EP3352977A1 - Method for the production of metal parts reinforced with continuous thermoplastic fibres - Google Patents

Method for the production of metal parts reinforced with continuous thermoplastic fibres

Info

Publication number
EP3352977A1
EP3352977A1 EP16784222.8A EP16784222A EP3352977A1 EP 3352977 A1 EP3352977 A1 EP 3352977A1 EP 16784222 A EP16784222 A EP 16784222A EP 3352977 A1 EP3352977 A1 EP 3352977A1
Authority
EP
European Patent Office
Prior art keywords
fibers
metal part
draping
heating
adhesion layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16784222.8A
Other languages
German (de)
French (fr)
Inventor
Alexander Hamlyn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coriolis Group
Original Assignee
Coriolis Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coriolis Group filed Critical Coriolis Group
Publication of EP3352977A1 publication Critical patent/EP3352977A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
    • B29C70/386—Automated tape laying [ATL]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/14—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/12—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by the relative arrangement of fibres or filaments of different layers, e.g. the fibres or filaments being parallel or perpendicular to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Definitions

  • the present invention relates to a method for producing a reinforced part, more particularly to a process for producing metal parts reinforced with continuous fibers.
  • the metal part is conventionally obtained from a flat metal sheet, optionally embossed to the desired shape.
  • Each reinforcement is formed of fibers and a polymer matrix, in particular thermoplastic.
  • the reinforcement may be manufactured by applying to a mold pre-impregnated or non-resinous fibers, in the form of fabric or in the form of unidirectional layers or wicks. After application of the fibers, the preform obtained is subjected to a consolidation or hardening operation, with a possible prior infusion or polymer injection operation. After completion of the reinforcements to the desired shape, they are assembled on the metal part, for example by gluing or and / or riveting.
  • the object of the present invention is to propose a solution to overcome the aforementioned drawbacks.
  • the present invention proposes a method for producing a reinforced part, characterized in that it comprises the draping of unidirectional continuous fibers on a metal part provided with an adhesion layer comprising at least a first thermoplastic polymer said fibers being pre-impregnated with at least a second thermoplastic polymer, said draping being carried out by automatically placing the pre-impregnated fibers on the metal part, by means of a compacting roll and by heating the pre-impregnated continuous fibers to drape and the adhesion layer of the metal part, preferably just upstream of the roll, at a temperature at least greater than or equal to the melting temperature of the second polymer, for welding the pre-impregnated fibers to the metal part to obtain a reinforced part, said prepreg fibers being preferably draped in the direction or directions of the main stresses of the reinforced part to which said part will be subjected.
  • the reinforced piece is obtained by draping directly by placing fibers of the continuous fibers on a metal part which has been previously covered with an adhesion layer formed from a thermoplastic polymer.
  • the metal part has been subjected to a surface treatment by application of an adhesion layer, also called adhesion promoter layer or thermoplastic layer, this adhesion layer making it possible to ensure a satisfactory connection between the continuous fibers and metal part during draping, especially at high draping speeds.
  • the invention uses the so-called fiber placement method, known per se, in which continuous fibers are deposited in contact on a tool to form one or more plies in defined orientations.
  • This method of application to the contact is implemented by means of a fiber application head comprising a compacting roller intended to come into contact with the metal part to apply a strip formed of one or more fibers.
  • the compaction roller presses the fiber web against the tooling to facilitate adhesion of the deposited strips to the metal part and adhesion of the strips deposited therebetween, as well as to progressively evacuate the air trapped between the metal part and the tapes deposited, then between the deposited tapes.
  • the head is equipped with a heating system for heating the fiber web, as well as for heating the metal part, in particular the adhesion layer, or strips already applied, just before compacting the web.
  • the unidirectional continuous fibers applied by fiber placement are, for example, carbon fibers, glass fibers or synthetic fibers. These unidirectional continuous fibers are preferably in the form of flat fibers or wicks, e.g. one-eighth of an inch, one-quarter inch or one-half inch (1/8 ", 1/4" or 1/2 ")
  • the fibers continuous prepregs of a thermoplastic polymer have before draping a porosity less than or equal to 3%, preferably less than or equal to 2%, more preferably less than or equal to 1%.
  • the metal part provided with an adhesion layer is for example obtained from a metal sheet, partially or completely covered on one side with an adhesion layer.
  • the metal part is for example obtained from a flat sheet, possibly embossed to the desired final shape.
  • the metal part provided with an adhesion layer is obtained by projection on the metal part, at least on the areas of the metal part on which the fibers will be draped, with a bonding agent formed the first thermoplastic polymer in powder form, said metal part being then subjected to heating by passage in an oven, to form the adhesion layer.
  • the metal part provided with an adhesion layer is obtained by spraying the metal part, at least on the areas of the metal part on which the fibers will be draped, with a bonding agent formed of the first thermoplastic polymer in the solvent phase.
  • the first thermoplastic polymer and the second thermoplastic polymer are for example selected from the group consisting of polyamides, polyesters such as polyethylene terephthalate, polyethersulfones, polyetheretherketones, phenylene polysulfides, polyurethanes, epoxides, polyolefins, polylactic acid, or a mixture of one or more of these polymers.
  • the first polymer and the second polymer may be the same or different, polymers of the same family of thermoplastics or different families.
  • said heating is carried out at a temperature greater than or equal to the melting temperature of the first polymer to ensure effective welding between the metal part and the continuous fibers.
  • said heating is carried out at a temperature greater than or equal to the processability temperatures of the first polymer and the second polymer, to which said polymers are conventionally used.
  • said draping comprises the automated placement of continuous pre-impregnated fibers on pre-draped continuous fibers, by means of a compacting roll and by heating the pre-impregnated fibers to be draped and fibers previously draped to a higher than the melting temperature of the second polymer, said draping being carried out in overlap in the same direction as the previously draped fibers, and / or in complementary directions.
  • said heating during draping is performed to ensure in situ consolidation of the reinforcement, formed of continuous fibers and the second polymer, on the metal part, so that the reinforced part obtained after draping does not require additional heat treatment operation to achieve the desired mechanical characteristics, the reinforcement formed of the continuous fibers and its second polymer matrix having after draping a porosity less than or equal to 3%, preferably less than or equal to 2%, better still lower or
  • the method comprises continuous heating during the lay-up of continuous fibers for continuously welding the fibers pre-impregnated to the metal part over their entire length.
  • the method comprises discontinuous heating during lay-up of continuous fibers to weld the fibers to the metal part on fiber portions spaced apart from one another, the method may include draping fibers with batch heating and draping fibers with discontinuous heating.
  • the heating is performed by a laser-type heating means.
  • the method comprises draping overlapping fibers, in complementary directions, at one or more assembly areas of the reinforced part, in order to take up the forces transmitted by assembly means.
  • the method comprises draping pre-impregnated fibers around one or more assembly areas of the reinforced part, in order to take up the forces transmitted by the assembly means.
  • the fiber is draped around at least one assembly axis, in particular on a surface of the metal part substantially parallel to the assembly axis, and extends in a direction opposite to said assembly axis.
  • axis for example substantially perpendicular to said axis.
  • the metal part is provided with one or more flats at which the fibers are draped.
  • specific planar zones such as flats, are provided in order to facilitate the lay-up of fibers by placement of fibers and thus allow fast draping of the fibers while guaranteeing a uniform effective compaction of the fibers on all their width.
  • the fibers draped over the metal part follow geodesic trajectories.
  • the reinforced piece constitutes a piece for a land or air vehicle, for example for a motor vehicle, such as a body post, a door frame or a seat frame.
