EP0187227A2 - Procédé et dispositif pour la coulée d'alliages de métaux fragiles - Google Patents

Procédé et dispositif pour la coulée d'alliages de métaux fragiles Download PDF

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Publication number
EP0187227A2
EP0187227A2 EP85114509A EP85114509A EP0187227A2 EP 0187227 A2 EP0187227 A2 EP 0187227A2 EP 85114509 A EP85114509 A EP 85114509A EP 85114509 A EP85114509 A EP 85114509A EP 0187227 A2 EP0187227 A2 EP 0187227A2
Authority
EP
European Patent Office
Prior art keywords
continuous casting
horizontal continuous
casting mold
drawing machine
holding times
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
EP85114509A
Other languages
German (de)
English (en)
Other versions
EP0187227B1 (fr
EP0187227A3 (en
Inventor
Achim Dipl.-Ing. Kubon
Wolfgang Prof. Dr.-Ing. Reichelt
Peter Dr.-Ing Voss-Spilker
Egil M. Ullebö
Halvard Tveit
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0187227A2 publication Critical patent/EP0187227A2/fr
Publication of EP0187227A3 publication Critical patent/EP0187227A3/de
Application granted granted Critical
Publication of EP0187227B1 publication Critical patent/EP0187227B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a method and an apparatus for casting brittle metal alloys, in particular ferro alloys, such as e.g. Ferrosilicon.
  • ferroalloys are cast in batches or discontinuously into molds.
  • the forms consist of disposable forms, e.g. Sand hearth casting, or from permanent molds, i.e. Molds.
  • the ferrosilicon which is cast in molds, is crushed into plates in a crusher or grinder to the desired grain size. This results in up to 20% unsaleable fines. This fine fraction is melted down again under the known difficulties associated with the use of dusts in metallurgical furnaces.
  • the object of the present invention is accordingly to improve the production and processing of ferroalloys in terms of manufacturing process technology, operational process technology, plant technology and with regard to the necessary investments.
  • the object is achieved according to the invention in that the molten metal is passed into a horizontal continuous casting mold, that the cast strand is essentially drawn at intervals and that holding times for depth-controlled notching between two drawing processes are observed over 0.5 to 10 seconds.
  • the invention could only be checked for its usability by tests.
  • ferro alloys have unfavorable flow and solidification properties, also tend to segregate the analysis and impair the structure. With ferro alloys, long-term temperature control is hardly possible. During the solidification, disadvantageous changes in state occur at temperature intervals. At higher temperatures, the crystal structure can decay (peritectics). There are also dangerous changes in volume during cooling (explosive effect).
  • the holding times are inserted after such drawing operations, the distances between which correspond to the later breaking lengths.
  • the portioning problem can therefore be solved due to the holding times.
  • the cooling of the cast strand is controlled in such a way that the temperature after leaving the drawing machine is above the critical value for brittle metal alloys.
  • the process according to the invention therefore advantageously leads to a continuous process, i.e.
  • bar brittle metal alloys, ferro alloys and non-metals, such as calcium carbide.
  • the process is optimized through the combination of horizontal continuous casting, the possibility of keeping warm with refining and portioning options.
  • the previous fine fraction is eliminated with simultaneous equalization or increase in product quality and dosage.
  • the structure of the product can be controlled.
  • the device for performing the method provides a storage vessel for the molten metal and flanged horizontal continuous casting mold.
  • the outlay for the device can now be reduced to the extent that the drawing machine is arranged at a short distance from a relatively short horizontal continuous casting mold and that a device for controlling a dry heat dissipation is subsequently provided between the horizontal continuous casting mold and the drawing machine and onto the drawing machine.
  • the device for controlling the dry heat dissipation consists of thermal insulation.
  • the holding times are matched to produce a programmed notch formation, with a more or less strong notch effect being controlled via the holding times.
  • the notches mainly result from the long solidification time and the cooling of this point to low temperatures, which no longer allow melting by subsequent liquid metal. With a corresponding recoil, the newly formed strand shell is bent inwards and thus offers a similar effect of the notching.
  • the device according to the further invention is now matched to these procedural measures by arranging a mechanical or thermal separating device following the drawing machine.
  • the mechanical separating device consists of a breaking device that takes advantage of the notch effect.
  • the thermal separation device consists of a cooling device that uses the shock effect.
  • the structural condition, the temperature, the granularity and. The like can also be influenced in that the treatment vessel is assigned a treatment vessel which is equipped with a heating device and / or with a refining device.
  • Embodiments of the invention are shown in the drawing and are described in more detail below.
  • the ferroalloy is transported from the melting furnace 1 in the pan 2 via a casting carousel 3 and poured into the rotating molds 4. After solidification, the ingots 5 are brought into the crusher 6 and then into the grinder 7, whereupon the end product 8 is a spectrum of fine and coarse-grained material.
  • the plant has the melting furnace 1, a pan 2, a storage vessel 9, a flanged horizontal continuous casting mold 10, a drawing machine 11 and a separating device 12.
  • the drawing machine 11 can e.g. be carried out in the way such is described in DE-Patent 32 06 501.
  • the end product 8 here consists of solid bodies 8a, which in this form (cylindrical round, cylindrical square and the like) are fed directly to alloying processes.
  • the metal melt 13 is brought to solidify from the outside inwards. This forms the strand shell 14.
  • the casting strand 15 which is formed is pulled out in steps at intervals for depth-controlled notch formation, stopped (0.5 to 10 seconds), possibly pushed back (0.5 to 3 mm) and moved out again. The selected cycles are repeated.
  • the holding times generally serve to form the strand shell or to accelerate the cooling of the material. Shorter holding times "a” and lifting marks 16 are provided for such cooling. Extended holding times "b", on the other hand, produce notches 17 which run around the cast strand 15 and which can widen to form visible grooves.
  • the cooling of the cast strand 15 outside the horizontal continuous casting mold 10 is slowed down by the fact that there is initially no conventional secondary cooling section. However, heat radiation can be largely prevented by thermal insulation. As a result, the cooling of the cast strand 15 is controlled in such a way that after leaving the drawing machine 12 the assembly temperature is above the critical value for brittle metal alloys. For ferrosilicon, this critical temperature is around 700 ° C.
  • the device (Fig. 1 and 6 to 9) consists of the reservoir 9 with pre-flanged water-cooled horizontal continuous casting mold 10 and the proven drawing machine with jaws and hydraulic control according to the aforementioned German patent 32 06 501.
  • the horizontal continuous casting mold 10 is relatively short;
  • the drawing machine 11 is located at a short distance 19 from this.
  • the horizontal continuous casting mold 10 or the drawing machine 11 is followed by a device 20 for controlling a dry heat dissipation.
  • Such thermal insulation can e.g. consist of an insulating tube.
  • the mechanical or thermal separation device 12 effects the separation of the bodies 8a by further sawing, breaking off or selective strong cooling, whereby no dust otherwise generated is generated. In this way, the cast strand 15 is subdivided into commercially available sizes or weights of the bodies 8a.
  • Suitable horizontal continuous casting molds 10 consist of graphite on the inside of the mold (if there is no C-solubility of the molten metal) or of copper.
  • the metal melt 13 flowing in at the casting speed or in the direction of production V is introduced through the refractory wall 21 or the jacket 22 of the distributor 9 and through the rear wall 23 of the horizontal continuous casting mold 10.
  • the rear wall 23 is designed according to FIG. 7 as a separate ring 24.
  • the horizontal continuous casting mold 10 has water cooling 25. This embodiment of the horizontal continuous casting mold 10 permits recoil of the casting strand 15.
  • the horizontal continuous casting mold 10 according to FIGS. 8 and 9 is provided for pulling out without recoil.
  • a pan 2 is used when, in addition to the temperature setting, the use of a metallurgical treatment is advantageous.
  • the storage vessel 9 does not fully offer these conditions.
  • the pan 2 forms a treatment vessel 26 with a heating device 27, which consists of a plasma torch 27a, a channel or coil inductor or one Pan lid heater is there.
  • a refining device 28 which can also be formed from the plasma torch 27a, for example, is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP85114509A 1984-12-14 1985-11-15 Procédé et dispositif pour la coulée d'alliages de métaux fragiles Expired EP0187227B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3445632 1984-12-14
DE3445632A DE3445632C1 (de) 1984-12-14 1984-12-14 Verfahren und Vorrichtung zum Stranggiessen von sproeden Metallegierungen

