EP0213042B1 - Vorrichtung zum Schutz eines flüssigen Giesstrahls gegen Oxydation und/oder Nitrierung - Google Patents

Vorrichtung zum Schutz eines flüssigen Giesstrahls gegen Oxydation und/oder Nitrierung Download PDF

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Publication number
EP0213042B1
EP0213042B1 EP86401792A EP86401792A EP0213042B1 EP 0213042 B1 EP0213042 B1 EP 0213042B1 EP 86401792 A EP86401792 A EP 86401792A EP 86401792 A EP86401792 A EP 86401792A EP 0213042 B1 EP0213042 B1 EP 0213042B1
Authority
EP
European Patent Office
Prior art keywords
shell
shells
distributor
casting
jet
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
EP86401792A
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English (en)
French (fr)
Other versions
EP0213042A3 (en
EP0213042A2 (de
Inventor
Jean Foulard
Jacques Nicolas
Jean-François Mignot
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
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 AT86401792T priority Critical patent/ATE56642T1/de
Publication of EP0213042A2 publication Critical patent/EP0213042A2/de
Publication of EP0213042A3 publication Critical patent/EP0213042A3/fr
Application granted granted Critical
Publication of EP0213042B1 publication Critical patent/EP0213042B1/de
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
    • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
    • 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

