EP3450606B1 - Method of forming by needling an annular textile preform from a helical fibrous web and machine for implementing such a method - Google Patents
Method of forming by needling an annular textile preform from a helical fibrous web and machine for implementing such a method Download PDFInfo
- Publication number
- EP3450606B1 EP3450606B1 EP18185322.7A EP18185322A EP3450606B1 EP 3450606 B1 EP3450606 B1 EP 3450606B1 EP 18185322 A EP18185322 A EP 18185322A EP 3450606 B1 EP3450606 B1 EP 3450606B1
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- EP
- European Patent Office
- Prior art keywords
- forming
- unwinder
- preform
- driven
- needling
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- 238000000034 method Methods 0.000 title claims description 14
- 239000004753 textile Substances 0.000 title claims description 13
- 239000000835 fiber Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 description 9
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000003042 antagnostic effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- 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
- 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 the general field of needling a helical fibrous web for producing an annular textile preform.
- a circular needling machine generally comprises a horizontal annular plate on which is laid a helical fibrous sheet, means (most often friction) for rotating the fibrous sheet around the vertical axis of the plate, and a needling device having a needling head extending over an angular sector of the plate and driven in relative vertical movement with respect to the plate.
- a needling device having a needling head extending over an angular sector of the plate and driven in relative vertical movement with respect to the plate.
- the web forming table is positioned above the needling table and feeds it continuously into a helical fibrous web.
- the needling table discontinuously calls the helical fibrous web.
- the needling table stops feeding the web after cutting the web, during finishing needling, during control operations of the preform, and during the evacuation of the completed preform before taking over complete cycle.
- the continuous operation of the web-forming machine is thus antagonistic with the discontinuous operation of the needling table.
- the present invention therefore has the main object of providing a process for the needling formation of an annular textile preform from a helical fibrous web which does not have the aforementioned drawbacks and makes it possible to accommodate different operations of the web formation and the needling table.
- the invention is remarkable in that it proposes to receive and store the helical fibrous web produced continuously by the web forming table on an intermediate unwinder.
- the invention allows temporary storage of the web between the web forming table and the needling table to overcome the different operating speeds between these two tables.
- the needling table is to be stopped (for example to evacuate a preform made)
- the helical fibrous sheet which is continuously produced by the tablecloth forming table accumulates in coils superimposed on the intermediate unwinder pending starting a new cycle of the needling table. It is thus not necessary to stop the tablecloth during the stopping of the preform forming tray.
- the intermediate plate will perform a complete revolution both. web turns unrolled from the web forming plateau to store a web turn on the intermediate unwinder and another web turn wound in the same direction on the final unwinder.
- the web forming plate and the preform forming plate advantageously have respective average speeds which are equal.
- N DF k ⁇ N FP
- k is a predetermined constant or variable factor corresponding to servo control of the amount of helical fibrous web in a control chute positioned between the final unwinder and the preform forming tray.
- the method further comprises counting the number of turns of helical fibrous web unwound on the intermediate unwinder. This count makes it possible to manage the stopping of the web-forming machine if the maximum (predetermined) quantity of web turns stored on the intermediate unwinder is reached or, conversely, a stopping of the needling machine if the number of revolutions of tablecloth stored on the intermediate unwinder reaches zero.
- the needling of the helical fibrous sheet is interrupted at the end of each annular textile preform forming cycle in order to make it possible to evacuate said preform.
- the invention also relates to a circular needling machine for implementing the method of forming an annular textile preform from a helical fibrous web as defined above, comprising a horizontal sheet-forming plateau intended to to form a helical fibrous web and animated with a constant and predefined rotary speed N FS , a horizontal intermediate plate positioned under the web forming plate and driven by a rotating speed N FI , a horizontal intermediate unwinder positioned on the intermediate plate and driven by a rotating speed N DI , a final horizontal unwinder positioned under the intermediate unwinder and animated with a rotational speed N DF , and a horizontal plateau forming preform positioned under the final unwinder and animated with a rotating speed N FP variable and predefined.
- the machine further comprises a flow control chute of the helical fibrous web positioned between the final unwinder and the preform forming plate.
- the intermediate and final unwinders may each comprise two curved circular conveyor portions disposed opposite one another.
