EP0857526A1 - Blank for plastic deformation, at least part of which is double-skinned - Google Patents

Blank for plastic deformation, at least part of which is double-skinned Download PDF

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Publication number
EP0857526A1
EP0857526A1 EP97121826A EP97121826A EP0857526A1 EP 0857526 A1 EP0857526 A1 EP 0857526A1 EP 97121826 A EP97121826 A EP 97121826A EP 97121826 A EP97121826 A EP 97121826A EP 0857526 A1 EP0857526 A1 EP 0857526A1
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EP
European Patent Office
Prior art keywords
formed part
part according
projections
strength
thickness
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.)
Granted
Application number
EP97121826A
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German (de)
French (fr)
Other versions
EP0857526B1 (en
Inventor
Jürgen Dr. Hillmann
Klaus-Dieter Morsch
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Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
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Publication of EP0857526A1 publication Critical patent/EP0857526A1/en
Application granted granted Critical
Publication of EP0857526B1 publication Critical patent/EP0857526B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • 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
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/006—Blanks having varying thickness, e.g. tailored blanks
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12229—Intermediate article [e.g., blank, etc.]
    • Y10T428/12264—Intermediate article [e.g., blank, etc.] having outward flange, gripping means or interlocking feature
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12347—Plural layers discontinuously bonded [e.g., spot-weld, mechanical fastener, etc.]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]