  • FIG. 1 is a schematic perspective view of a metal part for the production of a first reinforced part according to the invention
  • FIG. 2 is a partial schematic side view of the metal part of FIG. 1 during an investment operation by means of a fiber placement head;
  • FIG. 3 is a schematic view of the metal part after placement of first fibers
  • FIG. 4 is a view similar to that of Figure 3 illustrating the reinforced part after placement of second fibers
  • - Figure 5 is a view similar to that of Figure 4 illustrating an alternative embodiment for fiber placement operations
  • FIGS. 6A and 6B are respectively a top view and an enlarged partial side view of a second reinforced part according to the invention.
  • FIGS. 7A and 7B are respectively a top view and an enlarged partial side view of a third reinforced part according to the invention.
  • FIG. 1 illustrates a metal part 1 for the production of an amount of the bodywork of a motor vehicle, disposed on each side of the vehicle between the rear door and the front door, conventionally called upright or central pillar, and designed to withstand in particular side shocks and compressive forces.
  • the upright 1 comprises a vertical central portion 11 connected at the end to a lower portion 12 and an upper portion 13 for the assembly of the upright respectively to the rocker, and the roof.
  • the central portion has a generally U-shaped variable section with a central base or wall 1a and two branches or side walls 1b, the section expands at the end with curved sidewalls for the joining of the central portion to the parts.
  • the upper portion 13 has a U-shaped section and is connected by one of its side walls 13b to the central wall 11a of the central portion.
  • the lower portion 12 has a U-shaped section, with two curved side walls 12b disposed in the extension of the side walls 11b of the central portion, and a horizontal central wall 12a disposed in the extension of the central wall 1a of the central portion.
  • the metal part has an outer main face la, and an inner main face lb.
  • this metal part 1 is provided on its outer face with an adhesion layer comprising at least a first thermoplastic polymer.
  • This metal part is then reinforced by draping continuous fibers pre-impregnated with a second thermoplastic polymer on the outer face, this draping being effected by means of a fiber placement head to stiffen the metal part with respect to the forces to which she must be able to resist.
  • a fiber placement head to stiffen the metal part with respect to the forces to which she must be able to resist.
  • only the or the areas of the outer face on which fibers will be applied are covered with a layer of adhesion.
  • FIG. 2 schematically illustrates a fiber placement head 2, known per se, for automatic draping in contact with fiber.
  • the head comprises a compacting roller 21 for applying the fiber to the contact on the metal part.
  • the head further comprises cutting means 22 for cutting the fiber at the end of the trajectory, locking means 23 arranged upstream of the cutting means with respect to the direction of advancement of the fiber to block the newly-formed fiber. cut, and rerouting means 24 arranged upstream of the cutting means, to drive the fiber, this in order to be able to stop and resume the application of the fiber at any time.
  • the head is further equipped with a heating system 25 for heating, during draping, the fiber to be draped and the metallic piece adhesion layer, just upstream of the roll with respect to the direction of the head, and thus to weld the fiber to the metal piece.
  • the heating system here is of the laser type and comprises an optical 25a mounted on the head.
  • the beam emitted by a source (not shown) offset from the head is conveyed via an optical fiber 25b to the optics 25a to form a laser beam in the direction of the nip between the roll and the metal part.
  • the draping is achieved by relative movement of the head relative to the metal part. To do this, the head and / or the metal part are assembled to a displacement system.
  • first fibers 31, 32 prepreg are draped longitudinally on the central wall l ia of the central portion, the outer side thereof. These first fibers extend on the side wall 13b of the upper part, and on the central wall 12a of the lower part. These first fibers are here three in number, with a central fiber 31, and two lateral fibers 32 which end follow the curvature of the side walls 1 lb, 12b.
  • the first fibers 31, 32 are draped one by one, starting for example from the upper part.
  • the reinforced piece 4 according to the invention is obtained after draping second fibers 33, 34. These second fibers are draped over the lower and upper portions in overlap of the first fibers 31, 32. A second fiber 33 is draped on the wall lateral 13b of the upper part. Second fibers 34, three in number, are draped over the central wall 12a of the lower part in overlap of the first fibers.
  • the heating is defined to continuously weld the fibers 31-34 to the metal part, and so ensure in situ consolidation of the fibers and obtain a reinforced part that does not require an additional heat treatment step.
  • the applied fibers are 1/4 inch (1.35 mm) wide wicking carbon fibers pre-impregnated with a polyamide.
  • the metal part is covered with a layer of polyamide.
  • the preimpregnated continuous fiber and the metal part are heated to a higher temperature, for example 10 to 30 ° C, at the melting temperatures of the two polyamides used.
  • the polyamide layer is, for example, produced by electrostatically spraying the metal part with a powder-form adhesion promoter, then passing the metal part through an oven to melt the adhesion agent and form the coating layer. adhesion.
  • the adhesion promoter is in the solvent phase and is applied by spraying in the manner of a paint or a lacquer.
  • the draping operation is performed by means of a fiber placement head for drapering a strip formed of one or more fibers arranged parallel to each other, for example substantially edge to edge.
  • a fiber placement head for drapering a strip formed of one or more fibers arranged parallel to each other, for example substantially edge to edge.
  • first fibers may be draped side by side or superimposed. Fibers may also be draped to form local reinforcements at attachment areas provided for attachment of the upright to the sill and flag. These local reinforcements may be formed by superposing fibers in different orientations.
  • the adhesion agent used to form the adhesion layer is also applied to the pre-impregnated fibers, in particular on the face of the fibers intended to come into contact with the metal part.
  • the fibers previously provided with adhesion promoter, for example in the form of a powder, are then draped over the metal part provided with its adhesion layer.
  • FIG. 5 illustrates an alternative embodiment in which each fiber of the reinforced part 104 is soldered discontinuously during its layup.
  • Each draped fiber 131, 132, 133, 134 comprises an alternation of welded portions 130a and non-welded portions 130b obtained by activation or not of the heating during draping, with a welded portion at the beginning and at the end of the trajectory, the first fibers and the second fibers overlapping at welded portions.
  • Such partial welding of the fibers reduces the draping time and can be achieved when it does not reduce the mechanical properties of the reinforced part.
  • FIGS. 6A and 6B show a second reinforced part 204 according to the invention made from a metal part 201 provided with an adhesion layer comprising a first thermoplastic polymer, on which fibers have been draped, continuous fibers pre-impregnated with a second thermoplastic polymer.
  • the reinforced part 204 here constitutes a reinforcing beam intended for example to be assembled on a structural part.
  • the metal part 201 is in the form of a plate 210 of longitudinal axis A, provided on its outer face with a longitudinal boss 211, said boss forming a recess on the opposite inner face.
  • the boss has a flat upper wall 212 connected by longitudinal inclined walls 213 and transverse inclined walls 214 respectively to the flat side walls 215 and the end walls 216 planes.
  • This type of beam is intended to be assembled by each of its end walls 216 at an assembly zone shown schematically under the reference 218 in FIG. 6B.
  • the assembly is conventionally performed by drilling one or more holes in the reinforced part and placing an insert, for example a thermoplastic insert along an assembly axis B.
  • the metal part 201 is provided on its outer face 201a of an adhesion layer.
  • the metal part is for example made from a flat sheet which is subsequently stamped to the desired final shape of the reinforced part.
  • An adhesion agent for example a polyamide, is applied before or after stamping, for example by electrostatic spraying of powder, then passage in an oven.
  • First fibers 231, impregnated for example with polyamide, are draped longitudinally parallel to the axis A by placing fibers, from one end wall 216 to the other of the metal part.
  • Second continuous fibers 233 are then draped at the end walls 216 in an orientation complementary to that of the first fibers, in order to take up the forces transmitted by the first fibers and the forces transmitted by the assembly insert.
  • the second fibers 232 are draped at 90 ° of the first fibers 231.
  • a first ply of second fibers is draped at 45 ° from the first fibers, then a second ply of second fibers is draped over the first fibers. fold at -45 °.
  • first fibers are draped, for example 5 to 10 superimposed folds
  • second fibers are draped, for example 5 to 10 superimposed folds.
