US20050163965A1 - Molding process and apparatus for producing unified composite structures - Google Patents
Molding process and apparatus for producing unified composite structures Download PDFInfo
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- US20050163965A1 US20050163965A1 US11/087,884 US8788405A US2005163965A1 US 20050163965 A1 US20050163965 A1 US 20050163965A1 US 8788405 A US8788405 A US 8788405A US 2005163965 A1 US2005163965 A1 US 2005163965A1
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- composite
- panels
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- flexible
- portions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D24/00—Producing articles with hollow walls
- B29D24/002—Producing articles with hollow walls formed with structures, e.g. cores placed between two plates or sheets, e.g. partially filled
- B29D24/008—Producing articles with hollow walls formed with structures, e.g. cores placed between two plates or sheets, e.g. partially filled the structure having hollow ridges, ribs or cores
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- 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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
- B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
- B29C33/505—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
- B29C66/72141—Fibres of continuous length
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/81455—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/81457—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/304—In-plane lamination by juxtaposing or interleaving of plies, e.g. scarf joining
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/001—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings
- B29D99/0014—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings provided with ridges or ribs, e.g. joined ribs
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/124—Tongue and groove joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/124—Tongue and groove joints
- B29C66/1248—Interpenetrating groove joints
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
- B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
- B29C66/53462—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies joining substantially flat covers and substantially flat bottoms to open ends of container bodies
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2024/00—Articles with hollow walls
- B29L2024/006—Articles with hollow walls multi-channelled
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
- B29L2031/3082—Fuselages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
- B29L2031/3085—Wings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
Definitions
- This invention relates to molding processes and apparatus', and more particularly to a molding process and apparatus for producing large and complex structural components especially well suited for aircraft structural components through a single step molding process.
- the present invention is directed to a molding process in which two or more dry fiber material preforms are stitched together to form preform assemblies that represent an approximate shape of the final component.
- the stitched-together preform assemblies are then placed within a suitable tool that maintains the part loft.
- a plurality of inflatable bladders are then placed inside the preform assemblies to serve as internal vacuum bags. Inflating the bladders serves to urge the dry fiber material forms against interior surfaces of the tool.
- each dry material form comprises a portion of rib, and the two portions are urged into contact with one another as the bladders are inflated.
- the entire stitched-together assembly is then infused with resin.
- Various areas of the stitched-together preforms such as possibly ribbed elements of the assembly, are formed by balancing the force applied to the preform through bladder pressure.
- the stitched-together dry fiber preform assembly is fully infused with resin, it is then cured inside a suitable oven for a predetermined period of time to allow the resin infused into the stitch-together assembly to thoroughly cure.
- the stitched-together assembly forms a finished, unitary part.
- the bladders may then be extracted through small holes formed at various portions of the assembly such as holes within rib webs of the assembly if the assembly includes such webs.
- the resulting unitized structure thus forms a single piece structural assembly that is co-cured and reinforced with z-direction stitching. Accordingly, no subsequent manufacturing steps involving bonding of individual molded details or elements or mechanical fastening of individual molded panels together is required.
- the co-curing and the stitching of the independent dry fiber material forms together to create a single piece unit further eliminates local stress concentrations at the interfaces of independent component sections of the assembly and results in a more durable, light weight structure that is especially well suited for use in high-performance aircraft manufacturing applications.
- FIG. 1 is a simplified perspective view of a section of a part manufactured in accordance with the method of the present invention, wherein the part represents an exemplary stiffened box structure;
- FIG. 2 a illustrates the orientation of the bladders within one half of a molding tool, with the upper half of the molding tool and the upper panel section removed to better illustrate the bladders;
- FIGS. 2 b - 2 e illustrate the independent steps of molding the independent preform details or elements that form the overall assembly in a single molding step
- FIG. 2 f is a simplified illustration of the molding tool residing within an oven while being cured.
- structure 10 formed in accordance with a preferred method of the present invention.
