the superimposed cooling zones is assigned its own supply and discharge line.

Aus der DE-AS 1 608 059 ist es bekannt, das Kühlmedium in senkrechten Kanälen von unten nach oben durch den Kühlkasten der Kokille zu leiten und einen hohen Gegendruck aufzubauen.From DE-AS 1 608 059 it is known to direct the cooling medium in vertical channels from bottom to top through the cooling box of the mold and build up a high back pressure.

Aus JP-A-03 042 144 und aus JP-A-59 070 442 ist es bekannt, dem Kokillengehäuse (Kühlwassermantel) eine solche Kontur zu geben, dass das Kühlmedium im oberen Teil um die Kokille durch einen engeren Spalt schneller und im unteren Teil durch einen weiteren Spalt langsamer fließt.From JP-A-03 042 144 and JP-A-59 070 442 it is known to give the mold housing (cooling water jacket) such a contour that the cooling medium in the upper part around the mold by a narrower gap faster and in the lower part flows slower through another gap.

Der Erfindung liegt die Aufgabe zugrunde, die Geschwindigkeit des Kühlmediums im Kühlkanal des Kühlmantels einer Stranggießkokille der eingangs genannten Art über die Geometrie des Kühlmediumleitmantels noch genauer zu steuern.The invention has for its object to control the speed of the cooling medium in the cooling passage of the cooling jacket of a continuous casting mold of the type mentioned above the geometry of the Kühlmediumleitmantels even more precisely.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Kühlmedium-Spalt in Eckenbereichen zusätzlich vergrößert ist und dass der Kühlmedium-Spalt über die Kokillenbreitseiten und / oder die Kokillenlängsseiten unterschiedlich breit ist, wobei der enge Spalt jeweils in der Seitenmitte vorgesehen ist. Dadurch kann durch diese geometrische Gestaltung der Kühlmedienkanäle eine Regulierung der Wassergeschwindigkeiten und damit der Wärmeabfuhr erreicht werden. Da die Ecken des Gießstrangs im Vergleich zu den Flächen weniger Wärmeabfuhr erfordern, kann hier die Kühlmedium-Geschwindigkeit etwas verringert werden. Dadurch wird in den Seitenmitten durch die engen Spalte wiederum eine größere Kühlmedium-Geschwindigkeit und an den Ecken durch die Ausbauchungen eine geringere Geschwindigkeit erzielt.The stated object is achieved in that the cooling medium gap is additionally increased in corner areas and that the cooling medium gap over the Kokillenbreitseiten and / or the Kokillenlängsseiten is different widths, wherein the narrow gap is provided in each case in the middle of the page. As a result, regulation of the water velocities and thus of the heat dissipation can be achieved by means of this geometric design of the coolant media channels. Since the corners of the cast strand require less heat dissipation compared to the surfaces, the cooling medium speed can be reduced somewhat here. As a result, a greater cooling medium speed is achieved in the side centers through the narrow gaps, and a lower speed is achieved at the corners by the bulges.

Dabei entspricht zumindest die senkrechte Kontur der äußeren Kühlmediumspalt-Wandung einer Negativform der Erstarrungslinie im Gießstrang die von oben nach unten verläuft. Diese Negativform führt zu kleinen Kühlmedium-Geschwindigkeiten im unteren Kokillenbereich und durch den engen Spalt zu hohen Kühlmedium-Geschwindigkeiten im oberen Kokillenbereich.
Für die Fertigung ist es vorteilhaft, dass das Gießrohr zylindrisch ausgebildet ist und das Kokillengehäuse (der Wasserleitmantel) die senkrechte Kontur aufweist.In this case, at least the vertical contour of the outer cooling medium gap wall corresponds to a negative form of the solidification line in the casting strand which runs from top to bottom. This negative mold leads to small cooling medium velocities in the lower mold area and through the narrow gap to high cooling medium velocities in the upper mold area.
For the production, it is advantageous that the pouring tube is cylindrical and the mold housing (the Wasserleitmantel) has the vertical contour.

Eine günstige Strömung bei kleinem Strömungswiderstand entsteht ferner dadurch, dass die Eckbereiche einer horizontalen Kontur jeweils ovalförmig ausbauchend ausgebildet sind.A favorable flow with a small flow resistance also arises from the fact that the corner regions of a horizontal contour are each formed bulging in an oval shape.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und wird nachfolgend näher erläutert.In the drawing, an embodiment of the invention is shown schematically and will be explained in more detail below.

