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
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
  • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
  • B29C70/205—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres the structure being shaped to form a three-dimensional configuration
  • B29C70/207—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres the structure being shaped to form a three-dimensional configuration arranged in parallel planes of fibres crossing at substantial angles
• • 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
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
  • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
  • B29C70/202—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres arranged in parallel planes or structures of fibres crossing at substantial angles, e.g. cross-moulding compound [XMC]
• • 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
  • B29C70/34—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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
  • B29C70/342—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 and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
• • 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
  • B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
• • 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
  • B29D99/0003—Producing profiled members, e.g. beams
• • 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
  • B29L2031/001—Profiled members, e.g. beams, sections
  • B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
• • 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
• • 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
• • 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
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
• • 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
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49801—Shaping fiber or fibered material
• • 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.]
  • Y10T428/24058—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in respective layers or components in angular relation
  • Y10T428/24074—Strand or strand-portions
• • 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.]
  • Y10T428/24058—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in respective layers or components in angular relation
  • Y10T428/24074—Strand or strand-portions
  • Y10T428/24116—Oblique to direction of web
• • 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.]
  • Y10T428/24628—Nonplanar uniform thickness material

Definitions

• the present invention relates to a method for producing a profile of composite material having a configuration having at least a first portion having a non-zero radius of curvature, from at least one composite strip extending along a longitudinal axis.
• It also relates to a device implementing such a method, and a corresponding composite material profile. It finds a particularly important but non-exclusive application in the field of manufacturing curved parts of high strength, for example in the field of aeronautics for the manufacture of aircraft cabin frames. But it can also be used in other areas that require great resistance to efforts, such as recreational and competitive sports.
• the present invention aims to provide a method, a device and a profile that better than those previously known to the requirements of the practice, in particular in that it makes it possible to obtain a profile made of composite material whose lay-up of unidirectional prepreg plies is perfectly homogeneous, at a low cost, and this through the realization of a preliminary band, not yet deformed, but which will then, once extended by curving, increase the mechanical performance of the final product significantly.
• the invention essentially proposes a method for producing a composite material profile having a configuration having at least a first portion having a non-zero radius of curvature, from at least one composite strip extending the along a longitudinal axis, characterized in that, the strip being formed by the stack of at least two layers of unidirectional reinforcing fibers arranged in orientations different from that of the longitudinal axis of the strip and between them, the plies being pre-impregnated with resin and pre-compacted with each other at a determined pressure and temperature, the strip is draped over a jig having a planar or substantially flat application face of generally elongate shape, of determined configuration corresponding to that of the desired profile and extending around a reference line, progressively applying the band and simultaneously deforming it along said reference line, so that one carries out on the part or parts having a radius of curvature not zero progressive blooming of the fibers in the plan of application.
• This progressive expansion corresponds to an enlargement of the space separating two fibers of the same ply, in the transverse direction of the strip, the progressive deformation of the angular opening existing between two fibers being carried out homogeneously. and regular on the part having a non-zero radius of curvature of the strip.
• reference line is meant the general line followed by the longitudinal axis around which the template extends and therefore the corresponding profile in the plane.
• the profile comprises at least a second portion having a non-zero radius of curvature; the first and second parts have different radii of curvature; the strip being wound on an unwinding roll, the strip is draped by unrolling said roll on the template while guiding it during its longitudinal displacement by guiding means with the same reference line as the template; a strip is draped in which the unidirectional fibers of at least two of the plies are symmetrical with respect to the axis of the strip;
• the composite strip is formed from three superposed sheets and agglomerated by compacting one to the other; the parallel fibers of each of the plies form an angle with the axis of the band respectively of value: 90-a °, 90 °, 90 ° + a °; the respective angles are 90 ° -a and / or 90 ° -b and / or 90 ° + a and / or 90 ° + b;
• - a and / or b is such that: 10 ° ⁇ a ⁇ 80 °; the fibers are made of carbon and the resin an epoxy resin; the template has a cavity, to then form a profile of complementary shape, after punching of the band in the cavity, and before solidification;
• the jig is in the form of a beam of rectangular or trapezoidal section, to form a profile in the form of a U-shaped beam after folding the edges of the strip on the lateral faces of the jig, and before solidification; at least two successive layers of said composite strips are produced; is superimposed and / or intercalated between two layers, in the longitudinal direction, at least one reinforcement ply of complementary unidirectional composite material whose reinforcing fibers are parallel to the axis.
• the invention also proposes a device implementing the method as described above.
• the profile has at least a second portion having a non-zero radius of curvature.
• the first and second parts have different radii of curvature.
