EP0231520B1 - Method and device for connecting a new continuously cast ingot in a continuous-casting machine - Google Patents

Method and device for connecting a new continuously cast ingot in a continuous-casting machine Download PDF

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Publication number
EP0231520B1
EP0231520B1 EP86118083A EP86118083A EP0231520B1 EP 0231520 B1 EP0231520 B1 EP 0231520B1 EP 86118083 A EP86118083 A EP 86118083A EP 86118083 A EP86118083 A EP 86118083A EP 0231520 B1 EP0231520 B1 EP 0231520B1
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EP
European Patent Office
Prior art keywords
mold
arrangement according
attachment coupling
cold
cold billet
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EP86118083A
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German (de)
French (fr)
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EP0231520B2 (en
EP0231520A1 (en
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Margrit Dr. Dislich
Johann Schruff
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Dislich Margrit Dr
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Dislich Margrit Dr
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Priority claimed from DE3629043A external-priority patent/DE3629043C2/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
    • B22D11/08—Accessories for starting the casting procedure

Definitions

  • the casting mold In continuous casting, the casting mold not only serves to form a specific cross-sectional shape of the casting strand, but because it is cooled, the molten metal solidifies in the peripheral region of the strand to form a so-called strand shell, the presence of which continues the casting strand into the downstream driving and straightening machine only made possible.
  • commissioning i.e. When casting on a continuous caster, it is not possible without auxiliary measures, as they were already mentioned at the beginning, to handle the leading end of the newly formed casting strand with its still molten core for further transport into the driving and straightening machine.
  • the new casting strand must therefore be connected to a cold strand, with the help of which it can be moved further into the driving and straightening machine.
  • connection of a new casting strand to a cold strand is referred to, then this process should relate both to the measures required when casting, i.e. starting a continuous casting installation, and to the measures when changing the batch, for example when the Plant to be transferred from one casting alloy to another.
  • This procedure has the disadvantage that the core of the beginning of the casting strand had to solidify in order to form a positive connection between the casting metal and the cold strand.
  • the cold strand supports cooling at the beginning of the casting strand, but it takes a relatively long time after opening the slide lock until the casting strand can be fed to the straightening machine. This is a considerable disadvantage when the slide closure of the intermediate container is open.
  • a sand-shaped slide filling compound is often arranged during continuous casting over the closed slide closure of the intermediate container, which is intended to prevent the molten metal from being introduced into the slide gap.
  • this slide filling compound first emerges from the outflow opening of the intermediate container and enters the casting mold.
  • this sand which has reached the end of the cold strand is whirled up and often contaminates a considerable initial section of the casting strand, which must therefore be discarded.
  • the transition from one casting alloy to another casting alloy during the operation of the continuous casting installation can be carried out continuously in that the intermediate container is charged with the new alloy before the previous filling has been completely used up. Although this does not lead to an interruption in production, it does lead to an undesired transition section in the casting line which has to be rejected and is difficult to identify for this purpose. It is therefore preferred to empty the intermediate container before loading with the new alloy. However, this leads to an interruption in the production flow. According to the known procedure, an auxiliary cold strand had to be used again, which led to considerable losses in production time.
  • the invention has for its object to propose a method and an arrangement for connecting a new casting strand in a continuous casting plant, which are primarily aimed at accelerating the tying process, but should also offer the possibility in special embodiments, on the one hand, the adverse influences possibly to minimize slider filling mass used and / or to simplify and accelerate the transition significantly when changing batches.
  • This object is achieved according to the invention in a method of the type described at the outset in that a hollow connecting sleeve which can be attached to the cold strand end and is open at the top and at least largely closed at its lower end is used as a connecting means between the cold strand and the casting strand, the wall cross-sectional shape of which is similar to the cross-sectional contour of the mold cavity and that the mold outlet is essentially closed by means of this connecting sleeve.
  • the arrangement according to the invention is characterized in a corresponding manner.
  • the thickness of the sleeve jacket should be such that the molten casting metal does not completely melt the sleeve jacket, but conversely the sleeve jacket has a cooling effect, and this is also the case by melting heat consumption during the partial melting of the connecting sleeve, which thus represents the first section of the strand shell being formed.
  • additional shot parts can be arranged in the connecting sleeve, which also preferably have the composition of the casting metal.
  • the connecting sleeve is easily attached to the end of the cold strand by inserting the cold strand itself or an extension pin connected to it through a corresponding opening in the bottom of the connecting sleeve and fixing it there with a transverse bolt which is through a transverse bore extends in the end of the cold strand or its extension pin.
  • a cross hole is the only means that must be provided for connection to the sleeve. For fastening it is sufficient if the cross bolt is so long that its protruding ends are supported on the bottom of the connecting sleeve.
  • the connecting sleeve When using this type of connection, the connecting sleeve must of course first be pushed onto the cold strand so far that the bolt can be pushed in and then pushed back until the bolt ends lie against their base. It is more appropriate to use a cross bolt, which is mounted in opposite bores of the sleeve wall. On the one hand, with such a design, the sleeve can be brought into its correct position immediately, on the other hand, the cross bolt is accessible from the outside in this way, so that it can be knocked out from the outside if the cold strand has fulfilled its task.
  • the connecting sleeve may be expedient to connect the connecting sleeve to the cold strand in such a position that its end extends into the interior thereof over a not inconsiderable region of the sleeve length.
  • the cold strand end itself also primarily contributes to the cooling of the first casting metal entering the sleeve. If, on the other hand, the cold strand end or its extension has a smaller diameter than the inside diameter of the sleeve, an annular space is hereby formed below the upper edge of the cold strand end, into which the pusher sand can first enter from the intermediate container.
  • a sand outlet opening in the annular space floor of the connecting sleeve may even consist of an annular gap which is produced in that the bottom opening of the connecting sleeve is kept somewhat larger than the cross section of the cold strand. If the annular space around the end of the cold strand is filled with shot parts to support the cooling effect, an additional sand outlet opening is hardly necessary, since the sand comes directly between the shot parts and is removed from the impact of the incoming casting metal, so that the sand is swirled into the liquid metal can no longer be done. It can be particularly expedient to additionally cover the annular space around the end of the cold strand above the inserted shot parts with a metal grid, which preferably also has the composition of the cast metal.
  • the connecting sleeve has a clear cross section which is at least the same size and design as the cross section of the mold outlet.
  • the connecting sleeve with the cold strand end stored in it and any scrap filling which may be present is placed with its upper edge surrounding the mold outlet against the underside of the mold and held in this position. This simultaneously completes the mold exit.
  • the connecting sleeve in this Embodiment has a relatively large diameter, the cold strand end does not need to be provided with an extension pin here, but can be inserted directly into the connecting sleeve through a corresponding opening in the bottom.
  • the variant of the arrangement according to the invention described here depends on the Cross-section of the auxiliary cold run used, since the sealing is achieved by the upper edge of the connecting sleeve.
  • the cold strand only has to be suitable for being able to be fed to the driving and straightening machine together with the casting strand.
  • the cross bolt is supported by the cold strand end in the wall of the connecting sleeve
  • the bottom of the connecting sleeve does not necessarily have to be fastened to it. It can in turn be attached to the cold strand.
  • a base can be provided which has a certain gap distance from the lower edge of the sleeve shell and whose diameter is larger than that of the sleeve shell, so that the base protrudes in an annular manner above it.
  • the connecting sleeve has a cross section which allows the sleeve to be inserted into the interior of the mold cavity.
  • a cross section which allows the sleeve to be inserted into the interior of the mold cavity.
  • the cold strand expediently has a cross section which roughly corresponds to the mold cavity or the casting strand, or is somewhat smaller. It is advantageous here if the cold strand end is provided with an extension pin which projects into the interior of the connecting sleeve. The extension pin can in turn be fixed in an axial bore in the cold strand end by a securing bolt.
  • the intermediate plate is used for the lower sealing of the annular space surrounding the connecting sleeve.
  • the intermediate plate is preferably designed as an insulating plate with a certain flexibility, which can consist of various suitable materials.
  • the protruding edge of the insulation board can also be used with shot parts to cool molten metal entering the gap outside the connecting sleeve.
  • the molten metal not only gets into the interior of the connecting sleeve during casting, but, as already mentioned, also into the gap between the connecting sleeve and the mold wall.
  • the melt penetrating there is cooled from two sides, namely on the one hand by the cooled mold wall and on the other hand by the wall material of the connecting sleeve.
  • This wall material further reduces the heat flow from the melt in the interior of the connecting sleeve to the cooled mold wall, so that a strand shell approach is formed particularly quickly by this arrangement, which allows the arrangement to be fed directly to the driving and straightening machine.
  • the entire arrangement of cold strand and connecting sleeve can be inserted into the continuous casting mold from the bottom, but in practice it has proven to be expedient to first pass the cold strand moving from below through the continuous casting mold until it protrudes from the inlet opening, then place the intermediate plate and the connecting sleeve on the cold strand end, connect the arrangement by means of the cross bolt and then move it back down into the interior of the mold cavity. It goes without saying that any dip tube possibly used in the continuous caster must first be removed from the mold inlet in order to bring it back into position after the connecting arrangement has been moved downwards.
  • the arrangement variant described so far is also particularly suitable for connecting the new casting strand when changing batches.
  • the casting strand must be stopped when the intermediate container becomes empty, so that its trailing end still remains in the continuous casting mold.
  • An extension pin or a prepared arrangement of a connecting sleeve, intermediate plate and extension pin with the extension pin is then inserted directly into the end of the casting strand with a still molten core.
  • the end of the strand is fixed around the extension pin, so that it is integrated into the end of the strand.
  • the arrangement according to the invention can then function as described above for restarting the system and connecting the new casting strand. In this way, a very quick batch change sel reached.
  • the trailing end of the preceding casting strand is also referred to as a cold strand in this procedure, even if it is not a cold strand used only in an auxiliary manner and does not yet have to have completely changed to the solidified state.
  • FIG. 1 The partial representation of a continuous caster in FIG. 1 shows the basic structure of a pan I, an intermediate container or tundish 2 and a continuous casting mold 3.
  • the intermediate container 2 is provided in its bottom with an outlet opening 4 with a slide closure 5 for the liquid metal.
  • a plug closure or a slide and plug closure or another closure means can also be used.
  • the plant is primarily used to produce cast steel.
  • the continuous casting mold 3 has a mold inlet 6, a mold outlet 7 and a mold cavity 8.
  • the continuous casting mold 3, shown only in the detail, is surrounded by a coolant 9 around the mold cavity 8.
  • a slide filling compound 10 essentially a certain sand mixture, is arranged which, when the slide 5 is closed, is to prevent the metal melt II located in the intermediate container 2 from entering the slide mechanism and moving it.
  • FIGS. 2 and 3 A first embodiment of an arrangement according to the invention, which can be in the position of circle A in FIG. 1, is shown in detail in FIGS. 2 and 3.
  • a connecting sleeve 14 which consists of a sleeve jacket 15 and a sleeve base 16.
  • the sleeve jacket 15 has a clear cross section which corresponds to that of the mold outlet 7, and the connecting sleeve 14 is arranged congruently with the mold outlet 7 under the mold 3.
  • the socket bottom 16 has a bottom opening 17 through which the cold strand 12 is inserted with its end 18 from below into the interior of the connecting sleeve 14.
  • a transverse bolt 20 is arranged in a transverse bore 19 of the cold strand end 18, the projecting ends of which abut against the socket bottom 16 and through which the cold strand end 18 is prevented from leaving the connecting sleeve 14.
  • the bottom opening 17 in the socket bottom 16 has a somewhat larger cross section than the cold strand end 18, so that an annular gap 21 remains, which, as will be described further below, serves as a sand outlet opening.
  • the sleeve jacket 15 can be provided with fasteners that allow the fixed and sealing positioning of the connecting sleeve 14 below the continuous casting mold 3. Suitable fasteners are available in the prior art. Only grooves 22 are indicated in the sleeve jacket 15, into which fastening hooks or clips (not shown) can engage. Some shot parts 23 are arranged inside the connecting sleeve 14.
  • the free-flowing slide filling compound 10 first reaches the connecting sleeve 14, and within it between the shot parts 23 to the bottom of the connecting sleeve 14, from where at least the essential part of the sand can exit through the sand outlet opening 21 from the connecting sleeve downwards.
  • the amount of sand remaining within the connecting sleeve and largely covered by the shot parts 23 is so small that it is not directly reached by the subsequent molten metal when it hits the connecting sleeve, which prevents contamination of the metal by the filler sand.
  • the tight contact of the connecting sleeve 14 on the underside 13 of the casting mold 3 prevents the metal melt from escaping from the mold and the connecting sleeve.
  • the first molten metal entering the connecting sleeve 14 is cooled by the sleeve wall 15 and the shot parts 23 and the cold strand end 18 itself, the melting of which consumes heat of fusion, so that a strand shell is formed parallel to the sleeve shell, including this, which forms a non-positive connection leads between the sleeve and the casting strand, so that only a short time later the cold strand 12 with the connecting sleeve 14 and the casting strand connected to the direction machine can be fed, whereby the continuous casting process is started.
  • the casting mold 3 has a circular cross section in the exemplary embodiment.
  • the mold can have a wide variety of cross-sectional configurations, depending on the product to be manufactured, and that the arrangement according to the invention can be adapted to each of these cross-sectional configurations by the sleeve jacket 15 having a corresponding cross-section, or else a cross section that is slightly larger than the cross section of the mold outlet.
  • the cold strand used alternatively for the arrangement shown has a substantially smaller cross section than the casting strand, which in the example is even rectangular. However, this is not essential. The only requirement is that the auxiliary cold strand used can be fed to the straightening machine.
  • FIGS. 4 and 5 differs from that according to FIGS. 2 and 3 in some features which are to be described below, for the rest parts which correspond to those of FIGS. 2 and 3 are the same Reference numerals.
  • the cold strand end 18 projects further into the connecting sleeve 14 than in the arrangement according to FIG. 2.
  • the cold strand end 18 is held by an elongated transverse bolt 24, the ends of which extend a little above the socket bottom in opposite bores 25 is mounted in the sleeve jacket 15. Due to the deeper insertion of the cold strand end 18, a deepened annular space 26 is created around it below the upper edge of the cold strand end 18 in the connecting sleeve 14. This annular space is partially filled with shot parts 23 and covered with a metal grid 26 above the shot parts.
  • the slide filling compound 10 emerging from the intermediate container when the continuous casting installation is poured on passes through the metal grid 26 between the shot parts 23 in the annular space 26 and is thus removed from the direct impact by the subsequent metal melt.
  • a sand outlet opening is not absolutely necessary in this embodiment, but can also be provided. Shot parts and metal grids, which preferably have the same composition as the cast metal, contribute to cooling the molten metal in the lower region of the connecting sleeve. Otherwise, the connection process of the new casting strand takes place as already described in connection with FIGS. 2 and 3.
  • the sleeve base 16 may be expedient to arrange the sleeve base 16 at a certain gap distance from the sleeve jacket 15. Small amounts of molten metal that may escape through this gap are stopped by the asbestos cord ring 27 resting on the socket base 16.
  • the sleeve base is larger than the outer cross section of the sleeve jacket. In addition, it is square, in contrast to the sleeve jacket. This shape can be useful for manufacturing reasons.
  • FIGS. 6 and 7 Another embodiment of the arrangement according to the invention is shown in FIGS. 6 and 7.
  • the connecting sleeve 14 used here consists solely of the sleeve casing 15, which has a somewhat smaller cross section than the mold cavity 8, so that the connecting sleeve 14 can be inserted into the interior of the mold cavity 8 while leaving a gap 28 between the sleeve casing 15 and the mold inner wall.
  • 6 shows the connecting sleeve 14 arranged in the interior of the mold cavity 8.
  • an extension pin 29 is provided for connecting the end of the cold strand 12 to the connecting sleeve 14, which has its lower end in an axial recess 30 in the end of the Cold strand 12 rests and is anchored there by means of a securing bolt 31 which extends through aligned bores 32 in the extension pin and in the cold strand.
  • the extension pin 29 is fastened within the connecting sleeve 14, as described for the cold strand end 18 in connection with FIG. 4.
  • an intermediate plate 33 made of an insulating material is arranged between the cold strand end 18 and the connecting sleeve 14, which protrudes like a collar over the outer circumference of the connecting sleeve 14 and extends as far as the inner mold wall extends.
  • the collar-like protrusion of this intermediate plate is also covered with shot parts for cooling the melt reaching there.
  • melt penetrating into the gap 28 is preferably cooled by the cooled mold wall as well as by the sleeve wall 15, where it solidifies and possibly melts in part with the sleeve wall 15, thereby forming the beginning of a strand shell which forms a non-positive connection with the connecting sleeve 14 comes in.
  • the shot parts 34 on the intermediate plate 33 outside the connecting sleeve 14 contribute to the solidification of the melt in the lower region of the gap space 28, whereby the melt is prevented from destroying the intermediate plate and from premature escape from the mold cavity.
  • the arrangement of cold strand and connecting sleeve with the connected new casting strand can be fed to the driving and straightening machine.
  • the arrangement shown in FIG. 6 is advantageously positioned by first moving the cold strand end 18 through the mold 3 from below, above the mold under 1 push the cross bolt with the sleeve arrangement and then the sleeve assembly is moved down into the interior of the mold. Since the connecting sleeve and the cold strand end are connected to one another in a non-displaceable manner, the arrangement can be held in the illustrated position by holding the cold strand 12 as long as required.
  • the arrangement described last can advantageously also be used for the rapid processing of a batch change, for example by inserting the extension pin 29 into the still molten core of the ending casting strand, whereupon after it is anchored by cooling the casting strand end from the completed casting process, the arrangement, as described above, can be provided for connecting the new casting strand.

