• 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:
    The invention relates to a method for producing a three-dimensional composite part with a thermoplastic matrix and continuous reinforcement, characterized in that it comprises the steps of: a. obtaining a fiber preform (100) prepreg, by three-dimensional knitting; b. placing the preform on the punch (120) or in the die (110) of a tool defining between them, a closed sealed cavity; vs. closing the tooling so as to apply a first pressure to the preform; d. bringing the cavity to the melting temperature of the polymer impregnating the preform while maintaining the first pressure; f. cooling the cavity comprising the preform to a temperature suitable for demolding while maintaining the second pressure; boy Wut. open the mold and unmould the piece.
    公开号:FR3069479A1
    申请号:FR1770791
    申请日:2017-07-25
    公开日:2019-02-01
    发明作者:Jose Feigenblum
    申请人:RocTool SA；
    IPC主号:
    专利说明:

    The invention relates to a method and a device for manufacturing a composite part of complex shape. The invention is more particularly intended for the production of a composite part in 3 dimensions such as a box or a dome, or even comprising a plurality of protruding reliefs. The invention also applies to the production of tubular parts, in particular comprising the joining of several tubes, such as exhaust manifolds. The invention applies to many fields, in particular, but not exclusively, to the production of luggage or hoods for electronic equipment such as tablets or television screens, the production of helmets or protective equipment, more generally to three-dimensional composite parts produced in large series.
    The prior art in these fields is for example illustrated by document EP 2 694 277. This document describes the production of a rectangular shell shape with fallen edges, in the general form of a 5-sided box, from '' a flat blank, consisting of a stratification of fabrics pre-impregnated with a thermoplastic polymer. Said fabrics are formed and compacted / consolidated into a composite part reinforced by continuous fibers, by a punch-matrix assembly, while a blank holder device makes it possible to keep the fibers under tension during the conformation of the lamination to the desired shape. This technique gives satisfaction but imposes a consequent trimming of the part produced after forming and consolidation, and does not allow deep stamping. The “trunk corners” connecting the trihedral junctions between the faces of the box are particularly stressed areas, in which the wringing of the polymer is likely to occur, revealing uncoated, unsightly fibers, or even folds or tears.
    The invention aims to remedy the drawbacks of the prior art and to this end relates to a method for producing a three-dimensional composite part with a thermoplastic matrix and continuous reinforcement comprising the steps consisting in:
    at. obtaining a preimpregnated fiber preform, by three-dimensional knitting;
    b. place the preform between the punch and the die paired with a tool, defining between them, a sealed closed cavity;
    vs. close the tooling so as to apply a first pressure to the preform;
    d. bringing the cavity to the melting temperature of the polymer impregnating the preform while maintaining the first pressure;
    e. cooling the cavity comprising the preform to a temperature suitable for demolding while maintaining the second pressure;
    f. open the mold and unmold the part.
    Thus, the knitting process makes it possible to obtain a complete three-dimensional preform without assembling plies and without shaping by deformation. . The use of a closed cavity associated with the pressure-temperature cycle makes it possible to directly obtain a part with finished dimensions with sharp edges that do not require trimming. The depth of the stamping is not limited due to the absence of forming. The preform is pre-impregnated with a thermoplastic polymer, it can be stored without time limit and produced at a site remote from the processing site. The method is therefore particularly suitable for industrial mass production adapted to the fields targeted by the invention.
    The invention is advantageously implemented according to the embodiments and the variants set out below, which are to be considered individually or according to any technically operative combination.
    According to one embodiment, the method which is the subject of the invention comprises, before step d) a step consisting in vacuuming the molding cavity delimited by the punch and the die and containing the preform. Thus, the evacuation of said cavity and the application of the first pressure make it possible to degass the preform and a good impregnation thereof during the melting of the impregnation polymer.
    Advantageously, the process which is the subject of the invention comprises between steps d) and f) a step consisting in:
    g. maintain the temperature for a time suitable for the impregnation of the preform by the polymer.
