EP3554731B1 - Apparatus and method for producing a peripheral groove in an end portion of a metal tube - Google Patents

Apparatus and method for producing a peripheral groove in an end portion of a metal tube Download PDF

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Publication number
EP3554731B1
EP3554731B1 EP17816788.8A EP17816788A EP3554731B1 EP 3554731 B1 EP3554731 B1 EP 3554731B1 EP 17816788 A EP17816788 A EP 17816788A EP 3554731 B1 EP3554731 B1 EP 3554731B1
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EP
European Patent Office
Prior art keywords
roller
tube
rollers
pipe
spacing
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EP17816788.8A
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German (de)
French (fr)
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EP3554731A1 (en
Inventor
Andreas Rönpagel
Jan Ehlers
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Mv Pipe Technologies GmbH
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Mv Pipe Technologies GmbH
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Publication of EP3554731A1 publication Critical patent/EP3554731A1/en
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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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/18—Rolls or rollers

Definitions

  • the invention relates to a device for producing a circumferential groove in an end section of a metal pipe, in particular a metal pipe to be coated on the inside, wherein the groove is designed to receive pipe connectors, with a first rotationally driven roller, a second, freely rotating roller, wherein the first roller has a roughened or structured surface relative to the second roller, a pressing device for producing a relative movement between the first and second rollers, between a first and second position, wherein the rollers in the first position assume a first distance from one another which allows a wall of the pipe to be inserted between the rollers, and in the second position assume a smaller, second distance from one another which is less than a material thickness in the wall of the pipe.
  • the invention further relates to a method for producing a circumferential groove in an end section of a metal pipe, in particular a metal pipe to be coated on the inside, wherein the groove is designed to receive pipe connectors.
  • Pipes of the type described above are used in industrial plants for a wide range of purposes, but especially in fire extinguishing systems. In such plants, piping systems are used that sometimes have to cover long distances.
  • One-piece pipes cannot always be used for this, but rather pipelines must be formed from several pipes put together.
  • Pipe connectors In order to connect pipes to one another at the ends, these are connected with Pipe connectors are coupled together.
  • circumferential grooves are made in the outer circumferential surface of the metal pipes in the known manner described above. As a result of the first and second rollers pressing against each other, a pressing force is exerted on the metal pipe, which makes it possible to press a groove into the pipe by deforming the metal pipe, and for this purpose the pipe is rotated by the driven roller.
  • the structured surface of the driven roller which is necessary to generate sufficient static friction, can, under high contact forces, which are necessary for certain material thicknesses of the metal pipes, press a negative structure corresponding to the structuring into the wall of the roller. An irregularity in the surface of the metal pipe is then unintentionally formed at the corresponding point where the driven roller was previously located. This can prove to be disadvantageous for subsequent coating processes on the metal pipe. Corrosion resistance on the inside of the metal pipes is a critical requirement, particularly in media-carrying systems, such as fire extinguishing systems. Roughening the surface at the point of the driven roller on the inside of the pipe reduces the possibility of forming an adequate corrosion-inhibiting layer. This is considered to be in need of improvement.
  • a device for roll forming pipe elements according to the preamble of claim 1 is known.
  • the first, driven roller engages with its roughened surface on the inside of the pipe to be processed.
  • the free-running roller is moved by means of an actuator transversely to the rotation axis of the first roller.
  • CN 105 382 067 A relates to a device for reinforcing a pipe by means of a rib directed outwards at the end of the pipe.
  • the device comprises a first free-running shaft 4 arranged on the inside of the pipe and a second driven shaft 7 arranged on the outside of the pipe.
  • the free-running shaft 4 is moved by means of a sliding seat transversely to the axis of rotation of the driven shaft.
  • the invention was based on the object of improving the device of the type described at the outset in such a way that the disadvantages mentioned above are mitigated or overcome as far as possible.
  • the invention was based on the object of improving the device in such a way that the Possibility for subsequent internal coating of the grooved metal pipes is improved.
  • the invention solves the underlying problem in a device of the type described at the outset by designing it with the features of claim 1.
  • the first, driven roller is placed on the outer circumferential surface of the pipe in the second position and is designed to grip and rotate the pipe from the outside, so that a circumferential groove is pressed into the pipe in the second position when the first roller is driven, the pressing device being designed to move the first, driven roller transversely to its axis of rotation.
  • the invention follows the approach of not letting the driven roller rotate on the inside of the metal pipe, as in the prior art, but rather placing the roller on the pipe from the outside and applying the structuring to the outer circumferential surface of the pipe.
  • a structuring is then embossed into the circumferential surface of the pipe with sufficiently high pressing forces, this structuring is outside the inner pipe area to be coated and does not further impair the formation of a corresponding coating. Roughness in the circumferential groove on the outside of the pipe does not have a detrimental effect on the absorption capacity of a pipe connector and can therefore be accepted.
  • the first and second rollers are aligned parallel to one another, with the structuring of the surface preferably being formed by means of grooving or knurling. Furthermore, the relative movement of the first and second rollers preferably takes place transversely to the axis of rotation of the pipe.
  • the device has exactly two rollers. Compared to devices known from the prior art, which sometimes had a larger number of rollers, this is a significant structural simplification, which at the same time does not result in any deterioration in the repeatability of the groove contour.
  • the second roller has a greater width than the first roller.
  • the first roller is aligned centrally with respect to the second roller in the direction of its axis of rotation.
  • the second roller has, preferably centrally in the direction of its axis of rotation, a circumferential recess which is dimensioned such that the first roller can guide the pipe located between the rollers in the second position into the recess.
  • the width of the recess preferably exceeds the width of the first roller by at least twice the material thickness of the pipe.
  • the width of the recess of the second roller particularly preferably exceeds the width of the first roller such that the first roller and the second roller in the second position define a gap with the contour of the circumferential groove.
