EP0023034A1 - Method of recalibrating a worn conical tube, especially a curved tubular mould for continuous casting - Google Patents

Method of recalibrating a worn conical tube, especially a curved tubular mould for continuous casting Download PDF

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Publication number
EP0023034A1
EP0023034A1 EP80104173A EP80104173A EP0023034A1 EP 0023034 A1 EP0023034 A1 EP 0023034A1 EP 80104173 A EP80104173 A EP 80104173A EP 80104173 A EP80104173 A EP 80104173A EP 0023034 A1 EP0023034 A1 EP 0023034A1
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EP
European Patent Office
Prior art keywords
mold
tube
mandrel
continuous casting
conical
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EP80104173A
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German (de)
French (fr)
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EP0023034B1 (en
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Diethelm Mettler
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Accumold AG
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Accumold AG
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Priority to AT80104173T priority Critical patent/ATE2654T1/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/06—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
    • B21D26/08—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves generated by explosives, e.g. chemical explosives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49748—Repairing by shaping, e.g., bending, extruding, turning, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49805—Shaping by direct application of fluent pressure
    • Y10T29/49806—Explosively shaping

Definitions

  • the invention relates to a method for recalibrating a worn, conical, in particular bent, mold tube for continuous casting, wherein a single-gauge mandrel is inserted into the mold cavity, explosives are attached to the outside of the tube, and the mold cavity is deformed by its detonation to the dimensions of the gauge mandrel.
  • the walls of these molds forming the mold cavity are made of copper or copper alloys.
  • the walls of these molds forming the mold cavity are made of copper or copper alloys.
  • they are usually made from pipes.
  • the majority of the tubular molds is provided with a taper towards the withdrawal side of the strand.
  • thermal voltages that cannot be avoided lead to the mold tube being drawn in in the area of the bath level and to widening, reinforced by abrasion, at the end of the mold that withdraws from the strand, which leads to an undesirable “wrong conicity”.
  • the method according to the invention makes it possible to provide a conical mold with an opposite conicity, i.e. the original strand exit side of the used mold becomes the pouring side of the recalibrated mold, whereby the remaining errors mentioned in the former bath level area reach the area of the new strand exit end.
  • these defects have no negative influence on the solidification behavior of the strand, since a strand skin has already formed in this area of the mold, liquid steel no longer has access to the mold wall and can therefore no longer penetrate into the cracks. Surface defects on the solidified strand or strand breakthroughs in the mold can thus be avoided.
  • a mold tube, which previously had to be scrapped, can be used for at least one further mold trip due to the recalibration according to the invention.
  • the cross section of the original strand exit side of the mold is widened to make it easier to insert the mandrel becomes. This is conveniently done by explosive deformation, advantageously explosive charges being detonated in the four corner areas of the mold cavity and at the same time essentially in the central areas of the outside of the mold tube.
  • the caliber mandrel By widening the tube end with a smaller cross section before recalibration, the caliber mandrel can be inserted easily even in the case of mold tubes that are very strongly drawn in the bath level area. By attaching the explosive charges, a uniform cross-sectional enlargement is achieved on all sides. As a result, mold tubes, which due to the described indentations and the associated intolerable changes in conicity could no longer be used or renewed, are also recalibrated and thus used again.
  • the caliber mandrel 2 is introduced in the direction of the arrow 7, the tube part 10 shown in broken lines being expanded further in accordance with the shape of the caliber mandrel 2.
  • the deformation imposed on the tubular part 10 in this way is partly plastic, partly elastic.
  • an air gap 11 is created due to the conicity oriented towards one another, which can be up to a few millimeters depending on the shape of the caliber mandrel 2.
  • the mold tube ends are then closed by means of base plates (not shown), 12 explosive charges are attached to the outside of the tube, mold tube 1 and mandrel 2 are placed as a unit in a container filled with water and the charges are electrically ignited.
  • the mold tube 1 is plastically deformed with its inner dimensions onto the outer dimension of the mandrel 2, the nominal dimension. This reverses the original taper of the mold tube. In this way, healthy, crack-free pipe material gets into the new bath level area, while the existing surface defects 13 in the area of the new strand outlet, in which they have no negative E inchen can exert on the slab quality, be relocated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Continuous Casting (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Ein Verschlissenes, an der inneren Rohrwand im ehemaligen Badspiegelbereich irreparable Oberflächenfehler (13) aufweisendes, konisches Kokillenrohr (1) für das Stranggiessen wird durch Sprengverformung über einen Kaliberdorn (2) mit einer neuen, umgekehrten Konizität versehen, wodurch die Oberflächenfehler (13) in den Bereich des neuen Strangaustrittes und gesundes, rissfreies Kokillenmaterial in den neuen Badspiegelbereich gelangen.A worn conical mold tube (1) for continuous casting, which has irreparable surface defects (13) on the inner tube wall in the former bathroom mirror area, is provided with a new, reverse conicity by explosive deformation via a caliber mandrel (2), whereby the surface defects (13) in the Area of the new strand outlet and healthy, crack-free mold material in the new bathroom mirror area.

