WO2020200675A1 - Procédé pour la préparation continue de structures cellulaires pliées, ainsi qu'une structure cellulaire pliée - Google Patents

Procédé pour la préparation continue de structures cellulaires pliées, ainsi qu'une structure cellulaire pliée Download PDF

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Publication number
WO2020200675A1
WO2020200675A1 PCT/EP2020/056450 EP2020056450W WO2020200675A1 WO 2020200675 A1 WO2020200675 A1 WO 2020200675A1 EP 2020056450 W EP2020056450 W EP 2020056450W WO 2020200675 A1 WO2020200675 A1 WO 2020200675A1
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WO
WIPO (PCT)
Prior art keywords
reinforcement
flat
material web
flat material
web
Prior art date
Application number
PCT/EP2020/056450
Other languages
German (de)
English (en)
Inventor
Michael KUCHER
Martin Dannemann
Frank Adam
Niels Modler
Marco Zichner
Original Assignee
Technische Universität Dresden
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Filing date
Publication date
Application filed by Technische Universität Dresden filed Critical Technische Universität Dresden
Publication of WO2020200675A1 publication Critical patent/WO2020200675A1/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
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B29C70/021—Combinations of fibrous reinforcement and non-fibrous 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
    • 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
    • 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
    • B29C53/06—Forming folding lines by pressing or scoring
    • B29C53/063—Forming folding lines by pressing or scoring combined with folding
    • 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
    • B29D99/0089—Producing honeycomb structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D3/00—Making articles of cellular structure, e.g. insulating board
    • B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
    • B31D3/0223—Making honeycomb cores, e.g. by piling a plurality of web sections or sheets
    • B31D3/0246—Plane webs having essentially longitudinal adhesive strips being folded transversely into stacks or being cut transversely into sections which are piled, e.g. zigzag-folding the webs preceding the cutting
    • 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction

Definitions

  • the invention relates to a method for the continuous production of folded cell structures and a folded cell structure with application-specific, local reinforcement.
  • the invention also relates to a device for producing folded cell structures with application-specific, local reinforcement.
  • Folded honeycomb structures are used as structured core materials for sandwich construction.
  • Sandwich construction elements are i.a. Used in the aerospace industry because of the high requirements for weight savings and the requirements for mechanical and / or acoustic properties. Continuous manufacturing processes for folded honeycomb structures are well known.
  • a folded honeycomb structure and a method for the automated and continuous production of the folded honeycomb structure without incisions are known.
  • a flat material web of a thermoplastic polymer, a fiber-reinforced composite material or a plastically deformable paper or sheet metal is plastically deformed in strip-shaped areas in a polygonal, sinusoidal or curved shape. These areas are unfolded by 90 ° and form the vertical cell walls of the honeycomb.
  • the honeycomb structure formed in this way has closed cover layers, so that additional cover layers are not necessary, depending on the material web used.
  • US Pat. No. 8,795,806 B2 discloses a folded honeycomb structure, a continuous process and an apparatus for producing the same.
  • a flat material web is plastically deformed in order to form polygonal, sinusoidal or arched 3D structures and connecting areas.
  • the 3D structures are preferably formed using a vacuum thermoforming process.
  • the 3D structures are unfolded in the feed direction, see above that the 3D structures form the vertical cell walls of the honeycomb structure and the connection areas perpendicular to the cell walls are used to connect with cover layers.
  • WO 95/10412 A1 describes a non-metallic honeycomb structure made of composite materials with improved thermal conductivity through the incorporation of pitch-based carbon fibers.
  • Resin-impregnated glass fibers, carbon fibers based on polyacrylonitrile, polyaramid fibers or ceramic fibers come into consideration as composite materials, the resins typically being thermoset or thermoplastic polymers.
  • the cell walls of the honeycomb structure consist of a fabric of non-metallic fibers and hardened resin.
  • the pitch-based carbon fibers are woven into the fabric.
  • honeycomb structures are only produced from foldable materials that have a certain plastic deformability.
  • Application-specific, locally reinforced honeycomb structures and processes for their continuous production are not yet known.
  • the object of the invention is therefore to propose a method for the continuous production of folded cell structures with application-specific, local reinforcement.
  • Another object of the invention is to specify a folded cell structure with application-specific, local reinforcement and to propose a device for producing such folded cell structures.