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  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
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Description

Die Erfindung betrifft ein Verfahren zum Anbinden eines neuen Gießstranges

  • in einer Stranggießanlage mit einem Zwischenbehälter (Tundish) für das flüssige Gießmetall, der in seinem Boden mit durch Verschlußmittel verschließbarer Ausflußöffnung versehen ist, und mit einer unterhalb der Ausflußöffnung angeordneten, gekühlten Stranggießkokille mit Kokilleneintritt, Kokillenhohlraum und unterem Kokillenaustritt, sowie gegebenenfalls mit einem zwischen Ausflußöffnung und Kokille angeordneten, in den Kokillenhohlraum hineinragenden Tauchrohr,
  • bei welchem (Verfahren) der Kokillenaustritt zumindest weitgehend vorübergehend verschlossen und nach Öffnen des Schieberverschlusses durch Erstarren des zuerst aus der Ausflußöffnung ausgetretenen Gießmetalles eine Verbindung mit dem mit Verbindungsmitteln versehenen Ende eines Kaltstranges hergestellt wird, worauf der Kaltstrang mit dem angebundenen Gießstrang abgezogen wird. Die Erfindung betrifft auch eine entsprechende Anordnung zum Durchführen eines solchen Verfahrens.
The invention relates to a method for connecting a new casting strand
  • in a continuous caster with an intermediate container (tundish) for the liquid casting metal, which is provided in its bottom with an outlet opening which can be closed by a closure means, and with a cooled continuous casting mold with mold inlet, mold cavity and lower mold outlet arranged underneath the outlet opening, and optionally with one between the outlet opening and mold arranged dip tube protruding into the mold cavity,
  • in which (process) the mold outlet is at least largely temporarily closed and after opening the slide closure by solidifying the casting metal that first emerged from the outflow opening, a connection is made to the end of a cold strand provided with connecting means, whereupon the cold strand is pulled off with the tied casting strand. The invention also relates to a corresponding arrangement for performing such a method.

Beim Stranggießen dient die Gießkokille nicht nur der Ausbildung einer bestimmten Querschnittsgestalt des Gießstranges, sondern dadurch, daß sie gekühlt wird, erstarrt das schmelzflüssige Metall im Umfangsbereich des Stranges zu einer sog. Strangschale, deren Vorhandensein das Weiterführen des Gießstranges in die nachgeordnete Treib- und Richtmaschine erst ermöglicht. Beim Inbetriebnehmen, d.h. beim Angießen einer Stranggießanlage, ist es ohne Hilfsmaßnahmen, wie sie ihrer Art nach eingangs bereits erwähnt wurden, nicht möglich, das Vorlaufende des neu gebildeten Gießstranges mit seinem noch schmelzflüssigen Kern für einen Weitertransport in die Treib- und Richtmaschine zu handhaben. Der neue Gießstrang muß daher an einen Kaltstrang angebunden werden, mit dessen Hilfe er in die Treib- und Richtmaschine weiterbewegt werden kann.In continuous casting, the casting mold not only serves to form a specific cross-sectional shape of the casting strand, but because it is cooled, the molten metal solidifies in the peripheral region of the strand to form a so-called strand shell, the presence of which continues the casting strand into the downstream driving and straightening machine only made possible. When commissioning, i.e. When casting on a continuous caster, it is not possible without auxiliary measures, as they were already mentioned at the beginning, to handle the leading end of the newly formed casting strand with its still molten core for further transport into the driving and straightening machine. The new casting strand must therefore be connected to a cold strand, with the help of which it can be moved further into the driving and straightening machine.

Wenn im Sinne der vorliegenden Erfindung vom Anbinden eines neuen Gießstranges an einen Kaltstrang gesprochen wird, so soll sich dieser Vorgang sowohl auf die erforderlichen Maßnahmen beim Angießen, also Starten einer Stranggießanlage beziehen, wie auch auf die Maßnahmen beim Chargenwechsel, wenn beispielsweise während des Betriebes der Anlage von einer Gießlegierung auf eine andere übergegangen werden soll.If, within the meaning of the present invention, the connection of a new casting strand to a cold strand is referred to, then this process should relate both to the measures required when casting, i.e. starting a continuous casting installation, and to the measures when changing the batch, for example when the Plant to be transferred from one casting alloy to another.

