WO2007062476A1 - Appareil de fourniture de gaz et de lubrifiant - Google Patents

Appareil de fourniture de gaz et de lubrifiant Download PDF

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Publication number
WO2007062476A1
WO2007062476A1 PCT/AU2006/001820 AU2006001820W WO2007062476A1 WO 2007062476 A1 WO2007062476 A1 WO 2007062476A1 AU 2006001820 W AU2006001820 W AU 2006001820W WO 2007062476 A1 WO2007062476 A1 WO 2007062476A1
Authority
WO
WIPO (PCT)
Prior art keywords
lubricant
gas
mould
distribution element
distribution
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.)
Ceased
Application number
PCT/AU2006/001820
Other languages
English (en)
Inventor
John Francis Grandfield
John Andrew Taylor
Ian Frank Bainbridge
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.)
Cast Centre Pty Ltd
Original Assignee
Cast Centre Pty Ltd
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
Priority claimed from AU2005906692A external-priority patent/AU2005906692A0/en
Application filed by Cast Centre Pty Ltd filed Critical Cast Centre Pty Ltd
Priority to EP06817567A priority Critical patent/EP1954425A4/fr
Publication of WO2007062476A1 publication Critical patent/WO2007062476A1/fr
Priority to US12/128,242 priority patent/US20080283212A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • B22D11/07—Lubricating the moulds
    • 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
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting

Definitions

  • the present invention relates to a gas and lubricant delivery apparatus and more particularly to a lubricant delivery element, in particular for direct chill continuous casting hot top moulds .
  • One known method of casting metal ingots is that of direct chill continuous casting using a hot top mould.
  • a bath of molten metal is located directly above or next to the mould cavity, through which the molten metal is either drawn horizontally or flows vertically under gravity.
  • the mould body is continuously cooled using a coolant in a chamber around the mould, thus chilling the molten metal to form the ingots .
  • the mould body also acts as an outlet for the direct chill water spray.
  • a lubricant is introduced into the mould cavity to improve the surface quality of the ingots by preventing the sticking of the metal to the inside wall of the mould.
  • oil and air are introduced into the mould cavity via grooves in the top and bottom of a distribution plate.
  • Circumferential channels in the mould body are provided to deliver oil and air to the radial grooves in the distribution plate.
  • the grooves in the distribution plate may suffer from molten metal entry. After entering the grooves the metal solidifies, resulting in tearing of the billet surface and damage to the distribution plate. This problem may be minimised by reducing the diameter of the grooves (to as little as 100- 200 micron) , however, the manufacturing required is costly and ultimately it is not sufficient to completely prevent metal entry should the gas pressure in the mould cavity be insufficient .
  • a further problem with using a distribution plate is that because oil is introduced to the distribution plate at one point from the circumferential channel, this results in a region of low oil flow directly opposite the feed point and hence an uneven distribution of oil occurs in the mould cavity. Similar problems may also occur with the air distribution.
  • a lubricant delivery element for delivering lubricant into a cavity
  • the lubricant distribution element comprising a thin element of porous material for delivering lubricant into the cavity through the element.
  • the lubricant distribution element has a thickness of less than approximately 5mm.
  • the lubricant distribution element has a thickness of 0.1 to 5mm, more preferably, l-5mm, more preferably 2-3mm.
  • the lubricant distribution element has a thickness of approximately 1.5 mm.
  • the lubricant distribution element may however, have a thickness of less than 0.1mm.
  • the lubricant distribution element may have at least one groove formed in the surface of the element.
  • the groove may assist in the circumferential distribution of lubricant through the element for even flow of lubricant from the circumference or sides of the distribution element.
  • the groove extends substantially around the circumference or the sides of the element.
  • the groove is approximately 0.5mm deep.
  • the porous material comprises an agglomerate of particles.
  • the particles have an average diameter of less than approximately 0.25mm.
  • the particles have an average diameter of 10 to 100 micron.
  • the particles have an average diameter of 40 to 70 micron.
  • the average diameter of the particles may be less than 10 microns.
  • the average diameter of the pores in the porous material is less than the size of the particles.
  • the porous material has a porosity of
  • the porosity of the material may change across the width of the lubricant distribution element .
  • the porous material is of the kind commonly used in powder metallurgy applications.
