EP1149233B2 - Method of producing a sound-absorbent insulating element and insulating element produced according to this method - Google Patents

Method of producing a sound-absorbent insulating element and insulating element produced according to this method Download PDF

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Publication number
EP1149233B2
EP1149233B2 EP00901030A EP00901030A EP1149233B2 EP 1149233 B2 EP1149233 B2 EP 1149233B2 EP 00901030 A EP00901030 A EP 00901030A EP 00901030 A EP00901030 A EP 00901030A EP 1149233 B2 EP1149233 B2 EP 1149233B2
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Prior art keywords
sheets
sheet
heat shield
metallic
sound
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EP00901030A
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German (de)
French (fr)
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EP1149233B1 (en
EP1149233A1 (en
Inventor
Evelyn Zwick
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Autoneum International AG
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Rieter Automotive International AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making
    • 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
    • Y10T428/12361—All metal or with adjacent metals having aperture or cut
    • 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
    • Y10T428/1241—Nonplanar uniform thickness or nonlinear uniform diameter [e.g., L-shape]
    • Y10T428/12417—Intersecting corrugating or dimples not in a single line [e.g., waffle form, 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
    • Y10T428/12479—Porous [e.g., foamed, spongy, cracked, etc.]

Definitions

  • the present invention relates to a method for producing an insulating part according to the preamble of claim 1, and to an insulating part produced therewith according to the preamble of claim 6.
  • Such insulation parts are preferably used in the automotive sector, where they are used, for example, between the hotter catalyst and the vehicle floor.
  • the WO 91/10560 describes a heat shield with a foil package which comprises heat-conducting zones, so-called heat sinks, and heat-insulating zones.
  • the individual films of the film package have impressions or nubs, which cause the stacked films are spaced apart.
  • the individual films can be hermetically sealed together, thus enabling the inclusion of a gas, eg xenon.
  • the individual films are perforated to improve the acoustic effectiveness.
  • the edge regions of these film packages are compressed in practice without significant pressure force, cut and then crimped, heat-sealed or mechanically connected.
  • an insulating part which comprises a stack of a plurality of thin metallic sheets, between which sheets a metallic knitted fabric or an expanded metal-like spacer is used.
  • acoustic effectiveness of these foil packages depends essentially on the perforation, the choice of material and the mutual distance of the individual foils.
  • suitable films preferably of aluminum, are guided via corresponding spiked rollers and / or nubbed rollers.
  • a desired by the acoustic professional change the knobbly shape or density, the perforation density or the size of the individual perforations, makes costly tool changes required.
  • this method the perforation density and the air flow resistance generated by such a perforation can be changed in a simple and cost-effective manner.
  • This object is achieved according to the invention by a method having the features of claim 1, and in particular by a method for producing a sound-absorbing insulating part with at least two metallic sheets, which may have the form of a film or a thin sheet.
  • the material of at least one metallic sheet is knopped in a method step and in a further method step this knotted sheet is connected to at least one second metallic sheet.
  • the elastic limit of the sheet material is exceeded in such a way that hairline cracks resp. Form fissures.
  • thin sheets can be fissured just as well as thick foil, or sheets in the form of expanded metal used. Furthermore, it is particularly advantageous if aluminum is used as the material for these sheets.
  • a particularly preferred embodiment of the inventive method provides that the individual metallic layers, in particular films resp. Leaves to be cold-welded together.
  • Cold welding is understood in the following to mean a metallurgical bond which comes about through a plastic deformation of two or more adjacent foils or sheets, in which deformation the metallic material of adjacent sheets cohesively bonds.
  • a connection can be achieved if adjacent metal sheets are compressed, for example, by about 75%.
  • an object of the invention to provide an insulating part, in particular a heat shield with improved and easily optimizable acoustic effectiveness.
  • a sound-absorbing insulating part with the features of claim 6, and in particular by a sound-absorbing heat shield, which comprises at least two metallic sheets, wherein the at least one metallic sheet has a plurality of nubs and / or fissures and with the at least second Sheet is connected and deformed into a molded insulating part. It is of particular advantage if these metallic blades are made of aluminum.
