EP0509621A1 - Method and device for reovaling longitudinal seam welded tubes - Google Patents

Method and device for reovaling longitudinal seam welded tubes Download PDF

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Publication number
EP0509621A1
EP0509621A1 EP92250085A EP92250085A EP0509621A1 EP 0509621 A1 EP0509621 A1 EP 0509621A1 EP 92250085 A EP92250085 A EP 92250085A EP 92250085 A EP92250085 A EP 92250085A EP 0509621 A1 EP0509621 A1 EP 0509621A1
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EP
European Patent Office
Prior art keywords
tube
rolling
roller
stroke
pipe
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Granted
Application number
EP92250085A
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German (de)
French (fr)
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EP0509621B1 (en
Inventor
Klaus Keutmann
Franz Nicolai
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Vodafone GmbH
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Mannesmann AG
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Publication of EP0509621A1 publication Critical patent/EP0509621A1/en
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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 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead

Definitions

  • the invention relates to a method and a device for carrying out the method for the back ovalization of longitudinally welded, in particular austenitic and / or territical tubes after the weld thickening has been rolled in by means of an adjustable roll roller which deforms the weld seam against an internal support mandrel and which is mounted in a frame via one of the Length of the inner support mandrel corresponding section of the tube is moved and moved back to its starting position after completion of the rolling stroke.
  • Another known method is based on the rolling in of the thickened seam with the aid of a roller which is arranged so as to be adjustable in a rolling stand which is fixed with respect to the moving tube. Internal and lower support rollers are assigned to the roller.
  • a system based on the rolling process in which a roll stand that can be moved hydraulically in the longitudinal axis of the pipe is used, in which a roll roll is also hydraulically adjustable.
  • the weld seam is smoothed by the roller during a rolling stroke, the rolling stroke usually being carried out against the welding direction.
  • the roller presses the thickened seam against an inner mandrel arranged inside the tube, which advances non-positively to the tube at the welding speed.
  • the stand is hydraulically returned to the starting position with the roller open, while the inner mandrel is pulled back into its basic position.
  • the present invention is based on the object of creating a method for the back ovalization of longitudinally welded pipes after the weld thickening has been rolled in, which, even with smaller pipe diameters, with a relatively thick wall without internal lubrication of the mandrel or of the pipe is applicable.
  • a method is proposed according to the invention, which is characterized in that the tube ovalized when the weld seam is rolled out, after the completion of each rolling stroke, is simultaneously compressed over the entire length of the rolling stroke in the direction of the main axes of the oval tube cross section.
  • a device for carrying out the method according to the invention is characterized by two rulers arranged on both sides of the pipe along the roll stroke length, which can be pressed hydraulically against the pipe flanks with the contact surfaces adapted to the pipe circumference.
  • the rulers or roller strips are arranged outside the movement path of the stand supporting the roller.
  • the latter proposal makes it possible to return the stand with the roller to its starting position unhindered while the rulers or roller strips are being used.
  • FIG. 1 denotes the rolling roller, which is mounted so that it can be adjusted in the rolling stand 2.
  • a support roller 4 is arranged on the side of the tube labeled 3 opposite the roller roller 1, which supports the tube against the effective rolling forces.
  • the re-ovalization device according to the invention consists of a multiplicity of prism rollers, which are arranged one behind the other along the tube and are designated by 5, and which are arranged on one side of the tube 3 in a roller bar 6 (FIG. 2).
  • a pipe straightening device is provided, with which the welded pipe is straightened to such an extent that it can pass through the device according to the invention without interference.
  • a swirl stand 8 is provided on the outlet side of the arrangement according to the invention in order to prevent the pipe from twisting.
  • an inner mandrel 9 is provided in the interior of the tube 3, which is carried along by friction when the welded tube is advanced and is positioned between the roller 1 and the support roller 4 during the roller stroke inside the tube.
  • the rolling roller 1 and the support roller 4 can be seen as well as the prism rollers 5 which can be placed laterally on the flanks of the tube 3 and which together with the strips 6 supporting them can be moved hydraulically away from the tube 3 in the direction of the arrow 10 and towards the tube 3 are. As indicated by the double arrow 11, the roller 1 can be adjusted against the tube.
  • FIG. 4 roughly schematically indicates the rolling roller and supporting roller that can be moved in two directions of movement, the tube with the internal mandrel being shown in the area between the rolling roller 1 and the supporting roller 4.
  • a rolling stroke begins with the positioning of the roller 1 against the thickening of the weld seam of the continuous tube 3.
  • the rolling stroke takes place from the basic position A against or with the direction of passage of the tube 3.
  • the inner mandrel 9 moves non-positively with the advance of the tube 3.
  • the rolling stroke B dashed line
  • the roller is released.
  • the area of the tube 3 which is deformed flat oval by the rolling process is now rounded over the entire length of the rolling stroke by the setting of the lateral strips 6 with the prism rollers 5.
  • the inner mandrel 5 is thus free over the entire length and is retracted into its basic position while the framework 2 is returned to its starting position A with the roller 1 open.
  • the displacement of the inner mandrel 5 without lubrication is not critical because jamming no longer occurs in the tube, which is no longer oval and is rounded over its entire length corresponding to the mandrel. Only when the side strips 6 with their prismatic rollers open does the tube 3 form back into the flat oval shape in the elastic range and the inner mandrel runs non-positively at the beginning of the next rolling stroke.

