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EP2205371B1 - Method for producing pipe-in-pipe systems - Google Patents

Method for producing pipe-in-pipe systems Download PDF

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Publication number
EP2205371B1
EP2205371B1 EP08802587.9A EP08802587A EP2205371B1 EP 2205371 B1 EP2205371 B1 EP 2205371B1 EP 08802587 A EP08802587 A EP 08802587A EP 2205371 B1 EP2205371 B1 EP 2205371B1
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EP
European Patent Office
Prior art keywords
pipe
tube
pressing pressure
outer pipe
pressing
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EP08802587.9A
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German (de)
French (fr)
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EP2205371A2 (en
Inventor
Jochen Beissel
Thilo Reichel
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Eisenbau Kramer Mbh
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Eisenbau Kramer Mbh
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • 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
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall tubes

Definitions

  • the invention relates to a method for producing a tube-in-tube system comprising an outer tube and at least one inner tube forming a composite tube, wherein the at least one inner tube over the entire length or at least over a larger part of the entire length of the outer tube and in which the at least one inner tube and the outer tube are brought into contact mechanically by exerting a pressing pressure.
  • the DE 32 32 297 A1 shows a method for connecting nested tubular parts of a heat exchanger and a tool for performing the method.
  • a two-piece composite pressing member with axially conical cavity axially over the nested tubular parts moves to the connection of the two longitudinally juxtaposed tubes only in to effect a short, specially designed connection section.
  • a reliable connection is achieved essentially only by positive engagement or an intermediate binding substance.
  • it is not a pipe-in-pipe system in the sense of the present application.
  • the DE 19 15 846 A1 shows a further method for connecting ends of tubes facing each other, wherein a crimp connection is made in order to achieve a tight connection.
  • the connecting part has a circular bore and a concentric polygonal outer surface, the surfaces of which cooperate with the inner sides of a radially compressed die, wherein either the polygonal inner side of the die or the polygonal outer sides of the connecting part are convexly shaped, in order to radially compress two opposing Gesenkab songse a deformation of the connecting part to the tube circumference cause, which also results in a positive connection.
  • this is not a pipe-in-pipe system.
  • the invention has for its object to provide a method of the type mentioned, with the improved properties of tube-in-tube systems of inner tube and outer tube can be achieved.
  • the pressing pressure is applied by means of an impact press with molding tools.
  • the control of the Impander press and the design of the molds, e.g. in their extension over the circumference and length of the pipe system allow adjustments to the material and geometry of the pipe system.
  • the pressing pressure is applied to the outer tube by means of more than two circumferentially distributed molds.
  • the inner contour of the molds is adapted to the peripheral contour of the outer tube in the circumferential direction.
  • a composite tube is thereby obtained by using a relatively thick-walled carrier tube as the outer tube and a thin-walled tube made of a material which is resistant to abrasion and / or chemical action as the inner tube.
  • the manufacturing process of the composite pipe is further facilitated by the fact that with the exercise of the pressing pressure at the same time the peripheral contour of the pipe-in-pipe system is addressed.
  • An advantageous use of the method is that it is used to apply a thin-walled inner coating in a carrier tube in order to produce a suitable inner coating for different uses.
  • the figure shows schematically a tube-in-tube system 1 of an outer tube 2 and an inner tube 3 and an impeller means for producing a composite tube from the outer tube 2 and inner tube 3.
  • the inner tube 3 extends over the entire length of the outer tube. 2 or at least a larger part of it.
  • the impeller device has two shaping tools 10 arranged offset in the circumferential direction, which are acted upon by means of at least one respective impingement cylinder 11 with a force K directed radially inward relative to the pipe system 1 in order to generate the pressing pressure for the impositioning process.
  • the Impanderzylinder 11 are suitably controlled in coordination with the pipe system, thereby simultaneously with the imposition process also straightening the pipe assembly z.
  • the impeller according to the invention more than two, e.g. arranged four molds, which are acted upon by means of respectively associated Impanderzylinder 11 with the required, matched to the pipe system pressing force, wherein also a upsetting path is controlled.
  • one or more molds 10 may be arranged in series, which are also actuated by means of several Impanderzylinder 11. It is also possible to store one or more axially arranged in series forming tools 10 rigid and to move the rest of Impanderzylinder 11.
  • the outer tube 2, in particular a carrier tube may have a multiple wall thickness of the inner tube 3.
  • the outer tube 2, according to the invention a support tube, and the inner tube 3, according to the invention a coating tube, or also several tubes pushed into each other and pressed by the external force by means of the molds 10 radially inwardly against each other.
  • the force of the outer tube 2 is pressed onto the inner tube 3, and there is a mechanical bond between the two tubular body.
  • compressive stresses are additionally generated in the materials from the outside, which positively influence the material with regard to the mechanical technological material values, whereby pipes with stable, relatively thick-walled outer support tube and against chemical and mechanical influences, such as corrosion and abrasion, resistant relatively thin-walled inner tubes be used to obtain composite pipes, the respective applications are optimally adapted.
  • the plastic deformation also results in an improvement of the mechanical properties and, moreover, a standardization of the residual stress situation, for example in the area of welds, is effected.
  • a non-positive connection of the pipe system can also be achieved with regard to different stress / strain profiles of the materials of the tubular body.
  • the impanding process in coordination with the different material and geometric properties the tubular body are controlled so that after elastic springing a different state of stress caused by the elastic resilience of the two tubular body, the springback of the inner tube 3 is stronger than the springback of the outer tube 2 and by the larger remindfederweg of the inner tube 3, a solid bond is formed.
  • the method can thus also be used advantageously for different pipe materials in order to connect them to a stable pipe system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines Rohr-in-Rohr-Systems aus einem Außenrohr und mindestens einem Innenrohr, die ein Verbundrohr bilden, bei dem sich das mindestens eine Innenrohr über die gesamte Länge oder zumindest über einen größeren Teil der gesamten Länge des Außenrohres erstreckt und bei dem das mindestens eine Innenrohr und das Außenrohr mechanisch durch Ausübung eines Pressdrucks miteinander in Verbindung gebracht werden.The invention relates to a method for producing a tube-in-tube system comprising an outer tube and at least one inner tube forming a composite tube, wherein the at least one inner tube over the entire length or at least over a larger part of the entire length of the outer tube and in which the at least one inner tube and the outer tube are brought into contact mechanically by exerting a pressing pressure.