  • the inventive method proves to be surprisingly simple and leads to sound-absorbing insulation parts with a surprisingly good sound absorption.
  • a sheet-like metal foil 12 is drawn off continuously from a roll 13 and passed through a roll device 14 for nip.
  • This roller device 14 essentially comprises a nub roller 15 and a counter-roller 16, which can be coated with an elastic material or with a mesh-like structure cooperating with the nub roller 15.
  • This counter-roller 16 presses the film 12 against the nubs of the nub roller 15.
  • the nubs of the nub roller 15 and the counter-roller 16 are matched to one another such that the film 12 partially ruptures in the nip in this roller device 14.
  • the brittleness or elasticity of the sheet material to be nipped also plays a role here.
  • the thus fissured sheet 13 is then cut 19 in a known manner and stacked 20. It is understood that this method can also be designed discontinuously and the roller device 14 can be replaced by suitable press plates.
  • the fissured sheets are combined with similar or other metallic sheets and shaped in a known manner and fastened to one another.
  • the elastic limit of the metallic material of the film 12 is thus exceeded during napping in the roller device 14 such that a multiplicity of irregularly arranged fissures 4, 11 are formed.
  • these fissures 4 compared to needled perforations, the acoustic energy dissipate better and thus sound-absorbing insulation parts, in particular heat shields can be produced with improved acoustic efficiency.
  • the air flow resistance on the surface of an acoustically effective insulating part can be varied in a simple manner and adjusted so that optimum sound dissipation can be achieved for any arbitrarily shaped insulating part. This optimization or adjustment is carried out according to the invention on the number, density and length of the fissures.
  • fissures 4, 11 with different lengths can be formed.
  • a high fissure density can be achieved with shorter fissures 4 (which occur, for example, at locations of maximum drawstring, ie at the nub points 10), and a lower fissure density can be produced with longer fissures 11 extending over two or more nubs 5 ,
  • the material of the web 12 is cut into predetermined parts and stacked.
  • at least a first sheet fissured in the above manner and a second metallic sheet are superimposed and joined together by flanging, stapling, gluing or cold welding.
  • the second metallic sheet used may be a film or a sheet which may be imperforate or perforated, in particular fissured, which may be studded, ribbed or undeformed, which may be more or less rigid, have different thicknesses or in the form of an expanded metal can be used.
  • cold welding is understood to mean a metallurgical connection which results from a plastic deformation of two or more adjacent blades, in which deformation the metallic material of adjacent blades bonds in a material-locking manner.
  • a connection can be achieved if, for example, the material is compressed by about 75%.
  • the manufacturing method disclosed herein can be further automated by, for example, simultaneously withdrawing the various sheets from different rolls or stacks and then cut, shaped and / or cold-welded together.
  • FIG. 2 shows two fissured and stacked sheets 2, 3 according to the invention. These sheets have a plurality of nubs 5, which ensure that the two sheets 2, 3 are spaced from each other.
  • the fissures 4, 11 produced in the production method according to the invention lie essentially in the area of the studded crest 10, since, in the case of knobs, the stretching of the material occurs most pronounced in this area and according to the invention the elastic limit of the material is exceeded. It is understood that the number and length of the individual fissures 4, 11 can be varied by the choice of the sheet material.
  • knobs 5 are hemispherical, frustoconical, pyramidal, cuboidal or cylindrical bulges form and select their density, arrangement and size in the desired manner.
  • the inventive isolation parts have at least two leaves 2, 3, of which at least one according to the invention is fissured.
  • These sheets 2, 3 are preferably made of aluminum and may be unperforated or perforated, in particular fissured, studded, ribbed or undeformed, more or less rigid, have different thicknesses or be in the form of an expanded metal.
  • these sheets can be supplemented with carrier plates of known type or with metallic insulating fabrics, nonwovens.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Isolationsteils gemäss Oberbegriff des Anspruchs 1, sowie ein damit hergestelltes Isolationsteil gemäss Oberbegriff des Anspruchs 6.The present invention relates to a method for producing an insulating part according to the preamble of claim 1, and to an insulating part produced therewith according to the preamble of claim 6.