  • the method according to the invention for the continuous production of folded cell structures with application-specific, local reinforcement comprises at least the steps of a) providing a flat material web of a foldable material, b) pre-structuring the flat material web, c) folding the pre-structured material web.
  • a reinforcement material is provided in step d), in step e) the reinforcement material and / or the flat material web is prepared for the subsequent material application and in step f) the reinforcement material is applied materially in at least one area on at least one side of the flat material web.
  • steps d), e) and f) are carried out after step a).
  • the method according to the invention advantageously enables the local reinforcement of the flat material web of a foldable material, so that folded cell structures with application-specific, local reinforcement are produced.
  • a cell structure in the context of the invention is understood to mean a structure which is formed from individual cells.
  • a single cell has at least one lateral cell wall, via which neighboring cells are connected to one another.
  • the individual cells can have different cross-sectional shapes.
  • Known cross-sectional shapes are, for example, hexagonal cells.
  • the cells can also have other known polygonal cross-sectional shapes, such as, for example, triangular or square cross-sectional shapes.
  • the cell structure is a honeycomb structure formed from hexagonal cells.
  • a flat material web of a foldable material is provided.
  • a flat material web of a foldable material in the sense of the invention means any material which is plastically deformable by folding or which is plastically deformable with thermal support in order to form a folded cell structure.
  • a large number of materials are known from the prior art as flat material webs for the production of folded cell structures, for example thermoplastic polymers, fiber composite material, paper, fiber-reinforced paper or thin metallic sheets.
  • step b) the flat material web is pre-structured.
  • Pre-structuring in the context of the invention means any process steps which enable the pre-structured flat material web to be folded into a cell structure in step c).
  • Possibilities for pre-structuring and folding a flat material web are known to the person skilled in the art from the prior art.
  • a reinforcement material in the context of the invention means any material suitable for reinforcing the flat material web.
  • the reinforcement material can be a fiber composite material, a fiber material, a metal sheet, paper, fiber-reinforced paper or a thermoplastic polymer.
  • the reinforcement material is a non-foldable material which cannot be deformed by folding.
  • a fiber material within the meaning of the invention means a fiber material that can be in technically known forms of use, for example as a unidirectional, bi- or multidirectional fiber structure, such as woven, braided, laid, knitted and knitted fabrics, as a fleece or as a fiber strand, the fiber material being Includes materials known to those skilled in the art.
  • Different materials of the flat material web can be combined with different materials of the reinforcement material. The person skilled in the art knows which materials can be suitably combined with one another.
  • a flat material web of a fiber composite material can be combined with a polymer or another fiber composite material as a reinforcement material.
  • thermoplastic polymer as a flat material web is preferably combined with a fiber composite material as a reinforcement material, the matrix material of the fiber composite material being preferably compatible with the thermoplastic polymer of the flat material, particularly preferably the matrix material of the fiber composite material being identical to the thermoplastic material of the flat material web.
  • Fiber composite materials are known to the person skilled in the art and usually contain a fiber material as a reinforcement component and a matrix material as a fiber strand.
  • the fiber composite material can be present as a short or long fiber reinforced fiber composite material.
  • the materials of the fiber materials, which are contained as reinforcement components in fiber composite materials include glass fibers, carbon fibers, aramid fibers, basalt fibers, plastic fibers or natural fibers or combinations of these.
  • the matrix material in the fiber composite material can be a thermosetting or thermoplastic polymer, but also an elastomer, a metal or a ceramic.
  • Fiber composite materials with thermoplastic matrix material can be completely impregnated or not completely impregnated.
  • Fully impregnated, thermoplastic fiber composite materials are fiber composite materials in which the thermoplastic matrix material completely surrounds the fiber material, for example completely impregnated and consolidated thermoplastic tapes.
  • Not completely impregnated or also pre-impregnated thermoplastic fiber composite materials are fiber composite materials in which the fiber material and the thermoplastic matrix material are present separately.
  • thermoplastic fiber composite materials examples include powder-impregnated or layer-impregnated fiber composite materials in which the thermoplastic matrix material is present as a powder finely distributed between the fiber material or as a film that covers the fiber material from above and below.
  • examples of such incompletely impregnated thermoplastic fiber composite materials are pre-impregnated thermoplastic tapes.
  • thermoplastic fiber composite materials are known in which the matrix material as thermoplastic fiber material in a homogeneous mixture with the Fiber material, for example as a hybrid roving or a hybrid fiber structure, such as a hybrid fabric, a hybrid fleece or a hybrid random fiber mat.
