EP0544931B1 - Procédé de coulée continue de lingots métalliques - Google Patents

Procédé de coulée continue de lingots métalliques Download PDF

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Publication number
EP0544931B1
EP0544931B1 EP91120532A EP91120532A EP0544931B1 EP 0544931 B1 EP0544931 B1 EP 0544931B1 EP 91120532 A EP91120532 A EP 91120532A EP 91120532 A EP91120532 A EP 91120532A EP 0544931 B1 EP0544931 B1 EP 0544931B1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
lining plate
metal strips
strips according
chill
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
Application number
EP91120532A
Other languages
German (de)
English (en)
Other versions
EP0544931A1 (fr
Inventor
Christian Dipl.-Ing. Triquet
Hubertus Dr. Brüning
Andreas Dr. Krause
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.)
KM Europa Metal AG
Original Assignee
KM Europa Metal 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 KM Europa Metal AG filed Critical KM Europa Metal AG
Publication of EP0544931A1 publication Critical patent/EP0544931A1/fr
Application granted granted Critical
Publication of EP0544931B1 publication Critical patent/EP0544931B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings

Definitions

  • the invention relates to a method for the continuous casting of metallic strands, in particular wide rectangular slabs made of copper or a copper alloy, with a cooling mold lined with highly heat-resistant material for pouring the metal melt.
  • molds consisting of cooled copper plates are usually used, which form the mold cavity.
  • a highly heat-resistant material for example graphite, can be arranged as a separating or lubricating agent, especially when continuously casting copper and copper alloys between the melt and mold plates (cf. EP-A-52947, SU-A- 806 237).
  • the present invention has for its object to provide a method of the type mentioned in such a way that the lining material for the cooling mold has a low thermal resistance and still has sufficient abrasion resistance. Furthermore, the assembly and maintenance effort for the lining should be kept as low as possible.
  • the method according to the invention surprisingly achieves a significantly longer lifespan for the lining. Due to the good heat dissipation of the cooling mold, the cast strands also have a very smooth strand shell, so that the surface finishing that has been customary up to now can be omitted.
  • the mold has no fastening elements that could additionally hinder the formation of a smooth strand shell. Rather, the problem of fastening the lining plates was solved in that they are sucked onto the mold base plates by negative pressure.
  • negative pressure there are numerous holes within the mold base plates, which are connected to a suction or vacuum pump via a pipe system. In this way, a negative pressure can be generated in these holes relative to the ambient atmosphere if the holes on the melt-side surface of the mold base plates are covered and the suction pump is in operation.
  • a thin lining plate for example an approximately 3 mm thick graphite plate, is placed on the surface of a mold base plate facing the melt, it is sucked in uniformly by the negative pressure in the bores. With this method it is possible to attach thin-walled lining panels to mold base panels without the need for disruptive connecting elements within these panels.
  • a lining plate made of graphite is usually slightly porous, it is necessary that the suction pump is also in operation during the casting process, in order to constantly ensure the negative pressure within the suction hole and thus the adhesion of the graphite plates to the mold base plates.
  • the negative pressure in the suction bores and channels can be within a wide range of values.
  • a vacuum of significantly less than 10% of the ambient pressure, for example 0.1% of the ambient pressure, is expediently and technically feasible without too much effort.
  • a further reduction in the negative pressure is possible without further ado, but does not bring any significant technological advantages.
  • the preferred range for the negative pressure to be maintained in the intake system is within the limits of 0.1 to 10% of the ambient pressure (10,000 to 100 Pa).
  • the compressive force with which the lining plate is pressed onto the base plate essentially depends on the area of the bore cross sections.
  • a rectangular mold suitable for the continuous casting of a copper alloy consisted of two mold base plates for the long sides, which had a length of 400 mm and a width of 300 mm. In each of these two base plates, suction holes with a diameter of 4 mm were made at a distance of about 20 mm, which were arranged horizontally and vertically next to each other in rows.
  • the total cross-sectional area of the suction bores is approximately 4200 mm2 and assumes a pressure difference of 50,000 Pa between ambient pressure and internal pressure in the bores, then the total pressure or contact pressure that was exerted on the lining plate is calculated from this information , to about 210 N.
  • This pressure force can be increased with the same pressure difference if the number of bores and / or their diameter is increased, since the cross-sectional area effective for the negative pressure is increased in this way.
  • the same effect can also be achieved in that the melt-side surface of the mold base plate is covered with fine grooves or suction channels into which the suction holes open. It is particularly advantageous if the intake ducts have a depth of more than 0.05 mm and the width is in the range from 0.05 mm to 3 ⁇ d, d being the thickness of the lining plate.