  • the porous material is aluminium, iron, copper or sintered bronze, more preferably, sintered bronze.
  • the thin element of porous material is manufactured by sintering bronze powder in a steel die at high temperature.
  • the porous material may be a porous ceramic .
  • the porous material may also be graphite.
  • the lubricant distribution element is preferably provided with a strengthening means.
  • the strengthening means may be, for example, a thin element of metal laminated to the graphite.
  • the porous material may be a porous plastic, such as polytetrafluoroethylene .
  • the lubricant distribution element is shaped so that in use, it extends around the perimeter of the cavity.
  • the lubricant distribution element is in the shape of an annular disc.
  • the annulus of the annular disc may be round or non-round in shape.
  • the lubricant distribution element may comprise a single element or a number of parts which, in use, abut one another to form the lubricant distribution element.
  • the lubricant delivery element further comprises a sealant for sealing the lubricant distribution element.
  • the sealant seals at least portions of the horizontal surfaces of the element. This forces the lubricant to flow through the element as opposed to over the surface .
  • the sealant seals at least a portion of the surface of the lubricant distribution element which is not arranged to be exposed to the cavity.
  • the sealant comprises a layer of varnish on at least a portion of the surface of the lubricant distribution element .
  • the sealant may comprise a layer of impermeable foil on at least a portion of the surface of the lubricant distribution element.
  • the sealant may comprise a layer of settable rubber.
  • the settable rubber is applied as a paste which sets after application.
  • the sealant may comprise a combination of layers of any two or more of varnish, impermeable foil and a settable rubber.
  • the sealant comprises a fibre gasket (s) .
  • the sealant comprises an 0-ring.
  • the sealant comprises a flat surface.
  • the flat surface is provided by a metal plate.
  • the flat surface may, alternatively, be provided by the top of the mould body.
  • a gas delivery element for delivering gas into a cavity, the element comprising a thin element of porous material for delivering gas into the cavity through the element.
  • the gas distribution element has one or more of the features of the lubricant distribution element according to the first aspect.
  • a gas and lubricant delivery apparatus for delivering gas and lubricant into a cavity, the apparatus comprising a lubricant distribution element according to the first aspect of the present invention, and a gas distribution element for delivering gas into the cavity.
  • the gas distribution element is substantially similar to the lubricant distribution element.
  • gas is delivered into the cavity through the gas distribution element.
  • the gas distribution element may be integrally formed with the lubricant distribution element.
  • the gas distribution element preferably comprises radial grooves and at least one circumferential groove formed in the upper surface of the lubricant distribution element.
  • the gas distribution element may take the form of a distribution plate, which may be part of the top of the cavity wall or be a separate plate.
  • the distribution plate has a first set of grooves formed in the top surface of the plate for delivery of gas into the cavity.
  • the distribution plate also has a second set of grooves formed in the top surface to connect the first set of grooves to one another for distribution of the gas to all the grooves in the first set.
  • the distribution plate is manufactured from a metal, such as, for example steel or aluminium.
  • the distribution plate is manufactured from a ceramic .
  • the distribution plate is manufactured from a plastic, such as polytetrafluoro- ethylene.
  • the gas distribution element is shaped to extend around the perimeter of the cavity.
  • the gas distribution element is of a similar shape to the lubricant distribution element.
  • the gas distribution element is in the shape of an annular disc.
  • the annulus of the annular disc may be round or non-round in shape.
  • the gas distribution element is arranged, in use, to be located above the lubricant distribution element.
  • the gas distribution element has a cut away portion in its lower surface into which the lubricant distribution element is adapted to fit snugly.
  • the gas distribution element may comprise a single element or a number of parts which, in use, abut one another to form the gas distribution element.
  • the apparatus for delivering gas and lubricant further comprises a sealant for sealing the lubricant distribution element and the gas distribution element .
  • the sealant seals the gas distribution element from the lubricant distribution element .
  • the sealant seals at least a portion of the surface of the gas and lubricant distribution elements .
  • the sealant comprises a layer of varnish and/or impermeable foil and/or settable rubber and/or a fibre gasket (s) on at least some of the surface of the gas and lubricant elements .
  • the sealant may comprise an 0- ring.
  • the sealant may comprise a flat surface .
  • the sealant further comprises a sealing plate overlaying the gas distribution element for sealing the top of the gas distribution element.
