EP1149233A1 - 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

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Publication number
EP1149233A1
EP1149233A1 EP00901030A EP00901030A EP1149233A1 EP 1149233 A1 EP1149233 A1 EP 1149233A1 EP 00901030 A EP00901030 A EP 00901030A EP 00901030 A EP00901030 A EP 00901030A EP 1149233 A1 EP1149233 A1 EP 1149233A1
Authority
EP
European Patent Office
Prior art keywords
sheets
sound
metallic
sheet
insulating element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00901030A
Other languages
German (de)
French (fr)
Other versions
EP1149233B2 (en
EP1149233B1 (en
Inventor
Evelyn Zwick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoneum International AG
Original Assignee
Rieter Automotive International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Rieter Automotive International AG filed Critical Rieter Automotive International AG
Publication of EP1149233A1 publication Critical patent/EP1149233A1/en
Application granted granted Critical
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Links

Classifications

    • 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
  • Such insulation parts are preferably used in the automotive field and are used there, for example, between the hot catalyst and the vehicle floor.
  • WO 91/10560 describes a heat shield with a film package which comprises heat-conducting zones, so-called heat sinks, and heat-insulating zones.
  • the individual foils of the foil package have embossments or knobs which result in the stacked foils being spaced apart from one another.
  • the individual foils can be hermetically sealed together, with the inclusion of a gas, e.g. Xenon, is made possible.
  • the individual foils are perforated to improve the acoustic effectiveness.
  • the edge areas of these film packages are compressed, cut and then flanged, heat-sealed or mechanically connected without significant pressure.
  • US Pat. No. 5,424,139 discloses an insulation part which comprises a stack of several thin metallic sheets, between which sheets a metallic knitted fabric or an expanded metal-like spacer is inserted. It has been shown that the acoustic effectiveness of these film packages essentially depends on the perforation, the choice of material and the mutual distance between the individual films. In order to be able to select these parameters in the desired manner, suitable foils, preferably made of aluminum, are passed over corresponding spiked rollers and / or knobbed rollers. A change of the knob shape or density, the perforation density or the size of the individual perforations desired by the acoustic specialist necessitates complex tool changes.
  • the aim of this method is to be able to change the perforation density and the air flow resistance generated by such a perforation in a simple and inexpensive 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 can have the form of a film or a thin sheet.
  • the material of at least one metallic sheet is studded in one process step and this studded sheet is connected to at least one second metallic sheet in a further process step.
  • the elastic limit of the sheet material is exceeded in such a way that hairline cracks or. Fissures form.
  • thin sheets can be fissured as well as thick foil, or sheets in the form of expanded metal can be used. It is also particularly advantageous if aluminum is used as the material for these sheets.
  • a particularly preferred embodiment of the method according to the invention provides that the individual metallic layers, in particular foils or Sheets, cold welded together.
  • Cold welding is understood in the following to mean a metallurgical connection which is brought about by a plastic deformation of two or more adjacent foils or sheets, in which deformation the metallic material of adjacent sheets is bonded. With aluminum, such a connection can be achieved if, for example, adjacent metal sheets are compressed by approx. 75%.
  • 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, the at least one metallic sheet having a plurality of knobs and / or
  • the method according to the invention proves to be surprisingly simple and leads to sound-absorbing insulation parts with surprisingly good sound absorption.
  • FIG. 2 shows a schematic representation of two sheets produced and stacked according to the invention.
  • a web-shaped metal foil 12 is continuously pulled off a roll 13 for the production of the insulation parts according to the invention and is passed through a roller device 14 for nubbing.
