EP0083611B1 - Procede de coulee continue verticale a grande vitesse de l'aluminium et de ses alliages - Google Patents

Procede de coulee continue verticale a grande vitesse de l'aluminium et de ses alliages Download PDF

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Publication number
EP0083611B1
EP0083611B1 EP82902070A EP82902070A EP0083611B1 EP 0083611 B1 EP0083611 B1 EP 0083611B1 EP 82902070 A EP82902070 A EP 82902070A EP 82902070 A EP82902070 A EP 82902070A EP 0083611 B1 EP0083611 B1 EP 0083611B1
Authority
EP
European Patent Office
Prior art keywords
speed
process according
vertical
casting
riser
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
EP82902070A
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German (de)
English (en)
French (fr)
Other versions
EP0083611A1 (fr
Inventor
Yves Cans
Richard Gonda
Marc Tavernier
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0083611A1 publication Critical patent/EP0083611A1/fr
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    • 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould

Definitions

  • the present invention relates to a process for continuous vertical casting at high speed of aluminum and its alloys, in particular in the form of billets and plates of which the smallest dimension does not exceed 150 mm.
  • Another way of reducing the appearance of defects on the surface of the cast products is to carry out the molding without contact with an ingot mold. This is achieved by passing the liquid metal through the center of an inductor which creates an electromagnetic field and thus generates forces which help to give the liquid a defined shape. This shape is then maintained by solidifying the metal by direct watering by means of a heat transfer fluid.
  • the object of the holder with the aim of achieving the casting of billets or plates the smallest dimension of which does not exceed 150 mm at a speed greater than those achieved so far, has sought and developed a process which makes it possible to to overcome the difficulties which have just been pointed out.
  • This continuous vertical casting process combines the use of a riser for the supply of liquid metal, an electromagnetic inductor and a direct cooling device for setting in the shape of the product to be manufactured. It is characterized in that, in order to flow at a speed greater than 500 mm / min, the position of the riser is adjusted by a vertical movement relative to the inductor which creates the field so as to maintain during casting a constant distance between the base plane of the riser and the plane passing through the solidification front at the periphery of the cast product.
  • the holder uses a conventional riser with a cross-section similar to that of the cast product, open at its two ends and in which the liquid metal is brought to a certain height by means of an appropriate feeding system.
  • this enhancement and disposed approximately at its level, there is an annular cooling device which sprinkles the product cast over its entire periphery at a distance from the base plane of the riser such that solidification begins below this plane, and that an area of unconfined liquid remains over the entire section of the poured product.
  • solidification begins at the periphery of the product along a line contained in a plane generally perpendicular to the axis of the flow if the cooling device is properly placed, and it propagates in an approximately symmetrical and progressive manner. inward and downward of the product until the contact between the liquid and solid phases is reduced, at a greater or lesser distance from the extension, to a point or to a straight portion depending on the section of the product sunk. The boundary between the phases is called the solidification front.
  • the licensee resolved this problem by adjusting the position of the riser by vertical movement with respect to the inductor so as to maintain a constant distance between the base plane of the riser and the plane passing through the solidification front at the periphery. of the poured product.
  • Such an adjustment makes it possible, in fact, when the front tends to move away from the riser, to maintain the zone of unconfined liquid at a height compatible with a regular geometry of the product. This height is kept below 15 mm and preferably 10 mm without ever being zero, in which case solidification would then take place inside the riser and would lead to the appearance of a poor surface condition.
  • the position of the riser being thus linked to that of the forehead, it is first necessary to locate the latter. This location can be done with any means known to those skilled in the art, for example probes, or by using mathematical relationships which give the position of the front relative to the point of impact of the water as a function of the casting speed. Then we adjust the position of the extension by moving it vertically using any system that can be controlled by identifying the position of the front.
