WO2020030349A1 - Élément de structure pour véhicule automobile - Google Patents

Élément de structure pour véhicule automobile Download PDF

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Publication number
WO2020030349A1
WO2020030349A1 PCT/EP2019/067673 EP2019067673W WO2020030349A1 WO 2020030349 A1 WO2020030349 A1 WO 2020030349A1 EP 2019067673 W EP2019067673 W EP 2019067673W WO 2020030349 A1 WO2020030349 A1 WO 2020030349A1
Authority
WO
WIPO (PCT)
Prior art keywords
structural component
fibers
component according
reinforcing fibers
profile
Prior art date
Application number
PCT/EP2019/067673
Other languages
German (de)
English (en)
Inventor
Thomas Hogger
Sebastian Krull
Matthias Nagel
Octavian Knoll
Daniel Heim
Oleg Konrad
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
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 Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Publication of WO2020030349A1 publication Critical patent/WO2020030349A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/20—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
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467—Joining articles or parts of a single article
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • 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
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0003—Producing profiled members, e.g. beams
    • B29D99/0007—Producing profiled members, e.g. beams having a variable cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
    • B62D29/043—Superstructures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/06—Fixed roofs

Definitions

  • the invention relates to a structural component for a motor vehicle with at least one elongated profile made of fiber-reinforced plastic, which has a plastic matrix and reinforcing fibers embedded therein, and an injection-molded rib structure molded onto the profile.
  • Fiber-reinforced plastics have a high potential for lightweight construction and can absorb high tensile forces due to the incorporated fibers.
  • the weight-specific advantages of fiber-reinforced plastics can be best exploited if the fibers in the matrix material run along the load paths, which requires the component to be designed to withstand the load.
  • a structural component in a so-called skeleton construction is known from the generic DE 10 2013 219 820 A1, which is used as a body component, e.g. Cowl of a vehicle, is used.
  • Such a structural component 1 according to the prior art is shown in FIG. 1 and has two profiles 2 in the form of fiber-reinforced plastic rods, between which struts 4 are arranged, which serve to shape the component and, in particular, are produced by molding a plastic material onto the profiles 2 become.
  • the profile has a plurality of elongated stabilizing fibers embedded in the plastic matrix, which are characterized by a higher elongation at break than the reinforcing fibers.
  • These stabilizing fibers in addition to the actual reinforcing fibers and the plastic matrix form a third component of the elongated profile, in the event of an overload of the profile, for example in the event of an accident, because of their higher ductility, they prevent breakage or splintering at least to such an extent that there are no sharp breaking edges which could then protrude into the interior of the vehicle.
  • fibers are to be understood as meaning different elongated, fibrous materials, for example also wires and / or braids.
  • the profile is, in particular, a fiber-reinforced plastic rod which is arranged along a component load path, as a result of which a construction which is as load-bearing as possible is achieved.
  • the injection molding rib structure is preferably designed in the manner of a truss and serves to shape and stiffen the component.
  • the skeleton construction implemented in this way primarily meets lightweight construction requirements and enables a load-bearing design and a load path-compatible design of the structural component. In this way, in particular light and at the same time stable structural stiffening elements for motor vehicle body construction can be inexpensively mass-produced, which are characterized by a reliable guarantee of structural integrity.
  • the stabilizing fibers are made of a different material than the reinforcing fibers.
  • a plurality of elongated stabilizing fibers is preferably provided, which reliably ensures the structural integrity in the event of an overload.
  • the reinforcing fibers are carbon fibers, whereby particularly light components are achieved.
  • the use of glass fibers is also conceivable.
  • the elongated stabilizing fibers are preferably glass fibers. These have a higher elongation at break or ductility than carbon fibers. If glass fibers are already used as reinforcing fibers, another glass with higher ductility is used in particular for the stabilizing fibers.
  • the combination of two different materials as reinforcing fibers and stabilizing fibers can be compared to the sole use of fibers with high Ductility offer advantages in terms of stability, rigidity, weight and / or manufacturing costs of the structural component.
  • the elongated stabilizing fibers can be metal wires which also have a high elongation at break.
  • the profile is produced in a pultrusion process in which both the reinforcing fibers and the elongated stabilizing fibers are embedded in the plastic matrix. In this way, rod-like profiles with different cross-sections can be manufactured in a simple and inexpensive manner.
  • the reinforcing fibers preferably run essentially parallel to one another, in particular they are oriented unidirectionally. Reinforcing fibers of this type exhibit an anisotropic material behavior, as a result of which the structural component has high rigidity, particularly in the longitudinal direction.
  • the reinforcing fibers form a bundle which is surrounded on its outer surface by a layer of elongated stabilizing fibers.
  • the elongated stabilizing fibers form a bundle, which is surrounded on its outer surface by a layer of reinforcing fibers.
  • the inner bundle made of the first material component has the geometric shape of a cylinder or prism, in particular with a round, elliptical or angular cross section, and is completely surrounded on the outside by a layer of the second material component. This arrangement is easy to implement in terms of production technology and is characterized by a reliable guarantee of structural integrity.
  • Two or more elongate profiles made of fiber-reinforced plastic are preferably provided, which are connected by the injection molding rib structure.
