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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 EP94104590A EP94104590A EP0639411A1 EP 0639411 A1 EP0639411 A1 EP 0639411A1 EP 94104590 A EP94104590 A EP 94104590A EP 94104590 A EP94104590 A EP 94104590A EP 0639411 A1 EP0639411 A1 EP 0639411A1
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EP
European Patent Office
Prior art keywords
metal
welding
tube
plastic
inner tube
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Granted
Application number
EP94104590A
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German (de)
French (fr)
Other versions
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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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0822—Guiding or aligning the edges of the bent sheet

Definitions

  • the method presented has the basic idea of non-positively forming the plastic inner tube with a metal band and to enable welding by sensibly shaping the band edges.
  • the welding method presented in claim 7 eliminates eight additional edge treatments (trimming, winding or crushing the edge strips), which increases the operational reliability of the manufacturing facility.
  • the alternating-direct current method distributes the thermal load on the pipe joint during welding, with a substantial reduction in welding errors. This increases the performance of the entire facility by increasing the welding speed, the efficiency of the system is increased and the amortization time is reduced.
  • the adhesive process of the two pipes against each other is favored by the non-positive forming and optimized by the shrinking process after the thermal treatment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Arc Welding In General (AREA)

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. So sind die Anmeldungen DE 2 923 544 und E 66 408 B zu nennen.
Beide Verfahren setzen jedoch voraus, daß der Innendurchmesser des Metallmantels größer ist, als der Außendurchmesser des Kunststoff-Innenrohres.
Die Durchmesserunterschiede sind zum Teil klar definiert. Auch wird beschrieben, daß der Metallmantel nach dem Schweißen reduziert wird, um eine Verbindung zwischen den beiden Rohrtypen herzustellen. Nach diese Reduziervorgang sind erst die Voraussetzungen für eine Klebeverbindung der beiden Rohre gegeneinander geschaffen.Such composite pipes are known and have been presented in various process applications. The applications DE 2 923 544 and E 66 408 B are to be mentioned.
However, both methods require that the inside diameter of the metal jacket is larger than the outside diameter of the plastic inner tube.
The differences in diameter are partly clearly defined. It is also described that the metal jacket is reduced after welding to make a connection between the two types of pipes. After this reduction process, the prerequisites for an adhesive connection of the two pipes to one another are created.

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. Das unter Anspruch 7 vorgestellte Schweißverfahren acht zusätzliche Kantenbearbeitungen (Besäumen, Wickeln oder Zerkleinern der Randstreifen) überflüssig, womit die Betriebssicherheit der Fertigungseinrichtung gesteigert wird.The method presented has the basic idea of non-positively forming the plastic inner tube with a metal band and to enable welding by sensibly shaping the band edges. The welding method presented in claim 7 eliminates eight additional edge treatments (trimming, winding or crushing the edge strips), which increases the operational reliability of the manufacturing facility.

Die eng anliegende Umformung des Innenrohres mit den nach außen hochgestellten Bandkanten bietet die Vorteile der besseren Rohrkantenführung. Diese Voraussetzungen sind erforderlich, um störungsfreie, hochproduktive Verfahren zu sichern.The close-fitting reshaping of the inner pipe with the band edges raised upwards offers the advantages of better pipe edge guidance. These prerequisites are necessary to ensure trouble-free, highly productive processes.

Durch das Wechsel- Gleichstrom-Verfahren wird die thermische Belastung des Rohrstoßes beim Schweißen verteilt, wobei eine wesentliche Minderung von Schweißfehlern zu verzeichnen ist.
Damit ist eine Leistungssteigerung der Gesamteinrichtung durch Erhöhung der Schweißgeschwindigkeit gegeben, der Wirkungsgrad der Anlage wird erhöht und die Amortisationszeit wird gekürzt.
Der Klebevorgang der beiden Rohre gegeneinander wird durch die kraftschlüssige Umformung begünstigt und durch den Schrumpfvorgang nach der thermischen Behandlung optimiert.The alternating-direct current method distributes the thermal load on the pipe joint during welding, with a substantial reduction in welding errors.
This increases the performance of the entire facility by increasing the welding speed, the efficiency of the system is increased and the amortization time is reduced.
The adhesive process of the two pipes against each other is favored by the non-positive 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 calibrating devices become superfluous, and the metal jacket does not stretch on the inner tube, which is inevitable in the applications DE 2 923 544 and E 66 408 B.

