EP2788133A1 - Mesures d'amélioration du processus dans une machine de coulée continue au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction - Google Patents

Mesures d'amélioration du processus dans une machine de coulée continue au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction

Info

Publication number
EP2788133A1
EP2788133A1 EP12798200.7A EP12798200A EP2788133A1 EP 2788133 A1 EP2788133 A1 EP 2788133A1 EP 12798200 A EP12798200 A EP 12798200A EP 2788133 A1 EP2788133 A1 EP 2788133A1
Authority
EP
European Patent Office
Prior art keywords
strand
cooling
pair
mold
casting
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.)
Granted
Application number
EP12798200.7A
Other languages
German (de)
English (en)
Other versions
EP2788133B1 (fr
Inventor
Kurt Dittenberger
Udo Feischl
Klemens Hauser
Wolfgang Kibler
Paul Pennerstorfer
Franz Ramstorfer
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
Original Assignee
Siemens VAI Metals Technologies GmbH Austria
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
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Application filed by Siemens VAI Metals Technologies GmbH Austria filed Critical Siemens VAI Metals Technologies GmbH Austria
Publication of EP2788133A1 publication Critical patent/EP2788133A1/fr
Application granted granted Critical
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Active legal-status Critical Current
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Links

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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars
    • 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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars
    • B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots
    • 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
    • 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
    • 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
    • B22D11/14—Plants for 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
    • 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
    • B22D11/208—Controlling or regulating processes or operations for removing cast stock for aligning the guide rolls
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary 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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the present invention relates to a method for each
  • the invention relates to a method for operating a continuous casting machine at casting start, wherein the
  • Continuous casting machine comprises a mold and a strand guide, and the strand guide comprises at least a pair of engagable strand guide rollers and at least one cooling nozzle, comprising the following method steps:
  • the invention relates to a method for operating a continuous casting machine at the end of casting, wherein the
  • Continuous casting machine comprises a mold and a strand guide, and the strand guide comprises at least a pair of engagable strand guide rollers and at least one cooling nozzle, comprising the following method steps: Continuously casting a strand, wherein in the mold liquid steel is poured into an at least partially solidified strand;
  • Strand region having a length B, 0.5 ⁇ B ⁇ 5 m, and subsequently having a strand main part;
  • Casting is pulled out of the mold.
  • the invention relates to a method for operating a continuous casting machine in a temporary
  • the continuous casting machine comprises a mold and a strand guide
  • the strand guide comprises at least a pair of engagable strand guide rolls and at least one cooling nozzle, comprising the following
  • the object of the invention is to overcome the disadvantages of the prior art and to present an operating method for a continuous casting machine at casting start, at the end of casting, and at a slowing down of the casting operation, with which the quality of the strand ends (of the strand beginning and strand ends) is improved, and
  • the continuous casting machine is preventively protected against damage when applying the method.
  • Claim 1 relates to a method for operating a
  • Has passed strand guide rollers setting the pair to the strand so that the pair touches the strand;
  • Nominal amount of refrigerant Q Nominal comprises applying to the strand starting region; Cooling the strand main body with Q ⁇ Q nn, wherein the cooling nozzle has a coolant amount Q substantially equal to Q Nen. on the strand body.
  • the term continuous casting machine all fall
  • Casting machines which are suitable for the continuous production of a strand with a long or flat product cross-section from a molten steel.
  • the invention is based on the finding that the
  • Strand ends i. the strand beginning and the strand end are colder than the intervening strand (hereinafter also referred to as the strand main part), which is continuously cast at nominal casting conditions. This is mainly due to the reduced casting speed at the casting start and casting end.
  • heat is transferred via the cold strand or through the water, which in addition to the strand end or the strand board, i. the end face of the Strangendes, arrives, dissipated. Because of the lower temperature, the strand ends i.A. completely solidified. When these two cold and solidified strand ends are transported through the machine, it may be particularly in the bending and straightening zone (i.e., in the zones where the strand of the
  • Rolling forces come, which are caused by the contact of individual (or at least less) roles with these strand parts (instead of a contact of several roles in one
