EP0142674B1 - Dispositif pour la coulée d'acier en bande dans un moule de coulée continue avec parois de moule tournantes - Google Patents

Dispositif pour la coulée d'acier en bande dans un moule de coulée continue avec parois de moule tournantes Download PDF

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Publication number
EP0142674B1
EP0142674B1 EP84111314A EP84111314A EP0142674B1 EP 0142674 B1 EP0142674 B1 EP 0142674B1 EP 84111314 A EP84111314 A EP 84111314A EP 84111314 A EP84111314 A EP 84111314A EP 0142674 B1 EP0142674 B1 EP 0142674B1
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EP
European Patent Office
Prior art keywords
casting
ceramic
mouthpiece
wheels
ceramic wheels
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
EP84111314A
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German (de)
English (en)
Other versions
EP0142674A1 (fr
Inventor
Gerd Artz
Dieter Figge
Jürgen Dr. Pötschke
Thomas Dr. Hoster
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.)
Fried Krupp AG
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Fried Krupp AG
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Filing date
Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Priority to AT84111314T priority Critical patent/ATE26660T1/de
Publication of EP0142674A1 publication Critical patent/EP0142674A1/fr
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Publication of EP0142674B1 publication Critical patent/EP0142674B1/fr
Expired legal-status Critical Current

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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
    • B22D11/0645—Sealing means for the nozzle between the travelling surfaces

