EP4255722A1 - Method of producing a fibre composite component in sheet form with at least one curve - Google Patents

Method of producing a fibre composite component in sheet form with at least one curve

Info

Publication number
EP4255722A1
EP4255722A1 EP22700361.3A EP22700361A EP4255722A1 EP 4255722 A1 EP4255722 A1 EP 4255722A1 EP 22700361 A EP22700361 A EP 22700361A EP 4255722 A1 EP4255722 A1 EP 4255722A1
Authority
EP
European Patent Office
Prior art keywords
fiber material
composite component
tool
roving
fiber
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.)
Pending
Application number
EP22700361.3A
Other languages
German (de)
French (fr)
Inventor
Michael Karl
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.)
Siemens Mobility GmbH
Original Assignee
Siemens Mobility GmbH
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 Siemens Mobility GmbH filed Critical Siemens Mobility GmbH
Publication of EP4255722A1 publication Critical patent/EP4255722A1/en
Pending legal-status Critical Current

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
    • B29C70/28—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
    • B29C70/04—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
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced 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
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • 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
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
    • 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
    • B29C70/541—Positioning reinforcements in a mould, e.g. using clamping means for the 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
    • B29C70/28—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
    • B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • 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

Definitions

  • the invention relates to a method for producing a plate-shaped fiber composite component, the outer shape of which has at least one curvature, in which the fiber material is inserted into a tool which has an inner curved contact surface for the fiber material that is adapted to the curvature of the fiber composite component and in is converted into a laminate with the tool under the action of pressure and/or temperature.
  • the following measures are taken in an RTM process in which the fiber material is placed in a tool with a lower fixed tool shell and a vacuum film, which together with the lower tool shell forms the cavity into which the fiber material is to be inserted : in the area of the corners and small radii of the fiber composite component, folds are placed in the film of the tool.
  • the film exerts local pressure on the fiber material in the areas of corners or small radii of the fixed tool shell and prevents the film from being overstretched as well.
  • the invention is based on the object of further developing the method for producing a fiber composite component of the type mentioned at the outset in such a way that qualitatively improved laminate structures result in the area of corners and small radii of the fiber composite component.
  • the initially described method for producing a plate-shaped fiber composite component is characterized in that a roving is inserted into the curvature of the fiber material after the fiber material has been inserted into the tool and before the fiber material is transformed into the laminate.
  • the roving is, in particular, endless filaments which, when the tool is laid, are laid into the corners and areas with small radii along the course of these corners and small radii after the dry fiber material or the fiber material present as prepreg has been laid. In this way, an endless fiber reinforcement of the fiber composite component is created in areas that would not be reinforced when using methods according to the prior art.
  • the roving structure can also function as a stiffening frame. Due to a preferably provided endless fiber structure, it has high strength and stiffness.
  • the roving is preferably made from the same material as the fiber material. This can in particular be glass fiber or carbon fiber material. However, different choices can also be made between the material for the endless filaments and the material for the fibers.
  • the fibrous material is preferably present in one or more layers of fibrous mats. These can either be in the form of prepreg, in which they have already been treated with a resin/hardener mixture, or as a dry fiber material, which in the course of being subjected to pressure and/or temperature temperature, for example when carrying out an RTM process, both resin and hardener can be added.
  • the roving is arranged and supported on the fiber material in such a way that it acts on the fiber material in the area of its curvature as a pressure piece acting in the direction of the inner curved contact surface of the tool.
  • the vacuum film tends to overstretch and void in corners.
  • the roving fills this cavity.
  • the vacuum foil presses on the roving.
  • the roving in turn presses the fiber material into the geometry (eg small radius) of the cavity. A pressure-free area that would result from overstretching the film is prevented.
  • folds can be placed in the vacuum film so that the vacuum film can be tightened into the corners of the tool shell.
  • FIG. 1 shows a schematic cross-sectional view of a fiber material placed in a tool shell before the fiber material is transformed into a laminate
  • FIG. 2 shows a schematic cross-sectional view of a fiber material placed in a tool tray after the fiber material has been transformed into a laminate.
