EP1797977A2 - Druckgießen in Feingiessformen - Google Patents

Druckgießen in Feingiessformen Download PDF

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Publication number
EP1797977A2
EP1797977A2 EP06125467A EP06125467A EP1797977A2 EP 1797977 A2 EP1797977 A2 EP 1797977A2 EP 06125467 A EP06125467 A EP 06125467A EP 06125467 A EP06125467 A EP 06125467A EP 1797977 A2 EP1797977 A2 EP 1797977A2
Authority
EP
European Patent Office
Prior art keywords
mold
container
mold cavities
metallic material
shot sleeve
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.)
Withdrawn
Application number
EP06125467A
Other languages
English (en)
French (fr)
Other versions
EP1797977A3 (de
Inventor
Russell G. Vogt
David S. Lee
John Corrigan
Debra Whitaker
Leonard L. Ervin
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.)
Howmet Corp
Original Assignee
Howmet Corp
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 Howmet Corp filed Critical Howmet Corp
Publication of EP1797977A2 publication Critical patent/EP1797977A2/de
Publication of EP1797977A3 publication Critical patent/EP1797977A3/de
Withdrawn legal-status Critical Current

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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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials

Definitions

  • the present invention relates to casting of metals and alloys and, more particularly, to casting of metals and alloys under pressure in a non-metallic investment mold.
  • Titanium based alloys e.g. Ti-6Al-4V
  • intermetallics e.g. TiAl
  • Many such cast components are made by the well known gravity investment casting process wherein an appropriate melt is cast into a preheated ceramic investment shell mold formed by the lost wax process.
  • US Patent 6 070 643 describes vacuum die casting of oxygen reactive alloys such as titanium alloys, nickel based superalloys, and cobalt superalloys in metal molds.
  • Drawbacks of using metal die casting molds include the high cost of the metal dies and the presence of die parting line between the metal dies, which parting line sometimes limits the complexity of the die cavity and thus the casting that can be die cast.
  • a further drawback of using metal dies when die casting titanium aluminide material is the generation of cracking in the casting as a result of rapid solidification of the melt in the metal mold.
  • Permanent mold casting of reactive metals and alloys such as titanium and titanium and nickel based alloys using permanent, reusable, multi-part metal molds based on iron and titanium is described in Colvin U.S. Patent 5 287 910 .
  • Casting of aluminum, copper, and iron based castings using permanent metal molds is described in U.S. Patent 5 119 865 .
  • An object of the present invention to provide method and apparatus for casting metals and alloys, especially titanium alloys, titanium aluminides and others, under pressure in an investment mold in a manner that overcomes the above-discussed disadvantages and drawbacks.
  • the present invention provides method and apparatus for casting a metallic material involving the steps of disposing a non-metallic mold in a container, holding the container with the mold therein relative to a platen of a casting machine such that one or more mold cavities communicate to a shot sleeve to receive molten metallic material therefrom, flowing the molten metallic material in the shot sleeve under pressure into the one or more mold cavities of the mold while the container is held relative to the platen, and at least partially solidifying the metallic material in the one or more mold cavities.
  • a plunger in the shot sleeve is moved in response to hydraulic fluid pressure, which is vented or returned to sump a preselected distance before the plunger reaches an end of its injection stroke so as to reduce prospect of cracking of the non-metallic mold.
  • the container includes refractory particulates about the mold to contain any metallic material leakage from the mold from mold cracking.
  • the mold comprises a ceramic investment shell mold that is cast at ambient temperature.
  • the mold cavities of the shell mold can be evacuated to subambient pressure, such as less than 100 microns, to die cast an oxygen reactive metal or alloy such as a titanium alloy, titanium aluminide, nickel base superalloy, cobalt base superalloy, and others.
  • the container includes a chamber in which the investment mold is disposed with refractory particulates disposed about the investment mold.
  • the mold can include a pour cup or other feature that is clamped to an end closure of the container.
  • the mold also typically includes a sprue passage betweeen the pour cup and the one or more mold cavities to convey molten metallic material thereto.
  • the container with the investment mold therein is held relative to a fixed (non-movable) platen of a die casting machine.
  • an end of the container can be connected to a base plate itself connected to the fixed platen of the die casting machine, or the container can be formed as part of a base plate connected to the fixed platen of the die casting machine.
  • a second, movable platen of the die casting machine can be moved to engage an opposite end of the container.
  • Another embodiment of the present invention provides casting apparatus comprising a container having a non-metallic mold disposed therein, a platen of a casting machine relative to which platen the container is held such that one or more mold cavities communicate to a shot sleeve for receiving metallic material therefrom, and means for introducing molten metallic material in the shot sleeve under pressure into the one or more mold cavities.
  • Refractory particulates are disposed in the container about the non-metallic mold.
  • the invention is useful in casting molten metals or alloys, such as titanium alloys and titanium aluminide alloys, that otherwise have difficulty in filling thin wall mold cavity regions using conventional investment casting processes.
  • the invention is useful in casting titanium alloy or titanium aluminide turbocharger compressor and turbine wheels having multiple airfoil vanes of thin wall thickness (e.g. 0.025 to 0.200 inch wall thickness) disposed about a hub.
  • the invention likewise is useful in casting compressor blades and turbine blades having thin-wall airfoils (e.g. 0.025 to 0.35 inch wall thickness.)