• the support comprises at least one unwinding roll and the guide means comprise two rails, flanges or guide grooves disposed on either side of the template, of the same reference line as the template.
• the device further comprises means for forming the composite strip comprising means for progressively applying said layers to one another, giving the parallel fibers of each of said layers a different orientation by relative to the radius (s) of curvature of the profile to be obtained and means of compaction with each other to ensure cohesion at a given pressure and temperature.
• the pressure is between 0.5 and 5 bars absolute and the temperature is between 15 ° C. and 80 ° C., for example 0.9 bar and 40 ° C.
• the means for forming the composite strip comprise more means for superposition of a third layer and progressive application of said third layer to agglomerate it by compacting with the others, the parallel fibers of each of said plies for example forming an angle with the axis of the band respectively of value: 90 ° -a °, 90 °, 90 ° + a °.
• the template is in the form of a cavity, and the device comprises means for punching the strip in the cavity to then form a complementary shape profile before solidification.
• the template is in the form of a rectangular or trapezoidal section beam, and the device comprises means for folding the edges of the strip on the lateral faces of the template to form a U-shaped beam profile before solidification.
• the invention also provides a profile obtained with the method described above.
• a composite material profile having a configuration having a first portion having a non-zero radius of curvature, comprising at least one composite strip extending along a longitudinal axis, characterized in that the strip is formed by the stacking of at least two plies of unidirectional reinforcing fibers arranged in orientations different from that of the longitudinal axis of the strip and between them, the plies being pre-impregnated with resin and pre-compacted with each other at a determined pressure and temperature, the band being deformed according to said configuration, and having a progressive development of the fibers in the application plane by regular deformation of angular aperture obtained over the width of the strip.
• the profile has at least a second portion having a non-zero radius of curvature.
• the unidirectional fibers of two of the plies are symmetrical with respect to the axis of the strip for example with angles with respect to the axis of the strip of 90 ° -a and 90 ° + a, with a between 0 And 80 °, preferably 45 ° or 60 °.
• the invention also relates to an aircraft cabin part obtained from a profile made according to the method as described above.
• the invention will be better understood on reading the embodiments described below by way of non-limiting examples.
• Figure 1 shows composite strips formed of one, two or three plies of parallel reinforcement fibers pre-impregnated with resin in an orientation d and usable according to the invention.
• Figure 2 is a top view in perspective showing the placement of webs as described with reference to Figure 1, superimposed, before compacting to ensure cohesion.
• FIG. 3 shows the cutting of strips obtained from the windings of FIG. 2, usable according to the invention.
• FIGS. 4A and 4B show, in plan view, curved strips obtained with two or three sheets superposed corresponding to the plies shown in FIG.
• FIG. 4C illustrates in plan view, the progressive unfolding of fibers (here perpendicular to the longitudinal axis) by regular and increasing deformation of the angular aperture obtained over the length of the strip, as obtained with the invention.
• Figure 5 is a partial perspective view of an embodiment of a device implementing the method according to the invention.
• FIG. 6 shows the result before coating of a strip obtained with the device of FIG.
• Figures 7 and 8 show the following steps of obtaining the profile according to one embodiment of the invention, by emptying a space between a sheet or sheet of draping and the curved strip obtained with the invention.
• Figure 9 is a partial perspective view in section, after reversal and insertion of the profile in a mold for solidification of the profile in a manner known in itself by pressurizing and vacuum cooking.
• Figures 10 and 11 show in perspective embodiments of profile or contoured section portion obtained with the invention.
• FIG. 12 and 13 show in perspective another embodiment of a profile device according to the invention, wherein the U or C profile is obtained by punching the curved pre-stretched strip.
• FIG. 1 schematically shows three rectangular plies 1, 2, 3 made of reinforcing fibers 4, 5, 6 arranged in orientations different from those of the longitudinal axis 7, 8, 9 of the ply concerned.
• Each of these plies is pre-impregnated with resin, for example of the epoxy type, and will make it possible to construct a band that can be used according to the invention.
• thermoset or thermoplastic resin any type of thermoset or thermoplastic resin is of course usable.
• strip 10 are formed by the stacking of two layers (strip 10) or three layers (strip 11). More specifically, the strip 10 is formed by the stacking of the plies 2 and 3 whose unidirectional fibers form with their respective axis as shown in the figure, an angle of 15 °, which gives a lattice structure 12 (or nest of bee).
