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EP1738005B1 - Procede pour fabriquer des produits semi-finis composites renforces par des fibres au moyen d'une technique de tressage rond - Google Patents

Procede pour fabriquer des produits semi-finis composites renforces par des fibres au moyen d'une technique de tressage rond Download PDF

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Publication number
EP1738005B1
EP1738005B1 EP05733313A EP05733313A EP1738005B1 EP 1738005 B1 EP1738005 B1 EP 1738005B1 EP 05733313 A EP05733313 A EP 05733313A EP 05733313 A EP05733313 A EP 05733313A EP 1738005 B1 EP1738005 B1 EP 1738005B1
Authority
EP
European Patent Office
Prior art keywords
threads
braiding
partially
braided
supporting
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.)
Expired - Lifetime
Application number
EP05733313A
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German (de)
English (en)
Other versions
EP1738005A1 (fr
Inventor
Andreas Gessler
Franz Maidl
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.)
Airbus Defence and Space GmbH
Original Assignee
EADS Deutschland GmbH
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 EADS Deutschland GmbH filed Critical EADS Deutschland GmbH
Publication of EP1738005A1 publication Critical patent/EP1738005A1/fr
Application granted granted Critical
Publication of EP1738005B1 publication Critical patent/EP1738005B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Definitions

  • the present invention relates to a method for producing fiber composite semifinished products by means of circular braiding according to the preamble of patent claim 1.
  • a fiber composite semi-finished produced according to the invention is specified in claim 8.
  • the known methods have the disadvantage that the braiding fibers are damaged and weakened by the shearing forces acting on them during braiding or by friction at corresponding crossover points, which is achieved, for example, by a braiding machine with two braiding rings (FIG. DE-C-101 15 935 ) can be reduced.
  • a braiding machine with two braiding rings FIG. DE-C-101 15 935
  • EP 0 628 401 A1 is a method for producing a product, in particular a sports device made of fiber-reinforced thermoplastic resin known, and a corresponding component in which matrix-forming fibers and reinforcing fibers are interwoven or intertwined.
  • the present invention has for its object to provide a method for producing braided fiber composite semi-finished products, in which the fiber damage is reduced and such semi-finished products can be produced with significantly reduced fiber waviness and improved material properties.
  • the invention is based on the round braiding technique in which a braided core is braided with braiding threads which are unwound by means of clutches rotating concentrically around the braid core in different directions characterized in that the clapper one circumferential direction with reinforcing threads and the clapper of the opposite direction of rotation are at least partially equipped with support threads, wherein the support threads are at least partially made of thermoplastic threads.
  • thermoplastic threads which are known to consist of plastics (polyamides, polystyrenes, polyethylenes, polyesters, etc.) and melt when heated above the softening point, can be thermoformed and solidify again after cooling and also have good sliding properties, the friction of the first weaving crosses braids reduced during braiding, since the reinforcing threads slide on the thermoplastic threads friction reduced. This results in a significant reduction of the fiber damage and consequently an improvement in the material properties of the braid result.
  • plastics polyamides, polystyrenes, polyethylenes, polyesters, etc.
  • the support threads which consist at least partially of thelmoplastic threads, hold the reinforcing threads deposited on the fiber core in position, so that at the same time the flexibility of the braiding process with respect to the braided core geometry is ensured.
  • the elastic thermoplastic threads nestle so tightly between the reinforcing threads that they come to lie practically without any gap in parallel and are thus stored almost free of waves. Due to the associated reduced fiber waviness, the positive properties of the reinforcing threads can be optimally utilized, so that the material properties of fiber composite semifinished products produced according to the invention are greatly improved.
  • the braided core is braided several times in succession, each unidirectional reinforcing fiber individual layers are deposited on the braid core.
  • the term "unidirectional" expresses the fact that it is level, not wavy individual layers.
  • This in turn has the advantage that the predictability of the fiber structure produced according to the invention Braids is improved because the mathematical models for unidirectional scrim are applicable.
  • a further advantage consists in that, in the case of a layered braiding of the braided core, before laying down a further single layer, the previously deposited single layer can be fixed by melting the thermoplastic threads. This prevents slipping or shifting in a simple and effective manner.
  • the melting can be carried out for example by local heating or by applying a vacuum tube with subsequent heating. In the latter method, the stored individual layer is compacted accordingly, which further reduces the waviness of the braid.
