EP0538265A1 - Process and device for the continuous addition of casting agents to the surface of a melt in a continuous casting die. - Google Patents

Process and device for the continuous addition of casting agents to the surface of a melt in a continuous casting die.

Info

Publication number
EP0538265A1
EP0538265A1 EP91909146A EP91909146A EP0538265A1 EP 0538265 A1 EP0538265 A1 EP 0538265A1 EP 91909146 A EP91909146 A EP 91909146A EP 91909146 A EP91909146 A EP 91909146A EP 0538265 A1 EP0538265 A1 EP 0538265A1
Authority
EP
European Patent Office
Prior art keywords
storage container
screw conveyor
removal
pouring
bath level
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
EP91909146A
Other languages
German (de)
French (fr)
Other versions
EP0538265B1 (en
Inventor
Hans-Friedrich Smets
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.)
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Original Assignee
Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
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Publication date
Application filed by Intocast GmbH Feuerfestprodukte und Giesshilfsmittel filed Critical Intocast GmbH Feuerfestprodukte und Giesshilfsmittel
Publication of EP0538265A1 publication Critical patent/EP0538265A1/en
Application granted granted Critical
Publication of EP0538265B1 publication Critical patent/EP0538265B1/en
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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
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the invention relates to a method and a device of the type corresponding to the preambles of claims 1 and 3, respectively.
  • the preferred field of application of the invention is the addition of continuous casting powder to the bath level of a continuous casting mold.
  • These continuous casting powders form a layer a few centimeters thick on the bath level. They partially melt in the area in contact with the bath level and form a slag that settles between the mold wall and the solidifying strand.
  • the still loose upper part of the casting powder layer has a heat-insulating effect and prevents excessive heat loss from the upper end of the strand.
  • the casting powder By taking the molten casting powder slag with it, the casting powder continues to be consumed. This consumption is in the range of about 0.3 kg or 0.8 kg per ton of steel. This quantity must therefore be continuously replenished, maintaining a uniform layer thickness essential for the quality of the strand surface. Uniformity must be sought in both the vertical and horizontal directions.
  • the uniformity in the vertical direction means that a certain layer thickness is maintained during the entire casting period in order to always ensure the availability of a sufficient amount of slag.
  • the uniformity in the horizontal direction means the uniformity of this layer thickness over the strand cross-section in order to achieve a uniform insulating effect at every point.
  • a flat conveying channel attached to the lower end of a storage container extends from the side to over the continuous casting mold.
  • a gas distribution space into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable.
  • air When air is blown in, it is conveyed from the storage container through the channel to the bath level in the continuous casting mold. If the air is turned off, the promotion also stops.
  • the control takes place via temperature sensors, which are arranged above the mold. When the casting powder layer on the bath mirror becomes thinner and the insulating effect of the powder diminishes, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. An improvement in the strand surface compared to manual powder addition is therefore not to be expected in the case of the automatic powder addition described. This has also been confirmed in practice. Pneumatic-mechanical dosing devices have not proven themselves and have not found their way into practice.
  • the granules from casting aids in particular from continuous casting powder, which in themselves allow a functioning addition only under the action of gravity, are so low in abrasion resistance, especially when they are present as a hollow sphere, that they are destroyed during pneumatic conveying and partly as powder or Fragments get into the storage container of the addition device. Then, however, the already mentioned effect of blockage occurs in the feed pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
  • the invention is based on the object of specifying a method and a device for the automatic addition of pouring aids to the bath level of continuous casting molds, in which it is possible to work with powdered pouring aids and yet a reliable, metered addition is possible.
  • This object is achieved in its procedural aspect by that in claim 1, in its device aspect by the invention reproduced in claim 3.
  • the conveyor device can be designed as a screw conveyor.
  • This construction is space-saving simple and robust and leads to a desired forced conveyance of the powdered pouring aid.
  • the screw conveyor extends across the bath level, cooling, preferably with air, is recommended.
  • the immersion tube extends from the tundish into the upper end of the strand in the immediate vicinity of the screw conveyor. This dip tube has temperatures in the order of 1000 ° C.
  • the self-regulating removal points can be formed according to claim 6 by removal shafts which are attached to the bottom of the screw conveyor.
  • the extraction nozzles can be made of aluminum, for example. With their lower edge, they form the boundary of the removal point up to which the cone of ascent rises. In the event of wear, the tapping nozzles are simply replaced, as is the case with another pouring Gel Stand is to be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
  • the dimensioning of the conveying capacity according to claim 8 ensures, under the given operating conditions, that the screw conveyor is filled to a large extent, and thus uniformly, at the individual extraction ports, so that even quantities emerge.
  • the fluidization according to claim 9 loosens the amount of powdered pouring aid in the storage container and makes it quasi flowable, so that it easily passes from the storage container into the screw conveyor.
  • FIG. 1 shows a view of the addition device according to the invention
  • FIG. 2 shows a view of an individual removal point above the bath level.
  • FIG. 1 shows a storage container 1 which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2.
  • a storage container 1 which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2.
  • fluidizing floors 4 are attached on the inside, which are supplied with air via supply lines 5 and fluidize the continuous casting powder 6 located in the storage container 1, ie, decompose it into a swirled state, in which it is easy to move.
  • the fluidized continuous casting powder 6 flows from the outlet 7 at the lower end of the conical part 3 of the storage container 1 via the line 8 into the inlet 9 of a horizontal screw conveyor 10, which is driven by a drive motor 11 is driven.
  • the screw conveyor 10 extends just above the upper end of the continuous casting mold 12. It has an outer diameter of only about 50 mm and therefore still fits well into the narrow space between the upper edge 13 of the continuous casting mold 12 and the underside 14 of the above the continuous casting mold 12 arranged tundishs
  • the dip tube 17 merges into the continuous casting mold 12 in the bottom of the tundish 15.
  • the dip tube 17 extends into the melt located in the continuous casting mold 12, i.e. extends to below the bath level 18, which is kept at a constant height by suitable measures.
