WO2015018801A1

WO2015018801A1 - Yarn laying head for producing composite parts

Info

Publication number: WO2015018801A1
Application number: PCT/EP2014/066751
Authority: WO
Inventors: Mickael Krzeminski; Ludovic JAGUENAUD; Jean-Christophe LOZES
Original assignee: Airbus Defence And Space Sas
Priority date: 2013-08-06
Filing date: 2014-08-04
Publication date: 2015-02-12
Also published as: FR3009510B1; FR3009510A1

Abstract

A head (10) for laying yarns (50) impregnated with a thermoplastic resin comprises a first system of heating the yarns to be laid, a second heating system for heating a downstream zone (AV) on which the head (10) must lay the yarns and a compacting roller (12) intended to apply, along a line of contact, a bearing force on the yarns (50) during the laying thereof on a form. The compacting roller (12) is movable along a longitudinal axis (22) of the head, the axis of rotation (15) of the compacting roller being fixed in a reference frame of the head. The first heating system comprises a heat generator (13) for raising the temperature of the yarns (50), before the laying thereof and comprises a second heat generator (14) with a laser source for providing heating energy substantially at the line of contact. A system for blowing an inert gas is arranged on the head in order to render the environment of the yarns inert in the vicinity of the line of contact.

Description

HEAD FOR REMOVING THREADS FOR REALIZING WORKPIECES

COMPOSITE MATERIAL

The present invention relates to machines and methods for the manufacture of composite material parts, implementing son placement and / or filament winding. These methods generally consist in depositing son or sheets of pre-impregnated material on a mandrel or on a mold which has the shape of the part to be produced, the deposited material being consolidated either simultaneously or subsequently at its removal.

It will be understood here and in the remainder of the description that the composite materials concerned are materials comprising long mineral fibers, for example glass or carbon, or organic fibers, for example aramid, held in a hard organic matrix, designated under the generic term of resin, for example a polymer whose characteristics are chosen according to the desired performance of the part produced.

More specifically, the invention relates to a winding head and / or son placement suitable for machines for manufacturing composite parts and more particularly relates to machines adapted to the implementation of thermoplastic composite material.

The invention further relates to a method in which the thermoplastic composite materials are implemented by performing a consolidation, that is to say a step during which the desired final state of the material in terms of compaction, density and porosity of the structure of the composite material and the resulting physical properties, are obtained in situ during the placement of the son, without the requirement of a subsequent autoclave type treatment. In the field of wire placement, it is known to provide placement devices that allow to place on a mandrel or a mold son impregnated with a thermoplastic resin.

Such devices must be supplied with son impregnated with the thermoplastic resin, for example in the form of wicks, must bring the son to the softening temperature of the resin and deposit the son at the desired locations on the mandrel or the mold to the shape of the room.

These devices or winding heads, which include the various necessary functions, are generally movable in one direction in the case of winding or in two directions in the case of deposit on a mold and work near the part being produced.

US 5700347 discloses a dispensing head of a plurality of strips impregnated with thermoplastic resin on a mold for producing a composite material part. The head comprises a plurality of devices, in particular a system for controlling the tension of the strips by clutches on the reels for storing the strips to be deposited, a guide for aligning the strips without play between adjacent strips, a device for cutting the strips to length. desired band, a band heater and a cooling device.

To ensure the application of the strips, the head comprises a roller which applies the strips on the mold or on previously deposited folds in an area which is heated and comprises a pressure plate, behind the roller in the direction of movement of the head relative to the mold, which exerts pressure on a surface of the workpiece and which has elements for removing heat from the heated webs before being deposited.

In such a head the removal roller and the pressure plate are integral with a subset of the head which is articulated to take variable positions in inclination depending on the shape of the mold.

Such a head is therefore voluminous and complex and moving parts subjected to heat require extensive cooling which makes the head even more complex. Such a head is therefore poorly suited to the production of parts when the part has areas of difficult access. In these situations, failing to redesign the piece according to the head, it is necessary to carry out retouching or additional steps for the manufacture of the piece.

US 5039368 discloses a device in which thermoplastic filaments to be wound are fed from a vertically moving winding head and deposited on the surface of a mandrel.

