EP1062397B1 - Double sheet metal consisting of two covering metal sheets and an intermediate layer - Google Patents

Double sheet metal consisting of two covering metal sheets and an intermediate layer Download PDF

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Publication number
EP1062397B1
EP1062397B1 EP99915552A EP99915552A EP1062397B1 EP 1062397 B1 EP1062397 B1 EP 1062397B1 EP 99915552 A EP99915552 A EP 99915552A EP 99915552 A EP99915552 A EP 99915552A EP 1062397 B1 EP1062397 B1 EP 1062397B1
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EP
European Patent Office
Prior art keywords
double
layered sheet
sheet according
fill material
plastic
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.)
Expired - Lifetime
Application number
EP99915552A
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German (de)
French (fr)
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EP1062397A1 (en
Inventor
Friedrich Behr
Klaus Blümel
Horst MITTELSTÄDT
Cetin Nazikkol
Werner Hufenbach
Frank Adam
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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Publication of EP1062397A1 publication Critical patent/EP1062397A1/en
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Publication of EP1062397B1 publication Critical patent/EP1062397B1/en
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Classifications

    • 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
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/292—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and sheet metal
    • 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
    • E04C2/326—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 corrugations, incisions or reliefs in more than one direction of the element
    • 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
    • Y10T428/12389—All metal or with adjacent metals having variation in thickness
    • 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
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12556—Organic component
    • Y10T428/12569—Synthetic resin