Die aus der Praxis bekannte Vorgehensweise (FR-A 2 550 480) beim Starten einer horizontalen Stranggießanlage bestand darin, eine bereits erstarrte Restlänge (beispielsweise von einem früheren Gießvorgang) von gleicher Querschnittsgestalt wie der zu gießende Strang und möglichst gleicher Zusammensetzung, einen sog. Kaltstrang, an seinem einen Ende mit einem Verbindungsmittel, beispielsweise einem pilzartigen Fortsatz, zu versehen, und dieses Ende des Kaltstranges als nachlaufendes Ende von unten in die Gießkokille einzuführen, und in dieser Stellung zu halten. Durch das Einführen des Kaltstranges in die Gießkokille wurde deren Austritt gleichzeitig verschlossen. Dann ließ man das nach Öffnen des Schiebeverschlusses zuerst in die Gießkokille gelangende Metall soweit erstarren, bis sich eine formschlüssige Verbindung zwischen dem ersten Gießmetall und den Verbindungsmitteln des Kaltstranges gebildet hatte, um den so angebundenen Gießstrang mittels des Kaltstranges der Treib- und Richtmaschine zuzuführen.The procedure known from practice (FR-A 2 550 480) when starting a horizontal continuous casting plant consisted of an already solidified remaining length (for example from an earlier casting process) of the same cross-sectional shape as the strand to be cast and the same possible composition, a so-called cold strand , to provide at one end with a connecting means, for example a mushroom-like extension, and to insert this end of the cold strand as a trailing end from below into the casting mold and to hold it in this position. By inserting the cold strand into the casting mold, its outlet was closed at the same time. Then the metal that first came into the casting mold after opening the slide closure was allowed to solidify until a positive connection had formed between the first casting metal and the connecting means of the cold strand in order to feed the casting strand connected in this way to the driving and straightening machine by means of the cold strand.

Diese Vorgehensweise hat den Nachteil, daß zum Ausbilden einer formschlüssigen Verbindung zwischen dem Gießmetall und dem Kaltstrang der Kern des Gießstranganfanges erstarren mußte. Zwar unterstützt der Kaltstrang das Abkühlen am Gießstranganfang, es ist jedoch eine verhältnismäßig lange Zeit nach Öffnen des Schieberverschlusses erforderlich, bis der Gießstrang der Richtmaschine zugeführt werden kann. Dies ist bei geöffnetem Schieberverschluß des Zwischenbehälters von erheblichem Nachteil.This procedure has the disadvantage that the core of the beginning of the casting strand had to solidify in order to form a positive connection between the casting metal and the cold strand. The cold strand supports cooling at the beginning of the casting strand, but it takes a relatively long time after opening the slide lock until the casting strand can be fed to the straightening machine. This is a considerable disadvantage when the slide closure of the intermediate container is open.

Häufig wird beim Stranggießen über dem geschlossenen Schieberverschluß des Zwischenbehälters eine sandförmige Schieberfüllmasse angeordnet, die das Einbringen des geschmolzenen Metalles in den Schieberspalt verhindern soll. Beim Angießen der Anlage und Öffnen des Schieberverschlusses tritt somit zuerst diese Schieberfültmasse aus der Ausflußöffnung des Zwischenbehälters aus und gelangt in die Gießkokille. Durch Aufprall und Turbulenz der unmittelbar nachfolgenden Metallschmelze wird dieser auf das Kaltstrangende gelangte Sand aufgewirbelt und verunreinigt nicht selten einen beträchtlichen Anfangsabschnitt des Gießstranges, der somit verworfen werden muß. Bei der bisherigen Vorgehensweise zum Anbinden eines Gießstranges ist es nicht möglich, den Sand aus dem Anbindebereich des Gießstranges zu beseitigen.A sand-shaped slide filling compound is often arranged during continuous casting over the closed slide closure of the intermediate container, which is intended to prevent the molten metal from being introduced into the slide gap. When the system is poured on and the slide closure is opened, this slide filling compound first emerges from the outflow opening of the intermediate container and enters the casting mold. As a result of the impact and turbulence of the immediately following molten metal, this sand which has reached the end of the cold strand is whirled up and often contaminates a considerable initial section of the casting strand, which must therefore be discarded. With the previous procedure for connecting a casting strand, it is not possible to remove the sand from the tying area of the casting strand.

Der Übergang von einer Gießlegierung zu einer anderen Gießlegierung während des Betriebes der Stranggießanlage kann kontinuierlich vorgenommen werden, indem der Zwischenbehälter vor vollständigem Verbrauch der vorhergehenden Füllung mit der neuen Legierung beschickt wird. Dies führt zwar nicht zu einer Produktionsunterbrechung, aber zu einem unerwünschten Übergangsabschnitt im Gießstrang, der verworfen werden muß und zu diesem Zweck nur schwer identifizierbar ist. Es wird daher bevorzugt, den Zwischenbehälter vor Beschicken mit der neuen Legierung leerzuarbeiten. Dies führt jedoch zu einer Unterbrechung im Produktionsfluß. Nach bekannter Vorgehensweise mußte hier wieder mit einem Hilfs-Kaltstrang gearbeitet werden, was zu erheblichen Verlusten an Produktionszeit führte.The transition from one casting alloy to another casting alloy during the operation of the continuous casting installation can be carried out continuously in that the intermediate container is charged with the new alloy before the previous filling has been completely used up. Although this does not lead to an interruption in production, it does lead to an undesired transition section in the casting line which has to be rejected and is difficult to identify for this purpose. It is therefore preferred to empty the intermediate container before loading with the new alloy. However, this leads to an interruption in the production flow. According to the known procedure, an auxiliary cold strand had to be used again, which led to considerable losses in production time.

Aus der den Oberbegriff der unabhängigen Ansprüche 1 oder 2 bildenden Literaturstelle "Handbook on Continuous Casting", 1980, Seite 471, Fig. 3028 (= SU 456 676) ist schließlich eine vertikale Anordnung bekannt, bei der der erstarrte Strangteil über eine Hinterschneidung eines Zwischenstückes die zum Ausziehen des Stranges notwendige formschlüssige Verbindung bildet. Diese Anordnung entspricht somit im wesentlichen dem zuvor bereits genannten Stand der Technik, so daß bezüglich der damit einhergehenden technischen Probleme auf die voranstehenden Darlegungen verwiesen werden kann.Finally, a vertical arrangement is known from the reference "Handbook on Continuous Casting", 1980, page 471, Fig. 3028 (= SU 456 676) forming the preamble of independent claims 1 or 2, in which the solidified strand part has an undercut of an intermediate piece forms the positive connection necessary for pulling out the strand. This arrangement thus corresponds essentially to the aforementioned state of the art, so that reference can be made to the above explanations with regard to the technical problems associated therewith.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Anordnung zum Anbinden eines neuen Gießstranges in einer Stranggießanlage vorzuschlagen, die in erster Linie darauf gerichtet sind, den Anbindevorgang zu beschleunigen, in speziellen Ausführungsformen aber auch die Möglichkeit bieten sollen, einerseits die nachteiligen Einflüsse eventuell verwendeter Schieberfüllmasse zu minimieren und/oder den Übergang beim Chargenwechsel wesentlich zu vereinfachen und zu beschleunigen.The invention has for its object to propose a method and an arrangement for connecting a new casting strand in a continuous casting plant, which are primarily aimed at accelerating the tying process, but should also offer the possibility in special embodiments, on the one hand, the adverse influences possibly to minimize slider filling mass used and / or to simplify and accelerate the transition significantly when changing batches.

Diese Aufgabe wird bei einem Verfahren der eingangs bezeichneten Art erfindungsgemäß dadurch geklöst, daß als Verbindungsmittel zwischen dem Kaltstrang und dem Gießstrang eine am Kaltstrangende befestigbare, oben offene und an ihrem unteren Ende zumindest weitgehend verschlossene hohle Verbindungsmuffe verwendet wird, deren Wandquerschnittsgestalt der Querschnittskontur des Kokillenhohlraumes ähnlich ist, und das der Kokillenaustritt mittels dieser Verbindungsmuffe im wesentlichen verschlossen wird. Die erfindungsgemäße Anordnung ist in entsprechender Weise gekennzeichnet.This object is achieved according to the invention in a method of the type described at the outset in that a hollow connecting sleeve which can be attached to the cold strand end and is open at the top and at least largely closed at its lower end is used as a connecting means between the cold strand and the casting strand, the wall cross-sectional shape of which is similar to the cross-sectional contour of the mold cavity and that the mold outlet is essentially closed by means of this connecting sleeve. The arrangement according to the invention is characterized in a corresponding manner.

Es hat sich überraschenderweise gezeigt, daß es nicht erforderlich ist, am Kaltstrangende zum Teil mit erheblichem Aufwand zentrale Verbindungsmittel mit Hinterschneidungsflächen vorzusehen, die eine formschlüssige Verbindung mit dem Gießmetall nach dessen Erstarren eingehen, sondern daß es vorteilhafter ist, Verbindungsmittel vorzugeben, die aus einem schalen- oder hülsenartigen Umfangsmuffenteil bestehen, der quasi einen vorbereiteten Ansatz für das Ausbilden der den Gießstrang stabilisierenden Strangschale darstellt. Nach kürzester Zeit entsteht so eine kraftschlüssige Verbindung, die das Abziehen des neuen Gießstranges gestattet. Der Mantel der Verbindungsmuffe soll dabei vorzugsweise von gleicher Zusammensetzung sein wie das Gießmetall selbst. Die Dicke des Muffenmantels ist dabei so zu bemessen, daß durch das schmelzflüssige Gießmetall kein vollständiges Aufschmelzen des Muffenmantels erfolgt, sondern umgekehrt vom Muffenmantel eine Kühlwirkung ausgeht, und sei dies auch durch Schmelzwärmeverbrauch beim teilweisen Anschmelzen der Verbindungsmuffe, die somit den ersten Abschnitt der sich ausbildenden Strangschale darstellt. Zur Erhöhung des Schmelzwärmeverbrauches können zusätzlich Schrotteile in der Verbindungsmuffe angeordnet werden, die ebenfalls vorzugsweise die Zusammensetzung des Gießmetalles haben. Die erfindungsgemäße Vorgehensweise arbeitet funktionssicher und erlaubt das Starten einer Stranggießanlage in einer Zeitspanne von 10 Sekunden und weniger.Surprisingly, it has been shown that it is not necessary to provide central connecting means with undercut surfaces at the end of the cold strand, some of which require considerable effort, which form a positive connection with the casting metal after it has solidified, but that it is more advantageous to specify connecting means which form a shell - Or sleeve-like circumferential sleeve part, which virtually represents a prepared approach for the formation of the strand shell stabilizing the casting strand. In a very short time, this creates a non-positive connection that allows the new cast strand to be pulled off. The jacket of the connecting sleeve should preferably have the same composition as the casting metal itself. The thickness of the sleeve jacket should be such that the molten casting metal does not completely melt the sleeve jacket, but conversely the sleeve jacket has a cooling effect, and this is also the case by melting heat consumption during the partial melting of the connecting sleeve, which thus represents the first section of the strand shell being formed. In order to increase the melting heat consumption, additional shot parts can be arranged in the connecting sleeve, which also preferably have the composition of the casting metal. The procedure according to the invention functions reliably and allows a continuous caster to be started in a time span of 10 seconds and less.