  • a hot top mould for direct chill continuous casting of metal ingots comprising a mould having a mould body and a cavity defined in the mould body and a gas and lubricant delivery apparatus for delivering gas and lubricant to the mould cavity according to any one or more features of the third aspect of the invention.
  • the gas and lubricant delivery apparatus is located proximate the molten metal entry end of the mould.
  • the gas and lubricant delivery apparatus is located above the level of the mould body at which the molten metal solidifies.
  • the gas and lubricant delivery apparatus is located on top of the mould body.
  • the mould body has a space therein for the flow of coolant through the mould body.
  • the space for the flow of coolant is shaped to flow the coolant close to the gas and lubricant delivery apparatus.
  • the hot top mould further comprises a supply mechanism for supplying gas and lubricant to the gas and lubricant delivery apparatus.
  • the supply mechanism comprises gas and lubricant supply channels formed separately in the top of the mould, the supply channels being in fluid connection with the gas and lubricant delivery apparatus .
  • the supply mechanism may comprise pipe fittings through the mould body and connected directly to the gas and lubricant delivery apparatus.
  • the hot top mould further comprises a molten metal bath for feeding molten metal to the mould cavity.
  • the hot top mould further comprises an orifice plate, which spaces the molten metal bath from the mould.
  • the mould body may or may not have a graphite insert located just below the gas and lubricant delivery apparatus .
  • the metal is a non-ferrous metal such as aluminium, magnesium, copper or zinc and their alloys.
  • a hot top mould for direct chill continuous casting of metal ingots comprising a mould having a mould body and a cavity defined in the mould body, and a lubricant delivery element for delivering lubricant to the mould cavity according to the first aspect of the present invention.
  • Figure 1 is a schematic view of a gas and lubricant delivery apparatus for delivering gas and lubricant according to one embodiment of the present invention located in a hot top mould;
  • Figure 2 is a top plan view of a gas distribution element of the apparatus of Figure 1;
  • Figure 3 is a view of the gas distribution element of Figure 2 through axis A-A;
  • Figure 4 is a schematic view of a gas and lubricant delivery apparatus for delivering gas and lubricant according to an alternative embodiment of the present invention located in a hot top mould;
  • Figure 5 is a schematic view of a gas and lubricant delivery apparatus for delivering gas and lubricant according to another alternative embodiment of the present invention located in a hot top mould;
  • Figure 6A is a top plan view of a hot top mould incorporating a gas and lubricant delivery apparatus for delivering gas and lubricant according to another embodiment of the present invention
  • Figures 6B, GC, 6O and 6E are schematic views of the hot top mould of Figure 6A through sections A-A, B-B, C-C and D-D, respectively;
  • Figure 7 is an image of the surface of a metal ingot cast using a hot top mould comprising a gas and lubricant delivery apparatus for delivering gas and lubricant according to preferred embodiments of the present invention
  • a section of a hot top mould 10 for use in direct chill continuous casting of non-ferrous metals such as aluminium, magnesium, copper, zinc and their alloys, for example, is shown.
  • the hot top mould 10 comprises a molten metal bath 11 located above a mould 12 in a vertical arrangement, ie. so molten metal will flow substantially vertically through the mould 12.
  • the mould 12 and molten metal bath 11 may be arranged so that flow through the mould 12 is substantially horizontal.
  • the hot top mould 10 also comprises a gas and lubricant delivery apparatus 13 according to preferred embodiments of the present invention located at the top of the mould body 14 (ie. proximate the molten metal entry end of the mould 12 and above the level of the mould body 14 at which the molten metal contacts the mould body 14) for the delivery of gas (typically air) and lubricant (typically oil) to the mould cavity 15.
  • gas typically air
  • lubricant typically oil
  • the mould body 14 in use is cooled using a coolant (typically water) flowing through a space 17 in the mould body 14 in order to solidify the molten metal.
  • a coolant typically water
  • the mould body 14 preferably, but not necessarily, has an insert 27 manufactured of graphite.
  • the gas and lubricant delivery apparatus 13 comprises a lubricant distribution element 20 and a gas distribution element 21.
  • the lubricant distribution element 20 is an annular disc of porous material through which lubricant is delivered to the mould cavity 15. Although the annulus of the annular disc is shown as being round, it may be non-round. Furthermore, the lubricant distribution element 20 may comprise a single element or a number of parts which, in use, abut one another to form the lubricant distribution element 20.
