EP3049199B1 - Method for producing a connection element, and connection element - Google Patents

Method for producing a connection element, and connection element Download PDF

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Publication number
EP3049199B1
EP3049199B1 EP14765918.9A EP14765918A EP3049199B1 EP 3049199 B1 EP3049199 B1 EP 3049199B1 EP 14765918 A EP14765918 A EP 14765918A EP 3049199 B1 EP3049199 B1 EP 3049199B1
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EP
European Patent Office
Prior art keywords
flange
casing
blank
connecting element
opposite
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EP14765918.9A
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German (de)
French (fr)
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EP3049199A1 (en
Inventor
Michael Gövert
Stephan Drewes
Adrian Paton
Konstantinos Savvas
Mark Hirt
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • E04H12/08—Structures made of specified materials of metal
    • E04H12/085—Details of flanges for tubular masts
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • E04H12/08—Structures made of specified materials of metal
    • E04H12/10—Truss-like structures

Definitions

  • the invention relates to a method for producing a connecting element or node element, in particular for steel structures of towers, preferably for wind turbines, as well as a connection or node element.
  • poles and towers in particular on wind turbines or tension poles are regularly connected struts at different heights and angles to substantially upright pole structures such as corner stems.
  • Object of the present invention is to provide components, in particular connection or node elements, which avoid the disadvantages listed above.
  • the above-indicated object is achieved by a method for producing a connecting element, in particular for steel structures of Towers, preferably for wind turbines having the features of claim 1.
  • a flange and a flange integrally connected to the flange is produced. Subsequently, the flange of the opposite end of the shell is adapted to the contour of the component with which the jacket is to be connected.
  • a blank a blank, a pipe section or a forging blank is preferably used.
  • spinning rollers is understood to mean a production method of the forming technique which is used for producing mostly rotationally symmetrical hollow bodies.
  • Ronde tensioned in front of the end face of a spinning chuck.
  • the spinning chuck represents the tool that shapes the geometry of the component as an inner mold.
  • the chuck is then set in rotation together with the blank by the main spindle drive of the spinning machine.
  • the actual forming of the blank to the component takes place in several stages by a spinning tool, which is moved, for example, step by step from the center of the blank to the edge and back again. As this movement progresses in the axial direction, the blank gradually approaches the geometry of the chuck.
  • a spinning roller is often used as a tool and the movement is computer-controlled.
  • connection or node elements are provided which can be easily connected to adjacent components, have a force flow which is improved compared to the prior art and can be produced inexpensively.
  • connection of the connecting element in the desired position and position can be made possible by the opposite end of the flange is respectively adapted.
  • different sizes and lengths are possible at Corresponding trimming also allow a strong angled positioning.
  • a further advantage of the invention is that the connecting elements produced according to the invention have no weld seam, such as components produced by bending, so that the notch effect is reduced.
  • the advantages of the present invention are accordingly the reduction of the number of parts, the missing weld in the flange area and the improved power flow.
  • the material thickness of the flange is increased by pushing during the flow-forming against the material thickness of the blank.
  • the transition between the flange and the jacket is formed with a flowing wall thickness. Due to the individual adjustability of the wall thickness in the different areas of the connecting element special advantages are achieved. In particular, the compressive residual stresses introduced into the structure by the flow-forming process can be set, thus significantly improving fatigue strength.
  • the flange is formed on the inside, in which case it is preferable to use a blank as the blank.
  • the material thickness on the flange can be adjusted by stretching or pushing material from adjacent regions, in particular from regions which are allocated in the later trimming. As a result, the stability of the inner flange is increased while reducing the amount of waste.
  • the flange can be formed outboard.
  • a tapered transition region is then formed internally as a jacket, which is welded to one end of a mast construction, in particular a corner handle.
  • the sheath may be conical, with the flange formed at the tapered end of the sheath.
  • a particularly stable construction is achieved by connecting the flared end of the shell with a larger cross section to the mast construction, while the cross section of the flange is adapted to the strut to be attached.
  • the flange of the opposite end of the shell is adjusted by trimming to the outer contour of the component, including in particular a laser or water jet cutting or a plasma or flame cutting is applied.
