EP0451929A2 - Method for determination and regulating the level of a metal melting bath - Google Patents

Method for determination and regulating the level of a metal melting bath Download PDF

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Publication number
EP0451929A2
EP0451929A2 EP91250076A EP91250076A EP0451929A2 EP 0451929 A2 EP0451929 A2 EP 0451929A2 EP 91250076 A EP91250076 A EP 91250076A EP 91250076 A EP91250076 A EP 91250076A EP 0451929 A2 EP0451929 A2 EP 0451929A2
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EP
European Patent Office
Prior art keywords
inert gas
regulating
bath
vessel
absolute pressure
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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.)
Granted
Application number
EP91250076A
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German (de)
French (fr)
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EP0451929A3 (en
EP0451929B1 (en
Inventor
Ewald Dipl.-Ing. Feuerstacke
Gerhard Stadtfeld
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
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Mannesmann AG
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Publication of EP0451929A3 publication Critical patent/EP0451929A3/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

Definitions

  • the invention relates to a method for determining and regulating the bath level of a molten metal in a metallurgical vessel, in particular a continuous mold of a casting plant.
  • the invention is therefore based on the object of creating a method of the generic type in which the bath level can be determined and regulated in a simple and reproducible manner.
  • the object is achieved in a method of the generic type in that inert gas is introduced into the molten metal at a certain freely selectable location within the vessel, that the absolute pressure of the inert gas introduced is measured, and that the absolute pressure measured during a flow that is different from zero is registered and from the difference between the absolute pressure and the pressure acting on the surface of the bath, the actual value of the distance of the bath surface from the location of the inert gas introduction is determined, that from this determined distance the difference to a predetermined target value is formed and as an electrical control signal of an actuator for regulating the bath level and / or the amount flowing out or withdrawn from the vessel is supplied.
  • This method according to the invention is advantageously simple to carry out. This is clear from the further embodiment of the invention, in which the inert gas is introduced at the end of a feed pipe for the melt which is immersed in the metal bath, or in that the inert gas is introduced at the bottom of the metal bath.
  • FIG. 1 shows the method according to the invention in use when filling a continuous mold of a casting plant.
  • the inert gas is removed from a pressure vessel and fed to a flow control device 2 via an adjustable throttle 1.
  • the inert gas passing through the flow control device 2 passes through a pipeline 3 to a pipe 4 which projects into the melt.
  • a pipe 4 which projects into the melt.
  • Such a tube can be realized, for example, by an additional hole in a dip spout, the hole opening into the melt at the immersing end.
  • the pipeline 3 is in direct connection with a pressure measuring device. In the event that inert gas flows into the melt to form gas bubbles, a non-zero flow is registered by the flow control device 2.
  • the pressure registered at the pressure measuring device 5 is a measure of the distance of the bath level from the inert gas inlet.
  • the pressure measuring device 5 converts the registered pressure into an electrical signal and feeds this determined actual value to a comparator 6.
  • An actuating signal is formed from the difference between a predetermined target value and the determined actual value, which is fed to an actuator 7.
  • This actuator 7 actuates, for example, the plug 8 of a distributor 9. It is also possible to influence the withdrawal speed of the strand from the mold with the control signal.
  • FIG. 2 shows the possibility of using the method for determining and regulating the bath level in a distributor 10, in which the amount of metal flowing out is controlled as a function of the fill level.
  • the inert gas is introduced near the spout 11 or at the bottom of the distributor 10 at point 13.
  • This introduction of inert gas is provided externally, as shown in FIG. 1, with the control and measuring devices described there.
  • the control signal can act on the tilt angle setting of the distributor or on the pressure acting on the bath surface.
  • FIG. 3 shows the application of the method in spray compacting.
  • the inert gas is introduced through the pouring stone 12 of the vessel.
  • the ferrostatic pressure is the decisive pressure that determines the amount of melt escaping from the spout.
  • the external supply of inert gas and the measuring and control devices are also constructed as shown in FIG. 1.
  • the control signal acts on the withdrawal speed of the emerging metal. * * Since the vessel containing the molten metal is not refilled during the leakage, it is important that the inert gas introduction with the corresponding measurement of the absolute pressure and the flow rate is carried out virtually continuously during the leakage. It is necessary here that the flow rate just exceeds the value zero at every point in time at which the absolute pressure for bath level height determination is registered and evaluated.
  • this method for determining and regulating the bath level is simple in terms of apparatus and thus finds a wide range of applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Chemically Coating (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