- structure 10 forms a stiffened box structure, but it will be appreciated immediately that the method of the present invention is not limited to the manufacturer of just stiffened box structures or even just aircraft subassemblies.
- the method of the present invention can be used to form unified, composite structural assemblies that are suitable for use in a wide variety of applications and for forming a wide variety of structural components.
- the exemplary unified, composite assembly 10 can be seen to include skin portions 12 and 14 which are secured by stitching 16 and 18 , respectively, to rib sections 20 and 22 , respectively of a structural rib assembly 26 .
- Each rib section 20 is comprised of at least a pair of panel portions 20 a and 20 b which are stitched together by stitching 28 .
- rib section 22 includes portions 22 a and 22 b that are secured together by stitching 30 .
- Stitching 16 secures panel portions 20 a and 20 b to skin 12
- stitching 18 secures panel portions 22 a and 22 b to skin 14 .
- a particularly unique feature of the rib assembly 26 is the “tongue-in-groove” arrangement by which rib sections 20 and 22 are coupled together.
- section 22 includes sections 22 c and 22 d which receive an end portion 32 of panel 20 .
- Fillet inserts 36 are also typically inserted into the voids formed in between skin 12 and section 20 , and in between skin 14 and section 22 prior to stitching the skins 12 and 14 to their respective panel sections 20 and 22 .
- Stitching 16 , 18 , 28 and 30 preferably comprises a common thread material such as KevlarTM. It will be appreciated, however, that suitable thread material may be employed such as VectranTM.
- the exemplary part 10 shown in FIG. 1 will typically incorporate two or more rib structures 26 , thus producing a plurality of internal void sections, three of which, 38 , 40 and 42 are shown in FIG. 1 .
- the composite structural assembly 10 is not limited to the use of only two rib sections 26 , but may employ only a single rib 26 or possibly three or more ribs 26 .
- the length of the skins 12 and 14 are limited only by the dimensions of the tool that is used to form the structural assembly 10 , as will be described in greater detail momentarily.
- Each of the skins 12 and 14 , and the independent component parts of the rib 26 are formed from a dry fiber material form, typically warp knit fabric.
- the dry materials forms are typically not impregnated With resin to facilitate the stitching process by avoiding fiber breakage during needle penetration.
- the ribs 26 may be each formed such that they each include at least one opening 41 for allowing an inflatable bladder, which will be explained momentarily, to be removed after the molding process that forms the composite structure 10 is completed.
- the openings 41 could be formed in end walls of the part (i.e., surfaces of the part perpendicular to the ribs 26 ). The precise shape of the part being formed, and the number of internal voids it incorporates, will determine in part where the opening(s) 41 are most effectively placed.
- FIGS. 2 a - 2 f a description of the molding process used to form the unified composite structure 10 will be described.
- panel sections 12 and 14 are placed adjacent one another such that sections 20 and 20 are aligned longitudinally with one another. End portions 32 of each section 20 are placed between sections 22 c and 22 d of rib section 22 ( FIG. 2 b ).
- a plurality of deflated bladders 44 , 46 and 48 are placed in the void sections 38 , 40 and 42 respectively.
- the panel sections 12 and 14 are then placed within dies 50 and 52 of a suitable rigid molding tool 54 .
- FIG. 2 a shows the orientation of the bladders 44 , 46 and 48 within the lower die 52 .
- openings 55 enable open ends 44 a , 46 a , 48 a of the bladders 44 , 46 and 48 , respectively, to extend through a wall 53 of the die 52 so that the bladders can be inflated.
- Ends 44 a , 46 a and 48 a are sealed around the openings 55 via suitable adhesive or other structure which permits the ends 44 a , 46 a , 48 a to be removed from the tool 54 when the process is completed.
- the composite structure 10 can be seen to include lateral end panels 57 .
- the inflatable bladders 44 , 46 and 48 are inflated by creating a vacuum within the interior area of the mold tooling 54 . This allows the outside ambient pressure (1 atm) to backfill the bladders with air and fully inflate them.
