EP0234491B1 - Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier - Google Patents

Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier Download PDF

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Publication number
EP0234491B1
EP0234491B1 EP87102281A EP87102281A EP0234491B1 EP 0234491 B1 EP0234491 B1 EP 0234491B1 EP 87102281 A EP87102281 A EP 87102281A EP 87102281 A EP87102281 A EP 87102281A EP 0234491 B1 EP0234491 B1 EP 0234491B1
Authority
EP
European Patent Office
Prior art keywords
casting
pouring
strip
mold
rate
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
EP87102281A
Other languages
German (de)
English (en)
Other versions
EP0234491A2 (fr
EP0234491A3 (en
Inventor
Günter Dr. Flemming
Manfred Kolakowski
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 Siemag AG
Original Assignee
SMS Schloemann Siemag 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 SMS Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT87102281T priority Critical patent/ATE56898T1/de
Publication of EP0234491A2 publication Critical patent/EP0234491A2/fr
Publication of EP0234491A3 publication Critical patent/EP0234491A3/de
Application granted granted Critical
Publication of EP0234491B1 publication Critical patent/EP0234491B1/fr
Anticipated expiration legal-status Critical
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
    • B22D11/10—Supplying or treating molten metal
    • 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
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/202—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by measuring temperature
    • 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
    • B22D11/16—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
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature

Definitions

  • the invention relates to a method for ending the casting operation of a steel strip caster with a mold with cooled narrow side walls and broad side walls, which has a pouring area which is expanded upwards in the area of the wide gaps to accommodate a pouring tube above a format-determining parallel section, and a steel strip caster for carrying out the method.
  • a further complicating factor at the end of the casting operation of a steel strip caster is that, due to the poor accessibility of the narrow mold opening, the heat-insulating slag cannot be removed, which leads to contamination of strand guiding elements when the mold exits the mold and to deflagration under the influence of sprayed cooling water.
  • the object of the invention is to provide a suitable, reliable method for ending the casting operation for steel strip casting plants, wherein the cast strip gets stuck in the pouring area or a shell breakthrough and deflagrations on the end face of the strip and slag contamination are avoided when leaving the mold.
  • the object is achieved in a method or a steel strip casting system of the type mentioned by the characterizing features of claim 1 or claim 7.
  • the new method enables regulation and automation of the process for ending the casting, thereby relieving the operating personnel, avoiding operating errors and improving overall operational safety.
  • the method takes into account in particular the fact that a heterogeneous zone of crystal growth forms within the metal sump starting from the strand shell. Different growth of the crystals of opposing walls can lead to the formation of bridges in the pouring area, which oppose a reduction in the strip thickness and hinder the strip outfeed.
  • the band is prevented from becoming stuck in the pouring area and deflagrations when the band end emerges from the mold.
  • the minimum take-off speed v Bm is 1.5 m / min.
  • the respective height of the mold level is advantageously determined by measuring the temperature within the mold walls.
  • the height of the end of the casting sump is determined by continuous force measurement on the broad side surface of the strip immediately below the mold.
  • the height of the end of the casting sump can alternatively be determined by continuous ultrasound measurement in the strip thickness direction immediately below the mold.
  • measurement data of the localization of the mold level and the bottom of the pouring sump are continuously fed to a process computer and, after comparison of the setpoint and actual value, the strip take-off speed VB and the corresponding pouring speed Ve are regulated.
  • a steel strip caster for performing the method has several thermal sensors in the pouring area and in the parallel area of the broad side walls of the mold. In order to determine the end of the casting sump, strand guiding elements immediately downstream of the mold are provided with force sensors.
  • molten steel 1 flows from a casting tank 2 from a height-adjustable stopper 3, regulated by a pouring tube 4, into a mold 5, which is formed by two opposite broad side walls 6 and two narrow side walls 7. Broad side walls 6 and narrow side walls 7 are provided with cooling channels 8. An oscillation device for the mold is indicated by arrows 9.
  • the broad side walls 6 form, above a format-determining parallel section 10, a pouring region 11 which widens upwards to accommodate the pouring tube 4.
  • the molten steel 1 flowing into the mold 5 at the start of casting connects to a starting head 12 which is fastened to a starting strand 13.
  • the resulting mold level 14 rises via the lateral outflow openings 15 of the pouring tube 4.
  • Thermosensors 16 are provided in the broad side walls to determine the current height of the casting level 14.
  • the start-up strand 13 is located at the start of casting in a strand guide consisting of rollers 17 and arranged downstream of the mold.
  • a driver 18 for conveying the starting strand 13 and then the cast steel strip 25 is arranged.
  • a measuring device 19 for determining the force acting on the belt shell 22 from the ferrostatic pressure is arranged directly below the mold 5. Force sensors 19 can be used for this.
  • the measurement data of the thermal sensors 16 and force sensors 19 are fed to a process computer 20 which, after comparison of the target value and actual value, determines the required strip take-off speed v B for the drivers 18 and the corresponding pouring speed v E for the actuator 21 of the stopper 3.
  • the liquid steel solidifies on the cooled broad side walls 6 and narrow side walls 7 of the mold 5 to form band shells 22, the thickness of which increases downwards.
  • the band shells 22 which form in the region of the enlarged pouring area 11 on the broad side walls 6 are brought closer to one another in the course of the lowering movement to the format-determining parallel section 10.
  • Fig. 3 The termination of the casting operation according to the invention is shown in Fig. 3 in the phases AC, CD, EF and FG and in Fig. 4 in diagrams for the casting speed v E and the strip take-off speed v B synchronously.
  • v E and v B are coordinated at a high level in terms of the same pouring and withdrawal volumes.
  • the pouring speed VE and strip take-off speed v are reduced uniformly from A to B to the values v Em , VBm at which the bottom of the pouring sump 23 remains below the parallel section 10.
  • the melt feed is switched off at time C, whereupon the pouring level 14 drops
  • the strip take-off speed is reduced to a value v Br at which a solidification shell 24 forms at the top of the casting level within the parallel section 10 (EF).
  • the tape take-off speed v B is increased again for the rapid removal of the tape 25 (G).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Claims (8)