The invention relates to a method for determining and regulating the liquid metal level in a metallurgical vessel, especially an open-ended die of a casting plant. In order to provide a method in which the liquid level can be determined and regulated in a simple and reproducible manner, it is proposed that inert gas be introduced into the molten metal at a certain freely selectable point within the vessel, that the flow rate and absolute pressure of the inert gas introduced be measured, that the absolute pressure measured when the zero value of the flow rate is exceeded be recorded and the actual value of the distance of the surface of the liquid from the point at which the inert gas is introduced be determined from the difference between the absolute pressure and the pressure acting on the surface of the liquid, that the difference from a predetermined setpoint value be determined from the said distance ascertained and fed as an electric actuating signal to an actuator for regulating the liquid metal level and/or the quantity flowing out or withdrawn from the vessel. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Bestimmung und Regulierung des Badspiegels einer Metallschmelze in einem metallurgischen Gefäß, insbesondere einer Durchlaufkokille einer Gießanlage.The invention relates to a method for determining and regulating the bath level of a molten metal in a metallurgical vessel, in particular a continuous mold of a casting plant.

Es ist bekannt, den Badspiegel einer Metallschmelze mit Hilfe von optischen, radiometrischen oder elektrodynamischen Mitteln zu bestimmen. Ein Vorschlag dieser Art ist aus EP 0 150 670 A2 bekannt, bei dem über eine Spule in der Metallschmelze Wirbelströme induziert und gemessen werden und zur Bestimmung des Abstandes der Metallschmelze von der Spule dienen. Aus dem Vergleich von Soll- und Istwert ergibt sich dann die zu regelnde Zuflußmenge zur Metallschmelze. Ein weiteres Verfahren dieser Art, welches sich optischer Mittel bedient, ist aus der DE-OS 29 31 199 bekannt. Hierbei werden Lichtpulse über einen Spiegel auf die Badoberfläche projiziert und die reflektierten Lichtpulse detektiert. Die Laufzeit des Lichtes ist dabei ein Maß für den Abstand der Badoberfläche von der optischen Einrichtung.It is known to determine the bath level of a molten metal with the aid of optical, radiometric or electrodynamic means. A proposal of this type is known from EP 0 150 670 A2, in which eddy currents are induced and measured via a coil in the molten metal and are used to determine the distance of the molten metal from the coil. The inflow quantity to be controlled to the molten metal then results from the comparison of the target and actual values. Another method of this type, which uses optical means, is known from DE-OS 29 31 199. Here, light pulses are projected onto the bathroom surface via a mirror and the reflected light pulses are detected. The transit time of the light is a measure of the distance of the bathroom surface from the optical device.

Diese genannten Verfahren sind zum einen störanfällig und zum anderen sehr aufwendig.On the one hand, these methods are prone to failure and, on the other hand, they are very complex.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der gattungsgemäßen Art zu schaffen, bei dem der Badspiegel einfach und reproduzierbar bestimmt und reguliert werden kann.The invention is therefore based on the object of creating a method of the generic type in which the bath level can be determined and regulated in a simple and reproducible manner.

Die gestellte Aufgabe wird bei einem Verfahren der gattungsgemäßen Art dadurch gelöst, daß an einem bestimmten frei wählbaren Ort innerhalb des Gefäßes Inertgas in die Metallschmelze eingeleitet wird, daß der Absolutdruck des eingeleiteten Inertgases gemessen wird, daß der während eines von Null verschiedenen Durchflusses gemessene Absolutdruck registriert und aus der Differenz des Absolutdruckes und des auf die Oberfläche des Bades wirkenden Druckes der Istwert des Abstandes der Badoberfläche vom Ort der Inertgaseinleitung bestimmt wird, daß aus diesem ermittelten Abstand die Differenz zu einem vorgegebenen Sollwert gebildet und als elektrisches Stellsignal eines Stellgliedes zur Regulierung des Badspiegels und/oder der aus dem Gefäß ausfließenden oder abgezogenen Menge zugeführt wird. Dieses erfindungsgemäße Verfahren ist vorteilhafterweise einfach durchzuführen. Dies wird an der weiteren Ausgestaltung der Erfindung deutlich, bei der das Inertgas an dem in das Metallbad eintauchenden Ende eines Zuleitungsrohres für die Schmelze eingeleitet wird oder daß das Inertgas am Grund des Metallbades eingeleitet wird.The object is achieved in a method of the generic type in that inert gas is introduced into the molten metal at a certain freely selectable location within the vessel, that the absolute pressure of the inert gas introduced is measured, and that the absolute pressure measured during a flow that is different from zero is registered and from the difference between the absolute pressure and the pressure acting on the surface of the bath, the actual value of the distance of the bath surface from the location of the inert gas introduction is determined, that from this determined distance the difference to a predetermined target value is formed and as an electrical control signal of an actuator for regulating the bath level and / or the amount flowing out or withdrawn from the vessel is supplied. This method according to the invention is advantageously simple to carry out. This is clear from the further embodiment of the invention, in which the inert gas is introduced at the end of a feed pipe for the melt which is immersed in the metal bath, or in that the inert gas is introduced at the bottom of the metal bath.

