EP0892073B1 - Funnel-shaped mould with a liner tube for the electroslag remelting as well a process therefor - Google Patents
Funnel-shaped mould with a liner tube for the electroslag remelting as well a process therefor Download PDFInfo
- Publication number
- EP0892073B1 EP0892073B1 EP98110287A EP98110287A EP0892073B1 EP 0892073 B1 EP0892073 B1 EP 0892073B1 EP 98110287 A EP98110287 A EP 98110287A EP 98110287 A EP98110287 A EP 98110287A EP 0892073 B1 EP0892073 B1 EP 0892073B1
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- EP
- European Patent Office
- Prior art keywords
- ring
- graphite electrode
- tube
- funnel
- insert tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
- B22D11/0401—Moulds provided with a feed head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
- B22D23/10—Electroslag casting
Definitions
- the invention relates to a funnel mold with a funnel-shaped Insert tube for electroslag remelting at least a melting electrode - especially one Steel electrode in special metallurgy - according to the generic term of claim 1.
- the invention covers a Process for electroslag remelting.
- ESU chillers with water-cooled tube-like copper insert known in one Jacket pipe with corresponding connections for cooling water is housed; in the casing tube or in the copper insert Cooling channels are provided, which serve the cooling water accordingly the shape of the mold and the necessary cooling water speed spread over the circumference of the mold.
- the copper insert can have different shapes that different consumable electrodes form block formats different cross-section can be remelted.
- a mold used in practice is the so-called. Funnel mold, which is the remelting of electrodes with a large diameter to blocks with a smaller one Diameter allows.
- Such a mold for remelting electroslag with a melting electrode to one arising in the lower tubular mold area as well from this block to be subtracted down is DE-AS 2 328 804.
- the invention lies in knowledge of this prior art the task of creating an ESC funnel mold, in which the problems mentioned above do not occur; the for safe electrical contact between the non-consumable Electrode and the forwarding current parts necessary forces should be independent of the ones constantly changing thermal conditions good working conditions ensure for the electrode.
- the Graphite electrode is located below the slag bath level and is overlapped by an insulating element that with the graphite electrode limited an approximately annular gap as well by means of a high-current cable to the electrical network connected is.
- it has proven to be cheap Graphite electrode towards the insert tube towards a ceramic insulation ring hang up, being from a water-cooled Contact ring is gripped as an insulating element.
- This ESU funnel mold essentially consists of one - placed in a water jacket - funnel-shaped Copper insert tube, which is preferably cylindrical in the upper part is executed and its lower block forming Part of a round, square or even polygonal May have cross-section.
- the shoulder-shaped Recess in the upper cylindrical part of the insert tube or copper insert takes the ring-shaped graphite electrode to the ceramic insulation tube - preferably a ceramic insulation ring - rests as well as towards the melting electrode towards that water-cooled contact ring assigned.
- the cooling water gap is in the lower part by another O-ring with a much shorter diameter by another O-ring with a much shorter diameter sealed, which - like that other O-ring in the upper Part of the mold - in a groove open to the insert tube located.
- the water-cooled contact ring is advantageously through Stud bolts with a support plate that holds the mold connected so that it encompasses the studs on the one hand Insulation sleeves rests on the other Annular gap between it and the annular graphite electrode remains guaranteed in the rest position.
- the area covered by the upper O-ring is considerably larger is shorter than the corresponding area of the lower O-ring Diameter, arises thanks to the cooling water pressure a force that pushes the insert tube towards the graphite electrode presses and the latter - reducing that annular gap presses the contact ring.
- the electrical current flow is guaranteed; because according to another feature of the invention is the contact ring with a high current cable electrical network connected.
- a funnel mold 10 for so-called electroslag remelting has, according to FIG. 1, an insert tube 12 formed in one piece from copper or a copper alloy, which consists of a cylindrical molded tube 14 - an inside diameter d and an outside diameter d 1 - one of this upwardly conically expanding funnel section 15 and a cylindrical fir ring 16 adjoining its largest diameter e.