Description

Die Erfindung betrifft ein Verfahren zum Rekalibrieren eines verschlissenen, konischen, insbesondere gebogenen Kokillenrohres für das Stranggiessen, wobei ein-Kaliberdorn in den Kokillenhohlraum eingeführt, Sprengstoff auf der Rohraussenseite angebracht und durch dessen Detonation der Formhohlraum auf die Abmessungen des Kaliberdornes verformt wird.The invention relates to a method for recalibrating a worn, conical, in particular bent, mold tube for continuous casting, wherein a single-gauge mandrel is inserted into the mold cavity, explosives are attached to the outside of the tube, and the mold cavity is deformed by its detonation to the dimensions of the gauge mandrel.

Beim Stranggiessen von Metall, insbesondere von Stahl, werden Durchlaufkokillen mit gerader oder gebogener Form verwendet. Im allgemeinen sind die den Formhohlraum bildenden Wände dieser Kokillen aus Kupfer bzw. Kupferlegierungen gefertigt. Für kleinere Strangquerschnitte, z.B. Knüppel und kleinere Vorblockformate, sind sie in der Regel aus Rohren hergestellt. Um die bei vielen Stahlqualitäten ausgeprägte Schrumpfung des in der Kokille oberflächlich erstarrenden Stranges im Hinblick auf eine ausreichende Kühlung zu kompensieren, ist der grösste Teil der Rohrkokillen mit einer zur Abzugsseite des Stranges hin zulaufenden Konizität versehen. Besonders im Badspiegelbereich und hier vor allem bei Anlagen mit Badspiegelregulierungen sind die Kokillen einem besonderen Verschleiss ausgesetzt, wodurch es zu Beschädigungen der Kokillenoberfläche, wie z.B. grossflächigen Ausfressungen und oftmals tiefgehenden Rissen, insbesondere bei Rohren mit hohen Gusszahlen, kommt.In the continuous casting of metal, particularly of steel, D urchlaufkokillen with a straight or curved used. In general, the walls of these molds forming the mold cavity are made of copper or copper alloys. For smaller strand cross-sections, such as billets and smaller bloom formats, they are usually made from pipes. In order to compensate for the pronounced shrinkage of the strand solidifying on the surface in the mold with regard to adequate cooling, the majority of the tubular molds is provided with a taper towards the withdrawal side of the strand. Especially in the bath level and especially in systems with Badspiegelregulierungen the molds are subjected to a special wear, resulting in damage to the okillenoberfläche K, such as large-scale Ausfressungen and often deep cracks, especially in pipes with high casting speeds, comes.