    This holding time, which is a function of the viscosity of the polymer and of the fiber thickness, ensures uniform impregnation of the preform.
    Advantageously, a second pressure is applied (445) to the preform during step g). Thus, the application of the second pressure, when the polymer constituting the matrix is already fluidized, makes it possible to carry out the compaction. Maintaining this pressure during cooling allows the thickness and shape of the part to be calibrated.
    Advantageously, the knitted preform is obtained from a yarn consisting of the reinforcing fiber mixed with a yarn consisting of the impregnation polymer. This embodiment ensures uniform impregnation of the preform during steps d) and e).
    Equivalently, the knitted preform is obtained from a yarn consisting of the reinforcing fiber coated with the impregnation polymer.
    According to another alternative embodiment, the preform is knitted from a thread consisting of the reinforcement and a thread consisting of the impregnation polymer.
    According to a particular case of this latter variant, the reinforcing fiber is a polymer whose melting temperature is higher than the melting temperature of the impregnation polymer.
    According to an alternative embodiment, the preform is knitted using the arrow knitting technique. This variant uses the most widespread and versatile knitting technique in terms of achievable shapes, however in many cases, finishing or closing the three-dimensional preform requires sewing.
    To this end, according to variant embodiments of this embodiment, the process which is the subject of the invention comprises before step b) a sewing step for closing the contour of the preform. This embodiment makes it possible to prepare preforms of closed contour ready to be used, even if the knitting technique does not allow this characteristic to be obtained directly during knitting.
    Alternatively, the process comprises between steps b) and c) a step consisting in:
    h. close the outline of the preform with a weld, t
    This embodiment takes advantage of the constitution of the preform incorporating the impregnation polymer. This welding is carried out before step b) or when the preform is placed on the punch or in the die, this in order to ensure precise positioning of said weld.
    According to another alternative embodiment, the preform is knitted using the technique of the deferred mesh. This technique produces, depending on the variant, a single or double jersey fabric and allows a three-dimensional preform to be produced in a single piece without seam or joint, at the cost of higher knitting complexity.
    According to an advantageous embodiment of the process which is the subject of the invention, the first and the second pressure are applied to the preform by varying the air gap between the punch and the die between two values, at the level of the closed cavity. This embodiment provides more precise control of the thickness and therefore of the calibration of the preform.
    The invention also relates to a tool for implementing the process which is the subject of the invention, which tool includes:
    x. a punch made of an electrically conductive material;
    there. a matrix matched to the punch so as to form a cavity between the molding surfaces of the punch and the matrix, and made of an electrically conductive material;
    z. an induction circuit for heating the molding surfaces of the punch or the die;
    u. a high frequency current generator to power the induction circuit.
    The use of induction as an independent tool heating mode reduces cycle times and mass production of parts.
    According to one embodiment, the cavity delimited between the punch and the die has a taper widening towards the base of the punch. Thus, the pressure on the preform is controlled by the relative displacement of the die and the punch, which depending on the taper along the fallen edges, makes it possible to control the value of the air gap in the closed cavity on all the faces of the preform. .
    Advantageously, the punch or the die comprises a cooling circuit for the circulation of a fluid. This arrangement reduces the cycle time for producing a part by speeding up step f) of the process.
    Advantageously, the molding surfaces of the punch and of the matrix delimiting the cavity are made of a ferromagnetic material whose Curie point is equal to the melting temperature of the polymer impregnating the preform. This embodiment simplifies the control of the temperature in the cavity, in particular to avoid burns when the reinforcing fibers of the preform are subject to this phenomenon.
    According to one embodiment of the tools for implementing the process which is the subject of the invention, it comprises a matrix made of a thermally conductive material and an inductor extending in a cavity formed in said matrix in which the volume of the molding cavity is variable independently of the approximation of the punch and the die. This embodiment is suitable for the implementation of a preform comprising fibers which are electrically conductive or not. The variation in the volume of the molding cavity makes it possible to ensure compaction and calibration in thickness of the finished part.
