EP0726113B1 - Système d'entrée pour une installation de coulée continue d'aluminium - Google Patents

Système d'entrée pour une installation de coulée continue d'aluminium Download PDF

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Publication number
EP0726113B1
EP0726113B1 EP95118107A EP95118107A EP0726113B1 EP 0726113 B1 EP0726113 B1 EP 0726113B1 EP 95118107 A EP95118107 A EP 95118107A EP 95118107 A EP95118107 A EP 95118107A EP 0726113 B1 EP0726113 B1 EP 0726113B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
stopper
section
cross
inlet
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
Application number
EP95118107A
Other languages
German (de)
English (en)
Other versions
EP0726113A1 (fr
Inventor
C. Jürgen Dipl.-Ing. Moritz
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.)
Vereinigte Aluminium Werke AG
Vaw Aluminium AG
Original Assignee
Vereinigte Aluminium Werke AG
Vaw Aluminium 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
Application filed by Vereinigte Aluminium Werke AG, Vaw Aluminium AG filed Critical Vereinigte Aluminium Werke AG
Publication of EP0726113A1 publication Critical patent/EP0726113A1/fr
Application granted granted Critical
Publication of EP0726113B1 publication Critical patent/EP0726113B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Definitions

  • the invention relates to inlet systems for continuous aluminum casting plants, consisting of a gutter, one inserted into the gutter Inlet nozzle into which a plug for regulating the Melt feed is used and optionally a control system, with which the immersion depth of the stopper within a predetermined Limits are controllable.
  • the object of the invention is therefore the inlet system in aluminum continuous casting plants optimize so that while maintaining of the essential installations the negative pressure at the nozzle inlet and is minimized at the nozzle outlet and the flow conditions be optimized in the inlet nozzle.
  • a procedure for Operation of the inlet system is intended to create vortex formation in the melt reduce so that both on the melt surface in the There is no channel or on the melt surface in the mold Vortex formation occurs.
  • the nozzle contour according to the invention provides that in the middle of the Inlet nozzle has the narrowest cross section and thus the highest Speed is generated in the middle of the nozzle.
  • the shape of the nozzle becomes a stall, which is the cross-section through which the air flows could reduce avoided.
  • the nozzle is thus flows evenly over the entire cross section, whereby an optimal volume flow can be set.
  • the infeed system results different flow conditions, depending on which Nozzle side of the melt flowing in the gutter first is flowed to. Under certain conditions, this leads with conventional infeed systems to an uneven distribution the liquid flow on the inner wall of the nozzle with which As a result, very high flow velocities at certain nozzle cross sections and in other places a flow shadow arises. These conditions have previously disturbed uniformity the flow and also affected the inlet and Flow conditions at the feed nozzle.
  • the inlet system consists of a channel 1 used inlet nozzle 2, in which a plug 3 for regulation of the melt inlet 4 is used. Arrived through the pouring nozzle the melt into the mold 5, where it is formed into an ingot 6 is held on the sprue 7. By lowering a casting table 8 by means of lowering device 9 is the ingot 6 pulled down out of the mold 5.
  • nozzles 2 and plugs 3 are shown in FIG remove. It can be seen that the cross sections X and Y at the nozzle inlet and nozzle outlet in relation to the other cross sections the inlet nozzle are selected large, so that there are low flow rates occur.
  • FIG. 2 It can also be seen from FIG. 2 how the plug 3 enters the nozzle 2 dips.
  • the one remaining between the nozzle 2 and the plug 3 Space is to be seen as an annular gap C and is designed to that the flow fills the entire cross-section evenly. Seen from the inlet side X, the annular gap tapers C, so that a dynamic pressure builds up in the flowing metal counteracts a reduction in the static pressure in the melt.
  • the pressure ratios are also shown by an enlarged level difference - in the example 26 cm and 34 cm - hardly changed.
  • the closely spaced curves for different level differences show that the flow conditions are very stable and even in the case of high negative pressures, the flow in the nozzle is not tears off. It follows that the available cross section is flowed through relatively evenly and none Speed peaks occur.
  • FIGS. 6a, b and 5a, b Inlet systems shown as examples.
  • the vacuum on Nozzle outlet can no longer be dismantled because of the available Cross section at the nozzle outlet through the stall below the Stopper is reduced very much. This creates high negative pressures at the nozzle outlet, which is no longer due to an enlargement the immersion depth of the nozzle can be compensated (see Figure 5a).
  • FIG. 4b shows a known upward closing inlet system shown.
  • the negative pressure increases with increasing Level difference strongly on (see Figure 5b).
  • the metal column above the nozzle inlet in the channel and the associated static pressure is not sufficient to To compensate for the negative pressure that arises at the nozzle inlet.
  • the known inlet system tends to form turbulence. This is shown in FIG. 7 and is shown in following explained in more detail.
  • the melt 4 arrives in the direction of the arrow through the channel 1 to the inlet nozzle 2. Through the nozzle inlet and emerges negative pressure is the melt surface dented by the air pressure, causing the oxide layer to tear open can and oxide or dirt particles sucked into the melt can be.
  • the non-deformable impurities are in the solidification front installed. Arrive at the later rolling process They surface and cause the rolled strip to tear open or damage to the rollers.
  • FIG 8 is a mechanical control of the mold casting system shown schematically for aluminum ingots.
  • the plug is via a mechanical deflection 15 3 moved up or down by means of a push rod 16.
  • float stands for a piece of refractory material, that floats on the metal surface and a lever Metal level reports. In the present case, it becomes the annular gap between nozzle and stopper enlarged or reduced, each after in which direction the melt level deviates from the target value. The feed rate of the molten metal is thus determined by different plug heights regulated.
  • the metal level in the mold 5 can be for various reasons vary.
  • the melting furnace is inclined not continuously, so that gushing in the channel 1 occurs.
  • the metal level in the gutter is also common regulated with a float, so that normally two control systems are coupled together. This leads to a dynamic Control behavior that is constant during the casting phase Correction of the respective plug height is required.
  • FIG. 9 the processes during Opened the stopper.
  • Figure 9.1 is the stopper 3 shown in the nozzle 2 in the closed position. Through the closing edge 21 of the plug 3, the nozzle opening 22 is closed.
  • the closing edge 21 is around a gap of approximately 2 up to 3 mm from the nozzle inlet opening 22. Thereby melt reaches nozzle 2 and flows at stopper 3 along to the narrowest point approximately in the middle of the nozzle. The Melt appears as a thin jet 23 at the lower end of the nozzle out.
  • the invention provides that the Nozzle is already sealed at the nozzle inlet. This is what the circumferential paragraph 21 on the plug, which in the closed state on Edge 22 of the nozzle inlet rests.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Casting Devices For Molds (AREA)

