WO2006111349A1 - Metal foam sandwich structures and method for shaping the same - Google Patents

Metal foam sandwich structures and method for shaping the same Download PDF

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Publication number
WO2006111349A1
WO2006111349A1 PCT/EP2006/003524 EP2006003524W WO2006111349A1 WO 2006111349 A1 WO2006111349 A1 WO 2006111349A1 EP 2006003524 W EP2006003524 W EP 2006003524W WO 2006111349 A1 WO2006111349 A1 WO 2006111349A1
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WIPO (PCT)
Prior art keywords
metal foam
shaping
core
forming
temperature
Prior art date
Application number
PCT/EP2006/003524
Other languages
German (de)
French (fr)
Inventor
Hans-Wolfgang Seeliger
Dirk Schwingel
Original Assignee
Alm Gmbh
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Publication date
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Publication of WO2006111349A1 publication Critical patent/WO2006111349A1/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
    • E04C2/08—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of metal, e.g. sheet metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
    • B22F7/006—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part the porous part being obtained by foaming
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • metal foams as lightweight structures have been the subject of research and some already in technical application.
  • metal foam sandwiches have proven to be particularly interesting, which are usually built up in three layers from a metal foam core and these outer layers closing off to the outside. If it is in principle possible to produce such sandwich structures by gluing the cover layers to the foam core layer, then other production methods have become established in which the unfoamed core material is bonded to the cover layers, for example by means of rolling metallic, similar to roll plating. Such production processes are known, for example, from EP 0 997 215 A2 or EP 1 000 690 A2.
  • the core layer of the resulting semi-finished product is then foamed in a heating process by means of a contained in the core layer and thermally activated blowing agent, wherein the metallic connection of the core is maintained at the cover layers.
  • the resulting metal foam sandwich structure is completely free of any adhesives and thus temperature-resistant below the melting temperature of the metal, so that in contrast to bonded sandwich structures and heat-generating bonding techniques such as welding can be used.
  • Such metal foam sandwich structures are also of great interest because shaping processes known from sheet metal transformation can be used to reform either the unfoamed semi-finished product or else the foamed sandwich material. In this way, unlike most other sandwich materials, it is possible to create complex, 3-dimensional geometries.
  • the present invention seeks to counteract this disadvantage.
  • the sandwich material before forming or compacting to a temperature above the ambient temperature - but below the melting temperature of the metal foam core - heated.
  • the metal foam core has as a result of the action according to the invention on the metal foam sandwich structure at least one area in which the foam cells are partially flattened and the cell walls are folded like a lamella.
  • Foam core is particularly suitable aluminum foam.
  • the metal foam sandwich structure is molded or compacted at least 75%, more preferably at least 95% of the melting temperature of the metal foam core.
  • the sandwich material is heated to a temperature just below the melting point of the foam material.
  • the invention therefore has the subject of a Formgebu ⁇ gs vide that does not have the initially described disadvantages of the prior art and instead a transformation or compaction of subregions or the entire sandwich structure allows without the cell walls of the foam structure are significantly damaged or even completely destroyed.
  • metal foam sandwich structures formed by the shaping method according to the invention do not exhibit the damage known from the prior art. Due to the absence of areas in the foam in which the cell walls of the foam structure are partially or completely destroyed, the sandwich structure substantially retains its strength even after being formed or compacted.
  • Fig. 1 is a partially compacted metal foam sandwich structure, which was compacted according to the prior art, ie cold;
  • FIG. 2 shows an enlarged portion of FIG. 1
  • Fig. 3 shows a partially compacted metal foam sandwich structure which has been compacted according to the present invention, ie hot.
  • FIG. 4 shows an enlarged portion of FIG. 3
  • FIG. 1 and the detailed view in FIG. 2 show a metal foam sandwich structure consisting of a metal foam core 1 and metal-bonded cover layers 2, which are formed by cold forming after the foaming process, in FIG case compacted, that was deformed perpendicular to the top layer surface.
  • a metal foam sandwich structure consisting of a metal foam core 1 and metal-bonded cover layers 2, which are formed by cold forming after the foaming process, in FIG case compacted, that was deformed perpendicular to the top layer surface.
  • cracks 1a have formed inside the foam core 1, in the region of which the cell walls are completely or partially collapsed.
  • the reason for this is the brittleness of the metal foam core, or to name the cell walls, which have exhibited only insufficient plastic deformability during the forming process.
  • In .Extremfall such cracks 1a already during the forming process lead to failure of the entire sandwich structure. If this is not the case, they lead at least in use to a considerable reduction in the strength of the sandwich structure.
  • areas 2b have been formed in which the foam cells that are almost spherical before forming have been flattened and the cell walls have been folded like a lamella, so that the cells in some areas have almost completely disappeared.
  • the cause of the changed deformation behavior of the foam core in the hot-forming process compared to the cold-forming process is primarily to name the fact that the heating of the foam core, this behaves much more plastic than in the cold state.
  • the process is therefore carried out at process temperatures which are above 95% but below 100% of the melting temperature of the core material. It is obvious that the failure of the cracks 1a substantially maintains the strength of the foam core after the hot-forming process.