  • the screw conveyor 10 comprises a tubular housing 22, in which a transport screw 23 is rotatably arranged. At the removal points 19, the housing 22 has openings 24 to which the removal shafts 20 are welded. The material conveyed past the opening 24 by the screw conveyor 23 emerges downward through the opening 24 and, since it is flowable, forms a cone 25 of powdered pouring aid. When the pouring cone 25 has risen to the lower limit 21 of the removal shaft 20, no more powdery pouring agent 6 flows in again. However, this occurs again as soon as the pouring cone 25 drops as a result of the melting of the powdered pouring aid 6. This type of self-regulation is known as the "chicken feeding" principle. An equilibrium state is established in which the continuous casting powder flows slowly in accordance with the consumption.
  • a uniform layer 26 of molten pouring aid ie a slag, is formed, which extends over the meniscus of the bath level 18 from the strand between its outside and the inner circumference of the continuous casting mold 12 is taken away.
  • consumption occurs which causes the pouring cone 25 to drop. It must be ensured that a certain minimum pouring height 27 of powdered casting aid is maintained so that the thermal insulation effect is maintained.
  • the lower limit of the removal point 19 is not formed on the removal shaft 20 itself, but rather on a removal nozzle 28, for example made of aluminum, which can be replaced when its lower end is melted or when another one is pushed over it Height of the cone 25 is desired.
  • the pressure inside the screw conveyor 10 but also plays a certain role for the discharge quantities and should therefore be as constant as possible, which means that the degree of powder filling in the screw conveyor 10 should be as constant as possible over its entire length. This is the only way to ensure that the pressure is largely the same everywhere, which contributes to the fact that all tapping points 19, regardless of their location, actually have the same amounts of powder flowing out.
  • the constancy of the degree of powder filling is the better, the greater the conveying capacity of the screw conveyor 10 in relation to the quantities withdrawn. In practice, the funding would have to be at least twice these amounts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
  • General Induction Heating (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Furnace Details (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Screw Conveyors (AREA)
  • Coating With Molten Metal (AREA)

Abstract

PCT No. PCT/DE91/00398 Sec. 371 Date Jan. 11, 1993 Sec. 102(e) Date Jan. 11, 1993 PCT Filed May 17, 1991 PCT Pub. No. WO92/00819 PCT Pub. Date Jan. 23, 1992.A pulverulent casting auxiliary (6) is removed from a supply tank (1) in the fluidized state and conveyed through a screw conveyor (10) via a continuous-casting mold (12). At the end of the screw conveyor (10) a return line (30) is provided via which the quantity of casting auxiliary (6) not removed at the removal points (19) disposed over the bath surface (18) is returned into the supply tank (1) in a circulating manner.

Description

Verfahren und Vorrichtung zur kontinuierlichen Zugabe von Gießhilfsmitteln auf den Spiegel einer Schmelze in einer Stranggießkokille Method and device for the continuous addition of casting aids to the level of a melt in a continuous casting mold
Die Erfindung bezieht sich auf eine Verfahren und eine Vorrichtung der den Oberbegriffen der Ansprüche 1 bzw. 3 entsprechenden Art.The invention relates to a method and a device of the type corresponding to the preambles of claims 1 and 3, respectively.
Das bevorzugte Anwendungsgebiet der Erfindung ist die Zugabe von Stranggießpulver auf den Badspiegel einer Strang¬ gießkokille. Diese Stranggießpulver bilden eine einige Zen¬ timeter dicke Schicht auf dem Badspiegel. Sie schmelzen in ihrem mit dem Badspiegel in Berührung stehenden Bereich teilweise auf und bilden eine Schlacke, die sich zwischen die Kokillenwand und den erstarrenden Strang setzt. Der noch lockere obere Anteil der Gießpulverschicht wirkt wär¬ meisolierend und verhindert einen zu starken Wärmeverlust des oberen Strangendes.The preferred field of application of the invention is the addition of continuous casting powder to the bath level of a continuous casting mold. These continuous casting powders form a layer a few centimeters thick on the bath level. They partially melt in the area in contact with the bath level and form a slag that settles between the mold wall and the solidifying strand. The still loose upper part of the casting powder layer has a heat-insulating effect and prevents excessive heat loss from the upper end of the strand.
Durch die Mitnahme der geschmolzenen Gießpulverschlacke tritt ein fortlaufender Verbrauch des Gießpulvers ein. Die¬ ser Verbrauch liegt im Bereich von etwa 0,3kg bzw.0,8 kg pro Tonne Stahl. Diese Menge muß also fortlaufend nachgelie¬ fert werden, wobei die Einhaltung einer gleichmäßigen Schicht¬ dicke für die Qualität der Strangoberfläche wesentlich ist. Die Gleichmäßigkeit muß sowohl in vertikaler als auch in horizontaler Richtung angestrebt werden. Die Gleichmäßigkeit in vertikaler Richtung bedeutet die Einhaltung einer bestimm¬ ten Schichtdicke während der ganzen Gießdauer, um stets die Verfügbarkeit einer ausreichenden Menge an Schlacke zu gewährleisten. Die Gleichmäßigkeit in horizontaler Rich¬ tung bedeutet die Gleichmäßigkeit dieser Schichtdicke über den Strangguerschnitt, um eine gleichmäßige Isolierwirkung an jeder Stelle zu erzielen.By taking the molten casting powder slag with it, the casting powder continues to be consumed. This consumption is in the range of about 0.3 kg or 0.8 kg per ton of steel. This quantity must therefore be continuously replenished, maintaining a uniform layer thickness essential for the quality of the strand surface. Uniformity must be sought in both the vertical and horizontal directions. The uniformity in the vertical direction means that a certain layer thickness is maintained during the entire casting period in order to always ensure the availability of a sufficient amount of slag. The uniformity in the horizontal direction means the uniformity of this layer thickness over the strand cross-section in order to achieve a uniform insulating effect at every point.