  • This roller device 14 essentially comprises a knob roller 15 and a counter roller 16, which is coated with an elastic material, or can be provided with a sieve-like structure interacting with the knob roller 15.
  • This counter roller 16 presses the film 12 against the knobs of the knob roller 15.
  • the knobs of the knob roller 15 and the counter roller 16 are matched to one another such that the
  • Foil material 12 can be influenced in a simple manner.
  • the brittleness or elasticity of the film material to be nubbed also plays a role.
  • the fissured film 13 is then cut 19 and stacked 20 in a known manner. It goes without saying 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 and fastened to one another in a known manner.
  • the elastic limit of the metallic material of the film 12 is exceeded during the nub in the roller device 14 in such a way that a large number of irregularly arranged fissures 4, 11 are formed. It turns out to be surprising that these fissures 4 dissipate the acoustic energy better than needled perforations and thus sound-absorbing insulation parts, in particular heat shields, can be produced with improved acoustic effectiveness.
  • the air flow resistance on the surface of an acoustically effective insulation part can be varied in a simple manner and set in such a way that optimal sound dissipation can be achieved for any insulation part of any shape. According to the invention, this optimization or adjustment takes place via the number, density and length of the fissures.
  • the film thickness or sheet thickness and the design of the Roller device 14 can form fissures 4, 11 of different lengths. In this way, a high fissure density with shorter fissures 4 (which occur, for example, at locations with the greatest stretching stress, ie at the nub tips 10) can be achieved, and a lower fissure density with longer fissures 11, which extend over two or more nubs 5, can be produced .
  • 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 placed one above the other for the production of sound-absorbing insulation parts and connected to one another by means of flanging, tacking, gluing or cold welding.
  • a film or sheet can be used as the second metallic sheet, which can be imperforate or perforated, in particular fissured, which can be nubbed, ribbed or undeformed, which can be more or less stiff, can have different thicknesses, or in the form of an expanded metal can be used.
  • cold welding is understood to mean a metallurgical connection which comes about through a plastic deformation of two or more adjacent sheets, during which deformation the metallic material of adjacent sheets is bonded together.
  • Such a connection can be achieved with aluminum if the material is compressed, for example, by approx. 75%.
  • the production method shown here can be automated further, for example by pulling the different sheets simultaneously from different rolls or stacks and then cut, shaped and / or cold welded together.
  • FIG. 2 shows two sheets 2, 3 fissured and stacked according to the invention. These sheets have a plurality of knobs 5 which ensure that the two sheets 2, 3 are spaced apart.
  • the fissures 4, 11 produced in the production method according to the invention are essentially in the area of the pimpled comb 10, since, when pimples, the stretching of the material occurs most pronouncedly in this area and the elastic limit of the material is exceeded according to the invention. It goes without saying that the number and length of the individual fissures 4, 11 can be varied by the choice of the sheet material.
  • the person skilled in the art is also free to design the special shape of the knobs in a suitable manner, i.e. to form the individual knobs 5 as hemispherical, frustoconical, pyramidal, cuboid or cylindrical bulges and to select their density, arrangement and size in the desired manner.
  • the insulation parts according to the invention have at least two sheets 2, 3, at least one of which is fissured according to the invention.
  • These sheets 2, 3 are preferably made of aluminum and can be imperforate or perforated, in particular fissured, nubbed, ribbed or undeformed, more or less stiff, of different thicknesses or in the form of an expanded metal.
  • these sheets can be supplemented with carrier plates of known type or with metallic insulation fabrics or nonwovens.