Bei bevorzugter Ausführungsform der erfindungsgemäßen Anordnung wird die Verbindungsmuffe dadurch problemlos am Kaltstrangende befestigt, daß der Kaltstrang selbst oder ein mit ihm verbundener Verlängerungszapfen durch eine entsprechende Öffnung im Boden der Verbindungsmuffe in deren Inneres hineingeführt und dort mit einem Querbolzen festgesetzt wird, der sich durch eine Querbohrung im Ende des Kaltstranges oder dessen Verlängerungszapfen erstreckt. Eine solche Querbohrung ist das einzige Mittel, welches zur Verbindung mit der Muffe vorgesehen werden muß. Zur Befestigung reicht es aus, wenn der Querbolzen so lang ist, daß sich seine überstehenden Enden am Boden der Verbindungsmuffe abstützen. Bei Verwendung dieser Verbindungsart muß die Verbindungsmuffe natürlich zuerst soweit auf den Kaltstrang aufschiebbar sein, daß der Bolzen einschiebbar ist, um sie dann soweit zurückzuschieben, bis die Bolzenenden gegen ihren Boden anliegen. Zweckmäßiger ist es, einen Querbolzen zu verwenden, der in gegenüberliegenden Bohrungen der Muffenwand gelagert ist. Einmal kann bei einer solchen Ausführung die Muffe unmittelbar in ihre richtige Position gebracht werden, andererseits ist der Querbolzen auf diese Weise von außen zugänglich, so daß er, wenn der Kaltstrang seine Aufgabe erfüllt hat, eventuell von außen wieder herausgeschlagen werden kann.In a preferred embodiment of the arrangement according to the invention, the connecting sleeve is easily attached to the end of the cold strand by inserting the cold strand itself or an extension pin connected to it through a corresponding opening in the bottom of the connecting sleeve and fixing it there with a transverse bolt which is through a transverse bore extends in the end of the cold strand or its extension pin. Such a cross hole is the only means that must be provided for connection to the sleeve. For fastening it is sufficient if the cross bolt is so long that its protruding ends are supported on the bottom of the connecting sleeve. When using this type of connection, the connecting sleeve must of course first be pushed onto the cold strand so far that the bolt can be pushed in and then pushed back until the bolt ends lie against their base. It is more appropriate to use a cross bolt, which is mounted in opposite bores of the sleeve wall. On the one hand, with such a design, the sleeve can be brought into its correct position immediately, on the other hand, the cross bolt is accessible from the outside in this way, so that it can be knocked out from the outside if the cold strand has fulfilled its task.

Es kann zweckmäßig sein, die Verbindungsmuffe in einer solchen Position mit dem Kaltstrang zu verbinden, daß sich sein Ende über einen nicht unerheblichen Bereich der Muffenlänge in deren Inneres hineinerstreckt. In erster Linie trägt bei einer solchen Anordnung das Kaltstrangende selbst auch zur Kühlung des ersten, in die Muffe eintretenden Gießmetalles bei. Weist andererseits das Kaltstrangende oder dessen Fortsatz einen geringeren Durchmesser auf als der Innendurchmesser der Muffe, so wird hierdurch unterhalb der Oberkante des Kaltstrangendes ein Ringraum gebildet, in den zuerst der Schiebersand aus dem Zwischenbehälter eintreten kann. Es kann zweckmäßig sein, zum Entfernen dieses Sandes sogar zusätzlich eine Sandaustrittsöffnung im Ringraumboden der Verbindungsmuffe vorzusehen, die eventuell sogar aus einem Ringspalt besteht, der dadurch erzeugt wird, daß die Bodenöffnung der Verbindungsmuffe etwas größer gehalten wird als der Querschnitt des Kaltstranges. Wird der Ringraum um das Kaltstrangende herum jedoch zur Unterstützung der Kühlwirkung mit Schrotteilen gefüllt, ist eine zusätzliche Sandaustrittsöffnung kaum erforderlich, da der Sand unmittelbar zwischen die Schrotteile gelangt und dem Aufprall des eintretenden Gießmetalls entzogen wird, so daß eine Verwirbelung des Sandes in das flüssige Metall nicht mehr erfolgen kann. Besonders zweckmäßig kann es sein, den Ringraum um das Kaltstrangende oberhalb der eingelegten Schrotteile zusätzlich mit einem Metallgitter abzudecken, welches vorzugsweise ebenfalls die Zusammensetzung des Gießmetalles aufweist.It may be expedient to connect the connecting sleeve to the cold strand in such a position that its end extends into the interior thereof over a not inconsiderable region of the sleeve length. In such an arrangement, the cold strand end itself also primarily contributes to the cooling of the first casting metal entering the sleeve. If, on the other hand, the cold strand end or its extension has a smaller diameter than the inside diameter of the sleeve, an annular space is hereby formed below the upper edge of the cold strand end, into which the pusher sand can first enter from the intermediate container. It may be expedient to additionally provide a sand outlet opening in the annular space floor of the connecting sleeve to remove this sand, which may even consist of an annular gap which is produced in that the bottom opening of the connecting sleeve is kept somewhat larger than the cross section of the cold strand. If the annular space around the end of the cold strand is filled with shot parts to support the cooling effect, an additional sand outlet opening is hardly necessary, since the sand comes directly between the shot parts and is removed from the impact of the incoming casting metal, so that the sand is swirled into the liquid metal can no longer be done. It can be particularly expedient to additionally cover the annular space around the end of the cold strand above the inserted shot parts with a metal grid, which preferably also has the composition of the cast metal.

Bei einer ersten grundsätzlichen Variante der erfindungsgemäßen Anordnung weist die Verbindungsmuffe einen lichten Querschnitt auf, der zumindest gleichgroß und gleichgestaltet ist wie der Querschnitt des Kokillenaustritts. Bei dieser Variante wird die Verbindungsmuffe mit dem in ihr gelagerten Kaltstrangende und der gegebenenfalls vorhandenen Schrottfüllung mit ihrer Oberkante den Kokillenaustritt umgebend gegen die Unterseite der Kokille angelegt und in dieser Stellung gehalten. Hierdurch wird gleichzeitig der Kokillenaustritt abgeschlossen. Da die Verbindungsmuffe bei dieser Ausführungsform einen verhältnismäßig großen Durchmesser aufweist, braucht das Kaltstrangende hier nicht mit einem Verlängerungszapfen versehen zu werden, sondern kann unmittelbar durch eine entsprechende Öffnung im Boden der Verbindungsmuffe in diese hineingeführt sein.In a first basic variant of the arrangement according to the invention, the connecting sleeve has a clear cross section which is at least the same size and design as the cross section of the mold outlet. In this variant, the connecting sleeve with the cold strand end stored in it and any scrap filling which may be present is placed with its upper edge surrounding the mold outlet against the underside of the mold and held in this position. This simultaneously completes the mold exit. Because the connecting sleeve in this Embodiment has a relatively large diameter, the cold strand end does not need to be provided with an extension pin here, but can be inserted directly into the connecting sleeve through a corresponding opening in the bottom.

Während es bei der bekannten Vorgehensweise erforderlich war, einen Kaltstrang zu verwenden, dessen Querschnitt im wesentlichen dem Querschnitt des Kokillenhohlraumes entsprach, und selbst bei Beachtung dieser Vorschrift der Kokillenaustritt nur unvollkommen verschlossen werden konnte, kommt es bei der hier beschriebenen Variante der erfindungsgemäßen Anordnung auf den Querschnitt des verwendeten Hilfs-Kaltstranges nicht an, da die Abdichtung durch die Oberkante der Verbindungsmuffe erzielt wird. Der Kaltstrang muß lediglich geeignet sein, zusammen mit dem Gießstrang der Treib- und Richtmaschine zugeführt werden zu können.While it was necessary in the known procedure to use a cold strand, the cross section of which essentially corresponded to the cross section of the mold cavity, and even if this regulation was observed, the mold outlet could only be imperfectly sealed, the variant of the arrangement according to the invention described here depends on the Cross-section of the auxiliary cold run used, since the sealing is achieved by the upper edge of the connecting sleeve. The cold strand only has to be suitable for being able to be fed to the driving and straightening machine together with the casting strand.

Insofern bei dieser Ausführungsform der Querbolzen durch das Kaltstrangende in der Wand der Verbindungsmuffe gelagert ist, braucht der Boden der Verbindungsmuffe nicht notwendigerweise an dieser befestigt zu sein. Er kann seinerseits am Kaltstrang befestigt sein. Zur besseren Einbindung des Gießmetalls kann beispielsweise ein Boden vorgesehen werden, der einen gewissen Spaltabstand von der Unterkante des Muffenmantels aufweist und dessen Durchmesser größer ist als derjenige des Muffenmantels, so daß der Boden ringförmig über diesen vorsteht. Um hierhergelangende Metallschmelze zu kühlen, ist es bei einer solchen Anordnung vorteilhaft, auch auf dem ringförmigen Bodenüberstand Schrotteile anzuordnen, oder sogar eine den Schmelzfluß begrenzende Asbestschnur.Insofar as in this embodiment the cross bolt is supported by the cold strand end in the wall of the connecting sleeve, the bottom of the connecting sleeve does not necessarily have to be fastened to it. It can in turn be attached to the cold strand. For better integration of the cast metal, for example, a base can be provided which has a certain gap distance from the lower edge of the sleeve shell and whose diameter is larger than that of the sleeve shell, so that the base protrudes in an annular manner above it. In order to cool the molten metal coming here, it is advantageous with such an arrangement to also arrange shot parts on the annular base projection, or even an asbestos cord that limits the melt flow.