Der Ausgangspunkt der Entwicklung war die manuelle Zu¬ gabe des Stranggießpulvers. Die Gleichmäßigkeit ist hierbei nicht immer gewährleistet. Auch erfordert diese Methode die Anwesenheit und ständige Aufmerksamkeit einer Bedienungs¬ person über die gesamte mehrstündige Gießsequenz.The starting point of the development was the manual addition of the continuous casting powder. Uniformity is not always guaranteed. This method also requires the presence and constant attention of an operator over the entire pouring sequence of several hours.
Es wurde schon bald versucht, die Zugabe von Gießhilfs¬ mitteln beim Stranggießen zu automatisieren. Dafür sind zwei unterschiedliche Verfahrensweisen bekannt, nämlich pneumatisch-mechanisch oder rein mechanisch mit Förderern arbeitende Einrichtungen auf der einen Seite und auf der anderen Seite Einrichtungen, die unter Ausnutzung der Schwer-' kraft arbeiten.An attempt was soon made to automate the addition of pouring aids during continuous casting. For this purpose, two different procedures are known, namely pneumatic-mechanical or purely mechanical devices with conveyors on the one hand and devices on the other hand that work using gravity.
Bei einem bekannten Gerät der ersten Gruppe reicht ein am unteren Ende eines Vorratsbehälters angesetzter flacher Förderkanal von der Seite her bis über die Stranggießkokille. Unterhalb des Vorratsbehälters befindet sich ein Gasvertei¬ lungsraum, in den Luft eingeblasen werden kann, die das in dem Kanal befindliche Gießpulver fluidisiert und transport¬ fähig macht. Wenn Luft eingeblasen wird, erfolgt also eine Förderung aus dem Vorratsbehälter durch den Kanal auf den Badspiegel in der Stranggießkokille. Wenn die Luft abge¬ stellt wird, hört auch die Förderung auf. Die Steuerung erfolgt über Temperaturmeßfühler, die oberhalb der Kokille angeordnet sind. Wenn die Gießpulverschicht auf dem Bad¬ spiegel dünner wird und die Isolierwirkung des Pulvers nach¬ läßt, steigt die Temperatur an und wird die Zugabe des Pul¬ vers ausgelöst. Diese erfolgt also nicht kontinuierlich, sondern intermittierend, ähnlich wie bei der Handaufgabe. Daher ist bei der geschilderten automatischen Pulverzugabe eine Verbesserung der Strangoberfläche gegenüber der manu¬ ellen Pulverzugabe nicht zu erwarten. Dies hat sich auch in der Praxis bestätigt. Pneumatisch-mechanisch dosierende Einrichtungen haben sich nicht bewährt und keinen Eingang in die Praxis gefunden.In a known device of the first group, a flat conveying channel attached to the lower end of a storage container extends from the side to over the continuous casting mold. Below the storage container there is a gas distribution space into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable. When air is blown in, it is conveyed from the storage container through the channel to the bath level in the continuous casting mold. If the air is turned off, the promotion also stops. The control takes place via temperature sensors, which are arranged above the mold. When the casting powder layer on the bath mirror becomes thinner and the insulating effect of the powder diminishes, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. An improvement in the strand surface compared to manual powder addition is therefore not to be expected in the case of the automatic powder addition described. This has also been confirmed in practice. Pneumatic-mechanical dosing devices have not proven themselves and have not found their way into practice.
Die rein nach dem Schwerkraftprinzip arbeitenden Geräte sind zunächst ebenfalls für die Verwendung von pulverförmi- gem Gießhilfsmittel konzipiert worden. Von einem Vorrats¬ behälter führt ein geneigtes Zugaberohr bis über den Bad¬ spiegel. Die abgegebene Menge bildet auf dem Badspiegel einen Schüttkegel, der bis zum unteren Ende des Zugabe¬ rohrs hochsteigt. Es rutscht dann kein Pulver mehr nach. Erst wenn der Schüttkegel durch den Verbrauch sich von dem unteren Ende des Rohres wieder entfernt, rieselt neues Pul¬ ver nach. Diese Art der selbsttätigen Regulierung wird auch "Chicken feeding"-Prinzip genannt, weil es bei Fütterungs¬ automaten verbreitet ist. Es hat sich jedoch gezeigt, daß mit dieser Methode pulverförmige Gießhilfsmittel nicht zu¬ verlässig aufbringbar sind, da es selbst bei steiler ange¬ ordneten Zugaberohren (Winkel ^ 30 ) zu Verstopfungen kommt.The devices, which work purely on the principle of gravity, were initially also designed for the use of powdered casting aids. An inclined addition pipe leads from a storage container up to the bath level. The amount dispensed forms a pouring cone on the bath level, which rises up to the lower end of the feed pipe. Then no more powder slips. Only when the cone of consumption moves away from the lower end of the tube again does new powder trickle in. This type of automatic regulation is also called the "chicken feeding" principle because it is common in automatic feeders. It has been shown, however, that powdery pouring aids cannot be reliably applied with this method, since blockages occur even with steeply arranged metering tubes (angle ^ 30).
Es war daher erforderlich, das Gießhilfsmittel zu gra¬ nulieren, um der Verstopfungsneigung entgegenzuwirken. Mit einem Granulat ließ sich die Zugabe unter reiner Schwere¬ wirkung funktionssicherer gestalten. Bei exakter Gießspie¬ gelregelung war die Dicke der Granulatschicht stets gleich und somit ständig eine gleichmäßige Isolierung und eine der spezifischen Schlackenbildungsaktivität des Granulats entsprechende konstante Verfügbarkeit an Schlacke gewähr¬ leistet.It was therefore necessary to granulate the pouring aid in order to counteract the tendency to block. With a granulate, the addition could be made functionally reliable with pure gravity. With precise casting level control, the thickness of the granulate layer was always the same and thus a constant insulation and a constant availability of slag corresponding to the specific slag formation activity of the granulate was guaranteed.