    According to an alternative embodiment of this embodiment of the tool object of the invention, the punch comprises an inflatable bladder. This variant ensures uniform pressure over the entire surface of the preform, especially during steps e) and f) of the process.
    According to another variant of this embodiment of the tool, the punch comprises a movable part actuated by the bringing together of the die and the punch. This variant makes it possible to control the air gap, therefore the thickness of the finished part in the molding cavity.
    According to another variant, the punch consists of a flexible cover on which gas pressure is applied for carrying out steps c) to f) of the process which is the subject of the invention.
    Advantageously, the cover comprises on its face in contact with the preform, a charge of a material sensitive to induction heating. Thus the sheet participates in the uniform heating of the preform.
    The invention is set out below according to its preferred, non-limiting embodiments, and with reference to FIGS. 1 to 4, in which:
    - Figure 1 shows an example according to a sectional view an embodiment of a tool, shown in the open position, for the implementation of the invention
    FIG. 2 shows two examples of preform knitted in the shape of a half shell comprising trihedral connection zones:
    - Figure 3, illustrates in a sectional view and in the open position another embodiment of a tool for the implementation of the method of the invention;
    - And Figure 4 shows a block diagram of the process object of the invention.
    Knitting techniques are known in the prior art and allow a three-dimensional assembly of a plurality of interlaced threads to be carried out according to loops or stitches. Depending on the knitting mode used, complex preforms are produced in a single knitting operation. According to other knitting techniques, the outline of the piece cannot be closed and in this case requires a step of closing by sewing, or more advantageously by welding as explained below. The knitting step of the process which is the subject of the invention is advantageously, but not exclusively, carried out by means of a flat-knitted loom which offers the most versatility in terms of achievable shapes and closed contour. The forms that can be produced include box shapes comprising trunk corners, shapes substantially in the shape of a dome or cap, such as a helmet, tubular shapes comprising tube junctions, or even a combination of these different shapes, possibly comprising recesses.
    According to the prior art, three-dimensional knitting is used for the production of dry fibrous preforms, subsequently impregnated with a thermosetting resin by a process using a transfer of liquid resin into a mold, such as the RTM process (Resin Transfer Molding). ). This process is however not suitable for mass production. The process which is the subject of the invention uses a knitted fibrous preform, comprising in itself the polymer which will constitute the matrix of the composite part. To this end, the knitting step of the process which is the subject of the invention uses reinforcing fibers such as glass, carbon, aramid, metallic, polymer fibers, or natural fibers such as flax, coconut, sisal, jute, or bamboo, if necessary previously sized and spun, or a combination of these fibers, combined with the thermoplastic polymer constituting the matrix of the future composite part. By way of examples, said polymer is introduced as a bundle to the reinforcing fibers, for example in the form of strands of said fiber, spun with strands of said polymer and possibly twisted, or in the form of reinforcing fibers coated with said polymer, or again by knitting yarns of said polymer with the yarns made up of reinforcing fibers. Whatever the embodiment, the absence of tackiness of the thermoplastic polymer allows it to be used in conjunction with the reinforcing fibers during the knitting step. By way of nonlimiting examples, said thermoplastic polymer is a polyetherketone (PEK), a polyetheretherketone (PEEK), a polyetherimide (PEI), a thermoplastic polyester, a phenylene polysulfide (PPS), a polyamide (for example PA6 or PA6 -6), an acrylonitrile butadiene styrene (ABS). According to other examples, said polymer is chosen from biobased polymers such as:
    - polyamides (PA), in particular PA11
    - bio-sourced polyethylene (PET);
    - polylactic acid (PLA);
    - or even bio-sourced polyesters
    The combination of the method for obtaining the preform, which intertwines the fibers and allows continuity of this intertwining over the entire shape, and of a thermoplastic polymer, allows the production of light parts particularly resistant to impacts, and depending on the choice of polymer, resistant to temperature and flame. Thus, the process which is the subject of the invention is particularly suitable for producing parts subject to this type of stress, such as luggage elements, personal protective equipment such as helmets, harnesses, shields, elbow pads or knee pads, protective shells or light shielding elements.