Landscapes

  • 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)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Building Environments (AREA)

Abstract

The invention relates to a method of producing a sound-absorbent insulating element with at least two metallic leaves (2, 3) in the form of films or sheets. According to said method, at least one of said elements is provided with knobs in such a manner that the limit of elasticity of the respective leaf (2, 3) is exceeded during the knobbing process, resulting in the formation of fissures (4, 11). Said fissures substantially help to improve the acoustic absorption capacity of the insulating element produced according to the inventive method.

Description

Verfahren zum Herstellen eines schallabsorbierenden Isolationsteils und ein nach diesem Verfahren hergestelltes IsolationsteilMethod for producing a sound absorbing insulation part and an insulation part produced according to this method
Die vorliegende Erfindung betrifft ein Verfahren zurThe present invention relates to a method for
Herstellung eines Isolationsteils gemäss Oberbegriff des Anspruchs 1, sowie ein damit hergestelltes Isolationsteil gemäss Oberbegriff des Anspruchs 6.Production of an insulation part according to the preamble of claim 1, and an insulation 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 field and are used there, for example, between the hot 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.Isolation parts of this type are known and are described, for example, in PCT application WO 91/10560 or US Pat. No. 5,424,139. WO 91/10560 describes a heat shield with a film package which comprises heat-conducting zones, so-called heat sinks, and heat-insulating zones. In particular, the individual foils of the foil package have embossments or knobs which result in the stacked foils being spaced apart from one another. The individual foils can be hermetically sealed together, with the inclusion of a gas, e.g. Xenon, is made possible. In a further development of this known heat shield, the individual foils are perforated to improve the acoustic effectiveness. In practice, the edge areas of these film packages are compressed, cut and then flanged, heat-sealed or mechanically connected without significant pressure.
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. 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 Grosse der einzelnen Perforationen, macht aufwendige Werkzeugänderungen erforderlich.US Pat. No. 5,424,139 discloses an insulation part which comprises a stack of several thin metallic sheets, between which sheets a metallic knitted fabric or an expanded metal-like spacer is inserted. It has been shown that the acoustic effectiveness of these film packages essentially depends on the perforation, the choice of material and the mutual distance between the individual films. In order to be able to select these parameters in the desired manner, suitable foils, preferably made of aluminum, are passed over corresponding spiked rollers and / or knobbed rollers. A change of the knob shape or density, the perforation density or the size of the individual perforations desired by the acoustic specialist necessitates complex tool changes.
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 the object of the present invention to provide a method for producing a sound-absorbing insulation part, in particular a sound-absorbing heat shield, which allows them to be produced in a few process steps and adjustments or. Make changes to the foil parameters in a simple manner. In particular, the aim of this method is to be able to change the perforation density and the air flow resistance generated by such a perforation in a simple and inexpensive 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 Ver- fahren 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 can have the form of a film or a thin sheet. In this method, the material of at least one metallic sheet is studded in one process step and this studded sheet is connected to at least one second metallic sheet in a further process step. When the at least one metallic sheet is pimpled, the elastic limit of the sheet material is exceeded in such a way that hairline cracks or. Fissures form. In this method according to the invention, thin sheets can be fissured as well as thick foil, or sheets in the form of expanded metal can be used. It is also particularly advantageous if aluminum is used as the material for these sheets.
Eine besonders bevorzugte Ausgestaltung des erfindungs- gemässen Verfahrens sieht vor, dass die einzelnen metallischen Lagen, insbesondere Folien resp. Blätter, mitein- ander 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 metal- lische 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 method according to the invention provides that the individual metallic layers, in particular foils or Sheets, cold welded together. Cold welding is understood in the following to mean a metallurgical connection which is brought about by a plastic deformation of two or more adjacent foils or sheets, in which deformation the metallic material of adjacent sheets is bonded. With aluminum, such a connection can be achieved if, for example, adjacent metal sheets are compressed by approx. 75%.
Darüberhinaus ist es Aufgabe der Erfindung ein Isolationsteil, insbesondere ein Hitzeschild mit verbesserter und in einfacher Weise optimierbarer akustischer Wirksamkeit zu schaffen.In addition, it is an object of the invention to provide an insulation part, in particular a heat shield, with improved acoustic effectiveness which can be optimized in a simple manner.
Diese Aufgabe wird erfindungsgemäss durch ein schall- absorbierendes 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/oderThis 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, the at least one metallic sheet having a plurality of knobs and / or
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.Has fissures and is connected to the at least second sheet and deformed into a shaped insulation part. It is particularly advantageous if these metallic sheets are made of aluminum.
Das erfindungsgemässe Verfahren erweist sich als über- raschend einfach und führt zu schallabsorbierenden Isolationsteilen mit einer überraschend guten Schallabsorption.The method according to the invention proves to be surprisingly simple and leads to sound-absorbing insulation parts with 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 of the invention, the advantages and properties of the invention are explained below by way of example with reference to the figures or are evident from the following description of the preferred embodiment.
Dabei zeigen:Show:
Fig. 1 eine schematische Darstellung des erfindungs- gemässen Herstellungsverfahrens ;1 shows a schematic representation of the manufacturing method according to the invention;
