WO2015007353A2 - Procédé de fabrication d'un élément de construction en matériau composite à base de fibres - Google Patents

Procédé de fabrication d'un élément de construction en matériau composite à base de fibres Download PDF

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Publication number
WO2015007353A2
WO2015007353A2 PCT/EP2014/001483 EP2014001483W WO2015007353A2 WO 2015007353 A2 WO2015007353 A2 WO 2015007353A2 EP 2014001483 W EP2014001483 W EP 2014001483W WO 2015007353 A2 WO2015007353 A2 WO 2015007353A2
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary material
resin
preform
flowable
component
Prior art date
Application number
PCT/EP2014/001483
Other languages
German (de)
English (en)
Other versions
WO2015007353A3 (fr
Inventor
Swen Zaremba
Patrick STEIB
Original Assignee
Technische Universität München
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 Technische Universität München filed Critical Technische Universität München
Publication of WO2015007353A2 publication Critical patent/WO2015007353A2/fr
Publication of WO2015007353A3 publication Critical patent/WO2015007353A3/fr

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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
    • B29C70/28—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
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082—Mechanical anchoring
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B29C37/0082—Mechanical anchoring
    • B29C37/0085—Mechanical anchoring by means of openings in the layers
    • 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
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • 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
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/76—Moulding on edges or extremities of the preformed part
    • B29C70/763—Moulding on edges or extremities of the preformed part the edges being disposed in a substantial flat plane
    • 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
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding

Definitions

  • the invention relates to a method for producing a component from a fiber composite material, wherein a preform comprising a dry fiber skeleton in a cavity of a tool is inserted, wherein the dry fiber skeleton is soaked in the cavity with a flowable resin, and wherein the preform after impregnation of the Fiber skeleton is cured with the resin to the component.
  • Fiber composites are produced by a labor-intensive and cost-intensive process.
  • the fiber composite material consists of a proportion of fibers and a proportion of matrix, which is formed from the resin, wherein the material is formed during processing.
  • it is customary, for example, to produce a dry preform with a fiber structure that comes close to the final contour of the component prior to the gathering of resin and fibers, for example by infusion or injection.
  • This preform is also referred to as preform.
  • the production of a preform takes place, inter alia, by the layering of planar semi-finished fiber products which can be pressed under pressure and temperature into a shape similar to a final geometry. After impregnation of the fiber skeleton of the preform with resin, the resin is cured to form the finished component.
  • RTM Resin Transfer Molding
  • CONFIRMATION COPY closing the resin is cured, for example by means of a heat treatment by heat treatment, whereby the finished component is formed from the fiber composite material. Due to the combined production steps, the RTM process has clear cost and logistics advantages over other processes, with impregnation and deformation of the preform taking place in separate process steps.
  • thermosets can be used, which can also be composed of several components. Typical representatives are epoxy-vinyl-polyester and phenolic-based resin systems. These have a hardening reaction which takes place at room or higher temperatures.
  • This object is achieved by a method for producing a component from a fiber composite material, wherein a preform comprising a dry fiber skeleton in a cavity of a tool is inserted, wherein between the inserted preform and the tool an auxiliary material is introduced, wherein the dry fiber skeleton in the In the case of the impregnation of the fiber skeleton, the flow path of the resin is influenced by the auxiliary material, and wherein the preform is cured after the impregnation of the fiber skeleton with the resin to the component.
  • the invention recognizes in a first step that undesirable deviations in the filling pattern from the desired final state, in particular due to variations in the resin flow during the impregnation of the preform, are the cause of a high fluctuation in the quality of the finished component or for a high reject rate ,
  • the invention is based on the consideration that the resin flow during the impregnation of the preform into a desired defined resin flow through feed lines or sprue channels and into an undesired undefined resin flow can be decomposed by nonspecific cavities dependent on external circumstances and manufacturing tolerances.
