EP2816147A1 - A table and a method for needling a textile structure formed from an annular fiber preform, with radial offsetting of the needling head - Google Patents

A table and a method for needling a textile structure formed from an annular fiber preform, with radial offsetting of the needling head Download PDF

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Publication number
EP2816147A1
EP2816147A1 EP14172899.8A EP14172899A EP2816147A1 EP 2816147 A1 EP2816147 A1 EP 2816147A1 EP 14172899 A EP14172899 A EP 14172899A EP 2816147 A1 EP2816147 A1 EP 2816147A1
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EP
European Patent Office
Prior art keywords
needling
head
preform
rotation
fiber preform
Prior art date
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Granted
Application number
EP14172899.8A
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German (de)
French (fr)
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EP2816147B1 (en
Inventor
Patrice Gautier
Franck Ribas
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Safran Landing Systems SAS
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Messier Bugatti Dowty SA
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Publication of EP2816147A1 publication Critical patent/EP2816147A1/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H18/00—Needling machines
    • D04H18/02—Needling machines with needles
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs

Definitions

  • the present invention relates to the general field of the needling of an annular fiber preform for the production of needle-punched textile structures.
  • a circular needling table comprises a horizontal plate on which is placed an annular fiber preform, drive means (usually friction) in rotation of the fibrous preform around a vertical axis of rotation, and a needling device having a needling head extending over an angular sector of the plate and driven in vertical reciprocating movement with respect to the plate.
  • the annular fiber preform is deposited on the bed of the needling table in layers which are superimposed on each other.
  • the fibrous preform is rotated about the vertical axis and is struck by the needling head at each passage under the latter so as to bind the different layers together.
  • a stepwise descent movement is generally imposed on the table as the layers of the fibrous preform are superimposed and needled.
  • the mechanical characteristics of the final product thus obtained depend strongly on the actual needling density used for the fibrous reinforcement.
  • This actual needling density depends in particular on the needling density per unit area, the penetration rate of the needles, the pitch of movement down the table and the functional characteristics of the needles.
  • the present invention therefore proposes a needling table and its associated method which overcomes such disadvantages by allowing a more homogeneous needling of the fibrous preform while promoting the expansion of the fibers.
  • a circular needling table of a textile structure formed from an annular fiber preform comprising a horizontal plate on which is intended to be deposited an annular fiber preform, rotational drive means the fibrous preform around a vertical axis of rotation, and a needling device of the fibrous preform having a needling head extending over a predetermined angular sector of the plate and animated with a vertical movement back and forth relative to the plate, the table further comprising means for moving the needling head in a radial direction relative to the axis of rotation of the fiber preform.
  • the needling head is controlled to move radially during the process of needling the fibrous preform so as to create offsets in the position of the needles striking the fiber preform. This piloting of the needling head thus makes it possible to obtain a more uniform needling of the fibrous preform and to promote the expansion of the fibers of the preform, which then improves the infiltration of the matrix material into the porosity of the preform. .
  • the needling device may comprise a vertical support animated by a vertical movement back and forth relative to the plate and on which is mounted the needling head, and an electric motor mounted on the support and whose shaft output is coupled to the needling head to move it in a radial direction relative to the axis of rotation of the fiber preform.
  • the motor is preferably a linear stepper motor.
  • the support of the needling device further comprises an end-of-travel sensor for the displacement of the needling head. This sensor makes it possible to "zero" the needling head.
  • the invention also relates to a needling process of a textile structure formed from an annular fiber preform, comprising the laying on a horizontal plate in superposed layers of an annular fibrous preform, the setting in rotation on the plateau of the annular fibrous preform around an axis of vertical rotation, and the needling of the fibrous preform by a needling head extending over a predetermined angular sector of the plateau and animated by a vertical movement back and forth with respect to the plate, the method further comprising, during needling of the fiber preform, moving the needling head in a radial direction relative to the axis of rotation of the preform fibrous.
  • the needling head may be moved radially by the same predetermined pitch between two consecutive turns of the fibrous preform around the axis of rotation.
  • the needling head can be moved radially at the same predetermined pitch at each new turn of the fibrous preform around the axis of rotation.
  • the pitch and the number of displacements of the needling head are a function of the desired needling density.
  • the invention is applicable to any circular needling process in which annular textile layers (or layers) are stacked and needled on a tray to form a needled fibrous preform of annular shape.
  • These layers may be previously formed by juxtaposed rings or ring sectors cut from a non-woven fabric or fabric of unidirectional or multidirectional fibers. They can also be formed by coils wound flat from a feeding device such as that described in the patent application. WO 02/088449 or by turns formed from deformed braids, or by turns formed from a deformable two-dimensional texture (braid or helical fabric).
  • a circular needling table 10 according to the invention for the implementation of such a needling process is very schematically represented on the Figures 1A-1B and 2 .
  • the fibrous annular preform 12 to needling is brought directly onto a horizontal plate 14 of the needling table.
  • This preform 12 is rotated about a vertical axis of rotation 16, for example by means of conical rollers 18a, 18b kept in permanent contact with the preform ( figure 2 ).
  • this device for rotating the preform comprises two conical rollers spaced from each other by 120 ° and each actuated by an independent geared motor 20a, 20b.
  • a common drive coupled with a suitable kinematics could also be considered.
  • the annular preform 12 thus rotated passes a needling device 22 comprising in particular a needling head 24 which overhangs a predetermined angular sector of the horizontal plate 14.
  • This needling head is driven by a vertical reciprocating movement (c). that is to say, back-and-forth) with respect to the plate 14 by means of a suitable drive device 26 (for example of the crank-rod type).
  • the needling head 24 carries a specified number of needles 28 which are provided with barbs, hooks or forks to take fibers from the stacked layers of the annular preform and transfer them therethrough as they enter the preform .