- the insert tube 12 is surrounded by a jacket tube 18, which in turn offers a lower tube section 19 and a funnel section 20 molded upwards.
- the opposing pairings of the cylindrical Pipe sections 14, 19 and the funnel sections 15, 20 run at a gap distance a from each other; the so educated Gap 22 is used for cooling water and is sealed at the top by an O-ring 24. This rests in a groove 25 which face between two inwards Radial ribs 26 of a collar ring 28 extends. The latter sets - in gap distance a to fir ring 16 of Insert tube 12 standing - the casing tube 18, so that Gap 22, continues and is attached to a support plate 30, which contains supply and return lines 31, 32 for the cooling water.
- annular graphite electrode 40 In a shoulder recess 36 through one - from that Firstring 16 molded - angle edge 17 offered is supported on a ceramic insulation ring 38 an annular graphite electrode 40. This is from a that angular edge 17 at a distance overlapping contact ring 42 covers that as a hollow profile with water-bearing cooling channel 44 is formed.
- the contact ring 42 is by at 46 indicated studs connected to the support plate 30 so that he on the one hand embrace the stud screws 46 Insulation sleeves 48 rests, on the other hand with the annular graphite electrode 40 forms an annular gap 50.
- the contact ring 42 is through a high current cable 52 connected to an electrical network 54.
- the water-cooled contact ring 42 consists of a copper-containing one Alloy, it is not a problem safe electrical contact between it and the high current cable 52 using any mechanical connection type - such as Screws or the like - to be realized. Because the graphite electrode 40 always remains below the slag level 51 and since they are continuously at the temperature of the melted Slag 56 is heated, the electrical contact on the one hand between slag 56 and graphite electrode 40 and on the other hand between the latter and the contact ring 42 constantly received. By lowering the axial melting electrode 58 the melting electrode melts into the slag 56 58 and drips down through the slag 56.
- a during the melting process in the lower part of the Funnel mold 10 forming ingot or block 60 is at Lowering one of the funnel molds 10 to limit the bottom Platform or bottom plate 62 from the bottom block-forming Pipe section - the shaped tube 14 - the funnel mold 10 pulled out.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Die Erfindung betrifft eine Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen wenigstens einer Abschmelzelektrode -- insbesondere einer Stahlelektrode in der Sondermetallurgie -- nach dem Oberbegriff des Patentanspruchs 1. Zudem erfaßt die Erfindung ein Verfahren zum Elektroschlackeumschmelzen.The invention relates to a funnel mold with a funnel-shaped Insert tube for electroslag remelting at least a melting electrode - especially one Steel electrode in special metallurgy - according to the generic term of claim 1. In addition, the invention covers a Process for electroslag remelting.
Es sind mehrere Arten von sog. ESU-Kokillen mit wassergekühltem rohrartigem Kupfereinsatz bekannt, der in einem Mantelrohr mit entsprechenden Anschlüssen für Kühlwasser untergebracht ist; im Mantelrohr oder im Kupfereinsatz sind Kühlkanäle vorgesehen, die dazu dienen, das Kühlwasser entsprechend der Form der Kokille und der notwendigen Kühlwassergeschwindigkeit über den Kokillenumfang zu verteilen. Der Kupfereinsatz kann verschiedene Formen aufweisen, so daß unterschiedliche Abschmelzelektroden zu Blockformaten verschiedenen Querschnitts umgeschmolzen zu werden vermögen.There are several types of so-called ESU chillers with water-cooled tube-like copper insert known in one Jacket pipe with corresponding connections for cooling water is housed; in the casing tube or in the copper insert Cooling channels are provided, which serve the cooling water accordingly the shape of the mold and the necessary cooling water speed spread over the circumference of the mold. The copper insert can have different shapes that different consumable electrodes form block formats different cross-section can be remelted.
