EP3703883B1 - Installation de coulée continue à réglage de cylindres individuels - Google Patents

Installation de coulée continue à réglage de cylindres individuels Download PDF

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Publication number
EP3703883B1
EP3703883B1 EP18782420.6A EP18782420A EP3703883B1 EP 3703883 B1 EP3703883 B1 EP 3703883B1 EP 18782420 A EP18782420 A EP 18782420A EP 3703883 B1 EP3703883 B1 EP 3703883B1
Authority
EP
European Patent Office
Prior art keywords
strip
rollers
strand
continuous casting
adjustable
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.)
Active
Application number
EP18782420.6A
Other languages
German (de)
English (en)
Other versions
EP3703883A1 (fr
Inventor
Thomas Heimann
Uwe Plociennik
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.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3703883A1 publication Critical patent/EP3703883A1/fr
Application granted granted Critical
Publication of EP3703883B1 publication Critical patent/EP3703883B1/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
    • B22D11/128—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
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • 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
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell

Definitions

  • the Figure 1 shows a schematic diagram of a known continuous casting plant, the design of which is referred to as a "vertical bending plant" because the cast strand is first guided vertically downwards by means of a strand guide, then deflected along a bend and transported horizontally.
  • the structure and operation of the continuous casting plant of Figure 1 In detail: The liquid metal to be cast is fed into a mold 1, for example from a pouring ladle (not shown).
  • the mold 1 which can be designed as a funnel mold, brings the molten metal into the desired slab shape.
  • the not yet fully solidified strand S emerges vertically downwards from the mold 1 and is then guided vertically downwards along the strand guide 2 while gradually cooling.
  • the strand guide 2 has two structurally similar curved segments 21 and 22, which form a bending area of the strand guide 2.
  • the segments 21 and 22 have rollers 24 arranged in pairs to transport the strand S in a conveying direction F.
  • the two segments 21 and 22 can, if necessary, be replaced by a single segment equipped with pairs of rollers to transport and bend the strand emerging from the mold before it enters the straightening driver.
  • the strand cannot be arbitrarily thin when leaving the mold.
  • the distance between the dip tube and the mold wall must not be too small to allow the liquid metal to circulate in the mold.
  • the dip tube itself must have a minimum diameter to avoid clogging too quickly.
  • the cold strand which is used to cast the system from the The strand, which is transported from the outlet side to the mold, has a minimum thickness that generally cannot be less than 40 mm.
  • the fact that the strand cannot be cast as thin as desired for all these reasons means that the rolling mill cannot simply be designed more compactly, because the rolling mill must be capable of rolling the slabs cast with a certain minimum thickness to the desired target thickness.
  • the US 5,853,043 A describes a continuous casting plant with adjustable rollers in the strand guide.
  • EP 2 441 538 A1 describes a continuous casting device with dynamic strand thickness reduction.
  • WO 02/090019 A1 describes a method and apparatus for the continuous casting of ingots, slabs or thin slabs.
  • DE 196 39 302 A1 describes a method and apparatus for producing thin slabs on a continuous casting plant.
  • EP 0 350 431 A2 describes a continuous casting process for producing slabs with a reduced thickness compared to the as-cast state.
  • the DE3234546A1 describes a continuous casting plant with segments with adjustable distance between the guideways to produce different strand cross-section formats.
  • An object of the invention is to improve a continuous casting plant of the type described above, in particular to provide a continuous casting plant (analogous process) which, while maintaining functionality, can be designed to be particularly compact and/or operated in an energy-saving manner and/or has a high level of operational reliability and/or casting quality.
  • the continuous casting plant according to the invention is used for casting a strand in the molten metallurgy sector, i.e., a strand made of a metal, in particular a metal alloy, preferably steel.
  • the plant is preferably designed as a vertical bending plant, but it can also have a different design.
  • the plant can also be designed as a bending plant or a vertical slab plant.
  • the continuous casting plant has a mold, which can be designed as a hopper mold. The mold is configured to discharge the strand, preferably vertically downwards, as seen in the direction of gravity.
  • the molten metal to be cast is fed into the mold, and the mold forms it into the desired strand or slab shape by discharging the not yet fully solidified strand from a correspondingly shaped outlet opening of the mold.
  • Adjacent to the mold is a strand guide, which has several rollers arranged in pairs for transporting the strand in a conveying direction.
  • the rollers, arranged in pairs each form a gap and, in total, a gap path through which the strand passes in the conveying direction.
  • one or more of the rollers of the strand guide can be adjusted so that a reduction in the thickness of the strand takes place in the strand guide.
  • the respective rollers of the strand guide are adjustable so that, during the regular casting process, the thickness of the strand emerging from the mold is already reduced in the strand guide, preferably before it has completely solidified.
  • any rolling mill that is connected to the strand guide or to a connecting system in the conveying direction can be designed more compactly.
  • a rolling mill has several, for example five, rolling stands (passes).
  • at least one rolling stand can be saved. This allows the entire plant, consisting of continuous casting plant, connecting system and rolling mill, to be manufactured more compactly and possibly also more cost-effectively.
  • a greater reduction in the thickness of the strand can be achieved with a conventional design of the rolling mill.
  • the strand guide has one or more interchangeable segments, each with several rollers arranged in pairs.
  • a conventional continuous casting plant can be easily retrofitted with a strand guide of the type described without any thickness reduction.
  • the retrofitting can be carried out in a modular manner.
  • lower exit thicknesses from the strand guide and thus thinner final dimensions at the exit of a rolling mill can be achieved.
  • thinner final dimensions are only to be produced occasionally, it is possible to work with several non-adjustable segments and only install an adjustable segment (analogous to several adjustable segments) when producing particularly thin dimensions.