  • these needles 28 are arranged in several rows of needles 30.
  • the plate 14 of the needling table comprises a series of vertical perforations 32 located facing the needles 28 of the needling head for the passage thereof during the needling of the first layers of the annular preform .
  • the plate of the needling table is moved vertically, by means of suitable motor means 34, of a determined descent step substantially corresponding to the thickness of a needled layer.
  • the needling device 22 further comprises means for allowing the needling head 24 to move in a direction radial to the axis of rotation 16 of the fiber preform 12.
  • the needling device 22 comprises a vertical support 36 on which the needling head 24 is mounted, this support being driven by the vertical reciprocating movement via the drive device 26.
  • the support 36 of the needling device carries, in its upper part, an electric motor 38 whose output shaft 40 is coupled to the needling head 24 to move it in a direction radial relative to the axis of rotation of the fibrous preform.
  • a linear stepper motor 38 will be used for which the output shaft 40 moves linearly.
  • This output shaft is oriented in a radial direction and connected to the needling head, for example by means of a bracket 42.
  • the needling head 22 is mounted on the support 36 of the needling device so as to be able to slide along an upper edge 36a thereof between two extreme positions, namely a retracted position ( Figure 1A ) and an advanced position (the advance is shown schematically by the distance A on the Figure 1B ).
  • the impact of the needles 28 carried by the needling head on the fibrous preform below will not be the same (the rows of needles 30 will hit at different locations with each movement of the needling head). This is called the introduction of a radial offset in the needling of the fiber preform.
  • the motor 38 for moving the needling head 22 is controlled by a control device (not shown) which is programmed according to the selected parameters of the needling range.
  • the control device ensures control of the needling head during the entire needling process of the textile structure to be produced.
  • control device may be programmed to introduce a radial offset of the same predetermined pitch between two consecutive turns of the fibrous preform around its axis of rotation.
  • the needling head is positioned according to one of its extreme positions ( Figure 1A or Figure 1B ) for the entire first round of the fiber preform. Then, for the next round as a whole, the needling head is shifted radially towards the other end position by a predetermined pitch p (for example corresponding to half the distance separating two adjacent rows of needles). On the next turn, the needling head is returned to its original end position, and so on.
  • a predetermined pitch p for example corresponding to half the distance separating two adjacent rows of needles.
  • the controller may be programmed to introduce a radial offset of an even predetermined for each new round of the fiber preform (ie no offset in the 1 st turn, offset of a predetermined pitch p in the 2 nd round, shift with one step p + p, ie 2 p on the next turn, shift by one step p + p + p or 3 p on the next turn, etc.).
  • a limit switch 44 is advantageously positioned on the support 36 of the needling device. This sensor 44 makes it possible to detect when the needling head 22 has arrived in one of its extreme positions (for example the retracted position) so as to initiate the piloting process of the head. needling, that is to say to perform the origin "0" of the needling head before the start of the shift sequence.
  • control device it is possible to envisage other ways of programming the control device to introduce radial offsets in the needling. For example, it is possible to consider any shift for the first 3 turns of the fibrous preform, then introduction of the same pitch shift p for the next three turns, then again no shift for the next three laps, etc. .
  • FIGs 3A and 3B show needling results obtained by a needling process of the prior art ( figure 3A ) and by a needling process according to the invention ( figure 3B ) that is to say in which a radial needling offset is introduced.
  • the figure 3A shows the impacts of the needles of a needling head driven according to the prior art, this needling head being provided with four rows of needles.
  • the direction of rotation of the preform is shown schematically by the arrow ⁇ .
  • the needling diagram obtained comprises four rows of holes 46 corresponding to the four rows of needles of the needling head.
  • the needling was performed by performing six complete turns of the fibrous preform around its axis of rotation.
  • the holes made during the 1 st and 4 th passes of the fiber preform under the needling head bear the reference “1”
  • the holes made during the 2 nd and 5 th passes are referenced by “2”
  • the holes made during the 3 rd and 6 th passages bear the reference '3'.
  • This circumferential offset d is deliberately introduced by adjusting the speed of advance of the fibrous preform around its axis of rotation so as to multiply as much as possible the impact locations of the needles.
  • the figure 3B picks up the same needling head with its four rows of needles and six full laps of the fibrous preform around its axis of rotation but controlling the needling head according to the invention, that is to say by introducing a radial offset.
  • a radial offset of a predetermined pitch p was added after the first three turns of the fiber preform.
  • impacts needles to the 1st, 2nd and 3rd rounds are identical to those of the needling performed according to the figure 3A (holes bearing the references “1” to “3”), while the impacts for the 4 th , 5 th and 6 th rounds are shifted radially by one step p towards the increasing radii of the preform (holes bearing the references “ 4 "to” 6 ").
  • the pitch p corresponds substantially to half the distance separating two adjacent rows of needles.
  • the needling diagram obtained here comprises four rows of holes 46 corresponding to the four needle rows of the needling head and four additional rows of holes 46 'created by the radial offset and formed between the rows of holes 46. .

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne une table et un procédé d'aiguilletage circulaire (10) d'une structure textile formée à partir d'une préforme fibreuse annulaire, la table comprenant un plateau horizontal (14) sur lequel est destiné à être déposée une préforme fibreuse annulaire (12), des moyens d'entraînement en rotation de la préforme fibreuse autour d'un axe de rotation vertical (16), un dispositif d'aiguilletage (22) de la préforme fibreuse ayant une tête d'aiguilletage (24) s'étendant au-dessus d'un secteur angulaire prédéterminé du plateau et animée d'un mouvement vertical de va-et-vient par rapport au plateau, et des moyens (38) pour déplacer la tête d'aiguilletage selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse.The invention relates to a circular needling table and method (10) of a textile structure formed from an annular fiber preform, the table comprising a horizontal plate (14) on which a fibrous preform is to be deposited. annular (12) means for rotating the fibrous preform around a vertical axis of rotation (16), a needling device (22) for the fibrous preform having a needling head (24) extending over a predetermined angular sector of the plate and moved vertically back and forth relative to the plate, and means (38) for moving the needling head in a radial direction relative to to the axis of rotation of the fiber preform.

