EP0695592B1 - Verfahren und Vorrichtung zum Herstellen eines metallischen Wellrohres - Google Patents

Verfahren und Vorrichtung zum Herstellen eines metallischen Wellrohres Download PDF

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Publication number
EP0695592B1
EP0695592B1 EP95401575A EP95401575A EP0695592B1 EP 0695592 B1 EP0695592 B1 EP 0695592B1 EP 95401575 A EP95401575 A EP 95401575A EP 95401575 A EP95401575 A EP 95401575A EP 0695592 B1 EP0695592 B1 EP 0695592B1
Authority
EP
European Patent Office
Prior art keywords
pipe
tube
mandrel
creation
fact
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.)
Expired - Lifetime
Application number
EP95401575A
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English (en)
French (fr)
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EP0695592A1 (de
Inventor
François Grosjean
Michel Huvey
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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Filing date
Publication date
Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0695592A1 publication Critical patent/EP0695592A1/de
Application granted granted Critical
Publication of EP0695592B1 publication Critical patent/EP0695592B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces

Definitions

  • the present invention relates to a method and the means for implementing the method for manufacturing by magnetoforming elements of tubes with corrugated walls at from metal tubes whose generatrices are substantially rectilinear and parallel to the longitudinal axis.
  • the basic metal tubes are cylindrical.
  • Corrugated metal tubes made from metal strips can be used formed by rollers, spiraled on a mandrel and welded continuously to form a waterproof tube with undulations, therefore increased flexibility by the shape of the ripples.
  • the weld bead remains waterproof, the problem has been solved for manufacture a metal tube, therefore perfectly gas-tight, and flexible thanks to to the more or less wavy shape of the generators.
  • this manufacturing is slow and requires a fairly heavy manufacturing facility and welding is a technical solution delicate implementation and control.
  • the resistance to bending fatigue is often reduced due to welding and this type of manufacturing does not give good results than for certain types of metals.
  • the magnetoforming method is already used on elementary parts for deform or assemble by crimping, welding, or plating. This method can be done by compression of the metal or on the contrary by expansion, according to the degree of deformation. But no solution is provided in the case of the formation of the surface of a metal tube several meters long.
  • the magnetoforming process is well known and will therefore not be described here. We recalls that it consists in sending a very short electrical impulse in a electromagnetic coil arranged near the walls of the workpiece.
  • a electromagnetic coil arranged near the walls of the workpiece.
  • the variation of the electromagnetic field produced by the coil created in the walls of the tube in conductive metal an induced current which, by interaction with the current flowing in the coil (Laplace's law) exerts on the walls of the tube forces equivalent to a electromagnetic pressure, said pressure deforming the tube by pressing the walls against a form matrix.
  • the tube is deformed in a groove or a helical boss around the axis of the tube and the forming means are displaced longitudinally relative to the tube by a rotation of said forming means about the axis of the tube.
  • a first activation of the means for creating a magnetic field can partially deform the tube over a portion of the circumference of the tube relative to the desired final deformation, and after having displaced the forming means by rotation, a second activation can end the deformation on at least part of said partially deformed portion.
  • the metal tube may comprise at least one tube made of non-deformable material by magnetoforming and a tube adapted to be deformed by magnetoforming, said tube deformable by magnetoforming being interposed between the tube not deformable by magnetoforming and the means for creating a magnetic field.