  • FIG. 1 shows a dry fibrous material 1 which is placed in a fixed mold shell 2 in order to be formed into a laminate.
  • the fiber material 1 is used to produce a fiber composite component, the outer shape of which is adapted to that of the later present fiber composite component.
  • the tool shell 2 has an inner corner 3 so that the shape specified by the inner corner 3 is transferred to the outer shape of the adjoining area of the fiber material 1 in the course of a lamination process.
  • the fiber material 1 therefore has a curved area 4 which is directly adjacent to the inner corner 3 . Both the inner corner 3 and the curved area 4 extend a little way along the plate-shaped fiber composite component, perpendicular to the plane of the drawing in FIGS.
  • a roving 5 is inserted, which in the present exemplary embodiment is formed from endless filaments that form a bundle and is made from the same fiber material as the fiber material 1 .
  • these can be carbon or glass fibers.
  • the roving 5 is thus arranged on an outside of the curved area 4 of the dry fiber material in relation to the tool shell 2 .
  • FIG. 2 now shows the situation that arises after a lamination process has been carried out, for example an RTM process (Resin Transfer Molding process).
  • a cavity required to build up a negative pressure in the area of the fiber material 1 is formed by the mold shell 2 and a vacuum foil 6, which together form a pressure-tight cavity in which the fiber material 1 is arranged and, for example, by subjecting the cavity to a negative pressure with a resin / Hardener mixture is applied, as required, with additional application of pressure and / or heat.
  • RTM process Resin Transfer Molding process
  • the fiber material 1 transformed into a laminate forms a right-angled edge (the curved area 4 in FIG. 1), with the roving 5 being arranged on an inside of the right-angled edge of the fiber composite component - net and fused with the fiber material 1 zen.
  • the roving 5 also acts as a pressure piece on the fiber material 1 and presses it into the inner corner 3, because when there is a negative pressure in the cavity, the vacuum foil 6 presses on the roving 5 and the roving 5 presses the fiber material 1 into the tool.
  • the method described above for producing a plate-shaped fiber composite component is completed by removing the vacuum film 6 and then removing the finished fiber composite component from the mold shell 2 .
  • the method presented is particularly suitable for plate-shaped fiber composite components whose external shape has at least one curvature with a radius of less than 20 mm, in particular less than 10 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method of producing a fibre composite component in sheet form, the outer shape of which has at least one curve, in which fibre material (1) is introduced into a mould having an inner curved contact surface for the fibre material (1) which is adapted to the curvature of the fibre composite component, and is reshaped in the mould under high pressure and/or at high temperature to form a laminate, wherein a roving (5) is inserted into the curve of the fibre material (1) after insertion of the fibre material (1) into the mould and before reshaping of the fibre material (1).

Description

Beschreibung description
Verfahren zur Herstellung eines plattenförmigen Faserverbund- Bauteils mit wenigstens einer Krümmung Process for the production of a plate-shaped fiber composite component with at least one curvature
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines plattenförmigen Faserverbund-Bauteils , dessen äußere Form wenigstens eine Krümmung aufweist , bei dem Fasermaterial in ein Werkzeug eingelegt wird, das eine der Krümmung des Faserverbund-Bauteils angepasste innenliegende gekrümmte Anlagefläche für das Fasermaterial aufweist und in dem Werkzeug unter Beaufschlagung mit Druck und/oder Temperatur zu einem Laminat umgebildet wird . The invention relates to a method for producing a plate-shaped fiber composite component, the outer shape of which has at least one curvature, in which the fiber material is inserted into a tool which has an inner curved contact surface for the fiber material that is adapted to the curvature of the fiber composite component and in is converted into a laminate with the tool under the action of pressure and/or temperature.