Description

Arrière-plan deBackground of l'inventionthe invention

La présente invention se rapporte au domaine général de l'aiguilletage d'une préforme fibreuse annulaire pour la réalisation de structures textiles aiguilletées.The present invention relates to the general field of the needling of an annular fiber preform for the production of needle-punched textile structures.

Il est connu d'utiliser une table d'aiguilletage de type circulaire pour la fabrication de structures textiles annulaires destinées à constituer le renfort fibreux de pièces annulaires en matériau composite, notamment des disques de frein, tels que des disques en matériau composite carbone/carbone (C/C) pour des freins d'avion.It is known to use a circular needling table for the manufacture of annular textile structures intended to constitute the fiber reinforcement of annular pieces made of composite material, in particular brake discs, such as discs made of carbon / carbon composite material. (C / C) for airplane brakes.

Typiquement, une table d'aiguilletage circulaire comprend un plateau horizontal sur lequel est posée une préforme fibreuse annulaire, des moyens d'entraînement (le plus souvent à friction) en rotation de la préforme fibreuse autour d'un axe vertical de rotation, et un dispositif d'aiguilletage ayant une tête d'aiguilletage s'étendant sur un secteur angulaire du plateau et entraînée en mouvement vertical de va-et-vient par rapport au plateau.Typically, a circular needling table comprises a horizontal plate on which is placed an annular fiber preform, drive means (usually friction) in rotation of the fibrous preform around a vertical axis of rotation, and a needling device having a needling head extending over an angular sector of the plate and driven in vertical reciprocating movement with respect to the plate.

La préforme fibreuse annulaire est déposée sur le plateau de la table d'aiguilletage en couches qui se superposent les unes aux autres. La préforme fibreuse est entraînée en rotation autour de l'axe vertical et est frappée par la tête d'aiguilletage à chaque passage sous cette dernière de façon à lier entre elles les différentes couches. Un mouvement de descente pas à pas est généralement imposé à la table au fur et à mesure de la superposition et de l'aiguilletage des différentes couches de la préforme fibreuse. On pourra se référer au document WO 02/088451 qui décrit un exemple de réalisation d'une telle table d'aiguilletage.The annular fiber preform is deposited on the bed of the needling table in layers which are superimposed on each other. The fibrous preform is rotated about the vertical axis and is struck by the needling head at each passage under the latter so as to bind the different layers together. A stepwise descent movement is generally imposed on the table as the layers of the fibrous preform are superimposed and needled. We can refer to the document WO 02/088451 which describes an embodiment of such a needling table.

Les caractéristiques mécaniques du produit final ainsi obtenu dépendent fortement de la densité réelle d'aiguilletage retenue pour le renfort fibreux. Cette densité réelle d'aiguilletage dépend notamment de la densité d'aiguilletage par unité de surface, du taux de pénétration des aiguilles, du pas de déplacement en descente de la table et des caractéristiques fonctionnelles des aiguilles.The mechanical characteristics of the final product thus obtained depend strongly on the actual needling density used for the fibrous reinforcement. This actual needling density depends in particular on the needling density per unit area, the penetration rate of the needles, the pitch of movement down the table and the functional characteristics of the needles.

Or, avec les procédés d'aiguilletage actuels, il est parfois difficile d'obtenir une parfaite homogénéité d'aiguilletage sur toute la surface de la préforme fibreuse. En outre, le foisonnement des fibres de la préforme fibreuse obtenu lors du passage des aiguilles n'est pas toujours optimal.However, with the current needling processes, it is sometimes difficult to obtain a perfect needling uniformity over the entire surface of the fiber preform. In addition, the expansion of the fibers of the fibrous preform obtained during the passage of the needles is not always optimal.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention propose donc une table d'aiguilletage et son procédé associé qui pallient de tels inconvénients en permettant un aiguilletage plus homogène de la préforme fibreuse tout en favorisant le foisonnement des fibres.The present invention therefore proposes a needling table and its associated method which overcomes such disadvantages by allowing a more homogeneous needling of the fibrous preform while promoting the expansion of the fibers.

Ce but est atteint grâce à une table d'aiguilletage circulaire d'une structure textile formée à partir d'une préforme fibreuse annulaire, comprenant un plateau horizontal sur lequel est destiné à être déposée une préforme fibreuse annulaire, des moyens d'entraînement en rotation de la préforme fibreuse autour d'un axe de rotation vertical, et un dispositif d'aiguilletage de la préforme fibreuse ayant une tête d'aiguilletage s'étendant au-dessus d'un secteur angulaire prédéterminé du plateau et animée d'un mouvement vertical de va-et-vient par rapport au plateau, la table comportant en outre des moyens pour déplacer la tête d'aiguilletage selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse.This object is achieved by means of a circular needling table of a textile structure formed from an annular fiber preform, comprising a horizontal plate on which is intended to be deposited an annular fiber preform, rotational drive means the fibrous preform around a vertical axis of rotation, and a needling device of the fibrous preform having a needling head extending over a predetermined angular sector of the plate and animated with a vertical movement back and forth relative to the plate, the table further comprising means for moving the needling head in a radial direction relative to the axis of rotation of the fiber preform.

La tête d'aiguilletage est pilotée pour se déplacer radialement au cours du processus d'aiguilletage de la préforme fibreuse de sorte à créer des décalages dans la position des aiguilles venant frapper la préforme fibreuse. Ce pilotage de la tête d'aiguilletage permet ainsi d'obtenir un aiguilletage plus uniforme de la préforme fibreuse et de favoriser le foisonnement des fibres de la préforme, ce qui améliore ensuite l'infiltration du matériau de la matrice dans la porosité de la préforme.The needling head is controlled to move radially during the process of needling the fibrous preform so as to create offsets in the position of the needles striking the fiber preform. This piloting of the needling head thus makes it possible to obtain a more uniform needling of the fibrous preform and to promote the expansion of the fibers of the preform, which then improves the infiltration of the matrix material into the porosity of the preform. .

