EP1230995B1 - Procedure and device for the fabrication of tubes with longitudinally welded seam - Google Patents
Procedure and device for the fabrication of tubes with longitudinally welded seam Download PDFInfo
- Publication number
- EP1230995B1 EP1230995B1 EP02290051A EP02290051A EP1230995B1 EP 1230995 B1 EP1230995 B1 EP 1230995B1 EP 02290051 A EP02290051 A EP 02290051A EP 02290051 A EP02290051 A EP 02290051A EP 1230995 B1 EP1230995 B1 EP 1230995B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- draw
- dies
- metal strip
- strip
- slotted pipe
- 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
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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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0818—Manufacture of tubes by drawing of strip material through dies
Definitions
- the invention relates to a method and an apparatus for the production longitudinally welded pipes according to the preamble of claim 1 and of Claim 5.
- a jaw trigger which firmly surrounds the slot tube. Behind the Jaw trigger enters the slotted tube in a guide device, which is the tube exactly before and after the welding point.
- a recess in the Guide means releases the band edges in a short area, so that a Laser beam can weld the band edges.
- This method is particularly suitable for the production of tubes made of stainless Steel with dimensions of approx. 3 - 3.5 mm and a wall thickness of 0.2 mm.
- JP-A-55 022 442 is a method for producing a longitudinally welded Metal tube known from a continuously fed metal strip, in which the metal band in a drawing ring with a decreasing in the direction of production Hole is formed into a slotted tube. In a second arranged behind it Draw ring with a hole with the same diameter are the Band edges held together and behind the second drawing ring with each other welded.
- Forming a metal strip into a slit tube having an outer diameter of less than 6 mm is limited to a wall thickness of at least 0.15 mm. at smaller wall thicknesses can be an exact alignment of the band edges to each other do not realize. However, an exact juxtaposition of the band edges is included such extremely small wall thicknesses to achieve a good weld essential. This is especially true when the welding of the strip edges with a laser welding device is made.
- the present invention is therefore the object of the above described method to improve that pipes with a Outer diameter of less than 6 mm from a metal strip with a wall thickness of less than 0.15, in particular less than 0.10 mm can be produced.
- FIG. 1 the flow of the process is shown simplified. From one Supply reel 1 becomes a metal strip 2 with a wall thickness of less than 0.15 mm withdrawn and gradually formed in a tube forming device 3 to the slotted tube, and the longitudinal edges of the slot tube with a laser welding device 4 welded.
- the welded tube 5 is taken from a collet chuck 6 and a Supply drum 7 fed.
- FIG. 2 shows a lateral section through the tube forming device 3.
- the metal strip 2 is by means of a conventional roller tool, not shown initially provided only at the band edges with a curvature whose radius the Radius of the finished tube almost corresponds.
- the pre-formed metal strip is then arranged through several successively Drawing dies 8, 9, 10 and 11, which have a conical opening, gradually become one Pipe deformed with an open slot.
- the dies 8, 9, 10 and 11 made of diamond.
- the opening angle of the dies 8, 9, 10 and 11 is about 4 °.
- housing 13 In a arranged behind the pipe guide 12 housing 13 is a so-called Sword 14 is provided, which through the longitudinal slot of the tube into the tube interior protrudes and contacted the longitudinal edges of the tube. This results in an exact Guiding the strip edges, so that no difficulties in welding occur. Behind the housing 13, a last die 15 is provided, the conical extending opening at its narrowest point, d. H. at the exit point the band edges merges so that they by means of the laser welding device 16 with each other can be welded. Also, this die 15 is made of diamond.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Coating With Molten Metal (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung
längsnahtgeschweißter Rohre nach dem Oberbegriff des Anspruchs 1 bzw. des
Anspruchs 5.The invention relates to a method and an apparatus for the production
longitudinally welded pipes according to the preamble of claim 1 and of
Aus der US 3 023 300 A ist ein Verfahren zur Herstellung längsnahtgeschweißter Metallrohre bekannt, bei dem ein von einer Vorratsspule abgezogenes Metallband durch eine aus mehreren hintereinander angeordneten formrollenpaaren bestehende Formeinrichtung in kontinuierlicher Arbeitsweise zu einem Schlitzrohr geformt wird, die Bandkanten des Schlitzrohres miteinander verschweißt werden, das geschweißte Metallrohr mit einer schraubenlinien- oder ringförmigen Wellung versehen wird, und das gewellte Rohr auf eine Vorratstrommel aufgewickelt wird.From US Pat. No. 3,023,300 A, a method for producing longitudinally welded seams is disclosed Metal pipes known in which a deducted from a supply spool metal strip one consisting of several successively arranged form roller pairs Forming device is formed in continuous operation to a slotted tube, the Band edges of the slot tube are welded together, the welded Metal tube is provided with a helical or annular corrugation, and the corrugated tube is wound on a storage drum.