• the band 11 is obtained by the superposition of three layers, namely a superposition of the layers 1, 2 and 3 giving a structure 13 denser. More precisely, each of the strips 10 and 11 is thus formed by stacking the corresponding sheets of unidirectional reinforcing thread, which are therefore arranged in orientations different from those of the longitudinal axis of the band concerned, said sheets being pre-impregnated of resin and pre-compacted with each other at a predetermined pressure and temperature. These will depend on both the resin used, the fibers used and the strength and strength of the desired profile after solidification.
• the compaction pressure may for example be of the order of 0.8 bar absolute, for example obtained by evacuation and plating of the plies one on the other in a corresponding chamber, but may also be obtained by pressure external in a press, or through a pressure roller at pressures up to 3, 4 or even 5 bar.
• the determined temperature used for this multi-tableclack preparation is advantageously the ambient temperature which allows a good flexibility of the materials without fast solidification of the resins. But a cooler and / or higher temperature for practical reasons within the reach of the skilled person, is also possible.
• FIG. 2 shows a means for producing a band used with the method according to the invention.
• the strip is draped over a template as will be described hereinafter. after referring to Figures 5 or 12.
• FIGS. 4A and 4B show the deformed strips 22 and 23 obtained according to the invention, the curved parts of the profile having progressive blooming of the fibers, as represented by way of illustration in FIG. 4C applied to a single ply 1 whose fibers are perpendicular to the axis 7 of the web in the application plane.
• the angle between two fibers, in particular adjacent ones, is conserved or substantially preserved, on the width of the strip, taking into account the blooming carried out in a regular manner as described above. If the curved part of the strip always has an identical radius of curvature (case of a circle) the distortion of the distances along the same line parallel to the reference line will be identical between two fibers initially separated, before curvature, of the same width.
• the deformation will then be variable in a mathematically homogeneous manner as a function of the variations of said radius of curvature on the corresponding parts.
• FIG. 5 shows a device 30 according to a first embodiment of the invention, arranged to produce a U-shaped composite material profile having a curved shape with a non-zero radius of curvature, from a composite strip, for example the strip 11 formed of three superimposed 1,2,3 prepreg plies, which extends along its longitudinal axis 15 to obtain the curved strip 23.
• the device 30 comprises a support 31 of composite strip provided with a cylinder 32 , unwinder, on which was wound the strip 11 and perpendicular axis 33 to the longitudinal axis 15 of said strip. Motor means (not shown) allow the smooth running of this cylinder.
• the device 30 comprises a template 34 formed of a curved parallelepipedic block 35 of complementary shape to the inner part of the U-shaped profile that one wishes to produce, said template having an application face 36, flat or substantially flat, of elongated general shape of determined configuration corresponding to that of the profile to be obtained.
• the device 30 further comprises means 37 for progressive draping of the strip on the template. These means comprise means 38 for gripping the support, for example constituted by an axis 39 supported on either side of the cylinder by two symmetrical, movable gantries 40, whose posts 41 comprise feet mounted on wheels 42 arranged to follow the curvature means 43 for guiding the support, which will be described below.
• the draping means 37 also comprise motor means, which may be identical to those mentioned above, allowing the roller to move along the template, and means 44 for pressurizing the sheet by the support on the face of the sheet.
• application 36 for example formed of a system with vertical springs to compensate for the gradual loss of thickness of the roll following the deposition of the strip on said face of the support.
• the pressurizing means may also be a device allowing easy sliding of the horizontal portion of the frames 40, for example formed of soft friction rings on integral and parallel axes located along the poles
• the means 43 for guiding the support to generate the draping of the strip comprise two rails and / or guide edges 45 adapted to cooperate with the wheels
• the rails therefore have the same radii of curvature (fixed or variable) as the radius of curvature of the profile to be produced.
• FIG. 6 shows the first phase of embodiment of the embodiment of the profile more particularly described here, the draping means having been removed after production thereof.
• the strip 23 thus produced rests on the upper face 36 of the template 34, the edges 50 of the strip protruding laterally from this face, and will be brought to come down on the lateral faces 51 of the template.
• the template and the guide means are based on a table 52 provided on its periphery 53 sealing means.
• the device for configuring the desired definitive profile, in U, from the intermediate profile 23 above is more specifically described with reference to FIGS. 7 and 8.
• FIG. 7 shows in perspective the strip 23 which rests on the template 34, itself integral with the table 52 whose edges 53 comprise grooves 54 provided with joints 55, which will make it possible to ensure a good watertightness of the fabric or waterproof tarpaulin 56,
• FIG. 8 more particularly shows the plating of the lateral edges 50 of the profile by means of the vacuum drawing of the volume existing between the surface of the table 57 and the fabric 56.