  • the porous annular disc is thin, having a thickness of approximately 1 to 5mm. This range represents a balance between the disc being as thin as practical to fit into the hot top mould 10 and the pressure required to force the oil through the disc into the mould cavity 15.
  • the disc has a thickness of at least approximately 1.5mm with a 0.5mm groove formed in the top surface of the disc to further improve the distribution of oil around the circumference of the disc for even circumferential flow of lubricant and gas from the apparatus 13.
  • the space 17 in the mould body 14 for the coolant is shaped to flow the coolant close to the gas and lubricant delivery apparatus 13. Because the lubricant distribution element 20 is so thin it is readily cooled by the coolant cooling the mould body 14. This substantially prevents the lubricant, while it is inside the distribution element 20, from reaching a temperature where it will vaporise and decompose into tar-like deposits and thus restrict its flow through the lubricant distribution element 20.
  • the lubricant distribution element 20 in the form of a porous annular disc may be manufactured from any materials commonly used in powder metallurgy applications; such as aluminium, iron, copper or sintered bronze.
  • Sintered bronze is a preferable material as it provides the required strength and flexibility and is readily and cost effectively manufactured into any shape, including thin annular discs by sintering bronze powder in a steel die at high temperatures.
  • sintered bronze allows for good control over the porosity and pore size, particularly compared to graphite .
  • Use of porous ceramic materials to form the disc may also be possible.
  • Another alternative material which could be used is a porous plastic such as polytetrafluoroethylene .
  • the diameter of the particles used to form the disc is therefore less than approximately 0.25mm. Particles smaller than approximately 10-20 micron in diameter may be used to form a disc, however, at smaller particle sizes, the pressure required to force the oil through the porous disc may become too high for effective operation of the lubricant and gas delivery apparatus 13.
  • the diameter of the pores is generally approximately 20 - 40 micron.
  • the porosity of the thin disc is 10 to 70%, preferably, 20 to 40%.
  • the disc has a gradient of changing porosity across its width.
  • the gas distribution element 21 is in the form of an annular distribution, plate, shown in detail in Figures 2 and 3.
  • the gas distribution element 21 may comprise a single element or a number of parts which, in use, abut one another to form the gas distribution element 21.
  • the distribution plate has radial grooves 40 on its top surface 41 for delivering the gas to the mould cavity 15.
  • the distribution plate also has at least one circumferential groove 42 connecting the radial grooves 40 for distribution of the gas to all the grooves 40.
  • the distribution plate is preferably manufactured from a metal such as, for example, steel or aluminium.
  • the gas distribution element 21 in the form of an annular distribution plate also has a cut away portion 43 in its lower surface 44 into which the lubricant distribution element 20 in the form of the annular porous disc is adapted to fit snugly.
  • the gas distribution element 21 is integrally formed with the lubricant distribution element 20 by forming radial grooves and at least one circumferential groove on the upper surface of the lubricant distribution element 20 which is in the form of an annular disc of porous material .
  • the gas and lubricant delivery apparatus 13 comprising the lubricant distribution element 20 and the gas distribution element 21 is located on top of the mould body 14.
  • an orifice plate 25 spaces the top of the gas distribution element 21 from the bottom of the molten metal bath 11, with the entire arrangement fixed into position by a locking plate 26.
  • Part of the mould body 14 comprises a graphite liner 27, located immediately beneath the gas distribution element 21. The purpose of the graphite liner 27 is to provide a casting surface upon which the molten metal initially begins to solidify.
  • the orifice plate 25 has an overhang portion 28 extending into the mould cavity 15 past the lubricant and gas distribution elements 20,21. The overhang portion 28 creates a space 29 between the orifice plate 25 and the mould body 14, which is the entry point to the mould cavity 15 for the gas and lubricant delivered by the gas and lubricant delivery apparatus 13.
  • the gas and lubricant delivery apparatus 13 is arranged so that it is highly unlikely to be contacted by molten metal. Instead, the molten metal meniscus will contact the graphite liner 27 which is below the gas and lubricant delivery apparatus 13. This means that the apparatus 13 is not directly heated by the molten metal and hence the likelihood of lubricant vaporisation is further reduced. In use, the lubricant is allowed to enter the mould cavity 15 as a liquid and flow down a part of the mould body 15 before reaching the solidifying molten metal .