Definitions

  • the present invention relates to the protection of a jet of liquid metal flowing from a pocket outlet or a distributor in a mold, according to which the casting jet is surrounded, over at least part of its height. , a sleeve into which a liquid metal protection gas is injected, so as to limit the contact of the latter with the ambient air between the outlet orifice and the ingot mold.
  • Devices have already been proposed for ensuring this protection, which are of the type comprising two substantially semi-cylindrical half-shells articulated around a vertical axis and each having at their upper end a sheath supplying protective gas.
  • a device of this kind is described in document DE-A-2,517,834 which provides a wafer-shaped sleeve located a short distance from the bottom of the distributor, the gas escaping both through the annular walls of the upper bottom and lower and through a sleeve obviously surrounding the jet over a small part of its height.
  • Such a device is not capable of providing adequate protection in the lower part of the casting jet.
  • the present invention aims to provide gaseous protection over the entire height of the jet of liquid metal, without having to extend to the mold, which is detrimental to the visual control of the casting operation and this objective is achieved.
  • the device in that on the one hand the device is applied in a sealed manner against the lower wall of the distributor, and on the other hand the axial length of the shells is chosen so that, when the device is applied against the bottom of the distributor, leave a clearance of axial length less than 100 mm between the lower end of the shell and the mold.
  • this axial length between the lower end of the shell and the ingot mold is less than 80 mm.
  • the axial length between the lower end of the shell and the ingot mold is less than 80 mm.
  • the invention also relates to an advantageous embodiment according to which the junction planes of the two half-shells partially overlap so as to improve the tightness of the shell.
  • a circular ferrule is provided which is integral with the tundish and intended to improve the gas tightness.
  • gases used to protect the casting jet against oxidation and / or nitriding are those usually used in such cases by those skilled in the art, such as nitrogen, argon, carbon dioxide, etc. ... used alone and / or in mixtures.
  • Figure 1 is a schematic sectional view of an embodiment of the device according to the invention as well as certain variants.
  • the protection device comprises a shell 1 consisting of two complementary half-shells 1A, 1B, as well as means for injecting protective gas, these means essentially consisting of a channel 8 of annular shape placed at the top of the shell 1, this channel 8 being provided with perforations 9 allowing the passage of gas from the supply lines 7A and 7B, respectively connected to the two annular half-channels 8A and 8B constituting the channel 8 and respectively integral with the two half shells 1A and 1B.
  • the device further comprises means for articulation of the half-shells, not shown in the figure. (the diameter, the position, the number of perforations will be determined experimentally by a person skilled in the art, by simple routine experiments, depending on the result that one wishes to obtain and the flow rate of inert gas).
  • the distributor of which only the bottom 3 can be seen in the figure is provided with a ferrule 5 of shape complementary to the external shape of the channel 8, that is to say circular in the present case.
  • the annular channel 8 On its upper face, the annular channel 8 has a circular groove 48 in which is housed a seal 4 ensuring the seal between the distributor and the device according to the invention.
  • the two half-shells 1A and 1B partially overlap along the joint line 6, ensuring a seal thanks to a structure in the form of a baffle.
  • the inner wall 66 of the half-shell 1B is fixed radially to the latter, with a recess 72.
  • the internal wall 65 is fixed radially to the half-shell 1A, at the end of the latter. It also includes a recess 73, complementary to the recess 72, which thus form a baffle 67, 68 and 69 for the gas coming from inside the shell and which would escape towards the outside. With such a pressure drop, the gas, introduced in the form of a laminar flow into the shell through the openings 9, cannot practically escape through the side seal 6.
  • the reference 10A represents two alternative embodiments of the aerodynamic means according to the invention placed at the lower end of the shell 1.
  • the internal wall of the half-shell 1A is chamfered at approximately 45 °, on the one hand, a flange 52 being fixed at the end, on the outer wall of the shell 1, while a flaring 352 of internal diameter D 4 extends the shells 1A, 1B, of internal diameter D 2 at their lower part.
  • the reference 10B shows an alternative embodiment of the walls of the shell 1 making it possible to further improve the gas protection.
  • the half-shells such as 1B, are surrounded, substantially from the base of the annular channel 8 at the lower end of the half-shell, by a sheath 70, arranged coaxially with the half-shells, so as to provide a space 71 which communicates with the annular gas supply channel 8 or gas distribution chamber.
  • This gas supply could be different if we wanted to create a gas duct of a different nature).
  • This sheath 70 preferably comprises an aerodynamic collar 52 at its base.
  • the protection device being designed in particular for continuous casting in molds of small dimensions, it is not possible, in this case to introduce the lower end of the shell into the metal taking into account the respective dimensions of the jet, the shell and the opening of the mold. This is why, there is a clearance between the lower part of the shell and the pouring opening, this clearance allowing moreover the operation of the device during casting, if this proves necessary.
  • the inerting shell 1 centered on the pouring jet 2 is pressed against the bottom of the distributor 3, in an almost leaktight manner, using a seal 4 made of refractory or metalloplastic fibrous product, and / or thanks to the circular ferrule 5.
  • the two half-shells 1A and 1B are pressed one against the other and sealing between them is ensured by the baffle-shaped seal 6 over the entire length of the device.
  • Two gas inlets 7A and 7B, of sufficient diameter to guarantee a very low speed of supply of protective gas lead into the distribution chambers 8A and 8B.
  • the gas then flows in laminar mode through the holes 9 and sheaths the metal jet to the lower part of the shell.
  • aerodynamic means are used.
  • the deflector moreover, results in better coverage of the upper part of the ingot mold thus ensuring greater efficiency of the inerting.
  • the dimensions and shape of the deflector can be adapted to the different formats of the molds.
  • a notch can be formed in a corner of the mold.
  • FIG. 2 is a perspective sketch showing the half-shells in the open position around the casting jet shown diagrammatically by the reference 102.
  • the protection device comprises two complementary half-shells 101A and 101B, surrounded at their upper part by complementary distribution chambers 108A and 108B of semi-annular shape, connected respectively to a gas supply not shown in the figure, and openings pierced 109 regularly distributed over the surface of the corresponding half-shells 101A and 101B, so as to allow the passage of the shielding gas between the half-shells 101A and 101 Swiss pour casting 102.
  • the distribution chambers 108A and 108B are closed at their ends.
  • Each half-shell has at its lower part a half-flange 150A and 150B, complementary to each other.
