WO1990000101A1 - Coulee de metal a basse pression - Google Patents

Coulee de metal a basse pression Download PDF

Info

Publication number
WO1990000101A1
WO1990000101A1 PCT/GB1989/000749 GB8900749W WO9000101A1 WO 1990000101 A1 WO1990000101 A1 WO 1990000101A1 GB 8900749 W GB8900749 W GB 8900749W WO 9000101 A1 WO9000101 A1 WO 9000101A1
Authority
WO
WIPO (PCT)
Prior art keywords
reservoir
riser tube
mould
metal
casting
Prior art date
Application number
PCT/GB1989/000749
Other languages
English (en)
Inventor
Maurice Rex Hinchcliffe
Original Assignee
Collins Motor Corporation Limited
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 Collins Motor Corporation Limited filed Critical Collins Motor Corporation Limited
Publication of WO1990000101A1 publication Critical patent/WO1990000101A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/006—Casting by filling the mould through rotation of the mould together with a molten metal holding recipient, about a common axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/08—Shaking, vibrating, or turning of moulds

Definitions

  • the present invention relates to the low pressure casting of metal, more particularly but not exclusively light metal alloys such as aluminium-based and magnesium-based alloys, with a casting weight up to about 15 Kg.
  • the metal may be cast in expendible sand moulds, permanent metal moulds or dies, or combination moulds.
  • metal from a massive e.g. 200-1000 Kg pool of molten metal in a sealed reservoir is forced to flow up a riser tube by gas pressure applied to the surface of the metal pool, the molten metal thus being forced up the riser tube into a mould to fill the latter.
  • the metal in the mould is allowed to cool and shrinkage losses are made up by further metal forced up the riser tube by gas pressure, given appropriate temperature gradients between the casting and feed points.
  • a low pressure casting method is characterised in that the assembly formed by the reservoir for the molten metal, the riser tube and the mould connected thereto is inverted after the mould has been filled and is maintained in this attitude during cooling of the metal casting in the mould.
  • the metal within the mould can solidify without the risk of generating convection currents between the metal in the mould and the metal in the riser tube, which would otherwise intrude at critical points in the solidification process.
  • the size of the reservoir will be such that it will hold sufficient metal for at most a few castings, to enable the assembly to be readily inverted.
  • the apparatus may be quickly changed from casting one alloy composition to another, without risk of contamination of the second alloy by remnants of the first.
  • the invention thus also provides a low pressure metal casting apparatus comprising a closed reservoir for containing a quantity of molten metal, a riser tube extending across the interior of the reservoir from an outlet in a wall of the reservoir to a mouth near the opposed wall surface of the reservoir, means for applying gas pressure within the reservoir and means for mounting a casting mould in communication with the outlet end of the riser tube, wherein the reservoir, riser tube and mould mounting means are mounted by means enabling them to be inverted as a unit during a casting operation.
  • the reservoir is separable into two parts for cleaning purposes and any other necessary treatment.
  • the reservoir and riser tube are advantageously formed of an appropriate metal, such as cast iron for the casting of light alloys, a refractory wash being applied to the surfaces which come into contact with the molten metal.
  • the riser tube can then be formed integrally with one half of the reservoir.
  • the latter preferably flares down from a relatively large mouth end to an appropriately small outlet end to feed the mould advantageously through a replaceable nozzle element.
  • Appropriate ceramic materials could also be used.
  • Figure 1 is a vertial section through casting apparatus in accordance with the invention in a first stage in a casting operation
  • Figure 2 is a vertical elevational view of the apparatus in a second stage of the casting operation.
  • the casting apparatus shown diagramatically in Figure 1 comprises a spherical reservoir 1 formed by two hemispherical cast iron (or alloyed cast iron) shell halves 2 and 3 which fit together along a diametral dividing plane 4 in this case of a diameter approximately 300 mm.
  • a hollow neck 5 and a frusto-conical riser tube 6 which is coaxial with the neck 5 and terminates at its widest part in a mouth 7 adjacent the inner wall surface of the other shell half 2.
  • a drain port 8 Opposite the mouth 7, the shell half 2 is formed with a drain port 8, with suitable closure, to enable the reservoir to be drained at the end of a casting operation or series of casting operations.
  • the shell half 3 is formed with a charging port 9 for admitting further superheated molten metal, the charging port having a rapid acting stopper (not shown). Additionally, the shell half 3 is formed with a gas port 10 for the admission of a gas under pressure which is inert with respect to the metal to be cast.
  • the inlet may be of porous ceramic or may be a mechanical self closing valve and may include a pressure release valve as well as a connection for a pressure gauge.
  • Each shell half 2,3 has mountings 11 for thermo-couples for monitoring the temperature of molten metal within the reservoir.
  • Each shell half is surrounded by insulation 12 within respective sheet metal outer casings 13 and 14.
  • the assembly formed by the shell half 2 and its casing 13, together with the insulation 12 therein, is detachably secured to the shell half 3 by a set erf tie- bolts 15 engaged in screw-threaded holes around the perimeter of the shell half 3.
