Source: http://www.google.com/patents/US7543383?dq=inventor:%22Arthur+R.+Hair%22&ei=VAy0Tsa4NYTl0QGQiqWiBA
Timestamp: 2016-05-30 15:41:52
Document Index: 288095728

Matched Legal Cases: ['art 42', 'art 44', 'art 42', 'art 44', 'arts 42', 'art 44', 'art 42', 'art 42', 'art 44', 'art 42', 'art 44', 'art 42', 'art 44', 'art 80']

Patent US7543383 - Method for manufacturing of fuel nozzle floating collar - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA floating collar is metal injected moulded with an excess portion intended to be separated, such as by shearing, from the reminder of the moulded floating collar to leave a chamfer thereon and/or remove injection marks....http://www.google.com/patents/US7543383?utm_source=gb-gplus-sharePatent US7543383 - Method for manufacturing of fuel nozzle floating collarAdvanced Patent SearchPublication numberUS7543383 B2Publication typeGrantApplication numberUS 11/782,234Publication dateJun 9, 2009Filing dateJul 24, 2007Priority dateJul 24, 2007Fee statusPaidAlso published asCA2694163A1, EP2027955A2, EP2027955A3, EP2027955B1, US8056232, US8099867, US20090025224, US20090211097, US20090214375, WO2009012556A1Publication number11782234, 782234, US 7543383 B2, US 7543383B2, US-B2-7543383, US7543383 B2, US7543383B2InventorsBhawan B. Patel, Lorin Markarian, Melissa DespresOriginal AssigneePratt & Whitney Canada Corp.Export CitationBiBTeX, EndNote, RefManPatent Citations (99), Non-Patent Citations (25), Referenced by (12), Classifications (10), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod for manufacturing of fuel nozzle floating collar
US 7543383 B2Abstract
A floating collar is metal injected moulded with an excess portion intended to be separated, such as by shearing, from the reminder of the moulded floating collar to leave a chamfer thereon and/or remove injection marks.
1. A method of manufacturing a floating collar adapted to be slidably engaged on a fuel nozzle for providing a sealing interface between the fuel nozzle and a combustor wall, the method comprising: metal injection moulding a generally cylindrical part having an axis, a collar portion and a sacrificial portion, the sacrificial portion including at least a shoulder projecting radially inwardly from one end of said collar portion along a circumferential wall of the collar portion, the shoulder and the circumferential wall defining a corner, and while the cylindrical part is still in a substantially dry green condition, forming a chamfer at said one end of said collar portion on an inside diameter of the collar portion by applying axially opposed shear forces on opposed sides of the corner to shear off the sacrificial portion from said collar portion along a shearing line extending angularly outwardly from said corner.
2. The method defined in claim 1, wherein said shoulder has a shoulder thickness which is less than a wall thickness of said circumferential wall of said collar portion.
3. The method defined in claim 1, wherein metal injection moulding comprises injecting feedstock in a region of a mould corresponding to the sacrificial portion.
4. The method defined in claim 1, comprising removing injection marks left in a surface of the generally cylindrical part as a result of the metal injection moulding step by separating the sacrificial portion from the collar portion, the injection marks being contained in the sacrificial portion.
5. The method defined in claim 1, wherein forming a chamfer comprises applying an axial load on said shoulder and supporting said one end of said collar portion radially outwardly of said corner.
6. The method defined in claim 1, further comprising debinding and sintering the collar portion after the sacrificial portion has been separated therefrom. Description
The invention relates generally to gas turbine engine combustors and, more particularly, to a method of manufacturing a fuel nozzle floating collar therefor.
Gas turbine combustors are typically provided with floating collar assemblies or seals to permit relative radial or lateral motion between the combustor and the fuel nozzle while minimizing leakage therebetween. Machined floating collars are expensive to manufacture at least partly due to the need for an anti-rotating tang or the like to prevent rotation of the collar about the fuel nozzle tip. This anti-rotation feature usually prevents the part from being simply turned requiring relatively expensive milling operations and results in relatively large amount of scrap material during machining.
There is thus a need for further improvements in the manufacture of fuel nozzle floating collars.