- a pressurized air source could be used to inflate the bladders 44 , 46 , 48 , as indicated in phantom in FIG. 2 a . With either method, the pressure that the inflated bladders 44 , 46 , 48 apply to the surfaces of the skin panels 12 and 14 can be closely controlled to ensure that the panels 12 , 14 are held firmly against interior surfaces of the tool 54 .
- the bladders 44 , 46 and 48 may be formed from a variety of light weight, flexible materials, but in one preferred form comprise latex bladders.
- the bladders 44 , 46 and 48 are shaped such that when they are substantially or fully inflated they engage the intersurfaces of the skin panels 12 and 14 and the surfaces of sections 20 and 22 of each of the ribs 26 .
- the bladders 44 , 46 and 48 urge the flaps 22 c and 22 d of each section 30 of each rib 26 against the end portion 32 of each section 28 of each rib 26 such that the sections 22 c and 22 d are effectively clamped against opposing surfaces of the end portion 32 ′ of each rib 26 .
- the bladders 44 , 46 and 48 further serve to maintain the skins 12 and 14 pressed against interior surfaces of the die portions 50 and 52 of the tool 54 .
- the bladders are shown substantially fully inflated.
- the flap portions 22 c and 22 d are almost fully clamped over the end portions 32 of each section 20 , and the skins 12 and 14 are being held against interior surfaces of the tool dies 50 and 52 .
- resin is introduced at one or more suitable openings in the tool 54 from a resin source 56 such that the skin panels 12 and 14 are held tightly against the interior surfaces of the molding tool dies 50 and 52 while the flap sections 22 c and 22 d are held tightly over an associated end portion 32 .
- the tool 50 is placed in a suitable oven 58 and then cured for a predetermined period of time, as indicated in FIG. 2 f .
- the period of time may vary considerably, but in one preferred implementation of the present invention it comprises a time period of about three hours.
- the oven 58 need not be an autoclave, but instead may simply comprise an oven suitable to heat the resin infused panels 12 , 14 , 20 and 22 to a temperature of preferably between about 250 degrees F. (121 degrees C.)-350 degrees F. (176 degrees C.).
- the fully formed and cured composite structural assembly 10 is formed. Co-curing the skins 12 and 14 to their respective rib sections 20 and 22 , while simultaneously carrying sections 22 c and 22 d to the end portion 32 of rib section 20 , eliminates the need to assemble the two skins 12 and 14 to the rib 26 in a separate manufacturing step. Alternatively, it eliminates the need to assemble the rib sections 20 and 22 to one another in a separate, subsequent manufacturing step by bonding or by mechanical fasteners such as rivets. Accordingly, a single, unitary, composite structural member can be created in a single molding step.
- the process of the present invention described above significantly reduces the cost of manufacturing closed, stiffened box structures and other complexly shaped components that would ordinarily have been manufactured with first a molding step, and then a subsequent securing step to secure two or more of the component sections together.
- Co-curing all of the component sections of the unitary, composite structural assembly 10 further provides a stronger structural part by providing efficient, continuous load paths along the interfaces where two or more components have been molded to one another.
- Forming the assembly 10 in one step further serves to minimize stress concentrations at the interfaces where two or more independent sections are joined together by eliminating the need for drilling or otherwise forming one or more openings through which fastening elements such as rivets can be installed.
- the stitching used to form the assembly 10 further helps to provide damage arrestment and further to increase damage tolerance to the assembly.
- the high-strength stitched interfaces also form stronger joints than what would be possible with co-curing two or more independent panel sections.
- the process of the present invention further provides for uniform, smooth internal transitions, such as where the flap sections 22 c and 22 d are bonded to end portion 32 of rib section 20 .
- a particularly desirable feature of the present invention is how the rib sections 20 and 22 are automatically urged into contact with one another as the bladders 44 , 46 , 48 are inflated.