- the preform forming plate may comprise a needling head with a vertical movement back and forth relative to the plate.
- the figure 1 illustrates very schematically a circular needling machine 2 according to the invention which is intended for the formation of an annular preform from a fibrous web (or band) helical.
- such a circular needling machine 2 comprises a web forming table 4 intended to form a helical fibrous web (for example by weaving).
- This tablecloth forming table comprises in particular a horizontal sheet forming plateau 6 on which is positioned the fibrous web 8 being formed.
- the sheet forming tray 6 is driven in a rotational movement around a vertical axis 10.
- the formation of the sheet being an operation can be carried out continuously at the same speed, the sheet forming plateau 6 is more precisely driven by a rotational movement at a rotating speed N FS which is constant and predefined.
- the circular needling table 2 also comprises a final unwinder 12 located below the tablecloth forming table 4, this final unwinder being typically intended to unwind the fibrous web 8 wound on the tablecloth forming tray 6 for the bring to needling.
- the final unwinder 12 comprises a circular conveyor 14 for rotating the fibrous web 8 around the vertical axis 10.
- This circular conveyor 14 may advantageously be formed of two curved conveyor portions 14a, 14b which are each half-shaped. -disque and which are arranged opposite one another (the straight edges of these conveyor portions are parallel and face to face). The direction of rotation of these curved conveyor portions is directed so as to cause a complete turn of 360 ° to the fibrous web 8 about the vertical axis 10.
- the circular conveyor 14 of the final unwinder 12 is controlled to turn the fibrous web 8 around the vertical axis at a rotating speed N DF .
- a needling table 16 which is intended to ensure a circular needling of the fibrous web 8 unwound from the final unwinder.
- the needling table 16 is known, for example from the publication EP 2,339,055 , and will not be described in detail. Briefly, it comprises a horizontal preform forming plate 18 which receives the fibrous web to drive it in rotation about the vertical axis 10 at a rotational speed N FP , this speed being adjustable.
- the fibrous web undergoes a needling by a needling head (not shown in FIG. figure 1 ) extending over an angular sector of the web-forming platen and moved vertically back and forth relative thereto.
- the fibrous web 8 which is unwound from the circular conveyor 14 of the The final unwinder is conveyed to the preform forming tray 18 through a web flow control chute 20 extending vertically between the final unwinder and the preform tray.
- a web flow control chute 20 extending vertically between the final unwinder and the preform tray.
- the rotary speed N FP of the preform forming plate 18 is by nature non-constant since it is necessary in particular at the end of each preform formation cycle by needling (after the needling of a predefined number of layers of fibrous web) to stop the rotation of the plate to evacuate the preform before starting a new cycle.
- this rotary speed N FP is a predefined datum which is different from the rotary speed N FS of the web forming plate 6.
- a horizontal intermediate unwinder 24 is positioned on the intermediate plate 22 and driven by a rotating speed N DI .
- this intermediate unwinder includes a circular conveyor 26 that can be composed of two curved conveyor portions 26a, 26b which are each in the form of a half-disk and which are arranged facing each other , the direction of rotation of these curved portions being directed so as to cause a complete turn of 360 ° to the fibrous web 8 about the vertical axis 10.
- control of the circular needling machine according to the invention and in particular the rotational speeds of the various elements that constitute it, is as follows.
- the speeds N FS (of the web formation plateau 6) and N FP (of the preform formation plateau 18) are input variables that are known. Moreover, these plates 4, 18 have respective average speeds which are equal.
- control equation (a) is a consequence of the presence of the regulation channel of the unwinding of the web 20 between the final unwinder and the preform forming plate. More precisely, this equation is equivalent to: ## EQU1 ## in which k is a predetermined constant or variable factor corresponding to a control regulation of the quantity of helical fibrous sheet in the regulation chute.
- control equations (b) and (c) are in particular intended to ensure storage of several turns of fibrous web on the intermediate unwinder without constraining the fibrous web between the intermediate unwinder and the final unwinder and without constraining the fibrous web at the exit of the tablecloth forming tray.
- the figure 2 shows an example of a speed control of the various elements of the circular needling machine according to the invention.
