EP0026390A1 - Process for setting the adjustment speed of the narrow sides of a plate-ingot mould during the continuous casting of steel - Google Patents

Process for setting the adjustment speed of the narrow sides of a plate-ingot mould during the continuous casting of steel Download PDF

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Publication number
EP0026390A1
EP0026390A1 EP80105538A EP80105538A EP0026390A1 EP 0026390 A1 EP0026390 A1 EP 0026390A1 EP 80105538 A EP80105538 A EP 80105538A EP 80105538 A EP80105538 A EP 80105538A EP 0026390 A1 EP0026390 A1 EP 0026390A1
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EP
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Prior art keywords
narrow sides
mold
adjustment
continuous casting
plate
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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.)
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Application number
EP80105538A
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German (de)
French (fr)
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EP0026390B1 (en
Inventor
Manfred Dr. Wolf
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SMS Concast AG
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Concast Holding AG
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Priority to AT80105538T priority Critical patent/ATE4964T1/en
Publication of EP0026390A1 publication Critical patent/EP0026390A1/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
    • B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper

Definitions

  • the invention relates to a method for adjusting the speed of adjustment of the narrow sides of a plate mold in continuous steel casting, the distance between the narrow sides being increased during the continuous casting operation.
  • a method for controlling the cooling capacity of narrow side walls in plate molds during continuous casting is also known (CH-PS 558 687), in which the taper of the mold is set to a desired value adapted to the intended casting speed and / or the casting temperature and before the casting begins if the casting speed and / or the casting temperature changes during the casting operation, the taper is adjusted.
  • the molds are equipped with devices for measuring the cooling capacity in the narrow side walls and with adjustment devices for the narrow sides.
  • This object is achieved in that the amount of heat dissipated on the narrow sides during their adjustment is measured and the narrow sides are adjusted only so quickly that the amount of heat dissipated does not fall below a predetermined amount.
  • Running casting operation means that during the adjustment the narrow pages is to format widening a steel flow in the P lattenkokille from the upstream casting vessel from.
  • the predetermined amount for the amount of heat to be dissipated is such that if the strand shell is sufficiently in contact with the mold wall, it is strong enough at the end of the mold to prevent bulging or the occurrence of breakthroughs because measuring the amount of heat dissipated during the adjustment of the narrow sides Indicator for the contact of the narrow side with the strand formed and thus for the shell growth in the mold is given.
  • H is the amount of heat to be dissipated based on the strand surface in the mold (in kcal. m-2)
  • the number 6000 is an empirically determined constant (in kcal ⁇ min 0.5 ⁇ m -2 ) and t is the residence time (in min.) of a strand element in the mold and B is the width of the narrow side (in m).
  • the above-mentioned dwell time is calculated from the effective mold length L (in m) divided by the casting speed V (in m. Min -1 ).
  • the effective mold length L (in m) is the length from the steel bath level in the mold to the end of the mold. Since both the effective mold length L and the casting speed V are known, the amount of heat that can advantageously be dissipated is easy to calculate.
  • the adjustment of the adjustment speed is advantageously carried out fully automatically.
  • Devices for determining the amounts of heat actually removed are known per se, as are devices for adjusting the narrow sides.
  • a received actual value signal of the amount of heat dissipated on the narrow sides can be compared with the target value signal corresponding to the predetermined amount of the amount of heat to be dissipated and the resulting output signal can be used to control the adjustment speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Saccharide Compounds (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The narrow sides or side walls of a plate mold are adjusted or set, during continuous casting, while increasing their mutual spacing from one another in order to increase the sectional shape or format of the continuously cast strand. The withdrawn heat of the narrow sides of the mold is measured and used as a control magnitude for setting the adjustment speed of such narrow sides of the mold.

Description

Die Erfindung betrifft ein Verfahren zur Einstellung der Verstellgeschwindigkeit von Schmalseiten einer Plattenkokille beim Stahlstranggiessen, wobei während des laufenden Stranggiessbetriebes der Abstand zwischen den Schmalseiten vergrössert wird.The invention relates to a method for adjusting the speed of adjustment of the narrow sides of a plate mold in continuous steel casting, the distance between the narrow sides being increased during the continuous casting operation.

