WO2002068747A1 - Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. - Google Patents
Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. Download PDFInfo
- Publication number
- WO2002068747A1 WO2002068747A1 PCT/FR2002/000694 FR0200694W WO02068747A1 WO 2002068747 A1 WO2002068747 A1 WO 2002068747A1 FR 0200694 W FR0200694 W FR 0200694W WO 02068747 A1 WO02068747 A1 WO 02068747A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- needles
- fibrous structure
- advance
- speed
- needling
- Prior art date
Links
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
- 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
Definitions
- the invention relates to the needling of fibrous structures.
- a particular, but not exclusive, field of the invention is the production of needled plates, sleeves or other fibrous preforms, for example of annular shape, usable for constituting reinforcements of parts made of composite material.
- a fibrous structure to be needled is advanced opposite a set of needles carried by a needling head, and the needles are periodically introduced into the fibrous structure and then removed therefrom, conferring on the head needling a return movement in a transverse direction relative to the direction of advance of the structure.
- the applications envisaged in the aforementioned patent are brake discs or diverging nozzles of rocket engines, these applications requiring materials having good mechanical properties and the ability to keep them at high temperatures.
- the needling of superimposed fibrous layers ensures a transfer of fibers in Z, that is to say transversely to the layers.
- a structure is thus obtained which has less inhomogeneity and increased resistance to delamination, that is to say increased resistance to separation between layers due to shearing forces such that they can in particular be exerted on discs. of brake.
- the needling head In order to perform needling on the entire surface of the fibrous structure, the latter is advanced opposite a needling head.
- a needling head When the needling is carried out on each new superimposed layer, an advance movement is carried out each time a new layer is put in place so that the entire surface of the last superimposed layer is described by the needling head.
- Document FR 2 729 404 also discloses a feed control method for a needling machine according to which the speed of rotation of rollers for extracting the sheet of needled fibers is modulated, so that this speed of rotation takes on different values. for different needle positions. It is necessary to provide a variable speed roller drive system. In addition, this speed variation does not take into account the instantaneous real forces exerted on the needles. Subject and summary of the invention
- the object of the invention is to propose a needling process for a fibrous structure which makes it possible to solve the problem of breaking needles without significantly penalizing the speed of the process, even in the case of thick structures.
- the decrease in the speed of advance is caused directly by the resistance to advance exerted by the needles entering the structure.
- the decrease in the speed of advance can be absorbed by mechanical play in the transmission.
- the motor being driven at constant speed, the play, preferably of an elastic nature, is automatically taken up after the start of the withdrawal of the needles.
- the speed of advance of the structure decreases during the penetration of the needles below a value of average speed of advance corresponding to the speed of the motor, and then increases, after the beginning of the withdrawal of the needles, beyond the average feed speed.
- a measurement of the torque of a drive member engaged with the fibrous structure can be carried out so as to decrease the speed of the motor when the torque decreases below a threshold, reflecting a slowing down of the fibrous texture.
- a quantity representative of the force exerted to drive the fibrous structure is measured, the drive speed of the fibrous structure is reduced when the measured quantity reaches or exceeds a first threshold value , and, after the speed has been reduced, we increases the drive speed when the measured quantity becomes less than a second threshold value.
- the second threshold value can be equal or lower.
- the quantity measured is for example representative of the torque exerted by a member for driving the fibrous texture.
- the invention also aims to provide an installation allowing the implementation of the method.
- an installation comprising a needling head carrying a plurality of needles, a device for driving the needling head to impart an alternating movement to the needles, a support of fibrous structure to be needled situated opposite of the needling head and a device for driving the fibrous structure for imparting thereto a forward movement on said support, installation in which, according to the invention, the device for driving the fibrous structure is arranged to allow a momentary decrease in the speed of advance of a fibrous structure carried by the support in response to the resistance to advance exerted by the needles during their penetration within the fibrous structure, without completely interrupting the advances throughout the duration of the needles presence in the fibrous structure.