The filaments, previously positioned between them, are heated to soften or melt the resin and then pass under a heating compacting roller which bears against the mandrel and which is mounted with axis of rotation offset relative to an axis of orientation for to orient freely under the simple effect of the bearing on the mandrel.

Several layers of the thermoplastic material can thus be deposited, the surface of the preceding layers being heated before the application of the son by the compacting roller.

Such a head for filament winding does not make it possible to control all the parameters which influence the quality of the part produced, in particular the position of the wires and the preheating and heating temperatures, and does not make it possible to produce complex shapes such as closed tanks. with small opening diameters.

In these cases of complex shapes, the requirements lead to voluminous wire placement heads and collision avoidance constraints between the placement head and the workpiece or its mandrel such as other removal parameters. , thread tension, angles, pressure ..., must be de-optimized and slow down the thread removal process and / or limit the dimensions of the workpieces. The invention relates to a head for depositing son impregnated with a thermoplastic resin comprising a first heating system of the wires to be deposited, a second heating system arranged to heat a downstream zone on which the head must deposit the son and a compacting roller for applying in a line of contact a pressing force on the son when they are deposited on a shape corresponding to the shape of the part to be produced.

In addition, in the head of the invention:

- The compacting roller is movable along a longitudinal axis of the head, the orientation of the axis of rotation of the compacting roller, perpendicular to the longitudinal axis of the head, being fixed in a frame of the head;

the first heating system of the wires to be deposited comprises a first heat generator arranged on the head to raise the temperature of the wires, before they are deposited, to a value between ambient temperature and the application temperature, thus realizing a -heating, and comprises a second heat generator comprising at least one laser source as a heating energy source arranged on the head to bring heating energy substantially at the level of the contact line, the temperature of the resin during the removal of son being by this second generator raised to the melting temperature or softening of the resin;

a system for blowing an inert gas, for example nitrogen, is arranged on the head so as to render the environment of the wires near the contact line inert by a depletion of the oxygen medium, the system blowing device comprising at least one blowing nozzle.

It is thus obtained a head of particularly compact size and which provides the heating energy in a localized way to assemble the resin impregnated son by raising their temperature accurately.

In one embodiment, the compaction roll, the first heat generator and the second heat generator of the first heating system are fixed on a rigid support which is movable in translation in the direction of the longitudinal axis of the head.

Thus the relative positions of the elements fixed to the rigid support are not modified and it results in particular that the heat provided by the various heat generators is always diffused or accurately provided particularly with respect to the compacting roller and the line of compression. contact. In one embodiment, the rigid support is movable in translation through one or more pneumatic cylinders supported on a gripping plate of the head.

Such a cylinder makes it possible to obtain a controlled bearing force of the compaction roller when the head is used.

Guides, integrated or not to the pneumatic cylinders, provide if necessary linear guidance of the rigid support without allowing rotation of the plate and thus the guide roller, in particular around the longitudinal axis of the head.

In one embodiment, one or more blast nozzles are attached to the rigid support so as to diffuse in the hottest region near the support line the inert gas to locally form a protective atmosphere.

Advantageously, at least one blowing nozzle is arranged so as to blow the inert gas, previously heated, in an area located downstream of the contact line, that is to say in view of the relative displacement of the head relative to a part in progress a zone of the shape or the part on which wires will be deposited.

Thus, the protective atmosphere formed in the zone just before the removal of the wires is achieved without prejudice to the heating of the wires to be deposited and the wires already deposited on the form.

In one embodiment, at least one blast nozzle is arranged to blow an inert gas on the compaction roll into an area of said compaction roller located upstream of the nip. In this case the gas supplied after the deposition of the son is advantageously at ordinary temperature, the ambient temperature, or even cooled beforehand so that the roll is cooled by this blowing which also participates in the formation of the protective atmosphere around the line d 'support.

The second heating system comprises at least one heat generator, for example an infrared radiation emission ramp, arranged on the head to heat the downstream zone, and in one embodiment, also comprises at least one heat generator, for example an infrared radiation emission ramp, arranged to heat an upstream zone corresponding to a zone with respect to the line of contact on which the wires have been deposited when a part is in progress.

Thus the already deposited wires on which the head will deposit wires are preheated to be brought more effectively to the temperature necessary at the level of the contact line, and the deposited wires are not subjected to too rapid cooling which allows the wires of go through a relaxation phase that participates in a consolidation of the material of the room.