Publications (3)

Publication Number Publication Date
EP0187227A2 true EP0187227A2 (fr) 1986-07-16
EP0187227A3 EP0187227A3 (en) 1987-05-13
EP0187227B1 EP0187227B1 (fr) 1989-09-27

Family

ID=6252776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85114509A Expired EP0187227B1 (fr) 1984-12-14 1985-11-15 Procédé et dispositif pour la coulée d'alliages de métaux fragiles

Country Status (4)

Country Link
EP (1) EP0187227B1 (fr)
JP (1) JPS61144253A (fr)
DE (1) DE3445632C1 (fr)
NO (1) NO166355C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8806618U1 (de) * 1988-05-20 1988-07-21 INRESA Schultheiss GmbH, 7543 Engelsbrand Stranggußanlage
JP2848491B2 (ja) * 1988-11-16 1999-01-20 株式会社日立製作所 燃料噴射制御装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO118678B (fr) * 1966-02-01 1970-01-26 Union Carbide Corp
GB1175215A (en) * 1966-04-06 1969-12-23 United States Steel Corp Casting Ferromanganese.
US3382911A (en) * 1967-07-03 1968-05-14 United States Steel Corp Casting ferroalloys
EP0005340B1 (fr) * 1978-04-27 1983-01-26 Encomech Engineering Services Limited Réflecteur de chaleur pour matériaux de laminage
DE3206501C1 (de) * 1982-02-24 1983-04-07 Mannesmann AG, 4000 Düsseldorf Verfahren und Auszieheinrichtung zum Horizontalstranggiessen von Metall,insbesondere von Stahl
DE3426169C2 (de) * 1984-07-16 1986-06-05 Mannesmann AG, 4000 Düsseldorf Verfahren und Horizontalstranggießkokille zum Horizontalstranggießen von Metall, insbes. von Stahl, zu dünnen und breiten Strängen

Also Published As

Publication number Publication date
NO855037L (no) 1986-06-16
DE3445632C1 (de) 1986-02-06
EP0187227B1 (fr) 1989-09-27
NO166355B (no) 1991-04-02
JPS61144253A (ja) 1986-07-01
NO166355C (no) 1991-07-10
EP0187227A3 (en) 1987-05-13

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