Fig. 2 eine schematische Darstellung zweier erfindungs- ge äss hergestellter und gestapelter Blätter.2 shows a schematic representation of two sheets produced and stacked according to the invention.
Für die Herstellung der erfindungsge ässen Isolations- teile 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 dieIn a preferred embodiment, a web-shaped metal foil 12 is continuously pulled off a roll 13 for the production of the insulation parts according to the invention and is passed through a roller device 14 for nubbing. This roller device 14 essentially comprises a knob roller 15 and a counter roller 16, which is coated with an elastic material, or can be provided with a sieve-like structure interacting with the knob roller 15. This counter roller 16 presses the film 12 against the knobs of the knob roller 15. According to the invention, the knobs of the knob roller 15 and the counter roller 16 are matched to one another such that the
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 Grosse der beim Noppen auftretenden Fissuren 4, 11 imPartially tears open film 12 when knotted in this roller device 14. By simply choosing the elastic material of the jacket of the counter-roller 16 or by appropriately spacing the rollers, the number and size of the fissures 4, 11 occurring in the pimples can
Folienmaterial 12 in einfacher Weise beeinflusst werden. 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.Foil material 12 can be influenced in a simple manner. The brittleness or elasticity of the film material to be nubbed also plays a role. The fissured film 13 is then cut 19 and stacked 20 in a known manner. It goes without saying 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 and fastened to one another in a known manner.
Erfindungsge äss 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 Perfora- tionen, 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 Luftströmungs- widerstand 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 erfindungs- gemäss über die Anzahl, Dichte und Länge der Fissuren.According to the invention, the elastic limit of the metallic material of the film 12 is exceeded during the nub in the roller device 14 in such a way that a large number of irregularly arranged fissures 4, 11 are formed. It turns out to be surprising that these fissures 4 dissipate the acoustic energy better than needled perforations and thus sound-absorbing insulation parts, in particular heat shields, can be produced with improved acoustic effectiveness. In addition, with such fissured foils, the air flow resistance on the surface of an acoustically effective insulation part can be varied in a simple manner and set in such a way that optimal sound dissipation can be achieved for any insulation part of any shape. According to the invention, this optimization or adjustment takes place via 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 grosster 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 therefore easily tearing material is used, because it allows good fissure formation to be achieved during the pimples. Depending on the choice of material, the film thickness or sheet thickness and the design of the Roller device 14 can form fissures 4, 11 of different lengths. In this way, a high fissure density with shorter fissures 4 (which occur, for example, at locations with the greatest stretching stress, ie at the nub tips 10) can be achieved, and a lower fissure density with longer fissures 11, which extend over two or more nubs 5, can be produced .
Nach dem Noppen wird das Material der Bahn 12 in vorge- gebene 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 the knobs, the material of the web 12 is cut into predetermined parts and stacked. In a simplest embodiment, at least a first sheet fissured in the above manner and a second metallic sheet are placed one above the other for the production of sound-absorbing insulation parts and connected to one another by means of flanging, tacking, gluing or cold welding. A film or sheet can be used as the second metallic sheet, which can be imperforate or perforated, in particular fissured, which can be nubbed, ribbed or undeformed, which can be more or less stiff, can have different thicknesses, or in the form of an expanded metal can be used.
Wie bereits oben erläutert wurde, wird unter Kaltver- schweissen 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 already explained above, cold welding is understood to mean a metallurgical connection which comes about through a plastic deformation of two or more adjacent sheets, during which deformation the metallic material of adjacent sheets is bonded together. Such a connection can be achieved with aluminum if the material is compressed, for example, by approx. 75%.
Es versteht sich, dass das hier aufgezeigte Herstellungsverfahren weiter automatisiert werden kann, indem bei- spielsweise die verschiedenen Blätter gleichzeitig von unterschiedlichen Rollen oder Stapeln abgezogen werden und dann gemeinsam zugeschnitten, geformt und/oder kalt- verschweisst werden.It goes without saying that the production method shown here can be automated further, for example by pulling the different sheets simultaneously from different rolls or stacks and then cut, shaped and / or cold welded together.
Figur 2 zeigt zwei erfindungsgemäss fissurierte und ge- stapelte 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, quader- förrαige oder zylindrische Auswölbungen auszubilden und deren Dichte, Anordnung und Grosse in gewünschter Weise auszuwählen.FIG. 2 shows two sheets 2, 3 fissured and stacked according to the invention. These sheets have a plurality of knobs 5 which ensure that the two sheets 2, 3 are spaced apart. The fissures 4, 11 produced in the production method according to the invention are essentially in the area of the pimpled comb 10, since, when pimples, the stretching of the material occurs most pronouncedly in this area and the elastic limit of the material is exceeded according to the invention. It goes without saying that the number and length of the individual fissures 4, 11 can be varied by the choice of the sheet material. The person skilled in the art is also free to design the special shape of the knobs in a suitable manner, i.e. to form the individual knobs 5 as hemispherical, frustoconical, pyramidal, cuboid or cylindrical bulges and to 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 insulation parts according to the invention have at least two sheets 2, 3, at least one of which is fissured according to the invention. These sheets 2, 3 are preferably made of aluminum and can be imperforate or perforated, in particular fissured, nubbed, ribbed or undeformed, more or less stiff, of different thicknesses or in the form of an expanded metal. When using these insulation parts as heat shields, these sheets can be supplemented with carrier plates of known type or with metallic insulation fabrics or nonwovens.

