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EP0154250B1 - Procédé et dispositif pour la coulée continue des métaux entre deux tambours refroidis à axes parallèles - Google Patents

Procédé et dispositif pour la coulée continue des métaux entre deux tambours refroidis à axes parallèles Download PDF

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Publication number
EP0154250B1
EP0154250B1 EP85101821A EP85101821A EP0154250B1 EP 0154250 B1 EP0154250 B1 EP 0154250B1 EP 85101821 A EP85101821 A EP 85101821A EP 85101821 A EP85101821 A EP 85101821A EP 0154250 B1 EP0154250 B1 EP 0154250B1
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EP
European Patent Office
Prior art keywords
drums
drum
hollow mould
mould chamber
gap
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
EP85101821A
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German (de)
English (en)
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EP0154250A2 (fr
EP0154250A3 (en
Inventor
Fritz Willim
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.)
Clecim SAS
Original Assignee
Concast Service Union AG
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Filing date
Publication date
Application filed by Concast Service Union AG filed Critical Concast Service Union AG
Priority to AT85101821T priority Critical patent/ATE33774T1/de
Publication of EP0154250A2 publication Critical patent/EP0154250A2/fr
Publication of EP0154250A3 publication Critical patent/EP0154250A3/de
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Publication of EP0154250B1 publication Critical patent/EP0154250B1/fr
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
    • 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
    • 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 a method and a device for the continuous casting of metals, in particular steel in the form of strip or thin slabs, between two cooled axially parallel drums, the opposite lateral surfaces of which are moved uniformly in the metal feed direction at the strand withdrawal speed, the liquid metal in a mold cavity delimited by the two drums and the cast strip is held against the lateral surface of the one drum after the closest drum distance.
  • a method and a device for the continuous casting of metals, in particular steel strips, are known from DE-A-2 063 591, which forms the preambles of claims 1 and 6, respectively.
  • the steel is poured into a mold cavity (gap) between two cooled axially parallel drums.
  • the mutually opposite lateral surfaces of these drums move uniformly in the metal feed direction at the strand withdrawal speed.
  • the cast, at least largely solidified strip is held against the lateral surface of the one drum after the closest drum distance.
  • this process can only be used for casting thin strips. For thicker strips or thin slabs, for example 10 or more mm thick, this method is used with a B.
  • the invention has for its object to provide a continuous casting method according to the preamble and a system for strips and thin slabs, which overcomes the disadvantages mentioned and can work with much higher casting performance and simple, reliable and inexpensive facilities.
  • Another characteristic feature of the invention is that the metallostatic pressure in the mold cavity and immediately after it emerges from it is additionally kept low.
  • the casting metal is introduced into the mold cavity from a storage container via a feed device which communicates with it in such a way that the bath level in the storage container is held at a height just a little above the highest point on the entry side of the mold cavity. On the one hand, this prevents air from entering the mold cavity when it enters the mold.
  • the strip has left the mold cavity, there is no inadmissible metallostatic pressure on the top of the strip, which is not yet supported, so it does not bulge. Nevertheless, due to the air pressure prevailing on the storage container, the liquid steel inside the belt can rise to the highest point of the belt wound around the lower drum.
  • a uniform cooling of the two crusts converging in the gap can be achieved and strand defects or casting disturbances can be prevented according to an additional feature if the peripheral speed of the surfaces of the two drums in contact with the broad sides of the band forming is unequal and the ratio of the peripheral speed V 3 the outer surface of the wrapped drum with the radius R 3 to the peripheral speed V 2 of the outer surface of the unwrapped drum of the equation follows, where d corresponds to the roller gap in the narrowest gap.
  • the strand on the narrow sides may only solidify when the mold cavity delimited by the two mutually approaching lateral surfaces of the drums is narrowed only slightly, for example in accordance with the thermal shrinkage. Otherwise the strand may become blocked in the mold cavity or the narrow sides of the strand may be deformed inadmissibly.
  • the metal feed device on the narrow sides with wedge-shaped walls can protrude into the mold cavity until they are covered over their entire height by the narrow side flanks moving synchronously with the one drum.
  • the feed device In order to achieve a continuous emptying of the intermediate vessel at the end of a casting, it is additionally proposed to tilt the feed device together with the upper drum, preferably concentrically around the center of the lower drum, in such a way that the center axis of the feed channel at the end of the pour from the operating position into an at least horizontal one Location is pivotable.
  • the casting metal present in the intermediate vessel can thereby be completely or largely cast into one strand.
  • a continuous emptying can also be achieved if the cast metal is pressed through the supply channel by means of continuously adjustable gas pressure in the intermediate vessel.
