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
  • B29C70/50—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
  • B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
• • 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
  • B29C70/525—Component parts, details or accessories; Auxiliary operations
  • B29C70/526—Pultrusion dies, e.g. dies with moving or rotating parts
• • 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
  • B29D99/0005—Producing noodles, i.e. composite gap fillers, characterised by their construction
• • 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

Definitions

• the invention relates to a method and an apparatus for producing a Faserzwickels for occupying voids in the production of T-shaped component segments of a fiber composite material.
• the invention also relates to a method and a system for producing a T-shaped component segment from a fiber composite material, wherein a previously prepared Faserzwickel is used to occupy voids.
• fiber composite components are suitable for a large number of applications.
• such fiber composite components are increasingly used for load-bearing structures in the vehicle and aircraft sector, for example, to be able to save fuel by reducing the total weight.
• a matrix material is injected into a fiber material and then the matrix material is cured so as to obtain an integral component form of matrix material and fiber material.
• the matrix material may, for example, be a resin as it is conventionally used for the production of fiber composite components.
• carbon fibers, aramid fibers or glass fibers come into consideration for a fiber material.
• stringers are reinforcing elements projecting from the component plane, thereby widening the fiber directional plane.
• Such stringer or stiffening elements are generally formed from two L-shaped component elements, which are joined to one another at each of their legs.
• the two other L-shaped angled legs form a common joining surface, so that such a stiffening element can then be attached to the surface to be stiffened with these legs formed as a joining surface.
• a system is known with which a flat fiber material or semi-finished fiber can be continuously formed and sheared, so as to produce, for example, frames or stringers for the stiffening of wing shells.
• the attached to a flat component form L-shaped stiffening elements form a T-shaped component segment.
• the L-shaped stiffening elements can not be angled without any curvature, a corresponding radius of curvature arises in the curvature region, which ultimately leads into a hollow point or a hollow space.
• This cavity is limited by the curvature of the first L-shaped stiffening element, the curvature of the second L-shaped stiffening element and the flat, to be stiffened component element.
• This resulting hollow point whose cross section with the wall thickness of the component and the radius of curvature of the Stiffening elements varies, must be filled to ensure the necessary stability of the overall construction.
• gussets are used in practice to close the voids in the composite preform, so that there can not form any resin accumulations, which would constitute a weak point in the fiber composite component.
• a gusset which can be introduced into the resulting cavity in the arrangement of stringers and frames on large-area component forms and moreover has an elastomeric material, so that the gusset conforms to the shape of the gusset Cavity or the cross-section of the cavity due to its elastomeric material can adjust.
• the disadvantage here is that with the elastomeric material, a further material property is introduced into the overall system. In addition, not all cross-sectional variations can be compensated with an elastomeric material.
• EP 2 006 074 A1 a method and a device for the production of profile-shaped fiber composite components are known, in which at least partially an areal fiber material is angled. In this case, a fiber gusset with a fixed outer cross section is produced by means of a gusset matrix made of a fiber material.
• the object is achieved by the method according to claim 1 and the device according to claim 6 according to the invention.
• the object is also achieved with the manufacturing method for producing a fiber composite component according to claim 12 and a related system according to claim 13.
• a method for producing a Faserzwickels for filling cavities in the production of fiber composite components made of a fiber composite material, in particular T-shaped component segments as fiber composite components claimed.
• a plurality of unidirectional fiber strands are provided which are provided with a thermally activatable binder material or are provided during the provision.
• Such unidirectional fiber strands can be, for example, rovings, each consisting of a multiplicity of individual fibers, so-called filaments.
• the unidirectional fiber strands are passed through a Zwekkelmatrize, the inner cross section of the gusset forming the negative of the outer shape of the fiber gusset to be produced.
• the fiber strands are pressed together by the gusset die and brought into a corresponding outer shape, which corresponds to the inner cross section of the gusset die.
• the fiber strands are tempered, so that the thermally activatable binder material is thermally activated, so as to fix the outer shape of the gusset just made when the thermally activated binder material cools again.