Bei einer zweiten grundsätzlichen Variante der erfindungsgemäßen Anordnung weist die Verbindungsmuffe einen Querschnitt auf, der es gestattet, daß die Muffe in das Innere des Kokillenhohlraumes eingeschoben wird. Bevorzugt wird hierbei eine solche Ausführung gewählt, bei der zwischen Außenfläche der Muffenwand und der Innenfläche des Kokillenhohlraumes ein gewisser Spaltabstand verbleibt. Der Kaltstrang weist bei dieser Ausführungsform zweckmäßigerweise einen Querschnitt auf, der in etwa dem Kokillenhohlraum bzw. dem Gießstrang entspricht, oder etwas geringer ist. Hierbei ist es vorteilhaft, wenn das Kaltstrangende mit einem Verlängerungszapfen versehen ist, der in das Innere der Verbindungsmuffe hineinragt. Der Verlängerungszapfen kann in einer axialen Bohrung im Kaltstrangende seinerseits durch einen Sicherungsbolzen festgelegt sein. Bei entsprechendem Querschnitt des Kaltstranges braucht hier kein getrennter Muffenboden vorgesehen zu werden, da die den Verlängerungszapfen umgebende Stirnfläche des Kaltstrangendes als solcher dienen kann, füllt jedoch auch der Kaltstrang den Kokillenquerschnitt nicht vollständig aus, kann es erforderlich sein, zwischen Kaltstrangende und Verbindungsmuffe eine Zwischenplatte anzuordnen, die bis zur Anlage gegen die Innenwand des Kokillenhohlraumes kragenartig über den Muffenumfang vorsteht. Diese Zwischenplatte dient der unteren Abdichtung des die Verbindungsmuffe umgebenden Ringraumes. Um die Anordnung mit einer solchen Zwischenplatte problemlos in den Kokillenhohlraum einführen zu können, ist die Zwischenplatte vorzugsweise als eine eine gewisse Nachgiebigkeit aufweisende Dämmplatte ausgebildet, die aus verschiedenen geeigneten Materialien bestehen kann. Der überstehende Rand der Dämmplatte kann zum Kühlen von in den Spaltraum außerhalb der Verbindungsmuffe gelangender Metallschmelze zusätzlich mit Schrotteilen belegt sein.In a second basic variant of the arrangement according to the invention, the connecting sleeve has a cross section which allows the sleeve to be inserted into the interior of the mold cavity. Such a design is preferably selected in which a certain gap distance remains between the outer surface of the sleeve wall and the inner surface of the mold cavity. In this embodiment, the cold strand expediently has a cross section which roughly corresponds to the mold cavity or the casting strand, or is somewhat smaller. It is advantageous here if the cold strand end is provided with an extension pin which projects into the interior of the connecting sleeve. The extension pin can in turn be fixed in an axial bore in the cold strand end by a securing bolt. With a corresponding cross-section of the cold strand, a separate socket bottom need not be provided here, since the end face of the cold-strand end surrounding the extension pin can serve as such, but even if the cold strand does not completely fill the mold cross-section, it may be necessary to arrange an intermediate plate between the cold-strand end and the connecting sleeve , which protrudes like a collar over the circumference of the sleeve until it lies against the inner wall of the mold cavity. This intermediate plate is used for the lower sealing of the annular space surrounding the connecting sleeve. In order to be able to insert the arrangement with such an intermediate plate into the mold cavity without problems, the intermediate plate is preferably designed as an insulating plate with a certain flexibility, which can consist of various suitable materials. The protruding edge of the insulation board can also be used with shot parts to cool molten metal entering the gap outside the connecting sleeve.

Bei dieser Ausführungsform der erfindungsgemäßen Anordnung zum Anbinden des neuen Gießstranges gelangt das schmelzflüssige Metall beim Angießen nicht nur in den Innenraum der Verbindungsmuffe, sondern, wie bereits erwähnt, auch in den Spaltraum zwischen der Verbindungsmuffe und der Kokillenwand. Die dort eindringende Schmelze wird von zwei Seiten gekühlt, nämlich einerseits durch die gekühlte Kokillenwand und andererseits durch das Wandmaterial der Verbindungsmuffe. Dieses Wandmaterial vermindert weiterhin den Wärmefluß aus der Schmelze im Inneren der Verbindungsmuffe zur gekühlten Kokillenwand hin, so daß durch diese Anordnung besonders schnell ein Strangschalenansatz gebildet wird, der ein unmittelbares Zuführen der Anordnung zur Treib- und Richtmaschine gestattet.In this embodiment of the arrangement according to the invention for connecting the new casting strand, the molten metal not only gets into the interior of the connecting sleeve during casting, but, as already mentioned, also into the gap between the connecting sleeve and the mold wall. The melt penetrating there is cooled from two sides, namely on the one hand by the cooled mold wall and on the other hand by the wall material of the connecting sleeve. This wall material further reduces the heat flow from the melt in the interior of the connecting sleeve to the cooled mold wall, so that a strand shell approach is formed particularly quickly by this arrangement, which allows the arrangement to be fed directly to the driving and straightening machine.

Die gesamte Anordnung aus Kaltstrang und Verbindungsmuffe kann zwar fertig zusammengesetzt von unten in die Stranggießkokille eingeführt werden, in der Praxis hat es sich jedoch als zweckmäßig erwiesen, den von unten heranbewegten Kaltstrang zuerst durch die Stranggießkokille soweit hindurchzuführen, daß er aus der Eintrittsöffnung herausragt, dann die Zwischenplatte und die Verbindungsmuffe auf das Kaltstrangende aufzusetzen, die Anordnung durch den Querbolzen zu verbinden und dann nach unten in das Innere des Kokillenhohlraumes zurückzubewegen. Es ist selbstverständlich, daß ein eventuell in der Stranggießanlage verwendetes Tauchrohr zuvor aus dem Kokilleneintritt entfernt werden muß, um es nach Abwärtsbewegen der Verbindungsanordnung wieder in Position zu bringen.The entire arrangement of cold strand and connecting sleeve can be inserted into the continuous casting mold from the bottom, but in practice it has proven to be expedient to first pass the cold strand moving from below through the continuous casting mold until it protrudes from the inlet opening, then place the intermediate plate and the connecting sleeve on the cold strand end, connect the arrangement by means of the cross bolt and then move it back down into the interior of the mold cavity. It goes without saying that any dip tube possibly used in the continuous caster must first be removed from the mold inlet in order to bring it back into position after the connecting arrangement has been moved downwards.

Die insoweit beschriebene Anordnungsvariante eignet sich in besonderem Maße auch für das Anbinden des neuen Gießstranges bei einem Chargenwechsel. Hierfür muß bei Leerwerden des Zwischenbehälters der Gießstrang angehalten werden, so daß sein nachlaufendes Ende noch in der Stranggießkokille verbleibt. In das Gießstrangende mit noch schmelzflüssigem Kern wird dann unmittelbar ein Verlängerungszapfen oder eine vorbereitete Anordnung aus Verbindungsmuffe, Zwischenplatte und Verlängerungszapfen mit den Verlängerungszapfen eingeführt. Während der Neubeschickung des Zwischenbehälters wird das Strangende um den Verlängerungszapfen fest, so daß dieser in das Strangende eingebunden wird. Für das Wiederanfahren der Anlage und Anbinden des neuen Gießstranges kann dann, wie oben beschrieben, die erfindungsgemäße Anordnung in Funktion treten. Auf diese Weise wird ein sehr schneller Chargenwechsel erreicht. Aus Gründen einheitlicher Definition im erfindungsgemäßen Sinne sei auch bei dieser Vorgehensweise das nachlaufende Ende des vorhergehenden Gießstranges als Kaltstrang bezeichnet, auch wenn es kein nur hilfsweise verwendeter Kaltstrang ist und noch keineswegs vollständig in den erstarrten Zustand übergegangen zu sein braucht.The arrangement variant described so far is also particularly suitable for connecting the new casting strand when changing batches. For this purpose, the casting strand must be stopped when the intermediate container becomes empty, so that its trailing end still remains in the continuous casting mold. An extension pin or a prepared arrangement of a connecting sleeve, intermediate plate and extension pin with the extension pin is then inserted directly into the end of the casting strand with a still molten core. During the new loading of the intermediate container, the end of the strand is fixed around the extension pin, so that it is integrated into the end of the strand. The arrangement according to the invention can then function as described above for restarting the system and connecting the new casting strand. In this way, a very quick batch change sel reached. For reasons of a uniform definition in the sense of the invention, the trailing end of the preceding casting strand is also referred to as a cold strand in this procedure, even if it is not a cold strand used only in an auxiliary manner and does not yet have to have completely changed to the solidified state.

Im folgenden wird die Erfindung unter Hinweis auf die schematischen Figuren der anliegenden Zeichnung noch näher erläutert. Darin zeigen:

  • Fig. I die prinzipielle Darstellung einer Stranggießanlage mit einer ersten Variante der erfindungsgemäßen Anordnung,
  • Fig. 2 eine vergrößerte Schnittdarstellung des Bereiches A aus Fig. I,
  • Fig. 3 einen Querschnitt entlang der Linie B-B in Fig. 2,
  • Fig. 4 eine zweite Variante einer erfindungsgemäßen Anordnung im Längsschnitt,
  • Fig. 5 einen Querschnitt entlang der Linie C-C in Fig. 4,
  • Fig. 6 eine dritte Variante der erfindungsgemäßen Anordnung und
  • Fig. 7 einen Querschnitt durch die Anordnung nach Fig. 6.
The invention is explained in more detail below with reference to the schematic figures of the accompanying drawing. In it show:
  • I the basic representation of a continuous casting plant with a first variant of the arrangement according to the invention,
  • 2 is an enlarged sectional view of area A from FIG. I,
  • 3 shows a cross section along the line BB in FIG. 2,
  • 4 shows a second variant of an arrangement according to the invention in longitudinal section,
  • 5 shows a cross section along the line CC in FIG. 4,
  • Fig. 6 shows a third variant of the arrangement according to the invention and
  • 7 shows a cross section through the arrangement according to FIG. 6.

Die in Fig. I ausschnittsweise Darstellung einer Stranggießanlage zeigt im grundsätzlichen Aufbau eine Pfanne I, einen Zwischenbehälter oder Tundish 2 und eine Stranggießkokille 3. Der Zwischenbehälter 2 ist in seinem Boden mit einer Ausflußöffnung 4 mit Schieberverschluß 5 für das flüssige Metall versehen. Anstatt eines Schieberverschlusses 5 kann auch ein Stpfverschluß bzw. ein Schieber-und Stopfverschluß oder ein anderes Verschlußmittel verwendet werden. Die Anlage dient vornehmlich der Erzeugung von Stahlguß. Die Stranggießkokille 3 weist einen Kokilleneintritt 6, einen Kokillenaustritt 7 und einen Kokillenhohlraum 8 auf. Die nur im Ausschnitt dargestellte Stranggießkokille 3 ist um den Kokillenhohlraum 8 herum von einem Kühlmittel 9 umflossen. Über dem Schieberverschluß 5 des Zwischenbehälters 2 ist eine Schieberfüllmasse 10, im wesentlichen eine bestimmte Sandmischung angeordnet, die bei geschlossenem Schieber 5 verhindern soll, daß die im Zwischenbehälter 2 befindliche Metallschmelze II in den Schiebermechanismus gelangt und diesen verlegt.The partial representation of a continuous caster in FIG. 1 shows the basic structure of a pan I, an intermediate container or tundish 2 and a continuous casting mold 3. The intermediate container 2 is provided in its bottom with an outlet opening 4 with a slide closure 5 for the liquid metal. Instead of a slide closure 5, a plug closure or a slide and plug closure or another closure means can also be used. The plant is primarily used to produce cast steel. The continuous casting mold 3 has a mold inlet 6, a mold outlet 7 and a mold cavity 8. The continuous casting mold 3, shown only in the detail, is surrounded by a coolant 9 around the mold cavity 8. Above the slide closure 5 of the intermediate container 2, a slide filling compound 10, essentially a certain sand mixture, is arranged which, when the slide 5 is closed, is to prevent the metal melt II located in the intermediate container 2 from entering the slide mechanism and moving it.