Mit einem solchen Verfahren, welches insbesondere für die Ummantelung der Seelen von elektrischen Kabeln geeignet ist, lassen sich Metallrohre in großen Längen herstellen.With such a procedure, which in particular for the sheathing of souls suitable for electrical cables, can be metal pipes in long lengths produce.
Aus der DE 44 34 134 A1 ist ein ähnliches Verfahren bekannt, mit welchem sich Metallrohre mit einem Außendurchmesser zwischen 1 und 6 mm herstellen lassen. Auch bei diesem Verfahren wird ein kontinuierlich von einem Vorrat abgezogenes Metallband zu einem Schlitzrohr geformt und die Bandkanten miteinander verschweißt. Die Formvorrichtung besteht ebenfalls aus mehreren formrollensätzen. From DE 44 34 134 A1 a similar method is known with which Metal tubes can be produced with an outer diameter between 1 and 6 mm. Also in this process, a continuously withdrawn from a supply Metal strip formed into a slotted tube and the strip edges welded together. The molding device also consists of several roll-forming sets.
Für die exakte Führung des geschlitzten Rohres unterhalb der Schweißeinrichtung sorgt ein Spannbackenabzug, der das Schlitzrohr fest umgreift. Hinter dem Spannbackenabzug läuft das Schlitzrohr in eine Führungseinrichtung ein, die das Rohr vor und hinter dem Schweißpunkt exakt führt. Eine Ausnehmung in der Führungseinrichtung gibt die Bandkanten in einem kurzen Bereich frei, so daß ein Laserstrahl die Bandkanten verschweißen kann.Ensures the exact guidance of the slotted tube below the welding device a jaw trigger, which firmly surrounds the slot tube. Behind the Jaw trigger enters the slotted tube in a guide device, which is the tube exactly before and after the welding point. A recess in the Guide means releases the band edges in a short area, so that a Laser beam can weld the band edges.
Dieses Verfahren ist besonders geeignet zur Herstellung von Röhrchen aus rostfreiem Stahl mit Abmessungen von ca. 3 - 3,5 mm und einer Wanddicke von 0,2 mm.This method is particularly suitable for the production of tubes made of stainless Steel with dimensions of approx. 3 - 3.5 mm and a wall thickness of 0.2 mm.
Aus der JP-A-55 022 442 ist ein Verfahren zur Herstellung eines längsnahtgeschweißten Metallrohres aus einem kontinuierlich zugeführten Metallband bekannt, bei welchem das Metallband in einem Ziehring mit einer sich in Fertigungsrichtung verringernden Bohrung zu einem Schlitzrohr geformt wird. In einem dahinter angeordneten zweiten Ziehring mit einer Bohrung mit durchgehend gleichem Durchmesser werden die Bandkanten zusammengehalten und hinter dem zweiten Ziehring miteinander verschweißt.From JP-A-55 022 442 is a method for producing a longitudinally welded Metal tube known from a continuously fed metal strip, in which the metal band in a drawing ring with a decreasing in the direction of production Hole is formed into a slotted tube. In a second arranged behind it Draw ring with a hole with the same diameter are the Band edges held together and behind the second drawing ring with each other welded.
Aus der JP-A-11 221 621 ist ein Verfahren zur kontinuierlichen Herstellung von Metallrohren aus einem Metallband bekannt, bei welchem das Metallband durch mehrere im Abstand zueinander angeordnete Formrollenpaare zu einem Schlitzrohr geformt und anschließend der Längsschlitz verschweißt wird.From JP-A-11 221 621 a method for the continuous production of Metal pipes known from a metal strip, in which the metal strip through a plurality of spaced apart pairs of forming rollers to a slotted tube shaped and then the longitudinal slot is welded.