  • the draping on contact is carried out by heating at the contact line of the roll and the metal part at a temperature slightly higher than the melting temperature of the two polyamides.
  • FIGS. 7A and 7B illustrate a third reinforced part 304 according to the invention formed from a metal part 301 which differs from the previous one mainly in that it does not comprise plane lateral parts, the part comprising a boss 311 extending by two end walls 316, these end walls having a flange 317 with two straight portions 317a interconnected by a curved portion 317b.
  • This rim has a substantially flat outer surface, substantially perpendicular to the upper wall, substantially parallel to the assembly axis B.
  • first continuous fibers 312 are draped longitudinally parallel to the axis A 'by placing fibers from one end wall 316 to the other of the metal part, via the transverse inclined walls 314.
  • a second fiber 332 is draped over the flanges 317 of the two end walls 316 over the longitudinal inclined walls 313 and on the upper wall 312 of the boss 311, on either side of the first fibers 331.
  • the draping of this fiber begins for example on the upper wall 312, a first side of the first fibers 331, and ends in coming cover the beginning of fiber.
  • this second fiber is at least twice around the metal part, the second tower overlapping substantially in the first round.
  • This second fiber makes it possible to take up the forces transmitted by B-axis assembly inserts which will be arranged at the assembly areas 318 of the end walls, substantially parallel to the flanges.
  • Third fibers may also be draped over the end walls at these assembly areas, for example at 90 ° of the first fibers.

Abstract

The invention relates to a method for producing a reinforced part (4), comprising the draping of unidirectional continuous fibres (31-34) on a metal part (1) equipped with an adhesive layer including at least a first thermoplastic polymer, said fibres being pre-impregnated with at least a second thermoplastic polymer, said draping comprising the automated placement of pre-impregnated fibres on the metal part using a compacting roller (21) and the heating of the pre-impregnated continuous fibres to be draped and the adhesive layer of the metal part to a temperature at least greater than or equal to the melting point of the second polymer, in order to weld the pre-impregnated fibres to the metal part.

Description

PROCÉDÉ DE RÉALISATION DE PIÈCES MÉTALLIQUES RENFORCÉES DE FIBRES THERMOPLASTIQUES CONTINUES  PROCESS FOR PRODUCING REINFORCED METAL PIECES OF CONTINUOUS THERMOPLASTIC FIBERS
La présente invention concerne un procédé de réalisation d'une pièce renforcée, plus particulièrement un procédé de réalisation de pièces métalliques renforcées de fibres continues. The present invention relates to a method for producing a reinforced part, more particularly to a process for producing metal parts reinforced with continuous fibers.
Il est connu, notamment dans le domaine automobile, de fabriquer des pièces métalliques renforcées par des renforts en fibres. La pièce métallique est classiquement obtenue à partir d'une tôle métallique plane, éventuellement estampée à la forme souhaitée. Chaque renfort est formé de fibres et d'une matrice polymère, en particulier thermoplastique. Le renfort peut être fabriqué en appliquant sur un moule des fibres pré imprégnées ou non de résine, sous forme de tissu ou sous forme de nappes ou mèches unidirectionnelles. Après application des fibres, la préforme obtenue est soumise à une opération de consolidation ou durcissement, avec au préalable une éventuelle opération d'infusion ou injection de polymère. Après réalisation des renforts à la forme souhaitée, ceux-ci sont assemblés sur la pièce métallique, par exemple par collage ou et/ou par rivetage.  It is known, particularly in the automotive field, to manufacture metal parts reinforced with fiber reinforcements. The metal part is conventionally obtained from a flat metal sheet, optionally embossed to the desired shape. Each reinforcement is formed of fibers and a polymer matrix, in particular thermoplastic. The reinforcement may be manufactured by applying to a mold pre-impregnated or non-resinous fibers, in the form of fabric or in the form of unidirectional layers or wicks. After application of the fibers, the preform obtained is subjected to a consolidation or hardening operation, with a possible prior infusion or polymer injection operation. After completion of the reinforcements to the desired shape, they are assembled on the metal part, for example by gluing or and / or riveting.
Ces diverses opérations pour la réalisation d'une pièce renforcée s'avèrent longues et fastidieuse, en particulier la réalisation des renforts ainsi que les opérations de transfert sur la pièce métallique pour leur assemblage.  These various operations for producing a reinforced part prove to be long and tedious, in particular the production of reinforcements as well as the transfer operations on the metal part for their assembly.
Le but de la présente invention est de proposer une solution visant à pallier les inconvénients précités.  The object of the present invention is to propose a solution to overcome the aforementioned drawbacks.
A cet effet, la présente invention propose un procédé de réalisation d'une pièce renforcée, caractérisé en ce qu'il comprend le drapage de fibres continues unidirectionnelles sur une pièce métallique munie d'une couche d'adhérence comprenant au moins un premier polymère thermoplastique, lesdites fibres étant pré-imprégnées d'au moins un deuxième polymère thermoplastique, ledit drapage étant réalisé par placement automatisé des fibres pré-imprégnées sur la pièce métallique, au moyen d'un rouleau de compactage et par chauffage des fibres continues pré-imprégnées à draper et de la couche d'adhérence de la pièce métallique, de préférence juste en amont du rouleau, à une température au moins supérieure ou égale à la température de fusion du deuxième polymère, afin de souder les fibres pré-imprégnées à la pièce métallique pour obtenir une pièce renforcée, lesdites fibres préimprégnées étant de préférence drapées dans la ou les directions des contraintes principales de la pièce renforcée auxquelles ladite pièce sera soumise. For this purpose, the present invention proposes a method for producing a reinforced part, characterized in that it comprises the draping of unidirectional continuous fibers on a metal part provided with an adhesion layer comprising at least a first thermoplastic polymer said fibers being pre-impregnated with at least a second thermoplastic polymer, said draping being carried out by automatically placing the pre-impregnated fibers on the metal part, by means of a compacting roll and by heating the pre-impregnated continuous fibers to drape and the adhesion layer of the metal part, preferably just upstream of the roll, at a temperature at least greater than or equal to the melting temperature of the second polymer, for welding the pre-impregnated fibers to the metal part to obtain a reinforced part, said prepreg fibers being preferably draped in the direction or directions of the main stresses of the reinforced part to which said part will be subjected.
Selon l'invention, la pièce renforcée est obtenue en drapant directement par placement de fibres des fibres continues sur une pièce métallique qui été préalablement recouverte d'une couche d'adhérence formée à partir d'un polymère thermoplastique. Selon l'invention la pièce métallique a été soumise à un traitement de surface par application d'une couche d'adhérence, appelée également couche promoteur d'adhérence ou couche thermoplastique, cette couche d'adhérence permettant d'assurer une liaison satisfaisante entre les fibres continues et pièce métallique lors du drapage, notamment à des vitesses de drapage importantes.  According to the invention, the reinforced piece is obtained by draping directly by placing fibers of the continuous fibers on a metal part which has been previously covered with an adhesion layer formed from a thermoplastic polymer. According to the invention the metal part has been subjected to a surface treatment by application of an adhesion layer, also called adhesion promoter layer or thermoplastic layer, this adhesion layer making it possible to ensure a satisfactory connection between the continuous fibers and metal part during draping, especially at high draping speeds.
