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EP0178721B1 - Method and device for manufacturing helical tubes - Google Patents

Method and device for manufacturing helical tubes Download PDF

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Publication number
EP0178721B1
EP0178721B1 EP85201601A EP85201601A EP0178721B1 EP 0178721 B1 EP0178721 B1 EP 0178721B1 EP 85201601 A EP85201601 A EP 85201601A EP 85201601 A EP85201601 A EP 85201601A EP 0178721 B1 EP0178721 B1 EP 0178721B1
Authority
EP
European Patent Office
Prior art keywords
mandrel
tube
rollers
helical
feed sleeve
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
Application number
EP85201601A
Other languages
German (de)
French (fr)
Other versions
EP0178721A1 (en
Inventor
Ernst Dieter Ebener
Hans Günter Mörtel
Friedrich Wilhelm Hohmann
Udo Kurt Zolnowski
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.)
EBENER GmbH
GEA Group AG
Original Assignee
EBENER GmbH
Metallgesellschaft AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6248342&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0178721(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by EBENER GmbH, Metallgesellschaft AG filed Critical EBENER GmbH
Priority to AT85201601T priority Critical patent/ATE35096T1/en
Publication of EP0178721A1 publication Critical patent/EP0178721A1/en
Application granted granted Critical
Publication of EP0178721B1 publication Critical patent/EP0178721B1/en
Expired 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form

Definitions

  • the invention relates to a method for producing a helical tube from a straight tube, which is helically wound over a rotated mandrel, the mandrel being designed to be dismantled and having a helical groove on its cylindrical surface, into which the tube rotates when the mandrel is rotated by means of displaceable rollers is pressed in, and the helical tube is pulled off the disassembled mandrel with reduced diameter, and a device for this.
  • Such a method and the associated device are known from FR-A-2 532 565, the mandrel being arranged on a carriage and not only being rotated in use but also being moved in the longitudinal direction.
  • the invention has for its object not to move the mandrel in the longitudinal direction and to produce very evenly coiled tubes.
  • this is done according to the invention in that the rollers are designed to be displaceable and are connected to a feed sleeve encompassing the mandrel, the sleeve remaining rotationally fixed when the mandrel is rotated and being axially displaced.
  • the feed sleeve and the rollers are displaced parallel to the fixed axis of the mandrel during the bending process, the tube being pressed into the helical groove of the mandrel, thereby producing a uniformly coiled tube.
  • This method also makes it possible to dispense with heating or heating the straight tube to facilitate bending.
  • One roller may be sufficient to press the tube into the helical groove, but usually several rollers are used.
  • the rollers are expediently rotatably attached to a connecting rail, and the connecting rail is rigidly connected to the feed sleeve.
  • the feed sleeve preferably has sliding balls on its inside, which run in the spiral groove of the mandrel. These sliding balls reduce the friction when the feed sleeve moves along the mandrel without rotating while the mandrel is rotated by a drive.
  • the bending device has an elongated, cylindrical mandrel 1, in the surface of which a helical groove 2 is incorporated.
  • the pipe 3 to be bent in a helical shape is pressed into this groove 2 by means of two rollers 4 and 5.
  • the outermost end of the tube 3 is held on the mandrel by a screwed-on clamping piece 6.
  • the mandrel which is located during the bending process between two supports 7, of which only one is shown for simplicity, is rotated in the direction of arrow 9 by a motor 8.
  • the axes 4a and 5a of the two rollers 4 and 5 start from a connecting rail 10 which is rigidly connected to a feed sleeve 12 via a rod 11.
  • the feed sleeve 12 surrounds the mandrel 1 at a short distance.
  • the recesses 16 on the inside of the feed sleeve 12 there are a plurality of sliding balls 13, the diameter of which is selected so that they can run in the spiral groove 2 with little friction.
  • the balls 13 are pressed into the groove 2 by means of clamping screws 14 and springs 15.
  • a stationary support rail 18, along which the connecting rail 10 slides, ensures that the connecting rail 10 can only move parallel to the mandrel 1 in the direction of the arrow 19, with the rigid connection between the connecting rail 10 and the feed sleeve 12 being used for this purpose contributes.
  • the feed sleeve 12 is only able to move in the direction of the arrow 19 when the mandrel 1 is rotated without being rotated itself. It is of course also possible per se, in deviation from the illustration given in FIG. 1, to bring about the non-rotatable movement of the feed sleeve 12 in the arrow direction 19 in a different way.
  • the tube 3 When the mandrel 1 is rotated in the direction of arrow 9, the tube 3 is pressed into the helical groove 2 by the device described and is itself deformed in a helical manner. In order to detach the bent tube from the mandrel 1, it is hollow and can be dismantled. 2 shows how the mandrel 1 consists of four segments 1a, 1b, 1c and 1d, between which there are detachable flat inserts 20, 21, 22 and 23, respectively. The inserts are releasably attached to an adjacent segment by screws 24, only one of which is shown.
  • the mandrel After loosening the screws 24 and pressing the inserts 20 to 23 towards the hollow interior 25 of the mandrel 1, the mandrel disintegrates into several individual parts with a considerably smaller diameter than the original mandrel, these individual parts then being easily removed from the helically bent tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