    Figure 1, according to an exemplary embodiment of the method of the invention, suitable for the implementation of a preform whose reinforcing fibers are not electrically conductive, the preform (100), previously knitted and comprising the fibers reinforcement and the thermoplastic polymer for impregnating the final part, is placed on the part constituting the punch of the tool.
    Figure 2, according to an example of non-limiting implementation, the preform (100a) is in the form of a shell, comprising trihedral connection zones, called "trunk corners". As an illustrative example, this is a half suitcase shell. According to an exemplary embodiment, said preform (100a) comprises a recess (201) directly produced during knitting of said preform. Compared with the techniques of the prior art for the use of thermoplastic composite materials, such as stamping or compacting into shape, the technique of obtaining the preform by knitting makes it possible to keep in the connection zones, in particular the trunk corners, a reinforcement tau comparable to the reinforcement tau in the rest of the room while avoiding the formation of folds in these same areas.
    Returning to FIG. 1, if the knitting technique allows the production of such a preform according to a closed contour, then, the tooling being in open configuration, said preform (100) is simply threaded onto the punch (110) while styling said punch with said preform (100), after having, if necessary, spray a release agent on said punch. Such an operation is easily carried out manually or by means of a manipulator or a robot. The implementation of the self-heating tool as presented below, allows the punch to be at room temperature during this step.
    Figure 2, according to another embodiment, the knitting technique used, does not allow to close the contour of the preform (100b) and said preform comprises a contour discontinuity, delimited by two open edges (211, 212).
    Returning to FIG. 1, if the knitting technique does not make it possible to obtain a knitted preform of closed contour, then, the preform being placed on the punch (110), the positioning of said preform in the tooling is stabilized by making at least 2 welding points joining the open edges of the contour discontinuity. The presence of the polymer in the knitted preform makes it possible to produce such a weld. Said welding is carried out for example by means of a soldering iron., Alternatively, it is carried out in the form of points or a welding line by other means known from the prior art, such as by laser or by ultrasound. According to this embodiment of the tool, the punch advantageously comprises means for positioning the open edges of the preform relative to one another, for example in the form of pins or hooks threaded into the meshes. Thus, the preform is perfectly positioned on the tool.
    The tool consists of at least two parts (110, 120) separable between an open configuration and a closed configuration, defining a punch (110) and a die (120). The punch and the die are paired so that they delimit between them, at the level of their molding surfaces and when the tooling is closed, a gap (e), exaggerated in the figure, corresponding to the final thickness of the part produced. Thus, the space between the punch and the die defines a molding cavity in which the preform (100) is located.
    According to an exemplary embodiment, means (160) make it possible to evacuate the molding cavity comprising the preform (100) once the tooling is closed.
    According to an exemplary embodiment, the punch and the matrix are made of a ferromagnetic material and are coated on their outer faces, with a continuous layer (111, 121) of an electrically conductive and non-ferromagnetic material, such as copper . When the tool is closed, the parts of the tool constituting the punch and the die are separated from each other by a layer of electrically insulating material (130). This layer of insulating material also seals the cavity formed between the punch and the die when the tooling is closed.
