DE3920600A1 - Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape - Google Patents

Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape

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Publication number
DE3920600A1
DE3920600A1 DE19893920600 DE3920600A DE3920600A1 DE 3920600 A1 DE3920600 A1 DE 3920600A1 DE 19893920600 DE19893920600 DE 19893920600 DE 3920600 A DE3920600 A DE 3920600A DE 3920600 A1 DE3920600 A1 DE 3920600A1
Authority
DE
Germany
Prior art keywords
insulating layer
pipe
outer tube
tube
exhaust pipe
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.)
Withdrawn
Application number
DE19893920600
Other languages
German (de)
Inventor
Hans-Guenther Dip Haldenwanger
Peter Dr Ing Klose
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.)
Audi AG
Original Assignee
Audi 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
Application filed by Audi AG filed Critical Audi AG
Priority to DE19893920600 priority Critical patent/DE3920600A1/en
Publication of DE3920600A1 publication Critical patent/DE3920600A1/en
Withdrawn legal-status Critical Current

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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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • 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
    • F01N13/141—Double-walled exhaust pipes or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2530/00—Selection of materials for tubes, chambers or housings
    • F01N2530/26—Multi-layered walls

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)

Abstract

The prodn. method is for a double-walled pipe conducting a hot gas, esp. the exhaust pipe (10) for IC engines. It has an insulating layer between the inner (12) and outer (14) pipe. The pipe is next bent into a final shape at the bends. Before bending, the insulating layer (16) is compacted by widening the inner pipe (12) and/or pulling in the outer pipe (14) by means of a pin (20). USE/ADVANTAGE - Even wall thicknesses are achieved with the insulating layer and high insulation.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Heißgase führenden, doppelwandigen Rohres, insbesondere eines Abgasrohres für Brennkraftmaschinen, gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for producing a hot gas leading, double-walled pipe, in particular an exhaust pipe for Internal combustion engines, according to the preamble of claim 1.

Ein derartiges Rohr ist der EP-A 2 85 804 entnehmbar. Das Rohr ist aus einem die Abgase führenden Innenrohr und einem dieses mit Abstand um­ gebenden Außenrohr gebildet, zwischen denen Keramikpulver oder ein Ge­ webe bzw. Gestrick aus Keramikfasern aufgefüllt ist. Insbesondere bei der Verwendung eines keramischen Pulvers wird vorgeschlagen, das Pulver vor dem Biegen einzubringen.Such a tube can be found in EP-A 2 85 804. The pipe is out an inner tube carrying the exhaust gases and one at a distance giving outer tube formed between which ceramic powder or a Ge woven or knitted fabric made of ceramic fibers. Especially at the use of a ceramic powder is suggested, the powder before bending.

In der Praxis hat sich allerdings gezeigt, daß in den Krümmungsbe­ reichen aufgrund der beim Biegen auftretenden Verformungskräfte das Pulver verlagert und verquetscht wird, so daß sehr unterschiedliche Wandstärken an der isolierenden Schicht auftreten. Bei starken Krüm­ mungen kann es sogar vorkommen, daß der Abstand zwischen Innenrohr und Außenrohr zu 0 wird, so daß an dieser Stelle keine Isolierung mehr vorliegt.In practice, however, it has been shown that in the curvature area are sufficient due to the deformation forces that occur during bending Powder is shifted and squeezed, so that very different Wall thicknesses occur on the insulating layer. With strong crumbs It can even happen that the distance between the inner tube and Outer tube becomes 0, so there is no insulation at this point is present.

Aufgabe der Erfindung ist es, das gattungsgemäße Verfahren derart wei­ terzuentwickeln, daß es herstellungstechnisch günstig durchführbar ist und daß gleichmäßige Wandstärken bei der isolierenden Schicht und eine insgesamt hohe Isolationswirkung erzielbar sind.The object of the invention is to know the generic method in such a way to develop that it is technically inexpensive to carry out and that uniform wall thicknesses in the insulating layer and a overall high insulation effect can be achieved.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte und zweckmäßige Weiterbil­ dungen der Erfindung sind den weiteren Patentansprüchen entnehmbar. This object is achieved with the characterizing features of claim 1 solved. Advantageous and expedient training The invention can be found in the other claims.  

