EP2991788B1 - Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière - Google Patents

Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière Download PDF

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Publication number
EP2991788B1
EP2991788B1 EP14726085.5A EP14726085A EP2991788B1 EP 2991788 B1 EP2991788 B1 EP 2991788B1 EP 14726085 A EP14726085 A EP 14726085A EP 2991788 B1 EP2991788 B1 EP 2991788B1
Authority
EP
European Patent Office
Prior art keywords
meniscus
level
irregularity
mold
bulging
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.)
Not-in-force
Application number
EP14726085.5A
Other languages
German (de)
English (en)
Other versions
EP2991788A1 (fr
Inventor
Heinz-Dieter RUMPLER
Robert ZIRKL
Silvio Cecchini
Andreas DISSAUER
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.)
Tbr Casting Technologies GmbH
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Tbr Casting Technologies GmbH
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Publication date
Application filed by Tbr Casting Technologies GmbH filed Critical Tbr Casting Technologies GmbH
Publication of EP2991788A1 publication Critical patent/EP2991788A1/fr
Application granted granted Critical
Publication of EP2991788B1 publication Critical patent/EP2991788B1/fr
Not-in-force 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings

Definitions

  • the invention relates to a method for controlling the liquid metal level in a mold, in particular a continuous casting mold, according to the preamble of claim 1. Furthermore, the invention relates to a device for carrying out the method according to the invention.
  • the level of the mold level in a mold must be kept as constant as possible and variations in the level of the mold level must be avoided to ensure uniform shell growth and the occurrence of strand defects, such as overlaps, inclusions of mold powder, formation of To avoid cracks, etc.
  • a change in the casting speed represents a one-time event, which leads to a one-time exceeding the allowable fluctuation range of the G manaptapt level to the desired position and which is compensated by the G manaptregelung with some minor Nachschwankache.
  • a wear of plug or spout opening leads to a larger flow rate and would at a constant take-off speed causes an increase of the casting level. However, such wear occurs rather slowly in comparison to the intervention times of the control, so that this effect is generally regulated continuously without any visible effect on the level of the casting mirror.
  • a narrowing of the spout opening by "clogging” also does not occur suddenly and is compensated by the mold level control while maintaining the take-off speed by lifting the plug (or opening the slide). With massive "clogging" and corresponding narrowing of the spout opening, the casting performance for the set withdrawal speed of the strand may possibly no longer be maintained.
  • G intelligentschwankungen can be effected by so-called strand outbookings, known as a "bulging" effect.
  • Strand bulging occurs in particular during the casting of so-called slab formats due to the effect of ferrostatic pressure on the strand shell at locations where it is not supported, ie immediately after exiting the mold and between the strand guide rollers or support rollers.
  • strand bulges also called strand pumps
  • the effect of strand bulges, also called strand pumps, on the casting mirror can be illustrated as follows: If, with a uniform take-off speed of the strand from the mold, bulging and widening of the liquid portion of the casting cross-section initially occurs, the casting level would be uniform if metal is fed into the mold decline. If this strand position then returns to the area of a support roll, the solidified strand shell is compressed, which would cause an increase in the casting level. With constant casting speed, constant ferrostatic pressure and constant casting temperature, these two effects compensate each other and there is no influence on the pouring level.
  • Critical is the effect of irregular strand bulges or unsteady bulging.
  • the volume of the liquid metal within the solidified strand shell changes with uneven strand shell growth.
  • the mold level sinks as it rises as the concave part passes through the area of the support rollers.
  • the present invention is based on the objective of automatically deducing the occurrence of strand bulges from the ongoing analysis of the fluctuations in the levels of the casting mirror detected by the casting level measurement without additional devices on the basis of the number and type of exceeding of defined limit values and their effect to avoid the pouring mirror by an adapted, the normal control process superimposed control algorithm.
  • the amplitude of the G manschwankacheschwankungen is constantly monitored and overruns or falls below an allowable detection limit registered.
  • the procedure proposed by the present invention for detection of irregularities caused by irregular strand bulging is as follows:
  • the amplitude for the detection limits for a positive and / or negative overshoot of the level of the pouring mirror the allowable casting level variation is set to + 1mm to a maximum of + 6mm.
  • a detection threshold between ⁇ 3mm and ⁇ 6mm is selected.
  • a fault counter is incremented by a count of one, starting from zero, whenever the positive or negative detection limit is exceeded. Whenever a count is made, a wait window with a run time of 1.0 sec. up to 3.0sec. open. A further disturbance count is only made if the wait time has expired and it occurs within a certain time window, which is indicative of the effect of irregular string bulges.