  • the adjustable segment (or several adjustable segments) can always be installed, whereby the adjustable rollers are only moved into a reduction position during the production of particularly thin dimensions and are otherwise in a zero position without thickness reduction.
  • the rollers of the strand guide comprise first roller pairs directly adjacent to the mold and reduction roller pairs directly adjacent to the first roller pairs in the conveying direction.
  • the rollers of the first roller pairs are not adjustable, whereby no thickness reduction of the strand takes place in this area of the strand guide, i.e., an area directly adjacent to the mold.
  • the thickness reduction thus only begins “later,” after the strand has passed through the first roller pairs. This prevents fluctuations in the casting level and prevents the strand from detaching from the mold wall, further improving operational reliability. A good compromise between operational reliability, compactness, and thickness reduction is achieved when the strand guide has two or three first roller pairs and eight to fifteen reduction roller pairs.
  • the rollers of the strand guide further comprise final roller pairs which adjoin the reduction roller pairs in the conveying direction, are preferably adjustable, but do not lead to any further reduction in the thickness of the strand.
  • no further reduction in the strand thickness takes place in the last section of the strand guide, for example before the strand is gripped by the rollers of a straightening driver.
  • the system is controlled such that the sump tip of the strand lies in the region of the last roller pairs during regular casting.
  • the sump tip is the position of the strand in the conveying direction at which the still liquid core transitions into the completely solidified region. Since the strand first solidifies on the surface and the temperature increases from the outside to the inside, the liquid core has approximately the shape of a cone in the conveying direction, with the tip of the cone being referred to as the sump tip.
  • the strand is preferably completely solidified when it reaches the straightening driver.
  • the strand guide preferably has a bending area in which the strand is bent. If the continuous casting plant is designed as a vertical bending plant, the strand exits the mold vertically downwards, is guided downwards by the strand guide, and then deflected along an arc. In this case, the strand does not have to be bent completely to the horizontal within the strand guide. The remaining bending to the horizontal takes place in the straightening driver. The strand can then be transported horizontally to pass through further stations, such as a straightening driver, a cutting device for cutting the strand into slabs of a specific length, a furnace, and a rolling mill.
  • the adjustable rollers are preferably hydraulically, magnetically, or electromotively actuated.
  • the strand guide has one or more hydraulic cylinders, in each of which a piston is hydraulically displaceable for adjusting an adjustable roller attached to it.
  • the piston By hydraulic control, for example by means of oil, the piston can be moved back and forth between the zero position and the reduction position.
  • Both rollers of a pair of rollers, or just one roller of the pair can be adjustable.
  • the strand thickness can be reduced to different exit thicknesses.
  • a frame part of the above-mentioned segment (analogously, several segments) of the strand guide can be adjustable, whereby several rollers can be adjusted in groups to reduce the strand thickness.
  • the roller pitch profile can be suitably adjusted depending on the degree of reduction, reduction distance, strand material, etc.
  • the decreasing positions of the rollers can be distributed linearly or parabolically, so that the thickness reduction occurs linearly or parabolically along the strand guide.
  • the thickness reduction of the strand takes place when the core is not completely solidified, which enables energy-saving operation of the plant and also contributes to an improvement in the casting quality.
  • the Figure 2 shows schematically a continuous casting plant, the basic structure of which is the Figure 1
  • the strand guide 2 is connected to the mold 1.
  • the straightening driver 3 is provided for pulling the strand S out of the strand guide 2.
  • the strand guide 2 of the embodiment of the Figure 2 only a single segment 23, although according to other embodiments, several segments can be provided.
  • a continuous casting plant with only one segment 23 has greater rigidity and can absorb the bending forces generated by the straightening driver 3 better than a continuous casting plant of the same length with several segments.
  • all segments may have to be replaced one after the other after a malfunction, such as a breakout.
  • Segment 23 has a plurality of rollers 24a, 24b, 24c (collectively referred to as rollers 24) arranged in pairs, whereby they form a gap (two rollers 24 always facing each other) through which the strand S emerging downwards from the mold 1 passes and is guided along a curved path.
  • the not yet fully solidified strand is therefore first guided vertically downwards, then deflected along a curve by the strand guide 2 and then transported horizontally.
  • the strand S cools, which can be actively supported and/or controlled by applying a cooling fluid if necessary.
  • the straightening driver 3 is arranged as part of a connecting system in the conveying direction F behind the segment 23 in order to pull the strand S out of the strand guide 2 and bend it completely into the horizontal position.
  • the straightening driver 3 has several rollers 31 arranged in pairs, which are driven rollers, for example, driven by one or more electric motors (not shown).
  • one or more rollers 24 of the strand guide 23 are adjustable, which can include, in particular, adjustability during the casting process.
  • the adjustability or adjustability is provided such that one or more pairs of rollers can be moved together, whereby the transport gap can be varied, in particular reduced, along the conveying direction F.
  • roller pairs 24a one or more roller pairs directly below the mold 1 are referred to as the first roller pairs 24a. Roller pairs that follow them in the conveying direction F are referred to as the middle roller pairs or reduction roller pairs 24b.
  • the first rollers 24a are not adjustable, with this first roller group preferably comprising two or three roller pairs 24a.
  • this first roller group preferably comprising two or three roller pairs 24a.
  • the last roller pairs 24c preferably approximately four roller pairs, are also preferably adjustable. However, this adjustment only serves to follow the previously adjusted strand thickness. In this case, no further thickness reduction of the strand S takes place in the section of the last roller pairs 24c.