Definitions

  • the invention relates to a shaped part with a multiple sheet metal structure, in particular double sheet structure, according to the preamble of claim 1, in particular for a vehicle or a vehicle body that undergoes a forming process, for example is subjected to a deep-drawing, bending or stamping process.
  • Sheet metal structural part in its thickness according to the area with the highest mechanical loads known, local areas of such a sheet metal structural part, e.g. For Hinge and spring strut mounts, for stops for doors and flaps, attachment areas for bars or other load-bearing elements, in their thickness corresponding to that in use of the formed part occurring, largely predictable load to adjust to avoid unnecessary material expenditure and to achieve a weight reduction.
  • This also makes it possible to determine the initial thickness of such a sheet metal structural part Use a thinner base plate. Larger sheet thicknesses go hand in hand a greater sheet strength, in particular torsional rigidity, bending strength and also greater compressive and tensile strength.
  • DE 43 07 563 A1 includes a deep-drawn or die-cut sheet metal structural part a partial double sheet structural part and a manufacturing method for this described.
  • This sheet metal structural part is multilayered from a base sheet and in certain areas formed on this arranged reinforcement plates.
  • the making of this Sheet metal structural part takes place in such a way that the reinforcing sheets before the common Forming is at least partially attached to the base plate and after forming finally be inextricably linked to it.
  • the sheet metal structural part described also refers to a so-called multiple sheet structure, in which a base sheet a first reinforcing plate and on it in a likewise predetermined area additional reinforcement plate are arranged. The arrangement is also in areas several additional reinforcement plates on the first reinforcement plate possible.
  • a such a multiple sheet metal structure can also be formed as a unit.
  • a Multiple sheet metal structure it is now possible to largely the thickness of the sheet metal structural part adjust the load profile of the formed part and the spatial expansion of the To keep reinforcement plates to a minimum and to reinforce them just there, where this is absolutely necessary.
  • Materials or different material qualities combine, for example a higher strength than the base plate Reinforcing plate having at more relevant areas or in the area of To use force introduction points, so with regard to the mechanical Requirements, but also in terms of optics and costs to an optimal Result.
  • the production of a Multiple sheet metal structure is complex and the forming process can be problematic, as ever at least three sheets lying one above the other and only partially attached to one another must be reshaped together.
  • This task is performed in a generic shaped part with the features of the characteristic Part of claim 1 solved.
  • On a base plate are in the more heavily loaded Areas of reinforcing plates are arranged, in accordance with the predeterminable Load on the formed and used formed part and form-fitting adjacent to each other, so that a structure in the manner of a patchwork (patchwork technique) is present.
  • the thickness, the bending strength and the membrane strength are and the number of reinforcement plates depending on the load structure differently. The more differentiated this is in a certain area, the more the form-fittingly arranged are smaller and different in thickness To design reinforcement plates.
  • the mutually facing edges of the same are in hers Profiled top view and essentially provided with regularly arranged projections, with which the reinforcement plates are mutually engaged.
  • the shaped part according to the invention is adaptable to the given load structure.
  • the thickness of the base plate can also depend on this load structure. be minimized.
  • the sheet metal structural part to be formed can thus be reduced Material use are produced, which ultimately goes hand in hand with a weight reduction.
  • the reinforcing plates can be fastened at their edges to the base plate, for example by one generated with a high-energy beam, in particular a laser beam Weld seam as a continuous edge seam, with which the one another in an advantageous manner reinforcing sheets engaged by a single seam with the base sheet can be connected.
  • a high-energy beam in particular a laser beam Weld seam as a continuous edge seam, with which the one another in an advantageous manner reinforcing sheets engaged by a single seam with the base sheet can be connected.
  • the projections can be provided with rounded or straight flanks. They should preferably interlock positively in any design, so no step-like Changes in thickness or strength occur.
  • the reinforcement plates can advantageously be made of different materials with different Strength exist in order to reduce differences in thickness or to reduce them at all remove.
  • 1, 2 and 2a is a formed part with one from a base plate 1 and two this arranged reinforcement plates 2 and 3 made of a material with the same strength properties (Sheet steel) shown.
  • the respective thickness of the two reinforcement plates 2 and 3 is predetermined depending on the load structure of the formed part and different, as can be seen from Fig. 2.
  • the two reinforcement plates 2 and 3 are profiled in the same way as a saw blade on the facing edges, the formed tooth-like projections 4 and 5 have straight flanks and interlocking are mutually engaged.
  • the reinforcement plates 2 and 3 on the base plate Weld points 6 attached From Figs.
  • an area B is formed in which the Strength, in particular the material thickness determining the bending strength along the straight line C decreases continuously from edge D to edge E (FIG. 2a).
  • the area B in which the base sheet 1 intersects plane A, is the effective one Material thickness difference of the reinforcement plates halved.
  • 3 and 4 is a formed part with a base plate 7 and three on this arranged reinforcement plates 8, 9 and 10 made of a material with the same strength properties and, depending on the load structure of the formed part, with different Thickness shown.
  • the mutually facing edges of the reinforcement plates 8 and 9, 9 and 10 are corrugated, so that the projections 11 and 12 and 13 and 14 have rounded flanks and are mutually engaged with them. It can the formation of the projections 13 and 14 compared to the formation of the projections 11 and 12 be different.
  • the reinforcement plates 8, 9 and 10 are each by an uninterrupted Laser weld seam along the respective contact line and the outer one Edges connected to the base plate 7.
  • Fig. 4 is the curve line F in each case Change in the thickness and thus the strength of the sheet metal structure or the formed part indicated between the respective reinforcement plates 8 and 9 and 9 and 10. It is in In contrast to the embodiment of FIGS. 1 and 2 not linear.
  • FIG. 5 shows a shaped part in which three reinforcement plates are located on a base plate 11 12, 13 and 14 of different strength properties are attached, the load structure of the formed part of the embodiment shown in FIG. 4 corresponds.
  • the middle reinforcing plate 13 has a higher material strength than that two other reinforcement plates 12 and 14, and the reinforcement plate 12 one higher material strength than the reinforcement plate 14.
  • the reinforcement plates 12 and 13 are consequently thinner and stronger than the reinforcement plates 8 and 9 according to FIG. 4 have the same thickness as the adjacent reinforcing plate 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Laser Beam Processing (AREA)
  • Laminated Bodies (AREA)

Abstract

The thickness or strength of the reinforcing layers (2,3) fastened to the base layer varies in dependence upon the predetermined load structure of the component. The reinforcing layers are located to interlock with each other in a form-fit manner, in sections at least. The relatively facing edges of the reinforcing layers are profiled and have protrusions (4,5) which reciprocally engage in toothed and/or overlapping form.

Description

Die Erfindung betrifft ein Umformteil mit einer bereichsweise ausgebildeten Mehrfachblechstruktur, insbesondere Doppelblechstruktur, nach dem Oberbegriff des Anspruchs 1, insbesondere für ein Fahrzeug oder eine Fahrzeugkarosserie, das einem Umformprozeß, beispielsweise einem Tiefzieh-, Abkant- oder Formstanzprozeß unterzogen wird.The invention relates to a shaped part with a multiple sheet metal structure, in particular double sheet structure, according to the preamble of claim 1, in particular for a vehicle or a vehicle body that undergoes a forming process, for example is subjected to a deep-drawing, bending or stamping process.

