EP0761343B1 - Verfahren und Vorrichtung zum Anfahren einer Giesswalzenstranggussanlage - Google Patents

Verfahren und Vorrichtung zum Anfahren einer Giesswalzenstranggussanlage Download PDF

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Publication number
EP0761343B1
EP0761343B1 EP96420255A EP96420255A EP0761343B1 EP 0761343 B1 EP0761343 B1 EP 0761343B1 EP 96420255 A EP96420255 A EP 96420255A EP 96420255 A EP96420255 A EP 96420255A EP 0761343 B1 EP0761343 B1 EP 0761343B1
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EP
European Patent Office
Prior art keywords
injector
tank
liquid metal
rolls
level
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
EP96420255A
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English (en)
French (fr)
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EP0761343A1 (de
Inventor
Pierre-Yves Mente
Marcel Cortes
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.)
Constellium Issoire SAS
Original Assignee
Pechiney Rhenalu SAS
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Publication of EP0761343A1 publication Critical patent/EP0761343A1/de
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels

Definitions

  • the invention relates to the field of continuous casting between cylinders (generally known in English as rollcasting) from aluminum and its alloys.
  • the invention relates more particularly the casting of thick aluminum or aluminum alloy strips less than or equal to 4.5 mm.
  • strips are then cold rolled to the final thickness which depends on the intended application. For example, a strip intended for the beverage can application will be cold rolled from the thickness 6/10 mm from the continuous casting machine up to approximately 0.3 mm.
  • the injectors can be used usually used in continuous casting between cylinders of thicker strips (6-10 mm). These injectors have very varied, with or without baffles and spacers and are generally made of refractory materials such as for example ceramic fibers.
  • a conventional injector is shown in fig. 3a.
  • An injector has an upper part (15) and a part lower (16) between which the liquid metal flows.
  • the injector has three zones: an upstream zone called tank (11) which receives the liquid metal from the furnace (31), a central zone (12) which may have a number of baffles and spacers and a zone end, cylinder side, which is usually designated by the lip term (13).
  • the applicant has demonstrated that, in the case particularly difficult of thin strip casting ( ⁇ 4.5 mm), it was advantageous to use a particular injector which includes the following characteristics: on the one hand the internal faces of the two lips (13) which are in contact with the liquid metal are parallel; on the other hand the injector is drawn in such a way that the distance which separates its upper part (15) and its lower part (16) in the central zone (12), distance which corresponds to the thickness of metal liquid when the casting machine is running, is significantly greater than the distance between the internal faces parallel of the two lips (13) at the end of the injector. It is created thus a metal charge which is very favorable for starting a casting thin strips ( ⁇ 4.5 mm) in the context of the invention.
  • FIG. 3b Such an injector is shown in FIG. 3b.
  • the tank (11) which receives the liquid metal from the oven and the distributed in the central area of the injector (12) may have a width less than the width of the central area of the injector (12). This is the case shown in fig. 4a. But in this case, "dead" areas in the flow of liquid metal which make more difficult to control the temperature of the liquid metal during the start-up period. For starting a thin strip casting ( ⁇ 4.5 mm), it is more advantageous to use a container whose width is equal to the width of the central area of the injector (fig. 4b). This bac may or may not be fitted with an electromagnetic stirrer intended for homogenize the temperature of the metal contained.