Eine in der Praxis verbreitete Kokillenform ist die sog. Trichterkokille, die das Umschmelzen von Elektroden mit einem großen Durchmesser zu Blöcken mit einem kleineren Durchmesser ermöglicht. Eine solche Kokille zum Elektroschlackeumschmelzen mit einer Abschmelzelektrode zu einem im unteren rohrförmigen Kokillenbereich entstehenden sowie aus diesem nach unten abzuziehenden Block ist der DE-AS 2 328 804 zu entnehmen. Während des Blockaufbaus wird eine Relativbewegung zwischen Block und Kokille aufrechterhalten. Dabei taucht die Abschmelzelektrode in ein Schlackenbad ein, das sich im oberen Bereich der von einem Tragorgan gehaltenen Trichterkokille befindet. A mold used in practice is the so-called. Funnel mold, which is the remelting of electrodes with a large diameter to blocks with a smaller one Diameter allows. Such a mold for remelting electroslag with a melting electrode to one arising in the lower tubular mold area as well from this block to be subtracted down is DE-AS 2 328 804. During block construction, a Maintain relative movement between block and mold. The melting electrode is immersed in a slag bath one that is located in the upper area of a support member held funnel mold is located.
Bei Trichterkokillen ist es erforderlich, den Schmelzstrom direkt aus der Schlacke zurück in das Netz zu führen, da der kleinere Blockdurchmesser nicht die ganze Schmelzstrommenge zurückleiten kann. Da aber die Schlacke, in welcher der Schmelzvorgang stattfindet, nur im flüssigen Zustand stromleitend ist, bleibt ein direkter Stromanschluß an der Kokillenwand unmöglich; durch die Wasserkühlung des Kupfereinsatzes bildet sich an der Innenseite der Kokillenwand eine harte, nicht geschmolzene -- und dadurch nicht stromleitende -- Schlackenschicht. Aus diesem Grunde werden verschiedene zusätzliche Elektroden im Schlackenbad verwendet, die während des Schmelzens heiß genug bleiben, um die Schlacke nicht erstarren zu lassen und dadurch die Stromrückführung von der flüssigen Schlacke in das Netz gewährleisten. Nicht verzehrbare Elektroden dieser Art zeigt US-A-4,145,563 beispielhaft als zur Abschmelzelektrode etwa achsparallele Stabelektroden oder als -- ebenfalls das Schlackenbad überragende -- hohle Zylinderelektroden, die ihre Abschmelzelektrode in Abstand umgeben. Werden für nicht verzehrbare Elektroden Graphitelemente oder Teile aus Graphit-Kupfer-Keramikmischungen eingesetzt, so ergibt sich das Problem, den richtigen elektrischen Kontakt zwischen der Elektrode und einem anzuschließenden Hochstromkabel zu gewährleisten, da bei den im Schmelzbereich herrschenden Temperaturen die mechanischen Eigenschaften solcher Elektroden stark beeinträchtigt sind und jede Art von lokaler mechanischer Verbindung -- wie beispielsweise Schrauben od. dgl. -- die Elektrode sehr schnell zerstören.In the case of funnel molds, the melt flow is required lead directly from the slag back into the network, because the smaller block diameter does not cover the entire melt flow can return. But since the slag in which the melting process takes place only in the liquid state is conductive, a direct power connection remains on the Mold wall impossible; through the water cooling of the Copper insert forms on the inside of the mold wall a hard, not melted - and therefore not conductive - slag layer. For this reason various additional electrodes used in the slag bath, that remain hot enough during melting to not to let the slag solidify and thereby the Ensure the return of electricity from the liquid slag to the network. Shows non-edible electrodes of this type US-A-4,145,563, for example, as for the consumable electrode axis-parallel stick electrodes or as - also that Slag bath outstanding - hollow cylinder electrodes that surround their consumable electrode at a distance. Be for non-consumable electrodes made of graphite elements or parts Graphite-copper-ceramic mixtures used, results in the problem of proper electrical contact between the electrode and a high-current cable to be connected ensure that the prevailing in the melting range Temperatures the mechanical properties of such Electrodes are severely affected and any type of local mechanical connection - such as Screws or the like - destroy the electrode very quickly.
