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WO2000026012A1 - Appareil et procede destines a poser un renfort dans une preforme composite - Google Patents

Appareil et procede destines a poser un renfort dans une preforme composite Download PDF

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Publication number
WO2000026012A1
WO2000026012A1 PCT/US1999/025961 US9925961W WO0026012A1 WO 2000026012 A1 WO2000026012 A1 WO 2000026012A1 US 9925961 W US9925961 W US 9925961W WO 0026012 A1 WO0026012 A1 WO 0026012A1
Authority
WO
WIPO (PCT)
Prior art keywords
wire
fiber assembly
cutting
reinforcement
preform
Prior art date
Application number
PCT/US1999/025961
Other languages
English (en)
Inventor
Richard Nathan Olds
Christopher Feeney
Original Assignee
Gkn Westland Aerospace, Inc.
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 Gkn Westland Aerospace, Inc. filed Critical Gkn Westland Aerospace, Inc.
Priority to AU13416/00A priority Critical patent/AU1341600A/en
Publication of WO2000026012A1 publication Critical patent/WO2000026012A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure

Definitions

  • This invention relates to the production of fiber preforms for use in resin transfer molding and more particularly to an apparatus and method for incorporating metal wire reinforcement in a fiber preform.
  • a structural member 101 similar to an I-beam, has an upper flange 102 supported by a web 103.
  • Figure lb shows a cross-section of the member 101, which includes a first plurality of plies 104 and a second plurality of plies 105, which form the web 103, a third plurality of plies 106 placed over a top surface of the first and second plies, to form the flange 102.
  • a gap may be
  • a shaped unidirectional fiber preform 108 is used to fill the gap. This avoids the potential for fiber distortion, particularly when the resin is injected into the mold.
  • the shaped unidirectional fiber preform there still exists a potential problem after the part has been cured, as the junction still involves a transition region between the first, second, and third set of plies which is a potential area for initiating delamination.
  • One proposed method for strengthening this junction is to incorporate metal pins in the Z-axis direction, as illustrated in Fig. lb.
  • pins be of the proper length as producing parts in a resin transfer molding operation requires fairly precise net shaped molds, and it would be undesirable to have the pin ends contact or damage the mold surface.
  • an apparatus for inserting a reinforcement wire into a layered fabric assembly comprising means for directing a continuous wire in a selected direction into a layered fabric assembly, drive means for actuating the directing means, vibration means for vibrating the wire to facilitate entry of the wire into the layered fabric assembly, cutting means for cutting the wire and control means for actuating the drive means and vibration means such that the continuous wire is inserted to a selected depth in the fabric assembly and for actuating the cutting means.
  • a method for inserting the reinforcement wire into the layered fabric assembly would comprise providing a continuous wire, inserting the continuous wire into the layered fabric assembly to a selected depth while vibrating the wire, stopping the wire insertion and cutting the wire adjacent a top surface of the layered fabric assembly.
  • Fig. la is a view of a preform for an I-beam member; Fig. lb is a cross-section thereof.
  • Fig. 2a is an illustration of the apparatus according to the present invention
  • Fig. 2b is an enlarged view of the wire feed assembly.
  • Fig. 3a is an enlarged view of the cutter portion of the apparatus of Fig. 2
  • Fig. 3b is a view taken along the line 3b-3b thereof
  • Fig. 3c is a further enlarged view of the cutter portion.
  • Fig. 4 is an alternative embodiment of the present invention.
  • FIG. 2a an apparatus 1 for providing metal reinforcement in a layered fiber assembly known as a preform is shown.
  • the apparatus 1 has a spool 2 containing a continuous metal wire 3.
  • the wire 3 may be of any suitable size or type and be solid or stiff twisted strand wire.
  • solid metal wire made of stainless steel and having a diameter of about 0.020" may be used.
  • the invention is not limited by the type, size or composition of the wire and it is only necessary that a continuous strand of wire capable of being cut to length is used.
  • the wire 3 passes through a feed assembly 4 having two pairs of opposed tension rollers 5a and 5b, the wire being frictionally held by the rollers as it passes between the rollers.
  • each pair of opposed rollers are biased, by springs 5c, 5d or otherwise, into contact with each other, so as to grip the wire passing therebetween.
  • the degree of bias is normally adjustable so as to adapt to the size of the wire with sufficient bias being applied so as to avoid wire slippage.
  • the rollers 5a and 5b are driven by a motor 6 which is speed adjustable and also reversible.
  • the motor when actuated, causes the rollers to turn, thereby driving the wire forward.
  • a controller 7 is used to set the speed of the rollers and thus of the wire feed rate. It may be desirable to operate in the range of about 10 to 60" per minute.
  • the motor can be chosen to provide constant torque, that is, so that as resistance to travel increases the speed of the wire feed decreases to reduce the likelihood of buckling the wire. This may be particularly important when using the apparatus of the invention with fairly thick fiber preforms.
