EP2094412B1 - Élément structurel constitué d'un matériau plat, et son procédé de fabrication - Google Patents

Élément structurel constitué d'un matériau plat, et son procédé de fabrication Download PDF

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Publication number
EP2094412B1
EP2094412B1 EP07825270.7A EP07825270A EP2094412B1 EP 2094412 B1 EP2094412 B1 EP 2094412B1 EP 07825270 A EP07825270 A EP 07825270A EP 2094412 B1 EP2094412 B1 EP 2094412B1
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EP
European Patent Office
Prior art keywords
bending edges
deforming
cell
flat material
cell bending
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
EP07825270.7A
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German (de)
English (en)
Other versions
EP2094412B8 (fr
EP2094412A1 (fr
Inventor
Jochen Ellert
Arno Behrens
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Ellert Jochen
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Individual
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Publication of EP2094412A1 publication Critical patent/EP2094412A1/fr
Application granted granted Critical
Publication of EP2094412B1 publication Critical patent/EP2094412B1/fr
Publication of EP2094412B8 publication Critical patent/EP2094412B8/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/10—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form into a peculiar profiling shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/324—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with incisions or reliefs in the surface

Definitions

  • the invention relates to a component made of a flat material with a located between two main surfaces parallel to each other central surface, wherein the flat material is provided with a deformation structure which extends in the manner of a pressure partially perpendicular to the central surface according to the preamble of claim 1.
  • the Deformation structure is introduced in the main shape direction perpendicular to the central surface and will generally have the characteristic for Beulmuster parabolic depressions relative to the central surface, while the Beulr selected at least partially with respect to the central surface have a directed against the main shape, grandeur.
  • Components of this type are for example of the generic type DE-C2-100 06 348 or the DE-A1-197 50 576
  • the latter describes a method for the production of buckling structures in the rolling process.
  • the deformation structure essentially serves to increase the rigidity of the flat material, but there the stiffening effect is reduced by concentric counterbumps introduced at the bottom of the bump.
  • U1 serves the structuring of the stiffening of the sheet.
  • Such a stiffness increase is according to the DE-A1-197 50 576 especially for vehicle construction, but in principle also for all flat components, of interest.
  • a disadvantage of the known components is that their increase in stiffness soon reaches its limits. Therefore, this invention is based on the object, a component of the type mentioned in such a way that it has a greater rigidity.
  • this is done by a component having the features of claim 1.
  • This results in a structure that is designed not only bulging in the pressing direction, but also against the pressing direction relative to the central surface at least partially has a sublime in the Beulrändem. Both deformations, so the Bumps in combination with the grandeur of the edge zones result in a higher resistance to applied bending stresses.
  • This combination of buckling reinforcement and the partial grandeur of the Beulr is also the local stretching of the sheet is increased in the region of a bump to be created, whereby an additional stiffening effect is caused.
  • this method can be integrated as a secondary feature in deep drawing or stretching operations known per se, etc., and allows flat edge zones adjacent to the structural form field. It also makes possible a subsequent, possibly partial, further deformation of pre-formed components.
  • the determination of the optimal cell size according to the invention is carried out according to the principle of minimum energy expenditure for buckling and can be carried out on the basis of finite element analyzes.
  • the structural form tool can be constructed from modules that allow for flexibilization of assembly, reduction of manufacturing costs and improvement of maintenance.
  • the invention further relates to a method for producing such a component, which has the features of claim 4.
  • the pressing force for generating the bumps and the grandeur of the Beulrandzonen on elastic active media (or the like) is applied to the component.