In Kenntnis dieses Standes der Technik liegt der Erfindung die Aufgabe zugrunde, eine ESU-Trichterkokille zu schaffen, bei der die oben erwähnten Probleme nicht auftreten; die zum sicheren elektrischen Kontakt zwischen der nicht verzehrbaren Elektrode und den weiterleitenden Stromteilen notwendigen Kräfte sollen unabhängig von den sich ständig ändernden thermischen Bedingungen gute Arbeitsbedingungen für die Elektrode gewährleisten. The invention lies in knowledge of this prior art the task of creating an ESC funnel mold, in which the problems mentioned above do not occur; the for safe electrical contact between the non-consumable Electrode and the forwarding current parts necessary forces should be independent of the ones constantly changing thermal conditions good working conditions ensure for the electrode.
Diese Aufgabe wird durch die Lehre der unabhängigen Patentansprüche gelöst; die Unteransprüche geben günstige Weiterbildungen an.This task is accomplished through the teaching of the independent claims solved; the subclaims give favorable further training on.
Erfindungsgemäß ist im oberen Bereich des Einsatzrohres der Trichterkokille eine umlaufende Ausnehmung für eine etwa ringförmige Graphitelektrode vorgesehen und diese vom Einsatzrohr durch ein Isolationsorgan getrennt, wobei sich die Graphitelektrode unter dem Schlackenbadniveau befindet und von einem Isolierelement übergriffen ist, das mit der Graphitelektrode einen etwa ringförmigen Spalt begrenzt sowie mittels eines Hochstromkabels mit dem elektrischen Netz verbunden ist. Dazu hat es sich als günstig erwiesen, die Graphitelektrode zum Einsatzrohr hin einem keramischen Isolationsring aufzulegen, wobei sie von einem wassergekühlten Kontaktring als Isolierelement übergriffen wird.According to the invention is in the upper region of the insert tube Funnel mold a circumferential recess for approximately provided annular graphite electrode and this from the insert tube separated by an isolation organ, the Graphite electrode is located below the slag bath level and is overlapped by an insulating element that with the graphite electrode limited an approximately annular gap as well by means of a high-current cable to the electrical network connected is. In addition, it has proven to be cheap Graphite electrode towards the insert tube towards a ceramic insulation ring hang up, being from a water-cooled Contact ring is gripped as an insulating element.
Diese ESU-Trichterkokille besteht im wesentlichen aus einem -- in einem Wassermantel untergebrachten -- trichterförmigen Kupfereinsatzrohr, das im oberen Teil vorzugsweise zylindrisch ausgeführt ist und dessen unterer blockformender Teil einen runden, quadratischen oder sogar mehreckigen Querschnitt aufweisen kann. Die schulterartig ausgebildete Ausnehmung im oberen zylindrischen Teil des Einsatzrohres oder Kupfereinsatzes nimmt die ringförmige Graphitelektrode auf, die zum Einsatzrohr hin einer keramischen Isolierung -- bevorzugt einem keramischer Isolationsring -- aufliegt sowie zur Abschmelzelektrode hin jenem wassergekühlten Kontaktring zugeordnet ist.This ESU funnel mold essentially consists of one - placed in a water jacket - funnel-shaped Copper insert tube, which is preferably cylindrical in the upper part is executed and its lower block forming Part of a round, square or even polygonal May have cross-section. The shoulder-shaped Recess in the upper cylindrical part of the insert tube or copper insert takes the ring-shaped graphite electrode to the ceramic insulation tube - preferably a ceramic insulation ring - rests as well as towards the melting electrode towards that water-cooled contact ring assigned.
