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EP0344570B1 - Procédé et dispositif de fabrication d'un tube en forme d'hélice - Google Patents

Procédé et dispositif de fabrication d'un tube en forme d'hélice Download PDF

Info

Publication number
EP0344570B1
EP0344570B1 EP89109206A EP89109206A EP0344570B1 EP 0344570 B1 EP0344570 B1 EP 0344570B1 EP 89109206 A EP89109206 A EP 89109206A EP 89109206 A EP89109206 A EP 89109206A EP 0344570 B1 EP0344570 B1 EP 0344570B1
Authority
EP
European Patent Office
Prior art keywords
tube
mandrel
tube portion
widening
tool
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
EP89109206A
Other languages
German (de)
English (en)
Other versions
EP0344570A2 (fr
EP0344570A3 (fr
Inventor
Hermann Fragge
Ewald Westerkamp
Felix Willenborg
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.)
Siekmann Fittings GmbH and Co KG
Original Assignee
Siekmann Fittings GmbH and Co KG
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 Siekmann Fittings GmbH and Co KG filed Critical Siekmann Fittings GmbH and Co KG
Publication of EP0344570A2 publication Critical patent/EP0344570A2/fr
Publication of EP0344570A3 publication Critical patent/EP0344570A3/fr
Application granted granted Critical
Publication of EP0344570B1 publication Critical patent/EP0344570B1/fr
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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/12—Bending tubes using mandrels or the like by pushing over a curved mandrel; by pushing 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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically

Definitions

  • the invention relates to a method for producing a coiled tubing according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 7.
  • a method and such a device are known from US Pat. No. 2,505,623.
  • the known method and the associated device can be used to produce coiled tubing with a slight curvature and / or moderate quality requirements, while the known method fails for further requirements.
  • coiled tubing is often used for tasks that require greater deformations and high quality in terms of dimensional accuracy and material structure, e.g. as eccentric screws for eccentric screw pumps, as drive elements for well drilling rigs, as screw pump and motor elements.
  • eccentric screws so far as they have not been turned or whirled out of solid material, have been welded together from sheet metal half-shells which are very complicated to form or have been formed by repeated pressing and pulling back of a tube into a conical die with resiliently mounted die parts.
  • the object of the invention is, starting from a mandrel bending method of the type considered at the outset, the production of coils of high quality and any slope in a continuous process, using the speed of work and the practical experience that exists in practice in the manufacture of pipe bends.
  • Another object of the invention is to provide an apparatus for carrying out such a method.
  • this object is achieved in a method with the features of claim 1.
  • the solution according to the invention is based on the knowledge that a working method of the type resulting from the prior art, as it is also based on the fundamentally similar method for producing pipe elbows, generally does not lead to usable results because the pipe is formed to the spiral in addition to the axial movement must perform a rotational movement, unless torsion or irregular flow processes are adversely affected, which affect the quality of the product. Only by the fact that the supplied pipe section already executes a rotational movement in relation to the mandrel in the spiral direction can a spiral with the manufacturing quality be achieved, as is known in the case of pipe bends which have been produced, for example, by the pipe bending process.
  • the rotational movement of the tube can be a free movement in that the mandrel is rotatably supported relative to the pressing device and / or the pressing device or its parts that come into contact with the tube.
  • a forced movement of the mandrel and / or the tube can also be predetermined, a coupling being established between the feed movement and the rotary movement.
  • the object of the invention is further achieved with a device according to claim 7.
  • the device realizes on the device-technical side what the method provides, on one side the expanding mandrel and on the other side the press bear in relation to each other in order to achieve the desired rotational mobility. It is of course sufficient if the bearing to be provided for the pressure on the rear end of the tube can be rotated, while the mobility of the press bear can otherwise be limited to a re-axial movement.
  • a straight pipe section which can consist of a seamless or welded pipe section, is pressed cold or warmed up to a deformation temperature by means of a mandrel which is helically coiled in the specified geometry leaves this mandrel with precise surface dimensions and a perfect interior and surface structure.
  • the pipe section can advantageously be heated in the form that has already proven itself when bending pipe sections, that is to say by heating by means of burner flames from an annular nozzle which heats the pipe where it is just passing the mandrel, or by inductive heating in this very area.
  • the device designated in FIG. 1 as a whole for deforming pipes has, in the manner known in principle from presses for producing pipe bends, a press frame 2 with various devices for adjusting and supporting tools, with a press bear 3 along one through the press bear 3 shaft passed through and anchored in the frame 4 in the direction of a mandrel 5 with press forces up to an order of magnitude of approximately 1000 tons.
  • the press bear 3 presses against an end face of a pipe section 6 (or also several pipe sections lined up one behind the other on the shaft 4) in order to move it over the mandrel 5.
  • the mandrel 5 has a complex shape, which basically leads to a widening of the tube and to a helical shape, and at the same time the shape of the mandrel can influence the flow of the material in the circumferential direction and thus the distribution of wall thickness in the tube wall .
  • the mandrel which leads to an overlap of deformations in the sense of widening, a helical curvature and a change in wall thickness, the person skilled in the art can create a precision tool which produces an evenly coiled tube in a single operation.
  • the tube can be deformed in the cold state.
  • tubes of higher strength or greater wall thickness are regularly thermoformed, for which purpose an induction coil 7 is provided around the mandrel 5 in the present case, which heats the tube 6 each time it passes through the deformation region.
  • the tube which adapts to the inside of the coiled shape of the expanding mandrel 5, also carries out a rotary movement at the end in addition to the feed movement. It is expediently provided that the supplied tube 6 also rotates with respect to the shaft 4, so that the tube is not subject to torsional deformations during the shaping.
  • the press bear 3 encloses the shaft 4.
  • the rotational mobility of the tube 6 is created in that the press bear 3 is preceded by a rotary bearing 8 which presses against an end face of the tube 6 with a ball-bearing pressure ring 9. At the same time, the tube 6 is centered by an annular collar 10 with a conical inner surface 11.
  • Fig. 3 it can first be seen in an oblique view that the mandrel 5 can be divided into different sections in the longitudinal direction.
  • a section of smaller diameter is intended to establish the connection with the shaft 4 and to achieve a longitudinal guide on the outside with respect to the pipe to be deformed.
  • Such a guide zone 12 of the mandrel 5 is followed by a comparatively short expansion zone 13, in which a tube pressed over the mandrel undergoes the major part of its deformation.
  • a tube pressed over the mandrel undergoes the major part of its deformation.
  • the expansion zone 13 is followed by a calibration zone 14, in which the mandrel carries out a fine adjustment and calibration of the tube with an essentially constant cross-section and constant spiral curvature and also retrospectively aligns the tube during the expansion process on the expansion zone 13.
  • 4 and 5 illustrate the zones described above in the side view and axial view.
  • a longitudinal axis is to be assigned to the mandrel, which initially represents a cylinder axis in the guide zone 12 in the calibration zone 14 continues as a screw axis. In the present exemplary embodiment, this axis, designated 15, always runs within the mandrel.
  • a tube made with such a mandrel 5 has an outer circular contour, which can be assigned to a suitable inner cylinder, for example in the case of eccentric pumps, and that the tube helix produced is a precisely shaped free lumen 17 within the tube cross section, even in the case of long designs Circle around the axis 15 shows.
  • FIG. 8 shows an embodiment with an oval cross section, as can also be produced in one operation without post-processing.
  • the tube can be rotatably mounted relative to the press bear 3.
  • the shaft 4 and / or the mandrel can also be rotatably supported, in which case a rotatable bearing of the tube can then be dispensed with.
  • a driven, positively controlled rotational movement between the tube and the mandrel is generated, be it that a rotating driven ring plate is connected upstream of the press bear or it is also that the shaft is rotated according to the feed of the press bear.
  • a device for deforming pipes designated in its entirety by 19 in FIG. 9, the parts of which correspond to the device parts previously identified and have the same reference numerals, has a press frame 2 with various devices for adjusting and supporting tools, with a press bear 3 along one the press bar 3, which is guided through and anchored in the frame, can be moved in the direction of a tool 20 with press forces of up to approximately 1000 tons.
  • the press bear 3 presses against a rear end face of a pipe section 6 (or also several such pipe sections lined up in succession on the shaft 4) in order to move it through the tool 20.
  • the pipe sections 6 fed to the tool 20 in a cylindrical straight shape leave the tool on the side facing away from the press bear 3 as a pipe helix 21.
  • the tool 20 is illustrated in greater detail in FIGS. 10 to 13.
  • the tool 20 comprises an outer tool 22 with a horizontally extending through hole 23 (see FIG. 12), which at least in an end region 24, preferably also in a central region, already forms the precise outer shape of the desired tube coil 21.
  • an inlet region 25 of the through bore 23 can be cylindrical or weakly coiled in order to facilitate insertion. It can also be dimensioned to an oversize in cross-section in order to facilitate the running-in of the pipe sections 6 with a light funnel shape.
  • the outer shape 22 is suitable for pressing a tube section fed in the direction of an axis 26 out of the cylindrical, straight blank shape into a tube coil, which defines an extremely precise outer shape.
  • the outer shape can be designed to be highly resilient by making it correspondingly large thanks to the material used on the outside, whereby the dimensions are not limited.
  • an outer tool can absorb and dissipate a lot of heat, so that heat problems can be managed relatively well - especially since the high pressure resistance of the outer tool allows cold deformations in areas in which hot deformations are regularly preferred for other pipe forming.
  • the outer tool 22 is supplemented by an inner tool in the form of an expanding mandrel 27, which adjoins the continuous shaft 4.
  • the expanding mandrel 27 begins with an expanding zone 28 in the form of a truncated cone, which is adjoined by a cylindrical or weakly coiled section 29, which then runs into a concentrically in the coiled through bore 24, so that it has a precisely predetermined uniform air gap 30 to the external tool forms.
  • This air gap defines the wall thickness of the pipe coil 21 to be produced, at the same time the pipe coil is formed smoothly and precisely both on the outer and on the inner lateral surface.
  • This deformation will initiated in that the pipe section 6 is expanded to the desired extent in the expansion zone 28, the additional molding process being able to improve the strength of the pipe, but in particular eliminating tolerances of the pipe section 6.
  • FIGS. 14 and 15 Another embodiment of a tool 31 according to FIGS. 14 and 15 likewise makes use of an outer tool and an inner tool, the outer tool being intended to be the same as that according to FIGS. 10 and 15 and accordingly also being given the reference symbol 22.
  • a mandrel 32 serves as the inner tool, which is not designed as an expanding mandrel, but as a mandrel of constant cross section. This mandrel does not have a cross-sectional effect, rather its cross-section differs only slightly from the cross-section of the shaft 4, to which it adjoins flush.
  • the mandrel 32 can be designed so that it is slightly larger from its shaft-side start to the free end in order to bring about a precise inner wall formation in the tube helix 21, but it can also be predetermined with an undersize compared to the inner cross section of the tube in order to maintain a play in movement, which restricts the mandrel to management tasks, but largely leaves the forming of the coiled tubing to the external tool.
  • a pressure bearing 8 is provided for the press bear for receiving the end of the pipe section abutting the press bear 8.
  • a pressure transfer via internal rolling elements expediently ensures easy mobility.
  • the deformation of the pipe sections can take place both in the cold and also take place when hot.
  • the pipe is expediently heated by a heating device (not shown) directly in front of the outer tool 22, various heating devices being available to the person skilled in the art, for example by means of gas burners or by means of inductive heating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (13)