Claims (12)

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.
Vorzugsweise werden diese Rohre mit 3 lagen gefertigt die in der Reihenfolge wie folgt aufgebaut sind,
Kunststoff- Metall- Kunststoff (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.
Diese Rohrkörper dienen der Förderung von flüssigen oder gasförmigen Medien in erwärmtem oder gekühltem Zustand.
Die Metalleinlagen sind vorzugsweise dünnwandig und sind dem Rohrdurchmesser, sowie dem Verwendungszweck der Rohre angepaßt.
Das freie Formen von dünnen Metallbändern zu Rohren ist wegen der bei Formen auftretenden Randspannungen im Band allgemein bekannt.
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.
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 .
Wegen des geringen spezifischen Gewichtes wird in der Hauptsache Aluminium eingesetzt.
Auch bleiben hiermit die mechanischen Eigenschaften, die Flexibilität und die für die endlos Fertigung so wichtige Trommelbarkeit der Rohre erhalten.The method presented deals with a tubular structure consisting of at least 2 layers of different materials, in which 1 layer consists of PE or VPE plastic and 1 layer consists of metal.
These tubes are preferably manufactured with 3 layers, which are structured in the following order,
Plastic-metal-plastic (FIG. 1)
In order to convert a multilayer pipe into a composite pipe, bonding agents are extruded between the different pipe types (PE - Alu and ALU - PE), which are activated by thermal treatment.
These tubular bodies are used to convey liquid or gaseous media in a heated or cooled state.
The metal inserts are preferably thin-walled and are adapted to the pipe diameter and the intended use of the pipes.
The free forming of thin metal strips into pipes is generally known because of the edge stresses occurring in the strip during the forming.
It is extremely difficult to ensure the guiding of the strip edges for the welding process in the form of the endless production of the thin-walled tubes in such a way that an absolutely optimal and constant welding result can be ensured.
The application is based on the task of sheathing an endlessly extruded plastic tube, a metal band being formed by sensible shaping of the band edges, closely fitting around the plastic pipe in the longitudinal axis and being welded gas-tight.
Because of the low specific weight, aluminum is mainly used.
This also preserves the mechanical properties, the flexibility and the reelability of the pipes, which is so important for endless production. Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß bei Formen des Bandes zum Rohr, das Kunststoff Innenrohr als endlos und synchron mitlaufender Biegedorn genutzt wird. Dieses Verfahren ermöglicht das problemlose Formen von sehr dünnen Bändern um ein Kunststoff- Innenrohr. Die Rohrform als auch die dabei auftretenden Toleranzmaße werden von dem Innenrohr bestimmit.A method according to claim 1, characterized in that when the band is formed into a tube, the plastic inner tube is used as an endless and synchronously running bending mandrel. This process enables very thin strips to be easily formed around a plastic inner tube. The tube shape and the tolerance dimensions that occur are determined by the inner tube. 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.A method according to claim 1 + 2, characterized in that the non-positive shaping of the metal strip around the inner tube avoids oxygen inclusions, which have a disruptive effect in the subsequent longitudinal seam welding and also adversely affect the adhesive connection between the inner tube and the metal jacket. 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 strip edges running in the longitudinal axis are bent into a profiling tool to a height corresponding to the strip thickness (FIG. 2 + 4), the edges at their ends facing away from the tube to form a homogeneous, closed, gas-tight Metallic sheath, preferably by welding together (FIG. 3) Verfahren nach Anspruch 1-4 dadurch gekennzeichnet, daß der Besäumvorgang des Bandes, wie allgemein üblich, nicht erforderlich ist. Die nach DIN sichergestellten Breitentoleranzen für Feinbänder sind für einen störungsfreien Fertigungsablauf absolut ausreichend.Method according to claims 1-4, characterized in that the trimming process of the tape, as is generally customary, is not necessary. The width tolerances for fine strips guaranteed in accordance with DIN are absolutely sufficient for a trouble-free production process. 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 strip edges stabilize the strip and thus ensure better guidance options in the continuous process. 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. (FIG.2 Pos. 1 + 2).
Für den Schweißprozess selbst wird ein Wechsel- Gleichstrom- Verfahren eingesetzt.
Damit ist es möglich, Aluminium ohne weitere Vorbehandlung(Oxydschicht) zu verschweißen und darüber hinaus, homogene und mech. belastbare Schweißnahte zu erzeugen. Als weiteren Vorteil sind die damit erreichbaren Schweißgeschwindigkeiten zu sehen.
Die Schweißkombination, Wechselstrom- Gleichstrom, gibt dieser Art der Fertigung eine größtmögliche Sicherheit im' kontinuierlichen Dauerbetrieb.Method according to claims 1-6, characterized in that this type of strip edge preparation enables longitudinal seam welding of the metal jacket on the plastic inner tube without an air gap. (FIG. 2 pos. 1 + 2).
An AC / DC method is used for the welding process itself.
This makes it possible to weld aluminum without further pretreatment (oxide layer) and, moreover, homogeneous and mechanical. generate resilient welds. The achievable welding speeds are another advantage.
The welding combination, AC-DC, gives this type of production the greatest possible security in 'continuous continuous operation. 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.
Durch die erhöhte Schweißschmelze wird die Schweißnaht homogen, gasdicht und mechanisch höher belastbar.A method according to claim 4, characterized in that better preconditions are created for the following welding process, since the volume of the weld melt is determined by the height of the two strip edges (FIG. 2 item 3), thus increasing the weld seam (FIG. 2 item. h) is determined and optimized in the seam area.
The increased weld melt makes the weld seam homogeneous, gas-tight and mechanically more resilient. Verfahren nach Anspruch 1 - 6 dadurch gekennzeichnet daß nach dem Längsnaht-Schweißen des Rohrstoßes das Rohr, besonders im Bereich der Schweißnaht warm ist. Mit dem Abkühlen der Schweißnaht findet ein Schrumpfvorgang statt (FIG. 3).
Der Metallmantel wird dabei kraftschlüssig auf das Innenrohr gezogen.Method according to claims 1-6, characterized in that after the longitudinal seam welding of the pipe joint, the pipe is warm, especially in the area of the weld seam. As the weld seam cools, a shrinking process takes place (FIG. 3).
The metal jacket is pulled non-positively onto the inner tube. Verfahren nach Anspruch 5 dadurch gekennzeichnet, daß die Rohrkombination Kunststoff- Metall rundum erwärmt wird. 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.A method according to claim 5, characterized in that the tube combination plastic-metal is heated all around. The adhesion promoter is activated and the gluing between the two closely spaced pipes, made of different materials, takes place and is further promoted by the centric shrinking process of the metal jacket. 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.Method according to the preceding claims, characterized in that the raised strip edges running in the longitudinal axis are pressed tightly together during welding, and serve as a guide for the welding head arranged centrally above the strip edge joint. 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. (FIG 3)The method according to the preceding claims offers the advantage that pipe calibration or reducing devices can be dispensed with, since the composite plastic inner pipe is welded to the metal jacket with a precise fit. (FIG 3)
EP94104590A 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)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4310272 1993-03-30
DE4310272A DE4310272A1 (en) 1993-03-30 1993-03-30 Process for producing multilayered composite tubes with metal inserts