As required, the head comprises juxtaposition means of several son so as to form a sheet without overlap between neighboring son, these means being arranged to form the sheet before the passage of the son on the compacting roller.

It is thus possible to deposit during a pass a sheet of wire that can reach substantially the width of the compaction roller.

The spacing of the yarns at the outlet of the juxtaposition means, defined for example by the shape of a comb which guides the threads, is such that, after having been subjected to the pressure exerted by the compacting roller, two adjacent threads are juxtaposed contiguously and without overlap.

The invention also relates to a system for producing parts made of composite material by deposition of son impregnated with a thermoplastic resin which comprises such a son deposition head impregnated with a thermoplastic resin, which comprises a shape, for example a mold or a winding mandrel, on which the son must be deposited, and which comprises a system for supplying the son impregnated with a thermoplastic resin to the head. Thus, the system benefits from the advantages of the head and in particular a compactness of realization made possible by the arrangement of the elements of the head which makes it possible to produce parts whose shapes are not feasible by deposition of the wires with the known heads. .

In one embodiment of the system, the head is carried by a robot that ensures the desired movements of the head, the robot having axes of displacement, in translation and or in rotation, controlled from the head for: maintaining the longitudinal axis of said head substantially perpendicular to an osculating plane of the surface of the form, mold or winding mandrel, or of the part being produced at the location of the line of contact;

maintain a reference point of a gripping plate of the head at a substantially constant distance from the surface of the mold or of the winding mandrel or part being produced at the location of the line of contact;

orienting an axis of rotation of the compacting roller according to the desired direction of removal for the yarns to ensure a rolling of said compacting roller without appreciable slippage.

Such a robot, for example with five degrees of freedom, makes it possible to produce pieces of complex shapes with important curvatures such as cylindrical tanks with hemispherical bottoms having openings of small diameter.

Advantageously, the system for supplying threads impregnated with thermoplastic resins comprises a system for tensioning the threads to be deposited provided with a catch-up run. Thus variations in wire lengths between the wire supply coils and the compaction roller are compensated by maintaining the desired voltage for the wires.

The tensioning system of the yarns to be deposited ensures, at the level of the compaction roller upstream of the nip following the direction of movement of the yarns, a substantially constant tension of the yarns between 20N and 50N so as to obtain a deposit son with good health matter. The detailed description of an embodiment is made with reference to the figures which show in a nonlimiting manner:

Figure 1: very schematically and simplified a system for producing parts of thermoplastic composite material by deposition son impregnated with a thermoplastic resin;

Figure 2 is a detail view of an embodiment of a deposition head son impregnated with thermoplastic resin. In the drawings, the different parts are not necessarily represented on the same scale.

Figure 2 shows a head 10 of son deposition 50 impregnated with a thermoplastic resin. In the view of Figure 2 the main elements of the head are represented without necessarily being represented the cables and pipes that are necessary for certain elements to supply energy from remote sources or in relation to sensors useful for the control of the head.

The head 10 is a part of a system 100 for producing parts made of a thermoplastic composite material, schematized in FIG. 1, which comprises, in addition to the head 10, a supply system 60 made of wires 50 of the head 10, a robot 70 of the positioning and a form 80 on which are deposited the son 50 by the head 10. In the example shown schematically in Figure 1, the form 80 is a mandrel on which is formed a filament winding.

In this case the son comprise long fibers, mineral or organic, commonly used in the production of parts made of composite materials.

The yarns are in practice packaged in the form of single yarns, tows or webs having a plurality of yarns.

The thermoplastic resin is a resin which has the characteristic of being hard at room temperature and up to the expected temperature values in use for the part to be produced. The resin ensures in practice the cohesion of the son of the room between them and gives the piece an important part of its rigidity. The thermoplastic resin also has the property of softening or melting above a certain temperature, which depends on the resin in question, and to regain its hardness characteristics when the temperature is lowered again.

This characteristic of reversible change in the hardness and the plasticity of the impregnating resin of the threads is put to use during the production of the thermoplastic composite material parts. In the system 100, each wire deposited by the head 10 follows a path from a first end of a functional chain from a wire distributor, for example large capacity coils of the supply system 60, which can be arranged in a rack, and capable of continuously delivering long lengths of son, to an end end where the son will separate from the head 10 and be deposited on the form 80, for example a mold or a mandrel, the piece to realize.