  • the invention can be used to cast complex investment molds having backlocks, undercuts, or other features that can not be cast using metal dies.
  • Practice of the invention permits complex mold geometries to be cast, without the high cost of metal dies, and without the need for significant chemical and/or mechanical rework of the die cast component.
  • a die casting machine 10 adapted to practice an embodiment of the present invention is shown.
  • the casting machine is shown adapted to cast a molten metallic material, which may include a thixotropic metallic material, under hydraulic pressure into an evacuated non-metallic investment shell mold 31.
  • metallic materials for casting include, but are not limited to, titanium alloys, titanium aluminide alloys, nickel base superalloys, cobalt base superalloys and other materials that have difficulty in filling certain thin or narrow regions of an investment mold cavity and/or are reactive with oxygen.
  • the non-metallic investment shell mold 31 includes first and second mold cavity-forming regions 31a, 31b that define a respective turbocharger wheel shape therein.
  • the die casting machine is shown comprising a base 11 which includes a reservoir (not shown) therein for hydraulic fluid that is used by hydraulic actuator 12 to move the movable die platen 16 relative to the fixed (stationary) die platen 14 to open and close the die platens 14, 16.
  • the platen 16 is disposed for movement on stationary guide rods or bushings 18.
  • a die platen clamping linkage mechanism (not shown) is connected to the movable die platen 16 in conventional manner not considered part of the present invention.
  • the die casting apparatus also comprises a tubular, horizontal shot sleeve 24 having intermediate section that is received in the stationary die platen 14 and a mold base plate 30 fastened to the platen 14 by conventional bolts and clamps (not shown).
  • the shot sleeve 24 extends into a vacuum melting chamber 40 where the metal or alloy to be die cast is melted under high vacuum conditions, such as less than 100 microns, in the event an oxygen reactive metal or alloy, such as titanium alloy, titanium aluminide alloy, superalloy, etc., is to be die cast.
  • the vacuum chamber 40 is defined by a vacuum housing wall 42 that extends about and encompasses or surrounds the charging end section 24a of the shot sleeve 24 and the hydraulic actuator 25'' having movable ram 25a''.
  • the chamber wall 42 is vacuum tight sealed about the stationary, horizontal shot sleeve and plunger support member 44.
  • the vacuum chamber 40 is evacuated by a conventional vacuum pump P connected to the chamber 40.
  • the base 11 and the vacuum housing wall 42 rest on a concrete floor or other suitable support.
  • a cylindrical plunger 27 is disposed in the cylindrical bore of the shot sleeve 24 for movement by movable ram 25a'' between a start injection position located to the left of a melt entry or inlet 50 in Figure 1 and a finish injection position proximate mold base plate 30.
  • the melt inlet 50 comprises a melt-receiving vessel 52 mounted on the shot sleeve 24.
  • the melt-receiving vessel 52 is disposed beneath a melting crucible 54 to receive a charge of molten metal or alloy therefrom for die casting.
  • the invention is not limited to a hydraulic plunger as means for introducing the molten metallic material under superambinet pressure into the mold 31.
  • superambient gas pressure may be applied at the end of the shot sleeve with or without the plunger present for introducing the molten metallic material under pressure into the mold 31.
  • the melting crucible 54 may be an induction skull crucible comprising copper segments in which a charge of solid metal or alloy to be die cast is melted.
  • the charge of solid metal or alloy can be positioned in the crucible 54 before a vacuum is established in chamber 40 and melted by energization of induction coils 56 after the vacuum is established.
  • the solid metal or alloy charge can be charged into the crucible 54 in evacuated chamber 40 via a vacuum port (not shown) and melted by energization of induction coils 56.
  • Known ceramic or refractory lined crucibles also can be used in practicing the present invention. Any melting method such as arc melting, electron beam melting and others may be employed in practice of the invention.
  • the crucible 54 can be tilted to pour the molten metal or alloy charge into the melt-receiving vessel 52, which is communicated to the shot sleeve 24 via an opening 58 in the shot sleeve wall.
  • the molten metal or alloy charge is introduced through opening 58 into the shot sleeve 24 in front of the plunger 27.
  • the plunger 27 is moved from the start injection position to the finish injection position by conventional hydraulic actuator 25''.
  • Typical radial clearances between the shot sleeve 24 and the plunger 27 are in the range of 0.001 to 0.008 inch.
  • the die casting machine 10 is modified or adapted to cast a molten metallic material under hydraulic pressure into an evacuated non-metallic (e.g. ceramic) investment shell mold 31, which can be made by the well known lost wax process.
  • an investment shell mold 31 is made by repeatedly dipping one or more fugitive patterns (such as wax or plastic patterns) of the component to be cast connected as part of a pattern assembly in a ceramic flour slurry, draining excess ceramic slurry, and applying a coarse ceramic stucco on the wet slurry followed by air or oven drying until a shell mold of desired wall thickness is built up on the patterns.
  • the one or more patterns then are selectively removed by steam autoclaving, flash dewaxing, and other conventional pattern removal techniques, leaving an empty ceramic shell mold with one or more cavities where the one or more patterns formerly resided.
  • the ceramic shell mold then is fired at elevated temperature to develop adequate mold strength for casting.
  • Manufacture of ceramic shell molds using the lost wax process is well known and described in US Patent 4,966,225 ; 5,983,982 ; 6,749,006 and many others.
  • the invention can be practiced using conventional colloidal silica-bonded or sodium silicate-bonded investment shell molds, although other investment shell molds can be used.