  • roller forces can be far above the maximum permissible values of the roller bearings and thus lead to damage of the rollers or the roller position.
  • the position of the cold rod head or the strand beginning - which is opposite to the cold strand head - when pulling the dummy strand (or the strand, since the strand connected to the cold strand) in the strand guide is time continuously or temporally discretized (eg at defined sampling times) detected (Engl, "tracked") after the Strangagging, or preferably the upper end of
  • Strand section with a length of length A, 0.5 ⁇ A ⁇ 5 m, has passed through a pair of adjustable strand guide rollers, the pair is hitched to the strand so that the pair touches the strand. Furthermore, the strand start region is cooled by a cooling nozzle less than the
  • Strand main body adjoining the strand catchment area; specifically the strand initial area with a coolant amount Q ⁇ Q Ne nn and the strand body having a refrigerant quantity Q Q ⁇ hen cooled.
  • the strand beginning in the language of the expert is "softer cooled" than the
  • Strand body continuously cast at nominal casting conditions. Preferably, only after the
  • Strang a distance of typically several meters in the casting direction of a pair of opposite
  • a strand guiding roller of a strand guide segment which is made by the inclination of the clamping cylinder of the segment, or a strand guide roller, which is made by a (see, for example, WO01 / 94051) or two Anstellzylinder to the strand.
  • the rated refrigerant amount QNenn is from
  • Casting speed the strand age or particularly preferably dependent on the location-dependent strand temperature.
  • Q rated is smaller at a low casting speed than at a higher casting speed.
  • QNon depending on the strand temperature
  • Strand temperature either by measurement (for example by means of a pyrometer) or by online simulation of the strand temperature (for example by the software package Dynacs or Dynacs 3D)
  • Stranbegfangs or Stranbegfangs reasonably evenly to the temperature of the strand main body, which is poured continuously at nominal casting conditions is adjusted.
  • the increase in the amount of coolant can be done either continuously or in discrete steps. Below the distance is the difference of the so-called
  • the strand is reduced by the employment of the pair of engagable strand guide rollers to the strand in its thickness. It is particularly advantageous if the strand in the
  • the object of the invention is also by a
  • Claim 5 relates to a method for operating a
  • Coolant nozzle a quantity of coolant Q substantially equal to a nominal coolant quantity Q Nenn diligentstingt on the strand area;
  • a strand end is formed in the mold, followed by a strand region with a length B and a strand main part in the casting direction.
  • the position of the strand end in the strand guide is in turn detected.
  • the pair of engagable strand guide rollers are replaced by the strand end, Preferably, before a lower end of the strand area, the couple has passed, pulled back from the strand, so that the two strand guide rollers no longer touch the strand (positively formulated means that both
  • Strand guide rollers have a distance from the surface of the strand).
  • the strand body is cooled substantially with the rated coolant amount Q Ne nn; of the
  • discharged coolant quantity Q is reduced as a function of a distance between the strand end and the cooling nozzle, where 0 ⁇ Q ⁇ Q Ne nn ⁇
  • the end plate is subjected to the maximum water flow rate, at least in the first three cooling zones of the strand guide, so that spill-out is reliably prevented it is advantageous to stop cooling through the cooling nozzle after the strand end has passed the cooling nozzle.
  • the object of the invention is also by a
  • Claim 9 relates to a method for operating a
  • Coolant nozzle a quantity of coolant Q substantially equal to a nominal coolant quantity Q Nenn personallystingt on the strand main body;
  • Coolant nozzle a quantity of coolant Q ⁇ Q nominal on the
  • Strand body is. Damage to the strand guide is prevented by having a pair of adjusters
  • the guide rollers are retracted before passing the adapter so that the track guide rollers do not contact the adapter. After passing the
  • Figure 1 is a schematic representation of the method according to the invention at the start of casting, wherein the different phases are shown in the subfigures la to ld;
  • Figure 2 is a schematic representation of the method according to the invention at the end of casting, wherein the phases are shown in the subfigures 2a to 2f;
  • FIG. 3 shows a schematic representation of the cooling quantity distribution in a strand start region
  • Figure 5 is a schematic representation of the method according to the invention in a temporary slowdown of
  • Figure 1 shows the inventive method for operating a continuous casting machine at casting start, wherein the
  • the continuous casting machine 1 is in this case as a vertical continuous casting machine with a cooled Continuous mold 3 carried out for the continuous casting of liquid steel to a strand 2 with billet or
  • Vorblockprofilquerites is formed.
  • the strand guide 4 has a plurality of pairs of mutually engageable with the strand 2 strand guide rollers 5 and a plurality of cooling nozzles 10.
  • liquid steel is filled by means of a dip tube, not shown, in the mold 3, where the molten steel by a so-called
  • Primary cooling is cooled and thereby forms a partially solid strand 2 with a thin strand shell.
  • Fig la shows the situation before the casting start, which is referred to in this application as casting start.