Es ist neben der durchaus noch üblichen Praxis, ein für eine Umformung vorgesehenes Blechstrukturteil in seiner Dicke nach dem Bereich mit den höchsten mechanischen Belastungen auszulegen, bekannt, lokale Bereiche eines solchen Blechstrukturteiles, z.B. für Scharnier- und Federbeinaufnahmen, für Anschläge für Türen und Klappen, Ansatzbereiche für Holme oder sonstige tragende Elemente, in ihrer Dicke entsprechend der beim Einsatz des Umformteiles auftretenden, weitgehend vorbestimmbaren Belastung anzupassen, um einen unnötigen Materialaufwand zu vermeiden und eine Gewichtsreduzierung zu erzielen. Dadurch ist es auch möglich, die Ausgangsdicke eines derartigen Blechstrukturteiles durch Einsatz eines dünneren Basisbleches zu senken. Größere Blechdicken gehen einher mit einer größeren Blechfestigkeit, insbesondere Verwindungssteifgkeit, Biegefestigkeit und auch einer größeren Druck- und Zugfestigkeit.In addition to the still common practice, it is one that is intended for forming Sheet metal structural part in its thickness according to the area with the highest mechanical loads known, local areas of such a sheet metal structural part, e.g. For Hinge and spring strut mounts, for stops for doors and flaps, attachment areas for bars or other load-bearing elements, in their thickness corresponding to that in use of the formed part occurring, largely predictable load to adjust to avoid unnecessary material expenditure and to achieve a weight reduction. This also makes it possible to determine the initial thickness of such a sheet metal structural part Use a thinner base plate. Larger sheet thicknesses go hand in hand a greater sheet strength, in particular torsional rigidity, bending strength and also greater compressive and tensile strength.

Bei den bekannten tailored blanks sind dazu Blechstreifen unterschiedlichen Dicke zusammengefügt, beispielsweise ein zwischen dickeren Blechstreifen angeordneter dünnerer Blechstreifen, um anschließend gemeinsam umgeformt zu werden. Hinsichtlich der Anpassung der Materialdicke an das jeweilige Belastungsprofil des in das Fahrzeug eingesetzten Umformteiles sind bei Verwendung dieser tailored blanks Grenzen gesetzt, d.h. das Umformteil ist auch noch in Bereichen verstärkt, in denen es nicht verstärkt sein müßte. Damit sind bei einem Einsatz von tailored blanks auch einer Gewichtreduzierung Grenzen gesetzt. In the known tailored blanks, sheet metal strips of different thickness are joined together, for example, a thinner one arranged between thicker metal strips Sheet metal strips to be subsequently formed together. In terms of customization the material thickness to the respective load profile of that used in the vehicle Formed parts are limited when using these tailored blanks, i.e. the Formed part is also reinforced in areas where it would not have to be reinforced. There are limits to weight reduction when using tailored blanks set.