- FIG. 1 is a very schematic perspective view of a needling installation
- Figure 2 is a very schematic partial view, on an enlarged scale, in side elevation and in section, of the installation of Figure 1;
- FIG. 3 is a very schematic view of a drive device for achieving the advance of a fibrous structure during needling in an installation such as that of Figures 1 and 2, according to a mode of setting work of the invention
- - Figure 4 is a curve illustrating the variation over time of the speed of advance of a fibrous structure during needling, in the case of the embodiment of Figure 3;
- FIG. 5 is a curve illustrating the movement of a fibrous structure during needling, in the case of the embodiment of Figure 3;
- FIG. 6 is a very schematic view of a device for driving a fibrous structure during needling, according to a second embodiment of the invention
- - Figure 7 is a flowchart showing the process of controlling the drive of the fibrous structure according to the second embodiment of the invention.
- FIGS. 1 and 2 show an installation for needling a fibrous structure 10 in the form of a plate.
- the structure 10 is formed of two-dimensional strata stacked flat and needled to each other in order to bond the strata together and to give the plate resistance to delamination.
- the individual layers are, for example, strips of fabric or other two-dimensional texture such as, for example, a texture formed of unidirectional sheets superimposed with different directions and linked together by light needling.
- the strata are for example individually needled, a needling pass being carried out over the entire surface of the fibrous plate after each superposition of a new layer.
- a needling pass after superposition of two or more layers, or even the realization of one or more needling passes after superimposition of all the layers making up the plate, fall within the scope of the present invention. .
- the plate 10 during needling is moved horizontally through a needling station 20, between a first support plate 12 and a second support plate 14 located on either side of the needling station.
- the plate is moved alternately in one direction and in the other, from the plate 12 to the plate 14 and vice versa.
- the plate passes over a needling table 22 situated directly above a needling head 24.
- a drive system 26 comprising at least one rod-crank type assembly prints on the head needling 24 a vertical reciprocating movement under the control of a motor (not shown).
- the needling head 24 extends over the entire width of the plate 10 and carries a plurality of needles 28.
- the holes 22a are formed in the table 22, directly above the needles 28.
- the advancement of the plate 10 is achieved by means of pairs of pressure rollers 40, 50 located between the needling table 22 and, respectively, the plates 12 and 14.
- the rollers 42 , 44 and 52, 54 are rotated, at least one of the rollers of each pair being disengageable, for example the lower roller 44, 54.
- the drive is produced by the rollers 52 and 54 applied with pressure towards each other while the roller 44 is disengaged, as well as possibly the roller 42.
- the drive is carried out by the rollers 42 and 44 applied with pressure towards each other, while the roller 54 is disengaged, as well as possibly the roller 52.
- lower rollers 44, 54 may be replaced by conveyor belts, which can then also constitute the plates 12 and 14.
- a new layer is superimposed and a new needling pass is carried out by moving the plate 10 towards the other plate 14 or 12.
- the needles 28 penetrate vertically into the plate 10.
- the penetration depth of the needles 28 into the plate 10 is a function of the position of the needling head, at one end of the vertical stroke, relative to the needling table 22.
- the penetration depth of the needles can extend over several thicknesses of superimposed strata. This depth can be adjusted according to the distribution of needling density desired in the thickness of the plate.
- the distance between the needling table 22 and the needling head is increased in increments, after each superposition of a new layer, by imposing a step of descent on the table d needling.
- a similar descent step can be imposed on the plates 12 and 14, these, as well as the table 22 being mounted on a common frame movable vertically.
- a slowing down of the advance of the plate 10 is produced when the needles penetrate the plate, in order to limit the bending force of the needles due to the advance of the plate and to eliminate or minimize the risk of needle breakage.
- FIG. 3 shows a device for driving the pressure rollers comprising a motor 60 rotating at constant speed and driving a belt 62 passing over the pressure rollers 42, 44 and 52, 54.
- the belt 62 passes over tension 64 and deflection rollers 65, while, on its path between the motor 60 and the upper pressure roller 52, the belt 62 passes over tension 66 and deflection rollers 67.
- rollers on which it passes preferably a double-sided toothed belt meshing with corresponding reliefs formed on the surfaces of the rollers in contact with the belt.