Nicht zu vermeidende thermische Spannungen führen obendrein zu einem Einziehen des Kokillenrohres im Badspiegelbereich und zu einem Aufweiten, verstärkt durch Abrieb, am Strangabzugsende der Kokille, wodurch es zu einer unerwünschten "verkehrten Konizität" kommt.In addition, thermal voltages that cannot be avoided lead to the mold tube being drawn in in the area of the bath level and to widening, reinforced by abrasion, at the end of the mold that withdraws from the strand, which leads to an undesirable “wrong conicity”.

Die Herstellung eines gezogenen, konischen Kokillenrohres mit erforderlichen kleinstmöglichen Toleranzen bedarf eines grossen, apparativen Aufwandes und ist dadurch mit erheblichen Rosten verbunden, speziell bei Kokillenrohren mit gebogenem Formhohlraum. Um die Lebensdauer solcher teuren Kokillenrohre durch Wiederaufbereitung zu erhöhen, sind spezielle Techniken der Rekalibrierung entwickelt worden. Kokillenrohre mit unterschiedlichen Konussen waren von der Rekalibrierung ausgeschlossen.The production of a drawn, conical ingot tube with the smallest possible tolerances required requires a great deal of equipment and is therefore associated with considerable rusting, especially in the case of ingot tubes with a curved mold cavity. Special recalibration techniques have been developed to increase the service life of such expensive mold tubes through reprocessing. Chill pipes with different cones were excluded from recalibration.

Zurzeit werden gebrauchte Kokillen mit praktisch unveränderter Konizität und mehr oder weniger nur unmassgebenden Beschädigungen, wie z.B. oberflächliche Risse in der Rohrinnenwand, nach einer Kokillenreise für den weiteren Betrieb zur Instandsetzung einer mechanischen Nachbearbeitung, wie z.B. Schleifen, Hobeln etc. der Innenflächen, unterworfen. Eine solche Verfahrensweise ist jedoch automatisch mit einer, oftmals einige Millimeter betragenden Formatvergrösserung verbunden, was wegen der nachgeschalteten Weiterverarbeitung des Stranggussmaterials, z.B. im Walzwerk, wegen der dort vorgegebenen Stichkaliber in den meisten Fällen nicht tolerierbar ist.Currently used molds with practically unchanged taper and more or less only immaterial damage, such as superficial cracks in the inner tube wall after a mold trip for further operation to repair a mechanical post-processing, e.g. Grinding, planing etc. of the inner surfaces, subject. However, such a procedure is automatically associated with a format enlargement, often amounting to a few millimeters, which is due to the subsequent further processing of the continuous casting material, e.g. in the rolling mill, due to the pass caliber specified there, is in most cases not tolerable.

Diese Nachteile sind mit einem aus der DE-AS 25 33 528 bekannten, bisher wenig angewendeten, weiteren Verfahren teilweise verbessert worden, mit dessen Hilfe es zum einen möglich ist, konische, aber auch unterschiedlich konische, gebogene Kokillen durch Verformung eines Rohlings über eine Matrize mittels Sprengstoff herzustellen und zum anderen auf gleiche Art und Weise gebrauchte, durch Verschleiss aufgeweitete Kokillenrohre wieder auf die ursprünglichen Kokillenmasse zu verkleinern. Die Wände des Formhohlraumes sollen hierdurch in der Regel wiederum die Eigenschaften einer neuen Kokille erhalten.These disadvantages have been partially improved by means of a further method known from DE-AS 25 33 528, which has hitherto been rarely used, with the aid of which it is possible, on the one hand, to have conical, but also differently conical, curved molds by deforming a blank via a die using explosives and the other in the same way to reduce used mold tubes, which have been expanded by wear, back to the original mold mass. As a rule, the walls of the mold cavity should in turn be given the properties of a new mold.