Definitions

  • the invention relates to a device for strip casting of steel, in particular of strip cross-sections with a small thickness up to a lower limit of about 30 mm and a width of about 500 to 1500 mm, in a continuous casting mold with moving mold walls that delimit a casting cavity and consist of endless pairs opposing each other Casting belts and endless side dams into which the mouthpiece of a tubular pouring nozzle protrudes.
  • a device for strip casting of steel in particular of strip cross-sections with a small thickness up to a lower limit of about 30 mm and a width of about 500 to 1500 mm
  • Such a device is known from document BE-A-553 709.
  • Continuous casting molds with moving mold walls are now used successfully for casting lead, zinc and copper at a high casting speed of around 10 m / min, whereby the molten metal is fed into the casting cavity via a channel.
  • the two side dams serving as side boundaries pass through the continuous casting mold essentially in a straight line; only to compensate for the solidification-related shrinkage of the casting strand, their mutual position in the casting direction decreases slightly.
  • continuous casting molds with moving mold walls are required, which are designed with tubular, i.e. closed pouring nozzles. These also allow casting under pressure, thereby eliminating undesirable fluctuations in the casting level within the continuous casting mold and achieving uniform, symmetrical cooling of the casting product.
  • a flawless steel feed with regard to the required sealing between the parts moving relative to each other (casting nozzle, mold walls) as well as avoiding freezing and undesired solidification in the area of the mouthpiece of the casting nozzle can already be achieved with billet cross sections (e.g. with a width of 180 mm) difficult to achieve and requires the maintenance of a tight sealing gap between the mouthpiece and the moving mold walls which is as constant as possible.
  • the casting of strip cross-sections (for example with a width between 500 and 1500 mm) can only be carried out with additional effort, given the correspondingly enlarged dimensions of the pouring nozzle, which correspond approximately to those of the casting product, since the enlarged dimensions increase the risk of deformation of the pouring nozzle and increase it Material costs (for example the casting nozzle consisting at least partially of boron nitride).
  • the invention has for its object to develop a device for strip casting of steel, which is also given the band cross-sections given here in relation to their small thickness from the material and energy side and with a view to achieving a perfect seal between the relative moving parts to each other is as little as possible.
  • the object is achieved by a device which essentially has the features of claim 1.
  • the basic idea of the invention is then, with sufficient tightness between the continuous casting mold and the mouthpiece of the pouring nozzle protruding into it, to make its outlet width at the outlet cross section considerably narrower (i.e. by more than a factor of 2) than the mutual spacing of the side dams from one another, which is the width of the cast tape sets.
  • the intermediate space between the parts which are moved relative to one another is bridged by two circumferential ceramic wheels which are at least equipped with a ceramic wheel rim; these each form a sealing point simultaneously with the mouthpiece and with the side dam opposite it and with the casting belts.
  • the object of the invention is thus designed in principle so that the outlet cross section of the mouthpiece extends over the sections of the peripheral surfaces of the ceramic wheels that adjoin in the casting direction up to the mutual spacing of the side dams that defines the width of the casting cavity.
  • the drive of the ceramic wheels is expediently designed such that they rotate on the side facing the mouthpiece against the casting direction (claim 2); this has the consequence that the movement of the ceramic wheels in the vicinity of the side dams coincides with their movement in the casting direction.
  • the molten steel is thus transported away in the casting direction in the transition area between the ceramic wheels and the side dams.
  • the ceramic wheels are each equipped with a coating unit in the area of their outer section facing away from the casting cavity (i.e. in the rear area between the mouthpiece and the side dams), via which at least their peripheral surfaces can be coated with a coating agent ( Claim 3); This can in particular contain graphite or consist of a boron nitride emulsion.
  • a coating agent Claim 3
  • This can in particular contain graphite or consist of a boron nitride emulsion.
  • the ceramic wheels are equipped with heating units via which at least their peripheral surface can be preheated to a temperature between 900 to 1300 ° C., preferably to 1100 ° C. (claim 4).
  • the heating units are fixed in the area between the wheel rims and the ceramic wheel axles (claim 5) and preferably face the casting cavity (claim 6), so that the heating is particularly intensively effective in the area associated with the Molten steel comes into contact.
  • the subject of the invention can also do so be configured such that the heating units are opposite the ceramic wheels in the region of their outer section facing away from the casting cavity (claim 7); in this case, the ceramic wheels are heated from the outside.
  • the ceramic wheels are furthermore expediently equipped with a drive in the region of their outer section facing away from the casting cavity (claim 8); this consists in particular of drive rollers equipped with a compressed air motor, which are held resiliently in contact with the ceramic wheels (claim 9).
  • the advantage of using rotating ceramic wheels is also that, if necessary, after passing through the casting cavity, i.e. can be driven, coated and heated on the way back on the front side of the continuous casting mold in the casting direction.
  • the embodiment with heating units arranged between the wheel rims and the ceramic wheel axles can advantageously be developed in such a way that the heating units in the form of inductors are at the same time designed as an electromagnetic barrier, which prevents the molten steel from escaping past the ceramic wheels against the casting direction prevented (claim 10).
  • the heating units in this case therefore have a double function: the heating units required anyway for preheating the ceramic wheels also generate electromagnetic forces, which prevent the passage of molten steel at the sealing points between the mouthpiece and the ceramic wheels or between these and the side dams.
  • the double-action heating units mentioned here are preferably designed and arranged in such a way that their effectiveness extends in particular into the area of the two sealing points.
  • the mouthpiece In order to achieve a sufficient tightness between the mouthpiece (i.e. between its curved outer surfaces interacting with the ceramic wheels) and the ceramic wheels, the mouthpiece, which is movably mounted in the casting direction, is resiliently supported on the ceramic wheels near its outlet cross section (claim 11).
  • the seal between the ceramic wheels and the side dams can be realized in that they are held in spring contact with the ceramic wheels via a pressing unit (claim 12).
  • the drive roller already mentioned is normally used as the drive unit (cf. claim 9).
  • the side dams can also consist of endless multi-layer steel belts which are held on the former by means of deflection rollers lying in front of the ceramic wheels, as seen in the casting direction (claim 13); in these embodiments with side dams that curve in the horizontal plane, there is no need for a special drive unit for the ceramic wheels: these are driven by the endless multi-layer steel belts.
  • the seal between the ceramic wheels and the multi-layer steel strips can also advantageously be brought about by the fact that the outside of the Multi-layer steel strips opposite additional inductors, each of which cooperate with the inductor of the associated ceramic wheel (claim 14).