  • those peripheral edges of the first roller and/or the second roller that are in contact with the pipe in the second position are rounded. This reduces stress peaks in the material of the pipe, which has a positive effect on the fatigue strength and corrosion resistance of the pipe, and also reduces wear on the first and second rollers.
  • the other roller is fixed relative to the axis of rotation of the metal tube.
  • the invention achieves the object formulated at the outset in a method of the type described at the outset with the following steps: Providing a first, rotationally driven roller and a second, freely rotating roller in a first position, wherein the rollers in the first position assume a first distance from one another which allows a wall of the pipe to be inserted between the rollers, inserting the wall between the first roller and the second roller, generating a relative movement between the first and second rollers from the first to a second position in which the rollers assume a smaller, second distance from one another which is less than a material thickness of the wall of the pipe, wherein the gripping and rotation of the pipe by means of the first driven roller in the second position takes place from outside, wherein the first roller has a roughened or structured surface relative to the second roller, so that a circumferential groove is pressed into the pipe in the second position, wherein the relative movement between the first and second roller
  • the method according to the invention furthermore has the same advantages and preferred embodiments as the device according to the invention described above.
  • the method is further developed by the following step: pressing the pipe located between the rollers in the second position into a recess which runs around the second roller, preferably centrally in the direction of its axis of rotation, by means of the first roller, preferably into a gap with the contour of the circumferential groove defined between the first roller and the second roller in the second position.
  • the method according to the second aspect of the invention may be part of a method not forming part of the invention for coating the inside of a pipe and may comprise the following steps: Cleaning the pipe, in particular by means of one, several or all of the following measures: degreasing, rinsing, in particular with deionised water, pickling;
  • the coating material is preferably a water-based autodeposition material, with polyvinylidene chloride (PVDC) or epoxy-acrylic-urethane being particularly preferably used as the resin.
  • the coating process is preferably carried out by adding a dispersion containing an acid, for example FeF 3 iron fluoride, and paint particles, with the acid, for example the FeF 3 iron fluoride, causing Fe 2+ ions to be released on the inside surface of the metal pipe, which combine with the paint particles and then re-attach to the inside surface of the metal pipe.
  • the coating material described above is, for example, the BONDERITE TM M-PP material (formerly Aquence TM ) developed by Henkel in Düsseldorf, Germany.
  • Figure 1 is a device 1 for producing a circumferential groove 101 ( Fig.2 ) in a metal tube 100.
  • the device has a first roller 3 and a second roller 5, the first roller 3 being driven in rotation, while the second roller 5 is preferably mounted so as to rotate freely.
  • the first, driven roller 3 is mounted by means of a first bearing 17, while the second roller 5 is mounted by means of a second bearing 11.
  • the first roller 3 is connected to a drive unit 7 by means of a drive means 9, for example a drive chain or a drive belt or toothed belt.
  • the first roller 3 is preferably driven by an electric motor, wherein the electric motor can then be arranged directly on the housing with the device 1, which also carries the bearing 17.
  • the freely rotating roller 5 is arranged on a support structure 13, while the first, driven roller 3 is arranged on a pressing device 15.
  • the pressing device 15 is movable relative to the support structure 13. This relative movement causes the first, driven roller 3 to be moved relative to the second, freely rotating roller 5 transversely to a rotation axis R of the metal tube 100.
  • the first roller 3 is rotationally driven and movable about a rotation axis A.
  • the width of the second roller 5 exceeds the width of the first roller 3 in the direction of the rotation axis A, or the rotation axis R of the metal tube 100, or in the direction of the rotation axis F of the freely rotating roller 5. Furthermore, the second roller 5 has a recess 19 on its peripheral surface, which exceeds the width of the first roller 3 to such an extent that a gap 21 is formed between the first and the second roller 3, 5 when the first roller 3 has moved from a first position to the second position shown in the figures.
  • the first and second rollers 3, 5 are far enough apart in the first position (not shown) that the metal tube 100 with its material thickness M can be guided through between the rollers 3, 5 in order to be arranged with an end section 103 between the rollers 3, 5. If the tube 100 with its end section 103 is arranged accordingly, the first roller 3 is rotated and pressed against the second roller 5 by means of the pressing device 15, so that the material of the metal tube 100 is pressed into the gap 21 between the rollers 3, 5, whereby a groove 101 is created on the outside in the end section 103 of the metal tube.
  • the structuring of the surface 6 of the first roller 3 required for rotating the pipe 100 is thus pressed exclusively onto the outer circumferential surface of the pipe 100, so that the inner surface of the pipe 100 can remain completely smooth, particularly in the end section 103, with the exception of the protrusion of the groove 101 into the interior.
  • the subsequent application of a corrosion protection layer or other coating is possible without restriction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Erzeugen einer umlaufenden Nut in einem Endabschnitt eines Metallrohres, insbesondere eines innen zu beschichtenden Metallrohres, wobei die Nut zur Aufnahme von Rohrverbindern eingerichtet ist, mit einer ersten rotatorisch angetriebenen Rolle, einer zweiten, freidrehenden, Rolle, wobei die erste Rolle relativ zu der zweiten Rolle eine aufgeraute oder strukturierte Oberfläche aufweist, eine Andrückeinrichtung zum Erzeugen einer Relativbewegung zwischen der ersten und zweiten Rolle, zwischen einer ersten und zweiten Position, wobei die Rollen in der ersten Position einen ersten Abstand zueinander einnehmen, der ein Einführen einer Wandung des Rohres zwischen die Rollen erlaubt, und in der zweiten Position einen geringeren, zweiten Abstand zueinander einnehmen, der geringer als eine Materialstärke in der Wandung des Rohres ist.The invention relates to a device for producing a circumferential groove in an end section of a metal pipe, in particular a metal pipe to be coated on the inside, wherein the groove is designed to receive pipe connectors, with a first rotationally driven roller, a second, freely rotating roller, wherein the first roller has a roughened or structured surface relative to the second roller, a pressing device for producing a relative movement between the first and second rollers, between a first and second position, wherein the rollers in the first position assume a first distance from one another which allows a wall of the pipe to be inserted between the rollers, and in the second position assume a smaller, second distance from one another which is less than a material thickness in the wall of the pipe.

