EP0249565B1 - Vorrichtung zur Steuerung des Pegels der Kontaktlinie der freien Metalloberfläche mit der Stranggiesskokille in einen vertikalen Strangguss - Google Patents

Vorrichtung zur Steuerung des Pegels der Kontaktlinie der freien Metalloberfläche mit der Stranggiesskokille in einen vertikalen Strangguss Download PDF

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Publication number
EP0249565B1
EP0249565B1 EP87420069A EP87420069A EP0249565B1 EP 0249565 B1 EP0249565 B1 EP 0249565B1 EP 87420069 A EP87420069 A EP 87420069A EP 87420069 A EP87420069 A EP 87420069A EP 0249565 B1 EP0249565 B1 EP 0249565B1
Authority
EP
European Patent Office
Prior art keywords
level
mould
metal
casting
mold
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
EP87420069A
Other languages
English (en)
French (fr)
Other versions
EP0249565A1 (de
Inventor
Charles Vives
Jean-Pierre Riquet
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.)
Constellium Issoire SAS
Original Assignee
Cegedur Pechiney Rhenalu 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 Cegedur Pechiney Rhenalu SA filed Critical Cegedur Pechiney Rhenalu SA
Priority to AT87420069T priority Critical patent/ATE46284T1/de
Publication of EP0249565A1 publication Critical patent/EP0249565A1/de
Application granted granted Critical
Publication of EP0249565B1 publication Critical patent/EP0249565B1/de
Expired legal-status Critical Current

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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
    • B22D11/10—Supplying or treating molten metal
    • 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
    • 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

Definitions

  • the invention relates to a device for adjusting the level of the line of contact of the free surface of the metal with the ingot mold in a vertical casting according to the preambles of claims 1 and 2.
  • French patent 1,398,526 teaches the use of a strip of fiberfrax bonded to the ingot mold so as to reduce the height of the metal in contact with the ingot mold, and therefore to reduce the effects due to indirect cooling.
  • this reduction in height cannot be fixed once and for all, since it depends in particular on the speed of casting.
  • HAT TOP loaded casting with enhancement
  • This means consists in applying to the liquid in the course of solidification a periodic magnetic field of variable intensity and direction substantially parallel to the axis of the ingot mold and of adapting its intensity as a function of the desired level.
  • the advantage of such a method is therefore to allow the metal-ingot contact height and consequently the thickness of the cortical layer to be reduced at will simply with a coil supplied by a current of industrial frequency 50 or 60 Hz knowing that any electrical failure will only have the effect of varying the height of metal in the ingot mold, that is to say that any risk of leakage of liquid metal will be eliminated which is not the case in electromagnetic casting .
  • the presence of an ingot mold while limiting the possibility of oxidation of the liquid metal at the meniscus, prevents, by the contact it has with the metal, any displacement of the oxide film towards the side wall. and therefore any risk of tingling on the surface of the semi-finished product.
  • the field applied to the metal also has the effect of creating forces inside the liquid which homogenize the cooling and tend to cause a refinement of the pouring grain.
  • the coil which creates the magnetic field preferably has a shape close to that of the mold, so that it creates a direction field substantially parallel to the axis of the mold. It is arranged along this axis so that the zone where the field exerts a maximum action is located between the top of the liquid meniscus and the point of contact with the mold.
  • Such a method makes it possible, during a casting operation, to carry out a normal start-up under the best possible conditions, that is to say with a high height of metal in the ingot mold.
  • a field of low intensity and possibly zero is used so as to minimize any modification of the normal level of the metal.
  • the intensity of the field is increased until reaching a minimum height leading to a minimum thickness of the cortical layer.
  • the maximum value of the allowed field sible is easily detected by the appearance, when it is exceeded, of deformation of the surface of the cast product.
  • This value generally corresponds to the moment when the level reached by the contact line corresponds to the level at which the line of intersection between the solidification front due to indirect cooling and the solidification front due to direct cooling in conventional casting takes place.
  • the contact height is then practically reduced to a circular line and the cortical layer nonexistent.
  • FIG. 1 shows in vertical section two half-molds, the one on the left is used according to the prior art and the one on the right according to the process described above. .
  • an aluminum alloy of the type 2214 was poured according to the standards of the Aluminum Association, at the speed of 60 mm / minute.
  • the stopper adjusts the metal level halfway up the mold and the coolant comes into contact with the skin of the cast billet about 1 cm below the base of the mold.
  • the application of the method leads to a progressive reduction in the thickness of the cortical layer as the electric voltage at the terminals of the coil is increased in proportions such that this thickness becomes zero for a voltage of 180 volts.
  • the grain size decreases so that from a metal which has grains of 500 1 1m in conventional casting, there are obtained according to the invention grains of 180 1 1m on average.
  • This increase can be obtained by modifying the composition of the material constituting the devices to give it greater resistivity, or the structure of the devices to increase their resistance.
  • the two paths have been followed, one characterized in that one uses an ingot mold constituted by a solid material having a resistivity greater than 5 4 - cm, the other characterized in that one uses an ingot mold shared in the height direction in at least two sectors separated from each other by an electrical insulator.
  • the increase in resistivity for water boxes for example, is easy to obtain using materials such as stainless steels or fiber-reinforced resins, on the other hand, for ingot molds, the solution is less practical due to the traditional use of aluminum or copper, metals with very low resistivity ( ⁇ 3 ⁇ ⁇ cm).
  • the Applicant has found that it is possible to reduce the electrical voltage necessary for adjustment, while maintaining suitable casting conditions, by using materials belonging to the group consisting of ceramics, metals such as for example non-magnetic stainless steels, titanium.
  • the best solution is to use aluminum alloys with elements such as manganese, chromium, titanium, vanadium, which allow not too high concentrations to obtain relatively high solid solution contents and as a result of the higher resistivities.
  • an ingot mold is used such that it allows the electrical resistance to be increased.
  • This structure can be obtained by dividing the mold into sectors which are separated from each other by an electrical insulator and assembled by means known to those skilled in the art.
  • FIG. 2 shows in perspective such an ingot mold with a diameter of 320 mm and a height of 120 mm on which there are 4 sectors (15) separated over their entire height by a mica blade (16). These parts are kept assembled together by means of stainless steel pins (17) passing through the edge of the ingot mold and dowels (18) made of insulating material, all of these means being placed in the mass of the ingot mold. To obtain a suitable result, it has been found that it is however necessary to have sectors whose width is not too large. Thus widths between 10 and 30 cm have given the best results.
  • the ingot molds designed according to the invention have the result, when they are subjected to the action of a magnetic field created by an industrial current of frequency 50 to 60 Hz, obtaining cast products having both a cortical layer of very little or no thickness and a fine grain.
  • N 1 is chosen from the frequencies between 50 Hz and 1 kHz depending on the nature and geometry of the ingot mold and N 2 is at least of the order of Hz for cast products of very thick (from about 60 cm thick).
  • the present invention finds its application in the casting of metallurgical semi-products, in particular aluminum and its alloys, such as, for example, lithium alloys and in which it is desired to obtain both a cortical zone of practically zero thickness, a grain end without prior addition of refining agents such as AT5B and the absence of pins.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Pens And Brushes (AREA)