In one aspect, there is provided a method of manufacturing a floating collar adapted to be slidably engaged on a fuel nozzle for providing a sealing interface between the fuel nozzle and a combustor wall, the method comprising: metal injection moulding a generally cylindrical part having an axis, a collar portion and a sacrificial portion, the sacrificial portion including at least a shoulder projecting radially inwardly from one end of said collar portion along an inner circumferential wall of the collar portion, the shoulder and the circumferential wall defining a corner, and while the cylindrical part is still in a substantially dry green condition forming a chamfer at said one end of said collar portion on an inside diameter of the collar portion by applying axially opposed shear forces on opposed sides of the corner to shear off the sacrificial portion from said collar portion along a shearing line extending angularly outwardly from said corner.
In a second aspect, there is provided a method for manufacturing a floating collar adapted to provide a sealing interface between a fuel nozzle and a gas turbine engine combustor, comprising: a) metal injection moulding a green part including a floating collar portion and a feed inlet portion, the feed inlet portion bearing injection marks corresponding to the points of injection, b) separating the feed inlet portion from the floating collar portion to obtain a floating collar free of any injection marks, and c) debinding and sintering the floating collar portion
FIG. 1 is a schematic cross-sectional view of a gas turbine engine having an annular combustor;
FIG. 2 is an enlarged cross-sectional view of a dome portion of the combustor illustrating a floating collar slidably mounted about a fuel nozzle tip and axially trapped between a heat shield and a combustor dome panel;
FIG. 3 is an isometric view of the floating collar shown in FIG. 2;
FIG. 4 is a cross-sectional view of a mould used to form the floating collar;
FIG. 5 is a cross-sectional view of the moulded green part obtained from the metal injection moulding operation, the feed inlet material to be discarded being shown in dotted lines;
FIG. 6 is a cross-sectional schematic view illustrating how the moulded green part is sheared to separate the collar from the material to be discarded; and
FIG. 7 is a cross-section view of the collar after the shearing operation, the sheared surface forming a chamfer on the inside diameter of the collar.
The combustor 16 is housed in a plenum 17 supplied with compressed air from compressor 14. The combustor 16 has a reverse flow annular combustor shell 20 including a radially inner liner 20 a and a radially outer liner 20 b defining a combustion chamber 21. As shown in FIG. 2, the combustor shell 20 has a bulkhead or inlet dome portion 22 including an annular end wall or dome panel 22 a. A plurality of circumferentially distributed dome heat shields (only one being shown at 24) are mounted inside the combustor 16 to protect the dome panel 22 a from the high temperatures in the combustion chamber 21. The heat shields 24 can be provided in the form of high temperature resistant casting-made arcuate segments assembled end-to-end to form a continuous 360� annular band on the inner surface of the dome panel 22 a. Each heat shield 24 has a plurality of threaded studs 25 extending from a back face thereof and through corresponding mounting holes defined in the dome panel 22 a. Fasteners, such as self-locking nuts 27, are threadably engaged on the studs from outside of the combustor 16 for securely mounting the dome heat shields 24 to the dome panel 22 a. As shown in FIG. 2, the heat shields 24 are spaced from the dome panel 22 a by a distance of about 0.1 inch so as to define an air gap 29. In use, cooling air is admitted in the air gap 29 via impingement holes (not shown) defined though the dome panel 22 a in order to cool down the heat shields 24.
As shown in FIGS. 2 and 3, each fuel nozzle 28 is associated with a floating collar 32 to facilitate fuel nozzle engagement with minimum air leakage while maintaining relative movement of the combustor 16 and the fuel nozzle 28. Each floating collar 32 comprises an axially extending cylindrical portion 36 and a radially extending flange portion 34 integrally provided at a front end of the axially extending cylindrical portion 36. The axially extending cylindrical portion 36 defines a central passage 35 for allowing the collar 32 to be axially slidably engaged on the tip portion of the fuel nozzle 28. First and second inner diameter chamfers 37 and 39 are provided at opposed ends of the collar 32 to eliminate any sharp edges that could interfere with the sliding movement of the collar 32 on the fuel nozzle 28. The chamfers 37 and 39 extend all around the inner circumference of the collar 32. The radially extending flange portion 34 is axially sandwiched in the air gap 29 between the heat shield 24 and the dome panel 22 a. An anti-rotation tang 38 extends radially from flange portion 34 for engagement in a corresponding slot (not shown) defined in a rearwardly projecting surface of the heat shield 24.