Claims (5)

  1. Système d'arrivée pour installations de coulée continue d'aluminium, comprenant une goulotte, une buse d'amenée (2) intégrée dans la goulotte (1) et dans laquelle un bouchon (3) est inséré pour la régulation de l'afflux (4) de masse en fusion, et éventuellement un système de réglage par lequel la profondeur de pénétration du bouchon peut être commandée dans des limites préétablies,
    caractérisé par le fait
    que, sur la section transversale la plus étroite de la buse, le bouchon (3) est maintenu en permanence à distance de la paroi de la buse et il est réservé entre le bouchon et la paroi de la buse, également après la fermeture du bouchon (3), un espace intercalaire autorisant l'écoulement de la masse métallique en fusion subsistant dans ledit espace intercalaire ;
    que la section transversale de la buse se réduit continûment depuis l'entrée de la buse, environ jusqu'au centre de la buse, une différence angulaire mesurant 1°-3° entre le bouchon et la paroi latérale de l'espace annulaire D de la buse ;
    et qu'un bord obturateur, ménagé à l'extrémité du bouchon (3) voisine de l'entrée de la buse, obture l'entrée de la buse, par rapport à la masse en fusion, lors de l'enfoncement complet du bouchon (3).
  2. Système d'arrivée selon la revendication 1,
    caractérisé par le fait
    qu'une distance A d'au moins 7 cm est maintenue entre la section transversale la plus étroite de la buse, et l'entrée et la sortie de la buse.
  3. Système d'arrivée selon l'une des revendications précédentes,
    caractérisé par le fait
    que, à l'entrée de la buse, l'espace situé entre la buse (2) et le bouchon (3) est rétréci continûment sur une longueur B, la longueur du segment B étant comprise entre 0 et 10 cm.
  4. Système d'arrivée selon l'une des revendications précédentes,
    caractérisé par le fait
    que le rétrécissement intervient sur une longueur de 1-10 cm.
  5. Système d'arrivée selon l'une des revendications précédentes,
    caractérisé par le fait
    qu'un espace annulaire C, se rétrécissant, se forme au-dessus de la section transversale la plus étroite de la buse, entre la buse (2) et le bouchon (3), tandis que l'espace situé entre la buse (2) et le bouchon (3) est élargi continûment au-dessous de la section transversale la plus étroite de la buse, la pointe S du bouchon conservant vis-à-vis de la sortie Y de la buse, à l'état de fonctionnement, une distance minimale qui représente de 1 à 1,5 fois le diamètre de la pointe du bouchon, la pointe du bouchon étant de préférence arrondie selon un rayon de 5-10 mm.
EP95118107A 1995-02-08 1995-11-17 Système d'entrée pour une installation de coulée continue d'aluminium Expired - Lifetime EP0726113B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19504009 1995-02-08
DE19504009A DE19504009A1 (de) 1995-02-08 1995-02-08 Einlaufsystem für eine Aluminiumstranggußanlage