  • the apparatus further includes a manipulatable end 8 preferably mounted with an arm 9 which may fully articulate in any direction.
  • the end 8 has an ultrasonic horn 10 connected to an ultrasonic generator 11, the horn having a wire feed passage 12 in an end thereof.
  • the wire is preferably fed through one or more guides 13 as it makes its way to the end and then passes through the passage 12 in the horn.
  • the guide is a flexible smooth bore tube 13a, through which the wire passes, though other guides may be used.
  • the passage 12 leads to an opening 14 between a stationary cutter blade 15 and a movable cutter blade 16.
  • the movable cutter blade is pivotably mounted to the arm, the blade located at the end of a lever 17 which translates about a pivot 18.
  • a solenoid 19 acts on the lever and thus, upon a signal from the controller 7, causes the cutter blades to contact each other and thereby cut the wire which passes between the blades.
  • the wire as it passes through the horn, is vibrated which facilitates both the initial entry and the continuous passage of the wire into the fiber preform.
  • the ultrasonic generator may generate about 30KHz though of course, other frequencies may be used.
  • the horn may have a separate tip 10a which may be removable to allow tips with different diameter passages to be used, to adapt to different diameter wire. Close tolerances between the wire and the passage facilitate vibration transmission to the wire. Thus, with larger wire diameters, a horn with a corresponding larger passage diameter should be used.
  • the tip 10a is attached by threads to the horn to facilitate removal.
  • the end on the arm is placed against a top surface 20 of a preform 21.
  • the motor is actuated as is the ultrasonic generator.
  • the wire then is vibrated as it is driven by the rollers to pierce the preform.
  • the motor is stopped and the solenoid actuated to cause the movable blade to cut the wire substantially flush with the top surface of the preform.
  • custom sized pins can be rapidly and easily incorporated into a fiber preform in virtually any location.
  • the direction of pin insertion is readily controlled by simply adjusting the angle of the arm. Consequently, pins can be placed in a preform at from acute to oblique angles relative to the surface of the preform.
  • the length of the reinforcement wire pin can be determined in several ways. For certain parts, a single size or single pattern for a typical part can be developed and insertion made by controlling the number of turns of the motor relative to a specific location of the arm. Alternatively, a foot type assembly located on the opposite surface of the preform which senses either the proximity of the wire or contact with the wire can be used to stop the motor and possibly also to reverse the motor briefly to pull back the wire and thus avoid an end of the wire sticking through the preform. After the wire is cut, the arm is relocated to the next wire insertion point and the end repositioned for repeating the insertion method.
  • Such an apparatus substantially simplifies the insertion of metal reinforcement in fiber preforms, reducing labor costs and processing time while allowing pins of virtually any length to be inserted by simply adjusting a controller.
  • a single controller is envisioned for use with the apparatus of the invention, the controller used to actuate the direction, speed and torque of the motor which turns the feed rollers and also to actuate the solenoid which causes the wire to be cut.
  • the controller also is used to actuate the ultrasonic generator for vibrating the wire during insertion.
  • the controller is a computer that also directs the arm to position the end at the selected location, and to assure that the proper length pin is provided in that location. If sensors or a foot assembly are used with the apparatus for determining the depth of insertion into the preform, these are also integrated with the controller for stopping the insertion of the wire into the preform.
  • the end further includes a probe 22 fixed adjacent the cutter 16, the probe used to produce a pilot hole 23.
  • the probe being more rigid than the wire, first penetrates the preform. The probe is then withdrawn and retracted and the arm repositioned such that the wire insertion passage is directly over the hole made by the probe, the wire then inserted into the preform through the hole produced by the probe.
  • the probe has an extended length less than the thickness of the preform, but should be at least approximately 50% of the depth of the preform.
  • the probe may be retractable or extendible in response to a signal from the controller 7, and be engaged by an actuator 24. By producing an initial pilot hole, insertion of the wire into the preform is facilitated to reduce the likelihood that binding would occur.
  • Such an alternative embodiment may be particularly attractive with very thick preforms so as to increase the ability of the wire to traverse the entire thickness of the preform.
  • metal wire reinforcements can be readily and rapidly inserted in any direction, across a number of plies and thereby substantially increasing the strength at various junctures within a composite part. Such reinforcement thereby reduces the likelihood that delamination could occur and does so without a significant increase in processing time or expense.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