Bei der Herstellung von Faserverbund-Bauteilen, beispielsweise in einem RTM-Verf ahren, stellt die Einhaltung von Quali- tätsanf orderungen an das Laminat besondere Anforderungen in Krümmungsbereichen, beispielsweise in Bereichen innenliegender Ecken oder Bereichen mit Radien, die einen Krümmungsradius von weniger als 20mm aufweisen . Beim Einlegen des eingesetzten Fasermaterials in ein Werkzeug lassen sich die Fasern nur schwer in innenliegende Ecken des Werkzeugs drapieren und Überspannen . Im Zuge der Durchführung des Herstellungsverfahrens entstehen an den betref fenden Stellen Harzansammlungen ohne Verstärkungs fasern oder Luftblasen . When manufacturing fiber composite components, for example in an RTM process, compliance with quality requirements for the laminate places special demands on curved areas, for example in areas with internal corners or areas with radii that have a radius of curvature of less than 20 mm . When the fiber material used is placed in a tool, it is difficult for the fibers to drape and span in the inside corners of the tool. During the course of the manufacturing process, accumulations of resin without reinforcing fibers or air bubbles form at the relevant points.
Zur Lösung des zugrundeliegenden Problems werden bei einem RTM-Verf ahren, bei dem das Fasermaterial in einem Werkzeug mit einer unteren festen Werkzeugschale und einer Vakuumfolie , die gemeinsam mit der unteren Werkzeugschale die Kavität bildet , in die das Fasermaterial einzulegen ist , folgende Maßnahmen getrof fen : im Bereich der Ecken und kleinen Radien des Faserverbund-Bauteils werden in die Folie des Werkzeugs Falten gelegt . Sobald die Kavität des Werkzeugs mit einem Unterdrück beaufschlagt wird, übt die Folie in den Bereichen von Ecken oder kleinen Radien der festen Werkzeugschale einen lokalen Druck auf das Fasermaterial aus und verhindert , dass die Folie ebenfalls überspannt wird . Im Übrigen wird ver- sucht , bei den herzustellenden Faserverbund-Bauteilen kleine Radien, soweit möglich, zu vermeiden . To solve the underlying problem, the following measures are taken in an RTM process in which the fiber material is placed in a tool with a lower fixed tool shell and a vacuum film, which together with the lower tool shell forms the cavity into which the fiber material is to be inserted : in the area of the corners and small radii of the fiber composite component, folds are placed in the film of the tool. As soon as a vacuum is applied to the cavity of the tool, the film exerts local pressure on the fiber material in the areas of corners or small radii of the fixed tool shell and prevents the film from being overstretched as well. Incidentally, seeks to avoid small radii as far as possible in the fiber composite components to be manufactured.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde , das Verfahren zur Herstellung eines Faserverbund-Bauteils der eingangs genannten Art derart weiterzuentwickeln, dass sich im Bereich von Ecken und kleinen Radien des Faserverbund- Bauteils qualitativ verbesserte Laminatstrukturen ergeben . Based on this, the invention is based on the object of further developing the method for producing a fiber composite component of the type mentioned at the outset in such a way that qualitatively improved laminate structures result in the area of corners and small radii of the fiber composite component.
Diese Aufgabe wird gelöst durch ein Verfahren nach Anspruch 1 . Danach ist das eingangs beschriebene Verfahren zur Herstellung eines plattenförmigen Faserverbund-Bauteils dadurch charakterisiert , dass nach Einlegen des Fasermaterials in das Werkzeug und vor Umbildung des Fasermaterials in das Laminat in die Krümmung des Fasermaterials ein Roving eingelegt wird . Bei dem Roving handelt es sich insbesondere um Endlos filamente , welche bei der Belegung des Werkzeugs nach Einlegen des trockenen oder als Prepreg vorliegenden Fasermaterials in die Ecken und Bereiche mit kleinen Radien entlang den Verlauf dieser Ecken und kleinen Radien eingelegt werden . Auf diese Weise entsteht eine Endlos faserverstärkung des Faserverbund- Bauteils in Bereichen, die bei Anwendung von Verfahren nach dem Stand der Technik unverstärkt wären . Die Roving-Struktur kann zusätzlich als Verstei fungsrahmen fungieren . Aufgrund einer bevorzugt vorgesehenen Endlos faserstruktur hat sie eine hohe Festigkeit und Stei figkeit . This object is achieved by a method according to claim 1. Accordingly, the initially described method for producing a plate-shaped fiber composite component is characterized in that a roving is inserted into the curvature of the fiber material after the fiber material has been inserted into the tool and before the fiber material is transformed into the laminate. The roving is, in particular, endless filaments which, when the tool is laid, are laid into the corners and areas with small radii along the course of these corners and small radii after the dry fiber material or the fiber material present as prepreg has been laid. In this way, an endless fiber reinforcement of the fiber composite component is created in areas that would not be reinforced when using methods according to the prior art. The roving structure can also function as a stiffening frame. Due to a preferably provided endless fiber structure, it has high strength and stiffness.