Derartige Isolationsteile finden ihre Verwendung vorzugsweise im Automobilbereich und werden dort beispielsweise zwischen den heiss werdenden Katalysator und dem Fahrzeugboden eingesetzt.Such insulation parts are preferably used in the automotive sector, where they are used, for example, between the hotter catalyst and the vehicle floor.

Derartige Isolationsteile sind bekannt und beispielsweise in der PCT-Anmeldung WO 91/10560 oder US 5,424,139 beschrieben. Die WO 91/10560 beschreibt ein Hitzeschild mit einem Folienpaket, welches wärmeleitende Zonen, sogenannte Wärmesenken, und wärmeisolierende Zonen umfasst. Insbesondere weisen die einzelnen Folien des Folienpakets Einprägungen oder Noppen auf, die dazu führen, dass die gestapelten Folien voneinander beabstandet sind. Die einzelnen Folien können hermetisch dicht miteinander verbunden sein, womit der Einschluss eines Gases, z.B. Xenon, ermöglicht wird. In einer Weiterbildung dieses bekannten Hitzeschildes sind, zur Verbesserung der akustischen Wirksamkeit, die einzelnen Folien perforiert. Die Randbereiche dieser Folienpakete werden in der Praxis ohne wesentliche Druckkraft zusammengedrückt, geschnitten und anschliessend gebördelt, heissversiegelt oder mechanisch verbunden.Such isolation parts are known and, for example, in the PCT application WO 91/10560 or US 5,424,139 described. The WO 91/10560 describes a heat shield with a foil package which comprises heat-conducting zones, so-called heat sinks, and heat-insulating zones. In particular, the individual films of the film package have impressions or nubs, which cause the stacked films are spaced apart. The individual films can be hermetically sealed together, thus enabling the inclusion of a gas, eg xenon. In a development of this known heat shield, the individual films are perforated to improve the acoustic effectiveness. The edge regions of these film packages are compressed in practice without significant pressure force, cut and then crimped, heat-sealed or mechanically connected.

Mit der US 5,424,139 wird ein Isolationsteil offenbart, welches einen Stapel aus mehreren dünnen metallischen Blättern umfasst, zwischen welche Blätter ein metallisches Gewirke respektive ein streckmetallartiger Abstandshalter eingesetzt ist.With the US 5,424,139 an insulating part is disclosed, which comprises a stack of a plurality of thin metallic sheets, between which sheets a metallic knitted fabric or an expanded metal-like spacer is used.

Es erweist sich, dass die akustische Wirksamkeit dieser Folienpakete wesentlich von der Perforation, der Materialwahl und dem gegenseitigen Abstand der einzelnen Folien abhängt. Um diese Parameter in gewünschter Weise wählen zu können, werden geeignete Folien, vorzugsweise aus Aluminium, über entsprechende Stachelwalzen und/oder Noppenwalzen geführt. Eine vom Akustik-Fachmann gewünschte Änderung der Noppenform oder -dichte, der Perforationsdichte oder der Grösse der einzelnen Perforationen, macht aufwendige Werkzeugänderungen erforderlich.It turns out that the acoustic effectiveness of these foil packages depends essentially on the perforation, the choice of material and the mutual distance of the individual foils. In order to be able to select these parameters in the desired manner, suitable films, preferably of aluminum, are guided via corresponding spiked rollers and / or nubbed rollers. A desired by the acoustic professional change the knobbly shape or density, the perforation density or the size of the individual perforations, makes costly tool changes required.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung eines schallabsorbierenden Isolationsteils, insbesondere eines schallabsorbierenden Hitzeschildes zu schaffen, welches erlaubt, diese in wenigen Verfahrensschritten herzustellen und Anpassungen resp. Änderungen der Folienparameter in einfacher Weise vorzunehmen. Insbesondere soll mit diesem Verfahren die Perforationsdichte und der durch eine solche Perforation erzeugte Luftströmungswiderstand in einfacher und kostengünstiger Weise geändert werden können.It is therefore an object of the present invention to provide a method for producing a sound-absorbing insulating part, in particular a sound-absorbing heat shield, which allows to produce these in a few process steps and adjustments resp. Make changes to the film parameters in a simple manner. In particular, with this method, the perforation density and the air flow resistance generated by such a perforation can be changed in a simple and cost-effective manner.

