EP0637477A2 - Système d'alimentation dans une machine de coulée continue d'aluminium - Google Patents

Système d'alimentation dans une machine de coulée continue d'aluminium Download PDF

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Publication number
EP0637477A2
EP0637477A2 EP94108061A EP94108061A EP0637477A2 EP 0637477 A2 EP0637477 A2 EP 0637477A2 EP 94108061 A EP94108061 A EP 94108061A EP 94108061 A EP94108061 A EP 94108061A EP 0637477 A2 EP0637477 A2 EP 0637477A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
inlet
stopper
section
channel
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
EP94108061A
Other languages
German (de)
English (en)
Other versions
EP0637477B1 (fr
EP0637477A3 (fr
Inventor
C.J. 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 EP0637477A2 publication Critical patent/EP0637477A2/fr
Publication of EP0637477A3 publication Critical patent/EP0637477A3/fr
Application granted granted Critical
Publication of EP0637477B1 publication Critical patent/EP0637477B1/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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • 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
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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

Definitions

  • the invention relates to inlet systems for continuous aluminum casting systems, consisting of a channel, an inlet nozzle inserted into the channel, into which a stopper for regulating the melt inlet is inserted, and optionally a control system with which the immersion depth of the stopper can be controlled within predetermined limits.
  • the static pressure also changes.
  • oxide and dirt particles are sucked into the melt from the metal surface of the trough or the ingot in the case of the negative pressures which then occur at the nozzle inlet or outlet, which has a disadvantageous effect on the ingot quality produced.
  • the object of the invention is therefore to optimize the inlet system in continuous aluminum casting systems in such a way that the negative pressure at the nozzle inlet and at the nozzle outlet is minimized while maintaining the essential installations and the flow conditions in the inlet nozzle are optimized.
  • a method for operating the inlet system is intended to reduce the vortex formation in the melt, so that no vortex formation occurs either on the melt surface in the channel or on the melt surface in the mold.
  • the nozzle contour according to the invention provides that the narrowest cross-section is present in the center of the inlet nozzle and thus the highest speed is generated in the center of the nozzle.
  • the shape of the nozzle avoids stalling, which could reduce the cross-section through which flow passes. The nozzle is thus flowed through uniformly over the entire cross-section, whereby an optimal volume flow can be set.
  • the inlet system consists of an inlet nozzle 2 inserted into the channel 1, into which a stopper 3 is inserted to regulate the melt inlet 4.
  • the melt reaches the mold 5 via the pouring nozzle, where it is formed into an ingot 6 which is held on the sprue 7.
  • the ingot 6 is pulled down out of the mold 5.
  • nozzles 2 and plugs 3 can be seen in FIG. 2. It can be seen that the cross sections X and Y at the nozzle inlet and nozzle outlet are large in relation to the other cross sections of the inlet nozzle, so that low flow velocities occur there.
  • FIG. 2 It can also be seen from FIG. 2 how the plug 3 dips into the nozzle 2.
  • the space remaining between the nozzle 2 and the plug 3 is to be regarded as an annular gap C and is designed such that the flow fills the entire cross section uniformly. Seen from the inlet side X, the annular gap C tapers, so that a dynamic pressure builds up in the flowing metal, which counteracts a reduction in the static pressure in the melt.
  • the cross section widens behind the narrowest point, for example in the middle of the nozzle, so that the flow is braked again without tearing.
  • the latter is drawn out at the tip to a radius of 11.5 mm in the example.
  • the pressure conditions are hardly changed by an increased level difference - in the example 26 cm and 34 cm.
  • the closely spaced curves for different level differences show that the flow conditions are very stable and the flow in the nozzle does not stop even at high negative pressures. It follows that the available cross section is flowed through relatively evenly and there are no speed peaks.
  • FIGS. 6a, b and 5a, b exemplarily show the pressure profiles of known inlet systems.
  • the negative pressure at the nozzle outlet can no longer be reduced, since the available cross section at the nozzle outlet is greatly reduced by the flow stall under the stopper. This creates high negative pressures at the nozzle outlet, which can no longer be compensated for by increasing the immersion depth of the nozzle (see FIG. 5a).
  • FIG. 4b shows a known inlet system that closes at the top.
  • the vacuum rises sharply with increasing level difference (see Figure 5b).
  • the consequence of this is that the metal column above the nozzle inlet in the channel and the associated static pressure are not sufficient to compensate for the negative pressure which arises at the nozzle inlet.
  • a stall occurs under the stopper, which reduces the available cross section. With a larger level difference, this stall can have an effect right up to the nozzle outlet, so that there an intensification of the vacuum occurs with the disadvantageous consequences mentioned at the beginning.
  • the pressure profiles used for the above considerations depend on the respective position of the measuring points.
  • the representations in FIGS. 5a, b are to be regarded as two-dimensional representations and therefore say nothing about the uniformity of the flow over the circumference of the inlet nozzle. As shown at the beginning, however, in the case of conventional inlet systems, irregularities can occur over the circumference of the inlet nozzle, resulting in speed peaks which in turn increase the negative pressure.
  • the volume flow can be metered in much more precisely and the occurrence of instabilities can be avoided.
  • the glass model showed that an optimized nozzle is also flowed through relatively evenly over the circumference.
  • the known inlet system tends to form turbulence. This is illustrated in FIG. 7 and is explained in more detail below.
  • the melt 4 arrives in the direction of the arrow through the channel 1 to the feed nozzle 2.
  • the negative pressure which arises at the nozzle inlet and outlet causes the melt surface to be dented by the air pressure, as a result of which the oxide layer can tear open and oxide or dirt particles can be sucked into the melt.
  • the non-deformable impurities are built into the solidification front. During the later rolling process, they come to the surface and lead to the tearing of the rolled strip or damage to the rolls.
  • a mechanical control of the mold casting system for aluminum ingots is shown schematically in FIG. Via a float 14, which is positioned on the metal surface of the ingot, the stopper 3 is moved up or down by means of a push rod 16 via a mechanical deflection 15.
  • the term "float” stands for a piece of refractory material that floats on the metal surface and reports the metal level using a lever.
  • the annular gap between the nozzle and the stopper is increased or decreased, depending on the direction in which the melt level deviates from the target value. The feed quantity of the molten metal is thus regulated by different plug heights.
  • the metal level in the mold 5 can fluctuate for various reasons. For example, the inclination of the melting furnace is not continuous, so that gushing occurs in the channel 1.
  • the metal level in the channel is also usually controlled with a float, so that two control systems are normally coupled to one another. This leads to a dynamic control behavior, which requires constant correction of the respective plug height during the casting phase.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Coating With Molten Metal (AREA)
EP94108061A 1993-07-05 1994-05-26 Système d'alimentation dans une machine de coulée continue d'aluminium Expired - Lifetime EP0637477B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4322316A DE4322316C1 (de) 1993-07-05 1993-07-05 Einlaufsystem für eine Aluminiumstranggußanlage
DE4322316 1993-07-05