Die Erfindung betrifft ferner ein Verfahren zum Erzeugen einer umlaufenden Nut in einem Endabschnitt eines Metallrohres, insbesondere eines innen zu beschichtenden Metallrohres, wobei die Nut zur Aufnahme von Rohrverbindern eingerichtet ist.The invention further relates to a method for producing a circumferential groove in an end section of a metal pipe, in particular a metal pipe to be coated on the inside, wherein the groove is designed to receive pipe connectors.

Rohre der vorstehend beschriebenen Art werden in Industrieanlagen für verschiedenste Einsatzzwecke, insbesondere aber auch in Feuerlöschanlagen eingesetzt. In solchen Anlagen kommen Rohrleitungssysteme zum Einsatz, mit denen teils große Wegstrecken überbrückt werden müssen. Hierfür können nicht immer einstückige Rohre verwendet werden, sondern es müssen Rohrleitungen aus mehreren aneinandergesetzten Rohren gebildet werden. Um Rohre endseitig miteinander zu verbinden, werden diese mit Rohrverbindern aneinander gekoppelt. Damit die Rohrverbinder verliersicher und zuverlässig auf den Rohren montiert werden können, werden in vorstehend beschriebener, bekannter Weise umlaufende Nuten in die äußere Umfangsfläche der Metallrohre eingebracht. Infolge des Andrückens der ersten und zweiten Rollen aneinander wird eine Anpresskraft auf das Metallrohr ausgeübt, die es ermöglicht, durch Verformung des Metallrohres eine Nut in das Rohr einzupressen und hierzu wird das Rohr durch die angetriebene Rolle gedreht.Pipes of the type described above are used in industrial plants for a wide range of purposes, but especially in fire extinguishing systems. In such plants, piping systems are used that sometimes have to cover long distances. One-piece pipes cannot always be used for this, but rather pipelines must be formed from several pipes put together. In order to connect pipes to one another at the ends, these are connected with Pipe connectors are coupled together. In order for the pipe connectors to be securely and reliably mounted on the pipes, circumferential grooves are made in the outer circumferential surface of the metal pipes in the known manner described above. As a result of the first and second rollers pressing against each other, a pressing force is exerted on the metal pipe, which makes it possible to press a groove into the pipe by deforming the metal pipe, and for this purpose the pipe is rotated by the driven roller.

Die zum Erzeugen einer ausreichenden Haftreibung notwendige strukturierte Oberfläche der angetriebenen Rolle kann bei entsprechend hohen Anpresskräften, die bei bestimmten Materialstärken der Metallrohre notwendig werden, eine mit der Strukturierung korrespondierende Negativstruktur in die Wandung der Rolle eindrücken. An der entsprechenden Stelle, an der zuvor die angetriebene Rolle saß, wird dann eine Unregelmäßigkeit in der Oberfläche des Metallrohrs ungewollt ausgebildet. Dies kann sich für nachfolgende Beschichtungsvorgänge des Metallrohrs als nachteilig erweisen. Insbesondere in medienführenden Anlagen, beispielsweise Feuerlöschanlagen, ist die Korrosionsbeständigkeit auf der Innenseite der Metallrohre eine kritische Anforderung. Eine Aufrauhung der Oberfläche an der Stelle der angetriebenen Rolle auf der Rohrinnenseite verschlechtert die Möglichkeit der Ausbildung einer adäquaten korrosionshemmenden Schicht. Dies wird als verbesserungswürdig angesehen.The structured surface of the driven roller, which is necessary to generate sufficient static friction, can, under high contact forces, which are necessary for certain material thicknesses of the metal pipes, press a negative structure corresponding to the structuring into the wall of the roller. An irregularity in the surface of the metal pipe is then unintentionally formed at the corresponding point where the driven roller was previously located. This can prove to be disadvantageous for subsequent coating processes on the metal pipe. Corrosion resistance on the inside of the metal pipes is a critical requirement, particularly in media-carrying systems, such as fire extinguishing systems. Roughening the surface at the point of the driven roller on the inside of the pipe reduces the possibility of forming an adequate corrosion-inhibiting layer. This is considered to be in need of improvement.