  • the licensee also found that the movement of the riser could be combined with movement of the cooling device.
  • the solidification front is established at a constant distance above the impact zone; we can therefore adjust the position of the forehead by adjusting the displacement of the cooling device.
  • the front is going down; if the acceleration is low, it remains close to the equilibrium conditions and the solidification front can be maintained by leaving the cooling device stationary; on the other hand, if the acceleration is great, the system is unbalanced and it is forced to move the cooling device down to avoid watering the liquid area.
  • the upper limit of the area sprayed by the fluid of the device is located at a distance from the front of between 1 and 6 mm.
  • the device can be gradually raised to bring the forehead up to a position close to the middle of the inductor which is the most favorable for casting.
  • the riser having been lowered, as we saw above, to maintain the area of unconfined liquid at a constant height, we can now reassemble it by following the movement of the forehead upwards. We thus gradually find the initial positions of the riser and the cooling device and we can again accelerate.
  • the movement of the device can here also be obtained by any suitable means.
  • the distance settings indicated above are fairly precise and therefore require well-defined impact zones. This is achieved by means of a device delivering peripheral water blades, of thickness less than 1 mm, making a small angle with the vertical and between 10 and 30 °. It is also necessary to propel the fluid at a high speed so as to avoid the phenomena of caléfaction; in general, sufficient pressure is applied to have at least 1 m / s.
  • This stage can include any device for distributing slides and droplets. However, the demands on impact accuracy are lower.
  • the level of liquid in the riser may vary so as to have a height of between 20 and 80 mm above the solidification front, at the periphery of the product.
  • the nozzle / float system maintains the level of liquid metal 10 at a suitable height while the movement of the riser and of the cooling device is controlled, so as to sprinkle the product poured immediately below the front, and to raise the latter regardless of the casting speed at the middle of the inductor and to maintain a constant distance between the base plane of the riser and said front.
  • a 120 mm billet was poured diameter of an aluminum alloy 5754 at a speed of 900 mm / min by maintaining, between the base plane of the riser and the plane passing through the solidification front, a distance of 13 mm and, between the upper limit from the watered area and the solidification front, a distance of 1 mm.
  • the height of the liquid metal above the solidification front located at the periphery of the product varied between 30 and 50 mm.
  • a cooling system delivering 4 m 3 / h of water in the form of a blade of thickness 0.7 mm inclined at 15 ° to the vertical, circulating at a speed of 2.5 m / s, an inductor supplied with a voltage of 18 V with an intensity of 6300 A having a frequency of 2000 Hz, an additional cooling device delivering 15 m 3 / h of water in the form of two blades of thickness 1 mm inclined at 45 ° with respect to the vertical, circulating at a speed of 3.2 m / s, a 100 x plate was poured 200 mm of an aluminum alloy 1050 at a speed of 960 mm / min while maintaining, between the base plane of the extension and the plane passing through the solidification front, a distance of 8 mm and, between the upper limit from the watered area and the solidification front, a distance of 2 to 3 mm.
  • a cooling device delivering 17 m 3 / h of water in the form of a 0.7 mm thick blade inclined at 15 ° with respect to the vertical, circulating at a speed of 2.4 m / s, an inductor supplied with a voltage of 19 V with an intensity of 5900 A having a frequency of 2000 Hz, an additional cooling device delivering 80 m 3 / h in the form of four blades of thickness 1 mm inclined at 45 ° with respect to the vertical, circulating at a speed of 2.0 m / s, a plate of 100 ⁇ 1300 mm of an alloy was poured of aluminum 1050 at a speed of 780 mm / min maintaining, between the base plane of the extension and the plane passing through the solidification front, a distance of 14 mm and, between the upper limit of the watered area and the solidification front, a distance of 4 mm.
  • the present invention makes it possible to continuously cast aluminum and its alloys at speeds greater than 500 mm / min, in the form of billets or plates of which the smallest dimension does not exceed 150 mm and which have a surface requiring no scalping treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP82902070A 1981-07-09 1982-07-07 Procede de coulee continue verticale a grande vitesse de l'aluminium et de ses alliages Expired EP0083611B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114037 1981-07-09
FR8114037A FR2509207A1 (fr) 1981-07-09 1981-07-09 Procede de coulee continue verticale a grande vitesse de l'aluminium et de ses alliages