  • an electrical barrier is formed not only via the inductors of the ceramic wheels opposite one another with respect to the pouring nozzle, but also via the inductors and additional inductors opposite one another with respect to the multi-layer steel strips, which prevents the escape of steel melt against the casting direction to the outside.
  • the side dams are expediently straight and at least approximately parallel to one another over the entire length of the casting cavity.
  • the melt to be processed does not come from a placed front container through a tubular pouring nozzle 1 with a mouthpiece 1 'into the casting cavity 2 of a continuous casting mold which is laterally delimited by two side dams 3 with individual links 3' forming an endless chain and above and below by two endless casting belts 4 (shown in FIG. 4) is.
  • the components 3 and 4 move in the area of the casting cavity 2 at the same speed in accordance with the casting direction (arrow 5) from left to right (cf. FIG. 1).
  • the longitudinal axis 6 'of the bore 6 of the pouring nozzle 1 coincides with the longitudinal axis 2' of the casting cavity.
  • the width b of the mouthpiece 1 'at its outlet cross section 1 is 200 mm many times smaller than the mutual distance B of the side dams 3 of 1200 mm, which defines the width of the cast product. This remains - apart from a slight reduction to compensate for the Solidification of the steel melt shrinkage process - unchanged over the longitudinal extent of the casting cavity 3, ie the side dams 3 run approximately parallel to one another in this area.
  • the space between the side dams 3 and the outer surfaces 1' '' facing them is bridged by two circumferential ceramic wheels 7, the vertical wheel axes 7 'of which in the area of the Exit cross section 1 "are arranged in a fixed position and which - at least in the area of their wheel rims 7" - consist of a ceramic material resistant to molten steel, in particular alumina graphite, silica or zirconium oxide.
  • each ceramic wheel 7 forms a sealing point 8 or 9 with the correspondingly curved outer surface 1 "" of the mouthpiece and with the side dam 3 opposite it.
  • the ceramic wheels 7 rotate in the manner indicated by arrows 10 and 11, i.e. their direction of rotation in the vicinity of the mouthpiece 1 'is opposite to the pouring direction (arrow 5) and corresponds in the area of the sealing point 8 with the direction of movement of the side dams 3: the ceramic wheel located at the top in FIG. 1 thus rotates clockwise, the ceramic wheel below it counterclockwise .
  • Each ceramic wheel 7 is equipped in the area of its outer section facing away from the casting cavity 2 (i.e. on the feed side of the continuous casting mold) in the area between the side dam and the mouthpiece with the additional equipment that may be required. These exist - each seen in the direction of rotation of the ceramic wheel 7 in question
  • a coating unit 12 by means of which, for example, a graphite-containing coating agent is applied at least to the peripheral surface of the ceramic wheel in question, from a drive 23 and from a heating unit 14, by means of which at least the peripheral surface can be preheated to a temperature of approximately 1100 ° C.
  • Each ceramic wheel 7 therefore has two different effective areas, namely a working area on the side facing the casting cavity 2 and an operating area on the outward, opposite outer section.
  • Each ceramic wheel 7 (see Fig. 2) is preferably formed in one piece, i.e. the wheel rim 7 "passes directly into the wheel hub 7" ', through which the wheel axle 7' is fixed.
  • At least the wheel rim 7 ′′ consists of a ceramic material; the components that adjoin inward in the direction of the wheel axle 7 ′ can optionally also be made of metal.
  • the drive 13 (FIG. 3) arranged on the feed side of the continuous casting mold essentially consists of a drive roller 15 which is fastened to an eccentric bush 16 and via a spring 17 supported on the stationary environment on the peripheral surface of the ceramic wheel 7 formed by the wheel rim 7 ′′ 3)
  • the stationary environment consists of a support arm 18 which also carries the wheel axle 7 '.
  • Each ceramic wheel 7 is dimensioned with respect to its height such that it forms a sealing point with the top and bottom casting belt 4 over the horizontal surfaces of its wheel rim 7 ", by means of which steel melt is prevented from escaping from the casting cavity in the opposite direction to the casting direction.
  • the ceramic wheels 7 on the feed side of the continuous casting mold are each equipped only with the coating unit 12 and the drive in the form of the drive roller 1.
  • the heating unit 14 consists of a semicircular heating element, which is arranged on the side facing the casting cavity 2 within the wheel rim 7 ′′. Due to its arrangement and shape, the heating unit 14 is effective in the area in which the associated ceramic wheel with the steel melt coming out of the mouthpiece 1 'comes into contact.
  • the latter is movably mounted in the longitudinal direction in a stationary guide 23 and is equipped with pressure springs 24 which engage it and which resiliently rest against the ceramic wheels in the casting direction hold.
  • the sealing effect between the ceramic wheels and the side dams 3 is improved in that they are supported on stationary guide rulers 26 with the interposition of transverse springs 25.
  • the transverse springs 25 are each in the area ordered, which is determined by the connecting line of the two wheel axles 7 '.
  • the associated top and bottom mouthpiece walls are bulged in the casting direction.
  • the walls mentioned thus project further into the casting cavity 2 of the continuous casting mold than the side walls running perpendicularly thereto at the outlet cross section 1 ′′.
  • the heating units 14, which are held stationary within the ceramic wheels 7 and are designed as inductors, are extended so far that they extend in the direction of rotation up to the area of the curved outer surfaces 1 "'of the mouthpiece and counter to the direction of rotation as already described extend into the area of the sealing points 8 with the side dams 3.
  • the heating units 14 formed in this way and enclosing an angle of more than 180 ° serve not only to preheat the ceramic wheels; Together they also generate electromagnetic forces which prevent or at least make it more difficult for steel melt to penetrate into the area of the sealing point 9 between the parts 1 'and 7.
  • side dams 3 can also be used which consist of several layers of endless steel strips 3 "arranged next to one another (cf. FIG. 7) and consequently are able to negotiate curves in the horizontal plane.
  • the multilayer steel belts 3 "are guided via driven deflection rollers 27, which lie in front of the ceramic wheels 7 in the casting direction (arrow 5), in such a way that a wrapping section forming a sealing point 8 is formed with the ceramic wheels.
  • This is expediently designed in this way that the ceramic wheels are also moved without their own drive in the direction of arrows 10 and 11.
  • the additional devices required for operating the ceramic wheels 7 therefore consist only of a coating unit 12 and a heating unit 14.
  • the bearings of the deflection rollers 27 should be designed to adapt to length tolerances such that the position of the axes of rotation 27 'with respect to that of the wheel axes 7' can be adjusted.
  • the sealing point 8 between the ceramic wheels 7 and the multi-layer steel strips 3 "- as well as the sealing point 9 - can be blocked to the outside by means of electromagnetic forces against the escape of steel melt.
  • stationary additional inductors 28 are arranged on the outside of the multi-layer steel belts at the level of the connecting line of the wheel axles 7 ', each of which cooperates with the heating unit 14 of the ceramic wheel 7 adjacent to them.
  • an additional inductor 28 and a heating unit 14 thus jointly form one of them Electromagnetic barrier counteracting molten steel.
  • the steel strips 3 "of the embodiment according to FIG. 7 have a thickness in the order of magnitude of 1 mm; the individual links 3 'of the side dams 3 shown for example in FIG. 1 are made as castings from a brass alloy.
  • the ceramic wheels 7 should be arranged with respect to the mouthpiece in such a way that their wheel axes 7' lie at least in the vicinity of the exit cross section 1 " .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (14)