• the tempering of the fiber strands by means of a heating element can be carried out in the conveying direction before the gusset, in the gusset itself or after the gusset, which has proved to be advantageous if the heating element is integrated into the gusset and the fiber strands thus be tempered when passing through the gusset through the gusset by means of the heating element.
• the inventive method allows use directly in the manufacture of the fiber composite component, since the Faserzwickel can be produced continuously and thus in the manufacture of the fiber composite component, in particular in the forming and Preform suitsen produced on demand and integrated into the component.
• a fiber gusset is understood to mean in particular an elongated component which is provided for filling voids within a fiber composite component and adapted to the corresponding cross-sectional shape of the voids.
• a fiber gusset in the context of the present invention is, in particular, an elongate component which has an at least triangular cross-sectional shape.
• this is understood to mean a component which is used to occupy voids in the production of T-shaped component segments in order to suitably occupy, in particular, the hollow location with the generally triangular cross-section which arises in the crossing region of the T-shaped component segment and thus in the production of such To prevent T-shaped component segment that form there resin accumulations and thus it comes to weak points in the fiber composite component.
• a thermally activatable binder material is a material which, for example, is applied in powder form to the unidirectional fiber strands and is thermally activated by tempering, whereby it releases a binding property with which the fiber material can be fixed in its shape. This happens, for example, by melting a plastic, which solidifies on cooling and thereby fixes the fiber gusset in its shape.
• the unidirectional fiber strands are provided by applying a binder material to the fiber strands prior to passage through the gusset die.
• the amount of binder material applied to the fiber strands is dimensioned so that the fiber gusset after the thermal activation of the binder material and after cooling of the thermally activated binder material for fixing the Faserzwickel an elastomeric property, so small bumps or deviations to be able to compensate for an ideal shape in the hollow.
• the fiber gusset was fixed in shape by the thermally activatable binder material, but is still deformable to some degree.
• the outer cross section of the fiber gusset is varied, whereby a varying outer cross section or a varying outer shape can be produced over the entire length of the fiber gusset.
• This is particularly advantageous in particular when the fiber composite component to be produced, in particular the T-shaped component segment, also has voids which vary in cross-section due to different component thicknesses, but which have to be completely filled with fiber material.
• one or a part of the fiber strands is cut through by the gusset before passing through the gusset die by means of a cutting device and the delivery of the severed fiber strands is stopped in order to increase the number of fiber strands passed through the gusset die reduce when the outer cross section of the fiber gore is reduced by varying the inner cross section of the gusset die.
• a cutting device is thus provided which cuts through part or all of the fiber strands which are passed through the gusset die in front of the gusset die, so that the number of fiber strands passed through the gusset die is reduced. This allows the outer cross cut or the outer shape of the fiber gore, without increasing the fiber volume content by a higher compaction.
• the feeding of one or more severed fiber strands is restarted and the started fiber strands are again passed through the gusset die in order to increase the number of fiber strands passed through the gusset die when the outer cross section of the fiber strand Fiber gusset is increased by varying the inner cross section of the gusset die.
• the object is also achieved with a device for producing a fiber gusset according to claim 6.
• the device has a provision device, which is set up to provide unidirectional fiber strands.
• the device has a gusset die whose inner cross-section forms the negative of the outer shape of the fiber gusset to be produced and cooperates with the provision device in such a way that the unidirectional fiber strands provided can be passed through the gusset die.
• the gusset is further configured to compress the strands of fibers passing therethrough to form the gusset accordingly.
• the device has a heating element which is set up for tempering the fiber strands for the thermal activation of a binder material of the fiber strands so as to fix the outer shape of the fiber gusset.
• the gusset die is designed to vary the internal cross section during the production of the fiber gusset.
• the gusset has at least three frame members, which together form the inner cross section of the gusset as a negative of the outer shape of the fiber gusset to be produced, wherein the frame members are each mounted with one end on an adjacent frame member in the cross-sectional plane slidably to the respective adjacent frame member to the inside - cross section of the gusset to vary, ie to zoom in or out.
