EP0639411A1 - Process for the manufacturing of multi layer composite tubes with ferrous and non ferrous metal inlets - Google Patents

Process for the manufacturing of multi layer composite tubes with ferrous and non ferrous metal inlets Download PDF

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Publication number
EP0639411A1
EP0639411A1 EP19940104590 EP94104590A EP0639411A1 EP 0639411 A1 EP0639411 A1 EP 0639411A1 EP 19940104590 EP19940104590 EP 19940104590 EP 94104590 A EP94104590 A EP 94104590A EP 0639411 A1 EP0639411 A1 EP 0639411A1
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EP
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Prior art keywords
metal
tube
welding
plastic
inner tube
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Granted
Application number
EP19940104590
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German (de)
French (fr)
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EP0639411B2 (en )
EP0639411B1 (en )
Inventor
Emil H. Friedrich
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Uponor Innovation AB
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Hewing GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/08Making tubes with welded or soldered seams
    • B21C37/09Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/08Making tubes with welded or soldered seams
    • B21C37/0822Guiding or aligning the edges of the bent sheet

Abstract

A process is claimed for mfg. a composite tube with two or more layers of different materials, at least one layer being polyethylene (PE) or crosslinked PE and another being metal. Tubes pref. comprise three layers with the metal (2) sandwiched between the plastic layers. The metal layer (2) is thin-walled and cut to suit the dia. of the inner tube (1). The metal layer (2), pref. of aluminium, is wrapped around the continuous inner tube (1) and a gas-tight weld formed between the contacting free ends. The plastic inner tube (1) acts as a bending mandrel for the metal band (2) and moves continuously and synchronously with it. Tube shape and dimensional tolerances are determined by the plastic tube (1) and therefore calibration and reducing devices are unnecessary. Exclusion of oxygen from the construction improves welding and the bond between the inner tube (1) and metal band (2). Free edges on the metal (2) are turned up by a shaping tool to form mating faces which when welded are gas tight. The free edges of the metal layer (2) are trimmed in a machine in front of the tube forming machine to ensure equal band (2) width and oxide free edges for gas welding. Turned-up edges act as stabilisers and guides for the tube during continuous prodn.

Description

  • Derartige Verbundrohre sind bekannt und wurden in verschiedenen verfahrensanmeldungen vorgestellt. Such composite tubes are known and have been presented in various process registrations. So sind die Anmeldungen DE 2 923 544 und E 66 408 B zu nennen. Thus, the applications DE 2923544 and E 66 408 B are to be mentioned.
    Beide Verfahren setzen jedoch voraus, daß der Innendurchmesser des Metallmantels größer ist, als der Außendurchmesser des Kunststoff-Innenrohres. However, both methods require that the inner diameter of the metal shell is larger than the outer diameter of the inner plastic tube.
    Die Durchmesserunterschiede sind zum Teil klar definiert. The diameter differences are clearly defined in part. Auch wird beschrieben, daß der Metallmantel nach dem Schweißen reduziert wird, um eine Verbindung zwischen den beiden Rohrtypen herzustellen. Also that the metal shell is reduced after welding, to connect between the two types of tubes is described. Nach diese Reduziervorgang sind erst die Voraussetzungen für eine Klebeverbindung der beiden Rohre gegeneinander geschaffen. After this reduction operation the requirements for an adhesive connection of the two tubes are only against each other together.
  • Das vorgestellte Verfahren hat den Grundgedanken das Kunststoff-Innenrohr mit eine Metallband kraftschlüssig zu Umformen und durch sinnvolles Formen der Bandkanten die Schweißung zu ermöglichen. The method presented is to allow the principles of the plastic inner pipe with a metal strip to frictionally forming and by practical shapes of the band edges the weld. Das unter Anspruch 7 vorgestellte Schweißverfahren acht zusätzliche Kantenbearbeitungen (Besäumen, Wickeln oder Zerkleinern der Randstreifen) überflüssig, womit die Betriebssicherheit der Fertigungseinrichtung gesteigert wird. The presented under claim 7 welding method eight additional edge finishing (trimming, wrap or grinding of the edge strips) superfluous, thus the reliability of the manufacturing apparatus is increased.
  • Die eng anliegende Umformung des Innenrohres mit den nach außen hochgestellten Bandkanten bietet die Vorteile der besseren Rohrkantenführung. The tight-fitting forming the inner tube with the raised outward band edges offers the benefits of better tube edge guide. Diese Voraussetzungen sind erforderlich, um störungsfreie, hochproduktive Verfahren zu sichern. These requirements are necessary to ensure trouble-free, highly productive method.
  • Durch das Wechsel- Gleichstrom-Verfahren wird die thermische Belastung des Rohrstoßes beim Schweißen verteilt, wobei eine wesentliche Minderung von Schweißfehlern zu verzeichnen ist. By alternating DC method, the thermal load of the pipe joint is distributed during welding, whereby a substantial reduction of welding defects can be observed.
    Damit ist eine Leistungssteigerung der Gesamteinrichtung durch Erhöhung der Schweißgeschwindigkeit gegeben, der Wirkungsgrad der Anlage wird erhöht und die Amortisationszeit wird gekürzt. Thus an increase in performance of the overall device is given by increasing the welding speed, the efficiency of the system is increased and the payback period is shortened.
    Der Klebevorgang der beiden Rohre gegeneinander wird durch die kraftschlüssige Umformung begünstigt und durch den Schrumpfvorgang nach der thermischen Behandlung optimiert. The bonding process of the two pipes against each other is facilitated by the frictional forming and optimized by the shrinking process after the thermal treatment.
  • Reduzier- oder Kalibriereinrichtungen werden überflüssig, eine Verstreckung des Metallmantels auf dem Innenrohr, die bei den Anmeldungen DE 2 923 544 und E 66 408 B unumgänglich sind, findet nicht statt. Reducing or calibration will be superfluous, a stretching of the metal jacket on the inner tube, which are unavoidable in applications DE 2923544 and E 66 408 B does not take place.