  • the profiles run in particular along the component load paths, which results in a light and stable component with a design that is suitable for the load path and can withstand particularly high loads. If the fiber-reinforced plastic profiles run along an outer surface of the structural component, this also simplifies the manufacture of the structural component, since the fiber-reinforced plastic profiles can simply be inserted into a tool.
  • the injection molding rib structure can consist of a short fiber reinforced thermoplastic. In addition, short fiber reinforced thermoplastics are particularly well suited for injection molding applications.
  • a flat support part made of organic sheet which is connected to the profile and / or the injection molding with a rib structure and in particular extends at least in one plane over the entire surface of the structural component.
  • the additional support part made of organic sheet which is a thin-walled, flat fiber-thermoplastic semi-finished product, is combined with the profile and the injection-molded rib structure in such a way that the structural component is increased in rigidity.
  • organic sheet also has a high elongation at break, which also has a positive effect on the structural integrity of the component in the event of an overload.
  • the carrier part is preferably connected to the injection molding rib structure and / or the profile by means of material locking and / or positive locking. A particularly stable connection and at the same time simple and inexpensive production can be achieved if the carrier part is connected directly to the other components when the rib structure is injected.
  • At least one connecting element made of metal is provided, which is connected to the injection molding rib structure by means of material locking, friction locking and / or positive locking.
  • This enables the structural component to be connected to an adjacent vehicle structure using warm connection techniques for metallic materials such as Welding.
  • the connecting element can have recesses, for example, and can be partially overmolded as an insert when the injection-molded rib structure is produced.
  • Figure 1 is a schematic representation of a structural component according to the prior art in side view
  • Figure 2 is a schematic representation of a structural component according to the invention in side view
  • FIG. 3 shows schematic cross-sectional views of two profiles used in the structural component according to the invention.
  • Figure 4 is a schematic representation of a structural component according to a development of the invention in side view.
  • FIG. 2 shows a structural component 10 according to the invention for a motor vehicle, which is, in particular, a body component such as a roof bow.
  • the structural component 10 has two elongated profiles 12 made of fiber-reinforced plastic, which are designed here as rods.
  • the fiber reinforcement of the profiles 12 is formed by a multiplicity of reinforcing fibers 14 running parallel to one another (see FIGS. 3a and 3b), which are preferably unidirectionally oriented continuous fibers which are embedded in a plastic matrix 16, in particular made of thermoplastic, as shown in FIG 3 can be removed.
  • the profiles 12 have numerous elongated stabilizing fibers 18 embedded in the plastic matrix 16, which are characterized by a higher elongation at break or ductility than the reinforcing fibers 14. While carbon fibers are preferably used as reinforcing fibers 14, the elongated stabilizing fibers 18 are glass fibers which have a higher ductility than carbon fibers or metal wires.
  • the profiles 12 are produced in a pultrusion process in which both the reinforcing fibers 14 and the elongated stabilizing fibers 18 are embedded in the plastic matrix 16.
  • the reinforcing fibers 14 form a bundle 20 which is surrounded on its outer surface 22 by a layer 24 of stabilizing fibers 18.
  • the reinforcing fibers 14 do not extend here into the layer of the stabilizing fibers 18. This variant is shown in FIG. 3a.
  • the elongated stabilizing fibers 18 form a bundle 26, which is surrounded on its outer surface 28 by a layer 30 of reinforcing fibers 14 (see FIG. 3b).
  • a layer 30 of reinforcing fibers 14 see FIG. 3b.
  • reinforcing fibers 14 and stabilizing fibers 18 are arranged alternately, regularly or arbitrarily, in a common bundle.
  • the structural component 10 also has an injection-molded rib structure 32 molded onto the profiles 12, which is constructed in the manner of a framework and which connects the two profiles 12 to one another (see FIG. 2) and consists of a short-fiber-reinforced thermoplastic which, for example, is also produced via in-situ polymerization. ,
  • a connecting element 34 made of metal here a metal flange, is provided, which is connected to the injection molding rib structure 32 by means of material locking, friction locking and / or positive locking, here in particular by means of positive locking.
  • the connecting element 34 made of metal is not a mandatory component of the structural component 10 according to the invention.
  • FIG. 4 shows a structural component 10 according to a development of the invention, which, in addition to the components described so far, has a flat support part 36 made of organic sheet metal, which is connected to the injection molding rib structure 32 in a cohesive or positive manner.
  • the carrier part 36 extends in a plane which corresponds to the plane of the drawing and runs parallel to the plane defined by the two profiles 12, over the entire surface of the structural component 10, that is to say in particular up to its edge.
  • the injection molding rib structure 32 can be provided on one side (namely the front side visible in FIG. 4) of the flat carrier part 36 or can be present on both sides of the flat carrier part 36, in particular symmetrically.
  • a suitable mold is first provided, and the elongated profiles 12, which are prefabricated in the pultrusion process, are heated and, if necessary, hot-formed. If a flat carrier part 36 made of organic sheet is used, this is also heated and inserted together with the formed profiles 12 into the mold. Finally, the profiles 12 (and possibly the carrier part 36) is at least partially encapsulated with plastic, the injection molding rib structure 32 being formed at the same time.
  • a connecting element 34 made of metal is provided, this is preferably also inserted into the tool mold together with the shaped profiles 12 and the carrier part 36, and is partially overmolded during injection molding of the injection molding rib structure 32 in order to produce the desired connection.
  • the structural component 10 according to the invention is characterized by a low weight and high stability due to the skeleton construction.
  • the stabilizing fibers 18 ensure a secure guarantee of structural integrity.
  • the optional use of a support part 36 made of organic sheet can additionally increase the rigidity and further improve the elongation at break.

