EP0100290B1 - Procédé de coulée de métaux dans lequel on fait agir des champs magnétiques - Google Patents

Procédé de coulée de métaux dans lequel on fait agir des champs magnétiques Download PDF

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Publication number
EP0100290B1
EP0100290B1 EP83420125A EP83420125A EP0100290B1 EP 0100290 B1 EP0100290 B1 EP 0100290B1 EP 83420125 A EP83420125 A EP 83420125A EP 83420125 A EP83420125 A EP 83420125A EP 0100290 B1 EP0100290 B1 EP 0100290B1
Authority
EP
European Patent Office
Prior art keywords
field
magnetic field
frequency
metal
stationary
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
EP83420125A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0100290A3 (en
EP0100290A2 (fr
Inventor
Charles Vives
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.)
Cegedur Societe de Transformation de lAluminium Pechiney SA
Original Assignee
Cegedur Societe de Transformation de lAluminium 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 Cegedur Societe de Transformation de lAluminium Pechiney SA filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Priority to AT83420125T priority Critical patent/ATE16901T1/de
Publication of EP0100290A2 publication Critical patent/EP0100290A2/fr
Publication of EP0100290A3 publication Critical patent/EP0100290A3/fr
Application granted granted Critical
Publication of EP0100290B1 publication Critical patent/EP0100290B1/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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the present invention relates to a metal casting process in which magnetic fields are made to act in order to improve the structure and the surface condition of the products obtained.
  • the mold is filled with a known quantity of liquid metal and solidification takes place inside the mold by heat exchange with the wall of the latter.
  • the molten metal is poured into a mold generally having a vertical axis of symmetry, open at its two ends and whose side walls are cooled by a fluid.
  • the metal solidifies to form a crust which gradually thickens as the ingot progresses through the mold so that at the lower end of the mold its thickness is sufficient to retain the central part which is still liquid. .
  • the wall of the ingot is cooled directly by a spray of water and a complete solidification of the metallic mass is thus obtained fairly quickly.
  • the ingot obtained is very heterogeneous because it has both a cortical zone which has formed by rapid solidification on contact with the mold, and a central zone resulting from slower cooling by exchange with the wall of the mold or with water through the cortical area. These zones having crystallized at different speeds, do not have at all the same structure nor the same composition.
  • the skin of the ingot which has formed in contact with the mold is generally irregular. Also, it is most often required to subject ingots to additional scalping or peeling operations to eliminate disturbed areas and thus avoid the appearance of defects which would result during subsequent stages of processing of the ingot.
  • the invention relates to an apparatus for improving the structure and the physical and chemical homogeneity of the cast metal by controlling the solidification phenomenon.
  • This apparatus comprises, in combination, a plurality of external agitators operating independently, among which there are electromagnets and electromechanical vibration transducers arranged outside the mass of metal, regularly spaced apart and placed near the metal cooling zone, said stirrers producing a plurality of fields of stirring forces concentrated inside the metal.
  • Such a device including several types of devices of a rather complex design. although it reduces the phenomena of segregation inside the metal, does not solve the problems of surface finish.
  • EP-A-0 040383 teaches a method for agitating the non-solidified portion in a continuous casting, in which at least one static magnetic field and possibly an alternating magnetic field is produced which is produced by an agitator supplied with polyphase alternating current. It can be noted that these agitators are arranged on a limited portion of the wall of the mold and exert their field perpendicular to the pouring jet entering the bath.
  • the method according to the invention consists in causing a stationary magnetic field and a variable magnetic field to act simultaneously on the metal in the course of solidification and is characterized in that a uniform stationary magnetic field is created, of direction parallel to the axis. of the mold by means of at least one coil of contour similar to that of the upper part of the mold, a variable magnetic field of the same direction as the other field by means of at least one annular inductor supplied with single-phase alternating current.
  • the uniform magnetic field is created by at least one coil supplied with direct current.
  • This coil is constituted by an electric wire wound on a frame whose section by a horizontal plane has a contour similar to that of the upper section of the mold and it is placed above the mold.