  • an undesired resin flow can lead to flow around partial areas of the preform, so that residual air contained therein is prevented from being transported to the outside.
  • the invention proceeds from the further consideration that an unwanted and undefined resin flow can be prevented by introducing an auxiliary material into the cavities, gaps or channels which cause the undefined resin flow, or with an auxiliary material introduced the flow of resin during impregnation of the preform is controlled in a controlled manner.
  • the cause of an unwanted resin flow is prevented by a filling of non-specific cavities, gaps or channels.
  • the resin can no longer flow into the auxiliary material-filled cavities, gaps or channels.
  • the auxiliary material is used as a filler.
  • the auxiliary material is used as a guide aid, for example as a barrier, as a barrier or as a membrane. Both options are not necessarily alternatives, but can be combined with each other in any form or present in a mixed training.
  • auxiliary material between the inserted preform and the tool specifically influences the unwanted flow of resin in the space between the preform and the tool and in an edge region of the preform.
  • the invention is based on the targeted use of the effect of so-called race tracking (RTR) in order to reduce the fluctuation range in the parameters of the finished component compared to the fluctuation range of the input variables for the production of the component.
  • RTR race tracking
  • the term "race tracking” here means the flow of resin through a cavity in a closed cavity.
  • the invention deliberately prevents resin flow through and / or into unspecific cavities in the intermediate space between the inserted preform and the tool and in an edge region of the preform, thus achieving an improvement in the quality of the finished component.
  • an undesired resin flow may also occur in an edge region of the preform.
  • Such an edge region of the preform is, for example, by the region of expiring fiber layers or by a Radien Scheme given.
  • overcompaction may occur there due to friction or pressure conditions.
  • the stabilization over the hardening resin then freezes the resulting geometrical deviation.
  • an undesired channel can form on the outside or on the inside of the edge region, which in turn leads to an undesirable resin flow.
  • unwanted pure resin areas caused thereby may also arise in the finished component. This effect is also reduced by the invention.
  • inserts are also used in the tool for the realization, which in turn can be the cause of undesired resin channels. These channels distribute the resin further in the tool and thus also lead to deviations in the component from the desired flow pattern and thus in the filling pattern of the finished component. This undesirable deviation is also prevented by the invention.
  • the method described above specifies a robust production process for a component made of a fiber composite material, the scrap rate being reduced compared to the known state of the art.
  • the input variables of the preform can be given a large tolerance window, in particular with regard to the geometric dimensions, the thicknesses, the compaction states, etc. Despite a wide tolerance window of the input parameters, the quality of the impregnation process is not or only insignificantly influenced.
  • the introduction of the auxiliary material and the impregnation of the fiber skeleton can take place successively in time, offset in time or parallel in time.
  • the process step of introducing the auxiliary material begins before the process step of the impregnation.
  • the process step of introducing the auxiliary material and the process step of the impregnation overlap in time. Due to the given combination possibilities of introducing the auxiliary material and impregnating the fiber skeleton with resin, different characteristics arise for the manufacturing process, which can be used for further optimization.
  • the process time for the impregnation process can be shortened or influenced by the introduction of the auxiliary material, the filling image of the resin.
  • a flowable and, in particular, hardening auxiliary material is preferably introduced as auxiliary material.
  • auxiliary material for example, thermoplastics or thermosets are used. Thermoplastics do not cure in the true sense, but consolidate at correspondingly low temperatures, so that terms such as curing or curing rate in terms of meaning include a consolidation or consolidation rate.
  • the process properties and / or the material properties of the auxiliary material can be favorably adjusted for a respective desired application by the addition of non-reactive and / or reactive fillers or auxiliaries.
  • a component can be produced, wherein the material and / or process properties in the resin-impregnated fiber structure, in particular in the component interior, differ from the material or process properties of the auxiliary material, in particular at the component edge.
  • metallic particles can be added to the auxiliary material in order to modify the electrical properties of the auxiliary material introduced into the component and thus in particular on and / or in an edge of the component.