Erfindungsgemäß wurde erkannt, daß den Verlagerungen und Verquetschun­ gen der isolierenden Schicht wirkungsvoll entgegengewirkt werden kann, wenn diese Schicht vor dem Biegen durch plastisches Aufweiten des Innenrohres und/oder Einziehen des Außenrohres verdichtet wird. Diese Verdichtung kann entsprechend den Merkmalen der Patentansprüche 2 und 3 mittels eines Ziehdornes durch Aufweiten eines eine geringere Wand­ stärke aufweisenden Innenrohres oder durch Einziehen des Außenrohres durchgeführt werden.According to the invention it was recognized that the displacements and crushing can be counteracted effectively against the insulating layer, if this layer before bending by plastic expansion of the Inner tube and / or pulling in the outer tube is compressed. These Compression can correspond to the features of claims 2 and 3 by means of a mandrel by widening a smaller wall inner tube or by pulling in the outer tube be performed.

Als zweckmäßig kann auch gemäß Patentanspruch 4 zwischen der Isolier­ schicht und dem Innen- bzw. Außenrohr ein Gleitmittel, z.B. Bornitrit, vorgesehen sein. Dieses stellt sicher, daß während des Biegevorganges des Rohres eine gleichmäßigere Druckspannungsverteilung in der Isolier­ schicht stattfindet.It can also be useful according to claim 4 between the insulating layer and a lubricant, e.g. Boron nitrite, be provided. This ensures that during the bending process of the pipe a more even pressure distribution in the insulation layer takes place.

Bevorzugt wird gemäß Patentanspruch 5 eine isolierende Schicht aus mikroporösem Siliziumdioxid mit keramischen Fasern und Trübungsmittel vorgeschlagen. Ein derartiges Material ist beispielsweise unter der Handelsbezeichnung WDS oder Minileit verfügbar und hat sich sowohl hin­ sichtlich der Isoliereigenschaften als auch der mechanischen Belastbar­ keit als besonders vorteilhaft und fertigungstechnisch günstig er­ wiesen. Die isolierende Schicht ist dabei vorzugsweise als ein Pulver­ preßformkörper ausgebildet, z.B. als um das Innenrohr legbare Halb­ schalen.According to claim 5, an insulating layer is preferred microporous silicon dioxide with ceramic fibers and opacifiers suggested. Such a material is, for example, under the Trade name WDS or Minileit available and has gone both ways visually the insulating properties as well as the mechanical resilience speed as particularly advantageous and technically favorable grasslands. The insulating layer is preferably a powder molded body, e.g. as a half that can be placed around the inner tube peel.

Mit den Merkmalen der Patentansprüche 6 und 7 kann ferner in den Rohr­ krümmungsabschnitten der Materialfluß sowie die Spannungsverteilung weiter verbessert werden, um eine gleichmäßige Isolierschicht über den gesamten Umfangsbereich des Rohres zu erzielen.With the features of claims 6 and 7 can also in the tube sections of curvature the material flow and the stress distribution be further improved to provide an even layer of insulation over the to achieve the entire circumferential area of the tube.

Die Erfindung ist im folgenden mit weiteren Einzelheiten näher erläu­ tert. Die beiliegende schematische Zeichnung zeigt abschnittsweise ein doppelwandiges Abgasrohr für eine Brennkraftmaschine bei dessen Bear­ beitung vor dem Biegen in seine Endform. The invention is explained in more detail below with further details tert. The enclosed schematic drawing shows a section double-walled exhaust pipe for an internal combustion engine at its Bear processing before bending into its final shape.  

