WO2017140752A1 - Procédé et dispositif pour produire des préformes tridimensionnelle lors de la production de pièces moulées renforcées par des fibres et préforme - Google Patents

Procédé et dispositif pour produire des préformes tridimensionnelle lors de la production de pièces moulées renforcées par des fibres et préforme Download PDF

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Publication number
WO2017140752A1
WO2017140752A1 PCT/EP2017/053454 EP2017053454W WO2017140752A1 WO 2017140752 A1 WO2017140752 A1 WO 2017140752A1 EP 2017053454 W EP2017053454 W EP 2017053454W WO 2017140752 A1 WO2017140752 A1 WO 2017140752A1
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WO
WIPO (PCT)
Prior art keywords
layer
draping
pull tab
layers
gripping
Prior art date
Application number
PCT/EP2017/053454
Other languages
German (de)
English (en)
Inventor
Matthias Graf
Original Assignee
Dieffenbacher GmbH Maschinen- und Anlagenbau
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 Dieffenbacher GmbH Maschinen- und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen- und Anlagenbau
Publication of WO2017140752A1 publication Critical patent/WO2017140752A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
    • 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
    • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
    • B29C70/202—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres arranged in parallel planes or structures of fibres crossing at substantial angles, e.g. cross-moulding compound [XMC]
    • 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
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/56—Tensioning reinforcements before or during shaping