Abstract

The invention relates to a method for shaping or forming metal foam sandwich structures comprising at least one core layer consisting of a metal foam (1) and at least one covering layer (2) which is metallically connected to the core layer. According to said method, the shaping or forming is carried out at a temperature which is higher than the ambient temperature and lower than the melting temperature of the metal foam core. The invention also relates to metal foam sandwich structures that can be produced using said method.

Description

METALLSCHAUM-SANDWICHS UND VERFAHREN ZU DEREN METAL FOAM SANDWICH AND METHOD FOR THIS
FORMGEBUNGSHAPING
Seit geraumer Zeit sind so genannte Metallschäume als Leichtbaustrukturen Gegenstand der Forschung und teilweise bereits in der technischen Anwendung.For some time, so-called metal foams as lightweight structures have been the subject of research and some already in technical application.
Als besonders interessant haben sich im Sinne des Leichtbaus Metallschaum-Sandwichs erwiesen, die meist 3-lagig aus einem Metallschaumkern und diesen nach außen abschließenden Decklagen aufgebaut sind. Ist es prinzipiell möglich, derartige Sandwich- Strukturen durch Verkleben der Decklagen mit der Schaumkernschicht herzustellen, so haben sich doch andere Herstellungsverfahren etabliert, in denen das unaufgeschäumte Kernmaterial mit den Decklagen etwa mittels Walzens metallisch, ähnlich dem Walzplatieren, verbunden wird. Derartige Herstellungsverfahren sind beispielsweise aus der EP 0 997 215 A2 oder EP 1 000 690 A2 bekannt.In the sense of lightweight construction, metal foam sandwiches have proven to be particularly interesting, which are usually built up in three layers from a metal foam core and these outer layers closing off to the outside. If it is in principle possible to produce such sandwich structures by gluing the cover layers to the foam core layer, then other production methods have become established in which the unfoamed core material is bonded to the cover layers, for example by means of rolling metallic, similar to roll plating. Such production processes are known, for example, from EP 0 997 215 A2 or EP 1 000 690 A2.
Die Kernschicht des so entstandenen Halbzeugs wird erst anschließend in einem Aufheizprozess mittels eines in der Kernschicht enthaltenen und thermisch aktivierbaren Treibmittels aufgeschäumt, wobei die metallische Anbindung des Kerns an die Decklagen erhalten bleibt. Die so entstandene Metallschaum-Sandwichstruktur ist völlig frei von irgendwelchen Klebstoffen und somit unterhalb der Schmelztemperatur des Metalls temperaturresistent, so dass im Gegensatz zu verklebten Sandwichstrukturen auch Wärme erzeugende Verbindungstechniken wie etwa Schweißen zum Einsatz kommen können.The core layer of the resulting semi-finished product is then foamed in a heating process by means of a contained in the core layer and thermally activated blowing agent, wherein the metallic connection of the core is maintained at the cover layers. The resulting metal foam sandwich structure is completely free of any adhesives and thus temperature-resistant below the melting temperature of the metal, so that in contrast to bonded sandwich structures and heat-generating bonding techniques such as welding can be used.
Von hohem Interesse sind derartige Metallschaum-Sandwichstrukturen ferner, da aus der Blechumarbeitung bekannte Formgebungsverfahren eingesetzt werden können, um entweder das unaufgeschäumte Halbzeug, oder aber auch das aufgeschäumte Sandwichmaterial umzuformen. Auf diese Weise ist es im Gegensatz zu den meisten anderen Sandwichmaterialien möglich, komplexe, 3-dimensionale Geometrien zu erzeugen.Such metal foam sandwich structures are also of great interest because shaping processes known from sheet metal transformation can be used to reform either the unfoamed semi-finished product or else the foamed sandwich material. In this way, unlike most other sandwich materials, it is possible to create complex, 3-dimensional geometries.