- the bladders 44 , 46 and 48 may then be removed through openings 55 after the bladders 44 , 46 and 48 are deflated and rotated in a circular motion to help break the surface tension between the bladders and the inner part surfaces.
- the bladders 44 , 46 and 48 are extremely thin-gauge material and relatively inexpensive components that can be discarded after one molding operation is performed. If a multi-cell bladder is employed, then removal will require urging one or more of the cells through one or more openings 41 in the ribs 26 , before removing the bladder from the tool 54 , such as through a single one of openings 55 .
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Abstract
A method of forming a unitary, composite structural member, and a member formed in accordance with the process. The process involves stitching a plurality of warp knit panel sections together to generally form a plurality of independent panel sections. The sections are placed within the dies of a molding tool such that a rib portion of each section aligns. Inflatable bladders are then slipped into voids formed in between the various panel sections of the assembly. The bladders are inflated to hold the panel sections in the shape of the final product and to hold the rib portions in contact with one another. Resin is then infused into the panels that make up the assembly. The assembly is then cured. When the panels are removed from the molding tool a unitary, complexly shaped, composite structural member is formed.
Description
- This application is a divisional of U.S. patent application Ser. No. 10/393,195 filed on Mar. 20, 2003, the disclosure of which is incorporated herein by reference.
- This invention relates to molding processes and apparatus', and more particularly to a molding process and apparatus for producing large and complex structural components especially well suited for aircraft structural components through a single step molding process.
- Due to the size and complexity of structural components such as aircraft wings, sections of aircraft fuselage, etc., the formation of such structures using composite materials in a single step molding procedure has historically not been possible. Until recently, a process capable of holding critical dimensional features within narrow tolerance ranges for large complex composite structures did not exist.
- In previous manufacturing operations, typically the complex part is broken down into multiple pieces of simple design that are subsequently assembled into a single large complex structure. The cost to manufacture the structure thus increases significantly through the additional manufacturing steps needed to fabricate separately and then assemble (i.e., often bond adhesively or mechanically attach) two or more independent component parts to form a single overall structure.
- The present invention is directed to a molding process in which two or more dry fiber material preforms are stitched together to form preform assemblies that represent an approximate shape of the final component. The stitched-together preform assemblies are then placed within a suitable tool that maintains the part loft. A plurality of inflatable bladders are then placed inside the preform assemblies to serve as internal vacuum bags. Inflating the bladders serves to urge the dry fiber material forms against interior surfaces of the tool. In one preferred embodiment each dry material form comprises a portion of rib, and the two portions are urged into contact with one another as the bladders are inflated.
- After inflating the bladders, the entire stitched-together assembly is then infused with resin. Various areas of the stitched-together preforms, such as possibly ribbed elements of the assembly, are formed by balancing the force applied to the preform through bladder pressure.
- Once the stitched-together dry fiber preform assembly is fully infused with resin, it is then cured inside a suitable oven for a predetermined period of time to allow the resin infused into the stitch-together assembly to thoroughly cure. When removed from the tool, the stitched-together assembly forms a finished, unitary part. The bladders may then be extracted through small holes formed at various portions of the assembly such as holes within rib webs of the assembly if the assembly includes such webs. The resulting unitized structure thus forms a single piece structural assembly that is co-cured and reinforced with z-direction stitching. Accordingly, no subsequent manufacturing steps involving bonding of individual molded details or elements or mechanical fastening of individual molded panels together is required. The co-curing and the stitching of the independent dry fiber material forms together to create a single piece unit further eliminates local stress concentrations at the interfaces of independent component sections of the assembly and results in a more durable, light weight structure that is especially well suited for use in high-performance aircraft manufacturing applications.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