In der Praxis jedoch hat es sich gezeigt, dass die aufgrund der schon erwähnten Badspiegelregulierungen tiefergehenden Risse durch das beschriebene Rekalibrieren nicht mehr weggebracht werden können. Eine Ueberlappung der Risswände während der Sprengverformung ist die Folge, wodurch es zu unzumutbaren Oberflächenfehlern, auch noch nach allfälliger Verchromung, kommt, welche einen Wiedergebrauch der Kokillenrohre aufgrund schlechter Strangoberflächenqualität auch weiterhin ausschliessen. Denn bei erneutem Einsatz der Kokillenrohre in ihrer ursprünglichen Lage befänden sich die nur teilweise geschlossenen Risse wieder im Bereich der grössten thermischen Beanspruchung, würden sich wieder öffnen und flüssiger Stahl könnte in sie eindringen, was einerseits zu Durchbrüchen, anderseits zu Löchern in der Kokillenwand, verbunden mit einem gefährlichen Kühlwasseraustritt, führen kann. Ein notwendiges, solche Ueberlappungen vermeidendes tiefes Ausschleifen der Risse vor der Sprengverformung jedoch, würde in dem entsprechenden Rohrbereich zu einer unzulässigen Schwächung der Kokillenwand führen. Derartige Kokillen können im Giessbetrieb nicht mehr eingesetzt werden und haben daher nach dem heutigen Stand der Technik nur noch Schrottwert. Da Badspiegelregulierungsvorrichtungen eine ständig zunehmende Verwendung finden, nimmt demzufolge die Zahl derart geschädigter Kokillenrohre immer mehr zu, was den Vorteil einer genauen Regulierung des Badspiegels auf der einen Seite durch erhöhten Kokillenausschuss auf der anderen Seite empfindlich schmälert.In practice, however, it has been shown that the deeper cracks due to the bath level regulation already mentioned can no longer be removed by the recalibration described. An overlap of the crack walls during the explosive deformation is the result, which leads to unreasonable surface defects, even after any chrome plating, which also prevent reuse of the mold tubes due to poor strand surface quality. Because when the mold tubes are used again in their original position, the only partially closed cracks would again be in the area of the greatest thermal stress, would open again and liquid steel could penetrate them, which on the one hand would lead to breakthroughs and on the other hand to holes in the mold wall with a dangerous cooling water leak. However, if the cracks were to be deeply ground before the explosive deformation to avoid such overlaps, this would lead to an inadmissible weakening of the mold wall in the corresponding tube area. Such molds can no longer be used in casting operations and therefore only have scrap value according to the current state of the art. As bath level regulating devices are in ever increasing use, the number of mold tubes damaged in this way is increasing more and more, which significantly reduces the advantage of precise regulation of the bath level on the one hand by increased mold scrap on the other.

Hier setzt die Erfindung ein, deren Ziel es ist, ein Rekalibrieren eines stark verschlissenen, herkömmlicherweise schrottreifen Kokillenrohres zu ermöglichen und auf diese Weise die Lebensdauer des Kokillenrohres, mit geringerem Kostenaufwand gegenüber neuen Kokillenrohren, wesentlich zu verlängern.This is where the invention comes in, the aim of which is to make it possible to recalibrate a heavily worn, conventionally scrap-ready mold tube and in this way to significantly extend the life of the mold tube at a lower cost compared to new mold tubes.

Dies wird dadurch erreicht, dass für konische Kokillenrohre der konisch ausgebildete Kaliberdorn mit seiner kleineren Stirnfläche von der ursprünglichen Strangaustrittseite des Kokillenrohres her eingeführt, und diese Strangaustrittseite mittels der Explosivkraft zur Eingiessseite verformt wird.This is achieved in that, for conical mold tubes, the conical mandrel with its smaller end face is inserted from the original strand outlet side of the mold tube, and this strand outlet side is deformed to the pouring side by means of the explosive force.