1. Dispositif pour la coulée d'acier en bande, notamment de bandes de faible épaisseur allant jusqu'à une limite inférieure de 30 mm environ et ayant une largeur de 500 à 1 500 mm environ, dans un moule de coulée continue avec parois de moule tournantes délimitant une cavité de coulée (2) et constituées par des paires de bandes de coulée (4) sans fin et des parois latérales (3) sans fin entre lesquelles pénètre le bec ( 1 ) d'une buse de coulée tubulaire (1 ), caractérisé en ce que l'espace intermédiaire compris entre le bec ( 1 de la buse de coulée (1 dont la largeur (b) au niveau de sa section de sortie (1 ") représente moins de 50% de la largeur (B) de la section transversale de la bande, et les parois latérales (3) voisines est couvert par deux roues (7) en matière céramique qui comportent au moins une couronne (7") an matière céramique et qui, avec le bec et la paroi latérale qui lui est opposée ainsi que les bandes de coulée (4), constituent un emplacement d'étanchéité (8 ou 9).
2. Dispositif selon la revendication 1, caractérisé en ce que les roues (7) en matière céramique tournent, du côté dirigé vers la buse (1'), en sens inverse de la direction de coulée (flèche 5).
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que, dans la zone de leur secteur extérieur le plus éloigné de la cavité de coulée (2), les roues (7) en matière céramique comportent chacune une unité de revêtemet (12) au moyen de laquelle leurs surfaces périphériques au moins peuvent être recouvertes par un moyen de revêtement.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que les roues (7) en matière céramique sont munies d'unités de chauffage (14) qui permettent de préchauffer leurs surfaces à une température comprise entre 900 et 1300 °C, de préférence à 1100°C.
5. Dispositif selon la revendication 4, caractérisé en ce que les unités de chauffage (14) sont placées à poste fixe dans la zone comprise entre les couronnes (7") et les axes (7') des roues en matière céramique.
6. Dispositif selon la revendication 5, caractérisé en ce que les unités de chauffage (14) sont tournées du côté de la cavité de coulée (2).
7. Dispositif selon la revendication 4, caractérisé en ce que les unités de chauffage (14) sont en face des roues (7) en matière céramique dans la zone de leur secteur extérieur situé du côté opposé à la cavité de coulée (2).
8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que les roues (7) en matière céramique sont, dans la zone de leur secteur extérieur situé du côté opposé à la cavité de coulée (2) sont munies d'un dispositif d'entraînement (13).
9. Dispositif selon la revendication 8, caractérisé en ce que les roues (7) en matière céramique sont entraînées par des rouleaux d'entraînement (17) qui sont appliqués élastiquement contre elles et sont munis d'un moteur (23) à air comprimé.
10. Dispositif selon la revendication 5, caractérisé en ce que les unités de chauffage (14) qui sont des inducteurs constituent en même temps une barrière électromagnétique qui empêche l'acier liquide de passer devant les roues (7) en matière céramique en sens inverse de la direction de coulée (flèche 5).
11. Dispositif selon l'une des revendications 1 à 10, caractérisé en ce que le bec (1') monté sur palier de manière à pouvoir se déplacer dans le sens de la coulée (flèche 5) prend appui élastiquement, à proximité de sa section de sortie (1 "), sur les roues (7) en matière céramique.
12. Dispositif selon l'une des revendications 1 à 11, caractérisé en ce que les bords latéraux (3) sont maintenus élastiquement au contact des roues (7) en matière céramique.
13. Dispositif selon l'une des revendications 1 à 12, caractérisé en ce que les bords latéraux (3) sont constitués par des bandes d'acier multicouches (3") qui sont maintenues au contact des bords latéraux par des rouleaux de renvoi (27) situés, dans le sens de la coulée (flèche 5), devant les roues (7) en matière céramique
14. Dispositif selon les revendications 10 et 13, caractérisé en ce qu'en face des unités de chauffage (14) constituées par des inducteurs se trouvent, du côté extérieur des bandes d'acier multicouches (3"), des inducteurs supplémentaires (28) qui empêchent avec elles la sortie de l'acier liquide, en sens inverse de la direction de coulée, entre les roues (7) en matière céramique et les bandes d'acier multicouches.
EP84111314A 1983-10-15 1984-09-22 Dispositif pour la coulée d'acier en bande dans un moule de coulée continue avec parois de moule tournantes Expired EP0142674B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111314T ATE26660T1 (de) 1983-10-15 1984-09-22 Vorrichtung zum bandgiessen von stahl in einer stranggiesskokille mit mitlaufenden kokillenwaenden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3337583 1983-10-15
DE3337583A DE3337583C1 (de) 1983-10-15 1983-10-15 Vorrichtung zum Bandgiessen von Stahl in einer Stranggiesskokille mit mitlaufenden Kokillenwaenden