  • the open end of the preferably conical jacket can be welded after the trimming to the outer contour of the mast construction, in particular the corner post.
  • the flange of the opposite end of the shell with a further flange.
  • the connecting element on both sides of the shell on a flange, wherein the first flange for connection to a strut and the further flange is provided for connection to a mast construction or with a corner post.
  • the further flange is formed by spin forming, whereby the advantages described above are also achieved at this end of the shell.
  • the described method can also be used to produce flange connections for any pipes.
  • This application gives the same advantages in terms of material thickness and stress properties.
  • the use of a pipe section or forging blank, instead of a blank for the flow-forming process for an inner flange also offers itself here.
  • the method is limited in terms of dimensions only by the size of the flow-forming machine. A correspondingly large Machine would also be able to produce the flanges for the tower main pipes, especially for wind turbines.
  • connection or node element 10 according to the invention is shown.
  • the illustrated connecting or node element 10, hereinafter referred to as the connecting element is particularly suitable for steel structures of towers, preferably for wind turbines, and in particular produced by a method according to the invention.
  • the connecting element 10 has a flange 12 and a jacket 14, wherein the jacket 14 integrally adjoins the flange 12 and wherein the flange 12 opposite end of the jacket 14 to the contour of the component of a steel structure, in particular a tubular Eckstiels 30 with round or polygonal cross-section is adapted to which the jacket 14 is to be connected.
  • the jacket 14 has a conical shape which also has a section 16 which is also conical but at a shallower angle.
  • the flange 12 is connected to the tapered end of the conical jacket 14.
  • a cylindrical portion 18 is provided, which connects the flange 12 with the jacket 14 and 16.
  • the flange 12 is formed lying inside and forms an opening 20. With the flange 12 can in a conventional manner Strive to be connected to a steel structure.
  • the flange 12 opposite opening of the shell 14 and the portion 16 is adapted for contact with a cylindrical construction, for example, a tubular Eckstiels 30.
  • the connecting element 10 can be welded to the corner post 30.
  • Fig. 4 is, in which in the Fig. 1 to 3 illustrated embodiment, the axis of the connecting element 10 largely aligned perpendicular to the axis of the Eckstiels 30.
  • Fig. 5 Now shows a further embodiment of an inventive embodiment of the connecting element 10.
  • the jacket 14 has a cylindrical portion 22 which is separated obliquely to the axis of the connecting element 10.
  • the connecting member 10 can be connected at an angle with the corner post 30.
  • Fig. 6 shows a schematic representation of the basic sequence of a method according to the invention for producing a connecting or node element 10, in particular for steel structures of towers, preferably for wind turbines, in which from a blank 40 by means of a flow-forming process a flange 12 and integrally on the flange 12 subsequent coat 14 is produced.
  • the flange 12 opposite end of the jacket 14 is adapted to the contour of the component, such as a corner handle 30, with which the jacket 14 is to be connected. This last step is not shown in the drawing.
  • a blank 40 made of steel is used as the blank.
  • the blank 40 is clamped between a spindle 50 of a flow-forming machine and a spindle 52 which shapes the geometry of the connecting element 10 as an inner mold. With the schematically illustrated pressing tools 54 and 56, the blank 40 is reshaped so that after completion of the flow-forming the desired shape of the connecting element 10 is achieved,
  • the forming step, with the material thickness of the flange 12 is increased by pushing during the flow-spinning against the material thickness of the round blank 40.
  • the starting material of the blank 40 is thinner than the later formed flange 12.
  • material is shifted from the laterally arranged trim 58 and thus produces a greater thickness of the flange 12. This has the particular advantage that less trim 58 is obtained from the middle and the ironed outer jacket 14 can be made of thinner material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wind Motors (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Verbindungselements bzw. Knotenelements, insbesondere für Stahlkonstruktionen von Türmen, vorzugsweise für Windkraftanlagen sowie ein Verbindungs- bzw. Knotenelement.The invention relates to a method for producing a connecting element or node element, in particular for steel structures of towers, preferably for wind turbines, as well as a connection or node element.

An Masten und Türmen, insbesondere an Windkraftanlagen oder Spannungsmasten werden regelmäßig Streben in unterschiedlichen Höhen und Winkeln an im Wesentlichen aufrecht stehenden Maststrukturen wie Eckstielen verbunden.On poles and towers, in particular on wind turbines or tension poles are regularly connected struts at different heights and angles to substantially upright pole structures such as corner stems.