Es ist bekannt, die Position der Kokillenwände einer Plattenkokille, insbesondere der Schmalseiten, während des laufenden Giessbetriebes zu verändern und dadurch sowohl eine Formatanpassung als auch eine Einstellung der Konizität vorzunehmen. Um jedoch die Länge des sogenannten Uebergangsstückes des Stranges - das ist der Strangteil zwischen zuerst gegossenem und neu zu giessendem Format - und damit die Verluste möglichst klein zu halten, muss die Verstellgeschwindigkeit möglichst hoch gewählt werden. Dabei besteht aber insbesondere beim Verstellen nach aussen die Gefahr, dass Ausbauchungen und Durchbrüche am Strang entstehen können.It is known to change the position of the mold walls of a plate mold, in particular the narrow sides, during the ongoing casting operation and thereby to carry out both a format adjustment and an adjustment of the taper. However, in order to keep the length of the so-called transition piece of the strand - this is the part of the strand between the first cast and the new cast format - and thus keep the losses as small as possible, the adjustment speed must be chosen as high as possible. However, there is a particular risk that bulges and breakthroughs can occur on the strand, particularly when adjusting to the outside.

Es ist weiters bekannt, die Schmalseiten einer Plattenkokille zum Giessen von Brammensträngen mit einer Geschwindigkeit von höchstens 2 mm/sek. unter Aenderung ihres gegenseitigen Abstandes zu verstellen. Dies gibt jedoch keinen Hinweis, auf welche Art und mit welcher Geschwindigkeit die Verstellung nun tatsächlich durchgeführt werden sollte. So ist es offensichtlich, dass Störungen, wie z.B. Durchbrüche, auch innerhalb dieses angegebenen Geschwindigkeitsbereiches auftreten können.It is also known that the narrow sides of a plate mold for casting slab strands at a speed of at most 2 mm / sec. to adjust by changing their mutual distance. However, this gives no indication of the type and speed at which the adjustment should actually be carried out. So it is obvious that faults, such as breakthroughs, can also occur within this specified speed range.

Es ist weiters ein Verfahren zum Steuern der Kühlleistung von Schmalseitenwänden bei Plattenkokillen beim Stranggiessen bekannt (CH-PS 558 687), bei dem vor Giessbeginn die Konizität der Kokille auf einen, der vorgesehenen Giessgeschwindigkeit und/oder der Giesstemperatur angepassten Soll-Wert eingestellt wird und bei Veränderungen der Giessgeschwindigkeit und/oder der Giesstemperatur während des Giessbetriebes die Konizität nachgestellt wird. Dazu werden die Kokillen mit Einrichtungen zum Messen der Kühlleistung in den Schmalseitenwänden sowie mit Verstelleinrichtungen für die Schmalseiten ausgerüstet.A method for controlling the cooling capacity of narrow side walls in plate molds during continuous casting is also known (CH-PS 558 687), in which the taper of the mold is set to a desired value adapted to the intended casting speed and / or the casting temperature and before the casting begins if the casting speed and / or the casting temperature changes during the casting operation, the taper is adjusted. For this purpose, the molds are equipped with devices for measuring the cooling capacity in the narrow side walls and with adjustment devices for the narrow sides.

Es ist Aufgabe der Erfindung, ein Verfahren zur Einstellung der Verstellgeschwindigkeit von Schmalseiten einer Plattenkokille, insbesondere zum Giessen von rechteckigen Formaten, zu schaffen, das es gestattet, das Uebergangsstück klein zu halten, aber dabei die Verstellung der Kokillenschmalseiten nach aussen, während des laufenden Giessbetriebes sicher und ohne negative Auswirkungen, wie z.B. Strangausbauchungen und Durchbrüche, durchzuführen.It is an object of the invention to provide a method for adjusting the speed of adjustment of narrow sides of a plate mold, in particular for casting rectangular formats, which allows the transition piece to be kept small, but also the adjustment of the narrow sides of the mold to the outside, during ongoing casting operation safely and without negative effects, such as Strand bulges and breakthroughs.

Diese Aufgabe wird dadurch gelöst, dass die an den Schmalseiten während ihrer Verstellung abgeführte Wärmemenge gemessen und die Schmalseiten nur so schnell verstellt werden, dass die abgeführte Wärmemenge einen vorgegebenen Betrag nicht unterschreitet.This object is achieved in that the amount of heat dissipated on the narrow sides during their adjustment is measured and the narrow sides are adjusted only so quickly that the amount of heat dissipated does not fall below a predetermined amount.