In der DE 43 07 563 A1 sind ein tiefgezogenes oder formgestanztes Blechstrukturteil mit einer partiellen Doppelblechstrukturteil und ein Herstellungsverfahren für dieses beschrieben. Dieses Blechstrukturteil ist mehrschichtig aus einem Grundblech und bereichsweise auf diesem angeordneten Verstärkungsblechen gebildet. Die Herstellung dieses Blechstrukturteiles erfolgt derart, daß die Verstärkungsbleche vor dem gemeinsamen Umformen zumindest teilweise am Grundblech befestigt und nach dem Umformen abschließend unlösbar mit diesem verbunden werden. Das beschriebene Blechstrukturteil bezieht sich auch auf eine sogenannte Mehrfachblechstruktur, bei der auf ein Grundblech ein erstes Verstärkungsblech und auf diesem in einem ebenfalls vorbestimmten Bereich ein weiteres Verstärkungsblech angeordnet sind. Auch ist die bereichsweise Anordnung mehrerer weiterer Verstärkungsbleche auf dem ersten Verstärkungsblech möglich. Eine solche Mehrfachblechstruktur kann ebenfalls als Einheit umgeformt werden. Mit einer Mehrfachblechstrukur ist es nun möglich, das Blechstrukturteil in seiner Dicke weitgehend dem Belastungsprofil des Umformteiles anzupassen und die räumliche Ausdehnung der Verstärkungsbleche auf ein Minimum zu begrenzen und eben nur genau dort zu verstärken, wo dieses auch unbedingt notwendig ist. Grundsätzlich ist es dabei auch möglich, unterschiedliche Werkstoffe oder unterschiedliche Werkstoffqualitäten miteinander zu kombinieren, beispielsweise ein eine gegenüber dem Grundblech höhere Festigkeit aufweisendes Verstärkungsblech an stärkerelevanten Bereichen oder im Bereich von Krafteinleitungspunkten einzusetzen, um so im Hinblick auf die mechanischen Anforderungen, aber auch im Hinblick auf Optik und Kosten jeweils zu einem optimalen Ergebnis zu gelangen. Verfahrenstechnisch jedoch ist die Herstellung einer Mehrfachblechstruktur aufwendig und der Umformprozeß kann problematisch sein, da je wenigstens drei übereinanderliegende und nur teilweise aneinander befestigte Bleche gemeinsam umgeformt werden müssen.DE 43 07 563 A1 includes a deep-drawn or die-cut sheet metal structural part a partial double sheet structural part and a manufacturing method for this described. This sheet metal structural part is multilayered from a base sheet and in certain areas formed on this arranged reinforcement plates. The making of this Sheet metal structural part takes place in such a way that the reinforcing sheets before the common Forming is at least partially attached to the base plate and after forming finally be inextricably linked to it. The sheet metal structural part described also refers to a so-called multiple sheet structure, in which a base sheet a first reinforcing plate and on it in a likewise predetermined area additional reinforcement plate are arranged. The arrangement is also in areas several additional reinforcement plates on the first reinforcement plate possible. A such a multiple sheet metal structure can also be formed as a unit. With a Multiple sheet metal structure, it is now possible to largely the thickness of the sheet metal structural part adjust the load profile of the formed part and the spatial expansion of the To keep reinforcement plates to a minimum and to reinforce them just there, where this is absolutely necessary. Basically, it is also possible to use different ones Materials or different material qualities combine, for example a higher strength than the base plate Reinforcing plate having at more relevant areas or in the area of To use force introduction points, so with regard to the mechanical Requirements, but also in terms of optics and costs to an optimal Result. Technically, however, is the production of a Multiple sheet metal structure is complex and the forming process can be problematic, as ever at least three sheets lying one above the other and only partially attached to one another must be reshaped together.

Es ist Aufgabe der Erfindung, ein Umformteil mit einer bereichsweise ausgebildeten Mehrfachblechstruktur nach dem Oberbegriff des Anspruchs 1 zu schaffen, das in seinem Dickenprofil und Festigkeitsprofil weitgehend dem bei seinem bestimmungsgemäßen Einsatz gegebenen Belastungsprofil angepaßt ist und bei dem der Erstellungsaufwand reduziert ist.It is an object of the invention to provide a shaped part with a multiple sheet metal structure which is formed in some areas according to the preamble of claim 1, which in his Thickness profile and strength profile largely that when used as intended given load profile is adapted and in which the preparation effort is reduced.