Durch das erfindungsgemässe Verfahren ist es möglich, eine konische Kokille mit einer umgekehrten Konizität zu versehen, d.h. die ursprüngliche Strangaustrittseite der gebrauchten Kokille wird zur Eingiessseite der rekalibrierten Kokille, wodurch erwähnte verbleibende Fehler im ehemaligen Badspiegelbereich in den Bereich des neuen Strangaustrittsendes gelangen. Diese Fehler haben dort im Gegensatz zum Badspiegelbereich keinerlei negativen Einfluss auf das Erstarrungsverhalten des Stranges, da sich in diesem Bereich der Kokille eine Stranghaut bereits gebildet, flüssiger Stahl keinen Zutritt mehr zur Kokillenwand hat und damit nicht mehr in die Risse eindringen kann. Oberflächenfehler am erstarrten Strang bzw. Strangdurchbrüche in der Kokille können folglich vermieden werden. Ein Kokillenrohr, welches bisher der Verschrottung zugeführt werden musste, kann aufgrund der erfindungsgemässen Rekalibrierung für zumindest eine weitere Kokillenreise eingesetzt werden.The method according to the invention makes it possible to provide a conical mold with an opposite conicity, i.e. the original strand exit side of the used mold becomes the pouring side of the recalibrated mold, whereby the remaining errors mentioned in the former bath level area reach the area of the new strand exit end. In contrast to the bath level area, these defects have no negative influence on the solidification behavior of the strand, since a strand skin has already formed in this area of the mold, liquid steel no longer has access to the mold wall and can therefore no longer penetrate into the cracks. Surface defects on the solidified strand or strand breakthroughs in the mold can thus be avoided. A mold tube, which previously had to be scrapped, can be used for at least one further mold trip due to the recalibration according to the invention.

Für viele Anwendungsfälle kann es von Vorteil sein, wenn der Querschnitt der ursprünglichen Strangaustrittseite der Kokille zum leichteren Einführen des Dornes aufgeweitet wird. Dies geschieht günstigerweise durch Sprengverformung, wobei vorteilhafterweise Sprengladungen in den vier Eckbereichen des Formhohlraumes und gleichzeitig im wesentlichen in den Mittenbereichen der Aussenseite des Kokillenrohres gezündet werden.For many applications it can be advantageous if the cross section of the original strand exit side of the mold is widened to make it easier to insert the mandrel becomes. This is conveniently done by explosive deformation, advantageously explosive charges being detonated in the four corner areas of the mold cavity and at the same time essentially in the central areas of the outside of the mold tube.

Durch ein derartiges Aufweiten des im Querschnitt kleineren Rohrendes vor der Rekalibrierung kann auch bei im Badspiegelbereich sehr stark eingezogenen Kokillenrohren der Kaliberdorn mühelos eingeführt werden. Durch das Anbringen der Sprengladungen wird eine allseits gleichmässiqe Querschnittvergrösserung erzielt. Hierdurch werden auch Kokillenrohre, die aufgrund der beschriebenen Einziehungen und der damit verbundenen untolerierbaren Konizitätsveränderungen herkömmlicherweise nicht mehr einsetzbar bzw. zu erneuern waren, einer Rekalibrierung und damit einem neuen Gebrauch zugeführt.By widening the tube end with a smaller cross section before recalibration, the caliber mandrel can be inserted easily even in the case of mold tubes that are very strongly drawn in the bath level area. By attaching the explosive charges, a uniform cross-sectional enlargement is achieved on all sides. As a result, mold tubes, which due to the described indentations and the associated intolerable changes in conicity could no longer be used or renewed, are also recalibrated and thus used again.

