EP1253983A1 - Piece comportant des zones de renforcement localisees, et son procede de production - Google Patents

Piece comportant des zones de renforcement localisees, et son procede de production

Info

Publication number
EP1253983A1
EP1253983A1 EP01913784A EP01913784A EP1253983A1 EP 1253983 A1 EP1253983 A1 EP 1253983A1 EP 01913784 A EP01913784 A EP 01913784A EP 01913784 A EP01913784 A EP 01913784A EP 1253983 A1 EP1253983 A1 EP 1253983A1
Authority
EP
European Patent Office
Prior art keywords
component
rigidity
stiffness
region
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.)
Withdrawn
Application number
EP01913784A
Other languages
German (de)
English (en)
Inventor
Hans Herzog
Wolfgang KLEINEKATHÖFER
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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1253983A1 publication Critical patent/EP1253983A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/152—Front or rear frames
    • 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
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing

Definitions

  • the invention relates to a component made of high-strength sheet metal, which is provided with a stiffness-increasing deformation structure in a locally limited stiffening area, and to a method for its production
  • DE 1 96 34 244 a method for increasing the stiffness-structuring of metal sheets is known, with the aid of which a sheet metal plate is dented in several stages from both sides. Periodic patterns of large dents are formed, in the dents of which small dents are formed on the opposite side. This surface structure ensures that very good pressure and bending stiffness, however the buckling method proposed for its manufacture can only be used on very thin sheets and is therefore not suitable for increasing the rigidity of structural components, e.g. for vehicle construction. Furthermore, DE 1 96 34 244 describes a buckling method in a continuous process, in which the entire surface of a raw sheet is provided with dents. On the one hand, a targeted local increase in the stiffness of the raw sheet is not possible, on the other hand, the buckling structure and thus the increase in stiffness obtained would largely be lost in a forming process following the buckling process
  • the invention is therefore based on the object of producing components from sheet metal with deliberately introduced, spatially limited stiffening areas which have a considerable increase in local stiffness compared to conventional components provided with local stiffening areas.
  • the invention is also based on the object of a simple method for achieving a to propose such a local increase in stiffness on sheet metal components
  • the surface of the component is then provided with a stiffening structure in selected areas, which consists of a periodic grid of nested concave and convex bumps Stiffness against torsion Furthermore, the regular periodic lattice structure of the stiffening pattern enables a mathematical simulation of the stiffnesses achieved and as a result of which a systematic optimization of the stiffening structure for the respective component
  • the stiffening structure can be characterized with the help of a few parameters (bulge radii and depths, lattice constant of the stiffening structure and orientation of the lattice direction with respect to the component), so that the parameters required for a certain local stiffness in advance of Component production can be determined by means of a simulation.
  • the depths of the bumps can be varied locally within the stiffening structure, as a result of which local variations in the stiffness can be achieved in a targeted manner within the stiffening area
  • a particularly simple to simulate stiffening structure which at the same time ensures high rigidity in all spatial directions, is a pattern of nested bumps on a hexagonal grid (see claim 2)
  • the stiffening structure is created with the help of a drawing process on the component (see claim 3)
  • a drawing process on the component (see claim 3)
  • the shaping of the component geometry and the introduction of the stiffening structure take place in a single operation, which essentially corresponds to a deep-drawing operation (see claim 4).
  • the stiffening structure which - depending on the required increase in stiffness - protrudes between 2 and 4 mm beyond the surrounding component area, is molded into the sheet metal part in the final pressure of the deep-drawing press.
  • the resulting high pressures result in an additional crystalline change in the sheet metal structure, which also contributes to increasing the rigidity of the sheet metal part the shaping of the component geometry, the local stiffening of any curved component surfaces
  • FIG. 1 shows a section of a side plate of an elongated beam with a local stiffness-increasing deformation structure
  • FIG. 4 shows a schematic illustration of a deep-drawing tool for producing a side plate for the long beam of FIG. 1
  • FIG. 1 shows a section of an elongated support 1 made of sheet steel, which forms part of a vehicle frame of a transporter.
  • the elongated support 1 consists of several individual parts 2 produced by means of a deep-drawing process and in particular comprises a side panel 2 ′ which is welded to other (not shown in FIG. 1) Individual parts of the long beam 1 are connected.
  • the long beam 1 must meet certain criteria in terms of both strength and rigidity, but at the same time should have the smallest possible sheet thickness in the interest of minimizing weight.
  • the individual parts 2, 2 'therefore consist of a high-strength steel, which - even with thin sheet thicknesses - has a comparatively high strength combined with good forming capacity.
  • the loss in stiffness of the long beam 1, which occurs due to the small sheet thickness is compensated for by local stiffness-increasing deformation structures 3, which are achieved using a deep-drawing process ahrens are stamped into selected areas of the individual parts 2
  • the long beam 1 which are exposed to particularly high compression and torsion loads in operation, in particular in the event of an accident.
  • this relates in particular to the central region 5, in which the long beam 1 is S-shaped and in which an attachment part 2 " is fastened, which serves to fasten a crossbeam (not shown in FIG. 1)