Diese Aufgabe wird bei einem gattungsgemäßen Umformteil mit den Merkmalen des kennzeichnenden Teils des Anspruchs 1 gelöst. Auf einem Basisblech sind in den stärker belasteten Bereichen Verstärkungsbleche angeordnet, und zwar entsprechend der vorbestimmbaren Belastung des umgeformten und eingesetzten Umformteiles und formschlüssig aneinander angrenzend, so daß ein Gebilde in der Art eines Flickenteppichs (patchwork-Technik) vorliegt. Erfindungsgemäß sind dabei die Dicke, die Biege- und die Membranfestigkeit und die Anzahl der Verstärkungsbleche in Abhängigkeit von der Belastungsstruktur unterschiedlich. Je differenzierter diese in einem bestimmten Bereich ist, desto kleiner und in der Dicke unterschiedlicher sind die formschlüssig aneinander angeordneten Verstärkungsbleche zu gestalten. Die einander zugewandten Ränder derselben sind in ihrer Draufsicht profiliert und im wesentlichen mit regelmäßig angeordneten Vorsprüngen versehen, mit denen die Verstärkungsbleche gegenseitig in Eingriff stehen. Durch diese Profilierung und die in den Randbereichen gegebene gegenseitige Durchdringung unterschiedlich dicker oder unterschiedlich fester Bleche wird ein gemäßigter Übergang von einer effektiven Blechdicke auf eine andere bzw. von einer Festigkeit auf eine andere geschaffen, so daß beispielsweise die durch ein aufgebrachtes Biegemoment gegebene Biegebeanspruchung des Umformteiles in Abhängigkeit von der Dicke bzw. der Festigkeit der beiden Bleche und die Gestaltung der Profilierung im gegenseitigen Eingriffsbereich der Verstärkungsbleche linear oder nichtlinear gemäßigt verändert wird.This task is performed in a generic shaped part with the features of the characteristic Part of claim 1 solved. On a base plate are in the more heavily loaded Areas of reinforcing plates are arranged, in accordance with the predeterminable Load on the formed and used formed part and form-fitting adjacent to each other, so that a structure in the manner of a patchwork (patchwork technique) is present. According to the invention, the thickness, the bending strength and the membrane strength are and the number of reinforcement plates depending on the load structure differently. The more differentiated this is in a certain area, the more the form-fittingly arranged are smaller and different in thickness To design reinforcement plates. The mutually facing edges of the same are in hers Profiled top view and essentially provided with regularly arranged projections, with which the reinforcement plates are mutually engaged. Through this profiling and the mutual penetration given in the peripheral areas varies thicker or differently strong sheets become a moderate transition from an effective one Sheet thickness to another or created from one strength to another, so that for example the bending stress given by an applied bending moment of the formed part depending on the thickness or strength of the two sheets and the design of the profiling in the mutual area of engagement of the reinforcement plates is changed linearly or non-linearly moderately.

Das erfindungsgemäße Umformteil ist an die gegebene Belastungsstruktur anpaßbar. Die Dicke des Basisbleches kann, ebenfalls in Abhängigkeit von dieser Belastungsstruktur, minimiert werden. Das umzuformende Blechstrukturteil kann somit mit einem reduzierten Materialeinsatz hergestellt werden, was letztlich mit einer Gewichtsreduzierung einhergeht.The shaped part according to the invention is adaptable to the given load structure. The The thickness of the base plate can also depend on this load structure. be minimized. The sheet metal structural part to be formed can thus be reduced Material use are produced, which ultimately goes hand in hand with a weight reduction.

Die Verstärkungsbleche können an ihren Rändern am Basisblech befestigt sein, beispielsweise durch eine mit einem hochenergetischen Strahl, insbesondere Laserstrahl erzeugte Schweißnaht als ununterbrochene Randnaht, mit der in vorteilhafter Weise die miteinander in Eingriff stehenden Verstärkungsbleche durch eine einzige Naht mit dem Basisblech verbunden werden können.The reinforcing plates can be fastened at their edges to the base plate, for example by one generated with a high-energy beam, in particular a laser beam Weld seam as a continuous edge seam, with which the one another in an advantageous manner reinforcing sheets engaged by a single seam with the base sheet can be connected.

Ebenso ist es vorteilhaft, die Profilvorsprünge der Verstärungebleche durch jeweils einen Schweißpunkt am Basisblech zu befestigen. Als weitere Befestigungsmethoden können selbstverständlich alle anderen zur Verfügung stehenden Fügeverfahren zur Anwendung kommen, wie das Durchsetzfügen (Clinchen), das Stanznieten oder auch ein Kleben, wobei die Anwendung des jeweiligen Fügeverfahrens auch vom Einsatzort des Umformteiles am Kraftfahrzeug und einem dadurch erforderlichen optischen Erscheinungsbild abhängig sein kann.It is also advantageous to use one profile each for the profile projections of the reinforcement plates Fasten the welding spot to the base plate. As other attachment methods you can of course, all other joining methods available for use come, such as clinching, punch riveting or gluing, whereby the application of the respective joining process also from the place of use of the formed part on Motor vehicle and an optical appearance required thereby can.

Die Vorsprünge können mit gerundeten oder geraden Flanken versehen sein. Sie sollten bevorzugt in jeder Gestaltungsform formschlüssig ineinandergreifen, damit keine stufenförmigen Dicken- oder Festigkeitsveränderungen auftreten.The projections can be provided with rounded or straight flanks. they should preferably interlock positively in any design, so no step-like Changes in thickness or strength occur.

