EP0846510B1 - Utilisation d'une coquille pour fabrication de bars en métal léger ou alliage léger, notamment de magnésium ou d'alliage de magnésium - Google Patents

Utilisation d'une coquille pour fabrication de bars en métal léger ou alliage léger, notamment de magnésium ou d'alliage de magnésium Download PDF

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Publication number
EP0846510B1
EP0846510B1 EP97120790A EP97120790A EP0846510B1 EP 0846510 B1 EP0846510 B1 EP 0846510B1 EP 97120790 A EP97120790 A EP 97120790A EP 97120790 A EP97120790 A EP 97120790A EP 0846510 B1 EP0846510 B1 EP 0846510B1
Authority
EP
European Patent Office
Prior art keywords
chill
melt
mold
light metal
chill according
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
EP97120790A
Other languages
German (de)
English (en)
Other versions
EP0846510A1 (fr
Inventor
Dieter Dr. Ing. Brungs
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.)
Honsel AG
Original Assignee
Honsel 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
Priority claimed from DE19710887A external-priority patent/DE19710887C2/de
Application filed by Honsel AG filed Critical Honsel AG
Publication of EP0846510A1 publication Critical patent/EP0846510A1/fr
Application granted granted Critical
Publication of EP0846510B1 publication Critical patent/EP0846510B1/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
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • 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