  • FIG. 5a represents a configuration where the injector is drawn in such a way so that the passage between the tank (11) and the central area (12) is completely free over the entire width of the injector.
  • the corresponding barrier (14) consists of a single piece plate across the entire width.
  • FIG. 5b represents a configuration where the passage between the tank (11) and the central area of the injector (12) is obstructed by a spacer forming an integral part of the injector. This spacer is pierced with several passage openings distributed over the entire width of the injector. To the right of each of the orifices, is finds a dam (14).
  • the materials used for this dam (s) are all materials usually used in aluminum casting such as refractory or poteyé steel.
  • Control of liquid metal temperatures all along the chain which goes from the oven to the cylinders is an essential point for a successful start-up.
  • the thermal inertia of the furnace or the presence of continuous treatment and / or filtration devices make it more difficult.
  • the conditions optimal for starting with regard to metal temperature liquid are significantly different from the plan conditions permanent and that the transition from the starting regime to the permanent regime time consuming which affects the productivity of the machine and the regularity of the quality of the tape. It is useful in this case to provide a reserve of extra liquid metal in an oven or a appendix pocket, maintained at a precise temperature. This liquid metal makes up for or adds to the liquid metal coming from the oven during the start-up period.
  • the sensor (21) can be inductive or capacitive or laser.
  • the actuator (23) can be a stopper or hatch actuator. The plaintiff however highlighted that it was particularly advantageous to use for starting a casting of thin strips ( ⁇ 4.5 mm) a capacitive sensor which has the advantage of having a quick response.
  • the law of evolution of the level given as instructions to the regulator (23) is in a simplified version of the invention a law predetermined by previous experiments and simply a function of time. It is also possible to give the regulator (23) as a rule a law level dependent on casting speed and not on time. It is finally possible to adopt a mixed solution where the level law is a pre-established law as a function of time, possibly corrected by the speed measurement when it deviates from a given range.
  • the law of displacement of the injector support given as instruction to regulator (44) is in a simplified version of the invention a law preestablished by prior experiments and simply a function of time. It is also possible to give the regulator (44) as logs a law of displacement of the injector support depending on measuring cylinder tightness or a dependent displacement law an in situ measurement of the position of the injector. It is possible finally to adopt mixed solutions where the law of displacement is a pre-established law and function of time, possibly corrected by the measuring cylinder tightness and / or measuring the position of the injector when these parameters deviate from a given range. The goal of this permanent adjustment of the injector position is to keep the distance between the lips and the cylinders and to align the central plane of the injector with the casting plane (53) equidistant from the two cylinders.
  • the precise movement of the injector support which allows to adjust the positioning thereof is ensured by any conventional means in mechanical taking into account the desired precision and the environment particular of an aluminum casting.
  • stepper motors fit perfectly.
  • the method and the starting device according to the invention find their full efficiency when all operations are automated, thus avoiding the risk of human failure. But we can also use the process according to the invention while maintaining interventions manual, such as the opening of the dam (s).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Control Of Metal Rolling (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (5)