Definitions

  • the invention relates to a double-layer sheet made of two a space between the cover plates that form, at least one cover plate as a knobbed plate trained and at the tips of his nubs with the other Cover plate is welded or soldered, and from one filling material filling the space from at least two different types of fabric.
  • Double-layer sheets of this type are available in different Versions known (DE 195 03 166 A1; DE 196 06 981 A1; US-A 4,559,274; Stahl und Eisen 117 (1997), No. 10, page 46).
  • Double-layer sheets are mainly used in Vehicle construction because of its high rigidity at relatively light weight and still in certain limits can be formed, especially deep-drawing, are.
  • the characteristic thickness of the cover plates lies less than 1 mm, especially less than 0.5 mm, and that of Filling material between 1 and 5 mm.
  • Filling material are different in the known double-layer sheets Materials, for example perforated mats, in particular made of plastic or cellulose, or perforated Aluminum sheets, inserted. With perforated mats or Aluminum sheets grip the knobs of the knobbed sheet through the holes in the mat.
  • a double-layer sheet is known (US-A 4,559,274), whose cover plates are designed as double plates and on the Studs are welded together.
  • Filling material made of two different substances, namely from a medium flexible layer of foam, jute, Metal wool or the like and outer layers from one synthetic foamable material.
  • the double-layer sheet foams the foamable Material and completely fills the cavities.
  • the invention is based on the object To create double-layer sheet of the type mentioned at the outset, that's a better ratio of area moment of inertia to Basis weight than the conventional one Double-layer sheets and not to fail due to buckling inclines.
  • Double layer sheet of the type mentioned above solved that the behavior of the filler at Compression of the double-layer sheet by one Bending load by at least two in the direction perpendicular to Significant moduli of elasticity are marked in the sheet plane is, with the filling material Plastic as a matrix with particles embedded in it from one that determines the harder modulus of elasticity Material exists and the expansion of the particles in Direction perpendicular to the sheet plane 2% to 8% smaller than is the distance of the cover plates.
  • the proportion of the filling material with the soft modulus of elasticity the bending line of the Double-layered sheet. If the bending force increases, then the proportion of the filling material with the harder Elastic modulus effective, which prevents the Closer cover plates and thereby the Moment of inertia of the double-layer sheet continues is reduced. Because the extension of the harder particles perpendicular to the sheet plane smaller than the distance of the Cover plates is at the beginning of the bending load Proportion of plastic in the filling material for determining the bending stiffness of the double-layer sheet, during the influence of the harder particles to bear comes when this after mutual approximation of the Cover plates due to increasing bending stress on it Plant come.
  • the softer modulus of elasticity should be perpendicular to Sheet plane (Z direction) may be less than 50 MPa while the harder one is much larger than 50 MPa and much more should be less than 210,000 MPa. He should preferably at least 500, more preferably 1,500 MPa.
  • a plastic is particularly suitable, whose modulus of elasticity in the Z direction is less than 20 MPa
  • a plastic is preferably used in which dispersed plastic hollow spheres are distributed that at a medium temperature that is below temperature for full curing (crosslinking), melt.
  • This is in particular a thermosetting one Material, because then the melting of the pore-forming hollow spheres are thermosetting Foam used as an intermediate layer in the double-layer sheet because of its dimensional stability a reshaping of the Double-layer sheet, especially deep drawing, without significant impairment of the rigidity of the Double layer sheet as a result of detachments and Cracks in the filler allowed and also Resistant to baking temperatures of up to approx. 220 ° C.
  • the Invention provided that as a plastic matrix serving portion of the filler dispersed Contains plastic hollow beads with up to 70 vol%, by melting in the filling material of the finished Partially distributed, closed pores produce.
  • the harder modulus of elasticity of the filling material is preferably determined by hard bodies in the Filling material with up to 10 vol% can be included or up to 5% of the weight of the double-layer sheet can be.
  • the mutual distance of all Hard body in the sheet metal level should on average 3 to 7 times the distance between the cover plates.
  • Hard bodies are those made of hollow glass spheres, Hollow ceramic balls or metal.
  • Hard body made of glass or Ceramics can only be used if that Double-layer sheet need not be weldable for assembly, that is, no current bridge for one Resistance welding of the cover plates is required. in the otherwise you will use metallic hard bodies.
  • the hard bodies should, however, have a lower hardness than the cover plates, so that they can Double-layer sheets do not damage the cover sheets.
  • As Mold for the hard body are hollow bodies, such as Example curved chips, speckled grain, fragments of Metal foam, for example from cast potted Melting steel, or hollow aluminum powder.
  • hollow bodies such as Example curved chips, speckled grain, fragments of Metal foam, for example from cast potted Melting steel, or hollow aluminum powder.
  • sharp-edged metal hard bodies for example curved steel or aluminum chips Carry out assembly welding without any problems, because with the Resistance welding the metal hard body that Plastic, not yet hardened Filling material when compressing the cover sheets cut through and then an electrical contact bridge between the cover plates at the welding site.
  • the filling material under heat to a tough state curing plastic can be used.
  • a tough state curing plastic Preferably should complete curing (crosslinking) between 150 ° C and 230 ° C.
  • the full curing in this Temperature range is advantageous in that Temperature range also the temperature for the branding of a varnish. Burning in the paint on the Double layer sheet and the full curing of the Plastic can then be done in one step.
  • the double-layer sheet is to be formed, should the transformation between the partial and Full hardening of the plastic of the filling material take place because in the partially cured state the forming without affecting the moment of inertia can be done.
  • the full curing can be done with epoxy resin be designed so that cracks and detachments heal.
  • Applying the filler with deformable Hard bodies can be extruded or in the form of a perforated mat according to the knob distribution partially cured plastic.
  • a plastic have thermosetting adhesives as more suitable than thermoplastic adhesive exposed.
  • epoxy glue is beneficial because this glue one, albeit low electrical conductivity have, which ensures that at a electrostatic painting also the cut edges of the Accept double-layer sheet of lacquer.
  • Embodiment shows on average Double-layer plate.
  • the double-layer sheet consists of two spaces between the forming cover plates 1,2 made of galvanized Steel sheet with a thickness of less than each 0.5 mm, in particular 0.30 mm, and from one Intermediate filling material 3. While the a cover plate 1, which when used as a body panel the outer skin forms, is smooth, shows the other Cover plate 2 truncated cones 4 on the End faces 4a welded to the smooth cover plate 1 or are soldered. The height of the knobs 4 and thus the Distance d of the cover plates 1,2 is between 1 and 5 mm. The knobs 4 have a distance of 15 mm to 40 mm.
  • the filler 3 consists of plastic, in particular an epoxy resin, a hardener, an accelerator and a hydrocarbon resin and serves as a matrix for various bodies embedded in it.
  • the Plastic 3 is designed so that it is at room temperature or slightly elevated temperature incomplete and glassy and at elevated temperatures of approx. 170 ° C to 210 ° C cures completely (cross-linked) to a tough state.
  • Such a plastic allows in the partially cured Condition of the forming, especially the deep drawing.
  • On such plastic is glued to the cover plates 1,2, which increases the shear strength of the double-layer sheet and thus the shear stress on the double-layer sheet relieved on the welded end faces of the knobs 4 becomes.
  • thermosetting Plastic made of thermoplastic or thermosetting Plastic up to a volume share of 70% embedded.
  • A is used as the material for the hollow spheres Plastic used at medium temperatures of approx. 140 ° C melts.
  • the hollow spheres then leave in the preferably thermosetting plastic closed cavities so that a thermoset foam is created.
  • Hard bodies in the plastic filling material embedded in the same or different types.
  • This Hard bodies preferably made of metal, can contain hollow spheres 6, Metal foam fragments 7, short curved metal chips 8 or so-called sputtering metal grain 9.
  • these hard bodies are finished in 6-9 Component perpendicular to the plane of the double-layer sheet one smaller expansion than the distance d of the cover plates 1.2 to have.
  • the individual hard bodies should be in the sheet metal plane a larger diameter than the distance d Cover plates have 1.2, while their distances in geometric mean in the sheet plane 3 to 7 times the distance d of the cover plates should be 1.2.
  • the Sum of the two possible distances in the Z direction Hard body 6-9 to cover plates 1.2 should be 2% to 8% the distance of the cover plates 1.2 in the finished formed Component.
  • the hard body at least 6-9 are sometimes sharp-edged to serve as a matrix Cut through filler 3 and before full curing the cover plates 1,2 in the paint baking device to be able to contact electrically.
  • the hard body As particularly suitable has evolved from the manufacture and use of chips Die-cast aluminum exposed because it becomes one Break off the 3 ⁇ 4 circle (3 to 8 mm diameter) and are sufficiently sharp with chip thicknesses of 0.2 to 0.4 mm.
  • the production of the double-layer sheet described takes place in such a way that with on the cover plate 2 knobs 4 facing the filling material 3 either by extrusion or in the form of a partially cured according to the distribution of the knobs 4 perforated mat is applied.
  • the metal hard body 6-9 which for Example 1-3% of the weight of the entire double-layer sheet make up, have a larger diameter or height than the later distance d the Cover plates 1,2.
  • the filling material is compared to the End faces 5 of the knobs 4 are applied somewhat exaggerated. Then the cover plate 1 is placed on the knobs pressurized and on the end faces 5 of the knobs welded, then completely up to the distance d pressurized to distribute the filling compound.
  • double-layer sheet is to be formed to it for example in vehicle construction Forming, especially deep drawing, before full Curing after partial curing. That state is well suited for forming.
  • vehicle construction Forming especially deep drawing
  • full Curing after partial curing That state is well suited for forming.
  • reshaping breakage and partial detachment of the intermediate layer of the cover layers take place, but this will Reversed the appearance because the Expand pores linearly by approx. 10% and that still Press adhesive mass onto the straps.
  • Duroplastic foam produced during full curing Temperatures not exceeding 200 ° C for 20 minutes flows out, so that the paint when baking the paint is not damaged by dripping.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft ein Doppellagenblech aus zwei einen Zwischenraum zwischen sich bildenden Deckblechen, von denen mindestens ein Deckblech als Noppenblech ausgebildet und an seinen Noppenspitzen mit dem anderen Deckblech verschweißt oder angelötet ist, und aus einem den Zwischenraum ausfüllenden Füllmaterial aus mindestens zwei verschiedenartigen Stoffen.The invention relates to a double-layer sheet made of two a space between the cover plates that form, at least one cover plate as a knobbed plate trained and at the tips of his nubs with the other Cover plate is welded or soldered, and from one filling material filling the space from at least two different types of fabric.