  • an asymmetric bobbin occupation is possible in which the number of rotating in one direction clapper is not equal to the number of rotating in opposite directions clapper, which ensures a high degree of variation. If, for example, three quarters of the bobbins revolving in one direction with reinforcing threads and one quarter of the bobbins revolving in the opposite direction, with thermoplastic threads, the one and a half times the number of reinforcing threads can be processed in a single layer, so that a 50% increased stacking width is achieved. The achievable core circumference increases to the same extent. This has the advantage that correspondingly smaller and therefore cheaper machines can be used.
  • the reinforcing threads of carbon, glass, aramid and / or Kevlar fibers which are characterized by high tensile and compressive stiffness and high tensile and compressive strength.
  • the support threads dissolve completely or at least partially at temperatures at which the mesh is usually infiltrated.
  • the supporting threads completely or at least partially of Grilon ® filaments or other thermoplastic threads with melting temperatures in the range of infiltration temperature.
  • the support threads may also consist of materials that are only partially melting,
  • Fiber composite semifinished products braided in accordance with the invention are characterized in that they consist of a multiplicity of unidirectional individual layers deposited in layers, wherein each individual layer has interlaced support threads which at least partially consist of thermoplastic threads. It is advantageous that can be addressed by suitable choice of support threads in a simple way to special requirements, so that the support threads are dissolved in the infiltrated mesh either completely or partially.
  • bobbins ie bobbin holders which receive bobbin wefts
  • guideways are two counter-rotating concentric orbits around a braiding core to be braided.
  • the Braiding threads of the clapper rotate in the positive direction of rotation with those of the negative direction of rotation, so that when braiding a three-dimensional braid core, a braid is formed.
  • Fig. 1 shows a simplified representation in side view of the thread guide in the method according to the invention.
  • a robot moves relative to the fixed braiding machine body 2 in the direction of the movement arrow 3, wherein the braided threads 4a, 4b unwind from the bobbins 5a and 5b and after a deflection are deposited on the braiding core 1 on the braiding ring 6 via corresponding crossover at the braiding points.
  • the clappers 5a and 5b have different directions of rotation around the fiber core 1. For reasons of simplified drawing are in Fig. 1 only two of the many other braiding threads 4a, 4b and clapper 5a, 5b shown.
  • the claw 5a are equipped with reinforcing threads 4a made of carbon, glass, aramid and / or Kevlar fibers, and the circulating in opposite direction clapper 5b are with supporting threads 4b, at least partially made of thermoplastic threads (eg Grilon ® - or Polyester threads) consist, equipped.
  • the reinforcing threads 4a shown in solid lines, and the supporting threads 4b are shown in dashed lines.
  • the reinforcing threads 4a are stored wave-free, where they by the support threads 4b are kept in position, so that the flexibility of the braiding process with respect to the core geometry as in conventional braiding techniques is maintained.
  • the fusible, elastic thermoplastic threads containing support threads 4b nestle so tightly between the reinforcing fibers 4a, that this virtually without gap parallel to come lie. In this way, flat, non-wavy individual layers (so-called unidirectional layers) are deposited on the braided core 1, which improves the mathematical predictability of the fiber structure of such braids, since existing theoretical models for unidirectional scrim can be used.
  • each unidirectional individual layers are stored.
  • the braiding can also take place only in one direction of movement, wherein a renewed approach of the braiding threads can be avoided, for example by removing the braid threads in the longitudinal direction of the braided core 1.
  • the previously deposited single layer can be prefixed by brushing the braided thermoplastic threads. This can be done either by local heating or by applying a vacuum tube with subsequent heating. The latter has the advantage that the ripple is further reduced.
  • Fig. 2 schematically shows the thread guide on the braid core 1 in front view in an asymmetric assignment of the clapper.
  • the clappers are in Fig. 2 not shown for reasons of clarity.
  • Three quarters of the clappers run counterclockwise around the braid core 1 and are covered with Verstarkungsfäden 4a.
  • the remaining bobbins, which run in the clockwise direction around the braid core 1, are covered with support threads 4b (shown in dashed lines).
  • support threads 4b shown in dashed lines.
  • Fig. 3 the occupation of the braiding machine for the laying of reinforcing threads and support threads in the ratio 3: 1 in a schematic representation. Every line of Fig. 3 shows the position of the clappers after a quarter turn.
  • the rectangles marked in gray stand for clappers that run counterclockwise around the core of the braid.
  • the rectangles with the crosses stand for clappers that run in a clockwise direction, and the white rectangles stand for empty squares.
  • Figs. 2 and 3 are for illustrative purposes only.
  • braided semifinished fiber composite products according to the invention consist of a multiplicity of unidirectional individual layers deposited in layers, wherein each individual layer has interlaced supporting threads which at least partially consist of thermoplastic threads.
  • supporting threads which have a melting temperature of about 85 ° C, these dissolve during infiltration of the mesh in the matrix system.
  • support threads or support thread compositions can be used, which dissolve only partially when infiltrating the braid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Moulding By Coating Moulds (AREA)