- this figure shows an example of cyclic chronograms of the speeds N FP , N FS , N F1 , and N DI satisfying the control equations (a) to (c) according to the invention.
- the speed N FS of the tablecloth is programmed to be constant and equal to 6 rpm.
- the speed N FP of the preform forming plate is programmed to vary cyclically between 0 and 10 rpm.
- a zero N FP speed corresponds to the stop time of the preform forming plate necessary to evacuate the preform once it has been completed and to reset the machine before restarting for a new training cycle.
- This downtime is typically of the order of 50s or so.
- N TS represents the number of turns of fibrous web that accumulates on the intermediate unwinder.
- the control of the speeds N DF , N FI and N DI makes it possible to continuously accumulate between 2 and 10 turns of fibrous web on the intermediate unwinder.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Description
La présente invention se rapporte au domaine général de l'aiguilletage d'une nappe fibreuse hélicoïdale pour la réalisation d'une préforme textile annulaire.The present invention relates to the general field of needling a helical fibrous web for producing an annular textile preform.
Il est connu d'utiliser une machine d'aiguilletage de type circulaire pour la fabrication de préformes 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 type needling machine for producing annular textile preforms 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.
Une machine d'aiguilletage circulaire comprend généralement un plateau annulaire horizontal sur lequel est posée une nappe fibreuse hélicoïdale, des moyens (le plus souvent à friction) d'entraînement en rotation de la nappe fibreuse autour de l'axe vertical du plateau, et un dispositif d'aiguilletage ayant une tête d'aiguilletage s'étendant sur un secteur angulaire du plateau et entraînée en mouvement vertical relatif par rapport au plateau. On pourra se référer au document
Dans le cadre de l'industrialisation de la production de préformes textiles annulaires, il est généralement prévu d'associer une table de formation de nappe fibreuse hélicoïdale (ou nappe spiralée) à la machine d'aiguilletage précédemment décrite. En pratique, la table de formation de nappe est positionnée au-dessus de la table d'aiguilletage et alimente celle-ci en continu en nappe fibreuse hélicoïdale. Or, si la table de formation de nappe a un fonctionnement continu, la table d'aiguilletage appelle de façon discontinue la nappe fibreuse hélicoïdale. En effet, la table d'aiguilletage arrête son alimentation en nappe après la coupe de la nappe, pendant l'aiguilletage de finition, pendant des opérations de contrôle de la préforme, et lors de l'évacuation de la préforme réalisée avant de reprendre un cycle complet. Le fonctionnement continu de la machine de formation de nappe est ainsi antagoniste avec le fonctionnement discontinu de la table d'aiguilletage.In the context of the industrialization of the production of annular textile preforms, it is generally intended to associate a helical fibrous web forming table (or spiral sheet) to the needling machine described above. In practice, the web forming table is positioned above the needling table and feeds it continuously into a helical fibrous web. However, if the web forming table has a continuous operation, the needling table discontinuously calls the helical fibrous web. Indeed, the needling table stops feeding the web after cutting the web, during finishing needling, during control operations of the preform, and during the evacuation of the completed preform before taking over complete cycle. The continuous operation of the web-forming machine is thus antagonistic with the discontinuous operation of the needling table.
La présente invention a donc pour but principal de proposer un procédé de formation par aiguilletage d'une préforme textile annulaire à partir d'une nappe fibreuse hélicoïdale qui ne présente pas les inconvénients précités et permet de s'accommoder des fonctionnements différents de la table de formation de nappe et de la table d'aiguilletage.The present invention therefore has the main object of providing a process for the needling formation of an annular textile preform from a helical fibrous web which does not have the aforementioned drawbacks and makes it possible to accommodate different operations of the web formation and the needling table.