Doppellagenbleche dieser Art sind in verschiedenen Ausführungen bekannt (DE 195 03 166 A1; DE 196 06 981 A1; US-A 4,559,274; Stahl und Eisen 117 (1997), Nr. 10, Seite 46).Double-layer sheets of this type are available in different Versions known (DE 195 03 166 A1; DE 196 06 981 A1; US-A 4,559,274; Stahl und Eisen 117 (1997), No. 10, page 46).

Solche auch als Noppenbleche bezeichneten Doppellagenbleche finden vor allem Anwendung im Fahrzeugbau, weil sie sich durch eine hohe Steifigkeit bei relativ geringem Gewicht auszeichnen und noch in gewissen Grenzen umformbar, insbesondere tiefziehfähig, sind. Die charakteristische Dicke der Deckbleche liegt unter 1 mm, insbesondere unter 0,5 mm, und die des Füllmaterials zwischen 1 und 5 mm. Als Füllmaterial werden bei den bekannten Doppellagenblechen verschiedene Materialien, zum Beispiel gelochte Matten, insbesondere aus Kunststoff oder Zellulose, oder aber auch gelochte Aluminiumbleche, eingelegt. Bei gelochten Matten oder Aluminiumblechen greifen die Noppen des Noppenbleches durch die Löcher der Matte. Such also referred to as knobbed sheets Double-layer sheets are mainly used in Vehicle construction because of its high rigidity at relatively light weight and still in certain limits can be formed, especially deep-drawing, are. The characteristic thickness of the cover plates lies less than 1 mm, especially less than 0.5 mm, and that of Filling material between 1 and 5 mm. As filling material are different in the known double-layer sheets Materials, for example perforated mats, in particular made of plastic or cellulose, or perforated Aluminum sheets, inserted. With perforated mats or Aluminum sheets grip the knobs of the knobbed sheet through the holes in the mat.

Bei einem weichen Füllmaterial wie Zellulose wird das Füllmaterial bei einer Biegebelastung des Bleches zusammengedrückt, so daß schon bei verhältnismäßig leichten Lasten die Biegesteifigkeit des Bleches schnell abnimmt. Bei einem gelochten Aluminiumblech als Füllmaterial verhindert das Aluminiumblech, daß sich die Deckbleche stark annähern, weil das Aluminiumblech die Deckbleche abstützt. Bei zunehmender Biegebelastung besteht allerdings die Gefahr, daß das dem Angriffspunkt der Biegekraft gegenüberliegende, als Zuggurt wirkende Deckblech sich strafft und über das Aluminiumblech das als Druckgurt wirkende, dem Angriffspunkt der Biegekraft zugewandte Deckblech entgegen der Kraftrichtung der Biegekraft ausknickt.With a soft filling material such as cellulose, this becomes Filling material when the sheet is subjected to bending stress squeezed, so that even in proportion light loads the bending stiffness of the sheet quickly decreases. With a perforated aluminum sheet as Filling material prevents the aluminum sheet that the Close the cover plates closely because the aluminum plate Supports cover plates. With increasing bending load however, there is a risk that the point of attack the bending force opposite, acting as a tension belt Cover plate tightens and over the aluminum plate acting as a compression belt, the point of application of the bending force facing cover plate against the direction of force of the Bending force buckles.

Neben der Forderung, ein Doppellagenblech mit hoher Steifigkeit bei geringem Flächengewicht zu schaffen, besteht eine Forderung darin, es mit möglichst geringem Aufwand herzustellen. Es versteht sich, daß der Aufwand um so geringer ist, je weiter die Schweißstellen an den Noppenspitzen auseinander liegen.In addition to the requirement of a double-layer sheet with high To create rigidity with a low basis weight, one requirement is to make it as small as possible Manufacturing effort. It is understood that the effort the lower the welds at the The tips of the nubs are apart.

Ferner ist ein Doppellagenblech bekannt (US-A 4,559,274), dessen Deckbleche als Noppelbleche ausgebildet und an den Noppen miteinander verschweißt sind. In den Zwischenräumen zwischen den Deckblechen ist ein Füllmaterial aus zwei verschiedenen Stoffen, und zwar aus einer mittleren flexiblen Lage aus Schaumstoff, Jute, Metallwolle oder dergleichen und äußeren Lagen aus einem synthetischen schäumbaren Material angeordnet. Beim Erwärmen des Doppellagenbleches schäumt das aufschäumbare Material auf und füllt die Hohlräume vollständig aus. Über das individuelle Umformverhalten der verschiedenartigen Stoffe findet sich im Stand der Technik keine Aussage.Furthermore, a double-layer sheet is known (US-A 4,559,274), whose cover plates are designed as double plates and on the Studs are welded together. In the There is a space between the cover plates Filling material made of two different substances, namely from a medium flexible layer of foam, jute, Metal wool or the like and outer layers from one synthetic foamable material. At the Heating the double-layer sheet foams the foamable Material and completely fills the cavities. About the individual forming behavior of the various substances can be found in the Technology no statement.

Der Erfindung liegt die Aufgabe zugrunde, ein Doppellagenblech der eingangs genannten Art zu schaffen, das ein besseres Verhältnis von Flächenträgheitsmoment zu Flächengewicht hat als die herkömmlichen Doppellagenbleche und nicht zum Versagen durch Ausknicken neigt.The invention is based on the object To create double-layer sheet of the type mentioned at the outset, that's a better ratio of area moment of inertia to Basis weight than the conventional one Double-layer sheets and not to fail due to buckling inclines.

