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EP0542024B1 - Procédé de la coulée de métaux liquides dans une machine de coulée continu - Google Patents

Procédé de la coulée de métaux liquides dans une machine de coulée continu Download PDF

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Publication number
EP0542024B1
EP0542024B1 EP92118311A EP92118311A EP0542024B1 EP 0542024 B1 EP0542024 B1 EP 0542024B1 EP 92118311 A EP92118311 A EP 92118311A EP 92118311 A EP92118311 A EP 92118311A EP 0542024 B1 EP0542024 B1 EP 0542024B1
Authority
EP
European Patent Office
Prior art keywords
strand
expansion
wall
casting
process according
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 - Lifetime
Application number
EP92118311A
Other languages
German (de)
English (en)
Other versions
EP0542024A1 (fr
Inventor
Erich Dr.-Ing. Höffken
Dieter Krüger
Heinz Matten
Günter Pietzko
Jürgen Scharlack
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Stahl AG
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 Thyssen Stahl AG filed Critical Thyssen Stahl AG
Publication of EP0542024A1 publication Critical patent/EP0542024A1/fr
Application granted granted Critical
Publication of EP0542024B1 publication Critical patent/EP0542024B1/fr
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Expired - Lifetime 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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

Definitions

  • liquid steel is poured from a distributor into a water-cooled mold, usually a copper mold.
  • a water-cooled mold usually a copper mold.
  • the mold is moved with a frequency of about 1 to 3 Hertz in the direction of the strand extraction.
  • a lubricating film is normally maintained between the steel and the inside of the mold wall. Due to the cooling of the steel through the mold walls, a steel strand with solidified strand shells and a still liquid core is formed.
  • the steel strand which has been partially solidified in this way is pulled out of the mold by means of suitable pull-out means, it being supported and guided by rollers arranged below the mold.
  • the invention is based on a method for casting metals in a continuous casting installation, the strand being continuously pulled out of the mold and the casting process being controlled as a function of the stresses occurring when the strand is pulled out in the continuous casting installation.
  • the object of the invention is to provide measures in such a method with which breaks in the strand can be avoided in a simple manner.
  • the solution to this problem in the above-mentioned method is that during the continuous strand withdrawal, the expansion of the inner wall of the mold caused by the occurrence of mechanical forces in the strand withdrawal direction is measured, and the measurement values obtained are used to control the casting process in such a way that when exceeded the casting speed is reduced or the casting process is interrupted.
  • the method according to the invention is based on the finding that, in the event of pull-out forces acting on the strand, in the event of caking (adhesive), there is a short-term expansion of the mold wall which is in the elastic range.
  • This short-term expansion which is overlaid by the general thermal expansion of the mold wall, is an excellent signal for the occurrence of a breakthrough in the mold.
  • this signal is generated without a time delay, so that the Measures to reduce the casting speed or even stop the casting process can be taken early enough to prevent the liquid metal from flowing out.
  • the method according to the invention can also be used to distinguish between light and heavy caking.
  • slight caking it is sufficient if the casting speed is reduced in such a way that the remaining time in the mold is sufficient to allow a new, stable and solidified strand shell to be formed at the breakthrough point due to the continuous cooling. Then the casting speed can be increased slowly and continuously.
  • heavy caking on the other hand, the casting process must be interrupted immediately, because with such caking the time remaining in the mold is not sufficient to heal the breakthrough.
  • the strain measurement can in principle be carried out at any point on each mold wall. However, it has turned out that it is favorable not to close to the corners of the mold, because there the stretch of the mold wall is the least due to the great rigidity of the construction. It is therefore advantageous if the points are in the middle of the mold walls. You should get at least one from the corners of the mold
  • One third of the width of the side wall in question preferably should be in the middle of the walls.
  • the strain measurement is carried out directly on the strand-side parts of the mold walls by means of suitable sensors, in particular strain gauges, this means a not inconsiderable effort, in particular because of the supply lines to the sensors and lines arranged in the interior of the water tank.
  • the strain measurement is carried out on the outer wall of the water box remote from the strand when the water box forms a rigid unit with the mold inner wall.
  • strain gauges 2a, 2b On the back of the broad side wall 1 shown in FIG. 1 there are two strain gauges 2a, 2b in the center, of which one strain gauge 2a is arranged in the strand pull-out direction and the other strain gauge 2b is arranged transversely thereto.
  • These strain gauges 2a, 2b form a bridge circuit with two resistors R3, R4, in the diagonal of which an amplifier 3 is arranged, which supplies an output signal.
  • the bridge circuit fed by a voltage source 4 is designed such that the amplifier 3 delivers no or a small output signal if the resistance values of the strain gauges 2a, 2b are the same. This is always the case if there are only thermal expansion due to the lack of caking on the mold wall with effective pull-out forces.
  • the bridge circuit is detuned by the fact that the resistance value for the strain gauge 2a increases.
  • the amplifier 3 delivers a suddenly increasing output signal, as shown in the expansion time diagram of FIG. 3 for the time between 140 and 150 seconds. This suddenly rising output signal is evaluated in an evaluation circuit. Depending on this evaluation, the casting process is either slowed down or interrupted.