Definitions

  • the invention relates to a method for the production of three-dimensional preforms.
  • the invention relates to a method for producing three-dimensional preforms in the course of the production of fiber-reinforced molded parts and preform
  • Fiber composite components called, in particular industrial use of the RTM process, resin transfer molding process, common practice. The whole
  • Manufacturing process to a usable plastic components consists of several subsequent individual processes. In a first
  • Process step near-net shape preforms / semi-finished fiber products are produced, which already have substantially the outer shape of the later plastic component.
  • preform process production of a preform
  • these preform process are usually several layers of fabric or fiber fabric, usually in two-dimensional form, stacked or possibly joined (sewing, welding, gluing), so that the
  • Fiber fabric stack substantially already the necessary outer contours and sometimes already special layers or layer thicknesses or local
  • a binder is introduced into the parting planes of the layers, which after reaching a reshaped three-dimensional shape and its activation and curing leads to a fixation of the layers to each other and the corresponding 3D contour (WO 2012 156 523 A1).
  • the fabric stacks are transferred to a forming tool and usually under (relatively low) pressure by closing the forming tool as far as the contour of the later molding approximated and cured by activation of the binder (heating and cooling), so that the semi-finished fiber
  • Fiber structure of the semifinished fiber product impregnated which includes fibers and binds firmly into the resin matrix.
  • the fiber-reinforced plastic component can be removed from the mold.
  • the production of semi-finished fiber already lays the foundation for success in the production of a plastic component.
  • fiber webs or webs are unwound from a roll and combined as required from a plurality of different fabrics or layers, shapes and sizes to form a fiber stack. It may be necessary to edit or cut the outer and possibly inner contour according to a pattern of the preform or the plastic molding. The pattern is generated from a development of the preform, or the final component. Preferably, the created, substantially flat fiber stack is then by means of a
  • Draping device draped, respectively in a three-dimensional preform formed (WO 2012 062 824 A1, WO 2012 062 825 A1, WO 2012 062 828 A1), wherein the draping a Drapierform, also referred to as a die, and to
  • Drapierstempel or Fixierstempel may be formed comprises.
  • a gripping device can be used for laying the fiber stack, as is also known from WO 2012 156 524 A1, for example, with the corresponding textile blanks being taken and attached to a surface of a molding tool, or on Further textile structures which are arranged on the mold, can be stored.
  • clamping frame with a plurality of clamping elements, which clamp the semi-finished fiber at its periphery on the periphery, wherein the clamping elements are individually vertically adjustable (DE 10 2013 008 697 A1). Also known is an adjustment of the clamping elements in the horizontal direction.
  • Draping multi-layered preforms into a complex 3D geometry can create unwanted wrinkles and waves in the preform.
  • the waves and wrinkles arise in practice, therefore, that, especially in the case of double-curved components, the extended lengths of the fibers are different over the surface and thereby a differentiated pulling takes place by parallel sliding of the fiber strands.
  • this is hampered by friction and suturing, create areas where the fibers are under tension, and areas where the fibers are under compressive stress.
  • the fiber layers above or below are also shifted, and thus changed in their fiber orientation.
  • the component properties are significantly weakened, which means that the components must be designed according to thick wall thicknesses.
  • DE 10 2012 024 060 A1 proposes to provide a clamping frame in which a layer of semi-finished fiber is peripherally clamped with a plurality of clamping elements, wherein the clamping elements are individually adjustable, so that for individual clamping elements a clamping force and a Clamping direction can be selected as needed.
  • a separate Einzelspannrahmen can also be provided for each layer, with the separate clamping of individual layers in
  • Tensioning frames are held and stretched, that the individual layers must be dimensioned correspondingly larger along its entire circumference, so that beyond the actual, desired contour, a corresponding edge of
  • clamping frames in particular clamping frames for each individual layer, often prove impractical when first a fiber stack is to be formed, which is to be transferred after training in a draping device. In this case, all clamping frames must be moved along with the fiber stack, which often makes handling difficult.
  • a method of making three-dimensional preforms in the course of the manufacture of fiber reinforced molded articles comprising: placing multiple layers of fibrous webs and / or fibrous webs to form a multi-layered web construction, and draping the web construction, wherein at least one layer, preferably multiple layers , particularly preferably all layers of the layer structure each have at least one pull tab, which is formed on a circumference of the respective layer so that the pull tab projects laterally beyond the layer structure after the at least one layer of fiber fabric and / or fiber fabric having a pull tab , was placed to form the ply structure, gripping the pull tab with a gripping device, wherein a tension is applied to each respective pull tab during draping by the gripping means.
  • the pull tabs allow that the individual layers of the layer structure can be used safely and automatically even after placing and placing the layers in the layer structure. It is therefore not necessary to provide a tenter, and it is not necessary to grasp and hold the individual layers already in the recording after cutting. At the same time allow the gripping means that engage the pull tabs that the individual layers can be manipulated individually in the direction of pull, point of attack, voltage level and timing, so that at appropriate periods during Drapiervorgangs the individual layers are drawn in a given, defined direction and / or defined tensile forces can be introduced. In addition, by the use of train lugs, which then generate targeted during draping a shear in the material, the transport of the situation
