EP2138248A1 - Bending method for cone-shaped pipes - Google Patents

Bending method for cone-shaped pipes Download PDF

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Publication number
EP2138248A1
EP2138248A1 EP08011525A EP08011525A EP2138248A1 EP 2138248 A1 EP2138248 A1 EP 2138248A1 EP 08011525 A EP08011525 A EP 08011525A EP 08011525 A EP08011525 A EP 08011525A EP 2138248 A1 EP2138248 A1 EP 2138248A1
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EP
European Patent Office
Prior art keywords
bending
sleeve
tube
sections
bending method
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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EP08011525A
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German (de)
French (fr)
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EP2138248B1 (en
Inventor
Ernst Wohlgemuth
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Ewo GmbH
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Ewo GmbH
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Priority to DE502008001532T priority Critical patent/DE502008001532D1/en
Priority to EP08011525A priority patent/EP2138248B1/en
Priority to AT08011525T priority patent/ATE484347T1/en
Publication of EP2138248A1 publication Critical patent/EP2138248A1/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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length

Definitions

  • the present invention relates to a bending method for conical tubes.
  • Such a bending process is for example from the DE 1 263 459 is known and used for bending conical lighting whip pylons.
  • the method is a tension bending method which requires a guide rail and a rail.
  • the guide rail serves to guide the mast
  • the mold rail provides the shape that the mast is to accept by bending.
  • the mast is fixed at the beginning of the forming rail on the inside and passed between the two rails by a pair of rollers, which press the rails against each other.
  • the mast is pulled by the train along the forming rail, the pressure of the rollers and provided by the guide rail back pressure in the intended form.
  • both rails Due to the conicity of the masts, it is necessary that both rails have a corresponding conical trough, the shape of the taper of the Mast is equivalent, so that the bend can always be performed with a constant pressure. Therefore, the guide rail and the forming rail continuously balance the conicity of the mast, and a constant circumference is provided so that no consideration has to be given to the conicity of the mast during bending.
  • the disadvantage of this method is that only two-dimensional shapes can be bent.
  • the rails reach very large dimensions especially when bending large pipes and are therefore difficult to handle and expensive to store.
  • a separate rail is required for each pipe and each shape.
  • the object of the present invention is to provide a method with which conical tubes can be bent flexibly and which is easy to carry out.
  • this object is achieved in that a bendable sleeve with a constant outer diameter and an inner diameter corresponding to the conicity of the tube is pushed onto the tube before bending, and that the tube is subjected to a bending operation together with the pushed sleeve.
  • the basic idea of the bending process is thus to produce an arrangement which corresponds to a tube with a constant outside diameter by the use of a sleeve. This allows the pipe to be subjected to a bending operation with a conventional bending machine. It is particularly possible to achieve a three-dimensional deformation of the conical tube and to perform the bending in a simple manner. Also, the constant outer diameter facilitates handling, since all directions are equal to the longitudinal axis of the tube.
  • the sleeve can be composed of several sleeve sections. This makes it possible that the sleeve is easy to handle, even for very large conical tubes.
  • the individual sections can be used as needed, so that not different tubes for different length tubes must be kept, but only sleeve sections can be added for longer pipes or omitted for shorter pipes.
  • only one set of sleeve sections is required, from which, depending on the diameter and length of the tube, the required sections can be selected.
  • the length of each section is for the bending process irrelevant and can be chosen depending on practical considerations.
  • each section can be increased by short sleeve sections, whereby the individual sections can be moved, for example, without any special effort by a fitter. For longer sections, however, a smaller number of them is needed, which speeds up the provision of the sleeve.
  • the sleeve sections are pushed individually onto the tube. This has the consequence that no additional space for a previous mounting of the sleeve is needed and the sliding of the sleeve sections is easy to carry out. Due to the increasing friction with the larger weight, the forces required for pushing in individual sleeve sections can be kept low.
  • each adjacent sleeve sections can be connected to each other before the bending process.
  • a stop is attached to the end of the smaller outside diameter, which prevents slipping of the sleeve sections.
  • This reliability can be further increased by connecting each adjacent sleeve sections via a plug connection.
  • the tube can be rotated with the sleeve during the bending process about its longitudinal axis.