Le dispositif d'aiguilletage peut comprendre un support vertical animé d'un mouvement vertical de va-et-vient par rapport au plateau et sur lequel est montée la tête d'aiguilletage, et un moteur électrique monté sur le support et dont l'arbre de sortie est couplé à la tête d'aiguilletage pour la déplacer selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse. Dans ce cas, le moteur est de préférence un moteur linéaire pas à pas.The needling device may comprise a vertical support animated by a vertical movement back and forth relative to the plate and on which is mounted the needling head, and an electric motor mounted on the support and whose shaft output is coupled to the needling head to move it in a radial direction relative to the axis of rotation of the fiber preform. In this case, the motor is preferably a linear stepper motor.

De préférence, le support du dispositif d'aiguilletage comprend en outre un capteur de fin de course du déplacement de la tête d'aiguilletage. Ce capteur permet de réaliser une « mise à zéro » de la tête d'aiguilletage.Preferably, the support of the needling device further comprises an end-of-travel sensor for the displacement of the needling head. This sensor makes it possible to "zero" the needling head.

Corrélativement, l'invention concerne également un procédé d'aiguilletage d'une structure textile formée à partir d'une préforme fibreuse annulaire, comprenant la dépose sur un plateau horizontal en couches superposées d'une préforme fibreuse annulaire, la mise en rotation sur le plateau de la préforme fibreuse annulaire autour d'un axe de rotation vertical, et l'aiguilletage de la préforme fibreuse par une tête d'aiguilletage s'étendant au-dessus d'un secteur angulaire prédéterminé du plateau et animée d'un mouvement vertical de va-et-vient par rapport au plateau, le procédé consistant en outre, au cours de l'aiguilletage de la préforme fibreuse, à déplacer la tête d'aiguilletage selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse.Correspondingly, the invention also relates to a needling process of a textile structure formed from an annular fiber preform, comprising the laying on a horizontal plate in superposed layers of an annular fibrous preform, the setting in rotation on the plateau of the annular fibrous preform around an axis of vertical rotation, and the needling of the fibrous preform by a needling head extending over a predetermined angular sector of the plateau and animated by a vertical movement back and forth with respect to the plate, the method further comprising, during needling of the fiber preform, moving the needling head in a radial direction relative to the axis of rotation of the preform fibrous.

La tête d'aiguilletage peut être déplacée radialement d'un même pas prédéterminé entre deux tours consécutifs de la préforme fibreuse autour de l'axe de rotation.The needling head may be moved radially by the same predetermined pitch between two consecutive turns of the fibrous preform around the axis of rotation.

Alternativement, la tête d'aiguilletage peut être déplacée radialement d'un même pas prédéterminé à chaque nouveau tour de la préforme fibreuse autour de l'axe de rotation.Alternatively, the needling head can be moved radially at the same predetermined pitch at each new turn of the fibrous preform around the axis of rotation.

Le pas et le nombre de déplacements de la tête d'aiguilletage sont fonction de la densité d'aiguilletage souhaitée.The pitch and the number of displacements of the needling head are a function of the desired needling density.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-dessous, en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif. Sur les figures :

  • les figures 1A-1B et 2 représentent schématiquement une table d'aiguilletage circulaire conforme à l'invention, respectivement en vue de côté et en vue de dessus ; et
  • les figures 3A et 3B montrent un exemple comparatif de mise en oeuvre du procédé d'aiguilletage selon l'invention au moyen de la table des figures 1A-1B et 2.
Other features and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate an embodiment having no limiting character. In the figures:
  • the Figures 1A-1B and 2 schematically represent a circular needling table according to the invention, respectively in side view and in top view; and
  • the Figures 3A and 3B show a comparative example of implementation of the needling process according to the invention by means of the table of Figures 1A-1B and 2 .

Description détaillée de l'inventionDetailed description of the invention

L'invention s'applique à tout processus d'aiguilletage circulaire dans lequel des couches (ou strates) textiles annulaires sont empilées et aiguilletées sur un plateau pour former une préforme fibreuse aiguilletée de forme annulaire.The invention is applicable to any circular needling process in which annular textile layers (or layers) are stacked and needled on a tray to form a needled fibrous preform of annular shape.

Ces couches peuvent être formées préalablement par des anneaux ou des secteurs d'anneau juxtaposés découpés dans un tissu ou un matériau non tissé de fibres unidirectionnelles ou multidirectionnelles. Elles peuvent aussi être formées par des spires enroulées à plat à partir d'un dispositif d'alimentation tel que celui décrit dans la demande de brevet WO 02/088449 , ou par des spires formées à partir de tresses déformées, ou encore par des spires formées à partir d'une texture bidimensionnelle déformable (tresse ou tissu hélicoïdal).These layers may be previously formed by juxtaposed rings or ring sectors cut from a non-woven fabric or fabric of unidirectional or multidirectional fibers. They can also be formed by coils wound flat from a feeding device such as that described in the patent application. WO 02/088449 or by turns formed from deformed braids, or by turns formed from a deformable two-dimensional texture (braid or helical fabric).

Une table d'aiguilletage circulaire 10 conforme à l'invention pour la mise en oeuvre d'un tel processus d'aiguilletage est représentée de façon très schématique sur les figures 1A-1B et 2.A circular needling table 10 according to the invention for the implementation of such a needling process is very schematically represented on the Figures 1A-1B and 2 .