  • Fiber composite materials with a thermosetting matrix are, for example, thermosetting prepregs, semi-finished products pre-impregnated with reactive resins.
  • the thermosetting matrix is in the uncured state or also partially crosslinked B-state.
  • Examples known to the person skilled in the art are impregnated fiber structures such as woven fabrics, braids, scrims, knitted and knitted fabrics, impregnated nonwovens or impregnated fiber strands.
  • the fiber composite material of the flat material web is selected from thermosetting prepregs, completely or not completely impregnated thermoplastic fiber composite materials. It is essential that the flat material web made of fiber composite material can be deformed by folding, so that a folded cell structure is formed. Suitable fiber composite materials for producing a folded cell structure are known to a person skilled in the art from the prior art.
  • step e) the reinforcement material and / or the flat material web is prepared for the subsequent material application.
  • preparation means process steps which are suitable for establishing a material connection between the reinforcement material and the flat material web in the following step f) the material application of the reinforcement material to the flat material web.
  • Known method steps for preparing an integral connection are, for example, the application of an adhesive, the heating, the application of a solvent. If, for example, a thermoplastic fiber composite material is to be applied as a reinforcement material to a thermoplastic polymer as a flat material web, it is advantageous if the reinforcement material to be applied and / or the thermoplastic polymer of the flat material web is heated.
  • thermoplastic matrix material and / or the thermoplastic polymer softens and, when the reinforcement material is applied to the flat material web, a material bond is established between the thermoplastic matrix material of the reinforcement material and the thermoplastic polymer of the flat material web.
  • a fiber-reinforced paper is to be applied cohesively to a flat material web as reinforcement material, it is advantageous if in step e) an adhesive is applied to the fiber-reinforced paper and / or the flat material web, so that during the subsequent application a material bond between the fiber-reinforced paper and the flat material web.
  • the person skilled in the art is familiar with suitable method steps for preparing the reinforcement material and / or the flat material web in order to achieve a cohesive To effect connection between various combinations of the material of the flat material web and the reinforcing material. It can be advantageous, after the reinforcement material has been applied cohesively to the flat material web, to carry out an additional strengthening step in which the cohesive connection is strengthened by the action of pressure.
  • step e) the reinforcement material is prepared for the subsequent cohesive application.
  • the flat material web is prepared for the subsequent material application in step e).
  • the reinforcement material and the flat material web are prepared for the subsequent material application in step e).
  • step f) the reinforcement material is applied to the flat material web in a materially bonded manner.
  • the cohesive application takes place in such a way that the reinforcement material is applied in at least one area on at least one side of the flat material web and a cohesive connection is achieved between the flat material web and the applied reinforcement material.
  • One side of the flat material web means the upper side or the lower side of the flat material web, the upper and lower sides each being a surface of the material web that is aligned along the conveying direction of the material web.
  • the reinforcement material is applied in a materially bonded manner in at least one area on the upper side or the lower side of the flat material web.
  • a one-sided reinforcement of the flat material web is thereby advantageously achieved.
  • the reinforcement material is applied cohesively in at least one area on the top and the bottom of the flat material web.
  • a two-sided reinforcement of the flat material web is thereby advantageously achieved.
  • the reinforcement material is applied cohesively in at least one area on at least one side of the flat material web, the at least one area each extending in strips on at least one side of the flat material web in the conveying direction of the flat material web.
  • the at least one area in which the reinforcement material is applied extends along the conveying direction of the flat material web in such a way that a strip-shaped zigzag area is formed.
  • the prepared reinforcing material is applied cohesively in a plurality of areas running parallel to one another along the conveying direction of the flat material web on at least one side of the flat material web. In a Embodiment different reinforcement materials are applied cohesively in several areas on at least one side of the flat material web.
  • the at least one area in which the reinforcing material is applied in a cohesive manner forms a lateral cell wall of the folded cell structure after the folding in step c).
  • At least one lateral cell wall of the folded cell structure has a reinforcement.
  • This also advantageously improves the mechanical stability of the cell structure in the thickness direction.
  • the reinforcement can also influence other properties of the cell structure in the thickness direction, depending on the reinforcement material selected, for example the thermal or electrical conductivity of reinforcement material containing carbon fibers or the optical properties of reinforcement material containing glass fibers.
  • a lateral cell wall within the meaning of the invention means a cell wall of a cell of the folded cell structure, which extends along the thickness of the cell structure and via which neighboring cells are connected to one another within the folded cell structure.