Ce but est atteint grâce à un procédé de formation par aiguilletage d'une préforme textile annulaire à partir d'une nappe fibreuse hélicoïdale, comprenant successivement le déroulement d'une nappe fibreuse hélicoïdale depuis un plateau horizontal de formation de nappe animé d'une vitesse rotative NFS constante et prédéfinie sur un dérouleur intermédiaire horizontal animé d'une vitesse rotative NDI et positionné sur un plateau intermédiaire horizontal animé d'une vitesse rotative NFI, le déroulement de la nappe fibreuse hélicoïdale depuis le dérouleur intermédiaire vers un dérouleur horizontal final animé d'une vitesse rotative NDF, et le déroulement de la nappe fibreuse hélicoïdale depuis le dérouleur final vers un plateau horizontal de formation de préforme animé d'une vitesse rotative NFP variable et prédéfinie pour y subir un aiguilletage, les vitesses NDI, NFI et NDF étant pilotées de sorte que :
- NDF est proportionnelle à NFP ;
-
-
- N DF is proportional to N FP ;
-
-
L'invention est remarquable en ce qu'elle propose de réceptionner et de stocker la nappe fibreuse hélicoïdale produite en continu par la table de formation de nappe sur un dérouleur intermédiaire. En particulier, l'invention permet de stocker temporairement la nappe entre la table de formation de nappe et la table d'aiguilletage pour pallier aux vitesses de fonctionnement différentes entre ces deux tables. Ainsi, lorsque la table d'aiguilletage doit être arrêtée (par exemple pour évacuer une préforme réalisée), la nappe fibreuse hélicoïdale qui est produite en continu par la table de formation de nappe vient s'accumuler en spires superposées sur le dérouleur intermédiaire en attendant le démarrage d'un nouveau cycle de la table d'aiguilletage. Il n'est ainsi pas nécessaire d'arrêter le plateau de formation de nappe pendant l'arrêt du plateau de formation de préforme.The invention is remarkable in that it proposes to receive and store the helical fibrous web produced continuously by the web forming table on an intermediate unwinder. In particular, the invention allows temporary storage of the web between the web forming table and the needling table to overcome the different operating speeds between these two tables. Thus, when the needling table is to be stopped (for example to evacuate a preform made), the helical fibrous sheet which is continuously produced by the tablecloth forming table accumulates in coils superimposed on the intermediate unwinder pending starting a new cycle of the needling table. It is thus not necessary to stop the tablecloth during the stopping of the preform forming tray.
Plus précisément, avec le pilotage des vitesses NDI, NFI et NDF tels que définis selon l'invention, à chaque fois que la table d'aiguilletage est mise à l'arrêt, le plateau intermédiaire réalisera un tour complet tous les deux tours de nappes déroulées depuis le plateau de formation de nappe afin de stocker un tour de nappe sur le dérouleur intermédiaire ainsi qu'un autre tour de nappe enroulée dans le même sens sur le dérouleur final.More specifically, with the control of the speeds N DI , N FI and N DF as defined according to the invention, each time the needling table is stopped, the intermediate plate will perform a complete revolution both. web turns unrolled from the web forming plateau to store a web turn on the intermediate unwinder and another web turn wound in the same direction on the final unwinder.
Le plateau de formation de nappe et le plateau de formation de préforme ont avantageusement des vitesses moyennes respectives qui sont égales.The web forming plate and the preform forming plate advantageously have respective average speeds which are equal.
De préférence, NDF = k x NFP où k est un facteur constant ou variable prédéterminé correspondant à une régulation d'asservissement de la quantité de nappe fibreuse hélicoïdale dans une goulotte de régulation positionnée entre le dérouleur final et le plateau de formation de préforme.Preferably, N DF = k × N FP where k is a predetermined constant or variable factor corresponding to servo control of the amount of helical fibrous web in a control chute positioned between the final unwinder and the preform forming tray.
De préférence également, le procédé comprend en outre le comptage du nombre de tours de nappe fibreuse hélicoïdale déroulée sur le dérouleur intermédiaire. Ce comptage permet de gérer l'arrêt de la machine de formation de nappe si la quantité maximale (prédéterminée) de tours de nappe stockés sur le dérouleur intermédiaire est atteinte ou, inversement, un arrêt de la machine d'aiguilletage si le nombre de tours de nappe stockés sur le dérouleur intermédiaire atteint zéro.Also preferably, the method further comprises counting the number of turns of helical fibrous web unwound on the intermediate unwinder. This count makes it possible to manage the stopping of the web-forming machine if the maximum (predetermined) quantity of web turns stored on the intermediate unwinder is reached or, conversely, a stopping of the needling machine if the number of revolutions of tablecloth stored on the intermediate unwinder reaches zero.