  • the particular ceramic flours and stucco materials from which the investment mold 31 is made depends on the metal or alloy to be die cast in the mold as well as the parameters of casting, such as melt superheat, mold preheat temperature and others.
  • a ceramic investment shell mold 31 for casting two turbocharger wheels is shown.
  • the shell mold 31 includes gating having a pour cup 33, a sprue 32, and first and second runners 34 communicated to two turbocharger wheel-shaped mold cavity-forming sections 31a, 31b.
  • a tubular ceramic sealing collar 38 is sealingly adhered or otherwise fastened about or formed integral with the pour cup 33. The collar 38 sealingly abuts the discharge end of the shot sleeve 24 as shown in Figure
  • the invention envisions providing a ceramic core (not shown) in the turbocharger wheel-shaped mold cavity-forming sections 31a, 31b in order to produce an internal cavity in the cast turbocharger wheel at selected location(s).
  • the ceramic core can be configured to produce the desired internal cavity in the cast turbocharger wheel, or other casting produced in the mold 31.
  • the invention also envisions providing a reinforcement material or preform, porous or solid, in the mold cavities 36 so as to be incorporated in the cast component.
  • a metal (e.g. steel) gas impermeable container 60 is provided for enclosing the investment mold 31 during the die casting method.
  • the container 60 comprises a tubular body 60a which can be circular, square or any other cross-sectional shape.
  • the container 60 includes a welded-on end closure 62.
  • the container 60 also includes a removable end closure 64 fastened to welded-on annular flange 66 by fasteners 67 in a manner to define an internal container chamber 68 in which the mold 31 is received for casting with the space about the mold 31 filled with refractory particulates 70.
  • the removable end closure 64 engages an O-ring vacuum seal S1, Figures 2 and 4, for establishing a vacuum tight seal between the end closure 64 and the annular flange 66 of the container 60, Figure 4, when the end closure 64 is fastened on the container using fasteners 67.
  • An O-ring vacuum seal S2 is provided between the end closure 62 and the base plate 30 for establishing a vacuum tight seal therebetween, Figure 1, when the container 60 is abutted to the base plate 30 as will be described below.
  • the container 60 is not permanently fastened to the base plate 30.
  • the vacuum seals S1, S2 may comprise Viton material or other suitable high temperature sealing material.
  • the container end closure 62 includes a passage 62p that is adapted to receive the shot sleeve 24, Figure 1, in flow relationship to the pour cup 33 of the mold 31 when the mold 31 is clamped in position in the container 60.
  • the container 60 includes internally thereof a plurality of elongated clamping fingers 60f that are tightened over the surface of the collar 38, Figures 1-2 and 4-5, to clamp the mold 31 in fixed position against end closure 62 in the chamber 68.
  • the clamp fingers 60f are tightened using fasteners 70' which are threaded into the end closure 62.
  • the mold 31 is shown clamped in the container 60 with its runners 34 oriented generally horizontally, the invention is not so limited since the mold 31 can be oriented in any suitable orientation such as, for example, with the runners 34 oriented generally vertically, generally horizontally or any orientation therebetween.
  • the passages of pour cup 33 and the sprue 32 of the mold communicate to the shot sleeve 24 for receiving molten metallic material from the shot sleeve 24 as pushed by the plunger 27.
  • the shot sleeve 24 is sealingly received in passage 62p.
  • the collar 38 seals against leakage of molten metallic material from the shot sleeve and the mold pour cup.
  • the container 60 includes nipples 60n to permit loose (free-flowing) refractory particulates 70, such as alumina or zirconia ceramic back-up sand, about the mold 31 in the container 60 chamber 68.
  • the nipples 60n are closed by a removable vacuum fitting F to prevent the loose particulates 70 from falling out.
  • the container 60 also includes hoist rings 60r to allow use of a conventional overhead hoist to lift and transport the container 60 for mold loading and unloading purposes.
  • a solid ingot of the metallic material to be die cast is charged into the crucible 54 in the vacuum melting chamber 40.
  • the container 60 with the investment mold 31 therein is held between the base plate 30 and the platen 16 by movement of platen 16 relative to platen 14.
  • the container 60 is filled with the loose back-up particulates 70 via nipples 60n before the container 60 is held in position relative to the fixed platen 14 by movement of the movable platen 16.
  • the loose particulates 70 are introduced manually or by machine through the nipples 60n into the chamber 68 and about the mold 31.
  • the vacuum chamber 40 then is evacuated to a suitable level for melting the particular charge (e.g.
  • the container 60 with the investment mold 31 therein held between the base plate 30 and the platen 16 is concurrently evacuated to the same vacuum level through the connection to the vacuum melting chamber 40 via the shot sleeve 24 and by virtue of being isolated from surrounding ambient air atmosphere by the container vacuum seals S1, S2.
  • the investment mold 31 typically is at ambient (room) temperature when it is placed in the container 60. Alternately, the mold 31 can be preheated to a suitable elevated temperature before being placed in the container 60 or while it is in the container using cartridge or resistance heaters.
  • the solid charge of the metal or alloy in crucible 54 is melted by energizing induction coil 56, the melt then is poured under vacuum into the shot sleeve 24 via the melt inlet 50 with the plunger 27 initially positioned at the start injection position of Figure 1.
  • the molten metal or alloy is poured into the shot sleeve 24 and resides therein for a preselected dwell time to insure that no molten metal gets behind the plunger 27.
  • the melt can be poured directly from the crucible 54 via inlet 50 into the shot sleeve 24, thereby reducing time and metal cooling before injection can begin.