Abstract

The invention relates to a method and a device for reovalling longitudinal seam welded tubes, in particular austenitic and/or ferritic tubes, after rolling in the weld-seam thickening by means of an adjustable roller which deforms the weld seam against an internal mandrel, is moved, mounted in a stand, over a section of the tube corresponding to the length of the internal mandrel, and is moved back to its starting position after completion of the rolling stroke. To provide a method and a device for reovalling longitudinal seam welded tubes after rolling in the weld-seam thickening, which method and device can be used without internal lubrication of the mandrel or tube even in the case of relatively small tube diameters with relatively thick walls, it is proposed that the tube which has been ovalled during the rolling-out of the weld seam is, after completion of each rolling stroke, simultaneously compressed over the entire rolling-stroke length in the direction of the main axes of the oval pipe cross-section. <IMAGE>

Description

Die Erfindung betrifft ein verfahren und eine Vorrichtung zur Durchführung des Verfahrens zum Rückovalisieren von längsnahtgeschweißten, insbesondere austenitischen und/oder territischen Rohren nach dem Einwalzen der Schweißnahtverdickung mittels einer anstellbaren, die Schweißnaht gegen einen innenliegenden Stützdorn verformenden Walzrolle, welche in einem Gerüst gelagert über einen der Länge des innenliegenden Stützdornes entsprechenden Abschnitt des Rohres bewegt und nach Abschluß des Walzhubes in ihre Ausgangsposition zurückbewegt wird.The invention relates to a method and a device for carrying out the method for the back ovalization of longitudinally welded, in particular austenitic and / or territical tubes after the weld thickening has been rolled in by means of an adjustable roll roller which deforms the weld seam against an internal support mandrel and which is mounted in a frame via one of the Length of the inner support mandrel corresponding section of the tube is moved and moved back to its starting position after completion of the rolling stroke.

Zum Einebnen der Nantverdickung, die bei der kontinuierlichen WIG- und Plasma-Längsnahtschweißung von austenitischen und ferritischen Edelstahlrohren entsteht, sind verschiedene verfahren bekannt. So erfolgt beispielsweise ein Einhämmern der Nahtverdickung nach verschiedenen Hämmerverfahren, wobei eine Arbeitsrolle radial gegen das durchlaufende Rohr im Nahtbereich geschlagen wird. Innenliegende, tonnenförmige Werkzeuge und gegenüber dem Hammerwerkzeug angeordnete Stützrollen ermoglichen eine Verringerung der Nahtverdickung in Abhängigkeit von der elastischen Rückfederung in der jeweiligen Rohrabmessung.Various methods are known for leveling the thickening of the edges, which is produced in the continuous TIG and plasma longitudinal seam welding of austenitic and ferritic stainless steel tubes. For example, the thickening of the seam is hammered in using various hammering methods, with a work roll being struck radially against the tube passing through in the seam region. Internal, barrel-shaped tools and support rollers arranged opposite the hammer tool enable the seam thickening to be reduced as a function of the elastic springback in the respective tube dimensions.