  • particularly complex bending molds can be realized in a simple manner.
  • with a bending machine for merely two-dimensional bending by the additional rotation of the tube three-dimensionally bent tubes can be produced.
  • the tube may be e.g. clamped at one end and rotated by a hydraulic transmission.
  • a sleeve made of plastic, in particular made of nylon is used.
  • the use of such a sleeve allows due to their material properties a uniform pressure transmission and reliable bending of the tubes.
  • the tube can be bent in a three roll bender. These machines are particularly suitable for bending large tubes with low bending radii, so that the conical tube can be bent easily here.
  • FIG. 1 shows a tube 1 with a conical outer diameter 2, which is according to the invention surrounded by a flexible sleeve 3 with a constant outer diameter 4.
  • the conical outer diameter 2 of the tube 1 corresponds to an inner diameter of the sleeve 3, so that tube 1 and sleeve 3 are in close contact over the entire length in the entire circumferential direction of the tube 1.
  • the sleeve 3 is composed of individual sleeve sections 5, which are individually pushed onto the tube 1.
  • the sleeve sections 5 have in their outer region in each case on the end face with the larger inner diameter of the opening an annular recess 6 and on the opposite end face on an annular projection 7.
  • the recesses 6 and annular projections 7 of adjacent sleeve sections 5 correspond to one another, so that the recess 6 of a sleeve section 5 and the projection 7 of the respectively adjacent sleeve section 5 engage each other when the sleeve sections 5 are pushed onto the tube 1.
  • the sleeve sections 5 come into contact with each other at their front sides without play, so that a continuous transition between the sleeve sections 5 results.
  • the sleeve sections 5 are secured to the tube 1 by a stop, not shown.
  • the stop is provided at the end of the tube 1 of smaller outer diameter, so that the free end face of the first sleeve portion 5 can come into abutment there.
  • the stop is not absolutely necessary, but nevertheless provided in order to obtain an exact positioning of the first sleeve section 5.
  • the tube 1 which is opposite to the direction of the arrow A, slidably clamped in the direction of arrow A. In this clamping, the tube 1 via a hydraulic transmission be rotated about its longitudinal axis in the direction of arrow B.
  • FIG. 2 schematically shows how the tube 1 is subjected together with the pushed sleeve 3 a bending process.
  • the tube 1 is fed in the direction of arrow A of a 3-roll bending machine, which is represented by a drive roller 8 and a first and second counter-roller 9, 10.
  • the rollers 8, 9, 10 are formed like a roller and are in tangential contact with the tube 1.
  • the drive roller 8 and the rear in the transport direction A first counter-roller 9 serve to guide the tube 1 with the sleeve 3 and at the same time provide for propulsion.
  • the opposite in the direction of arrow A second counter-roller 10 is offset from the longitudinal direction of the tube 1 and bends the tube 1 when passing through the rollers 8, 9, 10 in the desired shape.
  • the second counter-roller 10 is adjustably mounted in order to adjust a deflection of the roller 10 in the drawing plane perpendicular to the direction of the arrow A different bends. This allows a flexible two-dimensional bending of the tube 1 with the sleeve 3, which is not limited by the flexibility of the sleeve 3.
  • the rotation of the tube 1 additionally allows bending into a three-dimensional shape.
  • the tube 1 is first bent as described above and then rotated via the hydraulic transmission. If the tube 1 continues to bend afterwards bending, takes place in a new direction, so that the three-dimensional shape arises.
  • the rotation of the tube 1 is also possible synchronously with the bending.
  • the tube 1 is driven simultaneously in the transport direction A and in the direction of rotation B, so that a combined movement of the tube 1 results.
  • a torsional bending of the conical tube 1 is achieved by means of the same conventional bending machine.
  • the surfaces of the rollers 8, 9, 10 are concave.
  • the shape of the roller surface corresponds to the outer diameter 4 of the sleeve 3.
  • a line-shaped contact in FIG. 3 is visible as a free space, and the tube 1 with the sleeve 3 receives by the rollers 8, 9, 10 a lateral guide.
  • This allows additional movement of the second counter roll 10 perpendicular to the drawing plane, resulting in a three-dimensional bending of the pipe 1.

Abstract

The method involves moving a bendable sleeve (3) with a constant outer dimension (4) and an inner dimension corresponding to tapering of pipes (1), on the pipes before bending. The pipes together with the moved sleeve are subjected to a bending process. The sleeve is made of plastic i.e. nylon, from sleeve sections (5). The sleeve sections are individually moved on the pipes, and the sleeve sections are connected with each other by a plug connection before the bending process. The pipes with the sleeve are rotated at a longitudinal axis during the bending process.

Description

Die vorliegende Erfindung betrifft eine Biegeverfahren für konische Rohre.The present invention relates to a bending method for conical tubes.