Das erfindungsgemäße Verfahren wird anhand der Zeichnung beispielhaft erläutert.The method according to the invention is explained using the drawing as an example.

Es zeigen:

Figur 1
Durchlaufkokille mit Metallzufuhrregelung
Figur 2
Verteiler
Figur 3
Einrichtung zum Sprühkompaktieren
Show it:
Figure 1
Continuous mold with metal feed control
Figure 2
Distributor
Figure 3
Spray compacting device

Die in Figur 1 gewählte Darstellung zeigt das erfindungsgemäße Verfahren im Einsatz bei der Befüllung einer Durchlaufkokille einer Gießanlage. Hierbei wird das Inertgas einem Druckbehälter entnommen und über eine einstellbare Drossel 1 einer Durchflußkontrolleinrichtung 2 zugeführt. Das die Durchflußkontrolleinrichtung 2 passierende Inertgas gelangt über eine Rohrleitung 3 zu einem Rohr 4, welches in die Schmelze hineinragt. Ein solches Rohr kann beispielsweise durch eine zusätzliche Bohrung in einem Tauchausguß verwirklicht werden, wobei die Bohrung am eintauchenden Ende in die Schmelze mündet. Die Rohrleitung 3 steht in direkter Verbindung mit einer Druckmeßeinrichtung. Für den Fall, daß Inertgas unter Bildung von Gasblasen in die Schmelze strömt, wird ein von Null verschiedener Durchfluß von der Durchflußkontrolleinrichtung 2 registriert. Ist ein von Null verschiedener Durchfluß von Inertgas gewährleistet, dann ist der an der Druckmeßeinrichtung 5 registrierte Druck ein Maß für den Abstand des Badspiegels von der Inertgaseinleitung. Die Druckmeßeinrichtung 5 wandelt den registrierten Druck in ein elektrisches Signal um und führt diesen ermittelten Istwert einem Vergleicher 6 zu. Aus der Differenz zwischen einem vorgegebenen Sollwert und dem ermittelten Istwert wird ein Stellsignal gebildet, das einem Stellglied 7 zugeführt wird. Dieses Stellglied 7 betätigt beispielsweise den Verschlußstopfen 8 eines Verteilers 9. Dabei ist es außerdem möglich, mit dem Stellsignal Einfluß auf die Abzuggeschwindigkeit des Stranges aus der Kokille zu nehmen.The illustration selected in FIG. 1 shows the method according to the invention in use when filling a continuous mold of a casting plant. In this case, the inert gas is removed from a pressure vessel and fed to a flow control device 2 via an adjustable throttle 1. The inert gas passing through the flow control device 2 passes through a pipeline 3 to a pipe 4 which projects into the melt. Such a tube can be realized, for example, by an additional hole in a dip spout, the hole opening into the melt at the immersing end. The pipeline 3 is in direct connection with a pressure measuring device. In the event that inert gas flows into the melt to form gas bubbles, a non-zero flow is registered by the flow control device 2. If a flow of inert gas different from zero is ensured, then the pressure registered at the pressure measuring device 5 is a measure of the distance of the bath level from the inert gas inlet. The pressure measuring device 5 converts the registered pressure into an electrical signal and feeds this determined actual value to a comparator 6. An actuating signal is formed from the difference between a predetermined target value and the determined actual value, which is fed to an actuator 7. This actuator 7 actuates, for example, the plug 8 of a distributor 9. It is also possible to influence the withdrawal speed of the strand from the mold with the control signal.

