EP0561805B1 - Procede et dispositif d'introduction tardive d'alliage particulaire lors de la coulee d'un metal liquide - Google Patents

Procede et dispositif d'introduction tardive d'alliage particulaire lors de la coulee d'un metal liquide Download PDF

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Publication number
EP0561805B1
EP0561805B1 EP91919560A EP91919560A EP0561805B1 EP 0561805 B1 EP0561805 B1 EP 0561805B1 EP 91919560 A EP91919560 A EP 91919560A EP 91919560 A EP91919560 A EP 91919560A EP 0561805 B1 EP0561805 B1 EP 0561805B1
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EP
European Patent Office
Prior art keywords
liquid metal
mixing chamber
particulate alloy
stream
casting
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
EP91919560A
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German (de)
English (en)
French (fr)
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EP0561805A1 (en
Inventor
Thomas Margaria
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.)
Ferropem SAS
Original Assignee
Pechiney Electrometallurgie SAS
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Filing date
Publication date
Application filed by Pechiney Electrometallurgie SAS filed Critical Pechiney Electrometallurgie SAS
Publication of EP0561805A1 publication Critical patent/EP0561805A1/xx
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Publication of EP0561805B1 publication Critical patent/EP0561805B1/fr
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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
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/007—Treatment of the fused masses in the supply runners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • the invention relates to a device and a method for late introduction of particulate alloy (powder or grain) during the casting of a liquid metal (generally cast iron).
  • the invention is especially intended for the discontinuous casting of shaped parts in series of medium and great importance in molds obtained by automatic machines.
  • Said late introduction can be carried out in a ladle just before pouring; but this leads to an insufficient yield and regularity of quality of the castings.
  • in mold also known under the name “in mold” which consists in providing at the entrance of the casting mold a housing in which will be disposed the treatment agent so that '' it is dissolved regularly by the molten iron entering the mold.
  • This technique is effective but also long and difficult to implement, in particular it is necessary to study carefully the configuration of the geometry of the feed channels of the cast iron in order to avoid the possible entrainment of endogenous or exogenous inclusions within the casting.
  • This technique is preferably reserved for large series which make it possible to cushion the development of the mold.
  • Document FR 2 588 571 also discloses a device in which the treatment agent is introduced using a gas under low pressure into a closed treatment chamber, also under low pressure, in which there is metal liquid to be treated and poured.
  • a pressurized device allows a good dissolution of the agents, in particular Mg, and the obtaining of a good quality of the castings but it poses operational problems (fouling, blocking of the vents, untimely accumulation of undissolved agent. ..) when you want to operate discontinuous casting in series.
  • a similar device is known from documents EP 30 220 or BE 639410.
  • the treatment agent is added, using a carrier gas, to the surface of the liquid iron set in motion in the form of a vortex at the interior of a room.
  • EP 30220 it is preferable to close said chamber with a tight cover so as to improve the efficiency of use of the agent when it is volatile (for example if it contains magnesium).
  • This device used for discontinuous series castings with frequent interruption of the metal jet between two castings, has the same type of drawbacks as previously and requires the presence of a sealed chamber under pressure to facilitate the introduction of the agent. volatile and improve its yield and the quality of homogeneity of the flows.
  • immersed rods can be used in which the agent is propelled by a carrier gas; but this requires always having a large minimum quantity (base) of liquid metal and moreover the carrier gas is a considerable source of cooling, therefore of solidification of said liquid metal.
  • the applicant sought a device which is simple to use, and easily adaptable in particular to the discontinuous casting of small series of parts with late introduction of treatment agents, in particular those comprising volatile elements, such as Mg, and / or sparingly soluble in liquid metal.
  • the device according to the invention is generally placed between a ladle or a casting furnace containing the liquid metal to be treated and cast, and the mold or molds to receive said metal.
  • the device is particularly suitable for the introduction of particulate alloy poorly soluble in the liquid metal and / or containing a volatile element, during discontinuous casting of series of parts, that is to say with stopping the casting of the metal liquid between each casting.
  • a very volatile addition element such as magnesium
  • the stream of liquid metal circulating in the mixing chamber preferably at constant flow rate, must have a sufficient thickness in line with the particle injection zone so that said thickness is greater than the penetration depth of the particles (for example at least 30%); it must be confined so that the liquid metal is not dispersed during the injection of the particles.
  • the liquid metal stream is quickly evacuated, once treated, from the mixing chamber through a pouring orifice located in the bottom, feeding the mold of the part to be cast.