    The die punch assembly is inserted into an induction circuit consisting of two half-turns (141, 142), one of which (141) is integrated into the punch and the other (142) of the die. Closing the tool has the effect of electrically connecting the two half-turns. The coil thus formed, surrounding the tool, is connected to a high frequency current generator (not shown), so that the supply of said coil causes the circulation of induced currents, on the surfaces of the tool. Induced currents flow in a reduced thickness of material on the surface of the tool. Thus, said induced currents flow in the coating layers (121, 111), and due to the cut made by the insulating layer (130) between the two parts of the tool, on the molding surfaces of the cavity defined between the punch and die. Said molding surfaces being made of a ferromagnetic material rapidly rise in temperature due to the circulation of these induced currents at high frequency, and transmit their heat to the preform (100). Under the effect of temperature, the polymer included in the knitted preform is brought to its melting temperature, and, the preform being confined in a closed and sealed cavity, said polymer uniformly permeates the preform. The closing pressure applied to the mold as well as the air gap (e) between the punch and the die, calibrate the thickness of the final part. The use of induction heating, in the configuration of the mold according to this embodiment, makes it possible to concentrate the heating on the molding surfaces of the cavity, without the need to heat the entire mass of the tooling. Said molding surfaces rapidly rise in temperature, said temperature is controlled, for example, by selecting the ferromagnetic material constituting the mold as a function of its Curie temperature.
    Advantageously, the punch (110) and / or the matrix (120) of the tooling comprise channels (151, 152) for the circulation of a heat transfer fluid, for example water, allowing rapid cooling of the molding surfaces. .
    Thus, the molding cavity and the preform (100) being brought to a temperature at least equal to the melting temperature of the polymer included in said preform, said temperature is maintained for a suitable time between a few seconds and 1 minutes, to ensure the uniform impregnation of the preform by the polymer. Said holding time is a function of the rate of fibrous reinforcement and of the viscosity of the molten polymer at the holding temperature. The more viscous the polymer and the higher the fiber content, the longer the holding time. The holding time is easily determined by test.
    After the appropriate holding time, the electrical supply to the coil (141, 142) is stopped, and the molding cavity is cooled by the circulation of a heat-transfer fluid in the channels (151, 152) for cooling the tool. .
    During the heating, holding and cooling stages, the tool closing pressure is maintained.
    According to an alternative embodiment, a second pressure, greater than the first pressure, is applied to the preform at the end of heating and during the holding step. This second pressure is applied, for example, by relatively moving the punch relative to the die. According to an example of implementation, the punch and the matrix have a slight taper, widening towards the base of the punch so that this relative displacement applies said pressure, by reducing the air gap (e), on all preform surfaces.
    When the cooling of the molding cavity by the circulation of the heat-transfer fluid reduces its temperature to a temperature below the glass transition temperature of the polymer, or more generally to a temperature where the rigidity of the polymer is sufficient to be able to handle the part thus produced without deforming it, the mold is opened and the part is removed from the mold.
    Then the cycle resumes with a new preform. The manufacturing time of the part between two mold openings is a function of the size of the part, the nature of the polymer and the fiber content, but in general is between 1 and 5 minutes, essentially a function of time. temperature maintenance.
    The use of induction heating ensures that a sufficient heating temperature is reached during each cycle to ensure uniform impregnation of the part. The heating rate, of the order of 2 ° C. s' 1 , authorized by this heating method, also allows the use of natural fibers, sensitive to burns, without risk of degradation of said fibers.
    The implementation steps described above apply in the same way by initially positioning the preform in the die rather than on the punch and are also suitable for the implementation of a knitted preform whose shape is other than that of half a box.
    Figure 3, according to another example of implementation of the method of the invention, suitable for any type of fiber including electrically conductive fibers, the implementation tool comprises at least two parts, in the form of a punch (310) and a die (320). According to this exemplary embodiment, the matrix (320) is made of a metallic material, good conductor of heat such as an aluminum or copper alloy without these examples being limiting.
    The matrix (320) includes a set of conduits (340) in which inductors (341) extend. Said inductors are in the form of copper tubes or Litz cables. According to an exemplary embodiment, the interior of said conduits comprises a liner (342) made of a ferromagnetic material with a thickness of between 0.2 mm and 2 mm. Thus, when the inductor (341) is supplied with high frequency current, the induced currents flow in the ferromagnetic jacket (342), causing the latter to heat up. The heat is transmitted to the matrix and propagates by conduction to the molding surface of the latter, which rises in temperature. Advantageously, said conduits (340) comprising the inductors (341) are located at a distance d from the imprint of the matrix so as to ensure a uniform temperature on the molding surfaces of said matrix.