Figur 2 zeigt die Einsatzmöglichkeit des Verfahrens zur Bestimmung und Regulierung des Badspiegels in einem Verteiler 10, bei dem die ausfließende Metallmenge in Abhängigkeit von der Füllhöhe gesteuert wird. Hierbei findet die Inertgaseinleitung in der Nähe des Ausgusses 11 oder am Grund des Verteilers 10 am Punkt 13 statt.FIG. 2 shows the possibility of using the method for determining and regulating the bath level in a distributor 10, in which the amount of metal flowing out is controlled as a function of the fill level. The inert gas is introduced near the spout 11 or at the bottom of the distributor 10 at point 13.

Diese Inertgaseinleitung ist dabei extern, wie in Figur 1 dargestellt, mit den dort beschriebenen Kontroll- und Meßeinrichtungen versehen. Das Stellsignal kann hierbei auf die Kippwinkeleinstellung des Verteilers oder auf den die Badoberfläche beaufschlagenden Druck einwirken.This introduction of inert gas is provided externally, as shown in FIG. 1, with the control and measuring devices described there. The control signal can act on the tilt angle setting of the distributor or on the pressure acting on the bath surface.

Figur 3 zeigt die Anwendung des Verfahrens beim Sprühkompaktieren Hierbei findet die Inertgaseinleitung durch den Ausgußstein 12 des Gefäßes statt. Der ferrostatische Druck ist dabei der maßgebliche Druck, der die durch den Ausguss austretende Schmelzenmenge bestimmt. Die externe Zufuhr von Inertgas sowie die Meß- und Kontrolleinrichtungen sind ebenfalls wie in Figur 1 dargestellt aufgebaut. Um bei diesem Verfahren die Betriebsparameter konstant zu halten, wirkt das Stellsignal auf die Abzugsgeschwindigkeit des austretenden Metalles. *
*Da das Metallschmelze enthaltende Gefäß während des Auslaufens nicht nachgefüllt wird, ist es wichtig, daß während des Auslaufens die Inertgaseinleitung mit der entsprechenden Messung des Absolutdruckes und des Durchflusses quasi kontinuierlich durchgeführt wird. Hierbei ist es notwendig, daß der Durchfluß zu jedem Zeitpunkt, zu dem der Absolutdruck zur Badspiegelhöhenbestimmung registriert und ausgewertet wird, der Durchfluß den Wert Null gerade überschreitet.FIG. 3 shows the application of the method in spray compacting. The inert gas is introduced through the pouring stone 12 of the vessel. The ferrostatic pressure is the decisive pressure that determines the amount of melt escaping from the spout. The external supply of inert gas and the measuring and control devices are also constructed as shown in FIG. 1. In order to keep the operating parameters constant in this process, the control signal acts on the withdrawal speed of the emerging metal. *
* Since the vessel containing the molten metal is not refilled during the leakage, it is important that the inert gas introduction with the corresponding measurement of the absolute pressure and the flow rate is carried out virtually continuously during the leakage. It is necessary here that the flow rate just exceeds the value zero at every point in time at which the absolute pressure for bath level height determination is registered and evaluated.

Wie aus den einzelnen Anwendungsbeispielen klar wird, ist dieses Verfahren zur Bestimmung und Regulierung des Badspiegels apparativ einfach ausgestaltet und findet somit ein weites Anwendungsspektrum.As is clear from the individual application examples, this method for determining and regulating the bath level is simple in terms of apparatus and thus finds a wide range of applications.

Claims (3)

