EP2017019B1 - Verfahren zur Herstellung von Metallrohren mit ovalem oder elliptischem Querschnitt - Google Patents

Verfahren zur Herstellung von Metallrohren mit ovalem oder elliptischem Querschnitt Download PDF

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Publication number
EP2017019B1
EP2017019B1 EP08103876A EP08103876A EP2017019B1 EP 2017019 B1 EP2017019 B1 EP 2017019B1 EP 08103876 A EP08103876 A EP 08103876A EP 08103876 A EP08103876 A EP 08103876A EP 2017019 B1 EP2017019 B1 EP 2017019B1
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EP
European Patent Office
Prior art keywords
tube
rollers
deformation
section
tubes
Prior art date
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Not-in-force
Application number
EP08103876A
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English (en)
French (fr)
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EP2017019A1 (de
Inventor
Maurizio Tromba
Andrea Tromba
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Tromba Maurizio SNC
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Tromba Maurizio SNC
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Publication of EP2017019A1 publication Critical patent/EP2017019A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/155—Making tubes with non circular section

Definitions

  • the present invention refers to the field relative to the production of tubes.
  • the invention refers to a method for the production of metal tubes with oval, elliptical or similar section.
  • the metal tubes with a structural function are tubes that usually have diameters that range approximately from 100m to 800mm with variable depth from 6mm to 30mm.
  • the dimensions, in any case, can vary according to the needs.
  • the tubes with elliptical or oval section (or anyway not with a circular section) adapt better to the dimension's need of the structure within which they will fit in, having indeed a greater dimension compared to the other one. For this reason they are easily used for different applications and are requested everyday more in the building field.
  • the lengths of the tubes with oval or elliptical transversal section, as the common tubes are variable according to the needs and follow the market request, driven by the recent slants of the modern architecture. In any case are increasingly requested tubes with sizeable lengths, even over 4 meters. This could indeed cause further problems in the realization of these particular tubes.
  • tubes with oval or elliptical or similar section are produced or fabricated mainly in two ways: or by roller levelling and subsequent welding of a plate, or through press of a tube with a circular section.
  • oval-shaped tubes where a round-shaped metal tube is rolled is known from, for example WO 2004/037455 A .
  • roller levelling implies to predispose a plane plate, which is deformed through the known process of roller levelling (or rather it is bent) and then welded in order to obtain a tube with an oval or elliptical o similar section.
  • This method presents a main inconvenient of having to make one or more runs of welding on the plate, with a further cost relative to the realization of the run or bead and a consequent elevated time of production.
  • the welding must undergo to structural controls, to see if there are points that are not well done. Indeed, the tube having to accomplish structural tasks and being prone to elevated stress, must be carefully dimensioned.
  • the welding generates on the tube a number of problems related to the shrinkage of the metal, and therefore to eventual deformation of the tube, and problems related to the thermal treatment that the metal stands to, as a result of the same welding, that entails a distribution of the tube's stress not always optimal in order to structurally use it as it has been produces.
  • the production or manufacture through press comprises a tube with circular section, which is inserted between two castings applied on the press and therefore deformed until the desired shape of the oval or elliptical or similar section is reached. It is clear how this procedure requires powerful, and therefore expensive, machineries.
  • the power required for the press to deform the tube is directly proportional to different factors, between which are found the thickness of the tube, the length of the tube, the diameter of the tube, the deviation of the oval or elliptical or similar profile from the initial circular profile of the tube.
  • the deformation that the tube undergoes during the process according to the present method of the prior art, is applied by the press on the entire length of the tube, which is produced in a single processing phase in the press.
  • the press having to deform the tube contextually on its entire length, requires to have a lot of power. All these turn to require presses that are structurally big and expensive both from the point of view of their maintenance and their operation.
  • the deformation of the transversal section of the tube (5) happens in different passes of the tube (5) between the two rollers (3,4), being said two rollers (3,4) moved toward each other between the first and last passage of the tube (5) through said two rollers (3,4).
  • the two rollers are movable toward or apart from each other in order to obtain gradually the degree of ovalization requested. Substantially in each pass the tube is deformed gradually into the requested shape of the elliptical or egg-shaped section.
  • the tube so produced does not need any welding, as in the case of the production through roller levelling, and thus it is exempted from the above disadvantages.
  • the passage of the tube during the processing between a couple of rollers or more couple of rollers leaves a trace that longitudinally extends along the tube, in particular in correspondence of the points of the elliptical section that are placed in the zone where the two opposed rollers of each couple interface.
  • the trace is given by the fact that the rollers, being reverse-rolling, act in the opposite direction on the material of the tube during the processing, and therefore leaving a trace that is easily identifiable.
  • the passage along the rollers helps the orientation of the fibres of the tube according to the direction of great pressure and thus improve the technical features of strength to combined bending and compressive stress.
  • a device for the production of tubes with oval or elliptical or similar sections which is not part of the invention and it comprises at least two rollers placed diametrically opposed to each other and each supplied with at least a deformation throat, said rollers defining a path.