  • the thickness of the folded cell structure runs perpendicular to the conveying direction of the flat material web.
  • the flat material web is provided in the form of a thermoplastic polymer.
  • thermoplastic polymer as a flat material web advantageously enables the further thermoplastic processing of the folded cell structure to form complex geometries.
  • Thermoplastic polymers for folded cell structures are well known to those skilled in the art.
  • the reinforcement material is in the form of a
  • Fiber composite material provided.
  • the fiber composite material of the reinforcement material is preferably selected from completely or not completely impregnated, thermoplastic fiber composite materials.
  • thermoplastic fiber composite materials are advantageously suitable for reinforcing a thermoplastic polymer. It is particularly advantageous if the thermoplastic polymer of the flat material web is identical to the thermoplastic matrix material of the fiber composite material. In a preferred embodiment, the fiber composite material of the reinforcement material is provided as an endless material or as sections of an endless material.
  • the provision of the reinforcement material in the form of continuous material advantageously enables the continuous production of a folded cell structure with local reinforcement.
  • sections of the reinforcement material is advantageous if subsequent process steps, which provide for the cutting of the reinforcement material perpendicular to the conveying direction of the flat material web, are to be saved. If the reinforcement material is provided in the form of sections of an endless material, it is advantageous to align the sections during application in step f).
  • the reinforcement material is provided in the form of a fiber material.
  • step f) and before step b cuts are made in the continuously applied reinforcing material.
  • the cuts are advantageously introduced into the reinforcement material, as so-called cross-sections, perpendicular to the conveying direction of the flat material web.
  • Methods for introducing the cross-sections are known to those skilled in the art.
  • the cross-sections cut through only the reinforcement material, but not the flat material web that is cohesively connected to the reinforcement material.
  • the cross-sections are also advantageously made in regions of the reinforcement material in which a fold line for producing the folded cell structure is produced in step c).
  • the cuts are made in the cohesively applied, endless reinforcing material after step f) and after step b).
  • step b) the flat material web is pre-structured by means of plastic deformation and / or the introduction of cutting patterns.
  • thermoforming a thermoplastic polymer
  • the flat material web runs over a profiled roller and is plastically deformed by means of a vacuum.
  • Other methods known to those skilled in the art from the forming of flat materials made of paper, sheet metal or polymer are also possible.
  • a person skilled in the art is familiar with methods for introducing cutting patterns and special cutting patterns in order to form a folded cell structure in a subsequent folding process.
  • a person skilled in the art can find suggestions, for example, in DE 197 16 637 A1.
  • step b) the flat material web is pre-structured by means of plastic deformation. In a further embodiment, in step b) the flat material web is pre-structured by introducing cutting patterns. In a further embodiment, in step b) the flat material web is pre-structured by means of plastic deformation and the introduction of cutting patterns.
  • the pre-structuring of the flat material web takes place by means of plastic deformation and the introduction of cutting patterns or only by means of the introduction of cutting patterns, it is advantageous if the cuts are made in the flat material web in the same process step as the cuts in the materially applied reinforcement material.
  • the flat material web is pre-structured in step b) in such a way that in step c) a cell structure with cells open on both sides in the thickness direction is folded.
  • the cuts are made in the reinforcement material or the cut patterns are made in the flat material web by means of rotary stamping, ultrasonic cutting or remote laser cutting.
  • thermoplastic polymers are used as a flat material web in the method according to the invention for the continuous production of folded cell structures.
  • fiber composite materials are used as a flat material web in the method according to the invention for the continuous production of folded cell structures.
  • thermoplastic fiber composite materials are used as reinforcing material in the method according to the invention for the continuous production of folded cell structures.
  • thermoplastic polymers are used as reinforcing material in the method according to the invention for the continuous production of folded cell structures.
  • the invention also includes a folded cell structure with application-specific, local reinforcement.
  • the folded cell structure is preferably produced in a method according to the invention.
  • the folded cell structure with application-specific, local reinforcement consists of a flat material web of a foldable material and a reinforcement material.
  • the folded cell structure is formed from a large number of cells that have lateral cell walls. At least a part of the side cell walls has the reinforcement material and at least a further part of the side cell walls has no reinforcement material.
  • At least some of the side cell walls in the context of the invention mean that at least one cell wall of the side cell walls of each cell of the cell structure has the reinforcement material.