Es zeigen:

Fig. 1
einen senkrechten Schnitt durch die Stranggießkokille und
Fig. 2
einen horizontalen Schnitt gemäß der Schnittangabe A-A in Fig. 1.
Show it:
Fig. 1
a vertical section through the continuous casting mold and
Fig. 2
a horizontal section according to the section AA in Fig. 1st

Die Stranggießkokille dient insbesondere zum Gießen von Knüppel- oder Vorblocksträngen und ist mit einem Gießrohr 1 und einem Kokillengehäuse 2 versehen, das einen Wasserleitmantel 2a bildet. Das Kokillengehäuse 2 liegt mit Spaltabstand 3 um das Gießrohr 1. Das Kühlmedium 4, wie üblich Wasser oder Wasser mit Zusätzen, wird in den Kühlmedium-Spalt 5 auf der Kokillenhöhe 6 im unteren Kokillenbereich 6b zugeführt und unter Erwärmung beim Hochsteigen im oberen Kokillenbereich 6a wieder in Pfeilrichtung nach erfolgter Wärmeaufnahme abgeführt.The continuous casting mold is used in particular for casting billet or billet strands and is provided with a pouring pipe 1 and a mold housing 2, which forms a Wasserleitmantel 2a. The mold housing 2 is located with gap distance 3 to the pouring pipe 1. The cooling medium 4, as usual water or water with additives, is fed into the cooling medium gap 5 on the mold height 6 in the lower mold area 6b and under heating when rising in the upper mold area 6a again discharged in the direction of the arrow after heat absorption.

Der Kühlmedium-Spalt 5 ist derart über die Kokillenhöhe 6 unterschiedlich breit, indem im oberen Kokillenbereich 6a der Kühlmedium-Spalt 5 eng ist, entsprechend einer hohen Kühlmedium-Geschwindigkeit, und im unteren Kokillenbereich 6b relativ breit ist, entsprechend einer relativ niedrigeren Kühlmedium-Geschwindigkeit. Die Strömungsgeschwindigkeit des Kühlmediums 4 richtet sich dabei nach der Negativform der Erstarrungslinie im Gießstrang, nach der zumindest die senkrechte Kontur 7 der äußeren Kühlmedium-Spaltwandung 5a festgelegt ist (Fig. 1).The cooling medium gap 5 is of different widths over the mold height 6 in that the cooling medium gap 5 is narrow in the upper mold region 6a, corresponding to a high cooling medium velocity, and relatively wide in the lower mold region 6b, corresponding to a relatively lower cooling medium velocity , The flow velocity of the cooling medium 4 depends on the negative shape of the solidification line in the cast strand, after which at least the vertical contour 7 of the outer cooling medium gap wall 5a is fixed (FIG. 1).

Entsprechend dem Schnitt A-A in der Horizontalen (Fig. 2) ist der Kühlmedium-Spalt 5 in den Eckenbereichen 8 zusätzlich vergrößert. Der Kühlmedium-Spalt 5 ist nach dem Grundgedanken über die Kokillenbreitseite 9 und / oder die Kokillenlängsseite 10 unterschiedlich breit, wobei der enge Spalt 11 jeweils in der Seitenmitte 12 liegt.Corresponding to the section A-A in the horizontal (FIG. 2), the cooling medium gap 5 in the corner regions 8 is additionally enlarged. The cooling medium gap 5 is different in width according to the basic idea about the chill broad side 9 and / or the Kokillenlängsseite 10, wherein the narrow gap 11 is in each case in the side center 12.

Die Herstellung des Gießrohrs 1 ist einfach und kann sehr formgenau durchgeführt werden, da das Gießrohr 1 für sich alleine zylindrisch ausgebildet ist und das Kokillengehäuse 2 die senkrechte Kontur 7 aufweist (Fig. 1). Dieselbe Eigenschaft ergibt sich im horizontalen Schnitt (Fig. 2), wenn die Eckenbereiche 8 einer horizontalen Kontur 13 jeweils ovalförmig ausgebaucht sind.The production of the pouring tube 1 is simple and can be performed very accurate form, since the pouring tube 1 is formed by itself cylindrically and the mold housing 2 has the vertical contour 7 (Fig. 1). The same property results in the horizontal section (FIG. 2) when the corner regions 8 of a horizontal contour 13 are each bulged in an oval shape.