Unterhalb des Kokillenaustritts 7 ist, umgeben von dem strichpunktierten Kreis A, eine erfindungsgemäße Anordnung zum Anbinden eines neuen Gießstranges dargestellt, zu der ein lediglich mit seinem Ende dargestellter Kaltstrang 12 gehört. Beim Angießen der Anlage gelangt nach Öffnen des Schieberverschlusses 5 die Metallschmelze II aus dem Zwischenbehälter 2 in den durch die erfindungsgemäße Anordnung A vorübergehend unten verschlossenen Kokillenhohlraum 8, um mit ihrem vorlaufenden Ende eine im einzelnen noch zu beschreibende Verbindung mit dem Kaltstrang 12 einzugehen, mit dessen Hilfe der aus der Schmelze II gebildete neue Gießstrang in eine (nicht dargestellte) nachgeschaltete Treib- und Richtmaschine abgezogen wird.Below the mold outlet 7, surrounded by the dash-dotted circle A, an arrangement according to the invention for connecting a new casting strand is shown, to which a cold strand 12 shown only with its end belongs. When the system is poured on, after opening the slide closure 5, the molten metal II arrives from the intermediate container 2 into the mold cavity 8, which is temporarily closed at the bottom by the arrangement A according to the invention, in order to make a connection with the cold strand 12 to be described with its leading end, with the latter With the help of the new casting strand formed from the melt II is drawn off into a downstream driving and straightening machine (not shown).

Eine erste Ausführungsform einer erfindungsgemäßen Anordnung, die sich in der Position des Kreises A in Fig. 1 befinden kann, ist in den Fig. 2 und 3 im einzelnen dargestellt. In Anlage gegen die Unterseite 13 der Stranggießkokille 3 befindet sich eine Verbindungsmuffe 14, die aus einem Muffenmantel 15 und aus einem Muffenboden 16 besteht. Der Muffenmantel 15 weist einen lichten Querschnitt auf, der mit demjenigen des Kokillenaustritts 7 übereinstimmt, und die Verbindungsmuffe 14 ist deckungsgleich mit dem Kokillenaustritt 7 unter der Kokille 3 angeordnet.A first embodiment of an arrangement according to the invention, which can be in the position of circle A in FIG. 1, is shown in detail in FIGS. 2 and 3. In contact with the underside 13 of the continuous casting mold 3 there is a connecting sleeve 14 which consists of a sleeve jacket 15 and a sleeve base 16. The sleeve jacket 15 has a clear cross section which corresponds to that of the mold outlet 7, and the connecting sleeve 14 is arranged congruently with the mold outlet 7 under the mold 3.

Der Muffenboden 16 weist eine Bodenöffnung 17 auf, durch die hindurch der Kaltstrang 12 mit seinem Ende 18 von unten her um ein Stück in das Innere der Verbindungsmuffe 14 eingeführt ist. In einer Querbohrung 19 des Kaltstrangendes 18 ist ein Querbolzen 20 angeordnet, dessen überstehende Enden gegen den Muffenboden 16 anliegen, und durch den das Kaltstrangende 18 an einem Verlassen der Verbindungsmuffe 14 gehindert ist. Die Bodenöffnung 17 im Muffenboden 16 weist einen etwas größeren Querschnitt auf als das Kaltstrangende 18, so daß ein Ringspalt 21 verbleibt, der, wie weiter unten noch beschrieben wird, als Sandaustrittsöffnung dient.The socket bottom 16 has a bottom opening 17 through which the cold strand 12 is inserted with its end 18 from below into the interior of the connecting sleeve 14. A transverse bolt 20 is arranged in a transverse bore 19 of the cold strand end 18, the projecting ends of which abut against the socket bottom 16 and through which the cold strand end 18 is prevented from leaving the connecting sleeve 14. The bottom opening 17 in the socket bottom 16 has a somewhat larger cross section than the cold strand end 18, so that an annular gap 21 remains, which, as will be described further below, serves as a sand outlet opening.

Der Muffenmantel 15 kann mit Befestigungsmitteln versehen sein, die die feste und abdichtende Positionierung der Verbindungsmuffe 14 unterhalb der Stranggießkokille 3 ermöglichen. Geeignete Befestigungsmittel stehen im Stand der Technik zur Verfügung. Angedeutet sind im Muffenmantel 15 lediglich Nuten 22, in welche (nicht gezeigte) Befestigungshaken oder Klammern eingreifen können. Im Inneren der Verbindungsmuffe 14 sind einige Schrotteile 23 angeordnet.The sleeve jacket 15 can be provided with fasteners that allow the fixed and sealing positioning of the connecting sleeve 14 below the continuous casting mold 3. Suitable fasteners are available in the prior art. Only grooves 22 are indicated in the sleeve jacket 15, into which fastening hooks or clips (not shown) can engage. Some shot parts 23 are arranged inside the connecting sleeve 14.

Wird beim Angießen der Stranggießanlage der Schieberverschluß 5 des Zwischenbehälters in Fig. I geöffnet, so gelangt zuerst die rieselfähige Schieberfüllmasse 10 in die Verbindungsmuffe 14, und innerhalb dieser zwischen den Schrotteilen 23 hindurch auf den Boden der Verbindungsmuffe 14, von wo aus zumindest der wesentliche Teil des Sandes durch die Sandaustrittsöffnung 21 aus der Verbindungsmuffe nach unten austreten kann. Jedenfalls ist die innerhalb der Verbindungsmuffe verbleibende und weitgehend durch die Schrotteile 23 abgedeckte Sandmenge so gering, daß sie durch das ihr nachfolgende schmelzflüssige Metall bei dessen Aufprall in der Verbindungsmuffe nicht unmittelbar erreicht wird, weswegen eine Verunreinigung des Metalles durch den Schieberfüllsand verhindert wird. Die dichte Anlage der Verbindungsmuffe 14 an der Unterseite 13 der Gießkokille 3 verhindert einen Austritt der Metallschmelze aus der Kokille und der Verbindungsmuffe. Die erste, in die Verbindungsmuffe 14 eintretende Metallschmelze wird durch die Muffenwand 15 und die Schrotteile 23 sowie das Kaltstrangende 18 selbst, deren Aufschmelzen Schmelzwärme verbraucht, gekühlt, so daß sich vornehmlich parallel zum Muffenmantel, diesen einbeziehend eine Strangschale bildet, die zu einer kraftschlüssigen Verbindung zwischen der Muffe und dem Gießstrang führt, so daß nur wenig später der Kaltstrang 12 mit der Verbindungsmuffe 14 und dem an dieser angebundenen Gießstrang der Richtmaschine zugeführt werden kann, wodurch der kontinuierliche Gießvorgang begonnen wird.If the slide closure 5 of the intermediate container in Fig. I is opened when the continuous casting system is cast on, the free-flowing slide filling compound 10 first reaches the connecting sleeve 14, and within it between the shot parts 23 to the bottom of the connecting sleeve 14, from where at least the essential part of the sand can exit through the sand outlet opening 21 from the connecting sleeve downwards. In any case, the amount of sand remaining within the connecting sleeve and largely covered by the shot parts 23 is so small that it is not directly reached by the subsequent molten metal when it hits the connecting sleeve, which prevents contamination of the metal by the filler sand. The tight contact of the connecting sleeve 14 on the underside 13 of the casting mold 3 prevents the metal melt from escaping from the mold and the connecting sleeve. The first molten metal entering the connecting sleeve 14 is cooled by the sleeve wall 15 and the shot parts 23 and the cold strand end 18 itself, the melting of which consumes heat of fusion, so that a strand shell is formed parallel to the sleeve shell, including this, which forms a non-positive connection leads between the sleeve and the casting strand, so that only a short time later the cold strand 12 with the connecting sleeve 14 and the casting strand connected to the direction machine can be fed, whereby the continuous casting process is started.

Die Querschnittsdarstellung der Fig. 3 läßt erkennen, daß die Gießkokille 3 im Ausführungsbeispiel einen kreisrunden Querschnitt aufweist. Für den Fachmann ist es jedoch erkennbar, daß die Kokille je nach dem Erzeugnis, welches hergestellt werden soll, verschiedenste Querschnittskonfigurationen aufweisen kann, und daß die erfindungsgemäße Anordnung an jede dieser Querschnittskonfigurationen angepaßt werden kann, indem der Muffenmantel 15 einen entsprechenden Querschnitt aufweist, oder auch einen Querschnitt, der geringfügig größer ist als der Querschnitt des Kokillenaustrittes. Der für die dargestellte Anordnung hilfsweise verwendete Kaltstrang hat einen wesentlich geringeren Querschnitt als der Gießstrang, der hier im Beispiel sogar rechteckig ausgebildet ist. Hierauf kommt es jedoch nicht wesentlich an. Voraussetzung ist nur, daß der hilfsweise verwendete Kaltstrang der Richtmaschine zugeführt werden kann.3 shows that the casting mold 3 has a circular cross section in the exemplary embodiment. However, it will be apparent to the person skilled in the art that the mold can have a wide variety of cross-sectional configurations, depending on the product to be manufactured, and that the arrangement according to the invention can be adapted to each of these cross-sectional configurations by the sleeve jacket 15 having a corresponding cross-section, or else a cross section that is slightly larger than the cross section of the mold outlet. The cold strand used alternatively for the arrangement shown has a substantially smaller cross section than the casting strand, which in the example is even rectangular. However, this is not essential. The only requirement is that the auxiliary cold strand used can be fed to the straightening machine.

Die in den Fig. 4 und 5 dargestellte erfindungsgemäße Anordnung weicht von derjenigen gemäß den Fig. 2 und 3 in einigen Merkmalen ab, die im folgenden beschrieben werden sollen, im übrigen sind Teile, die denjenigen der Fig. 2 und 3 entsprechen, mit gleichen Bezugszeichen bezeichnet.The arrangement according to the invention shown in FIGS. 4 and 5 differs from that according to FIGS. 2 and 3 in some features which are to be described below, for the rest parts which correspond to those of FIGS. 2 and 3 are the same Reference numerals.