Das Abgasrohr 10 für eine Brennkraftmaschine setzt sich aus einem Innenrohr 12 geringerer Wandstärke und einem Außenrohr 14 größerer Wandstärke 16 zusammen. Zwischen den beiden Rohren 12,14 ist eine iso­ lierende Schicht aus einem Gemisch aus mikroporösem Siliziumdioxid, keramischen Fasern, Trübungsmittel und anorganischem Vernetzer (Han­ delsbezeichnung WDS) eingebracht. Das dünnwandigere Rohr 12 besteht aus einem hochtemperaturbeständigem Stahl, während das dickwandigere Außen­ rohr als tragendes Bauteil aus einem niederwertigerem Stahl oder aus Aluminium hergestellt ist.The exhaust pipe 10 for an internal combustion engine is composed of an inner pipe 12 with a smaller wall thickness and an outer pipe 14 with a larger wall thickness 16 . Between the two tubes 12 , 14, an insulating layer made of a mixture of microporous silicon dioxide, ceramic fibers, opacifiers and inorganic crosslinking agent (trade name WDS) is introduced. The thin-walled tube 12 consists of a high-temperature-resistant steel, while the thick-walled outer tube as a supporting component is made of a lower-grade steel or aluminum.

Bei der Herstellung des Abgasrohres 10 wird wie folgt verfahren:The procedure for producing the exhaust pipe 10 is as follows:

Die beiden Rohre 12,14 werden ineinander geschoben und zueinander fixiert. Dabei ist das Außenrohr 14 in den Abschnitten, die bei der Endform Krümmungsabschnitte bilden, mit Durchmessererweiterungen wie bei 18 dargestellt versehen.The two tubes 12 , 14 are pushed into one another and fixed to one another. The outer tube 14 is provided in the sections which form curved sections in the final shape with diameter expansions as shown at 18 .

Anschließend werden die inneren und/oder äußeren, einander zugewandten Umfangsflächen des Innenrohres 12 bzw. des Außenrohres 14 mit einem Gleitmittel aus hexagonalem Bornitrit benetzt. Danach wird das in Halb­ schalen gepreßte WDS in den zwischen den beiden Rohren 12, 14 befindli­ chen, freien Ringraum eingebracht. Es versteht sich, daß dabei das Innenrohr 12 und das Außenrohr 14 in einer nicht dargestellten Vor­ richtung zueinander fixiert sind.The inner and / or outer, mutually facing circumferential surfaces of the inner tube 12 and the outer tube 14 are then wetted with a lubricant made of hexagonal boron nitride. Then the half-shell pressed WDS is introduced into the Chen between the two tubes 12 , 14 , free annular space. It is understood that the inner tube 12 and the outer tube 14 are fixed to one another in a direction not shown.

Dann werden das Innenrohr 12 und das Außenrohr 14 an deren nicht darge­ stellten Enden beispielsweise durch Schweißen fest miteinander verbun­ den, wobei das Außenrohr, 14 jeweils derart eingezogen wird, daß dessen Innenumfang dem Außenumfang des inneren Rohres 12 entspricht.Then the inner tube 12 and the outer tube 14 at their ends not shown Darge verbun firmly together, for example by welding, the outer tube 14 is retracted such that its inner circumference corresponds to the outer circumference of the inner tube 12 .

Danach wird die isolierende Schicht 16 in dem nunmehr eine Baueinheit bildenden Abgasrohr 10 verdichtet, indem mittels eines Ziehdornes 20 das Innenrohr 12 plastisch aufgeweitet wird. Der Ziehdorn 20 wird dabei mittels einer nicht näher dargestellten Vorrichtung mit einer Stange 22 in Richtung des Pfeiles 24 durch das Innenrohr 12 hindurchgezogen. The insulating layer 16 is then compressed in the exhaust pipe 10 , which now forms a structural unit, by plastically expanding the inner pipe 12 by means of a mandrel 20 . The drawing mandrel 20 is pulled through the inner tube 12 in the direction of arrow 24 by means of a device (not shown) with a rod 22 .

Alternativ oder zusätzlich dazu wird das Außenrohr 14 in einer nicht dargestellten Rundhämmermaschine (Pfeile 26) in entgegengesetzter Rich­ tung (Pfeil 28) eingezogen bzw. im Durchmesser verringert, um ebenfalls eine Verdichtung der isolierenden Schicht 16 herzustellen. Anstelle des Rundhämmerns kann das Einziehen auch nach dem Pilgerschrittverfahren oder durch isostatisches Kaltpressen erfolgen.Alternatively or in addition, the outer tube 14 is drawn in a rotary hammer machine (arrows 26 ), not shown, in the opposite direction (arrow 28 ) or reduced in diameter in order to also produce a compression of the insulating layer 16 . Instead of round hammering, it can also be pulled in using the pilgrim step method or by cold isostatic pressing.