  • the multilayered ply structure has at least one ply-formed ply with a first fiber orientation placed between plys of at least one other fiber orientation, and during draping, the first fiber orientation ply with the first fiber orientation Pull tab the position of the first fiber orientation cross-gripping device is pulled in the direction of the fiber orientation or in a direction deviating from the fiber orientation.
  • the multi-layered layer structure at least one with a
  • the pull tabs are arranged so that they do not overlap in pairs or only partially, wherein an overlap is less than 40%, preferably less than 30%, more preferably less than 20%.
  • an overlap is less than 40%, preferably less than 30%, more preferably less than 20%.
  • the tension lugs extend circumferentially over a length of the circumference of the respective layer from 2 cm to 20 cm, preferably from 5 cm to 15 cm, particularly preferably from 5 cm to 10 cm, and / or that the pull tabs a Width, with which they laterally project from the layer structure, or from a scope of other layers of the layer structure, from 5 cm to 25 cm, preferably from 8 cm to 20 cm, particularly preferably from 10 cm to 15 cm.
  • the pull tabs are designed to be sufficiently large in order to be able to be gripped safely by a gripping device. At the same time the pull tabs are not or only slightly larger than necessary formed, so that achieved a correspondingly economical use of materials becomes. In particular, results in a significant material savings compared to the case that a layer is provided with an entire circumference of the situation comprehensive edge, as is customary for gripping with a tenter
  • the method may further include, for at least one pull tab, after gripping the pull tab, releasing the pull tab, and re-gripping the pull tab with the gripper tool. Since a secure gripping of the individual layers of the multilayer layer structure is possible by means of the present invention, it is now also possible to carry out the draping process in several stages, wherein in individual stages only individual layers and / or only individual deformations are performed, and wherein between different Drapiervorticiann also other edits or
  • the method may include that after gripping the pull tabs by means of the gripping means at least a first tensile force is exerted on at least one layer.
  • the tensile force in this case has a certain thickness, which is tuned to the process of draping and changeable, and a direction which may correspond to the fiber orientation or deviate from it. This can be specifically influenced on the draping and the
  • Drape and the preform to be produced are optimized.
  • At least a second tensile force is exerted on at least one layer. This can preferably on the same train flag or another
  • the second tensile force can also differ only in their strength and / or direction from the first tensile force.
  • the exertion of tensile forces on the at least one layer of relief phases, in which no tensile force acts on the situation is interrupted.
  • the tensile force can be adjusted or suspended accordingly.
  • the individual layers are conveyed by means of a vacuum gripping tool and / or with a
  • Tenter and / or a Beschreibablett and / or a feed belt and / or a needle gripper are placed.
  • the present invention allows the use of a variety of known technologies for placing fiber fabrics or fiber fabrics, with the respective known advantages and
  • the gripping devices for the pull tab can be arranged on a clamping frame.
  • the clamping frame can thus provide a certain basic tension of the situation and on the individual train flags can be selectively introduced a tensile stress during draping.
  • each layer has different contours and shapes. It is particularly preferably provided that each layer is provided and placed with such a shape and an outline that, after draping the multilayered layer structure, taking into account the respective, for the individual layers generally different stretching behavior, the draped layer structure essentially a having desired final shape for the preform to be produced. In this way it is possible to produce a preform with the least possible amount of material, and correspondingly the lowest possible material costs.
  • the method may be configured to form the multilayer ply assembly in a stacking device after forming the multilayer ply assembly into the multilayer ply assembly
  • Drapiervoriques is conveyed, which has a die, and that the
  • Draping takes place in the draping device, with one or more
  • Draping means in particular stamping the multilayer layer structure is pressed into the mold of the die.
  • the method may preferably be such that the multi-layered layer structure is formed on a shaped body defining a shape for the preform to be formed, and that draping is performed by the multilayer layer structure is molded onto the shaped body.
  • the present invention allows the use of various known technologies for placing and draping layers of fibrous webs or fibrous webs, with the respectively known advantages and advantages
  • the gripping devices are fixed to the draping device, preferably to the die or a draping means, in particular stamp.
  • the gripping means can be positioned in a particularly reliable manner relative to the draping means and moved relative to this, resulting in a very reliable draping with appropriate introduction of tensile stresses and / or tensile movements, and thus to a
  • the stamps can be designed in particular as a stamp for draping and / or stamp for fixing.
  • an apparatus for the production of three-dimensional preforms in the course of the production of fiber-reinforced molded parts is specified, which is particularly suitable performing a method as mentioned above, wherein the device comprises a draping device, wherein the draping device comprises a die, in which at least one layer preferably several layers of fiber fabrics and / or fiber layers can be deposited, wherein the
  • Draping device further comprises a plurality of traversable to the die Drapierstoff, in particular stamp, wherein between the die and the drawer movable draping means at least one layer, preferably several layers can be stored, wherein on at least one layer, preferably several layers, more preferably all layers a pull tab is formed which is arranged on a circumference of the relevant layer such that the pull tab laterally over the