Ein anderes bekanntes Verfahren basiert auf dem Einwalzen der Nahtverdickung mit Hilfe einer Walzrolle, die in einem gegenüber dem bewegten Rohr feststehenden Walzgerüst anstellbar angeordnet ist. Der Walzrolle sind innenliegende sowie untere Stützrollen beigeordnet.Another known method is based on the rolling in of the thickened seam with the aid of a roller which is arranged so as to be adjustable in a rolling stand which is fixed with respect to the moving tube. Internal and lower support rollers are assigned to the roller.

Schließlich ist ein auf dem Einwalzverfahren basierendes System bekannt, bei dem ein in Rohr-Längsachse hydraulisch verfahrbares Walzgerüst Verwendung findet, in dem ebenfalls eine Walzrolle hydraulisch anstellbar gelagert ist. Die Schweißnaht wird während eines Walzhubes durch die Walzrolle geglättet, wobei der Walzhub üblicherweise entgegen der Schweißrichtung ausgeführt wird. Während des Walzens drückt die Walzrolle die Nahtverdickung gegen einen im Inneren des Rohres angeordneten Innendorn, der kraftschlüssig mit dem Rohr mit Schweißgeschwindigkeit vorläuft. Nach Beendigung des Arbeitshubes wird das Gerüst mit geoffneter Walzrolle hydraulisch in die Ausgangsposition zurückgebracht, wobei gleichzeitig der Innendorn in seine Grundposition zurückgezogen wird.Finally, a system based on the rolling process is known, in which a roll stand that can be moved hydraulically in the longitudinal axis of the pipe is used, in which a roll roll is also hydraulically adjustable. The weld seam is smoothed by the roller during a rolling stroke, the rolling stroke usually being carried out against the welding direction. During rolling, the roller presses the thickened seam against an inner mandrel arranged inside the tube, which advances non-positively to the tube at the welding speed. At the end of the working stroke, the stand is hydraulically returned to the starting position with the roller open, while the inner mandrel is pulled back into its basic position.

Beim Einwalzen der Nahtverdickung kommt es darauf an. daß das Spiel zwischen dem innenliegende Dorn und der Innenwandung des Rohres möglichst gering ist, um eine sichere Abstützung während des Walzens zu erzielen. Infolge der wirksamen Verformungskraft der Schweißnaht wird das bearbeitete Rohr in eine ovale Querschnittsform gedrückt, wodurch der mit geringem Spiel im Rohrinneren liegende Dorn eine Reibung an der Rohrinnenfläche erfährt. Das bekannte Verfahren ist nur mit einer Innenschmierung in einem eingeengten Rohrbereich mit günstigem Durchmesser/Wandstärkenverhältnis einsetzbar.When rolling in the seam thickening, it depends. that the play between the internal mandrel and the inner wall of the tube is as small as possible in order to achieve reliable support during rolling. As a result of the effective deformation force of the weld seam, the machined tube is pressed into an oval cross-sectional shape, as a result of which the mandrel lying with little play inside the tube is subject to friction the inner surface of the pipe. The known method can only be used with internal lubrication in a narrow pipe area with a favorable diameter / wall thickness ratio.

Um nach Beendigung des Einwalzens der Schweißnaht den Innendorn aus dem bearbeiteten Rohrabschnitt in seine Grundposition zurückziehen zu können, ist es bekannt, örtlich wirkende Reovalisierungsrollen einzusetzen. Mit Hilfe dieser Rollen soll durch Drucken des Rohres in seine kreisrunde Ausgangsquerschnittsform, der Innendorn von der Rohrinnenoberfläche befreit und damit rückziehbar gemacht werden. Dabei hat es sich als Nachteil herausgestellt, daß sich nach einer örtlichen Reovalisierung das Rohr im elastischen Bereich in eine ovale Querschnittsform zurückbildet, so daß es erneut zu einer Reibung zwischen Rohrinnenoberfläche und Dorn kommt, die das Zurückziehen des Dornes be- oder verhindern. Bei den erforderlich relativ großen Dornlängen führen derartige Aufschiebungen am Innendorn zu Beschädigungen der Rohrinnenoberfläche, auch bei innen geschmierten Rohren.In order to be able to withdraw the inner mandrel from the processed pipe section into its basic position after the rolling-in of the weld seam has ended, it is known to use locally acting re-ovalization rollers. With the help of these rollers, the inner mandrel should be freed from the inner surface of the tube and thus made retractable by printing the tube into its circular initial cross-sectional shape. It has turned out to be a disadvantage that after local re-ovalization, the tube in the elastic region reverts to an oval cross-sectional shape, so that there is again friction between the inner surface of the tube and the mandrel, which prevents or prevents the mandrel from being retracted. Given the relatively large mandrel lengths required, such postponements on the inner mandrel lead to damage to the inner surface of the tube, even with internally lubricated tubes.