Nach dem Verdichten der isolierenden Schicht 16 innerhalb des Abgas­ rohres 10 durch plastisches Aufweiten des Innenrohres 12 und/oder durch plastisches Einziehen des Außenrohres 14 wird das Abgasrohr 10 in seine Endform gebogen, wobei die Herstellung der Krümmungsabschnitte aufgrund der Erweiterungen 18 verbessert wird. Es hat sich gezeigt, daß durch diese Erweiterungen die sonst bei Krümmungsabschnitten üblichen Ein­ schnürungen vermieden und dadurch eine gleichmäßige Wandstärke der iso­ lierenden Schicht 16 sichergestellt ist. Das auf zunächst eine der einander zugewandten Umfangswände der Rohre 12, 14 aufgebrachte Gleit­ mittel bewirkt dabei eine gleichmäßige Spannungsverteilung innerhalb der isolierenden Schicht und begünstigt die zwangsläufig erforderlichen Materialverschiebungen in den Krümmungsabschnitten.After compressing the insulating layer 16 within the exhaust pipe 10 by plastic expansion of the inner tube 12 and / or by plastic retraction of the outer tube 14 , the exhaust pipe 10 is bent into its final shape, the production of the curved sections being improved due to the extensions 18 . It has been shown that these extensions avoid the lacing otherwise customary in curvature sections, thereby ensuring a uniform wall thickness of the insulating layer 16 . The medium initially applied to one of the mutually facing peripheral walls of the tubes 12 , 14 causes an even distribution of stress within the insulating layer and favors the inevitable material shifts in the curvature sections.

Die Erfindung ist nicht auf das gezeigte Ausführungsbeispiel be­ schränkt. Es versteht sich, daß gegebenenfalls ein Aufweiten des Innen­ rohres 12 oder ein Einziehen des Außenrohres 14 ausreichen kann, um die isolierende Schicht 16 soweit zu verdichten, daß die eingangs beschrie­ benen Probleme nicht auftreten. In der Zeichnung sind die erforderli­ chen Verformungen bzw. Wandstärken der besseren Übersichtlichkeit wegen übertrieben dargestellt bzw. nicht maßstabsgetreu.The invention is not limited to the embodiment shown. It is understood that optionally expanding the inner tube 12 or retracting the outer tube 14 may be sufficient to compress the insulating layer 16 to such an extent that the problems described above do not occur. In the drawing, the required deformations or wall thicknesses are exaggerated for the sake of clarity or are not drawn to scale.

Claims (7)