De préférence encore, l'aiguilletage de la nappe fibreuse hélicoïdale est interrompu à chaque fin de cycle de formation d'une préforme textile annulaire pour permettre d'évacuer ladite préforme.More preferably, the needling of the helical fibrous sheet is interrupted at the end of each annular textile preform forming cycle in order to make it possible to evacuate said preform.
L'invention a également pour objet une machine d'aiguilletage circulaire pour la mise en oeuvre du procédé de formation d'une préforme textile annulaire à partir d'une nappe fibreuse hélicoïdale tel que défini précédemment, comprenant un plateau horizontal de formation de nappe destiné à former une nappe fibreuse hélicoïdale et animé d'une vitesse rotative NFS constante et prédéfinie, un plateau intermédiaire horizontal positionné sous le plateau de formation de nappe et animé d'une vitesse rotative NFI, un dérouleur intermédiaire horizontal positionné sur le plateau intermédiaire et animé d'une vitesse rotative NDI, un dérouleur horizontal final positionné sous le dérouleur intermédiaire et animé d'une vitesse rotative NDF, et un plateau horizontal de formation de préforme positionné sous le dérouleur final et animé d'une vitesse rotative NFP variable et prédéfinie.The invention also relates to a circular needling machine for implementing the method of forming an annular textile preform from a helical fibrous web as defined above, comprising a horizontal sheet-forming plateau intended to to form a helical fibrous web and animated with a constant and predefined rotary speed N FS , a horizontal intermediate plate positioned under the web forming plate and driven by a rotating speed N FI , a horizontal intermediate unwinder positioned on the intermediate plate and driven by a rotating speed N DI , a final horizontal unwinder positioned under the intermediate unwinder and animated with a rotational speed N DF , and a horizontal plateau forming preform positioned under the final unwinder and animated with a rotating speed N FP variable and predefined.
De préférence, la machine comprend en outre une goulotte de régulation du déroulement de la nappe fibreuse hélicoïdale positionné entre le dérouleur final et le plateau de formation de préforme.Preferably, the machine further comprises a flow control chute of the helical fibrous web positioned between the final unwinder and the preform forming plate.
Les dérouleurs intermédiaire et final peuvent comprendre chacun de deux portions courbes de convoyeur circulaire disposées en regard l'une de l'autre.The intermediate and final unwinders may each comprise two curved circular conveyor portions disposed opposite one another.
Le plateau de formation de préforme peut comprendre une tête d'aiguilletage animée d'un mouvement vertical de va-et-vient par rapport au plateau.The preform forming plate may comprise a needling head with a vertical movement back and forth relative to the plate.
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 :
- la
figure 1 est une vue schématique d'une machine d'aiguilletage circulaire pour la mise en oeuvre du procédé de formation d'une préforme textile annulaire selon l'invention ; et - la
figure 2 est un exemple de chronogrammes cycliques montrant les vitesses des différents éléments de la machine de lafigure 1 .
- the
figure 1 is a schematic view of a circular needling machine for carrying out the method of forming an annular textile preform according to the invention; and - the
figure 2 is an example of cyclic chronograms showing the velocities of the various elements of the machine of thefigure 1 .