  • the intermediate vessel is to be provided with a gas-tight lid and the intermediate vessel cavity is to be connected to a gas pressure source with controllable pressure.
  • Fig. 1, 2 shows an upper and 3 a lower cooling drum axially parallel.
  • the drum jackets are made in a manner known per se from a metal with high thermal conductivity such as copper etc. and are water-cooled.
  • This cast strip 12 has a liquid core 11 over a wrap angle 15 of, for example, 180-210 ° of the drum circumference. This wrap angle 15 could also be chosen to be smaller, for example between 90 and 100 °.
  • the two drums 2, 3 are arranged one above the other.
  • the feed device 5 is communicatively connected to an intermediate vessel 13 and can form an angle a of 5 ° -45 °, preferably 15 ° -30 °, with respect to a horizontal 14.
  • the casting metal flows from the intermediate vessel 13 via a feed channel 16, which opens into the feed device 5, into the mold cavity 7.
  • a bath level 17 in the intermediate vessel or reservoir 13 is kept at a level during the casting that is at least that of point 18 of the mold cavity 7 corresponds.
  • the pouring system is shown in dash-dot lines in FIG. 1 in a pivoted position for emptying the intermediate vessel 13.
  • a piston-cylinder unit 40 which can be articulated on a support 45, which is partially shown, for the drum 2, this is pivoted with the upper drum 2 about the central axis 6 of the lower drum 3 together with the feed device 5.
  • a central axis 20 of the feed channel 16 is brought into an approximately horizontal position in order to be able to empty the casting metal in the intermediate vessel at the end of a casting. All or part of the rollers 10 of the support corset can be moved in the direction of an arrow 43 during the tilting movement by a corresponding path.
  • the intermediate vessel 13 is emptied by gas pressure, it is provided with a gas-tight cover 41 and a connecting piece 44 is connected to a gas pressure source with controllable pressure.
  • the intermediate vessel can be emptied by an electromagnetic pump 42, which is shown schematically in FIG. 1.
  • a lower drum 23 is provided with synchronously moving narrow side flanks 24 which, as shown in the present example, are a few mm higher than the drum gap 25.
  • a mold cavity 27 is delimited by the drum gap 25, by the narrow side flanks 24 arranged on both sides of the drum 23 and moved synchronously with it, by lateral surface sections 28, 29 of the two drums 22, 23 and by delimiting surfaces of the feed device 30.
  • This mold cavity 27 is on the narrow sides , ie along the narrow side flanks 24, shorter in the casting direction 31 than in the middle 32 of the broad side.
  • the narrow side flanks 24 moved synchronously with the drum 23 are lower than the greatest height 34 of the mold cavity 27.
  • the mold cavity 27 is first closed on its narrow sides by the fingers 36, 36 'of the metal feed device 30 projecting in a wedge shape against the drum gap 25 and then by the Narrow side flanks 29 after the drum 22 between them over the whole Width of the mold cavity 27 protrudes.
  • a stationary side wall 38 delimiting the mold cavity 27 is shown as a further exemplary embodiment in the lower half of the image instead of the narrow side flank 24 of the upper half of the image moved with the drum 23.
  • the method according to the invention can be used as described below.
  • the strip thickness to be cast is matched to the downstream rolling devices.
  • the bandwidth is to be selected according to the customer orders, with the drums and the metal feed device being adapted accordingly.
  • the melting units upstream of the continuous casting plant generally produce at an approximately constant throughput rate, which is very high, for example when steel is produced, and can exceed 100 t / h.
  • casting must be done faster with smaller strip widths than with larger ones, but under conditions that can be used in large industrial applications, so quickly that the cast strip 12 only solidifies on the outer crusts when it leaves the mold cavity through the gap 25 , but is still liquid at the core.
  • the naturally increasing pressure of the liquid core can easily be compensated for by a support corset 10 which partially surrounds the drum 3 and at a constant distance corresponding to the narrowest gap 4.
  • the end point of the core solidification can lie anywhere in front of the lower end of the support corset 10, whereby the operationally desired flexibility is achieved.
  • the peripheral speed on the outer curve is greater than on the inner curve.
  • the peripheral speed V 2 of the drum 2 is greater is as the peripheral speed V 3 of the drum 3 and that according to the formula
  • R 3 is the radius of the drum 3 and d is the gap thickness 4 (FIG. 1).
  • the lengths of the mold cavity denoted by 8 in FIGS. 1 and 28 and 29 in FIGS. 2 and 3 result in the sense of a general teaching, depending on the casting speed, of the contact time of the upper drum with the strand being formed. This length is decisive for the solidification of a sufficiently strong strand crust.
  • the mold cavity length 8 or 28, 29 is selected according to an embodiment of the invention in coordination with the casting speed and the drum diameter and include at least an arc dimension of 20 ° of the drum circumference. With appropriate dimensioning of the mold cavity length and the drum diameter, the metal feed device can also be dimensioned in such a way that the steel does not freeze at the start of casting and the steel can be fed to the mold cavity at low speed and with minimal turbulence.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Braking Arrangements (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (15)