Die Verstärkungsbleche können vorteilhaft aus unterschiedlichen Materialien mit unterschiedlicher Festigkeit bestehen, um Dickenunterschiede zu reduzieren oder überhaupt zu beseitigen.The reinforcement plates can advantageously be made of different materials with different Strength exist in order to reduce differences in thickness or to reduce them at all remove.

Es kann überdies zweckmäßig sein, die miteinander zu verbindenden Bleche verbindungsseitig jeweils mit einer Korrosionsschutzschicht zu versehen.It may also be expedient to connect the sheets to be joined together on the connection side each with an anti-corrosion layer.

Die Erfindung wird nachstehend an einem Ausführungsbeispiel erläutert. In der zugehörigen Zeichnung zeigen schematisch:

Fig. 1:
ein erfindungsgemäßes Umformteil mit einer Doppelblechstruktur in Draufsicht,
Fig. 2:
einen Schnitt II-II durch dieses Umformteil,
Fig. 2a:
die Einzelheit E aus diesem Schnitt,
Fig. 3:
eine andere Ausführung eines erfindungsgemäßen Umformteiles in Draufsicht,
Fig. 4:
einen Schnitt IV-IV durch dieses Umformteil und
Fig. 5:
eine Seitenansicht einer weiteren Ausführung eines erfindungsgemäßen Umformteiles.
The invention is explained below using an exemplary embodiment. The accompanying drawing shows schematically:
Fig. 1:
a shaped part according to the invention with a double sheet structure in plan view,
Fig. 2:
a section II-II through this shaped part,
Fig. 2a:
the detail E from this cut,
Fig. 3:
another embodiment of a shaped part according to the invention in plan view,
Fig. 4:
a section IV-IV through this shaped part and
Fig. 5:
a side view of another embodiment of a molded part according to the invention.

In den Fig. 1, 2 und 2a ist ein Umformteil mit einer aus einem Basisblech 1 und zwei auf diesem angeordneten Verstärkungsblechen 2 und 3 aus einem Material gleicher Festigkeitseigenschaften (Stahlblech) dargestellt. Die jeweilige Dicke der beiden Verstärkungsbleche 2 und 3 ist in Abhängigkeit von der Belastungsstruktur des Umformteiles vorbestimmt und unterschiedlich, wie aus Fig. 2 zu erkennen ist. Die beiden Verstärkungsbleche 2 und 3 sind an den einander zugewandten Ränder in gleicher Weise sägeblattartig profiliert, wobei die gebildeten zahnartigen Vorsprünge 4 und 5 gerade Flanken aufweisen und verzahnend gegenseitig in Eingriff stehen. In dieser formschlüssigen und hier zumindest teilweise auch überlappenden Anordnung sind die Verstärkungsbleche 2 und 3 am Basisblech mit Schweißpunkten 6 befestigt. Aus den Fig. 2 und 2a ist zu erkennen, daß durch diesen gegenseitigen Eingriff der Vorsprünge 4 und 5 ein Bereich B gebildet ist, in dem die die Festigkeit, insbesondere die die Biegefestigkeit bestimmende Materialdicke entlang der geraden Linie C von der Kante D zur Kante E (Fig. 2a) kontinuierlich abnimmt. In der Mitte des Bereiches B, in der das Basisblech 1 senkrecht schneidenden Ebene A, ist der effektive Materialdickenunterschied der Verstärkungsbleche halbiert. Durch die effektive Materialdickenveränderung gemäß der Linie C und der damit verbundenen Festigkeitsveränderung wird ein auf das Umformteil aufgebrachtes Biegemoment im Bereich B ebenfalls entsprechend dem Verlauf der Linie C von der Kante D zur Kante E im belasteten Umformteil umgesetzt.1, 2 and 2a is a formed part with one from a base plate 1 and two this arranged reinforcement plates 2 and 3 made of a material with the same strength properties (Sheet steel) shown. The respective thickness of the two reinforcement plates 2 and 3 is predetermined depending on the load structure of the formed part and different, as can be seen from Fig. 2. The two reinforcement plates 2 and 3 are profiled in the same way as a saw blade on the facing edges, the formed tooth-like projections 4 and 5 have straight flanks and interlocking are mutually engaged. In this form-fitting and here at least partly also overlapping arrangement are the reinforcement plates 2 and 3 on the base plate Weld points 6 attached. From Figs. 2 and 2a it can be seen that this mutual engagement of the projections 4 and 5, an area B is formed in which the Strength, in particular the material thickness determining the bending strength along the straight line C decreases continuously from edge D to edge E (FIG. 2a). In the middle the area B, in which the base sheet 1 intersects plane A, is the effective one Material thickness difference of the reinforcement plates halved. Through the effective change in material thickness according to line C and the associated change in strength a bending moment applied to the formed part in region B is also corresponding the course of line C from edge D to edge E in the loaded forming part implemented.