  • the targeted generation of local instabilities also causes the bumps to jump abruptly into the cavities of the tool and shape their geometry independently (freely) and paraboloidally, so that not, as in a stamping process, the bumps are formed in a correspondingly shaped cavity of the counter-tool.
  • a produced deep-drawn component 1 ( Fig. 1a ) has a smooth flange 2, while a structural field 4 itself, including the elevations of Zellbiegers 14, in the context of a deep drawing operation in the sheet material (sheet metal or plastic) is introduced as a slightly raised auxiliary element 3.
  • the deformation structure 4 preferably has the form of a periodic lattice of cells, for example hexagonal cells 5, arranged next to one another.
  • hexagonal cells are by no means limited thereto. Because it is quite possible within the scope of the invention to provide instead of a continuous grid also on the deep-drawn bottom surface of the component 1 distributed individual, in particular cell-like deformations, although it is of course clear that in the illustrated complete grid, the stiffening effect is greater.
  • cells need not be hexagonal, but may also consist of triangles, rectangles, double trapezoids, rhomboids, as well as rhomboid, octagonal, with two opposing webs stretched (ie asymmetric) hexagons, etc., with straight or curved edges that the Surround recesses. In doing so, aesthetically pleasing patterns can be achieved with curved bars. Combinations with differently shaped cells or bump edges are also possible.
  • the deep-drawing tray contains the three-dimensional deformation structure 4, the material (sheet metal, it can also be plastics) remains in the deep-drawing flange 2 (due to the action of the tool holder) its flat shape.
  • the built in the segments of Tiefziehwerkmaschinemaschinees sublimities lead to an increase of the Zellbieger section 14th
  • Fig. 2a and b For example, three of the hexagonal cells 5 are contiguous and enlarged.
  • the arrangement of the hexagonal cells is expedient, as is known from honeycombs, because usually the largest stiffening is achieved.
  • the special feature of this embodiment is the structure of the individual cells. For example, if there is a longitudinally oriented sheet metal workpiece, usually the diagonal Beulbegrenzungsstege in the longitudinal direction, the transverse webs oriented at right angles to the longitudinal axis.
  • the special design of the in the Fig. 2a, 2b cell 5 is now that the diagonal boundary webs or Zellbieger selected 14 are provided with the main shape direction opposing arches, ie with respect to the central surface 8 plus the proportionate material thickness 12 have a sublimity ( Fig.
  • the excessive diagonal cell boundary webs thus form a line 16, namely a zigzag line, which extends over the entire structured field surface of the workpiece 4 and also already in 1a can be seen.
  • the arrangement of these webs is arbitrary, preferably in line form, but produces the greatest effect in the zig-zag arrangement.
  • the Fig. 3a shows the position of the major surfaces 7, 9 of the sheet before deformation, wherein the sheet has a central surface 8 and a material thickness 12.
  • FIG. 3b shows a deformation structure with a cell 5 in a flat material having the central surface or center plane 8.
  • the cell-like recess 5 is now designed so that the flat material from the central surface 8 in a single direction to form a cell recess 10 is arcuate.
  • This recess 10 has a width 6 and a height 13. Its tangent forms the central surface 8 a relatively shallow angle ⁇ , so that the recess 10 can be relatively easily compressed upon exertion of pressure on them.
  • the shape according to the invention is compared Fig. 3c (Where the flat material also has an upper and a lower main surface 7, 9) with the in the Symmetriesammlung expedient parabolic recess 10, it can be seen that the cell 5 has a relation to the central surface 8 outgoing raised cell bending edge 14 (plus the proportionate material thickness 12), which has a height (11) at the maximum in the middle of the diagonal webs. Due to the longer training of the cell 5 and its recess 10 bounding wall results here one (compared to the Fig. 3b ) Steeper tangent that extends at an angle ⁇ to the central surface 8, and therefore also causes a greater resistance to pressure.
  • the production of a localized deformation structure can be done in any way, even by that from the DE-A1-197 50 576 Known rolling process, but for their production, the rollers must be separated again and again from each other. Moreover, because of the resulting sheet curvature, then a straightening process is required for straightening, with some of the stiffness gain being lost again. Furthermore, the rolling process limits a regularly paraboloidal buckling formation, which is advantageous for the purposes of this invention.