    Alternatively the matrix is made of a material, for example a ferromagnetic steel, in this case the lining of the conduits (340) comprising the inductor (341) is not necessary.
    Advantageously, the matrix includes conduits (360) for the circulation of a heat transfer fluid for its cooling.
    The mold is shown here in the open position. The approximation of the punch (310) and the matrix (320) as well as the sealing means (312) make it possible to define a sealed cavity in which the knitted preform (100) is included. Advantageously, the punch comprises a bladder (350) and means (351) for inflating said bladder. The bladder (350) consists of an elastomer resistant to the melting temperature of the polymer included in the preform. For example, said bladder is made of carbon-loaded silicone. This embodiment makes it possible to compact all the faces of the preform, by inflating said bladder, even if the imprint does not include a taper widening towards the base of the punch, or even even includes a reverse taper, for example when the process object of the invention is used for the manufacture of a helmet. In this case, the matrix comprises at least two separable parts to allow the final part to be removed from the mold.
    According to an example of use of the tool according to this embodiment, the knitted preform (100) is inserted into the imprint of the matrix (320); The punch is brought closer to the die creating a sealed cavity in which the preform is included. The bladder (350) is inflated at a first pressure to ensure contact with the preform. The inductors (341) are supplied with high frequency current, which has the effect of heating the molding cavity and bringing to its melting point the polymer included in the knitted preform. The inflation pressure of the bladder (350) is increased so as to ensure the compaction of the preform. The temperature is maintained in the molding cavity so as to ensure uniform impregnation of the preform, this holding time being a function of the fiber content and the viscosity of the polymer. Then, the supply of the inductors is stopped and the heat transfer fluid is sent to the cooling channels (360) so as to cool the mold and the part thus produced, to a temperature suitable for its release. As for the example in FIG. 1, other embodiments are possible, where the punch does not include a bladder and where the heating and cooling means are included in the punch or even in the punch and the die, the preform being disposed on the punch rather than in the die.
    Thus, the combination of the use of a mold with independent induction heating, according to any of the exemplary embodiments presented above or a combination of these exemplary embodiments, with a knitted preform comprising its impregnation polymer makes it possible to produce in large series, in reduced production times and in a single consolidation operation, parts of complex shape comprising a high fiber content. The process which is the subject of the invention is therefore particularly suitable for the production of composite parts aimed at high consumption markets. The combination of a high fiber thickness, of a thermoplastic polymer constituting the matrix and of the mode of organization of the fibers in the composite, makes these parts particularly resistant to impacts and makes it possible to keep a large fiber thickness in areas which according to the methods of the prior art, have a reduced fiber content. However, these zones, in particular the trihedron or trunk corner connection zones, are zones which are particularly stressed on the products targeted by the invention, in particular in terms of impacts, such as on a suitcase shell.