1. Verfahren zum Herstellen eines Heißgase führenden, doppelwandigen Rohres, insbesondere eines Abgasrohres für Brennkraftmaschinen, bei dem zwischen Innenrohr und Außenrohr eine isolierende Schicht eingebracht wird und das Rohr anschließend in seine Krümmungsab­ schnitte aufweisende Endform gebogen wird, dadurch gekennzeichnet, daß vor dem Biegen die isolierende Schicht (16) durch plastisches Aufweiten des Innenrohres (12) und/oder Einziehen des Außenrohres (14) verdichtet wird.1. A method for producing a hot gas-carrying, double-walled tube, in particular an exhaust pipe for internal combustion engines, in which an insulating layer is introduced between the inner tube and the outer tube and the tube is then bent into its end shape having Krümmungsab sections, characterized in that before bending the insulating layer ( 16 ) is compressed by plastically widening the inner tube ( 12 ) and / or pulling in the outer tube ( 14 ). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Innen­ rohr (12) mit einer geringeren Wandstärke als das Außenrohr (14) ausgeführt und mittels eines Ziehdornes (20) aufgeweitet wird.2. The method according to claim 1, characterized in that the inner tube ( 12 ) with a smaller wall thickness than the outer tube ( 14 ) and expanded by means of a mandrel ( 20 ). 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Außen­ rohr (14) durch Pilgern oder Rundhämmern eingezogen wird.3. The method according to claim 1, characterized in that the outer tube ( 14 ) is drawn in by pilgrims or rotary hammers. 4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekenn­ zeichnet, daß die von der isolierenden Schicht (16) kontaktierten Umfangsflächen von Innen- und Außenrohr mit einem Gleitmittel be­ netzt werden.4. The method according to any one of the preceding claims, characterized in that the peripheral surfaces of the inner and outer tube contacted by the insulating layer ( 16 ) are wetted with a lubricant. 5. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine isolierende Schicht (16) aus mikroporösem Siliziumdioxid mit keramischen Fasern und Trübungs­ mittel verwendet wird (Handelsbezeichnung z.B. WDS oder Minileit).5. The method according to one or more of the preceding claims, characterized in that an insulating layer ( 16 ) made of microporous silicon dioxide with ceramic fibers and opacifying agent is used (trade name, for example, WDS or Minileit). 6. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wandstärke der isolierenden Schicht (16) vor dem Biegen in den Rohrkrümmungsabschnitten (18) größer gehalten wird. 6. The method according to one or more of the preceding claims, characterized in that the wall thickness of the insulating layer ( 16 ) before bending in the pipe bend sections ( 18 ) is kept larger. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß das Außen­ rohr (14) im Bereich der späteren Krümmungsabschnitte (bei 18) im Durchmesser vergrößert gefertigt wird.7. The method according to claim 6, characterized in that the outer tube ( 14 ) in the region of the later bend sections (at 18 ) is made enlarged in diameter.
DE19893920600 1989-06-23 1989-06-23 Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape Withdrawn DE3920600A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893920600 DE3920600A1 (en) 1989-06-23 1989-06-23 Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893920600 DE3920600A1 (en) 1989-06-23 1989-06-23 Double walled pipe with insulating layer - is used as vehicle exhaust pipe and has pin for bending it into shape

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DE3920600A1 true DE3920600A1 (en) 1991-01-10

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4038979A1 (en) * 1989-12-07 1991-06-13 Vw Werke Vincenz Wiederholt Gm Jacketed pipe for IC engine catalytic exhaust system
DE4039279A1 (en) * 1990-12-08 1992-06-11 Hoelter Heinz Double-wall insulated tube mfr. - in which hot outer tube is pulled over cold inner tube and shrinks onto filler between to give firm, uniform bond
DE4039735A1 (en) * 1990-12-10 1992-06-11 Mannesmann Ag HEAT-EXHAUSTED EXHAUST PIPE AND METHOD FOR PRODUCING THE SAME
EP0523008A1 (en) * 1991-07-08 1993-01-13 Scambia Industrial Developments Aktiengesellschaft Method of manufacturing a silencer or a catalytic converter for exhaust gases
EP0547739A1 (en) * 1991-10-10 1993-06-23 Micropore International Limited Method of forming an insulating tube
US5398407A (en) * 1991-07-08 1995-03-21 Scambia Industrial Developments Aktiengesellschaft Method for producing a device for muffling sound or catalytic treatment of exhaust
DE29614430U1 (en) * 1996-08-09 1996-12-12 Janz, Norbert, Dipl.-Ing., 14612 Falkensee Sandwich component
DE19623996A1 (en) * 1996-06-15 1998-12-03 Daimler Benz Ag Vehicle exhaust pipe heat shield
DE19747947A1 (en) * 1997-10-30 1999-05-06 Otto Volz Pressed heat insulating molding for high temperature use
DE102010024951A1 (en) * 2010-06-24 2011-12-29 Va-Q-Tec Ag Method for molding and connecting vacuum insulating board with non-planar surface area in inner plastic wall of e.g. refrigerant housing, involves pressing vacuum panel on non-planar surface area such that panel receives surface structure

Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137116C (en) *
US952545A (en) * 1910-03-22 American Pipe Lining Corp Apparatus for lining pipes.
DE767011C (en) * 1935-10-23 1951-07-26 Fr Kammerer A G Process for the production of multilayer metal pipes
DE958073C (en) * 1953-02-10 1957-02-14 Dr Hermann Franssen Method and device for plating round profiles by pressing on powder and sintering
US3025596A (en) * 1959-06-26 1962-03-20 Combustion Eng Braze bonding of concentric tubes and shells and the like
US3156042A (en) * 1962-04-10 1964-11-10 Smith Corp A O Method of making duplex wall tubing
DE1501588A1 (en) * 1964-11-25 1969-10-30 Olin Mathieson Heat exchanger and process for its manufacture
DE2019362A1 (en) * 1970-04-22 1971-11-11 Kabel Metallwerke Ghh Laminated welded pipe production process
DE2406650A1 (en) * 1973-02-14 1974-08-29 Alfa Romeo Spa INTERNAL HEAT-PROTECTED EXHAUST PIPES FOR COMBUSTION ENGINES AND TECHNOLOGICAL PROCESS FOR THEIR PRODUCTION
US3863328A (en) * 1972-10-10 1975-02-04 Copperweld Steel Co Method of making a Composite steel tubing
DE2552647A1 (en) * 1974-11-26 1976-08-12 Fuji Heavy Ind Ltd DEVICE FOR THERMAL INSULATION OF EXHAUST PIPES IN COMBUSTION ENGINES
DE2531785A1 (en) * 1975-07-16 1977-01-20 Teleflex Gmbh Metal plastic laminated pipe with bond formed by drawing - with improved centring of plastic insert, the metal component having its dia. reduced by drawing
DE2746180A1 (en) * 1977-10-14 1979-04-19 Willi Oppermann Composite plastics-insulated pipe - comprises mantle shaped from a strip, particulate insulating material, and coaxial inner pipe
DE2813228A1 (en) * 1978-03-28 1979-10-04 Chr Berghoefer & Co Shrink fit assembly of insulation sleeve on tube - has external heater ring moved along tube during application of tensile force
DE2919615A1 (en) * 1979-05-16 1980-12-04 Walter Hunger Multiwalled tubes mfr. by cold drawing - using die to reduce outside dia., or mandrel to expand bore
DE3404771A1 (en) * 1984-02-10 1985-08-14 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Exhaust pipe of a reciprocating-piston internal combustion engine
DE3520955A1 (en) * 1985-06-12 1986-12-18 Wacker-Chemie GmbH, 8000 München CATALYST EXHAUST WITH HEAT INSULATION
DE3432744C2 (en) * 1984-09-06 1987-02-19 LEISTRITZ Maschinenfabrik GmbH, 8500 Nürnberg Emission-protected jacket pipe and process for its manufacture
DE3630399A1 (en) * 1986-09-06 1988-03-17 Messerschmitt Boelkow Blohm Vacuum heat insulation
EP0285804A1 (en) * 1987-04-10 1988-10-12 Leistritz Aktiengesellschaft Emission protected jacketed pipe
EP0318232A1 (en) * 1987-11-26 1989-05-31 Jaguar Cars Limited Insulated pipe