Claims

Patentansprüche claims
1. Verfahren zum Herstellen eines schallabsorbierenden Isolationsteils, insbesondere eines schallab- sorbierenden Hitzeschildes, mit mindestens zwei metallischen Blättern in Form von Folien oder Blechen, von denen mindestens eines genoppt wird, und welche Blätter miteinander verbunden und verformt werden, dadurch gekennzeichnet, dass mindestens ein fissuriertes Blatt (2) erzeugt wird, indem beim Noppen des Materials des mindestens einen metallischen Blattes die Elastizitätsgrenze desselben derart überschritten wird, dass sich Fissuren (4) bilden.1. A method for producing a sound-absorbing insulating part, in particular a sound-absorbing heat shield, with at least two metallic sheets in the form of foils or sheets, at least one of which is nubbed, and which sheets are connected and deformed, characterized in that at least one fissured sheet (2) is produced in that when the material of the at least one metallic sheet is pimpled, the elastic limit thereof is exceeded in such a way that fissures (4) form.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mindestens ein Blatt in Form eines Streckmetalls verwendet wird.2. The method according to claim 1, characterized in that at least one sheet in the form of an expanded metal is used.
Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass beim Noppen des Materials des mindestens einen Blattes kegelstumpfförmige Noppen erzeugt werden.Method according to one of claims 1 or 2, characterized in that when the material of the at least one sheet is pimpled, frustoconical pimples are produced.
Verfahren nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, dass Aluminium als Material für die Blätter verwendet wird.Method according to one of claims 1 to 3, characterized in that aluminum is used as the material for the leaves.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die metallischen Blätter im Randbereich miteinander kaltverschweisst werden.5. The method according to any one of claims 1 to 4, characterized in that the metallic sheets are cold welded together in the edge region.
6. Schallabsorbierendes Isolationsteil, insbesondere schallabsorbierendes Hitzeschild, hergestellt nach dem Verfahren gemäss Anspruch 1, dadurch gekenn- zeichnet, dass dieses mindestens zwei metallische Blätter in Form von Folien oder Blechen umfasst, von denen mindestens eines eine Vielzahl von Noppen (5) und Fissuren (4, 11) aufweist und welche Blätter (2, 3) miteinander verbunden sind.6. Sound-absorbing insulation part, in particular sound-absorbing heat shield, produced by the method according to claim 1, characterized is characterized in that it comprises at least two metallic sheets in the form of foils or sheets, at least one of which has a plurality of knobs (5) and fissures (4, 11) and which sheets (2, 3) are connected to one another.
7. Isolationsteil nach Anspruch 6, dadurch gekennzeichnet, dass dieses mindestens ein Blatt in Form eines Streckmetalls aufweist.7. Insulation part according to claim 6, characterized in that it has at least one sheet in the form of an expanded metal.
8. Isolationsteil nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass die Noppen kegelstumpfför ig sind.8. Insulation part according to one of claims 6 or 7, characterized in that the knobs are truncated cone.
9. Isolationsteil nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die metallischen Blätter aus Aluminium bestehen.9. Insulation part according to one of claims 6 to 8, characterized in that the metallic sheets consist of aluminum.
10. Isolationsteil nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die metallischen10. Insulation part according to one of claims 6 to 9, characterized in that the metallic
Blätter im Randbereich miteinander kaltverschweisst sind. Leaves in the marginal area are cold-welded together.
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)

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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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