La préforme annulaire 12 fibreuse à aiguilleter est amenée directement sur un plateau horizontal 14 de la table d'aiguilletage. Cette préforme 12 est entraînée en rotation autour d'un axe de rotation vertical 16, par exemple au moyen de rouleaux coniques 18a, 18b maintenus en contact permanents avec la préforme (figure 2).The fibrous annular preform 12 to needling is brought directly onto a horizontal plate 14 of the needling table. This preform 12 is rotated about a vertical axis of rotation 16, for example by means of conical rollers 18a, 18b kept in permanent contact with the preform ( figure 2 ).

Typiquement, ce dispositif d'entraînement en rotation de la préforme comprend deux rouleaux coniques espacés l'un de l'autre de 120° et actionnés chacun par un groupe moto-réducteur indépendant 20a, 20b. Toutefois, une motorisation commune couplée à une cinématique adaptée pourrait être aussi envisagée.Typically, this device for rotating the preform comprises two conical rollers spaced from each other by 120 ° and each actuated by an independent geared motor 20a, 20b. However, a common drive coupled with a suitable kinematics could also be considered.

De manière plus générale, d'autres moyens pour entraîner en rotation la préforme fibreuse autour de l'axe vertical 16 pourraient être envisagés.More generally, other means for rotating the fiber preform around the vertical axis 16 could be envisaged.

La préforme annulaire 12 ainsi mise en rotation passe devant un dispositif d'aiguilletage 22 comprenant notamment une tête d'aiguilletage 24 qui surplombe un secteur angulaire prédéterminé du plateau horizontal 14. Cette tête d'aiguilletage est animée d'un mouvement vertical alternatif (c'est-à-dire de va-et-vient) par rapport au plateau 14 au moyen d'un dispositif d'entraînement 26 adéquat (par exemple de type bielle-manivelle).The annular preform 12 thus rotated passes a needling device 22 comprising in particular a needling head 24 which overhangs a predetermined angular sector of the horizontal plate 14. This needling head is driven by a vertical reciprocating movement (c). that is to say, back-and-forth) with respect to the plate 14 by means of a suitable drive device 26 (for example of the crank-rod type).

La tête d'aiguilletage 24 porte un nombre déterminé d'aiguilles 28 qui sont munies de barbes, crochets ou fourches pour prélever des fibres dans les couches empilées de la préforme annulaire et les transférer à travers celles-ci lorsqu'elles pénètrent dans la préforme. De façon connue en soi, ces aiguilles 28 sont arrangées selon plusieurs rangées d'aiguilles 30.The needling head 24 carries a specified number of needles 28 which are provided with barbs, hooks or forks to take fibers from the stacked layers of the annular preform and transfer them therethrough as they enter the preform . In a manner known per se, these needles 28 are arranged in several rows of needles 30.

Par ailleurs, le plateau 14 de la table d'aiguilletage comporte une série de perforations verticales 32 localisées en regard des aiguilles 28 de la tête d'aiguilletage pour le passage de celles-ci lors de l'aiguilletage des premières couches de la préforme annulaire. A chaque aiguilletage d'une nouvelle strate, le plateau de la table d'aiguilletage est déplacé verticalement, par l'intermédiaire de moyens moteur 34 adéquats, d'un pas de descente déterminé correspondant sensiblement à l'épaisseur d'une couche aiguilletée.Furthermore, the plate 14 of the needling table comprises a series of vertical perforations 32 located facing the needles 28 of the needling head for the passage thereof during the needling of the first layers of the annular preform . At each needling of a new layer, the plate of the needling table is moved vertically, by means of suitable motor means 34, of a determined descent step substantially corresponding to the thickness of a needled layer.

Conformément à l'invention, le dispositif d'aiguilletage 22 comprend en outre des moyens pour permettre un déplacement de la tête d'aiguilletage 24 selon une direction radiale par rapport à l'axe de rotation 16 de la préforme fibreuse 12.According to the invention, the needling device 22 further comprises means for allowing the needling head 24 to move in a direction radial to the axis of rotation 16 of the fiber preform 12.

Ainsi, dans l'exemple représenté sur les figures 1A-1B et 2, le dispositif d'aiguilletage 22 comprend un support vertical 36 sur lequel est montée la tête d'aiguilletage 24, ce support étant animé du mouvement vertical de va-et-vient par l'intermédiaire du dispositif d'entraînement 26.Thus, in the example shown on the Figures 1A-1B and 2 , the needling device 22 comprises a vertical support 36 on which the needling head 24 is mounted, this support being driven by the vertical reciprocating movement via the drive device 26.

Le support 36 du dispositif d'aiguilletage porte, dans sa partie supérieure, un moteur électrique 38 dont l'arbre de sortie 40 est couplé à la tête d'aiguilletage 24 pour la déplacer selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse.The support 36 of the needling device carries, in its upper part, an electric motor 38 whose output shaft 40 is coupled to the needling head 24 to move it in a direction radial relative to the axis of rotation of the fibrous preform.

De préférence, on utilisera un moteur linéaire pas à pas 38 pour lequel l'arbre de sortie 40 se déplace de façon linéaire. Cet arbre de sortie est orienté selon une direction radiale et relié à la tête d'aiguilletage par exemple par l'intermédiaire d'une équerre 42.Preferably, a linear stepper motor 38 will be used for which the output shaft 40 moves linearly. This output shaft is oriented in a radial direction and connected to the needling head, for example by means of a bracket 42.

Comme représenté sur les figures 1A-1B et 2, la tête d'aiguilletage 22 est montée sur le support 36 du dispositif d'aiguilletage de façon à pouvoir coulisser le long d'une arête supérieure 36a de celui-ci entre deux positions extrêmes, à savoir une position reculée (figure 1A) et une position avancée (l'avance est schématisée par la distance A sur la figure 1B).As shown on Figures 1A-1B and 2 , the needling head 22 is mounted on the support 36 of the needling device so as to be able to slide along an upper edge 36a thereof between two extreme positions, namely a retracted position ( Figure 1A ) and an advanced position (the advance is shown schematically by the distance A on the Figure 1B ).

