EP0543092B1 - Method for repairing a mold for continuous casting of steel - Google Patents

Method for repairing a mold for continuous casting of steel Download PDF

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Publication number
EP0543092B1
EP0543092B1 EP92114442A EP92114442A EP0543092B1 EP 0543092 B1 EP0543092 B1 EP 0543092B1 EP 92114442 A EP92114442 A EP 92114442A EP 92114442 A EP92114442 A EP 92114442A EP 0543092 B1 EP0543092 B1 EP 0543092B1
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Prior art keywords
mould
copper
wear
mold
mandrel
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92114442A
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German (de)
French (fr)
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EP0543092A1 (en
Inventor
Egon Evertz
Rolf Prof.Dr.-Ing. Deybold
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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

Definitions

  • the invention relates to a method for working up one-piece copper molds which have become unusable due to wear and tear for the continuous casting of steel, the inner sides being removed mechanically to the depth of wear.
  • One-piece copper molds of this type generally have a rectangular inner cross section, which decreases in the direction of flow, corresponding to the decreasing volume of the steel that is solidifying. Furthermore, they are curved in their longitudinal direction. In this respect, they are considered to be geometrically complicated, which requires a corresponding manufacturing outlay. Therefore, it is usually economical to repair worn molds as far as the state of wear permits. Of course, a repair procedure must also take the geometric conditions into account. It is therefore customary to mechanically process the molds on the inside by removal, the removal having to extend to the depth of the wear. As a result, however, the mold is then thinner than before, so that ultimately falling below the wall thickness required for thermal and strength reasons places limits on the repair options. An ablation process in which the mold taper is reversed is ultimately subject to these restrictions.
  • the object of the invention is to further develop the known method in such a way that the mold can be restored to its original state. So you should not only have the original internal dimensions, but also be unchanged on the outside, so that the strength and the cooling effect are unchanged. If necessary, grooves should also run in the outer wall, which are required for the sealing connection to a coolant system.
  • this object is achieved in that, according to the characterizing part of patent claim 1 A combination of different features is selected, the application of which leads to a repaired mold that matches the original dimensions.
  • the extent of the deformation provided according to the invention is evident from the fact that the mold after the inventive treatment is longer than before. It is therefore finally shortened to its specified length.
  • the extent of the longitudinal section can be concluded from the deformation that has occurred.
  • the copper applied to the outer sides of the mold is generally chosen to be approximately twice the volume as it was removed on the inside in accordance with the internal wear. Precise specifications for this depend on the size of the molds from. You can easily determine them empirically.
  • the elongation of the mold described above by the treatment according to the invention is not only important as a control measure for the deformation that has occurred, but also has a constructive meaning in the case of molds with groove tracks provided on the outer edge for the connection of cooling devices. These groove tracks would not be retained by the measures proposed according to the invention in detail.
  • the part which extends beyond the stated dimension is cut off after the shaping, whereupon the groove tracks can finally be introduced again in the edge zones in a further process cut.
  • the invention proves itself very well when it is important on the one hand to create a mechanically and thermally highly resilient forming structure and on the other hand to be able to restore the groove tracks in the result in the type of forming.
  • the mold 6 shown in FIG. 1 is curved in its longitudinal direction, as shown in particular by the longitudinal axis 7. Accordingly, their internal dimensions 2 are curved on the one hand and on the other hand in the exit direction still conical.
  • a new internal dimension 3 is achieved, which is initially still above the intended value.
  • the mold 6 undergoes an external treatment, which consists in the application of copper.
  • the original outer dimension 1 becomes larger due to the treatment, so that the new outer dimension 4 results.
  • the mold treated with these values of the internal and external dimensions is treated with an internal mandrel and a drawing nozzle, as taught by the proposal of the invention. Such methods are known as such and do not form the subject of the invention.
  • DE-OS 39 08 977.0 deals with such a reshaping.
  • the increase in length 5, as illustrated in the lower part of FIG. 3, is interesting in the sense of the present invention. This length must be cut off in order to regain the initial shape of the mold. After the mechanical removal of the increase in length, the mold not only assumed the original values in terms of its length, but also in terms of its internal dimension 2 and its external dimension 1.
  • Figure 4 shows a mold corresponding to Figure 1 with an upper circumferential groove 10, which serves for the sealing connection to a coolant system.
  • This groove 10 presupposes a length section 9, the extension of which in the longitudinal direction of the mold must be obtained as a longitudinal expansion in the treatment according to the invention, in order to have the initial shape available again after mechanical incorporation of a new groove 10.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to the repair of one-piece copper moulds 6 for the continuous casting of steel which have become unusable due to wear. The removal of the inner sides to the depth of the wear is known. However, as a result the mould (6) becomes thinner than before until, finally, it can no longer be used for thermal reasons and for reasons of strength. The invention restores all the original dimensions of the mould 6 by a process in which, first of all, the outer sides of the mould are coated with copper, a mandrel defining the inside dimension 2 of the mould 6 is inserted into the mould 6 and the latter is then drawn through a die so that its inner side rests against the mandrel and its length increases 5, the inside dimension 2 and the outside dimension 1 corresponding to the original dimensions. The mould is then shortened in length, thus reestablishing the length dimension as well. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zur Aufarbeitung von durch Verschleiß unbrauchbar gewordenen, einteiligen Kupferkokillen für das Stranggießen von Stahl, wobei die Innenseiten mechanisch bis zur Tiefe des Verschleißes abgetragen werden.The invention relates to a method for working up one-piece copper molds which have become unusable due to wear and tear for the continuous casting of steel, the inner sides being removed mechanically to the depth of wear.