Diese Aufgabe wird erfindungsgemäss durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst, und insbesondere durch ein Verfahren zur Herstellung eines schallabsorbierenden Isolationsteils mit mindestens zwei metallischen Blättern, welche die Form einer Folie oder eines dünnen Blechs aufweisen können. Bei diesem Verfahren wird in einem Verfahrensschritt das Material mindestens eines metallischen Blattes genoppt und in einem weiteren Verfahrensschritt dieses genoppte Blatt mit mindestens einem zweiten metallischen Blatt verbunden. Beim Noppen des mindestens einen metallischen Blattes wird die Elastizitätsgrenze des Blattmaterials derart überschritten, dass sich Haarrisse resp. Fissuren bilden. Bei diesem erfindungsgemässen Verfahren können dünne Bleche ebensogut wie dicke Folie fissuriert werden, oder Blätter in Form von Streckmetall verwendet. Des weiteren ist von besonderem Vorteil, wenn Aluminium als Material für diese Blätter verwendet wird.This object is achieved according to the invention by a method having the features of claim 1, and in particular by a method for producing a sound-absorbing insulating part with at least two metallic sheets, which may have the form of a film or a thin sheet. In this method, the material of at least one metallic sheet is knopped in a method step and in a further method step this knotted sheet is connected to at least one second metallic sheet. When napping the at least one metallic sheet, the elastic limit of the sheet material is exceeded in such a way that hairline cracks resp. Form fissures. In this method according to the invention thin sheets can be fissured just as well as thick foil, or sheets in the form of expanded metal used. Furthermore, it is particularly advantageous if aluminum is used as the material for these sheets.

Eine besonders bevorzugte Ausgestaltung des erfindungsgemässen Verfahrens sieht vor, dass die einzelnen metallischen Lagen, insbesondere Folien resp. Blätter, miteinander kaltverschweisst werden. Unter Kaltverschweissen wird im folgenden eine metallurgische Verbindung verstanden, die durch eine plastische Verformung von zwei oder mehr benachbarten Folien, beziehungsweise Blättern, zustande kommt, bei welcher Verformung sich das metallische Material benachbarter Blätter stoffschlüssig verbindet. Bei Aluminium lässt sich eine derartige Verbindung erzielen, wenn benachbarte Metallblätter beispielsweise um ca. 75% komprimiert werden.A particularly preferred embodiment of the inventive method provides that the individual metallic layers, in particular films resp. Leaves to be cold-welded together. Cold welding is understood in the following to mean a metallurgical bond which comes about through a plastic deformation of two or more adjacent foils or sheets, in which deformation the metallic material of adjacent sheets cohesively bonds. For aluminum, such a connection can be achieved if adjacent metal sheets are compressed, for example, by about 75%.

Darüberhinaus ist es Aufgabe der Erfindung ein Isolationsteil, insbesondere ein Hitzeschild mit verbesserter und in einfacher Weise optimierbarer akustischer Wirksamkeit zu schaffen.Moreover, it is an object of the invention to provide an insulating part, in particular a heat shield with improved and easily optimizable acoustic effectiveness.