1. Procédé pour la coulée continue de métaux, notamment d'acier, en forme de bande ou de minces brames, entre deux tambours refroidis (2, 3 ; 22, 23) à axes parallèles, dont les surfaces périphériques, qui se font face, sont déplacées uniformément dans la direction d'amenée du métal à la vitesse d'extraction de la bande ou barre coulée, selon lequel on amène le métal liquide dans une cavité de formage (7) délimitée par les deux tambours (2, 3 ; 22, 23) et, à la suite du point (4 ; 25) où le passage en forme de fente entre les deux tambours est le plus étroit, on maintient la bande coulée (12) contre la surface périphérique d'un des tambours (3 ; 23), caractérisé en ce que, pour une puissance de refroidissement donnée des surfaces périphériques des tambours de refroidissement (2, 3 ; 22, 23), on choisit dans la cavité de formage (7) un rapport tel entre l'épaisseur de la bande et la vitesse de coulée que la bande (12) quitte le point le plus étroit de la fente (4 ; 25) entre les tambours (2, 3 ; 22, 23) avec un coeur liquide (11), et on maintient la bande contre la surface périphérique d'un des tambours (3 ; 23), le long d'un angle d'enroulement (15), dans un corset de soutien (10) faisant suite à ce point le plus étroit (4 ; 25), en la refroidissant davantage et en provoquant sa solidification complète, l'angle d'enroulement (15), commençant au point le plus étroit de la fente (4 ; 25), étant au moins de 90° et de préférence de 180 à 210°.
2. Procédé selon la revendication 1, caractérisé en ce que, les tambours (2, 3 ; 22, 23) étant disposés l'un au-dessus de l'autre, on introduir le métal à couler dans la cavité de formage (7) en le faisant couler vers le haut sous un angle ce 5 à 45°, de préférence de 15 à 30° par rapport à l'horizontale.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on maintient la bande coulée (12) autour du tambour inférieur (3 ; 23).
4. Procédé selon la revendication 2 ou 3, caractérisé en ce que l'on introduit le métal à couler à partir d'un réservoir (13) et à travers un dispositif d'amenée (5 ; 30) communiquant avec lui dans la cavité de formage (7 ; 27), de manière que la surface du métal liquide (17) dans le réservoir (13) soit maintenue à un niveau qui n'est que de peu supérieur au point (18) le plus haut à l'entrée de la cavité de formage.
5. Procédé selon une des revendications 1 à 4, caractérisé en ce que les vitesses circonférentielles des surfaces périphériques des deux tambours (2, 3 ; 22, 23), surfaces qui sont en contact avec les grands côtés de la bande (12) en cours de formation, sont inégales et que le rapport de la vitesse circonférentielle V3 de la surface périphérique du tambour (3 ; 23) embrassé, ayant le rayon R3, à la vitesse circonférentielle V2 de la surface périphérique du tambour (2) non embrassé ou entouré par la bande correspond à
Figure imgb0008
où d représente la distance entre les tambours au point le plus étroit (4) de la fente.
6. Dispositif pour la coulée continue de métaux, notamment d'acier, en forme de bande ou de minces brames, comprenant deux tambours refroidis (2, 3 ; 22, 23) à axes parallèles, qui forment une cavité de formage (7 ; 27) du côté de l'entrée du métal à couler dans la fente entre les tambours (2, 3 ; 22, 23), conjointement avec un dispositif d'amenée (5 ; 30), et, du côté par lequel la bande ou barre coulée sort de la fente (4 ; 25), le long de la surface périphérique d'un des tambours, un guide-barre courbe (10), caractérisé en ce que le guide-barre courbe est réalisé, ensemble avec des rouleaux, comme un corset de soutien (10) pour une bande de coulée (12) qui n'est que partiellement solidifiée et qui entoure le tambour (3; 23), à partir de l'endroit le plus étroit (4 ; 25) de la fente entre les tambours, sur un angle d'enroulement (15) d'au moins 90°, de préférence de 180 à 210°.