  • Exemplary of a pressing operation advantageously used according to the invention is a C-press frame 21 in FIG Fig. 4 represented, with which the deformation structure according to the invention can be pressed in flat materials.
  • This press has a base 25 on which a structural tool 24 is fixed in a known manner.
  • a plate 23 of resilient, suitably elastic material of certain hardness is lowered onto the structural tool 24 to press the inserted between the tool and the plate 23 flat material with the main surface 9 against the structural tool 24.
  • the elastomer plate 23 is held by a pressure plate carrier 22 on the C-frame 21 and acts on the main surface. 7
  • the method can also be applied in multi-acting pressing systems.
  • deep-drawing and stretch-drawing tool systems may be mentioned in which the structuring tool is integrated so that, in addition to the main shaping of the sheet, complete or partial structuring in the form according to the invention can be integrated.
  • Fig. 5 illustrates such a deep drawing process, in which deep-drawn and structured in the same operation. Shown is a pressure plate 23 which is fixed in a die 26. In the main shaping can be done so the pulling of the component. Position 3 shows the drawing bowl and position 2 the drawing flange.
  • Fig. 6 It illustrates Fig. 6 in that the individual plates 23 and structural tools 24 do not always have to be completely flat, but that even slightly curved flat materials can be provided with structuring in the manner shown. Under certain circumstances, however, the structuring tool can not be constructed from modular individual elements. Such a curved structure can not be produced by the roll patterning method.
  • Fig. 7a to 7d Let the corner region of the structure tool 24 be illustrated.
  • a base plate 20 of the structural tool 24 the hexagonal shape after Fig. 1 a resulting, individual modules attached, for example, screwed so that the modules are replaceable, if required by wear or as a result of a transformation of the deformation structure.
  • These individual modules comprise once such modules 17, which form the arcuate elevations of the edge zones of the bulge pattern, and those modules 18, which form the not exaggerated edge zones of the bulge pattern. But it is also possible to dispense with the individual modules and provide modules that include a whole Beulzelle. In addition, the entire structural shape field can be worked out of the full tool material. All modules are advantageously using clamping plates (in plan view below) via mounting holes 19 attached to the tool base plate 20. In the top view above, this clamping plate has been omitted for illustration.
  • the higher Beulbiegers the tool 17 with a outward or from the related to the material to be deformed material 8 facing away sheet provide (which reduces the required pressing forces), as particularly the FIGS. 7 show, but also any other shape could be selected, for example, a double bow od.
  • the arches of the Beulr applications can also be directed inward, that is approximately concave, but this is not preferable.
  • Bows may also be provided at the lower bowing edges of the tool 18, as long as their upper edge does not extend beyond the major surface 7, relative to the material being deformed. Such sheets may preferably be concave.
  • the cell well 10 ( Fig. 3c ) have a flattening or upward-pointing indentation (counterbump).
  • the method of which a preferred embodiment has been described may be modified in a variety of ways.
  • the position of the plates 23, 24 can be exchanged, so that approximately the plate 24 is at the top.
  • a non-compliant die plate with negative engraving to the plate 24 may be used, but this is generally not cost effective.
  • components provided with this mold structure can be further deformed by utilizing the special geometry shape, which can further increase the stiffening effect.
  • a particular variant of the invention may consist in introducing into a component by the mold structure according to the invention verses initiating sites, for example to allow a component to buckle at a certain load, e.g. in order to allow energy absorption in the event of a strong pulse-like load.
  • Another special feature of the invention may be that a component after the main shaping, even after assembly, with appropriate tools (also pliers) can be provided with the inventive mold structure.