Ein derartiges Biegeverfahren ist zum Beispiel aus der DE 1 263 459 bekannt und wird für das Biegen von konischen Beleuchtungspeitschenmasten verwendet. Bei dem Verfahren handelt es sich um ein Zugbiegeverfahren, für welches eine Führungsschiene und eine Formschiene erforderlich sind. Die Führungsschiene dient der Führung des Mastes, und die Formschiene stellt die Form bereit, die der Mast durch das Biegen annehmen soll. Zum Biegen wird der Mast wird am Anfang der Formschiene innenseitig fixiert und zwischen den beiden Schienen durch ein Paar Walzen geführt, welche die Schienen aneinanderpressen. Somit wird der Mast durch den Zug entlang der Formschiene, den Druck der Walzen und einen durch die Führungsschiene bereitgestellten Gegendruck in die beabsichtigte Form gezogen. Aufgrund der Konizität der Masten ist es erforderlich, dass beide Schienen eine korrespondierende konisch verlaufende Mulde aufweisen, deren Form der Konizität des Mastes entspricht, damit die Biegung immer mit einem konstanten Druck durchgeführt werden kann. Daher gleichen die Führungsschiene und die Formschiene die Konizität des Mastes kontinuierlich aus, und ein konstanter Umfang wird bereitgestellt, so dass beim Biegen keine Rücksicht auf die Konizität des Mastes genommen werden muss.Such a bending process is for example from the DE 1 263 459 is known and used for bending conical lighting whip pylons. The method is a tension bending method which requires a guide rail and a rail. The guide rail serves to guide the mast, and the mold rail provides the shape that the mast is to accept by bending. For bending, the mast is fixed at the beginning of the forming rail on the inside and passed between the two rails by a pair of rollers, which press the rails against each other. Thus, the mast is pulled by the train along the forming rail, the pressure of the rollers and provided by the guide rail back pressure in the intended form. Due to the conicity of the masts, it is necessary that both rails have a corresponding conical trough, the shape of the taper of the Mast is equivalent, so that the bend can always be performed with a constant pressure. Therefore, the guide rail and the forming rail continuously balance the conicity of the mast, and a constant circumference is provided so that no consideration has to be given to the conicity of the mast during bending.

Nachteilig ist an diesem Verfahren, dass nur zweidimensionale Formen gebogen werden können. Außerdem erreichen die Schienen insbesondere beim Biegen großer Rohre sehr große Abmessungen und sind daher schwer handzuhaben und aufwendig zu lagern. Zusätzlich ist für jedes Rohr und jede Form eine eigene Schiene erforderlich.The disadvantage of this method is that only two-dimensional shapes can be bent. In addition, the rails reach very large dimensions especially when bending large pipes and are therefore difficult to handle and expensive to store. In addition, a separate rail is required for each pipe and each shape.

Im Stand der Technik sind weiterhin aus der DE 199 57 796 A1 oder der DE 101 19 030 A1 Biegeverfahren bekannt, mit denen es möglich ist, Rohre mit konstantem Außendurchmesser in eine nahezu beliebige Form dreidimensional zu biegen. Auch ein Biegen zusammen mit einer Torsion ist für diese Rohre möglich. Rohre mit veränderlichem Außendurchmesser können mit diesen Verfahren jedoch nicht gebogen werden.In the prior art are still from the DE 199 57 796 A1 or the DE 101 19 030 A1 Bending known, with which it is possible to bend tubes with a constant outer diameter in a virtually arbitrary shape three-dimensional. Bending together with a twist is also possible for these tubes. However, variable outer diameter tubes can not be bent by these methods.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Verfügung zu stellen, mit dem konische Rohre flexibel gebogen werden können und das einfach durchzuführen ist.The object of the present invention is to provide a method with which conical tubes can be bent flexibly and which is easy to carry out.

Erfindungsgemäß ist diese Aufgabe dadurch gelöst, dass eine biegbare Hülse mit einem konstanten Außendurchmesser und einem mit der Konizität des Rohres korrespondierenden Innendurchmesser vor dem Biegen auf das Rohr geschoben wird, und dass das Rohr zusammen mit der aufgeschobenen Hülse einem Biegevorgang unterworfen wird.According to the invention, this object is achieved in that a bendable sleeve with a constant outer diameter and an inner diameter corresponding to the conicity of the tube is pushed onto the tube before bending, and that the tube is subjected to a bending operation together with the pushed sleeve.

Die Grundidee des Biegeverfahrens besteht also darin, durch die Verwendung einer Hülse eine Anordnung zu erzeugen, die einem Rohr mit konstantem Außendurchmesser entspricht. Dadurch kann das Rohr einem Biegevorgang mit einer herkömmlichen Biegemaschine unterworfen werden. Es ist insbesondere möglich, eine dreidimensionale Verformung des konischen Rohres zu erreichen und das Biegen auf einfache Weise durchzuführen. Auch erleichtert der konstante Außendurchmesser die Handhabung, da alle Richtungen quer zur Längsachse des Rohres gleichberechtigt sind.The basic idea of the bending process is thus to produce an arrangement which corresponds to a tube with a constant outside diameter by the use of a sleeve. This allows the pipe to be subjected to a bending operation with a conventional bending machine. It is particularly possible to achieve a three-dimensional deformation of the conical tube and to perform the bending in a simple manner. Also, the constant outer diameter facilitates handling, since all directions are equal to the longitudinal axis of the tube.