L'invention utilise le procédé dit de placement de fibres, connu en soi, dans lesquels des fibres continues sont déposées au contact sur un outillage pour former un ou plusieurs plis dans des orientations définies. Ce procédé d'application au contact est mis en œuvre au moyen d'une tête d'application de fibres comportant un rouleau de compactage destiné à venir en contact contre la pièce métallique pour appliquer une bande formée d'une ou plusieurs fibres. Le rouleau de compactage presse la bande de fibres contre l'outillage afin de faciliter l'adhésion des bandes déposées à la pièce métallique et l'adhésion des bandes déposées entre elles, ainsi que pour évacuer progressivement l'air emprisonné entre la pièce métallique et les bandes déposées, puis entre les bandes déposées. La tête est équipée d'un système de chauffage pour chauffer la bande de fibres, ainsi que pour chauffer la pièce métallique, en particulier la couche d'adhérence, ou des bandes déjà appliquées, juste avant le compactage de la bande.  The invention uses the so-called fiber placement method, known per se, in which continuous fibers are deposited in contact on a tool to form one or more plies in defined orientations. This method of application to the contact is implemented by means of a fiber application head comprising a compacting roller intended to come into contact with the metal part to apply a strip formed of one or more fibers. The compaction roller presses the fiber web against the tooling to facilitate adhesion of the deposited strips to the metal part and adhesion of the strips deposited therebetween, as well as to progressively evacuate the air trapped between the metal part and the tapes deposited, then between the deposited tapes. The head is equipped with a heating system for heating the fiber web, as well as for heating the metal part, in particular the adhesion layer, or strips already applied, just before compacting the web.
Les fibres continues unidirectionnelles appliquées par placement de fibres sont par exemple des fibres de carbone, des fibres de verre ou des fibres synthétiques. Lesdites fibres continues unidirectionnelles se présentent de préférence sous la forme de fibres plates ou mèches, par exemple d'un huitième de pouce, un quart de pouce ou un demi-pouce (1/8", 1/4" ou 1/2") de large. Selon un mode de réalisation les fibres continues pré-imprégnées d'un polymère thermoplastique présentent avant drapage une porosité inférieure ou égale à 3%, de préférence inférieure ou égale à 2%, mieux encore inférieure ou égale à 1%. The unidirectional continuous fibers applied by fiber placement are, for example, carbon fibers, glass fibers or synthetic fibers. These unidirectional continuous fibers are preferably in the form of flat fibers or wicks, e.g. one-eighth of an inch, one-quarter inch or one-half inch (1/8 ", 1/4" or 1/2 ") According to one embodiment, the fibers continuous prepregs of a thermoplastic polymer have before draping a porosity less than or equal to 3%, preferably less than or equal to 2%, more preferably less than or equal to 1%.
Le drapage et le soudage des fibres directement sur la pièce métallique permettent de proposer un procédé de réalisation de pièces renforcés qui est rapide et simple à mettre en œuvre.  The draping and welding of the fibers directly on the metal part make it possible to propose a process for producing reinforced parts that is quick and easy to implement.
La pièce métallique munie d'une couche d'adhérence est par exemple obtenue à partir d'une tôle métallique, recouverte partiellement ou en totalité sur une face d'une couche d'adhérence. La pièce métallique est par exemple obtenue à partir d'une tôle plane, éventuellement estampée à la forme finale souhaitée.  The metal part provided with an adhesion layer is for example obtained from a metal sheet, partially or completely covered on one side with an adhesion layer. The metal part is for example obtained from a flat sheet, possibly embossed to the desired final shape.
Selon un mode de réalisation, la pièce métallique munie d'une couche d'adhérence est obtenue par projection sur la pièce métallique, au moins sur les zones de la pièce métallique sur lesquelles seront drapées les fibres, d'un agent d'adhérence formé du premier polymère thermoplastique sous forme de poudre, ladite pièce métallique étant ensuite soumise à un chauffage par passage dans un four, pour former la couche d'adhérence.  According to one embodiment, the metal part provided with an adhesion layer is obtained by projection on the metal part, at least on the areas of the metal part on which the fibers will be draped, with a bonding agent formed the first thermoplastic polymer in powder form, said metal part being then subjected to heating by passage in an oven, to form the adhesion layer.
Selon un mode de réalisation, la pièce métallique munie d'une couche d'adhérence est obtenue par pulvérisation sur la pièce métallique, au moins sur les zones de la pièce métallique sur lesquelles seront drapées les fibres, d'un agent d'adhérence formé du premier polymère thermoplastique en phase solvant.  According to one embodiment, the metal part provided with an adhesion layer is obtained by spraying the metal part, at least on the areas of the metal part on which the fibers will be draped, with a bonding agent formed of the first thermoplastic polymer in the solvent phase.
Le premier polymère thermoplastique et le second polymère thermoplastique sont par exemple choisis dans le groupe constitué par les polyamides, polyesters tel que le polyéthylène téréphtalate, polyéthersulfones, polyétheréthercétones, polysulfures de phénylène, polyuréthanes, époxydes, polyoléfines, acide polylactique, ou un mélange d'un ou plusieurs de ces polymères.  The first thermoplastic polymer and the second thermoplastic polymer are for example selected from the group consisting of polyamides, polyesters such as polyethylene terephthalate, polyethersulfones, polyetheretherketones, phenylene polysulfides, polyurethanes, epoxides, polyolefins, polylactic acid, or a mixture of one or more of these polymers.
Le premier polymère et le second polymère peuvent être identiques ou différents, des polymères de la même famille de thermoplastique ou de familles différentes.  The first polymer and the second polymer may be the same or different, polymers of the same family of thermoplastics or different families.
De préférence, ledit chauffage est effectué à une température supérieure ou égale à la température de fusion du premier polymère afin de garantir un soudage efficace entre la pièce métallique et les fibres continues. De préférence, ledit chauffage est effectué à une température supérieure ou égale aux températures de processabilité du premier polymère et du deuxième polymère, auxquelles lesdits polymères sont classiquement mis en œuvre. Preferably, said heating is carried out at a temperature greater than or equal to the melting temperature of the first polymer to ensure effective welding between the metal part and the continuous fibers. Preferably, said heating is carried out at a temperature greater than or equal to the processability temperatures of the first polymer and the second polymer, to which said polymers are conventionally used.
Selon un mode de réalisation, ledit drapage comprend le placement automatisé de fibres continues pré-imprégnées sur des fibres continues préalablement drapées, au moyen d'un rouleau de compactage et par chauffage des fibres pré-imprégnées à draper et des fibres préalablement drapées à une température supérieure à la température de fusion du deuxième polymère, ledit drapage étant effectué en recouvrement dans une même direction que les fibres préalablement drapées, et/ ou dans des directions complémentaires.  According to one embodiment, said draping comprises the automated placement of continuous pre-impregnated fibers on pre-draped continuous fibers, by means of a compacting roll and by heating the pre-impregnated fibers to be draped and fibers previously draped to a higher than the melting temperature of the second polymer, said draping being carried out in overlap in the same direction as the previously draped fibers, and / or in complementary directions.
Selon un mode de réalisation, ledit chauffage lors du drapage est effectué pour assurer une consolidation in situ du renfort, formé des fibres continues et du deuxième polymère, sur la pièce métallique, de sorte que la pièce renforcée obtenue après drapage ne nécessite pas d'opération de traitement thermique supplémentaire pour atteindre les caractéristiques mécaniques souhaitées, le renfort formé des fibres continues et de sa matrice de deuxième polymère présentant après drapage une porosité inférieure ou égale à 3%, de préférence inférieure ou égale à 2%, mieux encore inférieure ou égale à l%.Selon un mode de réalisation, le procédé comprend un chauffage continu lors du drapage de fibres continues pour souder continûment sur toute leur longueur les fibres pré-imprégnées à la pièce métallique.  According to one embodiment, said heating during draping is performed to ensure in situ consolidation of the reinforcement, formed of continuous fibers and the second polymer, on the metal part, so that the reinforced part obtained after draping does not require additional heat treatment operation to achieve the desired mechanical characteristics, the reinforcement formed of the continuous fibers and its second polymer matrix having after draping a porosity less than or equal to 3%, preferably less than or equal to 2%, better still lower or According to one embodiment, the method comprises continuous heating during the lay-up of continuous fibers for continuously welding the fibers pre-impregnated to the metal part over their entire length.
