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EP0564674A1 - Procédé de démarrage d'une installation de coulée continue - Google Patents

Procédé de démarrage d'une installation de coulée continue Download PDF

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Publication number
EP0564674A1
EP0564674A1 EP92105925A EP92105925A EP0564674A1 EP 0564674 A1 EP0564674 A1 EP 0564674A1 EP 92105925 A EP92105925 A EP 92105925A EP 92105925 A EP92105925 A EP 92105925A EP 0564674 A1 EP0564674 A1 EP 0564674A1
Authority
EP
European Patent Office
Prior art keywords
stopper
opening
melt
continuous casting
plug
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.)
Withdrawn
Application number
EP92105925A
Other languages
German (de)
English (en)
Inventor
Josef Lothmann
Friedhelm Paulus
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.)
Zimmermann and Jansen GmbH
Original Assignee
Zimmermann and Jansen GmbH
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 Zimmermann and Jansen GmbH filed Critical Zimmermann and Jansen GmbH
Priority to EP92105925A priority Critical patent/EP0564674A1/fr
Publication of EP0564674A1 publication Critical patent/EP0564674A1/fr
Withdrawn legal-status Critical Current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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
    • 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

Definitions

  • the invention relates to a method for starting a continuous casting installation, in which a metallic melt is poured in a controlled manner into a continuous casting mold which is closed by means of a computer-controlled stopper and which can be closed by means of a computer-controlled stopper, and in which a continuous casting mold is closed with a start-up head and, after reaching a predetermined bath level, the continuous withdrawal is started and the further continuous casting is subjected to a bath level control, with the plug opening the bottom outflow opening with a predetermined degree of opening with a first upward movement to fill the continuous casting mold.
  • the melt must have time to solidify towards the walls of the water-cooled mold and at the start-up head before the strand is pulled out of the mold.
  • a strand shell which is firm at the beginning of the strand must be created, which can oppose the forces when the strand is pulled out in such a way that breakthroughs of the metal melt located inside the strand shell are avoided.
  • the bottom outflow opening of the intermediate vessel or the distribution channel is released in its predetermined cross section in a predetermined first filling section.
  • the first filling section is predetermined. Then a first downward movement of the stopper takes place in such a way that a reduced flow of the melt is ensured.
  • a second filling section which in turn is predetermined, the stopper is constantly held in the open position.
  • fixed periods of time are used for the position of the stopper when filling the mold.
  • the volume occupied by the start-up head is also not taken into account.
  • the melt viscosity has no influence on the duration of the first filling section.
  • the present invention has for its object to develop a method of the type mentioned in such a way that a separate adaptation to different strand formats or the like is not necessary.
  • the duration of the first filling section is therefore not constant according to the invention, but is determined by the more or less rapid increase in the melt in the mold up to a first signal level which lies below a conventional measuring section.
  • the bottom outflow opening is then closed, specifically for a predetermined dwell time, in order to ensure a secure mechanical connection of the first molten metal to the starting head or the cold chain.
  • the measures according to the invention provide a defined starting point for pulling out the cold chain.
  • the stopper dwell or closing time can be set depending on the format.
  • the first signal level is preferably defined by an electrical resistance probe protruding into the mold from above.
  • the first stopper dwell or closing time can be followed by a second stopper closing time after the bottom outlet opening has opened in the meantime.
  • the melt connected to the cold chain is then preferably pulled out after the second stopper closing time has elapsed.
  • a third stopper closing time is also conceivable after the floor outlet opening has opened for a short time between the end of the second stopper closing time and the start of the third stopper closing time. In this way, the start of pulling out the melt connected to the cold chain can also be varied or finely adjusted.
  • the method according to the invention is particularly suitable for strand formats ⁇ 160 mm mm.
  • the closing and opening times of the stopper, the opening and closing speed thereof and the respective degree of opening of the bottom outflow opening depending on the format, alloy, mold cooling water temperature, etc. should be recorded and stored in a memory for appropriate use for one new cycle under the same or similar conditions.
  • the relevant data can be accessed at any time when it comes to working with the same strand format, a similar alloy, etc.
