EP0637477B1 - 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
EP0637477B1
EP0637477B1 EP94108061A EP94108061A EP0637477B1 EP 0637477 B1 EP0637477 B1 EP 0637477B1 EP 94108061 A EP94108061 A EP 94108061A EP 94108061 A EP94108061 A EP 94108061A EP 0637477 B1 EP0637477 B1 EP 0637477B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
plug
inlet
section
supplying system
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
EP94108061A
Other languages
German (de)
English (en)
Other versions
EP0637477A2 (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 an inlet system for continuous aluminum casting plants, consisting of a gutter, one in gutter 1 used inlet nozzle 2, in which a plug 3 for regulation of the melt inlet 4 is inserted, the stopper 3 the narrowest cross section of the feed nozzle 2 is the melt feed closes and a control system with which the immersion depth the stopper is controllable within predetermined limits and a method for regulating an enema system.
  • the object of the invention is therefore in the enema system To optimize aluminum continuous casting plants so that under Maintaining the essential installations of negative pressure is minimized at the nozzle inlet and at the nozzle outlet and optimized the flow conditions in the inlet nozzle become.
  • a procedure for operating the enema system is said to reduce the vortex formation in the melt, so that both on the melt surface in the gutter as well no melt formation in the mold in the mold occur.
  • the nozzle contour according to the invention provides that in the The narrowest cross section is in the middle of the inlet nozzle and thus the highest speed in the middle of the nozzle is produced.
  • the nozzle shape prevents flow which could reduce the cross-section through which avoided.
  • the nozzle is thus evenly over the flows through the entire cross-section, resulting in a optimal volume flow can be set.
  • the inlet system consists of one in the channel 1 used inlet nozzle 2 into which a plug 3 for regulation of the melt inlet 4 is used.
  • a metal level H is formed above the inlet nozzle 2 in the Channel 1, which is preferably at least 5 cm.
  • the melt reaches the mold 5 via the pouring nozzle, where it is formed into an ingot 6, which is placed on the runner 7 is held.
  • a lowering device 9 the ingot 6 is down from the mold 5 pulled out.
  • nozzles 2 and plugs 3 are shown in FIG remove. It can be seen that the cross sections at the nozzle inlet (X) and nozzle outlet (Y) in relation to the other cross sections the inlet nozzle are chosen large, so that there are low Flow velocities occur.
  • the inlet nozzle according to the invention consists of two Cut A1, A2 from the narrowest cross section of the nozzle to the Nozzle entry or exit are measured.
  • section A2 In the upper part of the nozzle 2 (section A2) forms between Plug 3 and inner wall of the inlet nozzle from an annular space D, the narrows in the direction of flow.
  • the pressure ratios are also increased by an 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 with high negative pressure the flow in the nozzle does not stop. It follows that the available cross section is relatively even is flowed through and no speed peaks occur.
  • FIGS. 6a, b and 5a, b known inlet systems exemplified.
  • a downward closing inlet system according to FIG. 4a the vacuum at the nozzle outlet can no longer be reduced as the available cross section at the nozzle outlet very strong due to the stall under the stopper is reduced.
  • FIG. 4b shows a known upward closing inlet system shown.
  • the negative pressure increases increasing level difference strongly (see Figure 5b).
  • This has the consequence that the above the nozzle inlet in the Gutter standing metal column and the associated static Pressure is insufficient to reach the nozzle inlet to compensate for the resulting negative pressure.
  • Pressure curves depend on the position of the measuring points dependent.
  • the representations in Figure 5a, b are as look at 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, but can be uneven with conventional infeed systems keiten occur over the circumference of the inlet nozzle, whereby Speed peaks arise, which in turn create the negative pressure increase.
  • the volume flow can be dosed much more precisely and that Avoid occurrence of instabilities. It showed the glass model that an optimized nozzle also over the Flow is relatively even.
  • the known inlet system tends to Turbulence formation. This is shown in FIG. 7 and is explained in more detail below.
  • the melt 4 reaches the inlet nozzle in the direction of the arrow through the channel 1 2.
  • the resulting at the nozzle inlet and outlet The melt surface becomes underpressure from the air pressure dented, which can tear open the oxide layer and Oxide or dirt particles are sucked into the melt can.
  • the non-deformable impurities are in the solidification front installed. In the later rolling process they come to the surface and lead to tearing open of the rolled strip or damage to the rolls.
  • FIG 8 is a mechanical control of the mold casting system shown schematically for aluminum ingots. Via a float 14, which on the metal surface of the Barrens is positioned using a mechanical redirector 15 of the stopper 3 by means of a push rod 16 moved up or down.
  • the term "swimmer” is used for a piece of refractory material that is on the metal surface floats and the metal stand via a lever reports. In the present case, it becomes the annular gap between nozzle and stopper enlarged or reduced, each after which direction the melt level from the set point deviates. The feed rate of the molten metal is thus regulated by different plug heights.
  • the metal level in the mold 5 can be different Reasons fluctuate. For example, the inclination of the Melting furnace not continuously, so that gushing occurs in the channel 1. Even the metal stand in the gutter is usually regulated with a float, so that normally two control systems are coupled together are. This leads to a dynamic control behavior, that during the pouring phase of a constant correction of the each plug height required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Coating With Molten Metal (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (7)