Diese Aufgabe wird erfindungsgemäß mit einem Doppellagenblech der eingangs genannten Art dadurch gelöst, daß das Verhalten des Füllmaterials beim Zusammendrücken des Doppellagenbleches durch eine Biegelast durch mindestens zwei in Richtung senkrecht zur Blechebene maßgebende Elastizitätsmoduli gekennzeichnet ist, wobei das Füllmaterial aus Kunststoff als Matrix mit darin eingebetteten Partikeln aus einem den härteren Elastizitätsmodul bestimmenden Material besteht und die Ausdehnung der Partikel in Richtung senkrecht zur Blechebene 2% bis 8% kleiner als der Abstand der Deckbleche ist.This object is achieved with a Double layer sheet of the type mentioned above solved that the behavior of the filler at Compression of the double-layer sheet by one Bending load by at least two in the direction perpendicular to Significant moduli of elasticity are marked in the sheet plane is, with the filling material Plastic as a matrix with particles embedded in it from one that determines the harder modulus of elasticity Material exists and the expansion of the particles in Direction perpendicular to the sheet plane 2% to 8% smaller than is the distance of the cover plates.

Bei dem erfindungsgemäßen Doppellagenblech bestimmt bei leichter Biegekraft der Anteil des Füllmaterials mit dem weichen Elastizitätsmodul die Biegelinie des Doppellagenbleches. Steigt die Biegekraft an, dann wird der Anteil des Füllmaterials mit dem härteren Elastizitätsmodul wirksam, der verhindert, daß sich die Deckbleche weiter annähern und dadurch das Trägheitsmoment des Doppellagenbleches immer weiter vermindert wird. Da die Erstreckung der härteren Partikel senkrecht zur Blechebene kleiner als der Abstand der Deckbleche ist, ist am Anfang der Biegebelastung der Anteil an Kunststoff des Füllmaterials für die Biegesteifigkeit des Doppellagenbleches bestimmend, während der Einfluß der härteren Partikel zum Tragen kommt, wenn diese nach gegenseitiger Annäherung der Deckbleche infolge zunehmender Biegebelastung daran zur Anlage kommen.In the double-layer sheet according to the invention determined at slight bending force the proportion of the filling material with the soft modulus of elasticity the bending line of the Double-layered sheet. If the bending force increases, then the proportion of the filling material with the harder Elastic modulus effective, which prevents the Closer cover plates and thereby the Moment of inertia of the double-layer sheet continues is reduced. Because the extension of the harder particles perpendicular to the sheet plane smaller than the distance of the Cover plates is at the beginning of the bending load Proportion of plastic in the filling material for determining the bending stiffness of the double-layer sheet, during the influence of the harder particles to bear comes when this after mutual approximation of the Cover plates due to increasing bending stress on it Plant come.

Um die durch Biegung hervorgerufene Schubbelastung der Gurte gegeneinander bei einem Minimum an Schweißstellen an den Noppenspitzen besser vertragen zu können, ist nach einer Ausgestaltung der Erfindung vorgesehen, daß das Füllmaterial mit den Deckblechen vollflächig verklebt ist.To the shear stress caused by bending Belts against each other with a minimum of welds To be better tolerated at the tips of the nubs is after an embodiment of the invention provided that Filling material fully glued to the cover plates is.

Der weichere Elastizitätsmodul sollte senkrecht zur Blechebene (Z-Richtung) kleiner als 50 MPa sein, während der härtere wesentlich größer als 50 MPa und wesentlich kleiner als 210.000 MPa sein sollte. Er sollte vorzugsweise mindestens 500, besser 1.500 MPa, betragen.The softer modulus of elasticity should be perpendicular to Sheet plane (Z direction) may be less than 50 MPa while the harder one is much larger than 50 MPa and much more should be less than 210,000 MPa. He should preferably at least 500, more preferably 1,500 MPa.

Als den die Matrix bildenden Kunststoffanteil des Füllmaterials eignet sich besonders ein Kunststoff, dessen Elastizitätsmodul in Z-Richtung kleiner als 20 MPa ist.Vorzugsweise wird ein Kunststoff verwendet, in dem dispergierte Kunststoff-Hohlkügelchen verteilt sind, die bei einer mittleren Temperatur, die unter der Temperatur für die Vollaushärtung (Vernetzung) liegt, schmelzen. Dabei handelt es sich insbesondere um ein duroplastisches Material, denn dann entsteht durch das Aufschmelzen der die Poren bildenden Hohlkügelchen ein duroplastischer Schaumstoff, der als Zwischenlage in dem Doppellagenblech wegen seiner Formstabilität ein Umformen des Doppellagenbleches, insbesondere Tiefziehen, ohne wesentliche Beeinträchtigung der Steifigkeit des Doppellagenbleches infolge von Ablösungen und Rißbildungen im Füllstoff erlaubt und außerdem Lackeinbrenntemperaturen von bis zu ca. 220°C verträgt.As the plastic part of the matrix forming the matrix A plastic is particularly suitable, whose modulus of elasticity in the Z direction is less than 20 MPa A plastic is preferably used in which dispersed plastic hollow spheres are distributed that at a medium temperature that is below temperature for full curing (crosslinking), melt. This is in particular a thermosetting one Material, because then the melting of the pore-forming hollow spheres are thermosetting Foam used as an intermediate layer in the double-layer sheet because of its dimensional stability a reshaping of the Double-layer sheet, especially deep drawing, without significant impairment of the rigidity of the Double layer sheet as a result of detachments and Cracks in the filler allowed and also Resistant to baking temperatures of up to approx. 220 ° C.

Um das Flächengewicht des Doppellagenbleches möglichst niedrig zu halten, ist nach einer Ausgestaltung der Erfindung vorgesehen, daß der als Matrix aus Kunststoff dienende Anteil des Füllmaterials dispergierte Hohlkügelchen aus Kunststoff mit bis zu 70 Vol% enthält, die durch Aufschmelzen im Füllmaterial des fertigen Bauteils verteilte, gegeneinander abgeschlossene Poren erzeugen.To the basis weight of the double-layer sheet, if possible According to one embodiment, keeping it low is the Invention provided that as a plastic matrix serving portion of the filler dispersed Contains plastic hollow beads with up to 70 vol%, by melting in the filling material of the finished Partially distributed, closed pores produce.