Publications (2)

Publication Number Publication Date
EP0726113A1 EP0726113A1 (fr) 1996-08-14
EP0726113B1 true EP0726113B1 (fr) 1998-02-04

Family

ID=7753378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95118107A Expired - Lifetime EP0726113B1 (fr) 1995-02-08 1995-11-17 Système d'entrée pour une installation de coulée continue d'aluminium

Country Status (6)

Country Link
EP (1) EP0726113B1 (fr)
AT (1) ATE162968T1 (fr)
DE (2) DE19504009A1 (fr)
ES (1) ES2115307T3 (fr)
NO (1) NO308201B1 (fr)
RU (1) RU2100137C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002000376A1 (fr) * 2000-06-23 2002-01-03 Vesuvius Crucible Company Buse de moulage en continu a modulateur de pression

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPQ284599A0 (en) * 1999-09-14 1999-10-07 Aluminium Pechiney A flow control assembly
AT412149B (de) * 2002-04-22 2004-10-25 Arc Leichtmetallkompetenzzentrum Ranshofen Gmbh Giesseinrichtung für leichtmetall

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1426136A (en) * 1922-04-18 1922-08-15 Jr William H Wills Nozzle
DE862350C (de) * 1942-10-24 1953-01-08 Vaw Ver Aluminium Werke Ag Vorrichtung zum gleichzeitigen Giessen einer Vielzahl von Bloecken
DE1614678U (de) * 1949-03-22 1950-10-12 Wilhelm Bremicker Ventileinrichtung an giesswagen fuer die chemisch-technische industrie.
GB1112819A (en) * 1964-12-03 1968-05-08 United Steel Companies Ltd Nozzle and stopper assemblies for the teeming of liquid metal
DE6606948U (de) * 1966-05-28 1970-12-10 United Steel Co Ltd Stopfenpfanne
NL7700977A (nl) * 1976-02-24 1977-08-26 Alusuisse Werkwijze en inrichting voor het continu gieten van een metaalsmelt in gietvormen.
DE4322316C1 (de) * 1993-07-05 1995-03-16 Vaw Ver Aluminium Werke Ag Einlaufsystem für eine Aluminiumstranggußanlage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002000376A1 (fr) * 2000-06-23 2002-01-03 Vesuvius Crucible Company Buse de moulage en continu a modulateur de pression
US6651899B2 (en) 2000-06-23 2003-11-25 Vesuvius Crucible Company Continuous casting nozzle with pressure modulator for improved liquid metal flow regulation
KR100819213B1 (ko) * 2000-06-23 2008-04-02 비수비우스 크루서블 컴패니 압력 모듈레이터가 있는 연속 주조용 노즐
CZ305080B6 (cs) * 2000-06-23 2015-04-29 Vesuvius Crucible Company Výlevka pro převádění proudění tekutého kovu pro kontinuální lití s modulací tlaku a způsob regulace proudění tekutiny

Also Published As

Publication number Publication date
NO308201B1 (no) 2000-08-14
ES2115307T3 (es) 1998-06-16
NO955349D0 (no) 1995-12-29
DE59501415D1 (de) 1998-03-12
RU2100137C1 (ru) 1997-12-27
DE19504009A1 (de) 1996-08-14
NO955349L (no) 1996-08-09
EP0726113A1 (fr) 1996-08-14
ATE162968T1 (de) 1998-02-15

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