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

Claims (7)

  1. Procédé de coulée de métaux dans une installation de coulée continue, où la barre continue est extraite de façon continue de la lingotière, le processus de coulée étant piloté en fonction des tensions créées dans l'installation de coulée continue pendant l'extraction de la barre, caractérisé en ce que, pendant l'extraction continue de la barre, l'allongement de la paroi intérieure de la lingotière, dans le sens de l'extraction de la barre, provoqué par l'apparition de contraintes mécaniques, est mesuré, et en ce que les valeurs de mesure relevées sont exploitées pour la régulation du processus de coulée, de manière telle qu'en cas de dépassement de valeurs seuils prédéterminées, on puisse diminuer la vitesse de coulée ou interrompre le processus de coulée.
  2. Procédé selon la revendication 1, caractérisé en ce que l'allongement de la paroi intérieure de la lingotière de coulée continue, transversalement par rapport à la direction d'extraction de la barre, est mesuré et est mis en relation avec la valeur de mesure de l'allongement dans le sens de l'extraction de la barre, de manière telle que la part de l'allongement, qui est due à la chaleur, soit éliminée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les mesures des allongements dans le sens de l'extraction de la barre, et transversalement à celui-ci, sont effectuées dans des points aussi rapprochés que possible l'un de l'autre.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que les mesures de l'allongement sont effectuées dans la zone médiane entre les coins de chacune des parois de la lingotière.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les mesures de l'allongement sont effectuées en plusieurs points sur chaque paroi de la lingotière.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que dans le cas d'une lingotière munie d'une chemise a eau, dans laquelle la paroi éloignée de la barre et la paroi côté barre forment un ensemble rigide, les mesures de l'allongement sont effectuées sur la paroi de la chemise à eau, qui est éloignée de la barre.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'on détermine la température régnant au point de mesure de l'allongement, pour en tenir compte lors de l'analyse de la valeur de mesure de l'allongement.
EP92118311A 1991-11-15 1992-10-27 Procédé de la coulée de métaux liquides dans une machine de coulée continu Expired - Lifetime EP0542024B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4137588A DE4137588C2 (de) 1991-11-15 1991-11-15 Verfahren zum Gießen von Metallen in einer Stranggießanlage
DE4137588 1991-11-15

Publications (2)

Publication Number Publication Date
EP0542024A1 EP0542024A1 (fr) 1993-05-19
EP0542024B1 true EP0542024B1 (fr) 1997-01-02

Family

ID=6444874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118311A Expired - Lifetime EP0542024B1 (fr) 1991-11-15 1992-10-27 Procédé de la coulée de métaux liquides dans une machine de coulée continu

Country Status (4)

Country Link
US (1) US5482106A (fr)
EP (1) EP0542024B1 (fr)
CA (1) CA2082887A1 (fr)
DE (2) DE4137588C2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19843033B4 (de) * 1998-09-19 2017-11-09 Sms Group Gmbh Durchbrucherkennungsverfahren für eine Stranggießkokille
DE10312923B8 (de) * 2003-03-22 2005-07-14 Sms Demag Ag Verfahren zum Bestimmen der Mess-Temperaturen in Stranggießkokillen und Stranggießkokille selbst
DE102008029742A1 (de) * 2008-06-25 2009-12-31 Sms Siemag Aktiengesellschaft Kokille zum Gießen von Metall

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501868C3 (de) * 1975-01-15 1978-08-03 Mannesmann Ag, 4000 Duesseldorf Verfahren zur Regelung und Überwachung des Stranggießens von Stahl
JPS5362733A (en) * 1976-11-18 1978-06-05 Nippon Steel Corp Horizontal continuous casting method
DE2923900C2 (de) * 1979-06-13 1984-09-13 Hoesch Werke Ag, 4600 Dortmund Verfahren zum Verhindern von Durchbrüchen des Strangs in Stranggießanlagen
DE3037048A1 (de) * 1980-10-01 1982-04-29 Böhler AG, 4000 Düsseldorf Verfahren zur steuerung des strangabzuges
US4615375A (en) * 1983-04-18 1986-10-07 United States Steel Corporation Continuous casting mold friction monitor
AU562731B2 (en) * 1985-02-01 1987-06-18 Nippon Steel Corporation Preventtion of casting defects in continuous casting
DE3541445A1 (de) * 1985-11-23 1987-06-04 Mannesmann Ag Stranggiesskokille mit temperaturmesseinrichtungen
JPS62286655A (ja) * 1986-06-05 1987-12-12 Nippon Kokan Kk <Nkk> 鋳造異常判定装置
JPH02247054A (ja) * 1989-03-20 1990-10-02 Sumitomo Metal Ind Ltd 連続鋳造におけるパウダ流入異常検出方法
US5020585A (en) * 1989-03-20 1991-06-04 Inland Steel Company Break-out detection in continuous casting

Also Published As

Publication number Publication date
US5482106A (en) 1996-01-09
DE59207803D1 (de) 1997-02-13
CA2082887A1 (fr) 1993-05-16
DE4137588A1 (de) 1993-05-19
DE4137588C2 (de) 1994-10-06
EP0542024A1 (fr) 1993-05-19

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