• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This woven-shaped preform has an omega section comprising a core (4) and a sole (2). At least a portion of the web (4) and at least a portion of the web (2) comprise common weft threads (26, 28, 30).
    公开号:FR3018286A1
    申请号:FR1451946
    申请日:2014-03-10
    公开日:2015-09-11
    发明作者:Julien Lorrillard；Bertrand Desjoyeaux；Michel Rognant；Benjamin Provost
    申请人:Aircelle SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a woven dry preform for producing an omega section reinforcement by resin impregnation, a stiffener obtained with such a preform, and a weaving system provided for producing such a preform.
    [0002] In order to produce resistant and light structural elements, in particular for the aeronautical field, it is known to prepare a dry fabric preform comprising, for example, carbon fibers, which is impregnated with a resin, in particular by a method of injection called "RTM" (Resin Transfer Molding).
    [0003] Thus, after curing to polymerize the resin, an element comprising fibers whose density and orientation are adjusted locally, in order to obtain strength characteristics adapted to the forces applied to this part. In particular, it is possible by means of this technique to produce skin-shaped pieces bent around an axis such as axisymmetric shells and comprising at least one circumferential stiffener giving rigidity to this skin: such a skin can be used especially in the manufacture of an aircraft engine nacelle. In some cases, the stiffening function is provided by an element having a constant cross-section substantially forming an omega ("û"), comprising a core (the round portion of the omega) and a sole (the extended base of the omega section). For the realization of the assembly formed by the curved skin to stiffen and the omega stiffener, it is known to separately make the skin and the stiffener which are pre-cooked, then assembled by a mechanical connection or gluing. It is also known to make only one of these elements by pre-cooking, then to set up the dry preform of the second element on this first element to achieve its impregnation and cooking, which assembles them at the same time.
    [0004] Finally, it is known to produce two distinct preforms, with simultaneous impregnation and firing of these two preforms placed in position relative to one another. However, these solutions do not ensure a strong bond between the core and the omega stiffener sole, since no fiber participates in these connections. There is then a reduced mechanical strength, with a risk of peeling by peeling in case of traction on the web or on the sole of the stiffener. Alternatively, the stiffener can be incorporated in the skin to be stiffened by manual draping of flat fabrics. However, this operation requires a large labor force, which entails costs. In addition, many fabric coupons are needed, and the orientation of the fibers is not optimized. The present invention is intended to avoid these disadvantages of the prior art. The object of the present invention is to provide a textile preform 15 particularly suited to the omega stiffener profile and the curved shape of the skin to be stiffened. It proposes for this purpose a preform woven by weaving, having an omega section comprising a core and a sole, remarkable in that at least a portion of said core and at least a portion 20 of said sole comprise son of common frame. The preform according to the invention thus comprises an intimate connection between the core and the sole of the stiffener. This woven connection makes it possible to counter the peeling effects which tend to separate the web from the sole of the stiffener. The inside of the omega stiffener (volume between the web and the sole) may be hollow or solid. An advantage of this woven preform is that in a single operation which can be easily industrialized and fast, a continuous weaving of the core and the sole of the preform is obtained, which are then shaped on tooling to the geometry of the preform. the final piece including the retaining device in the form of the core of the stiffener (core or counterform tool and bladder, foam shape, etc ...), then impregnated with resin, to constitute after cooking a very homogeneous assembly including at least a portion of the weft son ensures a strong connection between the soul and the sole of the stiffener. Another advantage of such a preform is that the joint-shaped weave of all the surfaces predisposes the preform to fit the shape for which it was designed by mastering the relative fiber orientations. The woven preform according to the invention may furthermore comprise one or more of the following