EP2138248B1 - Procédé de pliage pour tuyaux coniques - Google Patents

Procédé de pliage pour tuyaux coniques Download PDF

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Publication number
EP2138248B1
EP2138248B1 EP08011525A EP08011525A EP2138248B1 EP 2138248 B1 EP2138248 B1 EP 2138248B1 EP 08011525 A EP08011525 A EP 08011525A EP 08011525 A EP08011525 A EP 08011525A EP 2138248 B1 EP2138248 B1 EP 2138248B1
Authority
EP
European Patent Office
Prior art keywords
bending
sleeve
tube
pipe
sections
Prior art date
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.)
Not-in-force
Application number
EP08011525A
Other languages
German (de)
English (en)
Other versions
EP2138248A1 (fr
Inventor
Ernst Wohlgemuth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ewo GmbH
Original Assignee
Ewo GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ewo GmbH filed Critical Ewo GmbH
Priority to EP08011525A priority Critical patent/EP2138248B1/fr
Priority to DE502008001532T priority patent/DE502008001532D1/de
Priority to AT08011525T priority patent/ATE484347T1/de
Publication of EP2138248A1 publication Critical patent/EP2138248A1/fr
Application granted granted Critical
Publication of EP2138248B1 publication Critical patent/EP2138248B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 lengths 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 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 the additional movement of the second counter roll 10 perpendicular to the plane of the drawing, resulting in a three-dimensional bending of the pipe 1.

Claims (9)

  1. Procédé de pliage pour le pliage d'un tuyau conique (1) caractérisé en ce qu'une douille pliable (3) avec un diamètre extérieur constant (4) et avec un diamètre intérieur correspondant à la conicité du tuyau est glissée sur le tuyau (1) avant le pliage, et le tuyau (1) est soumis à un processus de pliage avec la douille (3) glissée.
  2. Procédé de pliage selon revendication 1, caractérisé en ce que la douille (3) est composée de plusieurs sections de gaine (5).
  3. Procédé de pliage selon revendication 2, caractérisé en ce que les sections de douille (5) sont glissées individuellement sur le tuyau (1).
  4. Procédé de pliage selon l'une des revendications 2 ou 3, caractérisé en ce que les sections de douille (5) voisines respectives sont reliées les unes aux autres avant le processus de pliage.
  5. Procédé de pliage selon la revendication 4, caractérisé en ce que les sections de douille (5) voisines respectives sont reliées les unes aux autres par un assemblage à emboîtement (6, 7).
  6. Procédé de pliage selon l'une des revendications précédentes, caractérisé en ce que le tuyau (1) est soumis à une torsion avec la douille (3) pendant le processus de pliage autour de son axe longitudinal.
  7. Procédé de pliage selon revendication 6, caractérisé en ce que la torsion est exécutée de manière synchrone avec le pliage, dans le but d'obtenir un pliage par torsion du tuyau (1).
  8. Procédé de pliage selon l'une des revendications précédentes caractérisé en ce qu'une douille (3) en plastique, plus particulièrement en nylon est utilisée.
  9. Procédé de pliage selon l'une des revendications précédentes caractérisé en ce que le tuyau (1) est plié dans une machine de pliage à trois rouleaux.
EP08011525A 2008-06-25 2008-06-25 Procédé de pliage pour tuyaux coniques Not-in-force EP2138248B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08011525A EP2138248B1 (fr) 2008-06-25 2008-06-25 Procédé de pliage pour tuyaux coniques
DE502008001532T DE502008001532D1 (de) 2008-06-25 2008-06-25 Biegeverfahren für konische Rohre
AT08011525T ATE484347T1 (de) 2008-06-25 2008-06-25 Biegeverfahren für konische rohre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08011525A EP2138248B1 (fr) 2008-06-25 2008-06-25 Procédé de pliage pour tuyaux coniques

Publications (2)

Publication Number Publication Date
EP2138248A1 EP2138248A1 (fr) 2009-12-30
EP2138248B1 true EP2138248B1 (fr) 2010-10-13

Family

ID=40558843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08011525A Not-in-force EP2138248B1 (fr) 2008-06-25 2008-06-25 Procédé de pliage pour tuyaux coniques

Country Status (3)

Country Link
EP (1) EP2138248B1 (fr)
AT (1) ATE484347T1 (fr)
DE (1) DE502008001532D1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1263459B (de) 1961-04-28 1968-03-14 Stahlform Berlin Ges Mit Besch Vorrichtung zum Biegen von Rohren, insbesondere von konischen Beleuchtungs-Peitschenmasten
JPS5927661B2 (ja) * 1979-04-11 1984-07-07 三恵技研工業株式会社 テ−パ−管の曲げ加工方法
JP3507369B2 (ja) * 1999-08-10 2004-03-15 株式会社太洋 テーパー管の曲げ加工装置
DE19956796A1 (de) 1999-11-25 2001-06-13 Palima W Ludwig & Co Biegevorrichtung für das 2- und 3-dimensionale Profilbiegen
DE10119030A1 (de) 2000-04-18 2002-01-03 Palima W Ludwig & Co Biegevorrichtung zum 2D- und/oder 3D-Profil- und Rohrbiegen
DE10326107A1 (de) * 2003-06-06 2005-01-05 Thyssenkrupp Stahl Ag Biegevorrichtung für dünnwandige Rohre aus Metall, insbesondere Stahl

Also Published As

Publication number Publication date
DE502008001532D1 (de) 2010-11-25
EP2138248A1 (fr) 2009-12-30
ATE484347T1 (de) 2010-10-15

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