Des Weiteren ist es durch entsprechende Werkzeuge möglich, Bereiche der aufgeschäumten Sandwichstruktur derart zu verpressen, dass in diesem Bereich der Schaumkern teilweise oder komplett kompaktiert ist. Auf diese Weise können die Ränder von Metallschaum-Sandwichstrukturen, die ansonsten die offene Schaumstruktur zeigen, verschlossen werden, oder aber funktionsspezifische Dickenunterschiede in Bereichen der Sandwichplatte realisiert werden. Als Beispiel sei hier auf die EP 0 927 589 A2 verwiesen.Furthermore, it is possible by appropriate tools to press areas of the foamed sandwich structure such that in this area the foam core is partially or completely compacted. In this way, the edges of metal foam sandwich structures that otherwise show the open foam structure can be closed, or function-specific differences in thickness in areas of the sandwich panel can be realized. As an example, reference should be made to EP 0 927 589 A2.
Sowohl bei Formgebungsverfahren am aufgeschäumten Sandwich, als auch beim Kompaktieren von Teilbereichen oder auch der gesamten Sandwichstruktur hat man bisher in Kauf genommen, dass in diesen Bereichen die Zellwände der Schaumstruktur erheblich geschädigt, wenn nicht vollends zerstört wurden. Derartige Schädigungen beeinträchtigen den Verbund des Sandwichs im geschädigten Bereich erheblich und setzen damit die Festigkeit entsprechend herab.Both in shaping the foamed sandwich, as well as in the compacting of sub-areas or the entire sandwich structure has been taken into account that in these areas, the cell walls of the foam structure significantly damaged, if not completely destroyed. Such damage significantly affects the composite of the sandwich in the damaged area and thus reduce the strength accordingly.
Die vorliegende Erfindung möchte diesem Nachteil entgegenwirken.The present invention seeks to counteract this disadvantage.
Sie erreicht dieses Ziel durch die Gegenstände des Anspruchs 1 und des Anspruchs 4; also durch ein Verfahren zur Formgebung oder Umformung von Metallschaum- Sandwichstrukturen die mindestens eine Kernschicht aus einem Metallschaum und mindestens eine an diesen metallisch angebundene Decklage aufweisen, wobei die Formgebung oder Umformung bei einer Temperatur stattfindet, die höher als die Umgebungstemperatur und tiefer als die Schmelztemperatur des Metallschaumkems ist; sowie auch durch eine geformte oder kompaktierte Metallschaum-Sandwichstruktur mit einem Metallschaumkern und mindestens einer an diesen metallisch angebundenen Decklage, wobei die Metallschaum-Sandwichstruktur mittels des vorstehend angegebenen erfindungsgemäßen Verfahrens herstellbar ist, insbesondere hergestellt worden ist.It achieves this goal by the subject matters of claim 1 and claim 4; Thus, by a method for shaping or forming of metal foam sandwich structures having at least one core layer of a metal foam and at least one metallically bonded thereto cover layer, wherein the shaping or forming takes place at a temperature higher than the ambient temperature and lower than the melting temperature of Metallschaumkems is; as well as by a molded or compacted metal foam sandwich structure with a metal foam core and at least one metallically bonded to this cover layer, wherein the metal foam sandwich structure can be produced by means of the above-mentioned inventive method, in particular.
Erfindungsgemäß wird also das Sandwichmaterial vor dem Umformen bzw. Kompaktieren auf eine Temperatur über der Umgebungstemperatur - aber unterhalb der Schmelztemperatur des Metallschaumkerns - erhitzt.According to the invention, therefore, the sandwich material before forming or compacting to a temperature above the ambient temperature - but below the melting temperature of the metal foam core - heated.
Als Folge dieser Erwärmung sinken einerseits die Festigkeit, und damit der Widerstand des Materials gegen die Umformung, sodass geringere Umformkräfte vonnöten sind, andererseits verhält sich das Material während des Umformungs- oder Kompaktierungsprozesses erheblich plastischer, also weniger spröde.As a result of this warming, on the one hand, the strength decreases, and thus the resistance of the material to the forming, so that lower forming forces are required, on the other hand, the material behaves during the forming or Kompaktierungsprozesses considerably more plastic, so less brittle.