Im folgenden wird die Erfindung anhand einer schematisch dargestellten Zeichnung im Schnitt näher erläutert:

  • Die Figur zeigt ein verschlissenes, quadratisches Kokillenrohr 1 aus einer Kupferlegierung für eine Stahlstranggiessanlage zu einem Zeitpunkt nach Einbringung eines Kaliberdornes 2 in den Formhohlraum des Kokillenrohres 1. Sowohl Kokillenrohr 1 als auch Dorn 2 haben eine konische Form, wobei die Konizitäten, wie dargestellt, teilweise gegeneinander verlaufen. Mit 3 und 4 sind die Kantenlängen der gedachten Kokillenstirnfläche eines Bereiches 8 des ursprünglichen Strangaustrittes bzw. des Kaliberdornfusses bezeichnet, mit 6 und 5 diejenigen eines Bereiches 9 der ursprünglichen Eingiessseite bzw. der Kaliberdornspitze. Im Badspiegelbereich der ehemaligen Eingiessseite 9 sind irreparable Oberflächenfehler der inneren Rohrwand mit Bezugszeichen 13 versehen. Wenn der Dorn 2 mit seiner Spitze nicht
vom ursprünglichen Strangaustrittsende 8 des Kokillenrohres 1 her eingeführt werden kann, muss deren Querschnitt aufgeweitet werden. Diese Querschnittserweiterung kann mittels hydraulischer oder anderer Kraftgeräte durchgeführt werden. In vielen Fällen bietet sich die Sprengverformung als vorteilhaftes Verfahren an. Hierbei werden in den Eckbereichen des Formhohlraumes entlang weniger Zentimeter und zur Erhaltung der quadratischen Form auch an den Mitten der Aussenseiten des Kokillenrohres 1 gleichzeitig Sprengladungen gezündet.In the following, the invention is explained in more detail on the basis of a schematically represented drawing:
  • The figure shows a worn, square mold tube 1 made of a copper alloy for a continuous steel casting system at a time after the insertion of a caliber mandrel 2 into the mold cavity of the mold tube 1. Both the mold tube 1 and the mandrel 2 have a conical shape, the conicity, as shown, partially run against each other. 3 and 4 denote the edge lengths of the imaginary mold end face of an area 8 of the original strand outlet or the caliber mandrel foot, 6 and 5 those of an area 9 of the original pouring side or the caliber mandrel tip. In the bath level area of the former pouring side 9, irreparable surface defects of the inner tube wall are provided with reference number 13. If the mandrel 2 with its tip is not
can be introduced from the original strand exit end 8 of the mold tube 1, the cross section must be widened. This cross-sectional expansion can be carried out by means of hydraulic or other power devices. In many cases, explosive deformation is an advantageous method. At the same time, explosive charges are detonated in the corner regions of the mold cavity along a few centimeters and, to maintain the square shape, also on the middle of the outer sides of the mold tube 1.

Die Einbringung des Kaliberdornes 2 erfolgt in Pfeilrichtung 7, wobei der strichliert dargestellte Rohrteil 10 entsprechend der Form des Kaliberdornes 2 weiter aufgeweitet wird. Die dem Rohrteil 10 solcherart aufgezwungene Verformung ist teilweise plastischer, teilweise elastischer Natur. Zwischen Dornspitze 6 und den Kokillenwänden der ursprünglichen Eingiessseite 9 entsteht aufgrund der gegeneinander orientierten Konizitäten ein Luftspalt 11, der je nach Form des Kaliberdornes 2 bis zu einigen Millimetern betragen kann.The caliber mandrel 2 is introduced in the direction of the arrow 7, the tube part 10 shown in broken lines being expanded further in accordance with the shape of the caliber mandrel 2. The deformation imposed on the tubular part 10 in this way is partly plastic, partly elastic. Between the mandrel tip 6 and the mold walls of the original pouring side 9, an air gap 11 is created due to the conicity oriented towards one another, which can be up to a few millimeters depending on the shape of the caliber mandrel 2.