  • a casting distributor (not shown) fills molten steel via a dip tube (narrow SEN) into the mold 3, wherein a casting mirror (the
  • Strand beginning area 17 with a length A, and a
  • Strand main part 20 has. At the contact surface between the cold strand head 7 and the strand 2 forms the
  • Strangsweeping 16 which is welded to the cold rod head 7. Contrary to the casting 9 follows on the strand beginning 16 of the strand starting region 17, and on the
  • FIG. 1 c shows the situation when the cold strand 6 is pulled out of the mold 3.
  • the casting mirror 15 in the mold is held approximately constant by the supply of molten steel, so that the cold strand 6 - which is connected to the strand 2 - is pulled out in the casting direction 9 - by the
  • drivable strand guide rollers 8 is also pulled out of the mold.
  • a rotary encoder which is connected to a hired, driven strand guide roller 8.
  • the person skilled in the art also knows of other ways in which the position of the cold rod head can be detected or "tracked.”
  • Strand guide rollers 5 of the case, their employment has been indicated to the strand 2 by an arrow.
  • Cooling nozzle pair 10 a reduced amount of coolant Q ⁇ Q Ne nn of
  • the reduced amount of refrigerant is represented in the figures by a thin jet of coolant.
  • Strangergfangs Symposium 17 is defined by the strand beginning 16 and by the length A.
  • FIG. 1 d shows a further situation during casting start, wherein the strand 2 has been pulled further out of the mold 3.
  • the strand beginning 16 has passed the two uppermost pairs of strand guide rollers 5, so that both pairs are employed on the strand 2.
  • the strand beginning area 17 with a length of A 3 m, the one with a reduced
  • Coolant quantity is cooled is also shown.
  • the uppermost cooling nozzle 10 is already outside the
  • the engageable strand guide rollers 5 are not placed on the strand immediately after passing the strand start 16, but only after the upper end 17a has passed the rollers 5 or the strand beginning 16 has reached a position that the
  • the quantity of coolant Q discharged from the cooling nozzle 10 onto the strand starting region 17 is increased as a function of a distance 11 between the strand start 16 and the cooling nozzle 10, where 0 ⁇ Q ⁇ Q nominal .
  • the strand beginning 16 or the strand start region becomes 17 cooled less than the subsequent strand main piece 20, wherein the amount of coolant Q is continuously or discretely increased to Qtienn.
  • Coolant quantity Q over the distance x (in Fig ld the
  • Reference numeral 11, wherein x runs counter to the casting direction 9) is increased between the strand start 16 and the cooling nozzle.
  • the solid line indicates one
  • Q ⁇ nominal ⁇
  • Fig. 2a shows the continuous operation of
  • Continuous casting machine 1 wherein all strand guide rollers 5, 8 of the strand guide are employed on the strand 2 and the strand 2 is cooled by the cooling nozzles 10 with the nominal coolant quantity QNenn (represented by a wide coolant jet).
  • Fig. 2c shows a position of the strand 2 where, just before the lower end of the strand portion 19a has passed the uppermost pair of engagable strand guide rolls 5, the pair is retracted from the strand 2 so that the pair does not touch the strand region, i. that the rollers of the pair have a distance transversely to the casting direction 9 to the strand.
  • the retraction is by an arrow
  • FIG. 2 d shows a further position of the strand 2, wherein the strand region 19 is cooled by the uppermost cooling nozzles 10 with a reduced amount of coolant Q ⁇ Q Ne nn.
  • Fig. 2e shows another position of the strand 2 at
  • Strand guide rollers 5 were withdrawn from the strand.
  • the second row of the cooling nozzles 10 cools the strand region 19 again with a reduced amount of coolant.
  • FIG. 2f shows the case in which the strand end 18 has already passed the uppermost row of cooling nozzles 10, so that the cooling by these cooling nozzles 10 is ended.
  • FIG. 5 shows the method for operating the continuous casting plant according to FIG. 1 during a temporary deceleration of the casting operation.
  • 5a shows the continuous operation of
  • Transition piece 21 initiated, wherein in Figure 5b, the lower end 21a of the transition piece is formed.
  • Transition piece in the casting direction 9 subsequent strand part is referred to as the lower strand main piece 20a.
  • Transition piece 21 is formed, whereby the formation of the intermediate piece 21 is terminated.
  • the positions of the upper 21b and lower end 21a of the transition piece 21 are detected, for example by means of the driven strand guide rollers 8, so that their positions for the subsequent position of engageable
  • Strand guide rollers 5 and the cooling nozzles 10 can be used.
  • Fig. 5e shows how the strand 2 with the lower
  • FIG. 5f shows a further situation in the production of the transition piece 21.
  • the strand 2 is pulled out further, with the uppermost pair of strand guiding rolls being brought back to the strand 2 or the upper strand main part 20b.
  • the second pair of strand guide rolls has already undergone this sequence of strand withdrawal and reinstatement to the strand.
  • a reduced amount of coolant is represented by a thinner coolant jet.
  • the third pair of rollers 5 was before the lower end 21 a of
  • Transition piece 21 rolls happens, from strand
  • the retraction may be either immediately prior to passing the lower end 21a, or already done a few meters before actually passing. Similarly, the