Aus WO 2016/032707 A1 ) ist eine Vorrichtung zum Rollformen von Rohrelementen gemäß dem Oberbegriff von Anspruch 1 bekannt. Die erste, angetriebene Rolle greift mit ihrer aufgerauten Oberfläche an der Innenseite des zu bearbeitenden Rohres an. Die freilaufende Rolle wird mittels eines Aktuators quer zur Rotationsachse der erste Rolle bewegt.Out of WO 2016/032707 A1 ) a device for roll forming pipe elements according to the preamble of claim 1 is known. The first, driven roller engages with its roughened surface on the inside of the pipe to be processed. The free-running roller is moved by means of an actuator transversely to the rotation axis of the first roller.

CN 105 382 067 A ) betrifft eine Vorrichtung zum Verstärken eines Rohres mittels einer am Ende des Rohres nach außen gerichteten Rippe. Die Vorrichtung umfasst eine erste freilaufende Welle 4, angeordnet auf der Innenseite des Rohres, und eine zweite angetriebene Welle 7, angeordnet auf der Außenseite des Rohres. Die freilaufende Welle 4 wird mittels eines Schiebesitzes quer zur Rotationsachse der angetriebenen Welle bewegt. CN 105 382 067 A ) relates to a device for reinforcing a pipe by means of a rib directed outwards at the end of the pipe. The device comprises a first free-running shaft 4 arranged on the inside of the pipe and a second driven shaft 7 arranged on the outside of the pipe. The free-running shaft 4 is moved by means of a sliding seat transversely to the axis of rotation of the driven shaft.

Vor diesem Hintergrund lag der Erfindung die Aufgabe zugrunde, die Vorrichtung der eingangs bezeichneten Art dahingehend zu verbessern, dass die vorstehend erwähnten Nachteile möglichst weitgehend abgemildert, bzw. überwunden werden. Insbesondere lag der Erfindung die Aufgabe zugrunde, die Vorrichtung dahingehend zu verbessern, dass die Möglichkeit zur nachfolgenden Innenbeschichtung der mit Nut versehenen Metallrohre verbessert wird.Against this background, the invention was based on the object of improving the device of the type described at the outset in such a way that the disadvantages mentioned above are mitigated or overcome as far as possible. In particular, the invention was based on the object of improving the device in such a way that the Possibility for subsequent internal coating of the grooved metal pipes is improved.

Die Erfindung löst die ihr zugrunde liegende Aufgabe bei einer Vorrichtung der eingangs bezeichneten Art, indem diese mit den Merkmalen von Anspruch 1 ausgebildet ist. Erfindungsgemäß ist die erste, angetriebene Rolle in der zweiten Position an der äußeren Umfangsfläche des Rohres aufgesetzt und dazu eingerichtet, das Rohr von außerhalb zu erfassen und zu drehen, sodass in das Rohr in der zweiten Position bei Antrieb der ersten Rolle eine umlaufende Nut eingepresst wird, wobei die Andrückeinrichtung dazu eingerichtet ist, die erste, angetriebene Rolle quer zu ihrer Rotationsachse zu bewegen. Die Erfindung folgt hierbei dem Ansatz, die angetriebene Rolle nicht, wie im Stand der Technik, auf der Innenseite des Metallrohres umlaufen zu lassen, sondern die Rolle von außen auf das Rohr aufzusetzen und die Strukturierung auf der äußeren Umfangsfläche des Rohres anzusetzen. Sollte es bei entsprechend hohen Presskräften dann zum Einprägen einer Strukturierung in die Umfangsfläche des Rohres kommen, so liegt diese Strukturierung außerhalb des zu beschichtenden inneren Rohrbereiches und beeinträchtigt die Ausbildung einer entsprechenden Beschichtung nicht weiter. Eine Rauheit in der umlaufenden Nut in der Außenseite des Rohres wirkt sich nicht nachteilig auf die Aufnahmefähigkeit eines Rohrverbinders aus und kann daher in Kauf genommen werden.The invention solves the underlying problem in a device of the type described at the outset by designing it with the features of claim 1. According to the invention, the first, driven roller is placed on the outer circumferential surface of the pipe in the second position and is designed to grip and rotate the pipe from the outside, so that a circumferential groove is pressed into the pipe in the second position when the first roller is driven, the pressing device being designed to move the first, driven roller transversely to its axis of rotation. The invention follows the approach of not letting the driven roller rotate on the inside of the metal pipe, as in the prior art, but rather placing the roller on the pipe from the outside and applying the structuring to the outer circumferential surface of the pipe. If a structuring is then embossed into the circumferential surface of the pipe with sufficiently high pressing forces, this structuring is outside the inner pipe area to be coated and does not further impair the formation of a corresponding coating. Roughness in the circumferential groove on the outside of the pipe does not have a detrimental effect on the absorption capacity of a pipe connector and can therefore be accepted.

Vorzugsweise sind die erste und zweite Rolle parallel zueinander ausgerichtet, wobei die Strukturierung der Oberfläche vorzugsweise mittels einer Rillierung oder Rändelung ausgebildet ist. Weiter vorzugsweise erfolgt die Relativbewegung der ersten und zweiten Rollen quer zur Rotationsachse des Rohres.Preferably, the first and second rollers are aligned parallel to one another, with the structuring of the surface preferably being formed by means of grooving or knurling. Furthermore, the relative movement of the first and second rollers preferably takes place transversely to the axis of rotation of the pipe.