  • a flowable auxiliary material In order to close RTR channels as a cause for undefined resin flow, it is advantageous to use for a flowable auxiliary material a material having a higher curing rate than the resin of the matrix, for which purpose if appropriate reactive and / or non-reactive fillers can be added.
  • the viscosity of the auxiliary material may differ from the viscosity of the resin of the matrix.
  • auxiliary material By a higher viscosity and / or by a higher curing rate of the auxiliary material can also be achieved that the auxiliary material only insignificantly penetrates into the fiber structure of the preform.
  • penetration of the auxiliary material into an edge region of the preform may also be desirable if, for example, a surface contour is to be produced by the auxiliary material for the finished component and, in this case, remains permanently as a surface on the component.
  • Both the flowable resin and the flowable auxiliary material are preferably introduced into the cavity of the tool or into the fiber skeleton of the preform by means of a pressure difference, that is to say by an injection or by an infusion.
  • a pressure difference that is to say by an injection or by an infusion.
  • separate inlets are expediently introduced into the cavity for the flowable auxiliary material and for the flowable resin.
  • this is not necessarily required depending on the process control.
  • the same inlet may also be used for the auxiliary material and for the resin if the auxiliary material corresponds to the resin material and both process steps do not overlap in time.
  • auxiliary material In the case of a flowable auxiliary material, it may be desirable to close the channels causing undesirable resin flow as quickly as possible, but otherwise to allow the flow of auxiliary material into the fiber framework as close as possible, ie with a predictable depth of penetration, or to stop rapidly. Accordingly, a relatively low viscosity would be desired to fill an undesired channel for the auxiliary material. For a penetration into the fiber structure, however, the highest possible viscosity for the auxiliary material would be preferable.
  • the difference in the range of an undesirable Channel and the fiber skeleton lies in their respective geometric expression. There is a relatively large channel in the RTR area.
  • the fiber framework requires a complex structure to be filled.
  • the complex geometry in the fiber framework leads to an enlarged surface and thus to an increased friction surface.
  • a higher velocity gradient and thus a higher shear rate are induced in the fiber skeleton compared to an RTR range.
  • This difference can be preferably used to control the penetration depth of the flowable auxiliary material by using a shear-setting auxiliary material. If such a shear-setting flowable auxiliary material is used, as the shear rate increases, as it were, thickening of the material takes place. In a RTR channel, a low-viscosity impregnation takes place via a low shear rate.
  • reactive and / or non-reactive fillers and / or auxiliaries which are capable of lowering the (flow) speed of the auxiliary material relative to the preform by means of increased friction are added to the flowable auxiliary material. This also reduces the flow of the auxiliary material into the fiber structure of the preform in the desired manner. In addition, the cavity in the area to be filled itself is reduced with the fillers used. Powdery auxiliaries and / or fillers or fiber materials are preferably added to the auxiliary material.
  • fillers and / or auxiliaries which accelerate the curing of the auxiliary material can also be added to the flowable auxiliary material, as already mentioned.
  • the penetration depth of the auxiliary material into the fiber skeleton of the preform can be set in a defined manner.
  • the flowable auxiliary material penetrates into an edge region in the fiber skeleton of the preform and connects there permanently with this.
  • auxiliary material is to be provided as an outer contour, there is in particular the possibility of selecting a material such that the remaining auxiliary material satisfies the component requirements in the edge region.
  • requirements for the edge region of the component are, in particular, with regard to the impact resistance to which
  • a specific functionalization of the component can be achieved.
  • Targeted can be achieved on the auxiliary material, which remains on the component, also a functional extension.
  • a local component increase can be provided via the design of the RTR area.
  • a material build-up by the auxiliary material can take place deliberately in an edge region by creating an RTR channel.
  • the auxiliary material can be removed from the finished component. But it can also remain permanently on / in this.
  • a barrier layer is introduced as auxiliary material.