Gemäss dem in der DE-AS 25 33 528 beschriebenen Verfahren, werden anschliessend die Kokillenrohrenden mittels nichtdargestellter Bodenplatten verschlossen, an den Rohraussenseiten 12 Sprengladungen angebracht, Kokillenrohr 1 und Dorn 2 als Einheit in einen mit Wasser gefüllten Behälter gestellt und die Ladungen elektrisch gezündet. Hierdurch wird das Kokillenrohr 1 plastisch-mit ihren Innenabmessungen auf die Aussenmasse des Dornes 2, dem Sollmass, verformt. Die ursprüngliche Konizität des Kokillenrohres wird dadurch umgekehrt. Auf diese Weise gelangt gesundes, rissfreies Rohrmaterial in den neuen Badspiegelbereich, während die vorhandenen Oberflächenfehler 13 in den Bereich des neuen Strangaustrittes, in welchem sie keinen negativen Einfluss auf die Strangqualität ausüben können, verlagert werden.According to the method described in DE-AS 25 33 528, the mold tube ends are then closed by means of base plates (not shown), 12 explosive charges are attached to the outside of the tube, mold tube 1 and mandrel 2 are placed as a unit in a container filled with water and the charges are electrically ignited. As a result, the mold tube 1 is plastically deformed with its inner dimensions onto the outer dimension of the mandrel 2, the nominal dimension. This reverses the original taper of the mold tube. In this way, healthy, crack-free pipe material gets into the new bath level area, while the existing surface defects 13 in the area of the new strand outlet, in which they have no negative E influss can exert on the slab quality, be relocated.

Selbstverständlich können mit den oben beschriebenen Verfahren auch Kokillenrohre mit allen anderen Querschnitts-und Konusformen sowie auch gerade Kokillenrohre rekalibriert werden.Of course, the above-described methods can also be used to recalibrate mold tubes with all other cross-sectional and cone shapes, and also mold tubes.

Claims (4)

1. Verfahren zum Rekalibrieren eines verschlissenen, konischen, insbesondere gebogenen Kokillenrohres (1) für das Stranggiessen, wobei ein Kaliberdorn (2) in den Kokillenhohlraum eingeführt, Sprengstoff auf der Rohraussenseite angebracht und durch dessen Detonation der Formhohlraum auf die Abmessung des Kaliberdornes (2) verformt wird, dadurch gekennzeichnet, dass für konische Kokillenrohre (1) der konisch ausgebildete Kaliberdorn (2) mit seiner kleineren Stirnfläche von der ursprünglichen Strangaustrittseite (8) des Kokillenrohres (1) her eingeführt und diese Strangaustrittseite (8) mittels der Explosivkraft zur Eingiessseite verformt wird.1. A method for recalibrating a worn, conical, in particular bent, mold tube (1) for continuous casting, wherein a caliber mandrel (2) is inserted into the mold cavity, explosives are attached to the outside of the tube, and the mold cavity is detonated to the dimension of the caliber mandrel (2). is deformed, characterized in that for conical mold tubes (1) the conical mandrel (2) with its smaller end face is introduced from the original strand outlet side (8) of the mold tube (1) and this strand outlet side (8) is deformed to the pouring side by means of the explosive force becomes. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Querschnitt der ursprünglichen Strangaustrittseite (8) des Kokillenrohres (1) zum leichteren Einführen des Dornes (2) aufgeweitet wird.2. The method according to claim 1, characterized in that the cross section of the original strand exit side (8) of the mold tube (1) is widened for easier insertion of the mandrel (2). 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Querschnitt durch Sprengverformung aufgeweitet wird.3. The method according to claim 2, characterized in that the cross section is expanded by explosive deformation. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass Sprengladungen in den vier Eckbereichen des Formhohlraumes und gleichzeitig im wesentlichen in den Mittenbereichen der Aussenseite (12) des Kokillenrohres (1) gezündet werden.4. The method according to claim 3, characterized in that explosive charges are detonated in the four corner regions of the mold cavity and at the same time essentially in the central regions of the outside (12) of the mold tube (1).
EP80104173A 1979-07-20 1980-07-17 Method of recalibrating a worn conical tube, especially a curved tubular mould for continuous casting Expired EP0023034B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104173T ATE2654T1 (en) 1979-07-20 1980-07-17 PROCESS FOR RECALIBRATION OF A WORN, CONICAL, ESPECIALLY CURVED MOLD TUBE FOR CONTINUOUS CASTING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH676879A CH638411A5 (en) 1979-07-20 1979-07-20 METHOD FOR DEFORMING A WEARED, CONICAL, IN PARTICULAR BENT, CHILLER TUBE.
CH6768/79 1979-07-20