  • this coil creates a uniform field of general direction parallel to the axis of symmetry of the mold, that is to say substantially vertical and oriented either downwards or upwards.
  • the lines of this field can be modified by incorporating inside the coil an iron core which follows its outline while leaving in its center sufficient space for the supply of liquid metal to the mold.
  • variable magnetic field is created by an annular inductor of similar geometry, but supplied with periodic current of frequency N.
  • This inductor is placed above the mold, either above the coil supplied with direct current, or between the latter and the mold.
  • the inductor creates a collinear variable field with the stationary field which produces in the metal an induced current.
  • the density vector is located in a generally horizontal plane and directed perpendicular to a straight line of this plane passing through the axis of the mold. All of these vectors therefore form concentric circles.
  • variable field due to the interaction of the variable field and the induced current both of frequency N, develops another radial force, also variable, but whose frequency is 2 N.
  • the metal is subjected to these two radial forces of frequency N and 2 N, from which results in a generalized vibration of the mass of liquid metal.
  • the periodic current which supplies the variable field inductor can have a purely sinusoidal shape, but any other shape is also suitable for carrying out the invention.
  • the frequency it can cover a whole range of values going from 5 to 100,000 hertz. However, a distinction should be made between the so-called low frequencies between 5 and 100 hertz and the higher, so-called medium frequencies.
  • variable field skin effect is reduced, that is to say that the induced current exerts its action on a thickness of metal such that there is sufficient interaction of this current with the stationary field to develop vibrations throughout the mass of metal.
  • the frequency of the variable field increases, the skin effect becomes significant and the interaction of the induced current with the stationary field becomes increasingly weak.
  • the vibrations emitted, to have a suitable efficiency can come into resonance with the proper vibrations of the liquid metal, of the dendrites being formed or of the solid mass.
  • these own vibrations depend on the format of the cast product. casting speed, nature of the metal, and cooling conditions. It will therefore be necessary to choose the frequency of the current as a function of the operating conditions, which can be deduced from the calculation or from measurements made using suitable sensors.
  • variable field has a frequency lower than 100 hertz
  • inductors with a decreasing frequency as the solidification progresses.
  • the skin effect is thus attenuated and the vibrations inside the ingot are developed.
  • FIG. 1 represents a vertical section passing through the axis of a continuous casting mold to which a variable field and a uniform field according to the invention are applied.
  • Figure 2 is a top view of the metal in the mold.
  • FIG. 1 there is a mold (1) cooled by a circulation of water (2) by means of which an ingot (4) is formed from a liquid metal (3).
  • the mold has been fitted on top of a coil (5) which creates a stationary field whose lines of force can be modified by the core (6).
  • an inductor (7) At the level of the mold is placed an inductor (7) which creates a variable field. Under the combined action of the fields, develops in the liquid of the vibra tions whose direction of propagation is represented by the arrows (8).
  • Figure 2 we see the drawing of the vibrating liquid metal in the directions (8).
  • the invention can be illustrated by means of the following non-limiting example.
  • the first part was carried out in a conventional ingot mold, then the casting was continued under the same conditions of speed and cooling, but by applying near the free surface of the metal, on the one hand, a stationary magnetic field of 0 , 04 tesla, created by means of an annular coil supplied by a direct current of 17500 ampere-turns, under a voltage of 24 volts, on the other hand, a variable magnetic field of frequency 50 hertz, created by a annular coil placed below the previous one, and at mold level and supplied with an alternating current of 3800 ampere-turns at a voltage of 75 volts.
  • the invention finds its application in all cases where it is sought to improve the structure and the surface condition of products molded or continuously cast, and in particular in the aluminum industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP83420125A 1982-07-23 1983-07-19 Procédé de coulée de métaux dans lequel on fait agir des champs magnétiques Expired EP0100290B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83420125T ATE16901T1 (de) 1982-07-23 1983-07-19 Verfahren zum giessen von metallen unter der einwirkung magnetischer felder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213219A FR2530511B1 (fr) 1982-07-23 1982-07-23 Procede de coulee de metaux dans lequel on fait agir des champs magnetiques
FR8213219 1982-07-23