Das Formen eines Metallbandes zu einem Schlitzrohr mit einem Außendurchmesser von weniger als 6 mm ist begrenzt auf eine Wanddicke von mindestens 0,15 mm. Bei geringeren Wanddicken läßt sich eine exakte Ausrichtung der Bandkanten zueinander nicht verwirklichen. Ein genaues Aneinanderliegen der Bandkanten ist jedoch bei solchen extrem geringen Wanddicken zur Erzielung einer guten Schweißnaht unerläßlich. Dies gilt insbesondere dann, wenn die Verschweißung der Bandkanten mit einer Laserschweißeinrichtung vorgenommen wird.Forming a metal strip into a slit tube having an outer diameter of less than 6 mm is limited to a wall thickness of at least 0.15 mm. at smaller wall thicknesses can be an exact alignment of the band edges to each other do not realize. However, an exact juxtaposition of the band edges is included such extremely small wall thicknesses to achieve a good weld essential. This is especially true when the welding of the strip edges with a laser welding device is made.
Der vorliegenden Erfindung liegt von daher die Aufgabe zugrunde, das eingangs beschriebene Verfahren dahingehend zu verbessern, daß auch Rohre mit einem Außendurchmesser von weniger als 6 mm aus einem Metallband mit einer Wanddicke von weniger als 0,15 insbesondere weniger als 0,10 mm herstellbar sind.The present invention is therefore the object of the above described method to improve that pipes with a Outer diameter of less than 6 mm from a metal strip with a wall thickness of less than 0.15, in particular less than 0.10 mm can be produced.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 bzw. Anspruchs 5 gelöst.This object is achieved by the features of claim 1 or claim 5 solved.
Durch die erfindungsgemäßen Merkmale ist es in überraschend einfacher Weise gelungen, ein Metallrohr mit einer derartig geringen Wanddicke ohne nachfolgende Ziehprozesse fehlerfrei herzustellen.By the features according to the invention, it is in a surprisingly simple manner succeeded, a metal tube with such a small wall thickness without subsequent To make drawing processes error-free.
Es wird vermutet, daß durch die vergrößerte Reibung zwischen den Ziehsteinen und dem gerundeten Metallband ein "Wandern" des gerundeten Metallbandes bzw. des Schlitzrohres ausgeschlossen wird. Insbesondere bei Verwendung von Ziehsteinen aus Diamantwerkstoff ist ein Verschleiß der Ziehsteine nicht zu erwarten, so daß große Längen des Metallrohres ohne Unterbrechung des Fertigungsprozesses herstellbar sind.It is believed that due to the increased friction between the dies and the rounded metal band a "hiking" of the rounded metal band or the Slot tube is excluded. Especially when using dies Diamond material is not expected to wear the dies, so that large Lengths of the metal tube without interruption of the manufacturing process can be produced.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen erfaßt.Further advantageous embodiments of the invention are covered in the subclaims.
Die Erfindung ist anhand der in den Figuren 1 und 2 schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention is based on the schematically shown in Figures 1 and 2 Embodiments explained in more detail.
In der Figur 1 ist der Ablauf des Verfahrens vereinfacht dargestellt. Von einer
Vorratsspule 1 wird ein Metallband 2 mit einer Wanddicke von weniger als 0,15 mm
abgezogen und in einer Rohrformeinrichtung 3 allmählich zum Schlitzrohr geformt, und
die Längskanten des Schlitzrohres mit einer Laserschweißeinrichtung 4 verschweißt. Das
geschweißte Rohr 5 wird von einem Spannzangenabzug 6 gefaßt und einer
Vorratstrommel 7 zugeführt.In the figure 1, the flow of the process is shown simplified. From one
Supply reel 1 becomes a
Das geschweißte Rohr 5 hat beispielsweise folgende Abmessungen
Um ein Rohr mit diesen Abmessungen herstellen zu können, sind äußerst hohe Anforderungen an den Rohrformprozeß zu stellen.In order to produce a tube with these dimensions are extremely high Requirements for the tube forming process.
Figur 2 zeigt einen seitlichen Schnitt durch die Rohrformeinrichtung 3.FIG. 2 shows a lateral section through the
Das Metallband 2 wird mittels eines nicht dargestellten herkömmlichen Rollenwerkzeugs
zunächst nur an den Bandkanten mit einer Krümmung versehen, deren Radius dem
Radius des fertigen Rohres nahezu entspricht.The
Das vorverformte Metallband wird dann durch mehrere hintereinander angeordnete
Ziehsteine 8, 9, 10 und 11, die eine konische Öffnung aufweisen, allmählich zu einem
Rohr mit einem offenen Schlitz verformt. Mit besonderem Vorteil bestehen die Ziehsteine
8, 9, 10 und 11 aus Diamant. Der Öffnungswinkel der Ziehsteine 8, 9, 10 und 11
beträgt in etwa 4°.The pre-formed metal strip is then arranged through several successively
Drawing dies 8, 9, 10 and 11, which have a conical opening, gradually become one
Pipe deformed with an open slot. With particular advantage, the
Hinter dem letzten Ziehstein 11 ist eine Rohrführung 12 mit einer zylindrischen Bohrung
angeordnet.Behind the
In einem hinter der Rohrführung 12 angeordneten Gehäuse 13 ist ein sogenanntes
Schwert 14 vorgesehen, welches durch den Längsschlitz des Rohres in das Rohrinnere
hineinragt und die Längskanten des Rohres kontaktiert. Hierdurch ergibt sich eine exakte
Führung der Bandkanten, so daß keine Schwierigkeiten beim Schweißen auftreten.