Einteilige Kupferkokillen dieser Gattung haben in der Regel einen rechteckigen Innenquerschnitt, der sich in Durchflußrichtung verkleinert, entsprechend dem kleiner werdenden Volumen des in Erstarrung befindlichen Stahls. Weiterhin sind sie in ihrer Längsrichtung gekrümmt. Sie gelten insoweit als geometrisch kompliziert, was einen entsprechenden Herstellungsaufwand bedingt. Daher ist es meistens wirtschaftlich, verschlissene Kokillen wieder instandzusetzen, soweit der Verschleißzustand es zuläßt. Selbstverständlich muß ein Instandsetzungsverfahren den geometrischen Verhältnissen, gleichfalls Rechnung tragen. Üblich ist daher, die Kokillen innenseitig durch Abtragung mechanisch zu bearbeiten, wobei die Abtragung bis zur Tiefe des Verschleisses reichen muß. Im Ergebnis ist die Kokille dann aber dünner als vorher, so daß schließlich ein Unterschreiten der aus thermischen Gründen und Festigkeitsgründen erforderlichen Wandstärke den Instandsetzungsmöglichkeiten Grenzen setzt. Auch ein Abtragungsverfahren, bei welchem die Kokillen-Konizität umgekehrt wird, ist letztlich diesen Einschränkungen unterworfen.One-piece copper molds of this type generally have a rectangular inner cross section, which decreases in the direction of flow, corresponding to the decreasing volume of the steel that is solidifying. Furthermore, they are curved in their longitudinal direction. In this respect, they are considered to be geometrically complicated, which requires a corresponding manufacturing outlay. Therefore, it is usually economical to repair worn molds as far as the state of wear permits. Of course, a repair procedure must also take the geometric conditions into account. It is therefore customary to mechanically process the molds on the inside by removal, the removal having to extend to the depth of the wear. As a result, however, the mold is then thinner than before, so that ultimately falling below the wall thickness required for thermal and strength reasons places limits on the repair options. An ablation process in which the mold taper is reversed is ultimately subject to these restrictions.