Der härtere Elastizitätsmodul des Füllmaterials wird vorzugsweise von Hartkörpern bestimmt, die in dem Füllmaterial mit bis zu 10 Vol% enthalten sein können oder bis zu 5 % des Gewichtes des Doppellagenbleches betragen können. Der gegenseitige Abstand aller Hartkörper in der Blechebene sollte im Durchschnitt das 3 bis 7fache des Abstandes der Deckbleche betragen. Als Hartkörper eignen sich solche aus Glashohlkugeln, Keramikhohlkugeln oder Metall. Hartkörper aus Glas oder Keramik sind allerdings nur dann verwendbar, wenn das Doppellagenblech nicht montageschweißbar zu sein braucht, das heißt, keine Strombrücke für eine Widerstandsschweißung der Deckbleche benötigt wird. Im anderen Fall wird man metallische Hartkörper verwenden. Die Hartkörper sollten allerdings eine geringere Härte als die Deckbleche haben, damit sie bei der Umformung des Doppellagenbleches nicht die Deckbleche beschädigen. Als Form fur die Hartkörper eignen sich Hohlkörper, wie zum Beispiel gebogene Späne, spratziges Korn, Bruchstücke von Metallschaum, zum Beispiel aus unberuhigt vergossener Stahlschmelze, oder Aluminium-Hohlpulver. Im Falle von scharfkantigen metallenen Hartkörpern, zum Beispiel aus gebogenen Stahl- oder Aluminiumspänen, lassen sich problemlos Montageschweißungen durchführen, weil bei der Widerstandsschweißung die metallenen Hartkörper das aus Kunststoff bestehende, noch nicht ausgehärtete Füllmaterial beim Zusammendrücken der Deckbleche durchschneiden und dann eine elektrische Kontaktbrücke zwischen den Deckblechen am Schweißort bilden.The harder modulus of elasticity of the filling material is preferably determined by hard bodies in the Filling material with up to 10 vol% can be included or up to 5% of the weight of the double-layer sheet can be. The mutual distance of all Hard body in the sheet metal level should on average 3 to 7 times the distance between the cover plates. As Hard bodies are those made of hollow glass spheres, Hollow ceramic balls or metal. Hard body made of glass or Ceramics can only be used if that Double-layer sheet need not be weldable for assembly, that is, no current bridge for one Resistance welding of the cover plates is required. in the otherwise you will use metallic hard bodies. The hard bodies should, however, have a lower hardness than the cover plates, so that they can Double-layer sheets do not damage the cover sheets. As Mold for the hard body are hollow bodies, such as Example curved chips, speckled grain, fragments of Metal foam, for example from cast potted Melting steel, or hollow aluminum powder. In case of sharp-edged metal hard bodies, for example curved steel or aluminum chips Carry out assembly welding without any problems, because with the Resistance welding the metal hard body that Plastic, not yet hardened Filling material when compressing the cover sheets cut through and then an electrical contact bridge between the cover plates at the welding site.

Nach einem weiteren Vorschlag der Erfindung sollte für das Füllmaterial ein unter Wärme zu einem zähen Zustand aushärtender Kunststoff verwendet werden. Vorzugsweise sollte die vollständige Aushärtung (Vernetzung) zwischen 150°C und 230°C erfolgen. Die volle Aushärtung in diesem Temperaturbereich ist insofern von Vorteil, als in diesem Temperaturbereich auch die Temperatur für das Einbrennen eines Lackes liegt. Das Einbrennen des Lackes auf dem Doppellagenblech und die volle Aushärtung des Kunststoffes kann dann in einem Arbeitsschritt erfolgen.According to a further proposal of the invention for the filling material under heat to a tough state curing plastic can be used. Preferably should complete curing (crosslinking) between 150 ° C and 230 ° C. The full curing in this Temperature range is advantageous in that Temperature range also the temperature for the branding of a varnish. Burning in the paint on the Double layer sheet and the full curing of the Plastic can then be done in one step.

Gegenstand der Erfindung ist ferner ein Verfahren zum Herstellen eines Doppellagenbleches, das unter Verwendung von metallischen Hartkörpern durch folgende Schritte gekennzeichnet ist:

  • a) Auf die genoppte Seite des als Noppenblech ausgebildeten Deckbleches wird das Füllmaterial aus Kunststoff mit darin als Hartkörpern eingebetteten Partikeln aufgetragen, deren senkrecht zur Blechebene maßgebender Elastizitätsmodul härter als der des Kunststoffes ist und die eine Erstreckung senkrecht zur Blechebene haben, die mindestens so groß wie der Abstand der Deckbleche ist.
  • b) Das andere Deckblech wird aufgelegt, angedrückt, damit die Füllmenge ausgebreitet wird, und an das Noppenblech im Bereich der Noppenspitzen angeschweißt oder hartgelötet.
  • c) Nach einer Teilaushärtung des Kunststoffes wird das Doppellagenblech mit Druck. derart beaufschlagt, daß die Partikel verformt und auf eine unter dem Abstand der Deckbleche liegende Größe verkleinert werden, sodaß sie nach Druckentlastung eine um 2% bis 8% unter dem Abstand der Deckbleche liegende Erstreckung senkrecht zur Blechebene haben.
  • d) Nach Druckentlastung wird das Füllmaterial zu einem zähen Zustand ausgehärtet.
    • The invention further relates to a method for producing a double-layer sheet, which is characterized by the following steps using metallic hard bodies:
  • a) The filling material made of plastic with particles embedded therein as hard bodies is applied to the nubbed side of the cover sheet, the elastic modulus of which is perpendicular to the sheet plane and is harder than that of the plastic and which has an extent perpendicular to the sheet plane which is at least as large as is the distance of the cover plates.
  • b) The other cover plate is placed on, pressed so that the filling quantity is spread out, and welded or brazed to the knobbed plate in the area of the knob tips.
  • c) After partial curing of the plastic, the double-layer sheet with pressure. acted upon in such a way that the particles are deformed and reduced to a size below the distance between the cover plates, so that after relief of pressure they have an extension perpendicular to the plane of the plate which is 2% to 8% below the distance between the cover plates.
  • d) After pressure relief, the filling material is hardened to a tough state.