- the tension rollers 64, 66 are fixed to the end of respective arms 68, 70 forming articulated levers subjected to an elastic restoring force exerted by respective devices 72, 74, so as to keep the belt 62 permanently tensioned.
- the devices 72, 74 exerting an elastic restoring force can be in the form of springs or, preferably, pneumatic shock absorbers.
- the pressure in the pneumatic shock absorbers is advantageously adjustable.
- the plate 10 In the case where the plate 10 is moved from the plate 14 to the plate 12, the plate is driven by the pressure rollers 42, 44, while the lower roller 54 at least is disengaged from the side of the press 50.
- the motor 60 rotates in the direction indicated by the arrow F r.
- the needles enter the plate 10 the latter is slowed down by the needles, which causes a reduction in the speed of rotation of the rollers 42, 44.
- the belt 62 is delivered at constant speed by the motor 60, the length of belt between the motor 60 and the roller 42 becomes longer. This elongation is absorbed by the tension roller 64 under the action of the elastic return exerted by the damper 72 which pivots the lever 68 in the direction indicated by the arrow F.,.
- FIG. 4 illustrates the variation over time of the speed of advance of the plate 10 when the plate moves from the plate 12 towards the plate 14, or vice versa, the curve C, showing the speed of the plate at the input of the station d 'needling and curve C 2 the output speed.
- the speed can be measured by means of a sensor carrying a wheel resting on the plate and driven in rotation by the advance of the latter.
- Curve A showing the displacement of the needles between their high and low positions is also shown.
- the difference between the input and output feed rates comes from the needling. Due to the transfer of fibers in Z, the measured speed of the non-needled upper layer, upstream of the needling station is greater than that of the plate measured after needling.
- the times t 1 and t 2 are those of the beginning of penetration of the needles into the plate and of the complete exit of the needles from the plate. The difference ⁇ t between times t 1 and t 2 depends on the penetration depth chosen for the needles.
- the speed of advance of the plate 10 varies continuously between a maximum greater than the average speed of advance corresponding to the speed of the motor, when the hands are out of the plate and a minimum lower than this average advance speed, when the hands are in the plate, without the advance being interrupted during the time interval between t 1 and t 2 .
- FIG. 5 shows curves which illustrate the displacement of the plate as a function of time, measured on the one hand on the last layer at the input of the needling zone (curve D.,) and, on the other hand, at the output of the needling area (curve D 2 ), as well as the movement of the needles (curve A).
- the displacement in entry and in output is measured by a sensor providing a signal representative of the length of advance of the plate.
- the feed continues to increase after the time t r before reversing.
- This can be explained by the capacity for longitudinal elastic deformation of the ply, combined with the fact that, in the embodiment concerned, a stripper element, of the crowbar type applied to the plate, is not used. needle penetration. Consequently, when the needles are raised, they tend to lift the plate slightly before it releases and falls back onto the needling table.
- the slowing down of the plate can be detected by measuring the torque at the end of the shaft of one or two pressure rollers which provide the drive.
- the lengthening of the belt length between the motor and the drive pressure roller in response to the penetration of the needles results in a reduction in the measured torque which reflects the slowing down of the plate. It is then possible to control a slowing down of the drive motor from a setpoint in response when this reduction in torque reaches a certain threshold, which adds to the effect of the elastic play in the transmission to react quickly to the resistance to advance exerted by the needles.
- the shortening of the belt causes the drive pressure rollers to accelerate.
- the detection of an increase in torque is then used to increase the speed of the motor and bring it back to its set value.
- the torque measurement is carried out alternately on a pair of pressure rollers and on the other according to the direction of movement of the plate.
- the motor is driven at constant but adjustable speed.
- the command to decrease the speed of advance of the fibrous structure directly by the resistance to advance caused by the needles, by introducing elastic play in the transmission has several advantages: it is self-adapting, in particular as and when the stacking of strata and the increase in thickness of the structure at the start of its constitution, and it makes it possible to maintain a relatively high average speed of advance since the acceleration of the advance, when the needles are out of the structure, compensates for the slowdown caused by the penetration of the needles.
- control of the speed of advance of the fibrous structure may be carried out on the basis of a measurement of a quantity representative of the force exerted to drive the latter in displacement.