As can be appreciated from FIG. 4, the floating collar 32 can be produced by metal injection moulding (MIM). The MIM process is preferred as being a cost-effective method of forming precise net-shape metal components. The MIM process eliminates costly secondary machining operations. The manufacturing costs can thus be reduced. The floating collar 32 is made from a high temperature resistant powder injection moulding composition. Such a composition can include powder metal alloys, such as IN625 Nickel alloy, or ceramic powders or mixtures thereof mixed with an appropriate binding agent. Other high temperature resistant compositions could be used as well. Other additives may be present in the composition to enhance the mechanical properties of the floating collar (e.g. coupling and strength enhancing agents).
As shown in FIG. 4, the molten metal slurry used to form the floating collar 32 is injected in a mould assembly 40 comprising a one-piece male part 42 axially insertable into a two-piece female part 44. The metal slurry is injected in a mould cavity 46 defined between the male part 42 and the female part 44. The gap between the male and female parts 42 and 44 corresponds to the desired thickness of the walls of the floating collar 32. The female part 44 is preferably provided in the form of two separable semi-cylindrical halves 44 a and 44 b to permit easy unmoulding of the moulded green part.
The male part 42 has a disc-shaped portion 48, an intermediate cylindrical portion 50 projecting axially centrally from the disc-shaped portion 48 and a terminal frusto-conical portion 52 projecting axially centrally from the intermediate cylindrical portion 50 and tapering in a direction away from the intermediate cylindrical portion 50. An annular chamfer 54 is defined in the male part 42 between the disc-shaped portion 48 and the intermediate cylindrical portion 50. The annular chamfer 54 is provided to form the inner diameter chamfer 39 of the collar 32. An annular shoulder 56 is defined between the intermediate cylindrical portion 50 and the bottom frusto-conical portion 52.
The female part 44 defines a central stepped cavity including a rear shallow disc-like shaped cavity 58, a cylindrical intermediate cavity 60 and a front or feed inlet cylindrical cavity 62. The disc-like shaped cavity 58, the intermediate cavity 60 and the feed cavity 62 are aligned along a central common axis A. The disc-like shaped cavity 58 has a diameter d1 greater than the diameter d2 of the intermediate cavity 60. Diameter d2 is, in turn, greater than the diameter d3 of the feed cavity 62. The disc-like shaped cavity 58, the intermediate cavity 60 and the feed cavity 62 are respectively circumscribed by concentric cylindrical sidewalls 64, 66 and 68. First and second axially spaced-apart annular shoulders 70 and 72 are respectively provided between the disc-like cavity 58 and the intermediate cavity 60, and the intermediate cavity 60 and the front cavity 62.
After the male part 42 and the female part 44 have been inserted into one another with a peripheral portion of the disc-like shaped portion 48 of the male part 42 sealingly abutting against a corresponding annular surface 74 of the female part 44, the mould cavity 46 is filled with the feedstock (i.e. the metal slurry) by injecting the feedstock axially endwise though the feed cavity 62 about the frusto-conical portion 52, as depicted by arrows 74.
After a predetermined setting period, the mould assembly 40 is opened to reveal the moulded green part shown in FIG. 5. The moulded green part comprises a floating collar portion 32′ and a sacrificial or “discardeable” feed inlet portion 76 (shown in dotted lines) to be separated from the collar portion 32′ and discarded. As can be appreciated from FIG. 5, the collar portion 32′ has a built-in flange 34′ and an inner diameter chamfer 39′ respectively corresponding to flange 34 and chamfer 39 on the finished collar product shown in FIG. 3, but still missed the inner diameter chamfer 37 at the opposed end of the floating collar. As will be seen hereinafter, the chamfer 37 is subsequently formed by separating the sacrificial portion 76 from the collar portion 32′.
In the illustrated example, the sacrificial feed inlet portion 76 comprises a shoulder 78 extending radially inwardly from one end of the collar portion 32′ opposite to flange 34′ and an axially projecting hollow cylindrical part 80. The shoulder 78 extends all around the entire inner circumference of the collar portion 32′. The shoulder 78 and the cylindrical wall 81 of the collar portion 32′ define a sharp inner corner 82. The sharp inner corner 82 is a high stress concentration region where the moulded green part will first start to crack if a sufficient load is applied on shoulder 78. Also can be appreciated from FIG. 5, the thickness T1 of the shoulder 78 is less than the wall thickness T2 of the collar portion 32′. The shoulder 78 is thus weaker than the cylindrical wall 81 of the collar 32′, thereby providing a suitable “frangible” or “breakable” area for separating the sacrificial feed inlet portion 76 from the collar portion 32′.
