WO1997018074A1 - Fabrication of tooling by thermal spraying - Google Patents
Fabrication of tooling by thermal spraying Download PDFInfo
- Publication number
- WO1997018074A1 WO1997018074A1 PCT/US1996/017932 US9617932W WO9718074A1 WO 1997018074 A1 WO1997018074 A1 WO 1997018074A1 US 9617932 W US9617932 W US 9617932W WO 9718074 A1 WO9718074 A1 WO 9718074A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- shell
- matrix
- spray
- stage
- Prior art date
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/003—Moulding by spraying metal on a surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/565—Consisting of shell-like structures supported by backing material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
- C23C4/185—Separation of the coating from the substrate
Definitions
- the present invention relates to the art of fabricating tools by thermal spraying of metals.
- a composite article can be formed in a mold having an internal shape corresponding to the shape of the desired article.
- Tools for fabrication of small parts are often machined from solid metals, using conventional machining techniques. These techniques are impractical in the case of very large molds, having dimensions of a meter or more.
- Composite parts used in the airframes must meet exacting standards for fit and finish and often inco ⁇ orate complex curved surfaces.
- certain particularly useful composites, such as carbon-fiber reinforced graphite composites must be molded at relatively high temperatures.
- Molds formed from nickel alloys having low coefficients of thermal expansion are preferred for molding these materials.
- the cost of machining very large molds from solid blocks of these metals is prohibitive.
- Various proposals have been advanced for forming tools by providing a matrix having a shape corresponding to that of the part and then depositing metal on the matrix to form the tool.
- tools can be made by a process known as electroforming, in which the metal forming the tool is electroplated onto the matrix until a sufficient thickness of metal has been built up. Electroforming is slow and expensive and impractical for very large tools.
- many metals which are useful for tooling such as stainless steel and certain nickel-containing alloys cannot be electroformed readily. It has also been proposed to fabricate tools by thermal spraying of metals onto the matrix.
- thermal spraying refers to a process in which a metal is heated to convert it to droplets of molten metal; the droplets are sprayed onto a solid matrix and the deposited droplets solidify.
- thermal spraying include flame spraying in which the metal is melted to form the droplets by passing it through a flame; arc spraying, in which the metal is melted by passage through an electrical arc and plasma spraying, in which the metal is melted by contact with a hot plasma.
- Patent 4,777,002 discloses a further process for making a mold by spraying steel onto a mold core which has first been coated with a water soluble separating layer; applying a backing to the sprayed layer of steel and then separating the backing and steel layer by dissolving the water soluble layer.
- Milovich et al. U.S. Patent 5,073,589 describes a backing resin for a sprayed metal tool to be used at temperatures up to about 750°C.
- the backing resin composition is placed on the rear surface of a metal shell.
- the metal shell is formed by spraying a matrix or pattern with metals such as tin, zinc, aluminum or steel alloys.
- a preferred method in accordance with this aspect of the invention includes the step of providing a matrix having a shape to be molded.
- the matrix may be formed from any convenient material, such as a readily machinable polymeric composition or a castable, multicomponent polymeric composition.
- Methods according to this aspect of the invention further include the step of depositing a metal on the matrix by spraying the metal in molten form from a spray gun while moving the spray gun relative to the matrix so that the spray gun passes back and forth over the matrix in a movement direction.
- the spray gun shifts in a step direction transverse to the movement direction between passes.
- the molten metal is ejected from the spray gun in a spray direction.
- the method includes the step of turning the gun between passes so as to change the spray direction.
- the motion of the spray gun relative to the matrix is controlled so that metal is deposited in overlapping regions during successive passes.
- metal is deposited in the same region of the matrix from two spray directions in a crisscross pattern.
- the deposited metal forms a shell on the matrix.
- the shell is removed from the matrix.
- Preferred processes according to this aspect of the present invention can form robust, thick metal shells of essentially any desired size which accurately reproduce the shape of the matrix. These shells can be used as molds for making a wide variety of articles.