  • the cooling capacity of a mold with a thin-walled lining plate depends to a large extent on the conditions of heat transfer from the lining plate to the cooled mold base plate. Good heat transfer requires intensive contact between the lining plate and the mold base plate. This is guaranteed by a high contact pressure.
  • a prerequisite for the suction of usually slightly porous lining plates made of graphite-containing material is that the suction pump has a sufficiently high output. Under unfavorable circumstances, however, these lining plates can corrode, in particular if air is sucked in from the surroundings and reacts with the lining material (e.g. graphite, boron nitride) in the pores of the lining plate.
  • the lining material e.g. graphite, boron nitride
  • lining plates in which the porosity has been reduced or eliminated, for example, before installation by metal infiltration.
  • the lining plate can also be provided on the suction side with a coating that reduces the gas permeability. Lining plates of this type then also have the advantage that the negative pressure in the suction channels can be better maintained, as a result of which both the suction behavior and the contact intensity are improved.
  • the contact surfaces of the mold base plate are coated with a mixture of liquid gallium and fine copper dust.
  • a thin-walled lining plate made of graphite-containing material is then arranged on the mold base plate.
  • the contact mixture penetrates into the microscopic cavities and thus improves the contact. This mixture solidifies as a result of alloying through heat treatment or during the first casting process.
  • the contact surfaces of the mold base plates made of copper or a hardenable copper alloy are first roughened and then before application of the lining plates coated with liquid gallium. The gallium fills the small cavities and later solidifies with the material of the mold base plate through the formation of alloys.
  • pasty contact media with higher thermal conductivity, which essentially retain their pasty properties even during the casting process.
  • These pastes consist of small solid particles, preferably those that have a high thermal conductivity.
  • These solid particles for example copper powder particles, are in a liquid carrier medium, which also preferably has a higher thermal conductivity than the material of the lining plate.
  • Such a pasty contact medium is applied to the contact surfaces of the mold base plate before the mold base and lining plate are pressed firmly together.
  • a paste has proven to be particularly favorable which consists of a mixture of graphite particles or graphite-coated copper powder particles and a carrier material consisting of indium and / or gallium.
  • the thickness of the lining plate can range from about 0.2 to 15 mm. A plate thickness of 1 to 5 mm is particularly preferred.
  • the lining plate can consist both of graphite-containing material and of a composite material which contains, for example, graphite or boron nitride as a lubricant.
  • a sealing tape can also be used, which has a slight flexibility and thus adjusts to possible unevenness when the lining plate is pressed on.
  • Frictional forces exerted on the lining plate by the strand shell of the moving cast strand Despite sufficient adhesion of the lining plate to the mold base plate, frictional forces can cause the lining plate to shift somewhat in the pulling direction during operation. This would lead to the fact that the residual gas pressure in the intake duct system can rise due to the penetrating ambient air and the adhesion of the lining plate is deteriorated. If necessary, the casting process would then have to be interrupted in order to reposition the lining plate. In order to avoid this disadvantage, it is expedient to provide brackets on the mold base plate that reliably prevent the lining plate from slipping. In the simplest case, the mold base plate has a small projection at the lower end on which the lining plate is seated.
  • a holder can also be provided in the upper part of the mold.
  • the brackets must be installed in such a way that the thermal expansion of the lining plate can in no way be impeded.
  • the heat transfer resistance between two parallel interfaces can be changed by changing the contact pressure with which the two interfaces are pressed against each other. Accordingly, the local heat flow density within a cooling mold equipped with lining plates can be locally reduced, for example, by locally reducing the contact pressure or the suction pressure. Under certain conditions, this can be desirable for the use of a mold with lining plates.
  • the areas on the narrow sides of a mold and especially the corner areas are cooled more than the middle of the long sides, since the ratio of slab surface to slab volume is particularly large here. This finds expression in the fact that the solidification proceeds correspondingly faster in these more cooled areas.
  • An uneven or unfavorable solidification behavior can lead to stresses in the solidified material with certain alloys and to cracks or deformations if these stresses become too great.
  • the cooling conditions are adapted locally to the desired conditions and that certain partial areas of the lining plate are sucked onto the surface of the mold base plate with a greater contact force than the other areas.
  • Locally different contact pressures on the mold base plate can be achieved, for example, by separate suction systems with different negative pressures or by changing the area density of the suction bores or suction channels in some areas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mold Materials And Core Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (13)