Diese Aufgabe wird erfindungsgemäss durch ein schallabsorbierendes Isolationsteil mit den Merkmalen des Anspruchs 6 gelöst, und insbesondere durch ein schallabsorbierendes Hitzeschild, welches mindestens zwei metallische Blätter umfasst, wobei das mindestens eine metallische Blatt eine Vielzahl von Noppen und/oder Fissuren aufweist und mit dem mindestens zweiten Blatt verbunden und zu einem geformten Isolationsteil verformt ist. Es ist von besonderem Vorteil, wenn diese metallischen Blätter aus Aluminium bestehen.This object is achieved according to the invention by a sound-absorbing insulating part with the features of claim 6, and in particular by a sound-absorbing heat shield, which comprises at least two metallic sheets, wherein the at least one metallic sheet has a plurality of nubs and / or fissures and with the at least second Sheet is connected and deformed into a molded insulating part. It is of particular advantage if these metallic blades are made of aluminum.

Das erfindungsgemässe Verfahren erweist sich als überraschend einfach und führt zu schallabsorbierenden Isolationsteilen mit einer überraschend guten Schallabsorption.The inventive method proves to be surprisingly simple and leads to sound-absorbing insulation parts with a surprisingly good sound absorption.

Der obengenannte Erfindungsgegenstand, die Vorteile und Eigenschaften der Erfindung werden im folgenden anhand der Figuren beispielhaft erläutert oder gehen offensichtlich aus der folgenden Beschreibung der bevorzugten Ausführungsform hervor.The above-mentioned subject matter, advantages and characteristics of the invention will be described below by way of example with reference to the figures, or will be apparent from the following description of the preferred embodiment.

Dabei zeigen:

Fig. 1
eine schematische Darstellung des erfindungsgemässen Herstellungsverfahrens;
Fig. 2
eine schematische Darstellung zweier erfindungsgemäss hergestellter und gestapelter Blätter.
Showing:
Fig. 1
a schematic representation of the inventive production process;
Fig. 2
a schematic representation of two according to the invention made and stacked leaves.

Für die Herstellung der erfindungsgemässen Isolationsteile wird in einer bevorzugten Ausführungsform eine bahnförmige Metallfolie 12 von einer Rolle 13 kontinuierlich abgezogen und zur Noppung durch eine Walzenvorrichtung 14 geführt. Diese Walzenvorrichtung 14 umfasst im wesentlichen eine Noppenwalze 15 und eine Gegenwalze 16, welche mit einem elastischen Material ummantelt, oder mit einer, mit der Noppenwalze 15 zusammenwirkenden siebartigen Struktur versehen sein kann. Diese Gegenwalze 16 drückt die Folie 12 gegen die Noppen der Noppenwalze 15. Erfindungsgemäss sind die Noppen der Noppenwalze 15 und die Gegenwalze 16 so aufeinander abgestimmt, dass die Folie 12 bei der Noppung in dieser Walzenvorrichtung 14 partiell aufreisst. Durch einfache Wahl des elastischen Materials des Mantels der Gegenwalze 16 oder durch geeignete Beabstandung der Walzen kann die Anzahl und Grösse der beim Noppen auftretenden Fissuren 4, 11 im Folienmaterial 12 in einfacher Weise beeinflusst werden.For the production of the insulating parts according to the invention, in a preferred embodiment, a sheet-like metal foil 12 is drawn off continuously from a roll 13 and passed through a roll device 14 for nip. This roller device 14 essentially comprises a nub roller 15 and a counter-roller 16, which can be coated with an elastic material or with a mesh-like structure cooperating with the nub roller 15. This counter-roller 16 presses the film 12 against the nubs of the nub roller 15. According to the invention, the nubs of the nub roller 15 and the counter-roller 16 are matched to one another such that the film 12 partially ruptures in the nip in this roller device 14. By a simple choice of the elastic material of the mantle of the mating roll 16 or by suitable spacing of the rolls, the number and size of the fissures 4, 11 occurring during pilling can be influenced in the film material 12 in a simple manner.

