EP0048641B2 - Vorrichtung zum Schützen geschmolzenen Metalls in Schieberverschlüssen - Google Patents

Vorrichtung zum Schützen geschmolzenen Metalls in Schieberverschlüssen Download PDF

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Publication number
EP0048641B2
EP0048641B2 EP81401315A EP81401315A EP0048641B2 EP 0048641 B2 EP0048641 B2 EP 0048641B2 EP 81401315 A EP81401315 A EP 81401315A EP 81401315 A EP81401315 A EP 81401315A EP 0048641 B2 EP0048641 B2 EP 0048641B2
Authority
EP
European Patent Office
Prior art keywords
gas
metal
nozzle
distribution means
inert gas
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
EP81401315A
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English (en)
French (fr)
Other versions
EP0048641B1 (de
EP0048641A1 (de
Inventor
Albert-Gilbert Goursat
Thierry Hersant
Jacques Nicolas
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9245923&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0048641(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority to AT81401315T priority Critical patent/ATE10915T1/de
Publication of EP0048641A1 publication Critical patent/EP0048641A1/de
Publication of EP0048641B1 publication Critical patent/EP0048641B1/de
Application granted granted Critical
Publication of EP0048641B2 publication Critical patent/EP0048641B2/de
Expired 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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection

Definitions

  • the invention relates to the protection of the pouring jet of a molten metal contained in a container and passing through a plate shutter device comprising a fixed plate and a movable plate provided with at least one nozzle.
  • shutter devices control the opening and closing of the container, pocket or distributor tap hole, the nozzle being able to come into communication with said tap hole. They therefore make it possible to pour the molten metal, for example steel, into an ingot mold or the like.
  • the molten metal can be poured directly from the ladle into the mold or, in the continuous casting box, from the ladle into a distributor and then into the mold.
  • the two plates are made of a material resistant to high temperatures such as ceramic or impregnated or tarred alumina.
  • the movable plate can be sliding or rotary and be provided with a single nozzle or with several nozzles of different internal diameters. In the latter case, it is possible, by changing the nozzle, to modify the casting speed as a function, for example, of the height of the metal in the container.
  • the two plates can be applied against each other by means of a spring system provided with a cooling circuit.
  • the currently known shutter devices have numerous passage locations for atmospheric air which is truly sucked in as a result of the depression caused by the flow of molten metal. These shutters increase the risk of occlusion of air bubbles in the metal during casting and therefore the risk of oxidation.
  • the places through which air penetrates to the metal are: the gap between the two opposite faces of the fixed and movable plates due to the play necessary for their relative movement; the connection zone between the nozzle (s) and the movable plate, in particular when the said nozzle (s) are removably mounted on the said plate; the outlet end of the nozzle; the connection between the fixed plate and the container as well as, in the case of nozzles permanently mounted on the movable plate, the connection between said nozzle and said plate, these connections being made by masonry using a cement grout inherently not gas tight and which becomes more and more porous due to the cracks which appear with use.
  • This device which is a shutter device of the type comprising a fixed plate and a sliding plate provided with a pouring nozzle, comprises a reservoir of neutral gas which surrounds the lower part of said nozzle.
  • the supply of neutral gas at the base of the pouring nozzle ensures the protection of the molten metal after it leaves said nozzle.
  • This device has the drawback of not ensuring the protection of the jet of molten metal during its passage through the plate closure member; thus, during this crossing, the metal jet is exposed to the oxidizing action of the air which infiltrates between the plates or between the nozzle and the movable plate.
  • the present invention aims to eliminate the aforementioned drawbacks and proposes, for this purpose, a plate shutter device of the type comprising a fixed plate, a movable plate provided with a nozzle at least capable of coming into communication with the tap hole. , and gas supply and distribution means connected to a source of gas which is paratially inert with respect to the metal.
