EP0383413A2 - Continuous-casting method - Google Patents

Continuous-casting method Download PDF

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Publication number
EP0383413A2
EP0383413A2 EP90250020A EP90250020A EP0383413A2 EP 0383413 A2 EP0383413 A2 EP 0383413A2 EP 90250020 A EP90250020 A EP 90250020A EP 90250020 A EP90250020 A EP 90250020A EP 0383413 A2 EP0383413 A2 EP 0383413A2
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EP
European Patent Office
Prior art keywords
strand
mold
bath level
casting
steel
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
EP90250020A
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German (de)
French (fr)
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EP0383413A3 (en
EP0383413B1 (en
Inventor
Fritz-Peter Dr.-Ing. Pleschiutschnigg
Hans Uwe Franzen
Josef Dipl.-Ing. Glaser
Lothar Dipl.-Ing. Parschat
Manfred Pfluger
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT90250020T priority Critical patent/ATE92806T1/en
Publication of EP0383413A2 publication Critical patent/EP0383413A2/en
Publication of EP0383413A3 publication Critical patent/EP0383413A3/en
Application granted granted Critical
Publication of EP0383413B1 publication Critical patent/EP0383413B1/en
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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
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock 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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process

Definitions

  • the invention relates to a method for the continuous casting of steel according to the preamble of claim 1.
  • the invention has for its object to avoid the existing difficulties and to provide measures with which a trouble-free operation of a continuous caster for flat slabs is possible.
  • a distribution channel with immersion spouts and a height adjustment by a lifting device is known, the lifting device being program-controlled.
  • the adjustability serves to determine a specific predetermined pouring position of the distributor or the immersion spout.
  • the system described there is operated with a mold level control.
  • the lifting device and the mold level control work independently of each other.
  • Stahl und Eisen (1988), pages 284 to 285, describes a control device for distributors with immersion spouts in the case of small billet formats, the pouring and height adjustment of the distributor being included in the control during the casting.
  • the height adjustment of the distributor is used to influence the wear of the immersion spout in the slag zone.
  • the steel flows out of a distributor 1, which is mounted for height adjustment on hydraulic cylinders 2, through the immersion nozzle 3 into a mold 4.
  • the immersion nozzle 3 protrudes into the mold 4 during casting to below the bath level 5.
  • the mold is provided with a bath level measuring device 8 consisting of transmitters 6 and receivers 7, which is also able to monitor the start-up process, ie the filling of the mold with melt.
  • the filling and further pouring process can be controlled by a slide closure 9 arranged below the distributor 1, which is adjusted to a specific flow rate by means of a hydraulic cylinder 10 is adjustable.
  • the control is carried out via a slide control 11.
  • the height of the distributor 1 can be regulated by influencing the hydraulic cylinders 2 by means of a position controller 12.
  • the height controller 12 cooperates with a measuring device 13 which determines the height of the distributor 1.
  • the strand withdrawal speed is also measured at 14.
  • the measured values about the position of the slide, the bath level in the mold and the transport rollers are fed to a bath level controller 15 and controlled by this controller 15 according to predetermined values.
  • the bath level controller 15, the position controller 12 of the distributor and the measuring device 13 for the height of the distributor are connected to a superordinate guide controller 16, into which data on the temperature of the steel and the steel quality are also fed.
  • the factor K takes into account the temperature and quality of the steel, as well as the strand withdrawal speed and the position of the casting level.
  • the invention is of course also applicable to distributors without stopper or slide control of the outflow.

Abstract

The invention relates to a continuous-casting method for steel, in which molten metal is passed into a mould of rectangular cross-section from a tundish through an immersion nozzle. In order to make possible trouble-free operation in a continuous-casting plant for thin slabs, the invention proposes various measures, more particularly the automatic regulation and control of the casting-on process, the starting of strand withdrawal as a function of the liquid-metal level, the influencing of the strand withdrawal rate and of the liquid metal level in the mould and, finally, the changing of the position of the immersion nozzle as a function of casting parameters. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Stranggießen von Stahl gemäß Gattungsbegriff des Anspruchs 1.The invention relates to a method for the continuous casting of steel according to the preamble of claim 1.

