EP0116030B1 - Procédé de contrôle d'une machine de coulée continue courbe - Google Patents

Procédé de contrôle d'une machine de coulée continue courbe Download PDF

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Publication number
EP0116030B1
EP0116030B1 EP84890003A EP84890003A EP0116030B1 EP 0116030 B1 EP0116030 B1 EP 0116030B1 EP 84890003 A EP84890003 A EP 84890003A EP 84890003 A EP84890003 A EP 84890003A EP 0116030 B1 EP0116030 B1 EP 0116030B1
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EP
European Patent Office
Prior art keywords
strand
stiffness
withdrawal speed
permissible
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84890003A
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German (de)
English (en)
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EP0116030A2 (fr
EP0116030A3 (en
Inventor
Aktiengesellschaft Voest-Alpine
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.)
Voestalpine AG
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Voestalpine AG
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Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0116030A2 publication Critical patent/EP0116030A2/fr
Publication of EP0116030A3 publication Critical patent/EP0116030A3/de
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Publication of EP0116030B1 publication Critical patent/EP0116030B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a method for monitoring a continuous sheet caster, in particular a steel continuous caster, in which a strand emerging from the strand guide is straightened in a straightening unit.
  • Two types of continuous sheet casting plants are known, firstly continuous sheet casting plants in which the strand is cast in an arc mold and straightened after deflecting into the horizontal in a straightening unit, and secondly continuous sheet casting plants in which the strand is cast in a straight mold, in a bending unit is diverted into a circular arc path and straightened in a straightening unit after deflection into the horizontal.
  • Both types can experience line standstills due to malfunctions, i.e. the line remains in the system for a short time until the malfunctions have been remedied.
  • Such strand stoppages or reductions in the strand pull-out speed cause the strand to solidify within the system, so that increased bending or straightening forces are required for bending or straightening the strand as a result of its increased rigidity.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method for monitoring a continuous sheet casting installation by which the pulling of an excessively cooled strand from the installation can be prevented or recognized in good time or by which it is possible, To avoid excessive cooling of the strand within the curved strand guide, so that damage to the system caused thereby can be reliably avoided.
  • This object is achieved in that, depending on the stiffness, i.e. the measure of the resistance to changes in shape of the strand on its way from the mold to the end of the straightening unit is determined by process parameters, such as the strand pull-out speed, the permitted still permitted remaining pull-out time or the still permitted maximum downtime or the still permitted minimum pull-out speed of the rod If the remaining pull-out time or the maximum permitted standstill time is exceeded or if the pull-out speed falls below the minimum pull-out speed, an alarm signal is given and / or the system control is corrected, either by increasing the pull-out speed or by interrupting the casting.
  • process parameters such as the strand pull-out speed, the permitted still permitted remaining pull-out time or the still permitted maximum downtime or the still permitted minimum pull-out speed of the rod If the remaining pull-out time or the maximum permitted standstill time is exceeded or if the pull-out speed falls below the minimum pull-out speed, an alarm signal is given and / or the system control is corrected, either by increasing the pull-out speed or by interrupt
  • a value is preferably assigned to each strand cross-sectional element at a certain distance from the mold level, the size of which corresponds approximately to the rigidity of the element and the determination of which is primarily based on the pull-out speed (s) of the cross-sectional element on its way from the mold level to the specific distance from the mold level the value thus determined for each element is compared with a permissible limit value dependent on the current casting speed, and from the positive differences between the limit values and the determined values, the minimum positive difference is used as a determining factor for the maximum permissible remaining pull-out time.
  • each strand cross-sectional element is assigned a permissible limit value for the stiffness depending on the position it currently occupies, and the determined value of the stiffness of each element is compared with the associated permitted limit value and from all positive differences between the respective limit values and the minimum positive difference is selected from the determined values and used as a determining factor for the still permissible maximum downtime.
