EP0351327A1 - Verfahren zur Herstellung von thixotropen metallischen Produkten mittels Strangguss - Google Patents

Verfahren zur Herstellung von thixotropen metallischen Produkten mittels Strangguss Download PDF

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Publication number
EP0351327A1
EP0351327A1 EP89420240A EP89420240A EP0351327A1 EP 0351327 A1 EP0351327 A1 EP 0351327A1 EP 89420240 A EP89420240 A EP 89420240A EP 89420240 A EP89420240 A EP 89420240A EP 0351327 A1 EP0351327 A1 EP 0351327A1
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EP
European Patent Office
Prior art keywords
cold zone
zone
mold
axis
wall
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.)
Granted
Application number
EP89420240A
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English (en)
French (fr)
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EP0351327B1 (de
Inventor
Jean-Luc Meyer
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
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Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT89420240T priority Critical patent/ATE72527T1/de
Publication of EP0351327A1 publication Critical patent/EP0351327A1/de
Application granted granted Critical
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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
    • 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
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S164/00—Metal founding
    • Y10S164/90—Rheo-casting

Definitions

  • This invention relates to a process for the production by continuous casting of thixotropic metal products.
  • metal products means any product of elongated shape having a circular or polyhedral cross section constituted by a metal such as aluminum for example or one of its alloys.
  • thixotropic metal product is meant any metal composition having a non-dendritic primary solid phase and more particularly a phase with dendrites degenerated to such an extent that it is in the form of substantially spheroidal particles.
  • thixotropic products provide significant advantages over conventional products during their shaping. This is how the energy required for this operation is much lower, the cooling time is shorter, the shrinkage formed has reduced dimensions and the erosive action of the metal with respect to the dies or shaping molds. is significantly reduced.
  • the metal is poured liquid in a mold provided at one of its ends with a movable bottom and consisting of two adjacent parts of the same axis which, according to the direction of the pouring, form an upstream part called hot zone whose wall is made of a material heat insulator at least on its internal face and a downstream part known as the cold zone, the wall of which is made, at least partially, of a heat-conducting material and where the external surface is cooled by a frigopor fluid so as to cause by solidification within the liquid that said part contains, the appearance of crystals and the formation on contact of the internal surface of a solid crust sufficiently rigid to allow the gradual extraction of the product thus formed on using the movable floor, this process being characterized in that a movement is imparted to the liquid in the course of solidification ensuring at least one transfer from the cold zone to the
  • the invention consists in introducing a liquid metal into a mold composed of an upstream part constituted by a material having heat-insulating properties at least as regards its wall in contact with the metal.
  • This material can be, for example, of the type of those which are commonly used in foundry for the manufacture of chutes or nozzles. Due to the reduced heat exchanges which take place in this part, the metal maintains itself normally, that is to say without any external disturbance, at a temperature sufficient for no crystallization to occur. Hence the designation of this part by the expression "hot zone".
  • This upstream part is connected by means of a suitable joint to a downstream part which, unlike the previous one, is very good conductor of heat at least over a portion of its height located most downstream and which, because of its ability to easily evacuate the calories from the metal it contains to the outside is called the "cold zone".
  • This part is the analog of the ingot mold in a conventional continuous casting and it is within it that the crystallization process is initiated and that from the wall cooled externally cooled by a coolant fluid a crystalline envelope sufficiently rigid to allow progressive extraction using the movable bottom of the cast product, while inside this envelope delimited by the "solidification front", surface having the general profile of a meniscus whose apex is oriented towards the 'downstream, a "swamp" is formed, consisting of a mixture of liquid and generally dendritic solid particles, particles which will gradually integrate into the solidification front and allow the solid part to develop and the flow to progress.
  • the movement of the particles takes place in at least loops, the assembly of which generates a torus with an axis substantially coincident with the axis of the mold.
  • These loops are located in meridian planes of the mold, that is to say passing through its axis, and each is entirely contained in the half-plane limited by said axis.
  • the portion of the loop along which the liquid passes from the cold zone to the hot zone is closest to the axis, the portion corresponding to the return being close to the wall of the mold.
  • two types of means are used: One of them is to pass a single-phase electric current of frequency less than or equal to the industrial frequency within the downstream part of the mold which is known to be made at least partially by an electrically conductive material .
  • the wall of this part must have over its entire thickness and along at least one generator an insert of material insulating from electricity on either side of which are fixed current leads.
  • this part plays the role of whorl and the current which crosses it generates a magnetic field which develops electromagnetic forces generating the desired movement.
  • the internal wall of this part must be covered with an electrically insulating film so that there is no electrical continuity between said metal part and the cast metal because if this were the case it would cause a short circuit and would prevent the development of the magnetic field conducive to movement.
  • the electromagnetic forces being a function of the intensity of the current flowing in the turn, preferably used for making the downstream part of metals of low electrical resistivity but mechanical strength nevertheless compatible with the cast metal. It can be, for example, copper or aluminum and their alloys in the case where aluminum is poured.