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

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AT (1) ATE166806T1 (en)
DE (2) DE4310272A1 (en)

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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 Method for sheathing a plastic tube with a metal band and welding station for welding the overlapping longitudinal edges of the metal band
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
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 A method for manufacturing cold-rolled continuous welded 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 The manufacture method of dual pipe
CN110961811A (en) * 2018-09-29 2020-04-07 宝山钢铁股份有限公司 Manufacturing method of composite pipe
CN112171208A (en) * 2020-09-30 2021-01-05 临沂华庚新材料科技有限公司 Pipeline cutting process for ceramic lining pipe

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DE10022823A1 (en) * 2000-05-10 2001-11-22 Unicor Extrusionstechnik Gmbh Multi-layer metal composite tube manufacture, involving lining formed metal tube with plastic and extruding plastic cover onto the tube exterior
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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
SI2061638T1 (en) 2006-09-02 2018-04-30 Uponor Innovation Ab Method of manufacturing composite pipes from metal and plastic
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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 Process for sheathing a plastic pipe with a metal sheath
CN1081494C (en) * 1995-04-29 2002-03-27 休英有限公司 Method of wrapping plastic pipes with metal cladding
DE19632021C1 (en) * 1996-08-08 1998-01-02 Hewing Gmbh Method for sheathing a plastic tube with a metal band and welding station for welding the overlapping longitudinal edges of the metal band
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
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 A method for manufacturing cold-rolled continuous welded 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 The manufacture method of dual pipe
US10190475B2 (en) 2015-12-04 2019-01-29 Nakagawa Sangyo Co., Ltd. Method for manufacturing a double pipe
CN110961811A (en) * 2018-09-29 2020-04-07 宝山钢铁股份有限公司 Manufacturing method of composite pipe
CN112171208A (en) * 2020-09-30 2021-01-05 临沂华庚新材料科技有限公司 Pipeline cutting process for ceramic lining pipe
CN112171208B (en) * 2020-09-30 2021-08-24 临沂华庚新材料科技有限公司 Pipeline cutting process for ceramic lining pipe

Also Published As

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EP0639411B2 (en) 2002-11-06
DE59406114D1 (en) 1998-07-09
DE4310272A1 (en) 1994-10-06
ATE166806T1 (en) 1998-06-15
EP0639411B1 (en) 1998-06-03

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