Beim Stanggießen von flachen Brammen aus Stahl bereitet die regeltechnische Beherrschung des Gießprozesses große Schwierigkeiten. Insbesondere beim Einleiten der Schmelze durch einen Tauchausguß, der in die Kokille bis unter den Badspiegel des zu erzeugenden Stranges reicht, bestehen wegen der geringen Abstände zwischen Tauchausguß und Kokillenwand und des sehr engen zur Verfügung stehenden Raumes Schwierigkeiten für den störungsfreien Ablauf des Gießprozesses. Insbesondere besteht die Gefahr, daß der Tauchausguß mit der Erstarrungsfront der Strangschale in Berührung kommt, Beschädigungen der Strangschale verursacht und damit zu Durchbrüchen des Stranges führt.When continuously casting flat steel slabs, mastering the casting process from a technical point of view is extremely difficult. Especially when introducing the melt through an immersion nozzle, which extends into the mold to below the bath level of the strand to be produced, there are difficulties for the trouble-free operation of the casting process because of the small distances between the immersion nozzle and the mold wall and the very narrow space available. In particular, there is a risk that the immersion spout will come into contact with the solidification front of the strand shell, cause damage to the strand shell and thus lead to breakthroughs in the strand.

Der Erfindung liegt die Aufgabe zugrunde, die bestehenden Schwierigkeiten zu vermeiden und Maßnahmen anzugeben, mit denen ein störungsfreier Betrieb einer Stranggießanlage für flache Brammen möglich ist.The invention has for its object to avoid the existing difficulties and to provide measures with which a trouble-free operation of a continuous caster for flat slabs is possible.

Die Aufgabe wird bei dem eingangs erwähnten Verfahren gelöst mit den Merkmalen des kennzeichnenden Teiles des Anspruchs 1.The object is achieved in the method mentioned at the outset with the features of the characterizing part of claim 1.

Aus der CH-PS 619 873 ist zwar eine Verteilerrinne mit Tauchausgüssen und einer Höhenverstellbarkeit durch eine Hubeinrichtung bekannt, wobei die Hubeinrichtung programmgesteuert ist. Die Verstellbarkeit dient jedoch dazu, eine bestimmte vorgegebene Gießstellung des Verteilers bzw. des Tauchausgusses festzulegen. Außerdem wird die dort beschriebene Anlage mit einer Gießspiegelregelung betrieben. Hubeinrichtung und Gießspiegelregelung arbeiten jedoch unabhängig voneinander.From CH-PS 619 873 a distribution channel with immersion spouts and a height adjustment by a lifting device is known, the lifting device being program-controlled. However, the adjustability serves to determine a specific predetermined pouring position of the distributor or the immersion spout. In addition, the system described there is operated with a mold level control. However, the lifting device and the mold level control work independently of each other.

In Stahl und Eisen (1988), Seiten 284 bis 285, wird eine Regeleinrichtung für Verteiler mit Tauchausgüssen bei kleinen Knüppelformaten beschrieben, wobei das Angießen und die Höhenverstellung des Verteilers während des Gießens in die Regelung einbezogen sind. Die Höhenverstellbarkeit des Verteilers wird benutzt, um den Verschleiß des Tauchausgusses in der Schlackenzone zu beeinflussen.Stahl und Eisen (1988), pages 284 to 285, describes a control device for distributors with immersion spouts in the case of small billet formats, the pouring and height adjustment of the distributor being included in the control during the casting. The height adjustment of the distributor is used to influence the wear of the immersion spout in the slag zone.

Aus der DE-OS 34 23 475 ist ein Verfahren zum Stranggießen unter Einbeziehung eines gesteuerten Anfahrvorganges und anschließender Gießspiegelregelung bekannt. Wichtige Parameter des Gießprozesses sollen von einer Strangschalendickenberechnung in einem Meßwertrechner gesteuert bzw. geregelt werden. Als wichtige Parameter werden dort die Kokillenoszillation, die Gießpulvermenge, die Gießpulverqualität oder auch die Kokillenkonizität genannt.From DE-OS 34 23 475 a method for continuous casting including a controlled starting process and subsequent mold level control is known. Important parameters of the casting process are to be controlled or regulated by a strand shell calculation in a measured value computer. Mold oscillation, the amount of mold powder, the quality of the mold powder or the mold conicity are mentioned as important parameters.