- the process may include application of the sprayed metal in two or more stages, most preferably three stages.
- the sprayed metal is applied relatively slowly with relatively low power dissipation in the thermal spray gun and relatively low speed of motion of the spray gun over the matrix.
- the sprayed metal is applied at a higher rate, with high power dissipation in the spray gun and more rapid motion of the spray gun over the surface.
- the conditions used during the first stage provide for fine replication of the surface contours and formation of a dense metal layer adjacent the matrix without overheating the matrix.
- the conditions used in the second stage provide for rapid buildup of metal to form the thick, robust shell.
- the shell can be made into a "wickable” or "non-wickable” mold as desired.
- wickable means that the component has sufficient permeability to gases to dissipate volatiles evolved in a molding operation
- non-wickable means that the shell lacks this degree of gas permeability.
- the shells may be impregnated with polymeric materials or with metals such as nickel alloys which can be applied by electroless plating or by electroplating.
- the shells can be impregnated with polymeric materials such as the homopolymers and copolymers of monomers selected from the group consisting of tetrafluoroethylene,fluorinated ethylene propylene, perfluoroalkoxyethylene, acrylics, vinylidene fluorides and amides.
- polymeric materials such as the homopolymers and copolymers of monomers selected from the group consisting of tetrafluoroethylene,fluorinated ethylene propylene, perfluoroalkoxyethylene, acrylics, vinylidene fluorides and amides.
- a further aspect of the present invention provides metallic shells formed from spray deposited metals having combinations of properties not heretofore obtainable in spray deposited metal shells.
- Preferred shells according to this aspect of the invention include those having length and width dimensions of at least about 0.5 meters; having thickness of at least about 3mm and being formed from a spray deposited metal having a melting temperature of at least about 500 °C and more preferably at least about 1000
- Fig. 1 is a diagrammatic sectional view depicting a matrix and shell used in one embodiment of the invention.
- Fig. 2 is a diagram depicting spray gun motion and spray coverage in the embodiment of Fig. 1.
- a process in accordance with one embodiment of the invention utilizes a matrix 10 having a cavity region 12 depicting the shape of the part to be molded.
- Matrix 10 further includes edge regions 14 bounding cavity region 12 and side walls 16 projecting from edge regions 14 and cavity region 12. Side walls 16 have draft angles, most desirably about 3° -5° or more.
- edge regions 14 are about two inches (5 cm) wide or more.
- Matrix 10 desirably is formed from a material having useful structural strength up to about 220°F (104°C) or more.
- High temperature epoxy composite tooling compounds such as those sold under the designation EL-325HTTC epoxy composite tooling compounds by Adtech Corporation of Charlotte, Michigan can be employed.
- Such epoxies are provided commercially as two component systems which can be mixed and then cast to shape and cured. Alternatively, the mixture can be cast into a block and then machined to the desired shape.
- Other suitable materials are sold under the trademark REN SHAPE by the Ciba-Geigy Co ⁇ oration of Ardsley, New York and by Ren Plastics, Inc. of Lansing, Michigan.
- the REN SHAPE material commonly is provided as boards or prefabricated shapes which can be machined to the desired shape for the mold.
- Other readily formable or machinable materials including metals such as aluminum or brass or graphite may be employed.
- the desired shape for the cavity region may be provided as computer data and the matrix may be machined to shape using a conventional computer controlled machine tools.
- Polymeric materials such as the epoxy materials mentioned above can be reinforced with conventional fibrous reinforcements.
- Spray gun 22 is mounted on a conventional industrial robot 26 which is programmable using conventional techniques. Robot 26 is programmed to move the gun in the manner discussed below. Gun 22 is also connected to a source of the wire to be employed in the process (not shown) as well as a source of compressed gas, such as compressed air, for ejecting the droplets.
- the wire used by gun 22 has the same composition as the desired metallic shell.
- the metals which can be used are aluminum alloys such as those in the 2000; 3000; 5000; 6000 or 7000 series of aluminum alloys.