Claims (10)

  1. Pièce (1) en matériau plat comprenant une face centrale (8) disposée entre deux faces principales (7, 9) parallèles entre elles, sachant que le matériau plat est doté d'une structure de déformation (4) qui est partiellement verticale à la face centrale (8), à la manière d'une compression, sachant
    a) qu'au moins une zone partielle (5) du matériau plat est dotée de la structure de déformation (4) ; et
    b) que la structure de déformation (4) est composée d'une grille de cellules (5) adjacentes les unes aux autres, de préférence presque au moins hexagonales en vue de dessus, sachant que les cellules sont délimitées par des bords de cellule courbés (14) et (15) transversaux à la face centrale (8),
    caractérisé en ce
    c) qu'une cellule (5) délimitée par des bords de cellule courbés relativement plus hauts (14) et relativement plus bas (15), présente un creux (10) s'étendant en-dessous de la face principale (9), alors que les bords de cellule courbés plus hauts (14) sont formés jusqu'à une hauteur (11) au-dessus de la face centrale (8) et les bords de cellule courbés plus bas (15) sont formés essentiellement jusqu'à la hauteur d'une face principale (7).
  2. Pièce selon la revendication 1, caractérisée en ce que les bords de cellule courbés plus hauts remplissent au moins l'une des conditions suivantes :
    a) lors de la formation d'une grille de cellules (5) adjacentes les unes aux autres, les bords de cellule courbés plus hauts (14) passent le long d'une ligne (16) de préférence ininterrompue (Fig. 1 a) ;
    b) les bords de cellule courbés plus hauts (14) sont dotés au moins partiellement en vue latérale, c'est à dire en coupe, d'un bombement arqué partant de la face centrale (8).
  3. Pièces selon l'une des revendications précédentes, caractérisée en ce que les creux (10) sont conçus au moins dans une zone partielle des cellules (5) en tant que bosses concaves, par exemple paraboliques en coupe.
  4. Procédé de fabrication d'une pièce selon l'une des revendications précédentes, dans lequel, dans un matériau plat d'épaisseur (12), délimité par des faces principales (7, 9) parallèles entre elles, est insérée une structure de déformation (4) en forme de creux (10) cellulaires délimités par des bords de cellule courbés (14, 15) à l'aide d'outils de déformation (24, Fig, 5, 6 et 7), caractérisé en ce que les cellules (5) délimitées par des bords de cellule courbés relativement plus hauts (14) et relativement plus bas (15) présentent des creux (10) allant jusqu'à la hauteur (13), en-dessous de la face (9), tandis que les bords de cellule courbés plus hauts (14) sont formés jusqu'à une hauteur (11) au-dessus de la face centrale (8) et les bords de cellule courbés plus bas (15) sont formés essentiellement jusqu'à l'hauteur d'une face principale (7) et que les creux (10) ainsi que les bords de cellule courbés (14, 15) sont essentiellement déformés en même temps.
  5. Procédé de fabrication d'une pièce selon l'une des revendications précédentes, caractérisé en ce que la structure de déformation (4) par rapport à la face centrale (8) est intégrée dans un outil de mise en forme principale formé en tant qu'outil de compression, d'emboutissage ou d'étirage, de telle sorte que la mise en forme secondaire peut avoir lieu essentiellement au cours de la même étape de procédé que la mise en forme principale.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la structure de déformation (4) n'est intégrée que dans une zone partielle de la pièce et que les outils de déformation (24, Fig, 5, 6 et 7) sont ainsi conçus qu'une zone partielle de la structure de déformation (4) ou que seulement une cellule (5) individuelle est formée.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que la force de compression pour produire les cellules (5) ainsi que la proéminence des bords de cellule courbés (14, 15), est appliquée sur la pièce (1) par au moins une face (23) souple, en particulier élastique, et que de préférence, les outils de déformation (24, Fig, 5, 6 et 7) sont fixés sur un support d'outil essentiellement en forme de plaque, par exemple plan (Fig. 5) mais aussi bombé (Fig. 6) qui, dans un procédé de compression, est comprimé contre une surface (23) souple, opposée aux outils de déformation et essentiellement en forme de plaque.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que les outils de déformation (24) sont montés sur un support (20) composés d'éléments ou modules (17, 18) individuels.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que dans une pièce ou un matériau plat, la structure de déformation (4) selon l'invention est produite par des opérations successives en enfilade l'une sur l'autre ou par des champs de mise en forme comprimés en forme par une pluralité d'opérations individuelles.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une pièce ou un matériau plat continue d'être déformé avec la structure de déformation (4) selon l'invention.
EP07825270.7A 2006-11-23 2007-09-28 Élément structurel constitué d'un matériau plat, et son procédé de fabrication Not-in-force EP2094412B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610055657 DE102006055657A1 (de) 2006-11-23 2006-11-23 Bauteil aus einem Flachmaterial und Verfahren zu seiner Herstellung
PCT/IB2007/002948 WO2008062263A1 (fr) 2006-11-23 2007-09-28 Élément structurel constitué d'un matériau plat, et son procédé de fabrication

Publications (3)

Publication Number Publication Date
EP2094412A1 EP2094412A1 (fr) 2009-09-02
EP2094412B1 true EP2094412B1 (fr) 2014-09-10
EP2094412B8 EP2094412B8 (fr) 2014-10-22

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EP07825270.7A Not-in-force EP2094412B8 (fr) 2006-11-23 2007-09-28 Élément structurel constitué d'un matériau plat, et son procédé de fabrication

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EP (1) EP2094412B8 (fr)
DE (1) DE102006055657A1 (fr)
WO (1) WO2008062263A1 (fr)

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EP2094412B8 (fr) 2014-10-22
EP2094412A1 (fr) 2009-09-02
DE102006055657A1 (de) 2008-05-29

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