Abstract

La présente invention concerne un élément de structure (10) pour véhicule automobile qui présente au moins un profil longitudinal (12) en matière plastique renforcée de fibres qui présente une matrice plastique ainsi que des fibres de renforcement incorporées à l'intérieur, et une structure nervurée moulée par injection (32) appliquée sur le profil (12). Le profil (12) présente plusieurs fibres de stabilisation longitudinales incorporées dans la matrice plastique et qui se caractérisent par un allongement à la rupture supérieur à celui des fibres de renforcement.
PCT/EP2019/067673 2018-08-09 2019-07-02 Élément de structure pour véhicule automobile WO2020030349A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018213371.9 2018-08-09
DE102018213371.9A DE102018213371A1 (de) 2018-08-09 2018-08-09 Strukturbauteil für ein Kraftfahrzeug

Publications (1)

Publication Number Publication Date
WO2020030349A1 true WO2020030349A1 (fr) 2020-02-13

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ID=67180767

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/067673 WO2020030349A1 (fr) 2018-08-09 2019-07-02 Élément de structure pour véhicule automobile

Country Status (2)

Country Link
DE (1) DE102018213371A1 (fr)
WO (1) WO2020030349A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056472A1 (de) * 2009-12-01 2011-06-09 Daimler Ag Verbundbauteil und Verfahren zu dessen Herstellung
DE102011105858A1 (de) * 2011-06-01 2012-12-06 Daimler Ag Faserverbundkunststoff-Pultrusionsprofil und Herstellungsverfahren
DE102013006131A1 (de) * 2013-04-10 2014-10-16 Webasto SE Dachrahmenbauteil eines Dachöffnungssystems eines Fahrzeugs
DE102013219820A1 (de) 2013-09-30 2015-04-02 Bayerische Motoren Werke Aktiengesellschaft Faserverbundwerkstoffbauteil, Verfahren zur Herstellung eines Faserverbundwerkstoffbauteils sowie Verwendung von Faserbündeln und Verstrebungsmitteln zur Herstellung eines Faserverbundwerkstoffbauteils

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2878434A1 (fr) * 2013-12-02 2015-06-03 B & S Ohg Système composite et son procédé de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056472A1 (de) * 2009-12-01 2011-06-09 Daimler Ag Verbundbauteil und Verfahren zu dessen Herstellung
DE102011105858A1 (de) * 2011-06-01 2012-12-06 Daimler Ag Faserverbundkunststoff-Pultrusionsprofil und Herstellungsverfahren
DE102013006131A1 (de) * 2013-04-10 2014-10-16 Webasto SE Dachrahmenbauteil eines Dachöffnungssystems eines Fahrzeugs
DE102013219820A1 (de) 2013-09-30 2015-04-02 Bayerische Motoren Werke Aktiengesellschaft Faserverbundwerkstoffbauteil, Verfahren zur Herstellung eines Faserverbundwerkstoffbauteils sowie Verwendung von Faserbündeln und Verstrebungsmitteln zur Herstellung eines Faserverbundwerkstoffbauteils

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DE102018213371A1 (de) 2020-02-13

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