- ferrous metals including stainless steels can also be used.
- the stainless steel alloys which can be successfully employed are types 303, 304, 415, and 15.5.
- iron-nickel alloys are particularly useful to provide finished molds with very low thermal expansion coefficients.
- Alloys of iron and nickel having between about 30% and about 55% nickel, and between about 45% and about 70% iron are particularly preferred for this pu ⁇ ose.
- the most preferred alloys include alloys containing about 36% nickel.
- nickel 36 by the aforementioned Miller Thermal, Inc. and the material referred to as Invar 36.
- Nickel containing alloy of the type sold under the designation Nilo 36 Filler material, by INCO Alloys International of Huntington, West Virginia can also be employed.
- the Nilo filler material contains approximately about 36.29% nickel, 61.47% Fe; 1.14% Co; 0.26% Ti; 0.09% Si; 0.52% Mn and 0.23% C.
- the alloy referred to as Nilo 36 metal core, containing about 40.72% Ni and 58 % Fe, available from the aforementioned INCO Alloys International may also be employed.
- the 50% nickel - 50% Invar alloy may be employed.
- the surfaces of matrix 10 may be coated with a suitable sealant such as an epoxy hi-temperature surface coat available from the aforementioned AdTech Co ⁇ oration.
- robot 26 sweeps gun 22 over the surface of matrix 10 so that the gun moves in a movement direction indicated by double headed arrow 28 (Fig. 2) during each pass and shifts in a step direction 30 between passes.
- Robot 26 maintains the spray outlet of the gun at a preselected standoff distance from the surface of matrix 10.
- the robot also turns gun 22 so as to turn the spray direction relative to the movement direction in alternate passes.
- the gun is directed as indicated in solid lines at 22 in Fig. 2, and the spray direction is the first spray direction 24.
- the first-stage conditions produce a fine, dense metal coating on the matrix surface whereas the second stage conditions promote rapid buildup of deposited metal.
- particular spray conditions will vary somewhat with the particular spray gun used and also with the metal being deposited, the following conditions have been found satisfactory for deposition of 36% nickel - 64% iron alloys:
- Deposition under the second stage conditions is continued until almost all of the desired thickness has been built up.
- Shells of essentially any thickness can be made by continuing the deposition for the desired time.
- the thickness of the shell is built up to about at least 3mm, more preferably at least about 8 mm, and most preferably up to about 13 mm (1/2 inch) during the deposition process.
- the deposited metal shell is allowed to cool gradually, desirably over a period of at least several hours and more preferably over a longer time before being removed from the matrix. For example, cooling from about 150°C to about 20°C over a period of two to six weeks in a control-temperature environment, followed by several days additional cooling at room temperature is particularly preferred in the case of very large molds.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU77245/96A AU7724596A (en) | 1995-11-13 | 1996-11-13 | Fabrication of tooling by thermal spraying |
AT96940338T ATE242097T1 (en) | 1995-11-13 | 1996-11-13 | MAKING TOOLS BY THERMAL SPRAYING |
JP51894497A JP3707795B2 (en) | 1995-11-13 | 1996-11-13 | Tool forming by thermal spraying |
DE69628578T DE69628578T2 (en) | 1995-11-13 | 1996-11-13 | MANUFACTURING TOOLS THROUGH THERMAL SPRAYING |
CA002236821A CA2236821C (en) | 1995-11-13 | 1996-11-13 | Fabrication of tooling by thermal spraying |