    • Nach dem Anschweißen beziehungsweise Hartlöten im Bereich der Noppenspitzen sollte das Deckblech nachgedrückt werden, um das Füllmaterial in verbliebene Zwischenräume zu verteilen.After welding or brazing in The area of the nub tips should be the cover plate be refilled to fill the remaining material To distribute spaces.

    Sofern das Doppellagenblech umgeformt werden soll, sollte die Umformung zwischen der Teil- und Vollaushärtung des Kunststoffes des Füllmaterials erfolgen, weil im teilausgehärteten Zustand das Umformen ohne Beeinträchtigung des Flächenträgheitsmomentes erfolgen kann. Würde man vollausgehärtet umformen, könnten Risse in der Füllmasse und Ablösungen von den Gurten auftreten. Die Vollaushärtung kann mit Epoxidharz so ausgestaltet werden, daß Risse und Ablösungen ausheilen. If the double-layer sheet is to be formed, should the transformation between the partial and Full hardening of the plastic of the filling material take place because in the partially cured state the forming without affecting the moment of inertia can be done. Would you shape fully hardened there could be cracks in the filling compound and detachments from the Belts occur. The full curing can be done with epoxy resin be designed so that cracks and detachments heal.

    Das Auftragen des Füllmaterials mit verformbaren Hartkörpern kann durch Extrudieren oder in Form einer entsprechend der Noppenverteilung gelochten Matte aus teilausgehärtetem Kunststoff erfolgen. Als Kunststoff haben sich duroplastische Kleber als geeigneter als thermoplastische Kleber herausgestellt. Die Verwendung von Epoxidklebern ist von Vorteil, weil diese Kleber eine, wenn auch geringe elektrische Leitfähigkeit aufweisen, die gewährleistet, daß bei einem elektrostatischen Lackieren auch die Schnittkanten des Doppellagenbleches Lack annehmen.Applying the filler with deformable Hard bodies can be extruded or in the form of a perforated mat according to the knob distribution partially cured plastic. As a plastic have thermosetting adhesives as more suitable than thermoplastic adhesive exposed. The usage of epoxy glue is beneficial because this glue one, albeit low electrical conductivity have, which ensures that at a electrostatic painting also the cut edges of the Accept double-layer sheet of lacquer.

    Im folgenden wird die Erfindung anhand eines Ausführungsbeispieles näher erläutert. Das Ausführungsbeispiel zeigt im Schnitt ein Doppellagenblech.In the following the invention is based on a Embodiment explained in more detail. The Embodiment shows on average Double-layer plate.

    Das Doppellagenblech besteht aus zwei einen Zwischenraum zwischen sich bildenden Deckblechen 1,2 aus verzinktem Stahlblech mit einer Dicke von jeweils weniger als 0,5 mm, insbesondere 0,30 mm, und aus einem den Zwischenraum ausfüllenden Füllmaterial 3. Während das eine Deckblech 1, das bei Verwendung als Karosserieblech die Außenhaut bildet, glatt ist, weist das andere Deckblech 2 kegelstumpfförmige Noppen 4 auf, die an den Stirnflächen 4a mit dem glatten Deckblech 1 verschweißt oder angelötet sind. Die Höhe der Noppen 4 und damit der Abstand d der Deckbleche 1,2 liegt zwischen 1 und 5 mm. Die Noppen 4 haben einen Abstand von 15 mm bis 40 mm.The double-layer sheet consists of two spaces between the forming cover plates 1,2 made of galvanized Steel sheet with a thickness of less than each 0.5 mm, in particular 0.30 mm, and from one Intermediate filling material 3. While the a cover plate 1, which when used as a body panel the outer skin forms, is smooth, shows the other Cover plate 2 truncated cones 4 on the End faces 4a welded to the smooth cover plate 1 or are soldered. The height of the knobs 4 and thus the Distance d of the cover plates 1,2 is between 1 and 5 mm. The knobs 4 have a distance of 15 mm to 40 mm.

    Das Füllmaterial 3 besteht aus Kunststoff, insbesondere einem Epoxidharz, einem Härter, einem Beschleuniger und einem Kohlenwasserstoffharz und dient als Matrix für darin eingebettete verschiedenartige Körper. Der Kunststoff 3 ist so beschaffen, daß er bei Raumtemperatur oder leicht erhöhter Temperatur unvollständig und glasig und bei erhöhten Temperaturen von ca. 170°C bis 210°C vollständig (vernetzt) zu einem zähen Zustand aushärtet. Ein derartiger Kunststoff erlaubt im teilausgehärteten Zustand die Umformung, insbesondere das Tiefziehen. Ein solcher Kunststoff ist mit den Deckblechen 1,2 verklebt, wodurch die Schubfestigkeit des Doppellagenbleches erhöht und damit die Scherbeanspruchung des Doppellagenbleches an den verschweißten Stirnseiten der Noppen 4 entlastet wird.The filler 3 consists of plastic, in particular an epoxy resin, a hardener, an accelerator and a hydrocarbon resin and serves as a matrix for various bodies embedded in it. The Plastic 3 is designed so that it is at room temperature or slightly elevated temperature incomplete and glassy and at elevated temperatures of approx. 170 ° C to 210 ° C cures completely (cross-linked) to a tough state. Such a plastic allows in the partially cured Condition of the forming, especially the deep drawing. On such plastic is glued to the cover plates 1,2, which increases the shear strength of the double-layer sheet and thus the shear stress on the double-layer sheet relieved on the welded end faces of the knobs 4 becomes.

    Zur Verminderung des Flächengewichtes sind in dem Kunststoff-Füllmaterial 3 eine Vielzahl von sehr kleinen Hohlkügelchen aus thermoplastischem oder duroplastischem Kunststoff bis zu einem Volumenanteil von 70% eingebettet. Als Material für die Hohlkügelchen wird ein Kunststoff verwendet, der bei mittleren Temperaturen von ca. 140°C schmilzt. Die Hohlkügelchen hinterlassen dann in dem vorzugsweise duroplastischen Kunststoff gegeneinander abgeschlossene Hohlräume, so daß ein duroplastischer Schaumstoff entsteht.To reduce the basis weight are in the Plastic filler 3 a variety of very small Hollow spheres made of thermoplastic or thermosetting Plastic up to a volume share of 70% embedded. A is used as the material for the hollow spheres Plastic used at medium temperatures of approx. 140 ° C melts. The hollow spheres then leave in the preferably thermosetting plastic closed cavities so that a thermoset foam is created.