Dazu ist es im Stand der Technik bekannt, Schweißkonstruktionen bestehend aus einzelnen Blechen als Verbindungselemente zu bauen. Insbesondere durch die Schweißnähte entstehen metallurgische Kerben und dadurch eine geringe Dauerfestigkeit. Außerdem sind mit einer solchen Konstruktion viele Einzelteile und somit eine Anhäufung von Schweißnähten im ermüdungsbeanspruchten Bereich sowie ein hoher Montage- und Logistikaufwand verbunden. Aus der EP 2 270 294 A2 ist ein solcher Aufbau grundsätzlich bekannt.For this purpose, it is known in the art to build welded structures consisting of individual sheets as connecting elements. In particular, by the welds arise metallurgical notches and thus a low fatigue strength. In addition, with such a construction many items and thus an accumulation of welds in fatigue-stressed area and a high assembly and logistics costs associated. From the EP 2 270 294 A2 Such a structure is basically known.

Darüber hinaus ist es bekannt, Verbindungselemente als Gussteile herzustellen, wie z.B. aus der GB 2 419 150 A bekannt. Deren Herstellung ist jedoch aufwändig und kostenintensiv. Des Weiteren besteht die Gefahr von Materialinhomogenitäten, Lunkern und bei Reperaturen das Problem der nicht oder nur sehr eingeschränkten Schweißbarkeit für Reperaturschweißungen. Aufgabe der vorliegenden Erfindung ist es Bauteile, insbesondere Verbindungs- bzw. Knotenelemente bereitzustellen, die die zuvor aufgeführten Nachteile vermeiden. Die zuvor aufgezeigte Aufgabe wird erfindungsgemäß durch ein Verfahren zum Herstellen eines Verbindungselements, insbesondere für Stahlkonstruktionen von Türmen, vorzugsweise für Windkraftanlagen mit den Merkmalen des Anspruchs 1 gelöst.Moreover, it is known to produce fasteners as castings, such as from the GB 2 419 150 A known. However, their production is complex and costly. Furthermore, there is the risk of material inhomogeneities, voids and in repairs the problem of not or only very limited weldability for Reperaturschweißungen. Object of the present invention is to provide components, in particular connection or node elements, which avoid the disadvantages listed above. The above-indicated object is achieved by a method for producing a connecting element, in particular for steel structures of Towers, preferably for wind turbines having the features of claim 1.

Erfindungsgemäß wird bei dem Verfahren aus einem Rohling mittels eines Drückwalzprozesses ein Flansch und ein sich an dem Flansch einstückig anschließender Mantel hergestellt. Anschließend wird das dem Flansch gegenüberliegende Ende des Mantels an die Kontur des Bauteils angepasst, mit dem der Mantel verbunden werden soll. Als Rohling wird vorzugsweise eine Ronde, ein Rohrabschnitt oder ein Schmiederohling verwendet.According to the invention in the method of a blank by means of a flow-forming process, a flange and a flange integrally connected to the flange is produced. Subsequently, the flange of the opposite end of the shell is adapted to the contour of the component with which the jacket is to be connected. As a blank, a blank, a pipe section or a forging blank is preferably used.

Unter Drückwalzen wird ein Fertigungsverfahren der Umformtechnik verstanden, das zur Herstellung zumeist rotationssymmetrischer Hohlkörper dient.
Beim Drücken wird ein kreisförmiger Blechzuschnitt, die sogenannte Ronde, vor die Stirnseite eines Drückfutters gespannt. Das Drückfutter stellt dabei das die Geometrie des Bauteils als Innenform formgebende Werkzeug dar. Das Futter wird dann zusammen mit der Ronde vom Hauptspindelantrieb der Drückmaschine in Rotation versetzt.The term "spinning rollers" is understood to mean a production method of the forming technique which is used for producing mostly rotationally symmetrical hollow bodies.
When pressing a circular sheet metal blank, the so-called Ronde, tensioned in front of the end face of a spinning chuck. The spinning chuck represents the tool that shapes the geometry of the component as an inner mold. The chuck is then set in rotation together with the blank by the main spindle drive of the spinning machine.