  • a value is advantageously given to each strand cross-sectional element at a certain distance from the casting level assigned, the size of which corresponds approximately to the stiffness of the element and for determining which the pull-out speed (s) of the cross-sectional element on its way from the mold level to the specific distance from the mold level is primarily used, a stiffness increase is determined based on the value determined for each element , which on the way of the element from its current distance from the mold level to the end of the straightening unit with a constant pull-out speed results in a stiffness value that is just below all the maximum permissible limit values, and this increase in stiffness is used as a determining factor for each pull-out speed of each element and from these pull-out speeds, the maximum pull-out speed is determined as the minimum pull-out speed still permissible.
  • the cooling conditions are used to determine the rigidity of each element in addition to the pull-out speed, as a result of which the determined rigidity of the strand elements corresponds particularly precisely to the actual conditions.
  • a particularly precise method is characterized in that, in addition to the pull-out speed, the strand cross-sectional format is used to determine the rigidity of each element, the strand quality also being expediently taken into account.
  • the permissible limit values used to determine the maximum permissible remaining pull-out time or the maximum still permissible standstill time or to determine the permissible minimum pull-out speed as a function of the construction-related strength values of the strand guide and, if appropriate, additionally of the strand cross-sectional format and / or the strand quality, thereby determining under Another consideration is the fact that individual machine parts of the continuous caster are more robust than the other machine parts loaded by the strand.
  • the straightening unit is designed for significantly higher loads than the bending unit and the circular arc-shaped strand guide arranged between these units.
  • Fig. 1 shows a schematic representation of a continuous sheet caster
  • 2 and 3 show diagrams in which the rigidity of the strand as a function of the distance from the mold level is illustrated.
  • a pan denotes a pan arranged above an intermediate vessel 2, from which molten steel flows into the intermediate vessel 2.
  • the molten steel flows from the intermediate vessel 2 into a water-cooled straight mold 3.
  • a bending unit 4 is provided, which is followed by an arcuate strand guide 5.
  • a straightening unit 6 is provided, which is followed by a run-out roller table (not shown) with a flame cutting device.
  • a process computer is designated 10.
  • the straight lines 11, 12 illustrate upper limit values for the rigidity of the strand 9, etc. depending on the distance from the mold level 13 to the end 14 of the straightening unit 6.
  • these maximum permissible limit values 11, 12 it is not just machine-dependent factors, i. factors due to the construction of the strand guide (rigidity of the rollers 7, 8, load capacity of their bearings etc.), but also the strand cross-sectional format set on the continuous casting machine and the steel quality to be cast are taken into account.
  • the stiffness 15 of the strand 9 is also entered as a function of the distance from the casting level, as occurs at a certain time during casting.
  • This function thus corresponds to the current stiffness curve at a specific moment and thus represents a kind of "snapshot" of the stiffness of the strand.
  • This "snapshot” can be obtained by dividing the strand 9 into strand cross-sectional elements, which in FIG. 2 are a to n are designated.
  • Each of these elements a to n is assigned a rigidity that takes into account the "history" of the strand, ie each element is assigned due to the "events” that occur on the way from the mold level 13 to the respective position of the element (maximum to End 14 of the straightening unit 6) have experienced a rigidity assigned.
  • This assignment includes any downtimes of the strand, the pull-out speeds v that occurred, and possibly changing cooling conditions (for example the amount of coolant with which each element was acted upon on its way from the mold level 13 to the momentary system of the respective element) or the cross-sectional format of the strand and / or the strand quality is taken into account.
  • the stiffness the temperature of the Melt or the strand surface are taken into account.