• a method for producing a T-shaped Bauteilseg- element made of a fiber composite material wherein in the resulting by the abutment of two L-shaped components in the curvature region cavity a Faserzwickel is used.
• the fiber gusset is continuously produced according to the preceding embodiments and inserted into the cavity.
• Figure 1 is a schematic representation of a T-shaped component segment
• Figure 2 is a schematic representation of a gusset die
• Figure 3 is a schematic representation of a system for producing a fiber composite component.
• FIG. 1 shows a T-shaped component segment 10 which, for example, can be an amplification arrangement for reinforcing planar components.
• the T-shaped component segment 10 in this case has a flat base component 1 1, to which two L-shaped components 12 and 13 are added.
• the two L-shaped components 12 and 13 are in each case attached to one of its legs 14a and 15a, so that the L-shaped projecting legs 14b of the first L-shaped component and 15b of the second L-shaped component form a continuous joining surface over the then the two L-shaped components 12 and 13 are added to the planar base member 1 1.
• Der L-förmige Baumaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinemaschinence 12 und 13 Sind in Fig. 1 cilantro.
• the curvature region 15c of the second L-shaped component 13 and the flat base component 11 arises due to the curvature of the L-shaped components 12 and 13, a hollow point 16 whose cross section, in particular its size, depends on the component thickness of the L-shaped components 12 and 13. The thicker the component thickness of the L-shaped components 12 and 13, the larger the resulting hollow point 16.
• this hollow point 16 In the manufacture of fiber composite components, this hollow point 16 must be filled with a material in order to avoid accumulation of resin in the hollow point 16, which can then lead to weak points in the fiber composite component 10.
• FIG. 2 schematically shows a gusset die 20 with which, according to the invention, a fiber gusset can be produced by passing fiber strands through the gusset die 20.
• the gusset die 20 is in one Top view shown, ie the passing of the fiber strands out of the viewing plane out.
• the gusset die 20 has an inner cross section 21, which forms the negative of the outer shape of the fiber gusset to be produced.
• the inner cross section 21 is triangular, whereby a triangular Faserzwickel can be produced.
• this inner cross section 21, which is initially designed as a passage through which the fiber strands are guided, is formed by three frame members 22, 23 and 24, each adjacent to one of its end faces on an adjacent frame member and are mounted on these.
• the gusset die is formed such that the first frame element 22 bears against the adjacent second frame element 23 with one of its end faces 22a, while the end face 23a of the second frame element 23 abuts against the third frame element 24 whose one end face 24a in turn adjoins the first frame element 24a Frame element 22 abuts.
• the frame members 22, 23 and 24 are slidably mounted with their respective end faces 22a, 23a and 24a on the respective adjacent frame member, which is represented by the arrows of the gusset die on the left side.
• the frame elements are displaceably mounted in the plane of the inner cross section 21, so that the inner cross section 21 can be varied by a displacement of the frame elements 22, 23 and 24.
• a gusset die 20 is shown on the right side, in which the frame members 22, 23 and 24 have been displaced outwards relative to their adjacent frame member, whereby the inner cross section 21 has been enlarged in terms of its area.
• the inner cross section 21 is reduced in area.
• FIG. 3 shows a plant 30 which has a provision device 31, with which unidirectional fiber strands 32 are provided.
• the unidirectional fiber strands are then fed to the gusset die 33 which is formed as shown, for example, in FIG.
• a dimensionally stable fiber gusset 34 was produced, which is then inserted continuously into the hollow location 35 of two L-shaped component segments 36.
• a pressure roller 37 By means of a pressure roller 37, the fiber gusset 34 can be pressed into the hollow location 35 of the L-shaped component segments 36.
• a cutting device 38 is provided in the conveying direction in front of the gusset die 33, which cuts through fiber strands 32 as the inner cross section of the gusset die 33 is reduced and the conveyance in the direction of the gusset die 33 is then stopped.
• the number of fiber strands that are fed to the gusset die 33 is reduced, whereby the total fiber volume in the fiber gusset to be produced is adapted to the reduced inner cross section.
• the gusset 33 has a heating element 39, with which the fiber strands are tempered while passing through the gusset die 33, whereby a thermally activatable binder material is activated, so as to fix the manufactured fiber gusset 34 in its shape.

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

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Citations (4)

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• 2016
  • 2016-01-11 DE DE102016100335.2A patent/DE102016100335B3/de active Active
  • 2016-12-20 WO PCT/EP2016/081935 patent/WO2017121584A1/de not_active Ceased
• 2017
  • 2017-01-09 FR FR1750182A patent/FR3046565A1/fr not_active Ceased

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