As schematically shown in FIG. 6, the sacrificial feed inlet portion 76 can be separated from the collar portion 32′ by shearing. The shearing operation is preferably conducted while the part is still in a dry green state. In this state, the part is brittle and can therefore be broken into pieces using relatively small forces. As schematically depicted by arrows 84 and 86, the moulded green part is uniformly circumferentially supported underneath flange 34′ and shoulder 78. An axially downward load 88 is applied at right angles on the inner shoulder 78 uniformly all along the circumference thereof. A conventional flat headed punch (not shown) can be used to apply load 88. The load 88 or shearing force is applied next to inner corner 82 and is calibrated to shear off the sacrificial portion 80 from the collar portion 32′. As shown in dotted lines in FIG. 6, the crack initiates from the corner 88 due to high stress concentration and extends angularly outwardly towards the outer support 86 at an angle θ comprised between 40-50 degrees, thereby leaving a sheared chamfer 37′ (see FIG. 7) on the inner diameter of the separated collar portion 32′. The shear angle θ can be adjusted by changing the diameter of the outer support 86. For instance, if the diameter of the outer support 86 is reduced so as to be closer to the inner corner 82, the shear angle θ will increase. Accordingly, the location of the intended shear line can be predetermined to consistently and repeatedly obtain the desired inner chamfer at the end of the MIM floating collars. This avoids expensive secondary machining operations to form chamfer 37. The sheared chamfer 37 has a surface finish which is a rougher than a machined or moulded surface, but is designed to remain within the prescribed tolerances. There is thus no need to smooth out the surface finish of the sheared chamfer 37. Also, since the sacrificial portion 76 bears the injection marks left in the moulded part at the points of injection, there is no need for secondary machining of the remaining collar portion 32′ in order to remove the injection marks.
Once separated from the collar portion 32′, the sacrificial feed inlet portion 76 can be recycled by mixing with the next batch of metal slurry. The remaining collar portion 32′ obtained from the shearing operation is shown in FIG. 7 and is then subject to conventional debinding and sintering operations in order to obtain the final net shape part shown in FIG. 3.
The above description is meant to be exemplary only, and one skilled in the art will recognize that changes may be made to the embodiments described without departing from the scope of the invention disclosed. For example, a line of weakening could be integrally moulded into the part or cut into the surface of the moulded part to provide a stress concentration region or frangible interconnection between the portion to be discarded and the floating collar portion. Also, it is understood that the part to be discarded could have various configurations and is thus limited to the configuration exemplified in FIGS. 5 and 6. Still other modifications which fall within the scope of the present invention will be apparent to those skilled in the art, in light of a review of this disclosure, and such modifications are intended to fall within the appended claims.