  • the insulating film may consist of an oxide layer obtained by anodization in the case of aluminum or an enamel, or even a fluorocarbon resin for example.
  • the thickness of this film is a function of the electrical voltage under which the wall is located relative to the cast metal. We can use an oxide thickness of 1 ⁇ m for a voltage of 100 volts.
  • the downstream parts thus formed can be fitted on their internal face with a graphite ring a few millimeters thick which plays the role of lubricant with respect to the cast metal and can amplify the role of a lubricating agent with which it is sometimes necessary to coat the inner wall of the downstream part to facilitate the casting of certain metals.
  • This ring can be divided according to its generators in at least two sectors to avoid not only any Joule effect in the zone where on the contrary it is desired to cool, but also a reduction in energy which would limit the movement of the metal.
  • the other means of producing the movement of the liquid within the mold consists in placing at the outside of the downstream part of the mold at least one metal coil of axis substantially parallel to the axis of the mold and having it pass through by a single-phase current of frequency less than or equal to the industrial frequency.
  • This turn electrically insulated from the wall of said part in fact creates a magnetic field parallel to the axis of the mold which develops electromagnetic forces generating the desired movement.
  • this movement is more or less wide and a function of the intensity admitted in the turn, but it also depends on other factors such as the composition of the material constituting the wall of the cold zone or the structure of said wall.
  • a material having a resistivity greater than 5 ⁇ .cm it is preferable to use a material having a resistivity greater than 5 ⁇ .cm. It may for example be a non-magnetic stainless steel or titanium or else a ceramic provided that it has sufficient thermal conductivity.
  • the best solution not to break with the habits of the profession is to use aluminum but in the form of an alloy containing by weight about 1.8% Mn; 0.25% Cr; 0.2% Ti and 0.1% V whose resistivity is equal to 9.3 ⁇ .cm instead of less than 3 ⁇ .cm for conventional alloys.
  • This resistivity can however be increased by adding Mg up to 5% in which case, values are reached from 11 to 12 ⁇ .cm.
  • the addition of Li up to 1% or Zr up to 0.15% is also favorable.
  • the wall of the cold zone is divided along its generators into at least two sectors separated from each other by an electrical insulator such as mica, said sectors being kept assembled together by means of stainless steel pins and insulating dowels.
  • All these types of embodiment of the downstream part can also be lined on their internal wall and in the vicinity of the hot zone with a coaxial graphite ring preferably shared along its generatrices in at least two sections, all these particularities always having the aim to improve the efficiency of the electric current in its transformation into electromagnetic forces generating movement.
  • All the turns which surround the downstream part of the mold are designed and mounted so as to be able to adapt to any form of downstream part and to best respond to obtaining both optimum current-force performance. and a distribution of force within the metal which ensures movement of the liquid over the entire section and the entire height of the mold in order to cause the greatest possible degeneration of the dendrites on the greatest possible number of crystals.
  • the cold zone may be surrounded by magnetic yoke elements formed from metal sheets electrically isolated from one another and situated in planes passing through it. mold axis.
  • the cooling of the cold zone is obtained as is known either by means of fluid boxes integrated into the external wall of said zone or by direct application of a peripheral fluid blade on said wall.
  • the fluid is adjusted in flow and / or in temperature while modifying in the case of direct cooling the impact surfaces of the fluid blade.
  • the hot zone or at least its part closest to the cold zone can be surrounded by a sheath in which circulates a gas under pressure and chemically inert with respect to the cast metal because under these conditions it is found that the cast product then presents a better surface appearance.
  • FIG. 1 represents a vertical half-section passing through the axis of a mold applicable to the invention.
  • an upstream part 1 made of a heat insulating material which encloses the liquid metal 2 and forms the hot zone
  • a downstream part 3 made of heat conducting material fitted internally with a graphite ring 4 and cooled externally by a film 5 of water from a supply box 6 which forms the cold zone.
  • the metal solidifies along the front 7 to give the product 8 cast.
  • a coil 9 supplied with alternating current surrounds the cold zone and creates a magnetic field which induces electromagnetic forces so that the liquid metal moves along arrow 10 parallel to the axis of the mold towards the hot zone and returns to the cold zone along the wall of the mold according to arrow 11 causing in its movement the particles 12.
  • An example of a structure obtained at the heart of the billet examined by micrography see fig. 2 under magnification 50) makes it possible to appreciate the effectiveness of the process in obtaining a structure with degenerate dendrites.
  • An alloy 2124 (according to the standards of the Aluminum Association) was cast in the form of a billet with a diameter of 400 mm according to the method described.
  • the overall design of the tool was similar to that described in the previous example, with the exception of the current flow; in this case, it was operated through a whorl independent of the downstream part.
  • the casting speed was 40 mm / min, which is conventionally used for this billet diameter. After micrographic examination, it was found that with the exception of a peripheral zone of the order of 15 mm, the structure of the grains was particularly rounded, practically without dendrite arms and of very fine size, from the 'around 70 ⁇ m.
EP89420240A 1988-07-07 1989-07-05 Verfahren zur Herstellung von thixotropen metallischen Produkten mittels Strangguss Expired - Lifetime EP0351327B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89420240T ATE72527T1 (de) 1988-07-07 1989-07-05 Verfahren zur herstellung von thixotropen metallischen produkten mittels strangguss.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809616A FR2634677B1 (fr) 1988-07-07 1988-07-07 Procede de fabrication par coulee continue de produits metalliques thixotropes
FR8809616 1988-07-07