Claims (12)

  1. Das vorgestellte Verfahren befaßt sich mit einem rohrförmigen Gebilde, bestehend aus mindestens 2 Lagen unterschiedlicher Werkstoffe, bei dem 1 Lage aus PE oder VPE Kunststoff und 1 Lage aus Metall besteht. The presented method is concerned with a tubular fabric consisting of at least 2 layers of different materials, wherein one layer of PE or XLPE plastic, and 1 sheet of metal.
    Vorzugsweise werden diese Rohre mit 3 lagen gefertigt die in der Reihenfolge wie folgt aufgebaut sind, Preferably, these pipes are made with 3 layers which are built up in the order as follows;
    Kunststoff- Metall- Kunststoff (FIG. 1) Plastic, metal plastic (FIG. 1)
    Um ein Mehrlagenrohr in ein Verbundrohr zu wandeln, werden zwischen die unterschiedlichen Rohrtypen,(PE - Alu und ALU - PE), Haftvermittler extrudiert, die mittels thermischer Behandlung aktiviert werden. In order to convert a multi-layer pipe in a composite tube are between the different types of pipe, (PE - Alu and ALU - PE) is extruded, adhesion promoters, which are activated by thermal treatment.
    Diese Rohrkörper dienen der Förderung von flüssigen oder gasförmigen Medien in erwärmtem oder gekühltem Zustand. These tube bodies serve the conveyance of liquid or gaseous media in a heated or cooled state.
    Die Metalleinlagen sind vorzugsweise dünnwandig und sind dem Rohrdurchmesser, sowie dem Verwendungszweck der Rohre angepaßt. The metal inserts are preferably thin-walled and the pipe diameter as well as the intended use of the tubes are adapted.
    Das freie Formen von dünnen Metallbändern zu Rohren ist wegen der bei Formen auftretenden Randspannungen im Band allgemein bekannt. The free forms of thin metal strips into tubes is well known because of the forms occurring in border tensions in the band.
    So ist es außerordentlich schwierig, bei der endlos Fertigung der dünnwandigen Rohre die Führung der Bandkanten für den Schweißprozess in der Form sicherzustellen, daß ein absolut optimales, und gleichbleibendes Schweißergebnis sichergestellt werden kann. So it is extremely difficult in the endless production of thin-walled tubes ensure the leadership of the band edges for the welding process in the form that an absolute optimum, and consistent welding results can be ensured.
    Der Anmeldung liegt die Aufgabe zugrunde, ein endlos extrudiertes Kunststoffrohr zu ummanteln, wobei ein Metallband durch sinnvolles Formen der Bandkanten, eng anliegend um das Kunststoffrohr in der Längsachse geformt und gasdicht verschweißt wird . The application is based on the object to wrap a continuously extruded plastic tube, a metal strip by practical forms of the strip edges closely formed around the plastic pipe in the longitudinal axis and a gas-tight welded.
    Wegen des geringen spezifischen Gewichtes wird in der Hauptsache Aluminium eingesetzt. Because of the low specific gravity is used mainly aluminum.
    Auch bleiben hiermit die mechanischen Eigenschaften, die Flexibilität und die für die endlos Fertigung so wichtige Trommelbarkeit der Rohre erhalten. Even with this, the mechanical properties, flexibility and so important for the endless production winding capability of the tubes remain.
  2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß bei Formen des Bandes zum Rohr, das Kunststoff Innenrohr als endlos und synchron mitlaufender Biegedorn genutzt wird. A method according to claim 1, characterized in that when forming the band to the tube, the plastic inner tube is used as an endlessly and synchronously Revolving bending mandrel. Dieses Verfahren ermöglicht das problemlose Formen von sehr dünnen Bändern um ein Kunststoff- Innenrohr. This method allows easy forming of very thin bands around a plastic inner tube. Die Rohrform als auch die dabei auftretenden Toleranzmaße werden von dem Innenrohr bestimmit. The tube shape and the dimensions tolerance occurring are bestimmit from the inner tube.