Erfindungsgemäß ist ein zwischen dem Kupfereinsatz bzw. Einsatzrohr und einem Mantelrohr gebildeter Spaltraum für das Kühlwasser im oberen Teil der Kokille durch einen O-Ring abgedichtet, der bevorzugt in einer sich zum Einsatzrohr öffnenden Nut im oberen zylindrischen Teil des Mantelrohres lagert. Im unteren Teil ist der Kühlwasserspalt durch einen anderen O-Ring wesentlich kürzeren Durchmessers durch einen anderen O-Ring wesentlich kürzeren Durchmessers abgedichtet, der sich -- wie jener andere O-Ring im oberen Teil der Kokille -- in einer zum Einsatzrohr offenen Nut befindet.According to the invention, a between the copper insert or Insert tube and a casing tube formed gap for the cooling water in the upper part of the mold through an O-ring sealed, which is preferably in a to the insert tube opening groove in the upper cylindrical part of the casing tube outsourced. The cooling water gap is in the lower part by another O-ring with a much shorter diameter by another O-ring with a much shorter diameter sealed, which - like that other O-ring in the upper Part of the mold - in a groove open to the insert tube located.
Der wassergekühlte Kontaktring ist vorteilhafterweise durch Stiftschrauben mit einer die Kokille haltenden Tragplatte so verbunden, daß er einerseits auf die Stiftschrauben umfassenden Isolationshülsen aufliegt, anderseits ein Ringspalt zwischen ihm und der ringförmigen Graphitelektrode in Ruhelage gewährleistet bleibt.The water-cooled contact ring is advantageously through Stud bolts with a support plate that holds the mold connected so that it encompasses the studs on the one hand Insulation sleeves rests on the other Annular gap between it and the annular graphite electrode remains guaranteed in the rest position.
Da die vom oberen O-Ring umfaßte Fläche erheblich größer ist als die entsprechende Fläche des unteren O-Ringes kürzeren Durchmessers, entsteht dank des Kühlwasserdruckes eine Kraft, die das Einsatzrohr zur Graphitelektrode hin drückt und letztere -- unter Minderung jenes Ringspaltes -an den Kontaktring preßt. Der elektrische Stromfluß ist gewährleistet; denn nach einem anderen Merkmal der Erfindung ist der Kontaktring mittels eines Hochstromkabels mit dem elektrischen Netz verbunden.Because the area covered by the upper O-ring is considerably larger is shorter than the corresponding area of the lower O-ring Diameter, arises thanks to the cooling water pressure a force that pushes the insert tube towards the graphite electrode presses and the latter - reducing that annular gap presses the contact ring. The electrical current flow is guaranteed; because according to another feature of the invention is the contact ring with a high current cable electrical network connected.
Die Vorteile der Erfindung sind
- eine konstante und gleichmäßig verteilte Kontaktkraft zwischen Graphitelektrode und Kontaktring, dadurch einwandfreie Stromrückführung von der flüssigen Schlacke zurück in das elektrische Netz;
- eine verlängerte Lebensdauer der Graphitelektrode, die auf die konstanten und gleichmäßig über den Umfang der Elektrode verteilten Kraft- und Temperaturbeanspruchungen zurückzuführen ist;
- die Vermeidung des negativen Einflusses aller mechanischen Ausdehnungserscheinungen infolge thermischer Beanspruchung, da sich der Kupfereinsatz und alle anderen thermisch beanspruchten Teile ausdehnen können.
- a constant and evenly distributed contact force between the graphite electrode and the contact ring, thus perfect current feedback from the liquid slag back into the electrical network;
- an extended life of the graphite electrode due to the constant and evenly distributed force and temperature stresses distributed over the circumference of the electrode;
- the avoidance of the negative influence of all mechanical expansion phenomena due to thermal stress, since the copper insert and all other thermally stressed parts can expand.
Dank der beschriebenen Maßgaben werden alle unerwünschten und nicht kalkulierbaren mechanischen Spannungen -- die an erster Stelle zur Zerstörung der Graphitelektrode führen könnten -- minimiert oder sogar vollkommen vermieden. Thanks to the described measures, all undesirable and incalculable mechanical stresses - the on lead to destruction of the graphite electrode could - minimized or even avoided entirely.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt jeweils schematisch in
- Fig. 1:
- einen Längsschnitt durch eine trichterförmige Kokille für das Elektroschlackeumschmelzen;
- Fig. 2:
- einen vergrößerten Ausschnitt aus Fig. 1 etwa nach deren Pfeil II.
