Classifications

• • 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
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
  • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
  • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C45/1671—Making multilayered or multicoloured articles with an insert
• • 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
  • B29C70/06—Fibrous reinforcements only
  • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
  • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
• • 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
  • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
  • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
• • 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
  • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
  • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
  • B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
• • 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
  • B29D99/0021—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings provided with plain or filled structures, e.g. cores, placed between two or more plates or sheets, e.g. in a matrix
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
  • B64D29/00—Power-plant nacelles, fairings, or cowlings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02K—JET-PROPULSION PLANTS
  • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/64—Reversing fan flow
  • F02K1/70—Reversing fan flow using thrust reverser flaps or doors mounted on the fan housing
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
  • B29C2045/1659—Fusion bonds
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C2045/1692—Making multilayered or multicoloured articles one layer comprising fibres
• • 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
  • B29L2007/00—Flat articles, e.g. films or sheets
  • B29L2007/002—Panels; Plates; Sheets
• • 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
  • B29L2009/00—Layered products
• • 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
  • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

• the present patent application relates to the manufacture of cellular panels, intended in particular in the field of aeronautics.
• cellular panel is meant a panel formed of a cellular structure enclosed between two rigid skins.
• the cellular structure is an aerated structure, that is to say formed of cells juxtaposed to each other.
• Such a cellular structure may be formed for example by polyethylene foam, or by a honeycomb structure, formed of a juxtaposition of cells.
• Such cell panels have the advantage that they are very good in the field, making them particularly suitable for aeronautical applications.
• Such thrust reversal flaps actuated by thrust reversing rods when it is desired to redirect towards the front of the aircraft a portion of the air flow generated by the turbojet engines, must be able to withstand very strong forces. air pressures.
• reinforcements are fixed on the cellular panels which form these inversion flaps.
• FIG. 1 a first embodiment of such a thrust reversal shutter of the prior art.
• This component comprises in this case a honeycomb structure 1 enclosed within a structuring skin 3 and an acoustic skin 5 pierced with a multitude of holes.
• This thrust reversal flap can thus absorb some of the noise caused by the very high velocity air flow in the air stream in which this flap is installed.
• Structural and acoustic skins 5 are typically made of composite materials, such as pleats of glass fiber and / or carbon fabrics taken from polymerized resin.
• An angle 7, formed of metal alloy or composite material, is attached to the outside of the structuring skin 3, by gluing and / or riveting.
• the angle 7 is attached to the inside of the structuring skin 3, also by gluing and / or riveting.
• the angle 7 clutter the outer casing of the thrust reversal flap, and it is likely to detach in case of external shock.
• angle 7 when the angle 7 is made of composite material, it must be prefabricated before being installed on the thrust reversal flap, so that several firing cycles must be considered to form the entirety of the room.
• This object of the invention is achieved with a method of manufacturing a cellular panel comprising a cellular structure sandwiched between first and second rigid skins, characterized in that it comprises the steps of:
• the reinforcement of the cellular panel is obtained by adding folds of tissue in the space separating the blocks of cellular material, then by firing in a single operation of the set of blocks of cellular material wrapped in the folds of tissue.
• a reinforced cellular panel is obtained that does not require the supply of external parts, in which the reinforcement elements are incorporated, and can be fired in a single operation: it is in a way a structure of " box ", both very strong, having no protruding elements, and particularly simple to manufacture.
• the base ply is pierced after baking so as to obtain an acoustic absorption panel
• said reinforcing ply is formed by an over-length of at least one end of said base ply;
• reinforcement is formed by over-lengths of two ends of said base fold
• said reinforcing ply is formed by a fold distinct from said base ply;
• said reinforcement fold is formed of dry fabric
• said reinforcing ply is formed of fresh fabric
• a resin injection method is used by infusion.
• the present invention also relates to a cellular panel obtained by a method according to the above, and to a nacelle for an aircraft turbojet equipped with at least one cellular panel according to the above.