  • a barrier layer is used in particular in addition to a flowable auxiliary material.
  • the barrier layer prevents penetration of the flowable auxiliary material into the fiber skeleton of the preform.
  • a barrier layer a nonwoven fabric, a woven fabric, a felt, a paper or other material, in particular having a low permeability or impermeable substance can be used.
  • powdery materials in the form of a bed in particular a thermoplastic powder, glass particles or other solid particles in question.
  • An advantage of flat materials is that they can be produced or applied over the existing textile preform technology.
  • the advantage of particulate materials is that their proportion can be locally modified and thus locally a defined expression of the flow of the auxiliary material can be achieved in the fiber structure.
  • barrier layer can be further suitably introduced for liquids impermeable or partially permeable solid.
  • a barrier layer can be further suitably introduced for liquids impermeable or partially permeable solid.
  • a textile or formed by powder materials locks may also be provided a profile of a plastic, a metal or other solid.
  • the barrier layer provides an area for controlling or controlling the penetration depth of the flowable auxiliary material and characterizes a transmittance deviating from the remainder of the component.
  • the barrier layer completely blocks the flow of the auxiliary material, slows it to a standstill or shortens the penetration depth of the flowable auxiliary material in the fiber structure by restricting the flow.
  • a solid body used as a barrier layer is used in the form of a profile enclosing an edge region of the preform.
  • the enclosure of the edge region of the preform serves in particular to connect the profile by a frictional, force or material closure with the dry fiber material.
  • a functionalization in the direction of a final contour of the finished component may be possible.
  • the barrier layer or the solid body can also be provided with a separating property relative to the fiber skeleton, so that it is possible to remove the barrier layer with little effort from the cured component.
  • a material may be, for example, PTFE or silicone.
  • the solid body used as a barrier layer can also be designed with a number of openings in order to allow a defined penetration of the auxiliary material.
  • the barrier layer is not used as such for controlling a flowable auxiliary material, but is used in particular exclusively for controlling the resin flow (resin in the sense of the matrix material).
  • the sprue through the resin and thus the filling pattern in the component can be designed defined.
  • the RTR regions or RTR channels are preferably designed specifically for controlling the flow of resin, as a result of which the flow front of the resin into the fiber structure is controlled via the barrier layer.
  • the openings or openings in the barrier layer or in the solid state used can be configured in any desired form or as complete interspaces between different barrier layers.
  • Such a barrier layer for controlling the flow of resin itself can, for example, prevent penetration of resin into the fiber structure of the preform on the sprue side.
  • the resin By means of an RTR design in the intermediate space between the preform and the tool, the resin can be forced to first flow around the preform and then penetrate into the dry fiber structure via, for example, targeted openings.
  • a defined design of the flow front and thus a defined impregnation of the preform with resin can also be achieved via a partial permeability of the barrier layer for the resin with or without targeted breakthroughs.
  • a sealing polymer is introduced as auxiliary material.
  • a seal in the cavity of the tool plays a crucial role in the RTM process. Namely, it prevents the unwanted escape of resin during impregnation or during curing. Leaks during soaking result in an undesirable bypass flow from the cavity. Thereby the flow pattern is changed within the component and it also creates a resin accumulation outside the tool.
  • Usual materials for a seal used in the cavity of the tool are elastomers. Metal seals have not proven to be useful for the RTM process because of the required tolerances.
  • a sealing polymer is used for the auxiliary material, then this can be used as a redundancy for an already existing sealing function and thereby in particular significantly extend its service life.
  • the auxiliary material in this case serves as a resin barrier.
  • Suitable sealing polymers for the auxiliary material are polyurethanes or silicones.
  • blowing agents for foaming the auxiliary material can additionally be used.
  • internal stresses are generated in the auxiliary material.
  • the auxiliary material expands during the manufacturing process and is thereby pressed against the tool.
  • a chemical shrinkage in the auxiliary material can be compensated.