  • the abovementioned supply and distribution members comprise at least one circular groove (111), (122) hollowed out on at least one of the faces (11a, 12a) in mutual contact with the plates (11, 12), these grooves surrounding, over their entire periphery, the orifices (110, 120) through which said plates pass, the pressure of the inert gas is adjusted by means of pressure reducing means (21), so as to obtain, in the gas supply and distribution members (111, 122), an overpressure of a few millimeters of water relative to the local atmospheric pressure, the flow of the metal through the plate shutter device creating, by effect of suction of inert gas, at a pressure slightly higher than atmospheric pressure, a continuous gaseous protective barrier which envelops the metal and isolates it from the ambient air.
  • the introduction into the shutter device of a gas that is practically inert with respect to the metal, a gas which is delivered by the gas source at a pressure slightly higher than atmospheric pressure , and the distribution of this gas around the metal as it passes through said device makes it possible to isolate it from the ambient air by a continuous gaseous protection barrier.
  • a continuous gaseous protection barrier prevents the passage of ambient air and therefore its oxidizing action.
  • this gas barrier being constituted by a gas that is practically inert with respect to the treated metal, that is to say devoid of chemical action on this metal, or at least of which the chemical action, if it exists , can be neglected, does not entail any risk of harming the quality of the final product.
  • the movable plate further comprises a channel communicating with the groove or grooves and opening into the junction zone between the movable plate and the nozzle.
  • the abovementioned supply and distribution members comprise an annular porous ring disposed in the vicinity of the outlet orifice of the nozzle and supplied with gas in the gas phase.
  • the abovementioned supply and distribution members comprise an annular flange disposed in the vicinity of the outlet orifice of the nozzle and supplied with gas in the liquid phase.
  • the abovementioned supply and distribution members may comprise at least one recess formed in at least one of the aforementioned plates and communicating with the gap between the faces in mutual contact of said plates.
  • This recess connected to the aforementioned source, therefore encloses a reserve of inert gas under pressure which penetrates into the aforementioned interstice and effectively prevents the penetration of ambient air by said interstice.
  • a metal container 1 for example a ladle, consisting of an external metal breastplate 2 and an internal coating 3 of refractory material, has a bottom wall provided with an interchangeable socket 5, also made of refractory material, in which the taphole 6 is formed.
  • a taphole shutter device 6 according to the invention and designated generally by reference 10.
  • the device 10 essentially comprises a fixed plate 11 and a movable plate 12 applied one against the other along their face 11a and 12a respectively by a spring system not shown, the movable plate 12 being mounted rotatably about an axis XX 'and carrying two nozzles 13, these nozzles being made, like the plates 11 and 12, of a refractory material, for example an impregnated alumina.
  • the plate 11 is crossed by an orifice 110, placed in alignment with the tap hole 6, while the movable plate 12 is crossed by two passages such as 120 (only one is shown).
  • Each nozzle 13, crossed by an internal channel 130 (only one is shown), is provided with a metal external armor 131 and permanently mounted on the plate 12 by means of said armor 131 and a metal support 121 integral with said plate, so that its channel 130 is in alignment with the passage 120.
  • By rotation of the plate 12 one therefore brings one or the other of the nozzles 13 (the left nozzle in FIG. 1) in communication with the tap hole 6.
  • the plate 11 is provided with a recess constituted by a circular groove 111 hollowed out on its face 11a, concentrically with the orifice 110, and consequently communicating with the gap 11a-12a between the two plates.
  • Two perpendicular conduits communicating with each other, 112 and 113, are drilled in the mass of the plate 11.
  • the conduit 113 opens directly into the groove 11 while the conduit 112 is connected, by means of a tube 14, to a pressurized inert gas source 20, provided with a detector 21.
