EP0160835B1 - Procédé et dispositif pour la coulée continue de métal dans une lingotière à parois refroidies animées d'un mouvement circulaire - Google Patents

Procédé et dispositif pour la coulée continue de métal dans une lingotière à parois refroidies animées d'un mouvement circulaire Download PDF

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Publication number
EP0160835B1
EP0160835B1 EP85103986A EP85103986A EP0160835B1 EP 0160835 B1 EP0160835 B1 EP 0160835B1 EP 85103986 A EP85103986 A EP 85103986A EP 85103986 A EP85103986 A EP 85103986A EP 0160835 B1 EP0160835 B1 EP 0160835B1
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EP
European Patent Office
Prior art keywords
cooled
walls
metal
narrow
wide
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
EP85103986A
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German (de)
English (en)
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EP0160835A1 (fr
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.)
CESSIONE;CLECIM, DAVY (DISTINGTON) LIMITED
Original Assignee
Concast Service Union AG
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Publication date
Application filed by Concast Service Union AG filed Critical Concast Service Union AG
Publication of EP0160835A1 publication Critical patent/EP0160835A1/fr
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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

Definitions

  • the invention relates to a process for the continuous casting of metal, in particular steel, in the form of strips or thin slabs, the molten metal being poured between four cooled walls moving in the casting direction using a feed device and a casting drum jacket cools the first broad side of the band forming in the mold cavity, a second cooled wall cools the other broad side of the band forming and two Schmais sidewalls are provided which move with the first or second cooled wall and cool the narrow sides of the substantially rectangular band which forms one of the two broad side walls engages between the narrow side walls, and on a device for carrying out the method.
  • a method for the continuous casting of essentially rectangular steel strips is known.
  • the molten metal is poured between two rotating casting drums using a ceramic feed device.
  • a first casting drum is provided with a recess on its outer surface and forms a broad side and two narrow sides of the mold cavity.
  • the second casting drum which engages along the mold cavity length between the narrow sides of the first casting drum, results in the second broad side of the mold cavity.
  • the recess in one casting drum would have to be very deep. Between the engaging roller and the narrow side walls, a certain gap joint is inevitable to prevent friction, wear, etc., or due to thermal expansion. In the known casting process, it can therefore not be prevented that liquid steel penetrates into this gap joint, which solidifies in the form of springs or eyebrows cast on parallel to the narrow sides. These springs are connected to the strand skin of the broad side of the band which is formed at the same time. They prevent the drum from shrinking or becoming detached due to the cooling of the broadside. This leads to strand defects, in particular to cracks or breakthroughs, which lead to the casting being stopped immediately.
  • the invention has for its object to prevent the shortcomings shown in strip casting systems with high throughput according to the preamble.
  • the formation of eyebrows and feathers protruding parallel to the narrow sides over the broad side is to be prevented, thereby avoiding cracks in the strand material, breakthroughs and other casting errors.
  • the cast metal is strongly cooled before reaching the contact surface on the narrow side in the gap between the drum engaging on a broad side and the extension of the feed device, and a thin metal layer solidifies continuously.
  • the further metal supply for filling the gap gradually expanding towards the narrow side along the uncooled extension of the ceramic metal supply device is maintained.
  • the flowing metal gives off part of its heat to the drum via the already solidified layer, whereby on the one hand the already solidified layer continues to grow and on the other hand the toughness of the metal running along it increases. This prevents liquid metal from penetrating the gap between the engaging drum shell and the narrow side flanks.
  • the broad side crust has solidified up to the narrow side wall, it increases in thickness and the solidification of a crust also begins from the narrow side wall already cooled there. There is therefore no longer any risk of burrs or feathers forming.
  • the contact area and the corresponding gap opening in the casting direction can be enlarged after an additional identifier.
