EP0207066A2 - Procédé et dispositif de fabrication de lingots - Google Patents

Procédé et dispositif de fabrication de lingots Download PDF

Info

Publication number
EP0207066A2
EP0207066A2 EP86890177A EP86890177A EP0207066A2 EP 0207066 A2 EP0207066 A2 EP 0207066A2 EP 86890177 A EP86890177 A EP 86890177A EP 86890177 A EP86890177 A EP 86890177A EP 0207066 A2 EP0207066 A2 EP 0207066A2
Authority
EP
European Patent Office
Prior art keywords
mold
cooled
attachment
melt
electrode
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.)
Granted
Application number
EP86890177A
Other languages
German (de)
English (en)
Other versions
EP0207066A3 (en
EP0207066B1 (fr
Inventor
Herbert Barg
Peter Dipl.-Ing. Machner
Wilfried Dr. Meyer
Werner Dr. Mitter
Kurt Ing. Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boehler GmbH
Original Assignee
Vereinigte Edelstahlwerke AG
Boehler GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vereinigte Edelstahlwerke AG, Boehler GmbH filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0207066A2 publication Critical patent/EP0207066A2/fr
Publication of EP0207066A3 publication Critical patent/EP0207066A3/de
Application granted granted Critical
Publication of EP0207066B1 publication Critical patent/EP0207066B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B22D27/06—Heating the top discard of ingots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor

Definitions

  • the invention relates to a method and an apparatus for the production of blocks, in which a metallic melt, e.g. Steel melt is introduced into a one-part or multi-part mold with an attachment, whereupon the block is allowed to solidify with the addition of heat.
  • a metallic melt e.g. Steel melt
  • Typical defects are the negatively segregated bottom cone, in many cases also contaminated with non-metallic inclusions, shrinkage cavities, connected with V segregations in the block axis, in the block crest the positive segregation with enrichments of C, S and P, and finally the A or h segregations with enrichments of S and P. There is currently no generally accepted theory for the origin of these segregations.
  • a water-cooled ring is inserted into a conventional forging block mold, the mold is filled with steel, and a layer of metallurgically active slag is placed on the steel, into which an electrode is immersed.
  • the slag bath is heated so strongly that the electrode melts and compensates for shrinkage cavities in the block during the solidification process.
  • the solidification can also be influenced by targeted variation of the energy supply. Blocks produced by this method have no negative soil segregation with the associated disadvantages, no V segregation and hardly any shrinkage cavities. This has been demonstrated on several thousand forging blocks that were manufactured using this method.
  • the object of the present invention is now to create a method and a device which also make it possible to reliably avoid substitute error sizes by 1 mm, at the same time requiring no increased or no significantly increased effort both on the energy side and for the devices should be.
  • a metallic melt e.g. Melting steel
  • an attachment in particular a water-cooled hood, preferably to below the attachment
  • an electrically conductive slag preferably liquefied hot slag
  • the melt heat and optionally further melt is fed consists essentially in that the mold in its upper region and thus the solidifying block below the cap retards heat, in particular solidification heat, and / or is dissipated, preferably the lower part of the mold, in particular the base plate, is cooled, preferably fluid-cooled, while heat and, if appropriate, molten metal is supplied via the electrode during the solidifying block.
  • heat is supplied to the slag with a power density of 0.4 to 2.0, in particular 0.5 to 2.0 kW / cm 2 and a current density of 8 to 25 A / cm 2 in each case Electrode. It can be achieved that two superimposed forces occur in the slag, the thermally induced force causing a bath movement in such a way that the slag rises below the electrode, moves on the surface to the outside of the hood and then the cooled slag to the Surface of the molten metal comes and cools down.
  • the advantageous slag movement which is caused by the preferably larger Lorenz force, runs approximately in the opposite direction into the block, namely the hot slag sinks below the electrode to the metal surface, releases its heat to the metal mirror and then moves to the edge of the attachment , rises up there along the wall and the cooled slag moves back to the electrode on the surface of the slag level.
  • This also creates a lid made of solidified slag, which is also desirable because thermal insulation is achieved.
  • the inventive device for producing metallic blocks having a Kokillearranged multi-part mold which comprises an optionally liquid cooled articles, in which a particular severzehrenoe electrode projects, which is p with a pole of an S coupled annungsouelle, while a further electrode and / or the bottom area , especially the Bottom plate of the mold is connected to another pole of the voltage source, consists essentially in that the mold is thermally insulating in its upper region below the attachment, in particular has thermal insulation, preferably on the outer wall of the mold, which is preferably over a third the height of the mold extends without an attachment and that preferably the base plate can be cooled, in particular fluid-cooled.
  • the mold has a greater wall thickness towards its lower region, in particular one assigned to the base plate, than towards its upper region.
  • the higher wall thickness in the lower area results in a higher heat absorption capacity due to the higher mass, in addition the contact area with the base plate is increased, while the lower wall thickness in the upper area results in a reduced heat absorption capacity.
  • the device for producing blocks shown schematically in the drawing has a base plate 1, which is supplied with cooling water via water supply and discharge lines 2, 3, cooling with another fluid, e.g. Liquid metal, gases or the like can also be made.
  • a base plate 1 which is supplied with cooling water via water supply and discharge lines 2, 3, cooling with another fluid, e.g. Liquid metal, gases or the like can also be made.
  • On the base plate there is a lower part 4 of the mold, which has a recess 5 into which the pouring channel opens for an increasing casting.
  • the middle part 6 of the mold has a slightly conical cross section that opens upwards.
  • an upper mold part 7 is placed, which carries on its outside thermal insulation 8, which is filled with mineral insulation, for example mineral wool, vermiculite or asbestos, and has a sheet metal jacket for protection against mechanical damage.
  • a water-cooled attachment 9 is provided, in which a melting electrode 10 is arranged. Both the base plate 1 and the electrode 10 are connected to a voltage source 11, shown schematically.
  • the melt was then across the electrode in the course of solidification of 1 0 hours heat and indeed initially with a procedurecichte of 1.33 kW / cm 2 and a current density of 12 amperes / cm 2 at the electrode.
  • the block solidified completely after 16 hours, whereupon both the coolant supply to the base plate and to the attachment was interrupted, and at the same time no further heat was supplied via the melting electrode.
  • the block thus obtained was examined with ultrasound and showed no inclusions with substitute defect sizes of around 1 mm in the foot, in the center or in the head.
  • Example 2 The procedure was analogous to Example 1, but the device had no thermal insulation in the upper third of the mold.
  • the block did not have a negatively inclined bottom cone with partially coarse non-metallic inclusions, had hardly any lambda or shadow stripes, and there were no V-segregations and hardly any shrinkage cavities, but non-metallic inclusions with substitute error sizes of around 1 mm were found during the ultrasound test.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP86890177A 1985-06-19 1986-06-17 Procédé et dispositif de fabrication de lingots Expired - Lifetime EP0207066B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1828/85 1985-06-19
AT0182885A AT395296B (de) 1985-06-19 1985-06-19 Verfahren und vorrichtung zur herstellung von bloecken