Bevorzugt ist der Roving aus demselben Material hergestellt , wie das Fasermaterial . Dabei kann es sich insbesondere um Glas faser- oder Karbonfasermaterial handeln . Zwischen dem Material für die Endlos filamente und dem Material für die Fasern können j edoch auch verschiedene Auswahlen getrof fen sein . Das Fasermaterial liegt bevorzugt in ein oder mehreren Schichten von Fasermatten vor . Diese können entweder als Prepreg vorliegen, bei dem sie bereits mit einem Harz-/Härter- Gemisch beaufschlagt sind, oder aber als trockenes Fasermaterial , das im Zuge der Beaufschlagung mit Druck und/oder Tem- peratur bei beispielsweise Durchführung eines RTM-Verf ährens , sowohl Harz als auch Härter zugesetzt werden . The roving is preferably made from the same material as the fiber material. This can in particular be glass fiber or carbon fiber material. However, different choices can also be made between the material for the endless filaments and the material for the fibers. The fibrous material is preferably present in one or more layers of fibrous mats. These can either be in the form of prepreg, in which they have already been treated with a resin/hardener mixture, or as a dry fiber material, which in the course of being subjected to pressure and/or temperature temperature, for example when carrying out an RTM process, both resin and hardener can be added.
Die Vorteile der Erfindung zeigen sich insbesondere dann, wenn ein Radius der Krümmung des Faserverbund-Bauteils kleiner als 20mm ist . The advantages of the invention are particularly evident when the radius of curvature of the fiber composite component is less than 20 mm.
Vorteilhafterweise wird der Roving nach Einlegen des Fasermaterials in die Werkzeugschale derart auf dem Fasermaterial angeordnet und abgestützt , dass es auf das Fasermaterial im Bereich von dessen Krümmung als in Richtung auf die innenliegende gekrümmte Anlagefläche des Werkzeugs wirkendes Druckstück wirkt . Die Vakuumfolie neigt dazu in Ecken zu Überspannen und Hohlräume zu bilden . Der Roving füllt diesen Hohlraum . Die Vakuumfolie drückt auf den Roving . Der Roving drückt wiederum das Fasermaterial in die Geometrie ( z . B . kleiner Radius ) der Kavität . Ein druckfreier Bereich, der durch ein Überspannen der Folie entstünde , wird verhindert . Zusätzlich können Falten in die Vakuumfolie gelegt werden, damit die Vakuumfolie in die Ecken der Werkzeugschale nachgezogen werden kann . Advantageously, after the fiber material has been placed in the tool shell, the roving is arranged and supported on the fiber material in such a way that it acts on the fiber material in the area of its curvature as a pressure piece acting in the direction of the inner curved contact surface of the tool. The vacuum film tends to overstretch and void in corners. The roving fills this cavity. The vacuum foil presses on the roving. The roving in turn presses the fiber material into the geometry (eg small radius) of the cavity. A pressure-free area that would result from overstretching the film is prevented. In addition, folds can be placed in the vacuum film so that the vacuum film can be tightened into the corners of the tool shell.