Claims (11)

1. Vorrichtung zur Steuerung des Niveaus der Kontaktlinie der freien Oberfläche des Metalls mit einer Gießform (3) bei einem Vertikalguß mittels wenigstens einer von einem periodischen elektrischen Strom durchflossenen und die Gießform umgebenden ringförmigen Spule (8),
dadurch gekennzeichnet,
daß man zwecks Verringerung der zur Steuerung erforderlichen elektrischen Spannung eine Gießform verwendet, die aus einem festen Material mit einem Widerstand über 5 µΩ · cm besteht.
2. Vorrichtung zur Steuerung des Niveaus der Kontaktlinie der freien Oberfläche des Metalls mit einer Gießform (3) bei einem Vertikalguß mittels wenigstens einer von einem periodischen elektrischen Strom durchflossenen und die Gießform umgebenden ringförmigen Spule (8),
dadurch gekennzeichnet,
daß man zwecks Verringerung der zur Steuerung erforderlichen elektrischen Spannung eine Gießform verwendet, die in der Richtung der Höhe in wenigstens zwei Sektoren (15) unterteilt ist, die untereinander durch einen elektrischen Isolierstoff (16) getrennt sind.
3. Vorrichtung nach dem Anspruch 1
dadurch gekennzeichnet,
daß das Material zur Gruppe gehört, die aus den Keramiken, den Metallen und Legierungen mit hohem Widerstand gebildet ist.
4. Vorrichtung nach dem Anspruch 1
dadurch gekennzeichnet,
daß das Material eine Aluminiumlegierung hohen Widerstands ist.
5. Vorrichtung nach dem Anspruch 4,
dadurch gekennzeichnet,
daß das Material eine Aluminiumlegierung der Gewichtszusammensetzung mit 1,8 % Mn, 0,25 % Cr, 0,2 % Ti, 0,1 % V und 5 % Mg ist.
6. Vorrichtung nach dem Anspruch 1
dadurch gekennzeichnet,
daß das Material ein Verbunderzeugnis ist.
7. Vorrichtung nach dem Anspruch 6,
dadurch gekennzeichnet,
daß das Material ein nichtoxidierbarer unmagnetischer Stahl ist, der innenseitig mit einer dünnen Aluminiumschicht überzogen ist.
8. Vorrichtung nach dem Anspruch 2,
dadurch gekennzeichnet,
daß die Sektoren eine Breite im Bereich von 1 0 bis 30 cm haben.
9. Vorrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die ringförmige Spule gleichzeitig an zwei Quellen elektrischen Stroms verschiedener Frequenz (N1 und N2) angeschlossen ist.
10. Vorrichtung nach dem Anspruch 9,
dadurch gekennzeichnet,
daß die eine der Quellen eine industrielle Frequenz (N1) hat und die andere eine Frequenz (N2) unterhalb (N1) hat.
11. Vorrichtung nach dem Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß sie zwei ringförmige Spulen aufweist, deren eine von einer Quelle einer industriellen Frequenz (N1) gespeist wird und deren andere von einer Quelle einer niedrigeren Frequenz (N2) gespeist wird.
EP87420069A 1986-03-13 1987-03-11 Vorrichtung zur Steuerung des Pegels der Kontaktlinie der freien Metalloberfläche mit der Stranggiesskokille in einen vertikalen Strangguss Expired EP0249565B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87420069T ATE46284T1 (de) 1986-03-13 1987-03-11 Vorrichtung zur steuerung des pegels der kontaktlinie der freien metalloberflaeche mit der stranggiesskokille in einen vertikalen strangguss.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8604118 1986-03-13
FR8604118A FR2595597B1 (fr) 1986-03-13 1986-03-13 Dispositif de reglage du niveau de la ligne de contact de la surface libre du metal avec la lingotiere dans une coulee verticale