  • the junction between the half-shells on the one hand and the half-flanges on the other is done using the junction planes 157 and 158 extending respectively from the base of the distribution chambers 108A and 108B to half-flanges 150A and 150B.
  • These junction planes have the shape of a trapezoid-rectangle if the shell is cylindrical. (But this shell can also have the shape of a truncated cone).
  • Junction planes 157 and 158 are so thick that they overlap the joint plane two half-shells thus forming a baffle as described in FIG. 1.
  • the half-flange 150B is slightly longer than the half-circumference of the half-shell 101B at its base. Conversely, the half-collar 150A is slightly shorter than 101A. Thus, the half-flange 150B projects slightly beyond the junction planes 157 and 158, which makes it possible to extend the chicane joint at the level of the half-flanges.
  • the distribution chamber has two annular grooves 104 and 1040 to accommodate a seal with the base of the distributor.
  • Figure 3 shows two sectional views of the device of Figure 2, in the closed position.
  • the two half-shells 101A and 101B bear substantially one on the other at 160, 163, 260, 263, and delimit baffles 161, 162 and 261, 262 respectively.
  • Figure 3B which is a section along the axis AA of Figure 3A has the same references as Figure 3A.
  • FIG. 4A shows diagrammatically a first alternative embodiment of the assembly of the device according to the invention, provided with its control means.
  • the shell 1 comprises a hinge 31 allowing the opening and closing of the half-shells around the pouring jet (not shown) in the opening 30 of the oscillating ingot mold.
  • the shell 1 is connected via 31 to a first arm 32 which pivots horizontally on a second arm 34 around the articulation 33. (movement 1 the vertical arm 34 slides from bottom to top (movement 3 under the action of the jack 35, allowing the device 1 to be pressed onto the distributor (not shown).
  • 35 can be fixed to the casting table.
  • the jack 35 is fixed to the flow distributor 39 and is supplied with compressed air (for maneuvers) via 37 and inerting gas (argon and / or zote, and / or carbon dioxide) via 36.
  • the protection device is fixed on a support forming a protective gas pipe and comprising a movable part allowing the opening of the shells, this can be fixed on the wall of the pocket or of the distributor as well as on any support integral with its cradle, for such purpose to be able to operate the device in a manner integral with the pocket or the distributor; in some cases, it is possible to fix this assembly on the casting table.
  • the support arm is fixed on a journal allowing the exhaust of the jet protection device by a rotation of the latter.
  • a jack resting on the end of the arm applies the half-shell device to the bottom of the distributor, exerting a docking force of approximately 50 deca Newton, to ensure sealing as soon as the actuator goes into action to lower the device, the opening articulation is automatically biased by a spring which has been stretched when closing using a pushing arm held in place by a spring-controlled finger device.
  • FIG. 5 represents a preferred embodiment of the control means of the device according to the invention.
  • the two half-shells are shown diagrammatically by the references 401A and 401B in the open position corresponding to the position of the control means shown in the figure.
  • a main part consisting of a support arm 435, the end of which is bent on the side of the half-shell 401 B which is fixed to it by a ball joint 462.
  • the latter is located substantially at the end of the part right of arm 435.
  • the other half-shell 401A is secured, by the ball joint 461 to a plurality of articulated arms 489, the end 431 of which is bent around the half-shell 401A, connected to the arm 426 by the articulation 428, itself even connected to the arm 423, 421 ending with a control handle 420.
  • the arm 423, 421 slides in a cylindrical guide 422 as well as in a cylindrical guide 424.
  • the guides 422 and 424 are integral with the arm 423, itself fixed by its right end in the figure, to a carriage 450 sliding on a rail 451 in the direction of the arrow F.
  • An operating handle 437 is provided for controlling the rotation of the arm 435 about the axis 0 perpendicular to the plane of the figure.
  • the axis 436 allows rotation of the arm 435, so as to generate the movement of the shells so as to make them cross the plane of the figure.
  • the control lever 420 is pushed to the left in the direction of 422, causing the half-shells to close in the position shown diagrammatically in dotted lines. (a locking system keeps it in this position, unlockable manually).
  • the shell is placed under the distributor, for example using a jack which causes the arm 435 to rotate about the axis 436.
  • the half-shells initially, under the plane of the figure, have their upper side which passes over above the plane of the figure.
  • the reference 401AB represents the two closed half-shells brought into this position after rotation of the arm 435 around the axis 0 (perpendicular to the plane of the figure), followed by a closing of the half-shells using 420 ( then rotation of 435 around axis 436).
  • a protective shell (or sleeve) with an internal diameter of 80 mm is used at its base without collar.
  • the nitrogen flow rate is 60 Nm 3 / h, the specific consumption being approximately 5 Nm 3 / tonne.
  • the lower part of the shell is placed at an average distance from the oscillating ingot mold equal to 50 mm.
  • the speed of ejection of the shell protection gas at the periphery of its lower part is approximately 1.5 m / s, and approximately 3.5 m / s along the jet.
  • the operation is carried out under the same conditions as above with a flow rate of 30 Nm 3 / h.
  • the gas exit velocity at the periphery of the lower part of the shell is about 0.7 m / s, 1.7 m / s near the jet. Results are obtained slightly lower than the previous ones (the oxygen concentration curve equal to 1% between the lower part of the shell and the opening of the ingot mold is slightly closer to the casting jet than previously, but the latter remains perfectly protected).
  • the oxygen contents measured in the ingot mold generally remain above 1%.
  • the oscillations of the ingot mold induce a dilution such that it is generally not possible to obtain an oxygen content of less than 1%, at near the jet, in the mold.
  • the operation is carried out under the same conditions as above with a flow rate of 90 Nm 3 / g.
  • the gas exit velocity is 2.5 m / s and 5.5 m / s respectively.
  • Examples 1, 2 and 3 are repeated by adding a 6 mm flange around the shell with a chamfer at about 45 °, at its lower part, parallel to the opening of the mold.
  • the constant oxygen concentration curves around the casting jet are significantly more distant from the jet than the corresponding curves, in the absence of a collar, which means a slight improvement in the results.
  • the use of a flange can therefore be useful when seeking to further lower the oxygen concentrations near the jet.
  • Examples 1, 2 and 3 are repeated by forming a flare in the lower part of the shell, flare increasing the lower diameter by 12 mm (internal diameter at the lower part of the shell by approximately 92 mm).
  • a flare preferably of circular section, of height substantially equal to the increase in the radius of the shell. In the present case, this height is therefore substantially equal to 6 mm.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Forging (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Gas Separation By Absorption (AREA)
  • Catching Or Destruction (AREA)
  • Chemically Coating (AREA)
  • Disintegrating Or Milling (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (5)