Considering the head 10 of Figure 2, it comprises a plate 1 1 by which said head 10 is fixed to the robot 70.

The head 10 comprises at a free end opposite the plate 1 1 a compacting roller 12. The compacting roller 10 determines a contact line corresponding to the theoretical line of a rolling surface of said compacting roller which is in contact with the piece in progress. The nip is parallel to an axis of rotation of the compaction roller.

The head 10 comprises guide means, not visible in FIG. 2, for conveying the son 50 impregnated with the thermoplastic resin towards the compaction roller 10. In one embodiment, a plurality of threads can be packaged in locks or in a sheet , are conveyed to the compaction roller 12 to be simultaneously deposited on the form 80 so as to cover a larger surface per pass of the head on said form. In the case where several son are conveyed simultaneously, the head 10 also comprises means for adjusting the relative positions of the plurality of son, before their application on the form 80, so that the son are juxtaposed without play or overlap between neighboring sons. Such means for adjusting the relative positions of the threads consist, for example, of a wire guide comb whose characteristics are adapted to the wires used.

A first wire heating system comprises a first heat generator 13 fixed to the head 10 to preheat the wires 50, before the wires arrive on the compacting roller, and so as to raise the temperature of said wires to a minimum. first desired temperature of the impregnating resin son, temperature between room temperature and the softening / melting temperature of the resin. The heat generator 13 is for example a source of infrared radiation.

The first heating system also comprises a second heat generator 14 providing a localized energy near the contact line. The second heat generator 14 is arranged on the head to bring the energy by a downstream side AV of a workpiece in progress, the downstream side AV being defined with respect to the relative movement of the head 10 relative to the workpiece , the head moving from upstream AM downstream AV. The second heat generator 14 is configured to carry the wires at the desired softening / melting temperature of the impregnating resin just prior to the passage of the compaction roller.

In a preferred form, the second heat generator 14 comprises at least one laser source whose beam is directed substantially in the direction of the line of contact.

A second heating system of the head 10 comprises at least one heat generator 16a, 16b fixed on the head 10 for heating the wires deposited on the form 80.

A heat generator 16a downstream AV compacting roller 12 and close to the contact line performs a preheating son deposited on the form 80, for example during a previous passage of the head 10. The son on the form 80 are thus brought to a temperature close to that of the son to be deposited after preheating. The heat generator 16a is for example a source of infrared radiation.

An upstream heat generator 16b AM compacting roller 12 and close to the contact line provides energy in thermal form to the son deposited on the form 80.

The heat generator 16b is for example a source of infrared radiation.

The head 10 also comprises one or more blowing nozzles 17a, 17b of a system for blowing an inert gas such as nitrogen.

The blowing nozzles 17a, 17b are oriented substantially towards the line of contact so that the inert gas locally maintains an inert atmosphere which avoids oxidation of the impregnated threads brought to the softening / melting temperature of the resin.

At least one blast nozzle 17a is attached to the head 10 to blow the inert gas from the downstream AV of the compacting roller 12 towards the nip. Preferably, the gas is preheated before being blown and participates in preheating the wires before the compacting roller passes.

At least one blast nozzle 17b is attached to the head 10 to blow the inert gas from the upstream AM of the compaction roller 12 to said compaction roller. In one embodiment the gas is cooled before being blown and provides cooling of the compaction roll 10 which is subjected to a large heat flow.

In addition, the compacting roller is fixed on a rigid support 20 which is mobile in translation through at least one pneumatic jack 21, whose axis of displacement is parallel to a longitudinal axis 22 of the head 10, which longitudinal axis is perpendicular. to the axis of rotation of the compaction roller

12.

At least one pneumatic jack 21 is supported on the plate 1 1 so as to exert a pressing force on the shape 80 at the compaction roller 12, and regulate this support force to a value suitable for the process, generally included between 40 and 140 DaN.

Guide rails or other means ensure the linear movement of the displacement of the compaction roller 12 so as to take up torsional forces on said compacting roller and to prohibit a modification of the orientation of the axis of rotation 5 of said compacting roller with respect to the plate 1 1.