  • the element n was first removed from the mold level at a uniform speed V (straight line 16 '), followed by a standstill v o (straight line 16 "), whereupon the element again with a constant pulling speed v 2 (Line 16 "') was moved further, with the speed v 2 being greater than the speed V1 , as can be seen from the lower inclination of the straight line 16'".
  • the element n (and thus also all other elements of the line) was included greatly reduced pull-out speed v 3 , as can be seen from the more inclined straight line 16 "" of the course 16 of the "history" of the nth element.
  • the "history" of the kth element is furthermore with dash-dotted lines 17 that corresponds to the last part of the "history" of the nth element.
  • Fig. 2 Also shown in Fig. 2 is the increase in stiffness 18 of the nth element when the strand is pulled out by the distance between the individual elements, i.e. the nth element, which was initially at the position of the element n-1, experienced an increase in stiffness 18 during the further extension on the way from the position of the (n-1) element to the end of the straightening unit 18. Approximately, it can be assumed be that all elements have experienced approximately the same increase in stiffness 18 during this last pull-out step, including elements a and k.
  • V limit V2 according to FIG. 2.
  • This straight line 19 thus illustrates the minimum permissible rigidity.
  • the rigidity increases only slightly due to the increased cooling water supply (the cooling water is specified with the help of a process computer), so that approximately the same rigidity increase is always assumed for drawing speeds greater than vg renz .
  • the stiffness to be expected for the future period (which the element will need to cover the remaining distance to the end of the straightening unit) is calculated and this stiffness to be expected compared with the maximum permissible stiffnesses 11, 12 If one of the elements on its way to the end 14 of the straightening unit 6 is assigned a higher stiffness at any point on the path still to be covered than is assigned to this point on the path due to the limit curves 11, 12, either an alarm signal is issued or it is given in the control of the system intervened to correct it. This can e.g. by either increasing the pull-out speed or stopping the casting.
  • Fig. 1 From Fig. 1 it can be seen that from the process computer 10 control lines 20, 21, 22 to a ladle slide 23 for setting or closing the same, to a distributor plug 24 for setting or closing the same and to a line control unit 25 for setting a specific line pull-out speed . Another line 26 leads to an alarm system 27.
  • the maximum permissible limit values 11, 12 of the stiffness, the measured value of the current casting speed or pull-out speed, as well as information about the steel quality and the strand cross-sectional format and, if appropriate, about the cooling via input lines 28 are fed into the process computer 10.
  • the calculation of the rigidity of the individual strand elements can be adapted to the current conditions of the casting process on the basis of the current measurement data acquisition.
  • Fig. 3 is shown in a manner analogous to Fig. 2 in a graphical representation that for the elements a to 1 and the element p with the current pull-out speed v the sufficiency is no longer found by the increase in stiffness as it continues with the pouring current casting speed is to be expected (and which is illustrated by the dashed straight lines 29, 30), is drawn from these elements in the diagram. It can be seen that the straight lines 29, 30, which start from the elements a to 1 and from the element p, result in intersections with the maximum permissible limit values 11, 12 for the stiffnesses.
  • the differences between the current stiffness values of the elements a to n and the current locally associated limit values 11, 12 are formed and from these differences (in FIG. 3, one of these differences for the element q is denoted by 33).
  • the minimum difference 34 is given for the element p +, i.e. the element p + is responsible for the maximum permitted downtime.
  • FIG. 3 shows the increase in stiffness ( dash-dotted line 35) for element q during casting with a minimum permissible pull-out speed v rnin.
  • This element q represents the critical element in the instantaneous recording of the stiffness values of the elements shown in FIG. 3, ie The minimum pull-out speed v n ⁇ n must be based on this element; all other elements would allow a lower pull-out speed and thus a higher specific increase in stiffness
  • curves 29, 30 and 35 are used instead of straight lines.
  • Another advantage of the method according to the invention can be seen in the fact that, on the basis of the stiffness values achieved by the individual elements a to n in the individual zones of the strand guide or the maximum stiffness values that occur, statistics about the load on the continuous casting installation or the elements of the strand guide are created can be determined based on the overhaul times of the system.