Publications (2)

Publication Number Publication Date
EP0142674A1 EP0142674A1 (fr) 1985-05-29
EP0142674B1 true EP0142674B1 (fr) 1987-04-22

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EP84111314A Expired EP0142674B1 (fr) 1983-10-15 1984-09-22 Dispositif pour la coulée d'acier en bande dans un moule de coulée continue avec parois de moule tournantes

Country Status (5)

Country Link
US (1) US4553582A (fr)
EP (1) EP0142674B1 (fr)
JP (1) JPS6099457A (fr)
AT (1) ATE26660T1 (fr)
DE (1) DE3337583C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2014035B3 (es) * 1986-04-30 1990-06-16 Larex Ag Tobera de vertido de varias partes para introduccion de funcion metalica en la camara de vertido de una maquina de colado.
DE3703997A1 (de) * 1987-02-10 1988-08-18 Mannesmann Ag Vorrichtung zum stranggiessen von duennen straengen aus metall, insbesondere aus stahl

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE553709A (fr) * 1955-12-27 1960-01-29

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1061459A (en) * 1964-12-02 1967-03-15 Aluminium Lab Ltd Improvements in or relating to continuous casting of metals
US3857437A (en) * 1973-03-22 1974-12-31 Technicon Instr Method and apparatus for continuously casting metals
DE3009189B1 (de) * 1980-03-11 1981-08-20 Mannesmann Demag Ag, 4100 Duisburg Verfahren zum Horizontalstranggiessen von fluessigen Metallen,insbesondere von Stahl,und Einrichtung dazu
JPS56154265A (en) * 1980-04-30 1981-11-28 Mitsubishi Heavy Ind Ltd Endless track type horizontal continuous casting device
JPS5788952A (en) * 1980-11-21 1982-06-03 Mitsubishi Heavy Ind Ltd Sealing method for hot-water feed nozzle in endless track type horizontal continuous casting machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE553709A (fr) * 1955-12-27 1960-01-29

Also Published As

Publication number Publication date
US4553582A (en) 1985-11-19
EP0142674A1 (fr) 1985-05-29
DE3337583C1 (de) 1984-12-06
JPS6099457A (ja) 1985-06-03
ATE26660T1 (de) 1987-05-15

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