Im Gegensatz zum Umformen oder Kompaktieren des kalten Materials verformen sich die Zellwände während des Prozesses ohne größere Schädigungen davonzutragen. Die Schaumstruktur bleibt also ebenso wie der Verbund intakt. Der Metallschaumkern weist als Folge der erfindungsgemäßen Einwirkung auf die Metallschaum-Sandwichstruktur mindestens einen Bereich auf, in dem die Schaumzellen teilweise abgeflacht und die Zellwände lamellenartig eingefaltet sind. Als Schaumkern eignet sich besonders ein Aluminiumschaum.In contrast to forming or compacting the cold material, the cell walls deform during the process without suffering any major damage. The foam structure remains as well as the composite intact. The metal foam core has as a result of the action according to the invention on the metal foam sandwich structure at least one area in which the foam cells are partially flattened and the cell walls are folded like a lamella. Foam core is particularly suitable aluminum foam.
Bevorzugt wird die Metallschaum-Sandwichstruktur bei mindestens 75 %, besonders bevorzugt bei mindestens 95 % der Schmelztemperatur des Metallschaumkerns, geformt oder kompaktiert. In ganz besonders bevorzugter Weise wird das Sandwichmaterial auf eine Temperatur unmittelbar unterhalb des Schmelzpunkts des Schaummaterials erhitzt.Preferably, the metal foam sandwich structure is molded or compacted at least 75%, more preferably at least 95% of the melting temperature of the metal foam core. Most preferably, the sandwich material is heated to a temperature just below the melting point of the foam material.
Die Erfindung hat also zum Gegenstand ein Formgebuπgsverfahren, das die eingangs geschilderten Nachteile des Standes der Technik nicht aufweist und stattdessen eine Umformung oder Kompaktierung von Teilbereichen oder auch der gesamten Sandwichstruktur zulässt ohne dass die Zellwände der Schaumstruktur erheblich geschädigt oder gar vollends zerstört werden.The invention therefore has the subject of a Formgebuπgsverfahren that does not have the initially described disadvantages of the prior art and instead a transformation or compaction of subregions or the entire sandwich structure allows without the cell walls of the foam structure are significantly damaged or even completely destroyed.
Mittels des erfindungsgemäßen Formgebungsverfahrens umgeformte Metallschaum- Sandwichstrukturen, bzw. teilweise oder ganz kompaktierte Metallschaum- Sandwichstrukturen mit metallisch verbundenen Kern- und Decklagen, weisen also die aus dem Stand der Technik bekannten Schädigungen nicht auf. Durch das Nichtvorhandensein von Bereichen im Schaum, in denen die Zellwände der Schaumstruktur teilweise oder vollends zerstört sind, behält die Sandwichstruktur auch nach dem Umformen bzw. Kompaktieren im Wesentlichen ihre Festigkeit.Thus, metal foam sandwich structures formed by the shaping method according to the invention, or partially or completely compacted metal foam sandwich structures with metallically bonded core and cover layers, do not exhibit the damage known from the prior art. Due to the absence of areas in the foam in which the cell walls of the foam structure are partially or completely destroyed, the sandwich structure substantially retains its strength even after being formed or compacted.
Die vorliegende Erfindung soll anhand der folgenden Abbildungen weiter erläutert werden. Es zeigenThe present invention will be further explained with reference to the following figures. Show it
Fig. 1 eine teilkompaktierte Metallschaum-Sandwichstruktur, die nach dem Stand der Technik, also kalt, kompaktiert wurde;Fig. 1 is a partially compacted metal foam sandwich structure, which was compacted according to the prior art, ie cold;
Fig. 2 einen vergrößerten Teilbereich aus Fig. 12 shows an enlarged portion of FIG. 1
Fig. 3 eine teilkompaktierte Metallschaum-Sandwichstruktur, die entsprechend der vorliegenden Erfindung, also heiß, kompaktiert wurde.Fig. 3 shows a partially compacted metal foam sandwich structure which has been compacted according to the present invention, ie hot.
Fig. 4 einen vergrößerten Teilbereich aus Fig. 34 shows an enlarged portion of FIG. 3