Selon un mode de réalisation, le procédé comprend un chauffage discontinu lors du drapage de fibres continues pour souder les fibres à la pièce métallique sur des portions de fibres espacées les unes des autres, le procédé pouvant comprendre le drapage de fibres avec un chauffage discontinu et le drapage de fibres avec un chauffage discontinu.  According to one embodiment, the method comprises discontinuous heating during lay-up of continuous fibers to weld the fibers to the metal part on fiber portions spaced apart from one another, the method may include draping fibers with batch heating and draping fibers with discontinuous heating.
Selon un mode de réalisation, le chauffage est réalisé par un moyen de chauffage de type laser.  According to one embodiment, the heating is performed by a laser-type heating means.
Selon un mode de réalisation, le procédé comprend le drapage de fibres en recouvrement, dans des directions complémentaires, au niveau d'une ou plusieurs zones d'assemblage de la pièce renforcée, afin de reprendre les efforts transmis par des moyens d'assemblage. Selon un mode de réalisation, le procédé comprend le drapage de fibres pré-imprégnées autour d'une ou plusieurs zones d'assemblage de la pièce renforcée, afin de reprendre les efforts transmis par les moyens d'assemblage. Pour chaque zone d'assemblage, la fibre est drapée autour d'au moins un axe d'assemblage, en particulier sur une surface de la pièce métallique sensiblement parallèle à l'axe d'assemblage, et s'étend dans une direction opposée audit axe, par exemple sensiblement perpendiculaire audit axe. According to one embodiment, the method comprises draping overlapping fibers, in complementary directions, at one or more assembly areas of the reinforced part, in order to take up the forces transmitted by assembly means. According to one embodiment, the method comprises draping pre-impregnated fibers around one or more assembly areas of the reinforced part, in order to take up the forces transmitted by the assembly means. For each assembly zone, the fiber is draped around at least one assembly axis, in particular on a surface of the metal part substantially parallel to the assembly axis, and extends in a direction opposite to said assembly axis. axis, for example substantially perpendicular to said axis.
Selon un mode de réalisation, la pièce métallique est pourvue d'un ou plusieurs méplats au niveau desquels les fibres sont drapées. Selon l'invention, au moment de la conception de la pièce métallique, on prévoit des zones spécifiques planes, telles que des méplats, afin de faciliter le drapage de fibres par placement de fibres et ainsi permettre un drapage rapide des fibres tout en garantissant un compactage efficace des fibres sur toute leur largueur. Avantageusement, les fibres drapées sur la pièce métallique suivent des trajectoires géodésiques.  According to one embodiment, the metal part is provided with one or more flats at which the fibers are draped. According to the invention, at the time of the design of the metal part, specific planar zones, such as flats, are provided in order to facilitate the lay-up of fibers by placement of fibers and thus allow fast draping of the fibers while guaranteeing a uniform effective compaction of the fibers on all their width. Advantageously, the fibers draped over the metal part follow geodesic trajectories.
Selon un mode de réalisation, la pièce renforcée constitue une pièce pour véhicule terrestre ou aérien, par exemple pour véhicule automobile, telle qu'un montant de caisse, une armature de porte ou une armature de siège.  According to one embodiment, the reinforced piece constitutes a piece for a land or air vehicle, for example for a motor vehicle, such as a body post, a door frame or a seat frame.
L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre de modes de réalisation particuliers actuellement préférés de l'invention, en référence aux dessins schématiques annexés, sur lesquels :  The invention will be better understood, and other objects, details, features and advantages will become more clearly apparent from the following detailed explanatory description of particular embodiments currently preferred of the invention, with reference to the accompanying schematic drawings, on which ones :
- la figure 1 est une vue schématique en perspective d'une pièce métallique pour la réalisation d'une première pièce renforcée selon invention ;  - Figure 1 is a schematic perspective view of a metal part for the production of a first reinforced part according to the invention;
- la figure 2 est une vue schématique partielle de côté de la pièce métallique de la figure 1 lors d'une opération de placement au moyen d'une tête de placement de fibres ;  FIG. 2 is a partial schematic side view of the metal part of FIG. 1 during an investment operation by means of a fiber placement head;
- la figure 3 est une vue schématique de la pièce métallique après placement de premières fibres ;  - Figure 3 is a schematic view of the metal part after placement of first fibers;
- la figure 4 est une vue analogue à celle de la figure 3 illustrant la pièce renforcée après placement de secondes fibres ; - la figure 5 est une vue analogue à celle de la figure 4 illustrant une variante de réalisation pour les opérations de placement de fibres ; - Figure 4 is a view similar to that of Figure 3 illustrating the reinforced part after placement of second fibers; - Figure 5 is a view similar to that of Figure 4 illustrating an alternative embodiment for fiber placement operations;
- les figures 6A et 6B sont respectivement une vue de dessus et une vue partielle agrandie de côté d'une deuxième pièce renforcée selon l'invention ; et,  - Figures 6A and 6B are respectively a top view and an enlarged partial side view of a second reinforced part according to the invention; and,
- les figures 7A et 7B sont respectivement une vue de dessus et une vue partielle agrandie de côté d'une troisième pièce renforcée selon l'invention.  - Figures 7A and 7B are respectively a top view and an enlarged partial side view of a third reinforced part according to the invention.
La figure 1 illustre une pièce métallique 1 pour la réalisation d'un montant de la caisse d'un véhicule automobile, disposé de chaque côté du véhicule entre la porte arrière et la porte avant, classiquement appelé montant ou pied milieu, et prévu pour résister notamment aux chocs latéraux et aux efforts de compression.  FIG. 1 illustrates a metal part 1 for the production of an amount of the bodywork of a motor vehicle, disposed on each side of the vehicle between the rear door and the front door, conventionally called upright or central pillar, and designed to withstand in particular side shocks and compressive forces.
Le montant 1 comprend une partie centrale 11 verticale reliée en extrémité à une partie inférieure 12 et à une partie supérieure 13 pour l'assemblage du montant respectivement au bas de caisse, et au pavillon. La partie centrale présente une section variable en forme générale de U avec une base ou paroi centrale 1 la et deux branches ou parois latérales 1 lb, la section s'agrandit en extrémité avec des parois latérales courbées pour la jonction de la partie centrale aux parties inférieure 12, et supérieure 13. La partie supérieure 13 présente une section en U et est reliée par une de ses parois latérales 13b à la paroi centrale l ia de la partie centrale. La partie inférieure 12 présente une section en U, avec deux parois latérales 12b courbées disposées dans le prolongement des parois latérales 11b de la partie centrale, et une paroi centrale 12a horizontale disposée dans le prolongement de la paroi centrale 1 la de la partie centrale. La pièce métallique présente une face principale extérieure la, et une face principale intérieure lb.Selon l'invention, cette pièce métallique 1 est munie sur sa face extérieure d'une couche d'adhérence comprenant au moins un premier polymère thermoplastique. Cette pièce métallique est ensuite renforcée par drapage de fibres continues pré-imprégnées d'un deuxième polymère thermoplastique sur la face extérieure, ce drapage étant effectué au moyen d'une tête de placement de fibres afin de rigidifier la pièce métallique par rapport aux efforts auxquels elle doit pouvoir résister. En variante uniquement la ou les zones de la face extérieure sur lesquelles seront appliquées de fibres sont recouvertes d'une couche d'adhérence. The upright 1 comprises a vertical central portion 11 connected at the end to a lower portion 12 and an upper portion 13 for the assembly of the upright respectively to the rocker, and the roof. The central portion has a generally U-shaped variable section with a central base or wall 1a and two branches or side walls 1b, the section expands at the end with curved sidewalls for the joining of the central portion to the parts. The upper portion 13 has a U-shaped section and is connected by one of its side walls 13b to the central wall 11a of the central portion. The lower portion 12 has a U-shaped section, with two curved side walls 12b disposed in the extension of the side walls 11b of the central portion, and a horizontal central wall 12a disposed in the extension of the central wall 1a of the central portion. The metal part has an outer main face la, and an inner main face lb. According to the invention, this metal part 1 is provided on its outer face with an adhesion layer comprising at least a first thermoplastic polymer. This metal part is then reinforced by draping continuous fibers pre-impregnated with a second thermoplastic polymer on the outer face, this draping being effected by means of a fiber placement head to stiffen the metal part with respect to the forces to which she must be able to resist. Alternatively only the or the areas of the outer face on which fibers will be applied are covered with a layer of adhesion.