7. Dispositif selon la revendication 6, caractérisé en ce que les tambours (2, 3 ; 22, 23) sont disposés l'un au-dessus de l'autre et que l'axe (20) du dispositif d'amenée (5 ; 30), dirigé vers le haut, renferme un angle (a) de 5 à 45°, de préférence de 15 à 30°, avec l'horizontale (14) pendant la coulée.
8. Dispositif selon la revendication 7, caractérisé en ce que le dispositif d'amenée (5 ; 30) est disposé basculant, ensemble avec au moins le tambour supérieur (2 ; 22), de manière que l'axe (20) du canal d'amenée (16) puisse être tourné, à la-fin de la coulée, de la position de service à une orientation à peu près horizontale.
9. Dispositif selon la revendication 7, caractérisé en ce que le panier intermédiaire (13) est équipé d'un couvercle (41) étanche au gaz et que l'intérieur du panier est raccordé à une source de pression de gaz dont la pression est réglable.
10. Dispositif selon la revendication 7, caractérisé en ce qu'une pompe électromagnétique (42) est incorporée dans le canal d'amenée (5).
11. Dispositif selon une des revendications 6 à 10, caractérisé en ce que la cavité de formage (27), délimitée par le dispositif d'amenée (30), par deux flancs (24) pour les petits côtés, déplacés en synchronisme avec un tambour (23), par des segments (28, 29) des surfaces périphériques des deux tambours et par le plan transversal de la fente à l'endroit le plus étroit (25), est plus courte sur les petits côtés, dans le sens (31) de l'amenée du métal, qu'au milieu (32) des grands côtés, et que les flancs (24) pour les petits côtés, déplacés en synchronisme avec un tambour (23), recouvrent seulement une partie des petits côtés de la cavité de formage (27).
12. Dispositif selon la revendication 11, caractérisé en ce que la hauteur des flancs (24) pour les petits côtés, déplacés en synchronisme avec un tambour (23), n'est que de peu supérieure à la hauteur de la cavité de formage (27) à son endroit (25) le plus étroit.
13. Dispositif selon la revendication 11 ou 12, caractérisé en ce que le dispositif (30) pour l'amenée du métal possède, sur les petits côtés, des parois (36) en forme de coins, par lesquelles ce dispositif avance dans la cavité de formage jusque dans la zone où les flancs (24) pour les petits côtés, deplacés en synchronisme avec un tambour (23), recouvrent les petits côtés de la cavité de formage sur toute leur hauteur.
14. Dispositif selon une des revendications 6 à 10, caractérisé en ce que la cavité de formage (27), délimitée par le dispositif d'amenée (30), par deux parois stationnaires (38) pour les petits côtés, par des segments (28, 29) des surfaces périphériques des deux tambours et par le plan transversal de la fente à l'endroit le plus étroit (25), est plus courte, sur les petits côtés, dans le sens (31) de l'amenée du métal, qu'au milieu (32) des grands côtés, et que les plaques stationnaires (38) pour les petits côtés recouvrent seulement une partie des petits côtés de la cavité de formage (27) et s'étendent en même temps au-delà de l'endroit le plus étroit (25) de la cavité de formage (27).
15. Dispositif selon une des revendications 1 à 14, caractérisé en ce que la longueur (8 respectivement 28, 29) de la cavité de formage s'etend sur au moins un arc de 20° du pourtour des tambours.
EP85101821A 1984-03-01 1985-02-20 Procédé et dispositif pour la coulée continue des métaux entre deux tambours refroidis à axes parallèles Expired EP0154250B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101821T ATE33774T1 (de) 1984-03-01 1985-02-20 Verfahren und vorrichtung zum kontinuierlichen giessen von metallen zwischen zwei gekuehlten achsparellelen trommeln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH998/84A CH666842A5 (de) 1984-03-01 1984-03-01 Verfahren und vorrichtung zum kontinuierlichen giessen von metallen in form von band zwischen zwei gekuehlten achsparallelen trommeln.
CH998/84 1984-03-01