  • a control of the solidification of the narrow sides of the band or a thin slab in the mold cavity will he after an additional feature It is sufficient if, after the metal has flowed into the mold cavity, contact between the cooled narrow sides of the mold cavity and the cast metal is initially prevented on a first partial length of the mold cavity, is granted on a second partial length on a contact surface, the height of which is only a fraction of the respective distance corresponds to both broadside cooling walls and is granted over a third partial length on a contact surface, the height of which corresponds to the full distance between the two broadside cooling walls in the mold cavity.
  • a corresponding device for carrying out this method describes the features of claim 6. With this method and with this device, the strand quality on the narrow sides can be improved and the wear on the drums can be reduced.
  • the dimensioning of both the gap opening and the flow length of the metal in the gap itself must be adapted to the casting speed, the casting format, the casting metal and the cooling capacity of the cooling wall. According to another characteristic, a gap opening of 1/2 - 1/12 of the respective cooling wall distance on the broad sides is recommended as the mean value.
  • a continuous caster for strips and thin slabs with mold walls moved in a circuit which essentially consists of two pouring streams 2 and 3 and a feed device 4.
  • a cooling wall in the form of a band which is moved in a circuit could also be used. Molten metal is fed from a container 5 in the casting direction 6 between the drums 2, 3. Cooled walls 7, 8, 9 of the drums 2, 3 form the mold in the mold cavity 10.
  • a chain 12, indicated by dash-dotted lines, can be continued, cooled and, if necessary, continued straight after the exit from the narrowest gap 14, which also represents the end of the mold cavity 10, in a straight line or curved manner, as shown in FIG.
  • the drums 2 and 3 are only hinted at and the feed device 4 is only partially shown.
  • the drum 2 forms for example a first 7, the drum 3 a second cooled broad side wall 8 and the narrow side walls 9, 9 '.
  • the mold cavity 10 begins at the surface 20 of the feed device 4 and ends at the dash-dotted line 21, which coincides with the thin gap between the drums 2 and 3.
  • the mold cavity 10 is delimited on the side first by extensions 23, 23 'of the feed device 4 arranged on both sides and then by the cooled narrow side walls 9, 9'.
  • the drum 2 engages over a partial length 24 of the mold cavity length 25 between the narrow side walls 9, 9 '.
  • the broad side walls 7 and 8 first cool to e; .. he width 26 of the two broad sides of the strand being formed.
  • contact of the liquid metal with the cooled side flanks 9, 9 'of the drum 3 is initially only granted along a contact surface 27 which corresponds to only a fraction of the respective distance between the two broad side walls 7, 8.
  • the metal is specifically cooled before reaching the contact surface 27 in a gap between the extensions 23, 23 'of the feed device 4 and the wall 7 of the drum 2.
  • the cross section of the gap opening 11 (FIGS. 5, 6), which results from shoulders 31 on the extensions 23, 23 ', corresponds essentially to the contact surface 27.
  • the contact surface 27 and the corresponding gap opening 11 increase in the casting direction 6.
  • the gap opening 11 is usually 1/12 - 1/2 of the respective cooling wall distance between the broad sides, depending on the strip thickness and casting speed.
  • the mold cavity 10 is divided into three partial lengths 33, 34, 35. After the metal flows from a feed channel 32 into the mold cavity 10, contact between the cooled narrow side wall 9 and the cast metal is prevented over the first partial length 33.
  • the metal flows through the gap opening 11 against the contact surface 27.
  • the gap opening 11 or the shoulder 31 is advantageously enlarged towards the feed channel.
  • the boundary edge 39 forms an angle ⁇ of, for example, 45 ° with the casting direction 6.
  • contact between the cast metal and the cooled narrow sides 9 is granted on a surface which corresponds to the full distance between the two broad side walls in the mold cavity.
  • the premature solidification of the cast metal in the gap opening along the broad side wall 7 prevents penetration of liquid metal into gap joints 40 (FIGS. 6, 7) parallel to the narrow side, in which springs or burrs could otherwise form, which lead to the disadvantages mentioned.
  • the casting direction is shown horizontally in the examples. However, any other casting direction can be used, in particular it is advantageous to pour obliquely upwards.