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS1751448Jun 20, 1928Mar 18, 1930Harris Calorific CoBlowpipe tip and process of making sameUS2468824Nov 23, 1944May 3, 1949Air ReductionMultipiece cutting tipUS2669090Jan 13, 1951Feb 16, 1954Lanova CorpCombustion chamberUS2694245Nov 28, 1950Nov 16, 1954Bendix Aviat CorpMolding of ceramicsUS2775566Feb 6, 1953Dec 25, 1956Aerovox CorpBinder for agglomerating finely divided materialsUS2939199Aug 7, 1953Jun 7, 1960Int Standard Electric CorpFormation of ceramic mouldingsUS3169367Jul 18, 1963Feb 16, 1965Westinghouse Electric CorpCombustion apparatusUS3266893Jun 17, 1965Aug 16, 1966Electric Storage Battery CoMethod for manufacturing porous sinterable articlesUS3351688Sep 18, 1964Nov 7, 1967Lexington Lab IncProcess of casting refractory materialsUS3410684Jun 7, 1967Nov 12, 1968Chrysler CorpPowder metallurgyUS3413704Nov 26, 1965Dec 3, 1968Aerojet General CoMethod of making composite ultrathin metal platelet having precisely controlled pattern of flow passages thereinUS3416905Jun 25, 1965Dec 17, 1968Lexington Lab IncProcess for manufacture of porous abrasive articlesUS3523148Jan 4, 1968Aug 4, 1970Battelle Development CorpIsostatic pressure transmitting apparatus and methodUS3595025Jul 9, 1969Jul 27, 1971Messerschmitt Boelkow BlohmRocket engine combustion chamberUS3608309May 21, 1970Sep 28, 1971Gen ElectricLow smoke combustion systemUS3615054Sep 24, 1965Oct 26, 1971Aerojet General CoInjectorsUS3698849Apr 8, 1969Oct 17, 1972Shell Oil CoInjection molding assemblyUS3704499Oct 6, 1970Dec 5, 1972IttMethod of producing a nozzle for a turbogeneratorUS3775352Mar 22, 1971Nov 27, 1973Shell Oil CoMetal-polymer matrices and their preparationUS3782989Dec 31, 1970Jan 1, 1974Owens Illinois IncPolymeric based compositionUS3888663Oct 27, 1972Jun 10, 1975Federal Mogul CorpMetal powder sintering processUS3889349Jun 8, 1973Jun 17, 1975Ford Motor CoBrazing metal alloysUS3925983Apr 17, 1974Dec 16, 1975Us Air ForceTranspiration cooling washer assemblyUS3982778Mar 13, 1975Sep 28, 1976Caterpillar Tractor Co.Joint and process for forming sameUS4011291Sep 2, 1975Mar 8, 1977Leco CorporationApparatus and method of manufacture of articles containing controlled amounts of binderUS4029476Feb 12, 1976Jun 14, 1977A. Johnson & Co. Inc.Brazing alloy compositionsUS4076561Oct 15, 1976Feb 28, 1978General Motors CorporationMethod of making a laminated rare earth metal-cobalt permanent magnet bodyUS4094061Nov 12, 1975Jun 13, 1978Westinghouse Electric Corp.Method of producing homogeneous sintered ZnO non-linear resistorsUS4197118Apr 12, 1976Apr 8, 1980Parmatech CorporationManufacture of parts from particulate materialUS4225345Aug 8, 1978Sep 30, 1980Adee James MProcess for forming metal parts with less than 1 percent carbon contentUS4226088Feb 22, 1978Oct 7, 1980Hitachi, Ltd.Gas turbine combustorUS4236923Nov 14, 1978Dec 2, 1980Toyota Jidosha Kogyo Kabushiki KaishaMethod of metallurgically joining a fitting to a shaftUS4246757Mar 27, 1979Jan 27, 1981General Electric CompanyCombustor including a cyclone prechamber and combustion process for gas turbines fired with liquid fuelUS4274875Jul 19, 1978Jun 23, 1981Brico Engineering LimitedPowder metallurgy process and productUS4280973Nov 14, 1979Jul 28, 1981Ford Motor CompanyProcess for producing Si3 N4 base articles by the cold press sinter methodUS4283360Feb 7, 1980Aug 11, 1981Asahi Glass Company, Ltd.Process for producing molded ceramic or metalUS4386960Aug 24, 1981Jun 7, 1983General Electric CompanyElectrode material for molten carbonate fuel cellsUS4415528Mar 20, 1981Nov 15, 1983Witec Cayman Patents, LimitedMethod of forming shaped metal alloy parts from metal or compound particles of the metal alloy components and compositionsUS4419413Feb 23, 1982Dec 6, 1983Nippon Piston Ring Co., Ltd.Powder molding method and powder compression molded composite article having a rest-curve like boundaryUS4472350Jun 9, 1983Sep 18, 1984Nippon Piston Ring Co., Ltd.Method of making a compound valve seatUS4475344Feb 16, 1982Oct 9, 1984Westinghouse Electric Corp.Low smoke combustor for land based combustion turbinesUS4535518Sep 19, 1983Aug 20, 1985Rockwell International CorporationMethod of forming small-diameter channel within an objectUS4590769Jan 12, 1981May 27, 1986United Technologies CorporationHigh-performance burner constructionUS4615735Sep 18, 1984Oct 7, 1986Kaiser Aluminum & Chemical CorporationIsostatic