Derartige mechanische Verfahren zur Herstellung von Rohr-in-Rohr-Systemen, bei denen ein äußeres und ein inneres Rohr ineinander gesteckt und mittels eines Pressdrucks miteinander verbunden werden, arbeiten herkömmlicherweise (ohne vorhandenen druckschriftlichen Beleg) mit Expansionsverfahren über hydraulische Innendrucksysteme oder mechanische Expander, mit denen das Innenrohr gegen das Außenrohr gedrückt wird. Dadurch lässt sich das Innenrohr kraftschlüssig gegen die Innenseite des Außenrohrs pressen und ein kraftschlüssiger Verbund erhalten, wobei ausgenutzt werden kann, dass das Außenrohr in der Regel dickwandiger ist und das Trägerrohr bildet, während das Innenrohr dünnwandiger ist und sich leichter verformen lässt. Dabei kann es jedoch zu ungünstigen Zugbeanspruchungen kommen.Such mechanical processes for the production of tube-in-tube systems, in which an outer and an inner tube are inserted into one another and connected by means of a pressing pressure, conventionally work (without existing printed document) with expansion methods via internal hydraulic pressure systems or mechanical expander where the inner tube is pressed against the outer tube. As a result, the inner tube can be pressed non-positively against the inside of the outer tube and obtain a non-positive bond, wherein it can be exploited that the outer tube is usually thick-walled and forms the support tube, while the inner tube is thinner and easier to deform. However, this can lead to unfavorable tensile stresses.