Publications (2)

Publication Number Publication Date
EP0083611A1 EP0083611A1 (fr) 1983-07-20
EP0083611B1 true EP0083611B1 (fr) 1985-03-20

Family

ID=9260641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82902070A Expired EP0083611B1 (fr) 1981-07-09 1982-07-07 Procede de coulee continue verticale a grande vitesse de l'aluminium et de ses alliages

Country Status (18)

Country Link
US (1) US4523627A (ja)
EP (1) EP0083611B1 (ja)
JP (1) JPS58500939A (ja)
AU (1) AU547447B2 (ja)
BR (1) BR8207785A (ja)
CA (1) CA1178780A (ja)
DE (1) DE3262654D1 (ja)
ES (1) ES8305608A1 (ja)
FR (1) FR2509207A1 (ja)
GB (1) GB2103972B (ja)
GR (1) GR69780B (ja)
IN (1) IN156297B (ja)
IT (1) IT1151818B (ja)
NO (1) NO830653L (ja)
RO (1) RO87316B (ja)
SU (1) SU1178315A3 (ja)
WO (1) WO1983000107A1 (ja)
YU (1) YU145382A (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570304B1 (fr) * 1984-09-19 1986-11-14 Cegedur Procede de reglage du niveau de la ligne de contact de la surface libre du metal avec la lingotiere dans une coulee verticale
US5085265A (en) * 1990-03-23 1992-02-04 Nkk Corporation Method for continuous casting of molten steel and apparatus therefor
US5469911A (en) * 1994-04-12 1995-11-28 Reynolds Metals Company Method for improving surface quality of electromagnetically cast aluminum alloys and products therefrom
JP3696844B2 (ja) * 2002-07-08 2005-09-21 九州三井アルミニウム工業株式会社 半溶融成型性に優れたアルミニウム合金
EP1486347A1 (en) * 2003-06-12 2004-12-15 Fuji Photo Film B.V. Aluminium alloy substrate for lithographic printing plate and method for producing the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1491864A (en) * 1973-11-06 1977-11-16 Alcan Res & Dev Continuous casting
GB2014068A (en) * 1978-02-13 1979-08-22 Olin Corp Casting molten metals
CA1123897A (en) * 1978-07-03 1982-05-18 John C. Yarwood Electromagnetic casting method and apparatus
US4161978A (en) * 1978-07-19 1979-07-24 Reynolds Metals Company Ingot casting
US4236570A (en) * 1979-01-08 1980-12-02 Olin Corporation Ingot shape control by dynamic head in electromagnetic casting

Also Published As

Publication number Publication date
AU547447B2 (en) 1985-10-17
JPS58500939A (ja) 1983-06-09
RO87316A (ro) 1985-08-31
SU1178315A3 (ru) 1985-09-07
CA1178780A (fr) 1984-12-04
ES513801A0 (es) 1983-04-16
IN156297B (ja) 1985-06-15
YU145382A (en) 1986-04-30
GR69780B (ja) 1982-07-07
RO87316B (ro) 1985-08-31
EP0083611A1 (fr) 1983-07-20
ES8305608A1 (es) 1983-04-16
GB2103972B (en) 1985-01-09
GB2103972A (en) 1983-03-02
IT8222215A0 (it) 1982-07-02
IT1151818B (it) 1986-12-24
DE3262654D1 (en) 1985-04-25
IT8222215A1 (it) 1984-01-02
WO1983000107A1 (en) 1983-01-20
FR2509207A1 (fr) 1983-01-14
FR2509207B1 (ja) 1983-11-10
AU8681282A (en) 1983-02-02
NO830653L (no) 1983-02-24
BR8207785A (pt) 1983-06-21
US4523627A (en) 1985-06-18

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