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

Claims (8)

1. Procédé pour surveiller une installation de coulée continue curviligne, en particulier pour la coulée d'acier, dans laquelle la barre (9), sortant à l'état courbe du guide-barre (5), est redressée dans une machine à dresser (6), caractérisé en ce que, en fonction des paramètres du processus qui influent sur la raideur (15) de la barre (9) c'est-à-dire son degré de résistance aux changements de forme, sur son trajet de la lingotière (3) jusqu'à la fin (14) de la machine à dresser (6), tels que la vitesse d'extraction (v) de la barre, on détermine le temps résiduel d'extraction encore permis, le temps maximal d'arrêt encore permis ou la vitesse minimale d'extraction (Vmin) encore permise de la barre (9) et, en cas de dépassement du temps résiduel d'extraction encore permis ou du temps maximal d'arrêt encore permis, ou en cas de descente au-dessous de la vitesse minimale d'extraction, avec la vitesse actuelle d'extraction, on délivre un signal d'alarme et/ou on intervient par une correction dans la commande de l'installation, soit en augmentant la vitesse d'extraction (v), soit en interrompant la coulée.
2. Procédé selon la revendication 1, caractérisé en ce que, à chaque élément de section droite (a, b, ..., n) de la barre, situé à une distance donnée de la surface du bain de coulée, on attribue une valeur dont la grandeur correspond à peu près à la raideur (15) de l'élément et pour la détermination de laquelle on fait appel, en premier lieu, à la vitesse d'extraction ou aux vitesses d'extraction (v) de l'élément de section (a, b, ..., n) sur son trajet depuis la surface du bain de coulée (13) jusqu'à ladite distance donnée de cette surface, on compare la valeur ainsi déterminée pour chaque élément avec une valeur limite admissible (31,32 sur 11, 12) qui dépend de la vitesse actuelle de coulée et, parmi les différences positives entre les valeurs limites et les valeurs déterminées, on utilise la différence positive minimale comme facteur de définition du temps résiduel d'extraction tout au plus permis encore (figure 3).
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, à chaque élément de section droite (a, b, ..., n) de la barre, situé à une distance donnée de la surface du bain de coulée, on attribue une valeur dont la grandeur correspond à peu près à la raideur (15) de l'élément et pour la détermination de laquelle on fait appel, en premier lieu, à la vitesse d'extraction ou aux vitesses d'extraction (v) de l'élément de section (a, b, ..., n) sur son trajet depuis la surface du bain de coulée (13) jusqu'à ladite distance donnée de cette surface, on attribue à chaque élément une valeur limite admissible pour la raideur, en fonction de la position instantanée occupée par lui, on compare la valeur déterminée de la raideur de chaque élément avec la valeur limite admissible (11, 12) qui y correspond et, parmi toutes les différences positives (33, 34) entre les valeurs limites (11, 12) concernées et les valeurs déterminées, on choisit la différence positive minimale pour l'utiliser comme facteur de définition du temps d'arrêt maximal encore permis (figure 3).
4. Procédé selon les revendications 1 à 3, caractérisé en ce que, à chaque élément de section droite (a, b, ..., n) de la barre, situé à une distance donnée de la surface du bain de coulée, on attribue une valeur dont la grandeur correspond à peu près à la raideur (15) de l'élément et pour la détermination de laquelle on fait appel, en premier lieu, à la vitesse d'extraction ou aux vitesses d'extraction (v) de l'élément de section (a, b,...,n) sur son trajet depuis la surface du bain de coulée (13) jusqu'à ladite distance donnée de cette surface, on fixe, à partir de la valeur ainsi déterminée pour chaque élément, un accroissement de raideur qui, sur le trajet de l'élément à partir de la distance instantanée qu'il occupe de la surface du bain de coulée jusqu'à la fin (14) de la machine à dresser (16), donne, à vitesse constante d'extraction, une valeur de raideur se trouvant tout juste encore au-dessous de toutes les valeurs limites (11, 12) maximales admissibles, on utilise cet accroissement de raideur comme facteur de définition d'une vitesse d'extraction de chaque élément et, parmi les vitesses d'extraction ainsi obtenues, on utilise la vitesse maximale comme vitesse minimale d'extraction (vmin ) encore permise (figure 3).
5. Procédé selon les revendications 2 à 4, caractérisé en ce que, à côté de la vitesse d'extraction, on fait intervenir les conditions de refroidissement pour déterminer la raideur (15) de chaque élément.
6. Procédé selon les revendications 2 à 5, caractérisé en ce que, à côté de la vitesse d'extraction, on fait intervenir le format de la barre, en section droite, pour déterminer la raideur de chaque élément.
7. Procédé selon les revendications 2 à 6, caractérisé en ce que, à côté de la vitesse d'extraction, on fait intervenir la qualité de la barre pour déterminer la raideur de chaque élément.
8. Procédé selon les revendications 2 à 7, caractérisé en ce que l'on fixe les valeurs limites admissibles (11, 12), utilisées pour déterminer le temps résiduel d'extraction tout au plus permis encore, le temps d'arrêt maximal encore permis ou la vitesse minimale d'extraction (Vmin) encore permise, en fonction des caractéristiques de résistance du guide-barre, dépendantes de la construction, ainsi que, en plus, éventuellement, en fonction du format de la barre en section droite et/ou de la qualité de la barre.
EP84890003A 1983-01-11 1984-01-05 Procédé de contrôle d'une machine de coulée continue courbe Expired EP0116030B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0007483A AT378707B (de) 1983-01-11 1983-01-11 Verfahren zum ueberwachen einer bogenstranggiessanlage
AT74/83 1983-01-11