Bei der Anordnung gemäß Fig. 4 ragt das Kaltstrangende 18 weiter in die Verbindungsmuffe 14 hinein als bei der Anordnung nach Fig. 2. Gehalten ist das Kaltstrangende 18 durch einen verlängerten Querbolzen 24, der mit seinen Enden ein Stück oberhalb des Muffenbodens in gegenüberliegenden Bohrungen 25 im Muffenmantel 15 gelagert ist. Durch das tiefere Einführen des Kaltstrangendes 18 entsteht um dieses herum ein vertiefter Ringraum 26 unterhalb der Oberkante des Kaltstrangendes 18 in der Verbindungsmuffe 14. Dieser Ringraum ist teilweise mit Schrotteilen 23 angefüllt, und oberhalb der Schrotteile mit einem Metallgitter 26 abgedeckt.In the arrangement according to FIG. 4, the cold strand end 18 projects further into the connecting sleeve 14 than in the arrangement according to FIG. 2. The cold strand end 18 is held by an elongated transverse bolt 24, the ends of which extend a little above the socket bottom in opposite bores 25 is mounted in the sleeve jacket 15. Due to the deeper insertion of the cold strand end 18, a deepened annular space 26 is created around it below the upper edge of the cold strand end 18 in the connecting sleeve 14. This annular space is partially filled with shot parts 23 and covered with a metal grid 26 above the shot parts.

Die beim Angießen der Stranggießanlage zuerst aus dem Zwischenbehälter austretende Schieberfüllmasse 10 gelangt durch das Metallgitter 26 zwischen die Schrotteile 23 im Ringraum 26 und ist somit dem unmittelbaren Anprall durch die nachfolgende Metallschmelze entzogen. Eine Sandaustrittsöffnung ist bei dieser Ausführungsform nicht unbedingt erforderlich, kann aber zusätzlich auch noch vorgesehen werden. Schrotteile und Metallgitter, die vorzugsweise die gleiche Zusammensetzung aufweisen wie das Gießmetall, tragen zur Kühlung der Metallschmelze im unteren Bereich der Verbindungsmuffe bei. Im übrigen erfolgt der Anbindungsvorgang des neuen Gießstranges wie in Verbindung mit den Fig. 2 und 3 bereits beschrieben.The slide filling compound 10 emerging from the intermediate container when the continuous casting installation is poured on passes through the metal grid 26 between the shot parts 23 in the annular space 26 and is thus removed from the direct impact by the subsequent metal melt. A sand outlet opening is not absolutely necessary in this embodiment, but can also be provided. Shot parts and metal grids, which preferably have the same composition as the cast metal, contribute to cooling the molten metal in the lower region of the connecting sleeve. Otherwise, the connection process of the new casting strand takes place as already described in connection with FIGS. 2 and 3.

Es kann zweckmäßig sein, den Muffenboden 16 in gewissem Spaltabstand vom Muffenmantel 15 anzuordnen. Durch diesen Spalt eventuell austretende geringe Mengen an Metallschmelze werden durch den auf dem Muffenboden 16 aufliegenden Asbestschnurring 27 aufgehalten. Zu diesem Zweck ist der Muffenboden größer als der Außenquerschnitt des Muffenmantels. Überdies ist er abweichend vom Muffenmantel quadratisch ausgebildet. Diese Formgebung kann aus Herstellungsgründen zweckmäßig sein.It may be expedient to arrange the sleeve base 16 at a certain gap distance from the sleeve jacket 15. Small amounts of molten metal that may escape through this gap are stopped by the asbestos cord ring 27 resting on the socket base 16. For this purpose, the sleeve base is larger than the outer cross section of the sleeve jacket. In addition, it is square, in contrast to the sleeve jacket. This shape can be useful for manufacturing reasons.

Eine andere Ausführungsform der erfindungsgemäßen Anordnung ist in den Fig. 6 und 7 dargestellt. Die hier verwendete Verbindungsmuffe 14 besteht allein aus dem Muffenmantel 15, welcher einen etwas geringeren Querschnitt aufweist als der Kokillenhohlraum 8, so daß die Verbindungsmuffe 14 unter Belassen eines Spaltraumes 28 zwischen Muffenmantel 15 und Kokilleninnenwand in das Innere des Kokillenhohlraumes 8 einführbar ist. Die Fig. 6 zeigt die Verbindungsmuffe 14 im Inneren des Kokillenhohlraumes 8 angeordnet. Da bei dieser Ausführungsform ein Kaltstrang 12 Verwendung findet, dessen Querschnitt nahezu dem Querschnitt des Kokillenhohlraumes 8 entspricht, ist zur Verbindung des Endes des Kaltstranges 12 mit der Verbindungsmuffe 14 ein Verlängerungszapfen 29 vorgesehen, der mit seinem unteren Ende in einer axialen Ausnehmung 30 im Ende des Kaltstranges 12 ruht und dort mittels eines Sicherungsbolzens 31 verankert ist, der sich durch fluchtende Bohrungen 32 im Verlängerungszapfen und im Kaltstrang erstreckt. Innerhalb der Verbindungsmuffe 14 ist der Verlängerungszapfen 29, wie für das Kaltstrangende 18 in Verbindung mit Fig. 4 beschrieben, befestigt. Um den Spaltraum 28 zwischen Verbindungsmuffe 14 und Kokilleninnenwand nach unten gegen den Durchtritt von Metallschmelze abzudichten, ist zwischen dem Kaltstrangende 18 und der Verbindungsmuffe 14 eine Zwischenplatte 33 aus einem Dämmstoff angeordnet, die kragenartig über den Außenumfang der Verbindungsmuffe 14 vorsteht und sich bis an die Kokilleninnenwand erstreckt. Der kragenartige Überstand dieser Zwischenplatte ist ebenfalls mit Schrotteilen für die Kühlung der dorthin gelangenden Schmelze belegt.Another embodiment of the arrangement according to the invention is shown in FIGS. 6 and 7. The connecting sleeve 14 used here consists solely of the sleeve casing 15, which has a somewhat smaller cross section than the mold cavity 8, so that the connecting sleeve 14 can be inserted into the interior of the mold cavity 8 while leaving a gap 28 between the sleeve casing 15 and the mold inner wall. 6 shows the connecting sleeve 14 arranged in the interior of the mold cavity 8. Since in this embodiment a cold strand 12 is used, the cross section of which almost corresponds to the cross section of the mold cavity 8, an extension pin 29 is provided for connecting the end of the cold strand 12 to the connecting sleeve 14, which has its lower end in an axial recess 30 in the end of the Cold strand 12 rests and is anchored there by means of a securing bolt 31 which extends through aligned bores 32 in the extension pin and in the cold strand. The extension pin 29 is fastened within the connecting sleeve 14, as described for the cold strand end 18 in connection with FIG. 4. In order to seal the gap 28 between the connecting sleeve 14 and the inner mold wall downwards against the passage of molten metal, an intermediate plate 33 made of an insulating material is arranged between the cold strand end 18 and the connecting sleeve 14, which protrudes like a collar over the outer circumference of the connecting sleeve 14 and extends as far as the inner mold wall extends. The collar-like protrusion of this intermediate plate is also covered with shot parts for cooling the melt reaching there.

Wenn nach Positionieren der in den Fig. 6 und 7 dargestellten Anordnung und nach Öffnen des Schieberverschlusses 5 Metallschmelze in die Stranggießkokille 3 gelangt, tritt diese einerseits in das Innere der Verbindungsmuffe 14, andererseits aber auch in den Spaltraum zwischen deren Mantel 15 und der Kokillenwand ein. Die in den Spaltraum 28 eindringende Schmelze wird bevorzugt durch die gekühlte Kokillenwand wie auch durch die Muffenwand 15 gekühlt, wobei sie erstarrt und eventuell zum Teil mit der Muffenwand 15 verschmilzt, wodurch sich der Anfang einer Strangschale bildet, die eine kraftschlüssige Verbindung mit der Verbindungsmuffe 14 eingeht. Die Schrotteile 34 auf der Zwischenplatte 33 außerhalb der Verbindungsmuffe 14 tragen zum Erstarren der Schmelze im unteren Bereich des Spaltraumes 28 bei, wodurch die Schmelze am Zerstören der Zwischenplatte und am vorzeitigen Austritt aus dem Kokillenhohlraum gehindert wird. Nach etwa 10 Sekunden oder weniger nach der Schieberverschlußöffnung kann die Anordnung aus Kaltstrang und Verbindungsmuffe mit dem angebundenen neuen Gießstrang der Treib-und Richtmaschine zugeführt werden.If, after positioning the arrangement shown in FIGS. 6 and 7 and after opening the slide closure 5, molten metal enters the continuous casting mold 3, this occurs on the one hand into the interior of the connecting sleeve 14, but on the other hand also into the gap between the jacket 15 and the mold wall . The melt penetrating into the gap 28 is preferably cooled by the cooled mold wall as well as by the sleeve wall 15, where it solidifies and possibly melts in part with the sleeve wall 15, thereby forming the beginning of a strand shell which forms a non-positive connection with the connecting sleeve 14 comes in. The shot parts 34 on the intermediate plate 33 outside the connecting sleeve 14 contribute to the solidification of the melt in the lower region of the gap space 28, whereby the melt is prevented from destroying the intermediate plate and from premature escape from the mold cavity. After approximately 10 seconds or less after the slide closure opening, the arrangement of cold strand and connecting sleeve with the connected new casting strand can be fed to the driving and straightening machine.

Die Positionierung der in Fig. 6 dargestellten Anordnung erfolgt zweckmäßigerweise, indem zuerst das Kaltstrangende 18 von unten durch die Kokille 3 hindurchbewegt, oberhalb der Kokille unter Einschieben der Querbolzen mit der Muffenanordnung versehen und anschließend die Muffenanordnung in das Innere der Kokille abwärts bewegt wird. Da Verbindungsmuffe und Kaltstrangende unverschiebbar miteinander verbunden sind, kann die Anordnung durch Halten des Kaltstranges 12 solange wie erforderlich in der dargestellten Position festgehalten werden.The arrangement shown in FIG. 6 is advantageously positioned by first moving the cold strand end 18 through the mold 3 from below, above the mold under 1 push the cross bolt with the sleeve arrangement and then the sleeve assembly is moved down into the interior of the mold. Since the connecting sleeve and the cold strand end are connected to one another in a non-displaceable manner, the arrangement can be held in the illustrated position by holding the cold strand 12 as long as required.

Der Fig. 7 läßt sich entnehmen, daß hier eine Stranggießkokille mit quadratischem Querschnitt dargestellt ist, dem auch der Querschnitt der Verbindungsmuffe und des Kaltstranges entsprechen.7 that a continuous casting mold with a square cross section is shown, which also corresponds to the cross section of the connecting sleeve and the cold strand.