  • the invention also relates to a device for forming a metal tube by electromagnetism comprising means for creating an electromagnetic field and means of forming.
  • the tube is placed between the means of creating a field electromagnetic and the forming means, and the device comprises means for displacement of the tube relative to the means for creating an electromagnetic field and to the forming means longitudinally along the axis of the tube in order to deform the tube step by step.
  • the forming means comprise a mandrel whose outside diameter is slightly smaller than the inside diameter of said tube, and the mandrel has on its outer surface a helical groove.
  • the device according to the invention comprises means for moving the tube longitudinally with respect to the mandrel comprising means for rotating the said mandrel relative to the tube and the means for creating an electromagnetic field have means of connection with the mandrel so that their respective positions remain fixed transversely to the tube.
  • the groove may have zero depth at its starting point and may deepen substantially regularly over a portion of helix length less than the corresponding length in about one step until reaching the corresponding depth to the constant shape of said groove which continues in a helix.
  • the cylindrical surface of the mandrel may have a determined length in order to center the tube properly on the mandrel while not not blocking the tube when subjected to axial axial deformation resulting from different radial deformation rates.
  • the end of the mandrel, on the origin side of the groove, can be chamfered or has a large radius leave.
  • Figure 1 shows schematically a preferred embodiment of the method and the device according to the invention.
  • the reference 1 locates the electromagnetic coil of shape appreciably annular and placed around a tube 2, the part located to the right of the coil is not still formed, while the part of the tube to the left of the coil has been formed and has corrugations 3.
  • Forming means or mandrel 4 are placed inside of the tube.
  • the shape of the mandrel 4 in zone 5 serves as a support and a matrix for the deformation of the tube 2 when the coil 1 is activated by an electric current.
  • the present invention recommends a method and a device for avoiding these disadvantages.
  • the width of the coil must be such that the electroforming is done at the first electrical pulse only on a single trough of so that the material that forms the hollow can at best come from a displacement of the tube in the direction of a shortening.
  • the mandrel and the reel are moved the length of a hollow to be able to form a second hollow at the continuation of the previous one.
  • the deformation over the entire tube thus continues step by step.
  • the mandrel In the case of a circular ripple, the mandrel must be designed in a retractable way so that it can to be released from the already formed hollows.
  • the present invention is preferably applied to ripples arising a groove or a boss, not circular (that is to say a ring around the tube) but helical.
  • Figures 2 and 4 illustrate a mandrel 6, seen in perspective in Figure 2 and in top view in Figure 4 according to arrow 7 ( Figure 2). It should be noted that a certain number of lines or dotted lines, helically or longitudinally have no geometric meaning but that they result from the CAD drawing mode and that they have been kept only for better readability of surfaces and volumes.
  • a trihedron Ox, y, z identifies the mandrel 6 of axis Ox.
  • the mandrel 6 has a part cylindrical 8 whose diameter is close to the inside diameter of the tube 2 ( Figure 1).
  • the throat 11 originates from line 10 and has a little more than two helix pitches on the mandrel.
  • the end of the cylindrical part 8 is machined according to a leave 9 so that this part which enters the tube not yet formed either in contact with the inner surface of the tube in providing as little friction as possible.