  • FIG. 2 shows possibilities for processing the method steps of introducing an auxiliary material and impregnating with resin in an RTM process
  • FIG. 3 schematically shows the resulting flow front during an RTM process.
  • Fig. 5 shows schematically different profile shapes for a barrier layer
  • Fig. 6 shows schematically in an RTM process the resulting flow front of
  • Resin when using a barrier layer as an auxiliary material when using a barrier layer as an auxiliary material.
  • FIG. 1 schematically shows the introduction of a flowable auxiliary material 14 for influencing the resin flow for an RTM process.
  • the time track t runs from top to bottom.
  • a preform 1 with a dry fiber structure 2 is inserted into the cavity 3 of a tool 4.
  • the tool 4 has an inlet 7 and an outlet 8.
  • the outlet 8 for the resin 15 is optional.
  • the tool 4 has an inlet 9 and an outlet 10 for introducing a flowable auxiliary material 14.
  • the outlet 10 for the auxiliary material 14 is optional. So that the preform 1 can be inserted into the cavity 3 of the tool 4, a negative tolerancing with respect to the cavity 3 of the tool 4 is required in terms of its geometric shape. This creates a tolerance of and dependent on the process step of inserting the preform 1 gap 11 between the inserted preform 1 and the tool 4. About this to some extent unspecific gap 11 can during the impregnation resin 15 flow undefined, causing the filling image of the preform. 1 is affected.
  • a flowable auxiliary material 14 is introduced between the preform 1 and the tool 4 via the inlet 9 before the impregnation process begins. Since the gap 11 is spatially larger in size compared to the pores, interspaces and cavities within the precompacted fiber structure 2 of the preform 1, the flowable auxiliary material 14 is initially preferably distributed in this gap 11 and does not yet penetrate into the fiber structure 2 of the preform 1 , Ideally, the flowable auxiliary material 14 fills the gap 11 between the preform 1 and the tool 4, with little or no penetration into the preform 1. Subsequently, the auxiliary material 14 hardens (it is used a curing resin system). The gap 11 is now completed.
  • a flowable resin 15 is injected into the preform 1 at a later time via the inlet 7. Since the intermediate space 11 between the preform 1 and the tool 4 is filled or closed by the cured auxiliary material 14, the introduced flowable resin 15 results in a defined distribution within the fiber skeleton 2 of the preform 1. The resulting filling image is of RTR channels in FIG Interspace 11 not affected.
  • FIG. 2 shows various options for arranging or processing the method steps 20 for introducing the auxiliary material and 22 for impregnation with resin for an RTM method.
  • the auxiliary material before introduced impregnation with resin and this process step 20 also terminated before the process step 22 of the drinking.
  • the process step 20 of introducing the auxiliary material is not yet complete when the impregnation process 22 starts with resin.
  • the beginning of the process step 20 for introducing the auxiliary material shifts progressively in the direction of the process step 22 of impregnation with resin.
  • FIGS. 2e) and 2f the introduction speed or the flow of the auxiliary material and the duration of the method step 20 for introducing the auxiliary material are varied.
  • a flowable auxiliary material 14 is schematically shown in the fiber structure 2 of the preform 1 according to the method shown in Fig. 1.
  • this penetrates further into the fiber skeleton 2 of the preform 1 as on the opposite side on the side of the outlet 10.
  • the auxiliary material 14 comes first in contact with the fiber skeleton 2. Only after distribution over the gap 11 reaches the auxiliary material 14 after flowing around the preform 1 whose back.
  • the penetration depth of the auxiliary material 14 shown in FIG. 3 is purely schematic and does not correspond to the actual conditions.
  • the penetration depth can be and also influence the shape of the flow front 24 of the auxiliary material 14 in the preform 1.
  • FIG. 4 schematically shows the possibilities for influencing the penetration depth of the auxiliary material 14 by means of a barrier layer 27 for a preform 1 with a fiber stack 25.