Mit diesem Verfahren gelingt es, die Schmalseiten nach aussen auf ein neues, grösseres Format während des laufenden Giessbetriebes ohne nachteilige Folgen mit einer optimalen Geschwindigkeit zu verstellen. Unter laufendem Giessbetrieb wird verstanden, dass während der Verstellung der Schmalseiten zur Formatverbreiterung ein Stahlzufluss in die Plattenkokille vom vorgeordneten Giessgefäss aus erfolgt. Der vorgegebene Betrag für die abzuführende Wärmemenge ist derart, dass durch ausreichendes Anliegen der Strangschale an der Kokillenwand diese am Kokillenende genügend stark ist, um ein Ausbauchen bzw. Auftreten von Durchbrüchen zu vermeiden, weil durch das Messen der während der Verstellung abgeführten Wärmemenge der Schmalseiten ein Indikator für das Anliegen der Schmalseite an dem gebildeten Strang und damit für das Schalenwachstum in der Kokille gegeben wird.With this process it is possible to adjust the narrow sides to a new, larger format while the casting operation is in progress without any adverse consequences at an optimal speed. Running casting operation means that during the adjustment the narrow pages is to format widening a steel flow in the P lattenkokille from the upstream casting vessel from. The predetermined amount for the amount of heat to be dissipated is such that if the strand shell is sufficiently in contact with the mold wall, it is strong enough at the end of the mold to prevent bulging or the occurrence of breakthroughs because measuring the amount of heat dissipated during the adjustment of the narrow sides Indicator for the contact of the narrow side with the strand formed and thus for the shell growth in the mold is given.

Vorteilhaft entspricht dieser Betrag

Figure imgb0001
wobei H die abzuführende Wärmemenge bezogen auf die Strangoberfläche in der Kokille (in kcal . m-2), die Zahl 6000 eine empirisch ermittelte Konstante (in kcal · min0,5·m-2) und t die Verweilzeit (in min.) eines Strangelementes in der Kokille und B die Breite der Schmalseite (in m) ist. Die vorgenannte Verweilzeit wird aus der wirksamen Kokillenlänge L (in m) geteilt durch die Giessgeschwindigkeit V (in m . min -1) berechnet. Als wirksame Kokillenlänge L (in m) wird die Länge vom Stahlbadspiegel in der Kokille bis zum Kokillenende verstanden. Da sowohl die wirksame Kokillenlänge L als auch die Giessgeschwindigkeit V bekannt sind, ist die vorteilhaft abzuführende Wärmemenge einfach zu berechnen.This amount advantageously corresponds to
Figure imgb0001
 where H is the amount of heat to be dissipated based on the strand surface in the mold (in kcal. m-2), the number 6000 is an empirically determined constant (in kcal · min 0.5 · m -2 ) and t is the residence time (in min.) of a strand element in the mold and B is the width of the narrow side (in m). The above-mentioned dwell time is calculated from the effective mold length L (in m) divided by the casting speed V (in m. Min -1 ). The effective mold length L (in m) is the length from the steel bath level in the mold to the end of the mold. Since both the effective mold length L and the casting speed V are known, the amount of heat that can advantageously be dissipated is easy to calculate.

Die Einstellung der Verstellgeschwindigkeit wird vorteilhaft vollautomatisch durchgeführt. Einrichtungen zur Bestimmung der tatsächlich abgeführten Wärmemengen sind an sich bekannt, ebenso wie Vorrichtungen zur Verstellung der Schmalseiten. Ein erhaltenes Ist-Wert-Signal der abgeführten Wärmemenge an den Schmalseiten kann mit dem Soll-Wert-Signal entsprechend dem vorgegebenen Betrag der abzuführenden Wärmemenge verglichen werden und das entstehende Ausgangssignal zur Steuerung der Verstellgeschwindigkeit dienen.The adjustment of the adjustment speed is advantageously carried out fully automatically. Devices for determining the amounts of heat actually removed are known per se, as are devices for adjusting the narrow sides. A received actual value signal of the amount of heat dissipated on the narrow sides can be compared with the target value signal corresponding to the predetermined amount of the amount of heat to be dissipated and the resulting output signal can be used to control the adjustment speed.

Es ist klar, dass das Verfahren auch für die Einstellung der Verstellgeschwindigkeit nur von einer der beiden gegenüberliegenden Schmalseiten herangezogen werden kann, wobei nur die Wärmeleistungsmessung der bewegten Seite als Kontrollgrösse dient.It is clear that the method erstellgeschwindigkeit for the setting of the V can be used only by one of the two opposite narrow sides, where only the heat capacity measurement of the moved side serves as a control variable.