In a preferred embodiment of the head 10, the compacting roller 12, the heat generators 13, 14, 16a, 16b and the blowing nozzles 17a, 17b are fixed to the rigid support 20 so as to preserve during the operations of removing wires from fixed positions and orientations relative to the contact line of the compaction roller 12. An exemplary implementation of the system 100 is described here in the case of producing a piece of thermoplastic composite material by winding son on a mandrel.

An example of such a part is a tank having a cylindrical central section of circular section whose ends are closed by funds having a spherical cap shape, an axial orifice remaining open on each bottom.

The production of such a part requires complex movements of the head 10, which makes the deposition of the son on the mandrel in rotation, because of the shapes of the bottoms and also because several layers of son are deposited with different orientations by relative to an axis of rotation of the mandrel. In this case, the head 10 is mounted on a robot 70 with five axes of freedom that allow the necessary movements and rotations.

In the remainder of the disclosure, it will be considered that the threads are deposited on the mandrel, including when one or more layers of thread have already been deposited on said mandrel and that the threads are deposited on layers of already deposited threads. This shortcut of language is justified by the fact that the shape of the mandrel is not significantly affected by the layers of son already deposited and that in any case the knowledge of the progress of the process of deposition of the wires , that is to say, the knowledge of the number of layers of son deposited at a point of the part in progress, makes it possible to take into account the dimensional variations of the mandrel in a position control system of the head 10 by the robot 70. In this example the part is made from son impregnated with a thermoplastic matrix.

Such yarns are, for example, yarns comprising carbon or glass fibers impregnated with a polyamide resin or with a poly (ether ether ketone) resin. Other pairs of fibers / resin are possible as long as the resin is a thermoplastic resin and the properties of the fibers allow, without deterioration, their temperature is increased to at least the softening / melting temperature of the resin used. The wires 50 are stored on reels of the supply system

60.

To have significant length of son without penalizing the dimensions and the mass of the head 10 which must be as reduced as possible so as not to affect its maneuverability, the coils are deported on the robot 70 or on supports attached to a booth. coils, the son being guided to the head 10, for example by pulleys.

The supply system 60 further comprises a tensioning system son to deposit provided with a scroll retrieval system.

Said thread tensioning system is of any type known to ensure a substantially constant tension force of the son 50 until the deposit of said son on the mandrel, that is to say up to the compacting roller.

Advantageously, said system also comprises a system for refacing the wires so that a reduction in the length of the path of said wires, for example by a retreat of the compacting wheel during the rotation of the mandrel, is compensated without affecting the force. of tension exerted on the son.

The traction exerted on the yarns during deposition influences the quality of compaction and the way in which the composite material obtained by the juxtaposition of the yarns and the superposition of the yarn layers is consolidated.

The tension of the son is advantageously between 20N and 50N, tests for determining a preferred value of the voltage depending on the type of son used.

In one embodiment, several threads are supplied to the head 10. The various threads 50 are then positioned at the head to form a web. The positioning of the ply yarns is carried out in a known manner by guiding elements, for example pulleys, and a terminal comb, placed closer to the compacting roller 12, which delivers the yarns juxtaposed to each other without play or overlap. between neighboring wires when the wires have been deposited. The path followed by the yarn or yarns continues on the cylindrical outer surface of the compacting roller 12 to the support line where the said yarn (s) separate from the compacting roller and are deposited on the mandrel under the effect of the relative displacement of the head 10 relative to said mandrel.

The compaction roller 12 exerts a pressing force on the predefined mandrel, in the head 10 described defined by the characteristics of the pneumatic cylinder 21 and the pressure of a gas held in said cylinder.

This force determines a pressure which is exerted on the son or son being deposited by the head and which, except for a first layer, are deposited on the layers of son already deposited on the mandrel so as to ensure a compacting of the layers of successive sons.

During the relative movement between the head 10 and the mandrel, the compacting roller 12 in contact with the mandrel rolls on the latter.

To enable this rolling without significant slip, the axis of rotation of the compacting roller is maintained perpendicular to the path followed by the head on the mandrel. The compaction roll having, by construction, a fixed orientation in a reference frame of the head, the robot 70 provides said desired orientation of the compacting roller by a suitable positioning of the head.