In einer bevorzugten Weiterbildung weist die Vorrichtung exakt zwei Rollen auf. Gegenüber Vorrichtungen, die aus dem Stand der Technik bekannt waren und teilweise eine größere Anzahl Rollen aufwiesen, ist dies eine deutliche konstruktive Vereinfachung, die gleichzeitig keine Verschlechterung der Wiederholbarkeit der Nutkontur mit sich bringt.In a preferred development, the device has exactly two rollers. Compared to devices known from the prior art, which sometimes had a larger number of rollers, this is a significant structural simplification, which at the same time does not result in any deterioration in the repeatability of the groove contour.

Vorzugsweise weist die zweite Rolle eine größere Breite als die erste Rolle auf.Preferably, the second roller has a greater width than the first roller.

Zu seiner weiteren bevorzugten Ausführungsform ist die erste Rolle in Richtung ihrer Rotationsachse mittig zu der zweiten Rolle ausgerichtet.In a further preferred embodiment, the first roller is aligned centrally with respect to the second roller in the direction of its axis of rotation.

In noch einer weiteren bevorzugten Ausführungsform weist die zweite Rolle, vorzugsweise in Richtung ihrer Rotationsachse mittig, eine umlaufende Ausnehmung auf, die derart dimensioniert ist, dass die erste Rolle das zwischen den Rollen befindliche Rohr in der zweiten Position in die Ausnehmung hineinpresst. Die Breite der Ausnehmung übersteigt vorzugsweise die Breite der ersten Rolle um mindestens das Doppelte der Materialstärke des Rohres.In yet another preferred embodiment, the second roller has, preferably centrally in the direction of its axis of rotation, a circumferential recess which is dimensioned such that the first roller can guide the pipe located between the rollers in the second position into the recess. The width of the recess preferably exceeds the width of the first roller by at least twice the material thickness of the pipe.

Die Breite der Ausnehmung der zweiten Rolle überschreitet besonders bevorzugtdie Breite der ersten Rolle derart, dass die erste Rolle und die zweite Rolle in der zweiten Position einen Spalt mit der Kontur der umlaufenden Nut definieren.The width of the recess of the second roller particularly preferably exceeds the width of the first roller such that the first roller and the second roller in the second position define a gap with the contour of the circumferential groove.

Weiter vorzugsweise sind diejenigen umlaufenden Kanten der ersten Rolle und/oder der zweiten Rolle, die in der zweiten Position mit dem Rohr in Kontakt stehen, abgerundet. Dies reduziert Spannungsspitzen im Material des Rohres, was die Dauerfestigkeit und Korrosionsbeständigkeit des Rohres positiv beinflusst, und auch den Verschleiß der ersten und zweiten Rollen reduziert.Further preferably, those peripheral edges of the first roller and/or the second roller that are in contact with the pipe in the second position are rounded. This reduces stress peaks in the material of the pipe, which has a positive effect on the fatigue strength and corrosion resistance of the pipe, and also reduces wear on the first and second rollers.

Die jeweils andere Rolle ist relativ zur Rotationsache des Metallrohres fix angeordnet.The other roller is fixed relative to the axis of rotation of the metal tube.

Die Erfindung ist vorstehend gemäß eines ersten Aspekts mit Bezug auf die erfindungsgemäße Vorrichtung beschrieben worden. Gemäß einem zweiten Aspekt löst die Erfindung die eingangs formulierte Aufgabe bei einem Verfahren der eingangs bezeichneten Art mit den folgenden Schritten:
Bereitstellen einer ersten, rotatorisch angetriebenen Rolle, und einer zweiten, freidrehenden Rolle in einer ersten Position, wobei die Rollen in der ersten Position einen ersten Abstand zueinander einnehmen, der ein Einführen einer Wandung des Rohres zwischen die Rollen erlaubt, Einführen der Wandung zwischen die erste Rolle und die zweite Rolle, Erzeugen einer Relativbewegung zwischen der ersten und zweien Rolle von der ersten in eine zweite Position, in der die Rollen einen geringeren, zweiten Abstand zueinander einnehmen, der geringer als eine Materialstärke der Wandung des Rohres ist, wobei das Erfassen und Drehen des Rohres mittels der ersten angetriebenen Rolle in der zweiten Position von außerhalb erfolgt, wobei die erste Rolle relativ zu der zweiten Rolle eine aufgeraute oder strukturierte Oberfläche aufweist, sodass in das Rohr in der zweiten Position eine umlaufende Nut eingepresst wird , wobei die Relativbewegung zwischen der ersten und zweiten Rolle durch Bewegung der ersten Rolle quer zu ihrer Rotationsachse erzeugt wird. Hinsichtlich der Vorteile, die sich die Erfindung gemäß dem zweiten Aspekt zu Eigen macht, wird auf die vorstehenden Ausführungen zur erfindungsgemäßen Vorrichtung verwiesen.The invention has been described above according to a first aspect with reference to the device according to the invention. According to a second aspect, the invention achieves the object formulated at the outset in a method of the type described at the outset with the following steps:
Providing a first, rotationally driven roller and a second, freely rotating roller in a first position, wherein the rollers in the first position assume a first distance from one another which allows a wall of the pipe to be inserted between the rollers, inserting the wall between the first roller and the second roller, generating a relative movement between the first and second rollers from the first to a second position in which the rollers assume a smaller, second distance from one another which is less than a material thickness of the wall of the pipe, wherein the gripping and rotation of the pipe by means of the first driven roller in the second position takes place from outside, wherein the first roller has a roughened or structured surface relative to the second roller, so that a circumferential groove is pressed into the pipe in the second position, wherein the relative movement between the first and second rollers is generated by moving the first roller transversely to its axis of rotation. With regard to the advantages that the invention makes its own according to the second aspect, reference is made to the above statements on the device according to the invention.