  1. Verfahren zum Anfahren einer Gießwalzenbandgiessanlage zur Herstellung von Bändern aus Aluminium oder Aluminiumlegierungen in einer Dicke bis zu 4,5 mm, das folgende Schritte umfasst:
    Anbringung eines Gießspiegelmesssystems (21) in dem Tiegel (11), die das Zentrum der Zuführungsdüse (12) befüllt
    Anbringung einer oder mehrerer Sperrklappe(n) (14) zwischen dem Tiegel (11) und dem Zentrum der Zuführungsdüse (12)
    Vorheizen des Tiegels (11) und des Zentrums der Zuführungsdüse (12)
    Vorheizen der Gießwalzen (51) der Bandgiessanlage
    Einschalten der Rotation der Gießwalzen (51)
    Einschalten der Flüssigmetallzufuhr
    Öffnen der Sperrklappe(n) (14), sobald das Flüssigmetall einen bestimmten Füllstand im Tiegel (11) erreicht
    Regulierung des Flüssigmetallspiegels im Tiegel (11)
    Berichtigung der Stellung der Zuführungsdüsen,
       dadurch gekennzeichnet, dass in der Anfahrphase der festgelegte Regelungswert des Flüssigmetallspiegels und der festgelegte Wert für die Verschiebung der Zuführungsdüsen zeitabhängig festgelegte Einstellungen sind, damit der Abstand zwischen dem Schnabel (13) der Zuführungsdüsen und den Gießwalzen (51) konstant gehalten wird.
  2. Verfahren zum Anfahren einer Gießwalzenbandgiessanlage zur Herstellung von Bändern aus Aluminium oder Aluminiumlegierungen in einer Dicke bis zu 4,5 mm, das folgende Schritte umfasst:
    Anbringung eines Gießspiegelmesssystems (21) in dem Tiegel (11) zur Befüllung des Zentrums der Zuführungsdüse (12)
    Anbringungen einer oder mehrerer Sperrklappe(n) (14) zwischen dem Tiegel (11) und dem Zentrum der Zuführungsdüse (12)
    Vorheizen des Tiegels (11) und des Zentrums der Zuführungsdüsen (12)
    Vorheizen der Gießwalzen (51) der Bandgiessanlage
    Einschalten der Rotation der Gießwalzen (51)
    Einschalten der Flüssigmetallzufuhr
    Öffnen der Sperrklappe(n) (14), sobald das Flüssigmetall einen bestimmten Füllstand im Tiegel (11) erreicht
    Regulierung des Flüssigmetallspiegels im Tiegel (11)
    Berichtigung der Stellung deer Zuführungsdüsen,
       dadurch gekennzeichnet, dass während der Anfahrphase der festgelegte Regelwert für den Gießspiegel des Flüssigmetalls eine zeitabhängige voreingestellte Einstellung ist, und dass, um den Abstand zwischen dem Kokillenschnabel (13) und den Gießwalzen (51) konstant zu halten, das Verschieben der durchgängigen Kokille durch einen Regler gesteuert wird, der diese Distanz mit einer in-situ-Abstandsmessung zwischen dem Kokillenschnabel und den Gießwalzen im Bereich von 0,1 bis 0,5 mm hält.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die verschiedenen Sequenzen vollautomatisch ausgelöst werden.
  4. Vorrichtung für die Flüssigmetallbeschickung einer Gießwalzenbandgiessanlage zur Herstellung von Bändern aus Aluminium oder Aluminiumlegierungen in einer Dicke bis zu 4,5 mm bestehend aus:
    einer Tiegel/Zuführungsdüsen-Einheit (11, 12, 13), die dazu bestimmt ist, das Flüssigmetall zwischen den Gießwalzen zuzuführen
    einer oder mehreren beweglichen Sperrklappen (14), mit denen der Durchfluss des Flüssigmetalls zwischen dem Tiegel (11) und dem Zentrum der Zuführungsdüsen (12) verhindert und dann geöffnet werden kann
    einem Gießspiegelmesssystem (21) im Tiegel (11)
    einem Wirkglied (22), das auf die Kippvorrichtung des Giessofens oder auf die mehr oder weniger große Öffnung des Ofenaustritts wirkt
    einem ersten Regler (23) mit einem festgelegten Gießspiegelwert als Stellwert, der diesen Stellwert mit dem tatsächlichen, vom Gießspiegelmesssystem ermittelten Wert vergleicht, und der dann das Wirkglied (22) betätigt, damit der festgelegte Füllstandswert eingehalten wird
    einem Zuführungsdüsengestell (41), das horizontal auf der Gießachse und vertikal senkrecht zu dieser Achse verfahren kann und mit Stellungssensoren (42) bestückt ist
    einem zweiten Regler (44) mit einem festgelegten Verschiebewert als Stellwert, der diesen Stellwert mit der tatsächlichen, vom Stellungssensor (42) ermittelten Stellung vergleicht und dementsprechend das Verschieben des Zuführungsdüsengestells (41) bewirkt, so dass der Stellwert eingehalten wird
       dadurch gekennzeichnet, dass die Zuführungsdüse:
    an dem walzenseitigen Ende einen Schnabel (13) aufweist, dessen flüssigmetallberührte Innenseiten parallel sind
    eine Form aufweist, bei der der Abstand zwischen dem oberen Teil (15) und dem unteren Teil (16) ihres Zentrums (12) um das 1,5 bis 5-fache größer ist als der Abstand, der zwischen den beiden Schnabelhälften (13) besteht.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Gießspiegelmesssystem (21) des Flüssigmetalls im Tiegel (11) ein kapazitives Messsystem ist.
EP96420255A 1995-08-03 1996-07-25 Verfahren und Vorrichtung zum Anfahren einer Giesswalzenstranggussanlage Expired - Lifetime EP0761343B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509645 1995-08-03
FR9509645A FR2737430B1 (fr) 1995-08-03 1995-08-03 Procede et dispositif de demarrage d'une machine de coulee continue entre cylindres