  • Layer structure projecting out Furthermore, at least one gripping device for gripping the pull tab of a layer, wherein the gripping device is designed such that during the draping by means of the gripping means a tensile stress is applied to each respective pull tab.
  • the device further comprises a
  • Vacuum gripping tool and / or a clamping frame and / or a feed tray and / or a feed belt and / or a needle gripper for placing the layers in the draping device are known from the prior art tools for gripping layers of fiber fabrics and / or
  • Fiber beds are used such as needle grippers.
  • gripping tools as listed above can be arranged for placing the layers in the draping device.
  • the gripping means are on the
  • Draping device in particular on the die, arranged. It would also be conceivable here for the gripping devices to be arranged on a base plate of the draping device in order to allow increased flexibility in the setting of the gripping devices.
  • the gripping means are arranged on the draping means, in particular the punches.
  • the gripping devices can be particularly on
  • the stamps can be designed in particular as a stamp for draping and / or stamp for fixing.
  • the gripping means comprise jaws for clamping the pull tabs.
  • the jaws are provided with a zig-zag structure or groove-shaped structure transversely to the direction of pull and / or a non-slip surface, in particular made of an elastomer.
  • a safe Keep the pull tab in place in the jaw.
  • FIG. 1 shows a schematic representation of an industrial plant for the production of fiber-reinforced molded parts with a previous production of three-dimensional preforms
  • FIG. 2 shows a top view of an exemplary stack of layers of FIG
  • Fiber fabrics and / or fiber pads according to one embodiment
  • Fig. 3 shows an application of tensile forces by means of clamping devices on the
  • FIG. 5 shows a top view of an exemplary stack of layers of FIG
  • FIG. 1 the production of fiber-reinforced molded parts with a previous production of three-dimensional preforms will first be described in a schematic manner.
  • Fig. 1 is very highly schematic an industrial plant 1 can be seen, which ultimately for the production of a
  • the fiber reinforced molding 2 by means of an RTM process in a tool 3 in a press 4 is used.
  • the fiber-reinforced molding 2 is made of a produced in three-dimensional near net shape preformed preform 5, which has previously been produced in some schematically illustrated steps.
  • the starting base for the preform 5 is a fiber material, for example in the form of a fabric layer, a fiber fabric or the like. This can be made available, for example, as a roll product via an indicated roller 6.
  • a cutting device 7 is then cut by means of a cutter 8 from the roll a single layer of fiber fabric or fiber fabric or mat, which is not explicitly shown here.
  • a suitable transport device which is indicated in principle in the illustration of FIG. 1 only by curved arrows, an indicated device 9 is supplied, in which a binder is applied to the layer.
  • a binder is applied to the layer.
  • This can be done for example by spraying, rolling, dipping or the like.
  • the fiber material with a suitable binder
  • Cutting device 7 is afflicted with binder and the step of impregnation in the device 9 can be omitted. However, this is familiar to the person skilled in the art from the general state of the art, so that it need not be discussed further here. After the order of the binder, or if this step is omitted and the binder is already present in the fiber material, the situation reaches fiber fabric or
  • Fiber fabrics and / or fiber pads are stacked. It can also be a stapling, sewing or otherwise connecting the individual layers at locations where this is useful and necessary for design reasons, can be provided.
  • the layers of fiber fabric and / or fiber fabric typically have a near-net shape after cutting in the cutting device 7. Nevertheless, even after the stacking of the layers to the multi-layered layer structure 1 1 in the stacking device 10 further trimming, punching openings or the like can be made, if desired or necessary.
  • the multi-layered layer structure 1 1 After the multi-layered layer structure 1 1 is prepared in this way, in the exemplary embodiment shown here it enters a heating device 12, in which it, like indicated here, via a means of transport through an oven, a track with infrared radiation or the like is performed.
  • the multi-layered layer structure 1 1 is preheated and the typically thermally activated binder is activated or liquefied so that the multilayered layer structure 1 1 still has a high flexibility, but the processed in the multilayered layer structure 1 1 fiber fabric and / or Fasergelege on cooling each other be liable.
  • the heating means and the warming-up step may be dispensed with, and the multilayered layer structure 11 may be directly advanced to the next process step and later fed to a heater.
  • Draping device 13 transported.
  • the draping device 13 in this case has a die 14, which images the later form of the three-dimensionally preformed preform 5.
  • About stamp 15 for draping and / or fixing the multilayered layer structure 1 1 of fiber fabrics and / or fiber fabrics is now pressed into the shape of this die 14 and typically cools by the metallic material of the die 14, which is very good heat conducting and heat from the multilayer Layer structure 1 1 of the fabric layers or layers of gel dissipates, from.
  • the binder solidifies and there is the three-dimensionally preformed preform 5, which is already formed in its shape near net shape and the shape of the die 14 and the punch 15 follows.
  • the stamp 15 can be used, which hold the fiber material and / or it will in particular stamp 15 as
  • Drapierstempel used, which serve for moving the fiber material, for example, in the recesses of the die 14.
  • the stamps 15 may have different properties and be designed for draping and / or fixing.
  • the preform 5 is as far as dimensionally stable by the cured binder, that this, without losing its shape, at least further transported and optionally stored. However, the preform 5 has not yet reached its final shape and hardness, this is achieved only in the subsequent RTM process.