1. Procédé d'arrêt de la coulée dans une installation de coulée continue de bandes en acier qui comprend une lingotière (5) qui comporte des parois latérales étroites (7) et larges (6) refroidies et qui, pour recevoir un tube de coulée (4) au-dessus d'un secteur (10) à parois parallèles qui détermine le format, comporte, dans la zone des parois latérales larges, un secteur de vercement (11) élargi vers le haut, caractérisé en ce que la vitesse VB de traction de la bande et la vitesse Ve de versement sont réduites jusqu'à ce qu'elles atteignent des valeurs VBm et Vem pour lesquelles le fond (23) du cratère liquide reste juste au-dessous du secteur (10) à parois parallèles qui détermine le format et en ce qu'après que l'arrivée de l'acier a été arrêtée et que la surface du bain (14), dont de déplacement est contrôlé, est sortie du secteur de versement (11), la vitesse VB de traction de la bande est réduite à une valeur Vgr pour laquelle la surface du bain (14) forme, à l'intérieur du secteur (10) à parois parallèles qui détermine le format, une croûte solidifiée complète (24).
2. Procédé selon la revendication 1, caractérisé en ce que, pour la coulée de bandes d'acier de 50 mm d'épaisseur, la vitesse minimale VBm de traction de la bande est de 1,5 m/min.
3. Procédé selon la revendication 1, caractérisé en ce que la position en hauteur de la surface du bain (14) est déterminée par des mesures de la température à l'intérieur des parois (6) de la lingotière.
4. Procédé selon la revendication 1, caractérisé en ce que la position en hauteur du fond (23) du cratère liquide est déterminée par des mesures dyanmométriques continues à la surface des côtés larges de la bande (23) juste au-dessous de la lingotière (5).
5. Procédé selon la revendication 1, caractérisé en ce que la position en hauteur du fond du cratère liquide (23) est déterminée par des mesures continues aux ultra-sons éffectuées dans le sens de l'épaisseur de la bande juste au-dessous de la lingotière (5).
6. Procédé selon une ou plusieurs des revendications 1 à 5, caractérisé en ce que les données résultant des mesures effectuées pour la localisation de la surface du bain et du fond du cratère liquide sont transmises en permanence à un calculateur de traitement (20), ce qui assure, après comparaison des valeurs de consigne et des valeurs effectives, le réglage de la vitesse VB de traction de la bande et de la vitesse de versement Ve correspondante.
7. Installation de coulée continue de bandes en acier qui comprend une lignotière (5), qui comporte des parois latérales étroites (7) et larges (6) refroidies et qui, pour recevoir un tube de coulée (4) au-dessus d'un secteur (10) à parois parallèles qui détermine le format, comporte, dans la zone des parois latérales larges (6), un secteur de versement (11) élargi vers le haut, un dispositif de réglage d'un dispositif d'entraînement (18) et un dispositif de réglage (21) de la section de versement, pour l'application du procédé selon une ou plusieurs des revendications 1 à 6, caractérisée en ce qu'elle comporte, dans une paroi latérale large (6), des organes (16) sensibles à la température disposés suivant une rangée qui s'étend depuis le secteur de versement (11) jusque dans le secteur (10) à parois parallèles, que la lingotière (5) est immédiatement suivie d'un appareil de mesure (19) destiné à déterminer la position en hauteur du fond (23) du cratère liquide et que les organes sensibles à la température et l'appareil de mesure sont reliés, par l'intermédiaire de lignes de transmission de signaux, à un calculateur de traitement (20).
8. Installation de coulée continue de bandes en acier selon la revendication 7, caractérisée en ce que l'appareil de mesure (19) comporte au moins un organe sensible dynamométrique.
EP87102281A 1986-02-27 1987-02-18 Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier Expired - Lifetime EP0234491B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87102281T ATE56898T1 (de) 1986-02-27 1987-02-18 Verfahren zur beendigung des giessbetriebes einer stahlbandgiessanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606289 1986-02-27
DE19863606289 DE3606289A1 (de) 1986-02-27 1986-02-27 Verfahren zur beendigung des giessbetriebes einer stahlbandgiessanlage