1. Process for producing a helical tube from a straight tube (3), which is wound helically over a rotated mandrel (1), the mandrel being constructed to be dismountable and having a helical groove (2) on its cylindrical surface into which the tube (3) is pressed in by means of movable rollers (4, 5) when the mandrel (1) is turned, and the helical tube being withdrawn from the dismantled mandrel, reduced in diameter, characterised in that the rollers (4, 5) are connected to a feed sleeve (12) surrounding the mandrel (1), the sleeve (12) remaining resistant to rotation when the mandrel is rotated and being moved axially.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines wendelförmigen Rohres aus einem geraden Rohr, welches wendelförmig über einen gedrehten Dorn gewickelt ist, wobei der Dorn zerlegbar ausgebildet ist und an seiner zylindrischen Oberfläche eine Wendelnut aufweist, in welche das Rohr beim Drehen des Dorns mittels verschiebbarer Rollen eingedrückt wird, und das wendelförmige Rohr vom zerlegten, im Durch- messer reduzierten Dorn abgezogen wird, sowie eine Vorrichtung hierzu.The invention relates to a method for producing a helical tube from a straight tube, which is helically wound over a rotated mandrel, the mandrel being designed to be dismantled and having a helical groove on its cylindrical surface, into which the tube rotates when the mandrel is rotated by means of displaceable rollers is pressed in, and the helical tube is pulled off the disassembled mandrel with reduced diameter, and a device for this.

Eine solches Verfahren und die zugehörige Vorrichtung kennt man aus FR-A-2 532 565, wobei der Dorn auf einem Wagen angeordnet ist und im Einsatz nicht nur gedreht sondern auch in Längsrichtung bewegt wird. Der Erfindung liegt die Aufgabe zugrunde, den Dorn nicht in Längsrichtung zu bewegen und sehr gleichmäßig gewendelte Rohre herzustellen. Beim eingangs genannten Verfahren geschieht dies erfindungsgemäß dadurch, daß die Rollen verschiebbar ausgebildet und mit einer den Dorn umgreifenden Vorschubhülse verbunden sind, wobei die Hülse beim Drehen des Dorns drehfest bleibt und axial verschoben wird.Such a method and the associated device are known from FR-A-2 532 565, the mandrel being arranged on a carriage and not only being rotated in use but also being moved in the longitudinal direction. The invention has for its object not to move the mandrel in the longitudinal direction and to produce very evenly coiled tubes. In the method mentioned at the outset, this is done according to the invention in that the rollers are designed to be displaceable and are connected to a feed sleeve encompassing the mandrel, the sleeve remaining rotationally fixed when the mandrel is rotated and being axially displaced.