L'invention concerne un appareil (1) destiné à l'insertion directe d'un fil continu (3) dans une préforme de fibres (21) et au découpage du fil en longueur, le fil formant de préférence un renforcement sur l'axe Z dans la préforme. L'appareil comprend un moteur (6) qui entraîne des cylindres (5a, 5b) entre lesquels est alimenté le fil continu, le fil étant alimenté à travers un émetteur d'ultrasons (10) qui fait vibrer le fil pour faciliter son insertion dans une plate-forme de fibres. A mesure que le fil sort de l'émetteur, il passe par un dispositif de coupe (15, 16) qui n'est actionné qu'une fois que le film a atteint une longueur sélectionnée. Un contrôleur (7) contrôle le moteur et le générateur d'ultrasons et active également un solénoïde (18) qui agit sur le dispositif de coupe de manière à finaliser l'insertion du renfort dans la préforme de fibres. L'appareil de l'invention fournit un dispositif permettant d'automatiser l'insertion d'un renfort métallique dans une préforme de fibres, de réduire le coût de travail et le temps de traitement et de permettre en même temps d'utiliser des broches de renfort ayant pratiquement n'importe quelle longueur et n'importe quel angle.
PCT/US1999/025961 1998-11-04 1999-11-04 Appareil et procede destines a poser un renfort dans une preforme composite WO2000026012A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13416/00A AU1341600A (en) 1998-11-04 1999-11-04 Apparatus and method for providing reinforcement in a composite preform

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18634898A 1998-11-04 1998-11-04
US09/186,348 1998-11-04

Publications (1)

Publication Number Publication Date
WO2000026012A1 true WO2000026012A1 (fr) 2000-05-11

Family

ID=22684593

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/025961 WO2000026012A1 (fr) 1998-11-04 1999-11-04 Appareil et procede destines a poser un renfort dans une preforme composite

Country Status (2)

Country Link
AU (1) AU1341600A (fr)
WO (1) WO2000026012A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033120A1 (de) * 2007-07-13 2009-01-15 Evonik Röhm Gmbh Verbesserte Stumpfstoßverbindungen für Kernwerkstoffe
GB2539249A (en) * 2015-06-12 2016-12-14 Composite Tech And Applications Ltd Method of manufacturing a composite component
WO2016198301A1 (fr) * 2015-06-12 2016-12-15 Rolls-Royce Plc Procédé de fabrication d'un composant composite et installation de positionnement d'une tige de renfort
WO2016198308A1 (fr) * 2015-06-12 2016-12-15 Rolls-Royce Plc Procédé de fabrication de composant composite
EP4368379A1 (fr) * 2022-10-18 2024-05-15 Rolls-Royce plc Ensemble d'entraînement de tige

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2015299A1 (de) * 1969-04-01 1970-10-08 Rolls-Royce Ltd., Derby, Derbyshire (Grossbritannien) Verfahren und Vorrichtung zur Herstellung eines faserverstärkten Gegenstandes
GB2159460A (en) * 1984-05-29 1985-12-04 Europ Propulsion Method for the production of a multi-directional fibrous structure and device for carrying out said method
US5186776A (en) * 1990-05-07 1993-02-16 Foster-Miller, Inc. Composite laminate translaminar reinforcement apparatus and method
US5650229A (en) * 1994-12-13 1997-07-22 Dow-United Technologies Composite Products Inc. Shaped unidirectional fiber preforms

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2015299A1 (de) * 1969-04-01 1970-10-08 Rolls-Royce Ltd., Derby, Derbyshire (Grossbritannien) Verfahren und Vorrichtung zur Herstellung eines faserverstärkten Gegenstandes
GB2159460A (en) * 1984-05-29 1985-12-04 Europ Propulsion Method for the production of a multi-directional fibrous structure and device for carrying out said method
US5186776A (en) * 1990-05-07 1993-02-16 Foster-Miller, Inc. Composite laminate translaminar reinforcement apparatus and method
US5650229A (en) * 1994-12-13 1997-07-22 Dow-United Technologies Composite Products Inc. Shaped unidirectional fiber preforms

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033120A1 (de) * 2007-07-13 2009-01-15 Evonik Röhm Gmbh Verbesserte Stumpfstoßverbindungen für Kernwerkstoffe
GB2539249A (en) * 2015-06-12 2016-12-14 Composite Tech And Applications Ltd Method of manufacturing a composite component
WO2016198301A1 (fr) * 2015-06-12 2016-12-15 Rolls-Royce Plc Procédé de fabrication d'un composant composite et installation de positionnement d'une tige de renfort
WO2016198308A1 (fr) * 2015-06-12 2016-12-15 Rolls-Royce Plc Procédé de fabrication de composant composite
CN107912029A (zh) * 2015-06-12 2018-04-13 劳斯莱斯有限公司 制造复合部件的方法以及用于定位增强杆的设备
US10307973B2 (en) 2015-06-12 2019-06-04 Rolls-Royce Plc Method of manufacturing a composite component
EP4368379A1 (fr) * 2022-10-18 2024-05-15 Rolls-Royce plc Ensemble d'entraînement de tige

Also Published As

Publication number Publication date
AU1341600A (en) 2000-05-22

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