Publications (2)

Publication Number Publication Date
EP0249565A1 EP0249565A1 (de) 1987-12-16
EP0249565B1 true EP0249565B1 (de) 1989-09-13

Family

ID=9333415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87420069A Expired EP0249565B1 (de) 1986-03-13 1987-03-11 Vorrichtung zur Steuerung des Pegels der Kontaktlinie der freien Metalloberfläche mit der Stranggiesskokille in einen vertikalen Strangguss

Country Status (10)

Country Link
US (1) US4723591A (de)
EP (1) EP0249565B1 (de)
JP (1) JPS62230459A (de)
KR (1) KR870008643A (de)
AT (1) ATE46284T1 (de)
AU (1) AU580525B2 (de)
DE (1) DE3760546D1 (de)
FR (1) FR2595597B1 (de)
GR (1) GR3000154T3 (de)
NZ (1) NZ219582A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609656B1 (fr) * 1987-01-15 1989-03-24 Cegedur Procede de reglage au niveau de la ligne de contact de la surface libre du metal avec la lingotiere dans une coulee verticale de produits de section quelconque
US4947925A (en) * 1989-02-24 1990-08-14 Wagstaff Engineering, Inc. Means and technique for forming the cavity of an open-ended mold
JPH04504228A (ja) * 1989-03-20 1992-07-30 オリン コーポレイション 鋳造時における溶融金属の鋳型―内部撹拌
US5246060A (en) * 1991-11-13 1993-09-21 Aluminum Company Of America Process for ingot casting employing a magnetic field for reducing macrosegregation and associated apparatus and ingot

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB752271A (en) * 1954-05-17 1956-07-11 Rossi Irving Improvements in moulds for use in the continuous casting of metals and particularly steel
AT303280B (de) * 1970-09-22 1972-11-27 Plansee Metallwerk Kokille für das Stranggießen von Metallen
GB1566819A (en) * 1977-09-13 1980-05-08 Inst Elektroswarki Patona Electroslag remelting and surfacing apparatus
GB2014487B (en) * 1978-02-18 1982-06-16 British Aluminium Co Ltd Varying metal-mould contact in continous casting
DE3009189B1 (de) * 1980-03-11 1981-08-20 Mannesmann Demag Ag, 4100 Duisburg Verfahren zum Horizontalstranggiessen von fluessigen Metallen,insbesondere von Stahl,und Einrichtung dazu
JPS589749A (ja) * 1981-07-10 1983-01-20 Nippon Kokan Kk <Nkk> 鋼の連続鋳造用鋳型
US4457354A (en) * 1981-08-03 1984-07-03 International Telephone And Telegraph Corporation Mold for use in metal or metal alloy casting systems
JPS5850157A (ja) * 1981-09-21 1983-03-24 Sumitomo Electric Ind Ltd 連続鋳造用鋳型
JPS5890352A (ja) * 1981-11-25 1983-05-30 Mitsubishi Heavy Ind Ltd 連続鋳造用鋳型内壁板及びその製造方法
FR2595596B1 (fr) * 1986-03-13 1988-04-29 Cegedur Lingotiere permettant de regler le niveau suivant lequel elle est en contact avec la surface libre du metal dans une coulee verticale

Also Published As

Publication number Publication date
FR2595597B1 (fr) 1988-04-29
NZ219582A (en) 1988-04-29
GR3000154T3 (en) 1990-11-29
JPS62230459A (ja) 1987-10-09
US4723591A (en) 1988-02-09
DE3760546D1 (en) 1989-10-19
AU6995587A (en) 1987-09-17
FR2595597A1 (fr) 1987-09-18
JPH0154150B2 (de) 1989-11-16
KR870008643A (ko) 1987-10-19
AU580525B2 (en) 1989-01-12
EP0249565A1 (de) 1987-12-16
ATE46284T1 (de) 1989-09-15

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