EP2991822B1 - Procédé pour fabriquer des ames en nid d'abeilles ductiles - Google Patents

Procédé pour fabriquer des ames en nid d'abeilles ductiles Download PDF

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Publication number
EP2991822B1
EP2991822B1 EP14731138.5A EP14731138A EP2991822B1 EP 2991822 B1 EP2991822 B1 EP 2991822B1 EP 14731138 A EP14731138 A EP 14731138A EP 2991822 B1 EP2991822 B1 EP 2991822B1
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EP
European Patent Office
Prior art keywords
folded
honeycomb
web
expansion
sheet
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.)
Not-in-force
Application number
EP14731138.5A
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German (de)
English (en)
Other versions
EP2991822A1 (fr
Inventor
Stefan LIPPITSCH
Christian Korn
Marcus Herzberg
Max Britzke
Jan Hendrik HEROLD
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.)
Technische Universitaet Dresden
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Technische Universitaet Dresden
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Publication of EP2991822A1 publication Critical patent/EP2991822A1/fr
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Classifications

    • 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

Definitions

  • the invention relates to a method for the production of moldable honeycomb cores according to the preamble of claim 1.
  • Plate-shaped sandwich composites usually consist of two cover layers, which are shear-resistant connected with a light core layer. Based on this structure, advantageous mechanical properties of the composite result with comparably low weight.
  • Cores for sandwich composites especially cores having a void structure (e.g., honeycomb structure) typically have a significantly lower density than the liners.
  • a void structure e.g., honeycomb structure
  • a variant of a core with a cavity structure are hexagonal honeycomb cores.
  • hexagonal honeycomb cores are produced as unexpanded paper honeycomb cores for the field of furniture and interior design as well as for related areas and are only expanded immediately prior to the production of the sandwich panels, which entails the advantage of a very low transport volume.
  • sandwich panels with such cores enable high specific compressive strengths across the board plane, an enormous weight saving and a reduced consumption of raw materials.
  • Conventional hexagonal honeycomb cores consist of a honeycomb-like, hexagonal structure, which is formed by the gluing of paper strips k of defined thickness s and subsequent expansion, expansion.
  • the direction of production X is the direction in which it is expanded.
  • a three-dimensional view of a clipping is going in Fig.2 and a single cut out cell as a top view Fig. 3 shown.
  • the regions of the bond are referred to as double webs a1 and the non-bonded regions as simple webs a2. With most production plants a variety of core heights h can be produced.
  • honeycomb cores there are already different three-dimensionally formable honeycomb cores.
  • a honeycomb core is for example from the EP 0 955109 A2 known.
  • Such structures are complex in their production and also do not offer the possibility of transport to the final processor in the unexpanded state.
  • three-dimensionally deformable cores are expensive and are used only for a few applications. They consist, for example, of aramid fiber paper, which is impregnated with resin after being formed, or of aluminum.
  • the 3-d expansion honeycomb consists of individual web layers / folded paper strips of thickness s, which are connected to one another by alternately following double webs b1 and simple webs b2, so that upon expansion a honeycomb-like structure is formed. The connection is made by the strip sections are glued together in the region of the double webs.
  • the simple webs b2 of the 3-d expansion honeycomb additionally have predetermined bending lines which divide the simple webs into three regions b2.1, b2.2, b2.3.
  • This structure allows the defined folding of the honeycomb core formed in the transverse and / or longitudinal direction and at the same time increases the compressive strength of the sandwich composite.
  • it is also possible to produce one-dimensional and two-dimensional sandwich composites.
  • other raw materials such as aramid fiber paper with subsequent impregnation of resin or aluminum can be used.
  • the 3-d expansion honeycomb can be manufactured in any desired core heights h.
  • honeycomb cores Components with conventional honeycomb cores have significantly reduced strength values due to the buckling or tearing of webs in the case of two- or three-dimensional deformation on. Therefore, such honeycomb cores are rarely used for two-dimensionally or three-dimensionally shaped components.