compression technique for powder metallurgyUS4661315Feb 14, 1986Apr 28, 1987Fine Particle Technology Corp.Method for rapidly removing binder from a green bodyUS4702073Mar 10, 1986Oct 27, 1987Melconian Jerry OVariable residence time vortex combustorUS4708838Mar 26, 1985Nov 24, 1987Gte Laboratories IncorporatedMethod for fabricating large cross section injection molded ceramic shapesUS4734237May 15, 1986Mar 29, 1988Allied CorporationProcess for injection molding ceramic composition employing an agaroid gell-forming material to add green strength to a preformUS4765950Oct 7, 1987Aug 23, 1988Risi Industries, Inc.Process for fabricating parts from particulate materialUS4780437Feb 11, 1987Oct 25, 1988The United States Of America As Represented By The United States Department Of EnergyFabrication of catalytic electrodes for molten carbonate fuel cellsUS4783297Jun 12, 1986Nov 8, 1988Ngk Insulators, Ltd.Method of producing ceramic partsUS4792297Sep 28, 1987Dec 20, 1988Wilson Jerome LInjection molding apparatusUS4816072Sep 1, 1987Mar 28, 1989The Dow Chemical CompanyDispersion process for ceramic green bodyUS4839138Mar 10, 1988Jun 13, 1989Miba Sintermetall AktiengesellschaftProcess of making a sintered moldingUS4874030Mar 22, 1989Oct 17, 1989Air Products And Chemicals, Inc.Blends of poly(propylene carbonate) and poly(methyl methacrylate) and their use in decomposition moldingUS4881431May 23, 1988Nov 21, 1989Fried. Krupp Gesellscahft mit beschrankter HaftungMethod of making a sintered body having an internal channelUS4898902Jun 27, 1988Feb 6, 1990Adeka Fine Chemical Co., Ltd.Binder composition for injection moldingUS4913739Mar 8, 1985Apr 3, 1990Kernforschungszentrum Karlsruhe GmbhMethod for powder metallurgical production of structural parts of great strength and hardness from Si-Mn or Si-Mn-C alloyed steelsUS5021208May 14, 1990Jun 4, 1991Gte Products CorporationMethod for removal of paraffin wax based binders from green articlesUS5059387Jun 2, 1989Oct 22, 1991Megamet IndustriesMethod of forming shaped components from mixtures of thermosetting binders and powders having a desired chemistryUS5059388Oct 4, 1989Oct 22, 1991Sumitomo Cement Co., Ltd.Process for manufacturing sintered bodiesUS5064463Jan 14, 1991Nov 12, 1991Ciomek Michael AFeedstock and process for metal injection moldingUS5094810Oct 26, 1990Mar 10, 1992Shira Chester SMethod of making a golf club head using a ceramic moldUS5098469Sep 12, 1991Mar 24, 1992General Motors CorporationPowder metal process for producing multiphase NI-AL-TI intermetallic alloysUS5129231Mar 12, 1990Jul 14, 1992United Technologies CorporationCooled combustor dome heatshieldUS5135712Aug 7, 1990Aug 4, 1992Sumitomo Metal Mining Company LimitedProcess for producing injection-molded sinterings by powder metallurgyUS5155158Nov 7, 1989Oct 13, 1992Hoechst Celanese Corp.Moldable ceramic compositionsUS5165226Aug 9, 1991Nov 24, 1992Pratt & Whitney Canada, Inc.Single vortex combustor arrangementUS5215946Aug 5, 1991Jun 1, 1993Allied-Signal, Inc.Preparation of powder articles having improved green strengthUS5244623May 10, 1991Sep 14, 1993Ferro CorporationMethod for isostatic pressing of formed powder, porous powder compact, and composite intermediatesUS5250244Jul 10, 1992Oct 5, 1993Ngk Spark Plug Company, Ltd.Method of producing sintered ceramic bodyUS5279787Apr 29, 1992Jan 18, 1994Oltrogge Victor CHigh density projectile and method of making same from a mixture of low density and high density metal powdersUS5284615Jul 15, 1992Feb 8, 1994Mitsubishi Materials CorporationMethod for making injection molded soft magnetic materialUS5286767Mar 28, 1991Feb 15, 1994Allied Signal Inc.Modified agar and process for preparing modified agar for use ceramic composition to add green strength and/or improve other properties of a preformUS5286802Apr 30, 1991Feb 15, 1994Dai-Ichi Ceramo Co., LimitedInjection compacting composition