Publications (2)

Publication Number Publication Date
EP0761343A1 EP0761343A1 (de) 1997-03-12
EP0761343B1 true EP0761343B1 (de) 2002-02-27

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EP96420255A Expired - Lifetime EP0761343B1 (de) 1995-08-03 1996-07-25 Verfahren und Vorrichtung zum Anfahren einer Giesswalzenstranggussanlage

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EP (1) EP0761343B1 (de)
JP (1) JP3047162B2 (de)
KR (1) KR100301692B1 (de)
AT (1) ATE213676T1 (de)
BR (1) BR9603259A (de)
CZ (1) CZ230096A3 (de)
DE (1) DE69619445T2 (de)
ES (1) ES2172647T3 (de)
FR (1) FR2737430B1 (de)
NO (1) NO963204L (de)
RU (1) RU2153406C2 (de)
TW (1) TW317517B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO591697A0 (en) * 1997-03-27 1997-04-24 Bhp Steel (Jla) Pty Limited Casting metal strip
AU9034098A (en) * 1997-08-27 1999-03-16 Kaiser Aluminum & Chemical Corporation Apparatus for adjusting the gap in a strip caster
FR2774930B1 (fr) * 1998-02-13 2000-05-19 Pechiney Rhenalu Bandes en alliage d'aluminium a grande homogeneite de surface et procede de fabrication de ces bandes
FR2775916B1 (fr) * 1998-03-13 2000-06-23 Pechiney Rhenalu Procede et dispositif de controle du profil d'epaisseur d'une bande metallique mince obtenue par coulee continue entre moules mobiles
KR100957038B1 (ko) 2007-12-21 2010-05-13 한국기계연구원 판재 연속 주조장치
DE102015114725B3 (de) * 2015-09-03 2016-12-08 Salzgitter Flachstahl Gmbh Schmelzenaufgabesystem für eine horizontale Bandgießanlage
CN108480577A (zh) * 2018-03-13 2018-09-04 闻喜县远华冶金材料有限公司 铸轧镁合金型材的生产方法
WO2023192797A1 (en) * 2022-03-30 2023-10-05 Novelis Inc. Automatic dam positioning systems and methods for controlling molten metal distribution to continuous casters

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL235564A (de) * 1958-01-31
US3405757A (en) * 1967-04-12 1968-10-15 Harvey Aluminum Inc Method and apparatus for continuous casting of metal between oppositely rotatable cooling rolls set generally one above the other
FR2398565A1 (fr) * 1977-07-27 1979-02-23 Scal Gp Condit Aluminium Busette d'alimentation en metal liquide pour machine de coulee continue de bande
US4550767A (en) * 1984-04-09 1985-11-05 Aluminum Company Of America Roll caster apparatus having uniform flow of molten metal into novel nozzle tip assembly
CH688507A5 (de) * 1990-02-19 1997-10-31 Pechiney Rhenalu Metallschmelzezufuehrung in einer Bandgiessvorrichtung.
US5238049A (en) * 1992-10-06 1993-08-24 Reynolds Metals Company Adjustable flow control device for continuous casting of metal strip
US5343932A (en) * 1993-04-26 1994-09-06 Reynolds Metals Company System for feeding molten metal stream to continuous strand caster

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Publication number Publication date
CZ230096A3 (en) 1997-02-12
FR2737430A1 (fr) 1997-02-07
FR2737430B1 (fr) 1997-09-05
JPH09103851A (ja) 1997-04-22
DE69619445T2 (de) 2002-10-24
JP3047162B2 (ja) 2000-05-29
TW317517B (de) 1997-10-11
KR100301692B1 (ko) 2001-11-22
RU2153406C2 (ru) 2000-07-27
EP0761343A1 (de) 1997-03-12
ATE213676T1 (de) 2002-03-15
DE69619445D1 (de) 2002-04-04
NO963204D0 (no) 1996-07-31
NO963204L (no) 1997-02-04
ES2172647T3 (es) 2002-10-01
BR9603259A (pt) 1998-04-28

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