In weiterer Ausgestaltung der Erfindung kann die Hülse aus mehreren Hülsenabschnitten zusammengesetzt werden. Dadurch ist es möglich, dass die Hülse auch für besonders große konische Rohre leicht handzuhaben ist. Die einzelnen Abschnitte können je nach Bedarf verwendet werden, so dass nicht für unterschiedlich lange Rohre verschiedene Hülsen vorgehalten werden müssen, sondern lediglich Hülsenabschnitte bei längeren Rohren hinzugefügt oder bei kürzeren Rohren weggelassen werden können. Somit ist bei vorgegebener Konizität nur ein Satz Hülsenabschnitte erforderlich, aus dem je nach Durchmesser und Länge des Rohres die benötigten Abschnitte ausgewählt werden können. Die Länge der einzelnen Abschnitte ist für das Biegeverfahren unerheblich und kann abhängig von praktischen Überlegungen gewählt werden. So kann durch kurze Hülsenabschnitte die Handhabbarkeit eines jeden Abschnitts erhöht werden, wodurch die einzelnen Abschnitte zum Beispiel ohne besonderen Aufwand von einem Monteur bewegt werden können. Bei längeren Abschnitten wird hingegen eine geringere Anzahl davon benötigt, was das Bereitstellen der Hülse beschleunigt.In a further embodiment of the invention, the sleeve can be composed of several sleeve sections. This makes it possible that the sleeve is easy to handle, even for very large conical tubes. The individual sections can be used as needed, so that not different tubes for different length tubes must be kept, but only sleeve sections can be added for longer pipes or omitted for shorter pipes. Thus, with a given conicity, only one set of sleeve sections is required, from which, depending on the diameter and length of the tube, the required sections can be selected. The length of each section is for the bending process irrelevant and can be chosen depending on practical considerations. Thus, the handling of each section can be increased by short sleeve sections, whereby the individual sections can be moved, for example, without any special effort by a fitter. For longer sections, however, a smaller number of them is needed, which speeds up the provision of the sleeve.

Auf besonders vorteilhafte Weise werden die Hülsenabschnitte einzeln auf das Rohr aufgeschoben. Dies hat zur Folge, dass kein zusätzlicher Raum für eine vorhergehende Montage der Hülse benötigt wird und auch das Aufschieben der Hülsenabschnitte leicht durchführbar ist. Aufgrund der mit dem größeren Gewicht zunehmenden Reibung können die erforderlichen Kräfte für das Aufschieben bei einzelnen Hülsenabschnitten gering gehalten werden.In a particularly advantageous manner, the sleeve sections are pushed individually onto the tube. This has the consequence that no additional space for a previous mounting of the sleeve is needed and the sliding of the sleeve sections is easy to carry out. Due to the increasing friction with the larger weight, the forces required for pushing in individual sleeve sections can be kept low.

Zusätzlich können jeweils benachbarte Hülsenabschnitte vor dem Biegevorgang miteinander verbunden werden. Dazu ist es aufgrund der Konizität des Rohres ausreichend, wenn z.B. an dem Ende des kleineren Aussendurchmessers ein Anschlag befestigt wird, der ein Verrutschen der Hülsenabschnitte verhindert. So wird für den Biegevorgang sichergestellt, dass die Hülsenabschnitte eine stetige Form bilden und somit das Biegen zuverlässig durchgeführt werden kann. Diese Zuverlässigkeit kann weiter gesteigert werden, indem jeweils benachbarte Hülsenabschnitte über eine Steckverbindung miteinander verbunden werden.In addition, each adjacent sleeve sections can be connected to each other before the bending process. For this purpose, it is sufficient due to the taper of the tube, for example, if a stop is attached to the end of the smaller outside diameter, which prevents slipping of the sleeve sections. Thus, it is ensured for the bending process that the sleeve sections form a continuous shape and thus the bending can be performed reliably. This reliability can be further increased by connecting each adjacent sleeve sections via a plug connection.