Bei der Fahrweise ohne Innenschmierung führen kurze Werkzeugstandzeiten zu Produktionsunterbrechungen und schlechten Verbrauchsziffern.When driving without internal lubrication, short tool downtimes lead to production interruptions and poor consumption figures.

Der vorliegenden Erfindung liegt ausgehend von den geschilderten Problemen und Nachteilen die Aufgabe zugrunde, ein Verfahren zum Rückovalisieren von längsnahtgeschweißten Rohren nach dem Einwalzen der Schweißnahtverdickung zu schaffen, das bzw. die auch bei kleineren Rohrdurchmessern mit relativ dicker Wand ohne Innenschmierung des Dornes bzw. des Rohres anwendbar ist.Based on the problems and disadvantages described, the present invention is based on the object of creating a method for the back ovalization of longitudinally welded pipes after the weld thickening has been rolled in, which, even with smaller pipe diameters, with a relatively thick wall without internal lubrication of the mandrel or of the pipe is applicable.

Zur Lösung der Aufgabe wird erfindungsgemäß ein Verfahren vorgeschlagen, das dadurch gekennzeichnet ist, daß das beim Auswalzen der Schweißnaht ovalisierte Rohr nach Abschluß jedes Walzhubes gleichzeitig über die gesamte Walzhublänge in Richtung der Hauptachsen des ovalen Rohrquerschnittes zusammengedrückt wird. Durch diesen Verfahrensschritt, bei dem eine elastische Reovalisierung des gesamten während eines Walzhubes gewalzten Rohrbereiches gleichzeitig erfolgt, wird der Innendorn während der vorübergehenden Rohr-Rundung gelöst und kann beschädigungsfrei in eine Grundposition zurückgebracht werden.To achieve the object, a method is proposed according to the invention, which is characterized in that the tube ovalized when the weld seam is rolled out, after the completion of each rolling stroke, is simultaneously compressed over the entire length of the rolling stroke in the direction of the main axes of the oval tube cross section. Through this process step, in which an elastic re-ovalization of the entire pipe area rolled during a rolling stroke takes place simultaneously, the inner mandrel is released during the temporary pipe rounding and can be returned to a basic position without damage.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist gekennzeichnet durch zwei beidseitig des Rohres entlang der Walzhublänge angeordnete Lineale, die mit dem Rohrumfang angepaßten Anlageflächen hydraulisch gegen die Rohrflanken pressbar sind.A device for carrying out the method according to the invention is characterized by two rulers arranged on both sides of the pipe along the roll stroke length, which can be pressed hydraulically against the pipe flanks with the contact surfaces adapted to the pipe circumference.

Alternativ und gleichwertig kann nach einem anderen Vorschlag der Erfindung vorgesehen sein, entlang der Walzhublänge beidseitig des Rohres zwei Rollenleisten anzuordnen, deren im Abstand hintereinander entlang dem Rohr angeordnete Rollen mit ihren entsprechend geformten Umfangskonturen hydraulisch gegen die Rohrflanken pressbar sind.As an alternative and equivalent, it can be provided according to another proposal of the invention to arrange two roller strips along the roll stroke length on both sides of the tube, the rollers of which are arranged one behind the other along the tube and can be pressed hydraulically against the tube flanks with their correspondingly shaped peripheral contours.