Die DE 32 32 297 A1 zeigt ein Verfahren zum Verbinden von ineinander gesteckten rohrförmigen Teilen eines Wärmetauschers und ein Werkzeug zur Durchführung des Verfahrens. Hierbei wird nach dem Zusammenstecken der rohrförmigen Teile, von denen eines einen aufgetulpten Abschnitt eines Rohres darstellt, ein aus zwei Hälften zusammengesetztes Presselement mit in axialer Richtung konischem Hohlraum axial über die ineinander gesteckten rohrförmigen Teile bewegt, um die Verbindung der beiden längs aneinandergereihten Rohre lediglich in einem kurzen, besonders ausgestalteten Verbindungsabschnitt zu bewirken. Bei dieser Vorgehensweise wird eine zuverlässige Verbindung jedoch im Wesentlichen nur durch Formschluss oder eine zwischengebrachte Bindesubstanz erreicht. Auch handelt es sich nicht um ein Rohr-in-Rohr-System im Sinne vorliegender Anmeldung.The DE 32 32 297 A1 shows a method for connecting nested tubular parts of a heat exchanger and a tool for performing the method. Here, after the mating of the tubular parts, one of which is a recessed portion of a tube, a two-piece composite pressing member with axially conical cavity axially over the nested tubular parts moves to the connection of the two longitudinally juxtaposed tubes only in to effect a short, specially designed connection section. In this approach, however, a reliable connection is achieved essentially only by positive engagement or an intermediate binding substance. Also, it is not a pipe-in-pipe system in the sense of the present application.

Die DE 19 15 846 A1 zeigt ein weiteres Verfahren zur Verbindung von mit ihren Enden einander zugekehrten Rohren, wobei eine Quetschverbindung vorgenommen wird, um eine dichte Verbindung zu erzielen.The DE 19 15 846 A1 shows a further method for connecting ends of tubes facing each other, wherein a crimp connection is made in order to achieve a tight connection.

Auch in der US 2,102,325 A ist ein Verfahren zum Herstellen einer Art Quetschverbindung zwischen einander zugekehrten Enden zweier rohrförmiger Abschnitte gezeigt.Also in the US 2,102,325 A For example, there is shown a method of making a type of crimp connection between facing ends of two tubular sections.

In der DE 1 652 872 C ist ein weiteres Verfahren und eine Vorrichtung zum Verbinden zwischen einem zylindrischen Rohr und einem auf dieses aufgeschobenen Verbindungsteil offenbart. Das Verbindungsteil besitzt eine kreisförmige Bohrung und eine zu dieser konzentrische polygonale Außenseite, deren Flächen mit den Innenseiten eines radial zusammengedrückten Gesenks zusammenwirken, wobei entweder die polygonförmige Innenseite des Gesenks oder die polygonalen Außenseiten des Verbindungsteils konvex geformt sind, um beim radialen Zusammendrücken zweier gegenüberliegender Gesenkabschnitte eine Verformung des Verbindungsteils auf den Rohrumfang zu bewirken, wodurch sich ebenfalls ein Formschluss ergibt. Auch dabei handelt es sich nicht um ein Rohr-in-Rohr-System.In the DE 1 652 872 C For example, there is disclosed another method and apparatus for connecting between a cylindrical tube and a coupling member slid onto it. The connecting part has a circular bore and a concentric polygonal outer surface, the surfaces of which cooperate with the inner sides of a radially compressed die, wherein either the polygonal inner side of the die or the polygonal outer sides of the connecting part are convexly shaped, in order to radially compress two opposing Gesenkabschnitte a deformation of the connecting part to the tube circumference cause, which also results in a positive connection. Again, this is not a pipe-in-pipe system.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art bereitzustellen, mit dem verbesserte Eigenschaften von Rohr-in-Rohr-Systemen aus Innenrohr und Außenrohr erreicht werden.The invention has for its object to provide a method of the type mentioned, with the improved properties of tube-in-tube systems of inner tube and outer tube can be achieved.

Diese Aufgabe wird mit den Merkmalen des Anspruches 1 gelöst. Hierbei ist vorgesehen, dass im Zusammenhang mit den im Oberbegriff angegebenen Maßnahmen der Pressdruck von außen auf die Außenseite des Außenrohres aufgebracht wird.This object is achieved with the features of claim 1. It is provided that in connection with the measures specified in the preamble of the pressing pressure is applied from the outside to the outside of the outer tube.

