EP3705202B1 - Transformation d'une installation de coulée continue pour billettes et blooms - Google Patents

Transformation d'une installation de coulée continue pour billettes et blooms Download PDF

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Publication number
EP3705202B1
EP3705202B1 EP20153887.3A EP20153887A EP3705202B1 EP 3705202 B1 EP3705202 B1 EP 3705202B1 EP 20153887 A EP20153887 A EP 20153887A EP 3705202 B1 EP3705202 B1 EP 3705202B1
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EP
European Patent Office
Prior art keywords
strand
continuous casting
extraction unit
mould
unit
Prior art date
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Active
Application number
EP20153887.3A
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German (de)
English (en)
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EP3705202A1 (fr
Inventor
Denijel Burzic
Jeffrey Morton
August Pühringer
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.)
Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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Publication date
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Publication of EP3705202A1 publication Critical patent/EP3705202A1/fr
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/043—Curved moulds
    • 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
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1284—Horizontal removing
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting

Definitions

  • the present invention relates to the technical field of continuous casting.
  • the present invention relates to a method for converting a continuous casting installation for the continuous casting of a strand with a billet or bloom cross section.
  • the invention relates to the continuous casting plant converted by the method for converting a continuous casting plant for continuous casting of a strand with a billet or bloom cross section for continuous casting of a strand with a billet or bloom cross section.
  • the DE 10236368 A1 discloses a continuous casting plant for continuously casting a strand with a billet cross section, comprising a mold for casting liquid steel into the strand, an arcuate strand guide with a plurality of strand guide rollers arranged on both sides of the strand, the strand being cooled by cooling nozzles, and a soft reduction unit, wherein each soft-reduction unit has an adjustment device and a strand guide roller, which can be adjusted by the adjustment device, for reducing the thickness of the strand.
  • the state of the art does not show how the conversion of an existing continuous casting plant for the continuous casting of a strand with a billet or bloom cross section can be carried out with regard to low conversion costs, short conversion times and a high reusability of existing components and, moreover, the metallurgical quality of the produced strands can be increased out.
  • the object of the invention is to find a method for converting an existing continuous casting plant for continuously casting a strand with a billet or bloom cross section, so that the conversion can be carried out with low conversion costs, a short conversion time and a high degree of reusability of existing components.
  • the metallurgical quality of the strands produced is to be increased.
  • the conversion method according to the invention can increase the productivity of the continuous casting installation by increasing the casting speed, while the mold, at least parts of the strand guide, the pull-out unit and the outlet area can remain completely unchanged. Only the flame cutting machine is shifted horizontally in the casting direction, so that at least one soft-reduction unit can be used in the resulting free space between the last extraction unit in the casting direction and the offset flame-cutting machine.
  • the soft reduction unit presses the two shells of the partially solidified strand together, which improves the internal quality of the strand.
  • at least one strand guide roller of the soft reduction unit is placed against the strand by an adjusting device (typically a hydraulic cylinder), as a result of which the thickness of the strand is reduced. If, in addition to increasing the casting speed, the cross-section of the billet or bloom strand is also increased, the mold and the strand guide must be adapted to the changed cross-section.
  • a first insulation tunnel for thermal insulation of the strand is used between the rear end of the strand guide or the last segment of the strand guide in the casting direction and the pull-out unit.
  • the solidification point of the strand is shifted in the direction of casting, so that the strand enters the exit zone at a higher temperature.
  • the casting speed and/or the cooling intensity of the converted continuous casting plant is adjusted by a plant control system so that the solidification point of the strand is between the axis of rotation of the roller of the first soft reduction unit and the axis of rotation of the roller of the last soft reduction unit located.
  • the change in cross section of the strand in the soft reduction units can take place using moderate forces.
  • the solidification point of the strand is in the middle of the last soft reduction unit.