Nach einem bevorzugten Merkmal der Erfindung ist vorgesehen, daß die Lineale oder Rollenleisten außerhalb der Bewegungsbahn des die Walzrolle lagernden Gerüstes angeordnet sind. Durch letzteren Vorschlag wird es ermöglicht, während des Einsatzes der Lineale oder Rollenleisten das Gerüst mit der Walzrolle unbehindert in seine Ausgangsposition zurückzuführen.According to a preferred feature of the invention, it is provided that the rulers or roller strips are arranged outside the movement path of the stand supporting the roller. The latter proposal makes it possible to return the stand with the roller to its starting position unhindered while the rulers or roller strips are being used.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:

Fig. 1
grob schematisch die Ansicht einer erfindungsgemäßen Reovalisierungsvorrichtung,
Fig. 2
die Draufsicht auf die Einrichtung nach Figur 1,
Fig. 3
einen Querschnitt durch das Rohr im Bereich des Gerüstes mit Walzrolle und
Fig. 4
einen Querschnitt durch die Walzrolle im Verformungszustand.
An embodiment of the invention is shown in the drawing and is described below. It shows:
Fig. 1
roughly schematic view of a revalidation device according to the invention,
Fig. 2
the top view of the device of Figure 1,
Fig. 3
a cross section through the tube in the area of the stand with roller and
Fig. 4
a cross section through the roller in the deformation state.

Die Zeichnungen werden nachfolgend anhand der Funktionsweise der erfindungsgemäßen Vorrichtung erläutert:
In Figur 1 ist mit 1 die Walzrolle bezeichnet, die in dem Walzgerüst 2 anstellbar gelagert ist. Auf der der Walzrolle 1 gegenüberliegenden Seite des mit 3 bezeichneten Rohres ist eine Stützrolle 4 angeordnet, die das Rohr gegen die wirksamen Walzkräfte abstützt. Die erfindungsgemäße Reovalisierungseinrichtung besteht aus einer Vielzahl von hintereinander längs des Rohres angeordneten, mit 5 bezeichneten Prismenrollen, die in einer Rollenleiste 6 (Figur 2) beiseitig des Rohres 3 angeordnet sind. Am Einlauf der Reovalisierungseinrichtung ist bei 7 angedeutet eine Rohrrichteinrichtung vorgesehen, mit der das geschweißte Rohr soweit geradegerichtet wird, daß es störungsfrei die erfindungsgemäße Einrichtung durchlaufen kann. Ein Entdrallgerüst 8 ist auslaufseitig der erfindungsgemäßen Einordnung vorgesehen, um ein Verdrallen des Rohres zu verhindern.The drawings are explained below using the mode of operation of the device according to the invention:
In FIG. 1, 1 denotes the rolling roller, which is mounted so that it can be adjusted in the rolling stand 2. A support roller 4 is arranged on the side of the tube labeled 3 opposite the roller roller 1, which supports the tube against the effective rolling forces. The re-ovalization device according to the invention consists of a multiplicity of prism rollers, which are arranged one behind the other along the tube and are designated by 5, and which are arranged on one side of the tube 3 in a roller bar 6 (FIG. 2). At the inlet of the revalidation device, indicated at 7, a pipe straightening device is provided, with which the welded pipe is straightened to such an extent that it can pass through the device according to the invention without interference. A swirl stand 8 is provided on the outlet side of the arrangement according to the invention in order to prevent the pipe from twisting.

Wie in Figur 2 erkennbar, ist im Inneren des Rohres 3 ein Innendorn 9 vorgesehen, der über Reibschluß beim Vorschub des geschweißten Rohres mitgenommen wird und zwischen der Walzrolle 1 und der Stützrolle 4 während des Walzhubes im Rohrinneren positioniert ist.As can be seen in FIG. 2, an inner mandrel 9 is provided in the interior of the tube 3, which is carried along by friction when the welded tube is advanced and is positioned between the roller 1 and the support roller 4 during the roller stroke inside the tube.

In Figur 3 sind die Walzrolle 1 und die Stützrolle 4 ebenso erkennbar, wie die seitlich an die Flanken des Rohres 3 anlegbaren Prismenrollen 5, die zusammen mit den sie lagernden Leisten 6 in Pfeilrichtung 10 hydraulisch vom Rohr 3 weg und auf das Rohr 3 hin bewegbar sind. Wie mit dem Doppelpfeil 11 angedeutet, ist die Walzrolle 1 gegen das Rohr anstellbar.In Figure 3, the rolling roller 1 and the support roller 4 can be seen as well as the prism rollers 5 which can be placed laterally on the flanks of the tube 3 and which together with the strips 6 supporting them can be moved hydraulically away from the tube 3 in the direction of the arrow 10 and towards the tube 3 are. As indicated by the double arrow 11, the roller 1 can be adjusted against the tube.