• FIGS. 1 and 2 are perspective views of two variants of reinforced cellular panels of the prior art, described in the preamble of the present description,
• FIGS. 3 and 4 are perspective views respectively of the extrados and the intrados of a thrust reverser flap made with the method according to the present invention
• FIGS. 5 to 7 are diagrammatic sectional views of the different steps of manufacturing a panel according to a first embodiment of the method according to the invention.
• FIG. 8 is a sectional view of a cellular panel made according to a second embodiment of the method according to the invention.
• This thrust reversal flap 9 has a generally slightly trapezoidal trapezoidal plate shape, comprising an upper surface 11 and a lower surface 13.
• the lower surface 13 is the face of the flap 9 which is intended to be in contact with the cold air flow generated by the turbojet fan, both in direct jet mode and reverse jet.
• the intrados 13 forms the outer wall of the cold flow vein of the thrust reverser, and allows the flow of this cold air downstream of the turbojet engine, thereby providing the thrust necessary for the propulsion of the aircraft.
• the thrust reverser flap 9 hinders the cold flow vein, so that the intrados 13 redirects most of the cold air flow upstream of the thrust reverser, allowing contribute to the braking of the aircraft during landing. It is therefore understood that the intrados 1 3 is the "active" surface of the inversion flap 9, that is to say the surface to have satisfactory aerodynamic characteristics and / or sound absorption.
• the thrust reversal shutter 9 is made by means of the method according to the invention, and thus comprises internal reinforcing elements 17a, 17b, made according to the method according to the invention, as will be described below. .
• two blocks 19a, 19b of cellular material such as honeycomb structures, are initially placed on a fold of dry fabric 21, while maintaining a space 23 between these two blocks 19a and 19b.
• fold means a web of fiber fabric, such as carbon or glass fibers, intended to be impregnated with curable polymerizable resin.
• both ends 25a and 25b of this base ply 21 are folded so as to enclose the two blocks of cellular material 19a and 19b. .
• folds 27 may be dry folds, that is to say fibers without resin, or fresh folds, that is to say, pre-impregnated folds of resin.
• the face of the assembly thus formed is covered, by which the reinforcement folds 27, of at least one, and preferably of a plurality, have been introduced 29a , 29b of dry folds or so-called "cover" 29a, 29b.
• the resin injection process may for example be a resin transfer molding (RTM) type process known per se.
• RTM resin transfer molding
• This process consists in the fact of the establishment of folds in a sequence and an appropriate geometry, the set being subsequently cooked in a single step once this implementation is carried out.
• the number of base plies 21, reinforcement 27 and coverage 29a, 29b is not limited to the embodiments shown: the number of superimposed folds can indeed vary as a function of needs and mechanical characteristics sought.
• over-lengths 21 1 a, 21 1 b, and 212 a, 212 b of the base pleats 21 a and 21 b, respectively, of which the lengths are U-shaped, are used. in the space 23 separating the two blocks of cellular material 19a and 19b.
• the cell panel thus obtained can fulfill an acoustic absorption function, as is generally the case with the thrust reversing flaps, it is of course possible to pierce the base folds 21 or 21a, 21b, so that the cells of the cell material blocks 19a and 19b can communicate with the cold air for scrolling along the intrados 13 of the thrust reversal flap.
• each block of cellular material 19a, 19b may itself consist of a stack of honeycomb structure, so as to achieve optimal acoustic absorption (structure sound absorption SDOF or DDOF, for "simple degree of freedom", that is to say a simple degree of freedom or “double degree of freedom” that is to say a double degree of freedom, as is known in itself).
• structure sound absorption SDOF or DDOF for "simple degree of freedom", that is to say a simple degree of freedom or “double degree of freedom” that is to say a double degree of freedom, as is known in itself).
• the cellular panels produced by the method according to the invention could equip all other parts of a nacelle for an aircraft turbojet engine, and may or may not have sound absorption characteristics.
• the method according to the invention could also be used to manufacture cellular panels intended for other parts of an aircraft than the nacelles.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Manufacturing & Machinery (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Laminated Bodies (AREA)
• Moulding By Coating Moulds (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46826719

Family Applications (1)

Country Status (8)

Families Citing this family (7)

Family Cites Families (6)

• 2012
  • 2012-06-12 FR FR1255505A patent/FR2991625B1/fr not_active Expired - Fee Related
• 2013
  • 2013-06-11 RU RU2014151677A patent/RU2014151677A/ru unknown
  • 2013-06-11 EP EP13733386.0A patent/EP2858811A1/fr not_active Withdrawn
  • 2013-06-11 CN CN201380031096.1A patent/CN104379326B/zh not_active Expired - Fee Related
  • 2013-06-11 BR BR112014030971A patent/BR112014030971A2/pt not_active IP Right Cessation
  • 2013-06-11 CA CA2875489A patent/CA2875489A1/fr not_active Abandoned
  • 2013-06-11 WO PCT/FR2013/051346 patent/WO2013186476A1/fr active Application Filing
• 2014
  • 2014-12-11 US US14/566,987 patent/US20150090524A1/en not_active Abandoned

Non-Patent Citations (1)

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