- Such a magnitude is for example the torque to be deployed to displace the fibrous texture.
- This torque can be measured at a drive member, for example at the texture drive motor.
- Figure 6 shows a drive device which differs from that of Figure 3 by the absence of elastic play.
- the motor 60 drives the pressure rollers 42-44 and 52-54 by means of return rollers 65, 67 and 64 ', 66', the latter having a fixed axis, unlike the rollers 64, 66 of FIG. 3.
- a sensor (not shown) provides a signal S c representative of the torque C M exerted by the motor 60, for example by measuring the current drawn by the motor.
- the motor is for example a stepping motor controlled by a control circuit 80. As shown in FIG. 7, the motor 60 is controlled at the start at a predetermined reference speed Vc (step 81).
- the speed V M of the motor is reduced by an increment ⁇ V (step 83) and we return to test 82. If the measured torque C M is lower than C ma ⁇ (test 82), and if the motor speed VM is lower than the set speed Vc (test 84), the speed VM is increased by an increment ⁇ 'V equal or not to ⁇ V (step 85). On the other hand, if the speed VM is equal to or greater than Vc, it is maintained or reduced to the value Vc (return to step 81). Alternatively, as shown in broken lines in the figure
- the speed can again be increased by one or more successive increments, when the torque CM becomes less than
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- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0207504-0A BR0207504B1 (pt) | 2001-02-26 | 2002-02-26 | método, e, instalação de perfurar uma estrutura de fibra através de uma agulha. |
EP02704894A EP1373622B1 (fr) | 2001-02-26 | 2002-02-26 | Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. |
HU0303337A HUP0303337A3 (en) | 2001-02-26 | 2002-02-26 | Method and control device for advancing a needle punched fibrous sheet |
AT02704894T ATE511561T1 (de) | 2001-02-26 | 2002-02-26 | Verfahren und antriebsanordnung für die vorschubbewegung eines nadelvlies |
CA002439238A CA2439238C (fr) | 2001-02-26 | 2002-02-26 | Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. |
JP2002567639A JP4290988B2 (ja) | 2001-02-26 | 2002-02-26 | ニードル刺し込み繊維プレートの前進を制御する方法および設備 |
IL15742102A IL157421A0 (en) | 2001-02-26 | 2002-02-26 | Method and installation for controlling the advance of a needled fiber plate |
UA2003087996A UA76447C2 (en) | 2001-02-26 | 2002-02-26 | Method and control device for advancing a needle punched fibrous sheet |
KR1020037011080A KR100841485B1 (ko) | 2001-02-26 | 2002-02-26 | 바늘작업되는 섬유판의 전진을 제어하는 방법 및장치 |
MXPA03007567A MXPA03007567A (es) | 2001-02-26 | 2002-02-26 | Metodo y dispositivo de control para que avance una placa fibrosa perforada por agujas. |
US10/153,475 US6568050B2 (en) | 2001-02-26 | 2002-05-22 | Method and installation for advancing a needled fiber plate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/02555 | 2001-02-26 | ||
US89951701A | 2001-07-05 | 2001-07-05 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US89951701A Continuation | 2001-02-26 | 2001-07-05 |
Publications (1)
Publication Number | Publication Date |
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WO2002068747A1 true WO2002068747A1 (fr) | 2002-09-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2002/000694 WO2002068747A1 (fr) | 2001-02-26 | 2002-02-26 | Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. |
Country Status (1)
Country | Link |
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WO (1) | WO2002068747A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2877019A1 (fr) * | 2004-10-22 | 2006-04-28 | Asselin Soc Par Actions Simpli | Machine de consolidation a frappe alternative |
EP3031968A1 (fr) * | 2014-12-11 | 2016-06-15 | Trützschler GmbH & Co. KG | Procede de commande d'une aiguilleuse |
