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
  • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
  • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
  • B22D21/04—Casting aluminium or magnesium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D35/00—Equipment for conveying molten metal into beds or moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable

Definitions

• This invention relates to alloy casting apparatus.
• the present invention is directed to meeting that need and, in particular, to provide casting apparatus useful in the production of castings of magnesium alloys.
• the casting apparatus has a reversibly pivotable assembly which enables gravity flow and feeding of alloy in a casting operation.
• the assembly includes an alloy supply vessel, in the form of a reservoir pot, retort or tank, a furnace in which the vessel is contained, and a die with which the vessel is in communication.
• the assembly is tiltable in one direction about a substantially horizontal axis to enable the flow of alloy to at least one die cavity defined by the die and in the opposite direction to prevent that flow.
• the die most preferably is located laterally outwardly from the vessel and at a height such that, with the assembly in its non-casting position and the die open, the level of alloy in each of the vessel and the conduit is in the same horizontal plane extending adjacent to the second end of the conduit and a fixed part of the die.
• a syphon pipe may extend through the cover to enable maintenance of the level of alloy in the vessel by a syphon action.
• the vessel may have a transverse baffle or partition which divides the interior of the vessel into two chambers or sections. Where the vessel is a trough as described above, the transverse baffle may be intermediate of and, for example, about mid-way between the end walls.
• the conduit is able to extend from a first one of the chambers or sections, while fresh alloy is able to be supplied to the second chamber or section.
• the baffle has openings therethrough, or openings are defined between an edge of the baffle and a base surface of the vessel such that fresh alloy supplied to the second chamber is able to flow through to the first chamber from which the conduit extends.
• the arrangement is such that solid lumps of alloy are able to be present in the second, charging chamber without impeding alloy flowing from the first, casting chamber to the conduit during a casting operation.
• the die 18 has a lower part 46 and an upper part 48.
• the part 46 is mounted on or in relation to furnace 16.
• part 46 is depicted essentially as mounted on the upper end of part 38 of conduit 20.
• a more typical arrangement would be for furnace 16 to have a side bracket or apron on which part 46 is supported, as schematically depicted at 49.
• the upper part 48 is able to be moved between the position shown in Figure 2, in which the parts 46 and 48 define a die cavity 50 (see Figure 3), and the raised position shown in Figure 1.
• apparatus has upstanding guides 52 on the upper ends of which a hydraulic ram 54 is mounted.
• the ram 54 is retractable and extendable for raising and lowering of die part 48 relative to die part 46.
• assembly 12 Due to the length of main part 32 of conduit 20, it is sufficient for assembly 12 to be tilted through only a relatively small angle in establishing the pressure head H on moving from the non-casting position to the casting position.
• the angle may be for example, from about 15° to 30°, such as from about 20° to 25°.
• the attainment of a substantial pressure head is assisted by the downward inclination of conduit 20 relative to vessel 14 with assembly 12 in the non-casting position, and the bent or dog-leg form of conduit 20 resulting from its mutually inclined parts 32 and 38.
• valve 80 Prior to the commencement of tilting from the casting position, valve 80 is closed and valve 82 is opened. With opening of valve 82, protective gas is supplied into chamber 68, and the protective gas is able to pass via passageways 71 and the die cavity 50, into the end of conduit 20. This is enabled by the shrinkage of alloy in cavity 50 on solidification providing a sufficient slight clearance around the resultant casting 56 for the flow of protective gas from passageways 71 , around the casting 56 and sprue metal to conduit 20. Also, the protective gas necessarily is supplied at a pressure in excess of atmospheric pressure for its supply into chamber 68 while, as indicated, retracted alloy in conduit 20 tends to create a reduction in pressure is generated in conduit 20.
• Tilting to the storage position also can be used in the event of a failure of vessel 14 which allows molten alloy to drain into furnace 16.
• furnace 16 has a drainage port 84 which, with assembly 12 in the storage position, enables molten alloy to be drained into a chamber 86 mounted along the side of furnace 16 remote from die 18.
• the chamber 86 may be provided with flux 87 suitable for forming a slag with molten alloy. As the chamber 86 is able to remain relatively cool, the flux may be kept in plastic bags which melt on contact with the alloy to release their contents.
• the sloping base 88 facilitates draining of alloy into chamber 86.
• the required level of alloy in vessel 14 is such that it is below the mid-portion of 29a with the assembly 12 in the non-casting position and below a respective end portion 29b with assembly 12 in each of the casting and storage positions.
• the apparatus 110 shown therein is very similar to the apparatus 10 of Figures 1 and 2.
• the structure of and casting operations with apparatus 110 generally will be understood from the description of Figures 1 and 2.
• components of the apparatus 110 they have the same reference numeral as the corresponding components of apparatus 10, plus 100.
• staunchens and a ram corresponding to staunchens 24 and ram 26 of Figures 1 and 2 have been omitted for simplicity of illustration.
• each end 103d of each alternate member 103, or each end 103d of each member 103 there is a similar facility for gas flow.
• a port 113 communicating with groove 109 enables a flow of gas to or from the die cavity 150. With the die closed, the opposed ends of adjacent members 103 abut so that the groove 109 and channels 111 provide a passageway between the die cavity 150 and port 113.
• the casting apparatus is found to enable production of high-integrity castings which can be heat treatable and weldable. Castings with complex internal shapes are possible, using sand cores.
• the apparatus is suitable for small to large production quantities for a wide range of products for the automotive and other industries.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Furnace Charging Or Discharging (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Furnace Details (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36000404

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (11)

Citations (1)

Family Cites Families (52)

• 2005
  • 2005-08-31 TW TW094130002A patent/TWI386262B/zh not_active IP Right Cessation
  • 2005-09-01 CN CN2005800345699A patent/CN101039767B/zh not_active Expired - Fee Related
  • 2005-09-01 MY MYPI20054105A patent/MY145167A/en unknown
  • 2005-09-01 KR KR1020077007599A patent/KR101234171B1/ko not_active Expired - Fee Related
  • 2005-09-01 EP EP05774314.8A patent/EP1789219B1/en not_active Expired - Lifetime
  • 2005-09-01 JP JP2007528522A patent/JP5044401B2/ja not_active Expired - Fee Related
  • 2005-09-01 CA CA2585791A patent/CA2585791C/en not_active Expired - Fee Related
  • 2005-09-01 ES ES05774314T patent/ES2433365T3/es not_active Expired - Lifetime
  • 2005-09-01 WO PCT/AU2005/001315 patent/WO2006024090A2/en not_active Ceased
  • 2005-09-01 NZ NZ553868A patent/NZ553868A/en not_active IP Right Cessation
  • 2005-09-01 US US11/661,803 patent/US9427803B2/en not_active Expired - Fee Related

Patent Citations (1)

Non-Patent Citations (1)

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