Publications (3)

Publication Number Publication Date
EP0234491A2 EP0234491A2 (fr) 1987-09-02
EP0234491A3 EP0234491A3 (en) 1988-01-07
EP0234491B1 true EP0234491B1 (fr) 1990-09-26

Family

ID=6295019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102281A Expired - Lifetime EP0234491B1 (fr) 1986-02-27 1987-02-18 Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier

Country Status (9)

Country Link
US (1) US4729420A (fr)
EP (1) EP0234491B1 (fr)
JP (1) JPS62203652A (fr)
KR (1) KR960002406B1 (fr)
AT (1) ATE56898T1 (fr)
CA (1) CA1288927C (fr)
DE (2) DE3606289A1 (fr)
ES (1) ES2017650B3 (fr)
IN (1) IN169181B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950014347B1 (ko) * 1986-02-27 1995-11-25 에스 엠 에스 슐레만-지이마크 악티엔게젤샤프트 강대주조공장에 있어서의 주조방법 및 장치
DE3801932A1 (de) * 1988-01-23 1989-08-03 Schloemann Siemag Ag Verfahren zum giessen eines stahlbandes in einer stahlbandgiessanlage
JP2903844B2 (ja) * 1992-03-25 1999-06-14 住友金属工業株式会社 連続鋳造における鋳込み終了方法
AT512214B1 (de) * 2011-12-05 2015-04-15 Siemens Vai Metals Tech Gmbh Prozesstechnische massnahmen in einer stranggiessmaschine bei giessstart, bei giessende und bei der herstellung eines übergangsstücks
WO2016060164A1 (fr) * 2014-10-15 2016-04-21 新日鐵住金株式会社 Dispositif, procédé et programme pour la détection de niveau de surface de métal en fusion dans un moule de coulée continue

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE887990C (de) * 1951-05-07 1953-08-27 Irving Rossi Wassergekuehlte Stranggiessform
BE624436A (fr) * 1961-11-03
US3204460A (en) * 1962-08-13 1965-09-07 United States Steel Corp System for indicating the liquid level in a continuous-casting mold or the like
DE2440273C2 (de) * 1974-08-20 1976-09-30 Mannesmann Ag Verfahren zur regelung des stranggiessprozesses beim vergiessen von stahl, sowie anordnung zur durchfuehrung des verfahrens
JPS5477229A (en) * 1977-11-22 1979-06-20 Ishikawajima Harima Heavy Ind Method and apparatus for controlling drawing speed and mold level in continuous casting machine
JPS56151147A (en) * 1980-04-24 1981-11-24 Nippon Steel Corp Method for detecting leading end position of unsolidified part of continuously cast ingot
AT378707B (de) * 1983-01-11 1985-09-25 Voest Alpine Ag Verfahren zum ueberwachen einer bogenstranggiessanlage
CH659783A5 (de) * 1983-03-29 1987-02-27 Metacon Ag Verfahren und vorrichtung zum steuern einer stranggiessanlage.
DE3400220A1 (de) * 1984-01-05 1985-07-18 SMS Schloemann-Siemag AG, 4000 Düsseldorf Kokille zum stranggiessen von stahlband
DE3423475C2 (de) * 1984-06-26 1986-07-17 Mannesmann AG, 4000 Düsseldorf Verfahren und Einrichtung zum Stranggießen von flüssigen Metallen, insbesondere von flüssigem Stahl

Also Published As

Publication number Publication date
DE3765132D1 (de) 1990-10-31
US4729420A (en) 1988-03-08
EP0234491A2 (fr) 1987-09-02
ES2017650B3 (es) 1991-03-01
KR960002406B1 (en) 1996-02-17
IN169181B (fr) 1991-09-14
CA1288927C (fr) 1991-09-17
KR870007740A (ko) 1987-09-21
DE3606289A1 (de) 1987-09-03
ATE56898T1 (de) 1990-10-15
EP0234491A3 (en) 1988-01-07
JPS62203652A (ja) 1987-09-08

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