Die Anforderungen an die Qualität des Granulats sind aber hoch. Es zeigte sich, daß Granulate, deren Kornband weniger gleichmäßig war, wie reine Pulver zu Verstopfungen im Zugaberohr führten. Die Verwendung eines klassierten Granulats mit einem engen Kornband bedeutet eine erhebliche wirtschaftliche Belastung des Verfahrens.However, the requirements for the quality of the granulate are high. It was found that granules whose grain size was less uniform, like pure powder, led to blockages in the addition pipe. The use of a classified Granules with a narrow grain band mean a considerable economic burden on the process.
Wenn die kontinuierliche Zugabe von Gießpulvergranula¬ ten einen wirtschaftlichen Sinn haben soll, ist außerdem Voraus¬ setzung, daß das Granulat pneumatisch gefördert werden kann und das Granulat auf der Gießbühne nicht in Säcken oder Big Bags mit Flurfδrderzeugen oder Hubfahrzeugen zur Beschickung des Vorratsbehälters der Zugabe orrichtung transportiert werden muß. Nur wenn die pneumatische Förderung möglich ist, kann das Granulat in einem Silofahrzeug angeliefert, in einen auf dem Hüttenflur stehenden Silo mit erheblichem Nutzvolumen eingeblasen und von dort aus zu dem Vorratsbehälter pneuma¬ tisch gefördert werden, um auf diese Weise eine kontinuier¬ liche Bereitstellung des Gießpulvers ohne Transportmanipula¬ tionen auf der Gießbühne zu gewährleisten, die zusätzliche Arbeitskräfte erfordern. Die pneumatische Förderung ist also - vor allem beim Sequenzguß - Grundbedingung für die Kontinu¬ ität des gesamten Gießablaufes und der Personaleinsparung.If the continuous addition of mold powder granules is to make economic sense, it is also a prerequisite that the granulate can be conveyed pneumatically and the granulate on the casting platform cannot be packed in bags or big bags with materials handling equipment or lifting vehicles for loading the storage container of the feed device must be transported. Only if the pneumatic conveying is possible can the granulate be delivered in a silo vehicle, blown into a silo with considerable usable volume standing in the hut corridor and conveyed pneumatically from there to the storage container, in order in this way a continuous supply of the To guarantee casting powder without transport manipulations on the casting platform, which require additional labor. Pneumatic conveying is therefore - especially in the case of sequence casting - a basic requirement for the continuity of the entire casting process and the personnel savings.
Die Granulate aus Gießhilfsmitteln, insbesondere aus Stranggießpulver, die an sich eine funktionierende Zugabe nur unter Schwerkraftwirkung erlauben, sind jedoch, vor allem wenn sie als Hohlkugel vorliegen, in ihrer Abriebfestigkeit so gering, daß sie bei einer pneumatischen Förderung zerstört werden und teilweise als Pulver oder Bruchstücke in den Vor¬ ratsbehälter der Zugabevorrichtung gelangen. Dann aber tritt der bereits erwähnte Effekt der Verstopfung in dem Zugabe¬ rohr auf. Das Granulat ist also außer aus wirtschaftlichen Gründen auch aus technischen Gründen für eine praktikable Dosierung von Stranggießpulver nicht geeignet.The granules from casting aids, in particular from continuous casting powder, which in themselves allow a functioning addition only under the action of gravity, are so low in abrasion resistance, especially when they are present as a hollow sphere, that they are destroyed during pneumatic conveying and partly as powder or Fragments get into the storage container of the addition device. Then, however, the already mentioned effect of blockage occurs in the feed pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur automatischen Zugabe von Gießhilfs¬ mitteln auf den Badspiegel von Stranggießkokillen anzugeben, bei welchen mit pulverförmigem Gießhilfsmittel gearbeitet werden kann und dennoch eine betriebssichere dosierte Zugabe möglich ist. Diese Aufgabe wird in ihrem verfahrensmäßigen Aspekt durch die in Anspruch 1, in ihrem vorrichtungsmäßigen Aspekt durch die in Anspruch 3 wiedergegebene Erfindung gelöst.The invention is based on the object of specifying a method and a device for the automatic addition of pouring aids to the bath level of continuous casting molds, in which it is possible to work with powdered pouring aids and yet a reliable, metered addition is possible. This object is achieved in its procedural aspect by that in claim 1, in its device aspect by the invention reproduced in claim 3.
Versuche haben gezeigt, daß die zirkulierende Förderung des pulverförmigen Gießhilfsmittels mit fortlaufender Ent¬ nahme des jeweils benötigten Anteils oberhalb des Badspie¬ gels eine zuverlässige, von Verstopfungen freie Betriebsweise ermöglicht. Es treten hierbei keine lokalen Druckerhöhungen auf, die zu einer Kompaktierung des pulverförmigen Gießhilfs¬ mittels und zu Verstopfungen Anlaß sein könnten.Experiments have shown that the circulating conveyance of the powdered pouring aid with continuous removal of the required portion above the bath level enables a reliable operation free of blockages. There are no local pressure increases which could cause compacting of the powdered pouring aid and blockages.
Wenn die Förderung des Gießhilfsmittels an mindestens einer Stelle des Förderweges durch eine Fluidisierung unter¬ stützt wird (Anspruch 2) , ergibt sich eine Lockerung des Förderguts, die seiner Beweglichkeit zugute kommt.If the conveying of the pouring aid is supported by fluidization at at least one point on the conveying path (claim 2), the material to be conveyed is loosened and benefits its mobility.
Die Fördervorrichtung kann gemäß Anspruch 4 als Schnek- kenförderer ausgebildet sein.The conveyor device can be designed as a screw conveyor.
Diese Bauweise ist raumsparend einfach und robust und führt zu einer erwünschten Zwangsförderung des pulverförmigen Gießhilfsmittels.This construction is space-saving simple and robust and leads to a desired forced conveyance of the powdered pouring aid.