  • the at least one cell wall can have the reinforcing material at least in some areas.
  • by regions means that at least one region of the at least one cell wall has the reinforcing material.
  • the at least one cell wall can, however, also have the reinforcement material over the entire surface.
  • Full area means that the entire area of the at least one cell wall has the reinforcement material.
  • Adjacent cells of the folded cell structure are connected to one another via at least one further lateral cell wall, the at least one further cell wall having reinforcing material or having no reinforcing material.
  • the at least one cell wall has the reinforcement material over the entire height of the cell wall, which runs in the direction of the thickness of the cell structure.
  • the at least one cell wall has the reinforcement material over at least part of the width of the cell wall, the at least one cell wall is thus reinforced in regions.
  • the width of the cell wall extends perpendicular to the height of the cell wall. It can also be advantageous if a cell wall has the reinforcing material over the entire width of the cell wall, the cell wall is thus completely reinforced.
  • at least one side of the cell wall has the reinforcement material.
  • One side of the cell wall in the context of the invention means the inside or the outside of a cell wall, the inside of a cell wall being the side of the cell wall that is oriented towards the inside of the cell.
  • the outside of a cell wall is the side of the cell wall that connects neighboring cells within the cell structure.
  • a cell wall can have the reinforcing material on the inside and / or the outside of the cell wall. If the cell wall has the reinforcement material on one side of the cell wall, on the inside or on the outside, the cell wall is reinforced on one side.
  • a cell wall that Having reinforcing material on the inside and the outside is a cell wall reinforced on both sides.
  • the at least one further cell wall via which adjacent cells are connected to one another is a double cell wall.
  • Double cell wall means that during the folding of the cell structure, two areas of the flat material web meet and form a double cell wall.
  • a double cell wall can be constructed in different layers.
  • a double cell wall can have the following layered structure: one layer of the flat material web - two layers of the reinforcement material - one layer of the flat material web.
  • the following layer-by-layer structure can also result: one layer of reinforcement material - two layers of the flat material web - one layer of reinforcement material.
  • the following layered structure of the double cell wall is also possible: one layer of reinforcement material - one layer of the flat material web - two layers of reinforcement material - one layer of the flat material web - one layer of reinforcement material.
  • At least one further part of the lateral cell walls in the context of the invention means that at least one of the further cell walls of each cell of the cell structure does not have any reinforcing material.
  • Such a folded cell structure advantageously has a local reinforcement in the thickness direction of the cell structure.
  • Such a folded cell structure can advantageously be specifically reinforced for the application in order, for example, to achieve increased mechanical stability in the thickness direction.
  • the structural mechanical properties of the cell walls of the folded cell structure can thereby advantageously be adapted to the specific application.
  • Such a folded cell structure advantageously has an adapted deformation behavior due to the partially reinforced cell walls.
  • the functional properties of the cell structure can also be advantageously adapted depending on the choice of reinforcement material. For example, increased electrical or thermal conductivity or optical properties can be set along the thickness direction of the cell structure.
  • the flat material web can comprise any material known to the person skilled in the art that is suitable for producing a folded cell structure.
  • the flat material web is preferably a thermoplastic polymer.
  • the reinforcement material can be any material suitable for reinforcing the flat material web.
  • the reinforcement material is preferably a fiber composite material, in particular preferably a thermoplastic fiber composite material.
  • the reinforcing material is also preferably a fiber material.
  • the folded cell structure according to the invention is used as core material in sandwich elements.
  • the invention also includes a device for the continuous production of an application-specific, locally reinforced, folded cell structure.
  • the device has at least one feed device for a flat material web of a foldable material, at least one device for pre-structuring the flat material web and a device for folding the flat material web.
  • the device additionally has at least one feed device for a reinforcement material, at least one device for preparing the reinforcement material and / or the flat material web for the material application of the reinforcement material to the flat material web and at least one device for material application of the reinforcement material to the flat material web.
  • Feed devices for flat material webs are sufficiently known to the person skilled in the art.
  • a feed device for flat material webs usually comprises an unwinding unit, a unit for regulating the tension of the flat material web and a conveying unit which conveys the flat material web in the conveying direction.
  • the device for pre-structuring the flat material web is suitable for making cuts in the flat material web and in the reinforcement material, the cuts being made in the materially applied reinforcement material without severing the flat material web.