In Untersuchungen der Erfinder hat sich überraschend gezeigt, dass sich mit dieser Vorgehensweise ein stabiler, widerstandsfähiger Rohrverbund erzielen lässt, obwohl in der Regel das außenseitige Trägerrohr für den Pressvorgang gegenüber dem inneren Rohr, beispielsweise einem Beschichtungsrohr, schwerer verformbar ist. Dennoch lassen sich durch die radiale Kompression und Stauchung von der Rohraußenseite mit einer Impanderpresse ein kraftschlüssiger und, soweit erwünscht, zusätzlich auch ein formschlüssiger Verbund erreichen, wobei gegebenenfalls durch die plastische Verformung beim Impandierprozess zudem eine Verbesserung der mechanischen Eigenschaften des Rohrsystems erhalten wird. Dabei kann gleichzeitig auch eine Vereinheitlichung der Eigenspannungssituation z.B. auch im Schweißnahtbereich bei längsgeschweißten Rohren erzielt werden.Investigations by the inventors have surprisingly shown that a stable, resistant tube composite can be achieved with this procedure, although generally the outside carrier tube for the pressing process with respect to the inner tube, for example a coating tube, is more difficult to deform. Nevertheless, can be achieved by the radial compression and compression of the outside of the tube with an Impander press a frictional and, if desired, in addition, a positive bond, which optionally also an improvement of the mechanical properties of the pipe system is obtained by the plastic deformation during impanding. At the same time, it is also possible to achieve a standardization of the residual stress situation, for example also in the weld seam area in longitudinally welded pipes.

Aus Untersuchungen der Erfinder hat sich ergeben, dass ein stabiles Rohrsystem dadurch erhalten wird, dass Innenrohr und Außenrohr hinsichtlich ihrer Materialeigenschaften und/oder ihrer geometrischen Abmessungen in der Weise aufeinander abgestimmt werden, dass sich nach Stauchung durch den aufgebrachten Pressdruck über einen vorgegebenen oder vorgebbaren Stauchweg durch elastische Rückfederung ein kraftschlüssiger Verbund ergibt.Investigations by the inventors have shown that a stable pipe system is obtained by matching the inner pipe and the outer pipe with respect to their material properties and / or their geometric dimensions in such a way that, after being compressed by the applied pressure, a predetermined or predefinable compression path elastic return results in a frictional bond.

Erfindungsgemäß wird der Pressdruck mittels einer Impanderpresse mit Formwerkzeugen aufgebracht. Die Steuerung der Impanderpresse und die Auslegung der Formwerkzeuge z.B. in ihrer Ausdehnung über Umfang und Länge des Rohrsystems lassen dabei Anpassungen an Material und Geometrie des Rohrsystems zu.According to the invention, the pressing pressure is applied by means of an impact press with molding tools. The control of the Impander press and the design of the molds, e.g. in their extension over the circumference and length of the pipe system allow adjustments to the material and geometry of the pipe system.

Für die Steuerung des Impandiervorganges wird der Pressdruck mittels mehr als zwei in Umfangsrichtung verteilter Formwerkzeuge auf das Außenrohr aufgebracht. Die Innenkontur der Formwerkzeuge ist dabei an die Umfangskontur des Außenrohres in Umfangsrichtung angepasst.For the control of the impositioning process, the pressing pressure is applied to the outer tube by means of more than two circumferentially distributed molds. The inner contour of the molds is adapted to the peripheral contour of the outer tube in the circumferential direction.

Ein Verbundrohr wird dabei dadurch erhalten, dass als Außenrohr ein relativ dickwandiges Trägerrohr und als Innenrohr ein dünnwandigeres Rohr aus einem gegen Abrieb und/oder chemische Einwirkung widerstandsfähigen Material eingesetzt wird.A composite tube is thereby obtained by using a relatively thick-walled carrier tube as the outer tube and a thin-walled tube made of a material which is resistant to abrasion and / or chemical action as the inner tube.

Der Herstellungsprozess des Verbundrohres wird des Weiteren dadurch begünstigt, dass mit der Ausübung des Pressdruckes gleichzeitig die Umfangskontur des Rohr-in-Rohr-Systems gerichtet wird.The manufacturing process of the composite pipe is further facilitated by the fact that with the exercise of the pressing pressure at the same time the peripheral contour of the pipe-in-pipe system is addressed.

Ferner ist für die Herstellung eines stabilen Rohrverbundes günstig, dass beim Pressvorgang eine plastische Verformung bewirkt wird.Furthermore, it is favorable for the production of a stable tube composite that a plastic deformation is effected during the pressing process.