La
Typiquement, une telle machine d'aiguilletage circulaire 2 comprend une table de formation de nappe 4 destinée à former une nappe fibreuse hélicoïdale (par exemple par tissage). Cette table de formation de nappe comprend notamment un plateau horizontal de formation de nappe 6 sur lequel est positionnée la nappe fibreuse 8 en cours de formation.Typically, such a
Le plateau de formation de nappe 6 est animé d'un mouvement de rotation autour d'un axe vertical 10. La formation de la nappe étant une opération pouvant être réalisée de façon continue à une même vitesse, le plateau de formation de nappe 6 est plus précisément animé d'un mouvement de rotation à une vitesse rotative NFS qui est constante et prédéfinie.The
La table d'aiguilletage circulaire 2 comprend également un dérouleur final 12 situé en-dessous de la table de formation de nappe 4, ce dérouleur final étant typiquement destiné à dérouler la nappe fibreuse 8 enroulée sur le plateau de formation de nappe 6 pour l'amener à l'aiguilletage.The circular needling table 2 also comprises a
Comme décrit plus en détails dans la publication
Le convoyeur circulaire 14 du dérouleur final 12 est piloté pour mettre la nappe fibreuse 8 en rotation autour de l'axe vertical à une vitesse rotative NDF.The
Sous le dérouleur final 12 est positionnée une table d'aiguilletage 16 qui est destinée à assurer un aiguilletage circulaire de la nappe fibreuse 8 déroulée depuis le dérouleur final.Under the
La table d'aiguilletage 16 est connue, par exemple de la publication
Au cours de cette rotation, la nappe fibreuse subit un aiguilletage par une tête d'aiguilletage (non représentée sur la
On notera que comme décrit dans la publication
La vitesse rotative NFP du plateau de formation de préforme 18 est par nature non constante puisqu'il est notamment nécessaire à la fin de chaque cycle de formation d'une préforme par aiguilletage (après l'aiguilletage d'un nombre prédéfini de couches de nappe fibreuse) de stopper la rotation du plateau pour évacuer la préforme avant de démarrer un nouveau cycle. En particulier, cette vitesse rotative NFP est une donnée prédéfinie qui est différente de la vitesse rotative NFS du plateau de formation de nappe 6.The rotary speed N FP of the
Selon l'invention, il est prévu de positionner sous le plateau de formation de nappe 6 un plateau intermédiaire horizontal 22 animé d'une vitesse rotative NFI, ce plateau intermédiaire 22 étant destiné à assurer un stockage temporaire d'un certain nombre de tours de nappe fibreuse 8 entre la machine de formation de nappe et la machine d'aiguilletage.According to the invention, provision is made to position a horizontal
Par ailleurs, toujours selon l'invention, un dérouleur intermédiaire horizontal 24 est positionné sur le plateau intermédiaire 22 et animé d'une vitesse rotative NDI. Comme pour le dérouleur final précédemment décrit, ce dérouleur intermédiaire comprend un convoyeur circulaire 26 pouvant être composé de deux portions courbes de convoyeur 26a, 26b qui sont chacune en forme de demi-disque et qui sont disposées en regard l'une de l'autre, le sens de rotation de ces portions courbes étant dirigé de sorte à faire réaliser un tour complet de 360° à la nappe fibreuse 8 autour de l'axe vertical 10.Furthermore, still according to the invention, a horizontal
Le pilotage de la machine d'aiguilletage circulaire selon l'invention, et notamment des vitesses rotatives des différents éléments qui la constituent, est le suivant.The control of the circular needling machine according to the invention, and in particular the rotational speeds of the various elements that constitute it, is as follows.
Comme indiqué précédemment, les vitesses NFS (du plateau de formation de nappe 6) et NFP (du plateau de formation de préforme 18) sont des variables d'entrées qui sont connues. Par ailleurs, ces plateaux 4, 18 ont des vitesses moyennes respectives qui sont égales.As previously indicated, the speeds N FS (of the web formation plateau 6) and N FP (of the preform formation plateau 18) are input variables that are known. Moreover, these
Quant aux vitesses NDI (dérouleur intermédiaire 24), NFI (plateau intermédiaire 22), et NDF (dérouleur final 12), elles sont pilotées de sorte à vérifier les équations de pilotage suivantes :
- (a) NDF est proportionnelle à NFP ;
- (b)
- (c)
- (a) N DF is proportional to N FP ;
- (B)
- (vs)
L'équation de pilotage (a) est une conséquence de la présence de la goulotte de régulation du déroulement de nappe 20 entre le dérouleur final et le plateau de formation de préforme. Plus précisément, cette équation équivaut à : NDF = k x NFP dans laquelle k est un facteur constant ou variable prédéterminé correspondant à une régulation d'asservissement de la quantité de nappe fibreuse hélicoïdale dans la goulotte de régulation.The control equation (a) is a consequence of the presence of the regulation channel of the unwinding of the
Les équations de pilotage (b) et (c) sont notamment destinées à assurer un stockage de plusieurs tours de nappe fibreuse sur le dérouleur intermédiaire sans contraindre la nappe fibreuse entre le dérouleur intermédiaire et le dérouleur final et sans contraindre la nappe fibreuse en sortie du plateau de formation de nappe.The control equations (b) and (c) are in particular intended to ensure storage of several turns of fibrous web on the intermediate unwinder without constraining the fibrous web between the intermediate unwinder and the final unwinder and without constraining the fibrous web at the exit of the tablecloth forming tray.