Ein Aus führungsbeispiel der Erfindung wird nachfolgend unter Bezugnahme auf Zeichnungen noch näher erläutert . Es zeigen : An exemplary embodiment of the invention is explained in more detail below with reference to drawings. Show it :
Figur 1 eine schematische Querschnittsansicht eines in einer Werkzeugschale eingelegten Fasermaterials vor Umbildung des Fasermaterials in ein Laminat und FIG. 1 shows a schematic cross-sectional view of a fiber material placed in a tool shell before the fiber material is transformed into a laminate and
Figur 2 eine schematische Querschnittsansicht eines in einer Werkzeugschale eingelegten Fasermaterials nach Umbildung des Fasermaterials in ein Laminat . FIG. 2 shows a schematic cross-sectional view of a fiber material placed in a tool tray after the fiber material has been transformed into a laminate.
Figur 1 zeigt ein trockenes Fasermaterial 1 , das zur Umbildung zu einem Laminat in eine feste Werkzeugschale 2 eingelegt ist . Das Fasermaterial 1 dient zur Herstellung eines Faserverbund-Bauteils , wobei dessen äußere Form an diej enige des später vorliegenden Faserverbund-Bauteils angepasst ist . Zu diesem Zweck weist die Werkzeugschale 2 eine innenliegende Ecke 3 auf , so dass die von der innenliegenden Ecke 3 vorgegebene Form im Zuge eines Laminier-Prozesses auf die äußere Form des angrenzenden Bereichs des Fasermaterials 1 übertragenen wird . Daher weist das Fasermaterial 1 einen gekrümmten Bereich 4 auf , der unmittelbar an die innenliegende Ecke 3 angrenzt . Sowohl die innenliegende Ecke 3 als auch der gekrümmte Bereich 4 erstrecken sich ein Stück weit entlang des plattenförmigen Faserverbund-Bauteils senkrecht zur Zeichnungsebene der Figuren 1 und 2 . FIG. 1 shows a dry fibrous material 1 which is placed in a fixed mold shell 2 in order to be formed into a laminate. The fiber material 1 is used to produce a fiber composite component, the outer shape of which is adapted to that of the later present fiber composite component. For this purpose, the tool shell 2 has an inner corner 3 so that the shape specified by the inner corner 3 is transferred to the outer shape of the adjoining area of the fiber material 1 in the course of a lamination process. The fiber material 1 therefore has a curved area 4 which is directly adjacent to the inner corner 3 . Both the inner corner 3 and the curved area 4 extend a little way along the plate-shaped fiber composite component, perpendicular to the plane of the drawing in FIGS.
Aus Figur 1 wird zudem deutlich, dass in dem gekrümmten Bereich 4 ein Roving 5 eingelegt ist , das im vorliegenden Ausführungsbeispiel aus Endlos filamenten gebildet ist , die ein Bündel bilden, sowie aus demselben Fasermaterial hergestellt ist , wie das Fasermaterial 1 . Beispielsweise kann es sich dabei um Kohlenstof f- oder Glaserfasern handeln . Bezogen auf die Werkzeugschale 2 ist somit der Roving 5 auf einer Außenseite des gekrümmten Bereichs 4 des trockenen Fasermaterials angeordnet . It is also clear from FIG. 1 that in the curved area 4 a roving 5 is inserted, which in the present exemplary embodiment is formed from endless filaments that form a bundle and is made from the same fiber material as the fiber material 1 . For example, these can be carbon or glass fibers. The roving 5 is thus arranged on an outside of the curved area 4 of the dry fiber material in relation to the tool shell 2 .