characteristics, which may be combined with one another: the sole plies bind the chains of the lateral parts of the sole to the chains of the central part of the soleplate and the webs of the soul bind said chains of the lateral parts of the sole to the chains of the central part of the soul; some frames of the sole bind a web of strings from the side portions of the sole to the strings of the central part of the core, and other wefts link another web of strings from the central parts of the sole to the strings of the central part of the soul; some frames of the sole bind at least one web of chains from the side portions of the sole to at least one web of strings of the center portions of the sole, and other wefts bind each of said chain plies of the sole to the chains; from the central part of the soul; said core comprises a superposition of fabrics whose webs of chains are at least partially linked together; said sole comprises a superposition of fabrics whose webs of chains are at least partially linked together; said core comprises a superposition of tissues which are attached to one another by interlocking of correspondingly shaped tissues; said sole is formed of two parts separated from each other; - said two parts overlap partially; Said two parts are separated from each other so as to define a slot; said soul is in the concavity of said preform; said core is on the convex part of said preform; - The weft son of said core form an angle different from 90 ° with at least a portion of the warp son of said soul; said sole or said core, or both, further comprises a superposition of fabrics attached to one another by draping; at least some of the fabric elements and the preform are connected by seams; - Different parts of preforms and additional pleats can be sewn between them to strengthen their cohesion. The present invention also relates to a stiffener, remarkable in that it is obtained by resin impregnation, and then baking a preform according to the above. The present invention also relates to a method of manufacturing a preform according to the above, remarkable in that this preform is made by weaving contour on a winding mandrel having a groove or an outgrowth (depending on the face concave or convex of the ferrule on which the stiffener is based), with a specific independent element for weaving in the form of the soul and sole of the preform. According to other optional features of this method: the sides of said preform are tightened in order to reduce the width of this substantially cylindrical woven preform, while increasing the winding diameter of said core and said sole; said sole is cut off at the output of the loom to form said central slot; Said sole is made by at least two additional side-chain plies separated from the weft threads of the core of the preform, and then these side portions are unfolded towards the center of the preform. The present invention also relates to an axisymmetric shape, in particular for an aircraft nacelle, which is remarkable in that it is reinforced by at least one stiffener in accordance with the foregoing.
    [0005] The invention will be better understood and other features and advantages will appear more clearly on reading the following description given by way of example, with reference to the appended drawings in which: FIGS. 1a and 1b are views of FIG. assembly and detail of a stiffener 5 obtained with a woven preform according to the invention; FIGS. 2a and 2b are diagrams of organization of the yarns of a first weaving mode of this preform, comprising at the exit of this weave a sole formed integrally, FIG. 2a showing in perspective the distribution of plies of yarns, and FIG. 2b having in section an interlacing arrangement of yarns perpendicular to one another; - Figure 3 shows a perspective view of the preform wound on an axisymmetric shape characteristic of weaving shaped; - Figure 4 shows the cutting of the sole in two parts; FIGS. 5a, 5b and 6a, 6b show a process for creating the shape of the preform associated with weaving, comprising respectively the side views of the assembly, and the views of the shaping mandrel for facing stiffeners; concave or convex face of axisymmetric surface; - Figure 7 is a sectional diagram of the weave of the preform, according to a variant of the first embodiment; Figure 8 shows in perspective a second mode of weaving of the preform; FIGS. 8a to 8c and 8d to 8f show successive steps of shaping this preform; Figure 9a is a sectional diagram of weaving of the preform according to a variant of the second embodiment; - Figures 9b and 9c show in cross section two successive stages of subsequent shaping of the weaving of this