  • the plunger 27 then is advanced in the shot sleeve 24 by actuator 25'' to inject the molten metal or alloy under hydraulic pressure into the mold cavities 36 via mold pour cup 33, sprue 32, and runners 34.
  • the molten metal or alloy is forced at velocities, such as 10-120 inches per second for titanium alloys and titanium aluminides, down the shot sleeve 24 and into the evacuated mold cavities 36 in the investment mold 31.
  • the plunger 27 is advanced in the shot sleeve 24 using a hydraulic system shown in Figure 6 that comprises a supply manifold 70', shot speed manifold 72' for controlling speed of the plunger, shot return manifold 74' for controlling the return of the plunger 27 to its start injection position, and a pressure dump manifold 76' for dumping or returning fluid pressure to a tank S' when the plunger 27 is a preselected distance from its final injection position.
  • the hyradulic system is controlled by a programmable logic controller (not shown).
  • the limit switch 80a which is fastened to the fixed support frame for actuator (hydraulic cylinder) 25'', is directly electrically connected to a relay (not shown) which in turn is directly electrically connected to the directional valve 27' of the pressure dump manifold 76' to control energization of the directional valve 27'.
  • the limit switch 80a is activated by the switch trip member 80b, which is fastened to the ram 25a'' and which trips or actuates limit switch 80a shown in Figure 1 as it travels with the ram.
  • the directional valve 27' is deenergized in a manner to maintain cartridge valve 28' closed (e.g.
  • valve 27' is always in a deenergized state except when the limit switch 80a is tripped).
  • the directional valve 27' is energized to vent the normallly closed pressure holding valve 28' to return tank S' via line 81 and allow hydraulic pressure downstream of the valve 28' to vent through open valve 28' to line 83 to tank S'.
  • the pressure dump manifold 76' functions to control fluid pressure on the mold 31 as the molten metallic material is injected under pressure therein so as to avoid cracking of the mold 31 during casting.
  • the location of the switch 80a and thus the preselected distance from the final injection position where fluid pressure is dumped can be determined empirically and adjusted to avoid mold cracking. Components of the hydraulic system are described below.
  • Components of the hydraulic system of Figure 6 include:
  • the base plate 30 and platen 16 are opened by movement of platen 16 away from platen 14 within a typical time period that can range from 5 to 25 seconds following injection to provide enough time for the molten metal or alloy to form at least a solidified surface on the cast component(s) in the mold cavities 36.
  • the container 60 then is removed from the base plate 30 and transported by a hoist's engaging hoist rings 60r to an unloading station where the back-up particulates 70 are removed by opening nipples 60n. Then, the end closure 64 is removed so that the melt-filled mold 31 can be unclamped and removed from the container 60.
  • the metallic material solidified in the mold cavities 36 typically is substantially solidified by the time the mold 31 is removed from the container.
  • the investment mold 31 then is removed from the die cast components by conventional techniques forming no part of the invention.
  • the castings then can be inspected visually and by techniques according to customer requirements.
  • the shot sleeve 24 contacting the molten metal or alloy can be made of an iron based material, such as H-13 tool steel, or a refractory material such as based on Mo alloy or TZM alloy, ceramic material such as alumina, graphite, or combinations thereof that are compatible with the metal or alloy being melted and die cast.
  • the forward plunger tip 27a can comprise a permanent or alternately a disposable tip that is thrown away after each molten metal or alloy charge is injected in the investment mold 31.
  • a plunger tip can comprise a copper based alloy such as a copper-beryllium alloy, or steel, graphite, or other appropriate material.
  • the particular casting parameters employed to die cast a component will depend upon several factors including mold size, gating, pour weight, and the fragility of the investment mold to the melt injection pressures involved.
  • the injection pressure is selected to retain the investment mold 31 intact (no mold cracking under pressure) while achieving a satisfactory fill of the mold cavity regions.
  • the nominal weight of metal or alloy in the crucible 54 depends on the mold size and the number of components to be die cast in the mold.
  • Turbocharger wheels have been successfully die cast of titanium and titanium aluminide (TiAl) alloys in conventional lost wax investment shell molds 31 by practice of the invention.
  • the turbocharger wheels were made using casting parameters in the following ranges: melt injection pressure settings: 400-1800 psi, melt injection velocities (plunger speed): 10-120 in/sec, melt superheat: 0 to 75 degrees F, mold preheat: room temperature to 600 degrees F, lost wax investment shell mold wall thickness: 0.20 to 1.0 inch, shot sleeve length and diameter: 15 inches and 3 inches; and limit switch 80a set to dump plunger fluid pressure when the plunger 27 is about 0.5 inch from its final injection position.
  • mold 31 is illustrated above for making cast turbocharger wheels, the invention is not so limited and can be practiced to make other components that include, but are not limited to, internal combustion engine valves, automotive or truck turbocharger compressor and turbine wheels, compressor and turbine blades and vanes for gas turbine engines, and medical components including hip stems, acetabular knees, tibial trays, and spinal components.
  • the invention has been described above with respect to separate container 60 held between base plate 30 and platen 16, the invention is not so limited and envisions in another embodiment attaching the container 60 to the base plate 30 or forming the container 60 as an integral part of base plate 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Supercharger (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP06125467A 2005-12-19 2006-12-05 Druckgießen in Feingiessformen Withdrawn EP1797977A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31191005A 2005-12-19 2005-12-19