Beim erfindungsgemäßen Verfahren werden die Vorschubhülse und die Rollen beim Biegevorgang parallel zur ortsfesten Achse des Dorns verschoben, dabei wird das Rohr in die Wendelnut des Dorns gedrückt, wodurch ein gleichmäßig gewendeltes Rohr erzeugt wird. Dieses Verfahren ermöglicht es auch, auf ein Erhitzen oder Erwärmen des geraden Rohres zum Erleichtern des Biegens zu verzichten. Zum Eindrücken des Rohres in die Wendelnut kann eine Rolle ausreichen, üblicherweise werden jedoch mehrere Rollen verwendet. Die Rollen sind zweckmäßigerweise an einer Verbindungsschiene drehbar befestigt, und die Verbindungsschiene ist mit der Vorschubhülse starr verbunden. Vorzugsweise weist die Vorschubhülse an ihrer Innenseite Gleitkugeln auf, die in der Wendelnut des Dorns laufen. Diese Gleitkugeln verringern die Reibung, wenn sich die Vorschubhülse dem Dorn entlang, ohne zu drehen, bewegt, während der Dorn durch einen Antrieb gedreht wird.In the method according to the invention, the feed sleeve and the rollers are displaced parallel to the fixed axis of the mandrel during the bending process, the tube being pressed into the helical groove of the mandrel, thereby producing a uniformly coiled tube. This method also makes it possible to dispense with heating or heating the straight tube to facilitate bending. One roller may be sufficient to press the tube into the helical groove, but usually several rollers are used. The rollers are expediently rotatably attached to a connecting rail, and the connecting rail is rigidly connected to the feed sleeve. The feed sleeve preferably has sliding balls on its inside, which run in the spiral groove of the mandrel. These sliding balls reduce the friction when the feed sleeve moves along the mandrel without rotating while the mandrel is rotated by a drive.

Ein Ausführungsbeispiel wird mit Hilfe der Zeichnung erläutert. Es zeigt :

  • Fig. 1 eine Teilansicht der Biegevorrichtung und
  • Fig. 2 einen Schnitt durch die Vorschubhülse und den Dorn nach der Linie 11-11 in Fig. 1 in vergrösserter Darstellung.
An embodiment is explained with the help of the drawing. It shows :
  • Fig. 1 is a partial view of the bending device and
  • Fig. 2 shows a section through the feed sleeve and the mandrel along the line 11-11 in Fig. 1 in an enlarged view.

Die Biegevorrichtung weist einen langgestreckten, zylindrischen Dorn 1 auf, in dessen Oberfläche eine Wendelnut 2 eingearbeitet ist. In diese Nut 2 wird das wendelförmig zu biegende Rohr 3 mittels zweier Rollen 4 und 5 eingedrückt. Dabei wird das äußerste Ende des Rohres 3 durch ein aufgeschraubtes Klemmstück 6 auf dem Dorn festgehalten.The bending device has an elongated, cylindrical mandrel 1, in the surface of which a helical groove 2 is incorporated. The pipe 3 to be bent in a helical shape is pressed into this groove 2 by means of two rollers 4 and 5. The outermost end of the tube 3 is held on the mandrel by a screwed-on clamping piece 6.

Der Dorn, der sich während des Biegevorgangs zwischen zwei Stützen 7, von denen zur Vereinfachung nur eine dargestellt ist, befindet, wird durch einen Motor 8 in Richtung des Pfeils 9 gedreht.The mandrel, which is located during the bending process between two supports 7, of which only one is shown for simplicity, is rotated in the direction of arrow 9 by a motor 8.

Die Achsen 4a und 5a der beiden Rollen 4 und 5 gehen von einer Verbindungsschiene 10 aus, die über eine Stange 11 mit einer Vorschubhülse 12 starr verbunden ist. Wie auch aus Fig. 2 zu ersehen ist, umgibt die Vorschubhülse 12 den Dorn 1 in einem geringen Abstand. In Vertiefungen 16 der Innenseits der Vorschubhülse 12 sitzen mehrere Gleitkugeln 13, deren Durchmesser so gewählt ist, daß sie mit geringer Reibung in der Wendelnut 2 laufen können. Wie aus Fig. 2 ersichtlich ist, werden die Kugeln 13 durch Spannschrauben 14 und Federn 15 in die Nut 2 gedrückt.The axes 4a and 5a of the two rollers 4 and 5 start from a connecting rail 10 which is rigidly connected to a feed sleeve 12 via a rod 11. As can also be seen from FIG. 2, the feed sleeve 12 surrounds the mandrel 1 at a short distance. In the recesses 16 on the inside of the feed sleeve 12 there are a plurality of sliding balls 13, the diameter of which is selected so that they can run in the spiral groove 2 with little friction. As can be seen from FIG. 2, the balls 13 are pressed into the groove 2 by means of clamping screws 14 and springs 15.