Das erfindungsgemäße Verfahren macht sich ferner die gleichen Vorteile und bevorzugten Ausführungsformen zu Eigen wie die vorstehend beschriebene erfindungsgemäße Vorrichtung.The method according to the invention furthermore has the same advantages and preferred embodiments as the device according to the invention described above.

Insbesondere wird das Verfahren durch folgenden Schritt weitergebildet: Hineinpressen des zwischen den Rollen befindlichen Rohres in der zweiten Position in eine, vorzugsweise in Richtung ihrer Rotationsachse mittig, auf der zweiten Rolle umlaufende Ausnehmung mittels der ersten Rolle, vorzugsweise in einen zwischen der der ersten Rolle und der zweiten Rolle in der zweiten Position definierten Spalt mit der Kontur der umlaufenden Nut hinein.In particular, the method is further developed by the following step: pressing the pipe located between the rollers in the second position into a recess which runs around the second roller, preferably centrally in the direction of its axis of rotation, by means of the first roller, preferably into a gap with the contour of the circumferential groove defined between the first roller and the second roller in the second position.

Das Verfahren gemäß dem zweiten Aspekt der Erfindung kann Teil eines nicht zur Erfindung zählenden Verfahrens zum Innenbeschichten eines Rohres sein und die folgenden Schritte umfassen:
Reinigen des Rohres, insbesondere mittels eines, mehrerer oder sämtlicher der folgenden Maßnahmen: Entfetten, Spülen, insbesondere mit entionisiertem Wasser, Beizen;The method according to the second aspect of the invention may be part of a method not forming part of the invention for coating the inside of a pipe and may comprise the following steps:
Cleaning the pipe, in particular by means of one, several or all of the following measures: degreasing, rinsing, in particular with deionised water, pickling;

Beschichten der Innenseite des Rohres, insbesondere mittels Aufbringen einer Beschichtung auf chemischer Basis, insbesondere einer Autodepositionsbeschichtung. Vorzugsweise ist das Beschichtungsmaterial wasserbasiertes Autodepositionsmaterial, wobei besonders bevorzugt Polyvinylidenchlorid (PVDC) oder Epoxy-Acryl-Urethan als Harz verwendet wird. Der Beschichtungsvorgang erfolgt vorzugsweise mittels Zuführung einer Dispersion enthaltend eine Säure, beispielsweise FeF3-Eisenfluorid, und Lackpartikel, wobei die Säure, bspw. das FeF3-Eisenfluorid, eine Freisetzung von Fe2+-Ionen an der innenseitigen Oberfläche des Metallrohres herbeiführt, welche sich mit den Lackpartikeln verbinden und sodann wieder an die innenseitige Oberfläche der Metallrohre anlagern. Als vorstehend beschriebenes Beschichtungsmaterial kommt beispielsweise das von der Firma Henkel in Düsseldorf, Deutschland entwickelte BONDERITE ™ M-PP Material (ehem. Aquence™) infrage.Coating the inside of the pipe, in particular by applying a chemical-based coating, in particular an autodeposition coating. The coating material is preferably a water-based autodeposition material, with polyvinylidene chloride (PVDC) or epoxy-acrylic-urethane being particularly preferably used as the resin. The coating process is preferably carried out by adding a dispersion containing an acid, for example FeF 3 iron fluoride, and paint particles, with the acid, for example the FeF 3 iron fluoride, causing Fe 2+ ions to be released on the inside surface of the metal pipe, which combine with the paint particles and then re-attach to the inside surface of the metal pipe. The coating material described above is, for example, the BONDERITE ™ M-PP material (formerly Aquence ™ ) developed by Henkel in Düsseldorf, Germany.

Die Erfindung wird im Folgenden unter Bezugnahme auf die beigefügten Figuren anhand eines bevorzugten Ausführungsbeispiels näher beschrieben. Hierbei zeigen:

Fig. 1
eine schematische Seitenansicht einer Vorrichtung zum Erzeugen einer umlaufenden Nut gemäß einem bevorzugten Ausführungsbeispiel, und
Fig. 2
eine schematische weitere Seitenansicht der Vorrichtung gemäß Fig. 1.
The invention is described in more detail below with reference to a preferred embodiment and the accompanying figures.
Fig.1
a schematic side view of a device for producing a circumferential groove according to a preferred embodiment, and
Fig.2
a schematic further side view of the device according to Fig.1 .