Die jeweilige Spaltbreite folgt der Funktion Spalt = f (h) gemäß Fig. 1 und der Funktion Spalt = f (x) gemäß Fig. 2.The respective gap width follows the function gap = f (h) according to FIG. 1 and the function gap = f (x) according to FIG. 2.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Gießrohrcasting tube
22
Kokillengehäusemold housing
2a2a
WasserleitmantelWasserleitmantel
33
Spaltabstandgap distance
44
Kühlmediumcooling medium
55
Kühlmedium-SpaltCooling medium gap
5a5a
Kühlmedium-SpaltwandungCooling medium Spaltwandung
66
Kokillenhöhemold height
6a6a
oberer Kokillenbereichupper mold area
6b6b
unterer Kokillenbereichlower mold area
77
senkrechte Konturvertical contour
88th
Eckenbereichcorner area
99
Kokillenbreitseitemold broad
1010
KokillenlängsseiteKokillenlängsseite
1111
enger Spaltnarrow gap
1212
Seitenmittepage center
1313
horizontale Konturhorizontal contour

Claims (4)

  1. Continuous casting mould, particularly for casting billet or bloom strips, the pouring pipe (1) of which is surrounded by a mould housing (2) with a gap spacing (3), into which a coolant flow (4) can be fed and discharged again, wherein the coolant gap (5) is of differing width over the mould height (6) in such a manner that in the upper mould region (6a) the coolant gap (5) is narrow in correspondence with a high coolant speed and in the lower mould region (6b) is relatively wide in correspondence with a relatively low coolant speed, characterised in that the coolant gap (5) in corner regions (8) is additionally enlarged and that the coolant gap (5) over the mould wide sides (9) and/or the mould longitudinal sides (10) is of differing width, wherein the narrow gap (11) is respectively provided in the side centre (12).
  2. Continuous casting mould according to claim 1, characterised in that at least the vertical contour (7) of the outermost coolant gap wall (5a) corresponds with a negative form of the hardening line in the casting strip, which extends from above to below.
  3. Continuous casting mould according to one of claims 1 and 2, characterised in that the pouring pipe (1) is formed to be cylindrical and the mould housing (2) has the vertical contour (7).
  4. Continuous casting mould according to one of claims 1 to 3, characterised in that the corner regions (8) of a horizontal contour (13) are each formed to bulge out in oval shape.
EP01125595A 2000-11-16 2001-10-26 Continuous casting mould, especially for casting billet strands and blooms Expired - Lifetime EP1206986B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10056910A DE10056910A1 (en) 2000-11-16 2000-11-16 Billet and block mold with partially regulated heat dissipation over the mold circumference and mold height
DE10056910 2000-11-16

Publications (2)

Publication Number Publication Date
EP1206986A1 EP1206986A1 (en) 2002-05-22
EP1206986B1 true EP1206986B1 (en) 2006-09-27

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ID=7663584

Family Applications (1)

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EP01125595A Expired - Lifetime EP1206986B1 (en) 2000-11-16 2001-10-26 Continuous casting mould, especially for casting billet strands and blooms

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US (1) US20020129922A1 (en)
EP (1) EP1206986B1 (en)
AT (1) ATE340666T1 (en)
DE (2) DE10056910A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10201502C1 (en) * 2001-10-18 2003-04-24 Sms Demag Ag Optimizing cooling capacity of continuous steel-casting mold, adjusts flow velocity of coolant and available cross section, as function of height in mold
TWI268821B (en) * 2002-04-27 2006-12-21 Sms Demag Ag Adjustment of heat transfer in continuous casting molds in particular in the region of the meniscus
DE10226214A1 (en) 2002-06-13 2003-12-24 Sms Demag Ag Continuous casting mold for liquid metals, especially for liquid steel
DE102005040634A1 (en) * 2005-08-27 2007-03-01 Sms Demag Ag Kokillenbreitseite a funnel kokille
DE102006036708A1 (en) * 2006-08-05 2008-02-07 Sms Demag Ag Continuous casting mold for liquid metals, in particular for liquid steel materials
CN108838352B (en) * 2018-05-25 2023-08-22 中冶连铸技术工程有限责任公司 Crystallizer with double water jacket structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970442A (en) * 1982-10-12 1984-04-20 Mishima Kosan Co Ltd Mold for continuous casting
JPH0342144A (en) * 1989-07-06 1991-02-22 Kawasaki Steel Corp Method for cooling mold for continuous casting and mold thereof
JPH03118943A (en) * 1989-09-29 1991-05-21 Kawasaki Steel Corp Mold and method for continuously casting low and medium carbon steel

Also Published As

Publication number Publication date
ATE340666T1 (en) 2006-10-15
US20020129922A1 (en) 2002-09-19
EP1206986A1 (en) 2002-05-22
DE50111083D1 (en) 2006-11-09
DE10056910A1 (en) 2002-05-29

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