variant; FIG. 10a and 10b show a sectional diagram of weaving of the preform, according to another variant of the second embodiment and its deployment; - Figure 11a and 11b show a sectional diagram of weaving of the preform, according to a third embodiment and its deployment; - Figures 12 to 14 are cross-sectional drawings of weavings according to other variants. FIGS. 1a and 1b show an omega-section stiffener according to the invention, intended to be fixed inside (that is to say in the concave face) of a skin to be stiffened (not shown) bent around an axis, such as an axisymmetric ferrule portion or an entire ferrule. In the example shown, this stiffener has a slot 12 disposed in a plane perpendicular to the bending axis A, which separates two sole portions 2 interconnected by the core 4 of the stiffener. As can be seen in particular in FIG. 1b, the core 4 of the stiffener has substantially a U-shaped section, comprising a bottom 6 and two inclined flanges 8. FIGS. 2a and 2b show in folded-down views and in cross-section a example of weaving mode of the preform for making the stiffener of Figures 1a and 1b, which is woven continuously with an advance indicated by the arrow F1. Figure 2a shows the organization scheme of the son plies. The weave comprises different layers of warp yarns comprising, in the plane of the sole 2, two lateral parts comprising common warp yarns 20 for the weft yarns 26 of the sole 2 of the preform and for the weft yarns 28 of the soul 4 of the preform. Figure 2b shows an example of interweaving weaving between warp son and weft son in a pattern of taffeta or canvas type. In the central part of the preform, the warp yarns 22 of the soleplate 2 and the warp yarns 24 of the core 4 form two separate plies of tissue with the respective weft yarns 26 and 28. A preform is obtained. whose sole side portions 2 are strongly connected to the core 4 by crossing the two series of weft son 26, 28 with the warp son 20 of these side portions. Figure 3 shows the shaped view of the preform with the different groups of wires. The rotational mandrel 46 shown illustrates the general shape of the preform.
    [0006] FIG. 4 shows a following step which continuously performs with a cutting tool 32 a section 30 of the wires 26 of the central part of the sole plate, in order to form the slot 12. FIGS. 5a (respectively 5b) and 6a (respectively 6b) ) show a loom 40 which continuously produces the preform, coming to wind around a mandrel 46 comprising a central circular groove 44 having a profile for making the core 4 of the preform and an additional sector 47 to form the central portion of the sole 2 above the core 4, (respectively a mandrel 46 for forming the sole 2 and 10 an additional sector 47 to form the core of the stiffener). The weaving thus produced in shape gives the preform a predisposition to adapt to an axisymmetric shape such as a ferrule with a circumferential stiffener called omega, without creases or distortions or slippage son. In practice, it is difficult to weave a preform of this type at one time if the wings 8 of the core form too much an angle with the bottom 6 or with the lateral parts of the sole 2. In practice, it is desirable that this angle does not exceed 30 °, if possible does not exceed 15 °. When the diameter of the ferrule for which the preform is intended is important, or the angles of the flanges 8 of the core of the omega stiffener are too great compared to the sole 2, the profile of the mandrel 46 is not the of the piece, but it is a kind of similarity, as is known in the field of weaving shaped, also known as "weaving contour" (or "contour weaving" in English terminology): lengths of the section segments of the mandrel 46, are the same as on the preform of the stiffener deployed on the workpiece, and for each point of all these segments the ratio between the radius on the workpiece and the radius of the mandrel is constant . Such a weaving technique makes it possible to produce left preforms, that is, three-dimensional woven elements having a curvature in space.
    [0007] In particular, the mandrel 46 has a cylindrical groove bottom 44 in which the bottom 6 of the core of the preform is fitted, comprising two inclined flanks in which the inclined flanges 8 of this core fit, this groove being framed by two cylindrical cores 42 receiving the sole 2 of the stiffener. The mandrel 46 and the additional element 47 thus form the weaving of the preform leaving the loom 40. The element 47 must cover a minimum angular sector of mandrel to ensure the call of the warp son according to the diameter appropriate to its outer shape, so that the weave it supports has the defined shape.