Die eigentliche Umformung der Ronde zum Bauteil erfolgt in mehreren Stufen durch ein Drückwerkzeug, das beispielsweise Schritt für Schritt von der Mitte der Ronde zum Rand und wieder zurück bewegt wird. Durch das Fortschreiten dieser Bewegung in axialer Richtung nähert sich die Ronde nach und nach der Geometrie des Futters an. Bei industriellen Prozessen wird als Werkzeug oftmals eine Drückrolle eingesetzt und die Bewegung wird computergesteuert durchgeführt.The actual forming of the blank to the component takes place in several stages by a spinning tool, which is moved, for example, step by step from the center of the blank to the edge and back again. As this movement progresses in the axial direction, the blank gradually approaches the geometry of the chuck. In industrial processes, a spinning roller is often used as a tool and the movement is computer-controlled.

Somit werden erfindungsgemäß Verbindungs- bzw. Knotenelemente bereitgestellt, die sich gut an benachbarte Bauteile anbinden lassen, einen gegenüber dem Stand der Technik verbesserten Kraftfluss aufweisen und günstig herstellbar sind. Zudem kann der Anschluss des Verbindungselements in der gewünschten Lage und Position ermöglicht werden, indem das dem Flansch gegenüber liegende Ende jeweils angepasst wird. Ebenso sind verschiedene Größen und Längen möglich, die bei entsprechendem Beschnitt auch eine stark abgewinkelte Positionierung erlauben. Ein weiterer Vorteil der Erfindung liegt darin, dass die erfindungsgemäß hergestellten Verbindungselemente keine Schweißnaht aufweisen, wie etwa durch Biegen hergestellte Bauteile, so dass die Kerbwirkung verringert ist. Die Vorteile der vorliegenden Erfindung liegen demnach in der Reduzierung der Teilezahl, der entfallenden Schweißnaht im Flanschbereich und dem verbesserten Kraftfluss.Thus, according to the invention, connection or node elements are provided which can be easily connected to adjacent components, have a force flow which is improved compared to the prior art and can be produced inexpensively. In addition, the connection of the connecting element in the desired position and position can be made possible by the opposite end of the flange is respectively adapted. Likewise, different sizes and lengths are possible at Corresponding trimming also allow a strong angled positioning. A further advantage of the invention is that the connecting elements produced according to the invention have no weld seam, such as components produced by bending, so that the notch effect is reduced. The advantages of the present invention are accordingly the reduction of the number of parts, the missing weld in the flange area and the improved power flow.

Außerdem wird die Materialstärke des Flansches durch Aufschieben während des Drückwalzens gegenüber der Materialstärke des Rohlings erhöht. Insbesondere wird dabei der Übergang zwischen dem Flansch und dem Mantel mit einer fließenden Wandstärke ausgebildet. Durch die individuelle Einstellbarkeit der Wanddicke in den verschiedenen Bereichen des Verbindungselements werden besondere Vorteile erreicht. Insbesondere können die durch den Drückwalzprozess in die Struktur eingebrachten Druckeigenspannungen eingestellt werden, die somit die Dauerfestigkeit deutlich verbessern.In addition, the material thickness of the flange is increased by pushing during the flow-forming against the material thickness of the blank. In particular, the transition between the flange and the jacket is formed with a flowing wall thickness. Due to the individual adjustability of the wall thickness in the different areas of the connecting element special advantages are achieved. In particular, the compressive residual stresses introduced into the structure by the flow-forming process can be set, thus significantly improving fatigue strength.

In weiter bevorzugter Weise wird der Flansch innen liegend ausgebildet, In diesem Fall ist es bevorzugt, als Rohling eine Ronde zu verwenden. Durch das Drückwalzen kann die Materialdicke am Flansch durch Abstrecken bzw. Aufschieben von Material aus benachbarten Bereichen, insbesondere aus im späteren Beschnitt entfallenden Bereichen eingestellt werden. Hierdurch wird die Stabilität des innen liegenden Flansches erhöht und gleichzeitig die Verschnittmenge reduziert.In a further preferred manner, the flange is formed on the inside, in which case it is preferable to use a blank as the blank. By means of spin forming, the material thickness on the flange can be adjusted by stretching or pushing material from adjacent regions, in particular from regions which are allocated in the later trimming. As a result, the stability of the inner flange is increased while reducing the amount of waste.