Definitions

  • the invention relates to the use of a mold for producing bars from light metal or with a light metal alloy, especially made of magnesium or a magnesium alloy a diameter of 60 to 400 mm.
  • the manufacture of light metal bars, especially magnesium bars, is carried out according to the current status the art usually by casting strands with a large diameter, preferably 400 up to 600 mm in diameter can be cast using known continuous casting processes, as they do for example, described in US-A-4 071 072.
  • the melt is broken down into a short water-cooled mold, and the strand emerging from the mold is sprayed cooled with water or by immersing in a water bath until completely solidified. Thereafter, machining of the surface of the cast strands to remove the Cast edge shell take place. Finally, the casting strand is extruded to the desired one Dimensions of the ingot brought.
  • Bars of light metal or a light metal alloy, in particular magnesium or one Magnesium alloy can be used for experimental purposes with conventional casting techniques, e.g. B. in Sand casting processes are produced.
  • the structural properties are extreme because of the low solidification speeds for further processing, especially extrusion unfavorable.
  • a one-off production requires a very high manual effort for the Mold production and further processing of the cast blank.
  • the casting blank must be and running system are freed and processed all round to the finished size for further processing become. Due to the large-volume sprue and riser system as well as the machining there is also a very low output in the order of magnitude for the sand casting process 50%.
  • the sand casting process is therefore not suitable for mass production of bars.
  • a sheet metal mold is described in US-A-2 264 456. It rests on a lowerable Table in a spray zone or a water bath. The mold has clamp elements for Hold / fix the free ends of the sheets. They are topped up to the same extent as the Casting table is lowered.
  • the invention is based on the problem of a method and an apparatus for producing Ingots, in particular pressed bars made of light metal or a light metal alloy, in particular made of Magnesium or a magnesium alloy, with a diameter of 60-400 mm, which is both for series production and for one-off production for small quantities and short-term coverage is suitable.
  • the ingots are said to be without further processing have the desired dimensions so that machining of the bar surfaces can be eliminated or reduced to a minimum.
  • the total output is supposed to about 80% and above.
  • an extruded metal mold made of aluminum or an aluminum alloy used Preferably, an extruded metal mold made of aluminum or an aluminum alloy used. Surprisingly, it has been shown that the cooling rate in one such a mold is so high that the cooling effect in still air due to the high Thermal conductivity of the mold material is completely sufficient and even for the production of bars made of aluminum and its alloys is suitable without the mold melting.
  • the mold can preferably be equipped with cooling fins be provided.
  • Such molds can be quickly extruded with any internal diameter or internal cross-section as well as with cooling fins, so that the manufactured by means of this mold Ingot already has the respective dimensions required for further processing, without that additional processing steps are required.
  • the inner surface of the metal mold can be provided with a conventional size, and as Chill material can be metals that can be formed by extrusion and one have high thermal conductivity. Aluminum or preferably therefore come for the mold Aluminum alloys in question.
  • the light metal or light metal alloy melt in particular the magnesium or Magnesium alloy melt, is from above into the extrusion profile used as a mold filled with rising metal mirror.
  • One serves as the lower end or bottom for the mold Metal plate, preferably a steel plate, which can also be cooled.
  • the metal is fed during to achieve metal feed without vortex and turbulence the casting always below the melt surface and preferably in such a way that a constant distance of a melt nozzle immersed in the melt from the Melt surface using a float by lowering the mold or lifting the Melt nozzle is set.
  • a quiet metal feed without vortex and turbulence can also be done without using a Floats can be achieved by lowering the mold or lifting the melt nozzle in Dependence of the mold filling speed is controlled so that the melt nozzle is always in the Melt remains immersed.
  • a light metal-resistant filter in the melt nozzle can also be a quiet metal feed cause and also reduces or avoids the introduction of oxides and / or Contamination in the mold.
  • the bars can easily be released remove the extruded profile used as the mold. That used as a mold Extruded profile does not require any rework and is immediately available for further use Available.
  • the mold is characterized by a very high output because of the necessary waste at most is limited to the lowest area of the ingot, where it is at the initial Filling the light metal or light metal alloy melt, in particular the magnesium or Magnesium alloy melt, there is turbulence and oxide inclusions and therefore alone must be separated if there are appropriate cleanliness requirements.
  • the rest of it Material up to the upper metal mirror can be used directly for further processing.
  • the surface of the cast blank can optionally be cleaned by blasting or even slightly machined to get a clean metallic surface, if appropriate
  • the light metal or light metal alloy melt in particular the magnesium or Magnesium alloy melt can also from below into the extrusion profile used as a mold be filled with rising metal levels. For this come z. B. the low pressure casting process or the gravity casting process with increasing mold filling in question.
  • the mold can be in one part or can be composed of several parts from extruded profile segments.
  • a float be provided, which controls the melt supply.
  • a light metal-resistant filter can be arranged in the melt nozzle.
  • Bars with a length corresponding to the height of the mold can be produced.
  • the Thermal insulation may be provided in the upper region of the mold.
  • This thermal insulation can be used as arranged on the inside and / or the outside of the mold in the upper area, heat-insulating coating can be formed.
  • a heat-insulating attachment can also be provided on the mold.
  • This essay can be made a piece of pipe made of molding sand, which preferably tapers conically upwards is exist.
  • An extruded mold 1 made of aluminum or an aluminum alloy has a tube wall 2 with an inner diameter corresponding to the desired diameter of the ingot and radial Cooling fins 3.
  • the mold 1 rests on a base plate 4 made of metal, and the whole of a lowering device 10 worn.
  • the bottom plate 4 can, as shown in Fig. 4, cooling channels 16 have.
  • a melt nozzle 6 protrudes into the mold 1 and consists of a light metal, especially magnesium-resistant material.
  • a float 7 stands with the nozzle 6 also made of light metal, especially magnesium-resistant material in combination, for this ensures that light metal or light metal alloy melt or the magnesium or Magnesium alloy melt 8 always at a uniform distance from one Melt surface 9 is introduced into the mold 1.
  • the lowering device 10 is lowered according to the casting speed until the mold is filled with molten metal.
  • the melt is cooled in still air.
  • the mold can also be used as a smooth tube without cooling fins be trained.
  • bars with a height corresponding to the mold can be produced Create length.
  • FIG. 3 shows an existing of mold segments 11 Mold, in the tube wall 12 channels 13 are arranged.
  • outer cooling fins 14 shown.
  • the mold consists of four mold segments 11, which, for. B. are positively connected to one another by means of a dovetail connection 15, however the mold can also consist of fewer or more mold segments.
  • this can be treated with a conventional size.
  • the cross section of the mold can be circular, as shown, but can also be other Have cross-sectional shapes.
  • the cooling rate on the wall 2 of the mold is so great that that of aluminum or an aluminum alloy extruded mold 1 also for the production of bars from aluminum or an aluminum alloy is suitable.
  • a light metal-resistant filter 17 can be used to control the mold filling speed between the float 7 and the melt nozzle 6 or as shown in FIG. 6 instead of the float the melt nozzle 6 may be arranged. This allows the introduction of oxides and others Reduce or even avoid contamination in the melt.
  • a heat-insulating coating 18, 19 may be applied in the upper area of the ingot.
  • the same purpose can also be achieved by an attachment 20 shown in FIG Reach conical pipe piece made of molding sand, which alone or in addition to the coating 18, 19 in FIG. 7 forms the thermal insulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Extrusion Of Metal (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (15)