    [0008] Preferably it will cover at least 30 ° angle. Preferably it will cover at least 45 ° angle. And preferably still it can reach at least 80 ° angle. As the preform weaves, it must move relative to this element 47. To do this, we can keep the stationary element relative to the loom, the preform only sliding on the outer surface of the element as the mandrel 46 rotates. In another embodiment of the loom, the element 47 will have a sequential and alternating rotation movement, sometimes rotating with the mandrel 46, sometimes performing an inverse angular value rotation to bring it back to its initial position. The length of the segment 47 will be chosen as a function of the weave or interlacing density between the web plies of the web and the webbed by the webs of webs so that the shape of the preform is stabilized beyond the web. 47. Particularly in the case of textiles for aeronautical structural applications, woven fiber tows (often carbon fibers and / or glass fibers, or ceramic fibers) have widths ranging from a few tenths of millimeters to a few millimeters, thus finds fiber densities of the order of 2 to 10 fibers per cm. A length of 5 to 10 cm of woven preform provides sufficient interlacing between fibers to provide good weaving stability. An element 47 whose perimeter along which the warp son are maintained by at least a few centimeters then responds to the objective of stabilizing the preform shape before loosening of the shape 47 and possible spacing of the mandrel 46. L cutting tool 32 is disposed at the outlet of the mandrel 46, in order to continuously cut the central portion of the sole to form the slot 12.
    [0009] FIG. 7 shows another variant of weaving, which differs from that of FIG. 1 in that the sheet of warp yarns 22 defining the sole 2, is superimposed on the lateral portions 20 of the warp yarn 20, 24 of which the central portion 24 defines the soul of the preform. The weft yarns 26 and 28 intersect both the lateral portions of the ply 26 and the ply 20, 24: this gives a very good cohesion between the flange 2 and the core 4 of the ply. preform, and the amount of warp fibers in these areas is increased. It should be noted that the shapes of section of revolution of ferrule, respectively of stiffeners, are given by way of example and are not necessarily straight respectively trapezoidal, but may have curvilinear shapes. For example the mandrel 46 shown in Figure 6b, has a conical shape corresponding to a conical-shaped ferrule to be draped with the woven preform according to the invention. It could have a barrel shape too. Likewise, the shape of the flared U-shaped core 4 may have a wavy shape. Figure 8 shows the organization scheme of a second embodiment of a weave having a sole 2 which is produced in two parts to directly form the central slot 12 during this weaving. At the slot 12, the sole 2 does not have warp threads, and the weft threads 26 of the sole 2 are separately inserted to separately weave each of the sole portions, to obtain an already formed slit. This avoids the insertion of the tool 32. In the most common application of the invention, the preform is intended for a ferrule of larger diameter than the mandrel 46. FIGS. 8a to 8c show the shape transformation of the stiffener as the coil diameter extension of the sole of the preform from those seen on the mandrel (FIG. 8a) to those expected on the part to be molded (FIG. 8c). The adaptation of one form to another meets the rules of ratio compliance of the respective diameters at any point of a section of the preform and length retention of transverse segments. The increase in winding diameter results in the straightening of the flanges 8 of the core and the increase in the angles between the flanges 8 and the bottom 6 or the sole portions. In the case of FIGS. 8a to 8c, the initial gap between the two sole portions is narrow during the weaving of the preform, which causes, when the preform is deployed, an overlap of the two central parts of the sole 2. Figures 8d to 8f show a variant for which the slit made during weaving is wider, the central parts of the soleplate do not overlap when increasing the diameter of the preform. When the ferrule shape supporting the stiffener is substantially cylindrical, the winding diameters of all the warp 20 and 22 are substantially identical. The preform according to the invention can thus also be produced according to other embodiments making it possible to avoid the use of the separate element 47 associated with the mandrel 46, and to require only a mandrel 46, of the adapted form. FIGS. 9a to 9c show another variant of the same weaving mode of the preform in which the sole 2 is made in two separate strips to form the central slot 12. In this variant, the sheet of warp yarns 22 is separated into two parts, each of them being superimposed with the plies of warp son 20 on each of the side parts. As in the first embodiment, a first weft yarn 28 crosses all the yarns of the web 20, 24 to connect the web of the stiffener and the sole side portions. The weft yarns 26, along a first transverse path, are woven with the side warp yarns 20, and in a second transverse outward path are woven with the superposed warp yarns 22. The sole 2 is thus formed in two parts each folded on itself.