  • the part 8 serves as axial guidance of the tube on the mandrel and vice versa, but the tube shortens appreciably following the radial deformations produced by the electromagnetic field of the coil.
  • Figure 4 is a top view of the mandrel 6 according to arrow 7 ( Figure 2), that is to say that the wavy contours shown in Figure 4 are those of the intersection of the plane Oxy with the mandrel.
  • Line 11 is the starting point of the helical groove which here takes a little more than two steps to lead into zone 12 of the mandrel.
  • Line 13, diametrically opposite to the point of origin 11 of the groove represents the shape of the groove such that it continues helically until 12.
  • the bottom of throat is cylindrical.
  • the throat is deepened regularly on the half circumference between 11 and 13. However, from 13, the groove has a constant profile until the end of the mandrel.
  • the tube 2 not formed, positioned to the point referenced 14 of the mandrel.
  • the coil 1 surrounds the end of the tube 2.
  • Figures 5 and 6 show the sections of the mandrel according to the Oxu and Oxv plans referenced in Figure 2.
  • Figure 5 shows the section of the mandrel according to the Oxu plan inclined at 60 ° to the Oxy plane.
  • Line 15 shows the profile of the groove in this plane, fairly shallow profile.
  • Figure 6 shows the section of the mandrel according to the Oxv plane inclined at 60 ° to the Oxu plane.
  • Line 16 shows the profile of the groove in this plane, profile less deep than the final profile, but nevertheless fairly close.
  • the profiles diametrically opposite to the groove of increasing depth are connected on the right on a cylindrical part of the mandrel. This form is advantageous because it promotes shortening of the tube. This function will be explained in more detail below.
  • FIG. 4 represents the first step of electromagnetic forming on a tube 2 fully cylindrical.
  • the tube is brought in and positioned by means conventional.
  • the coil 1 and the mandrel 6 are linked, for example by a frame and an axis which carries the mandrel, said axis having a certain length which will allow penetration or the extraction of the mandrel with respect to the tube as it is formed and the coil is thus linked to the mandrel so that it remains in the same radial plane.
  • the tube 2 brought to point 14 of the mandrel covers several zones, starting from the right of the mandrel: a cylindrical part, half a step from the deep groove increasing over a half-turn, a certain portion of groove having the final profile.
  • the tube 2 is pressed against the mandrel by matching its shape, that is to say: a groove with variable depth and a groove with a final profile.
  • This first shot does not no problem of elongation of the material because no prior deformation blocks the possibility of the tube moving longitudinally, either from the right or the left referring to figure 4.
  • the mandrel can only be moved relative to the tube in rotation, according to the thread represented by the throat opening.
  • the mandrel By rotating the mandrel, here counterclockwise since the propeller is on the right, while blocking the rotation of the tube around its axis, the mandrel is moved to the right by a distance directly related to the angle of rotation and the pitch of the propeller. For example, a turning half a turn will move the mandrel back half a step.
  • the deformation of the tube continues by repeating this second step.
  • the adaptation must also take into account the geometry of the tube and its material.
  • the invention is not limited to the example described here, other applications can be implemented.
  • the electromagnetic forming method may not apply.
  • We may in this case interpose between the tube bad conductor of electricity and the coil, a good conductor tube so that the deformation of this tube, called propellant in the profession, causes the deformation of the bad or not conductive tube.
  • Corrugated tube portions manufactured within the limit of penetration of the mandrel in the tube these can be welded together to form a continuous tube more great length.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (7)