Aus der DE-A-3 231 444 ist ein Verfahren zum Ausbessern einer Stranggießkokille bekannt geworden, bei dem Verschleißschichten zum teil entfernt werden und nach Aktivierung der freigelegten Oberfläche mittels Säure, diese mit einer neuen Schicht aus Nickel oder Nickellegierung überzogen wird.From DE-A-3 231 444 a method for repairing a continuous casting mold has become known, in which wear layers are partially removed and after activation of the exposed surface with acid, this is coated with a new layer of nickel or nickel alloy.

Von diesem Stand der Technik ausgehend liegt der Erfindung die Aufgabenstellung zu Grunde, das bekannte Verfahren dahingehend weiterzuentwickeln, daß die Kokille in ihren Ausgangszustand wiederhergestellt werden kann. Sie soll also nicht nur das ursprüngliche Innenmaß aufweisen, sondern auch außen unverändert sein, so daß die Festigkeit und die Kühlwirkung unverändert sind. Gegebenenfalls sollen auch in der Außenwandung Nuten verlaufen, die zum dichtenden Anschluß an ein Kühlmittelsystem erforderlich sind.Starting from this prior art, the object of the invention is to further develop the known method in such a way that the mold can be restored to its original state. So you should not only have the original internal dimensions, but also be unchanged on the outside, so that the strength and the cooling effect are unchanged. If necessary, grooves should also run in the outer wall, which are required for the sealing connection to a coolant system.

Erfindungsgemäß wird diese Aufgabenstellung dadurch gelöst, daß entsprechend dem Kennzeichnungsteil des Patentanspruchs 1 eine Kombination verschiedener Merkmale gewählt wird, deren Anwendung zu einer mit den Ursprungsmaßen übereinstimmenden, instandgesetzten Kokille führt.According to the invention, this object is achieved in that, according to the characterizing part of patent claim 1 A combination of different features is selected, the application of which leads to a repaired mold that matches the original dimensions.

Im einzelnen führt die Aufbringung von Kupfer auf die Außenseiten der Kokille im Anschluß an die vorausgegangene, innere Abtragung des Verschleisses zwar schon dazu, daß eine Zunahme der Wandstärke eintritt. Dies ist jedoch zunächst noch nicht befriedigend, denn sowohl das Innenmaß als auch das Außenmaß werden größer, so daß das Stranggußmaß nicht mehr eingehalten werden kann und die Kühleinrichtungen nicht mehr zur Kokille passen, weil sie für eine dichtende Anlage an ein kleineres Kokillenaußenmaß gestaltet sind. Hinzu kommt, daß das normalerweise galvanisch aufgebrachte Kupfer noch eine sehr lockere Gefügestruktur besitzt, vergleichbar etwa mit einem Gußgefügezustand. Die weiterhin vorgeschlagene ziehtechnische Verarbeitung mit einem innenseitigen Dorn und einer außen angreifenden Düse führt nun, gegebenenfalls in mehreren Durchgängen, zunächst zu einer relativ feinkörnigen Struktur, darüber hinaus aber vor allem zu einer Einhaltung der Maße, wie sie bei einer neuen Kokille vorgesehen sind. Damit wären die Festigkeitseigenschaften und vor allem thermische Eigenschaften verwirklicht, wie sie sich sonst nur bei einer neuen Kokille erreichen lassen. Für das Stranggießverfahren ist die Einhaltung der Maßbedingungen und Festigkeitseigenschaften von besonders großer Bedeutung, weil nur auf diese Weise die Stranggießverfahren mit reproduzierbaren Parametern verwirklicht werden kann.Specifically, the application of copper to the outside of the mold following the previous internal removal of the wear already leads to an increase in the wall thickness. However, this is not yet satisfactory at first, because both the internal dimension and the external dimension become larger, so that the continuous casting dimension can no longer be maintained and the cooling devices no longer match the mold, because they are designed for a sealing system on a smaller mold external dimension. In addition, the normally electroplated copper has a very loose structure, comparable to a cast structure. The further proposed drawing processing with an internal mandrel and an externally attacking nozzle now leads, possibly in several passes, initially to a relatively fine-grained structure, but moreover to compliance with the dimensions provided for a new mold. This would result in the strength properties and above all thermal properties that would otherwise only be achieved with a new mold. Compliance with the dimensional conditions and strength properties is of particular importance for the continuous casting process, because only in this way can the continuous casting process be implemented with reproducible parameters.