for preparing sintered body of metal powder and sintered body prepared therefromUS5307637Jul 9, 1992May 3, 1994General Electric CompanyAngled multi-hole film cooled single wall combustor dome plateUS5310520Jan 29, 1993May 10, 1994Texas Instruments IncorporatedCircuit system, a composite material for use therein, and a method of making the materialUS5312582Feb 4, 1993May 17, 1994Institute Of Gas TechnologyPorous structures from solid solutions of reduced oxidesUS5328657Feb 26, 1992Jul 12, 1994Drexel UniversityMethod of molding metal particlesUS5332537Dec 17, 1992Jul 26, 1994Pcc Airfoils, Inc.Method and binder for use in powder moldingUS5338617Nov 30, 1992Aug 16, 1994Motorola, Inc.Radio frequency absorbing shield and methodUS5350558Aug 4, 1993Sep 27, 1994Idemitsu Kosan Co., Ltd.Methods for preparing magnetic powder material and magnet, process for preparaton of resin composition and process for producing a powder molded productUS5366679May 27, 1992Nov 22, 1994L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges ClaudeProcess for thermal debinding and sintering of a workpieceUS5368795Oct 1, 1993Nov 29, 1994Ferro CorporationUse of ethylene/vinyl acetate polymer binders as drying pressing aids for ceramic powdersUS5380179Mar 16, 1993Jan 10, 1995Kawasaki Steel CorporationBinder system for use in the injection molding of sinterable powders and molding compound containing the binder systemUS5397531Jun 2, 1993Mar 14, 1995Advanced Materials Technologies Pte LimitedInjection-moldable metal feedstock and method of forming metal injection-molded articleUS5398509Aug 29, 1994Mar 21, 1995Rolls-Royce, PlcGas turbine engine combustorUS5403542Feb 10, 1994Apr 4, 1995Sandvik AbSintered carbonitride alloy with highly alloyed binder phaseUS5409650Aug 17, 1992Apr 25, 1995T&N Technology LimitedMolding finely divided sinterable materialUS5415830Oct 14, 1993May 16, 1995Advanced Materials Technologies Pte LtdBinder for producing articles from particulate materialsUS5421853Aug 9, 1994Jun 6, 1995Industrial Technology Research InstituteHigh performance binder/molder compounds for making precision metal part by powder injection moldingUS5423899Jul 16, 1993Jun 13, 1995Newcomer Products, Inc.Dispersion alloyed hard metal composites and method for producing sameUS5429792May 27, 1994Jul 4, 1995Hoeganaes CorporationMetal powder compositions containing binding agents for elevated temperature compactionUS5437825Apr 11, 1994Aug 1, 1995Lanxide Technology Company, LpPolymer precursor for silicon carbide/aluminum nitride ceramicsUS5450724Aug 27, 1993Sep 19, 1995Northern Research & Engineering CorporationGas turbine apparatus including fuel and air mixerUS5472143Sep 29, 1993Dec 5, 1995Boehringer Ingelheim International GmbhAtomising nozzle and filter and spray generation deviceUS5476632Sep 9, 1992Dec 19, 1995Stackpole LimitedPowder metal alloy processUS5482671Sep 23, 1994Jan 9, 1996Fischerwerke, Artur Fischer Gmbh & Co. KgMethod of manufacturing interlocking partsUS5525293Nov 4, 1994Jun 11, 1996Kabushiki Kaisha Kobe Seiko ShoPowder metallurgical binder and powder metallurgical mixed powderNon-Patent CitationsReference1"An Introduction to Powder Metallurgy Materials and Design", Isabel J van Rooyen, Metals and Metals Processes, CSIR, Private bag X28, Auckland Park, 2006, South Africa.2"Injection Molding Microstructures"; www.ecs.umass.edu, 2006.3"Medical Plant Tour: Metal injection molding smiles", Injection Molding Magazine, Aug. 2002, the 3rd paragraph.4"Powder Injection Molding"; www.powdermetinc.com/Technology.htm, 2006.5"The MIM Process"; www.epma.com, 1999.6Axom.com; "Low Pressure Powder Injection Moulding of Metals, Ceramics and Metal Matrix Composites"; www.azom.com, 1999.7Azom.com; "Powder Injection Moulding of Metals, Ceramics and Metal Matrix Composites"; www.azom.com, Feb. 1999.8Ceramic Industry; Ceratechno '06; Nov. 7-11, 2006; "Advancing