- The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
-
FIG. 1 is a simplified perspective view of a section of a part manufactured in accordance with the method of the present invention, wherein the part represents an exemplary stiffened box structure; -
FIG. 2 a illustrates the orientation of the bladders within one half of a molding tool, with the upper half of the molding tool and the upper panel section removed to better illustrate the bladders; -
FIGS. 2 b-2 e illustrate the independent steps of molding the independent preform details or elements that form the overall assembly in a single molding step; and -
FIG. 2 f is a simplified illustration of the molding tool residing within an oven while being cured. - The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
- Referring to
FIG. 1 , there is shown astructure 10 formed in accordance with a preferred method of the present invention. In this example,structure 10 forms a stiffened box structure, but it will be appreciated immediately that the method of the present invention is not limited to the manufacturer of just stiffened box structures or even just aircraft subassemblies. The method of the present invention can be used to form unified, composite structural assemblies that are suitable for use in a wide variety of applications and for forming a wide variety of structural components. - With further reference to
FIG. 1 , the exemplary unified,composite assembly 10 can be seen to includeskin portions sections structural rib assembly 26. Eachrib section 20 is comprised of at least a pair ofpanel portions rib section 22 includesportions panel portions skin 12, while stitching 18 securespanel portions skin 14. - A particularly unique feature of the
rib assembly 26 is the “tongue-in-groove” arrangement by whichrib sections section 22 includessections end portion 32 ofpanel 20.Fillet inserts 36 are also typically inserted into the voids formed in betweenskin 12 andsection 20, and in betweenskin 14 andsection 22 prior to stitching theskins respective panel sections -
Stitching - It will also be appreciated that the
exemplary part 10 shown inFIG. 1 will typically incorporate two or morerib structures 26, thus producing a plurality of internal void sections, three of which, 38, 40 and 42 are shown inFIG. 1 . Of course, the morerib sections 26 that are included, the more voids that will be produced. However, the compositestructural assembly 10 is not limited to the use of only tworib sections 26, but may employ only asingle rib 26 or possibly three ormore ribs 26. Furthermore, the length of theskins structural assembly 10, as will be described in greater detail momentarily. - Each of the
skins rib 26 are formed from a dry fiber material form, typically warp knit fabric. As will be understood, the dry materials forms are typically not impregnated With resin to facilitate the stitching process by avoiding fiber breakage during needle penetration. - With further reference to
FIG. 1 , theribs 26 may be each formed such that they each include at least one opening 41 for allowing an inflatable bladder, which will be explained momentarily, to be removed after the molding process that forms thecomposite structure 10 is completed. Alternatively, theopenings 41 could be formed in end walls of the part (i.e., surfaces of the part perpendicular to the ribs 26). The precise shape of the part being formed, and the number of internal voids it incorporates, will determine in part where the opening(s) 41 are most effectively placed. - Referring now to
FIGS. 2 a-2 f, a description of the molding process used to form the unifiedcomposite structure 10 will be described. With reference toFIGS. 2 a and 2 b,panel sections sections End portions 32 of eachsection 20 are placed betweensections FIG. 2 b). A plurality of deflatedbladders void sections panel sections dies rigid molding tool 54. It will be appreciated, however, that the just-described steps could be reversed, meaning that theskin panels rib sections dies rib sections skin panels FIG. 2 a shows the orientation of thebladders lower die 52. In this example,openings 55 enableopen ends bladders wall 53 of the die 52 so that the bladders can be inflated. Ends 44 a, 46 a and 48 a are sealed around theopenings 55 via suitable adhesive or other structure which permits theends tool 54 when the process is completed. In this example, thecomposite structure 10 can be seen to includelateral end panels 57. - With further reference to
FIGS. 2 b-2 d, after theskin panels inflatable bladders mold tooling 54. This allows the outside ambient pressure (1 atm) to backfill the bladders with air and fully inflate them. Alternatively, a pressurized air source could be used to inflate thebladders FIG. 2 a. With either method, the pressure that theinflated bladders skin panels panels tool 54. - The
bladders bladders skin panels sections ribs 26. Thebladders flaps rib 26 against theend portion 32 of eachsection 28 of eachrib 26 such that thesections end portion 32′ of eachrib 26. Thebladders skins die portions tool 54. - Referring to
FIG. 2 d, the bladders are shown substantially fully inflated. Theflap portions end portions 32 of eachsection 20, and theskins - Referring to