En fonction de la position de la tête d'aiguilletage entre ces deux positions extrêmes, l'impact des aiguilles 28 portées par la tête d'aiguilletage sur la préforme fibreuse située en dessous ne sera pas le même (les rangées d'aiguilles 30 frapperont à des endroits différents à chaque déplacement de la tête d'aiguilletage). On parle ainsi de l'introduction d'un décalage radial dans l'aiguilletage de la préforme fibreuse.Depending on the position of the needling head between these two extreme positions, the impact of the needles 28 carried by the needling head on the fibrous preform below will not be the same (the rows of needles 30 will hit at different locations with each movement of the needling head). This is called the introduction of a radial offset in the needling of the fiber preform.

Le moteur 38 de déplacement de la tête d'aiguilletage 22 est commandé par un dispositif de commande (non représenté) qui est programmé suivant les paramètres choisis de la gamme d'aiguilletage. Ainsi, en fonction des critères d'aiguilletage à appliquer, le dispositif de commande assure un pilotage de la tête d'aiguilletage au cours de l'ensemble du processus d'aiguilletage de la structure textile à réaliser.The motor 38 for moving the needling head 22 is controlled by a control device (not shown) which is programmed according to the selected parameters of the needling range. Thus, depending on the needling criteria to be applied, the control device ensures control of the needling head during the entire needling process of the textile structure to be produced.

Par exemple, le dispositif de commande pourra être programmé pour introduire un décalage radial d'un même pas prédéterminé entre deux tours consécutifs de la préforme fibreuse autour de son axe de rotation.For example, the control device may be programmed to introduce a radial offset of the same predetermined pitch between two consecutive turns of the fibrous preform around its axis of rotation.

En d'autres termes, dans un tel exemple, la tête d'aiguilletage est positionnée selon l'une de ses positions extrêmes (figure 1A ou figure 1B) pour l'ensemble du premier tour de la préforme fibreuse. Puis, pour l'ensemble du tour suivant, la tête d'aiguilletage est décalée radialement vers l'autre position extrême d'un pas prédéterminé p (par exemple correspondant à la moitié de la distance séparant deux rangées 30 adjacentes d'aiguilles). Lors du tour suivant, la tête d'aiguilletage est ramenée vers sa position extrême d'origine, et ainsi de suite.In other words, in such an example, the needling head is positioned according to one of its extreme positions ( Figure 1A or Figure 1B ) for the entire first round of the fiber preform. Then, for the next round as a whole, the needling head is shifted radially towards the other end position by a predetermined pitch p (for example corresponding to half the distance separating two adjacent rows of needles). On the next turn, the needling head is returned to its original end position, and so on.

Alternativement, le dispositif de commande pourra être programmé pour introduire un décalage radial d'un même pas prédéterminé pour chaque nouveau tour de la préforme fibreuse (i.e. aucun décalage au 1er tour, décalage d'un pas p prédéterminé au 2nd tour, décalage d'un pas p+p soit 2p au tour suivant, décalage d'un pas p+p+p soit 3p au tour suivant, etc.).Alternatively, the controller may be programmed to introduce a radial offset of an even predetermined for each new round of the fiber preform (ie no offset in the 1 st turn, offset of a predetermined pitch p in the 2 nd round, shift with one step p + p, ie 2 p on the next turn, shift by one step p + p + p or 3 p on the next turn, etc.).

Par ailleurs, un capteur de fin de course 44 est avantageusement positionné sur le support 36 du dispositif d'aiguilletage. Ce capteur 44 permet de détecter lorsque la tête d'aiguilletage 22 est arrivée dans l'une de ses positions extrêmes (par exemple la position reculée) pour ainsi initialiser le processus de pilotage de la tête d'aiguilletage, c'est-à-dire pour effectuer l'origine « 0 » de la tête d'aiguilletage avant le démarrage de la séquence de décalage.Furthermore, a limit switch 44 is advantageously positioned on the support 36 of the needling device. This sensor 44 makes it possible to detect when the needling head 22 has arrived in one of its extreme positions (for example the retracted position) so as to initiate the piloting process of the head. needling, that is to say to perform the origin "0" of the needling head before the start of the shift sequence.

Bien entendu, il est possible d'envisager d'autres façons de programmer le dispositif de commande pour introduire des décalages radiaux dans l'aiguilletage. Par exemple, il est possible d'envisager aucun décalage pour les 3 premiers tours de la préforme fibreuse, puis introduction d'un même décalage de pas p pour les trois tours suivants, puis de nouveau aucun décalage pour les trois tours qui suivent, etc.Of course, it is possible to envisage other ways of programming the control device to introduce radial offsets in the needling. For example, it is possible to consider any shift for the first 3 turns of the fibrous preform, then introduction of the same pitch shift p for the next three turns, then again no shift for the next three laps, etc. .

Les figures 3A et 3B montrent des résultats d'aiguilletage obtenus par un procédé d'aiguilletage de l'art antérieur (figure 3A) et par un procédé d'aiguilletage conforme à l'invention (figure 3B) c'est-à-dire dans lequel un décalage radial d'aiguilletage est introduit.The Figures 3A and 3B show needling results obtained by a needling process of the prior art ( figure 3A ) and by a needling process according to the invention ( figure 3B ) that is to say in which a radial needling offset is introduced.

La figure 3A montre les impacts des aiguilles d'une tête d'aiguilletage pilotée selon de l'art antérieur, cette tête d'aiguilletage étant munie de quatre rangées d'aiguilles. Le sens de rotation de la préforme est schématisé par la flèche ω. Le schéma d'aiguilletage obtenu comprend quatre rangées de perçages 46 correspondant aux quatre rangées d'aiguilles de la tête d'aiguilletage. L'aiguilletage a été réalisé en effectuant six tours complets de la préforme fibreuse autour de son axe de rotation.The figure 3A shows the impacts of the needles of a needling head driven according to the prior art, this needling head being provided with four rows of needles. The direction of rotation of the preform is shown schematically by the arrow ω . The needling diagram obtained comprises four rows of holes 46 corresponding to the four rows of needles of the needling head. The needling was performed by performing six complete turns of the fibrous preform around its axis of rotation.