  • This collection time frame within that a count is allowed is up to 30.0sec after the wait time.
  • the setting values of the counter for detecting "bulging" can be selected with values between 5 and 10, wherein a value of 8 is preferably selected. If a limit value is exceeded within the waiting time, then no disturbance count takes place. This function is used to detect whether a threshold overshoot is caused by a non-periodic disturbance in which the period of the oscillations is shorter than that caused by burst bulges. Only if there is another fault up to 30 seconds after the waiting time has expired will it be counted and the time window for the waiting time and the acquisition time will be reset and start to run again.
  • a deactivation time window is also opened whose period of time is equal to that of the acquisition time frame. If no further fault occurs within this period, all time windows and the fault counter are reset. This means that no strand bulge was detected. However, if a fault occurs within the set period of time, on the one hand the timers are reset and on the other hand the fault is registered until the fault counter reaches the set value between 5 and 10. When the set number is reached, the counter is set to 0 (zero) and the time window is set to its initial position, ie also 0 (zero). Only after registering a new fault, the time windows are reactivated and the counting process begins again.
  • the present invention is therefore a method by which increased G manschwankonneschwankacheschwankungen attributed to irregular strand bulges ("unsteady bulging") are clearly recognized as such without the use of additional measuring equipment and against other G manadorschwankept, as for example by a change in the Casting speed or the like caused to be demarcated and corrected in the sequence.
  • Characteristic features are the acquisition and registration of additional parameters from the existing measuring and control system, such as a fault count, by means of each of a first following disturbance, the one within the limits of at least ⁇ 3mm to at most ⁇ 6mm from the target value of the water level detects a positive or negative overrun, then increases by the number 1 whenever, after a waiting time in the range of 1.0sec. up to 3.0sec.
  • the Fig. 1 schematically shows the structure of a continuous slab caster. From a distribution vessel, not shown, the liquid steel 1 passes through a spout opening 2 with dip tube in the continuous casting mold 3, wherein the metal inflow is controlled by a plug 4 so that the casting level 5 approximately in accordance with the withdrawal speed V caused by the driver rollers not shown here is kept constant. Furthermore, the shows Fig. 1 the run through support rollers 6 strand, which is formed in this area of the solid strand shell 7 and the existing of liquid steel 1 core.
  • the growth of the initial strand shell is not uniform, but may be different depending on the contact with the mold wall, the effect of the secondary cooling, etc.
  • the Fig. 2 shows the occurrence of so-called regular (strand) bulges 8 ("steady bulging"), which are caused by the ferrostatic pressure.
  • bulges 8 occur, which are then pushed back in the region of the support rollers 6.
  • the effects of these regular bulges 8 and the subsequent back-pressure compensate each other and therefore have no influence on the level of the casting mirror 5.
  • Fig. 3 the influence of irregular (strand) bulges 8 ("unsteady bulging") on the level of the casting mirror 5 is shown schematically.
  • Irregular bulges 8 are characterized in that the maxima of the bulges 8 can be of different heights and also their positions can occur at different locations between the support rollers 6, as indicated by the illustrated arrows. This leads to volume changes in the liquid metal sump and to an influence on the level of the casting mirror 5, which can not be compensated by a likewise indicated by arrow, standard settings current level control.
  • the behavior of the pouring mirror 5 over the time when irregular bulges 8 occur using the measuring and control method according to the invention is shown schematically.
  • the standard controller keeps the level of the pouring mirror 5 within a range of ⁇ 1 mm to ⁇ 3 mm.
  • the standard controller can not control the pouring mirror fluctuations, so that they build up and ultimately exceed the upper and / or lower detection limit.
  • the Fig. 5 summarizes the basics of the invention detection of irregular bulges 8 from the behavior of the Cast Mirrors 5.
  • the requirement for registration as an irregular bulge 8 is that the level of the pouring mirror 5 is between 5 times and 10 times, typically 8 times the set detection or detection limits, each within a selected detection time frame of up to 30.0 seconds after a waiting period of 1.0sec- 3.0sec. exceeds.
  • the Fig. 6 shows a block diagram of how the inventive adaptation of the controller software a G stealadorregelung 10 and a control algorithm according to the invention 11 adapted G stealadorien that are caused by irregular bulges 8, are compensated.
  • the signal coming from the G fauxadormess worn 9 is analyzed in the "Bulging" recognition block 12, as in Fig. 4 and Fig. 5 shown. If no disturbance is registered, the controller will continue to operate in standard pouring mode. If disturbances are registered which indicate the occurrence of "bulging", then the control algorithm 11 is changed to an increased intervention, so that these stronger disturbances which occur at relatively long intervals are also compensated by corresponding influence on the position of the plug 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Continuous Casting (AREA)