Eine vorteilhafte Anwendung des Verfahrens besteht darin, dass es zum Aufbringen einer dünnwandigen Innenbeschichtung in einem Trägerrohr verwendet wird, um eine geeignete Innenbeschichtung für unterschiedliche Verwendungszwecke herstellen zu können.An advantageous use of the method is that it is used to apply a thin-walled inner coating in a carrier tube in order to produce a suitable inner coating for different uses.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert.The invention will be explained in more detail by means of embodiments with reference to the drawing.

Die Fig. zeigt schematisch ein Rohr-in-Rohr-System 1 aus einem Außenrohr 2 und einem Innenrohr 3 sowie eine Impandereinrichtung zum Herstellen eines Rohrverbundes aus dem Außenrohr 2 und Innenrohr 3. Das Innenrohr 3 erstreckt sich dabei über die gesamte Länge des Außenrohres 2 oder zumindest über einen größeren Teil desselben. Die Impandereinrichtung weist vorliegend zwei in Umfangsrichtung versetzt angeordnete Formwerkzeuge 10 auf, die mittels mindestens eines jeweiligen Impanderzylinders 11 mit einer bezüglich des Rohrsystems 1 radial nach innen gerichteten Kraft K beaufschlagt werden, um den Pressdruck für den Impandiervorgang zu erzeugen. Dabei werden die Impanderzylinder 11 in Abstimmung auf das Rohr-system geeignet gesteuert, wodurch gleichzeitig mit dem Impandierprozess auch ein Richten des Rohrverbundes z. B. auf gleichen Innendurchmesser oder auf gleichen Außendruchmesser vorgenommen werden kann. Gemäß der erfindungsgemäßen Ausgestaltung der Impandiereinrichtung sind in Umfangsrichtung mehr als zwei, z.B. vier Formwerkzeuge angeordnet, die mittels jeweils zugeordneter Impanderzylinder 11 mit der erforderlichen, auf das Rohrsystem abgestimmten Presskraft beaufschlagt werden, wobei auch ein Stauchweg gesteuert wird. In axialer Rich-tung des Rohrsystems 1 können ein oder mehrere Formwerkzeuge 10 in Reihe angeordnet sein, die auch mittels mehrerer Impanderzylinder 11 betätigt werden. Auch ist es möglich, ein bzw. mehrere axial in Reihe angeordnete Formwerkzeuge 10 starr zu lagern und die übrigen über Impanderzylinder 11 zu bewegen. Das Außenrohr 2, insbesondere ein Trägerrohr, kann eine mehrfache Wandstärke des Innenrohres 3 aufweisen.The figure shows schematically a tube-in-tube system 1 of an outer tube 2 and an inner tube 3 and an impeller means for producing a composite tube from the outer tube 2 and inner tube 3. The inner tube 3 extends over the entire length of the outer tube. 2 or at least a larger part of it. In the present case, the impeller device has two shaping tools 10 arranged offset in the circumferential direction, which are acted upon by means of at least one respective impingement cylinder 11 with a force K directed radially inward relative to the pipe system 1 in order to generate the pressing pressure for the impositioning process. In this case, the Impanderzylinder 11 are suitably controlled in coordination with the pipe system, thereby simultaneously with the imposition process also straightening the pipe assembly z. B. on the same inner diameter or on the same external diameter can be made. According to the embodiment of the impeller according to the invention, more than two, e.g. arranged four molds, which are acted upon by means of respectively associated Impanderzylinder 11 with the required, matched to the pipe system pressing force, wherein also a upsetting path is controlled. In the axial direction of the pipe system 1, one or more molds 10 may be arranged in series, which are also actuated by means of several Impanderzylinder 11. It is also possible to store one or more axially arranged in series forming tools 10 rigid and to move the rest of Impanderzylinder 11. The outer tube 2, in particular a carrier tube, may have a multiple wall thickness of the inner tube 3.