Hinter dem Gehäuse 13 ist ein letzter Ziehstein 15 vorgesehen, dessen konisch
verlaufende Öffnung an ihrer engsten Stelle, d. h. an der Austrittsstelle die Bandkanten
zusammenführt, so daß diese mittels der Laserschweißeinrichtung 16 miteinander
verschweißt werden können. Auch dieser Ziehstein 15 ist aus Diamant hergestellt.In a arranged behind the
Claims (11)
- Method to manufacture longitudinally welded pipes in which a metal strip continuously drawn from a supply is gradually shaped into a slotted pipe, and the longitudinal slots of the slotted pipe is welded, characterized in that metal strip (2) is drawn through a first shaping step consisting of a plurality of draw dies (8, 9, 10, 11) closely following each other whose diameter narrows in the direction of manufacture, that metal strip (2) is increasingly rounded in each of the draw dies (8, 9, 10, 11) in a peripheral direction, that the slotted pipe is closed directly before the welding point in a last shaping step (15) consisting of a draw die with a diameter narrowing in the direction of manufacture, and that before the last draw die (15), the strip edges are guided through a sword (14) extending into the slotted pipe so that the strip edges lie precisely in the welding point.
- Method according to claim 1, characterized in that metal strip (2) is drawn through draw dies (8, 9, 10, 11, 15) consisting of hard metal, ceramic or diamond.
- Method according to claim 1 or 2, characterized in that the edges of metal strip (2) are shaped before entering the first draw die (8) so that the curvature radius of the shaped strip edges approximately corresponds to the curvature radius of the finished pipe (5).
- Method according to one of claims 1 to 3, characterized in that a laser (16) is used for welding.
- Device to manufacture longitudinally welded metal pipes consisting of a shaping device for forming a metal strip into a slotted pipe at several steps, and a welding device closing the longitudinal slot of the slotted pipe, characterized in that shaping device (3) has a first shaping step consisting of several closely following draw dies (8, 9, 10, 11) that is suitable for increasingly rounding the metal strip (2) into the slotted pipe, wherein the draw dies have a conical opening, and a second shaping step consisting of a draw die (15) with a conical opening in which the slotted pipe is closed directly before the welding device (16) during use, and that a sword (14) guiding the strip edges and extending into the slotted pipe is provided between the first and second shaping step before the last draw die (15).
- Device according to claim 5, characterized in that the draw dies (8, 9, 10, 11, 15) consist of hard metal.
- Device according to claim 5, characterized in that the draw dies (8, 9, 10, 11, 15) consist of ceramic.
- Device according to claim 5, characterized in that the draw dies (8, 9, 10, 11, 15) consist of diamond.
- Device according to one of claims 5 to 8, characterized in that a roller tool is disposed before the first draw die (8) that when used only contacts the strip edges and preshapes them so that the curvature of the strip edges equals the curvature of the finished welded pipe.
- Device according to one of claims 5 to 9, characterized in that a laser welding device (16) follows the last draw die (15).