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

Claims (6)

1. Procédé pour la coulée continue du métal, en particulier de l'acier, sous forme de bandes et de brames minces, dans lequel on coule le métal en fusion entre quatre parois refroidies (7, 8, 9, 9') animées d'un mouvement de circulation dans le sens de la coulée (6) avec emploi d'un dispositif d'amenée (4) et dans lequel une surface latérale d'un tambour de coulée refroidit un premier grand côté de la bande qui se forme dans l'espace creux de moulage (10), dans lequel une seconde paroi refroidie (8) refroidit l'autre grand côté de la bande qui se forme et dans lequel sont prévues deux parois (9, 9') de petit côté qui sont entraînées avec la première ou avec la seconde paroi refroidie (7, 8) et qui refroidissent les petits côtés de la bande sensiblement rectangulaire qui se forme, et dans lequel l'une des deux parois (7) de grand côté se loge entre les parois (9, 9') de petit côté, caractérisé en ce qu'après l'entrée du métal en fusion dans l'espace creux de moulage (10), le contact entre les petits côtés refroidis (9, 9') de l'espace creux de moulage (10) et le métal liquide n'est tout d'abord autorisé que sur une surface de contact (27) dont la hauteur ne représente qu'une fraction de la distance respective des deux parois refroidies (7, 8) de grand côté; et en ce qu'avant d'atteindre la surface de contact (27) le métal est refroidi dans un passage entre le dispositif d'amenée (4) et la paroi (7) de grand côté qui se loge entre les parois de petit côté, la section du passage (11) correspondant essentiellement à la surface de contact (27).
2. Procédé selon la revendication 1, caractérisé en ce que la surface de contact (27) et le passage correspondant (11) vont en croissant dans le sens de la coulée (6).
3. Procédé selon une des revendications 1 ou 2, caractérisé en ce qu'après l'entrée du métal en fusion dans l'espace creux de moulage (10), le contact entre les petits côtés refroidis (9, 9') de l'espace creux de moulage ( 10) et le métal en fusion est tout d'abord interdit sur une première longueur partielle (33) de l'espace creux de moulage (10), puis autorisé, sur une seconde longueur partielle (34), sur une surface de contact (27) dont la hauteur ne correspond qu'à une fraction de la distance respective des deux parois refroidies (7, 8) de petit côté et autorisé, sur une troisième longueur partielle (35), sur une surface de contact dont la hauteur correspond à la distance totale des deux parois refroidies (7, 8) de petits côtés dans l'espace creux de moulage (10).
4. Dispositif pour la coulée continue du métal, en particulier de l'acier, sous forme de bandes ou de brames minces, avec emploi de deux parois refroidies (7, 8) animées d'un mouvement de circulation dans le sens de la coulée et d'un dispositif d'amenée (4), la première paroi refroidie (7) représentant l'une des parois refroidies de grand côté de l'espace creux de moulage et la seconde paroi refroidie présentant un évidement correspondant à peu près au profil de la bande et formant une paroi refroidie (8) de grand côté et deux parois refroidies (9, 9') de petit côté, caractérisé en ce que le dispositif d'amenée (4) présente, dans l'espace creux de moulage (10), dans le sens de la coulée (6), des prolongements (23, 23') qui sont disposés le long des deux petits côtés refroidis (9, 9') et forment, avec la paroi refroidie (7) qui se loge dans l'évidement, un passage (11) qui garantit un écoulement de métal liquide.
5. Dispositif selon la revendication 4, caractérisé en ce que le passage (11) se monte à 1/2 - 1/12 de la distance respective de paroi de refroidissement des grands côtés.
6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que le dispositif d'amenée (4) présente, dans l'espace creux de moulage (10), dans le sens de la coulée (6), des prolongements (23, 23') qui, sur une première longueur partielle (33) de l'espace creux de moulage (10), recouvrent complètement les deux petits côtés refroidis (9, 9') et, sur une seconde longueur partielle (34), recouvrent partiellement les deux parois refroidies de petit côté (9. 9').
EP85103986A 1984-04-06 1985-04-02 Procédé et dispositif pour la coulée continue de métal dans une lingotière à parois refroidies animées d'un mouvement circulaire Expired EP0160835B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1738/84A CH665370A5 (de) 1984-04-06 1984-04-06 Verfahren und vorrichtung zum kontinuierlichen giessen von metall in einen formhohlraum mit im kreislauf sich bewegenden gekuehlten waenden.
CH1738/84 1984-04-06

Publications (2)

Publication Number Publication Date
EP0160835A1 EP0160835A1 (fr) 1985-11-13
EP0160835B1 true EP0160835B1 (fr) 1987-12-09

Family

ID=4217425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103986A Expired EP0160835B1 (fr) 1984-04-06 1985-04-02 Procédé et dispositif pour la coulée continue de métal dans une lingotière à parois refroidies animées d'un mouvement circulaire

Country Status (10)

Country Link
US (1) US4582119A (fr)
EP (1) EP0160835B1 (fr)
JP (1) JPH0677790B2 (fr)
AU (1) AU585218B2 (fr)
BR (1) BR8501596A (fr)
CA (1) CA1228969A (fr)
CH (1) CH665370A5 (fr)
DE (1) DE3561133D1 (fr)
IN (1) IN163513B (fr)
ZA (1) ZA852474B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH664916A5 (de) * 1984-04-18 1988-04-15 Concast Service Union Ag Vorrichtung zum seitlichen abschliessen eines formhohlraumes mit im wesentlichen rechteckigem querschnitt in einer stranggiessanlage.
GB2198976B (en) * 1986-12-19 1990-10-17 Davy Mckeen Roll caster

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3964963A (en) * 1972-12-27 1976-06-22 Martin Marietta Aluminum Inc. Apparatus for producing continuous cast metallic sheet with patterned surface
DE2926181C2 (de) * 1978-06-29 1986-02-13 Hitachi, Ltd., Tokio/Tokyo Vorrichtung zum Stranggießen
JPS6035220B2 (ja) * 1981-01-19 1985-08-13 日本鋼管株式会社 薄板製造方法及びその装置
JPS57142748A (en) * 1981-02-27 1982-09-03 Hitachi Ltd Molding device for thin plate
CH666842A5 (de) * 1984-03-01 1988-08-31 Concast Service Union Ag Verfahren und vorrichtung zum kontinuierlichen giessen von metallen in form von band zwischen zwei gekuehlten achsparallelen trommeln.

Also Published As

Publication number Publication date
AU4057985A (en) 1985-10-10
CH665370A5 (de) 1988-05-13
IN163513B (fr) 1988-10-01
CA1228969A (fr) 1987-11-10
AU585218B2 (en) 1989-06-15
DE3561133D1 (en) 1988-01-21
JPS60231557A (ja) 1985-11-18
US4582119A (en) 1986-04-15
BR8501596A (pt) 1985-12-03
JPH0677790B2 (ja) 1994-10-05
ZA852474B (en) 1985-11-27
EP0160835A1 (fr) 1985-11-13

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