  1. Système d'alimentation pour des installations de coulée continue d'aluminium, comprenant une goulotte, un tuyère d'alimentation (2), mise en place dans la goulotte (1), dans laquelle est mis en place un bouchon (3) pour réguler l'alimentation de fonte (4), ledit bouchon (3) obturant l'alimentation de fonte au niveau de la section la plus étroite de la tuyère d'alimentation (2), et comprenant un système de régulation au moyen duquel la profondeur de plongée du bouchon est susceptible d'être commandée à l'intérieur de limites prédéterminées,
    caractérisé en ce que
    depuis la section la plus étroite de la tuyère (2) jusqu'à l'entrée (X) et jusqu'à la sortie (Y) de la tuyère il existe une distance (A1, A2) d'au moins 7 cm, et
    à l'entrée de la tuyère, l'espace entre la tuyère (2) et le bouchon (3) se rétrécit sur une longueur (B) comprise entre 0 et 10 cm.
  2. Système d'alimentation selon la revendication 1,
    caractérisé en ce que
    le rétrécissement a lieu sur une longueur de 1 à 10 cm.
  3. Système d'alimentation selon l'une des revendications précédentes,
    caractérisé en ce que
    au-dessus de la section la plus étroite de la tuyère, il se forme entre la tuyère (2) et le bouchon (3) une chambre annulaire (D) qui va en se rétrécissant dans la direction de l'écoulement, tandis qu'au-dessous de la section la plus étroite de la tuyère, la chambre entre la tuyère (2) et le bouchon (3) va en s'élargissant sous un angle d'ouverture d'au moins 4°, la pointe du bouchon (S) étant arrondie avec un rayon de 10 à 14 mm.
  4. Système d'alimentation selon l'une des revendications précédentes,
    caractérisé en ce que
    les arêtes à l'entrée et à la sortie sont arrondies avec un rayon de 5 à 25 mm.
  5. Système d'alimentation selon l'une des revendications précédentes,
    caractérisé en ce que
    la chambre annulaire (D) est formée par une fente annulaire entre la tuyère (2) et le bouchon (3), les parois latérales formant la fente annulaire s'étendant pratiquement parallèlement.
  6. Système d'alimentation selon la revendication 5,
    caractérisé en ce que
    les parois latérales pratiquement parallèles de la chambre annulaire (D) vont en se rétrécissant dans la direction de l'écoulement avec une différence angulaire d'environ 1°.
  7. Procédé pour réguler un système alimentation pour des installations de coulée continue d'aluminium selon l'une des revendications 1 à 6,
    caractérisé en ce que
    on établit un niveau de métal (H) dans la goulotte (1) d'au moins 5 cm au-dessus de l'entrée (X) de la tuyère, et une profondeur de plongée (P) de la tuyère (2) d'au moins 2 cm.
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
DE4322316 1993-07-05
DE4322316A DE4322316C1 (de) 1993-07-05 1993-07-05 Einlaufsystem für eine Aluminiumstranggußanlage

Publications (3)

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

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19504009A1 (de) * 1995-02-08 1996-08-14 Vaw Ver Aluminium Werke Ag Einlaufsystem für eine Aluminiumstranggußanlage
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
NL1014024C2 (nl) * 2000-01-06 2001-07-09 Corus Technology Bv Inrichting en werkwijze voor het continu of semi-continu gieten van aluminium.
US7041171B2 (en) * 2003-09-10 2006-05-09 Kastalon, Inc. Nozzle for use in rotational casting apparatus
US6989061B2 (en) * 2003-08-22 2006-01-24 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
ES2684574T3 (es) 2013-03-12 2018-10-03 Novelis, Inc. Entrega intermitente de metal fundido
JP2018536085A (ja) * 2015-09-15 2018-12-06 リテック システムズ エルエルシー 炉式溶鉱炉などの溶融物制御のためのレーザセンサ
US10632528B2 (en) 2017-11-15 2020-04-28 Novelis Inc. Metal level overshoot or undershoot mitigation at transition of flow rate demand

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

Also Published As

Publication number Publication date
NO941868D0 (no) 1994-05-19
NO300034B1 (no) 1997-03-24
EP0637477A2 (fr) 1995-02-08
CA2127321C (fr) 1999-05-11
YU41294A (sh) 1996-10-09
KR950002888A (ko) 1995-02-16
HU216124B (hu) 1999-04-28
KR970005376B1 (ko) 1997-04-15
BR9402624A (pt) 1995-04-04
DE4322316C1 (de) 1995-03-16
HUT67850A (en) 1995-05-29
RU94024564A (ru) 1996-04-20
DE59407993D1 (de) 1999-04-29
PL177723B1 (pl) 2000-01-31
SK78394A3 (en) 1995-09-13
NO941868L (no) 1995-01-06
CZ160694A3 (en) 1997-05-14
CA2127321A1 (fr) 1995-01-06
TW289002B (fr) 1996-10-21
RU2091193C1 (ru) 1997-09-27
AU6613294A (en) 1995-01-12
CZ285017B6 (cs) 1999-05-12
AU674749B2 (en) 1997-01-09
EP0637477A3 (fr) 1996-04-03
HU9401732D0 (en) 1994-09-28
ES2133443T3 (es) 1999-09-16
US5490554A (en) 1996-02-13
PL303861A1 (en) 1995-01-09

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