    Außerdem sind in dem Kunststoff-Füllmaterial 3 Hartkörper derselben Art oder verschiedener Art eingebettet. Diese Hartkörper, vorzugsweise aus Metall, können Hohlkugeln 6, Metallschaumbruchstücke 7, kurze gebogene Metallspäne 8 oder sogenanntes spratziges Metallkorn 9 sein. Wichtig ist, daß diese Hartkörper 6-9 im umgeformten fertigen Bauteil senkrecht zur Ebene des Doppellagenbleches eine geringere Ausdehnung als der Abstand d der Deckbleche 1,2 haben. In der Blechebene sollten die einzelnen Hartkörper einen größeren Durchmesser als den Abstand d der Deckbleche 1,2 haben, während ihre Abstände im geometrischen Mittel in der Blechebene das 3 bis 7fache des Abstandes d der Deckbleche 1,2 betragen sollte. Die Summe der in Z-Richtung zwei möglichen Abstände der Hartkörper 6-9 zu den Deckblechen 1,2 sollte 2% bis 8% des Abstandes der Deckbleche 1,2 im fertig umgeformten Bauteil betragen.In addition, there are 3 hard bodies in the plastic filling material embedded in the same or different types. This Hard bodies, preferably made of metal, can contain hollow spheres 6, Metal foam fragments 7, short curved metal chips 8 or so-called sputtering metal grain 9. Important is that these hard bodies are finished in 6-9 Component perpendicular to the plane of the double-layer sheet one smaller expansion than the distance d of the cover plates 1.2 to have. The individual hard bodies should be in the sheet metal plane a larger diameter than the distance d Cover plates have 1.2, while their distances in geometric mean in the sheet plane 3 to 7 times the distance d of the cover plates should be 1.2. The Sum of the two possible distances in the Z direction Hard body 6-9 to cover plates 1.2 should be 2% to 8% the distance of the cover plates 1.2 in the finished formed Component.

    Auch ist von Bedeutung, daß die Hartkörper 6-9 zumindest teilweise scharfkantig sind, um das als Matrix dienende Füllmaterial 3 durchschneiden und vor der Vollaushärtung in der Lackeinbrenneinrichtung die Deckbleche 1,2 elektrisch kontaktieren zu können. Als besonders geeignet hat sich die Herstellung und Verwendung von Spänen aus Aluminiumdruckguß herausgestellt, weil sie zu einem ¾-Kreis (3 bis 8 mm Durchmesser) gebogen abbrechen und genügend scharfkantig sind bei Spandicken von 0,2 bis 0,4 mm.It is also important that the hard body at least 6-9 are sometimes sharp-edged to serve as a matrix Cut through filler 3 and before full curing the cover plates 1,2 in the paint baking device to be able to contact electrically. As particularly suitable has evolved from the manufacture and use of chips Die-cast aluminum exposed because it becomes one Break off the ¾ circle (3 to 8 mm diameter) and are sufficiently sharp with chip thicknesses of 0.2 to 0.4 mm.

    Die Herstellung des beschriebenen Doppellagenbleches erfolgt in der Weise, daß auf das Deckblech 2 mit nach oben gerichteten Noppen 4 das Füllmaterial 3 entweder durch Extrusion oder in Form einer teilausgehärteten entsprechend der Verteilung der Noppen 4 gelochten Matte aufgetragen wird. Die metallenen Hartkörper 6-9, die zum Beispiel 1-3% des Gewichts des ganzen Doppellagenbleches ausmachen, haben einen größeren Durchmesser beziehungsweise Höhe als der spätere Abstand d der Deckbleche 1,2. Das Füllmaterial wird gegenüber den Stirnflächen 5 der Noppen 4 etwas überhöht aufgetragen. Dann wird das Deckblech 1 aufgelegt, an den Noppen druckbeaufschlagt und an den Stirnflächen 5 der Noppen verschweißt, dann vollständig bis auf den Abstand d druckbeaufschlagt, um die Füllmasse zu verteilen. Nach einer Teilaushärtung des Füllmaterials 3 erfolgt eine erneute Druckbeaufschlagung in einem geeigneten Werkzeug (Tiefziehwerkzeug, Walzenpaar, Presse) derart, daß die zu großen Hartkörper 6-9 auf eine Größe verkleinert werden, die kleiner als der spätere Abstand d der Deckbleche 1,2 ist. Aufgrund der Noppen- und Schaum-Elastizität federt es nach Druckentlastung bis auf die Dicke d zurück. Die volle Aushärtung erfolgt entweder sofort danach oder beim späteren Einbrennlackieren.The production of the double-layer sheet described takes place in such a way that with on the cover plate 2 knobs 4 facing the filling material 3 either by extrusion or in the form of a partially cured according to the distribution of the knobs 4 perforated mat is applied. The metal hard body 6-9, which for Example 1-3% of the weight of the entire double-layer sheet make up, have a larger diameter or height than the later distance d the Cover plates 1,2. The filling material is compared to the End faces 5 of the knobs 4 are applied somewhat exaggerated. Then the cover plate 1 is placed on the knobs pressurized and on the end faces 5 of the knobs welded, then completely up to the distance d pressurized to distribute the filling compound. To a partial curing of the filling material 3 takes place pressurized again in a suitable tool (Deep-drawing tool, pair of rollers, press) such that the too large hard body 6-9 can be reduced to one size, which is smaller than the later distance d of the cover plates 1.2 is. Due to the nub and foam elasticity springs it back to thickness d after relieving pressure. The full curing takes place either immediately afterwards or at later stove enamelling.