1. Vorrichtung zum Schutz eines aus einer Austrittsöffnung einer Pfanne oder eines Verteilers in eine Blockform austretenden Strahls von flüssigem Metall (2-102) nach Art einer Kokille (1), die zwei im wesentlichen halbzylindrische Halbkokillen (1A-1B, 101A-101B, 401A-401B) umfaßt, die um eine vertikale Achse (31) schwenkbar sind und an ihrem oberen Ende jeweils einen Zuflußkanal (8A-8B, 108A-108B) für Schutzgas aufweisen, welche Kokillen dichtend an der Unterseits des Bodens der Pfanne oder des Verteilers anliegen, dadurch gekennzeichnet, daß die Zuflußkanäle (8A-8B, 108A-108B) an der Außenseite der genannten Kokillen (1A­1B, 101A-101B, 401A-401B) angeordnet sind, mit denen sie durch über den Umfang verteilte Öffnungen (9-109) in Verbindung stehen, und daß die axiale Länge der Kokillen (1 A-1 B, 101A-101B, 401A―401B) so gewählt ist, daß, wenn die Vorrichtung an den Boden (3) des Verteilers angelegt ist, ein Abstand von weniger als 100 mm axialer Länge zwischen dem unteren Ende der Kokille (1) und der Blockform verbleibt.
2. Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die axiale Länge zwischen dem unteren Ende der Kokille (1) und der Blockform weniger als 80 mm beträgt.
3. Schutzvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verbindungsebenen (6) (157-158) der beiden Halbkokillen (1A-1 B) (101A-101 B) sich teilweise überdecken, so daß die Abdichtung der Kokille verbessert wird.
4. Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie in ihrem oberen Abschnitt mindestens einen Dichtungsring (4) (104) aufweist, durch den die Abdichtung zwischen der Kokille und dem Gußverteiler gewährleistet werden kann.
5. Schutzvorrichtung nach Anspruch 1, die dazu bestimmt ist, mit einem Gußverteiler um dessen Ausflußöffnung herumführend verbunden zu werden, dadurch gekennzeichnet, daß sie mit einem Kreisring (5) zusammenwirkt, der fest an dem Verteilere angebracht und dazu bestimmt ist, die Abdichtung gegen das Gas zu verbessern.
EP86401792A 1985-08-14 1986-08-11 Vorrichtung zum Schutz eines flüssigen Giesstrahls gegen Oxydation und/oder Nitrierung Expired - Lifetime EP0213042B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401792T ATE56642T1 (de) 1985-08-14 1986-08-11 Vorrichtung zum schutz eines fluessigen giesstrahls gegen oxydation und/oder nitrierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8512378A FR2586210B1 (fr) 1985-08-14 1985-08-14 Dispositif de protection contre l'oxydation et/ou la nitruration d'un jet de metal liquide et son utilisation
FR8512378 1985-08-14