  • Feed devices for the reinforcement material are feed devices known in principle to those skilled in the art, which are also suitable for feeding the flat material web, but which are also included in the device for the continuous production of an application-specific, locally reinforced, folded cell structure.
  • the feed device for the reinforcement material comprises a creel, so that a plurality of reinforcement materials are fed in at the same time.
  • Devices for preparing the reinforcement material and / or the flat material web for the cohesive application of the reinforcement material to the flat material web are known to the person skilled in the art and include, for example, units for applying adhesive or solvent to the reinforcing material and / or the flat material web or units for heating the Reinforcing material and / or the flat sheet of material.
  • the devices for preparing the reinforcement material and / or the flat material web can advantageously be integrated into the feed devices of the flat material web and / or the reinforcement material.
  • the device for cohesive application of the reinforcement material additionally comprises a unit for solidifying the cohesive connection, such as, for example, rollers with which pressure is exerted on the flat material web and the applied reinforcement material, or units for irradiation, for example with UV light.
  • the device also advantageously has a control unit which controls the interaction of the individual devices.
  • the device according to the invention is used in a continuous process for producing a folded cell structure with local reinforcement.
  • the invention is not limited to the illustrated and described embodiments, but also includes all embodiments that have the same effect in the sense of the invention. Furthermore, the invention is not limited to the specially described combinations of features, but can also be defined by any other combination of specific features of all the individual features disclosed, provided the individual features are not mutually exclusive, or a specific combination of individual features is not explicitly excluded.
  • FIG. 1 shows schematically the individual method steps of the method according to the invention.
  • FIG. 2 schematically shows a device for carrying out the method according to the invention.
  • FIG. 3 shows schematically a section of a folded cell structure according to the invention
  • Fig. 1 the process steps of an embodiment of the inventive method are shown.
  • step a) a flat material web of a foldable material is provided.
  • step d) a reinforcement material is provided and in the subsequent step e) the reinforcement material and / or the flat material web is prepared for the cohesive application.
  • step f) the cohesive application of the reinforcement material takes place in at least one area on at least one side of the flat material web.
  • step b) the flat material web is pre-structured and finally in step c) the flat material web with the applied reinforcement material is folded into a cell structure.
  • An additional process step for making cuts in the reinforcement material takes place after step f) and before step b) or after step b).
  • thermoplastic fiber composite material is provided as reinforcement material.
  • the thermoplastic fiber composite material is a completely impregnated, thermoplastic tape as an endless material. Within the thermoplastic tape, the carbon fibers are in unidirectional form and are completely enclosed by a thermoplastic polypropylene matrix.
  • thermoplastic tape and the thermoplastic polymer are prepared for the cohesive application in that the thermoplastic tape and the thermoplastic polymer are heated in such a way that the thermoplastic softens.
  • step f) the thermoplastic tape is applied cohesively to the top of the thermoplastic polymer in several parallel strip-shaped areas, the strip-shaped areas extending along the conveying direction of the flat material web.
  • pressure is applied to the thermoplastic polymer and the thermoplastic tape in an additional process step.
  • cuts are made transversely to the conveying direction in the reinforcement material, the thermoplastic tape, without severing the flat material web.
  • step b) the flat material web pre-structured by means of thermally assisted plastic deformation and the introduction of cutting patterns. For this purpose, the material web runs over a structured, heated roller and cuts are made in the flat material web.
  • step c) the pre-structured material web is folded into a honeycomb structure.
  • a device 1 according to the invention for the continuous production of an application-specific, locally reinforced, folded cell structure is shown schematically in FIG.
  • the device 1 has a feed device for a flat material web of a foldable material, for example an unwinding unit 2. Furthermore, the device 1 comprises at least one feed device for the reinforcing material 3.
  • FIG. 2 shows several feed devices for the reinforcing material, for example unwinding units, which feed the reinforcement material to the top and bottom of the flat sheet of material.
  • the device 1 comprises at least one device for preparing the flat material web and the reinforcement material, which are each integrated into the feed devices 2, 3 and are designed, for example, as heated rollers in order to heat the flat material web and the reinforcement material.
  • the device 1 also has at least one device for cohesively applying 4 of the reinforcement material to the flat material web, which advantageously has a unit for solidifying the cohesive connection, for example pressure rollers arranged on both sides of the flat material web. Furthermore, the device 1 comprises at least one device for pre-structuring the flat material web 5.
  • a device for pre-structuring 5 is designed to introduce cutting patterns 50, for example a laser cutting head that can be moved in the conveying direction and perpendicular to the conveying direction.