Publications (2)

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EP0023034A1 true EP0023034A1 (en) 1981-01-28
EP0023034B1 EP0023034B1 (en) 1983-03-02

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EP80104173A Expired EP0023034B1 (en) 1979-07-20 1980-07-17 Method of recalibrating a worn conical tube, especially a curved tubular mould for continuous casting

Country Status (8)

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US (1) US4457151A (en)
EP (1) EP0023034B1 (en)
JP (1) JPS5617123A (en)
AT (1) ATE2654T1 (en)
BR (1) BR8004441A (en)
CA (1) CA1166423A (en)
CH (1) CH638411A5 (en)
DE (1) DE3062204D1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP1317979A1 (en) * 2001-12-07 2003-06-11 KM Europa Metal Aktiengesellschaft Method for calibrating a casting mould by explosive reforming

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211440C2 (en) * 1982-03-27 1984-04-26 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Method for producing a continuous casting mold with a mold tube made of copper or a copper alloy and provided with at least one flange
CH670656A5 (en) * 1987-04-14 1989-06-30 Fischer Ag Georg
DE19834394A1 (en) * 1998-07-30 2000-02-03 Rheinmetall W & M Gmbh Gun barrel with a wear-reducing hard chrome layer
CN103480810B (en) * 2013-10-11 2015-07-29 重庆大学 A kind of H parison continuous cast mold inner cavity taper defining method

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Publication number Priority date Publication date Assignee Title
DE2452573A1 (en) * 1973-11-06 1975-05-07 Lorne Russell Shrum METHOD OF MANUFACTURING A TUBE-SHAPED COPPER MOLD FOR CONTINUOUS METAL CASTING
DE2533528B2 (en) * 1974-07-29 1976-09-02 Concast Inc., New York, N.Y. (V.St.A.) PROCESS FOR DEFORMING WALLS FOR CONTINUOUS CASTING CHILLES AND CHILLINGS
US4081983A (en) * 1977-03-29 1978-04-04 Lorne Russell Shrum Molds for the continuous casting of metals

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US3646799A (en) * 1969-12-15 1972-03-07 Kabel Und Metalwerke Gutchoffn Method of making molds for continuous casting machines

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2452573A1 (en) * 1973-11-06 1975-05-07 Lorne Russell Shrum METHOD OF MANUFACTURING A TUBE-SHAPED COPPER MOLD FOR CONTINUOUS METAL CASTING
DE2533528B2 (en) * 1974-07-29 1976-09-02 Concast Inc., New York, N.Y. (V.St.A.) PROCESS FOR DEFORMING WALLS FOR CONTINUOUS CASTING CHILLES AND CHILLINGS
US4081983A (en) * 1977-03-29 1978-04-04 Lorne Russell Shrum Molds for the continuous casting of metals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1317979A1 (en) * 2001-12-07 2003-06-11 KM Europa Metal Aktiengesellschaft Method for calibrating a casting mould by explosive reforming

Also Published As

Publication number Publication date
ATE2654T1 (en) 1983-03-15
DE3062204D1 (en) 1983-04-07
CA1166423A (en) 1984-05-01
CH638411A5 (en) 1983-09-30
US4457151A (en) 1984-07-03
EP0023034B1 (en) 1983-03-02
JPS626899B2 (en) 1987-02-14
JPS5617123A (en) 1981-02-18
BR8004441A (en) 1981-01-27

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