  • Fig. 1 shows a schematic representation of a distribution channel or an intermediate vessel 1, which has a bottom outlet opening 2 on the bottom, which can be closed by a plug 3. At the bottom outlet opening 2 there is an immersion tube 4, which extends into a water-cooled continuous casting mold 5.
  • the upper section of the continuous casting mold 5 is assigned a measuring section or a measuring window 6, within which the continuous casting of an automatic bath level control is subject, and within which the target fill level 7 of the mold 5 lies.
  • the signal level determined by the lower end of the measuring section 6 is identified in FIG. 1 by the reference number "II", while the signal level defined by the upper end of the measuring section 6 is identified by the reference number "IV".
  • the cold start head 9 defines an initial level "O".
  • the curve shown on the right in FIG. 1 shows the course of the bath level height when the continuous casting mold is filled up to the regulated bath level height. Accordingly, to fill the continuous casting mold 5, the stopper 3 releases the bottom outflow opening 2 with a first upward movement from its closed position, specifically with a predetermined opening degree of preferably approximately 50 to 80%. In extreme cases, a complete opening of the bottom outlet opening 2 is also conceivable.
  • the stopper is only raised so far that an opening degree of between 50 and 80% is reached.
  • the degree of opening depends not least on the strand format.
  • the stopper 3 After the bath level in the mold 5 has risen to a predetermined height or signal level "I" below the measuring section 6, the stopper 3 is moved into the closed position and held in this position for a first predetermined time (t V ), which is sufficient to melt the melt to connect to the start head or the cold chain. The movement of the stopper 3 in the closed position takes place after a time (t O ), which is determined by the increase in the melt up to the measuring probe 8. Then the stopper 3 releases the bottom outflow opening 2 again with a second upward movement, until the melt ends Has reached measuring section 6, or - as shown in Fig. 1 - to another time (tA - t V ) has passed after which the plug 3 is moved back into the closed position.
  • the stopper 3 is held in the closed position for a second predetermined time (t C ), in order then to be opened again. Then the melt rises to the lower signal level "II" of the measuring section 6. Then the usual bath level-controlled melt supply takes place with simultaneous strand withdrawal, in such a way that the bath level adjusts to a setpoint value 7.
  • the time (t O ) is variable, while the other times (t V ), (t A ) and (t C ) can each be set as a function of the strand format, the opening and closing speed of the stopper 3, and the melt viscosity , the mold cooling water temperature, etc.
  • the degree of opening of the bottom outlet opening in the first filling section is larger than in the case of a smaller strand format.
  • a measuring probe 8 is shown in schematic longitudinal section. It comprises an outer tube, which is squeezed at various points to fix an electrical cable passed through the tube (pinch points 11 and 12).
  • the cable pipe is identified in FIG. 3 by reference number 13. It is preferably a metal tube with an outer diameter of approximately 10 mm.
  • an electrical connection is made between two power lines 14, 15, specifically via an ohmic resistor 16 and a solder joint 17, which is protected by a shrink tube 18.
  • the lower free end of the cable tube 13 is also squeezed again (pinch point 19), specifically by fixing the free ends of the electrical lines 14, 15 and by establishing a connection between these two lines.
  • the associated circuit 10 see FIG.
  • the strand is drawn off after the first (t V ) or second (t C ) plug closing time has elapsed, or after the melt has risen to the measuring window 6.
  • the stopper 3 is pulsed up and down, with the corresponding opening and closing of the bottom outflow opening 2, until the melt has reached the measuring section 6.
  • the movement of the plug "a” or the corresponding degree of opening of the floor outlet opening, the opening time "b” and the closing time “c” can be set individually.
  • a complete opening of the bottom outflow opening alternates with a complete closing of the same.
  • partial degrees of opening within certain upper and lower limits are also conceivable, ie the distance "a" of the stopper can lie between complete opening and complete closing of the bottom outflow opening.
  • the nominal bath level 7 is approximately 60% of the measuring section 6 calculated from the lower end thereof.
  • the above-described method can also be carried out in connection with a controllable slide closure arranged on an intermediate vessel.
  • a controllable slide closure arranged on an intermediate vessel.
  • plug closures it has turned out to be particularly advantageous in connection with plug closures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP92105925A 1992-04-06 1992-04-06 Procédé de démarrage d'une installation de coulée continue Withdrawn EP0564674A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92105925A EP0564674A1 (fr) 1992-04-06 1992-04-06 Procédé de démarrage d'une installation de coulée continue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92105925A EP0564674A1 (fr) 1992-04-06 1992-04-06 Procédé de démarrage d'une installation de coulée continue