Alternativ dazu kann der Flansch außen liegend ausgebildet werden. In diesem Fall ist es bevorzugt, als Rohling einen Rohrabschnitt oder einen Schmiederohling zu verwenden. Ein sich verjüngender Übergangsbereich wird dann innen als Mantel ausgeformt, der mit einem Ende einer Mastkonstruktion, insbesondere eines Eckstiels verschweißt wird.Alternatively, the flange can be formed outboard. In this case, it is preferable to use as a blank a pipe section or a forging blank. A tapered transition region is then formed internally as a jacket, which is welded to one end of a mast construction, in particular a corner handle.

Des Weiteren kann der Mantel konisch ausgebildet werden, wobei der Flansch am verjüngten Ende des Mantels ausgebildet wird. Dadurch wird eine besonders stabile Konstruktion erreicht, indem das aufgeweitete Ende des Mantels mit einem größeren Querschnitt mit der Mastkonstruktion verbunden wird, während der Querschnitt des Flansches an die anzubringende Strebe angepasst ist.Furthermore, the sheath may be conical, with the flange formed at the tapered end of the sheath. As a result, a particularly stable construction is achieved by connecting the flared end of the shell with a larger cross section to the mast construction, while the cross section of the flange is adapted to the strut to be attached.

In bevorzugter Weise wird das dem Flansch gegenüberliegende Ende des Mantels durch Beschnitt an die Außenkontur des Bauteils angepasst, wozu insbesondere ein Schneiden mit Laser oder Wasserstrahl oder ein Plasma- oder Brennschneiden angewendet wird. Somit kann das offene Ende des vorzugsweise konischen Mantels nach dem Beschnitt an die Außenkontur der Mastkonstruktion, insbesondere des Eckstiels angeschweißt werden.Preferably, the flange of the opposite end of the shell is adjusted by trimming to the outer contour of the component, including in particular a laser or water jet cutting or a plasma or flame cutting is applied. Thus, the open end of the preferably conical jacket can be welded after the trimming to the outer contour of the mast construction, in particular the corner post.

Ebenso ist es möglich, das dem Flansch gegenüberliegende Ende des Mantels mit einem weiteren Flansch zu versehen. In diesem Fall weist das Verbindungselement zu beiden Seiten des Mantels einen Flansch auf, wobei der erste Flansch zum Verbinden mit einer Strebe und der weitere Flansch zum Verbinden mit einer Mastkonstruktion bzw. mit einem Eckstiel vorgesehen ist.It is also possible to provide the flange of the opposite end of the shell with a further flange. In this case, the connecting element on both sides of the shell on a flange, wherein the first flange for connection to a strut and the further flange is provided for connection to a mast construction or with a corner post.

Dabei ist es weiterhin bevorzugt, dass der weitere Flansch durch Drückwalzen ausgebildet wird, wodurch die oben beschriebenen Vorteile auch an diesem Ende des Mantels erzielt werden.It is further preferred that the further flange is formed by spin forming, whereby the advantages described above are also achieved at this end of the shell.

Ganz allgemein und unabhängig von der speziellen Ausgestaltung als Verbindungs- bzw. Knotenelement kann das beschriebene Verfahren auch verwendet werden, um Flanschanschlüsse für beliebige Rohre zu erzeugen. Diese Anwendung ergibt die gleichen Vorteile hinsichtlich Materialstärken und Spannungseigenschaften. Für Außenflansche bietet sich auch hier die Verwendung eines Rohrabschnitts oder Schmiederohlings, anstelle einer Ronde für den Drückwalzprozess für einen Innenflansch an. Des Weiteren wird das Verfahren hinsichtlich der Abmessungen nur durch die Größe der Drückwalzmaschine beschränkt. Eine entsprechend große Maschine wäre in der Lage auch die Flansche für die Turmhauptrohre, insbesondere für Windkraftanlagen zu erzeugen.In general, and regardless of the specific configuration as a connection or node element, the described method can also be used to produce flange connections for any pipes. This application gives the same advantages in terms of material thickness and stress properties. For external flanges, the use of a pipe section or forging blank, instead of a blank for the flow-forming process for an inner flange, also offers itself here. Furthermore, the method is limited in terms of dimensions only by the size of the flow-forming machine. A correspondingly large Machine would also be able to produce the flanges for the tower main pipes, especially for wind turbines.

Die oben aufgezeigte Aufgabe wird erfindungsgemäß auch durch ein Verbindungselement gemäß Anspruch 10 gelöst.The above object is achieved according to the invention by a connecting element according to claim 10.