Verfahren zur Bestimmung und Regulierung des Badspiegels einer Metallschmelze in einem metallurgischen Gefäß, insbesondere einer Durchlaufkokille einer Gießanlage,
dadurch gekennzeichnet,
daß an einem bestimmten frei wählbaren Ort innerhalb des Gefäßes Inertgas in die Metallschmelze eingeleitet wird, daß der Durchfluß und der Absolutdruck des eingeleiteten Inertgases gemessen wird, daß der beim Überschreiten des Null-Wertes des Durchflusses gemessene Absolutdruck registriert und aus der Differenz des Absolutdruckes und des auf die Oberfläche des Bades wirkenden Druckes der Istwert des Abstandes der Badoberfläche vom Ort der Inertgaseinleitung bestimmt wird, daß aus diesem ermittelten Abstand die Differenz zu einem vorgegebenen Sollwert gebildet und als elektrisches Stellsignal einem Stellglied zur Regulierung des Badspiegels und/oder der aus dem Gefäß ausfließenden oder abgezogenen Menge zugeführt wird.Method for determining and regulating the bath level of a molten metal in a metallurgical vessel, in particular a continuous mold of a casting plant,
characterized,
that inert gas is introduced into the molten metal at a certain freely selectable location within the vessel, that the flow and the absolute pressure of the introduced inert gas is measured, that the absolute pressure measured when the zero value of the flow is exceeded is recorded and from the difference between the absolute pressure and the pressure on the surface of the bath the actual value of the distance of the bath surface from the location of the inert gas inlet is determined that from this determined distance the difference to a predetermined target value is formed and as an electrical control signal an actuator for regulating the bath level and / or the outflowing from the vessel or withdrawn quantity is supplied. Verfahren zur Bestimmung und Regulierung des Badspiegels einer Metallschmelze nach Anspruch 1,
dadurch gekennzeichnet,
daß das Inertgas an dem in das Metallbad eintauchenden Ende eines Zuleitungsrohres für die Schmelze eingeleitet wird.Method for determining and regulating the bath level of a molten metal according to claim 1,
characterized,
that the inert gas is introduced at the end of a feed pipe for the melt which is immersed in the metal bath. Verfahren zur Bestimmung und Regulierung des Badspiegels einer Metallschmelze nach Anspruch 1,
dadurch gekennzeichnet,
daß das Inertgas am Grund des Metallbades eingeleitet wird.Method for determining and regulating the bath level of a molten metal according to claim 1,
characterized,
that the inert gas is introduced at the bottom of the metal bath.
EP91250076A 1990-04-11 1991-03-15 Method for determination and regulating the level of a metal melting bath Revoked EP0451929B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4012039 1990-04-11
DE4012039A DE4012039A1 (en) 1990-04-11 1990-04-11 METHOD FOR DETERMINING AND REGULATING THE BATH MIRROR OF A METAL MELT

Publications (3)

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EP0451929A2 true EP0451929A2 (en) 1991-10-16
EP0451929A3 EP0451929A3 (en) 1993-03-17
EP0451929B1 EP0451929B1 (en) 1997-05-02

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EP91250076A Revoked EP0451929B1 (en) 1990-04-11 1991-03-15 Method for determination and regulating the level of a metal melting bath

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US (1) US5170839A (en)
EP (1) EP0451929B1 (en)
JP (1) JP2977318B2 (en)
AT (1) ATE152380T1 (en)
AU (1) AU639307B2 (en)
CA (1) CA2040238C (en)
DE (2) DE4012039A1 (en)
ES (1) ES2100926T3 (en)

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FR2677284B1 (en) * 1991-06-07 1993-08-27 Pechiney Aluminium PROCESS AND APPARATUS FOR AUTOMATIC CASTING OF SEMI-PRODUCTS.
DE4344953C2 (en) * 1993-12-27 1996-10-02 Mannesmann Ag Method and device for casting a metal strip close to its final dimensions
US20050200056A1 (en) * 2004-03-12 2005-09-15 Heraeus Electro-Nite International N.V. Apparatus and method for determining fluid depth
CN101862819B (en) * 2010-06-18 2011-05-11 新星化工冶金材料(深圳)有限公司 Control mechanism capable of automatically adjusting height of liquid level and magnesium alloy plate continuously-casting system thereof

Citations (1)

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FR2417357A1 (en) * 1978-02-18 1979-09-14 British Aluminium Co Ltd METHOD AND DEVICE FOR DIRECT CASTING IN NON-FERROUS METAL SHELL

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JPS55149761A (en) * 1979-05-10 1980-11-21 Mishima Kosan Co Ltd Continuous casting control device
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JPS5740699A (en) * 1980-08-26 1982-03-06 Doryokuro Kakunenryo Method of grasping radioactive waste furnace state
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EP0451929A3 (en) 1993-03-17
ATE152380T1 (en) 1997-05-15
DE59108687D1 (en) 1997-06-05
ES2100926T3 (en) 1997-07-01
AU639307B2 (en) 1993-07-22
JPH04228249A (en) 1992-08-18
EP0451929B1 (en) 1997-05-02
CA2040238A1 (en) 1991-10-12
CA2040238C (en) 1998-06-09
AU7272591A (en) 1991-10-17
JP2977318B2 (en) 1999-11-15
US5170839A (en) 1992-12-15
DE4012039A1 (en) 1991-10-17

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