Publications (3)

Publication Number Publication Date
EP0637477A2 true EP0637477A2 (fr) 1995-02-08
EP0637477A3 EP0637477A3 (fr) 1996-04-03
EP0637477B1 EP0637477B1 (fr) 1999-03-24

Family

ID=6491984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94108061A Expired - Lifetime EP0637477B1 (fr) 1993-07-05 1994-05-26 Système d'alimentation dans une machine de coulée continue d'aluminium

Country Status (16)

Country Link
US (1) US5490554A (fr)
EP (1) EP0637477B1 (fr)
KR (1) KR970005376B1 (fr)
AU (1) AU674749B2 (fr)
BR (1) BR9402624A (fr)
CA (1) CA2127321C (fr)
CZ (1) CZ285017B6 (fr)
DE (2) DE4322316C1 (fr)
ES (1) ES2133443T3 (fr)
HU (1) HU216124B (fr)
NO (1) NO300034B1 (fr)
PL (1) PL177723B1 (fr)
RU (1) RU2091193C1 (fr)
SK (1) SK78394A3 (fr)
TW (1) TW289002B (fr)
YU (1) YU41294A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726113A1 (fr) * 1995-02-08 1996-08-14 VAW Aluminium AG Système d'entrée pour une installation de coulée continue d'aluminium