Figur 4 deutet grob schematisch die in zwei Bewegungsrichtungen bewegbare Walzrolle und Stutzrolle an, wobei im Bereich zwischen Walzrolle 1 und Stützrolle 4 das Rohr mit dem innenliegenden Dorn dargestellt ist.FIG. 4 roughly schematically indicates the rolling roller and supporting roller that can be moved in two directions of movement, the tube with the internal mandrel being shown in the area between the rolling roller 1 and the supporting roller 4.

Die erfindungsgemäße Einrichtung arbeitet wie folgt:
Ein Walzhub beginnt mit dem Anstellen der Walzrolle 1 gegen die Schweißnahtverdickung des durchlaufenden Rohres 3. Der Walzhub erfolgt aus der Grundposition A gegen die oder mit der Durchlaufrichtung des Rohres 3. Hierbei bewegt sich der Innendorn 9 kraftschlüssig mit dem Vorschub des Rohres 3. Am Ende des Walzhubes B (gestrichelte Darstellung) wird die Walzrolle gelöst. Der durch den Walzvorgang flach oval verformte Bereich des Rohres 3 wird nun durch das Anstellen der seitlichen Leisten 6 mit den Prismenrollen 5 über die gesamte Länge des Walzhubes gerundet. Der Innendorn 5 wird so über die gesamte Länge frei und wird in seine Grundposition zurückgezogen, während das Gerüst 2 mit geöffneter Walzrolle 1 in seine Ausgangspositon A zurückgebracht wird. Das Verschieben des Innendorns 5 ohne Schmierung ist unkritisch, weil ein Verklemmen in dem auf seiner ganzen, dem Dorn entsprechenden Länge gerundeten, nicht mehr ovalen Rohr nicht mehr vorkommt. Erst mit dem Öffnen der seitlichen Leisten 6 mit ihren Prismenrollen formt sich das Rohr 3 im elastischen Bereich in die flach ovale Form zurück und der Innendorn läuft mit Beginn des nächsten Walzhubes kraftschlussig vor.The device according to the invention works as follows:
A rolling stroke begins with the positioning of the roller 1 against the thickening of the weld seam of the continuous tube 3. The rolling stroke takes place from the basic position A against or with the direction of passage of the tube 3. Here, the inner mandrel 9 moves non-positively with the advance of the tube 3. At the end the rolling stroke B (dashed line) the roller is released. The area of the tube 3 which is deformed flat oval by the rolling process is now rounded over the entire length of the rolling stroke by the setting of the lateral strips 6 with the prism rollers 5. The inner mandrel 5 is thus free over the entire length and is retracted into its basic position while the framework 2 is returned to its starting position A with the roller 1 open. The displacement of the inner mandrel 5 without lubrication is not critical because jamming no longer occurs in the tube, which is no longer oval and is rounded over its entire length corresponding to the mandrel. Only when the side strips 6 with their prismatic rollers open does the tube 3 form back into the flat oval shape in the elastic range and the inner mandrel runs non-positively at the beginning of the next rolling stroke.

Gegenüber dem Stand der Technik mit nur örtlicher Reovalisierung wird erreicht, daß das erforderliche Lösen des Dornes 5 über die gesamte Dornlänge gleichzeitig erreicht wird, so daß auf die beim Stand der Technik notwendige Schmierung des Innenrohres bzw. Dornes verzichtet werden kann.Compared to the prior art with only local re-ovalization, the required loosening of the mandrel 5 is achieved simultaneously over the entire mandrel length, so that the lubrication of the inner tube or mandrel required in the prior art can be dispensed with.

Claims (4)