  1. Procédé de fabrication d'un tube en forme d'hélice, selon lequel un segment de tube (6) est pressé sur une presse (1) dans le sens de l'axe du tube par-dessus un mandrin d'élargissement (5, 27, 32), qui présente une courbure hélicoïdale au moins dans une zone d'extrémité (14), caractérisé en ce que le segment de tube (6) effectue un mouvement de rotation autour de son axe par rapport au mandrin d'élargissement (5, 27, 32).
  2. Procédé suivant la revendication 1, caractérisé en ce que le segment de tube (6) est monté mobile à rotation pour le pressage.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que le mandrin d'élargissement est monté mobile à rotation.
  4. Procédé suivant la revendication 1, caractérisé en ce que le segment de tube (6) est mû en rotation pendant le pressage pour s'adapter au pas de l'hélice.
  5. Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le segment de tube (6) est chauffé avant ou pendant la déformation.
  6. Procédé suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que le segment de tube (6) est pressé, en outre, à travers une forme creuse (23) située dans un outil extérieur (22) qui agit extérieurement sur le segment de tube (6) et qui est conformée comme un passage de traversée à courbure hélicoïdale.
  7. Appareil pour l'exécution du procédé suivant l'une quelconque des revendications 1 à 6, à l'aide d'un mandrin d'élargissement (5, 27, 32) présentant une courbure hélicoïdale, au moins dans une zone d'extrémité, et par-dessus lequel sont pressés des segments de tube droits dans le sens de l'élargissement, dans lequel le mandrin d'élargissement est monté sur une presse (1) par l'intermédiaire d'une tige (4) portant au moins un segment de tube (6), et dans lequel une masse de pressage (3) déplaçable le long de la tige attaque l'arrière du segment de tube au moyen d'un palier (8), caractérisé en ce que le mandrin d'élargissement (5, 27, 32) et/ou la masse de pressage (3), au moins dans la zone de son palier (8), sont conçus pour pouvoir tourner l'un par rapport à l'autre.
  8. Appareil suivant la revendication 7, caractérisé par un palier (8), par l'intermédiaire duquel la masse de pressage (3) attaque l'arrière du segment de tube (6).
  9. Appareil suivant la revendication 7, caractérisé par un anneau de pression qui attaque l'arrière du segment de tube (6), et qui, par rapport à la masse de pressage, est entraîné en un mouvement de rotation en fonction de l'avancement.
  10. Appareil suivant la revendication 7, caractérisé en ce que la tige (4) est montée à rotation.
  11. Appareil suivant l'une quelconque des revendications 7 à 10, caractérisé en ce qu'un outil extérieur (22) présentant un passage de traversée à courbure hélicoïdale (23) est associé au mandrin (5, 27, 32).
  12. Appareil suivant la revendication 11, caractérisé en ce que le passage de traversée (23) présente une section transversale qui va en se rétrécissant.
  13. Appareil suivant la revendication 11 ou 12, caractérisé en ce qu'un dispositif de chauffage orienté vers le segment de tube (6) qui avance est installé en amont de l'outil extérieur (22).
EP89109206A 1988-05-30 1989-05-23 Procédé et dispositif de fabrication d'un tube en forme d'hélice Expired - Lifetime EP0344570B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3818315 1988-05-30
DE3818315 1988-05-30
DE3822541 1988-07-04
DE3822541 1988-07-04

