EP1373622B1 - 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 PDF

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Publication number
EP1373622B1
EP1373622B1 EP02704894A EP02704894A EP1373622B1 EP 1373622 B1 EP1373622 B1 EP 1373622B1 EP 02704894 A EP02704894 A EP 02704894A EP 02704894 A EP02704894 A EP 02704894A EP 1373622 B1 EP1373622 B1 EP 1373622B1
Authority
EP
European Patent Office
Prior art keywords
needles
advance
fiber structure
speed
needling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02704894A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1373622A1 (fr
Inventor
Renaud Duval
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Landing Systems SAS
Original Assignee
Messier Bugatti SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messier Bugatti SA filed Critical Messier Bugatti SA
Priority claimed from PCT/FR2002/000694 external-priority patent/WO2002068747A1/fr
Publication of EP1373622A1 publication Critical patent/EP1373622A1/fr
Application granted granted Critical
Publication of EP1373622B1 publication Critical patent/EP1373622B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • 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
    • 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

Definitions

  • the invention relates to the needling of fibrous structures.
  • a particular, but not exclusive, field of the invention is the production of plates, sleeves or other fibrous needled preforms, for example of annular shape, used to form reinforcements of composite material parts.
  • a fibrous needle structure is advanced facing a set of needles carried by a needling head, and the needles are periodically introduced into the fibrous structure and then removed from it by conferring to the head needling movement back and forth in the direction transverse to the direction of advance of the structure.
  • the needling of superimposed fibrous layers ensures a Z-shaped transfer of fibers, that is to say transversely to the layers.
  • a continuous advance at constant speed is imposed on the fibrous structure, it moves transversely relative to the needles throughout the penetration time of the needles.
  • the imposed advance exerts a force on the needles that flex and can break.
  • their presence within the fibrous structure may be undesirable for later use.
  • Document is also known FR 2 729 404 an advance control method for a needling machine according to which the speed of rotation of the extraction rolls of the needle-punched fiber web is modulated, so that this speed of rotation takes different values for different needle positions. It is necessary to provide a variable speed roller drive system. In addition, this variation in speed does not take into account the instantaneous forces exerted on the needles.
  • the object of the invention is to propose a process for needling a fibrous structure that makes it possible to solve the problem of needle breakage 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 in advance exerted by the needles penetrating into the structure.
  • the decay of the feed speed can be absorbed by mechanical play in the transmission.
  • the motor being driven at a constant speed, the game, preferably elastic in nature, is automatically caught after the start of 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 engine, and then increases, after the beginning of the withdrawal of the needles, beyond the average advance speed.
  • a torque measurement of a drive member engaged with the fibrous structure may be effected 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 magnitude representative of the force exerted to drive the fibrous structure is measured, the driving speed of the fibrous structure is reduced when the measured quantity reaches or exceeds a first threshold value. , and, after the speed has been decreased, we increases the drive speed when the measured quantity becomes smaller than a second threshold value.
  • the second threshold value can be equal to or lower.
  • the measured quantity is for example representative of the torque exerted by a drive member of the fibrous texture.
  • the invention also aims to provide an installation for carrying out the method.
  • the Figures 1 and 2 show a fibrous structure needling apparatus 10 in the form of a plate.
  • the structure 10 is formed of two-dimensional layers stacked flat and needled to each other in order to bond the layers together and to give the plate delamination resistance.
  • the individual layers are, for example, strips of fabric or other two-dimensional texture such as, for example, a texture formed of unidirectional layers superimposed with different directions and linked together by light needling.
  • the layers are, for example, individually needled, a needling pass being made over the entire surface of the fibrous plate after each superposition of a new layer.
  • a needling pass being made over the entire surface of the fibrous plate after each superposition of a new layer.
  • the production of a needling pass after superposition of two or more layers, or even the realization of one or more needling passes after superposition of all the layers constituting the plate, are 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 located directly above a needling head 24.
  • a drive system 26 comprising at least one type of crank-handle assembly prints at the head needling 24 reciprocating vertical 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, in line with the needles 28.
  • the advance of the plate 10 is carried out by means of pairs of pressing rollers 40, 50 situated 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 performed by the rollers 52 and 54 applied with pressure towards each other while the roller 44 is disengaged, and possibly the roll 42.
  • the drive is performed by the rollers 42 and 44 applied with pressure towards each other, while the roller 54 is disengaged, and possibly the roller 52.
  • lower rollers 44, 54 may be replaced by conveyor belts, which can then also constitute the trays 12 and 14.
  • the penetration depth of the needles can extend over several thicknesses of superimposed strata. This depth can be adjusted according to the desired needling density distribution in the thickness of the plate.
  • the distance between the needling table 22 and the needling head is incrementally increased, after each superposition of a new stratum, by imposing a step of descent on the d-table. needling.
  • a similar descent step may be imposed on the trays 12 and 14, these, and the table 22 being mounted on a vertically movable common frame.
  • a slowing of the advance of the plate 10 is produced when the needles penetrate into the plate, in order to limit the bending force of the needles due to the advance of the plate and to eliminate or less minimize the risk of needle breakage.