- Device according to one of claims 5 to 10, characterized in that the inlet of each subsequent draw die of the first group is larger than the outlet of the preceding draw die.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10106195A DE10106195A1 (en) | 2001-02-10 | 2001-02-10 | Process for the production of longitudinally welded pipes |
| DE10106195 | 2001-02-10 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1230995A2 EP1230995A2 (en) | 2002-08-14 |
| EP1230995A3 EP1230995A3 (en) | 2003-11-05 |
| EP1230995B1 true EP1230995B1 (en) | 2004-10-20 |
Family
ID=7673588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02290051A Expired - Lifetime EP1230995B1 (en) | 2001-02-10 | 2002-01-10 | Procedure and device for the fabrication of tubes with longitudinally welded seam |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1230995B1 (en) |
| JP (1) | JP2002301515A (en) |
| CN (1) | CN1243618C (en) |
| AT (1) | ATE280004T1 (en) |
| DE (2) | DE10106195A1 (en) |
| DK (1) | DK1230995T3 (en) |
| ES (1) | ES2229057T3 (en) |
| PT (1) | PT1230995E (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1595610B1 (en) * | 2004-05-07 | 2012-02-29 | Nexans | Method for the continuous production of longitudinally seam welded metal tubes |
| CN102189149B (en) * | 2010-03-08 | 2012-11-14 | 湖北三环锻压设备有限公司 | Technological method for forming high-strength thick wall steel tube |
| CN108688188A (en) * | 2017-04-06 | 2018-10-23 | 上海岚青包装设备有限公司 | A kind of full-automatic medical bed pipe heat-sealing machine |
| CN112742893A (en) * | 2020-12-08 | 2021-05-04 | 上海坤勇节能科技有限公司 | Taper hole extrusion type straight welded pipe forming device and forming method thereof |
| CN113319149B (en) * | 2021-08-03 | 2021-11-02 | 天津市大千管业有限公司 | Integrated forming equipment and method for producing annular metal corrugated pipe |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE942390C (en) * | 1953-04-21 | 1956-05-03 | Mannesmann Ag | Device for the continuous removal of the inner burr from pipes welded from steel strips |
| US3001569A (en) * | 1958-04-29 | 1961-09-26 | Flexonics Corp | Tube forming tool |
| US3023300A (en) * | 1959-08-10 | 1962-02-27 | Hackethal Draht & Kabelwerk Ag | Method and apparatus for forming cable sheath |
| DE2805735C3 (en) * | 1978-02-09 | 1982-02-18 | Mannesmann AG, 4000 Düsseldorf | Method and device for the production of longitudinally welded pipes by cold forming of strips |
| JPS5522442A (en) * | 1978-08-03 | 1980-02-18 | Yoshida Kogyo Kk <Ykk> | Circular pipe forming method and device thereof |
| DE3044003C2 (en) * | 1980-11-18 | 1983-07-14 | Mannesmann AG, 4000 Düsseldorf | Device for introducing thin tape to the open-ended tube by pulling it |
| FR2580526A1 (en) * | 1985-04-17 | 1986-10-24 | Shahum Christian | DIE DEVICE FOR ROLLING BY FLAT IRON STRETCHING AND OBTAINING A TUBULAR ELEMENT |
| DE9007411U1 (en) * | 1990-01-10 | 1991-06-27 | KM-kabelmetal AG, 4500 Osnabrück | Device for producing a longitudinally welded metal pipe |
| DE4434134A1 (en) * | 1994-09-24 | 1996-03-28 | Kabelmetal Electro Gmbh | Process for producing a longitudinally welded metal tube |
| JPH08267127A (en) * | 1995-03-28 | 1996-10-15 | Nisshin Steel Co Ltd | Production of metallic welded pipe |
| JP3904707B2 (en) * | 1998-02-06 | 2007-04-11 | カルソニックカンセイ株式会社 | Pipe making method |
-
2001
- 2001-02-10 DE DE10106195A patent/DE10106195A1/en not_active Withdrawn
- 2001-12-05 CN CNB011429550A patent/CN1243618C/en not_active Expired - Fee Related
-
2002
- 2002-01-10 DE DE50201327T patent/DE50201327D1/en not_active Expired - Lifetime
- 2002-01-10 PT PT02290051T patent/PT1230995E/en unknown
- 2002-01-10 EP EP02290051A patent/EP1230995B1/en not_active Expired - Lifetime
- 2002-01-10 ES ES02290051T patent/ES2229057T3/en not_active Expired - Lifetime
- 2002-01-10 AT AT02290051T patent/ATE280004T1/en active
- 2002-01-10 DK DK02290051T patent/DK1230995T3/en active
- 2002-02-08 JP JP2002031943A patent/JP2002301515A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| PT1230995E (en) | 2005-03-31 |
| ATE280004T1 (en) | 2004-11-15 |
| CN1368413A (en) | 2002-09-11 |
| EP1230995A2 (en) | 2002-08-14 |
| DE10106195A1 (en) | 2002-08-14 |
| DK1230995T3 (en) | 2005-02-07 |
| DE50201327D1 (en) | 2004-11-25 |
| EP1230995A3 (en) | 2003-11-05 |
| JP2002301515A (en) | 2002-10-15 |
| CN1243618C (en) | 2006-03-01 |
| ES2229057T3 (en) | 2005-04-16 |
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