Landscapes

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

Claims (12)

  1. Installation de coulée continue, qui comprend un lingotier (1) pour la production d'un produit coulé (S) et un guidage de produit coulé (2) se raccordant au lingotier (1) et comportant plusieurs rouleaux (24) disposés par paires pour transporter le produit coulé (S) dans une direction de transport (F), dans laquelle
    un ou plusieurs des rouleaux (24) sont réglables de telle sorte qu'une réduction d'épaisseur du produit coulé (S) ait lieu dans le guidage de produit coulé,
    caractérisée en ce que
    le guidage de produit coulé (2) comprend un ou plusieurs segments interchangeables (23) comportant chacun plusieurs rouleaux réglables (24) disposés par paires.
  2. Installation de coulée continue selon la revendication 1, caractérisée en ce que les rouleaux (24) comprennent des premières paires de rouleaux (24a), qui se raccordent directement au lingotier (1), et des paires de rouleaux de réduction (24b), qui se raccordent directement aux premières paires de rouleaux (24a) dans la direction de transport (F), les rouleaux des premières paires de rouleaux (24a) n'étant pas réglables, de sorte que dans cette zone du guidage de produit coulé (2) aucune réduction d'épaisseur du produit coulé (S) n'ait lieu, tandis qu'un ou plusieurs, de préférence tous, des rouleaux des paires de rouleaux de réduction (24b) sont réglables, de sorte que dans cette zone du guidage de produit coulé (2) une réduction d'épaisseur du produit coulé (S) ait lieu.
  3. Installation de coulée continue selon la revendication 2, caractérisée en ce que le guidage de produit coulé (2) comprend deux ou trois premières paires de rouleaux (24a) et de préférence huit à quinze paires de rouleaux de réduction (24b).
  4. Installation de coulée continue selon la revendication 2 ou 3, caractérisée en ce que les rouleaux (24) comprennent en outre des dernières paires de rouleaux (24c), qui se raccordent aux paires de rouleaux de réduction (24b) dans la direction de transport (F), sont de préférence réglables, mais n'entraînent aucune réduction d'épaisseur supplémentaire du produit coulé (S).
  5. Installation de coulée continue selon la revendication 4, caractérisée en ce qu'elle est agencée de telle sorte que la pointe du bain liquide du produit coulé (S) se situe, pendant le processus de coulée normal, dans la zone des dernières paires de rouleaux (24c).
  6. Installation de coulée continue selon l'une des revendications précédentes, caractérisée en ce que le guidage de produit coulé (2) comprend une zone de cintrage, dans laquelle le produit coulé (S) est cintré, de préférence l'installation de coulée continue est conçue comme une installation de cintrage vertical, dans laquelle le produit coulé (S) sort verticalement vers le bas du lingotier (1), est guidé vers le bas par le guidage de produit coulé (2) et ensuite dévié entièrement ou partiellement le long d'un arc en direction de l'horizontale et transporté plus loin.
  7. Installation de coulée continue selon l'une des revendications précédentes, caractérisée en ce qu'un extracteur-redresseur (3) se raccorde au guidage de produit coulé (2) dans la direction de transport (F), lequel comprend plusieurs rouleaux entraînés (31) et est agencé pour extraire le produit coulé (S) hors du guidage de produit coulé (2) et le redresser complètement à l'horizontale.
  8. Installation de coulée continue selon l'une des revendications précédentes, caractérisée en ce que les rouleaux réglables (24) sont actionnables hydrauliquement, magnétiquement ou par moteur électrique, de préférence le guidage de produit coulé (2) comprend un ou plusieurs vérins hydrauliques (26), dans lesquels des pistons (25) sont déplaçables hydrauliquement pour le réglage des rouleaux réglables (24).
  9. Installation de coulée continue selon l'une des revendications précédentes, caractérisée en ce que les rouleaux réglables (24) peuvent prendre chacun exactement deux positions, une position neutre, dans laquelle aucune réduction d'épaisseur du produit coulé (S) n'a lieu à la position concernée dans le guidage de produit coulé (2), et une position de réduction, dans laquelle une réduction d'épaisseur du produit coulé (S) a lieu à la position concernée dans le guidage de produit coulé (2).
  10. Procédé de coulée d'un produit coulé (S) au moyen d'une installation selon l'une des revendications précédentes, dans lequel un ou plusieurs des rouleaux (24) du guidage de produit coulé (2) sont réglés de telle sorte que l'épaisseur du produit coulé (S) soit réduite pendant le processus de coulée dans le guidage de produit coulé (2).
  11. Procédé selon la revendication 10, caractérisé en ce que la réduction d'épaisseur du produit coulé (S) dans le guidage de produit coulé (2) a lieu lorsque le noyau du produit coulé (S) n'est pas complètement solidifié.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que les rouleaux réglables (24) sont réglés en tenant compte de paramètres de processus et sur la base d'un modèle de calcul de température, avec lequel des caractéristiques de température du produit coulé (S), de préférence la position de la pointe du bain liquide et/ou l'épaisseur de la peau du produit coulé, peuvent être déterminées.
EP18782420.6A 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels Active EP3703883B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017219464.2A DE102017219464A1 (de) 2017-10-30 2017-10-30 Stranggießanlage mit Einzelrollenanstellung
PCT/EP2018/076879 WO2019086192A1 (fr) 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels

Publications (2)

Publication Number Publication Date
EP3703883A1 EP3703883A1 (fr) 2020-09-09
EP3703883B1 true EP3703883B1 (fr) 2025-07-09

Family

ID=63762532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18782420.6A Active EP3703883B1 (fr) 2017-10-30 2018-10-02 Installation de coulée continue à réglage de cylindres individuels

Country Status (4)

Country Link
US (1) US20200254513A1 (fr)
EP (1) EP3703883B1 (fr)
DE (1) DE102017219464A1 (fr)
WO (1) WO2019086192A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234546A1 (de) * 1981-10-05 1983-04-21 Voest-Alpine AG, 4010 Linz Stuetz- und fuehrungsgeruest fuer eine stranggiessanlage
US5488987A (en) * 1991-10-31 1996-02-06 Danieli & C. Officine Meccaniche Spa Method for the controlled pre-rolling of thin slabs leaving a continuous casting plant, and relative device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907905C2 (de) * 1988-07-04 1999-01-21 Mannesmann Ag Stranggießverfahren
JP3008821B2 (ja) * 1994-07-29 2000-02-14 住友金属工業株式会社 薄鋳片の連続鋳造方法および装置
DE19639302C2 (de) * 1996-09-25 2000-02-24 Schloemann Siemag Ag Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggießanlage
DE10122118A1 (de) * 2001-05-07 2002-11-14 Sms Demag Ag Verfahren und Vorrichtung zum Stranggiessen von Blöcken, Brammen und Dünnbrammen
EP2441538A1 (fr) * 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Dispositif de coulée continue doté d'une réduction de barre dynamique
DE102015210865A1 (de) 2015-05-06 2016-11-10 Sms Group Gmbh Gieß-Walz-Anlage und Verfahren zu deren Betrieb
DE102015215187A1 (de) 2015-08-10 2017-02-16 Sms Group Gmbh Schmelzmetallurgische Anlage, umfassend eine Kokille

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234546A1 (de) * 1981-10-05 1983-04-21 Voest-Alpine AG, 4010 Linz Stuetz- und fuehrungsgeruest fuer eine stranggiessanlage
US5488987A (en) * 1991-10-31 1996-02-06 Danieli & C. Officine Meccaniche Spa Method for the controlled pre-rolling of thin slabs leaving a continuous casting plant, and relative device

Also Published As

Publication number Publication date
WO2019086192A1 (fr) 2019-05-09
DE102017219464A1 (de) 2019-05-02
US20200254513A1 (en) 2020-08-13
EP3703883A1 (fr) 2020-09-09

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