  • a ceramic gasket 22 with a central apperature is preferably interposed between the top surface of the casing 14 and the underside of the mould assembly 20, as seen in Figure 1.
  • the entire assembly of the reservoir 1 and its enclosure and the mould 20 is pivotly mounted on stub-shafts 23 journalled in bearings in a support frame (not shown) on either side of the assembly.
  • the entire assembly can thus be swung into an inverted position around the axis of the stub-shafts 23, for example by means of a lever arm 24 attached to the casing 14 and operated by a suitable mechanism (not shown).
  • the tie- bolts 15 are removed, followed by the casing 13 and the shell half 2.
  • the entire interior surface of the reservoir 1 is then readily accessible for any necessary cleaning, followed by the application of a layer of refractory material in the form of a wash.
  • the tapering shape of the tube 6 greatly assists access to the interior of the tube for this purpose.
  • a new nozzle assembly 17 is fitted and the reservoir reassembled and secured together by the tie-bolts 15. With a new filter 18 installed, the required mould assembly 20 is secured together and securly fastened to the casing 14 through a framework 24 secured to the latter.
  • the reservoir is then preheated by means of portable gas burners inserted into the reservoir with all its ports open.
  • a gas burner ring 25 placed beneath the shell 2 counteracts heat losses, the central portion of the shell being left uninsulated for this purpose. Further heat can be allowed into the portion of the insulation adjacent the shell 2 through openings 26 in the casing 13.
  • the reservoir is then charged with superheated molten alloy (i.e. at a temperature above its melting point) through the inlet 9 up to the level 26, the inlet then being closed.
  • Inert gas is then introduced under pressure through the inlet 10 into the annular space surrounding the smaller diameter end of the riser tube 6 thereby forcing molten metal upwards within the riser tube and hence through the nozzle assembly 17 and the filter 18 into the interior of the mould which in this example is constructed to form an.air-cooled, finned cylinder head.
  • air within the mould 20 can be extracted through a pipe 27 assisted by external vacuum source. The molten metal thus rises smoothly to fill the mould.
  • the gas burner 25 is then extinguished, and withdrawn if necessary, and the entire assembly formed by the reservoir 1, its casing 13 and 14 and the mould assembly 20 is swung around the pivots 23 to an inverted position as shown in Figure 2 for cooling of the metal in the mould.
  • the metal cools and solidifies, its density increases and thus, under gravity, tends to remain within the now-lowermost mould. Shrinkage losses due to this contraction on cooling are readily made up within the mould by further metal supplied through the nozzle assembly 17 under the head of molten metal within the riser tube 6 augmented, if desired, by gas pressure within the reservoir.
  • the metal within the mould can cool and solidify progressively without risk of disturbance caused by convection currents within the metal as would have tended to have happened if the entire assembly had not been inverted.
  • the rate of cooling within the mould can be made very rapid for example by directing water jets for a predetermined period onto the exterior of the metal dies forming the mould (in particular, from below) and, if appropriate, flowing water through passages within the dies themselves.
  • This very rapid cooling may itself have beneficial effects on the casting being formed, for example as a result of crystalisation of silicon to provide a hard surface in the case of a cylinder bore.
  • the assembly can be inverted once more to the position shown in Figure 1, the mould 20 opened, the casting removed, the mould closed again, an appropriate charge of molten metal added through the inlet 9 and the process then repeated.
  • the volume of metal held in the reservoir will be sufficient at most for only a few castings.
  • the reservoir can be recharged as necessary by syphoning or pumping from a bulk holder of superheated molten metal.
  • the reservoir can be emptied by removal of the drain plug 8, the reservoir cooled or allowed to cool and then separated for cleaning and recoating prior to restarting with the new alloy.
  • each new change of metal is introduced into the reservoir, it can be readily and effectively degassed, if required, for example with argon or nitrogen. It can be innoculated with any required additives.
  • two or more apparatus of the kind shown in the drawings may be "ganged" together to fill a common mould.
  • the frusto-conical construction of the riser tube 6 may also be applied with advantage in low pressure casting machines of more conventional non-inverting type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

La pression de gaz appliquée à la surface (26) de métal en fusion trouvant dans un réservoir fermé (1) force ledit métal à s'écouler en douceur jusque dans un moule (20) par un tube (6) de masselotte et un ajutage (17) de versement remplaçable. Une fois le moule rempli, tout l'ensemble formé par le réservoir (1), le tube de masselotte (6) et le moule (20) est renversé de sorte que le métal en fusion se trouvant dans le tube (6) de masselotte soit alors disponible pour alimenter le moule afin de compenser le retrait.
PCT/GB1989/000749 1988-07-04 1989-07-04 Coulee de metal a basse pression WO1990000101A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8815901.7 1988-07-04
GB8815901A GB2225970A (en) 1988-07-04 1988-07-04 Low pressure casting of metal