- Fig. 1:
- a longitudinal section through a funnel-shaped mold for the electroslag remelting;
- Fig. 2:
- an enlarged section of FIG. 1 approximately according to the arrow II.
Eine Trichterkokille 10 für das sog. Elektroschlackeumschmelzen
(ESU) weist nach Fig. 1 ein aus Kupfer bzw. einer
Kupferlegierung einstückig geformtes Einsatzrohr 12 auf,
das aus einem zylindrischen Formrohr 14 -- eines Innendurchmessers
d und eines Außendurchmessers d1 --, einem
sich von diesem aufwärts konisch erweiternden Trichterabschnitt
15 und einem an dessen größten Durchmesser e anschließenden
zylindrischen Firstring 16 besteht. Das Einsatzrohr
12 ist von einem Mantelrohr 18 umgeben, das seinerseits
einen unteren Rohrabschnitt 19 und einen nach oben
angeformten Trichterabschnitt 20 anbietet.A
Die einander gegenüberstehenden Paarungen der zylindrischen
Rohrabschnitte 14,19 sowie der Trichterabschnitte 15,20
verlaufen in einem Spaltabstand a voneinander; der so gebildete
Spaltraum 22 dient der Kühlwasserführung und ist
nach oben hin durch einen O-Ring 24 abgedichtet. Dieser
ruht in einer Nut 25, die sich zwischen zwei einwärts weisenden
Radialrippen 26 eines Kragenringes 28 erstreckt.
Letzterer setzt -- in Spaltabstand a zum Firstring 16 des
Einsatzrohres 12 stehend -- das Mantelrohr 18, damit den
Spaltraum 22, fort und ist an eine Tragplatte 30 angefügt,
welche Zu- und Rückleitungen 31,32 für das Kühlwasser enthält. The opposing pairings of the
Am unteren Ende ist der Spaltraum oder Kühlwasserspalt 22
durch einen -- gegenüber dem oberen O-Ring 24 -- wesentlich
kleineren O-Ring 24t abgedichtet, der in einer Innennut 25i
eines -- an das Mantelrohr 18 angeflanschten und das Einsatzrohr
12 umfangenden -- Verschlußringes 34 sitzt.At the lower end of the gap or
In einer Schulterausnehmung 36, die durch einen -- aus jenem
Firstring 16 herausgeformten -- Winkelrand 17 angebotenen
wird, lagert auf einem keramischen Isolationsring 38
eine ringförmige Graphitelektrode 40. Diese wird von einem
jenen Winkelrand 17 in Abstand übergreifenden Kontaktring
42 überdeckt, der als Hohlprofil mit wasserführendem Kühlkanal
44 ausgebildet ist. Der Kontaktring 42 wird durch bei
46 angedeutete Stiftschrauben mit der Tragplatte 30 so verbunden,
daß er einerseits auf die Stiftschrauben 46 umfassenden
Isolationshülsen 48 aufliegt, anderseits mit der
ringförmigen Graphitelektode 40 einen Ringspalt 50 bildet.
