DE102022103815B4 - Bending a sheet of metal into a piece of pipe - Google Patents

Abstract

Method for bending a sheet metal (5) into a pipe section (8) using a round bending machine (2), the method comprising the following steps, which are carried out one after the other in the specified order: a) bending a first section (6) of the sheet metal (5 ),b) bending a second section (7) of the sheet (5), the sheet (5) being fed to the bending device (2) along a feed direction (r) in steps a) and b), the round bending machine (2 ) in step a) is held in a first orientation (9) relative to the feed direction (r), and wherein the round bending machine (2) in step b) in a second orientation (10) relative to the feed direction that is different from the first orientation (9). (r) is held.

Description

The invention relates to a method and a device for bending a sheet of metal into a piece of pipe and a method based on this for producing a pile for a wind turbine.

Piles for wind turbines are usually made from bent sheets. The sheets used can weigh over 100 t and be over 50 m long. Correspondingly large forces are required to bend such sheets.

Various methods and devices for bending such sheets are known. With the known solutions, however, the beginning of the bending is often problematic. A well-known approach to solving this problem is to bend the sheet metal in two passes. However, this is time-consuming. In addition, known solutions have the problem that the bending moments are not constant and consequently no uniform bending is achieved. A solution for bending sheets into tubular bodies for fluid transport is from the publication EP 0 011 096 A1 known.

The object of the present invention is, based on the described prior art, to present a method and a device with which a sheet metal can be bent into a piece of pipe easily, cheaply, quickly and precisely. In addition, a corresponding process for producing a pile for a wind turbine will be presented.

These tasks are solved with the methods and the device according to the independent claims. Further advantageous embodiments are specified in the dependent claims. The features presented in the claims and in the description can be combined with one another in any technologically sensible manner.

1. a) Biegen eines ersten Abschnitts des Blechs,
2. b) Biegen eines zweiten Abschnitts des Blechs,

wobei das Blech in den Schritten a) und b) entlang einer Zuführrichtung der Biegeeinrichtung zugeführt wird, wobei die Biegeeinrichtung im Schritt a) in einer ersten Orientierung relativ zur Zuführrichtung gehalten ist, und wobei die Biegeeinrichtung im Schritt b) in einer von der ersten Orientierung verschiedenen zweiten Orientierung relativ zur Zuführrichtung gehalten ist.According to the invention, a method for bending a sheet metal into a piece of pipe using a bending device is presented. The procedure includes the following steps, which are carried out sequentially in the specified order:

1. a) bending a first section of the sheet,
2. b) bending a second section of the sheet,

wherein the sheet metal is fed in steps a) and b) along a feed direction of the bending device, the bending device in step a) being held in a first orientation relative to the feed direction, and wherein the bending device in step b) in one of the first orientation different second orientation is held relative to the feed direction.

A sheet of metal can be bent using the method described. The sheet is preferably made of metal, in particular steel. However, it is also conceivable to apply the process to other types of bendable sheets.

The process is particularly suitable for large and heavy sheets. This can be quantified as shown below. The sheet preferably has a mass of at least 1 t [ton], in particular at least 5 t. For example, the sheet metal can have a mass in the range of 10 and 200 t, in particular in the range of 30 and 150 t. The sheet preferably has a thickness of at least 1 cm, in particular at least 5 cm. For example, the sheet metal can have a thickness in the range of 3 and 20 cm, in particular in the range of 5 and 10 cm. Preferably, the sheet has a length and/or width of at least 1 m, in particular of at least 5 m. For example, the sheet can have a length and/or width in the range of 10 and 100 m, in particular in the range of 20 and 50 m. Also If the advantages of the method described can be achieved to a particular extent with such large and heavy sheets, the application of the method to sheets of any size is conceivable.

The process can be used to bend a sheet of metal into a piece of pipe. The pipe section is preferably closed circumferentially. In this case, the pipe section can also be referred to as a pipe section. In this case, the pipe section has the shape of a cylindrical jacket or a conical jacket. The pipe section preferably has the shape of a cylindrical jacket. In the case of a pipe section with the shape of a cone shell, it is preferred that the cone shell encloses an angle of less than 20° with an axis of the cone, in particular of less than 10°. In the case of a pipe section with the shape of a conical shell, the pipe section can also be referred to as a conical pipe section.

If the pipe section is closed circumferentially, as is preferred, a pipe can be obtained by axially assembling several pipe sections. In this case, a piece of pipe differs from a pipe only quantitatively in terms of length. If several cylindrical pipe pieces are put together axially, a cylindrical pipe is obtained, i.e. a pipe with a constant diameter. If several conical pipe pieces with different diameters that are coordinated with one another are put together axially, a conical pipe can be obtained, i.e. a pipe with a continuously changing diameter. For example, a cylindrical one Pipe section, a cone-shaped pipe section and another cylindrical pipe section axially assembled in the specified order, a pipe is obtained whose diameter changes in the area of the cylindrical pipe section.

However, it is also conceivable that the pipe section is not closed circumferentially. In this case, the cross section of the pipe section only forms part of a full circle. In this case, the pipe section has the shape of part of a cylindrical jacket or conical jacket. In this case, a pipe can be obtained by placing several pipe pieces together circumferentially to obtain a circumferentially closed pipe section. Several such pipe sections can be placed axially together to obtain the pipe.