Da sich der Schneckenförderer quer über den Badspiegel erstreckt, empfiehlt sich gemäß Anspruch 5 eine Kühlung, vorzugsweise mit Luft. Der Badspiegel selbst ist zwar durch das pulverförmige Gießhilfsmittel abgedeckt, doch erstreckt sich in unmittelbarer Nähe des Schneckenförderers das Tauch¬ rohr aus dem Tundish in das obere Ende des Strangs. Dieses Tauchrohr hat Temperaturen in der Größenordnung von 1000° C.Since the screw conveyor extends across the bath level, cooling, preferably with air, is recommended. Although the bath level itself is covered by the powdery pouring aid, the immersion tube extends from the tundish into the upper end of the strand in the immediate vicinity of the screw conveyor. This dip tube has temperatures in the order of 1000 ° C.
Die selbstregulierenden Entnahmestellen können gemäß Anspruch 6 durch Entnahmeschächte gebildet sein, die unten an dem Schneckenförderer angebracht sind.The self-regulating removal points can be formed according to claim 6 by removal shafts which are attached to the bottom of the screw conveyor.
Eine vorteilhafte Ausgestaltung ist Gegenstand des An¬ spruchs 7. Die Entnahmestutzen können beispielsweise aus Aluminium bestehen. Sie bilden mit ihrem unteren Rand die Begrenzung der Entnahmestelle, bis zu der der Schüttkegel jeweils aufsteigt. Bei Verschleiß werden die Entnahmestutzen einfach ausgewechselt, ebenso wenn auf eine andere Schüttke- gelhöhe übergegangen werden soll, ohne daß der ganze Schnecken förderer in seiner Höhe über der Stranggießkokille verändert werden muß.An advantageous embodiment is the subject of claim 7. The extraction nozzles can be made of aluminum, for example. With their lower edge, they form the boundary of the removal point up to which the cone of ascent rises. In the event of wear, the tapping nozzles are simply replaced, as is the case with another pouring Gelhöhe is to be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
Die Bemessung der Förderleistung nach Anspruch 8 gewähr¬ leistet unter den gegebenen Betriebsbedingungen eine weit- ghend gleichmäßige Füllung des Schneckenförderers und somit gleichmäßige Verhältnisse an den einzelnen Entnahmestutzen, so daß gleichmäßige Mengen austreten.The dimensioning of the conveying capacity according to claim 8 ensures, under the given operating conditions, that the screw conveyor is filled to a large extent, and thus uniformly, at the individual extraction ports, so that even quantities emerge.
Die Fluidisierung gemäß Anspruch 9 lockert die Menge an pulverförmigem Gießhilfsmittel in dem Vorratsbehälter auf und macht sie quasi fließfähig, so daß sie leicht aus dem Vorratsbehälter in die Förderschnecke übergeht.The fluidization according to claim 9 loosens the amount of powdered pouring aid in the storage container and makes it quasi flowable, so that it easily passes from the storage container into the screw conveyor.
Für die praktische Abwicklung längerer Gießsequenzen empfiehlt es sich, ein Großsilo zur pneumatischen Nachfül¬ lung des Vorratsbehälters vorzusehen, so daß dieser nicht ständig von Hand nachgefüllt werden muß (Anspruch 10) .For the practical handling of longer pouring sequences, it is advisable to provide a large silo for the pneumatic refilling of the storage container, so that it does not have to be constantly refilled by hand (claim 10).
In der Zeichnung ist ein Ausführungsbeispiel der Er¬ findung schematisch illustriert.An exemplary embodiment of the invention is illustrated schematically in the drawing.
Fig. 1 zeigt eine Ansicht der erfindungsgemäßen Zugabe¬ vorrichtung;1 shows a view of the addition device according to the invention;
Fig. 2 zeigt eine Ansicht einer einzelnen Entnahme¬ stelle oberhalb des Badspiegels.2 shows a view of an individual removal point above the bath level.
In Fig. 1 ist ein Vorratsbehälter 1 wiedergegeben, der aus einem nur angedeuteten Großsilo 29 über eine pneumati¬ sche Fδrderleitung2gefüllt gehalten wird. In dem konischen unteren Teil 3 des Vorratsbehälters 1 sind innen Fluidisie- rungsbδden 4 angebracht, die über Zuleitungen 5 mit Luft beschickt werden und das in dem Vorratsbehälter 1 befind¬ liche Stranggießpulver 6 fluidisieren, d.h. in einen ver¬ wirbelten Zustand zersetzen, in welchem es leicht beweglich ist. Das fluidisierte Stranggußpulver 6 strömt aus dem Aus¬ laß 7 am unteren Ende des konischen Teils 3 des Vorratsbe¬ hälters 1 über die Leitung 8 in den Einlaß 9 eines horizon¬ talen Schneckenförderers 10, der von einem Antriebsmotor 11 angetrieben ist. Der Schneckenförderer 10 erstreckt sich dicht oberhalb des oberen Endes der Stranggießkokille 12. Er hat nur einen Außendurchmesser von etwa 50 mm und paßt daher noch gut in den engen Zwischenraum zwischen der Ober¬ kante 13 der Stranggießkokille 12 und der Unterseite 14 des oberhalb der Stranggießkokille 12 angeordneten Tundishs 15, der flüssigen Stahl 16 enthält, der über ein TauchrohrFIG. 1 shows a storage container 1 which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2. In the conical lower part 3 of the storage container 1, fluidizing floors 4 are attached on the inside, which are supplied with air via supply lines 5 and fluidize the continuous casting powder 6 located in the storage container 1, ie, decompose it into a swirled state, in which it is easy to move. The fluidized continuous casting powder 6 flows from the outlet 7 at the lower end of the conical part 3 of the storage container 1 via the line 8 into the inlet 9 of a horizontal screw conveyor 10, which is driven by a drive motor 11 is driven. The screw conveyor 10 extends just above the upper end of the continuous casting mold 12. It has an outer diameter of only about 50 mm and therefore still fits well into the narrow space between the upper edge 13 of the continuous casting mold 12 and the underside 14 of the above the continuous casting mold 12 arranged tundishs 15, which contains liquid steel 16, via a dip tube
17 in dem Boden des Tundishs 15 in die Stranggießkokille 12 übergeht. Das Tauchrohr 17 reicht in die in der Stranggie߬ kokille 12 befindliche Schmelze hinein, d.h. erstreckt sich bis unterhalb des Badspiegels 18, der durch geeignete Ma߬ nahmen auf gleichbleibender Höhe gehalten wird.17 merges into the continuous casting mold 12 in the bottom of the tundish 15. The dip tube 17 extends into the melt located in the continuous casting mold 12, i.e. extends to below the bath level 18, which is kept at a constant height by suitable measures.