La figure 2 illustre de manière schématique une tête 2 de placement de fibres, connue en soi, permettant le drapage automatique au contact de fibre. La tête comprend un rouleau de compactage 21 pour appliquer la fibre au contact sur la pièce métallique. La tête comprend en outre des moyens de coupe 22 pour couper la fibre en fin de trajectoire, des moyens de blocage 23 disposés en amont des moyens de coupe par rapport à la direction d'avancement de la fibre pour bloquer la fibre venant d'être coupée, et des moyens de réacheminement 24 disposés amont des moyens de coupe, pour entraîner la fibre, ceci afin de pouvoir à tout moment stopper et reprendre l'application de la fibre.  FIG. 2 schematically illustrates a fiber placement head 2, known per se, for automatic draping in contact with fiber. The head comprises a compacting roller 21 for applying the fiber to the contact on the metal part. The head further comprises cutting means 22 for cutting the fiber at the end of the trajectory, locking means 23 arranged upstream of the cutting means with respect to the direction of advancement of the fiber to block the newly-formed fiber. cut, and rerouting means 24 arranged upstream of the cutting means, to drive the fiber, this in order to be able to stop and resume the application of the fiber at any time.
La tête est en outre équipée d'un système de chauffage 25 pour chauffer lors du drapage la fibre à draper et la couche d'adhérence pièce métallique, juste en amont du rouleau par rapport à la direction de la tête, et ainsi souder la fibre à la pièce métallique. Le système de chauffage est ici de type laser et comprend une optique 25a montée sur la tête. Le faisceau émis par une source (non représentée) déportée par rapport à la tête est acheminée via une fibre optique 25b jusqu'à l'optique 25a pour former un faisceau laser en direction de la ligne de contact entre le rouleau et la pièce métallique. Le drapage est réalisé par déplacement relatif de la tête par rapport à la pièce métallique. Pour ce faire, la tête et/ou la pièce métallique sont assemblées à un système de déplacement.  The head is further equipped with a heating system 25 for heating, during draping, the fiber to be draped and the metallic piece adhesion layer, just upstream of the roll with respect to the direction of the head, and thus to weld the fiber to the metal piece. The heating system here is of the laser type and comprises an optical 25a mounted on the head. The beam emitted by a source (not shown) offset from the head is conveyed via an optical fiber 25b to the optics 25a to form a laser beam in the direction of the nip between the roll and the metal part. The draping is achieved by relative movement of the head relative to the metal part. To do this, the head and / or the metal part are assembled to a displacement system.
En référence à la figure 3, des premières fibres 31, 32 préimprégnées sont drapées longitudinalement sur la paroi centrale l ia de la partie centrale, du côté extérieur de cette dernière. Ces premières fibres se prolongent sur la paroi latérale 13b de la partie supérieure, et sur la paroi centrale 12a de la partie inférieure. Ces premières fibres sont ici au nombre de trois, avec une fibre centrale 31 , et deux fibres latérales 32 qui en extrémité suivent la courbure des parois latérales 1 lb, 12b. Les premières fibres 31, 32 sont drapées une par une, en partant par exemple de la partie supérieure.  Referring to Figure 3, first fibers 31, 32 prepreg are draped longitudinally on the central wall l ia of the central portion, the outer side thereof. These first fibers extend on the side wall 13b of the upper part, and on the central wall 12a of the lower part. These first fibers are here three in number, with a central fiber 31, and two lateral fibers 32 which end follow the curvature of the side walls 1 lb, 12b. The first fibers 31, 32 are draped one by one, starting for example from the upper part.
En référence à la figure 4, la pièce renforcée 4 selon l'invention est obtenue après drapage de secondes fibres 33, 34. Ces secondes fibres sont drapées sur les parties inférieure et supérieure en recouvrement des premières fibres 31, 32. Une seconde fibre 33 est drapée sur la paroi latérale 13b de la partie supérieure. Des secondes fibres 34, au nombre de trois, sont drapées sur la paroi centrale 12a de la partie inférieure en recouvrement des premières fibres. With reference to FIG. 4, the reinforced piece 4 according to the invention is obtained after draping second fibers 33, 34. These second fibers are draped over the lower and upper portions in overlap of the first fibers 31, 32. A second fiber 33 is draped on the wall lateral 13b of the upper part. Second fibers 34, three in number, are draped over the central wall 12a of the lower part in overlap of the first fibers.
Lors du drapage, le chauffage est défini pour souder continûment les fibres 31-34 à la pièce métallique, et de manière assurer une consolidation in situ des fibres et obtenir une pièce renforcée ne nécessitant pas d'étape de traitement thermique supplémentaire.  During draping, the heating is defined to continuously weld the fibers 31-34 to the metal part, and so ensure in situ consolidation of the fibers and obtain a reinforced part that does not require an additional heat treatment step.
A titre d'exemple, les fibres appliquées sont des fibres de carbone de type mèche de 6,35 mm (1/4 de pouce) de large, pré-imprégnées d'un polyamide. La pièce métallique est recouverte d'une couche de polyamide. La fibre continue pré-imprégnée et la pièce métallique sont chauffées à une température supérieure, par exemple de 10 à 30°C, aux températures de fusion des deux polyamides utilisés.  By way of example, the applied fibers are 1/4 inch (1.35 mm) wide wicking carbon fibers pre-impregnated with a polyamide. The metal part is covered with a layer of polyamide. The preimpregnated continuous fiber and the metal part are heated to a higher temperature, for example 10 to 30 ° C, at the melting temperatures of the two polyamides used.
La couche de polyamide est par exemple réalisée par projection électrostatique sur la pièce métallique d'un agent d'adhérence sous forme de poudre, puis passage de la pièce métallique dans un four pour fondre l'agent d'adhérence et former la couche d'adhérence. Selon un autre mode de réalisation, l'agent d'adhérence est en phase solvant et est appliqué par pulvérisation à la manière d'une peinture ou d'une laque.  The polyamide layer is, for example, produced by electrostatically spraying the metal part with a powder-form adhesion promoter, then passing the metal part through an oven to melt the adhesion agent and form the coating layer. adhesion. According to another embodiment, the adhesion promoter is in the solvent phase and is applied by spraying in the manner of a paint or a lacquer.
En variante, l'opération de drapage est réalisée au moyen d'une tête de placement de fibres permettant de draper une bande formée d'une ou plusieurs fibres disposées parallèlement entre elles, par exemple sensiblement bord à bord. Ainsi, les trois deuxièmes fibres sur la partie inférieure peuvent être drapées en une seule passe.  Alternatively, the draping operation is performed by means of a fiber placement head for drapering a strip formed of one or more fibers arranged parallel to each other, for example substantially edge to edge. Thus, the three second fibers on the lower part can be draped in one pass.
Le nombre de fibres drapées est donné ici à titre d'exemple, plusieurs premières fibres peuvent être drapées côte à · côte ou en superposition. Des fibres peuvent en outre être drapées pour former des renforts locaux au niveau de zones de fixation prévues pour la fixation du montant milieu au bas de caisse et au pavillon. Ces renforts locaux peuvent être formés par superposition de fibres dans des orientations différentes.  The number of draped fibers is given here by way of example, several first fibers may be draped side by side or superimposed. Fibers may also be draped to form local reinforcements at attachment areas provided for attachment of the upright to the sill and flag. These local reinforcements may be formed by superposing fibers in different orientations.