• a vacuum pump 58 connected to the surface of the table 59 is sucked so that little by little the fabric 56 comes to press the edges 50 of the profile on the template. Once the profile in its final formal configuration, it is then polymerized under pressure at high temperature in a known manner in itself.
• the profile is placed on a hollow template in a metal counter-mold having a silicone sheet, which is pressurized.
• the part is switched to trimming and ultrasonic testing, to obtain the final profile 63 (see Figure 10) which will, for example, be used for the frame of a cabin aircraft.
• FIG. 9 shows another embodiment envisaged to complete the fabrication of the definitive profile.
• the not yet solidified profile 60 is introduced into the counter mold 61 of complementary shape.
• a silicone core 62 is then placed in the profile, also of complementary shape to the desired profile, for example wood and then pressurized, for example by evacuating or by inflation of the core. Then the block 62 is removed (or not) before cooking under vacuum and under pressure as described above.
• Such reinforcing means are determined as a function of the stresses and resistances sought in the context of the use of the profile concerned and are deposited so as to be within the abilities of those skilled in the art, by lateral unwinding of ribbons for example from unidirectional coil of steering fiber parallel or not parallel to the reference line, adequate width, automatically or semi-automatically, the tapes being for example compressed by axis rollers vertical in the case of a deposit on the lateral edges of the U.
• FIG. 12 and 13 show (partially) another embodiment of a device 70 according to the invention. It comprises means 71 for draping the band 72 of the type described with reference to FIG. 5, but this time on a female mold 73 provided with a recess 74 corresponding to the configuration of the desired profile, the template being in fact in the form of a cavity.
• the device furthermore comprises (see FIG. 13) punching means 75 comprising a core 76, for example of semi-rigid material, of non-deformable section, or other, of a shape complementary to that of the recess 74, which when it will be applied on the band 72 will allow to obtain by punching the configuration of the U-shaped template before solidification.
• punching means 75 comprising a core 76, for example of semi-rigid material, of non-deformable section, or other, of a shape complementary to that of the recess 74, which when it will be applied on the band 72 will allow to obtain by punching the configuration of the U-shaped template before solidification.
• the orientations of the fibers are for example minus 45 °, (or minus 30 °), 90 °, (plus 30 ° or) plus 45 °.
• the operation can be made from rolls comprising unidirectional sheets pre-impregnated semi-automated or automated. Pre-compaction before cutting strips to ensure cohesion and cutting to the desired widths, for example 150mm, is then performed (see Figure 3). The band 21 thus obtained is for example wound on the roll 32.
• the principle is to achieve balanced progressive blooming without dissociation of the fibers with each other, which makes it possible to obtain performances, especially in resistance, which are particularly important on templates which, traditionally, being curved, required complex assemblies.
• the roll 11 is then put in place on the unwinding device (support means and motors) of the strip.
• the unwinding system is in turn guided by the inner and outer guide rails 45, for example circular if the desired profile is in an arc.
• the draping is then carried out progressively on the template for example wood or silicone of higher or lower hardness.
• the angular opening deformation of the multiaxial strip is then homogeneous, the unwinding taking place automatically or semi-automatically at a slow speed, for example 1 m per minute.
• a strip of the type shown in FIG. 4B is thus obtained with excellent expansion, which rests on the jig 34 (see FIG. 7).
• the frame 56 'provided with its expandable silicone sheet 56 is then placed in place to flatten the returns, ie the blanks 50 of the C or U profile on the template 34. With reference to FIG. creates the vacuum between the silicone cover 56 and the surface 57 of the table, which actually comes to press the edges 50 along the jig 34.
• the resulting profile which is a semi-product is then solidified. To do this, it is placed in a mold provided with a cavity of complementary shape, (see FIG. 9), then a silicone core 62 is inserted into the product before putting all the pressure in order to press the profile against the walls. said mold pressurizing it, and then cooking under pressure or under vacuum in a manner known per se.
• the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants and in particular those in which the shape of the template, and therefore of the profile obtained, comprises several different radii of curvature, including in opposite directions.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Textile Engineering (AREA)
• Moulding By Coating Moulds (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

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• 2008
  • 2008-03-07 FR FR0801261A patent/FR2928294B1/fr not_active Expired - Fee Related
• 2009
  • 2009-03-05 CN CN200980113385.XA patent/CN102006986B/zh active Active
  • 2009-03-05 US US12/920,922 patent/US20110086199A1/en not_active Abandoned
  • 2009-03-05 EP EP09722505A patent/EP2262634A2/fr not_active Withdrawn
  • 2009-03-05 WO PCT/FR2009/050357 patent/WO2009115734A2/fr active Application Filing

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