Publications (1)

Publication Number Publication Date
WO1990000101A1 true WO1990000101A1 (fr) 1990-01-11

Family

ID=10639848

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000749 WO1990000101A1 (fr) 1988-07-04 1989-07-04 Coulee de metal a basse pression

Country Status (3)

Country Link
AU (1) AU3966389A (fr)
GB (1) GB2225970A (fr)
WO (1) WO1990000101A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599768A1 (fr) * 1992-11-20 1994-06-01 Agustin Arana Erana Dispositif d'alimentation de métal sans basse pression d'un moule et sable borgne, moule et installation de coules correspondants
US5907086A (en) * 1991-05-01 1999-05-25 Pioneer Hi-Bred International, Inc. Plant promoter sequences
EP0941789A1 (fr) * 1998-03-10 1999-09-15 Montupet S.A. Procédé et installation de moulage de pièces en alliage léger
CN111182752A (zh) * 2019-12-30 2020-05-19 贵州新蓝辉金属制品有限公司 一种磁悬浮列车用散热器机箱及其铸造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304622C2 (de) * 1993-02-16 1996-09-19 Bruehl Aluminiumtechnik Verfahren zum Füllen einer Gießform
ITBS20030068A1 (it) * 2003-07-07 2005-01-08 Meccanica Bassi S P A Banco, conchiglia e procedimento di colata, in particolare per testa cilindri di motore.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241566B (de) * 1955-12-24 1967-06-01 Karl Schmidt Ges Mit Beschraen Steigrohr fuer das Niederdruckgiessen von Kolben fuer Brennkraftmaschinen
FR2007747A1 (fr) * 1968-05-03 1970-01-09 Sulzer Ag
DE2358719A1 (de) * 1973-11-26 1975-06-05 Dso Metalurgia Rudodobiv Verfahren und vorrichtung zum giessen von metallen und metall-legierungen
DE2730361A1 (de) * 1977-02-04 1978-08-10 Honda Kinzoku Gijutsu Kk Giessgeraet
EP0234877B1 (fr) * 1986-02-21 1989-12-27 Cosworth Research And Development Limited Procédé et dispositif de coulée
JPH06123565A (ja) * 1992-10-08 1994-05-06 Mitsubishi Electric Corp 炉内温度監視装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241566B (de) * 1955-12-24 1967-06-01 Karl Schmidt Ges Mit Beschraen Steigrohr fuer das Niederdruckgiessen von Kolben fuer Brennkraftmaschinen
FR2007747A1 (fr) * 1968-05-03 1970-01-09 Sulzer Ag
DE2358719A1 (de) * 1973-11-26 1975-06-05 Dso Metalurgia Rudodobiv Verfahren und vorrichtung zum giessen von metallen und metall-legierungen
DE2730361A1 (de) * 1977-02-04 1978-08-10 Honda Kinzoku Gijutsu Kk Giessgeraet
EP0234877B1 (fr) * 1986-02-21 1989-12-27 Cosworth Research And Development Limited Procédé et dispositif de coulée
JPH06123565A (ja) * 1992-10-08 1994-05-06 Mitsubishi Electric Corp 炉内温度監視装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 10, no. 174 (M-490)(2230), 19 June 1986; & JP-A-6123565 (SHINTO KOGYO K.K.) 1 February 1986 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907086A (en) * 1991-05-01 1999-05-25 Pioneer Hi-Bred International, Inc. Plant promoter sequences
EP0599768A1 (fr) * 1992-11-20 1994-06-01 Agustin Arana Erana Dispositif d'alimentation de métal sans basse pression d'un moule et sable borgne, moule et installation de coules correspondants
EP0941789A1 (fr) * 1998-03-10 1999-09-15 Montupet S.A. Procédé et installation de moulage de pièces en alliage léger
FR2775917A1 (fr) * 1998-03-10 1999-09-17 Montupet Sa Procede de moulage en grande serie de pieces d'alliage d'aluminium et equipements associes
US6540007B2 (en) 1998-03-10 2003-04-01 Montupet S.A. Molding process for the mass production of aluminum alloy castings and associated items of equipment
CN111182752A (zh) * 2019-12-30 2020-05-19 贵州新蓝辉金属制品有限公司 一种磁悬浮列车用散热器机箱及其铸造方法
CN111182752B (zh) * 2019-12-30 2021-04-13 贵州新蓝辉金属制品有限公司 一种磁悬浮列车用散热器机箱及其铸造方法

Also Published As

Publication number Publication date
GB8815901D0 (en) 1988-08-10
AU3966389A (en) 1990-01-23
GB2225970A (en) 1990-06-20

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