Zudem ist der Kontaktring 42 durch ein Hochstromkabel 52
mit einem elektrischen Netz 54 verbunden.In a shoulder recess 36 through one - from that
Firstring 16 molded -
Nach entsprechender Vorbereitung der ESU-Trichterkokille 10
zum Anfahren eines Schmelzvorganges -- d.h. nach dem Einlassen
des Kühlwassers in den Kühlwasserspalt 22, Befüllen
der Trichterkokille 10 mit Schlacke 56 und Eintauchen einer
in der Kokillenachse A aufgehängten Abschmelzelektrode 58
unter Strom -- beginnt der Umschmelzvorgang.After appropriate preparation of the
Da die vom oberen O-Ring 24 umfaßte Fläche wesentlich größer
ist als die entsprechende Fläche am unteren O-Ring 24t,
entsteht -- angesichts eines im Kühlwasserspalt 22 herrschenden
Drucks des Kühlwassers -- eine Kraft, die auf das
Einsatzrohr 12 in Richtung F zur Graphitelektrode 40 wirkt
und das Einsatzrohr 12 soweit zur Graphitelektrode 40 ausstößt,
bis jener Ringspalt 50 geschlossen sowie ein sicherer
elektrischer Kontakt zwischen Graphitelektrode 40 und
Kontaktring 42 erreicht wird. Da der Kühlwasserdruck während
des Schmelzvorganges konstant bleibt, wirkt die Kraft
F ununterbrochen auf den Kupfereinsatz bzw. das Einsatzrohr
12. Aus diesem Grunde wird ein sicherer sowie gleichmäßiger
mechanischer und gleichzeitig elektrischer Kontakt zwischen
Graphitelektrode 40 und Kontaktring 42 gewährleistet.Since the area encompassed by the upper O-
Besteht der wassergekülte Kontaktring 42 aus einer kupferhaitigen
Legierung, ist es kein Problem, den sicheren
elektrischen Kontakt zwischen ihm und dem Hochstromkabel 52
mittels jeder beliebigen mechanischen Verbindungsart -- wie
Schrauben od. dgl. -- zu realisieren. Da die Graphitelektrode
40 immer unterhalb des Schlackenpegels 51 bleibt
und da sie ununterbrochen auf die Temperatur der geschmolzenen
Schlacke 56 aufgeheizt ist, wird der elektrische Kontakt
einerseits zwischen Schlacke 56 und Graphitelektrode
40 sowie anderseits zwischen letzterer und dem Kontaktring
42 ständig erhalten. Durch Absenken der axialen Abschmelzelektrode
58 in die Schlacke 56 schmilzt die Abschmelzelektrode
58 ab und tropft durch die Schlacke 56 abwärts.The water-cooled
Ein sich während des Schmelzvorgangs im unteren Teil der
Trichterkokille 10 bildender Ingot oder Block 60 wird beim
Absenken einer die Trichterkokille 10 nach unten begrenzenden
Plattform oder Bodenplatte 62 aus dem unteren blockformenden
Rohrabschnitt -- dem Formrohr 14 -- der Trichterkokille
10 ausgezogen.A during the melting process in the lower part of the
Claims (11)
- Funnel chill mould with funnel-shaped insert tube for the electroslag remelting of at least one consumable electrode (58), in particular a steel electrode, in special metallurgy, with a water-cooled insert tube (12) made of copper or a copper alloy, wherein the funnel chill mould which holds a slag bath and the consumable electrode partially immersed in the slag bath are connected to an electrical network, wherein in the upper region of the insert tube (12) is provided a peripheral recess (36) for an approximately annular graphite electrode (40) and the latter is separated from the insert tube by an insulation ring (38), wherein the graphite electrode is located below the slag bath level (51), characterised by a contact ring (42) which overlaps the graphite electrode (40) and with the graphite electrode defines an approximately annular gap (50) and also is connected to the electrical network (54) by means of a high-current cable (52).
- Chill mould according to claim 1, characterised in that the graphite electrode (40) towards the insert tube (12) rests on a ceramic insulation ring (38) and/or is overlapped by a water-cooled contact ring (42).
- Chill mould according to claim 1 or 2, characterised in that the recess (36) for the graphite electrode (40) is constructed as a shoulder recess of a peripheral angle edge (17) of the insert tube (12).
- Chill mould on a supporting member according to claim 2, characterised in that the water-cooled contact ring (42) is connected by studs (46) to a supporting plate (30) as the supporting member in such a way that on the one hand it rests on insulation bushes (48) encompassing the studs and on the other hand it forms with the annular graphite electrode (40) the annular gap (50).
- Chill mould with a lower mould tube (14) and a larger-diameter top ring (16) which is connected to the mould tube by a funnel section, according to any of claims 1 to 4, characterised in that between the insert tube (12) and a casing tube (18) surrounding the latter is formed a gap chamber (22) for cooling water which, both in the region of the top ring (16) and at the lower end of the mould tube (14) of smaller diameter (d), is defined in each case by at least one O-ring (24, 24i).