  • the slowdown is produced directly by the penetration of the needles, exerting a braking force of the advance of the plate.
  • This can be achieved by introducing a mechanical clearance into the transmission between a drive motor and the pairs of pressure rollers.
  • the figure 3 shows a driving device of the pressure rollers comprising a motor 60 rotating at a constant speed and driving a belt 62 passing on the pressure rollers 42, 44 and 52, 54.
  • a driving device of the pressure rollers comprising a motor 60 rotating at a constant speed and driving a belt 62 passing on the pressure rollers 42, 44 and 52, 54.
  • the belt 62 passes on tension rollers 64 and 65, while on its path between the engine 60 and the upper pressure roller 52, the belt 62 passes on tension rollers 66 and return 67.
  • a double-sided toothed belt meshing with corresponding reliefs formed on the surfaces of the rollers in contact with the belt is preferably used.
  • the tension rollers 64, 66 are attached to the end of respective articulated lever arms 68, 70 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 may be in the form of springs or, preferably, pneumatic dampers.
  • the pressure in the pneumatic dampers is advantageously adjustable.
  • the figure 4 illustrates the variation over time of the speed of advance of the plate 10 when the plate moves from the plate 12 to the plate 14, or conversely, the curve C 1 showing the speed of the plate at the input of the needling station and the 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 thereof.
  • Curve A showing the movement of the needles between their high and low positions is also shown.
  • the difference between the input and output feed rates comes from needling. Due to the Z-fiber transfer, the measured speed of the non-needled upper layer upstream of the needling station is greater than that of the measured plate after needling.
  • the times t 1 and t 2 are those of the beginning of penetration of the needles into the plate and complete exit of the needles out of the plate. The difference ⁇ t between the times t 1 and t 2 depends on the penetration depth chosen for the needles.
  • the feedrate of the plate 10 varies continuously between a maximum greater than the average feedrate corresponding to the speed of the machine. motor, when the needles are out of the plate and a minimum below this average feed rate, when the needles are in the plate, without the advance being interrupted during the time interval between t 1 and t 2 .
  • the figure 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 entrance of the needling zone (curve D 1 ) and, on the other hand, at the exit of the zone d needling (curve D 2 ), as well as the movement of the needles (curve A). Moving in and out 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 1 , before reversing.
  • This can be explained by the longitudinal elastic deformation capacity of the ply, combined with the fact that, in the embodiment concerned, there is no use of stripper element, crowbar type applied to the plate during the penetration of the needles. Therefore, when the needles rise, they tend to slightly lift the plate before it is released and falls on 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 both pressure rollers which provide the drive.
  • the lengthening of the belt length between the motor and the driving pressure roller in response to the penetration of the needles results in a decrease in the measured torque which reflects the slowing down of the plate. It is then possible to control a slowing of the drive motor from a setpoint value in response when this torque decrease 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 pressure rollers to accelerate.
  • the detection of a torque increase is then used to increase the speed of the motor and bring it back to its set point.
  • the torque measurement is performed alternately on one pair of pressure rollers and on the other in the direction of movement of the plate.
  • the motor is driven at a constant but adjustable speed.
  • Controlling the speed of advance of the fibrous structure directly by the resistance in advance caused by the needles, by introducing an elastic game in the transmission has several advantages: it is self-adaptive, especially as and when stacking strata and increasing the thickness of the structure at the beginning of its constitution, and it allows to maintain a relatively high average advance speed 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 can be made from a measurement of a magnitude representative of the force exerted to drive it in motion.
  • Such a magnitude is for example the torque to be deployed to move the fiber texture.
  • This torque can be measured at a drive member, for example at the drive motor of the texture.
  • the figure 6 shows a training device that is different from that of the 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 the figure 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 taken by the motor.
  • the motor is for example a stepper motor controlled by a control circuit 80.
  • the motor 60 is initially controlled at a predetermined set speed V C (step 81). If the measured torque C M reaches or exceeds a maximum threshold value C max (test 82), the speed V M of the motor is decreased by an increment ⁇ V (step 83) and the test 82 is returned.
  • step 85 If the measured torque C M is less than C max (test 82), and if the speed V M of the motor is lower than the reference speed V C (test 84), the speed V M is increased by an increment ⁇ ' V equal or not to ⁇ V (step 85). On the other hand, if the speed V M is equal to or greater than V C , it is maintained or brought back to the value V C (return to step 81).
  • the advance resistance exerted by the needles causes an increase in the torque necessary to continue driving the fibrous texture to the set speed.
  • the speed is decreased by one increment as soon as the torque reaches the threshold C max .
  • Several successive decreasing increments may be necessary during needle penetration.
  • the speed can again be increased by one or more successive increments, when the torque C M becomes less than C max or the threshold C min , until reaching the setpoint again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Details Of Garments (AREA)
EP02704894A 2001-02-26 2002-02-26 Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee. Expired - Lifetime EP1373622B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0102555 2001-02-26
FR0102555A FR2821367B1 (fr) 2001-02-26 2001-02-26 Dispositif d'avance de plaque fibreuse aiguilletee
PCT/FR2002/000694 WO2002068747A1 (fr) 2001-02-26 2002-02-26 Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee.