La
Plus précisément, cette figure montre un exemple de chronogrammes cycliques des vitesses NFP, NFS, NFI, et NDI vérifiant les équations de pilotage (a) à (c) selon l'invention.More precisely, this figure shows an example of cyclic chronograms of the speeds N FP , N FS , N F1 , and N DI satisfying the control equations (a) to (c) according to the invention.
Dans cet exemple, la vitesse NFS du plateau de formation de nappe est programmée pour être constante et égale à 6 tours/minute. De même, la vitesse NFP du plateau de formation de préforme est programmée pour varier de façon cyclique entre 0 et 10 tours/minute.In this example, the speed N FS of the tablecloth is programmed to be constant and equal to 6 rpm. Likewise, the speed N FP of the preform forming plate is programmed to vary cyclically between 0 and 10 rpm.
On notera qu'une vitesse NFP nulle correspond au temps d'arrêt du plateau de formation de préforme nécessaire pour évacuer la préforme une fois celle-ci achevée et pour réinitialiser la machine avant le redémarrage pour un nouveau cycle de formation. Ce temps d'arrêt est typiquement de l'ordre de 50s environ.It will be noted that a zero N FP speed corresponds to the stop time of the preform forming plate necessary to evacuate the preform once it has been completed and to reset the machine before restarting for a new training cycle. This downtime is typically of the order of 50s or so.
A partir de ces vitesses NFS et NFP prédéfinies, l'opérateur pilote les vitesses NDF, NFI et NDI pour qu'elles vérifient les équations (a) à (c) précitées. Les chronogrammes cycliques de ces vitesses vérifiant ces équations sont représentées sur la
Sur la
Ainsi, grâce à la présence du dérouleur intermédiaire, il est notamment possible de maintenir constante la vitesse NFS du plateau de formation de nappe malgré les arrêts du plateau de formation de préforme nécessaires pour évacuer les préformes à chaque fin de cycle et pour redémarrer ce plateau.Thus, thanks to the presence of the intermediate unwinder, it is in particular possible to keep the speed N FS of the tablecloth forming plate constant despite the stops of the preform forming plate necessary to evacuate the preforms at each end of the cycle and to restart this tray.
Claims (9)
- A method of forming an annular textile preform by needling a helical fiber sheet, the method comprising in succession:• unwinding a helical fiber sheet (8) from a horizontal sheet-forming turntable (6) driven at a constant and predefined speed of rotation NFS onto a horizontal intermediate unwinder driven at a speed of rotation NDI and positioned on a horizontal intermediate turntable (22) driven at a speed of rotation NFI;• unwinding the helical fiber sheet from the intermediate unwinder onto a final horizontal unwinder (12) driven at a speed of rotation NDF; and• unwinding the helical fiber sheet from the final unwinder onto a horizontal preform-forming turntable (18) driven at a variable and predefined speed of rotation NFP so as to be subjected to needling thereon;
- A method according to claim 1, wherein the sheet-forming turntable (6) and the preform-forming turntable (18) have respective mean speeds that are equal.
- A method according to claims 1 or 2, wherein NDF = k × NFP in which k is a predetermined constant or variable factor corresponding to regulating the servocontrol of the quantity of helical fiber sheet in a regulator chute (20) positioned between the final unwinder (12) and the preform-forming turntable (18).
- A method according to anyone of claims 1 to 3, further comprising counting the number of turns of helical fiber sheet unwound onto the intermediate unwinder.
- A method according to anyone of claims 1 to 4, wherein needling of the helical fiber sheet is interrupted at the end of each cycle of forming an annular textile preform, in order to enable said preform to be removed.