Publications (3)

Publication Number Publication Date
EP0213042A2 EP0213042A2 (de) 1987-03-04
EP0213042A3 EP0213042A3 (en) 1988-12-07
EP0213042B1 true EP0213042B1 (de) 1990-09-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401792A Expired - Lifetime EP0213042B1 (de) 1985-08-14 1986-08-11 Vorrichtung zum Schutz eines flüssigen Giesstrahls gegen Oxydation und/oder Nitrierung

Country Status (13)

Country Link
US (1) US4805688A (de)
EP (1) EP0213042B1 (de)
JP (1) JPS6297759A (de)
KR (1) KR870001888A (de)
AT (1) ATE56642T1 (de)
AU (1) AU594354B2 (de)
BR (1) BR8603875A (de)
CA (1) CA1299837C (de)
DE (1) DE3674293D1 (de)
ES (1) ES2001086A6 (de)
FR (1) FR2586210B1 (de)
PT (1) PT83195B (de)
ZA (1) ZA866054B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642678A1 (fr) * 1989-02-07 1990-08-10 Air Liquide Procede d'elaboration d'une atmosphere gazeuse en contact avec un metal a haute temperature
US5421562A (en) * 1994-04-28 1995-06-06 General Motors Corporation Gas-shielded siphonic valve
US6228187B1 (en) 1998-08-19 2001-05-08 Air Liquide America Corp. Apparatus and methods for generating an artificial atmosphere for the heat treating of materials
US6491863B2 (en) 2000-12-12 2002-12-10 L'air Liquide-Societe' Anonyme A' Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes George Claude Method and apparatus for efficient utilization of a cryogen for inert cover in metals melting furnaces
KR100864444B1 (ko) * 2002-04-24 2008-10-20 주식회사 포스코 연속주조설비의 용강 산화방지장치
US20060266793A1 (en) * 2005-05-24 2006-11-30 Caterpillar Inc. Purging system having workpiece movement device
US20190210099A1 (en) * 2017-10-05 2019-07-11 Emirates Steel Industries PJSC Method for continuous casting of two or more long products using a single continuous casting strand

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
US3439735A (en) * 1965-11-19 1969-04-22 Union Carbide Corp Continuous casting apparatus with inert gas protector
US3616843A (en) * 1969-11-25 1971-11-02 Koppers Co Inc Apparatus for shrouding in a continuous casting machine
DE2517834A1 (de) * 1975-04-22 1976-11-04 Linde Ag Stranggiessanlage
GR61761B (en) * 1975-11-12 1979-01-09 Linde Ag Casting plant
US4084799A (en) * 1976-08-30 1978-04-18 Georgetown Steel Corporation Shrouding apparatus
US4270595A (en) * 1978-09-08 1981-06-02 Georgetown Steel Corporation Shroud with replaceable extension
AT368415B (de) * 1979-02-20 1982-10-11 Voest Alpine Ag Einrichtung an einem metallurgischen gefaess mit einem schutzrohr
JPS5748307A (en) * 1980-09-05 1982-03-19 Toray Silicone Co Ltd Composition of defoaming agent
FR2523007A1 (fr) * 1982-03-15 1983-09-16 Air Liquide Procede et installation de protection d'un jet de coulee de metal liquide
CH660700A5 (de) * 1983-08-12 1987-06-15 Finanz Handels Invest Fhi Abschirmvorrichtung fuer einen giessstrahl aus fluessigem material.

Also Published As

Publication number Publication date
FR2586210A1 (fr) 1987-02-20
PT83195B (pt) 1992-10-30
US4805688A (en) 1989-02-21
AU594354B2 (en) 1990-03-08
EP0213042A3 (en) 1988-12-07
CA1299837C (fr) 1992-05-05
JPS6297759A (ja) 1987-05-07
ZA866054B (en) 1987-03-25
PT83195A (fr) 1986-09-01
AU6118286A (en) 1987-02-19
BR8603875A (pt) 1987-03-24
FR2586210B1 (fr) 1988-05-13
ATE56642T1 (de) 1990-10-15
KR870001888A (ko) 1987-03-28
EP0213042A2 (de) 1987-03-04
DE3674293D1 (de) 1990-10-25
ES2001086A6 (es) 1988-04-16

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