Dabei spielt auch die Sprödigkeit respektive Elastizität des zu noppenden Folienmaterials eine Rolle. Die derart fissurierte Folie 13 wird anschliessend in bekannter Weise zugeschnitten 19 und gestapelt 20. Es versteht sich, dass dieses Verfahren auch diskontinuierlich ausgelegt sein kann und die Walzenvorrichtung 14 durch geeignete Pressplatten ersetzt werden kann.The brittleness or elasticity of the sheet material to be nipped also plays a role here. The thus fissured sheet 13 is then cut 19 in a known manner and stacked 20. It is understood that this method can also be designed discontinuously and the roller device 14 can be replaced by suitable press plates.

Zur Herstellung eines erfindungsgemässen Isolationsteils werden die fissurierten Blätter mit gleichartigen oder anderen metallischen Blättern kombiniert und in bekannter Weise geformt und aneinander befestigt.To produce an insulating part according to the invention, the fissured sheets are combined with similar or other metallic sheets and shaped in a known manner and fastened to one another.

Erfindungsgemäss wird also während des Noppens in der Walzenvorrichtung 14 die Elastizitätsgrenze des metallischen Materials der Folie 12 derart überschritten, dass sich eine Vielzahl von unregelmässig angeordneten Fissuren 4, 11 bildet. Es erweist sich als überraschend, dass diese Fissuren 4 im Vergleich zu genadelten Perforationen, die akustische Energie besser dissipieren und sich damit schallabsorbierende Isolationsteile, insbesondere Hitzeschilde mit einer verbesserten akustischen Wirksamkeit herstellen lassen. Darüberhinaus lässt sich mit derartigen fissurierten Folien der Luftströmungswiderstand an der Oberfläche eines akustisch wirksamens Isolationsteils in einfacher Weise variieren und so einstellen, dass für jedes beliebig geformte Isolationsteil eine optimale Schalldissipation erzielt werden kann. Diese Optimierung oder Einstellung erfolgt erfindungsgemäss über die Anzahl, Dichte und Länge der Fissuren.According to the invention, the elastic limit of the metallic material of the film 12 is thus exceeded during napping in the roller device 14 such that a multiplicity of irregularly arranged fissures 4, 11 are formed. It turns out to be surprising that these fissures 4 compared to needled perforations, the acoustic energy dissipate better and thus sound-absorbing insulation parts, in particular heat shields can be produced with improved acoustic efficiency. Moreover, with such fissured foils, the air flow resistance on the surface of an acoustically effective insulating part can be varied in a simple manner and adjusted so that optimum sound dissipation can be achieved for any arbitrarily shaped insulating part. This optimization or adjustment is carried out according to the invention on the number, density and length of the fissures.

Besonders vorteilhaft ist es, wenn ein sprödes und damit leicht reissendes Material verwendet wird, weil sich damit während des Noppens eine gute Fissurenbildung erzielen lässt. Abhängig von der Materialwahl, der Folienstärke bzw. Blechdicke und der Gestaltung der Walzenvorrichtung 14 lassen sich Fissuren 4, 11 mit unterschiedlicher Länge bilden. Dabei kann eine hohe Fissurendichte mit kürzeren Fissuren 4 (welche z.B. an Orten grösster Streckbelastung, d.h. an den Noppenspitzen 10 auftreten), erzielt werden, und lässt sich eine niedrigere Fissurendichte mit längeren Fissuren 11, die sich über zwei oder mehr Noppen 5 erstrecken, erzeugen.It is particularly advantageous if a brittle and thus easily rupturing material is used, because it can be used to achieve good fissuring during pilling. Depending on the choice of material, the film thickness or sheet thickness and the design of the roller device 14, fissures 4, 11 with different lengths can be formed. In this case, a high fissure density can be achieved with shorter fissures 4 (which occur, for example, at locations of maximum drawstring, ie at the nub points 10), and a lower fissure density can be produced with longer fissures 11 extending over two or more nubs 5 ,