Sur cette figure 3A, on constate qu'un décalage circonférentiel est introduit à chaque tour de la préforme fibreuse. Ainsi, entre le 1er et le 2ème tour, un décalage circonférentiel d est introduit, de même qu'entre le 2ème tour et le 3ème tour, et ainsi de suite. En particulier, les impacts des aiguilles des 4ème, 5ème et 6ème tours coïncident avec ceux des 1er, 2ème et 3ème tours, respectivement.On this figure 3A it is found that a circumferential offset is introduced at each turn of the fiber preform. Thus, between the 1st and 2nd round a circumferential offset d is introduced and between the 2nd and the 3rd round turn, and so on. In particular, the impact of needles 4 th, 5 th and 6 th rounds coincide with those of the 1st, 2nd and 3rd rounds, respectively.

Ainsi, les perçages réalisés lors des 1er et 4ème passages de la préforme fibreuse sous la tête d'aiguilletage portent la référence « 1 », les perçages réalisés lors des 2ème et 5ème passages sont référencés par « 2 », et les perçages réalisés lors des 3ème et 6ème passages portent la référence « 3 ».Thus, the holes made during the 1 st and 4 th passes of the fiber preform under the needling head bear the reference "1", the holes made during the 2 nd and 5 th passes are referenced by "2", and the holes made during the 3 rd and 6 th passages bear the reference '3'.

Ce décalage circonférentiel d est volontairement introduit en jouant sur la vitesse d'avance de la préforme fibreuse autour de son axe de rotation de sorte à multiplier autant que possible les emplacements d'impact des aiguilles.This circumferential offset d is deliberately introduced by adjusting the speed of advance of the fibrous preform around its axis of rotation so as to multiply as much as possible the impact locations of the needles.

La figure 3B reprend la même tête d'aiguilletage munie de ses quatre rangées d'aiguilles en effectuant également six tours complets de la préforme fibreuse autour de son axe de rotation mais en pilotant la tête d'aiguilletage conformément à l'invention, c'est-à-dire en introduisant un décalage radial.The figure 3B picks up the same needling head with its four rows of needles and six full laps of the fibrous preform around its axis of rotation but controlling the needling head according to the invention, that is to say by introducing a radial offset.

Plus précisément, en plus du décalage circonférentiel d introduit en jouant sur la vitesse d'avance de la préforme fibreuse, il a été ajouté un décalage radial d'un pas prédéterminé p après les trois premiers tours de la préforme fibreuse.Specifically, in addition to the circumferential offset d introduced by adjusting the feed rate of the fiber preform, a radial offset of a predetermined pitch p was added after the first three turns of the fiber preform.

De la sorte, les impacts des aiguilles pour les 1er, 2ème et 3ème tours sont identiques à ceux de l'aiguilletage réalisé selon la figure 3A (perçages portant les références « 1 » à « 3 »), tandis que les impacts pour les 4ème, 5ème et 6ème tours sont décalés radialement d'un pas p vers les rayons croissants de la préforme (perçages portant les références « 4 » à « 6 »). Ici, le pas p correspond sensiblement à la moitié de la distance séparant deux rangées adjacentes d'aiguilles.In this way, impacts needles to the 1st, 2nd and 3rd rounds are identical to those of the needling performed according to the figure 3A (holes bearing the references "1" to "3"), while the impacts for the 4 th , 5 th and 6 th rounds are shifted radially by one step p towards the increasing radii of the preform (holes bearing the references " 4 "to" 6 "). Here, the pitch p corresponds substantially to half the distance separating two adjacent rows of needles.

En comparant les figures 3A et 3B, on constate bien que l'introduction d'un décalage radial lors de l'aiguilletage permet d'obtenir un aiguilletage plus uniforme de la préforme fibreuse et de favoriser le foisonnement des fibres de la préforme. En particulier, le schéma d'aiguilletage obtenu comprend ici quatre rangées de perçages 46 correspondant aux quatre rangées d'aiguilles de la tête d'aiguilletage et quatre rangées supplémentaires de perçages 46' créées par le décalage radial et formées entre les rangées de perçages 46.Comparing the Figures 3A and 3B it is clearly seen that the introduction of a radial offset during needling makes it possible to obtain a more uniform needling of the fibrous preform and to promote the expansion of the fibers of the preform. In particular, the needling diagram obtained here comprises four rows of holes 46 corresponding to the four needle rows of the needling head and four additional rows of holes 46 'created by the radial offset and formed between the rows of holes 46. .

Claims (9)