Figur 1 und die Detailansicht in Figur 2 zeigen eine Metallschaum-Sandwichstruktur bestehend aus einem Metallschaumkern 1 und an diesen metallisch angebundenen Decklagen 2, die nach dem Aufschäumprozess mittels Kaltverformen umgeformt, im dargestellten Fall kompaktiert, also senkrecht zur Decklagenoberfläche verformt wurde. Als Folge dieses Kaltverformungsprozesses haben sich im Innern des Schaumkerns 1 Risse 1a gebildet, in deren Bereich die Zellwände ganz oder teilweise kollabiert sind. Als Ursache hierfür ist die Sprödigkeit des Metallschaumkerns, bzw. der Zellwände zu nennen, die beim Umformprozess nur eine ungenügend plastische Verformbarkeit aufgewiesen haben. Im .Extremfall können derartige Risse 1a bereits während des Umformprozesses zum Versagen der gesamten Sandwichstruktur führen. Ist dies nicht der Fall, so führen sie zumindest im Einsatz zu einer erheblichen Festigkeitsreduzierung der Sandwichstruktur.FIG. 1 and the detailed view in FIG. 2 show a metal foam sandwich structure consisting of a metal foam core 1 and metal-bonded cover layers 2, which are formed by cold forming after the foaming process, in FIG case compacted, that was deformed perpendicular to the top layer surface. As a consequence of this cold-forming process, cracks 1a have formed inside the foam core 1, in the region of which the cell walls are completely or partially collapsed. The reason for this is the brittleness of the metal foam core, or to name the cell walls, which have exhibited only insufficient plastic deformability during the forming process. In .Extremfall such cracks 1a already during the forming process lead to failure of the entire sandwich structure. If this is not the case, they lead at least in use to a considerable reduction in the strength of the sandwich structure.
Im Gegensatz hierzu wurden die Metallschaum-Sandwichstrukturen in Figur 3 und der Detailansicht in Figur 4 vor dem Kompaktieren auf eine Temperatur nur wenig unterhalb des Schmelzpunktes des Schaummaterials aufgeheizt und anschließend umgeformt. Wie insbesondere aus der Detailansicht deutlich wird, ist es hier nicht zu der aus Figur 1 und Figur 2 bekannten Rissbildung gekommen.In contrast, the metal foam sandwich structures in Figure 3 and the detail view in Figure 4 were heated to a temperature only slightly below the melting point of the foam material prior to compaction and then reshaped. As is clear in particular from the detail view, it has not come here to the known from Figure 1 and Figure 2 cracking.
Stattdessen haben sich hier Bereiche 2b ausgebildet, in denen die vor der Umformung nahezu sphärischen Schaumzellen stark abgeflacht und die Zellwände lamellenartig eingefaltet wurden, so dass die Zellen in diese Bereichen teilweise fast komplett verschwunden sind.Instead, areas 2b have been formed in which the foam cells that are almost spherical before forming have been flattened and the cell walls have been folded like a lamella, so that the cells in some areas have almost completely disappeared.
Als Ursache für das veränderte Umform verhalten des Schaumkerns im Warmverformungsprozess gegenüber dem Kaltverformungsprozess ist primär die Tatsache zu benennen, dass durch das Aufheizen des Schaumkerns sich dieser wesentlich plastischer verhält als im kalten Zustand.The cause of the changed deformation behavior of the foam core in the hot-forming process compared to the cold-forming process is primarily to name the fact that the heating of the foam core, this behaves much more plastic than in the cold state.
In der Praxis haben sich hierbei bereits Temperaturen bewährt, die ca. 75 % der Schmelztemperatur des Schaumkerns erreichen. Bei einer Schmelztemperatur der Kernlegierung von ca. 800 K (= 527 0C) entspricht dies einer Prozesstemperatur von 600 K (=327 0C).In practice, temperatures have already proven that reach about 75% of the melting temperature of the foam core. At a melting temperature of the core alloy of about 800 K (= 527 0 C), this corresponds to a process temperature of 600 K (= 327 0 C).
Besonders gute Ergebnisse werden erreicht, wenn der Metallschaumkem auf eine Temperatur nur wenig unterhalb seiner Schmelztemperatur aufgeheizt wird.Particularly good results are achieved when the metal foam core is heated to a temperature only slightly below its melting temperature.
In besonders bevorzugter Ausführungsform wird das Verfahren daher bei Prozesstemperaturen durchgeführt, die oberhalb 95 % aber unterhalb 100 % der Schmelztemperatur des Kernmaterials liegen. Es ist offensichtlich, dass durch das Ausbleiben der Risse 1a die Festigkeit des Schaumkerns nach dem Heißverformungsprozess im Wesentlichen erhalten bleibt. In a particularly preferred embodiment, the process is therefore carried out at process temperatures which are above 95% but below 100% of the melting temperature of the core material. It is obvious that the failure of the cracks 1a substantially maintains the strength of the foam core after the hot-forming process.