Nach dem Noppen wird das Material der Bahn 12 in vorgegebene Teile geschnitten und gestapelt. Für die Herstellung von schallabsorbierenden Isolationsteilen werden in einer einfachsten Ausführungsform mindestens ein erstes, in obiger Weise fissuriertes Blatt und ein zweites metallisches Blatt übereinander gelegt und mittels Bördeln, Heften, Kleben oder Kaltverschweissen miteinander verbunden. Dabei kann als zweites metallisches Blatt eine Folie oder ein Blech verwendet werden, welche unperforiert oder perforiert, insbesondere fissuriert sein können, welche genoppt, gerippt oder unverformt sein können, welche mehr oder weniger steif sein können, verschiedene Dicken aufweisen können oder in Form eines Streckmetalls verwendet werden können.After napping, the material of the web 12 is cut into predetermined parts and stacked. For the production of sound-absorbing insulating parts, in a simplest embodiment, at least a first sheet fissured in the above manner and a second metallic sheet are superimposed and joined together by flanging, stapling, gluing or cold welding. In this case, the second metallic sheet used may be a film or a sheet which may be imperforate or perforated, in particular fissured, which may be studded, ribbed or undeformed, which may be more or less rigid, have different thicknesses or in the form of an expanded metal can be used.

Wie bereits oben erläutert wurde, wird unter Kaltverschweissen eine metallurgische Verbindung verstanden, die durch eine plastische Verformung von zwei oder mehr benachbarten Blättern zustandekommt, bei welcher Verformung sich das metallische Material benachbarter Blätter stoffschlüssig verbindet. Bei Aluminium lässt sich eine derartige Verbindung erzielen, wenn das Material beispielsweise um ca. 75% komprimiert wird.As has already been explained above, cold welding is understood to mean a metallurgical connection which results from a plastic deformation of two or more adjacent blades, in which deformation the metallic material of adjacent blades bonds in a material-locking manner. For aluminum, such a connection can be achieved if, for example, the material is compressed by about 75%.

Es versteht sich, dass das hier aufgezeigte Herstellungsverfahren weiter automatisiert werden kann, indem beispielsweise die verschiedenen Blätter gleichzeitig von unterschiedlichen Rollen oder Stapeln abgezogen werden und dann gemeinsam zugeschnitten, geformt und/oder kaltverschweisst werden.It will be understood that the manufacturing method disclosed herein can be further automated by, for example, simultaneously withdrawing the various sheets from different rolls or stacks and then cut, shaped and / or cold-welded together.

Figur 2 zeigt zwei erfindungsgemäss fissurierte und gestapelte Blätter 2, 3. Diese Blätter weisen eine Vielzahl von Noppen 5 auf, welche sicherstellen, dass die beiden Blätter 2, 3 voneinander beabstandet sind. Die bei dem erfindungsgemässen Herstellungsverfahren erzeugten Fissuren 4, 11 liegen im wesentlichen im Bereich des Noppenkamms 10, da, beim Noppen, in diesem Bereich die Streckung des Materials am ausgeprägtesten auftritt und erfindungsgemäss die Elastizitätsgrenze des Materials überschritten wird. Es versteht sich, dass durch die Wahl des Blattmaterials die Anzahl und Länge der einzelnen Fissuren 4, 11 variiert werden kann. Ebenso ist der Fachmann frei, die besondere Form der Noppen in geeigneter Weise zu gestalten, d.h. die einzelnen Noppen 5 als halbkugelförmige, kegelstumpfförmige, pyramidale, quaderförmige oder zylindrische Auswölbungen auszubilden und deren Dichte, Anordnung und Grösse in gewünschter Weise auszuwählen. FIG. 2 shows two fissured and stacked sheets 2, 3 according to the invention. These sheets have a plurality of nubs 5, which ensure that the two sheets 2, 3 are spaced from each other. The fissures 4, 11 produced in the production method according to the invention lie essentially in the area of the studded crest 10, since, in the case of knobs, the stretching of the material occurs most pronounced in this area and according to the invention the elastic limit of the material is exceeded. It is understood that the number and length of the individual fissures 4, 11 can be varied by the choice of the sheet material. Likewise, the skilled person is free to make the particular shape of the knobs in a suitable manner, ie the individual knobs 5 as hemispherical, frustoconical, pyramidal, cuboidal or cylindrical bulges form and select their density, arrangement and size in the desired manner.