EP96940338A EP0861145B1 (en) | 1995-11-13 | 1996-11-13 | Fabrication of tooling by thermal spraying |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US666695P | 1995-11-13 | 1995-11-13 | |
US60/006,666 | 1995-11-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997018074A1 true WO1997018074A1 (en) | 1997-05-22 |
WO1997018074A9 WO1997018074A9 (en) | 1997-11-27 |
Family
ID=21722017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/017932 WO1997018074A1 (en) | 1995-11-13 | 1996-11-13 | Fabrication of tooling by thermal spraying |
Country Status (7)
Country | Link |
---|---|
US (1) | US5817267A (en) |
EP (1) | EP0861145B1 (en) |
JP (2) | JP3707795B2 (en) |
AT (1) | ATE242097T1 (en) |
AU (1) | AU7724596A (en) |
DE (1) | DE69628578T2 (en) |
WO (1) | WO1997018074A1 (en) |
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- 1996-11-13 US US08/748,580 patent/US5817267A/en not_active Expired - Lifetime
- 1996-11-13 WO PCT/US1996/017932 patent/WO1997018074A1/en active IP Right Grant
- 1996-11-13 JP JP51894497A patent/JP3707795B2/en not_active Expired - Fee Related
- 1996-11-13 AT AT96940338T patent/ATE242097T1/en not_active IP Right Cessation
- 1996-11-13 DE DE69628578T patent/DE69628578T2/en not_active Expired - Lifetime
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0816038A3 (en) * | 1996-07-06 | 1999-06-09 | Ford Motor Company Limited | Method of manufacturing a moulding tool |
EP0816038A2 (en) * | 1996-07-06 | 1998-01-07 | Ford Motor Company Limited | Method of manufacturing a moulding tool |
WO1999047329A1 (en) * | 1998-03-16 | 1999-09-23 | Vantico Ag | Process for producing direct tooling mold and method for using the same |
US6355196B1 (en) | 1998-03-16 | 2002-03-12 | Vantico Inc. | Process for producing direct tooling mold and method for using the same |
EP0949350A3 (en) * | 1998-03-26 | 2003-11-05 | Ford Global Technologies, Inc. | Method of eliminating unevenness in pass-reversal thermal spraying |
EP0967295A1 (en) * | 1998-06-26 | 1999-12-29 | Sprayform Holdings Limited | Tooling production |
GB2338666B (en) * | 1998-06-26 | 2002-08-07 | Sprayform Holdings Ltd | Tooling production |
US6527038B1 (en) | 1998-06-26 | 2003-03-04 | Sprayform Holdings Limited | Tooling production |
EP1273675A2 (en) * | 2001-06-28 | 2003-01-08 | ALSTOM (Switzerland) Ltd | Method of manufacturing a spaced formed, foil shaped support layer of brittle material |
EP1273675A3 (en) * | 2001-06-28 | 2004-10-20 | ALSTOM Technology Ltd | Method of manufacturing a spaced formed, foil shaped support layer of brittle material |
US6895650B2 (en) | 2001-06-28 | 2005-05-24 | Alstom Technology Ltd | Process for producing a spatially shaped carrier layer |
WO2008067962A2 (en) * | 2006-12-05 | 2008-06-12 | Eads Deutschland Gmbh | Repairs and/or changes in contour of a form surface of a form tool |
WO2008067962A3 (en) * | 2006-12-05 | 2009-04-09 | Eads Deutschland Gmbh | Repairs and/or changes in contour of a form surface of a form tool |
EP3683027A1 (en) * | 2019-01-21 | 2020-07-22 | Airbus Operations, S.L.U. | Method for manufacturing tooling |
CN111452353A (en) * | 2019-01-21 | 2020-07-28 | 空中客车西班牙有限责任公司 | Method for producing a tool |
Also Published As
Publication number | Publication date |
---|---|
ATE242097T1 (en) | 2003-06-15 |
DE69628578T2 (en) | 2004-05-06 |
JP3707795B2 (en) | 2005-10-19 |
JP2000510394A (en) | 2000-08-15 |
EP0861145B1 (en) | 2003-06-04 |
EP0861145A4 (en) | 2001-01-24 |
AU7724596A (en) | 1997-06-05 |
EP0861145A1 (en) | 1998-09-02 |
JP2004276594A (en) | 2004-10-07 |
DE69628578D1 (en) | 2003-07-10 |
US5817267A (en) | 1998-10-06 |
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