  • the main direction of loading lies along the longitudinal axes of the longbeam regions 6, which adjoin the central region 5. Due to the S structure, the central region 5 is below such loads are particularly susceptible to lateral buckling, which directly results in a displacement or use of the cross member
  • the side panel 2 ′ is provided in the central region 5 with a deformation structure that increases rigidity
  • the hexagonal structure 3 'used in this application consists of a hexagonal lattice of concave bulges 7, the bulges of which are provided with convex counterbumps 8, so that the structure 3', as shown in a sectional view in FIG. 2, consists of a nested concave lattice and convex bumps 7, 8 is formed.
  • the depth 9 of the bumps 7 and the height 10 of the counterbumps 8 vary over the central region 5, so that the depth 9 of the dents 7 and the height 10 of the counter dents 8 in the center 11 of the middle region 5 are greater than in the edge zones 12 of the middle region 5.
  • the local increase in rigidity which is brought about by the hexagonal structure 3 ′ in a selected region 4 depends on the depth 9 and the radius 14 of the bumps 7, the height 10 and the radius 15 of the counterbumps 8 and on the base length 16 of the hexagonal lattice, furthermore the local increase in stiffness is not isotropic, but depends on the orientation of the lattice relative to the direction of the force application, which is indicated by the arrows in the example of the long beam 1 in FIG. 1.
  • the stiffening structure 3 can in principle have any lattice structure and symmetry. However, in order to enable a fast and reliable simulation of the component rigidity achieved thereby (and thus an optimization of the component under loads), it is advantageous to choose a lattice that translates and has rotational symmetry and which can be characterized by a few parameters.
  • a lattice that translates and has rotational symmetry and which can be characterized by a few parameters.
  • square and triangular structures are particularly suitable for this. While hexagonal grids do not allow larger and smaller grid cells to interact, rectangular grid structures in particular can be used As shown in FIG. 3, lattice cells 17 of different sizes are combined, so that in this case an even more differentiated adaptation of the local stiffness of the areas concerned is possible
  • the individual parts 2, the rigidity of which are to be locally reinforced with the aid of deformation structures 3, are often parts of structural components and therefore have - depending on the function of the Component - sheet thicknesses of up to a few mm thick
  • a method must be used which exerts high deformation forces on the sheet metal.
  • FIG. 4 shows a basic sketch of a deep-drawing tool 1 9 for the production of the side plate 2 ′ of FIG. 1.
  • the deep-drawing tool 1 9 comprises a stamp 20 and a die 21, both of which are provided with local surface structures 22, 23, which are those on the raw plate 1 8
  • Deformation structure 3 'to be shaped When lowering the punch 20, first by the action of the edge areas 24, 24' on the punch 20 and die 21 on the raw sheet 18 flanges 25, 25 'are bent, to which additional sheets on the side part 2' in a later process step. When the plunger 20 is further lowered, the deformation structure 3 is then also produced on the raw sheet 18, this takes place in the final pressure of the deep-drawing plunger 20.
  • a suitable regulation of the pressure forces of the hold-down device 26 during the lowering of the plunger 20 ensures that during the molding both the flanges 25, 25 'and the deformation structure 3 have sufficient material s the side areas 27 of the raw sheet 1 8 can flow into the inner areas 28 to be formed and thus neither cracks nor folds of the raw sheet 1 8 occur in the area of the flanges 25, 25 'nor on the stiffness-increasing deformation structures 3
  • stamp or die areas 22, 23 which form the stiffness-increasing deformation structure 3 are exposed to higher wear than the rest of the tool during the deep-drawing process, depending on the geometry of the individual part 2 to be shaped, so it is advisable in some cases to use these areas 22 , 23 of the punch 20 or the die 21 can be reinforced by tool inserts 29, 30 made of a particularly hard or resistant material
  • the method according to the invention can be used for locally increasing the stiffness of plate-shaped workpieces 1 of different thicknesses, which can consist of a wide spectrum of different (deformable) materials.
  • the stiffness-increasing structures 3 can be used to reinforce any areas which are exposed to particular pressure and / or torsional loads With the aid of such a local deformation structure 3, specifically provide weak points in the component 1 at which the component kinks or breaks in the event of a certain load.
  • the grid cells 1 7 can also have a more complex convex-concave shape if, for example, each concave bump 7 is provided with a convex counterbump 8 on its inside, which in turn is a convex bump at its center having.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne une pièce en tôle très résistante, notamment une pièce de structure (1), présentant, dans une zone de renforcement localisée, une structure de déformation (3) qui augmente considérablement la rigidité locale de la pièce par rapport à des pièces classiques. Cette structure de déformation est constituée d'un réseau périodique de creux et de bosses (7, 8) intercalées. Elle est estampée au moyen d'un procédé d'emboutissage dans des zones déterminées et localisées de la tôle. Cette structure de la zone de renforcement, sous la forme d'un réseau périodique régulier, permet d'effectuer une simulation informatique des rigidités à obtenir et par conséquent d'obtenir une optimisation systématique de la structure de renforcement pour chaque pièce. Les profondeurs (9, 10) des creux et bosses peuvent varier localement à l'intérieur de la structure de renforcement, ce qui permet d'obtenir des variations locales ciblées de la rigidité de la pièce à l'intérieur de la zone de renforcement.
EP01913784A 2000-02-12 2001-02-03 Piece comportant des zones de renforcement localisees, et son procede de production Withdrawn EP1253983A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006348 2000-02-12
DE10006348A DE10006348C2 (de) 2000-02-12 2000-02-12 Bauteil mit lokal begrenzten Versteifungsbereichen und Verfahren zu seiner Herstellung
PCT/EP2001/001176 WO2001058615A1 (fr) 2000-02-12 2001-02-03 Piece comportant des zones de renforcement localisees, et son procede de production