Publications (2)

Publication Number Publication Date
EP0351327A1 true EP0351327A1 (de) 1990-01-17
EP0351327B1 EP0351327B1 (de) 1992-02-12

Family

ID=9368462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420240A Expired - Lifetime EP0351327B1 (de) 1988-07-07 1989-07-05 Verfahren zur Herstellung von thixotropen metallischen Produkten mittels Strangguss

Country Status (12)

Country Link
US (1) US4964455A (de)
EP (1) EP0351327B1 (de)
JP (1) JPH0255650A (de)
AT (1) ATE72527T1 (de)
AU (1) AU609690B2 (de)
CA (1) CA1334474C (de)
DE (1) DE68900825D1 (de)
ES (1) ES2029382T3 (de)
FR (1) FR2634677B1 (de)
GR (1) GR3003797T3 (de)
NO (1) NO170796C (de)
NZ (1) NZ229804A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2656552A1 (fr) * 1990-01-04 1991-07-05 Pechiney Aluminium Procede de fabrication de produits metalliques thixotropes par coulee continue avec brassage electromagnetique en courant polyphase.
FR2758101A1 (fr) * 1997-01-09 1998-07-10 Charles Vives Procede d'affinage par effet de cavitation electromagnetique de la microstructure des metaux et alliages coules en charge par la technique "hot top"
FR2761624A1 (fr) * 1997-04-07 1998-10-09 Charles Vives Procede magnetomecanique d'affinage par effet de cavitation de la structure cristalline des metaux et alliages coules en charge par la technique "hot-top"
AU715447B2 (en) * 1996-03-20 2000-02-03 Aluminium Pechiney Thixotropic aluminium-silicon-copper alloy for forming in the semisolid state

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2772765B2 (ja) * 1994-10-14 1998-07-09 本田技研工業株式会社 チクソキャスティング用鋳造材料の加熱方法
US5911843A (en) * 1995-04-14 1999-06-15 Northwest Aluminum Company Casting, thermal transforming and semi-solid forming aluminum alloys
US5571346A (en) * 1995-04-14 1996-11-05 Northwest Aluminum Company Casting, thermal transforming and semi-solid forming aluminum alloys
US5968292A (en) * 1995-04-14 1999-10-19 Northwest Aluminum Casting thermal transforming and semi-solid forming aluminum alloys
US5881796A (en) * 1996-10-04 1999-03-16 Semi-Solid Technologies Inc. Apparatus and method for integrated semi-solid material production and casting
US5887640A (en) 1996-10-04 1999-03-30 Semi-Solid Technologies Inc. Apparatus and method for semi-solid material production
WO2000005015A1 (en) 1998-07-24 2000-02-03 Gibbs Die Casting Aluminum Corporation Semi-solid casting apparatus and method
US6428636B2 (en) 1999-07-26 2002-08-06 Alcan International, Ltd. Semi-solid concentration processing of metallic alloys
US6269537B1 (en) 1999-07-28 2001-08-07 Methode Electronics, Inc. Method of assembling a peripheral device printed circuit board package
US6964199B2 (en) * 2001-11-02 2005-11-15 Cantocor, Inc. Methods and compositions for enhanced protein expression and/or growth of cultured cells using co-transcription of a Bcl2 encoding nucleic acid
US20050126737A1 (en) * 2003-12-04 2005-06-16 Yurko James A. Process for casting a semi-solid metal alloy
US20070227688A1 (en) * 2004-06-15 2007-10-04 Tosoh Smd, Inc. Continuous Casting of Copper to Form Sputter Targets
US7822522B2 (en) * 2006-05-31 2010-10-26 Techno-Sciences, Inc. (corporation) Adaptive energy absorption system for a vehicle seat
JP4907248B2 (ja) * 2006-07-14 2012-03-28 三協マテリアル株式会社 Ａｌ−Ｓｉ系アルミニウム合金の連続鋳造方法
US8139364B2 (en) 2007-01-31 2012-03-20 Robert Bosch Gmbh Electronic control module assembly
JP5360591B2 (ja) * 2009-01-08 2013-12-04 日本軽金属株式会社 アルミニウム合金鋳塊およびその製造方法
JP6105312B2 (ja) * 2013-02-13 2017-03-29 リンテック株式会社 支持装置及びデータ管理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707774A1 (de) * 1976-02-24 1977-09-01 Alusuisse Verfahren und vorrichtung zum kontinuierlichen giessen einer metallschmelze in giessformen
DE3006618A1 (de) * 1979-02-26 1980-09-04 Itt Ind Gmbh Deutsche Vorrichtung zur bildung eines halbfesten thixotropen legierungsbreis
EP0095596A1 (de) * 1982-06-01 1983-12-07 Alumax Inc. Verfahren und Einrichtung für das Stranggiessen von Schlicker