Selon une variante de réalisation, l'agent d'adhérence utilisé pour former la couche d'adhérence est également appliqué sur les fibres préimprégnées, en particulier sur la face des fibres destinée à venir en contact avec la pièce métallique. Les fibres préalablement munie d'agent d'adhérence, par exemple sous forme de poudre, sont ensuite drapées sur la pièce métallique munie de sa couche d'adhérence. La figure 5 illustre une variante de réalisation dans laquelle chaque fibre de la pièce renforcée 104 est soudée de manière discontinue lors de son drapage. Chaque fibre drapée 131, 132, 133, 134 comprend une alternance de portions soudées 130a et de portions non soudées 130b obtenues par activation ou non du chauffage lors du drapage, avec une portion soudée en début et en fin de trajectoire, les premières fibres et les secondes fibres se chevauchant au niveau de portions soudées. Un tel soudage partiel des fibres permet de réduire le temps de drapage et peut être réalisé lorsqu'il ne réduit pas les propriétés mécaniques de la pièce renforcée. According to an alternative embodiment, the adhesion agent used to form the adhesion layer is also applied to the pre-impregnated fibers, in particular on the face of the fibers intended to come into contact with the metal part. The fibers previously provided with adhesion promoter, for example in the form of a powder, are then draped over the metal part provided with its adhesion layer. FIG. 5 illustrates an alternative embodiment in which each fiber of the reinforced part 104 is soldered discontinuously during its layup. Each draped fiber 131, 132, 133, 134 comprises an alternation of welded portions 130a and non-welded portions 130b obtained by activation or not of the heating during draping, with a welded portion at the beginning and at the end of the trajectory, the first fibers and the second fibers overlapping at welded portions. Such partial welding of the fibers reduces the draping time and can be achieved when it does not reduce the mechanical properties of the reinforced part.
Les figures 6A et 6B représentent une deuxième pièce renforcée 204 selon l'invention réalisée à partir d'une pièce métallique 201 munie d'une couche d'adhérence comprenant un premier polymère thermoplastique, sur laquelle ont été drapées, par placement de fibres, des fibres continues pré-imprégnées d'un second polymère thermoplastique.  FIGS. 6A and 6B show a second reinforced part 204 according to the invention made from a metal part 201 provided with an adhesion layer comprising a first thermoplastic polymer, on which fibers have been draped, continuous fibers pre-impregnated with a second thermoplastic polymer.
La pièce renforcée 204 constitue ici une poutre de renfort destinée par exemple à être assemblée sur une pièce de structure. La pièce métallique 201 se présente sous la forme d'une plaque 210 d'axe longitudinal A, munie sur sa face extérieure d'un bossage longitudinal 211, ledit bossage formant un renfoncement sur la face intérieure opposée. Le bossage présente une paroi supérieure 212 plane reliée par des parois inclinées longitudinales 213 et des parois inclinées transversales 214 respectivement aux parois latérales 215 planes et aux parois d'extrémité 216 planes. Ce type de poutre est destiné être assemblée par chacune de ses parois d'extrémité 216 au niveau d'une zone d'assemblage représentée schématiquement sous la référence 218 sur la figure 6B. L'assemblage est classiquement effectué par perçage d'un ou plusieurs trous de la pièce renforcée et mise en place d'un insert, par exemple un insert thermoplastique selon un axe d'assemblage B. La pièce métallique 201 est munie sur sa face extérieure 201a d'une couche d'adhérence.  The reinforced part 204 here constitutes a reinforcing beam intended for example to be assembled on a structural part. The metal part 201 is in the form of a plate 210 of longitudinal axis A, provided on its outer face with a longitudinal boss 211, said boss forming a recess on the opposite inner face. The boss has a flat upper wall 212 connected by longitudinal inclined walls 213 and transverse inclined walls 214 respectively to the flat side walls 215 and the end walls 216 planes. This type of beam is intended to be assembled by each of its end walls 216 at an assembly zone shown schematically under the reference 218 in FIG. 6B. The assembly is conventionally performed by drilling one or more holes in the reinforced part and placing an insert, for example a thermoplastic insert along an assembly axis B. The metal part 201 is provided on its outer face 201a of an adhesion layer.
La pièce métallique est par exemple réalisée à partir d'une tôle plane qui est par la suite estampée à la forme finale souhaitée de la pièce renforcée. Un agent d'adhérence, par exemple un polyamide, est appliqué avant ou après estampage, par exemple par projection électrostatique de poudre, puis passage dans un four. The metal part is for example made from a flat sheet which is subsequently stamped to the desired final shape of the reinforced part. An adhesion agent, for example a polyamide, is applied before or after stamping, for example by electrostatic spraying of powder, then passage in an oven.
Des premières fibres 231, imprégnées par exemple de polyamide sont drapés longitudinalement parallèlement à l'axe A par placement de fibres, d'une paroi d'extrémité 216 à l'autre de la pièce métallique. Des secondes fibres 233 continues sont ensuite drapées au niveau des parois d'extrémités 216 dans une orientation complémentaire de celle des premières fibres, afin de reprendre les efforts transmis par les premières fibres et les efforts transmis par l'insert d'assemblage. Dans l'exemple illustré, les secondes fibres 232 sont drapées à 90° des premières fibres 231. En variante, un premier pli de secondes fibres est drapé à 45° des premières fibres, puis un deuxième pli de secondes fibres est drapé pardessus le premier pli à -45°. En variante, plusieurs plis superposés de premières fibres sont drapés, par exemple de 5 à 10 plis superposés, et plusieurs plis de secondes fibres sont drapés, par exemple de 5 à 10 plis superposés. Le drapage au contact est effectué en chauffant au niveau de la ligne de contact du rouleau et de la pièce métallique à une température légèrement supérieure à la température de fusion des deux polyamides.  First fibers 231, impregnated for example with polyamide, are draped longitudinally parallel to the axis A by placing fibers, from one end wall 216 to the other of the metal part. Second continuous fibers 233 are then draped at the end walls 216 in an orientation complementary to that of the first fibers, in order to take up the forces transmitted by the first fibers and the forces transmitted by the assembly insert. In the example shown, the second fibers 232 are draped at 90 ° of the first fibers 231. In a variant, a first ply of second fibers is draped at 45 ° from the first fibers, then a second ply of second fibers is draped over the first fibers. fold at -45 °. Alternatively, several superposed folds of first fibers are draped, for example 5 to 10 superimposed folds, and several folds of second fibers are draped, for example 5 to 10 superimposed folds. The draping on contact is carried out by heating at the contact line of the roll and the metal part at a temperature slightly higher than the melting temperature of the two polyamides.
Les figures 7 A et 7B illustrent une troisième pièce renforcée 304 selon l'invention formée à partir d'une pièce métallique 301 qui se différencie de la précédente principalement par le fait qu'elle ne comprend pas de parties latérales planes, la pièce comprenant un bossage 311 se prolongeant par deux parois d'extrémité 316, ces parois d'extrémité présentant un rebord 317 avec deux portions rectilignes 317a reliées entre elles par une portion courbée 317b. Ce rebord présente une surface extérieure sensiblement plane, sensiblement perpendiculaire à la paroi supérieure, sensiblement parallèle à l'axe d'assemblage B.  FIGS. 7A and 7B illustrate a third reinforced part 304 according to the invention formed from a metal part 301 which differs from the previous one mainly in that it does not comprise plane lateral parts, the part comprising a boss 311 extending by two end walls 316, these end walls having a flange 317 with two straight portions 317a interconnected by a curved portion 317b. This rim has a substantially flat outer surface, substantially perpendicular to the upper wall, substantially parallel to the assembly axis B.