An der Unterseite des Schneckenförderers 10 sind Ent¬ nahmestellen 19 in Gestalt von einander parallelen Ent¬ nahmeschächten 20 vorgesehen, deren untere Begrenzung 21 sich in einem vorbestimmten Abstand oberhalb des BadspiegelsOn the underside of the screw conveyor 10 there are removal points 19 in the form of parallel removal shafts 20, the lower limit 21 of which is located at a predetermined distance above the bath level
18 befindet, der im allgemeinen bei allen Entnahmeschächten gleich ist.18 is located, which is generally the same for all extraction shafts.
Der Schneckenförderer 10 umfaßt ein rohrförmiges Gehäuse 22, in welchem eine Transportschnecke 23 drehbar angeordnet ist. An den Entnahmestellen 19 besitzt das Gehäuse 22 Öff¬ nungen 24, an denen die Entnahmeschächte 20 angeschweißt sind. Das von der Transportschnecke 23 an der Öffnung 24 vorbeigeförderte Gut tritt durch die Öffnung 24 nach unten aus und bildet, da es fließfähig ist, einen Schüttkegel 25 aus pulverförmigem Gießhilfsmittel. Wenn der Schüttkegel 25 bis an die untere Begrenzung 21 des Entnahmeschachtes 20 hochgestiegen ist, fließt kein pulverförmiges Gießhilfs¬ mittel 6 mehr nach. Dies tritt aber wieder ein, sobald der Schüttkegel 25 infolge des Aufschmelzens des pulverförmigen Gießhilfsmittels 6 absinkt. Diese Art der Selbstregulierung ist als "Chicken Feeding"-Prinzip bekannt. Es stellt sich ein Gleichgewichtszustand ein, in welchem das Stranggie߬ pulver langsam nach Maßgabe des Verbrauchs nachfließt. Auf dem Badspiegel 18 der Schmelze 16 in der Strang¬ gießkokille 12 bildet sich eine gleichmäßige Schicht 26 von geschmolzenem Gießhilfsmittel, d.h. eine Schlacke, aus, die über den Meniskus des Badspiegels 18 von dem Strang zwischen seiner Außenseite und dem Innenumfang der Strang¬ gießkokille 12 mitgenommen wird. Dadurch tritt ein Ver¬ brauch ein, der zu dem Absinken des Schüttkegels 25 Anlaß ist. Es muß dafür gesorgt werden, daß eine gewisse Mindest¬ schütthöhe 27 an pulverförmigem Gießhilfsmittel erhalten bleibt, damit die Wärmeisolationswirkung aufrechterhalten wird.The screw conveyor 10 comprises a tubular housing 22, in which a transport screw 23 is rotatably arranged. At the removal points 19, the housing 22 has openings 24 to which the removal shafts 20 are welded. The material conveyed past the opening 24 by the screw conveyor 23 emerges downward through the opening 24 and, since it is flowable, forms a cone 25 of powdered pouring aid. When the pouring cone 25 has risen to the lower limit 21 of the removal shaft 20, no more powdery pouring agent 6 flows in again. However, this occurs again as soon as the pouring cone 25 drops as a result of the melting of the powdered pouring aid 6. This type of self-regulation is known as the "chicken feeding" principle. An equilibrium state is established in which the continuous casting powder flows slowly in accordance with the consumption. On the bath level 18 of the melt 16 in the continuous casting mold 12, a uniform layer 26 of molten pouring aid, ie a slag, is formed, which extends over the meniscus of the bath level 18 from the strand between its outside and the inner circumference of the continuous casting mold 12 is taken away. As a result, consumption occurs which causes the pouring cone 25 to drop. It must be ensured that a certain minimum pouring height 27 of powdered casting aid is maintained so that the thermal insulation effect is maintained.
In dem in Fig. 2 wiedergegebenen Ausführungsbeispiel ist die untere Begrenzung der Entnahmestelle 19 nicht an dem Entnahmeschacht 20 selbst ausgebildet, sondern an einem darübergeschobenen Entnahmestutzen 28 beispielsweise aus Aluminium, der ausgewechselt werden kann, wenn sein unte¬ res Ende angeschmolzen ist oder wenn eine andere Höhe des Schüttkegels 25 erwünscht ist.In the exemplary embodiment shown in FIG. 2, the lower limit of the removal point 19 is not formed on the removal shaft 20 itself, but rather on a removal nozzle 28, for example made of aluminum, which can be replaced when its lower end is melted or when another one is pushed over it Height of the cone 25 is desired.