In Figur 1 ist eine Vorrichtung 1 zum Erzeugen einer umlaufenden Nut 101 (Fig. 2) in einem Metallrohr 100 abgebildet. Die Vorrichtung weist eine erste Rolle 3 und eine zweite Rolle 5 auf, wobei die erste Rolle 3 rotarisch angetrieben ist, während die zweite Rolle 5 vorzugsweise freidrehend gelagert ist. Die erste, angetriebene Rolle 3 ist mittels einer ersten Lagerung 17 gelagert, während die zweite Rolle 5 mittels einer zweiten Lagerung 11 gelagert ist. Die erste Rolle 3 ist im gezeigten Ausführungsbeispiel mittels eines Triebmittels 9, beispielsweise einer Antriebskette oder eines Antriebsgurtes oder Zahnriemens mit einer Antriebseinheit 7 verbunden. In einer alternativen, nicht dargestellten Ausführungsform ist die erste Rolle 3 vorzugsweise elektromotorisch angetrieben, wobei der Elektromotor dann direkt an dem auch die Lagerung 17 tragenden Gehäuse mit der Vorrichtung 1 angeordnet sein kann.In Figure 1 is a device 1 for producing a circumferential groove 101 ( Fig.2 ) in a metal tube 100. The device has a first roller 3 and a second roller 5, the first roller 3 being driven in rotation, while the second roller 5 is preferably mounted so as to rotate freely. The first, driven roller 3 is mounted by means of a first bearing 17, while the second roller 5 is mounted by means of a second bearing 11. In the exemplary embodiment shown, the first roller 3 is connected to a drive unit 7 by means of a drive means 9, for example a drive chain or a drive belt or toothed belt. In an alternative embodiment not shown, the first roller 3 is preferably driven by an electric motor, wherein the electric motor can then be arranged directly on the housing with the device 1, which also carries the bearing 17.

Die freidrehende Rolle 5 ist an einer Tragstruktur 13 angeordnet, während die erste, angetriebene Rolle 3 an einer Andrückeinrichtung 15 angeordnet ist.The freely rotating roller 5 is arranged on a support structure 13, while the first, driven roller 3 is arranged on a pressing device 15.

Wie sich insbesondere aus Fig. 2 anschaulich ergibt, ist die Andrückeinrichtung 15 relativ zu der Tragstruktur 13 bewegbar. Durch diese Relativbewegung wird die erste, angetriebene Rolle 3 relativ zu der zweiten, freidrehenden Rolle 5 quer zu einer Rotationsachse R des Metallrohres 100 bewegt. Die erste Rolle 3 ist um eine Rotationsachse A rotatorisch angetrieben bewegbar.As is particularly evident from Fig.2 As can be clearly seen, the pressing device 15 is movable relative to the support structure 13. This relative movement causes the first, driven roller 3 to be moved relative to the second, freely rotating roller 5 transversely to a rotation axis R of the metal tube 100. The first roller 3 is rotationally driven and movable about a rotation axis A.

Die zweite Rolle 5 übersteigt in der Breite in Richtung der Rotationsachse A, bzw. der Rotationsachse R des Metallrohres 100 bzw. in Richtung der Rotationsachse F der freidrehenden Rolle 5, die Breite der ersten Rolle 3. Ferner weist die zweite Rolle 5 eine Ausnehmung 19 an ihrer Umfangsfläche auf, die die Breite der ersten Rolle 3 soweit übersteigt, dass zwischen der ersten und der zweiten Rolle 3, 5 ein Spalt 21 ausgebildet ist, wenn sich die erste Rolle 3 von einer ersten Position in die, in den Figuren gezeigte, zweite Position bewegt hat.The width of the second roller 5 exceeds the width of the first roller 3 in the direction of the rotation axis A, or the rotation axis R of the metal tube 100, or in the direction of the rotation axis F of the freely rotating roller 5. Furthermore, the second roller 5 has a recess 19 on its peripheral surface, which exceeds the width of the first roller 3 to such an extent that a gap 21 is formed between the first and the second roller 3, 5 when the first roller 3 has moved from a first position to the second position shown in the figures.

Die erste und zweite Rolle 3, 5 sind in der (nicht dargestellten) ersten Position so weit voneinander entfernt, dass das Metallrohr 100 mit seiner Materialstärke M zwischen den Rollen 3, 5 hindurchgeführt werden kann, um mit einem Endabschnitt 103 zwischen den Rollen 3, 5 angeordnet zu werden. Ist das Rohr 100 mit seinem Endabschnitt 103 entsprechend angeordnet, wird die erste Rolle 3 rotatorisch bewegt und mittels der Andrückeinrichtung 15 gegen die zweite Rolle 5 gedrückt, sodass das Material des Metallrohres 100 in den Spalt 21 zwischen den Rollen 3, 5 hineingepresst wird, wodurch außen eine Nut 101 im Endabschnitt 103 des Metallrohres erzeugt wird.The first and second rollers 3, 5 are far enough apart in the first position (not shown) that the metal tube 100 with its material thickness M can be guided through between the rollers 3, 5 in order to be arranged with an end section 103 between the rollers 3, 5. If the tube 100 with its end section 103 is arranged accordingly, the first roller 3 is rotated and pressed against the second roller 5 by means of the pressing device 15, so that the material of the metal tube 100 is pressed into the gap 21 between the rollers 3, 5, whereby a groove 101 is created on the outside in the end section 103 of the metal tube.

Die zum Drehen des Rohres 100 notwendige Strukturierung der Oberfläche 6 der ersten Rolle 3 wird somit ausschließlich auf die äußere Umfangsfläche des Rohres 100 aufgepresst, sodass die Innenfläche des Rohres 100 insbesondere im Endabschnitt 103 mit Ausnahme der Vorwölbung der Nut 101 in das Innere hinein vollständig glatt bleiben kann. Das nachfolgende Aufbringen einer Korrosionsschutzschicht oder sonstigen Beschichtung ist uneingeschränkt möglich.The structuring of the surface 6 of the first roller 3 required for rotating the pipe 100 is thus pressed exclusively onto the outer circumferential surface of the pipe 100, so that the inner surface of the pipe 100 can remain completely smooth, particularly in the end section 103, with the exception of the protrusion of the groove 101 into the interior. The subsequent application of a corrosion protection layer or other coating is possible without restriction.