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EP1797977A2 true EP1797977A2 (de) 2007-06-20
EP1797977A3 EP1797977A3 (de) 2008-08-06

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1797978A2 (de) * 2005-12-19 2007-06-20 Howmet Corporation Druckgießen in Einbettformen
CN102588361A (zh) * 2012-03-12 2012-07-18 常州市第一橡塑设备有限公司 液压系统
US8708033B2 (en) 2012-08-29 2014-04-29 General Electric Company Calcium titanate containing mold compositions and methods for casting titanium and titanium aluminide alloys
US8858697B2 (en) 2011-10-28 2014-10-14 General Electric Company Mold compositions
US8906292B2 (en) 2012-07-27 2014-12-09 General Electric Company Crucible and facecoat compositions
US8932518B2 (en) 2012-02-29 2015-01-13 General Electric Company Mold and facecoat compositions
US8992824B2 (en) 2012-12-04 2015-03-31 General Electric Company Crucible and extrinsic facecoat compositions
US9011205B2 (en) 2012-02-15 2015-04-21 General Electric Company Titanium aluminide article with improved surface finish
US9192983B2 (en) 2013-11-26 2015-11-24 General Electric Company Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys
US9511417B2 (en) 2013-11-26 2016-12-06 General Electric Company Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys
US9592548B2 (en) 2013-01-29 2017-03-14 General Electric Company Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys
CN107570682A (zh) * 2017-09-25 2018-01-12 广东鸿图科技股份有限公司 一种大型压铸模具的动模分拆结构及其起吊装配方法
CN107598114A (zh) * 2017-09-30 2018-01-19 嘉兴博瑞涡轮增压技术有限公司 一种涡轮增压器壳体快速生产设备及生产工艺
CN108889910A (zh) * 2018-06-29 2018-11-27 无锡范尼韦尔工程有限公司 一种载重车用重型大直径涡轮组树铸造装置及组装方法
CN109057558A (zh) * 2018-08-03 2018-12-21 太仓市大烨建筑工程有限公司 一种反锁结构门锁控制系统及其工作方法
US10391547B2 (en) 2014-06-04 2019-08-27 General Electric Company Casting mold of grading with silicon carbide