Wesentlich ist, daß sich an dem in Fig. 1 links gelege¬ nen Ende des Schneckenförderers 10 kein Stau bildet, sondern daß die an den Entnahmestellen 19 nicht entnommene Menge an pulverförmigem Gießhilfsmittel über eine Rückleitung 30 in den Vorratsbehälter 1 zurückgeführt wird. Das Gie߬ hilfsmittel 6 zirkuliert also dauernd aus dem Vorratsbe¬ hälter 1 über die Leitung 8, den Schneckenförderer 10 und die Rückleitung 30. Nur die an den selbstregulierenden Ent¬ nahmestellen 19 jeweils benötigten Mengen werden aus dem zirkulierenden Strom fortlaufend entnommen. Zwar kommt es wegen der Selbstregulierung nach dem "Chicken-Feeding"- Prinzip nicht darauf an, daß der Schneckenförderer 10 von sich aus an allen Entnahmestellen exakt gleich dosiert; diese Dosierung erfolgt an den unteren Begrenzungen 21 der Entnahmeschächte 20, wenn sie von den Schüttkegeln 25 er¬ reicht werden. Der Druck im Innern des Schneckenförderers 10 spielt aber auch eine gewisse Rolle für die Austrittsmengen und sollte daher möglichst konstant sein, was bedeutet, daß der Pulverfüllgrad im Schneckenförderer 10 über dessen gesamte Länge möglichst konstant sein sollte. Erst dadurch ist gewährleistet, daß auch vom Druck her überall weitgehend gleiche Verhältnisse vorliegen, was dazu beiträgt, daß an allen Entnahmestellen 19, unabhängig von ihrer Lage, auch wirklich gleiche Mengen an Pulver ausfließen. Die Konstanz des Pulverfüllgrades ist umso besser, je größer die Förder¬ leistung des Schneckenförderers 10 im Verhältnis zu den entnommenen Mengen ist. Für die Praxis müßte die Förderlei¬ stung mindestens das Doppelte dieser Mengen betragen. It is essential that no jam forms at the end of the screw conveyor 10 on the left in FIG. 1, but that the amount of powdered pouring aid not removed at the removal points 19 is returned to the storage container 1 via a return line 30. The pouring aid 6 thus circulates continuously from the storage container 1 via the line 8, the screw conveyor 10 and the return line 30. Only the quantities required at the self-regulating removal points 19 are continuously withdrawn from the circulating stream. Because of the self-regulation according to the "chicken feeding" principle, it is not important that the screw conveyor 10 automatically doses exactly the same at all tapping points; this metering takes place at the lower boundaries 21 of the removal shafts 20 when they are reached by the cones 25. The pressure inside the screw conveyor 10 but also plays a certain role for the discharge quantities and should therefore be as constant as possible, which means that the degree of powder filling in the screw conveyor 10 should be as constant as possible over its entire length. This is the only way to ensure that the pressure is largely the same everywhere, which contributes to the fact that all tapping points 19, regardless of their location, actually have the same amounts of powder flowing out. The constancy of the degree of powder filling is the better, the greater the conveying capacity of the screw conveyor 10 in relation to the quantities withdrawn. In practice, the funding would have to be at least twice these amounts.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zur kontinuierlichen Zugabe von Gießhilfs¬ mittel auf den Badspiegel einer Schmelze in einer Strang¬ gießkokille, bei welchem das Gießhilfsmittel in Pulverform aus einem Vorratsbehälter durch eine Leitung an selbstregu¬ lierenden Entnahmestellen vorbeigefördert und die nicht entnommene Restmenge zirkulierend in den Vorratsbehälter zurückgefördert werden.1. A process for the continuous addition of pouring aids to the bath level of a melt in a continuous casting mold, in which the pouring aid is conveyed in powder form from a storage container through a line to self-regulating removal points and the remaining amount not removed is circulated back into the storage container .
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Förderung an mindestens einer Stelle des Zirkula¬ tionsweges durch eine Fluidisierung des Pulvers unterstützt wird.2. The method according to claim 1, characterized in that the promotion is supported at least at one point in the circulation path by fluidizing the powder.
3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2 mit einem Vorratsbehälter zur Aufnahme des Gießhilfsmittels und mit einer von dem Vorratsbehälter zu dem Bereich oberhalb des Badspiegels in der Stranggie߬ kokille führenden Fördervorrichtung, dadurch gekennzeichnet, daß die Fördervorrichtung (10) zwischen Unterseite (14) Tundish (15) und Oberseite (13) Stranggießkokille (12) hin¬ durchgeführt ist und oberhalb des Badspiegels (18) die selbst¬ regulierenden Entnahmestellen (19) aufweist, und daß eine vom Ende der Fördervorrichtung (10) in den Vorratsbehälter (1) zurückführende Rückleitung (30) vorgesehen ist. 3. Device for carrying out the method according to claim 1 or 2 with a storage container for receiving the pouring aid and with a conveyor device leading from the storage container to the area above the bath level in the continuous casting mold, characterized in that the conveying device (10) between the underside (14) Tundish (15) and top (13) continuous casting mold (12) is carried out and has the self-regulating removal points (19) above the bath level (18), and that one from the end of the conveying device (10) into the storage container (1) returning return line (30) is provided.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Fördervorrichtung (10) als Schneckenförderer aus¬ gebildet ist.4. The device according to claim 3, characterized in that the conveying device (10) is formed as a screw conveyor aus¬.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Schneckenförderer gekühlt ist.5. The device according to claim 4, characterized in that the screw conveyor is cooled.
6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekenn¬ zeichnet, daß an dem rohrförmigen Gehäuse (22) des Schnecken¬ förderers (10) oberhalb des Badspiegels (18) in der Strang¬ gießkokille (12) nach unten weisende, mit dem Innern des rohrförmigen Gehäuses (22) in Verbindung stehende Entnahme¬ schächte (20) angeordnet sind.6. The device according to claim 4 or 5, characterized gekenn¬ characterized in that on the tubular housing (22) of the screw conveyor (10) above the bath level (18) in the Strang¬ pouring mold (12) facing downwards, with the inside of the tubular housing (22) are connected to the removal shafts (20).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß auf die Entnahmeschächte (20) auswechselbare Entnahme¬ stutzen (28) aus einem niedriger als das Metall der Schmelze schmelzenden Metall aufgesetzt sind, die in einem vorbe¬ stimmten Abstand oberhalb des Badspiegels (18) enden.7. The device according to claim 6, characterized in that on the removal shafts (20) interchangeable Entnahm¬ connection (28) from a lower than the metal of the melt melting metal are placed, which at a predetermined distance above the bath level (18) end up.