Mit dieser Konstruktion werden die gleichen Vorteile erzielt, wie sie zuvor anhand des erfindungsgemäßen Verfahrens erläutert worden sind.With this construction, the same advantages are achieved as they have been previously explained by the method according to the invention.

Weitere Merkmale und Vorteile der vorliegenden Erfindung ergeben sich aus den Unteransprüchen sowie aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der beigefügten Zeichnung. In der Zeichnung zeigen:

Fig. 1
ein erstes Ausführungsbeispiel eines erfindungsgemäßen Verbindungselements in einer Seitenansicht,
Fig. 2
das in Fig. 1 gezeigte Ausführungsbeispiel im Querschnitt entlang der dort gezeigten Linie II-II,
Fig. 3
das in den Fig. 1 und 2 dargestellte Ausführungsbeispiel in einer Draufsicht,
Fig. 4
das in den Fig. 1 bis 3 dargestellte Ausführungsbeispiel im verbundenen Zustand mit einem Rohr in einer perspektivischen Darstellung,
Fig. 5
ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Verbindungselements im Querschnitt im verbundenen Zustand mit einem Rohr und
Fig. 6
eine schematische Darstellung zur Erläuterung des erfindungsgemäßen Verfahrens.
Further features and advantages of the present invention will become apparent from the dependent claims and from the following description of exemplary embodiments with reference to the accompanying drawings. In the drawing show:
Fig. 1
A first embodiment of a connecting element according to the invention in a side view,
Fig. 2
this in Fig. 1 shown embodiment in cross section along the line II-II shown there,
Fig. 3
that in the Fig. 1 and 2 illustrated embodiment in a plan view,
Fig. 4
that in the Fig. 1 to 3 illustrated embodiment in the connected state with a pipe in a perspective view,
Fig. 5
a further embodiment of a connecting element according to the invention in cross-section in the connected state with a pipe and
Fig. 6
a schematic representation for explaining the method according to the invention.

In den Fig. 1 bis 4 wird ein erstes Ausführungsbeispiel eines erfindungsgemäßen Verbindungs- bzw. Knotenelements 10 dargestellt.In the Fig. 1 to 4 a first embodiment of a connection or node element 10 according to the invention is shown.

Das dargestellte Verbindungs- bzw. Knotenelement 10, im Folgenden nur Verbindungselement genannt, ist insbesondere für Stahlkonstruktionen von Türmen, vorzugsweise für Windkraftanlagen geeignet und insbesondere mit einem erfindungsgemäßen Verfahren hergestellt.The illustrated connecting or node element 10, hereinafter referred to as the connecting element, is particularly suitable for steel structures of towers, preferably for wind turbines, and in particular produced by a method according to the invention.

Das Verbindungselement 10 weist einen Flansch 12 und einen Mantel 14 auf, wobei sich der Mantel 14 einstückig an dem Flansch 12 anschließt und wobei das dem Flansch 12 gegenüberliegende Ende des Mantels 14 an die Kontur des Bauteils einer Stahlkonstruktion, insbesondere eines rohrförmigen Eckstiels 30 mit rundem oder polygonen Querschnitt angepasst ist, mit dem der Mantel 14 verbunden werden soll.The connecting element 10 has a flange 12 and a jacket 14, wherein the jacket 14 integrally adjoins the flange 12 and wherein the flange 12 opposite end of the jacket 14 to the contour of the component of a steel structure, in particular a tubular Eckstiels 30 with round or polygonal cross-section is adapted to which the jacket 14 is to be connected.

Vorliegend weist der Mantel 14 eine konische Form auf, die einen ebenfalls konisch, aber mit flacheren Winkel verlaufenden Abschnitt 16 aufweist. Der Flansch 12 ist dabei mit dem verjüngten Ende des konischen Mantels 14 verbunden.In the present case, the jacket 14 has a conical shape which also has a section 16 which is also conical but at a shallower angle. The flange 12 is connected to the tapered end of the conical jacket 14.

Des Weiteren ist ein zylindrischer Abschnitt 18 vorgesehen, der den Flansch 12 mit dem Mantel 14 und 16 verbindet.Furthermore, a cylindrical portion 18 is provided, which connects the flange 12 with the jacket 14 and 16.