Auch kann das Rohr mit der Hülse während des Biegevorgangs um seine Längsachse verdreht werden. Somit können besonders aufwendige Biegeformen auf einfache Weise realisiert werden. Auch können mit einer Biegemaschine für lediglich zweidimensionales Biegen durch das zusätzliche Drehen des Rohres dreidimensional gebogene Rohre hergestellt werden.Also, the tube can be rotated with the sleeve during the bending process about its longitudinal axis. Thus, particularly complex bending molds can be realized in a simple manner. Also, with a bending machine for merely two-dimensional bending by the additional rotation of the tube three-dimensionally bent tubes can be produced.

Darüber hinaus kann durch das Drehen synchron mit dem Biegen des Rohren eine Torsion des Rohres erreicht werden. Dies ermöglicht die Herstellung von komplexen Formen. Dazu kann das Rohr z.B. an einem Ende eingespannt und über ein Hydraulikgetriebe gedreht werden.Moreover, by rotating in synchronism with the bending of the tubes, torsion of the tube can be achieved. This allows the production of complex shapes. For this, the tube may be e.g. clamped at one end and rotated by a hydraulic transmission.

vorzugsweise wird bei dem Biegeverfahren eine Hülse aus Kunststoff, insbesondere aus Nylon verwendet. Die Verwendung einer derartigen Hülse ermöglicht aufgrund ihrer Materialeigenschaften eine gleichmäßige Druckübertragung und ein zuverlässiges Biegen der Rohre.Preferably, in the bending process, a sleeve made of plastic, in particular made of nylon is used. The use of such a sleeve allows due to their material properties a uniform pressure transmission and reliable bending of the tubes.

Schließlich kann das Rohr in einer Dreirollenbiegemaschine gebogen werden. Diese Maschinen sind für das Biegen von großen Rohren mit geringen Biegeradien besonders geeignet, so dass hier das konische Rohr auf einfache Weise gebogen werden kann.Finally, the tube can be bent in a three roll bender. These machines are particularly suitable for bending large tubes with low bending radii, so that the conical tube can be bent easily here.

Hinsichtlich weiterer vorteilhafter Ausgestaltung der Erfindung wird auf die Unteransprüche sowie nachfolgende Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die beiliegenden Zeichnungen verwiesen. In der Zeichnung zeigt:

Figur 1
ein konisches Rohr mit einer umgebenden Hülse in Schnittansicht,
Figur 2
eine schematische Darstellung des Biegevorgangs des Rohrs aus Figur 1 und
Figur 3
eine Schnittansicht durch eine Antriebsrolle und das Rohr mit der Hülse aus Figur 1.
With regard to further advantageous embodiment of the invention is based on the dependent claims and subsequent Description of an embodiment with reference to the accompanying drawings. In the drawing shows:
FIG. 1
a conical tube with a surrounding sleeve in sectional view,
FIG. 2
a schematic representation of the bending process of the tube FIG. 1 and
FIG. 3
a sectional view through a drive roller and the tube with the sleeve FIG. 1 ,

Die Figur 1 zeigt ein Rohr 1 mit einem konischen Außendurchmesser 2, das erfindungsgemäß von einer biegbaren Hülse 3 mit einem konstanten Außendurchmesser 4 umgeben ist. Der konische Außendurchmesser 2 des Rohrs 1 korrespondiert dabei mit einem Innendurchmesser der Hülse 3, so dass Rohr 1 und Hülse 3 über die gesamte Länge in der gesamten Umfangsrichtung des Rohrs 1 in engem Kontakt liegen.The FIG. 1 shows a tube 1 with a conical outer diameter 2, which is according to the invention surrounded by a flexible sleeve 3 with a constant outer diameter 4. The conical outer diameter 2 of the tube 1 corresponds to an inner diameter of the sleeve 3, so that tube 1 and sleeve 3 are in close contact over the entire length in the entire circumferential direction of the tube 1.

Die Hülse 3 ist aus einzelnen Hülsenabschnitten 5 zusammengesetzt, die jeweils einzeln auf das Rohr 1 geschoben sind. Die Hülsenabschnitte 5, die jeweils aus einem flexiblen Kunststoffmaterial wie Nylon bestehen, haben jeweils den gleichen konstanten Außendurchmesser 4 und weisen außerdem jeweils die gleiche Länge auf. Damit unterscheiden sie sich lediglich durch ihren Innendurchmesser, wodurch sie jeweils nur auf einen bestimmten Abschnitt des Rohres 1 aufgeschoben werden können.The sleeve 3 is composed of individual sleeve sections 5, which are individually pushed onto the tube 1. The sleeve portions 5, each made of a flexible plastic material such as nylon, each have the same constant outer diameter 4 and also each have the same length. Thus, they differ only by their inner diameter, whereby they can only be pushed onto a specific section of the tube 1.