Verfahren zum Rückovalisieren von längsnahtgeschweißten, insbesondere austenitischen und/oder ferritischen Rohren nach dem Einwalzen der Schweißnahtverdickung mittels einer anstellbaren, die Schweißnaht gegen einen innenliegenden Stützdorn verformenden Walzrolle, welche in einem Gerüst gelagert über einen der Länge des innenliegenden Stützdornes entsprchenden Abschnitt des Rohres bewegt und nach Abschluß des Walzhubes in ihre Ausgangsposition zurückbewegt wird,
dadurch gekennzeichnet,
daß das beim Auswalzen der Schweißnaht ovalisierte Rohr nach Abschluß jedes Walzhubes gleichzeitig über die gesamte Walzhublänge in Richtung der Hauptachsen des ovalen Rohrquerschnittes zusammengedrückt wird.Method for the back ovalization of longitudinally welded, in particular austenitic and / or ferritic, pipes after the weld thickening has been rolled in by means of an adjustable roller which deforms the weld seam against an internal support mandrel and which is stored in a frame and moved over a section of the pipe corresponding to the length of the internal support mandrel Completion of the rolling stroke is moved back to its starting position,
characterized,
that the tube ovalized when rolling out the weld seam is pressed together at the end of each rolling stroke over the entire length of the rolling stroke in the direction of the main axes of the oval tube cross section. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1,
gekennzeichnet durch
zwei beidseitig des Rohres (3) entlang der Walzhublänge angeordnete Lineale (6), die mit dem Rohrumfang angepaßten Anlageflächen mechanisch oder hydraulisch gegen die Rohrflanken pressbar sind.Device for carrying out the method according to claim 1,
marked by
two rulers (6) arranged on both sides of the pipe (3) along the roll stroke length, which can be pressed mechanically or hydraulically against the pipe flanks with the pipe surfaces adapted to the pipe circumference. Vorrichtung nach Anspruch 1,
gekennzeichnet durch
zwei beidseitig des Rohres (3) entlang der Walzhublänge angeordneten Rollenleisten (6), deren im Abstand hintereinander entlang dem Rohr angeordnete Rollen (5) mit ihren Umfangskonturen mechanisch oder hydraulisch gegen die Rohrflanken pressbar sind.Device according to claim 1,
marked by
two roller strips (6) arranged on both sides of the tube (3) along the roll stroke length, the rollers (5) of which are arranged at a distance one behind the other along the tube and can be pressed mechanically or hydraulically against the tube flanks with their peripheral contours. Vorrichtung nach Anspruch 2 und 3,
dadurch gekennzeichnet,
daß die Lineale oder Rollenleisten (6) außerhalb der Bewegungsbann des die Walzrolle (1) lagernden Gerüstes (2) angeordnet sind.Device according to claims 2 and 3,
characterized,
that the rulers or roller strips (6) are arranged outside the range of motion of the stand (2) supporting the roller (1).
EP92250085A 1991-04-16 1992-04-13 Method and device for reovaling longitudinal seam welded tubes Expired - Lifetime EP0509621B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4112740 1991-04-16
DE4112740A DE4112740A1 (en) 1991-04-16 1991-04-16 METHOD AND DEVICE FOR BACKVALIZING TUBE-WELDED TUBES

Publications (2)

Publication Number Publication Date
EP0509621A1 true EP0509621A1 (en) 1992-10-21
EP0509621B1 EP0509621B1 (en) 1995-01-04

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ID=6429891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92250085A Expired - Lifetime EP0509621B1 (en) 1991-04-16 1992-04-13 Method and device for reovaling longitudinal seam welded tubes

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EP (1) EP0509621B1 (en)
DE (2) DE4112740A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050559A1 (en) * 2007-10-16 2009-04-23 Imec Tubes S.P.A. Apparatus for reducing a weld bead
CN109277430A (en) * 2018-10-30 2019-01-29 宝鸡石油钢管有限责任公司 A kind of sledge dressization spiral submerged welded pipe production line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH229659A (en) * 1941-01-31 1943-11-15 Kronprinz Ag Method and device for tempering and testing the weld seam on longitudinally welded pipes.
US3590622A (en) * 1968-12-18 1971-07-06 Ernest N Calhoun Apparatus for making tubing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH229659A (en) * 1941-01-31 1943-11-15 Kronprinz Ag Method and device for tempering and testing the weld seam on longitudinally welded pipes.
US3590622A (en) * 1968-12-18 1971-07-06 Ernest N Calhoun Apparatus for making tubing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050559A1 (en) * 2007-10-16 2009-04-23 Imec Tubes S.P.A. Apparatus for reducing a weld bead
CN109277430A (en) * 2018-10-30 2019-01-29 宝鸡石油钢管有限责任公司 A kind of sledge dressization spiral submerged welded pipe production line

Also Published As

Publication number Publication date
DE4112740A1 (en) 1992-10-22
DE4112740C2 (en) 1993-06-09
EP0509621B1 (en) 1995-01-04
DE59201114D1 (en) 1995-02-16

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