Im dargestellten Ausführungsbeispiel ist der Flansch 12 innen liegend ausgebildet und bildet eine Öffnung 20 aus. Mit dem Flansch 12 können in herkömmlicher Weise Streben einer Stahlkonstruktion verbunden werden. Die dem Flansch 12 gegenüberliegende Öffnung des Mantels 14 bzw. des Abschnitts 16 ist für die Anlage an einer zylindrischen Konstruktion die beispielsweise eines rohrförmigen Eckstiels 30 angepasst. Entlang der Außenkante des Mantels 14 bzw. des Abschnitts 16 kann das Verbindungselement 10 mit dem Eckstiel 30 verschweißt werden.In the illustrated embodiment, the flange 12 is formed lying inside and forms an opening 20. With the flange 12 can in a conventional manner Strive to be connected to a steel structure. The flange 12 opposite opening of the shell 14 and the portion 16 is adapted for contact with a cylindrical construction, for example, a tubular Eckstiels 30. Along the outer edge of the jacket 14 or of the section 16, the connecting element 10 can be welded to the corner post 30.

Wie sich insbesondere aus Fig. 4 ergibt, ist bei dem in den Fig. 1 bis 3 dargestellten Ausführungsbeispiel die Achse des Verbindungselements 10 weitgehend senkrecht zur Achse des Eckstiels 30 ausgerichtet.As can be seen in particular Fig. 4 is, in which in the Fig. 1 to 3 illustrated embodiment, the axis of the connecting element 10 largely aligned perpendicular to the axis of the Eckstiels 30.

Fig. 5 zeigt nun ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Ausgestaltung des Verbindungselements 10. Bei diesem Ausführungsbeispiel weist der Mantel 14 einen zylindrischen Abschnitt 22 auf, der schräg zur Achse des Verbindungselements 10 abgetrennt ist. Somit kann das Verbindungselement 10 in einem Winkel mit dem Eckstiel 30 verbunden werden. Fig. 5 Now shows a further embodiment of an inventive embodiment of the connecting element 10. In this embodiment, the jacket 14 has a cylindrical portion 22 which is separated obliquely to the axis of the connecting element 10. Thus, the connecting member 10 can be connected at an angle with the corner post 30.

Fig. 6 zeigt in einer schematischen Darstellung den grundsätzlichen Ablauf eines erfindungsgemäßen Verfahrens zum Herstellen eines Verbindungs- oder Knotenelements 10, insbesondere für Stahlkonstruktionen von Türmen, vorzugsweise für Windkraftanlagen, bei dem aus einem Rohling 40 mittels eines Drückwalzprozesses ein Flansch 12 und ein sich an dem Flansch 12 einstückig anschließender Mantel 14 hergestellt wird. Fig. 6 shows a schematic representation of the basic sequence of a method according to the invention for producing a connecting or node element 10, in particular for steel structures of towers, preferably for wind turbines, in which from a blank 40 by means of a flow-forming process a flange 12 and integrally on the flange 12 subsequent coat 14 is produced.

Anschließend wird das dem Flansch 12 gegenüberliegende Ende des Mantels 14 an die Kontur des Bauteils, beispielsweise eines Eckstiels 30 angepasst, mit dem der Mantel 14 verbunden werden soll. Dieser letzte Schritt wird in der Zeichnung nicht dargestellt.Subsequently, the flange 12 opposite end of the jacket 14 is adapted to the contour of the component, such as a corner handle 30, with which the jacket 14 is to be connected. This last step is not shown in the drawing.

Beim vorliegenden Beispiel wird als Rohling eine Ronde 40 aus Stahl verwendet.In the present example, a blank 40 made of steel is used as the blank.

Die Ronde 40 wird zwischen einer Spindel 50 einer Drückwalzmaschine und einer die Geometrie des Verbindungselements 10 als Innenform formgebenden Spindel 52 eingespannt. Mit den schematisch dargestellten Drückwerkzeugen 54 und 56 wird die Ronde 40 so umgeformt, dass nach Beendigung des Drückwalzens die gewünschte Form des Verbindungselements 10 erreicht wird,The blank 40 is clamped between a spindle 50 of a flow-forming machine and a spindle 52 which shapes the geometry of the connecting element 10 as an inner mold. With the schematically illustrated pressing tools 54 and 56, the blank 40 is reshaped so that after completion of the flow-forming the desired shape of the connecting element 10 is achieved,