Durch eine ortsfeste Stützschiene 18, an der die Verbindungsschiene 10 entlang gleitet, ist dafür gesorgt, daß sich die Verbindungsschiene 10 nur parallel zum Dorn 1 in Richtung des Pfeils 19 bewegen kann, wobei hierzu auch die starre Verbindung zwischen der Verbindungsschiene 10 und der Vorschubhülse 12 beiträgt. Durch diese starre Kopplung ist auch die Vorschubhülse 12 nur in der Lage, sich beim Drehen des Dorns 1 in der Richtung des Pfeils 19 zu bewegen, ohne dabei selbst gedreht zu werden. Es ist natürlich an sich auch möglich, abweichend von der in Fig. 1 gegebenen Darstellung die drehfeste Bewegung der Vorschubhülse 12 in Pfeilrichtung 19 auf andere Weise herbeizuführen.A stationary support rail 18, along which the connecting rail 10 slides, ensures that the connecting rail 10 can only move parallel to the mandrel 1 in the direction of the arrow 19, with the rigid connection between the connecting rail 10 and the feed sleeve 12 being used for this purpose contributes. As a result of this rigid coupling, the feed sleeve 12 is only able to move in the direction of the arrow 19 when the mandrel 1 is rotated without being rotated itself. It is of course also possible per se, in deviation from the illustration given in FIG. 1, to bring about the non-rotatable movement of the feed sleeve 12 in the arrow direction 19 in a different way.

Beim Drehen des Dorns 1 in Richtung des Pfeils 9 wird durch die beschriebene Vorrichtung das Rohr 3 in die Wendelnut 2 eingedrückt und dabei selbst wendelförmig verformt. Um das fertiggebogene Rohr vom Dorn 1 zu lösen, ist dieser hohl und zerlegbar ausgebildet. In Fig. 2 ist zu sehen, wie der Dorn 1 aus vier Segmenten 1a, 1 b, 1c und 1d besteht, zwischen denen sich jeweils lösbare flache Einsatzstücke 20, 21, 22 und 23 befinden. Die Einsatzstücke sind durch Schrauben 24, von denen nur eine dargestellt ist, lösbar an einem benachbarten Segment befestigt. Nach Lösen der Schrauben 24 und Eindrücken der Einsatzstücke 20 bis 23 zum hohlen Innenraum 25 des Dorns 1 hin, zerfällt der Dorn in mehrere Einzelteile mit erheblich geringerem Durchmesser als der ursprüngliche Dorn, wobei diese Einzelteile dann leicht vom wendelförmig gebogenen Rohr entfernt werden können.When the mandrel 1 is rotated in the direction of arrow 9, the tube 3 is pressed into the helical groove 2 by the device described and is itself deformed in a helical manner. In order to detach the bent tube from the mandrel 1, it is hollow and can be dismantled. 2 shows how the mandrel 1 consists of four segments 1a, 1b, 1c and 1d, between which there are detachable flat inserts 20, 21, 22 and 23, respectively. The inserts are releasably attached to an adjacent segment by screws 24, only one of which is shown. After loosening the screws 24 and pressing the inserts 20 to 23 towards the hollow interior 25 of the mandrel 1, the mandrel disintegrates into several individual parts with a considerably smaller diameter than the original mandrel, these individual parts then being easily removed from the helically bent tube.