  1. Verfahren zum Umformen eines metallischen Rohres durch Elektromagnetismus, die folgenden Stufen umfassend:
    man bringt eine Länge eines metallischen Rohres (2) zwischen Mittel zur Erzeugung eines magnetischen Feldes (1) und Umformmittel (4) ein, wobei diese Umformmittel im Inneren dieses Rohrstücks sich befinden und diese Mittel zur Erzeugung eines magnetischen Feldes die Außenfläche des Rohres umgeben, dadurch gekennzeichnet, dass das Rohr gemäß einer nutartigen Vertiefung oder einer Erhebung in Spiral- oder Wendelform um die Achse des Rohres geformt wird,
    man aktiviert elektrisch die Mittel zur Erzeugung eines magnetischen Feldes zur Erzeugung einer Verformungsenergie dieses Teiles (5), wodurch die Wandungen dieses Rohres an diese Formmittel angelegt werden,
    man ordnet in Längsrichtung diese Mittel zur Erzeugung eines magnetischen Feldes sowie diese Mittel zur Umformung an, um sie an einem anderen Längenstück des nicht verformten Rohres anzusetzen, und zwar durch eine Drehung dieser Umformmittel um die Achse des Rohres.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine erste Aktivierung der Mittel zur Erzeugung eines magnetischen Feldes teilweise das Rohr über einen Umfangsteil des Rohres, bezogen auf die gewünschte endgültige Verformung, verformt, dass nach Verschiebung oder Bewegung der Umformmittel durch eine Rotation eine zweite Aktivierung die Verformung über wenigstens einem Teil dieses partiell verformten Rohrstücks beendet.
  3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dieses metallische Rohr wenigstens ein Rohr aus einem durch magnetische Formung nicht formbaren Material und ein Rohr umfasst, das so ausgelegt ist, dass es durch Magnetformung verformt werden kann, wobei dieses verformbare Rohr zwischengeschaltet ist zwischen das nicht verformbare Rohr und die Mittel zur Erzeugung eines magnetischen Feldes.
  4. Vorrichtung zur Umformung eines metallischen Rohres durch Elektromagnetismus, Mittel zur Erzeugung eines elektromagnetischen Feldes sowie Mittel zur Umformung umfassend, wobei das Rohr zwischen die Mittel zur Erzeugung eines elektromagnetischen Feldes und die Formmittel angeordnet wird und wobei Mittel zur Verschiebung oder Bewegung dieses Rohres relativ zu den Mitteln zur Erzeugung eines elektromagnetischen Feldes und den Formmitteln in Längsrichtung gemäß der Achse des Rohres zur schrittweisen Verformung des Rohres angeordnet sind, wobei diese Formmittel einen Dorn umfassen, dessen Außendurchmesser geringfügig kleiner als der Innendurchmesser dieses Rohres ist, dieser Dorn auf seiner Außenfläche eine spiral- oder wendeiförmige Nut aufweist, dadurch gekennzeichnet, dass sie Mittel zur Bewegung oder Verschiebung des Rohres in Längsrichtung, bezogen auf den Dorn, umfasst und Mittel zur Drehung dieses Dorns bezüglich des Rohres aufweist, und dass die Mittel zur Erzeugung eines elektromagnetischen Feldes Mittel zur Verbindung mit dem Dorn umfassen, damit ihre jeweiligen Positionen fest quer zum Rohr verbleiben.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Nut oder Vertiefung eine Tiefe gleich null an ihrem Ausgangspunkt hat und sich im wesentlichen regelmäßig über einen Teil der Wendel- oder Schraubenlänge vertieft, die geringer als die entsprechende Länge um etwa einen Schritt ist, bis die Tiefe entsprechend der konstanten Form dieser Nut, die wendel- oder schraubenförmig sich fortsetzt, erreicht ist.
  6. Vorrichtung nach einem der Ansprüche 4 bis 5, dadurch gekennzeichnet, dass auf der Seite des Nutursprungs die Zylinderfläche des Dorns eine bestimmte Länge hat, damit in zweckmäßiger Weise das Rohr auf dem Dorn zentriert wird und dabei das Rohr nicht blockiert wird, wenn es Differentialaxialverformungen ausgesetzt ist, die aus in Radialrichtung unterschiedlichen Verformungsgraden resultieren.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das Ende des Dorns auf der Anfangsseite der Nut abgeschrägt ist und eine Auskehlung großen Radius' umfasst.
EP95401575A 1994-08-02 1995-06-29 Verfahren und Vorrichtung zum Herstellen eines metallischen Wellrohres Expired - Lifetime EP0695592B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409680 1994-08-02
FR9409680A FR2723329B1 (fr) 1994-08-02 1994-08-02 Methode et dispositif pour fabriquer un tube metallique ondule