Claims (9)

  1. An apparatus (1) for producing a peripheral groove (101) in an end portion (103) of a metal tube (100), in particular a metal tube (100) which is to be coated on the inside, the groove (101) being set up for receiving tube connectors, having
    - a first, rotationally driven roller (3),
    - a second, freely rotating roller (5),
    the first roller (3) having a roughened or structured surface (6) relative to the second roller (5),
    - a pressing device (15) for producing a relative movement between the first and second roller (3, 5), between a first and a second position, the rollers (3, 5) assuming a first spacing from one another in the first position, which first spacing permits an introduction of a wall of the tube between the rollers (3, 5), and assuming a smaller, second spacing from one another in the second position, which second spacing is smaller than a material thickness (M) of the wall of the tube,
    characterized in that in the second position, the first, driven roller (3) is placed against the outer circumferential surface of the tube and adapted to grip the tube from the outside and to rotate it, with the result that a peripheral groove (101) is pressed into the tube in the second position when the first roller (3) is driven,
    the pressing device (15) being set up to move the first, driven roller (3) transversely with respect to its rotational axis (A).
  2. The apparatus (1) as claimed in claim 1,
    the apparatus having exactly two rollers (3, 5).
  3. The apparatus (1) as claimed in claim 1 or 2,
    the second roller (5) having a greater width than the first roller (3).
  4. The apparatus (1) as claimed in one of the preceding claims,
    the first roller (3) being oriented centrally in the direction of its rotational axis (A) with respect to the second roller (5).
  5. The apparatus (1) as claimed in one of the preceding claims,
    the second roller (5) having, preferably centrally in the direction of its rotational axis (F), a peripheral recess (19) which is dimensioned in such a way that the first roller (3) presses the tube which is situated between the rollers (3, 5) into the recess (19) in the second position.
  6. The apparatus (1) as claimed in one of the preceding claims,
    the width of the recess (19) of the second roller (5) exceeding the width of the first roller (3) in such a way that the first roller (3) and the second roller (5) define a gap (21) with the contour of the peripheral groove (101) in the second position.
  7. The apparatus (1) as claimed in one of the preceding claims,
    those peripheral edges of the first roller (3) and/or the second roller (5) which are in contact with the tube in the second position being rounded.
  8. A method for producing a peripheral groove (101) in an end portion (103) of a metal tube (100), in particular of a metal tube (100) which is to be coated on the inside, the groove (101) being set up for receiving tube connectors, comprising the steps:
    - providing of a first, rotationally driven roller (3), the first roller (3) having a roughened or structured surface (6) relative to the second roller (5), and a second, freely rotating roller (5) in a first position, the rollers (3, 5) assuming a first spacing from one another in the first position, which first spacing permits an introduction of a wall of the tube between the rollers (3, 5),
    - introducing of the wall between the first roller (3) and the second roller (5),
    - producing of a relative movement between the first and second roller (5) from the first into a second position, in which the rollers (3, 5) assume a smaller, second spacing from one another which is smaller than a material thickness (M) of the wall of the tube, characterized by:
    - gripping and rotating of the tube by means of the first driven roller (3) in the second position from the outside, with the result that a peripheral groove (101) is pressed into the tube in the second position, the relative movement between the first and second roller (5) being produced by way of movement of the first roller (3) transversely with respect to its rotational axis (A).
  9. The method as claimed in claim 8,
    comprising the step:
    pressing of the tube which is situated between the rollers (3, 5) in the second position into a recess (19) which runs around on the second roller (5), preferably in the direction of its rotational axis (A), by means of the first roller (3), preferably into a gap (21) with the contour of the peripheral groove (101), which gap (21) is defined between the first roller (3) and the second roller (5) in the second position.
EP17816788.8A 2016-12-15 2017-12-14 Apparatus and method for producing a peripheral groove in an end portion of a metal tube Active EP3554731B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016124487.2A DE102016124487A1 (en) 2016-12-15 2016-12-15 Apparatus and method for producing a circumferential groove in an end portion of a metal pipe
PCT/EP2017/082772 WO2018109067A1 (en) 2016-12-15 2017-12-14 Apparatus and method for producing a peripheral groove in an end portion of a metal tube

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EP3554731B1 true EP3554731B1 (en) 2024-07-31

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EP (1) EP3554731B1 (en)
CN (1) CN110087789B (en)
DE (1) DE102016124487A1 (en)
WO (1) WO2018109067A1 (en)

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CN113210512B (en) * 2021-05-25 2022-11-01 云南云霖金属制品有限责任公司 Production method of full-automatic flaring production device for steel pipe

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US11975374B2 (en) 2024-05-07
DE102016124487A1 (en) 2018-06-21
US20200094304A1 (en) 2020-03-26
US20210339304A1 (en) 2021-11-04
CN110087789A (en) 2019-08-02
WO2018109067A1 (en) 2018-06-21
CN110087789B (en) 2021-07-23
EP3554731A1 (en) 2019-10-23

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