  • the laser cutting head 50 is also suitable for making cuts in the reinforcing material applied in a cohesive manner without severing the flat material web.
  • At least one further device for pre-structuring 5 is designed such that the flat material web is pre-structured 51 by means of plastic deformation, for example a heated profiled roller.
  • the pre-structuring by means of plastic deformation can take place in several stages, as shown in FIG. 2.
  • the pre-structured flat material web is then folded into a cell structure 6 by means of a folding device (not shown).
  • FIG. 3 schematically shows a section of a folded cell structure 6 according to the invention.
  • the folded cell structure 6 is formed from a multiplicity of cells 7.
  • Each of the cells 7 has lateral cell walls 8.
  • At least some of the side cell walls of a cell have a reinforcing material 80 and at least another part of the side cell walls have no reinforcing material 81.
  • Adjacent cells 7 are connected to one another via at least one cell wall 82.
  • the cell walls via which neighboring cells are connected to one another 82 are designed as double cell walls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

L'invention concerne un procédé pour la préparation continue de structures cellulaires pliées dotées d'un renforcement local spécifique à l'application, ainsi qu'un dispositif pour la préparation de structures cellulaires renforcées localement de manière spécifique à l'application et une structure cellulaire pliée dotée d'un renforcement local spécifique à l'application, à partir d'une bande de matériau plate d'un matériau pliable et d'un matériau de renforcement.
PCT/EP2020/056450 2019-04-02 2020-03-11 Procédé pour la préparation continue de structures cellulaires pliées, ainsi qu'une structure cellulaire pliée WO2020200675A1 (fr)

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DE102019108580.2A DE102019108580B3 (de) 2019-04-02 2019-04-02 Verfahren und Vorrichtung zur kontinuierlichen Herstellung gefalteter Zellstrukturen, sowie gefaltete Zellstruktur
DE102019108580.2 2019-04-02

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CN114851617A (zh) * 2022-05-07 2022-08-05 哈尔滨工程大学 一种基于拉伸工艺制备的复合材料蜂窝的定型方法

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US3698879A (en) * 1954-06-10 1972-10-17 Wood Marc Sa Chevron shaped article and a sandwich structure therefrom
WO1995010412A1 (fr) 1993-10-14 1995-04-20 Hexcel Corporation Nid d'abeilles metallique a haute conductibilite thermique et angle d'inclinaison de fibres optimum
WO1997003816A1 (fr) 1995-07-18 1997-02-06 Katholieke Universiteit Leuven Structure alveolaire en accordeon
DE19606195A1 (de) 1996-02-21 1998-09-10 Pflug Jochen Dipl Ing Fh Faltwabe
DE19716637A1 (de) 1997-04-21 1998-10-22 Pflug Jochen Dipl Ing Fh Faltwabe und Verfahren zu deren Herstellung
US5855984A (en) * 1993-01-10 1999-01-05 3-D Composites Limited Composite article and method for manufacturing the same
WO2000032382A1 (fr) 1998-10-24 2000-06-08 K.U.Leuven Research & Development Corps alveolaire thermoplastique en accordeon et son procede de production
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US3698879A (en) * 1954-06-10 1972-10-17 Wood Marc Sa Chevron shaped article and a sandwich structure therefrom
US5855984A (en) * 1993-01-10 1999-01-05 3-D Composites Limited Composite article and method for manufacturing the same
WO1995010412A1 (fr) 1993-10-14 1995-04-20 Hexcel Corporation Nid d'abeilles metallique a haute conductibilite thermique et angle d'inclinaison de fibres optimum
WO1997003816A1 (fr) 1995-07-18 1997-02-06 Katholieke Universiteit Leuven Structure alveolaire en accordeon
DE19606195A1 (de) 1996-02-21 1998-09-10 Pflug Jochen Dipl Ing Fh Faltwabe
DE19716637A1 (de) 1997-04-21 1998-10-22 Pflug Jochen Dipl Ing Fh Faltwabe und Verfahren zu deren Herstellung
WO2000032382A1 (fr) 1998-10-24 2000-06-08 K.U.Leuven Research & Development Corps alveolaire thermoplastique en accordeon et son procede de production
US6726974B1 (en) 1998-10-24 2004-04-27 K.U. Leuven Research & Development Thermoplastic folded honeycomb structure and method for the production thereof
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