  1. Utilisation d'une coquille (1) de forme tubulaire, extrudée, exposée uniquement à de l'air au repos, en métal d'une grande conductibilité thermique avec un diamètre intérieur ou section intérieure correspondant au diamètre ou à la section voulue d'une barre à réaliser, une plaque de fond (4) fermant la coquille (1), et une longueur correspondant à la longueur voulue de la barre, pour la fabrication de billettes en métal léger ou en un alliage léger, notamment en magnésium ou un alliage de magnésium, d'un diamètre de 60 à 400 mm.
  2. Utilisation d'une coquille selon la revendication 1, avec ailettes de refroidissement sur la surface extérieure.
  3. Utilisation d'une coquille selon la revendication 1 ou 2, en aluminium ou alliage d'aluminium.
  4. Utilisation d'une coquille selon la revendication 2 ou 3, qui est en plusieurs parties et composée de segments profilés extrudés (il).
  5. Utilisation d'une coquille selon la revendication 1, 2, 3 ou 4 avec un fond fait d'une plaque métallique (4) servant de support à la coquille (1 ; 11).
  6. Utilisation d'une coquille selon la revendication 5, dans laquelle la plaque métallique (4) peut être refroidie.
  7. Utilisation d'une coquille selon l'une des revendications 1 à 6, avec une isolation thermique (18, 19, 20) dans la région supérieure.
  8. Utilisation d'une coquille selon la revendication 7, avec un revêtement (18, 19) isolant thermiquement sur la face intérieure et/ou la face extérieure de la région supérieure.
  9. Utilisation d'une coquille selon la revendication 7 ou 8, avec un chapeau (20) isolant thermiquement sur la région supérieure.
  10. Utilisation d'une coquille selon la revendication 9, dans laquelle le chapeau (20) isolant thermiquement est constitué d'une pièce tubulaire en sable de moulage.
  11. Utilisation d'une coquille selon la revendication 10, dans laquelle la pièce tubulaire (20) se rétrécit coniquement vers le haut.
  12. Utilisation d'une coquille selon l'une des revendications 1 à 11, dans laquelle le métal en fusion peut toujours être amené au-dessous de sa surface (9) au moyen d'une buse de fusion (6) pendant la coulée.
  13. Utilisation d'une coquille selon la revendication 12, dans laquelle une distance constante de la buse de fusion (6), immergée dans le métal en fusion, par rapport à sa surface (9), peut être réglée au moyen d'un flotteur (7), par abaissement de la coquille (1) ou relèvement de la buse de fusion (6).
  14. Utilisation d'une coquille selon l'une ou plusieurs des revendications 10 à 13, avec une fixation pour la coquille (1; 11) et un dispositif d'abaissement (10) pour la plaque métallique (4).
  15. Utilisation d'une coquille selon l'une des revendications 1 à 14, dans laquelle le métal en fusion peut être amené au moyen d'une buse de fusion (6) pourvue d'un filtre (17) résistant au métal léger.
EP97120790A 1996-12-03 1997-11-27 Utilisation d'une coquille pour fabrication de bars en métal léger ou alliage léger, notamment de magnésium ou d'alliage de magnésium Expired - Lifetime EP0846510B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19650074 1996-12-03
DE19650074 1996-12-03
DE19710887A DE19710887C2 (de) 1996-12-03 1997-03-15 Verwendung einer Kokille zum Herstellen von Barren aus Leichtmetall oder einer Leichtmetallegierung, insbesondere aus Magnesium oder einer Magnesiumlegierung
DE19710887 1997-03-15

Publications (2)

Publication Number Publication Date
EP0846510A1 EP0846510A1 (fr) 1998-06-10
EP0846510B1 true EP0846510B1 (fr) 2001-05-23

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Application Number Title Priority Date Filing Date
EP97120790A Expired - Lifetime EP0846510B1 (fr) 1996-12-03 1997-11-27 Utilisation d'une coquille pour fabrication de bars en métal léger ou alliage léger, notamment de magnésium ou d'alliage de magnésium

Country Status (3)

Country Link
EP (1) EP0846510B1 (fr)
JP (1) JPH10166136A (fr)
AT (1) ATE201343T1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4993874B2 (ja) * 2005-05-06 2012-08-08 京セラ株式会社 シリコンインゴット用の鋳型

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2264456A (en) * 1937-05-12 1941-12-02 Ver Leichtmetallwerke Gmbh Method of casting metals
US3338296A (en) * 1964-04-02 1967-08-29 Aluminum Co Of America Method of casting aluminum
US4071072A (en) * 1973-11-06 1978-01-31 Alcan Research And Development Limited Method of direct chill casting of aluminum alloys
DE3218100A1 (de) * 1982-05-13 1983-11-17 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren zur herstellung einer rohrkokille mit rechteckigem bzw. quadratischem querschnitt
DE3514123C2 (de) * 1985-04-19 1994-12-08 Kabelmetal Ag Verfahren zur Herstellung von Durchlaufkokillen für Stranggießmaschinen

Also Published As

Publication number Publication date
JPH10166136A (ja) 1998-06-23
EP0846510A1 (fr) 1998-06-10
ATE201343T1 (de) 2001-06-15

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