Components with Low-Pressure Injection Molding"; www.ceramicindustry.com.9COBEF (Congresso Braileiro de Engenharia de Fabricacao); Paulo C�sar G. Felix; Philip Frank Blazdel; Ricardo Emilio F.Q Nogueria; "Production of Complex Parts by Low-Pressure Injection Molding of Granite Powders" 2001.10Egide; "Advanced Material Injection Moulding (AMIM)" 2006.11Goceram; "Medium Pressure Injection Moulding Machines"; www.goceram.com, 2006.12Goceram; "Medium Pressure Powder Injection Molding (MEDPIMOLD) Process"; www.goceram.com, 2006.13J.E. Zorzi; C.A. Perottoni; J.A. H. de Jornada; "Wax-Based Binder for Low-Pressure Injection Molding and the Robust Proudction of Ceramic Parts" 2004.14Nato: "Metal Injection Moulding: A Near Net Shape Fabrication Method for the Manufacture of Turbine Engine Component", Benoit Julien et al., pp. 8-1 to 8-16, 2006.15Nato: "Powder Injection Molding (PIM) for Low Cost Manufacturing of Intricate Parts to Net-Shape", Eric Baril et al., pp. 7-1 to 7-12, 2006.16NMC: "Enhanced Powder Metallurgy Processing of Superalloys for Aircraft Engine Components" 2005.17Peltsman; "Automatic LPM Machine MIGL -37"; www.pelcor.com, 2006.18Peltsman; "Low Pressure Injection Molding"; www.pelcor.com, 2006.19Phillips Plastics Corporation; "MIM Metal Injection Molding Design Guide"; Nov. 12, 2004; www.phillipsmetals.com.20Polymer Technologies, Inc.; "Plastic and Metal Injection Molding"; www.polymertechnologies.com, 2006.21Powder Metallurgy 2007 Facts- "A Growth Industry Vital to Many Products"; Metal Powder Industries Federation, 2007.22Power Injection Moulding International (PIM International) "Flexibility Helps MIM Producer Meet the Demands of a Broad Client Base", 2006.23TEMS-a division of ND Industries, Inc.; "Low Pressure Injection Overmolding Ruggedizing Electrical/Electronic Components"; www.temsnd.com, Mar. 7, 2006.24U.S. Appl. No. 11/551,021, filed Oct. 19, 2006, Stastny et al.25U.S. Appl. No. 60/139,354, filed Jun. 15, 1999, Lasalle, et al.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7654000 *May 22, 2007Feb 2, 2010Pratt & Whitney Canada Corp.Modular fuel nozzle and method of makingUS7861530 *Mar 30, 2007Jan 4, 2011Pratt & Whitney Canada Corp.Combustor floating collar with louverUS8056232 *Nov 15, 2011Pratt & Whitney Canada Corp.Method for manufacturing of fuel nozzle floating collarUS8099867 *May 4, 2009Jan 24, 2012Pratt & Whitney Canada Corp.Method for manufacturing of fuel nozzle floating collarUS8689563 *Jul 13, 2009Apr 8, 2014United Technologies CorporationFuel nozzle guide plate mistake proofingUS20070234569 *May 22, 2007Oct 11, 2007Prociw Lev AModular fuel nozzle and method of makingUS20080236169 *Mar 30, 2007Oct 2, 2008Eduardo HawieCombustor floating collar with louverUS20090211097 *May 4, 2009Aug 27, 2009Patel Bhawan BMethod for manufacturing of fuel nozzle floating collarUS20090214375 *May 4, 2009Aug 27, 2009Patel Bhawan BMethod for manufacturing of fuel nozzle floating collarUS20110005231 *Jan 13, 2011United Technologies CorporationFuel nozzle guide plate mistake proofingUS20160003589 *Jul 1, 2014Jan 7, 2016True Velocity, Inc.Lightweight polymer ammunition cartridge casingsWO2015061068A1 *Oct 13, 2014Apr 30, 2015United Technologies CorporationSystem and apparatus for combustion swirler anti-rotation* Cited by examinerClassifications U.S. Classification29/890.142, 29/890.14International ClassificationB21K21/08Cooperative ClassificationY10T29/4981, Y10T29/49428, Y10T29/49799, Y10T29/4998, Y10T29/49432, B22F3/22European ClassificationB22F3/22Legal EventsDateCodeEventDescriptionSep 28, 2007ASAssignmentOwner name: PRATT & WHITNEY CANADA CORP., CANADAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PATEL, BHAWAN B.;MARKARIAN, LORIN;DESPRES, MELISSA;REEL/FRAME:019893/0912;SIGNING DATES FROM 20070817 TO 20070823Oct 1, 2012FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services