FIG. 2 e, resin is introduced at one or more suitable openings in thetool 54 from aresin source 56 such that theskin panels flap sections end portion 32. After thevarious portions structural assembly 10 are fully infused with resin, thetool 50 is placed in asuitable oven 58 and then cured for a predetermined period of time, as indicated inFIG. 2 f. The period of time may vary considerably, but in one preferred implementation of the present invention it comprises a time period of about three hours. It will also be appreciated that theoven 58 need not be an autoclave, but instead may simply comprise an oven suitable to heat the resin infusedpanels - When the
assembly comprising panels structural assembly 10 is formed. Co-curing theskins respective rib sections sections end portion 32 ofrib section 20, eliminates the need to assemble the twoskins rib 26 in a separate manufacturing step. Alternatively, it eliminates the need to assemble therib sections - The process of the present invention described above significantly reduces the cost of manufacturing closed, stiffened box structures and other complexly shaped components that would ordinarily have been manufactured with first a molding step, and then a subsequent securing step to secure two or more of the component sections together. Co-curing all of the component sections of the unitary, composite
structural assembly 10 further provides a stronger structural part by providing efficient, continuous load paths along the interfaces where two or more components have been molded to one another. Forming theassembly 10 in one step further serves to minimize stress concentrations at the interfaces where two or more independent sections are joined together by eliminating the need for drilling or otherwise forming one or more openings through which fastening elements such as rivets can be installed. The stitching used to form theassembly 10 further helps to provide damage arrestment and further to increase damage tolerance to the assembly. The high-strength stitched interfaces also form stronger joints than what would be possible with co-curing two or more independent panel sections. The process of the present invention further provides for uniform, smooth internal transitions, such as where theflap sections portion 32 ofrib section 20. - A particularly desirable feature of the present invention is how the
rib sections bladders - After the
assembly 10 is cured, thebladders openings 55 after thebladders bladders more openings 41 in theribs 26, before removing the bladder from thetool 54, such as through a single one ofopenings 55. - The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Claims (19)
1. A unitary composite structure comprising:
a first composite panel having a first rib portion secured thereto;
a second composite panel secured to a second rib portion;
said first and second composite panels being simultaneously infused with a resin while placed within a molding tool, wherein said rib portions interengage, and then said composite panels are cured for a desired curing time, wherein upon completion of said curing said first and second composite panels form a unitary composite structure having a rib structure formed by said first and second rib portions linking said first and second composite panels together.
2. The structure of claim 1 , wherein at least one of said first and second composite panels are formed from a warp knit fabric.
3. The structure of claim 1 , wherein a plurality of inflatable bladders are placed within the tool and inflated prior to infusing the first and second composite panels with resin, to assist in holding portions of said first and second composite panels in contact with interior surfaces of said molding tool, and said rib portions in contact with one another.
4. The structure of claim 1 , wherein one of said rib portions comprise a pair of flaps adapted to receive therebetween an end portion of the other one of said rib portions.
5. The structure of claim 1 , wherein at least one of said composite panels comprises a plurality of subpanels stitched together.
6. The structure of claim 5 , wherein said first composite panel is stitched to an edge of said first rib portion.
7. A unitary, composite structure, comprising:
a first flexible panel having a first flexible rib portion secured thereto so as to be able to extend non-parallel to said first flexible panel;
a second flexible panel having a second flexible rib portion secured thereto so as to be able to extend non-parallel to said second flexible panel; and
wherein said rib portions interengage one another when at least one inflatable bladder is placed between said flexible panels and adjacent said rib portion, and said bladder is inflated; and
wherein said flexible panels and said interengaging rib portions become rigid to form said composite structure after being placed in a mold, infused with a resin, and then allowed to cure.
8. The structure of claim 7 , wherein said first flexible panel and said second flexible panels comprise composite panels.