  • both the rear end of the strand guide or the last segment in the casting direction and a first extraction unit is a first isolation tunnel and A second insulation tunnel for thermal insulation of the strand is arranged between the last extension unit and the first soft reduction unit.
  • a radius of curvature R of the curved strand guide is between 8 m and 12 m, preferably between 9 m and 11 m.
  • the converted continuous casting plant has between 4 and 6 soft reduction units.
  • a continuous casting plant 1 for the continuous casting of strands with billet or bloom cross sections is shown schematically.
  • a ladle turret with one ladle is shown in the upper left area of the figure.
  • the continuous casting plant 1 is supplied with molten steel by means of the ladle via a crane shown at the top. From the ladle, the molten steel is conducted in and of itself in a known manner via a shroud tube into the distributor and from there typically via a dip tube (engl. SEN) filled in the mold 2.
  • a constant meniscus and a partially solidified strand with a liquid core and two solidified strand shells form in the cooled mold 2 .
  • casting powder is applied to the meniscus and the mold 2 is oscillated essentially in the vertical direction by means of an oscillating unit 2a.
  • the partially solidified strand is supported and guided in the curved strand guide 3 following the mold 2 and further cooled by cooling nozzles.
  • In the figure 1 is a segment for supporting and guiding the strand 4 with several strand guide rollers arranged on both sides of the strand.
  • the curved strand is pulled out of the mold 2 by the pull-out unit 5 with at least one driven strand guide roller, here two or three pairs of driven pull-out rollers, and straightened in the horizontal direction.
  • a dummy bar pull-out unit 13 is present, which can accommodate the also arc-shaped dummy bar after the continuous casting installation 1 has been cast on.
  • the strand is then transported on a roller table to the flame cutting machine 6 and cut there into strand sections.
  • the strand sections are either deposited in the discharge area 7 or further processed by the discharge area 7 downstream rolling mills into wires, profiles or similar products.
  • Such continuous casting plants 1 are inexpensive to purchase and operate, but are unable to keep up with modern continuous casting plants either in terms of the productivity of the plant or the quality of the strands produced. Accordingly, there is a need to rebuild existing continuous casters in order to increase the quality of the strands produced and/or the productivity of the continuous caster.
  • the solidification point of the strand in the strand guide shifts backwards in the material direction at higher casting speeds, i.e. in the direction of the outlet area 7.
  • either the strand would have to be cooled more intensively by strand cooling or the Arc radius of the strand guide can be increased.
  • both measures are problematic because on the one hand more intensive strand cooling degrades the quality of the strand and on the other hand a larger arc radius increases the overall height of the continuous casting plant, which is very problematic in an existing hall with a given height.
  • the technical problem is solved in that the flame cutting machine 6 is moved backwards in the casting direction, so that a free space F is created between the last extension unit 5 and the displaced flame cutting machine 6, and at least one soft reduction unit 8 is installed in the free space F , wherein each soft reduction unit 8 has an adjustment device 9 and a strand guide roller 10, which can be adjusted by the adjustment device, for reducing the thickness of the strand.
  • the converted continuous caster 1 is in figure 2 as well as in further details in the Figures 3 to 5 shown.
  • the flame cutting machine 6 is displaced in the material flow direction in the direction of the outlet area 7 .
  • a free space F (see figure 2 ) formed between the rear end of the extension unit 5 and the front end of the flame cutting machine 6.
  • the soft reduction unit 8 or several such units 8a . . . 8e is inserted into this free space F.
  • the soft reduction units 8 are typically inserted by a crane, as is the case with the soft reduction units 8b, 8c in figure 4 implied.
  • first and second insulation tunnels 11, 12 can be installed between the last segment 4 of the strand guide 3 and the extraction unit 5 and between the extraction unit 5 and the soft reduction unit 8 (please refer figure 2 ).
  • the solidification point of the converted continuous caster is in the area between the first soft reduction unit 8a and the last soft reduction unit 8e. This is ensured during operation by a system control.
  • the mold 2 is designed as a curved mold and the radius of the mold 2 and the radius R of the curved guide 3 are between 8 m and 12 m, preferably between 9 m and 11 m.
  • each reduction unit 8 has an adjustment device 9 (here a hydraulic cylinder) which can move an upper strand guide roller 10b in the direction of a lower strand guide roller 10a. By placing the upper strand guide roller 10b on the strand, which is not shown, the thickness of the strand is reduced. All reduction units 8a...8e are constructed identically and are connected to the foundation via a base frame. Further details on soft reduction units are not necessary, since these are, for example, from the WO 2009/144107 A1 are known.