  • a variant of the application is the use of petroleum-based foams (eg polyurethane foams) as the core layer of three-dimensional sandwich elements, which in some cases is also combined with the use of conventional honeycomb cores.
  • foams eg polyurethane foams
  • the production of such a sandwich composite is relatively expensive and disadvantageous for later recycling.
  • Sandwich composites of the type discussed here can be implemented as a one-dimensional plate as well as a two-dimensional or three-dimensionally shaped component.
  • two- and three-dimensionally shaped components are increasingly used in industries such as aircraft, automotive, caravan construction, ship and boat building, but also in furniture and exhibition construction and in immobile interior design.
  • the cover layers usually consist of correspondingly deformable materials such as plastic, metal, wood and wood-based material or (natural) fibers.
  • the US 2012 / 0205035A1 describes a method for producing a honeycomb core.
  • a planar web is moved by a pair of rollers that converts the web into a ribbed web.
  • the ribbed web has flat valley sections and also flat cover sections, which are connected to one another by connecting sections of the web.
  • the ribbed web is cut and folded to obtain the desired honeycomb core. Subsequently, this can be provided with a cover and a base.
  • the object of the present invention is to provide an industrially applicable method for producing the 3-d expansion honeycomb with improved technology.
  • sheet or sheet-shaped flat product consisting mostly of paper, alternatively, from other starting materials such as aramid fiber paper with subsequent resin impregnation or aluminum processed.
  • connecting elements or means for joining the individual web layers / folded paper strips such as e.g. Adhesive used.
  • the complex transformation required for the production of the 3-d expansion honeycomb is achieved in several successive substeps.
  • the possibly present fiber orientation of the material to be processed as well as the deflections and fold lines introduced during processing lie parallel to the machine direction of rotation (MLR).
  • the folded sheet or the fold path is alternately cut from above and below at a distance of the later core height h to the whereabouts of only one paper thickness transverse to the machine direction and the coherent blocks thus formed by folding around the remaining processing material and the 3rd -d expansion honeycomb pressed.
  • the application of adhesive can take place before or after the cutting.
  • webs / folded paper strips are separated from the folding sheet or the folding web transversely to the machine direction and lined up by pressing them about the longitudinal axis in the correct position to form double webs of the 3-d expansion honeycomb and compressed.
  • the application of adhesive can take place before or after the separation. The distance between the two cuts gives the core height h.
  • a plurality of folded sheets or folding webs are adhesively bonded to one another in the correct position to form double webs.
  • the processing takes place further in that at the same time several, already bonded web layers / folded paper strips are separated transversely to the machine direction and these aligned in the same direction to form double webs of the 3-d expansion honeycomb and pressed to the 3-d expansion honeycomb.
  • the second application of adhesive may take place before or after the separation of the already glued folded sheets or folding paths. The distance between the two cuts gives the core height h.
  • a plurality of signatures or folds are glued together in the correct position assignment to form double webs. From the resulting block, the 3-d expansion honeycomb in any core height h is separated.
  • the meander-shaped structure is formed with substantially horizontal and vertical surfaces in a pronounced Zinnenfriesform or with larger radii at the transitions, to a complete curvature of the horizontal sections.
  • the mold rails are designed in such a way that all required deflections of the folded sheet or the fold web are introduced into the processed good by multiple, parallel longitudinal folding.
  • the mold rails can be correspondingly shaped individual parts or assemblies with correspondingly shaped individual elements.
  • a form of rail is characterized in that it introduces the required deflections in the processed material during conveyance through the mold rail assembly. For this vertical elevations of the form rail of the meandering shape along the Increase the rail to the folded sheet or to the folding path and reduce the height of the rail, so that the deformation can take place without unwanted mechanical impairment of the processed material. Vertical indentations of the mold rail, which increase along the mold rail, provide the space needed for the forming.