    Sofern das Doppellagenblech umgeformt werden soll, um es zum Beispiel im Fahrzeugbau einzusetzen, erfolgt die Umformung, insbesondere das Tiefziehen, vor der vollen Aushärtung nach der Teilaushärtung. Dieser Zustand ist für das Umformen gut geeignet. Beim Umformen kann zwar ein Brechen und teilweises Ablösen der Zwischenschicht von den Deckschichten stattfinden, doch wird diese Erscheinung wieder rückgängig gemacht, weil sich die Poren um ca. 10% linear ausdehnen und die noch klebefähige Masse an die Gurte drücken. Es hat sich auch gezeigt, daß insbesondere ein wie oben beschrieben hergestellter Duroplastschaum bei der Vollaushärtung bei Temperaturen bis über 200°C über 20 Minuten nicht ausfließt, so daß die Lackierung bei der Lackeinbrennung nicht durch Tropfenlauf beschädigt wird.Unless the double-layer sheet is to be formed to it for example in vehicle construction Forming, especially deep drawing, before full Curing after partial curing. That state is well suited for forming. When reshaping breakage and partial detachment of the intermediate layer of the cover layers take place, but this will Reversed the appearance because the Expand pores linearly by approx. 10% and that still Press adhesive mass onto the straps. It has too shown that in particular one as described above Duroplastic foam produced during full curing Temperatures not exceeding 200 ° C for 20 minutes flows out, so that the paint when baking the paint is not damaged by dripping.

    Claims (17)

    1. A double-layered sheet comprising two cover sheets with a space between them, with at least one of said cover sheets being a burled sheet being welded or solded to the other cover sheet at the extremities of its burls, and comprising a fill material filling the space between the cover sheets, said fill material being made of at least two different materials, characterised in that the behaviour of the fill material during pressing together of the double-layered sheet under operational loads is characterised by at least two moduli of elasticity in vertical direction to the sheet plane, wherein the fill material of preferably elastic plastic is a matrix with particles embedded therein of a material determining the harder elasticity modulus and wherein the extension of the particles in the direction perpendicular of the sheet plane is by 2% to 8% smaller than the distance of the cover sheets.
    2. The double-layered sheet according to claim 1, characterised in that the fill material is bonded to the cover sheets over the entire surface.
    3. The double-layered sheet according to claim 1 or 2, characterised in that the softer elasticity modulus is less than 50 MPa.
    4. The double-layered sheet according to one of claims 1 to 3, characterised in that the harder elasticity modulus exceeds 500 MPa.
    5. The double-layered sheet according to one of claims 1 to 4, characterised in that the harder elasticity modulus is significantly less than 210,000 MPa.
    6. The double-layered sheet according to one of claims 1 to 5, characterised in that the elastic plastic is porous.
    7. The double-layered sheet according to one of claims 1 to 6, characterised in that elasticity modulus of the fill material without the embedded particles is less than 20 MPa.
    8. The double-layered sheet according to claim 6, characterised in that the pores which are sealed off from each other account for up to 70 % by volume of the fill material.
    9. The double-layered sheet according to one of claims 1 to 8, characterised in that the fill material, by way of embedded particles which essentially determine the harder elasticity modulus, comprise hard bodies accounting for up to 10 % by volume of for up to 5 % by weight of the double-layered sheet.
    10. The double-layered sheet according to claim 9, characterised in that the hard bodies comprise glass, ceramic or metal.
    11. The double-layered sheet according to claim 9 or 10,
      characterised in that on average the mutual distance between all hard bodies in the sheet plane is 3 to 7 times the distance of the cover sheets.
    12. The double-layered sheet according to claim 11, characterised in that the hard bodies comprise bent chips, foam, spattered grain or hollow powder as hollow shapes.
    13. The double-layered sheet according to one of claims 10 to 12,
      characterised in that the metal hard bodies comprise steel, titanium, aluminium or magnesium.
    14. The double-layered sheet according to one of claims 1 to 13,
      characterised in that the plastic for the fill material cures to a viscous/tenacious state when subjected to heat.
    15. The double-layered sheet according to claim 14, characterised in that the plastic completely cures at temperatures between 150°C and 230°C
    16. The method for producing a double-layered sheet according to claim 1, characterised by the following steps:
      a) The fill material of preferably elastic plastic with particles embedded therein is applied to the burled side of the burled sheet, wherein the elasticity modulus of the particles is harder than the elasticity modulus of the plastic and wherein perpendicular to the sheet plane is at least equal to the distance between the cover sheets.
      b) The other cover sheet is applied, pressed on and then welded or hard soldered in the region of the extremities of the burls.
      c) Following partial curing of the plastic, the double-layered sheet is subjected to pressure such that the hard bodies are deformed and reduced to a size smaller than that of the distance between the cover sheets, so that after release of pressure they have an extension perpendicular to the sheet plane which is by 2 % to 8 % less than the distance of the cover sheets.
      d) After pressure release, the fill material is cured to a viscous/tenacious state.
    17. The method according to claim 16, characterised in that after welding-on or hard soldering the cover sheets at the extremities of the burls, the fill material is distributed to any remaining spaces by pressing-on the cover sheet anew.
    EP99915552A 1998-03-12 1999-03-09 Double sheet metal consisting of two covering metal sheets and an intermediate layer Expired - Lifetime EP1062397B1 (en)

    Applications Claiming Priority (3)

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    DE19810706 1998-03-12
    DE19810706A DE19810706C2 (en) 1998-03-12 1998-03-12 Double-layer sheet consisting of two cover sheets and an intermediate layer
    PCT/EP1999/001513 WO1999046461A1 (en) 1998-03-12 1999-03-09 Double sheet metal consisting of two covering metal sheets and an intermediate layer

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    EP1062397A1 EP1062397A1 (en) 2000-12-27
    EP1062397B1 true EP1062397B1 (en) 2003-05-21

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    EP (1) EP1062397B1 (en)
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    WO1999046461A1 (en) 1999-09-16
    US6428905B1 (en) 2002-08-06
    DE19810706A1 (en) 1999-09-16
    DE59905644D1 (en) 2003-06-26
    DE19810706C2 (en) 2002-09-12
    EP1062397A1 (en) 2000-12-27

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