Landscapes

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

Claims (11)

  1. Procédé pour la transformation d'une installation de coulée continue (1) pour la coulée continue d'une barre avec un profil de billette ou de bloom, dans lequel l'installation de coulée continue (1) comporte avant la transformation :
    - une coquille (2) pour la coulée d'acier liquide en une barre avec un profil de billette ou de bloom et une unité oscillante (2a) pour l'oscillation de la coquille (2) ;
    - un guide de barre arqué (3) pour le soutien, le guidage et le refroidissement de la barre avec plusieurs rouleaux de guidage de barre disposés des deux côtés de la barre, dans lequel la barre est refroidie dans le guide de barre (3) par des buses de refroidissement ;
    - au moins une unité d'extraction (5) avec chacune un rouleau de guidage de barre entraîné, ajustable sur la barre, pour l'extraction de la barre de la coquille (2) ;
    - une machine d'oxycoupage (6) pour la découpe de la barre en sections de barre ; et
    - une zone de sortie (7) pour le dépôt des sections de barre ;
    comprenant les étapes de procédé :
    i) décalage de la machine d'oxycoupage (6) dans la direction de coulée, de telle sorte qu'il en résulte un espace libre (F) entre la dernière unité d'extraction (5) et la machine d'oxycoupage (6) décalée ;
    ii) montage d'au moins une unité de réduction douce (8, 8a...8e) dans l'espace libre (F), dans lequel chaque unité de réduction douce (8) comprend un dispositif d'ajustement (9) et un rouleau de guidage de barre (10) ajustable par le dispositif d'ajustement pour la réduction de l'épaisseur de la barre.
  2. Procédé selon la revendication 1, caractérisé en ce qu'entre l'extrémité arrière du guide de barre (3) et l'unité d'extraction (5), un premier tunnel d'isolation (11) est utilisé pour l'isolation thermique de la barre.
  3. Procédé selon la revendication 2, caractérisé en ce qu'entre l'unité d'extraction (5) et la première unité de réduction douce (8, 8a) dans la direction de coulée, un deuxième tunnel d'isolation (12) est utilisé pour l'isolation thermique de la barre.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la vitesse de coulée et/ou l'intensité de refroidissement de l'installation de coulée continue transformée sont ajustées par un réglage de l'installation, de telle sorte que le point de solidification complète de la barre se situe entre la première unité de réduction douce (8a) et la dernière unité de réduction douce (8e).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une unité d'extraction de fausse barre (13) disposée après la dernière unité d'extraction (5) est réutilisée après la transformation de l'installation de coulée continue.
  6. Procédé selon la revendication 5, caractérisé en ce que l'unité d'extraction de fausse barre (13) n'est pas décalée lors de la transformation.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que la barre laisse la coquille (2) de la machine de coulée continue (1) incurvée avec un rayon de courbure (R1).
  8. Procédé selon la revendication 8, caractérisé en ce que le rayon de courbure (R1) de la barre dans la coquille (2) vérifie 0,9.R1 ≤ R ≤ 1,1.R1, de préférence R = R1, dans lequel R est le rayon de courbure du guide de barre (3).
  9. Installation de coulée continue (1) pour la coulée continue d'une barre avec un profil de billette ou de bloom fabriquée par l'intermédiaire d'un procédé pour la transformation d'une installation de coulée continue (1) pour la coulée continue d'une barre avec un profil de billette ou de bloom selon l'une des revendications précédentes, comportant :