Claims (9)

  1. Procédé de fabrication de produits semi-finis composites renforcés par des fibres au moyen d'une technique de tressage rond, dans lequel :
    un noyau de tresse (1) est tressé avec des fils de tressage (4a, 4b) qui sont embobinés concentriquement dans un sens différent en tresses périphériques (5a, 5b) autour du noyau de tresse (1),
    les tresses (5a) d'un sens périphérique sont pourvues de fils de renfort (4a) et les tresses (5b) du sens opposé sont pourvues au moins partiellement de fils de support (4b), et
    les fils de support (4b) consistent au moins partiellement en fils thermoplastiques dont la température de fusion se situe dans la plage de la température d'infiltration, de sorte que les fils de support (4b), lors de l'infiltration de la natte par un système matriciel, fondent au moins partiellement.
  2. Procédé selon la revendication 1, caractérisé en ce que les fils de renfort (4a) sont maintenus en position par les fils de support (4b).
  3. Procédé selon une des revendications 1 ou 2, caractérisé en ce que le noyau de tresse (1) est tressé plusieurs fois, des couches unidirectionnelles distinctes étant respectivement déposées sur le noyau de tresse (1).
  4. Procédé selon la revendication 3, caractérisé en ce que, avant le dépôt d'une nouvelle couche distincte, la couche distincte déposée auparavant est fixée par fusion des fils thermoplastiques.
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce que le nombre des tresses périphériques dans un sens n'est pas égal au nombre de tresses périphériques dans le sens opposé.
  6. Procédé selon une des revendications précédentes, caractérisé en ce qu'on utilise comme fils de renfort (4a), des fibres de carbone, de verre, d'aramide et/ou de kevlar.
  7. Procédé selon une des revendications précédentes, caractérisé en ce que les fils de support (4b) sont composés du moins partiellement de fils Grillon®.
  8. Produit semi-fini composite renforcé par des fibres fabriqué par un procédé selon une des revendications 1 à 7, composé d'une multitude de couches unidirectionnelles distinctes déposées couche par couche, chaque couche distincte présentant des fils de renfort (4a) et des fils de support (4b) composés au moins partiellement de fils thermoplastiques, les fils de support (4b) pouvant être fondus du moins partiellement lors de l'infiltration de la natte dans un système matriciel.
  9. Produit semi-fini composite renforcé par des fibres selon la revendication 8, caractérisé en ce que les fils de support (4b) sont composés du moins partiellement de fils Grillon®.
EP05733313A 2004-04-06 2005-04-06 Procede pour fabriquer des produits semi-finis composites renforces par des fibres au moyen d'une technique de tressage rond Expired - Lifetime EP1738005B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004017311A DE102004017311B4 (de) 2004-04-06 2004-04-06 Verfahren zum Herstellen von Faserverbund-Halbzeugen mittels Rundflechttechnik
PCT/DE2005/000603 WO2005098117A1 (fr) 2004-04-06 2005-04-06 Procede pour fabriquer des produits semi-finis composites renforces par des fibres au moyen d'une technique de tressage rond

Publications (2)

Publication Number Publication Date
EP1738005A1 EP1738005A1 (fr) 2007-01-03
EP1738005B1 true EP1738005B1 (fr) 2009-02-11

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EP05733313A Expired - Lifetime EP1738005B1 (fr) 2004-04-06 2005-04-06 Procede pour fabriquer des produits semi-finis composites renforces par des fibres au moyen d'une technique de tressage rond

Country Status (7)

Country Link
US (1) US7581479B2 (fr)
EP (1) EP1738005B1 (fr)
JP (1) JP4754554B2 (fr)
AT (1) ATE422573T1 (fr)
DE (2) DE102004017311B4 (fr)
ES (1) ES2320680T3 (fr)
WO (1) WO2005098117A1 (fr)

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Also Published As

Publication number Publication date
US20070193439A1 (en) 2007-08-23
DE102004017311B4 (de) 2012-03-29
ES2320680T3 (es) 2009-05-27
JP2007537363A (ja) 2007-12-20
JP4754554B2 (ja) 2011-08-24
DE502005006603D1 (de) 2009-03-26
EP1738005A1 (fr) 2007-01-03
WO2005098117A1 (fr) 2005-10-20
DE102004017311A1 (de) 2005-11-03
ATE422573T1 (de) 2009-02-15
US7581479B2 (en) 2009-09-01

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