EP0005609B1 - Vorrichtung zum Abschirmen eines Giessstrahles - Google Patents

Vorrichtung zum Abschirmen eines Giessstrahles Download PDF

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Publication number
EP0005609B1
EP0005609B1 EP79300784A EP79300784A EP0005609B1 EP 0005609 B1 EP0005609 B1 EP 0005609B1 EP 79300784 A EP79300784 A EP 79300784A EP 79300784 A EP79300784 A EP 79300784A EP 0005609 B1 EP0005609 B1 EP 0005609B1
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EP
European Patent Office
Prior art keywords
cylinder
cylinders
ladle
pouring
carriage
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
Application number
EP79300784A
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English (en)
French (fr)
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EP0005609A1 (de
Inventor
Brian Poole
Philip John Young
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.)
Air Products and Chemicals Inc
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Air Products and Chemicals Inc
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Filing date
Publication date
Application filed by Air Products and Chemicals Inc filed Critical Air Products and Chemicals Inc
Publication of EP0005609A1 publication Critical patent/EP0005609A1/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
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • 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
    • B22D11/106—Shielding the molten jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing

Definitions

  • This invention relates to an apparatus for shielding molten metal during teeming.
  • FIG. 1 is a schematic perspective view of an installation for producing metal ingots.
  • the installation which is generally identified by reference numeral 1, comprises a pit 2, which is typically 24 m long, 3.6 m wide and 3.6 m deep.
  • a plurality of ingot moulds 3 to 10 are disposed in the pit 2 adjacent a plurality of pouring trumpets 11, 12 and 13.
  • a carriage 14 carrying a ladle 15 is arranged to move along the pit 2.
  • the bottom of the ladle 15 is provided with a pouring outlet (not shown).
  • ladle 15 is filled with molten metal and is loweed into position on carriage 14 by a crane. Carriage 14 is then moved along the pit until the pouring outlet is directly above one of the pouring trumpets.
  • a plug is then withdrawn upwardly from the pouring outlet and molten metal passes downwardly through the pouring trumpet and up inside the ingot moulds associated with the pouring trumpet.
  • the operation of pouring molten metal through the bottom of a ladle is known as teeming.
  • the carriage 14 is dispensed with and the ladle 15 is lowered onto the pouring trumpet and held in position during teeming by an overhead crane. This prevents the crane being used for other work during teeming.
  • a curtain of argon is formed around the molten metal stream by directing jets of argon downwardly from a toroidal nozzle supported around the pouring outlet. Although effective, this method consumes a substantial quantity of argon.
  • a tube is mounted on a pivoted lever and the lever can be raised to a position in which its upper end abuts the bottom of the ladle around the pouring spout.
  • a protective gas may be introduced into the tube.
  • the tube must be sufficiently long for its lower end to extend below the surface of the molten metal received in a tundish.
  • apparatus for shielding a stream of molten metal during teeming which apparatus comprises a first arm pivotably mounted on a carriage capable of carrying a ladle ; a second arm pivotably mounted on said carriage ; a first cylinder open at both ends connected to said first arm and having one end which, during teeming, is urged against the pouring outlet on the bottom of a ladle mounted on said carriage ; a second cylinder substantially axially aligned with said first cylinder, open at both ends, connected to said second arm, and moveable relative to said first cylinder to vary the total axial length of a passageway defined by said first and second cylinders, and means to introduce a shielding gas into the interior of said cylinders, the arrangement being such that, in use, after the pouring outlet of a ladle is arranged over a pouring trumpet, said arms can be moved so that the passageway defined by said first and second cylinders extends from the pouring outlet on the ladle to
  • means are provided to bias said first cylinder, in use, against the pouring outlet on said ladle.