  • individual mold rails can be moved relative to the rest to reduce the required conveying forces.
  • a flow around the mold rails with air and thus a reduction of the conveying forces can be achieved. But it can also find other lubricants application.
  • a flat, bow-shaped or web-shaped processing material is conveyed into or through a die.
  • the resulting shape consists of alternating vertically and horizontally contiguous surfaces. Transverse to the machine direction Y thus creates a meandering, in the example Fig. 6 a pinnacle frieze shape.
  • the result of this first parting process can also be a cross section that is slightly different from the Zinnenfries form.
  • the deflections between vertical 5 and horizontal surfaces 4 can also be performed with a larger radius.
  • up to the complete curvature of the horizontal surfaces Fig. 9 ,
  • the existing meandering shape is further formed by L Lucassfalzen to the folded sheet or Falzbahn.
  • special tools mold rails are necessary, which bring in all the required fold lines during conveying of the processing material by a multiple, parallel Leksfalzen.
  • the horizontal surfaces 4, Figure 7 extended to a part of the previously vertical surfaces 5a. The remaining area is formed in a zigzag pattern 5b, c, d.
  • a section of the processed material during the Forming provides Fig. 7 It is not absolutely necessary that the bending lines be introduced with sharp-edged tools.
  • the tools may, for example, also be designed so that the edges required for the forming are designed with a radius 5r decreasing along the tool.
  • the resulting folding pattern is compressed by means of suitable aids, such as a roller pair, whereby the fold lines are finally formed on the deflections, Fig. 8 ,
  • suitable aids such as a roller pair
  • the fold lines are finally formed on the deflections, Fig. 8 .
  • Fig. 1 this form exists between section 1.2 and 1.3.
  • the introduced fold lines act in the later honeycomb core like hinges between the surfaces.
  • the enlarged horizontal surfaces 4 + 5a, Figure 8 form the double webs b1 in the expanded state of the 3-d expansion honeycomb, Figure 4 and the zigzag folded surfaces 5b, c, d, Figure 8 the simple webs b2.1, b2.2, b2.3, Figure 4 ,
  • a kind of constantly changing ornament emerges from one long and three shorter lines.
  • the lines are connected via deflections, transferred to the room these are the fold lines.
  • the pattern can be mirrored by half of the long lines, as exemplified in Fig. 8 is illustrated with the mirror image plane 5s and the sections a and a '.
  • Fig.1 For the further processing of the folding sheet or the folding path to the 3-D expansion honeycomb there are several possible embodiments.
  • One is in Fig.1 exemplified with.
  • a side view of this process is in Fig. 10 shown. It is the folded material to be processed in the area of the later double webs first adhesive on one side. This is done between section 1.2 and 1.3.
  • the folding pattern is cut to the last layer of the processed material and hinged around 180 °.
  • the previously applied adhesive layer on the double webs causes the material connection of the individual hitherto only hinge-like sections to the 3-d expansion honeycomb.
  • Another way to make the 3-expansion honeycomb from the fold sheet or the fold path is to separate strips from the folding pattern, apply these before or after the separation with adhesive and handle the individual folding pattern strips so that they glued and accordingly compressed form the 3-d expansion honeycomb, Fig. 11 ,
  • the folding pattern can be previously glued together already in several versions Fig. 12 ,
  • the unexpanded honeycomb core can be expanded in two directions to the 3-d expansion honeycomb.
  • the expansion can be temporally and spatially offset, similar to the expansion of conventional hexagonal honeycomb cores, carried out only at the user.
  • Another way to inexpensively transport and store the 3-d expansion honeycomb is to fully expand the 3-d expansion honeycomb already in the manufacturing process and repress the machine direction in just one dimension.
  • the 3D expansion honeycomb is transported and stored in a space-saving and cost-effective manner.
  • the advantage of this design is that expanders for conventional honeycomb cores can also be used to expand the 3D expansion honeycomb and so the user does not need to provide new machine technology.
  • the presented method for producing the 3d expansion honeycomb can work continuously or discontinuously.
  • sheets or webs can be processed.