Publications (3)

Publication Number Publication Date
EP0207066A2 true EP0207066A2 (fr) 1986-12-30
EP0207066A3 EP0207066A3 (en) 1989-03-29
EP0207066B1 EP0207066B1 (fr) 1991-01-09

Family

ID=3521861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890177A Expired - Lifetime EP0207066B1 (fr) 1985-06-19 1986-06-17 Procédé et dispositif de fabrication de lingots

Country Status (6)

Country Link
EP (1) EP0207066B1 (fr)
JP (1) JPS61291912A (fr)
KR (1) KR870000120A (fr)
AT (1) AT395296B (fr)
BR (1) BR8602815A (fr)
DE (1) DE3676748D1 (fr)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE855151C (de) * 1950-11-11 1954-04-08 Gussstahlwerk Bochumer Ver Ag Giessform und Verfahren zur Herstellung von Stahlbloecken
CH351719A (de) * 1956-02-22 1961-01-31 Bochumer Verein Fuer Gussstahl Verfahren und Vorrichtung zur Erzeugung von schweren Stahlblöcken, z.B. Schmiedeblöcken, mit guten mechanischen Eigenschaften im Innern
GB948161A (en) * 1959-09-11 1964-01-29 British Oxygen Co Ltd Manufacture of steel ingots or castings
AT287215B (de) * 1968-01-09 1971-01-11 Boehler & Co Ag Geb Verfahren und Vorrichtung zum Elektroschlackenumschmelzen von Metallen, insbesondere von Stählen
AT297959B (de) * 1968-06-28 1972-04-25 Boehler & Co Ag Geb Verfahren zum Elektroschlackeumschmelzen von Metallen und Legierungen
US3820587A (en) * 1969-01-20 1974-06-28 Boehler & Co Ag Geb Apparatus for making metal ingots
AT295061B (de) * 1969-09-18 1971-12-27 Boehler & Co Ag Geb Verfahren und Vorrichtungen zum Elektroschlackenumschmelzen von Metallen, insbesondere von Stählen
JPS51149824A (en) * 1975-06-18 1976-12-23 Nippon Kokan Kk Downwardly divergent mold
IT1040998B (it) * 1975-07-23 1979-12-20 Centro Speriment Metallurg Materozza per la produzione di lingotti fusi sotto elettroscoria
DE2604817A1 (de) * 1976-02-07 1977-08-11 Ver Edelstahlwerke Ag Verfahren und vorrichtung zur herstellung von bloecken
DE2654834C2 (de) * 1976-12-03 1984-05-30 Vereinigte Edelstahlwerke AG (VEW) Wien AT Niederlassung Vereinigte Edelstahlwerke AG (VEW) Verkaufsniederlassung Büderich, 4005 Meerbusch Verfahren zur Blockkopfbeheizung
DE2655602C2 (de) * 1976-12-08 1982-12-02 Vereinigte Edelstahlwerke AG (VEW) Wien AT Niederlassung Vereinigte Edelstahlwerke AG (VEW) Verkaufsniederlassung Büderich, 4005 Meerbusch Verfahren und Vorrichtung zur Herstellung von Blöcken
IT1077822B (it) * 1977-02-04 1985-05-04 Terni Ind Elettr Dispositivo per l'alimentazione di metallo fuso durante la solidificazione dei lingotti