Das Ausmaß der erfindungsgemäß vorgesehenen Umformung wird daran deutlich, daß die Kokille nach der erfinderischen Behandlung länger ist als vorher. Sie wird daher abschließend auf ihr vorgegebenes Längenmaß gekürzt. Vom Ausmaß des Längenabschnittes kann auf die eingetretene Umformung geschlossen werden. In der Regel wird, um dies sicherzustellen, das auf die Außenseiten der Kokille aufgebrachte Kupfer von etwa dem doppelten Volumen gewählt, wie es entsprechend dem inneren Verschleiß auf der Innenseite abgetragen wurde. Genaue Vorgaben hierfür hängen von der Größe der Kokillen ab. Man kann sie sehr leicht in empirischer ermitteln.The extent of the deformation provided according to the invention is evident from the fact that the mold after the inventive treatment is longer than before. It is therefore finally shortened to its specified length. The extent of the longitudinal section can be concluded from the deformation that has occurred. In order to ensure this, the copper applied to the outer sides of the mold is generally chosen to be approximately twice the volume as it was removed on the inside in accordance with the internal wear. Precise specifications for this depend on the size of the molds from. You can easily determine them empirically.

Die vorstehend beschriebene Längung der Kokille durch die erfindungsgemäße Behandlung hat jedoch nicht nur als Kontrollmaß für die aufgetretene Umformung Bedeutung, sondern darüber hinaus auch einen konstruktiven Sinn bei Kokillen mit am Außenrand vorgesehenen Nutbahnen für den Anschluß von Abkühlungseinrichtungen. Diese Nutbahnen würden sich durch die im einzelnen vorgeschlagenen, erfindungsgemäßen Maßnahmen nicht beibehalten lassen. Hingegen ist es möglich, die umzuformende Masse so zu wählen, daß die Kokillenlängung in einem Ausmaß stattfindet, welches über die ursprüngliche Randzone mit darin eingelassenen Nutbahnen hinausgeht. Bei einer derartig behandelten Kokille wird der über das genannte Maß hinausreichende Teil nach der Umformung abgeschnitten, woraufhin abschließend wieder in einem weiteren Verfahrensschnitt die Nutbahnen in den Randzonen wieder eingebracht werden können.The elongation of the mold described above by the treatment according to the invention is not only important as a control measure for the deformation that has occurred, but also has a constructive meaning in the case of molds with groove tracks provided on the outer edge for the connection of cooling devices. These groove tracks would not be retained by the measures proposed according to the invention in detail. On the other hand, it is possible to choose the mass to be reshaped in such a way that the mold elongation takes place to an extent which extends beyond the original edge zone with the groove tracks embedded therein. In the case of a mold treated in this way, the part which extends beyond the stated dimension is cut off after the shaping, whereupon the groove tracks can finally be introduced again in the edge zones in a further process cut.

Auf diese Weise bewährt sich die Erfindung sehr gut, wenn es darauf ankommt, einerseits ein mechanisch und thermisch hoch belastbares Umformgefüge zu schaffen, und andererseits die Nutbahnen bei der Art der Umformung im Ergebnis wiederherstellen zu können.In this way, the invention proves itself very well when it is important on the one hand to create a mechanically and thermally highly resilient forming structure and on the other hand to be able to restore the groove tracks in the result in the type of forming.