  • Such means may conveniently comprise a counterweight mounted on said first arm.
  • said second cylinder is connected to said first cylinder by a flexible support.
  • a support may conveniently be defined by chain linking which is preferably of relatively small mesh, e.g. 0.65 mm, and is arranged to prevent molten metal splashes from interfering with said cylinder movement.
  • a seal for example an asbestos sleeve, can be mounted on the outside of said first and second cylinders to inhibit loss of shielding gas therebetween.
  • cylinder as used herein, embraces bodies of all cross-sections, e.g. rectangular, square and polygonal, although bodies of circular cross-section are preferred.
  • the end of the first cylinder, remote from the second cylinder may conveniently be provided with an inwardly extending lip which, with the inner surface of said first cylinder, defines a cavity opening towards said second cylinder, and wherein said means to introduce a shielding gas into the interior of said cylinders is arranged to introduce shielding gas into the interior of said cylinders via said cavity.
  • means are preferably provided so that the carriage is rendered immobile when one or both the first and second cylinders are in such a position that movement of the carriage could result in the cylinder(s) damaging the pouring trumpet(s).
  • FIG. 2 there is shown a carriage 20, which is mounted on rails 21, disposed to either side of a casting pit 52.
  • the carriage 20 is provided with trunnions (not shown) which support a ladle 22 having a pouring outlet 23.
  • a horizontal shaft 24 is mounted fast on the carriage 20 and acts as a pivot for a first bifurcated arm 25 and a second bifurcated arm 26.
  • a first cylinder 27 is mounted between the bifurcated ends of the first arm 25 and is biased against the pouring outlet 23 on the ladle 22 by counterweight 28.
  • a second cylinder 29 is mounted between the bifurcated ends of the second arm 26 by means of pivotably mounted links, one of which is identified by reference numeral 30.
  • First arm 25 is provided with a first control arm 31 and second arm 26 is provided with a second control arm 32.
  • an asbestos seal 33 is disposed around the outer surfaces of the first and second cylinders 27 and 29 respectively and inhibits argon escaping from inside the cylinders whilst permitting axial movement between the said cylinders.
  • a chain link shield 34 is secured to the bottom of first cylinder 27 and the bottom of the second cylinder 29.
  • the chain link shield 34 is funnel shaped and, in use, inhibits molten metal entering the space generally identified by reference numeral 35.
  • the first cylinder 27 comprises a pair of coaxial walls 36 and 37 which define an annular chamber 38 which communicates with an argon feed pipe 39.
  • the annular chamber 38 is sealed by a bottom flange 40 and an upper flange 41 which supports an asbestos sealing ring 42 and includes a lip 43 which defines, with the wall 37, a cavity 44.
  • Forty 6.25 mm diameter holes 45 are bored through the wall 37 where shown and allow argon to flow from argon feed pipe 39 to the inside of the first and second cylinders 27 and 29 via the annular chamber 38.
  • carriage 20 In use, carriage 20 is moved along rails 21 until the pouring outlet 23 on ladle 22 is directly above pouring trumpet 46. During this time counterweight 28 biases the seal 42 on first cylinder 27 against the bottom of the ladle 22 circumjacent the pouring outlet 23 and second cylinder 29 is held in a raised position by second control arm 32.
  • argon feed pipe 39 Once in position argon is introduced through argon feed pipe 39 and flows through pouring trumpet 46 and out of the ingot moulds thereby removing a substantial quantity of air from therein. Teeming is then commenced and the flow of argon is continued until teeming is complete. At the end of teeming the second cylinder 29 is raised to allow a sample of molten metal to be taken for analysis.
  • first control arm 31 can be raised thereby lowering first cylinder 27 sufficient for the insertion of an oxygen lance.
  • shielding gas Whilst argon is the preferred shielding gas it should be understood that other shielding gases may also be used, for example, in certain cases, nitrogen may be acceptable.
  • the present invention is particularly intended for use in casting ingots, it is also applicable to continuous casting wherein the molten metal is teemed into a tundish.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)

Claims (7)