In den Fig. 3 und 4 ist ein Umformteil mit einer aus einem Basisblech 7 und drei auf diesem angeordneten Verstärkungsblechen 8, 9 und 10 aus einem Material gleicher Festigkeitseigenschaften und, in Abhängigkeit von der Belastungsstruktur des Umformteils, mit unterschiedlicher Dicke dargestellt. Die einander zugewandten Ränder der Verstärkungsbleche 8 und 9 , 9 und 10 sind wellenförmig profiliert, so daß die Vorsprünge 11 und 12 bzw. 13 und 14 gerundete Flanken aufweisen und mit diesen gegenseitig in Eingriff stehen. Dabei kann die Ausbildung der Vorsprünge 13 und 14 gegenüber der Ausbildung der Vorsprünge 11 und 12 unterschiedlich sein. Die Verstärkungsbleche 8, 9 und 10 sind durch jeweils eine ununterbrochene Laserschweißnaht entlang der jeweiligen Berührungslinie und der äußeren Ränder mit dem Basisblech 7 verbunden. In Fig. 4 ist durch die Kurvenlinie F jeweils die Veränderung der Dicke und damit der Festigkeit der Blechstruktur bzw. des Umformteils zwischen den jeweiligen Verstärkungsblechen 8 und 9 und 9 und 10 angedeutet. Sie ist im Gegensatz zum Ausführungsbeispiel nach den Fig. 1 und 2 nicht linear.3 and 4 is a formed part with a base plate 7 and three on this arranged reinforcement plates 8, 9 and 10 made of a material with the same strength properties and, depending on the load structure of the formed part, with different Thickness shown. The mutually facing edges of the reinforcement plates 8 and 9, 9 and 10 are corrugated, so that the projections 11 and 12 and 13 and 14 have rounded flanks and are mutually engaged with them. It can the formation of the projections 13 and 14 compared to the formation of the projections 11 and 12 be different. The reinforcement plates 8, 9 and 10 are each by an uninterrupted Laser weld seam along the respective contact line and the outer one Edges connected to the base plate 7. In Fig. 4 is the curve line F in each case Change in the thickness and thus the strength of the sheet metal structure or the formed part indicated between the respective reinforcement plates 8 and 9 and 9 and 10. It is in In contrast to the embodiment of FIGS. 1 and 2 not linear.

In Fig. 5 schließlich ist ein Umformteil dargestellt, in dem auf einem Basisblech 11 drei Verstärkungsbleche 12, 13 und 14 unterschiedlicher Festigkeitseigenschaften befestigt sind, wobei die Belastungsstruktur des Umformteils der beim Ausführungsbeispiel gemäß Fig. 4 entspricht. Das mittlere Verstärkungsblech 13 weist eine höhere Materialfestigkeit als die beiden anderen Verstärkungsbleche 12 und 14 auf, und das Verstärkungsblech 12 eine höhere Materialfestigkeit als das Verstärkungsblech 14. Die Verstärkungsbleche 12 und 13 sind gegenüber den Verstärkungsblechen 8 und 9 gemäß Fig. 4 demzufolge dünner und weisen die gleiche Dicke wie das benachbarte Verstärkungsblech 14 auf.Finally, FIG. 5 shows a shaped part in which three reinforcement plates are located on a base plate 11 12, 13 and 14 of different strength properties are attached, the load structure of the formed part of the embodiment shown in FIG. 4 corresponds. The middle reinforcing plate 13 has a higher material strength than that two other reinforcement plates 12 and 14, and the reinforcement plate 12 one higher material strength than the reinforcement plate 14. The reinforcement plates 12 and 13 are consequently thinner and stronger than the reinforcement plates 8 and 9 according to FIG. 4 have the same thickness as the adjacent reinforcing plate 14.