Zur weiteren Veranschaulichung der Erfindung wird auf die Zeichnungen Bezug genommen. Darin zeigen:

Figur 1
einen Längsschnitt durch eine erfindungsgemäß instandzusetzende Stranggießkokille,
Figur 2
einen Länngsschnitt entsprechend Figur 1 in teilweise instandgesetztem Zustand,
Figur 3
einen Längsschnitt gemäß Figur 1 in weitergehend instandgesetztem Zustand, vor Kürzung der Längenzunahme, und
Figur 4
einen Längsschnitt bei einer Kokille mit einer Nutbahn.
To further illustrate the invention, reference is made to the drawings. In it show:
Figure 1
a longitudinal section through a continuous casting mold to be repaired according to the invention,
Figure 2
2 shows a longitudinal section corresponding to FIG. 1 in a partially repaired state,
Figure 3
2 shows a longitudinal section according to FIG. 1 in a largely repaired state, before the length increase has been reduced, and
Figure 4
a longitudinal section in a mold with a groove.

Die in Figur 1 wiedergegebene Kokille 6 ist in ihrer Längsrichtung gekrümmt, wie insbesondere die Längsachse 7 zeigt. Entsprechend sind ihre Innenmaße 2 einerseits gekrümmt und andererseits in Austrittsrichtung noch konisch ausgeführt. Durch die Abarbeitung des Innenmaßes 2 wird ein neues Innenmaß 3 erreicht, welches zunächst noch über dem vorgesehenen Wert liegt. In diesem Zustand erfährt die Kokille 6 eine Außenbehandlung, die in der Auftragung von Kupfer besteht. Das ursprüngliche Außenmaß 1 wird durch die Behandlung größer, so daß sich das neue Außenmaß 4 ergibt. Die mit diesen Werten des Innen- und Außenmasses behandelte Kokille erfährt eine Behandlung mit einem Innendorn und einer Ziehdüse, wie es der Vorschlag der Erfindung lehrt. Derartige Verfahren sind als solche bekannt und bilden nicht den Gegenstand der Erfindung. Beispielsweise befaßt sich die DE-OS 39 08 977.0 mit einer derartigen Umformung. Interessant im Sinne der vorliegenden Erfindung ist die Längenzunahme 5, wie sie im unteren Teil der Figur 3 veranschaulicht ist. Dieses Längenmaß muß, um die Ausgangsform der Kokille wiederzuerlangen, abgetrennt werden. Nach dem mechanischen Abtragen der Längenzunahme hat die Kokille nicht nur in ihrer Länge, sondern auch in ihrem Innenmaß 2 und in ihrem Außenmaß 1 die ursprünglichen Werte angenommen.The mold 6 shown in FIG. 1 is curved in its longitudinal direction, as shown in particular by the longitudinal axis 7. Accordingly, their internal dimensions 2 are curved on the one hand and on the other hand in the exit direction still conical. By processing the internal dimension 2, a new internal dimension 3 is achieved, which is initially still above the intended value. In this state, the mold 6 undergoes an external treatment, which consists in the application of copper. The original outer dimension 1 becomes larger due to the treatment, so that the new outer dimension 4 results. The mold treated with these values of the internal and external dimensions is treated with an internal mandrel and a drawing nozzle, as taught by the proposal of the invention. Such methods are known as such and do not form the subject of the invention. For example, DE-OS 39 08 977.0 deals with such a reshaping. The increase in length 5, as illustrated in the lower part of FIG. 3, is interesting in the sense of the present invention. This length must be cut off in order to regain the initial shape of the mold. After the mechanical removal of the increase in length, the mold not only assumed the original values in terms of its length, but also in terms of its internal dimension 2 and its external dimension 1.