Publications (2)

Publication Number Publication Date
EP0695592A1 EP0695592A1 (de) 1996-02-07
EP0695592B1 true EP0695592B1 (de) 2001-12-12

Family

ID=9466078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401575A Expired - Lifetime EP0695592B1 (de) 1994-08-02 1995-06-29 Verfahren und Vorrichtung zum Herstellen eines metallischen Wellrohres

Country Status (7)

Country Link
US (1) US5619878A (de)
EP (1) EP0695592B1 (de)
AU (1) AU689890B2 (de)
BR (1) BR9503520A (de)
DE (1) DE69524496T2 (de)
FR (1) FR2723329B1 (de)
NO (1) NO307819B1 (de)

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US5692853A (en) * 1995-11-27 1997-12-02 Curtiss Wright Flight Systems Inc. Threaded joint construction and rod assembly incorporating same
US5927344A (en) * 1996-01-03 1999-07-27 Nobileau; Philippe Subsea flexible pipe
DE19604311A1 (de) * 1996-02-07 1997-08-14 Ralph Peter Dr Ing Hegler Verbundrohr mit Muffe und Verfahren zu seiner Herstellung
GB2379996B (en) * 2001-06-05 2004-05-19 Tayside Flow Technologies Ltd Flow means
GB2369797B (en) * 2001-11-20 2002-11-06 Tayside Flow Technologies Ltd Helical formations in tubes
AUPR982302A0 (en) * 2002-01-03 2002-01-31 Pax Fluid Systems Inc. A fluid flow controller
US20060135340A1 (en) * 2002-07-30 2006-06-22 Cheang Hong N P Spherical nano-composite powder and a method of preparing the same
EP1552837A1 (de) * 2002-08-01 2005-07-13 Chugai Seiyaku Kabushiki Kaisha Antipsoriasis-mittel
JP4136802B2 (ja) * 2002-09-27 2008-08-20 株式会社神戸製鋼所 ビード付き円筒形リングの製造方法
GB0309616D0 (en) 2003-04-28 2003-06-04 Angiomed Gmbh & Co Loading and delivery of self-expanding stents
GB0315714D0 (en) * 2003-07-04 2003-08-13 Tayside Flow Technologies Ltd An internal formation for a conduit
GB0322511D0 (en) * 2003-09-25 2003-10-29 Angiomed Ag Lining for bodily lumen
US20060260374A1 (en) * 2005-05-23 2006-11-23 Flex-Weld, Inc. Hydroforming machine
GB0816965D0 (en) * 2008-09-16 2008-10-22 Angiomed Ag Stent device adhesively bonded to a stent device pusher
GB0901496D0 (en) 2009-01-29 2009-03-11 Angiomed Ag Delivery device for delivering a stent device
EP2415537A4 (de) * 2009-03-26 2013-01-30 Fundacion Labein Formvorrichtung und verfahren zum erhalt von lokalen verformungen in offenen profilen
GB0909319D0 (en) 2009-05-29 2009-07-15 Angiomed Ag Transluminal delivery system
CN103861898B (zh) * 2012-12-07 2016-09-21 中国石油化工股份有限公司 用于膨胀管件的电磁整形装置及方法
DE102013006171B4 (de) 2013-04-10 2015-04-16 Ulrich Bruhnke Verfahren und Anlage zur Herstellung von Blechen aus strangförmigen Profilen
CN103978086A (zh) * 2014-05-28 2014-08-13 湘潭大学 一种采用电磁预变成形技术加工波纹状管件的工艺
CN105458058B (zh) * 2014-09-11 2017-11-28 首都航天机械公司 一种缩小或消除多层波纹管层间间隙的方法
CN104874693B (zh) * 2015-05-29 2016-11-09 中国建筑技术集团有限公司 矩形薄壁钢管波纹成型夹具及其使用方法
CN105798102B (zh) * 2016-04-29 2018-06-26 苏州大学 管坯起皱装置
CN109848280B (zh) * 2019-03-13 2020-07-31 中南大学 一种波纹管的分区电磁成形方法及成形装置
CN110052526B (zh) * 2019-05-21 2021-02-23 哈尔滨工业大学 一种螺纹管加工装置及其加工方法

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FR2414966A1 (fr) * 1977-12-26 1979-08-17 Barras Provence Outil pour fixation de pieces le long de tubes
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Also Published As

Publication number Publication date
AU689890B2 (en) 1998-04-09
DE69524496D1 (de) 2002-01-24
BR9503520A (pt) 1996-05-28
EP0695592A1 (de) 1996-02-07
NO953028D0 (no) 1995-08-01
US5619878A (en) 1997-04-15
DE69524496T2 (de) 2002-05-16
FR2723329A1 (fr) 1996-02-09
FR2723329B1 (fr) 1996-09-13
NO953028L (no) 1996-02-05
AU2339995A (en) 1996-02-15
NO307819B1 (no) 2000-06-05

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