  • the inert gas can be nitrogen, argon, a nitrogen-argon mixture or in the case of aluminum metallurgy for example , of C0 2 .
  • the groove 111 as well as the conduits 112 and 113 therefore constitute organs for supplying and distributing the gas delivered by the source 20, this gas forming, between the two plates 11 and 12 and around the channel formed by the orifices 6, 110 , 120 and 130, a gas barrier that prevents ambient air from reaching the flowing metal.
  • the movable plate 12 which is provided with a recess constituted by a circular groove 122 hollowed out on its face 12a concentrically with passage 120 and thereby communicating with the gap 11a-12a.
  • Two perpendicular conduits and communicating with each other 123 and 124 are drilled in the mass of the plate 12.
  • the conduit 124 opens directly into the groove 122 while the conduit 123 is connected, via a tubular 125, to the source 20.
  • each of these passages may be provided with a groove such as 122, or a single groove may be provided surrounding all of the passages .
  • the nozzle 14, the central channel of which is designated by 140, is, unlike the nozzles 13 in FIG. 1, removably mounted on the plate 12, this thanks to an appropriate system of known type, for example with bayonet.
  • the breastplate 141 of the nozzle 14 and the ring 142 carried on the support 121 are provided with latching means (not shown) which allow the nozzle to be held on the plate.
  • a channel 126 is drilled in the plate 12 perpendicular to the conduit 123 and communicating with the latter, this channel 126 opening into the zone of 127 junction between nozzle and plate.
  • the inert gas fills the zone 127 thus creating a protective barrier around the flowing metal.
  • the pressure of the inert gas is adjusted by means of the pressure reducer 21, so as to obtain in the grooves 111 or 122, an overpressure of a few millimeters of water relative to the local atmospheric pressure.
  • a gaseous protective barrier is also created at the lower end of the nozzle 14, that is to say at the outlet of the jet of liquid metal.
  • the inert gas supply and distribution members comprise, in this case, an annular distributor constituted by a porous ring of refractory material 144 housed in a recess 145 formed at the outlet of the nozzle 14, this ring being connected, by a tubing 146, at source 20.
  • the flow of inert gas from the ring 144 makes it possible to compensate for the depression caused by the emergence at high speed of the metal jet and prevents atmospheric air from reaching said metal.
  • FIG. 3 A first alternative embodiment of the gaseous protective barrier at the outlet opening of the nozzle is shown in Figures 3 and 4.
  • the nozzle 15, provided with a central channel 150 and a breastplate 151 comprises, at its lower part, an annular groove 152 into which tangentially opens a tube 153 connected to a source of inert gas under pressure (not shown).
  • the refractory material has a smaller thickness, thus providing a channel 154 extending the channel 150 but having a larger diameter.
  • the nozzle 16 provided with a central channel 160 and a breastplate 161 , comprises, at its lower part, a distributor constituted by a metallic flange 162 in the form of a trough that is extended, in the direction of the outlet end of said nozzle, a sleeve also metallic 163 which forms a coating on the breastplate 161, the nozzle being deprived, in this part, of refractory material.
  • a distributor constituted by a metallic flange 162 in the form of a trough that is extended, in the direction of the outlet end of said nozzle, a sleeve also metallic 163 which forms a coating on the breastplate 161, the nozzle being deprived, in this part, of refractory material.
  • a tube 164 connected to a source of inert gas in liquefied form (not shown) and delivering said gas in the liquid phase.
  • flange 162 and the sleeve 163 are metallic, for example made of mild steel, has the consequence of facilitating the transmission of calories from the metal jet and consequently of accelerating the passage from liquid phase to gas phase, the latter forming the desired protective barrier.
  • the flow rate of the liquefied gas can be adjusted so that only a part is vaporized in the flange 162.
  • the excess liquid phase then flows along the jet of metal and spreads over the surface of the bath, forming a protective liquid layer.
  • the grooves 111 and 122 of the fixed plate 11 and the movable plate 12 could have a shape other than circular, for example elliptical.
  • the groove 152 and in the collar 162 of the nozzles 15 and 16 respectively could tangentially open several pipes such as 153 and 164 instead of just one.