  1. Procédé de coulée en continu de barres métalliques, notamment de barres rectangulaires larges en cuivre ou alliages de cuivre, avec une coquille de refroidissement revêtue de matériau réfractaire pour couler la masse fondue de métal, caractérisé en ce qu'on place sur la surface de la coquille de refroidissement tournée vers la masse fondue de métal une plaque de revêtement mince qu'on maintient à l'aide de dépression à la surface de la coquille de refroidissement.
  2. Procédé de coulée en continu de barres métalliques selon la revendication 1, caractérisé en ce que la plaque de revêtement présente une épaisseur se trouvant dans l'intervalle de 0,2 à 15 mm, de préférence dans l'intervalle de 1 à 5 mm.
  3. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 ou 2, caractérisé en ce que la plaque de revêtement est constituée essentiellement de graphite et/ou de nitrure de bore.
  4. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 ou 2, caractérisé en ce que la plaque de revêtement est constituée d'un matériau composite, qui contient du graphite ou du nitrure de bore comme lubrifiant.
  5. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 4, caractérisé en ce que pour maintenir la plaque de revêtement sur la coquille de refroidissement on utilise une basse pression qui est dans l'intervalle d'environ 10 000 à 100 Pa.
  6. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 5, caractérisé en ce qu'on applique la plaque de revêtement à l'aide de trous d'aspiration et/ou de rainures d'aspiration disposés dans la coquille de refroidissement.
  7. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 6, caractérisé en ce que du côté de l'aspiration la plaque de revêtement est munie d'un revêtement qui diminue la perméabilité au gaz.
  8. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 7, caractérisé en ce qu'entre la coquille de refroidissement de la plaque de revêtement est disposée une couche mince d'un milieu de contact conducteur de la chaleur, où le milieu de contact est solide à la température de service.
  9. Procédé de coulée en continu de barres métalliques selon la revendication 8, caractérisé en ce que le milieu de contact est en alliage de cuivre contenant du gallium.
  10. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 7, caractérisé en ce qu'entre la coquille de refroidissement et la plaque de revêtement on place une couche mince d'un milieu de contact conducteur de la chaleur, qui est pâteux à la température de service.
  11. Procédé de coulée en continu de barres métalliques selon la revendication 10, caractérisé en ce que le milieu de contact est un mélange contenant des particules de graphite, qui présente comme matériau véhicule du gallium et/ou de l'indium.
  12. Procédé de coulée en continu de barres métalliques selon la revendication 10, caractérisé en ce que le milieu de contact est un mélange contenant des particules de métal enrobées de graphite, de préférence des particules de poudre de cuivre et du gallium et/ou de l'indium comme matériau véhicule.
  13. Procédé de coulée en continu de barres métalliques selon l'une des revendications 1 à 7, caractérisé en ce qu'au moins un domaine partiel de la plaque de revêtement est aspiré avec une plus grande force à la surface de la coquille de refroidissement que les autres domaines.
EP91120532A 1990-11-20 1991-11-29 Procédé de coulée continue de lingots métalliques Expired - Lifetime EP0544931B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4036893A DE4036893C2 (de) 1990-11-20 1990-11-20 Verfahren zum kontinuierlichen Gießen von metallischen Strängen

Publications (2)

Publication Number Publication Date
EP0544931A1 EP0544931A1 (fr) 1993-06-09
EP0544931B1 true EP0544931B1 (fr) 1996-05-22

Family

ID=6418583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120532A Expired - Lifetime EP0544931B1 (fr) 1990-11-20 1991-11-29 Procédé de coulée continue de lingots métalliques

Country Status (7)

Country Link
EP (1) EP0544931B1 (fr)
AT (1) ATE138301T1 (fr)
DE (1) DE4036893C2 (fr)
DK (1) DK0544931T3 (fr)
ES (1) ES2087216T3 (fr)
GR (1) GR3020284T3 (fr)
LU (1) LU88041A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006015282A1 (de) * 2006-04-01 2007-10-04 Honeywell Technologies Sarl Ecc Kokille und Verfahren zum Gießen von Rotguss

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060070716A1 (en) * 2004-10-04 2006-04-06 Russel Nippert Method and system for continuously casting copper alloys
CN103357826A (zh) * 2012-04-03 2013-10-23 中色奥博特铜铝业有限公司 一种改善结晶器整体冷却效果的方法
DE102014218449A1 (de) * 2014-09-15 2016-03-17 Schunk Kohlenstofftechnik Gmbh Gussform und Verfahren zur Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1313397A (fr) * 1962-01-09 1962-12-28 Yorkshire Imp Metals Ltd Moule pour coulée continue
FR2123108A1 (en) * 1971-01-05 1972-09-08 Mitsubishi Metal Mining Co Ltd Graphite wall continuous casting mould - with a metal skin
GB2087769B (en) * 1980-11-22 1984-08-01 Mapplebeck John E Ltd Casting mould
BR8605835A (pt) * 1986-11-28 1987-09-01 Mannesmann Sa Metodo e dispositivo para extracao de moldes de cobre,de lingoteiras,no lingotamento continuo

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006015282A1 (de) * 2006-04-01 2007-10-04 Honeywell Technologies Sarl Ecc Kokille und Verfahren zum Gießen von Rotguss

Also Published As

Publication number Publication date
ATE138301T1 (de) 1996-06-15
GR3020284T3 (en) 1996-09-30
DE4036893A1 (de) 1992-05-21
DE4036893C2 (de) 1999-05-20
LU88041A1 (fr) 1992-07-07
EP0544931A1 (fr) 1993-06-09
DK0544931T3 (da) 1996-10-14
ES2087216T3 (es) 1996-07-16

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