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

Abstract

L'invention concerne un procédé permettant de faire fonctionner une machine de coulée continue (1) au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction (21). L'invention vise à améliorer la qualité des extrémités de barre (16, 18) et à assurer une protection préventive de la machine de coulée continue (1) contre des endommagements lors de la mise en œuvre du procédé. A cet effet, l'invention propose un procédé permettant de faire fonctionner une machine de coulée continue (1) au démarrage de la coulée, comprenant les étapes supplémentaires suivantes : - la détection d'une position de l'amorce de barre (16) dans le guidage de barre (4) ; - une fois que l'amorce de barre (16), de préférence une extrémité supérieure (17a) de la partie amorce de barre (17), a passé la paire de rouleaux de guidage de barres réglables (5), le positionnement de la paire de rouleaux au niveau de la barre (2) de telle manière qu'elle touche la barre (2) ; - le refroidissement de la partie amorce de barre (17) par une quantité de réfrigérant Q < QNenn, la buse de refroidissement (10) appliquant sur la partie amorce de barre (17) une quantité de réfrigérant Q inférieure à une quantité de réfrigérant nominale QNenn ; - et le refroidissement de la partie principale de barre (20) par une quantité de réfrigérant Q ≈ QNenn, la buse de refroidissement (10) appliquant sur la partie principale de barre (20) une quantité de réfrigérant Q sensiblement égale à la quantité QNenn.
EP12798200.7A 2011-12-05 2012-11-19 Mesures d'amélioration du processus dans une machine de coulée continue au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction Active EP2788133B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1792/2011A AT512214B1 (de) 2011-12-05 2011-12-05 Prozesstechnische massnahmen in einer stranggiessmaschine bei giessstart, bei giessende und bei der herstellung eines übergangsstücks
PCT/EP2012/072959 WO2013083391A1 (fr) 2011-12-05 2012-11-19 Mesures d'amélioration du processus dans une machine de coulée continue au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction

Publications (2)

Publication Number Publication Date
EP2788133A1 true EP2788133A1 (fr) 2014-10-15
EP2788133B1 EP2788133B1 (fr) 2016-02-03

Family

ID=47324071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12798200.7A Active EP2788133B1 (fr) 2011-12-05 2012-11-19 Mesures d'amélioration du processus dans une machine de coulée continue au démarrage de la coulée, à la fin de la coulée et lors de la production d'un élément de jonction

Country Status (7)

Country Link
US (1) US9254520B2 (fr)
EP (1) EP2788133B1 (fr)
KR (1) KR101984634B1 (fr)
CN (1) CN103958094B (fr)
AT (1) AT512214B1 (fr)
RU (1) RU2620320C2 (fr)
WO (1) WO2013083391A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
RU2675880C2 (ru) * 2014-03-27 2018-12-25 Прайметалз Текнолоджиз Аустриа ГмбХ Полунепрерывное литье стальной заготовки
EP3437756B1 (fr) * 2017-08-04 2021-12-22 Primetals Technologies Austria GmbH Coulée continue d'une barre métallique
EP3437759B1 (fr) * 2017-08-04 2022-10-12 Primetals Technologies Austria GmbH Coulée continue d'une barre métallique
EP3437757A1 (fr) * 2017-08-04 2019-02-06 Primetals Technologies Austria GmbH Coulée continue d'une barre métallique
EP3546086B1 (fr) * 2018-03-28 2021-01-06 Hydro Aluminium Rolled Products GmbH Procédé destiné à la coulée continue d'une structure métallique à l'aide d'une lingotière et d'une brique de coulée
WO2021231124A1 (fr) * 2020-05-13 2021-11-18 Corning Incorporated Appareils de moulage de verre avec buses de refroidissement réglables et leurs procédés d'utilisation
CN117380916B (zh) * 2023-12-08 2024-02-23 成都利华强磁浮连铸科技有限责任公司 一种磁悬浮连铸系统及磁悬浮连铸方法

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US9254520B2 (en) 2016-02-09
US20140290899A1 (en) 2014-10-02
KR20140101414A (ko) 2014-08-19
AT512214A1 (de) 2013-06-15
WO2013083391A1 (fr) 2013-06-13
EP2788133B1 (fr) 2016-02-03
CN103958094A (zh) 2014-07-30
RU2012152085A (ru) 2014-06-10
KR101984634B1 (ko) 2019-05-31
CN103958094B (zh) 2016-02-17
RU2620320C2 (ru) 2017-05-24
AT512214B1 (de) 2015-04-15

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