    [0010] Figures 9b and 9c show the deployment of these two parts of the sole 2, pushing each of these two parts towards the center as indicated by the arrows. FIG. 9c shows these two parts of sole 2 completely deployed, which thus form this flattened soleplate, comprising central slot 12. In the same way as in the previous variants, a very good cohesion between sole 2 and the core 4 of the stiffener preform. FIG. 10a shows a third embodiment of the preform according to the invention in which the warp son plies 22 are distributed superimposed on the warp son plies 20, and the weft threads 26 of the core are woven with the chain yarn 20, and other weft threads 30 of the core are woven on the other hand with the warp threads 22. Only a weft thread 28, respectively 30 is shown in FIG. 10a, but of course according to FIG. different weft columns, by any weaving pattern known to those skilled in the art, we can ensure the binding of all the warp son of each sheet with all of the weft son associated. As in the variant of Figures 9a to 9c, it is then by turning the woven parts with the son plies 22 to form the central portion of the sole of the stiffener, as shown in Figure 10b.
    [0011] In this case the weft fibers of the core 28 and 30 bind the two parts of the flanges with the warp yarns 20 and 22. FIG. 11a shows another embodiment of the preform according to the invention in which the weft yarns connect, in groups of two, the three sections of preform section. The omega section is made up of three parts: the core 4 covered by the chain layers 24, the outer sole parts covered by the warp plies 20, and the sole center portions covered by the warp plies 22 .
    [0012] As in the variant of FIG. 9a, the weft yarns 26 bind the warp yarns 20 and the warp yarns 22 in a shuttle weave mode of the weft yarn back to the end of the plies 20 and 22 close to the core 4. As in the embodiment of FIG. 10a, other weft threads 30 bind the plies of warp yarns 24 of the web 4 and the warp plies 22, on the one hand, and other chain yarns 28 bind the webs of warp yarns 24 of the web 4, and the webs of warp yarns 22 of the central part of the soleplate 2. Thus, an extremely coherent bonded set is obtained between the webs 28. 10 different parts of the stiffener. As in the variant of Figures 9a to 9c is obtained the shaping of the sole 2 by turning the woven parts binding the chain plies 22 as shown in Figure 11b. The examples of interleaving between frame and string son are given as indicative in the previous figures. Those skilled in the art may consider weavings according to various known possible patterns, such as serged or satin taffeta. Attention may be given to the pattern in the vicinity of the connection between the core and the sole, in particular by preferring patterns in which the paths of the frames are balanced in the thickness, in order to limit any possible lengths or tension of the wires. 20 frames, especially in the variants requiring the overturning weaves of the central part of the sole. The method according to the invention also makes it possible to produce preforms whose weft threads have on all or part of the width of the preform a certain orientation with respect to the warp threads other than 90 ° (for example 45 °). For this, we consider different steps between the weave shape and the final shape of the part having these frames inclined at an angle different from 90 ° with respect to the warp son. The first step is to rotate the slanted weft yarns back to 90 ° with respect to the warp yarns, while keeping the length of weft yarns between two strings, so the sections of the different string columns are then more spaced by a factor 1 / cos (initial angle at 90 ° angle) x the initial distance. To this new transversely expanded form, then, if necessary, the conversion of the mandrel diameters of the various string columns according to the rules adapted to the weave in form, or a single factor of reduction of the totality of the diameters of the form, is then applied, and an increase in the spacing between the different diameters so that each frame length necessary to connect these different carrier diameters of chain columns remains identical to that on the final shape.