Publications (3)

Publication Number Publication Date
EP0154250A2 EP0154250A2 (fr) 1985-09-11
EP0154250A3 EP0154250A3 (en) 1986-06-04
EP0154250B1 true EP0154250B1 (fr) 1988-04-27

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Application Number Title Priority Date Filing Date
EP85101821A Expired EP0154250B1 (fr) 1984-03-01 1985-02-20 Procédé et dispositif pour la coulée continue des métaux entre deux tambours refroidis à axes parallèles

Country Status (13)

Country Link
US (1) US4648439A (fr)
EP (1) EP0154250B1 (fr)
JP (1) JPS60203346A (fr)
KR (1) KR920002403B1 (fr)
AT (1) ATE33774T1 (fr)
AU (1) AU576349B2 (fr)
BR (1) BR8500888A (fr)
CA (1) CA1234473A (fr)
CH (1) CH666842A5 (fr)
DE (1) DE3562320D1 (fr)
ES (1) ES541240A0 (fr)
IN (1) IN164781B (fr)
ZA (1) ZA851399B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH665370A5 (de) * 1984-04-06 1988-05-13 Concast Service Union Ag Verfahren und vorrichtung zum kontinuierlichen giessen von metall in einen formhohlraum mit im kreislauf sich bewegenden gekuehlten waenden.
GB2198976B (en) * 1986-12-19 1990-10-17 Davy Mckeen Roll caster
US4749024A (en) * 1987-09-28 1988-06-07 Battelle Development Corporation Direct cast strip thickness control
DE3802202A1 (de) * 1988-01-26 1989-08-03 Voest Alpine Ag Verfahren zum stranggiessen eines duennen bandes oder einer duennen bramme sowie vorrichtung zur durchfuehrung des verfahrens
DE3822656A1 (de) * 1988-07-05 1990-01-11 Karsten Schenk Verfahren zum kontinuierlichen giessen von metallbaendern und vorrichtung zur durchfuehrung des verfahrens
FR2633852B1 (fr) * 1988-07-06 1991-04-26 Siderurgie Fse Inst Rech Procede et dispositif de coulee continue de produits metalliques minces
FR2649340B1 (fr) * 1989-07-04 1994-03-11 Irsid Procede et dispositif de coulee continue entre cylindres de produits metalliques minces aptes au laminage a froid direct
FR2684576A1 (fr) * 1991-12-04 1993-06-11 Usinor Sacilor Dispositif de coulee continue d'une bande mince metallique entre cylindres.

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE113573C (fr) *
FR986078A (fr) * 1949-03-02 1951-07-26 Coulee Continue Des Metaux Dispositif de coulée continue pour métaux ferreux et non ferreux
US2693012A (en) * 1950-09-08 1954-11-02 Gen Motors Corp Method and apparatus for manufacturing sheet material
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
FR2091851B1 (fr) * 1969-12-26 1973-05-25 Namy Philippe
US3730254A (en) * 1970-12-18 1973-05-01 Creusot Loire Roller pair type continuous casting apparatus
JPS5938062B2 (ja) * 1978-03-15 1984-09-13 日本碍子株式会社 金属の連続鋳造法
JPS57165162A (en) * 1981-04-01 1982-10-12 Sumitomo Metal Ind Ltd Supplying method for molten steel in belt caster
JPS58179545A (ja) * 1982-04-14 1983-10-20 Ishikawajima Harima Heavy Ind Co Ltd 帯板連続鋳造装置

Also Published As

Publication number Publication date
ZA851399B (en) 1985-10-30
IN164781B (fr) 1989-06-03
EP0154250A2 (fr) 1985-09-11
KR850007012A (ko) 1985-10-30
AU576349B2 (en) 1988-08-25
CA1234473A (fr) 1988-03-29
CH666842A5 (de) 1988-08-31
DE3562320D1 (en) 1988-06-01
ATE33774T1 (de) 1988-05-15
KR920002403B1 (ko) 1992-03-23
BR8500888A (pt) 1985-10-15
EP0154250A3 (en) 1986-06-04
JPS60203346A (ja) 1985-10-14
US4648439A (en) 1987-03-10
ES8603306A1 (es) 1985-12-16
AU3925385A (en) 1985-09-05
ES541240A0 (es) 1985-12-16

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