Figur 2 zeigt nunmehr die Situation, die sich nach Durchführung eines Laminier-Prozesses , beispielsweise eines RTM- Verfahrens (Resin Trans fer Molding-Verf ährens ) ergibt . Eine zum Aufbau eines Unterdrucks im Bereich des Fasermaterials 1 erforderliche Kavität wird gebildet durch die Werkzeugschale 2 und eine Vakuumfolie 6 , die gemeinsam eine druckdichte Kavität ausbilden, in der das Fasermaterial 1 angeordnet ist und beispielsweise durch Beaufschlagung der Kavität mit einem Unterdrück mit einem Harz-/Härtergemisch beaufschlagt wird, und zwar j e nach Bedarf unter zusätzlicher Beaufschlagung mit Druck und/oder Wärme . FIG. 2 now shows the situation that arises after a lamination process has been carried out, for example an RTM process (Resin Transfer Molding process). A cavity required to build up a negative pressure in the area of the fiber material 1 is formed by the mold shell 2 and a vacuum foil 6, which together form a pressure-tight cavity in which the fiber material 1 is arranged and, for example, by subjecting the cavity to a negative pressure with a resin / Hardener mixture is applied, as required, with additional application of pressure and / or heat.
Im Bereich der innenliegenden Ecke 3 der Werkzeugschale 2 ergibt sich dann, dass das zum Laminat umgebildete Fasermaterial 1 eine rechtwinklige Kante ( in Fig . 1 der gekrümmte Bereich 4 ) ausbildet , wobei der Roving 5 auf einer Innenseite der rechtwinkeligen Kante des Faserverbund-Bauteils angeord- net und mit dem Fasermaterial 1 verschmol zen ist . Dadurch ergibt sich eine Verstei fung des Faserverbund-Bauteils im Bereich der innenliegenden Kante 3 der Werkzeugschale 2 . In the area of the inner corner 3 of the tool shell 2, the result is that the fiber material 1 transformed into a laminate forms a right-angled edge (the curved area 4 in FIG. 1), with the roving 5 being arranged on an inside of the right-angled edge of the fiber composite component - net and fused with the fiber material 1 zen. This results in a reinforcement of the fiber composite component in the area of the inner edge 3 of the tool shell 2 .
Wie ein Vergleich der Figuren 1 und 2 zeigt , wirkt der Roving 5 zusätzlich als Druckstück auf das Fasermaterial 1 und drückt dieses in die innenliegende Ecke 3 hinein, denn bei Anliegen eines Unterdrucks in der Kavität drückt die Vakkum- folie 6 auf den Roving 5 und der Roving 5 drückt das Fasermaterial 1 in das Werkzeug . As a comparison of Figures 1 and 2 shows, the roving 5 also acts as a pressure piece on the fiber material 1 and presses it into the inner corner 3, because when there is a negative pressure in the cavity, the vacuum foil 6 presses on the roving 5 and the roving 5 presses the fiber material 1 into the tool.
Das vorstehend dargelegte Verfahren zur Herstellung eines plattenförmigen Faserverbund-Bauteils wird ausgehend von Figur 2 dadurch zu Ende geführt , dass die Vakuumfolie 6 abgenommen und danach das fertige Faserverbund-Bauteil aus der Werkzeugschale 2 entnommen wird . Starting from FIG. 2, the method described above for producing a plate-shaped fiber composite component is completed by removing the vacuum film 6 and then removing the finished fiber composite component from the mold shell 2 .
Es ist hervorzuheben, dass das vorgestellte Verfahren insbesondere für plattenförmige Faserverbund-Bauteile geeignet ist , deren äußere Form wenigstens eine Krümmung mit einem Radius von weniger als 20mm, insbesondere weniger als 10 mm aufweisen . Desto stärker die Krümmung ist , desto vorteilhafter ist das hier vorgestellte Verfahren . Sogar stärker als mit 5 mm Radius gekrümmte Bereiche eines Faserverbund- Bauteils können mit Hil fe dieses Verfahrens mit guter Qualität hergestellt werden, was eine Festigkeit der Struktur des plattenförmigen Faserverbund-Bauteils in seinem Krümmungsbereich angeht . It should be emphasized that the method presented is particularly suitable for plate-shaped fiber composite components whose external shape has at least one curvature with a radius of less than 20 mm, in particular less than 10 mm. The greater the curvature, the more advantageous the method presented here is. Areas of a fiber composite component that are even more curved than a 5 mm radius can be produced with the aid of this method with good quality as far as strength of the structure of the plate-shaped fiber composite component is concerned in its area of curvature.