Publications (3)

Publication Number Publication Date
EP0344570A2 EP0344570A2 (fr) 1989-12-06
EP0344570A3 EP0344570A3 (fr) 1991-02-06
EP0344570B1 true EP0344570B1 (fr) 1992-12-09

Family

ID=25868596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109206A Expired - Lifetime EP0344570B1 (fr) 1988-05-30 1989-05-23 Procédé et dispositif de fabrication d'un tube en forme d'hélice

Country Status (3)

Country Link
US (1) US4951493A (fr)
EP (1) EP0344570B1 (fr)
DE (1) DE58902937D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1588785A2 (fr) 2004-04-20 2005-10-26 Erne Fittings GmbH Element de tube hélicoidal

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323759A1 (de) * 1993-07-15 1995-01-19 Artemis Kautschuk Kunststoff Verfahren zur Herstellung von Rotoren für Exzenterschneckenpumpen
GB0024909D0 (en) * 2000-10-11 2000-11-22 Springer Johann Drill string member
USD494197S1 (en) 2003-07-28 2004-08-10 Donato L. Ricci Slitting saw
US7137281B1 (en) 2004-02-23 2006-11-21 Mccorvey Robert L Process and apparatus for forming oversized circular pipe
DE102004030327A1 (de) * 2004-06-23 2006-01-12 Erne Fittings Gmbh Verfahren und Aufweitdorn zur Fertigung eines Rohrelements
US20080128583A1 (en) * 2006-07-17 2008-06-05 Doug Smoljo Form and method and apparatus for making a form
CN113894171B (zh) * 2021-10-13 2022-12-02 北京科技大学 螺旋杆三辊驱动挤压成形装置及工艺
CN113894172B (zh) * 2021-10-13 2022-11-15 北京科技大学 螺旋杆双辊驱动挤压成形装置及工艺
CN113894170B (zh) * 2021-10-13 2022-11-15 北京科技大学 空心螺旋杆双辊驱动挤压成形装置及工艺
CN113894173B (zh) * 2021-10-13 2022-11-15 北京科技大学 空心螺旋杆三辊驱动挤压成形装置及工艺

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US1973687A (en) * 1932-02-23 1934-09-11 Bolton C Moise Tube mill
US2505623A (en) * 1948-07-15 1950-04-25 Tube Turns Inc Apparatus for manufacture of helical coils of tubing
US2936019A (en) * 1956-09-10 1960-05-10 Toledo Heater Company Apparatus for producing tube bends
FR2155827A1 (fr) * 1971-10-08 1973-05-25 Sigma Lutin
US4306437A (en) * 1979-12-10 1981-12-22 Grotnes Metalforming Systems, Inc. System for planishing metal pipe
CS231266B1 (en) * 1981-12-16 1984-10-15 Josef Svercl Forming claws for making of spiral parts from tubular half-products
AT384966B (de) * 1986-06-09 1988-02-10 Ver Edelstahlwerke Ag Verfahren zur herstellung eines hohlkoerpers mit schrauben- bzw. wendelartiger innen- und aussenkontur und vorrichtung zur durchfuehrung des verfahrens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1588785A2 (fr) 2004-04-20 2005-10-26 Erne Fittings GmbH Element de tube hélicoidal
EP1588785A3 (fr) * 2004-04-20 2005-11-02 Erne Fittings GmbH Element de tube hélicoidal
DE102004019698A1 (de) * 2004-04-20 2005-11-24 Erne Fittings Gmbh Gewendeltes Rohrelement
DE102004019698B4 (de) * 2004-04-20 2010-06-10 Erne Fittings Gmbh Gewendeltes Rohrelement

Also Published As

Publication number Publication date
US4951493A (en) 1990-08-28
DE58902937D1 (de) 1993-01-21
EP0344570A2 (fr) 1989-12-06
EP0344570A3 (fr) 1991-02-06

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