Claims (8)

Umformteil mit einer bereichsweise ausgebildeten Mehrfachblechstruktur, gebildet aus einem Basisblech und mehreren auf diesem befestigten Verstärkungsblechen, dadurch gekennzeichnet, daß die Dicke oder die Festigkeit der Verstärkungsbleche (2, 3; 8, 9, 10; 12, 13, 14) in Abhängigkeit von der vorbestimmbaren Belastungsstruktur des Umformteiles unterschiedlich ist, und daß die Verstärkungsbleche (2, 3; 8, 9; 9, 10; 12, 13; 13, 14) formschlüssig zumindest abschnittsweise zum gegenseitigen Eingriff aneinander angeordnet sind.Formed part with a regionally formed multiple sheet metal structure, formed from a base sheet and several reinforcing sheets attached to it, characterized in that the thickness or the strength of the reinforcing sheets (2, 3; 8, 9, 10; 12, 13, 14) depending on the Predeterminable loading structure of the shaped part is different, and that the reinforcing plates (2, 3; 8, 9; 9, 10; 12, 13; 13, 14) are arranged in a form-fitting manner, at least in sections, for mutual engagement with one another. Umformteil nach Anspruch 1, dadurch gekennzeichnet, daß die einander zugewandten Ränder der Verstärkungsbleche profiliert und im wesentlichen mit Vorsprüngen (4, 5; 11, 12; 13, 14) versehen sind, die verzahnend und/oder überlappend gegenseitig in Eingriff stehen.Formed part according to claim 1, characterized in that the mutually facing edges of the reinforcing plates are profiled and are essentially provided with projections (4, 5; 11, 12; 13, 14) which mesh with one another in a toothed and / or overlapping manner. Umformteil nach Anspruch 1, dadurch gekennzeichnet, daß die Verstärkungsbleche (8, 9, 10; 12, 13, 14) an ihren Rändern am Basisblech (7; 11) befestigt sind, insbesondere durch Schweißen mit einem hochenergetischen Strahl.Formed part according to claim 1, characterized in that the reinforcing plates (8, 9, 10; 12, 13, 14) are fastened at their edges to the base plate (7; 11), in particular by welding with a high-energy beam. Umformteil nach Anspruch 1, dadurch gekennzeichnet, daß die Verstärkungsbleche (2, 3) mit ihren Vorsprüngen (4, 5) am Basisblech (1) befestigt sind.Formed part according to claim 1, characterized in that the reinforcing plates (2, 3) are attached to the base plate (1) with their projections (4, 5). Umformteil nach Anspruch 1, dadurch gekennzeichnet, daß die Vorsprünge (11, 12) gerundete Flanken aufweisen.Formed part according to claim 1, characterized in that the projections (11, 12) have rounded flanks. Umformteil nach Anspruch 1, dadurch gekennzeichnet, daß die Vorsprünge (4, 5) gerade Flanken aufweisen. Formed part according to claim 1, characterized in that the projections (4, 5) have straight flanks. Umformteil nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Verstärkungsbleche (12, 13, 14) aus Materialien unterschiedlicher Biege- und Membranfestigkeit bestehen.Formed part according to claim 1, 2 or 3, characterized in that the reinforcing plates (12, 13, 14) consist of materials of different bending and membrane strength. Umformteil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die miteinander zu verbindenden Bleche (1 und 2, 3; 7 und 8, 9, 10; 11 und 12, 13, 14) an den einander zugewandten Flächen jeweils mit einer Korrosionsschutzschicht versehen sind.Formed part according to one of the preceding claims, characterized in that the sheets (1 and 2, 3; 7 and 8, 9, 10; 11 and 12, 13, 14) to be joined together are each provided with a corrosion protection layer on the mutually facing surfaces .
EP97121826A 1997-02-08 1997-12-11 Blank for plastic deformation, at least part of which is double-skinned Expired - Lifetime EP0857526B1 (en)

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DE59700614D1 (en) 1999-12-02
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JPH10296360A (en) 1998-11-10
CN1191781A (en) 1998-09-02
KR19980070687A (en) 1998-10-26

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