Ein Hinweis auf die Bedeutung des Abstandes zwischen Tauchausgußunterkante und der in der Kokille befindlichen Strangschale ist diesen Literaturstellen jedoch nicht zu entnehmen.A reference to the importance of the distance between the lower pouring spout edge and the strand shell located in the mold cannot be found in these references.

Für die Durchführung des erfindungsgemäßen Verfahrens ist ein Aufbau einer Anlage erforderlich, wie sie im Prinzip in der beiliegenden Fig. 1 dargestellt ist. Aus einem Verteiler 1, der auf Hydraulikzylindern 2 höhenverstellbar gelagert ist, fließt der Stahl durch den Tauchausguß 3 in eine Kokille 4. Der Tauchausguß 3 ragt während des Gießens bis unterhalb des Badspiegels 5 in die Kokille 4 hinein. Die Kokille ist mit einer aus Sendern 6 und Empfängern 7 bestehenden Badspiegelmeßeinrichtung 8 versehen, die in der Lage ist, auch den Anfahrvorgang, d. h. das Füllen der Kokille mit Schmelze, zu überwachen. Der Füll- und weitere Gießvorgang kann gesteuert werden durch einen unterhalb des Verteilers 1 angeordneten Schieberverschluß 9, der mittels eines Hydraulikzylinders 10 auf eine bestimmte Durchflußmenge einstellbar ist. Die Steuerung wird über eine Schieberregelung 11 vorgenommen. Mittels eines Lagereglers 12 ist die Höhenlage des Verteilers 1 durch Beeinflussung der Hydraulikzylinder 2 regelbar. Der Höhenregler 12 wirkt mit einer Meßeinrichtung 13 zusammen, der die Höhenlage des Verteilers 1 feststellt. Ferner wird die Strangabzugsgeschwindigkeit bei 14 gemessen. Die Meßwerte über die Stellung des Schiebers, des Badspiegels in der Kokille und der Transportrollen werden einem Badspiegelregler 15 zugeführt und nach vorgegebenen Werten von diesem Regler 15 gesteuert. Der Badspiegelregler 15, der Lageregler 12 des Verteilers und die Meßeinrichtung 13 für die Höhenlage des Verteilers sind mit einem übergeordneten Führungsregler 16 verbunden, in den außerdem Daten über die Temperatur des Stahles und der Stahlqualität eingespeist werden. In diesem Führungsregler 16 wird die Strangschalendicke in der Kokille nach der Formel
Schalendicke = K√t
errechnet und durch Vorgaben an die Lageregelung 12 des Verteilers der Verteiler während des Gießprozesses derart der Strangschalenfront 14 nachgeführt, daß in jedem Fall ein Sicherheitsabstand zwischen der Unterkante des Tauchausgusses und der Erstarrungsfront der Strangschale verbleibt. Der Faktor K berücksichtigt die Temperatur und Qualität des Stahles, sowie die Strangabzugsgeschwindigkeit und die Lage des Gießspiegels.To carry out the method according to the invention, it is necessary to set up a system as shown in principle in the accompanying FIG. 1. The steel flows out of a distributor 1, which is mounted for height adjustment on hydraulic cylinders 2, through the immersion nozzle 3 into a mold 4. The immersion nozzle 3 protrudes into the mold 4 during casting to below the bath level 5. The mold is provided with a bath level measuring device 8 consisting of transmitters 6 and receivers 7, which is also able to monitor the start-up process, ie the filling of the mold with melt. The filling and further pouring process can be controlled by a slide closure 9 arranged below the distributor 1, which is adjusted to a specific flow rate by means of a hydraulic cylinder 10 is adjustable. The control is carried out via a slide control 11. The height of the distributor 1 can be regulated by influencing the hydraulic cylinders 2 by means of a position controller 12. The height controller 12 cooperates with a measuring device 13 which determines the height of the distributor 1. The strand withdrawal speed is also measured at 14. The measured values about the position of the slide, the bath level in the mold and the transport rollers are fed to a bath level controller 15 and controlled by this controller 15 according to predetermined values. The bath level controller 15, the position controller 12 of the distributor and the measuring device 13 for the height of the distributor are connected to a superordinate guide controller 16, into which data on the temperature of the steel and the steel quality are also fed. In this guide controller 16, the strand shell thickness in the mold is according to the formula
Shell thickness = K√t
calculated and tracked by specifications to the position control 12 of the distributor of the distributor during the casting process in such a way that the strand shell front 14 remains in any case a safety distance between the lower edge of the immersion nozzle and the solidification front of the strand shell. The factor K takes into account the temperature and quality of the steel, as well as the strand withdrawal speed and the position of the casting level.