  3. Verfahren nach Anspruch 1 + 2 dadurch gekennzeichnet, daß durch das kraftschlüssige Formen des Metallbandes um das Innenrohr Sauerstoffeinschlüsse vermieden werden, die beim anschliessenden Längsnahtschweißen störend wirken und auch die Klebeverbindung zwischen Innenrohr und Metallummantelung negativ beeinflussen. The method of claim 1 + 2 characterized in that are avoided by the frictional forms of the metal strip around the inner pipe oxygen inclusions, which have a disturbing effect during the subsequent longitudinal seam welding, and also adversely affect the adhesive bond between the inner tube and the metal shell.
  4. Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß die in Längsachse laufenden Bandkanten in eine Profilierwerkzeug auf eine Höhe, entsprechend der Bandstärke angebogen werden(FIG. 2+4), wobei die Kanten an ihrem dem Rohr abgekehrten Enden zur Bildung einer homogenen, geschlossenen, gasdichten Hülle metallisch, vorzugsweise durch Schweißen miteinander verbunden werden (FIG. 3) A method according to claim 1 characterized in that the running in the longitudinal axis of the strip edges in a profiling tool to a height, be curved corresponding to the band thickness (FIG. 2 + 4), the edges at its side remote from the pipe ends to form a homogeneous, closed, gas-tight Case metallic, preferably joined together by welding (FIG. 3)
  5. Verfahren nach Anspruch 1-4 dadurch gekennzeichnet, daß der Besäumvorgang des Bandes, wie allgemein üblich, nicht erforderlich ist. Method according to claim 1-4 characterized in that the trimming process of the tape, as is common, is not required. Die nach DIN sichergestellten Breitentoleranzen für Feinbänder sind für einen störungsfreien Fertigungsablauf absolut ausreichend. The seized DIN width tolerances for fine bands are absolutely sufficient for trouble-free production process.
  6. Verfahren nach Anspruch 4 dadurch gekennzeichnet, daß die beiden nach außen hochgestellten Bandkanten das Band stabilisieren und somit bessere Führungsmöglichkeiten im kontinuierlichen Prozessablauf sicherstellen. A method according to claim 4 characterized in that the two outwardly raised band edges stabilize the tape, thus ensuring better guidance possibilities in the continuous process flow.
  7. Verfahren nach Anspruch 1-6 dadurch gekennzeichnet, daß durch diese Art der Bandkantenvorbereitung das Längsnahtschweißen des Metallmantels auf dem Kunststoff-Innenrohr, ohne Luftspalt ermöglicht wird. Method according to claim 1-6 characterized in that the longitudinal seam welding of the metal jacket is made possible on the plastic inner tube, without air gap, this type of tape edge preparation. (FIG.2 Pos. 1 + 2). (FIG.2 Pos. 1 + 2).
    Für den Schweißprozess selbst wird ein Wechsel- Gleichstrom- Verfahren eingesetzt. For the welding process itself is a direct exchange is used method.
    Damit ist es möglich, Aluminium ohne weitere Vorbehandlung(Oxydschicht) zu verschweißen und darüber hinaus, homogene und mech. This makes it possible to weld aluminum without further pretreatment (oxide) and beyond, homogeneous and mech. belastbare Schweißnahte zu erzeugen. to produce reliable weld seams. Als weiteren Vorteil sind die damit erreichbaren Schweißgeschwindigkeiten zu sehen. As a further advantage, the so achievable welding speeds can be seen.