1. Vorrichtung zur Abschirmung von geschmolzenem Metall während des Gießens mit einem ersten, drehbar an einem Wagen (20) angeordneten Arm (25), der eine Pfanne (22) trägt, einem zweiten, drehbar an dem Wagen (20) angeordneten Arm (26), einem an beiden Enden offenen, ersten Zylinder (27), der mit dem erstem Arm (25) verbunden ist und ein Ende aufweist, das während des Gießens gegen einen Gießauslaß (23) am Boden der auf dem Wagen (20) angeordneten Pfanne (22) gedrückt ist, einem gegenüber dem ersten Zylinder (27) in wesentlichen axial ausgerichteten, an beiden Enden offenen, zweiten Zylinder (29), der mit dem zweiten Arm (26) verbunden und gegenüber dem ersten Zylinder (27) bewegbar ist, um die gesamte Axiallänge des durch den ersten (27) und den zweiten (29) Zylinder definierten Durchlasses zu variieren, sowie einer Einrichtung (39), um ein Schutzgas dem Inneren der Zylinder zuzuführen, wobei die Anordnung so getroffen ist, daß im Betrieb, nachdem der Gießauslaß (23) über einem Gießtrichter (46) angeordnet ist, die Arme (25, 26) bewegt werden können, so daß der Durchlaß, der durch den ersten und zweiten Zylinder (27, 29) definiert wird, sich von dem Gießauslaß (23) an der Pfanne zu dem Gießtrichter (46) erstreckt und Schutzgas dem Durchlaß über die Einrichtung (39) zugeführt werden kann, um zu verhindern, daß Luft mit dem geschmolzenen Metall in Berührung kommt, wenn es durch den Durchlaß hindurchtritt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie eine Einrichtung (28) umfaßt, um den ersten Zylinder (27) im Betrieb gegen den Gießauslaß (23) an der Pfanne zu belasten.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der zweite Zylinder (29) über eine flexible Halterung (34) mit dem ersten Zylinder (27) verbunden ist.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die flexible Halterung (34) eine Kettenverbindung-umfaßt, die so angeordnet ist, daß Spritzer aus geschmolzenem Metall daran gehindert werden, die Zylinderbewegung zu beeinträchtigen.
5. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Dichtung (33) zwischen dem ersten und dem zweiten Zylinder (27, 29) aufweist, um einen Schutzgasverlust dazwischen zu verhindern.
6. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der erste Zylinder (27) mit einer sich einwärts erstreckenden Lippe (43) versehen ist, die mit der inneren Oberfläche des ersten Zylinders (27) einen Hohlraum (44) definiert. der sich zum zweiten Zylinder hin öffnet, wobei die Einrichtung zur Zufuhr des Schutzgases in das Innere der Zylinder so angeordnet ist, daß das Schutzgas in das Innere des Zylinder über den Hohlraum (44) zugeführt wird.
7. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß eine .Einrichtung vorgesehen ist, um den Wagen unbeweglich zu machen, wenn der erste und/oder der zweite Zylinder sich in einer solchen Position befinden bzw. befindet, daß die Bewegung des Wagens zu einer Beschädigung des (der) Gießtrichter durch den (die) Zylinder führen kann.
EP79300784A 1978-05-09 1979-05-08 Vorrichtung zum Abschirmen eines Giessstrahles Expired EP0005609B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB18382/78A GB1581201A (en) 1978-05-09 1978-05-09 Apparatus for shielding molten metal during teeming
GB1838278 1978-05-09

Publications (2)

Publication Number Publication Date
EP0005609A1 EP0005609A1 (de) 1979-11-28
EP0005609B1 true EP0005609B1 (de) 1981-05-27

Family

ID=10111507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79300784A Expired EP0005609B1 (de) 1978-05-09 1979-05-08 Vorrichtung zum Abschirmen eines Giessstrahles

Country Status (5)

Country Link
EP (1) EP0005609B1 (de)
CA (1) CA1135935A (de)
DE (1) DE2960386D1 (de)
GB (1) GB1581201A (de)
ZA (1) ZA792218B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342071C2 (de) * 1983-11-22 1986-08-07 Didier-Werke Ag, 6200 Wiesbaden Vorrichtung zum Abschirmen eines metallischen Gießstrahls
GB9615765D0 (en) * 1996-07-26 1996-09-04 Foseco Int Shrouding means
CN115401191B (zh) * 2022-09-05 2023-10-10 湖南省正德耐磨材料有限公司 一种高防护性铸造用浇包及其使用方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482621A (en) * 1965-11-22 1969-12-09 United Steel Co Ltd Apparatus for continuous casting of steel utilizing a closed chamber between a tundish and a reciprocatable mold
US3460725A (en) * 1967-03-23 1969-08-12 Schloemann Ag Apparatus for pouring molten metal
US3841385A (en) * 1972-03-01 1974-10-15 Allegheny Ludlum Ind Inc Method and apparatus for teeming stream protection

Also Published As

Publication number Publication date
CA1135935A (en) 1982-11-23
GB1581201A (en) 1980-12-10
ZA792218B (en) 1980-05-28
EP0005609A1 (de) 1979-11-28
DE2960386D1 (en) 1981-09-03

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