Comme précédemment, des premières fibres 312 continues sont drapées longitudinalement parallèlement à l'axe A' par placement de fibres d'une paroi d'extrémité 316 à l'autre de la pièce métallique, en passant par les parois inclinées transversales 314. Une seconde fibre 332 est drapée sur les rebords 317 des deux parois d'extrémité 316 en passant sur les parois inclinées longitudinales 313 et sur la paroi supérieure 312 plane du bossage 311, de part et d'autre des premières fibres 331. Le drapage de cette fibre commence par exemple sur la paroi supérieure 312, d'un premier côté des premières fibres 331 , et se termine en venant recouvrir le début de fibre. En variante, cette deuxième fibre fait au moins deux fois le tour de la pièce métallique, le deuxième tour se superposant sensiblement au premier tour. Cette deuxième fibre permet de reprendre les efforts transmis par des inserts d'assemblage d'axe B' qui seront disposés au niveau des zones d'assemblage 318 des parois d'extrémité, sensiblement parallèlement aux rebords. Des troisièmes fibres peuvent en outre être drapées sur les parois d'extrémités au niveau de ces zones d'assemblage, par exemple à 90° des premières fibres. As previously, first continuous fibers 312 are draped longitudinally parallel to the axis A 'by placing fibers from one end wall 316 to the other of the metal part, via the transverse inclined walls 314. A second fiber 332 is draped over the flanges 317 of the two end walls 316 over the longitudinal inclined walls 313 and on the upper wall 312 of the boss 311, on either side of the first fibers 331. The draping of this fiber begins for example on the upper wall 312, a first side of the first fibers 331, and ends in coming cover the beginning of fiber. Alternatively, this second fiber is at least twice around the metal part, the second tower overlapping substantially in the first round. This second fiber makes it possible to take up the forces transmitted by B-axis assembly inserts which will be arranged at the assembly areas 318 of the end walls, substantially parallel to the flanges. Third fibers may also be draped over the end walls at these assembly areas, for example at 90 ° of the first fibers.
Bien que l'invention ait été décrite en liaison avec différents modes de réalisation particuliers, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.  Although the invention has been described in connection with various particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

Claims

REVENDICATIONS
1. Procédé de réalisation d'une pièce renforcée (4, 104, 204, 304), caractérisé en ce qu'il comprend le drapage de fibres continues unidirectionnelles (31-34 ; 131-134 ; 231, 232 ; 331, 332) sur une pièce métallique (1 , 201 , 301) munie d'une couche d'adhérence comprenant au moins un premier polymère thermoplastique, lesdites fibres étant préimprégnées d'au moins un deuxième polymère thermoplastique, ledit drapage étant réalisé par placement automatisé des fibres pré-imprégnées sur la pièce métallique, au moyen d'un rouleau de compactage (21) et par chauffage des fibres continues pré-imprégnées à draper et la couche d'adhérence de la pièce métallique, à une température au moins supérieure ou égale à la température de fusion du deuxième polymère, afin de souder les fibres pré-imprégnées à la pièce métallique.  1. A method of producing a reinforced part (4, 104, 204, 304), characterized in that it comprises the draping of unidirectional continuous fibers (31-34; 131-134; 231, 232; 331, 332). on a metal part (1, 201, 301) provided with an adhesion layer comprising at least a first thermoplastic polymer, said fibers being pre-impregnated with at least one second thermoplastic polymer, said draping being carried out by automated placement of the pre-fibers impregnated on the metal part, by means of a compaction roller (21) and by heating the continuous preimpregnated fibers to be draped and the adhesion layer of the metal part, to a temperature at least greater than or equal to melting temperature of the second polymer, in order to weld the pre-impregnated fibers to the metal part.
2. Procédé selon la revendication 1, caractérisé en ce que ledit chauffage est effectué à une température supérieure ou égale à la température de fusion du premier polymère.  2. Method according to claim 1, characterized in that said heating is performed at a temperature greater than or equal to the melting temperature of the first polymer.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que ledit drapage comprend le placement automatisé de fibres continues sur des fibres continues préalablement drapées.  3. Method according to claim 1 or 2, characterized in that said draping comprises the automated placement of continuous fibers on continuous fibers previously draped.
4. Procédé selon l'une des revendications 1 à 3, caractérisée en ce que ledit chauffage lors du drapage est effectué pour assurer une consolidation in situ du renfort, formé des fibres continues et du deuxième polymère, sur la pièce métallique.  4. Method according to one of claims 1 to 3, characterized in that said heating during draping is performed to provide in situ consolidation of the reinforcement, formed of continuous fibers and the second polymer, on the metal part.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'il comprend un chauffage continu lors du drapage de fibres pour souder continûment sur toute leur longueur les fibres continues à la pièce métallique.  5. Method according to one of claims 1 to 4, characterized in that it comprises a continuous heating during the draping of fibers to continuously weld over their entire length the continuous fibers to the metal part.
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'il comprend un chauffage discontinu lors du drapage des fibres continues pour souder les fibres continues à la pièce métallique sur des portions (130a) de fibres espacées les unes des autres.  6. Method according to one of claims 1 to 5, characterized in that it comprises a discontinuous heating during the lay-up of the continuous fibers for welding the continuous fibers to the metal part on portions (130a) of fibers spaced from each other. other.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le chauffage est réalisé par un moyen de chauffage (25) de type laser.  7. Method according to one of claims 1 to 6, characterized in that the heating is performed by a heating means (25) of the laser type.
8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'il comprend le drapage de fibres en recouvrement, dans des directions complémentaires, au niveau d'une ou plusieurs zones d'assemblage (208, 308) de la pièce renforcée. 8. Method according to one of claims 1 to 7, characterized in that it comprises the layup of fibers in recovery, in directions complementary, at one or more assembly areas (208, 308) of the reinforced part.
9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'il comprend le drapage de fibres pré-imprégnées (332) autour d'une ou plusieurs zones d'assemblage (308) de la pièce renforcée.  9. Method according to one of claims 1 to 8, characterized in that it comprises draping pre-impregnated fibers (332) around one or more assembly areas (308) of the reinforced part.
10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la pièce métallique (301) est pourvue d'un ou plusieurs méplats (317) au niveau desquels les fibres sont drapées.  10. Method according to one of claims 1 to 9, characterized in that the metal part (301) is provided with one or more flats (317) at which the fibers are draped.
1 1. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la pièce métallique (1, 201, 301) munie d'une couche d'adhérence est obtenue à partir d'une tôle métallique, recouverte partiellement ou en totalité sur une face d'une couche d'adhérence.  1 1. Method according to one of claims 1 to 10, characterized in that the metal part (1, 201, 301) provided with an adhesion layer is obtained from a metal sheet, partially covered or in all on one side of an adhesion layer.
12. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la pièce métallique (1, 201 , 301) munie d'une couche d'adhérence est obtenue par projection sur la pièce métallique d'un agent d'adhérence formé du premier polymère thermoplastique sous forme de poudre, ladite pièce métallique étant ensuite soumise à un chauffage par passage dans un four, pour former la couche d'adhérence.  12. Method according to one of claims 1 to 10, characterized in that the metal part (1, 201, 301) provided with an adhesion layer is obtained by projection on the metal part of a bonding agent formed of the first thermoplastic polymer in powder form, said metal part being then subjected to heating by passage in an oven, to form the adhesion layer.
13. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la pièce métallique (1, 201, 301) munie d'une couche d'adhérence est obtenue par pulvérisation sur la pièce métallique, d'un agent d'adhérence formé du premier polymère thermoplastique en phase solvant.  13. Method according to one of claims 1 to 10, characterized in that the metal part (1, 201, 301) provided with an adhesion layer is obtained by spraying on the metal part, an agent of adhesion formed of the first thermoplastic polymer in the solvent phase.
EP16784222.8A 2015-09-25 2016-09-16 Method for the production of metal parts reinforced with continuous thermoplastic fibres Withdrawn EP3352977A1 (en)

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