Publications (2)

Publication Number Publication Date
EP1373622A1 EP1373622A1 (fr) 2004-01-02
EP1373622B1 true EP1373622B1 (fr) 2011-06-01

Family

ID=8860416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02704894A Expired - Lifetime EP1373622B1 (fr) 2001-02-26 2002-02-26 Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee.

Country Status (13)

Country Link
EP (1) EP1373622B1 (ko)
JP (1) JP4290988B2 (ko)
KR (1) KR100841485B1 (ko)
CN (1) CN1320190C (ko)
AT (1) ATE511561T1 (ko)
BR (1) BR0207504B1 (ko)
CA (1) CA2439238C (ko)
FR (1) FR2821367B1 (ko)
HU (1) HUP0303337A3 (ko)
IL (1) IL157421A0 (ko)
MX (1) MXPA03007567A (ko)
RU (1) RU2281351C2 (ko)
UA (1) UA76447C2 (ko)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2877019B1 (fr) * 2004-10-22 2007-04-06 Asselin Soc Par Actions Simpli Machine de consolidation a frappe alternative
KR101014126B1 (ko) 2008-06-02 2011-02-14 안태영 부직포 제조용 원단의 장력조절 자동화 장치
EP2479330B1 (de) * 2011-01-19 2013-12-18 Oskar Dilo Maschinenfabrik KG Vliesleger
CN107435187B (zh) * 2017-07-25 2019-05-28 常州大学 等静压联动三维针刺编织机
WO2020081348A1 (en) * 2018-10-15 2020-04-23 General Electric Company Systems and methods of automated film removal
CN111809310A (zh) * 2020-07-15 2020-10-23 唐贤律 一种超纤皮革针刺机
CN112301556A (zh) * 2020-11-18 2021-02-02 西安工程大学 一种双工位机器人针刺设备
CN115262077A (zh) * 2022-07-15 2022-11-01 山东奥达复合材料有限公司 一种碳纤维立体毡的自动化生产设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790052A (en) * 1983-12-28 1988-12-13 Societe Europeenne De Propulsion Process for manufacturing homogeneously needled three-dimensional structures of fibrous material
AT392297B (de) * 1987-10-01 1991-02-25 Fehrer Textilmasch Nadelvorrichtung zum herstellen einer gemusterten filzbahn
JP2823910B2 (ja) * 1989-12-21 1998-11-11 日本フエルト株式会社 ニードルフェルトの製造システム
FR2729404B1 (fr) * 1995-01-12 1997-04-11 Asselin Aiguilleteuse et procede de commande d'avance associe
DE69611308T2 (de) * 1995-10-24 2001-07-12 Jimtex Developments Ltd., Rochdale Hin-und herbewegung der nadel
DE19702692A1 (de) * 1996-02-19 1997-11-06 Fehrer Ernst Verfahren und Vorrichtung zum Vernadeln einer Vliesbahn

Also Published As

Publication number Publication date
CN1494616A (zh) 2004-05-05
CA2439238C (en) 2008-11-04
RU2003126179A (ru) 2005-02-27
RU2281351C2 (ru) 2006-08-10
FR2821367B1 (fr) 2004-01-30
EP1373622A1 (fr) 2004-01-02
BR0207504A (pt) 2004-07-27
ATE511561T1 (de) 2011-06-15
KR20040025665A (ko) 2004-03-24
JP4290988B2 (ja) 2009-07-08
CA2439238A1 (en) 2002-09-06
CN1320190C (zh) 2007-06-06
UA76447C2 (en) 2006-08-15
FR2821367A1 (fr) 2002-08-30
JP2004522871A (ja) 2004-07-29
BR0207504B1 (pt) 2012-01-24
KR100841485B1 (ko) 2008-06-25
HUP0303337A2 (hu) 2004-01-28
IL157421A0 (en) 2004-03-28
HUP0303337A3 (en) 2008-08-28
MXPA03007567A (es) 2004-10-15

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