    [0013] After weaving, the unfolding and shearing or shearing of framewire angles with respect to the warp yarn in the considered areas, relative to the application to the desired workpiece shape, will then reproduce the desired angle. Other complementary variants of the preform embodiment may optionally be added to the above, in particular to obtain a thicker preform in certain areas while producing a preform at one time. It is possible to have several layers of warp yarns 24 in the zone of the web 4 which are then bound by one or more layers of yarns 20 of webs 28 or 30, for example according to a layer-to-layer multilayer weave mode. layer or multilayer interlock. Several layers of warp yarns 20 can be arranged in one or both of the side portions of the sole 2, connected by one or more layers of weft threads 28, 30 or 26. Several layers of webs can be arranged. chain yarn 22 in one or both of the central parts of the sole 2, connected by one or more layers of weft yarns 26. The multilayer weaving then gives the said zone even more connection between the fibers and makes it possible to produce in one go the preform 30 reducing the number of tissues to be arranged in the molding form to make the part.
    [0014] Depending on the stresses to which the part is subjected, it may be useful to complete the draping of the shape by adding to the preform according to one of the previous variants or combination of several of these successive layer variants. By way of non-limiting example, FIGS. 12 to 14 show stiffener preforms obtained by combining the preforms according to the invention with other techniques. FIG. 12 shows a sectional diagram of an example of a preform that can be obtained for example starting from the preform obtained according to any one of the preceding processes, on the sole of which tissue plies are superimposed by any conventional method, or by a shaped weaving process, such as a draping method. FIG. 13 shows a variant in which a preform is made according to any one of the preceding methods, then other preforms 50 also made by contour weaving are reported on this preform by interlocking, possibly having orientations of different weft threads. (For example at +/- 45 °), in order to offer an optimal resistance to the forces which the stiffener will eventually be subjected to. Note that we can consider combining the processes of Figures 12 and 13.
    [0015] FIG. 14 shows a variation of the precepts according to FIG. 12 or 13 according to which, after having assembled a certain number of complementary fabrics with a preform according to the invention, connections are made between these different elements by seams such as for example according to methods of "tufting" or "stitching" (stitching, sewing).
    [0016] More generally, it should be understood that the invention extends to all the combinations of the previously exposed variants: it is thus possible to envisage any number of tissue layers whose chains are linked together at least partly in the lateral parts of the preform, possibly even in the core of the preform, combined with any number of layers of fabric reported by draping, sewing or interlocking (in the case of a fabric itself obtained by contour weaving).
    [0017] It will also be noted that, in the foregoing, it has been attempted to describe a preform adapted to a stiffener intended to be placed in the concavity of a bent piece to be reinforced. The same variants can also be applied for a stiffener arranged in protrusion of the convex face of a bent piece to be reinforced. In general, the present invention thus makes it possible in a simple and effective manner, with an industrial weaving method known per se, to form a preform comprising a good connection between its sole and its core, thereby preventing any phenomenon. peel.
    [0018] Moreover, this process can be performed automatically, with reduced costs and good repeatability of the result obtained. This method is particularly suitable for making stiffeners for curved parts of nacelles of turbojet engines for aircraft. In particular, concave face circumferential stiffeners are particularly suitable for reinforcing nacelle elements such as outer air intake shrouds, external nacelle hoods, external grid inverter hoods or external ferrule elements. and door reverser doors. They can also be used for curved panels or holsters of aircraft such as fuselage elements, fuselage door elements. Convex-facing stiffeners are particularly suitable for reinforcing propulsive overall axysimetric elements such as internal air intake shrouds, turbojet fan housings, turbojet engine intermediate or rear crankcases, and more generally axisymmetric crankcases.
    权利要求:
    Claims (21)
    [0001]
    REVENDICATIONS1. A woven shaped preform having an omega section comprising a core (4) and a sole (2), characterized in that at least a portion of said core (4) and at least a portion of said sole ( 2) comprise common weft yarns (26, 28, 30).
    [0002]
    2. Preform according to claim 1, characterized in that the frames (26) of the sole (2) connect the chains (20) of the side portions of the sole to the chains (22) of the central portion of the sole (2). and in that the webs 10 of the web (28) connect said chains (20) of the lateral parts of the sole (2) to the chains (24) of the central part of the core (4).