Die erfindungsgemässen Isolationsteile weisen mindestens zwei Blätter 2, 3 auf, von denen mindestens eines erfindungsgemäss fissuriert ist. Diese Blätter 2, 3 sind bevorzugterweise aus Aluminium hergestellt und können unperforiert oder perforiert, insbesondere fissuriert sein, genoppt, gerippt oder unverformt, mehr oder weniger steif, verschiedene Dicken aufweisen oder in Form eines Streckmetalls sein. Bei Verwendung dieser Isolationsteile als Hitzeschilde können diese Blätter mit Trägerblechen bekannter Art oder mit metallischen Isolationsgeweben, -vliesen ergänzt sein.The inventive isolation parts have at least two leaves 2, 3, of which at least one according to the invention is fissured. These sheets 2, 3 are preferably made of aluminum and may be unperforated or perforated, in particular fissured, studded, ribbed or undeformed, more or less rigid, have different thicknesses or be in the form of an expanded metal. When using these insulating parts as heat shields, these sheets can be supplemented with carrier plates of known type or with metallic insulating fabrics, nonwovens.

Claims (10)

  1. Method of producing a sound-absorbing heat shield, having at least two metallic sheets in the form of foils or metal sheets, of which at least one is embossed, and said sheets, after being embossed, being joined and formed together, wherein at least one fissured sheet (2) is produced when, during embossing the material of the at least one metallic sheet, the individual knobs are designed as semi-spherical, blunt conical, pyramidal, square or cylindrical protrusions, and this is overstretched to such an extent that fissures (4) are created, irregularly located in the region of the ridge (10) of the knob.
  2. Method according to claim 1, wherein at least one sheet is used in the form of a stretched metal.
  3. Method according to one of claims 1 or 2, wherein, whilst embossing the material of the at least one sheet, blunt conical knobs are created.
  4. Method according to one of claims 1 or 2, wherein aluminium is used as material for the sheets.
  5. Method according to one of claims 1 to 4, wherein the metallic sheets are coldsoldered together at their edge regions.
  6. Sound-absorbing heat shield, produced according to the method according to claim 1, wherein the heat shield comprises at least two metallic sheets in the form of foils or metal sheets of which at least one comprises a plurality of knobs (5), that are designed as semi-spherical, blunt conical, pyramidal, square or cylindrical protrusions and that fissures (4, 11) are created, irregularly located in the region of the ridge (10) of the knob, and which sheets (2, 3) are joined together.
  7. Heat shield according to claim 6, wherein this comprises at least one sheet in the form of a stretched metal sheet.
  8. Heat shield according to one of claims 6 or 7, wherein the knobs have a blunt conical shape.
  9. Heat shield according to one of claims 6 to 8, wherein the metallic sheets are of aluminium.
  10. Heat shield according to one of claims 6 to 9, wherein the metallic sheets are coldsoldered together at their edges.
EP00901030A 1999-02-02 2000-02-02 Method of producing a sound-absorbent insulating element and insulating element produced according to this method Expired - Lifetime EP1149233B2 (en)

Applications Claiming Priority (3)

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CH19299 1999-02-02
CH19299 1999-02-02
PCT/CH2000/000058 WO2000046493A1 (en) 1999-02-02 2000-02-02 Method of producing a sound-absorbent insulating element and insulating element produced according to this method

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EP1149233A1 EP1149233A1 (en) 2001-10-31
EP1149233B1 EP1149233B1 (en) 2003-01-15
EP1149233B2 true EP1149233B2 (en) 2008-09-10

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EP (1) EP1149233B2 (en)
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EP1149233A1 (en) 2001-10-31
US6555246B1 (en) 2003-04-29
JP3578994B2 (en) 2004-10-20
WO2000046493A1 (en) 2000-08-10
DE50001089D1 (en) 2003-02-20
JP2002536184A (en) 2002-10-29

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