Publications (1)

Publication Number Publication Date
EP0564674A1 true EP0564674A1 (fr) 1993-10-13

Family

ID=8209517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105925A Withdrawn EP0564674A1 (fr) 1992-04-06 1992-04-06 Procédé de démarrage d'une installation de coulée continue

Country Status (1)

Country Link
EP (1) EP0564674A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043097A1 (fr) * 1999-04-03 2000-10-11 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour le démarrage d' une installation de coulée continue
CN103341597A (zh) * 2013-06-19 2013-10-09 东北大学 一种连铸结晶器内保护渣下钢液温度测量装置及测量方法
CN109848386A (zh) * 2017-11-30 2019-06-07 上海梅山钢铁股份有限公司 一种连铸断流事故智能判断处置方法
EP4474081A1 (fr) 2023-08-04 2024-12-11 voestalpine Stahl GmbH Procédé de coulée continue, en particulier continue, d'une barre

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165553A (en) * 1980-05-27 1981-12-19 Saginomiya Seisakusho Inc Method for controlling molten steel level
DE3344127A1 (de) * 1982-06-09 1985-06-20 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren und vorrichtung zum fuellen einer stranggiesskokille beim angiessen eines stranges
DE3421344A1 (de) * 1984-06-08 1985-12-12 Krupp Stahl Ag, 4630 Bochum Verfahren und vorrichtung zum automatischen fuellen einer stranggiesskokille beim angiessen eines stranges
EP0214797A2 (fr) * 1985-09-02 1987-03-18 Nippon Steel Corporation Méthode pour contrôler le début de la coulée dans un procédé de coulée en continu
EP0223078A1 (fr) * 1985-10-26 1987-05-27 Metacon AG Procédé de démarrage d'une installation de coulée continue à plusieurs lignes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165553A (en) * 1980-05-27 1981-12-19 Saginomiya Seisakusho Inc Method for controlling molten steel level
DE3344127A1 (de) * 1982-06-09 1985-06-20 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren und vorrichtung zum fuellen einer stranggiesskokille beim angiessen eines stranges
DE3421344A1 (de) * 1984-06-08 1985-12-12 Krupp Stahl Ag, 4630 Bochum Verfahren und vorrichtung zum automatischen fuellen einer stranggiesskokille beim angiessen eines stranges
EP0214797A2 (fr) * 1985-09-02 1987-03-18 Nippon Steel Corporation Méthode pour contrôler le début de la coulée dans un procédé de coulée en continu
EP0223078A1 (fr) * 1985-10-26 1987-05-27 Metacon AG Procédé de démarrage d'une installation de coulée continue à plusieurs lignes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 50 (M-120)(928) 3. April 1982 & JP-A-56 165 553 ( SAGINOMIYA SEISAKUSHO K.K. ) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043097A1 (fr) * 1999-04-03 2000-10-11 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour le démarrage d' une installation de coulée continue
CN103341597A (zh) * 2013-06-19 2013-10-09 东北大学 一种连铸结晶器内保护渣下钢液温度测量装置及测量方法
CN109848386A (zh) * 2017-11-30 2019-06-07 上海梅山钢铁股份有限公司 一种连铸断流事故智能判断处置方法
EP4474081A1 (fr) 2023-08-04 2024-12-11 voestalpine Stahl GmbH Procédé de coulée continue, en particulier continue, d'une barre

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