  • a barrier layer 27 On the left side of the preform 1, an intermediate space 11 or a defined predetermined RTR area 26 is shown in each case, which is first filled with flowable auxiliary material 14.
  • a barrier layer 27 is introduced in each case. In this case, their permeability for the auxiliary material 14 of Fig. 4a) to 4c) increases.
  • a barrier layer 27 is introduced, which is not penetrable for the auxiliary material 14. As a result, auxiliary material 14 does not reach the barrier layer 27 or the dry fiber stack 25 from the RTR region 26.
  • the barrier layer 27 has a certain permeability for the flowable auxiliary material 14.
  • the barrier layer 27 is designed, for example, as a fleece or as a woven fabric.
  • the barrier layer 27 has a further increased permeability for the flowable auxiliary material 14 compared with FIG. 4 b).
  • the auxiliary material 14 has penetrated into the region of the fiber stack 25 up to a certain penetration depth.
  • FIG. 5 shows examples of blocking layers 28 designed as solid bodies.
  • the barrier layer 28 has a U-shaped profile.
  • the profile of the barrier layer 28 is formed in Fig. 5b) H-shaped.
  • the profile of the barrier layer 28 is cap-shaped.
  • the barrier layer 28 in the form of a fixed profile encloses the fiber stack 25 of the preform 1 in an edge region. By this enclosing, the barrier layer 28 or the corresponding profile can be connected to the fiber stack 25.
  • the cap-shaped profile according to FIG. 5c) can be used in particular for the design of a final contour of the finished component and, to that extent, remain firmly and permanently on the component.
  • FIG. 6 schematically illustrates, for an RTM method, the provision of a barrier layer 28 made of a solid body, for example of metal, which is used here for defined control of the flow front of the resin 15 of the matrix.
  • the barrier layer 28 is rendered permeable to some extent by introducing holes for the resin 15. Between the preform 1 and the tool 4 in each case an enclosing barrier layer 28 is introduced, which has a reduced permeability in Fig. 6a) compared to Fig. 6b).
  • Flowable resin 15 is introduced into the cavity of the tool 4 via the inlet 7. Over the outlet 8 excess resin can be removed.
  • the surrounding barrier layer 28 forces injected resin 15 to initially substantially flow past the preform 1.
  • the resin 15 with a defined flow front 24 penetrates into the fiber skeleton 2 of the preform 1 via openings 30 in the barrier layer 28 attached to the rear side (see FIG. 6 a)). About the arrangement and the shape of the openings 30, the flow front 24 can be set defined.
  • the resin in contrast to FIG. 6a), can penetrate into the preform 1 to a certain extent over an edge region.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Reinforced Plastic Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément de construction en matériau composite à base de fibres. On place une ébauche (1) comprenant une armature en fibres (2) sèche dans une empreinte (3) d'un outil (4), on introduit une matière auxiliaire (14) entre l'ébauche (1) mise en place et l'outil (4), on imprègne l'armature en fibres (2) sèche dans l'empreinte (3) au moyen d'une résine (15) fluide, le trajet d'écoulement de la résine (15) lors de l'imprégnation de l'armature en fibres (2) étant influencé par la matière auxiliaire (14), et, après l'imprégnation de l'armature en fibres (2) avec la résine (15), on durcit l'ébauche (1) pour donner l'élément de construction.
PCT/EP2014/001483 2013-07-18 2014-06-03 Procédé de fabrication d'un élément de construction en matériau composite à base de fibres WO2015007353A2 (fr)

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DE102013012005.5A DE102013012005B4 (de) 2013-07-18 2013-07-18 Verfahren zur Herstellung eines Bauteils aus einem Faserverbundwerkstoff
DE102013012005.5 2013-07-18

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WO2015007353A2 true WO2015007353A2 (fr) 2015-01-22
WO2015007353A3 WO2015007353A3 (fr) 2015-03-19

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