    Die Schweißkombination, Wechselstrom- Gleichstrom, gibt dieser Art der Fertigung eine größtmögliche Sicherheit im' kontinuierlichen Dauerbetrieb. The welding combination, AC-DC, gives this type of production the greatest possible safety in the 'continuous operation.
  8. Verfahren nach Anspruch 4 dadurch gekennzeichnet, daß bessere Vorbedingungen für den folgenden Schweißprozess geschaffen sind, da durch die Höhe der beiden Bandkanten (FIG. 2 Pos.3) das Volumen der Schweißschmelze bestimmt wird, womit die Überhöhung der Schweißnaht (FIG. 2 Pos. h) im Nahtbereich festgelegt und optimiert wird. A method according to claim 4 characterized in that better conditions for the subsequent welding process are created, as by the height of the two band edges, the volume of the weld puddle is determined (FIG. 2 Item 3), with which the reinforcement of the weld (FIG. 2 Pos. h) is set in the seam area and optimized.
    Durch die erhöhte Schweißschmelze wird die Schweißnaht homogen, gasdicht und mechanisch höher belastbar. Due to the increased melt welding the weld is homogeneous, gastight and higher mechanical loads.
  9. Verfahren nach Anspruch 1 - 6 dadurch gekennzeichnet daß nach dem Längsnaht-Schweißen des Rohrstoßes das Rohr, besonders im Bereich der Schweißnaht warm ist. The method of claim 1 - 6 characterized in that, particularly in the region of the weld after the longitudinal seam welding of the pipe joint, the pipe warm. Mit dem Abkühlen der Schweißnaht findet ein Schrumpfvorgang statt (FIG. 3). With the cooling of the weld, a shrinking process is (. 3 FIG) instead.
    Der Metallmantel wird dabei kraftschlüssig auf das Innenrohr gezogen. The metal shell is thereby positively drawn onto the inner tube.
  10. Verfahren nach Anspruch 5 dadurch gekennzeichnet, daß die Rohrkombination Kunststoff- Metall rundum erwärmt wird. The method of claim 5, characterized in that the pipe combination plastic metal is completely heated. Der Haftvermittler wird aktiviert und die Verklebung zwischen den beiden eng aufeinander liegenden Rohren, aus unterschiedlichen Werkstoffen findet statt und wird nochmals durch den zentrisch einsetzenden Schrumpfvorgang des Metallmantels begünstigt. The adhesion promoter is activated and the bonding between the two lying close to each other pipes, made of different materials occurs and is again favored by the centrally onset shrinking process of the metal shell.
  11. Verfahren nach den vorstehenden Ansprüchen dadurch gekennzeichnet, daß die in Längsachse laufenden, hochgestellten Bandkanten beim Schweißen fest zusammengepreßt sind, und als Führung dienen für den mittig, über dem Bandkantenstoß angeordneten Schweißkopf. The method according to the preceding claims characterized in that the running in the longitudinal axis, raised strip edges are pressed firmly together during welding, and as a guide used for the centrally disposed above the belt edge joint welding head.
  12. Verfahren nach den vorstehenden Ansprüchen bietet den Vorteil, daß auf Rohr-Kalibrier- oder Reduziereinrichtungen verzichtet werden kann, da der Verbund Kunststoff- Innenrohr mit dem Metallmantel maß- und passgenau geschweißt wird. The method according to the preceding claims offers the advantage that can be dispensed tube calibration or reduction means, since the composite tailor plastic inner tube to the metallic shell and is welded precisely. (FIG 3) (FIG 3)
EP19940104590 1993-03-30 1994-03-22 Process for the manufacturing of multi layer composite tubes with ferrous and non ferrous metal inlets Expired - Lifetime EP0639411B2 (en)