Publications (3)

Publication Number Publication Date
EP0100290A2 EP0100290A2 (fr) 1984-02-08
EP0100290A3 EP0100290A3 (en) 1984-04-11
EP0100290B1 true EP0100290B1 (fr) 1985-12-11

Family

ID=9276425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420125A Expired EP0100290B1 (fr) 1982-07-23 1983-07-19 Procédé de coulée de métaux dans lequel on fait agir des champs magnétiques

Country Status (9)

Country Link
US (1) US4523628A (enrdf_load_stackoverflow)
EP (1) EP0100290B1 (enrdf_load_stackoverflow)
JP (1) JPS5935864A (enrdf_load_stackoverflow)
AT (1) ATE16901T1 (enrdf_load_stackoverflow)
AU (1) AU561201B2 (enrdf_load_stackoverflow)
CA (1) CA1203070A (enrdf_load_stackoverflow)
DE (1) DE3361490D1 (enrdf_load_stackoverflow)
FR (1) FR2530511B1 (enrdf_load_stackoverflow)
SU (1) SU1342406A3 (enrdf_load_stackoverflow)

Families Citing this family (17)

* 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
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
DE3819492A1 (de) * 1988-06-08 1989-12-14 Voest Alpine Ind Anlagen Knueppel- bzw. vorblock-stranggiesskokille
DE3829810A1 (de) * 1988-09-02 1990-03-15 Leybold Ag Verfahren und vorrichtung zum senkrechten abgiessen von metallschmelzen
US4933005A (en) * 1989-08-21 1990-06-12 Mulcahy Joseph A Magnetic control of molten metal systems
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
JPH0567683U (ja) * 1992-02-18 1993-09-07 株式会社イナックス 便器の保護構造
FR2718462B1 (fr) * 1994-04-11 1996-05-24 Pechiney Aluminium Alliages d'aluminium contenant du bismuth, du cadmium, de l'indium et/ou du plomb à l'état très finement dispersé et procédé d'obtention .
AU696830B2 (en) * 1995-07-19 1998-09-17 Bhp Steel (Jla) Pty Limited Method and apparatus for giving vibration to molten metal in a continuous casting machine
AUPN426095A0 (en) * 1995-07-19 1995-08-10 Bhp Steel (Jla) Pty Limited Method and apparatus for giving vibration to molten metal in twin roll continuous casting machine
IT1295164B1 (it) * 1997-07-10 1999-04-30 Danieli Off Mecc Procedimento di agitazione elettromagnetica per cristallizzatore e relativo cristallizzatore
FR2801523B1 (fr) * 1999-11-25 2001-12-28 Usinor Procede de coulee continue des metaux du type utilisant des champs electromagnetiques, et lingotiere et installation de coulee pour sa mise en oeuvre
US7255828B2 (en) * 2002-12-06 2007-08-14 Marcin Stanislaw Kasprzak Electromagnetic method and apparatus for treatment of engineering materials, products, and related processes
EP3038771B1 (en) 2013-08-29 2017-10-04 European Space Agency Manufacturing of a metal component or a metal matrix composite component involving contactless induction of high-frequency vibrations
JP2020521637A (ja) * 2017-05-24 2020-07-27 パイロテック インコーポレイテッド 電磁金属鋳造法
CN113194776B (zh) 2018-12-10 2024-05-28 波士顿材料公司 用于碳纤维对齐及纤维增强的复合材料的系统和方法
US11820880B2 (en) 2019-07-10 2023-11-21 Boston Materials, Inc. Compositions and methods for carbon fiber-metal and other composites

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944309A (en) * 1953-09-04 1960-07-12 Schaaber Otto Rotary field chill-mold
US2861302A (en) * 1955-09-09 1958-11-25 Ver Leichtmetallwerke Gmbh Apparatus for continuous casting
DE1807435A1 (de) * 1968-11-07 1970-10-01 Demag Ag Verfahren und Einrichtung zum Metall-,insbesondere Stahl-Stranggiessen
FR2448247A1 (fr) * 1979-01-30 1980-08-29 Cem Comp Electro Mec Inducteur electromagnetique destine a produire un champ helicoidal
SE436251B (sv) * 1980-05-19 1984-11-26 Asea Ab Sett och anordning for omrorning av de icke stelnade partierna av en gjutstreng

Also Published As

Publication number Publication date
JPS5935864A (ja) 1984-02-27
CA1203070A (fr) 1986-04-15
SU1342406A3 (ru) 1987-09-30
AU561201B2 (en) 1987-04-30
JPS645984B2 (enrdf_load_stackoverflow) 1989-02-01
US4523628A (en) 1985-06-18
ATE16901T1 (de) 1985-12-15
EP0100290A3 (en) 1984-04-11
DE3361490D1 (en) 1986-01-23
AU1716383A (en) 1984-01-26
FR2530511B1 (fr) 1985-07-05
FR2530511A1 (fr) 1984-01-27
EP0100290A2 (fr) 1984-02-08

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