Die Hülsenabschnitte 5 weisen in ihrem Außenbereich jeweils an der Stirnseite mit dem größeren Innendurchmesser der Öffnung eine ringförmige Aussparung 6 und an der gegenüberliegenden Stirnseite einen ringförmigen Vorsprung 7 auf. Die Aussparungen 6 und ringförmigen Vorsprünge 7 von benachbarten Hülsenabschnitten 5 korrespondieren miteinander, so dass die Aussparung 6 eines Hülsenabschnitts 5 und der Vorsprung 7 des jeweils benachbarten Hülsenabschnitts 5 miteinander in Eingriff kommen, wenn die Hülsenabschnitte 5 auf das Rohr 1 aufgeschoben werden. Dabei kommen die Hülsenabschnitte 5 an ihren Stirnseiten ohne Spiel miteinander in Anlage, so dass sich ein stetiger Übergang zwischen den Hülsenabschnitten 5 ergibt.The sleeve sections 5 have in their outer region in each case on the end face with the larger inner diameter of the opening an annular recess 6 and on the opposite end face on an annular projection 7. The recesses 6 and annular projections 7 of adjacent sleeve sections 5 correspond to one another, so that the recess 6 of a sleeve section 5 and the projection 7 of the respectively adjacent sleeve section 5 engage each other when the sleeve sections 5 are pushed onto the tube 1. The sleeve sections 5 come into contact with each other at their front sides without play, so that a continuous transition between the sleeve sections 5 results.

Die Hülsenabschnitte 5 sind auf dem Rohr 1 durch einen nicht gezeigten Anschlag gesichert. Der Anschlag ist an dem Ende des Rohres 1 des kleineren Außendurchmessers vorgesehen, so dass die freie Stirnseite des ersten Hülsenabschnittes 5 dort in Anlage kommen kann. Der Anschlag ist nicht unbedingt erforderlich, aber dennoch vorgesehen, um eine exakte Positionierung des ersten Hülsenabschnittes 5 zu erhalten.The sleeve sections 5 are secured to the tube 1 by a stop, not shown. The stop is provided at the end of the tube 1 of smaller outer diameter, so that the free end face of the first sleeve portion 5 can come into abutment there. The stop is not absolutely necessary, but nevertheless provided in order to obtain an exact positioning of the first sleeve section 5.

Außerdem ist das Rohr 1, das entgegen der Pfeilrichtung A liegt, in Pfeilrichtung A verschiebbar eingespannt. In dieser Einspannung kann das Rohr 1 über ein Hydraulikgetriebe um seine Längsachse in Pfeilrichtung B gedreht werden.In addition, the tube 1, which is opposite to the direction of the arrow A, slidably clamped in the direction of arrow A. In this clamping, the tube 1 via a hydraulic transmission be rotated about its longitudinal axis in the direction of arrow B.

Die Figur 2 zeigt schematisch, wie das Rohr 1 zusammen mit der aufgeschobenen Hülse 3 einem Biegeverfahren unterworfen wird. Das Rohr 1 wird dabei in Richtung des Pfeils A einer 3-Rollen-Biegemaschine zugeführt, die durch eine Antriebsrolle 8 und eine erste und zweite Gegenrolle 9, 10 dargestellt ist. Die Rollen 8, 9, 10 sind walzenartig ausgebildet und stehen in tangentialem Kontakt mit dem Rohr 1. Die Antriebsrolle 8 und die in Transportrichtung A hinten liegende erste Gegenrolle 9 dienen zur Führung des Rohres 1 mit der Hülse 3 und sorgen gleichzeitig für den Vortrieb. Die in Richtung des Pfeils A vorne liegende zweite Gegenrolle 10 ist gegenüber der Längsrichtung des Rohres 1 versetzt und biegt das Rohr 1 beim Durchgang durch die Rollen 8, 9, 10 in die gewünschte Form. Die zweite Gegenrolle 10 ist verstellbar gelagert, um über eine Verschiebung der Rolle 10 in der zeichnungsebene senkrecht zur Richtung des Pfeils A unterschiedliche Biegungen einstellen zu können. Dies ermöglicht eine flexible zweidimensionale Verbiegung des Rohres 1 mit der Hülse 3, die durch die Biegbarkeit der Hülse 3 nicht eingeschränkt wird.The FIG. 2 schematically shows how the tube 1 is subjected together with the pushed sleeve 3 a bending process. The tube 1 is fed in the direction of arrow A of a 3-roll bending machine, which is represented by a drive roller 8 and a first and second counter-roller 9, 10. The rollers 8, 9, 10 are formed like a roller and are in tangential contact with the tube 1. The drive roller 8 and the rear in the transport direction A first counter-roller 9 serve to guide the tube 1 with the sleeve 3 and at the same time provide for propulsion. The opposite in the direction of arrow A second counter-roller 10 is offset from the longitudinal direction of the tube 1 and bends the tube 1 when passing through the rollers 8, 9, 10 in the desired shape. The second counter-roller 10 is adjustably mounted in order to adjust a deflection of the roller 10 in the drawing plane perpendicular to the direction of the arrow A different bends. This allows a flexible two-dimensional bending of the tube 1 with the sleeve 3, which is not limited by the flexibility of the sleeve 3.

