EP0892073B1 - Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen sowie Verfahren dazu - Google Patents
Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen sowie Verfahren dazu 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
- Authority
- 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.
Landscapes
- 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)
Description
- 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.
- Fig. 1:
- einen Längsschnitt durch eine trichterförmige Kokille für das Elektroschlackeumschmelzen;
- Fig. 2:
- einen vergrößerten Ausschnitt aus Fig. 1 etwa nach deren Pfeil II.
Claims (11)
- Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen wenigstens einer Abschmelzelektrode (58), insbesondere einer Stahlelektrode in der Sondermetallurgie, mit einem wassergekühlten Einsatzrohr (12) aus Kupfer oder einer Kupferlegierung, wobei die ein Schlackenbad aufnehmende Trichterkokille und die teilweise in das Schlackenbad eintauchende Abschmelzelektrode an ein elektrisches Netz angeschlossen sind,
wobei
im oberen Bereich des Einsatzrohres (12) eine umlaufende Ausnehmung (36) für eine etwa ringförmige Graphitelektrode (40) vorgesehen und diese vom Einsatzrohr durch einen Isolationsring (38) getrennt ist, wobei sich die Graphitelektrode unter dem Schlackenbadniveau (51) befindet gekennzeichnet durch einen Kontaktring (42), der die Graphitelektrode (40) übergreift und mit der Graphitelektrode einen etwa ringförmigen Spalt (50) begrenzt sowie mittels eines Hochstromkabels (52) mit dem elektrischen Netz (54) verbunden ist. - Kokille nach Anspruch 1, dadurch gekennzeichnet, daß die Graphitelektrode (40) zum Einsatzrohr (12) hin einem keramischen Isolationsring (38) aufliegt und/oder von einem wassergekühlten Kontaktring (42) übergriffen ist.
- Kokille nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ausnehmung (36) für die Graphitelektrode (40) als Schulterausnehmung eines umlaufenden Winkelrandes (17) des Einsatzrohres (12) ausgebildet ist.
- Kokille an einem Tragorgan nach Anspruch 2, dadurch gekennzeichnet, daß der wassergekühlte Kontaktring (42) durch Stiftschrauben (46) mit einer Tragplatte (30) als Tragorgan so verbunden ist, daß er einerseits auf die Stiftschrauben umfassenden Isolationshülsen (48) aufliegt und anderseits mit der ringförmigen Graphitelektrode (40) den Ringspalt (50) bildet.
- Kokille mit einem unteren Formrohr (14) und einem Firstring (16) größeren Durchmessers, der mit dem Formrohr durch einen Trichterabschnitt verbunden ist, nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zwischen dem Einsatzrohr (12) und einem dieses umgebenden Mantelrohr (18) ein Spaltraum (22) für Kühlwasser gebildet ist, der sowohl im Bereich des Firstringes (16) als auch am unteren Ende des Formrohres (14) geringeren Durchmessers (d) jeweils durch wenigstens einen O-Ring (24,24i) begrenzt ist.
- Kokille nach Anspruch 5, dadurch gekennzeichnet, daß jeder O-Ring (24,24t) in einer zum Einsatzrohr (12) offenen Nut (25,25i) ruht.
- Kokille nach Anspruch 6, dadurch gekennzeichnet, daß die Nut (25) für den O-Ring (24) größeren Durchmessers in einem den Firstring (16) des Einsatzrohres (12) umgebenden Kragenring (28) verläuft, der seinerseits einen Abschnitt des Spaltraumes (22) begrenzt.
- Kokille nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Nut (25i) für den O-Ring (24t) geringeren Durchmessers (d1) in einem das Formrohr (14) endwärts umgebenden Verschlußring (34) vorgesehen ist.
- Kokille nach Anspruch 7, dadurch gekennzeichnet, daß der Kragenring (28) an die Tragplatte (30) angefügt ist.
- Kokille nach einem der Ansprüche 4 bis 9, dadurch gekennzeichnet, daß der Tragplatte (30) Zu- und Abflüsse (31,32) für das Kühlwasser des Spaltraumes (22) zugeordnet sind.
- Verfahren zum Elektroschlackeumschmelzen einer Abschmelzelektrode in einer Trichterkokille mit wassergekühltem Einsatzrohr, insbesondere einer Trichterkokille mit einer einem Kontaktring benachbarten Graphitelektrode über einem das Einsatzrohr umgebenden Spaltraum für Kühlwasser, nach wenigstens einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß mittels im Spaltraum (22) herrschenden Druckes eine auf das Einsatzrohr (12) zur Graphitelektrode (40) hin wirkende Kraft (F) erzeugt und die Graphitelektrode an den Kontaktring (42) gepreßt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19728098 | 1997-07-02 | ||
DE19728098A DE19728098A1 (de) | 1997-07-02 | 1997-07-02 | Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen sowie Verfahren dazu |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0892073A1 EP0892073A1 (de) | 1999-01-20 |
EP0892073B1 true EP0892073B1 (de) | 2002-09-11 |
Family
ID=7834330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98110287A Expired - Lifetime EP0892073B1 (de) | 1997-07-02 | 1998-06-05 | Trichterkokille mit trichterförmigem Einsatzrohr für das Elektroschlackeumschmelzen sowie Verfahren dazu |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0892073B1 (de) |
AT (1) | ATE223974T1 (de) |
DE (2) | DE19728098A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100363515C (zh) * | 2005-03-28 | 2008-01-23 | 宝钢集团上海梅山有限公司 | 一种电渣炉液渣起弧冶炼工艺 |
AT515566A1 (de) * | 2014-03-06 | 2015-10-15 | Inteco Special Melting Technologies Gmbh | Verfahren zur Kühlung von flüssigkeitsgekühlten Kokillen für metallurgische Prozesse |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1583889C3 (de) * | 1968-01-08 | 1974-02-21 | Institut Elektroswarki Imeni E.O. Patona, Kiew (Sowjetunion) | Gekühlter Boden eines Schlackenbehälters für das Elektroschlacke-Umschmelzverfahren |
DE2328804C2 (de) * | 1973-06-06 | 1975-07-17 | Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln | Verfahren zum Elektroschlacke-Umschmelzen In einer trichterförmigen Kokille |
US4145563A (en) * | 1976-04-22 | 1979-03-20 | Venjukovsky Armaturny Zavod | Plant for and method of electroslag remelting of metals and alloys |
DE2724885C2 (de) * | 1976-07-14 | 1989-09-21 | Inteco Internationale Technische Beratung GmbH, Bruck an der Mur | Flüssigkeitsgekühlte Gleitkokille, insbesondere für Elektroschlacke-Umschmelzanlagen |
SE8404116L (sv) * | 1983-11-10 | 1985-05-11 | Cabot Corp | Sett vid raffinering av metall |
-
1997
- 1997-07-02 DE DE19728098A patent/DE19728098A1/de not_active Withdrawn
-
1998
- 1998-06-05 AT AT98110287T patent/ATE223974T1/de not_active IP Right Cessation
- 1998-06-05 EP EP98110287A patent/EP0892073B1/de not_active Expired - Lifetime
- 1998-06-05 DE DE59805484T patent/DE59805484D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59805484D1 (de) | 2002-10-17 |
DE19728098A1 (de) | 1999-01-07 |
ATE223974T1 (de) | 2002-09-15 |
EP0892073A1 (de) | 1999-01-20 |
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