Die zuletzt beschriebene Anordnung kann vorteilhaft auch zur schnellen Abwicklung eines Chargenwechsels verwendet werden, indem beispielsweise der Verlängerungszapfen 29 in den noch schmelzflüssigen Kern des endenden Gießstranges eingesetzt wird, worauf nach dessen Verankerung durch Erkalten des Gießstrangendes aus dem beendeten Gießvorgang die Anordnung, wie oben beschrieben, für ein Anbinden des neuen Gießstranges bereitgestellt werden kann.The arrangement described last can advantageously also be used for the rapid processing of a batch change, for example by inserting the extension pin 29 into the still molten core of the ending casting strand, whereupon after it is anchored by cooling the casting strand end from the completed casting process, the arrangement, as described above, can be provided for connecting the new casting strand.

Claims (19)

1. A method for the attachment of a new strip in a continuous casting plant of the type comprising an intermediate container (tundish 2) for the liquid metal (11) to be cast having a discharge opening (4) with closure means (5) in its bottom, a chilled continuous casting mold (3) arranged under the discharge opening (4) and defining a mold inlet (6), a mold cavity (8) and a lower mold outlet (7), as well as, if necessary, an immersion tube disposed between discharge opening (4) and casting mold (3) and projecting into the mold cavity (8), in which (method) the mold outlet (7) is at least substantially closed temporarily, and after the opening of the closure means (5), by solidification of the liquid metal (11) flowed out of the discharge opening, a connection is established to the end of a cold billet (12) being provided with connecting means, whereupon the cold billet (12) is drawn off together with the attached strip, characterized in that, as connection means, a hollow attachement coupling (14) is used being securable at the end (18) of the cold billet, open at the top and at least largely closed, the cross-sectional shape of its side being similar to the cross-sectional contour of the mold cavity (8), and that the mold outlet (7) is essentially closed by means of this attachment coupling (14).
2. An arrangement for the attachment of a new strip, in a continuous casting plant of the type comprising an intermediate container (tundish 2) for the liquid metal (11) to be cast having a discharge opening (4) with closure means (5) in its bottom, a chilled continuous casting mold (3) arranged under the discharge opening (4) and defining a mold inlet (6), a mold cavity (8) and a lower mold outlet (7), as well as, if necessary, an immersion tube disposed between discharge opening (4) and casting mold (3) and projecting into the mold cavity (8), said arrangement comprising means for the at least considerable closing of the mold outlet (7) as well as a cold billet (12) terminating in the domain of said mold (3), said billet being provided with attachment means for the formation of a connection with said first solidifying liquid metal (11) issuing from the outlet opening (4), characterized in that the attachment means consist of a pot-like hollow attachment coupling (14) which is open at its top end and at least substantially closed at its lower end and which is arranged at the end (18) of the cold billet (12), said attachment coupling having a cross sectional shape of its side which is similar to the cross sectional contour of the mold cavity (8) and by which attachment coupling the mold outlet (7) is at least essentially closed.
3. The arrangement according to claim 2, characterized in that for securing the cold billet (12) to the attachment coupling (14), the end (18) of the cold billet (12) itself or an axial extension pin (29) connected with the cold billet (12) and having a smaller cross section than that of the cold billet is introduced into the interior of the attachment coupling (14) by way of an appropriate opening (17) in the bottom (16) of the attachment coupling (14) in forming an annular space (26) towards the inner wall of the coupling (14) along a portion of the length of the coupling and is secured there against a return stroke by means of a transverse pin (20, 24) piercing the cold billet end (18) or said extension pin (19).
4. The arrangement according to claim 3, characterized in that the ends of the transverse pin (20) projecting from the cold billet end (18) or from the extension pin (29) bear against the bottom (16) of the attachment coupling (14).
5. The arrangement according to claim 3, characterized in that the ends of the transverse pin (24) projecting from the cold billet end (18) or from the extension pin (29) are borne in opposite holes (25) in the wall (15) of the attachment coupling (14).
6. The arrangement according to anyone of claims 3 to 5, characterized in that a sand escape opening (21) is provided in the attachment coupling bottom (16) of the annular space (26).
7. The arrangement according to claim 6 wherein the cold billet end (18) extends into the interior of the attachment coupling, characterized in that the sand escape opening is formed by an opening gap (21) between the cold billet end (18) and the attachment coupling bottom (16).
8. The arrangement according to anyone of claims 3 to 7, characterized in that the annular space (26) comprises pieces of scrap (23) preferably from the cast metal.
9. The arrangement according to claim 8, characterized in that the annular space (26) above the pieces of scrap is covered up by a grate (26), preferably made from the material of the cast metal.
10. The arrangement according to anyone of claims 3 to 9 comprising an extension pin (29) on the cold billet end (18), characterized in that the extension pin (29) is fitted into an axial recess (30) of the cold billet end (18) and secured therein by means of a transversely extending securing pin (31).
11. The arrangement according to anyone of claims 3 to 8 comprising an extension pin (29) on the cold billet end (18), characterized in that said extension pin (29) is fused into the cold billet end.
12. The arrangement according to anyone of claims 2 to 11, characterized in that the clear internal cross section of the attachment coupling (14) corresponds to the internal cross section of the mold (3) and that the attachment coupling (14) is maintained in position aligned with the mold outlet (7) in that its upper edge bears against the lower face (13) of the mold (3).
13. The arrangement according to claim 12, characterized in that the bottom (16) of the attachment coupling (14) defines a gap with the lower edge of the attachment coupling side wall (15) and has its periphery projecting beyond the periphery of the attachment coupling hereby forming a marginal edge and that the marginal edge is provided with means for checking the flow of the cast metal, such as for example pieces of scrap.
14. The arrangement according to claims 2 to 12, characterized in that the attachment coupling (14) is insertable into the mold cavity (8) and is arranged therein.
15. The arrangement according to claim 14, characterized in that a clearance gap (28) is designated between the inner wall of the mold and the outer wall of the attachment coupling.
16. The arrangement according to claim 15 wherein the cold billet end (18) is provided with an extension pin (29), characterized in that between the cold billet end (18) and the wall (15) of the attachment coupling an intermediate plate (33), preferably made from insulating material, is arranged projecting like a collar beyond the periphery of the attachment coupling and shutting off the clearance gap (28) between the attachment coupling (14) and the inner wall of the mold towards the bottom.
17. The arrangement according to claim 16, characterized in that the projecting collar of the intermediate plate (33) is covered with pieces of metal scrap (34), preferably of the cast metal.
18. The arrangement according to claim 16 or 17, characterized in that the cold billet cross section generally corresponding to the mold cavity cross section and that the extension pin (29) is fused into the cold billet end (18).
19. The arrangement according to anyone of claims 2 to 17, characterized in that, with the exception of the intermediate plate, the component parts of the attachment coupling consist of metal, preferably the cast metal.
EP86118083A 1986-01-03 1986-12-27 Method and device for connecting a new continuously cast ingot in a continuous-casting machine Expired - Lifetime EP0231520B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3600042 1986-01-03
DE3600042 1986-01-03
DE3629043A DE3629043C2 (en) 1986-01-03 1986-08-27 Arrangement for connecting a new casting strand in a continuous caster
DE3629043 1986-08-27

Publications (3)

Publication Number Publication Date
EP0231520A1 EP0231520A1 (en) 1987-08-12
EP0231520B1 true EP0231520B1 (en) 1990-08-08
EP0231520B2 EP0231520B2 (en) 1993-10-13

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EP86118083A Expired - Lifetime EP0231520B2 (en) 1986-01-03 1986-12-27 Method and device for connecting a new continuously cast ingot in a continuous-casting machine

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EP (1) EP0231520B2 (en)
DE (1) DE3673379D1 (en)
ES (1) ES2016928T5 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916287C1 (en) * 1989-05-19 1990-08-09 Dislich, Geb. Hoyer, Margrit, Dr., 4100 Duisburg, De Joining up dummy bar in continuous steel casting - by leaving gap between mould wall and sleeve, lining plate with paper or plastic foil etc.
CA2017197C (en) * 1989-05-19 1998-09-15 Margrit Dislich Apparatus and method for the connection of a new cast strip in a continuous casting operation
IT1291722B1 (en) * 1997-05-05 1999-01-21 Langonnaise S A H HEAD DEVICE FOR A CONTINUOUS CASTING PROCESS OF BILLETS
FR3009216B1 (en) * 2013-11-13 2015-09-04 Aubert & Duval Sa TOOLING FOR ATTACHING A HITCH HEAD TO A CASTING ELECTRODE IN A MOLD, AND ASSOCIATED INSTALLATION AND METHOD
CN113477895A (en) * 2021-07-08 2021-10-08 攀钢集团攀枝花钢钒有限公司 Casting starting device for small continuous casting square billet crystallizer and construction method
CN114082905B (en) * 2021-11-24 2023-03-24 广东韶钢松山股份有限公司 Small square billet dummy bar head connecting assembly and assembling method thereof
CN114632917B (en) * 2022-03-18 2023-09-08 重庆钢铁股份有限公司 Method for online treatment of inner blank shell of crystallizer by continuous casting machine
CN115055655A (en) * 2022-05-14 2022-09-16 江阴兴澄特种钢铁有限公司 Casting device and method for oversized continuous casting round billet
CN117300085B (en) * 2023-10-11 2024-07-02 清远楚江高精铜带有限公司 Forming die and drawing and casting forming equipment
CN117415292B (en) * 2023-11-01 2024-05-07 江苏兴成新材料有限公司 High-precision copper strip horizontal continuous casting unit automation equipment

Citations (1)

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AT227394B (en) 1961-07-03 1963-05-10 Concast Ag Device for releasing the cold strand from the approach head in continuous casting plants

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FR1075076A (en) * 1952-02-27 1954-10-12 Boehler & Co Ag Geb Bottom obturator for bar casting shells
FR1054527A (en) * 1952-04-16 1954-02-11 Boehler & Co Ag Geb Process for sealing shells for bar casting of metals, in particular iron and steel
DE2611793C2 (en) * 1976-03-19 1985-10-24 Stoody Co., Santa Fe Springs, Calif. Start-up head for horizontal continuous casting and method for starting up horizontal continuous casting
GB2027374B (en) * 1978-06-20 1982-09-08 Kawasaki Steel Co Method of sequential continuous-casting of different grades of steel
FI832828A (en) * 1983-08-05 1985-02-06 Proizv Obiedininie Uralmash KOLV FOER ANVAENDNING I FORMEN PAO EN HORISONTELL STRAENGGJUTNINGSMASKIN FOER FRAMSTAELLNING AV RUNDA TACKOR.

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
AT227394B (en) 1961-07-03 1963-05-10 Concast Ag Device for releasing the cold strand from the approach head in continuous casting plants

Also Published As

Publication number Publication date
DE3673379D1 (en) 1990-09-13
ES2016928B3 (en) 1990-12-16
EP0231520B2 (en) 1993-10-13
EP0231520A1 (en) 1987-08-12
ES2016928T5 (en) 1995-08-16

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