Publications (1)

Publication Number Publication Date
EP1253983A1 true EP1253983A1 (fr) 2002-11-06

Family

ID=7630752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01913784A Withdrawn EP1253983A1 (fr) 2000-02-12 2001-02-03 Piece comportant des zones de renforcement localisees, et son procede de production

Country Status (4)

Country Link
US (1) US20030131646A1 (fr)
EP (1) EP1253983A1 (fr)
DE (1) DE10006348C2 (fr)
WO (1) WO2001058615A1 (fr)

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DE10215912C1 (de) 2002-04-11 2003-06-12 Daimler Chrysler Ag Verfahren und Prägewerkzeug zur Herstellung eines Karosserie-Bauteils aus einem wölbstrukturierten Blech
DE10339069A1 (de) * 2003-08-26 2005-03-24 Daimlerchrysler Ag Pressgehärtetes Bauteil mit einer Wölbstruktur
ATE417683T1 (de) * 2004-03-31 2009-01-15 Brummelte & Lienen Werkzeugbau Verfahren und vorrichtung zum blechformen und härten
DE102006055657A1 (de) * 2006-11-23 2008-05-29 Behrens, Arno, W. Dr.-Ing. Bauteil aus einem Flachmaterial und Verfahren zu seiner Herstellung
DE102007051565B4 (de) * 2007-10-29 2013-06-13 Webasto Ag Selbsttragendes flächenartiges Karosserieteil
US8317258B2 (en) * 2009-07-08 2012-11-27 Mazda Motor Corporation Frame structure for vehicle
DE102009057190A1 (de) * 2009-12-05 2013-04-11 Hans Kilian Fremmer Windenergie-Erzeuger mit sechseckig beulender Struktur
DE102010032098A1 (de) 2010-07-23 2012-01-26 Formtech Gmbh Verfahren zur Herstellung eines Werkstücks mit definierter Oberfläche
DE102010044788B4 (de) 2010-09-09 2019-04-11 Gottfried Wilhelm Leibniz Universität Hannover Umformwerkzeug und Verfahren zur Herstellung eines Tiefzieh-Blechbauteils
DE202010008532U1 (de) 2010-09-14 2011-12-16 Westfalia Presstechnik Gmbh & Co. Kg Bauteil für die Innenausstattung eines Fahrzeuges
WO2012125804A2 (fr) * 2011-03-15 2012-09-20 Pridgeon & Clay, Inc. Procédé et appareil pour fabriquer une électrode de pile à combustible
CN102873155A (zh) * 2012-09-26 2013-01-16 无锡市恒达矿山机械有限公司 一种钢带压模机压板结构
DE102014112858A1 (de) * 2013-09-06 2015-03-12 Westfalia Presstechnik Gmbh & Co. Kg Flächenelement, insbesondere für ein Kraftfahrzeug
CN103433344A (zh) * 2013-09-10 2013-12-11 吴江涵辉纺织有限公司 散热薄板冲窝机
CN109863077B (zh) * 2016-10-24 2022-01-07 本田技研工业株式会社 汽车用底板及汽车用底板的制造方法
FR3078003B1 (fr) * 2018-02-20 2021-01-15 Psa Automobiles Sa Piece de structure soudee par des points de soudure a une autre piece de structure et comportant le long de la soudure des parties a rigidite variable
DE102020128667A1 (de) * 2020-10-30 2022-05-05 Indikar Individual Karosseriebau Gmbh Schutzplatte

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Also Published As

Publication number Publication date
DE10006348A1 (de) 2001-09-06
DE10006348C2 (de) 2001-12-06
WO2001058615A1 (fr) 2001-08-16
US20030131646A1 (en) 2003-07-17

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