8. Vorrichtung nach einem der Ansprüche 3 bis 7 , dadurch gekennzeichnet, daß die Förderleistung des Schneckenförde¬ rers mindestens das Doppelte der Entnahme an den Entnahme¬ stutzen (20) beträgt.8. Device according to one of claims 3 to 7, characterized in that the conveying capacity of the screw conveyor is at least twice the removal at the removal nozzle (20).
9. Vorrichtung nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß der Vorratsbehälter (1) ein Wirbelbett (4,4) zur Fluidisierung des pulverförmigen Gießhilfsmittels (6) aufweist und die Fördervorrichtung (10) an den Bereich des Vorratsbehälters (1) angeschlossen ist, in welchem das Gießhilfsmittel (6) in fluidisiertem Zustand vorliegt.9. Device according to one of claims 3 to 8, characterized in that the storage container (1) has a fluidized bed (4,4) for fluidizing the powdered casting aid (6) and the conveying device (10) to the region of the storage container (1) is connected in which the pouring aid (6) is in a fluidized state.
10. Vorrichtung nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß ein Großsilo (29) zur pneumatischen Nachfüllung des Vorratsbehälters (1) vorgesehen ist. 10. Device according to one of claims 3 to 9, characterized in that a large silo (29) for the pneumatic refilling of the storage container (1) is provided.
EP91909146A 1990-07-11 1991-05-17 Device for the continuous addition of casting agents to the surface of a melt in a continuous casting die Expired - Lifetime EP0538265B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4022117A DE4022117A1 (en) 1990-07-11 1990-07-11 METHOD AND DEVICE FOR THE CONTINUOUS ADMINISTRATION OF POURING AUXILIARIES ON THE MIRROR OF A MELT IN A CONTINUOUS MOLD
DE4022117 1990-07-11
PCT/DE1991/000398 WO1992000819A1 (en) 1990-07-11 1991-05-17 Process and device for the continuous addition of casting agents to the surface of a melt in a continuous casting die

Publications (2)

Publication Number Publication Date
EP0538265A1 true EP0538265A1 (en) 1993-04-28
EP0538265B1 EP0538265B1 (en) 1995-03-08

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EP (1) EP0538265B1 (en)
JP (1) JP2609389B2 (en)
AT (1) ATE119442T1 (en)
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CZ (1) CZ280158B6 (en)
DE (2) DE4022117A1 (en)
DK (1) DK0538265T3 (en)
ES (1) ES2069293T3 (en)
FI (1) FI95546C (en)
HU (3) HU214894B (en)
PL (1) PL168749B1 (en)
SK (1) SK283875B6 (en)
WO (1) WO1992000819A1 (en)
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DE9304946U1 (en) * 1993-04-01 1994-08-04 Intocast GmbH Feuerfestprodukte und Gießhilfsmittel, 4030 Ratingen Device for the continuous addition of powdered casting aids to the bath level of a melt in a continuous casting mold
US5622218A (en) * 1995-05-15 1997-04-22 Hylsa S.A. De C.V. Method and apparatus for continuous casting of steel materials
AT403555B (en) * 1996-04-16 1998-03-25 Voest Alpine Stahl Donawitz Method and apparatus for feeding casting powder onto the melt surface during continuous casting
ATE210520T1 (en) * 1996-05-10 2001-12-15 Sms Demag Ag CONTINUOUS CASTING PLANT FOR BILLETS
DE19650587C2 (en) * 1996-12-06 1999-01-21 Thyssen Stahl Ag Device for casting a molten metal and device for distributing mold powder
DE19748948C2 (en) * 1997-10-24 2000-10-12 Mannesmann Ag Device for adding casting powder to continuous casting plants
DE19956059C2 (en) * 1999-11-22 2002-03-14 E S C H Engineering Service Ct Process for supplying mold powder to a continuous casting mold
DE102007046261B3 (en) * 2007-09-26 2009-04-30 Mbl-Europe Gmbh Distributor for granular casting flux, comprises a connector connecting with a supply line, and pipeline sections, which guide from the connector in different directions, where each pipeline section has discharge openings and vent opening
DE102007050679A1 (en) 2007-10-21 2009-04-23 Voxeljet Technology Gmbh Method and device for conveying particulate material in the layered construction of models
DE102010056346A1 (en) 2010-12-29 2012-07-05 Technische Universität München Method for the layered construction of models
WO2013017251A1 (en) * 2011-08-02 2013-02-07 Tata Steel Nederland Technology B.V. Supply nozzle for powder or granular material

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ATE119442T1 (en) 1995-03-15
DK0538265T3 (en) 1995-05-22
AU643028B2 (en) 1993-11-04
CS213691A3 (en) 1992-02-19
DE4022117C2 (en) 1992-07-02
HU9203385D0 (en) 1993-03-01
SK283875B6 (en) 2004-04-06
PL168749B1 (en) 1996-04-30
FI930059A (en) 1993-01-08
JPH05507442A (en) 1993-10-28
EP0538265B1 (en) 1995-03-08
DE59104907D1 (en) 1995-04-13
CZ280158B6 (en) 1995-11-15
FI930059A0 (en) 1993-01-08
ZA915409B (en) 1992-04-29
ES2069293T3 (en) 1995-05-01
FI95546B (en) 1995-11-15
AU7856091A (en) 1992-02-04
HU214894B (en) 1998-07-28
US5311921A (en) 1994-05-17
HUT62219A (en) 1993-04-28
JP2609389B2 (en) 1997-05-14
FI95546C (en) 1996-02-26
PL297598A1 (en) 1992-07-13
WO1992000819A1 (en) 1992-01-23
DE4022117A1 (en) 1992-01-16

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