Die Erfindung ist natürlich auch anwendbar bei Verteilern ohne Stopfen- oder Schieberregelung der Ausflußmenge.The invention is of course also applicable to distributors without stopper or slide control of the outflow.

Claims (1)

1. Verfahren zum Stranggießen von Stahl, bei dem Schmelze aus einem Verteiler durch einen Tauchausguß in eine Kokille mit rechteckigem Querschnitt geleitet wird,
dadurch gekennzeichnet,
daß bei einer Kokille mit einem Abstand der Breitseiten von 40 bis 100 mm und einem Abstand der Schmalseiten zwischen 200 und 2000 mm a) der Angießvorgang in Verbindung mit der Ingangsetzung des Strangabzuges automatisch geregelt oder gesteuert wird, wobei a1) der Strangabzug bei Erreichen einer gewünschten Badspiegel­höhe des Stahles in der Kokille gestartet wird und a2) der Strangantrieb über einen Regler definiert auf eine gewünschte Strangabzugsgeschwindigkeit gebracht wird, b) die Lage des Badspiegels in der Kokille durch ein System einer an sich bekannten Badspiegelregeleinrichtung erfaßt wird, c) der zunächst auf eine von der betrieblichen Sollstellung abweichenden Sstellung eingefahrene Tauchausguß in Abstimmung mit dem steigenden Badspiegel in die betriebliche Sollstellung durch eine Lageänderung des Verteilers hochge­fahren wird, wobei c1) die betriebliche Sollstellung des Tauchausgusses im Bezug zur Oberkante der Kokille eine Variable ist, welche abhängig ist von der Temperatur der Stahlschmelze, der Stahlqualität, dem K-Wert der Strangerstarrung, der Strangabzugsgeschwindig­keit und der Badspiegelhöhe errechnet und während des Gießens einen Abstand einer äußeren Unterkante des Tauchausgusses zwischen Erstarrungsfront der Strangschale und Badspiegel festlegt. 1. A process for the continuous casting of steel, in which the melt is passed from a distributor through an immersion nozzle into a mold with a rectangular cross section
characterized,
that with a mold with a distance between the broad sides of 40 to 100 mm and a distance between the narrow sides between 200 and 2000 mm a) the casting process is automatically regulated or controlled in connection with the start of the strand take-off, whereby a1) the strand withdrawal is started when a desired bath level of the steel in the mold is reached and a2) the strand drive is brought to a desired strand withdrawal speed in a defined manner via a controller, b) the position of the bath level in the mold is detected by a system of a bath level control device known per se, c) the immersion spout first retracted to a position deviating from the operational target position in coordination with the rising bath level is raised to the operational target position by a change in position of the distributor, whereby c1) the operational target position of the immersion spout in relation to the upper edge of the mold is a variable, which is dependent on the temperature of the molten steel, the steel quality, the K value of the strand solidification, the strand withdrawal speed and the bath level height and calculates a distance from an external one during the casting Defines the lower edge of the immersion spout between the solidification front of the strand shell and the bath level.
EP90250020A 1989-02-17 1990-01-26 Continuous-casting method Expired - Lifetime EP0383413B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250020T ATE92806T1 (en) 1989-02-17 1990-01-26 CONTINUOUS CASTING PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3905328A DE3905328C1 (en) 1989-02-17 1989-02-17
DE3905328 1989-02-17

Publications (3)

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EP0383413A2 true EP0383413A2 (en) 1990-08-22
EP0383413A3 EP0383413A3 (en) 1991-01-30
EP0383413B1 EP0383413B1 (en) 1993-08-11

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ID=6374608

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EP90250020A Expired - Lifetime EP0383413B1 (en) 1989-02-17 1990-01-26 Continuous-casting method