Das Drehen des Rohres 1 erlaubt zusätzlich das Biegen in eine dreidimensionale Form. Dazu wird das Rohr 1 zunächst wie oben beschrieben gebogen und dann über das Hydraulikgetriebe gedreht. Wenn das Rohr 1 im Anschluss weiter gebogen wird, findet das Biegen in einer neuen Richtung statt, so dass die dreidimensionale Form entsteht.The rotation of the tube 1 additionally allows bending into a three-dimensional shape. For this purpose, the tube 1 is first bent as described above and then rotated via the hydraulic transmission. If the tube 1 continues to bend afterwards bending, takes place in a new direction, so that the three-dimensional shape arises.

Prinzipiell ist das Drehen des Rohres 1 auch synchron mit dem Biegen möglich. Dazu wird das Rohr 1 gleichzeitig in Transportrichtung A und in Drehrichtung B angetrieben, sodass sich eine kombinierte Bewegung des Rohres 1 ergibt. Auf diese Weise wird eine Torsionsverbiegung des konischen Rohres 1 mit Hilfe der selben konventionellen Biegemaschine erreicht.In principle, the rotation of the tube 1 is also possible synchronously with the bending. For this purpose, the tube 1 is driven simultaneously in the transport direction A and in the direction of rotation B, so that a combined movement of the tube 1 results. In this way, a torsional bending of the conical tube 1 is achieved by means of the same conventional bending machine.

In einer modifizierten Biegevorrichtung sind die Oberflächen der Rollen 8, 9, 10 konkav ausgeführt. Wie in Figur 3 anhand der beispielhaft gezeigten Antriebsrolle 8 zu sehen ist, korrespondiert die Form der Rollenoberfläche mit dem Außendurchmesser 4 der Hülse 3. Dadurch besteht zwischen den Rollen 8, 9, 10 und der Aussenfläche der Hülse 3 ein linienförmiger Kontakt, der in Figur 3 als Freiraum sichtbar ist, und das Rohr 1 mit der Hülse 3 erhält durch die Rollen 8, 9, 10 eine seitliche Führung. Dies ermöglicht das zusätzliche Bewegen der zweiten Gegenrolle 10 senkrecht zur zeichnungsebene, was zu einem ein dreidimensionalen Verbiegen des Rohres 1 führt. Durch das Drehen des Rohres 1 und der Hülse 3 synchron mit dem Biegen können mit dieser Biegevorrichtung beliebige Formen gebogen werden.In a modified bending device, the surfaces of the rollers 8, 9, 10 are concave. As in FIG. 3 can be seen, the shape of the roller surface corresponds to the outer diameter 4 of the sleeve 3. As a result, between the rollers 8, 9, 10 and the outer surface of the sleeve 3, a line-shaped contact in FIG. 3 is visible as a free space, and the tube 1 with the sleeve 3 receives by the rollers 8, 9, 10 a lateral guide. This allows additional movement of the second counter roll 10 perpendicular to the drawing plane, resulting in a three-dimensional bending of the pipe 1. By rotating the tube 1 and the sleeve 3 synchronously with the bending, any shapes can be bent with this bending device.

Claims (9)