  • the supply of gas and lubricant to the gas and lubricant delivery apparatus 13 is provided by gas and lubricant supply channels 30,31 respectively formed in the top of the mould body 14.
  • gas and lubricant supply channels 30,31 respectively formed in the top of the mould body 14.
  • pipe fittings through the mould body 14 may be used to supply lubricant and/or gas directly to the gas and lubricant delivery apparatus 13.
  • a first 0-ring 32 seals the lubricant and gas supply channels 30,31 from one another.
  • a second O- ring 33 seals the entire gas and lubricant delivery apparatus 13 at the boundary between the locking plate 26 and the top of the mould body 14.
  • sealing of the top surface 41 of the gas distribution element 21 in the form of an annular distribution plate is provided by a sealing ring 34 overlaying the plate.
  • the bottom surface of the lubricant distribution element 20, in the form of the annular porous disc is sealed by a thin coat of varnish.
  • a layer of thin, impermeable foil or an 0-ring or a layer of settable rubber, applied as a paste, or a flat surface in the form of a metal plate or the top of the mould body 14 could be used. Sealing of the lubricant and gas distribution elements 20,21 guards against loss of lubricant and/or gas into other parts of the mould 12 providing controlled flow both radially and circumferentially.
  • the gas distribution element 121 is in the form of an annular porous disc similar to the lubricant distribution element 120.
  • the disc forming the gas distribution element 121 is sandwiched between the lubricant distribution element 120 and the orifice plate 125.
  • a layer 135 of either impermeable foil or varnish separates and seals the discs forming the lubricant and gas distribution elements 120,121 from one another.
  • The, gas is therefore delivered to the mould cavity 115 through the porous disc forming the gas distribution element 121 without substantial mixing with the lubricant being delivered to the mould cavity 115, through the porous disc forming the lubricant distribution element 120.
  • Rear surfaces 136 of both the lubricant and gas distribution elements 120,121 are sealed selectively using an impermeable foil, varnish layer, or a thin fibre gasket.
  • the lower surface 132 of the lubricant distribution element 120 is similarly sealed.
  • the lower surface 137 is not sealed where it is located above the lubricant supply channel 132 so that lubricant can be fed to the lubricant distribution element 120 from the channel 132.
  • Figure 4 also discloses an alternative supply mechanism of supplying gas to the gas distribution element 121, whereby an air supply line 145 through an air supply plate 136 located behind the delivery apparatus 113 (ie. away from the mould cavity 115) on top of the mould body 114 supplies the gas from the gas supply channel 131.
  • Figure 4 also shows the molten metal meniscus 150 where it contacts the graphite liner 127.
  • the gas and lubricant distribution elements 220,221 are shown extending beyond the mould body 214 defined by the graphite liner 227 into the mould cavity 215. Furthermore, the gas distribution element 221 overhangs the lubricant distribution element 220. This assists in directing the flow of gas perpendicular to the mould bodies 214.
  • the gas distribution element 221 in Figure 5 may be in the form of either an annular distribution plate or an annular porous disc.
  • Figure 5 also shows the gas and lubricant delivery apparatus 213 in use with an orifice plate 225 which does not have an overhang extending into the mould cavity 215 past the lubricant and gas delivery apparatus 213.
  • the delivery apparatus 313 comprises lubricant and gas distribution elements 320 and 321, respectively.
  • the top and bottom surfaces of the lubricant distribution element 320 are sealed by thin fibre gaskets 355, 356.
  • the gas distribution element 321 is different from previously described embodiments in that the radial and circumferential grooves 340, 342 for delivering the gas to the mould cavity 315 are formed in the lower surface 344 of the gas distribution element 321 as opposed to the top surface.
  • the gas distribution element 321 comprises two circumferential grooves 342 in the form of chambers, connected by a plurality of radial grooves 340, also in the form of chambers.
  • One of the circumferential chambers 342 is located on the inside wall of the mould cavity 315, slightly vertically spaced away from the other such that the radial channels 340 are slightly angled with respect to the horizontal.
  • the gas supply channels 330 are provided through the locking plate 326 as opposed to through the mould body 314 as shown in Figure 6B in particular.