Patent Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137116C (en) *
US952545A (en) * 1910-03-22 American Pipe Lining Corp Apparatus for lining pipes.
DE767011C (en) * 1935-10-23 1951-07-26 Fr Kammerer A G Process for the production of multilayer metal pipes
DE958073C (en) * 1953-02-10 1957-02-14 Dr Hermann Franssen Method and device for plating round profiles by pressing on powder and sintering
US3025596A (en) * 1959-06-26 1962-03-20 Combustion Eng Braze bonding of concentric tubes and shells and the like
US3156042A (en) * 1962-04-10 1964-11-10 Smith Corp A O Method of making duplex wall tubing
DE1501588A1 (en) * 1964-11-25 1969-10-30 Olin Mathieson Heat exchanger and process for its manufacture
DE2019362A1 (en) * 1970-04-22 1971-11-11 Kabel Metallwerke Ghh Laminated welded pipe production process
US3863328A (en) * 1972-10-10 1975-02-04 Copperweld Steel Co Method of making a Composite steel tubing
DE2406650A1 (en) * 1973-02-14 1974-08-29 Alfa Romeo Spa INTERNAL HEAT-PROTECTED EXHAUST PIPES FOR COMBUSTION ENGINES AND TECHNOLOGICAL PROCESS FOR THEIR PRODUCTION
DE2552647A1 (en) * 1974-11-26 1976-08-12 Fuji Heavy Ind Ltd DEVICE FOR THERMAL INSULATION OF EXHAUST PIPES IN COMBUSTION ENGINES
DE2531785A1 (en) * 1975-07-16 1977-01-20 Teleflex Gmbh Metal plastic laminated pipe with bond formed by drawing - with improved centring of plastic insert, the metal component having its dia. reduced by drawing
DE2746180A1 (en) * 1977-10-14 1979-04-19 Willi Oppermann Composite plastics-insulated pipe - comprises mantle shaped from a strip, particulate insulating material, and coaxial inner pipe
DE2813228A1 (en) * 1978-03-28 1979-10-04 Chr Berghoefer & Co Shrink fit assembly of insulation sleeve on tube - has external heater ring moved along tube during application of tensile force
DE2919615A1 (en) * 1979-05-16 1980-12-04 Walter Hunger Multiwalled tubes mfr. by cold drawing - using die to reduce outside dia., or mandrel to expand bore
DE3404771A1 (en) * 1984-02-10 1985-08-14 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Exhaust pipe of a reciprocating-piston internal combustion engine
DE3432744C2 (en) * 1984-09-06 1987-02-19 LEISTRITZ Maschinenfabrik GmbH, 8500 Nürnberg Emission-protected jacket pipe and process for its manufacture
DE3520955A1 (en) * 1985-06-12 1986-12-18 Wacker-Chemie GmbH, 8000 München CATALYST EXHAUST WITH HEAT INSULATION
DE3630399A1 (en) * 1986-09-06 1988-03-17 Messerschmitt Boelkow Blohm Vacuum heat insulation
EP0285804A1 (en) * 1987-04-10 1988-10-12 Leistritz Aktiengesellschaft Emission protected jacketed pipe
DE3712193C2 (en) * 1987-04-10 1989-06-08 Leistritz Ag, 8500 Nuernberg, De
EP0318232A1 (en) * 1987-11-26 1989-05-31 Jaguar Cars Limited Insulated pipe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-AN: D 1863, 7b, 12, vom 10. Juli 1952 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4038979A1 (en) * 1989-12-07 1991-06-13 Vw Werke Vincenz Wiederholt Gm Jacketed pipe for IC engine catalytic exhaust system
DE4039279A1 (en) * 1990-12-08 1992-06-11 Hoelter Heinz Double-wall insulated tube mfr. - in which hot outer tube is pulled over cold inner tube and shrinks onto filler between to give firm, uniform bond
DE4039735A1 (en) * 1990-12-10 1992-06-11 Mannesmann Ag HEAT-EXHAUSTED EXHAUST PIPE AND METHOD FOR PRODUCING THE SAME
EP0523008A1 (en) * 1991-07-08 1993-01-13 Scambia Industrial Developments Aktiengesellschaft Method of manufacturing a silencer or a catalytic converter for exhaust gases
US5398407A (en) * 1991-07-08 1995-03-21 Scambia Industrial Developments Aktiengesellschaft Method for producing a device for muffling sound or catalytic treatment of exhaust
EP0547739A1 (en) * 1991-10-10 1993-06-23 Micropore International Limited Method of forming an insulating tube
DE19623996A1 (en) * 1996-06-15 1998-12-03 Daimler Benz Ag Vehicle exhaust pipe heat shield
DE19623996C2 (en) * 1996-06-15 1999-05-12 Daimler Benz Ag Shield plate for an exhaust pipe and exhaust pipe with such a shield plate
DE29614430U1 (en) * 1996-08-09 1996-12-12 Janz, Norbert, Dipl.-Ing., 14612 Falkensee Sandwich component
DE19747947A1 (en) * 1997-10-30 1999-05-06 Otto Volz Pressed heat insulating molding for high temperature use
DE19747947C2 (en) * 1997-10-30 2001-01-11 Otto Volz Molded thermal insulation
DE102010024951A1 (en) * 2010-06-24 2011-12-29 Va-Q-Tec Ag Method for molding and connecting vacuum insulating board with non-planar surface area in inner plastic wall of e.g. refrigerant housing, involves pressing vacuum panel on non-planar surface area such that panel receives surface structure

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