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
GB705762A (en) * 1951-10-15 1954-03-17 Skf Svenska Kullagerfab Ab Improvements relating to the continuous casting of metals
JPS6143146A (ja) * 1984-07-30 1986-03-01 ミネソタ　マイニング　アンド　マニユフアクチユアリング　コンパニー １，２‐アミノアルコール類の製造法
JPS6143137A (ja) * 1984-08-08 1986-03-01 Nippon Oil Co Ltd ノルボルネン類のカルボニル化方法
US4577676A (en) * 1984-12-17 1986-03-25 Olin Corporation Method and apparatus for casting ingot with refined grain structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707774A1 (de) * 1976-02-24 1977-09-01 Alusuisse Verfahren und vorrichtung zum kontinuierlichen giessen einer metallschmelze in giessformen
DE3006618A1 (de) * 1979-02-26 1980-09-04 Itt Ind Gmbh Deutsche Vorrichtung zur bildung eines halbfesten thixotropen legierungsbreis
EP0095596A1 (de) * 1982-06-01 1983-12-07 Alumax Inc. Verfahren und Einrichtung für das Stranggiessen von Schlicker
US4482012A (en) * 1982-06-01 1984-11-13 International Telephone And Telegraph Corporation Process and apparatus for continuous slurry casting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2656552A1 (fr) * 1990-01-04 1991-07-05 Pechiney Aluminium Procede de fabrication de produits metalliques thixotropes par coulee continue avec brassage electromagnetique en courant polyphase.
EP0439981A1 (de) * 1990-01-04 1991-08-07 Aluminium Pechiney Verfahren und Vorrichtung zur Herstellung von thixotropen metallischen Produkten mittels Strangguss und elektromagnetischem Rühren
AU715447B2 (en) * 1996-03-20 2000-02-03 Aluminium Pechiney Thixotropic aluminium-silicon-copper alloy for forming in the semisolid state
FR2758101A1 (fr) * 1997-01-09 1998-07-10 Charles Vives Procede d'affinage par effet de cavitation electromagnetique de la microstructure des metaux et alliages coules en charge par la technique "hot top"
FR2761624A1 (fr) * 1997-04-07 1998-10-09 Charles Vives Procede magnetomecanique d'affinage par effet de cavitation de la structure cristalline des metaux et alliages coules en charge par la technique "hot-top"

Also Published As

Publication number Publication date
JPH0255650A (ja) 1990-02-26
NO170796C (no) 1992-12-09
FR2634677A1 (fr) 1990-02-02
NO170796B (no) 1992-08-31
DE68900825D1 (de) 1992-03-26
JPH0338019B2 (de) 1991-06-07
NZ229804A (en) 1992-04-28
AU3783589A (en) 1990-01-11
NO892807L (no) 1990-01-08
ES2029382T3 (es) 1992-08-01
ATE72527T1 (de) 1992-02-15
AU609690B2 (en) 1991-05-02
EP0351327B1 (de) 1992-02-12
US4964455A (en) 1990-10-23
CA1334474C (fr) 1995-02-21
FR2634677B1 (fr) 1990-09-21
GR3003797T3 (de) 1993-03-16
NO892807D0 (no) 1989-07-06

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