In one embodiment, the pressing force on the mandrel is adjustable according to the local conditions of the surface on which the threads are deposited, for example the local curvature (s) of the surface, for example the number of layers on which are deposited the threads ...

Before reaching the level of the compaction roller, the son or wires are subjected to the effect of the first heat generator 13, here an infrared ramp, of the first heating system. The infrared ramp produces a relatively diffuse radiation which ensures a homogeneous heating of the wires. The power of said infrared ramp is adapted according to a part of the running speed of the son, in practice the winding speed in the example described, and the temperature at which it is desired to wear the son before the roll of compaction. This temperature is a function of the softening / melting temperature at which the thermoplastic resin of the yarns must be worn. to obtain during compaction the consolidation of the composite material. This temperature is a temperature, as much as possible constant and in this case controlled by a temperature controller, between room temperature and the degradation temperature of the resin.

In one form of implementation, the power of the first heat generator 13 is regulated according to measured parameters such as the temperature of the son.

By thus preheating the wires before the compaction roller, on the one hand the wire proves less rigid to approach a winding phase of the son on the compacting roller and on the other hand the energy necessary to bring the temperature of the wire at the dispense temperature is reduced and better defined.

During the rotation of the mandrel, the surface of the mandrel close to the compaction roller 12, located downstream of the nip, passes into a radiation field of the heat generator 16a downstream AV of the compacting roller 12. The wires already deposited on the mandrel, for example during a previous passage of the head 10, are then preheated, at least for the surface son directly subjected to the radiation of said heat generator, preferably an infrared ramp.

Thus, when, because of the rotation of the mandrel 80, the son already deposited on said mandrel arrive at the level of the nip, said already deposited wires have a temperature close to the temperature of the wires 50 arriving on the compaction roller 12 for to be deposited on said already deposited wires.

The wires 50 to be deposited and the already deposited wires are at the line of contact, where the first are deposited on the second, then subjected to heating at the softening / melting temperature by the second heat generator 14, a Laser source, the first heating system.

Said second generator makes it possible to provide a relatively high energy in a localized manner, very close to the contact line, so that the desired softening / melting temperature is reached very locally and precisely in the zone where the pressure is exerted by the roller compaction s to apply the son 50 being deposited on the already deposited son. It is thus avoided to excessively heat areas that do not need to be heated and for which the temperatures reached that may exceed 300 ° C would be likely to cause these damages.

Furthermore, in the zone of the nip, the blast nozzle 17a sends a heated inert gas, for example nitrogen, from the downstream AV of the compaction roller 12 towards the nip, so that the hottest zone is maintained in a substantially inert atmosphere and avoids high temperature oxidation of the materials.

The heating of the blown gas contributes to the local heating of the son and especially avoids cooling of the preheated son to a stage where it is desired to increase the temperature of said son.

In contrast, on the upstream side AM of the nip, the blast nozzle 17b blows the fresh inert gas, if not cooled, from the upstream AM of the compaction roller 12 and towards said compacting roller. This blowing has the effect on the one hand of cooling said compaction roller which is subjected throughout the operating time of the head 10 to the energy supply of the second heat generator 14 and on the other hand to maintain the inert atmosphere in the area where the wires are laid.

As a result of the rotation of the mandrel, the wires that have just been deposited by the head 10 and those on which said wires have just been deposited are exposed to the radiation of the heat generator 16b upstream AM of the compaction roller 12 and to near the line of contact.

It is thus avoided a too fast cooling of the son and the resin and it is obtained a post consolidation, the resulting composite material presenting an improved material health.

During the rotation of the mandrel and the movements of the head 12 printed by the robot 70, the pressing force of the compacting roller is maintained at the desired level by the pneumatic cylinder or cylinders 21. The robot is controlled to continuously adjust an orientation of the longitudinal axis (22) of the head substantially perpendicular to an osculator plane of the mandrel at the line of contact and to maintain a distance between the plate 1 1 of the head and the chuck compatible with a range of action of the at least one jack which regulates the support force.

The depositing head of the invention has the advantage of grouping all the means necessary for compacting and in-situ consolidation of the thermoplastic composite material during the deposition of the son and to move the bulky elements of the system out of the zone. where the deposit is made.

This results in a compact head in which the envelope dimensions of the head are reduced.