Landscapes

  • Laminated Bodies (AREA)

Claims (7)

  1. Procédé pour fabriquer des âmes en nid d'abeilles ductiles par
    1.1 mise en forme d'un matériau à transformer étant plat, en forme de feuille ou de bande en une structure en forme de méandres avec des surfaces passant pour l'essentiel horizontalement (4) et verticalement (5),
    1.2 traitement ultérieur en nid d'abeilles d'expansion tridimensionnel, caractérisé par les autres étapes suivantes :
    1.3 incorporation d'un modèle de pliage dans les surfaces verticales (5) de la structure en forme de méandres par pliage longitudinal le long du sens de la marche de la machine, les surfaces horizontales (4) étant agrandies d'une partie (5a) des surfaces préalablement verticales (5) et les surfaces (5) verticales préalables restantes étant reformées en un modèle en zigzag (5b,c,d),
    1.4 configuration à bords vifs des lignes de pliage en feuille de pliage ou en bande de pliage.
  2. Procédé selon la revendication 1, caractérisé en ce que la feuille de pliage ou la bande de pliage est entaillée alternativement par le haut et le bas à distance de la hauteur d'âme ultérieure jusqu'au maintien uniquement d'une épaisseur de papier transversalement au sens de marche de la machine, les blocs formés continus sont mis en place par rabattement autour du produit à transformer restant et comprimés en un nid d'abeilles d'expansion tridimensionnel, la stabilité étant réalisée par un adhésif appliqué avant ou après la séparation.
  3. Procédé selon la revendication 1, caractérisé en ce que des couches d'âme/bandes de papier pliées sont séparées de la feuille de pliage ou de la bande de pliage transversalement au sens de la marche de la machine et sont juxtaposées et comprimées par rotation correspondante autour de l'axe longitudinal en position exacte pour former des âmes doubles (b1) du nid d'abeilles d'expansion tridimensionnel, l'application d'adhésif pouvant avoir lieu avant ou après la séparation.
  4. Procédé selon la revendication 1, caractérisé en ce que des couches d'âme/bandes de papier pliées sont séparées de plusieurs feuilles de pliage ou bandes de pliage collées l'une à l'autre, transversalement au sens de la marche de la machine, celles-ci recevant un adhésif avant ou après séparation et étant ensuite jointes en position exacte pour former des âmes doubles (b1) en nid d'abeilles d'expansion tridimensionnel.
  5. Procédé selon la revendication 1, caractérisé en ce qu'une pluralité de feuilles de pliage ou de bandes de pliage sont collées dans un ordre de position exacte pour former des âmes doubles (b1) et le nid d'abeilles d'expansion tridimensionnel est séparé du bloc créé.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la structure en forme de méandre est constitué avec des surfaces passant pour l'essentiel horizontalement (4) et verticalement (5) en une forme de frise crénelée caractéristique ou avec une courbure dans la section horizontale.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'incorporation du modèle de pliage dans les surfaces de la structure en forme de méandres a lieu par la mise en oeuvre d'éléments de guidage de trajectoire correspondants pendant l'avance de la feuille ou de la bande.
EP14731138.5A 2013-05-03 2014-04-30 Procédé pour fabriquer des ames en nid d'abeilles ductiles Not-in-force EP2991822B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013008026.6A DE102013008026A1 (de) 2013-05-03 2013-05-03 Verfahren zur Herstellung von formbaren Wabenkernen
PCT/DE2014/000226 WO2014177132A1 (fr) 2013-05-03 2014-04-30 Procédé de production de rayons moulables

Publications (2)

Publication Number Publication Date
EP2991822A1 EP2991822A1 (fr) 2016-03-09
EP2991822B1 true EP2991822B1 (fr) 2017-07-12

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EP14731138.5A Not-in-force EP2991822B1 (fr) 2013-05-03 2014-04-30 Procédé pour fabriquer des ames en nid d'abeilles ductiles

Country Status (3)

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EP (1) EP2991822B1 (fr)
DE (1) DE102013008026A1 (fr)
WO (1) WO2014177132A1 (fr)

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DE102019113067B3 (de) * 2019-05-17 2020-10-22 Technische Universität Dresden Verfahren zur Herstellung eines flexibel formbaren Wabenkerns, Verwendung des Wabenkerns sowie Vorrichtung zur Durchführung des Verfahrens

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US8539737B2 (en) 2008-09-19 2013-09-24 Ford Global Technologies, Llc Twelve-cornered strengthening member
US10704638B2 (en) 2016-04-26 2020-07-07 Ford Global Technologies, Llc Cellular structures with twelve-cornered cells
US10393315B2 (en) 2016-04-26 2019-08-27 Ford Global Technologies, Llc Cellular structures with twelve-cornered cells
US10279842B2 (en) 2016-08-30 2019-05-07 Ford Global Technologies, Llc Twenty-eight-cornered strengthening member for vehicles
US10429006B2 (en) * 2016-10-12 2019-10-01 Ford Global Technologies, Llc Cellular structures with twelve-cornered cells
US11292522B2 (en) 2019-12-04 2022-04-05 Ford Global Technologies, Llc Splayed front horns for vehicle frames
USD1004290S1 (en) 2020-07-29 2023-11-14 3M Innovative Properties Company Sheet with slits
USD971019S1 (en) 2020-07-29 2022-11-29 3M Innovative Properties Company Extended sheet
USD946907S1 (en) 2020-07-29 2022-03-29 3M Innovative Properties Company Sheet with slits
USD1016497S1 (en) 2020-07-29 2024-03-05 3M Innovative Properties Company Expanded sheet

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Publication number Publication date
DE102013008026A1 (de) 2014-11-06
EP2991822A1 (fr) 2016-03-09
WO2014177132A1 (fr) 2014-11-06

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