    Figure 4, according to a first step (410) of the process which is the subject of the invention, the preform is knitted so as to correspond to the shape of the final part. Said preform comprises the thermoplastic polymer for impregnating the final part, either in a co-woven form in the knitted yarns, or in the form of a coating on the knitted yarns, or by the knitting of reinforcing yarns and of yarns made of the polymer. impregnation; Said polymer is stable so that said preform can be stored without time limit or produced at a site remote from the processing site. According to a loading step (420), the preform thus obtained is installed on or in the tooling according to any one of its embodiments, the mold being open. According to a particular embodiment, corresponding to the case where the knitting technique does not make it possible to obtain a preform with a closed contour, a step (425) of welding is carried out directly in the tooling in order to keep the contour of the preform closed. . According to an impregnation / consolidation step (430), the mold is closed, thus applying a first pressure on the preform and the molding cavity delimited between the punch and the die is brought to a temperature greater than or equal to the melting temperature of the impregnation polymer. According to a particular embodiment, the method which is the subject of the invention comprises a step 5 (427) of evacuating the cavity comprising the preform after the closing of the mold. According to a holding step (440) the molding cavity and the preform are maintained at the temperature reached during the previous step (430) while maintaining the contact pressure between the molding surfaces of the punch and of the die and the preform. According to an alternative embodiment, the holding step (440) 10 comprises a compacting step (445) consisting in increasing the pressure on the preform, either by bringing the punch and the die or by applying an additional inflation pressure on the expandable means (bladder) of the die or the punch. According to a cooling step (450) the molding cavity and the preform are cooled by the circulation of a heat transfer fluid in the mold, while maintaining the pressure on the preform. Cooling (450) is continued until the temperature in the molding cavity is less than or equal to the glass transition temperature of the impregnation polymer. According to a demolding step (460) the mold is opened and the part demolded. The cycle then resumes at the loading step (420) with a new preform.
    权利要求:
    Claims (19)
    [1" id="c-fr-0001]
    1. Method for producing a three-dimensional composite part with a thermoplastic matrix and continuous reinforcement, characterized in that it comprises the steps consisting in:
    at. obtaining (410) a pre-impregnated fiber preform (100), by three-dimensional knitting;
    b. placing (420) the preform between the punch (120, 320) and the matrix (110, 310) paired with a tool, defining between them, a sealed closed cavity;
    vs. close the tooling so as to apply a first pressure to the preform;
    d. bringing (430) the cavity to the melting temperature of the polymer impregnating the preform while maintaining the first pressure;
    e. cooling (450) the cavity comprising the preform to a temperature suitable for demolding while maintaining the second pressure;
    f. open the mold and unmold (460) the part.
    [2" id="c-fr-0002]
    2. Method according to claim, in which step c) comprises a vacuum (427) of the cavity.
    [3" id="c-fr-0003]
    3. Method according to claim 1, comprising between steps d) and f) a step consisting in:
    g. maintain (440) the temperature for a time suitable for the impregnation of the preform by the polymer;
    [4" id="c-fr-0004]
    4. The method of claim 3, wherein a second pressure is applied (445) on the preform during step g).
    [5" id="c-fr-0005]
    5. Method according to claim 1, wherein the knitted preform is obtained from a wire consisting of strands of reinforcing fiber mixed with strands made of the impregnation polymer.
    [6" id="c-fr-0006]
    6. The method of claim 1, wherein the knitted preform is obtained from a wire coated with the impregnation polymer.
    [7" id="c-fr-0007]
    7. The method of claim 1, wherein the preform is obtained by knitting son consisting of the reinforcing fiber and son consisting of the impregnation polymer.
    [8" id="c-fr-0008]
    8. The method of claim 7, wherein the reinforcing fiber is a polymer whose melting temperature is higher than the melting temperature of the impregnation polymer.
    [9" id="c-fr-0009]
    9. The method of claim 1, wherein the preform is knitted using the arrow knitting technique.
    [10" id="c-fr-0010]
    10. The method of claim 1, comprising before step b) a sewing step for closing the contour of the preform.
    [11" id="c-fr-0011]
    11. The method as claimed in claim 1, comprising between steps b) and c) a step consisting in:
    h. close the outline of the preform (425) with a weld.
    [12" id="c-fr-0012]
    12. The method of claim 1, wherein the preform is knitted using the carry-over technique.
    [13" id="c-fr-0013]
    13. The method of claim 4, wherein the first and second pressures are applied to the preform by varying between two values the air gap between the punch and the die, at the closed cavity.
    [14" id="c-fr-0014]
    14. Tools for implementing the method according to claim 1, comprising:
    x. a punch (110, 310) made of an electrically conductive material;
    there. a matrix (120, 320) paired with the punch so as to form a cavity between the molding surfaces of the punch and the matrix, and made of an electrically conductive material;
    z. an induction circuit (141, 142, 341) for heating the molding surfaces of the punch or of the die;
    u. a high frequency current generator to power the induction circuit.