Claims (6)

1. Process for producing a helical tube from a straight tube (3), which is wound helically over a rotated mandrel (1), -the mandrel being constructed to be dismountable and having a helical groove (2) on its cylindrical surface into which the tube (3) is pressed in by means of movable rollers (4, 5) when the mandrel (1) is turned, and the helical tube being withdrawn from the dismantled mandrel, reduced in diameter, characterised in that the rollers (4, 5) are connected to a feed sleeve (12) surrounding the mandrel (1), the sleeve (12) remaining resistant to rotation when the mandrel is rotated and being moved axially.
2. Process according to Claim 1, characterised in that the tube (3) is pressed into the helical groove (2) at ambient temperature.
3. Apparatus for producing a helical tube from a straight tube (3), with a rotatable, dismountable mandrel (1) which is provided on its cylindrical surface with a helical groove (2), and with movable rollers (4, 5) for pressing the tube into the helical groove, characterised in that the rollers (4, 5) are connected to a feed sleeve (12) surrounding the mandrel (1) positioned so as to be resistant to rotation and movable axially.
4. Apparatus according to Claim 3, characterised in that the rollers (4, 5) for pressing in the tube (3) are attached to a connecting rail (10) so as to be rotatable and the connecting rail is connected fixedly to the feed sleeve (12).
5. Apparatus according to Claim 3 or 4, characterised in that the feed sleeve (12) has slide bearings (13) on the inside which run in the helical groove (2).
6. Apparatus according to Claim 4, characterised in that the connecting rail (10) is guided along a fixed support rail (18).
EP85201601A 1984-10-19 1985-10-03 Method and device for manufacturing helical tubes Expired EP0178721B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85201601T ATE35096T1 (en) 1984-10-19 1985-10-03 METHOD AND APPARATUS FOR MANUFACTURING HELICATED PIPES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843438398 DE3438398A1 (en) 1984-10-19 1984-10-19 METHOD AND DEVICE FOR MANUFACTURING COILED TUBES
DE3438398 1984-10-19

Publications (2)

Publication Number Publication Date
EP0178721A1 EP0178721A1 (en) 1986-04-23
EP0178721B1 true EP0178721B1 (en) 1988-06-15

Family

ID=6248342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201601A Expired EP0178721B1 (en) 1984-10-19 1985-10-03 Method and device for manufacturing helical tubes

Country Status (3)

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EP (1) EP0178721B1 (en)
AT (1) ATE35096T1 (en)
DE (2) DE3438398A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3912244A1 (en) * 1989-04-14 1990-10-18 Pulzer Biegetechnik Gmbh Device for bending cylindrical materials into spiral shape - by feeding material to rotating former by grooved roller which moves along axis of former
DE102012101523B4 (en) * 2012-02-24 2015-06-25 TEKTON BENDING GmbH & Co. KG Apparatus and method for producing coiled tubing
CN105478552B (en) * 2015-12-17 2017-09-05 金华职业技术学院 A kind of processing method of tube bending shaping
CN105382065B (en) * 2015-12-17 2017-09-26 金华职业技术学院 A kind of tube bending jig
CN115780599B (en) * 2022-12-14 2023-12-22 江苏银家不锈钢管业有限公司 Pipe bender for stainless steel pipe processing

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE435025B (en) * 1976-05-06 1984-09-03 Arenco Parts Ab DEVICE FOR BENDING ROWS FOR RISES
DE2747844C3 (en) * 1977-10-26 1980-06-04 Schmidt + Clemens Gmbh + Co, 5253 Lindlar Device for producing a coiled tubing
DE2749589A1 (en) * 1977-11-05 1979-05-10 Schwarze Rigobert COLD BENDING PROCESS AND DEVICE FOR THE MANUFACTURE OF CURVED CASED PIPELINES
SE7811607L (en) * 1978-11-10 1980-05-11 Arenco Parts Ab CHARGING DEVICE FOR LOADING TUBES OR PROFILES IN A TUBE OR PROFILE BENDING MACHINE EQUIPPED TO WORK WITH INTERNAL CONTROL
DE3000170C2 (en) * 1980-01-04 1984-09-06 W. Eckold AG, Trimmis A mandrel for a pipe to be bent
FR2532565B1 (en) * 1982-09-03 1987-01-09 Framatome Sa METHOD AND APPARATUS FOR SOAKING TUBES OF A TUBULAR BEAM OF A STEAM GENERATOR

Also Published As

Publication number Publication date
DE3438398A1 (en) 1986-04-30
DE3563313D1 (en) 1988-07-21
ATE35096T1 (en) 1988-07-15
EP0178721A1 (en) 1986-04-23

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