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706151C2 (de) * 1997-02-18 2000-12-07 Sms Demag Ag Verfahren und Tauchrohr zum Metallstranggießen
KR100330352B1 (ko) * 1999-07-02 2002-04-01 유현식 내충격성이 우수한 신디오탁틱 폴리스티렌 수지 조성물
GB2352992B (en) * 1999-08-05 2002-01-09 Pyrotek Engineering Materials Distributor device
NL1014024C2 (nl) * 2000-01-06 2001-07-09 Corus Technology Bv Inrichting en werkwijze voor het continu of semi-continu gieten van aluminium.
US6989061B2 (en) * 2003-08-22 2006-01-24 Kastalon, Inc. Nozzle for use in rotational casting apparatus
US7041171B2 (en) * 2003-09-10 2006-05-09 Kastalon, Inc. Nozzle for use in rotational casting apparatus
US7270711B2 (en) * 2004-06-07 2007-09-18 Kastalon, Inc. Nozzle for use in rotational casting apparatus
JP5621737B2 (ja) * 2011-09-15 2014-11-12 新日鐵住金株式会社 連続鋳造における流量調整方法
WO2014164911A1 (fr) 2013-03-12 2014-10-09 Novelis Inc. Distribution de métal fondu intermittent
WO2017048523A1 (fr) * 2015-09-15 2017-03-23 Retech Systems Llc Capteur laser de contrôle de fusion de fours à sole et assimilés
WO2019099480A1 (fr) 2017-11-15 2019-05-23 Novelis Inc. Atténuation de dépassement ou de déficit de niveau de métal lors d'une transition de demande de débit
MX2022013756A (es) * 2020-05-07 2022-11-30 Novelis Inc Boquilla ranurada para fundicion con perno de control inferior.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB917565A (en) * 1960-05-13 1963-02-06 Didier Werke Ag Improvements relating to pouring nozzles for liquid metal
US4523624A (en) * 1981-10-22 1985-06-18 International Telephone And Telegraph Corporation Cast ingot position control process and apparatus
FR2639267B1 (fr) * 1988-11-23 1991-02-22 Clecim Sa Procede et ensemble d'alimentation en metal fondu de la lingotiere d'une installation de coulee continue d'ebauches minces
US5205343A (en) * 1989-06-03 1993-04-27 Sms Schloemann-Siemag Aktiengesellschaft Pouring tube for feeding molten steel into a continuous casting mold
US5339885A (en) * 1993-05-07 1994-08-23 Wagstaff Inc. Integrated non-contact molten metal level sensor and controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726113A1 (fr) * 1995-02-08 1996-08-14 VAW Aluminium AG Système d'entrée pour une installation de coulée continue d'aluminium

Also Published As

Publication number Publication date
DE4322316C1 (de) 1995-03-16
CA2127321A1 (fr) 1995-01-06
EP0637477B1 (fr) 1999-03-24
TW289002B (fr) 1996-10-21
CZ285017B6 (cs) 1999-05-12
SK78394A3 (en) 1995-09-13
AU6613294A (en) 1995-01-12
CZ160694A3 (en) 1997-05-14
NO941868D0 (no) 1994-05-19
PL303861A1 (en) 1995-01-09
BR9402624A (pt) 1995-04-04
HU9401732D0 (en) 1994-09-28
CA2127321C (fr) 1999-05-11
NO300034B1 (no) 1997-03-24
RU94024564A (ru) 1996-04-20
AU674749B2 (en) 1997-01-09
KR970005376B1 (ko) 1997-04-15
EP0637477A3 (fr) 1996-04-03
RU2091193C1 (ru) 1997-09-27
DE59407993D1 (de) 1999-04-29
HUT67850A (en) 1995-05-29
HU216124B (hu) 1999-04-28
ES2133443T3 (es) 1999-09-16
YU41294A (sh) 1996-10-09
PL177723B1 (pl) 2000-01-31
US5490554A (en) 1996-02-13
KR950002888A (ko) 1995-02-16
NO941868L (no) 1995-01-06

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