Publications (3)

Publication Number Publication Date
EP0116030A2 EP0116030A2 (fr) 1984-08-15
EP0116030A3 EP0116030A3 (en) 1985-09-11
EP0116030B1 true EP0116030B1 (fr) 1988-03-16

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ID=3480843

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Application Number Title Priority Date Filing Date
EP84890003A Expired EP0116030B1 (fr) 1983-01-11 1984-01-05 Procédé de contrôle d'une machine de coulée continue courbe

Country Status (6)

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US (1) US4588020A (fr)
EP (1) EP0116030B1 (fr)
JP (1) JPS59133960A (fr)
AT (1) AT378707B (fr)
CA (1) CA1196766A (fr)
DE (1) DE3469855D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3606289A1 (de) * 1986-02-27 1987-09-03 Schloemann Siemag Ag Verfahren zur beendigung des giessbetriebes einer stahlbandgiessanlage
DE4210495C1 (fr) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De
AT403351B (de) * 1993-05-19 1998-01-26 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines metallstranges
DE19838774A1 (de) * 1998-08-26 2000-03-02 Schloemann Siemag Ag Strangabzugsverfahren und hiermit korrespondierende Bogenstranggießanlage
DE19841116A1 (de) * 1998-09-09 2000-03-16 Km Europa Metal Ag Verfahren zum Betreiben einer Horizontal-Bandgießanlage und Horizontal-Bandgießanlage zur Durchführung des Verfahrens
DE102009031651A1 (de) * 2009-07-03 2011-01-05 Sms Siemag Aktiengesellschaft Verfahren zum Bestimmen der Lage der Sumpfspitze eines gegossenen Metallstrangs und Stranggießanlage

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
AT234294B (de) * 1961-11-04 1964-06-25 Concast Ag Verfahren und Vorrichtung zum Stranggießen
US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
US3358743A (en) * 1964-10-08 1967-12-19 Bunker Ramo Continuous casting system
US3614978A (en) * 1968-07-01 1971-10-26 Westinghouse Electric Corp Computerized continuous casting system control responsive to strand position
BE787812A (fr) * 1971-08-24 1973-02-21 Uss Eng & Consult Procede et mecanisme pour maitriser les forces exercees sur unebarre coulee en continu a mesure qu'elle se solidifie
US3842894A (en) * 1973-01-17 1974-10-22 American Metal Climax Inc Automatic means for remote sweep-scanning of a liquid level and for controlling flow to maintain such level
JPS5422777B2 (fr) * 1973-09-17 1979-08-09
CH630821A5 (de) * 1978-08-11 1982-07-15 Concast Ag Verfahren zur vermeidung von beschaedigungen an strangfuehrungselementen einer stranggiessanlage fuer stahl.
FR2477925A1 (fr) * 1980-03-13 1981-09-18 Fives Cail Babcock Procede de controle du refroidissement du produit coule dans une installation de coulee continue

Also Published As

Publication number Publication date
CA1196766A (fr) 1985-11-19
US4588020A (en) 1986-05-13
DE3469855D1 (en) 1988-04-21
ATA7483A (de) 1985-02-15
EP0116030A2 (fr) 1984-08-15
JPS59133960A (ja) 1984-08-01
AT378707B (de) 1985-09-25
EP0116030A3 (en) 1985-09-11

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