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US (1) US5004040A (en)
EP (1) EP0383413B1 (en)
JP (1) JP2963481B2 (en)
CN (1) CN1018804B (en)
AT (1) ATE92806T1 (en)
CA (1) CA2010107C (en)
DE (2) DE3905328C1 (en)
ES (1) ES2045777T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0611618A1 (en) * 1993-02-13 1994-08-24 Inteco Internationale Technische Beratung Gesellschaft mbH Method and apparatus for continuous casting of metal strands

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996026800A1 (en) * 1995-02-28 1996-09-06 Nkk Corporation Method of controlling continuous casting and apparatus therefor
JP3197230B2 (en) 1997-04-08 2001-08-13 三菱重工業株式会社 Billet continuous casting machine and casting method
CN100344395C (en) * 2005-07-28 2007-10-24 西安重型机械研究所 Hydraulic system of crystallizer full hydraulic clamping
CN105983673B (en) * 2015-02-28 2018-07-06 宝山钢铁股份有限公司 A kind of Con casting ladle based on ladle roughing slag detecting system pours control system and process control method eventually
CN104722731A (en) * 2015-04-17 2015-06-24 中冶赛迪工程技术股份有限公司 Method for eliminating central looseness of casting blank and improving density of casting blank
US10913108B2 (en) 2017-09-12 2021-02-09 Wagstaff, Inc. Dynamically positioned diffuser for metal distribution during a casting operation

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS57202952A (en) * 1981-06-04 1982-12-13 Nippon Steel Corp Controller for continuous casting of molten metal
DE3247002C1 (en) * 1982-12-18 1983-12-22 Mannesmann AG, 4000 Düsseldorf Method and device for casting thin steel strands during continuous casting
DE3423475A1 (en) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Process and apparatus for the continuous casting of molten metals, especially of molten steel

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US2825104A (en) * 1954-03-16 1958-03-04 Askania Regulator Co Method and apparatus for controlling gravity liquid flow, and for continuous metal billet casting
US3480073A (en) * 1967-11-29 1969-11-25 United States Steel Corp Apparatus for controlling discharge of metal from a vacuum degassing chamber
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JPS5376926A (en) * 1976-12-21 1978-07-07 Nippon Kokan Kk Molten metal level monitor controller of continuous casting machine that use eddy flow system range finder for measurement of molten metal level
JPS58199652A (en) * 1982-05-19 1983-11-21 Mitsubishi Heavy Ind Ltd Pressurizing type continuous casting installation
LU85878A1 (en) * 1985-05-07 1986-12-05 Arbed METHOD FOR AUTOMATICALLY CONTROLLING THE START-UP OF A METAL CONTINUOUS CASTING SYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202952A (en) * 1981-06-04 1982-12-13 Nippon Steel Corp Controller for continuous casting of molten metal
DE3247002C1 (en) * 1982-12-18 1983-12-22 Mannesmann AG, 4000 Düsseldorf Method and device for casting thin steel strands during continuous casting
DE3423475A1 (en) * 1984-06-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf Process and apparatus for the continuous casting of molten metals, especially of molten steel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 55 (M-198)[1200], 5. März 1983; & JP-A-57 202 952 (SHIN NIPPON) 13-12-1982 *
REVUE DE METALLURGIE-CIT, April 1983, Seiten 303-312; P. BARDET et al.: "Contrôle du processus de coulée continue de brames à la Sollac" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0611618A1 (en) * 1993-02-13 1994-08-24 Inteco Internationale Technische Beratung Gesellschaft mbH Method and apparatus for continuous casting of metal strands

Also Published As

Publication number Publication date
DE59002233D1 (en) 1993-09-16
EP0383413A3 (en) 1991-01-30
CN1018804B (en) 1992-10-28
JP2963481B2 (en) 1999-10-18
US5004040A (en) 1991-04-02
CA2010107C (en) 2000-04-04
ATE92806T1 (en) 1993-08-15
ES2045777T3 (en) 1994-01-16
EP0383413B1 (en) 1993-08-11
CN1044911A (en) 1990-08-29
JPH02258151A (en) 1990-10-18
CA2010107A1 (en) 1990-08-17
DE3905328C1 (en) 1990-07-19

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