Insbesondere zeigt Fig. 6 auch den Umformschritt, mit dem die Materialstärke des Flansches 12 durch Aufschieben während des Drückwalzens gegenüber der Materialstärke der Ronde 40 erhöht wird. Das Ausgangsmaterial der Ronde 40 ist dabei dünner als der später ausgebildete Flansch 12. Hierzu wird Material aus dem späteren mittig angeordneten Beschnitt 58 verschoben und so eine größere Dicke des Flansches 12 erzeugt. Das hat den besonderen Vorteil, dass weniger Beschnitt 58 aus der Mitte anfällt und der abgestreckte äußere Mantel 14 aus dünnerem Material erzeugt werden kann.In particular shows Fig. 6 Also, the forming step, with the material thickness of the flange 12 is increased by pushing during the flow-spinning against the material thickness of the round blank 40. The starting material of the blank 40 is thinner than the later formed flange 12. For this purpose, material is shifted from the laterally arranged trim 58 and thus produces a greater thickness of the flange 12. This has the particular advantage that less trim 58 is obtained from the middle and the ironed outer jacket 14 can be made of thinner material.

Claims (14)

  1. Method for producing a connecting element (10) for steel structures of towers, preferably for wind turbines,
    - in which a flange (12) and a casing (14, 16) integrally adjoining the flange are produced from a blank by means of a flow forming process,
    - in which the material thickness of the flange is increased in relation to the material thickness of the blank by thrust during the flow forming, and
    - in which, subsequently, that end of the casing which is opposite the flange is adapted to the contour of the component to which the casing is intended to be connected.
  2. Method according to Claim 1, in which a circular blank, a tubular section or a forged blank is used as the blank.
  3. Method according to either of Claims 1 and 2, in which the transition between the flange and the casing is formed with a flowing wall thickness.
  4. Method according to any of Claims 1 to 3, in which the flange is formed located on the inside.
  5. Method according to one of Claims 1 to 3, in which the flange is formed located on the outside.
  6. Method according to one of Claims 1 to 5, in which the casing is formed conically and the flange is formed at the tapered end of the casing.
  7. Method according to one of Claims 1 to 6, in which that end of the casing which is opposite the flange is adapted to the outer contour of the component by trimming.
  8. Method according to one of Claims 1 to 7, in which that end of the casing which is opposite the flange is provided with a further flange.
  9. Method according to Claim 8, in which the further flange is formed by flow forming.
  10. Connecting element for steel structures of towers, preferably for wind turbines, produced by a method according to one of Claims 1 to 9,
    - with a flange (12), and
    - with a casing (14, 16),
    - wherein the casing (14, 16) integrally adjoins the flange (12),
    - wherein the material thickness of the flange is increased in relation to the material thickness of the blank by thrust during the flow forming, and
    - wherein that end of the casing (14, 16) which is opposite the flange (12) is adapted to the contour of the component to which the casing is intended to be connected.
  11. Connecting element according to Claim 10, characterized in that the flange (12) is formed located on the inside.
  12. Connecting element according to Claim 10, characterized in that the flange (12) is formed located on the outside.
  13. Connecting element according to either of Claims 11 and 12, characterized in that the casing (14, 16) is of conical design at least in sections, and the flange (12) is formed at the tapered end of the casing (14, 16).
  14. Connecting element according to one of Claims 11 to 13, characterized in that that end of the casing (14, 16) which is opposite the flange (12) is provided with a further flange (12).
EP14765918.9A 2013-09-24 2014-09-11 Method for producing a connection element, and connection element Active EP3049199B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013110528.9A DE102013110528A1 (en) 2013-09-24 2013-09-24 Method for producing a connecting element and connecting element
PCT/EP2014/069361 WO2015043968A1 (en) 2013-09-24 2014-09-11 Method for producing a connection element, and connection element

Publications (2)

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EP3049199A1 EP3049199A1 (en) 2016-08-03
EP3049199B1 true EP3049199B1 (en) 2019-11-06

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US (1) US10352060B2 (en)
EP (1) EP3049199B1 (en)
CN (1) CN105579160A (en)
DE (1) DE102013110528A1 (en)
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WO2015043968A1 (en) 2015-04-02
US20160215517A1 (en) 2016-07-28
CN105579160A (en) 2016-05-11
DE102013110528A1 (en) 2015-03-26
EP3049199A1 (en) 2016-08-03
US10352060B2 (en) 2019-07-16

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