Claims

Ansprüche: Claims:
1. Verfahren zur Formgebung oder Umformung von Metallschaum-Sandwichstrukturen, die mindestens eine Kernschicht aus einem Metallschaum (1) und mindestens eine an diesen metallisch angebundene Decklage (2) aufweisen, dadurch gekennzeichnet dass die Formgebung oder Umformung bei einer Temperatur stattfindet, die höher als die Umgebungstemperatur und tiefer als die Schmelztemperatur des Metallschaumkerns ist.1. A method for shaping or forming of metal foam sandwich structures having at least one core layer of a metal foam (1) and at least one metallically bonded thereto cover layer (2), characterized in that the shaping or forming takes place at a temperature higher than the ambient temperature and lower than the melting temperature of the metal foam core.
2. Verfahren zur Formgebung oder Umformung nach Anspruch 1 , dadurch gekennzeichnet, dass die Temperatur mindestens 75 % der Schmelztemperatur des Metallschaumkerns (1) erreicht.2. A method of shaping or forming according to claim 1, characterized in that the temperature reaches at least 75% of the melting temperature of the metal foam core (1).
3. Verfahren zur Formgebung oder Umformung nach Anspruch 1 , dadurch gekennzeichnet, dass die Temperatur mindestens 95 % der Schmelztemperatur des Metallschaumkerns (1) erreicht.3. A method of shaping or forming according to claim 1, characterized in that the temperature reaches at least 95% of the melting temperature of the metal foam core (1).
4. Geformte oder kompaktierte Metallschaum-Sandwichstruktur mit einem Metallschaumkern (1) und mindestens einer an diesen metallisch angebundenen Decklage (2), dadurch gekennzeichnet, dass sie mittels eines Verfahrens nach einem der vorstehenden Ansprüche herstellbar ist, insbesondere hergestellt worden ist.4. Shaped or compacted metal foam sandwich structure with a metal foam core (1) and at least one metallically bonded to this cover layer (2), characterized in that it can be produced by a method according to any one of the preceding claims, in particular.
5. Metallschaum-Sandwichstruktur nach Anspruch 4, dadurch gekennzeichnet, dass der Metallschaumkem (1) einen oder mehrere Bereiche (1 b) aufweist, in denen die Schaumzellen teilweise abgeflacht und die Zellwände lamellenartig eingefaltet sind.5. Metal foam sandwich structure according to claim 4, characterized in that the metal foam core (1) has one or more areas (1 b), in which the foam cells are partially flattened and the cell walls are folded lamellar.
6. Metallschaum-Sandwichstruktur nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass es sich bei dem Schaumkern (1) um einen Aluminiumschaum handelt.6. metal foam sandwich structure according to claim 4 or 5, characterized in that it is the foam core (1) is an aluminum foam.
7. Metallschaum-Sandwichstruktur nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass es sich um eine ganz oder teilweise verpresste Struktur handelt. 7. Metal foam sandwich structure according to one of claims 4 to 6, characterized in that it is a completely or partially compressed structure.
PCT/EP2006/003524 2005-04-18 2006-04-18 Metal foam sandwich structures and method for shaping the same WO2006111349A1 (en)

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DE202005006240U DE202005006240U1 (en) 2005-04-18 2005-04-18 Metal sandwich structure to be used for creation of three-dimensional shapes, produced by heating metal foam while being compressed
DE202005006240.5 2005-04-18

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PCT/EP2006/003524 WO2006111349A1 (en) 2005-04-18 2006-04-18 Metal foam sandwich structures and method for shaping the same

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CN106862572A (en) * 2017-01-24 2017-06-20 东莞市佳乾新材料科技有限公司 A kind of antiknock aluminium foam sandwich plate for building and preparation method thereof
KR20220162364A (en) 2021-06-01 2022-12-08 부산대학교 산학협력단 Novel squaramide derivatives and use thereof

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DE202013103272U1 (en) 2013-07-22 2014-10-23 Wegener International Gmbh Heating device for the plasticization of workpieces made of a thermoplastic material

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AT406350B (en) * 1993-07-29 2000-04-25 Fraunhofer Ges Forschung Porous metallic material with anisotropic properties
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106862572A (en) * 2017-01-24 2017-06-20 东莞市佳乾新材料科技有限公司 A kind of antiknock aluminium foam sandwich plate for building and preparation method thereof
KR20220162364A (en) 2021-06-01 2022-12-08 부산대학교 산학협력단 Novel squaramide derivatives and use thereof
KR20220162680A (en) 2021-06-01 2022-12-08 부산대학교 산학협력단 Novel squaramide derivatives and use thereof

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