  • the thus pre-formed in the drapery 13 and ideally glued in it and cured multi-layer layer structure 1 1 then forms the Preform 5, which, as already described above, the press 4 for the RTM process can be supplied.
  • FIG. 2 shows a
  • FIG. 2 Top view of a multilayer sheet structure 11 formed, for example, by stacking a plurality of individual layers of fibrous web or fiber webs, cut to a particular desired shape and with a desired outline, for example, in the cutting device 7 of Figure 1 or otherwise placed.
  • an uppermost layer 21 can be seen, which is placed on a plurality of further layers 22, 23, 24, which in this example have substantially the same shape or contour as the layer 21 of fiber fabric or fiber fabric.
  • the individual layers 21, 22, 23, 24 have a different shape or different outline.
  • the pull tab 21 a is disposed at a position of the circumference of the layer 21, at a later time during the draping a tension in the layer 21 of fiber fabric or fiber fabric is to be introduced. Also, the pull tab 21 a is on the multi-layered layer structure 1 1, or defined by the other layers 22, 23, 24 on fiber fabric or fiber fabric in the multi-layered layer structure 1 1 contour outline laterally out, so that a gripping the pull tab 21 a to a later date is easily possible. As can also be seen in FIG. 2, further layers 22, 23, 24 in the multi-layered layer structure 11 are provided with corresponding pull tabs 22a, 23a and 24a, which are respectively disposed at corresponding positions on the circumference of the
  • the pull tabs 21 a, 22 a, 23 a and 24 a respectively arranged so that there are no overlaps of two or more
  • Pull tabs 21 a, 22 a, 23 a, 24 a comes. In this way, it is ensured that the pull tabs 21 a, 22 a, 23 a, 24 a can each be seized safely, without causing unintentional gripping of two pull tabs 21 a, 22 a, 23 a, 24 a with a gripping device comes. However, it is not necessary in all cases to ensure complete freedom from overlapping, and it can usually be sufficient that in each case a sufficiently large area of a pull tab 21 a, 22 a, 23 a, 24 a, for example at least 30% of the area of a pull tab, free from overlapping with other pull tabs 21a, 22a, 23a, 24a to allow safe gripping in this area.
  • FIG. 3 shows how each pull tab 21 a, 22 a, 23 a and 24 a gripped by means of a respective, associated gripping means 21 b, 22 b, 23 b and 24 b becomes.
  • the gripping devices 21b, 22b, 23b and 24b respectively have clamping jaws 21c, 22c, 23c and 24c, between which the
  • the jaws 21 c, 22 c, 23 c and 24 c may have a structure, such as a zig-zag structure or groove-shaped structure, which allows a secure gripping the layer 21, 22, 23, 24.
  • the surface structure of the jaw 21 c, 22 c, 23 c and 24 c, which directly with the layer 21, 22, 23, 24 comes into contact may have special properties.
  • Coating may be increased, for example with an elastomer, or the surface may have a structure with elevations.
  • draping by means of appropriate movement and / or otherwise actuation of the
  • Gripping devices 21 b, 22 b, 23 b and 24 b tensile stresses and tensile forces on the pull tabs 21 a, 22 a, 23 a and 24 a exercised and introduced via these in the respective layers 21, 22, 23, 24.
  • the tensile stresses and tensile forces are
  • Reinforcing blanks as layers 21, 22, 23, 24 are introduced into the multi-layered layer structure 1 1, which cover only a small part of the surface of the multilayer sheet structure 1 1, and - with the exception of one for this
  • Reinforcing blank provided pull tab 21 a, 22 a, 23 a, 24 a - not to the edge of the multi-layered layer structure 1 1 rich and not on this
  • Feeding behavior or a different shear characteristic during draping may have. This will be explained by way of example with reference to Figs. 4A to 4C.
  • Fig. 4 are exemplary results of numerical simulations for the Einfzugs concerned. Scher plausibleizing of layers of fibrous or fibrous fabrics during draping shown
  • Fig. 4A the pull-in or shear characteristic of a 0790 ° layer is shown
  • Fig. 4B the pull-in or shear characteristic of a 457-45 ° layer is shown
  • the layers were originally cut and provided as rectangular layers, and these are similarly draped over a shaped article, which is assumed to be approximately hemispherical by way of example.
  • the 0790 ° layer and the 457-45 ° layer have a significantly different pull-in or shear characteristic.
  • the draped and thus correspondingly stretched and drawn layers are then cut to the desired shape of the preform or the preform, as in Fig. 4C for The 0 90 ° position and shown in Fig. 4D for the 457-45 ° layer, resulting for the respective layers also correspondingly different cutting losses, which are cut off, as in Fig. 4E for the 0790 ° layer and in Fig. 4F for the 457-45 ° position shown.
  • the individual layers 21, 22, 23, 24 which are to form the multilayered layer structure 11 , so
  • Accept target form This may mean that at the time of cutting and placing the individual layers 21, 22, 23, 24 they may each have different shapes, and / or may have a shape and size which is at least partially smaller or larger than the size and shape of the preform to be formed.
  • FIG. 5 schematically shows an exemplary multi-layer layer structure 11 in a top view, in which the individual layers 21, 22, 23, 24 have different shapes, so that, as can be seen in FIG , a lower layer 22 laterally protrudes laterally beyond the uppermost layer 21 of the multilayered layer structure 11.
  • the individual pull tabs 21a, 22a, 23a and 24a continue to be freely accessible to be gripped by the gripping means 21b, 22b, 23b and 24b.
  • the individual layers 21, 22, 23, 24, taking into account the pull tabs 21 a, 22 a, 23 a, 24 a may be designed such that, after draping, after being draped, they are substantially the same after draping assume the desired target shape and thus the train flags are embedded in the later form.
  • the present invention can be used in a variety of ways and applied to a variety of known manufacturing processes. So it may, instead of as in Fig. 1 shown to form the multi-layered layer structure 11, for example as a fiber stack in a stacking device 10, which is provided separately from a drapery device 13, may also be possible that the multilayered layer structure 1 1 is formed on a shaped body defining a shape for the preform to be formed, and that the draping is carried out by the multilayer
  • the multi-layered layer structure 1 1 can first be completely formed before the draping takes place.