  • said stream of liquid metal of sufficient thickness to consist of a vortex obtained by means of a liquid metal supply channel, by gravity, which opens tangentially to the periphery of a mixing chamber of revolution (cylindrical or frustoconical) open from above, and near the lower part of said chamber, the bottom of which is generally profiled so as to facilitate the formation of said vortex.
  • Said bottom comprises the pouring orifice through which the treated liquid metal flows.
  • the particulate alloy is introduced into the stream of liquid metal in general using a rod which is not necessarily immersed in the liquid metal.
  • This rod is supplied with a high-speed carrier gas, preferably inert with respect to the cast metal, which carries the particulate alloy, so that said alloy leaves the rod, or any other means of introduction, with a speed or energy sufficient to penetrate, by violent projection, generally from a depth of at least 1 cm inside the liquid metal and preferably about 2 cm.
  • the penetration depth of the particles remains significantly greater than that of the carrier gas; this avoids any unacceptable cooling or scattering of the liquid metal.
  • the liquid metal stream can be fed from a large casting ladle via a funnel equipped with a calibrated outlet nozzle to regulate the flow of liquid metal or from '' an automatic feeding system for casting molds.
  • the mixing chamber can be fitted with an overflow opening.
  • the projection rod can be connected directly to a container of particulate alloy supplied with a carrier gas, the flow and pressure of which are sufficient to give said alloy the energy necessary to penetrate into the liquid metal.
  • the speed of the grains is of the order of 10 m / sec.
  • Figure 1 shows a non-limiting illustration of a device according to the invention, using a vortex, in a vertical section; it is equipped with a liquid metal feed funnel.
  • Figure 2 shows the same device seen from above, but without the funnel.
  • FIG. 3 represents a vector gas projection rod, equipped with an ejection device giving speed to the alloy particles while allowing a significant slowing down of the gas at the outlet.
  • FIG. 3 illustrating a particle introduction rod equipped with an ejection system giving the particles sufficient speed to penetrate deep into the liquid metal
  • the particle inlet tube connected to the particle tank which can be a simple container and need not be a gas pressure tank; this connection is preferably made via a particle dispenser-dispenser (not shown); in (12) an adjustable gas inlet (generally nitrogen) located at the height of the particle inlet; in (13), downstream, a narrowing of the venturi-type fluid stream, followed by a flaring (14) of the diameter of the outlet tube (15) of the non-submerged introduction rod.
  • an adjustable gas inlet generally nitrogen
  • the narrowing (13) allows the flow of gas supplied by the supply tube (12) to give the necessary energy to the solid particles, while the flaring (14) associated with the short length of the outlet tube (15) slows the gas while maintaining the speed of the particles.
  • the method and the device according to the invention thus make it possible to carry out series of discontinuous flows with late introduction of additives, on all types of molds, without fouling or harmful accumulation of additive due to the repeated stops of discontinuous casting, and without excessive risk of cooling due to carrier gas.
  • the device according to the invention can be easily interposed between a ladle or an automatic casting feeder and the molds without any special care or development, which makes it an easy to use device. It is adaptable to all types of foundries, in particular those using automatic machines for mass production of molds.
  • This device can be equipped with various regulating devices (liquid metal supply valves with opening and / or adjustable and / or controlled flow, flow measurements of liquid metal, powder, gas, level detection, timer introduction of powder etc ...) making it possible to optimize the casting conditions: for example the casting of a predetermined quantity of liquid metal, the introduction of a corresponding quantity of alloy dosed, at the appropriate time and for a period of time wanted.
  • various regulating devices liquid metal supply valves with opening and / or adjustable and / or controlled flow, flow measurements of liquid metal, powder, gas, level detection, timer introduction of powder etc .
  • the treatment alloy used has the following composition: Mg 5.8% Yes 47% It 0.54% Al 0.95% Fe balance and its particle size is between 0.2 and 2 mm.
  • the quantity introduced is 1.1% of the weight of cast iron cast.
  • a vortex is formed using a device conforming to that illustrated in FIGS. 1 and 2 on the other hand, the alloy is supplied using an alveolar metering device at atmospheric pressure connected to a distribution tube conveying, using a carrier gas, said alloy on the vortex of liquid iron.
  • the poor yields are due to dissolution irregularities which result in fouling of the casting device.
  • the gas velocity at the outlet of the projection rod is 20 m / s and the grains penetrate about 1 cm deep into the liquid melt of the vortex.
  • the quality of the cast iron is significantly improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Nozzles (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP91919560A 1991-10-16 1991-10-16 Procede et dispositif d'introduction tardive d'alliage particulaire lors de la coulee d'un metal liquide Expired - Lifetime EP0561805B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1991/000808 WO1993008309A1 (fr) 1991-10-16 1991-10-16 Dispositif d'introduction tardive d'alliage particulaire lors de la coulee d'un metal liquide