Claims (2)

1. Verfahren zur Einstellung der Verstellgeschwindigkeit von Schmalseiten einer Plattenkokille beim Stahlstranggiessen, wobei während des laufenden Stranggiessbetriebes der Abstand zwischen den Schmalseiten vergrössert wird, dadurch gekennzeichnet, dass die an den Schmalseiten während ihrer Verstellung abgeführte Wärmemenge gemessen und die Schmalseiten nur so schnell verstellt werden, dass die abgeführte Wärmemenge einen vorgegebenen Betrag nicht unterschreitet.1. A method for adjusting the adjustment speed of narrow sides of a plate mold in continuous steel casting, the distance between the narrow sides being increased during continuous casting operation, characterized in that the amount of heat dissipated on the narrow sides during their adjustment is measured and the narrow sides are only adjusted so quickly, that the amount of heat dissipated does not fall below a predetermined amount. 2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass der vorgegebene Betrag
Figure imgb0002
ist, wo- bei t die Verweilzeit (in min.) eines Strangelementes in der Kokille, 6000 eine Konstante (in kcal · min0,5·m-2) und B die Breite der Schmalseite (in m) ist.2. The method according to claim 1, characterized in that the predetermined amount
Figure imgb0002
 is, where t is the dwell time (in min.) of a strand element in the mold, 6000 is a constant (in kcal · min 0.5 · m -2 ) and B is the width of the narrow side (in m).
EP80105538A 1979-09-21 1980-09-16 Process for setting the adjustment speed of the narrow sides of a plate-ingot mould during the continuous casting of steel Expired EP0026390B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105538T ATE4964T1 (en) 1979-09-21 1980-09-16 METHOD OF ADJUSTING THE ADJUSTMENT SPEED OF NARROW SIDES OF A PLATE MOLD IN STEEL CONTINUOUS CASTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8564/79 1979-09-21
CH856479A CH639885A5 (en) 1979-09-21 1979-09-21 PROCEDURE FOR ADJUSTING THE ADJUSTMENT SPEED OF THE NARROW SIDE(S) OF A PLATE MILL.

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EP0026390A1 true EP0026390A1 (en) 1981-04-08
EP0026390B1 EP0026390B1 (en) 1983-10-12

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US (1) US4304290A (en)
EP (1) EP0026390B1 (en)
JP (1) JPS5653851A (en)
AT (1) ATE4964T1 (en)
AU (1) AU535406B2 (en)
BR (1) BR8006027A (en)
CA (1) CA1164624A (en)
CH (1) CH639885A5 (en)
DE (1) DE3065298D1 (en)
ZA (1) ZA805746B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083916A1 (en) * 1981-12-07 1983-07-20 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) Device for the horizontal continuous casting of metals and alloys, especially of steel
FR2541606A1 (en) * 1983-02-28 1984-08-31 Fives Cail Babcock Method for modifying the width of a continuously-cast slab without interrupting casting
FR2569361A1 (en) * 1984-08-24 1986-02-28 Fives Cail Babcock Method for adjusting the tilt of the small sides (side dams) of a continuous-casting slab ingot mould
US4580614A (en) * 1983-01-31 1986-04-08 Vereinigte Edelstahlwerke Aktiengesellschaft Cooling apparatus for horizontal continuous casting of metals and alloys, particularly steels