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

Abstract

L'invention concerne un procédé de fabrication d'ébauches tridimensionnelles lors de la production de pièces moulées renforcées par des fibres. Le procédé comprend les étapes consistant à : placer plusieurs couches (21, 22, 23, 24) de tissus fibreux et/ou de nappes de fibres pour former une structure multicouche (11) ; et draper la structure de couches. Au cours du procédé, au moins une couche de la structure de couches comprend au moins une tirette (21a, 22a, 23a, 24a), laquelle est formée au niveau d'une périphérie de la couche concernée de manière à faire saillie latéralement de la structure multicouche. Après le placement de la ou des couches faites de tissu fibreux et/ou de nappe de fibres, qui présentent une tirette, pour former la structure multicouche, la tirette est saisie au moyen d'un système de préhension (21b, 22b, 23b, 24b), et pendant le drapage, une contrainte de traction est appliquée sur la tirette au moyen du système de préhension. L'invention concerne en outre un dispositif de fabrication d'ébauches tridimensionnelles au cours de la fabrication de pièces moulées renforcées par des fibres, ainsi qu'une ébauche.
PCT/EP2017/053454 2016-02-16 2017-02-16 Procédé et dispositif pour produire des préformes tridimensionnelle lors de la production de pièces moulées renforcées par des fibres et préforme WO2017140752A1 (fr)

Applications Claiming Priority (2)

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DE102016102689.1 2016-02-16
DE102016102689.1A DE102016102689B4 (de) 2016-02-16 2016-02-16 Verfahren und Vorrichtung zur Herstellung von dreidimensionalen Vorformlingen im Zuge der Herstellung von faserverstärkten Formteilen und Vorformling

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WO2017140752A1 true WO2017140752A1 (fr) 2017-08-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3473397A1 (fr) * 2017-10-23 2019-04-24 Aleda SA Ensemble, système et procédé pour fabriquer une coque préformée
US11511501B2 (en) * 2019-10-07 2022-11-29 GM Global Technology Operations LLC Mold and method for molding a reinforced preform

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WO2019082055A1 (fr) * 2017-10-23 2019-05-02 Aleda Sa Ensemble, installation et méthode de fabrication d'une enveloppe préformée
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