EP0187227B1 - 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
EP0187227B1
EP0187227B1 EP85114509A EP85114509A EP0187227B1 EP 0187227 B1 EP0187227 B1 EP 0187227B1 EP 85114509 A EP85114509 A EP 85114509A EP 85114509 A EP85114509 A EP 85114509A EP 0187227 B1 EP0187227 B1 EP 0187227B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
horizontal continuous
strand
process application
withdrawal machine
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
Application number
EP85114509A
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German (de)
English (en)
Other versions
EP0187227A3 (en
EP0187227A2 (fr
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
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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 single-use 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 percent unsaleable fines. This fine fraction is melted down again under the known difficulties associated with the use of dusts in metallurgical furnaces.
  • the investment costs for the casting carousel and the crusher or grinder are relatively high and energy-intensive in operation, and such plants work unsatisfactorily. Due to the circumstances, the state of the art is unsatisfactory in several respects: Batch-wise processing is disadvantageous from an operational process point of view. Technically, the 20% accumulation of fine fraction is extremely disadvantageous. In terms of plant technology, the high investment costs for the casting carousel, crusher and grinder are disadvantageous. Such systems also do not work satisfactorily from an operational point of view.
  • 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 by using the process of horizontal continuous casting, as it is e.g. is known from DE-A-32 06 501 and in the melt is passed into a horizontal continuous casting mold and the cast strand produced is essentially drawn at intervals and holding times between the drawing processes are observed, on the casting of brittle alloys, such as ferro alloys or calcium carbide , with the proviso that holding times of 0.5 to 10 seconds are observed in order to produce a desired notch formation in the strand, at intervals which correspond to later piece lengths of the product.
  • brittle alloys such as ferro alloys or calcium carbide
  • ferroalloys have unfavorable flow and solidification properties, also tend to segregate the analysis and impair the structure.
  • Long-term temperature control is difficult with ferroalloys.
  • disadvantageous changes in state occur at temperature intervals. At higher temperatures, the crystal structure can decay (peritectics).
  • uncontrolled breakage in the warm state with low mechanical stress must also be expected. All of these disadvantages are avoided by the invention.
  • the continuously operating casting process makes the operating process easier because the dust accumulation no longer occurs during continuous casting. Nevertheless, usable portions can be made and the large investment for the casting carousel, crushing or grinding mechanism is avoided.
  • the portioning problem is 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. for the continuous casting of materials that previously appeared not to be castable (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 the application of the horizontal continuous casting process provides a storage vessel for the molten metal with a flanged, short horizontal continuous casting mold and this subsequent drawing machine and is characterized in that after the horizontal continuous casting mold, the drawing machine is arranged at a short distance and that between the horizontal continuous casting mold and the drawing machine and the drawing machine subsequently a device for controlling a dry heat dissipation is provided.
  • 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 separation device consists of a crushing device that takes advantage of the notch effect.
  • the thermal separation device consists of a cooling device that uses the shock effect.
  • 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 manner described in DE-A 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 solidified from the outside inwards. In this way, the strand shell 14 is formed.
  • 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 pulled 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” (lifting marks 16) are provided for such cooling. Longer 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. In the case of ferrosilicon, this critical temperature is around 700 ° C.
  • the device (Fig. 2 and 6 to 9) consists of the storage vessel 9 with pre-flanged water-cooled horizontal continuous casting mold 10 and the proven drawing machine with jaws and hydraulic control according to DE-A-32 06 501.
  • the drawing machine 11 is located at a short distance 19 from the short horizontal continuous casting mold 10.
  • the horizontal continuous casting mold 10 or the drawing machine 11 is followed by a device 20 for controlling a dry heat dissipation.
  • a device 20 for controlling a dry heat dissipation can e.g. consist of an insulating tube.
  • the mechanical or thermal separator device 12 effects the separation of the body 8a by further sawing, breaking off or selective strong cooling, whereby no otherwise occurring dust 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 a pan lid heating device.
  • a refining device 28 which e.g. can also be formed from the plasma torch 27a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (8)

1. Application du procédé de la coulée continue horizontale dans lequel la fusion est dirigée dans une lingotière de coulée continue horizontale et la barre de coulée produite est essentiellement tirée par intervalles et des temps d'arrêt sont respectés entre les opérations de traction, procédé de coulée d'alliages fragiles tels que ferro-alliages ou carbure de calcium, avec pour objectif que pour la production d'une formation d'entailles souhaitée dans la barre, à des intervalles correspondant à des longueurs de pièce ultérieures du produit, des temps d'arrêt de 0,5 à 10 secondes sont respectés.
2. Application du procédé suivant revendication 1, caractérisée en ce qu'entre les temps d'arrêt pour longueurs de pièce (b) des temps d'arrêt plus courts (a) par rapport aux premiers nommés sont respectés.
3. Application du procédé suivant les revendications 1 et 2, caractérisée en ce que le refroidissement de la part de fonte est freinée hors de la lingotière de coulée continue horizontale.
4. Application du procédé suivant les revendications 1 à 3, caractérisée en ce que le refroidissement de la barre de coulée est commandé de telle façon qu'après la sortie de la machine de traction, la température est supérieure à la valeur critique pour alliages métalliques fragiles.
5. Dispositif dans l'utilisation du procédé de coulée continue horizontale suivant les revendications 1 à 4 avec un réservoir pour bain de fusion avec une lingotière de coulée continue horizontale courte bridée et une machine de traction disposée à la suite, caractérisé en ce que la machine de traction (11) est disposée à la suite de la lingotière de coulée continue horizontale (10) à une distance réduite (19) et qu'un dispositif (20) pour la commande d'une dissipation sèche de la chaleur est prévue entre la lingotière de coulée continue horizontale (10) et la machine de traction (11) ainsi qu'à la suite de la machine de traction (11).
6. Dispositif suivant revendication 5, caractérisé en ce que le dispositif (20) pour la commande de la dissipation sèche de la chaleur est constitué par une isolation thermique.
7. Dispositif suivant les revendications 5 et 6 caractérisé en ce qu'une tronçonneuse (12) mécanique ou thermique connue en soi est disposée à la suite de la machine de traction (11), la tronçonneuse mécanique
(12) se composant d'un dispositif utilisant l'effet d'entaille et la tronçonneuse thermique (12) d'un dispositif de refroidissement utilisant l'effet de choc.
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 EP0187227A2 (fr) 1986-07-16
EP0187227A3 EP0187227A3 (en) 1987-05-13
EP0187227B1 true 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
DE3445632C1 (de) 1986-02-06
NO166355C (no) 1991-07-10
NO166355B (no) 1991-04-02
EP0187227A3 (en) 1987-05-13
EP0187227A2 (fr) 1986-07-16
JPS61144253A (ja) 1986-07-01
NO855037L (no) 1986-06-16

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