9. The structure of claim 7 , wherein said first and second flexible rib portions each comprise composite rib portions.
10. The structure of claim 7 , wherein a plurality of inflatable bladders are placed between said first and second flexible panels.
11. The structure of claim 7 , wherein said flexible panels and said flexible rib portions form an elongated, hollow portion within said structure.
12. The structure of claim 7 , wherein one of said rib portions includes a hole for enabling said inflatable bladder to be removed after said structure is cured.
13. The structure of claim 7 , wherein said flexible panels and said flexible rib portions form an internal I-beam structure when said structure is viewed end-wise.
14. A composite structure comprising:
a pair of composite panels disposed generally parallel to one another;
a plurality of composite rib panels stitched to the composite panels to form support ribs;
wherein said support ribs are formed when a plurality of inflatable bladders are placed between said panels and inflated to urge said composite rib panels to engage to form said support ribs; and
wherein said structure is formed when said composite panels and said composite rib panels are placed within a mold, infused with a resin and then allowed to cure.
15. The structure of claim 14 , wherein said composite rib panels comprise a tongue-in-groove engagement arrangement.
16. The structure of claim 14 , wherein at least one of said composite rib panels includes a hole for enabling at least one of said inflatable bladders to be removed after said structure is formed.
17. The structure of claim 14 , wherein support ribs define a plurality of elongated voids within said structure running co-extensively with said composite panels.
18. The structure of claim 14 , wherein at least one of said composite rib panels includes a pair of flaps adapted to fold over onto and sandwich an end portion of a different, mating one of said composite rib panels, as one of said inflatable bladders is inflated.
19. The structure of claim 14 , wherein a plurality of internal voids are formed within said structure, and voids being defined in part by said composite rib panels.
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US8382037B2 (en) | 2004-04-06 | 2013-02-26 | The Boeing Company | Composite barrel sections for aircraft fuselages and other structures |
US20110073708A1 (en) * | 2004-04-06 | 2011-03-31 | The Boeing Company | Composite Barrel Sections for Aircraft Fuselages and Other Structures, and Methods and Systems for Manufacturing Such Barrel Sections |
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US10689086B2 (en) | 2004-09-23 | 2020-06-23 | The Boeing Company | Splice joints for composite aircraft fuselages and other structures |
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US8303758B2 (en) | 2004-11-24 | 2012-11-06 | The Boeing Company | Methods for manufacturing composite sections for aircraft fuselages and other structures |
US8418740B2 (en) | 2004-11-24 | 2013-04-16 | The Boeing Company | Composite sections for aircraft fuselages and other structures, and methods and systems for manufacturing such sections |
US8168023B2 (en) | 2004-11-24 | 2012-05-01 | The Boeing Company | Composite sections for aircraft fuselages and other structures, and methods and systems for manufacturing such sections |
US8388795B2 (en) | 2007-05-17 | 2013-03-05 | The Boeing Company | Nanotube-enhanced interlayers for composite structures |
US8657990B2 (en) | 2007-05-17 | 2014-02-25 | The Boeing Company | Nanotube-enhanced interlayers for composite structures |
US8042767B2 (en) | 2007-09-04 | 2011-10-25 | The Boeing Company | Composite fabric with rigid member structure |
US20110039057A1 (en) * | 2009-08-17 | 2011-02-17 | The Boeing Company | Laminated composite rod and fabrication method |
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Also Published As
Publication number | Publication date |
---|---|
BRPI0400730A (en) | 2005-01-11 |
US6896841B2 (en) | 2005-05-24 |
CA2461440C (en) | 2010-06-01 |
CA2461440A1 (en) | 2004-09-20 |
US20040183227A1 (en) | 2004-09-23 |
EP1459873A3 (en) | 2007-09-05 |
DE602004027568D1 (en) | 2010-07-22 |
EP1459873A2 (en) | 2004-09-22 |
EP1459873B1 (en) | 2010-06-09 |
ATE470559T1 (en) | 2010-06-15 |
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