Claims

6 Patentansprüche 6 patent claims
1. Verfahren zur Herstellung eines plattenförmigen Faserverbund-Bauteils, dessen äußere Form wenigstens eine Krümmung aufweist, bei dem Fasermaterial (1) in ein Werkzeug eingelegt wird, das eine der Krümmung des Faserverbund-Bauteils angepasste innenliegende gekrümmte Anlagefläche für das Fasermaterial (1) aufweist und in dem Werkzeug unter Beaufschlagung mit Druck und/oder Temperatur zu einem Laminat umgebildet wird, dadurch gekennzeichnet, dass nach Einlegen des Fasermaterials (1) in das Werkzeug und vor Umbildung des Fasermaterials (1) in das Laminat in die Krümmung des Fasermaterials (1) ein Roving (5) eingelegt wird. 1. A method for producing a plate-shaped fiber composite component, the outer shape of which has at least one curvature, in which the fiber material (1) is placed in a tool which has an inner curved contact surface for the fiber material (1) adapted to the curvature of the fiber composite component and is formed into a laminate in the tool under the action of pressure and/or temperature, characterized in that after the fiber material (1) has been placed in the tool and before the fiber material (1) is formed into the laminate in the curvature of the fiber material (1 ) a roving (5) is inserted.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Roving (5) von einem Bündel aus Endlosfilamenten gebildet wird . 2. The method according to claim 1, characterized in that the roving (5) is formed by a bundle of endless filaments.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Roving (5) aus demselben Material hergestellt ist wie das Fasermaterial (1) . 3. The method according to any one of claims 1 or 2, characterized in that the roving (5) is made of the same material as the fiber material (1).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass ein Radius der Krümmung des Faserverbund-Bauteils kleiner als 20 mm, bevorzugt kleiner als 10 mm ist. 4. The method according to any one of claims 1 to 3, characterized in that a radius of curvature of the fiber composite component is less than 20 mm, preferably less than 10 mm.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Roving (5) derart angeordnet und abgestützt wird, dass es auf das Fasermaterial (1) im Bereich (4) von dessen Krümmung als in Richtung auf die innenliegende gekrümmte Anlagefläche des Werkzeugs wirkendes Druckstück wirkt. 5. The method according to any one of claims 1 to 4, characterized in that the roving (5) is arranged and supported such that it is on the fiber material (1) in the region (4) of its curvature as in the direction of the inner curved contact surface the pressure piece that acts on the tool.
EP22700361.3A 2021-02-05 2022-01-04 Method of producing a fibre composite component in sheet form with at least one curve Pending EP4255722A1 (en)

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DE102021201106.3A DE102021201106A1 (en) 2021-02-05 2021-02-05 Process for producing a panel-shaped fiber composite component with at least one curvature
PCT/EP2022/050084 WO2022167160A1 (en) 2021-02-05 2022-01-04 Method of producing a fibre composite component in sheet form with at least one curve

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DE102008017381B4 (en) 2008-04-05 2011-12-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Method and aid for the production of components made of fiber composite material
US8771575B2 (en) * 2011-07-27 2014-07-08 Dieffenbacher GmbH Maschinen- und Anlagenbau Methods and systems for forming reinforced composite articles having variable thickness corners
DK2617555T3 (en) * 2012-01-20 2014-08-25 Siemens Ag Wind turbine rotor blade with trailing edge, extensive rovings
DE102015102440B4 (en) 2014-02-20 2017-01-12 East-4D Carbon Technology Gmbh Process for producing a fiber composite hollow body with a helical contour
BE1022462B1 (en) 2014-09-12 2016-04-07 Techspace Aero S.A. LOW AXIAL TURBOMACHINE COMPRESSOR COMPRESSOR CASING
EP3256332B1 (en) * 2015-02-11 2023-06-07 Mubea Carbo Tech GmbH Method to produce a fiber reinforced rim and a device for producing a fiber reinforced rim
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