Biegeverfahren für das Biegen eines konischen Rohres (1), dadurch gekennzeichnet, dass eine biegbare Hülse (3) mit einem konstanten Außendurchmesser (4) und einem mit der Konizität des Rohres (1) korrespondierenden Innendurchmesser vor dem Biegen auf das Rohr (1) geschoben wird, und dass das Rohr (1) zusammen mit der aufgeschobenen Hülse (3) einem Biegevorgang unterworfen wird.Bending method for bending a conical tube (1), characterized in that a bendable sleeve (3) with a constant outer diameter (4) and with the conicity of the tube (1) corresponding inner diameter pushed before bending on the tube (1) is, and that the tube (1) is subjected to a bending operation together with the pushed sleeve (3). Biegeverfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass die Hülse (3) aus mehreren Hülsenabschnitten (5) zusammengesetzt wird.Bending method according to claim 1, characterized in that the sleeve (3) is composed of a plurality of sleeve sections (5). Biegeverfahren gemäß Anspruch 2, dadurch gekennzeichnet, dass die Hülsenabschnitte (5) einzeln auf das Rohr (1) geschoben werden.Bending method according to claim 2, characterized in that the sleeve sections (5) are pushed individually onto the tube (1). Biegeverfahren gemäß einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass jeweils benachbarte Hülsenabschnitte (5) vor dem Biegevorgang miteinander verbunden werden.Bending method according to one of claims 2 or 3, characterized in that each adjacent sleeve sections (5) are connected to each other before the bending operation. Biegeverfahren gemäß Anspruch 4, dadurch gekennzeichnet, dass jeweils benachbarte Hülsenabschnitte (5) über eine Steckverbindung (6, 7) miteinander verbunden werden.Bending method according to claim 4, characterized in that each adjacent sleeve sections (5) via a plug connection (6, 7) are interconnected. Biegeverfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Rohr (1)mit der Hülse (3) während des Biegevorgangs um seine Längsachse verdreht wird.Bending method according to one of the preceding claims, characterized in that the tube (1) with the sleeve (3) is rotated about its longitudinal axis during the bending process. Biegeverfahren gemäß Anspruch 6, dadurch gekennzeichnet, dass das Drehen synchron mit dem Biegen des Rohres (1) durchgeführt wird, um eine Torsionsverbiegung des Rohres (1) zu erreichen.Bending method according to claim 6, characterized in that the rotation is carried out in synchronism with the bending of the tube (1) in order to achieve a torsional bending of the tube (1). Biegeverfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Hülse (3) aus Kunststoff, insbesondere aus Nylon verwendet wird.Bending method according to one of the preceding claims, characterized in that a sleeve (3) made of plastic, in particular made of nylon is used. Biegeverfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Rohr (1) in einer 3-Rollen-Biegemaschine gebogen wird.Bending method according to one of the preceding claims, characterized in that the tube (1) is bent in a 3-roller bending machine.
EP08011525A 2008-06-25 2008-06-25 Bending method for cone-shaped pipes Not-in-force EP2138248B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE502008001532T DE502008001532D1 (en) 2008-06-25 2008-06-25 Bending process for conical tubes
EP08011525A EP2138248B1 (en) 2008-06-25 2008-06-25 Bending method for cone-shaped pipes
AT08011525T ATE484347T1 (en) 2008-06-25 2008-06-25 BENDING PROCESS FOR CONICAL TUBES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08011525A EP2138248B1 (en) 2008-06-25 2008-06-25 Bending method for cone-shaped pipes

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EP2138248A1 true EP2138248A1 (en) 2009-12-30
EP2138248B1 EP2138248B1 (en) 2010-10-13

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EP (1) EP2138248B1 (en)
AT (1) ATE484347T1 (en)
DE (1) DE502008001532D1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1263459B (en) 1961-04-28 1968-03-14 Stahlform Berlin Ges Mit Besch Device for bending pipes, in particular conical lighting whip masts
JPS55136520A (en) * 1979-04-11 1980-10-24 Sankei Giken Kogyo Kk Bending method for taper pipe
JP2001047141A (en) * 1999-08-10 2001-02-20 Taiyo:Kk Bending device of tapered tube
DE19956796A1 (en) 1999-11-25 2001-06-13 Palima W Ludwig & Co Bending device for 2- and 3-dimensional profile bending
DE10119030A1 (en) 2000-04-18 2002-01-03 Palima W Ludwig & Co Bending device for bending tubes in two and/or three dimensions has bending rollers in plane perpendicular to tube input axis
DE10326107A1 (en) * 2003-06-06 2005-01-05 Thyssenkrupp Stahl Ag Bending device for thin-walled pipes of metal, in particular steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1263459B (en) 1961-04-28 1968-03-14 Stahlform Berlin Ges Mit Besch Device for bending pipes, in particular conical lighting whip masts
JPS55136520A (en) * 1979-04-11 1980-10-24 Sankei Giken Kogyo Kk Bending method for taper pipe
JP2001047141A (en) * 1999-08-10 2001-02-20 Taiyo:Kk Bending device of tapered tube
DE19956796A1 (en) 1999-11-25 2001-06-13 Palima W Ludwig & Co Bending device for 2- and 3-dimensional profile bending
DE10119030A1 (en) 2000-04-18 2002-01-03 Palima W Ludwig & Co Bending device for bending tubes in two and/or three dimensions has bending rollers in plane perpendicular to tube input axis
DE10326107A1 (en) * 2003-06-06 2005-01-05 Thyssenkrupp Stahl Ag Bending device for thin-walled pipes of metal, in particular steel

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DE502008001532D1 (en) 2010-11-25
EP2138248B1 (en) 2010-10-13
ATE484347T1 (en) 2010-10-15

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