Citations (2)

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US4704079A (en) * 1984-04-02 1987-11-03 Minnesota Mining And Manufacturing Company Mold having ceramic insert
US20030121636A1 (en) * 2001-12-27 2003-07-03 Gegel Gerald A. Pressure casting using a supported shell mold

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704079A (en) * 1984-04-02 1987-11-03 Minnesota Mining And Manufacturing Company Mold having ceramic insert
US20030121636A1 (en) * 2001-12-27 2003-07-03 Gegel Gerald A. Pressure casting using a supported shell mold

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1797978A3 (de) * 2005-12-19 2008-07-23 Howmet Corporation Druckgießen in Einbettformen
EP1797978A2 (de) * 2005-12-19 2007-06-20 Howmet Corporation Druckgießen in Einbettformen
US8858697B2 (en) 2011-10-28 2014-10-14 General Electric Company Mold compositions
US9011205B2 (en) 2012-02-15 2015-04-21 General Electric Company Titanium aluminide article with improved surface finish
US9802243B2 (en) 2012-02-29 2017-10-31 General Electric Company Methods for casting titanium and titanium aluminide alloys
US8932518B2 (en) 2012-02-29 2015-01-13 General Electric Company Mold and facecoat compositions
CN102588361A (zh) * 2012-03-12 2012-07-18 常州市第一橡塑设备有限公司 液压系统
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