Landscapes

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

Claims (5)

1. Verschlußvorrichtung mit Schiebern (10) für ein Stichloch (6) eines geschmolzenes Metall enthaltenden Behälters (1), mit einem festen Schieber (11), einem beweglichen Schieber (12), der mit mindestens einem Gießrohr (13), (14), (15), (16), versehen ist, die mit dem Stichloch (6) in Verbindung gebracht werden können und mit Gaszuführ- und Gasverteilungsorganen (111, 122), die mit einer Quelle (20) für dem Metall gegenüber praktisch inertes Gas verbunden sind, dadurch gekennzeichnet, daß die genannten Zuführ- und Verteilungsorgane mindestens eine kreisförmige Auskehlung (111), (122) aufweisen, die in mindestens eine der in gegenseitiger Berührung stehenden Flächen (11 a, 12a) der Schieber (11, 12) eingetieft ist, wobei diese Auskehlungen auf der Gesamtheit Ihres Umfanges dies Öffnungen (110, 120) umgeben, welche durch diese Schieber hindurchgehen, und wobei der Druck des Inertgases mit Hilfe eines Druckminderers (21) so geregelt wird, daß sich in den Gaszuführ-und Verteilungsorganen (111, 122) ein Überdruck von einigen Millimetern Wassersäule in bezug auf den örtlichen atmosphärischen Druck einstellt, und der Metallstrom durch die Schieberverschlußvorrichtung durch Ansaugen von Inertgas mit einem leicht über dem atmosphärischen Druck liegenden Druck eine kontinuierliche, gasförmige, schützende Sperre erzeugt, die das Metall umhüllt und es von der Umgebungsluft isoliert.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der bewegliche Schieber ferner einen Kanal (126) aufweist, der mit der Auskehlung (122) in Verbindung steht und in der Verbindungszone (127) zwischen dem beweglichen Schieber (12) und dem Gießrohr (14) mündet.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zuführ- und Verteilungsorgane einen porösen Ring (144) aufweisen, der in der Nachbarschaft der Austrittsöffnung des Gießrohres (14) angeordnet und mit Gas in Gasphase versorgt ist.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zuführ- und Verteilungsorgane einen Ringkragen (162) aufweisen, der in der Nachbarschaft der Austrittsöffnung des Gießrohres (16) angeordnet und mit Gas in flüssiger Phase versorgt ist.
5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß sie außerdem Mittel zur Einstellung des Durchflusses des Inertgases enthält, die den porösen Ring (144) so mit Inertgas versorgen, daß der Zustrom von Inertgas mit einer Geschwindigkeit gleich derjenigen des flüssigen Metalls erfolgt.
EP81401315A 1980-09-15 1981-08-18 Vorrichtung zum Schützen geschmolzenen Metalls in Schieberverschlüssen Expired EP0048641B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401315T ATE10915T1 (de) 1980-09-15 1981-08-18 Vorrichtung zum schuetzen geschmolzenen metalls in schieberverschluessen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8019837A FR2490123A1 (fr) 1980-09-15 1980-09-15 Dispositif obturateur a plaques pour trous de coulee de recipient contenant un metal en fusion
FR8019837 1980-09-15

Publications (3)

Publication Number Publication Date
EP0048641A1 EP0048641A1 (de) 1982-03-31
EP0048641B1 EP0048641B1 (de) 1984-12-27
EP0048641B2 true EP0048641B2 (de) 1989-09-20

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ID=9245923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401315A Expired EP0048641B2 (de) 1980-09-15 1981-08-18 Vorrichtung zum Schützen geschmolzenen Metalls in Schieberverschlüssen

Country Status (10)

Country Link
US (1) US4480770A (de)
EP (1) EP0048641B2 (de)
JP (1) JPS5752564A (de)
AR (1) AR225364A1 (de)
AT (1) ATE10915T1 (de)
AU (1) AU543563B2 (de)
CA (1) CA1186146A (de)
DE (1) DE3167942D1 (de)
FR (1) FR2490123A1 (de)
ZA (1) ZA815454B (de)

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FR2530167A1 (fr) * 1982-07-13 1984-01-20 Air Liquide Procede et installation de protection d'un jet de coulee de metal liquide
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KR20090077943A (ko) * 2006-11-08 2009-07-16 스토핑크 아크티엔게젤샤프트 로킹 유닛 및 보호 캡을 포함하는 비철금속 용융 금속용 컨테이너 장치
KR101541138B1 (ko) 2008-12-16 2015-08-03 주식회사 동진쎄미켐 액정 화합물 및 그 제조방법
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Also Published As

Publication number Publication date
DE3167942D1 (en) 1985-02-07
US4480770A (en) 1984-11-06
FR2490123A1 (fr) 1982-03-19
EP0048641B1 (de) 1984-12-27
JPS5752564A (en) 1982-03-29
ZA815454B (en) 1982-07-28
ATE10915T1 (de) 1985-01-15
AR225364A1 (es) 1982-03-15
CA1186146A (fr) 1985-04-30
FR2490123B1 (de) 1983-12-09
AU543563B2 (en) 1985-04-26
AU7389881A (en) 1982-03-25
EP0048641A1 (de) 1982-03-31

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