Zum Herstellen des Rohrverbundes werden das Außenrohr 2, erfindungsgemäß ein Trägerrohr, und das Innenrohr 3, erfindungsgemäß ein Beschichtungsrohr, oder auch mehrere Rohre ineinander geschoben und durch die äußere Krafteinwirkung mittels der Formwerkzeuge 10 radial nach innen gegeneinander verpresst. Durch die Krafteinwirkung wird das Außenrohr 2 auf das Innenrohr 3 gedrückt, und es kommt zu einem mechanischen Verbund der beiden Rohrkörper. Mittels des Impandierprozesses werden zudem von außen Druckspannungen in den Werkstoffen erzeugt, die das Material hinsichtlich der mechanisch technologischen Werkstoffwerte positiv beeinflussen, wobei Rohre mit stabilem, relativ dickwandigem äußerem Trägerrohr und gegen chemische und mechanische Einflüsse, wie z.B. Korrosion und Abrieb, beständige relativ dünnwandige Innenrohre verwendet werden um Verbundrohre zu erhalten, die jeweiligen Anwendungsfällen optimal angepasst sind. Es wird eine kraftschlüssige und, soweit erwünscht und mit entsprechender Ausgestaltung versehen, auch eine formschlüssige Verbindung der zwei oder mehr Rohrkörper erreicht, und zwar lokal oder über die gesamte Rohrlänge. Dies geschieht unter plastischer Verformung, und zwar so, dass sich der Durchmesser durch Kompression oder Stauchung über den gesamten Umfang verringert. Dabei wird auch eine Kaltverfestigung erzielt. Durch zusätzliches Richten können gleichzeitig Toleranzen hinsichtlich Durchmesser, Ovalität bzw. Rundheit ausgeglichen werden.To produce the composite pipe, the outer tube 2, according to the invention a support tube, and the inner tube 3, according to the invention a coating tube, or also several tubes pushed into each other and pressed by the external force by means of the molds 10 radially inwardly against each other. By the force of the outer tube 2 is pressed onto the inner tube 3, and there is a mechanical bond between the two tubular body. By means of the impanding process, compressive stresses are additionally generated in the materials from the outside, which positively influence the material with regard to the mechanical technological material values, whereby pipes with stable, relatively thick-walled outer support tube and against chemical and mechanical influences, such as corrosion and abrasion, resistant relatively thin-walled inner tubes be used to obtain composite pipes, the respective applications are optimally adapted. It is a non-positive and, if desired and provided with appropriate design, also achieved a positive connection of the two or more tubular body, locally or over the entire length of the pipe. This is done under plastic deformation, in such a way that the diameter is reduced by compression or compression over the entire circumference. In this case, a cold work hardening is achieved. By additional straightening tolerances can be compensated for diameter, ovality and roundness at the same time.

Durch die plastische Verformung wird auch eine Verbesserung der mechanischen Eigenschaften erhalten, und zudem wird eine Vereinheitlichung der Eigenspannungssituation, beispielsweise im Bereich von Schweißnähten, bewirkt.The plastic deformation also results in an improvement of the mechanical properties and, moreover, a standardization of the residual stress situation, for example in the area of welds, is effected.

Durch die Stauchung bzw. Kompression kann ein kraftschlüssiger Verbund des Rohrsystems auch im Hinblick auf unterschiedliche Spannungs-/Dehnungsverläufe der Materialien der Rohrkörper erzielt werden. Dabei kann der Impandierprozess in Abstimmung auf die unterschiedlichen materiellen und geometrischen Eigenschaften der Rohrkörper so gesteuert werden, dass nach elastischer Rückfederung ein unterschiedlicher Spannungszustand durch die elastische Rückfederung der beiden Rohrkörper entsteht, wobei die Rückfederung des Innenrohres 3 stärker ist als die Rückfederung des Außenrohres 2 und durch den größeren Rückfederweg des Innenrohres 3 ein fester Verbund entsteht. Das Verfahren lässt sich damit auch vorteilhaft bei verschiedenen Rohrmaterialien einsetzen, um diese zu einem stabilen Rohrsystem zu verbinden.Due to the compression or compression, a non-positive connection of the pipe system can also be achieved with regard to different stress / strain profiles of the materials of the tubular body. Here, the impanding process in coordination with the different material and geometric properties the tubular body are controlled so that after elastic springing a different state of stress caused by the elastic resilience of the two tubular body, the springback of the inner tube 3 is stronger than the springback of the outer tube 2 and by the larger Rückfederweg of the inner tube 3, a solid bond is formed. The method can thus also be used advantageously for different pipe materials in order to connect them to a stable pipe system.