  • each two rollers (3,4) have a corresponding deformation throat (30,40), being said deformation throats substantially complementary to the final shape and dimensions of the section (51) of the tube (5) at the end of the processing.
  • the present device comprises two or more couple of rollers (7 and 8, 9 and 10, 11 and 12, 13 and 14)aligned and where each subsequent couple of rollers present within the rollers constituting the same couple a shorter distance respect the preceding couple.
  • the shape of the throats of the couples of rollers (7 and 8, 9 and 10, 11 and 12, 13 and 14) have such a dimension to correspond to the deformation of the transversal section that we want to obtained, and in particular each subsequent couple of rollers present deformation throats with shape and dimensions different from the shape and dimensions of the preceding couple.
  • At least one of said rollers is motorized, or rather supplied with an engine able to transmit the rotational motion to the same roller.
  • rollers are motorized, or rather supplied with an engine, for example an electric motor, able to transmit the rotational motion to the same roller.
  • supporting means constituted by idle and/or motorized supporting cylinders on which the tube leans on. This way it is possible to bring and maintain the tube into the insertion position.
  • the motorized rollers will provide then to pull, during the process, automatically the tube without causing deflections on it.
  • the tube is sustained and/or moved between said rollers through a cable or a chain or similar that goes through the tube and is supported by an overhead crane, and/or by means of an overhead crane or similar able to grab the tube at the extremities.
  • FIG 1 it is represented a transversal solution 1 of a metallic tube for structural use.
  • a metallic tube for structural use.
  • Such tube has typically diameters that range from 100mm to 800mm and thickness that range from 6mm to 30mm.
  • the tubes to which the present invention is aimed at, are prevalently for structural use, or rather they constitute the supporting elements for constructions, as for example buildings or similar.
  • the tube's section is therefore deformed from a circular section 1 as fig. 1 to an elliptical or more generally round section, as section 2 shown in fig. 2 .
  • the rounding of the tube's section happens through a continuous and progressive deformation along a predefined transversal section of said tube.
  • the method and the device for the realization of the above method present two solutions, the first one, which is not part of the invention is shown in a simplified way in fig. 5 and the second one, according to the invention is shown in fig. 6 .
  • the rollers placed diametrically opposed to each other, define indeed a route of passage and deformation forced to the tube.
  • the tube during the processing passes through the two rollers 3 and 4 that supplied with deformation throats 30 and 40 shown in fig. 4 and complementary to the final shape and dimensions that shall approach the tube at the end of the processing.
  • the deformation throats 30 and 40 are realized in such a way that each throat realizes half of the ellipse.
  • the throats 30 and 40 present therefore an elliptical profile, and in particular in the first executive solution present an elliptical profile with shape and dimensions equal to the ones requested at the end of the processing, therefore, since the tube 5 in process from a circular section 50 will have to go through an elliptical or round section 52, the deformation throats 30 and 40 will have an inner profile that is complementary to the elliptical section 52 of the tube.
  • the throats 30, 40 of the rollers 3 and 4 are placed at a shorter distance than the diameter of the tube 50, in particular can be placed, in the case of a single run of the tube through the rollers, to a distance that is substantially equal to the shorter semiaxis of the ellipsis 51 (look also at figure 3 ).
  • the double direction arrow indicates that the tube can be realized in the first solution both with one run, and more runs.
  • the tube 5 is inserted between the rollers and during a first run between them, undergoes to a partial deformation.
  • the rollers 3 and 4 are then drawn up and the tube 5 goes again through the rollers 3 and 4 undergoing to a second deformation.
  • the process can be repeated a number of times, until the rollers 3 and 4 are placed at a minimum distance, corresponding to the realization of the deformation of the transversal section of the tube into an elliptical shape 51.
  • FIG. 6 it is shown an executive solution according to the invention, where it can be seen a first number of rollers 7 and 8, a second set of rollers 9 and 10, a third set of rollers 11 and 12, a forth set of rollers 13 and 14, the tube during the processing 6 and the deformation 60, 61, 62, 63, 64 of the transversal section of the tube 6 in correspondence of each couple of rollers, starting from the circular section 60 until the elliptical section 64.
  • each subsequent couple of rollers presents between the rollers, constituting the same couple, a shorter distance comparing to the preceding couple.
  • the terms preceding and subsequent are to be intended with reference to the direction of the tube between the rollers during the processing.
  • the shape of the throats of the couples of rollers 7 and 8, 9 and 10, 11 and 12, 13 and 14 have such a dimension to correspond to the deformation of the transversal section that we want to obtained, and in particular each subsequent couple of rollers present deformation throats with shape and dimensions different from the shape and dimensions of the preceding couple.
  • the tube during the processing is leant on supporting means, not illustrated comprising for example idle or motorized supporting cylinders on which the tube leans on.
  • the tube can be sustained and/or moved between said rollers through a cable or a chain or similar that goes through the tube and is supported by an overhead crane, or by means of an overhead crane or similar able to grab the tube at the extremities.
  • the method according to the present invention could also be used to obtain tubes with any section, in particular with a different shape from the elliptical section shown here as an example, simply by changing the shape of the throats 30 and 40, and comprising a throat's shape that is complementary to the requested shape, provided that the same does not present back drafts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (2)