EP3450606A1 (fr) * | 2017-09-01 | 2019-03-06 | Safran Landing Systems | Procede de formation par aiguilletage d'une preforme textile annulaire a partir d'une nappe fibreuse helicoidale et machine pour la mise en oeuvre d'un tel procede |
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US4790052A (en) * | 1983-12-28 | 1988-12-13 | Societe Europeenne De Propulsion | Process for manufacturing homogeneously needled three-dimensional structures of fibrous material |
FR2621333A1 (fr) * | 1987-10-01 | 1989-04-07 | Fehrer Textilmasch | Dispositif a aiguilleter pour fabriquer une bande de feutre a motifs |
JPH03193921A (ja) * | 1989-12-21 | 1991-08-23 | Nippon Felt Co Ltd | ニードルフェルトの製造システム |
FR2729404A1 (fr) * | 1995-01-12 | 1996-07-19 | Asselin | Aiguilleteuse et procede de commande d'avance associe |
WO1997015708A1 (fr) * | 1995-10-24 | 1997-05-01 | Jimtex Developments Limited | Aiguille animee d'un mouvement alternatif |
FR2745012A1 (fr) * | 1996-02-19 | 1997-08-22 | Fehrer Ernst | Procede et dispositif d'aiguilletage d'une bande de matelas de fibres |
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2002
- 2002-02-26 WO PCT/FR2002/000694 patent/WO2002068747A1/fr active Application Filing
Patent Citations (6)
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US4790052A (en) * | 1983-12-28 | 1988-12-13 | Societe Europeenne De Propulsion | Process for manufacturing homogeneously needled three-dimensional structures of fibrous material |
FR2621333A1 (fr) * | 1987-10-01 | 1989-04-07 | Fehrer Textilmasch | Dispositif a aiguilleter pour fabriquer une bande de feutre a motifs |
JPH03193921A (ja) * | 1989-12-21 | 1991-08-23 | Nippon Felt Co Ltd | ニードルフェルトの製造システム |
FR2729404A1 (fr) * | 1995-01-12 | 1996-07-19 | Asselin | Aiguilleteuse et procede de commande d'avance associe |
WO1997015708A1 (fr) * | 1995-10-24 | 1997-05-01 | Jimtex Developments Limited | Aiguille animee d'un mouvement alternatif |
FR2745012A1 (fr) * | 1996-02-19 | 1997-08-22 | Fehrer Ernst | Procede et dispositif d'aiguilletage d'une bande de matelas de fibres |
Non-Patent Citations (1)
Title |
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DATABASE WPI Section Ch Week 199140, Derwent World Patents Index; Class F01, AN 1991-291847, XP002182336 * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2877019A1 (fr) * | 2004-10-22 | 2006-04-28 | Asselin Soc Par Actions Simpli | Machine de consolidation a frappe alternative |
WO2006045931A1 (fr) * | 2004-10-22 | 2006-05-04 | Asselin-Thibeau | Machine de consolidation a frappe alternative |
EP3031968A1 (fr) * | 2014-12-11 | 2016-06-15 | Trützschler GmbH & Co. KG | Procede de commande d'une aiguilleuse |
CN105696202A (zh) * | 2014-12-11 | 2016-06-22 | 特吕茨施勒有限及两合公司 | 用于控制针刺机的方法 |
CN105696202B (zh) * | 2014-12-11 | 2018-08-17 | 特吕茨施勒有限及两合公司 | 用于控制针刺机的方法 |
EP3450606A1 (fr) * | 2017-09-01 | 2019-03-06 | Safran Landing Systems | Procede de formation par aiguilletage d'une preforme textile annulaire a partir d'une nappe fibreuse helicoidale et machine pour la mise en oeuvre d'un tel procede |
FR3070696A1 (fr) * | 2017-09-01 | 2019-03-08 | Safran Landing Systems | Procede de formation par aiguilletage d'une preforme textile annulaire a partir d'une nappe fibreuse helicoidale et machine pour la mise en oeuvre d'un tel procede |
US11193223B2 (en) | 2017-09-01 | 2021-12-07 | Safran Landing Systems | Method of forming an annular textile preform by needling a helical fiber sheet, and a machine for performing such a method |
US11725318B2 (en) | 2017-09-01 | 2023-08-15 | Safran Landing Systems | Method of forming an annular textile preform by needling a helical fiber sheet, and a machine for performing such a method |
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