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DE19934310272 DE4310272A1 (en) 1993-03-30 1993-03-30 Process for producing multilayered composite tubes with metal inserts
DE4310272 1993-03-30

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EP0639411A1 true true EP0639411A1 (en) 1995-02-22
EP0639411B1 EP0639411B1 (en) 1998-06-03
EP0639411B2 EP0639411B2 (en) 2002-11-06

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DE19515853C1 (en) * 1995-04-29 1996-08-22 Hewing Gmbh Metal jacket application method for plastics pipes
DE19632021C1 (en) * 1996-08-08 1998-01-02 Hewing Gmbh A method for sheathing a plastic pipe with a metal strip and welding station for welding the overlapping longitudinal edges of the metal strip
US6293311B1 (en) 1998-05-22 2001-09-25 Pmd Holdings Corp. Multilayer composite pipe fluid conduit system using multilayer composite pipe and method of making the composite
WO2004067269A2 (en) * 2003-01-31 2004-08-12 Horst Bonn Plastic-metal composite pipe comprising a metallic double envelope and method and device for producing the same
CN100415436C (en) 2004-09-16 2008-09-03 吉欣(英德)热轧不锈复合钢有限公司;严孟杰 Method for producing cold rolling continuous welding metal inner composite pipe
US7950229B2 (en) * 2007-02-10 2011-05-31 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine
CN106825107A (en) * 2015-12-04 2017-06-13 中川产业株式会社 Method for manufacturing a double pipe

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DE29511606U1 (en) * 1995-07-18 1995-11-02 Inventa Ag Coolant line
DE19646859C1 (en) * 1996-11-13 1998-04-23 Hewing Gmbh A method for sheathing a plastic pipe with a metal band
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DE10318328B3 (en) * 2003-04-19 2004-07-15 Uponor Innovation Ab Bonded plastic-metal tube for heating installation has plastic base tube with oxygen diffusion blocking layer on it and layer of bonding material on that, with metal band on it
CA2663326C (en) 2006-09-02 2014-12-30 Uponor Innovation Ab Method for the production of a cylindrical, strand-shaped part
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Cited By (12)

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Publication number Priority date Publication date Assignee Title
DE19515853C1 (en) * 1995-04-29 1996-08-22 Hewing Gmbh Metal jacket application method for plastics pipes
WO1996034708A1 (en) * 1995-04-29 1996-11-07 Hewing Gmbh Process for sheathing a plastic pipe with a metal sheath
US5704537A (en) * 1995-04-29 1998-01-06 Hewing Gmbh Method for sheathing a plastic tube with a metal sheathing
DE19515853C2 (en) * 1995-04-29 2001-01-18 Hewing Gmbh A method for sheathing a plastic pipe with a metal jacket
DE19632021C1 (en) * 1996-08-08 1998-01-02 Hewing Gmbh A method for sheathing a plastic pipe with a metal strip and welding station for welding the overlapping longitudinal edges of the metal strip
EP0823295A1 (en) * 1996-08-08 1998-02-11 Hewing GmbH Method for sheathing a plastic pipe with a metal strip and welding station for welding lapping edges of the metal strip
US6293311B1 (en) 1998-05-22 2001-09-25 Pmd Holdings Corp. Multilayer composite pipe fluid conduit system using multilayer composite pipe and method of making the composite
WO2004067269A2 (en) * 2003-01-31 2004-08-12 Horst Bonn Plastic-metal composite pipe comprising a metallic double envelope and method and device for producing the same
WO2004067269A3 (en) * 2003-01-31 2004-11-04 Horst Bonn Plastic-metal composite pipe comprising a metallic double envelope and method and device for producing the same
CN100415436C (en) 2004-09-16 2008-09-03 吉欣(英德)热轧不锈复合钢有限公司;严孟杰 Method for producing cold rolling continuous welding metal inner composite pipe
US7950229B2 (en) * 2007-02-10 2011-05-31 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine
CN106825107A (en) * 2015-12-04 2017-06-13 中川产业株式会社 Method for manufacturing a double pipe

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EP0639411B2 (en) 2002-11-06 grant
DE4310272A1 (en) 1994-10-06 application
EP0639411B1 (en) 1998-06-03 grant

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