Claims (8)

  1. Procédé de régulation d'un niveau d'un ménisque (5), ledit niveau étant constant dans une plage admissible, dans une lingotière (3) de laquelle la barre métallique formée est extraite à une vitesse (V) approximativement constante par des rouleaux (6) adjacents à la lingotière (3) à l'aide d'un dispositif d'extraction de barre électriquement ou hydrauliquement actionné, en contrôlant l'alimentation en métal à partir d'un répartiteur à l'aide d'une unité de régulation du bouchon ou de la vanne qui reçoit son signal de commande d'un dispositif (9) de mesure du ménisque,
    caractérisé en ce que
    d'une part, par l'analyse des fluctuations du ménisque (5) enregistrées de manière continue par le dispositif (9) de mesure du ménisque, on déduit la présence de renflements (8) irréguliers de la barre et, d'autre part, leur impact sur le ménisque (5) est régulé automatiquement par un ajustement d'un algorithme de contrôle (11) pour la régulation du bouchon ou de la vanne régulant l'afflux de métal dans la lingotière (3) en considérant une seule occurrence du niveau du ménisque (5) dépassant ou n'atteignant pas de manière alternante et cyclique les limites d'une plage admissible d'au plus ±6 mm pendant une durée sélectionnable allant jusqu'à 30,0 s après l'expiration d'un temps d'attente de 1,0 s à 3,0 s suivant chaque défaut enregistré comme indice de la présence de renflements (8) de la barre et un algorithme supplémentaire pour la régulation d'afflux conventionnelle est activé, que le cycle dans lequel le niveau du ménisque (5) dépasse ou n'atteint pas la plage de manière inadmissible est compensé par un mouvement opposé asymétrique de la position d'un bouchon (4) ou d'une vanne dans le répartiteur en vue d'une alimentation réduite en métal lorsque la plage est dépassée et d'un afflux accru lorsque la plage n'est pas atteinte et ainsi par un ajustement correspondant de l'alimentation de la lingotière (3) en métal de sorte que le ménisque (5) est maintenu dans la plage définie d'au plus ±3,0 mm, et l'asymétrie du mouvement du bouchon (3) ou de la vanne étant contrôlée de telle manière qu'une interférence entre la fréquence de la fluctuation du ménisque (5) et la fréquence de la commande du bouchon (4) ou de la vanne est évitée.
  2. Procédé selon la revendication 1, caractérisé en ce que les fluctuations de la position du bouchon (4) ou de la vanne provoquées par l'algorithme supplémentaire pour maintenir constant le ménisque (5) sont considérées et enregistrées comme indice de la présence et de l'importance de renflements (8) de la barre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'une seule occurrence du ménisque (5) dépassant ou n'atteignant pas la plage admissible n'est pas considérée comme indice d'un renflement (8) de la barre et ainsi aucun algorithme supplémentaire pour la régulation d'afflux conventionnelle n'est activé.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que multiples occurrences du ménisque (5) dépassant ou n'atteignant pas la plage admissible de manière non cyclique ne sont pas considérées comme indice de la présence de renflements (8) de la barre et ainsi aucun algorithme supplémentaire pour la régulation d'afflux conventionnelle n'est activé.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la plage admissible du ménisque (5) est ±2 mm.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'une occurrence ou plusieurs occurrences du ménisque (5) dépassant ou n'atteignant pas la plage admissible ne sont considérées comme indice d'un renflement (8) irrégulier de la barre par le compteur de défauts que si un nouveau défaut est enregistré après un temps d'attente de 1,0 s à 3,0 s après un défaut et avant l'expiration d'un temps de détection suivant allant jusqu'à 30,0 s, le temps d'attente et le temps de détection recommençant à courir et le compteur de défauts étant réinitialisé si un nombre de défauts présélectionnable entre cinq et dix est atteint et/ou un délai de désactivation allant jusqu'à 30,0 s suivant le temps d'attente a expiré depuis le dernier défaut, ledit délai de désactivation correspondant au temps de détection.
  7. Procédé selon la revendication 6, caractérisé en ce que, de préférence, un temps d'attente de 1,5 s et un temps de détection de 20,0 s suivant sont sélectionnés et le délai de désactivation correspondant au délai de détection ainsi que le nombre maximale de défauts déclenchant la réinitialisation sont fixés à huit.
  8. Dispositif de régulation d'un ménisque (5) dans une lingotière (3), comprenant un dispositif (9) de mesure du ménisque dont le signal peut être fourni à une unité (10) de régulation du ménisque, l'unité (10) de régulation du ménisque étant configurée pour fonctionner selon le procédé selon l'une quelconque des revendications 1 à 7.
EP14726085.5A 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière Not-in-force EP2991788B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3702013A AT514734A1 (de) 2013-05-03 2013-05-03 Verfahren und Vorrichtung zur Regelung des Flüssigmetallspiegels in einer Stranggießkokille
PCT/EP2014/058802 WO2014177605A1 (fr) 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière

Publications (2)

Publication Number Publication Date
EP2991788A1 EP2991788A1 (fr) 2016-03-09
EP2991788B1 true EP2991788B1 (fr) 2019-04-03

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Application Number Title Priority Date Filing Date
EP14726085.5A Not-in-force EP2991788B1 (fr) 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière

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EP (1) EP2991788B1 (fr)
AT (1) AT514734A1 (fr)
WO (1) WO2014177605A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT519390B1 (de) * 2016-12-13 2020-09-15 Primetals Technologies Austria GmbH Verfahren und Vorrichtung zum Regeln einer Stranggießanlage
DE102018203666A1 (de) * 2018-03-12 2019-09-12 Sms Group Gmbh Verfahren zur Vermeidung von Gießspiegelschwankungen während einer Gießsequenz
CN113263170A (zh) * 2021-05-13 2021-08-17 马鞍山钢铁股份有限公司 一种连铸机定径水口浇注断流补救漏钢方法

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Publication number Priority date Publication date Assignee Title
CA2094029C (fr) * 1991-09-12 1997-04-29 Kazuya Asano Methode de controle du niveau de metal en fusion et dispositif de coulee continue
JP3318742B2 (ja) * 1999-01-14 2002-08-26 住友重機械工業株式会社 連続鋳造設備のモールド湯面制御装置
WO2000066293A1 (fr) * 1999-04-28 2000-11-09 Sumitomo Metal Industries, Ltd. Regulation du niveau de la surface du metal dans un moule en moulage continu
JP2006088212A (ja) * 2004-09-27 2006-04-06 Jfe Steel Kk 連続鋳造における湯面レベル制御方法
AT502525B1 (de) * 2005-10-12 2008-05-15 Voest Alpine Ind Anlagen Verfahren zum stranggiessen einer metallschmelze

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Also Published As

Publication number Publication date
EP2991788A1 (fr) 2016-03-09
WO2014177605A1 (fr) 2014-11-06
AT514734A1 (de) 2015-03-15

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