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CH658009A5 (en) * 1982-02-12 1986-10-15 Concast Service Union Ag METHOD AND PLATE CHILL FOR COOLING AND SUPPORTING A STRAND IN A PLATE CHOCOLATE IN A STEEL MOLDING PLANT.
JPS6213250A (en) * 1985-03-05 1987-01-22 Nippon Kokan Kk <Nkk> Method for changing width during continuous casting
WO1992002324A1 (en) * 1990-08-09 1992-02-20 Voest-Alpine International Corp. An improved method for controlling the clamping forces exerted on a continuous casting mold
DE4117073A1 (en) * 1991-05-22 1992-11-26 Mannesmann Ag TEMPERATURE MEASUREMENT SLAM CHOCOLATE
US5205345A (en) * 1991-08-07 1993-04-27 Acutus Industries Method and apparatus for slab width control
US6857464B2 (en) 2002-09-19 2005-02-22 Hatch Associates Ltd. Adjustable casting mold
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CH552423A (en) * 1972-04-18 1974-08-15 Concast Ag METHOD AND DEVICE FOR CONTROLLING HEAT EXTRACTION IN KOKILLEN DURING CONTINUOUS CASTING.
CH558687A (en) * 1973-03-30 1975-02-14 Concast Ag PROCESS FOR CONTROLLING THE COOLING CAPACITY OF NARROW SIDE WALLS IN PLATE CHILLES DURING CONTINUOUS CASTING AND PLATE CHILLES FOR CARRYING OUT THE PROCESS.
DE2440273B1 (en) * 1974-08-20 1976-02-19 Mannesmann Ag PROCEDURE FOR CONTROLLING THE CONTINUOUS CASTING PROCESS DURING STEEL PASTING, AND ARRANGEMENT FOR PERFORMING THE PROCESS
DE2320277B2 (en) * 1973-04-17 1976-07-15 Mannesnwnn AG, 4000 Düsseldorf METHOD AND DEVICE FOR DETERMINING AND MONITORING THE SHELL THICKNESS AND SHELL GROWTH OF A STRAND

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JPS5340631A (en) * 1976-09-27 1978-04-13 Kawasaki Steel Co Method of changing width of casting in continuous casting
JPS5340630A (en) * 1976-09-27 1978-04-13 Kawasaki Steel Co Method of augmenting width of cast piece in continuous casting

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
CH552423A (en) * 1972-04-18 1974-08-15 Concast Ag METHOD AND DEVICE FOR CONTROLLING HEAT EXTRACTION IN KOKILLEN DURING CONTINUOUS CASTING.
US3886991A (en) * 1972-04-18 1975-06-03 Concast Ag Method and apparatus for controlling the withdrawal of heat in molds of continuous casting installations
DE2319323B2 (en) * 1972-04-18 1975-12-18 Concast Ag, Zuerich (Schweiz) Method and device for influencing the extraction of heat in molds during continuous casting
CH558687A (en) * 1973-03-30 1975-02-14 Concast Ag PROCESS FOR CONTROLLING THE COOLING CAPACITY OF NARROW SIDE WALLS IN PLATE CHILLES DURING CONTINUOUS CASTING AND PLATE CHILLES FOR CARRYING OUT THE PROCESS.
DE2320277B2 (en) * 1973-04-17 1976-07-15 Mannesnwnn AG, 4000 Düsseldorf METHOD AND DEVICE FOR DETERMINING AND MONITORING THE SHELL THICKNESS AND SHELL GROWTH OF A STRAND
DE2440273B1 (en) * 1974-08-20 1976-02-19 Mannesmann Ag PROCEDURE FOR CONTROLLING THE CONTINUOUS CASTING PROCESS DURING STEEL PASTING, AND ARRANGEMENT FOR PERFORMING THE PROCESS
FR2282314A1 (en) * 1974-08-20 1976-03-19 Mannesmann Ag PROCESS FOR ADJUSTING THE CONTINUOUS CASTING OF THE STEEL AND DEVICE FOR IMPLEMENTING THIS PROCESS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083916A1 (en) * 1981-12-07 1983-07-20 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) Device for the horizontal continuous casting of metals and alloys, especially of steel
US4580614A (en) * 1983-01-31 1986-04-08 Vereinigte Edelstahlwerke Aktiengesellschaft Cooling apparatus for horizontal continuous casting of metals and alloys, particularly steels
FR2541606A1 (en) * 1983-02-28 1984-08-31 Fives Cail Babcock Method for modifying the width of a continuously-cast slab without interrupting casting
FR2569361A1 (en) * 1984-08-24 1986-02-28 Fives Cail Babcock Method for adjusting the tilt of the small sides (side dams) of a continuous-casting slab ingot mould

Also Published As

Publication number Publication date
DE3065298D1 (en) 1983-11-17
US4304290A (en) 1981-12-08
ATE4964T1 (en) 1983-10-15
AU6249580A (en) 1981-04-09
JPS6147623B2 (en) 1986-10-20
AU535406B2 (en) 1984-03-22
EP0026390B1 (en) 1983-10-12
ZA805746B (en) 1981-09-30
BR8006027A (en) 1981-03-31
JPS5653851A (en) 1981-05-13
CA1164624A (en) 1984-04-03
CH639885A5 (en) 1983-12-15

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