    [0003]
    3. Preform according to claim 1, characterized in that some frames (30) of the sole (2) bind a web of chains (22) of the side portions of the sole (2) to the chains (24) of the central portion of the web (4), and in that other webs (28) link another web of webs (20) from the side portions of the webbed (2) to the webs (24) of the core portion of the web (4).
    [0004]
    4. Preform according to claim 1, characterized in that some frames (26) of the soleplate (2) bind at least one chain ply (20) of the lateral parts of the soleplate (2) to at least one ply of chains. (22) center portions of the sole (2), and in that other frames (28, 30) connect the chain plies of the sole (20, 22) to the chains (24) of the central portion of the sole soul (4).
    [0005]
    5. Preform according to any one of the preceding claims, characterized in that said core (4) comprises a superposition of fabrics whose chain plies are at least partially interconnected.
    [0006]
    6. Preform according to any one of the preceding claims, characterized in that said sole (2) comprises a tissue superposition of which the chain plies (20, 22) are at least partially interconnected. 30
    [0007]
    7. Preform according to any one of the preceding claims, characterized in that said core (4) comprises a superposition of tissuesrepended on one another by interlocking fabrics (50) of corresponding shape.
    [0008]
    8. Preform according to any one of the preceding claims, characterized in that said sole (2) is formed of two parts separated from each other.
    [0009]
    9. Preform according to claim 8, characterized in that said two parts overlap partially.
    [0010]
    10. Preform according to claim 8, characterized in that said two parts are separated from one another so as to define a slot (12).
    [0011]
    11. Preform according to any one of the preceding claims, characterized in that said core (4) is in the concavity of said preform.
    [0012]
    12. Preform according to any one of claims 1 to 10, characterized in that said core (4) is on the convex portion of said preform.
    [0013]
    13. Preform according to any one of the preceding claims, characterized in that the weft son (28) of said core (4) form an angle different from 90 ° with at least a portion of the warp son (24) of said soul (4). 20
    [0014]
    14. Preform according to any one of the preceding claims, characterized in that said soleplate (2) or said core (4), or both, further comprises a superposition of fabrics attached to one another by draping.
    [0015]
    Preform according to claim 14, characterized in that at least some of the fabric elements and the preform are stitch-bonded.
    [0016]
    16. Stiffener, characterized in that it is obtained by impregnation resin, then baking, a preform according to any one of the preceding claims.
    [0017]
    17. A method of manufacturing a preform according to any one of claims 1 to 15, characterized in that this preform is made by weaving contour on a winding mandrel (46) having a groove (44) or an outgrowth for weaving in the form of the core (4) and the sole (2) of the preform.
    [0018]
    18. Manufacturing process according to claim 17, characterized in that the sides (8) of said preform are tightened in order to reduce the width of this substantially cylindrical woven preform while increasing the winding diameter of said core ( 4) and said sole (2).
    [0019]
    19. Manufacturing method according to one of claims 17 or 18 for the production of a preform according to claim 8, characterized in that said sole (2) at the output of the loom is cut to form said slot central (12).
    [0020]
    20. The manufacturing method according to one of claims 17 or 18 for the production of a preform according to claim 8, characterized in that said sole (2) is made by at least two additional side chain plies (22). ) loosened weft son (28) of the core (4) of the preform, 15 and in that unfolds these side portions towards the center of the preform.
    [0021]
    21. Plate especially for aircraft nacelle, characterized in that it is reinforced by at least one stiffener according to claim 16.