Table d'aiguilletage circulaire (10) d'une structure textile formée à partir d'une préforme fibreuse annulaire, comprenant : un plateau horizontal (14) sur lequel est destiné à être déposée une préforme fibreuse annulaire (12) ; des moyens (18a, 18b) d'entraînement en rotation de la préforme fibreuse autour d'un axe de rotation vertical (16) ; et un dispositif d'aiguilletage (22) de la préforme fibreuse ayant une tête d'aiguilletage (24) s'étendant au-dessus d'un secteur angulaire prédéterminé du plateau et animée d'un mouvement vertical de va-et-vient par rapport au plateau ; caractérisée en ce qu'elle comporte en outre des moyens (38) pour déplacer la tête d'aiguilletage selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse. A circular needling table (10) of a textile structure formed from an annular fiber preform comprising: a horizontal plate (14) on which is intended to be deposited an annular fiber preform (12); means (18a, 18b) for rotating the fiber preform about a vertical axis of rotation (16); and a needling device (22) of the fibrous preform having a needling head (24) extending over a predetermined angular sector of the tray and moved vertically back and forth relative to on the plateau; characterized in that it further comprises means (38) for moving the needling head in a radial direction relative to the axis of rotation of the fibrous preform. Table selon la revendication 1, dans laquelle le dispositif d'aiguilletage (22) comprend : un support vertical (36) animé d'un mouvement vertical de va-et-vient par rapport au plateau et sur lequel est montée la tête d'aiguilletage (24), et un moteur électrique (38) monté sur le support et dont l'arbre de sortie (40) est couplé à la tête d'aiguilletage pour la déplacer selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse. The table of claim 1, wherein the needling device (22) comprises: a vertical support (36) moving vertically back and forth relative to the plate and on which the needling head (24) is mounted, and an electric motor (38) mounted on the support and whose output shaft (40) is coupled to the needling head to move it in a radial direction relative to the axis of rotation of the fiber preform. Table selon la revendication 2, dans laquelle le moteur (38) est un moteur linéaire pas à pas.The table of claim 2, wherein the motor (38) is a linear stepper motor. Table selon l'une des revendications 2 et 3, dans laquelle la tête d'aiguilletage (24) est apte à coulisser le long d'une arête supérieure (36a) du support (36).Table according to one of claims 2 and 3, wherein the needling head (24) is slidable along an upper edge (36a) of the support (36). Table selon l'une quelconque des revendications 2 à 4, dans laquelle le support (36) du dispositif d'aiguilletage (22) comprend en outre un capteur de fin de course (44) du déplacement de la tête d'aiguilletage (24).Table according to any one of claims 2 to 4, wherein the support (36) of the needling device (22) further comprises a limit sensor (44) of the displacement of the needling head (24) . Procédé d'aiguilletage d'une structure textile formée à partir d'une préforme fibreuse annulaire, comprenant : la dépose sur un plateau horizontal (14) en couches superposées d'une préforme fibreuse annulaire (12) ; la mise en rotation sur le plateau de la préforme fibreuse annulaire autour d'un axe de rotation vertical (16) ; et l'aiguilletage de la préforme fibreuse par une tête d'aiguilletage (24) s'étendant au-dessus d'un secteur angulaire prédéterminé du plateau et animée d'un mouvement vertical de va-et-vient par rapport au plateau ; caractérisé en ce que, au cours de l'aiguilletage de la préforme fibreuse, le procédé consiste à déplacer la tête d'aiguilletage selon une direction radiale par rapport à l'axe de rotation de la préforme fibreuse. A method of needling a textile structure formed from an annular fiber preform, comprising: depositing on an horizontal platen (14) in superposed layers an annular fiber preform (12); rotating on the plate of the annular fibrous preform around a vertical axis of rotation (16); and needling the fibrous preform by a needling head (24) extending over a predetermined angular sector of the tray and moving vertically back and forth relative to the tray; characterized in that , during needling of the fiber preform, the method comprises moving the needling head in a radial direction relative to the axis of rotation of the fibrous preform. Procédé selon la revendication 6, dans lequel la tête d'aiguilletage est déplacée radialement d'un même pas (p) prédéterminé entre deux tours consécutifs de la préforme fibreuse autour de l'axe de rotation.The method of claim 6, wherein the needling head is radially displaced by the same predetermined pitch ( p ) between two consecutive turns of the fibrous preform about the axis of rotation. Procédé selon la revendication 6, dans lequel la tête d'aiguilletage est déplacée radialement d'un même pas (p) prédéterminé à chaque nouveau tour de la préforme fibreuse autour de l'axe de rotation.The method of claim 6, wherein the needling head is radially displaced by the same predetermined pitch ( p ) at each new turn of the fibrous preform about the axis of rotation. Procédé selon l'une des revendications 6 et 7, dans lequel le pas et le nombre de déplacements de la tête d'aiguilletage sont fonction de la densité d'aiguilletage souhaitée.Method according to one of claims 6 and 7, wherein the pitch and the number of displacements of the needling head are a function of the desired needling density.
EP14172899.8A 2013-06-20 2014-06-18 A table and a method for needling a textile structure formed from an annular fiber preform, with radial offsetting of the needling head Active EP2816147B1 (en)

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP3372718A1 (en) * 2017-03-07 2018-09-12 Arianegroup Sas Method for manufacturing a needled fibrous structure
EP3372717A1 (en) * 2017-03-07 2018-09-12 Arianegroup Sas Method for needling a fibrous layer
FR3063744A1 (en) * 2017-03-07 2018-09-14 Airbus Safran Launchers Sas PROCESS FOR NEEDLING A FIBROUS LAYER
FR3063745A1 (en) * 2017-03-07 2018-09-14 Airbus Safran Launchers Sas PROCESS FOR PRODUCING A NEEDLED FIBROUS STRUCTURE
US10704171B2 (en) 2017-03-07 2020-07-07 Arianegroup Sas Method of fabricating a needled fiber structure
US10793982B2 (en) 2017-03-07 2020-10-06 Arianegroup Sas Method of needling a fiber layer
CN111636154A (en) * 2020-06-16 2020-09-08 浙江星辉新材料科技股份有限公司 Carbon fiber crucible acupuncture former
CN114635231A (en) * 2022-03-30 2022-06-17 武汉环宇飞龙新材料科技有限公司 Full-automatic needling device and use method thereof
CN114703605A (en) * 2022-04-07 2022-07-05 浙江星辉新材料科技有限公司 Linkage needling forming equipment for carbon fibers

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US20140373322A1 (en) 2014-12-25
CN104233631B (en) 2018-09-25
FR3007428A1 (en) 2014-12-26
US9428852B2 (en) 2016-08-30
CN104233631A (en) 2014-12-24
EP2816147B1 (en) 2016-02-17
FR3007428B1 (en) 2015-10-16

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