The head illustrated in Figure 2 shows an embodiment whose dimensions allow the realization, on a mandrel, a tank with a diameter as small as 300 mm, with hemispherical bottoms with axial holes of 85 mm, and with minimum winding angles of 19 ° to the axis.

Claims

R E V E N D I C A T IO N S

- Head (10) for depositing son (50) impregnated with a thermoplastic resin comprising a first heating system of the son to be deposited, a second heating system arranged to heat a downstream zone (AV) on which the head (10). must deposit the wires (50) and a compaction roller (12) intended to apply a bearing force on the wires (50) during a deposit on a form (80), characterized in that:

the compaction roller (12) is movable along a longitudinal axis (22) of the head, an orientation of an axis of rotation (15) of said compaction roller, perpendicular to the longitudinal axis (22) of the head, being fixed in a reference frame of said head;

- The first heating system of the son to be deposited comprises a first heat generator (13) arranged on the head (10) to raise the temperature of the son (50), before their removal, to a value between room temperature and the application temperature and comprises a second heat generator (14) comprising at least one laser source as a heating energy source arranged on the head (10) to supply the heating energy substantially at the level of the line of contact;

- An inert gas blowing system is arranged on the head so as to render inert the environment of the son near the contact line, said blowing system comprising at least one blowing nozzle. - Head according to claim 1 wherein the compacting roller (12), the first heat generator (13) and the second heat generator (14) of the first heating system are fixed on a support (20) rigid, said rigid support being movable in translation in the direction of the longitudinal axis (22) of the head. 3 - head according to claim 2 wherein the rigid support (20) is movable in translation through at least one pneumatic cylinder (21) bearing on a gripping plate (1 1) of said head. 4 - Head according to claim 2 or claim 3 wherein one or more blowing nozzles are fixed to the rigid support (20).

5 - Head according to one of the preceding claims wherein at least one blowing nozzle (17a) is arranged to blow a heated inert gas in a downstream zone (AV) of the nip, that is, that is to say, given the relative displacement of the head (10) relative to a part in the process of producing a zone of the shape (80) or the part on which wires (50) will be deposited. 6 - Head according to one of the preceding claims wherein at least one blowing nozzle (17b) is arranged so as to blow an inert gas on the compaction roller (12) in an area of said upstream compaction roller (AM ) of the contact line. 7 - Head according to one of the preceding claims wherein the second heating system comprises at least one heat generator (16a) such as an infrared radiation emission ramp arranged on the head to heat the downstream zone (AV) . 8 - Head according to one of the preceding claims wherein the second heating system further comprises at least one heat generator (16b), such as an infrared radiation emission ramp, arranged to heat an upstream zone (AM ) corresponding to a zone with respect to the line of contact on which the wires (50) have been deposited when a part is in progress. 9 - Head according to one of the preceding claims comprising juxtaposing means of several son (50) so as to form a sheet without overlap between neighboring son, said means being arranged to form the web before the passage of son (50). ) on the compacting roller (12).

- System (100) for producing parts made of composite material by depositing son (50) impregnated with a thermoplastic resin having a shape (80), such as a mold or a winding mandrel, on which must be deposited the son (50), comprising a head (10) according to one of the preceding claims and comprising a system of supply (60) son impregnated with a thermoplastic resin to said head.

1 1 - System according to claim 10 wherein the head (10) is carried by a robot (70) which provides the desired movements of said head, said robot having axes of displacement, in translation and or in rotation, controlled from said head for:

- maintain the longitudinal axis (22) of said head substantially perpendicular to an osculating plane of a surface of the form (80), mold or winding mandrel, or part being produced at the location of the line of contact ;

- maintain a reference point of a gripping plate (1 1) of the head (10) at a substantially constant distance from the surface of the form (80) or the part being produced at the location of the contact line;

- Orienting an axis of rotation (15) of the compacting roller (12) according to a desired direction of removal for the son (50) to ensure a rolling of said compaction roller without significant slip. 12 - System according to claim 10 or claim 1 1 wherein the delivery system (60) of son impregnated with thermoplastic resins comprises a tensioning system of the son (50) to be deposited provided with a catch-up scroll. - System according to claim 12 wherein the tensioning system of the son to be deposited ensures, at the compacting roller (12) upstream of the nip following the direction of movement of the son, a tension son (50). ) substantially constant between 20N and 50N.