- A circular needling machine (2) for performing the method of forming an annular textile preform from a helical fiber sheet (8) according to anyone of claims 1 to 5, the machine comprising:• a horizontal sheet-forming turntable (6) for forming a helical fiber sheet and driven at a constant and predefined speed of rotation NFS;• a horizontal intermediate turntable (22) positioned under the sheet-forming turntable and driven at a speed of rotation NFI;• a horizontal intermediate unwinder (24) positioned on the intermediate turntable and driven at a speed of rotation NDI;• a final horizontal unwinder (12) positioned under the intermediate unwinder and driven at a speed of rotation NDF; and• a horizontal preform-forming turntable (18) positioned under the final unwinder and driven at a variable and predefined speed of rotation NFP.
- A machine according to claim 6, further comprising a regulator chute (20) for regulating the unwinding of the helical fiber sheet and positioned between the final unwinder (12) and the preform-forming turntable (18).
- A machine according to claims 6 or 7, wherein each of the intermediate (24) and final (12) unwinders comprises two curved circular conveyor portions (26a, 26b; 14a, 14b) arranged facing each other.
- A machine according to anyone of claims 6 to 8, wherein the preform-forming turntable has a needling head driven with vertical reciprocating motion relative to the turntable.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1758088A FR3070696B1 (en) | 2017-09-01 | 2017-09-01 | METHOD OF FORMING BY NEEDLETING AN ANNULAR TEXTILE PREFORM FROM A HELICOIDAL FIBROUS TABLET AND MACHINE FOR CARRYING OUT SAID METHOD |
Publications (2)
Publication Number | Publication Date |
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EP3450606A1 EP3450606A1 (en) | 2019-03-06 |
EP3450606B1 true EP3450606B1 (en) | 2019-10-16 |
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ID=60182745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18185322.7A Active EP3450606B1 (en) | 2017-09-01 | 2018-07-24 | Method of forming by needling an annular textile preform from a helical fibrous web and machine for implementing such a method |
Country Status (3)
Country | Link |
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US (2) | US11193223B2 (en) |
EP (1) | EP3450606B1 (en) |
FR (1) | FR3070696B1 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5546880A (en) * | 1994-12-29 | 1996-08-20 | The Bf Goodrich Company | Annular filamentary structures and methods of making |
FR2741634B1 (en) * | 1995-11-27 | 1998-04-17 | Europ Propulsion | PROCESS FOR THE REALIZATION OF FIBROUS PREFORMS INTENDED FOR THE MANUFACTURE OF ANNULAR PIECES IN COMPOSITE MATERIAL |
FR2757153B1 (en) * | 1996-12-17 | 1999-03-05 | Carbone Ind | PROCESS FOR MANUFACTURING PARTS, IN PARTICULAR BRAKE DISCS, OF CARBON-CARBON COMPOSITE MATERIAL |
WO2002068747A1 (en) * | 2001-02-26 | 2002-09-06 | Messier-Bugatti | Method and control device for advancing a needle punched fibrous sheet |
FR2824084B1 (en) | 2001-04-30 | 2003-08-01 | Messier Bugatti | NEEDLE FEEDER BY CONTINUOUS SPIRAL BAND |
US8377249B2 (en) * | 2009-04-03 | 2013-02-19 | The Procter & Gamble Company | Appraratus and method for providing a localized speed variance of an advancing substrate |
FR2954357B1 (en) | 2009-12-22 | 2012-03-23 | Messier Bugatti | CIRCULAR FILLING MACHINE WITH FIBROUS TABLET FEED BY A CONVEYOR AND A VERTICAL CHUTE |
US10406798B2 (en) * | 2014-03-31 | 2019-09-10 | Goodrich Corporation | Method to transport and lay down dry fiber bundles |
-
2017
- 2017-09-01 FR FR1758088A patent/FR3070696B1/en active Active
-
2018
- 2018-07-24 EP EP18185322.7A patent/EP3450606B1/en active Active
- 2018-08-23 US US16/110,143 patent/US11193223B2/en active Active
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2021
- 2021-11-16 US US17/455,129 patent/US11725318B2/en active Active
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None * |
Also Published As
Publication number | Publication date |
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US20220074095A1 (en) | 2022-03-10 |
FR3070696A1 (en) | 2019-03-08 |
US20190071804A1 (en) | 2019-03-07 |
FR3070696B1 (en) | 2019-09-13 |
US11193223B2 (en) | 2021-12-07 |
US11725318B2 (en) | 2023-08-15 |
EP3450606A1 (en) | 2019-03-06 |
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