- Chill mould according to claim 5, characterised in that each O-ring (24, 24t) rests in a groove (25, 25i) which opens towards the insert tube (12).
- Chill mould according to claim 6, characterised in that the groove (25) for the larger-diameter O-ring (24) runs in a collar ring (28) which surrounds the top ring (16) of the insert tube (12) and which in turn defines a section of the gap chamber (22).
- Chill mould according to claim 6 or 7, characterised in that the groove (25i) for the O-ring (24t) of smaller diameter (d1) is provided in a closure ring (34) surrounding the mould tube (14) terminally.
- Chill mould according to claim 7, characterised in that the collar ring (28) is joined to the supporting plate (30).
- Chill mould according to any of claims 4 to 9, characterised in that associated with the supporting plate (30) are inlets and outlets (31, 32) for the cooling water of the gap chamber (22).
- Method for the electroslag remelting of a consumable electrode in a funnel chill mould with water-cooled insert tube, in particular a funnel chill mould with a graphite electrode adjacent to a contact ring over a gap chamber for cooling water surrounding the insert tube, according to one or more of claims 1 to 10, characterised in that by means of pressure prevailing in the gap chamber (22) a force (F) acting on the insert tube (12) towards the graphite electrode (40) is produced and the graphite electrode is pressed against the contact ring (42).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19728098A DE19728098A1 (en) | 1997-07-02 | 1997-07-02 | Funnel mold with funnel-shaped insert tube for electro-slag remelting and process for it |
| DE19728098 | 1997-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0892073A1 EP0892073A1 (en) | 1999-01-20 |
| EP0892073B1 true EP0892073B1 (en) | 2002-09-11 |
Family
ID=7834330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98110287A Expired - Lifetime EP0892073B1 (en) | 1997-07-02 | 1998-06-05 | Funnel-shaped mould with a liner tube for the electroslag remelting as well a process therefor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0892073B1 (en) |
| AT (1) | ATE223974T1 (en) |
| DE (2) | DE19728098A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363515C (en) * | 2005-03-28 | 2008-01-23 | 宝钢集团上海梅山有限公司 | Arcing and smelting technology for liquid slag in electroslag furnace |
| AT515566A1 (en) * | 2014-03-06 | 2015-10-15 | Inteco Special Melting Technologies Gmbh | Method for cooling liquid-cooled molds for metallurgical processes |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1583889C3 (en) * | 1968-01-08 | 1974-02-21 | Institut Elektroswarki Imeni E.O. Patona, Kiew (Sowjetunion) | Chilled bottom of a slag container for the electroslag remelting process |
| DE2328804C2 (en) * | 1973-06-06 | 1975-07-17 | Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln | Method for electroslag remelting in a funnel-shaped mold |
| US4145563A (en) * | 1976-04-22 | 1979-03-20 | Venjukovsky Armaturny Zavod | Plant for and method of electroslag remelting of metals and alloys |
| DE2724885C2 (en) * | 1976-07-14 | 1989-09-21 | Inteco Internationale Technische Beratung GmbH, Bruck an der Mur | Liquid-cooled sliding mold, in particular for electroslag remelting plants |
| SE8404116L (en) * | 1983-11-10 | 1985-05-11 | Cabot Corp | SET FOR REFINING METAL |
-
1997
- 1997-07-02 DE DE19728098A patent/DE19728098A1/en not_active Withdrawn
-
1998
- 1998-06-05 AT AT98110287T patent/ATE223974T1/en not_active IP Right Cessation
- 1998-06-05 EP EP98110287A patent/EP0892073B1/en not_active Expired - Lifetime
- 1998-06-05 DE DE59805484T patent/DE59805484D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0892073A1 (en) | 1999-01-20 |
| DE19728098A1 (en) | 1999-01-07 |
| ATE223974T1 (en) | 2002-09-15 |
| DE59805484D1 (en) | 2002-10-17 |
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