  1. Ein Verfahren zur Herstellung von Rohren mit einem ovalen oder elliptischen oder ähnlichen Abschnitt, welches folgende Arbeitsschritte umfasst:
    - Vorbereitung eines Rohres mit einem runden Querschnitt entlang einer Bahn;
    - Verformung des besagten Rohres entlang seiner gesamten Länge in Längsrichtung durch eine Verformung, die in verschiedenen zeitlichen Momenten für jeden Rohrabschnitt entlang besagter Bahn ausgeübt wird, wobei der besagte Verformungsvorgang durch die Durchführung des besagten Rohres zwischen zwei rückwärts drehenden Rollen erzielt wird, die jeweils zu einander diametral entgegengesetzt sind und jede über mindestens eine Verformungseinschnürung verfügen und die besagten Rollen die besagte Bahn festlegen, wobei die besagte Verformung in Übereinstimmung mit dem zwischen den beiden Rollen (3,4) liegenden Querschnitt erfolgen muss und wobei jede der besagten zwei Rollen (3,4) mit einer entsprechenden Verformungseinschnürung (30,40) ausgestattet ist und wobei die besagten Verformungseinschnürungen im Wesentlichen die endgültige Form und sowie die endgültigen Abmessungen des Rohrabschnitts am Ende der Bearbeitung ergänzen und dadurch gekennzeichnet sind, dass die besagte Verformung des besagten Querschnitts des besagten Rohres (5) in verschiedenen Sequenzen des Rohres (5) zwischen den zwei Rollen (3,4) erfolgt, die zu einander zwischen der ersten und der letzten Sequenz des Rohres (5) über die besagten zwei Rollen (3,4) bewegt werden.
  2. Ein Verfahren zur Herstellung von Rohren mit einem ovalen oder elliptischen oder ähnlichen Abschnitt, nach Anspruch 1, dadurch gekennzeichnet, dass das besagte Verformungsverfahren des Rohres auf Auflagemitteln durchgeführt wird.
EP08103876A 2007-07-17 2008-05-08 Verfahren zur Herstellung von Metallrohren mit ovalem oder elliptischem Querschnitt Not-in-force EP2017019B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000081A ITPI20070081A1 (it) 2007-07-17 2007-07-17 Metodo e dispositivo per la fabbricazione di tubi metallici a sezione ovale ellittica o simili

Publications (2)

Publication Number Publication Date
EP2017019A1 EP2017019A1 (de) 2009-01-21
EP2017019B1 true EP2017019B1 (de) 2012-04-18

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Application Number Title Priority Date Filing Date
EP08103876A Not-in-force EP2017019B1 (de) 2007-07-17 2008-05-08 Verfahren zur Herstellung von Metallrohren mit ovalem oder elliptischem Querschnitt

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EP (1) EP2017019B1 (de)
AT (1) ATE553863T1 (de)
IT (1) ITPI20070081A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102896170B (zh) * 2011-12-31 2015-11-25 中山市奥美森工业有限公司 一种椭圆管机
CN102896175B (zh) * 2011-12-31 2015-05-13 中山市奥美森工业有限公司 一种椭圆管机的成型机构
CN109290404B (zh) * 2018-09-04 2020-03-31 陕西科技大学 一种椭圆筒节的卷制成型方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS613604A (ja) * 1984-06-18 1986-01-09 Nippon Steel Corp 異厚断面鋼管の製造方法
JPS6199502A (ja) * 1984-10-19 1986-05-17 Kawasaki Steel Corp 継目無管の圧延方法
JPH09239438A (ja) * 1996-03-07 1997-09-16 Nisshin Steel Co Ltd オーバル管の製造方法及びロール成形装置
JP3082678B2 (ja) * 1996-08-14 2000-08-28 住友金属工業株式会社 小径継目無金属管の製造方法
JPH11104710A (ja) * 1997-10-03 1999-04-20 Yoshitomi Onoda 継目無角形鋼管の製造方法
JP2001113306A (ja) * 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd 高合金継目無鋼管の製造方法およびそれに用いる圧延用孔型
FI113632B (fi) * 2002-10-22 2004-05-31 Outokumpu Oy Valssauslaitteisto

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ATE553863T1 (de) 2012-05-15
EP2017019A1 (de) 2009-01-21
ITPI20070081A1 (it) 2009-01-18

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