Claims (4)

  1. Method for producing a pipe-in-pipe system (1) from an outer pipe (2) and at least one inner pipe (3), these pipes forming a composite pipe in which the at least one inner pipe (3) extends over the entire length, or at least over a comparatively large part of the entire length, of the outer pipe (2) and in which the at least one inner pipe (3) and the outer pipe (2) are mechanically connected to one another by the application of a pressing pressure,
    characterized
    in that the at least one inner pipe (3) and the outer pipe (2) are coordinated with one another in respect of their material properties and/or of their geometrical dimensions such that, after compression as a result of the applied pressing pressure over a pre-defined or pre-definable compression distance, a force-fitting composite is achieved on account of elastic recovery,
    in that the pressing pressure is applied from outside onto the outer side of the outer pipe (2) by means of an Impander® press having more than two forming tools (10) distributed in the circumferential direction,
    in that the pressing force of Impander® cylinders (11) assigned to the forming tools (10) is coordinated with the material properties and geometrical properties of the pipe system and a compression distance is controlled such that, after the elastic recovery, a different state of tension is created on account of the elastic recovery of the two pipe bodies, wherein the recovery of the inner pipe (3) is greater than the recovery of the outer pipe (2), and
    in that a carrier pipe is used as outer pipe (2) and a thin-walled pipe made from a material which is resistant to abrasion and/or chemical action is used as inner pipe (3).
  2. Method according to Claim 1,
    characterized
    in that the circumferential contour of the pipe-in-pipe system (1) is aligned simultaneously with the application of the pressing pressure.
  3. Method according to one of the preceding claims,
    characterized
    in that plastic deformation is caused during the pressing operation.
  4. Use of the method according to one of the preceding claims for applying a thin-walled inner coating in a carrier pipe.
EP08802587.9A 2007-09-26 2008-09-25 Method for producing pipe-in-pipe systems Not-in-force EP2205371B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710045855 DE102007045855A1 (en) 2007-09-26 2007-09-26 Method of making pipe-in-pipe systems
PCT/EP2008/008114 WO2009043530A2 (en) 2007-09-26 2008-09-25 Method for producing pipe-in-pipe systems

Publications (2)

Publication Number Publication Date
EP2205371A2 EP2205371A2 (en) 2010-07-14
EP2205371B1 true EP2205371B1 (en) 2014-01-22

Family

ID=40417912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08802587.9A Not-in-force EP2205371B1 (en) 2007-09-26 2008-09-25 Method for producing pipe-in-pipe systems

Country Status (5)

Country Link
EP (1) EP2205371B1 (en)
DE (1) DE102007045855A1 (en)
DK (1) DK2205371T3 (en)
ES (1) ES2457850T3 (en)
WO (1) WO2009043530A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8117882B2 (en) 2004-12-21 2012-02-21 Bergrohr Gmbh Siegen Multi-layer pipe and method for its manufacture
DE102009060594A1 (en) 2009-12-23 2011-06-30 Eisenbau Krämer GmbH, 57223 pipe
DE102015000202A1 (en) * 2014-07-28 2016-01-28 Sosta Gmbh & Co. Kg Method for producing a multilayer pipe
DE102015108500A1 (en) * 2015-05-29 2016-12-01 Salzgitter Mannesmann Line Pipe Gmbh Method and device for producing bimetallic tubes
CN113664064A (en) * 2021-08-13 2021-11-19 山东钢铁集团日照有限公司 Method for manufacturing differential thickness pipe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102325A (en) 1936-06-09 1937-12-14 Boeing Aircraft Co Airplane control rod and method of making the same
JPS519926B1 (en) 1967-02-04 1976-03-31
JPS5141582B1 (en) 1968-03-29 1976-11-10
DE3232297C2 (en) * 1982-08-31 1985-05-09 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Method for connecting nested tubular parts of a heat exchanger and tool for carrying out the method

Also Published As

Publication number Publication date
DE102007045855A1 (en) 2009-04-09
DK2205371T3 (en) 2014-04-22
WO2009043530A3 (en) 2009-09-24
EP2205371A2 (en) 2010-07-14
ES2457850T3 (en) 2014-04-29
WO2009043530A2 (en) 2009-04-09

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