    [15" id="c-fr-0015]
    15. Tooling according to claim 14, for the implementation of a method according to claim 4, wherein the cavity defined between the punch and the die has a taper widening towards the base of the punch.
    [16" id="c-fr-0016]
    16. Tool according to claim 14, wherein the punch or the die comprises a cooling circuit (360, 151, 152) for the circulation of a fluid.
    [17" id="c-fr-0017]
    17. Tool according to claim 14, in which the surfaces of the punch (110) and of the matrix (120) delimiting the cavity are made of a ferromagnetic material whose Curie point is equal to the melting temperature of the polymer impregnating the preform.
    [18" id="c-fr-0018]
    18. Tool according to claim 14, comprising a matrix (320) made of a thermally conductive material, comprising an inductor (341) extending in a cavity (340) formed in said matrix and in which the volume of the molding cavity is variable regardless of the approximation of the punch and the die.
    [19" id="c-fr-0019]
    19. Tool according to claim 18, wherein the punch comprises an inflatable bladder (350).
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    同族专利:
    公开号 | 公开日
    CN110944827A|2020-03-31|
    CA3071273A1|2019-01-31|
    JP2020530821A|2020-10-29|
    KR20200132831A|2020-11-25|
    AU2018308880A1|2020-02-13|
    EP3658360A1|2020-06-03|
    BR112020001581A2|2020-10-20|
    RU2020107831A|2021-08-25|
    WO2019020583A1|2019-01-31|
    FR3069479B1|2020-07-17|
    RU2020107831A3|2021-11-03|
    US20200238639A1|2020-07-30|
    TW201908113A|2019-03-01|
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    法律状态:
    2019-02-01| PLSC| Publication of the preliminary search report|Effective date: 20190201 |
    2019-07-29| PLFP| Fee payment|Year of fee payment: 3 |
    2020-07-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-07-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1770791|2017-07-25|
    FR1770791A|FR3069479B1|2017-07-25|2017-07-25|PROCESS AND DEVICE FOR THE MANUFACTURE OF A COMPOSITE PART OF COMPLEX FORM|FR1770791A| FR3069479B1|2017-07-25|2017-07-25|PROCESS AND DEVICE FOR THE MANUFACTURE OF A COMPOSITE PART OF COMPLEX FORM|
    AU2018308880A| AU2018308880A1|2017-07-25|2018-07-23|Method and device for the manufacture of a composite component of complex shape|
    JP2020504168A| JP2020530821A|2017-07-25|2018-07-23|Methods and devices for manufacturing composite components with complex shapes|
    EP18740863.8A| EP3658360A1|2017-07-25|2018-07-23|Method and device for the manufacture of a composite component of complex shape|
    TW107125352A| TW201908113A|2017-07-25|2018-07-23|Method and apparatus for manufacturing composite parts having complex shapes|
    CA3071273A| CA3071273A1|2017-07-25|2018-07-23|Method and device for the manufacture of a composite component of complex shape|
    BR112020001581-4A| BR112020001581A2|2017-07-25|2018-07-23|method for making a three-dimensional composite part with thermoplastic matrix and continuous reinforcement|
    KR1020207005410A| KR20200132831A|2017-07-25|2018-07-23|Apparatus and method for manufacturing composite parts with complex shapes|
    PCT/EP2018/069958| WO2019020583A1|2017-07-25|2018-07-23|Method and device for the manufacture of a composite component of complex shape|
    CN201880055134.XA| CN110944827A|2017-07-25|2018-07-23|Method and device for producing composite components having complex shapes|
    RU2020107831A| RU2020107831A3|2017-07-25|2018-07-23|
    US16/633,886| US20200238639A1|2017-07-25|2018-07-23|Method and device for manufacturing a composite part with a complex shape|
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