Publications (2)

Publication Number Publication Date
EP0561805A1 EP0561805A1 (en) 1993-09-29
EP0561805B1 true EP0561805B1 (fr) 1996-07-10

Family

ID=1239380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91919560A Expired - Lifetime EP0561805B1 (fr) 1991-10-16 1991-10-16 Procede et dispositif d'introduction tardive d'alliage particulaire lors de la coulee d'un metal liquide

Country Status (8)

Country Link
US (1) US5435527A (xx)
EP (1) EP0561805B1 (xx)
JP (1) JPH06502125A (xx)
KR (1) KR930703468A (xx)
DE (1) DE69120829T2 (xx)
ES (1) ES2089246T3 (xx)
FR (1) FR2665854A1 (xx)
WO (1) WO1993008309A1 (xx)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997026101A1 (en) * 1996-01-17 1997-07-24 Metaullics Systems Co. L.P. Improved molten metal charge well
US6036745A (en) * 1997-01-17 2000-03-14 Metaullics Systems Co., L.P. Molten metal charge well
EP1070149B1 (en) * 1998-03-30 2003-07-09 Metaullics Systems Co., L.P. Metal scrap submergence system for scrap charging/melting well of furnace
US6613119B2 (en) * 2002-01-10 2003-09-02 Pechiney Electrometallurgie Inoculant pellet for late inoculation of cast iron
CN100389909C (zh) * 2005-12-28 2008-05-28 山东建筑工程学院 球化浇包装置
EP2100975A1 (en) * 2008-02-26 2009-09-16 Corus Technology BV Method and device for treating a molten metal for producing metal castings
US8246715B2 (en) 2010-05-26 2012-08-21 Thut Bruno H Adjustable vortexer apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE639410A (xx) *
CH584075A5 (xx) * 1973-04-11 1977-01-31 Fischer Ag Georg
GB1558190A (en) * 1975-10-27 1979-12-19 Materials & Methods Ltd Method for treatment of a stream of molten iron ba introduction of a reactive additive
US4034970A (en) * 1976-01-28 1977-07-12 General Motors Corporation Method and device for nodularizing cast iron
US4053146A (en) * 1976-03-08 1977-10-11 Ford Motor Company Continuous stream treatment of ductile iron
US4191563A (en) * 1976-03-08 1980-03-04 Ford Motor Company Continuous stream treatment of ductile iron
DE2834900C2 (de) * 1978-06-28 1983-10-27 BCIRA, Birmingham Vorrichtung zur Einführung von Pulver oder Granulat in geschmolzenes Metall
US4298377A (en) * 1979-12-03 1981-11-03 Union Carbide Corporation Vortex reactor and method for adding solids to molten metal therewith
FR2588571B1 (fr) * 1985-10-15 1992-05-22 Pechiney Electrometallurgie Dispositif et procede d'injection continue sous faible pression d'un additif pulverulent dans un courant de metal fondu
NO165686C (no) * 1988-08-04 1991-03-20 Elkem As Anordning for tilfoersel av inokuleringsmiddel til en oese.
US5129629A (en) * 1990-10-11 1992-07-14 Hickman, Williams & Company Apparatus for feeding material into a molten stream

Also Published As

Publication number Publication date
DE69120829D1 (de) 1996-08-14
DE69120829T2 (de) 1996-12-12
FR2665854A1 (fr) 1992-02-21
ES2089246T3 (es) 1996-10-01
FR2665854B1 (xx) 1994-12-16
WO1993008309A1 (fr) 1993-04-29
KR930703468A (ko) 1993-11-30
JPH06502125A (ja) 1994-03-10
EP0561805A1 (en) 1993-09-29
US5435527A (en) 1995-07-25

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