Also Published As

Publication number Publication date
AT395296B (de) 1992-11-10
ATA182885A (de) 1992-04-15
JPS61291912A (ja) 1986-12-22
KR870000120A (ko) 1987-02-16
BR8602815A (pt) 1987-02-10
DE3676748D1 (de) 1991-02-14
EP0207066A3 (en) 1989-03-29
EP0207066B1 (fr) 1991-01-09

Similar Documents

Publication Publication Date Title
EP0786531B2 (fr) Procédé et dispositif pour la refusion de métaux sous forme de barres
DE812211C (de) Verfahren zur Herstellung des unteren Teiles des Tiegels von Zellen zur schmelzfluessigen Elektrolyse und nach diesem Verfahren her-gestellte Zelle fuer die Schmelzflusselektrolyse
EP1253986B1 (fr) Procede et dispositif de fabrication de corps coules en metal
DE2609949C3 (de) Verfahren und Vorrichtung zur Herstellung eines Gußstücks aus in einer Richtung erstarrter Metallegierung
DE3421488A1 (de) Verfahren zum herstellen von legierungspulver und vorrichtung zur durchfuehrung des verfahrens
DE2655602C2 (de) Verfahren und Vorrichtung zur Herstellung von Blöcken
DE2241894B2 (de) Verfahren und Vorrichtung zum Herstellen eines hohlen Metallgegenstands mit sphärisch ausgebildeter Schale
DE220035C (fr)
EP0207066B1 (fr) Procédé et dispositif de fabrication de lingots
DE2816569C2 (de) Verfahren zur Herstellung von mit Boden versehenen hohlen metallischen Gußstücken zur Bildung von Behältern o.dgl.
DE2400578A1 (de) Verfahren zur instandsetzung schwerer eisengegenstaende
DE2941849A1 (de) Verfahren zur herstellung von konstruktionsteilen durch elektro- schlacke-schweissen
DE2001256B2 (de) Vorrichtung zur herstellung von bloecken
DE2339979C3 (de) Verfahren und Vorrichtung zur Herstellung eines Metallgegenstandes
AT395389B (de) Verfahren zur herstellung von block- und formgussstuecken sowie vorrichtung zur herstellung derselben
DE19710887C2 (de) Verwendung einer Kokille zum Herstellen von Barren aus Leichtmetall oder einer Leichtmetallegierung, insbesondere aus Magnesium oder einer Magnesiumlegierung
DD251517A5 (de) Verfahren und vorrichtung zur herstellung von bloecken
DE2632863C2 (de) Einrichtung zur Herstellung von großtonnagigen Metallblöcken durch Elektroschlackenumschmelzen
EP0229589B1 (fr) Dispositif et procédé de coulée continue de métaux
DE1608069C (de) Verfahren zur Herstellung von Metall gußblocken durch Elektroschlackeumschmelzen und Anlage zur Durchfuhrung des Verfahrens
EP0846510B1 (fr) Utilisation d'une coquille pour fabrication de bars en métal léger ou alliage léger, notamment de magnésium ou d'alliage de magnésium
AT282845B (de) Verfahren zur Herstellung von Blöcken
DE2319982C3 (de) Einrichtung zur Elektroschlacke-Erschmelzung von Metallhohlblöcken
DE2143445C3 (de) Verfahren und Vorrichtung zum Herstellen von metallischen Blöcken
AT46150B (de) Verfahren zum Gießen von dichten Brammen, Blöcken oder anderen Gußstücken.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE CH DE FR GB IT LI SE

17P Request for examination filed

Effective date: 19870520

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BOEHLER GESELLSCHAFT M.B.H.

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE CH DE FR GB IT LI SE

17Q First examination report despatched

Effective date: 19891020

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 3676748

Country of ref document: DE

Date of ref document: 19910214

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920507

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920516

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920518

Year of fee payment: 7

Ref country code: BE

Payment date: 19920518

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920520

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920525

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930617

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930618

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930630

Ref country code: CH

Effective date: 19930630

Ref country code: BE

Effective date: 19930630

BERE Be: lapsed

Owner name: BOHLER G.M.B.H.

Effective date: 19930630

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930617

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940228

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940301

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 86890177.8

Effective date: 19940110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050617