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    FR3100158A1|2021-03-05|Fibrous texture for the manufacture of a composite material part and associated manufacturing process
    同族专利:
    公开号 | 公开日
    WO2015136213A1|2015-09-17|
    EP3117034B1|2020-06-03|
    US20190106817A1|2019-04-11|
    FR3018286B1|2016-05-27|
    US10655250B2|2020-05-19|
    EP3117034A1|2017-01-18|
    US20160376735A1|2016-12-29|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US836642A|1905-01-30|1906-11-20|Russell Mfg Co|Bandoleer or belt.|
    US962331A|1909-07-29|1910-06-21|William C Fisher|Method of making cartridge-belts.|
    DE102008028865A1|2008-06-19|2009-12-24|Eads Deutschland Gmbh|Profile preform for producing a fiber composite profile component, as well as production and use of such profile preforms|
    US20130108417A1|2010-03-02|2013-05-02|Herakles|Fiber preform for a turbine ring sector, and its method of fabrication|
    DE102010030550A1|2010-06-25|2011-12-29|Technische Universität Dresden|Composite component e.g. T-profile component, for use in e.g. aircraft, has support and stiffening elements formed as textile fabric unit, where distance between base points of support corresponds to height of each element|
    US20130270389A1|2010-12-13|2013-10-17|Snecma|Fibrous structure for a part made of composite material having one or more archshaped portions|WO2017149252A1|2016-03-02|2017-09-08|Safran Aircraft Engines|Facility and method for manufacturing a belt-shaped fibrous texture having a changing profile in cross-section|
    FR3066719A1|2017-05-24|2018-11-30|Safran Nacelles|HOLLOW PIECES WITH INTEGRATED CIRCONFERENTIAL STIFFENER BY MECHANIZED DRAPING|FR2497839B1|1981-01-12|1984-03-09|Brochier Fils J|
    GB8423219D0|1984-09-14|1984-10-17|Raychem Ltd|Shaped woven fabrics|
    JPH0823095B2|1989-06-06|1996-03-06|東レ株式会社|Reinforcing fiber fabric|
    JP4677950B2|2006-03-31|2011-04-27|株式会社豊田自動織機|Three-dimensional fiber structure and composite material, and method for producing three-dimensional fiber structure|
    US8758879B2|2012-06-24|2014-06-24|The Boeing Company|Composite hat stiffener, composite hat-stiffened pressure webs, and methods of making the same|
    EP2769885B1|2013-02-22|2016-04-13|Autoliv Development AB|An air-bag|FR3046613B1|2016-01-11|2018-02-09|Safran|METHOD FOR MANUFACTURING A TEXTILE STRUCTURE WITH A VARIABLE THICKNESS|
    CN106903905A|2017-03-08|2017-06-30|西北工业大学|A kind of mould of c-type suitable for VARI with muscle wallboard composite and method|
    RU2020112765A3|2017-10-12|2022-01-13|
    法律状态:
    2016-02-12| PLFP| Fee payment|Year of fee payment: 3 |
    2017-02-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-22| PLFP| Fee payment|Year of fee payment: 5 |
    2018-03-02| CD| Change of name or company name|Owner name: SAFRAN NACELLES, FR Effective date: 20180125 |
    2020-02-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-02-18| PLFP| Fee payment|Year of fee payment: 8 |
    2022-02-21| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451946A|FR3018286B1|2014-03-10|2014-03-10|WOVEN PREFORM FOR REALIZING A CIRCUMFERENTIAL OR TORIC REINFORCEMENT WITH A SECTION IN OMEGA|FR1451946A| FR3018286B1|2014-03-10|2014-03-10|WOVEN PREFORM FOR REALIZING A CIRCUMFERENTIAL OR TORIC REINFORCEMENT WITH A SECTION IN OMEGA|
    PCT/FR2015/050592| WO2015136213A1|2014-03-10|2015-03-10|Woven preform for producing a circumferential or toroidal reinforcement having an omega-shaped cross-section|
    EP15717539.9A| EP3117034B1|2014-03-10|2015-03-10|Woven preform for an annular reinforcement with an omega-shaped cross-section|
    US15/262,029| US10655250B2|2014-03-10|2016-09-12|Woven preform for producing a circumferential or toroidal reinforcement having an omega-shaped cross-section|
    US16/212,738| US20190106817A1|2014-03-10|2018-12-07|Woven preform for producing a circumferential or toroidal reinforcement having an omega-shaped cross-section|
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