Figur 4 zeigt eine Kokille entsprechend Figur 1 mit einer oberen Umfangsnut 10, die dem dichtenden Anschluß an ein Kühlmittelsystem dient. Diese Nut 10 setzt einen Längenabschnitt 9 voraus, dessen Erstreckung in der Längsrichtung der Kokille bei der erfindungsgemäßen Behandlung als Längendehnung erhalten werden muß, um nach mechanischer Einarbeitung einer neuen Nut 10 wieder die Ausgangsform zur Verfügung zu haben.Figure 4 shows a mold corresponding to Figure 1 with an upper circumferential groove 10, which serves for the sealing connection to a coolant system. This groove 10 presupposes a length section 9, the extension of which in the longitudinal direction of the mold must be obtained as a longitudinal expansion in the treatment according to the invention, in order to have the initial shape available again after mechanical incorporation of a new groove 10.

Claims (4)

  1. Method for reprocessing one-piece copper moulds for the continuous casting of steel that have become unusable due to wear, whereby material is removed mechanically from the inner sides up to the depth of wear,
    characterized in that
       copper is deposited on the outer sides of the mould,
       and that a mandrel determining the inner dimensions of the mould is inserted into the mould,
       and that the mould and mandrel are drawn through a nozzle destined to reduce the outer dimension of the mould in such a manner that the mould inner side contacts with the mandrel and the mould increases in length,
       and that the mould is subsequently shortened to a predetermined length.
  2. Method according to Claim 1,
    characterized in that
       the copper deposited galvanically on the outer sides of the mould is precipitated to approximately double the volume that was removed commensurate with the internal wear.
  3. Method according to Claim 1 for moulds designed with outer grooves to provide a sealing connection with coolant devices,
    characterized in that
       the copper is deposited on the outer sides of the mould to ensure that the lengthening occurring during the subsequent drawing operation extends beyond the grooved end zone,
    and that, subsequent to this, new grooves are recessed into the end zone.
  4. Method according to Claims 1 to 3,
    characterized in that
       the subsequent shortening of the mould is performed mechanically.
EP92114442A 1991-08-27 1992-08-25 Method for repairing a mold for continuous casting of steel Expired - Lifetime EP0543092B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4128365A DE4128365A1 (en) 1991-08-27 1991-08-27 METHOD FOR REFURBISHING COPPER CHILLS FOR STEEL CASTING
DE4128365 1991-08-27

Publications (2)

Publication Number Publication Date
EP0543092A1 EP0543092A1 (en) 1993-05-26
EP0543092B1 true EP0543092B1 (en) 1996-06-12

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Application Number Title Priority Date Filing Date
EP92114442A Expired - Lifetime EP0543092B1 (en) 1991-08-27 1992-08-25 Method for repairing a mold for continuous casting of steel

Country Status (4)

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EP (1) EP0543092B1 (en)
AT (1) ATE139159T1 (en)
DE (2) DE4128365A1 (en)
ES (1) ES2090429T3 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3012490C2 (en) * 1980-03-31 1984-05-10 Goetze Ag, 5093 Burscheid Device for electroplating the outer surface of cylindrical workpieces
JPS5838637A (en) * 1981-09-01 1983-03-07 Nippon Steel Corp Repairing method for mold for continuous casting
DE3313503A1 (en) * 1983-04-14 1984-10-18 Evertz, Egon, 5650 Solingen ONE-PIECE CONTINUOUS CASTING CHOCOLATE AND METHOD FOR THEIR PRODUCTION
FI71243C (en) * 1984-06-27 1986-12-19 Outokumpu Oy FOERFARANDE OCH ANORDNING FOER FRAMSTAELLNING AV KOPPAR- ELLERKOPPARLEGERINGSROER BILDADE KOKILLER FOER STRAENGGJUTNING SMSKINER FOER ETT AEMNE
FI852493L (en) * 1985-06-24 1986-12-25 Outokumpu Oy KOKILL.
DE3908977C2 (en) * 1989-03-18 1995-09-07 Egon Evertz Device for deforming tubular, arcuate tubular bodies

Also Published As

Publication number Publication date
DE59206552D1 (en) 1996-07-18
ATE139159T1 (en) 1996-06-15
EP0543092A1 (en) 1993-05-26
DE4128365A1 (en) 1993-03-04
ES2090429T3 (en) 1996-10-16

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