    - une coquille (2), de préférence une coquille arquée, pour la coulée d'acier liquide en une barre avec un profil de billette ou de bloom et une unité oscillante (2a) pour l'oscillation de la coquille (2) ;
    - un guide de barre arqué (3) pour le soutien, le guidage et le refroidissement de la barre avec plusieurs rouleaux de guidage de barre disposés des deux côtés de la barre, dans laquelle la barre est refroidie dans le guide de barre (3) par des buses de refroidissement ;
    - au moins une unité d'extraction (5) avec chacune un rouleau de guidage de barre entraîné, ajustable sur la barre, pour l'extraction de la barre de la coquille (2), dans laquelle l'unité d'extraction (5) est disposée après l'extrémité arrière du guide de barre arqué (3) ;
    - une unité d'extraction de fausse barre (13) pour l'extraction d'une fausse barre de la coquille (2) ;
    - au moins une unité de réduction douce (8) avec un dispositif d'ajustement (9) et un rouleau de guidage de barre (10) ajustable par le dispositif d'ajustement pour la réduction de l'épaisseur de la barre, dans laquelle l'au moins une unité de réduction douce (8) est disposée dans un espace libre (F) entre la dernière unité d'extraction (5) restant dans sa position initiale et la nouvelle position, décalée dans la direction de sortie de la barre, de la machine d'oxycoupage (6) ;
    - une machine d'oxycoupage (6) pour la découpe de la barre en sections de barre ; et
    - une zone de sortie (7) pour le dépôt des sections de barre,
    dans laquelle, entre l'extrémité arrière du guide de barre (3) et une première unité d'extraction (5), est disposé un premier tunnel d'isolation (11) pour l'isolation thermique de la barre, et entre la dernière unité d'extraction (5) et la première unité de réduction douce (8, 8a), est disposé un deuxième tunnel d'isolation (12) pour l'isolation thermique de la barre.
  10. Installation de coulée continue (1) selon la revendication 9, caractérisée en ce qu'un rayon de courbure (R) du guide de barre arqué vérifie 12 m ≥ R ≥ 8 m, de préférence 11 m ≥ R ≥ 9 m.
  11. Installation de coulée continue (1) selon l'une des revendications 9 à 10, caractérisée en ce que l'installation de coulée continue (1) transformée comprend entre 4 et 6 unités de réduction douce (8, 8a...8e).
EP20153887.3A 2019-03-06 2020-01-27 Transformation d'une installation de coulée continue pour billettes et blooms Active EP3705202B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50173/2019A AT522265B1 (de) 2019-03-06 2019-03-06 Umbau einer stranggiessanlage für knüppel- oder vorblockstränge

Publications (2)

Publication Number Publication Date
EP3705202A1 EP3705202A1 (fr) 2020-09-09
EP3705202B1 true EP3705202B1 (fr) 2022-01-19

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EP (1) EP3705202B1 (fr)
CN (1) CN111659863B (fr)
AT (1) AT522265B1 (fr)

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CN112355256B (zh) * 2020-11-30 2024-07-09 中冶赛迪工程技术股份有限公司 一种超高速小方坯连铸装置及生产方法
CN114799106B (zh) * 2022-06-01 2023-07-25 娄底职业技术学院 一种基于连铸结晶器液位控制的连铸机

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EP3437759B1 (fr) * 2017-08-04 2022-10-12 Primetals Technologies Austria GmbH Coulée continue d'une barre métallique

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Publication number Publication date
AT522265A1 (de) 2020-09-15
EP3705202A1 (fr) 2020-09-09
CN111659863A (zh) 2020-09-15
AT522265B1 (de) 2021-12-15
CN111659863B (zh) 2024-04-02

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