  • the delivery apparatus 313 is also shown comprising a locating pin 357 for correctly positioning the gas and lubricant distribution elements 320, 321 within the hot top mould 310.
  • a hot top mould 10 according to preferred embodiments of the invention was used to cast a billet of aluminium alloy 6063.
  • the disc had a thickness of approximately 1.5 mm.
  • the gas distribution element 21 comprised a metal disc having radial grooves machined on one surface . Air was used as the gas and oil as the lubricant.
  • the resulting casting had a surface which was free of any defects as shown in Figure 7.
  • a test mould was set up in the lab to test a gas and lubricant delivery apparatus 13 according to embodiments of the present invention, in which the lubricant distribution element 20 and the gas distribution element 21 are formed of a porous plastic material, specifically polytetrafluoroethylene (“PTFE”) .
  • Figure 13 shows a schematic view of the test mould used.
  • the steps machined into the top of the mould body 14 in which the gas and lubricant distribution elements sit are of a depth which is 0.1 mm less than the thickness of the distribution elements so as to provide a compressive force to the horizontal surfaces of the distribution elements 20, 21 by the sealing ring 34.
  • the distribution elements 20, 21 were formed by cutting annular rings from 1.5 mm thick sheets of a porous PTFE plastic (having pores of 50 micron) supplied by Porex.
  • the diameters of the elements 20, 21 were such as to provide a 5 and 10 mm radial section through which the lubricant and gas, respectively, would flow to the inner surface of the mould 12.
  • the inner surface diameter of the mould was 150 mm.
  • the two distribution elements 20, 21 were stuck together using Dow-Corning Silastic 732, which is a silicon adhesive/sealant.
  • the top surface of the gas distribution element 21 and the lower surface of the lubricant distribution element 20 were also coated with silicon prior to assembly into the mould.
  • the gas supplied to the gas distribution element 21 was dry air from a cylinder, through a regulator to a needle valve for accurately controlling the flow.
  • the gas flow rate was measured using an Aalborg digital gas flow meter.
  • the gas flow meter was kept in the gas delivery line and the flow around the circumference of the mould was detected using a soap solution.
  • the lubricant supplied to the lubricant distribution element 20 was Exal45 as supplied by ODT Engineering. The circumferential flow of the lubricant in the mould was observed through the test mould which was formed from transparent Perspex for the purposes of this test.
  • a hot top mould 10 according to a preferred embodiment of the invention was used to cast a billet of magnesium alloy AZ80.
  • the mould diameter was 203 mm.
  • the nominal composition for AZ80 is 8.5% Aluminium and 0.5% Zinc, with the balance magnesium. Table 1 below provides details of the operating conditions used for the casting of the AZ80 billet.
  • Figure 14 shows the surface of the cast billets which have a satisfactory cast surface and are not cracked.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un élément de fourniture de lubrifiant qui délivre du lubrifiant dans une cavité, l'élément de distribution de lubrifiant comprenant un mince élément en matériau poreux par l'intermédiaire duquel il délivre le lubrifiant dans la cavité.
PCT/AU2006/001820 2005-11-30 2006-11-30 Appareil de fourniture de gaz et de lubrifiant Ceased WO2007062476A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06817567A EP1954425A4 (fr) 2005-11-30 2006-11-30 Appareil de fourniture de gaz et de lubrifiant
US12/128,242 US20080283212A1 (en) 2005-11-30 2008-05-28 Gas lubricant and delivery apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005906692A AU2005906692A0 (en) 2005-11-30 A gas and lubricant delivery apparatus and an apparatus for feeding molten metal
AU2005906692 2005-11-30

Publications (1)

Publication Number Publication Date
WO2007062476A1 true WO2007062476A1 (fr) 2007-06-07

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PCT/AU2006/001820 Ceased WO2007062476A1 (fr) 2005-11-30 2006-11-30 Appareil de fourniture de gaz et de lubrifiant

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US (1) US20080283212A1 (fr)
EP (1) EP1954425A4 (fr)
CN (1) CN101316667A (fr)
WO (1) WO2007062476A1 (fr)

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Publication number Publication date
EP1954425A4 (fr) 2010-01-27
EP1954425A1 (fr) 2008-08-13
CN101316667A (zh) 2008-12-03
US20080283212A1 (en) 2008-11-20

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