The piece of pipe can in particular be used to obtain a pile, for example for a wind turbine or another structure. Such piles often have a diameter of the order of 10 m, so that correspondingly thick sheets have to be bent to produce such piles. For example, the pile can have a diameter of up to 25 m, in particular up to 16 m.

The pile can be used offshore or onshore. The pile can be used, for example, as a monopile or as one of several piles of a structure such as an offshore wind turbine, for example in the form of a so-called tripod, jacket or triple foundation. In the case of an offshore structure, the pile can be completely or partially sunk into a seabed when assembled, can be completely or partially arranged between the seabed and the water surface and/or can be completely or partially arranged above the water surface.

Using the method described, sheets can also be bent for other types of foundations of a building. For example, the method described can also be used to bend a sheet metal for a gravity foundation of a structure such as an offshore wind turbine.

The sheet metal is bent using a bending device. The bending device preferably has an inlet side on which the sheet metal can be fed to the bending device in a feed direction, and an outlet side on which the sheet metal can leave the bending device again.

The bending device is preferably designed as a round bending machine. Such a roll works according to the known method of roll rounding and has at least three and, in a particularly preferred embodiment, four rolls. The sheet metal to be bent is clamped between two rollers, at least one of which is motor-driven, so that the clamped sheet metal can be moved by rotating the rollers. To bend the sheet, a bending force is exerted on the sheet by means of at least one of the further rollers. Depending on the geometric arrangement of the rolls and the properties of the sheet, it can be moved between the rolls of the bending machine by means of at least one of the driven rolls in such a way that the sheet is bent over its length. The smallest possible bending radius is limited by the diameter of the roller arranged in the bending direction. However, the method described can also be used with bending devices of any other type.

The sheet metal preferably lies in a horizontal plane when it is fed to the bending device. The feed direction is preferably parallel to this plane. For example, in the case of a rectangular sheet, the feed direction is preferably parallel to one of the sides of the sheet, particularly preferably to the longer side of the sheet. The sheet metal can be fed to the bending device via a feed device. The feed device preferably has a roller table. In this case, the sheet metal can be fed to the bending device via rollers. Preferably, the sheet metal is held by the feed device during the process if it has not yet been fed to the bending device. Particularly preferably, the sheet metal is held over its entire extent by the feed device during the process, as long as it has not yet been fed to the bending device. This can be achieved in that the sheet metal, as long as it has not yet been fed to the bending device, is supported over its entire extent by rollers that are arranged in a two-dimensional grid. In particular, the sheet metal is not only held at a single point outside the bending device, for example by a crane that only attacks the end of the sheet metal facing away from the bending device. In such a case, the sheet metal could bend in the area outside the bending device, which would represent an undesirable deformation. Accordingly, the pipe section could not be produced precisely or could only be produced with additional effort.

Using the method described, the sheet metal is bent in sections. In step a), a first section of the sheet is bent. In step b), a second section of the sheet is bent. Steps a) and b) are carried out one after the other in the order given. step b) So begins after step a) is completed. An interruption can be provided between steps a) and b). However, it is also conceivable that steps a) and b) follow one another directly. In this case, the sheet can be bent continuously without a break between steps a) and b).

In both step a) and step b), the sheet metal is fed to the bending device in the feed direction. Preferably, the sheet is bent in both step a) and step b) by generating a bending moment on the sheet via rollers of the bending device. Preferably, the sheet metal is bent in the same direction in steps a) and b). The sheet metal therefore preferably has the same curvature in the first section as in the second section. On the finished pipe section, the first section can preferably no longer be distinguished from the second section. In this case, the only difference between the two sections is how and when the sheet metal was bent in the respective section. It is an aim of the method described that a uniformly curved piece of pipe is obtained.

By dividing the process into steps a) and b), the fact can be taken into account that special force conditions exist at the start of bending. If the sheet were bent in just one step, the beginning of the sheet would have a different curvature than the rest of the sheet. The method described is based on the knowledge that this can be prevented by tilting the bending device at the start of bending. Accordingly, the method is divided into steps a) and b), with the bending device being oriented differently relative to the feed direction in steps a) and b). Thus, in step a) the bending device is held in a first orientation relative to the feed direction and in step b) it is held in a second orientation relative to the feed direction that is different from the first orientation. It has been shown that tilting the bending device to begin bending can compensate for the effect that the beginning of the sheet is generally bent differently than the rest of the sheet. By tilting the bending device, it can be ensured that the inlet of the sheet metal into the bending device remains straight. This is particularly advantageous in the case of a horizontal inlet.

The first section of the sheet can also be called the beginning of the sheet because this part of the sheet is bent first. It is sufficient that the first section along the feed direction is long enough to compensate for the effect that the beginning of the sheet is generally bent differently than the rest of the sheet. Preferably, the first section of the sheet extends along the feed direction over a maximum of 30% of the sheet, in particular over a maximum of 10%. For example, the first section of the sheet can extend over 5 to 20% of the sheet along the feed direction.

In a particularly simple embodiment, the sheet metal is only bent in steps a) and b). Accordingly, the sheet only has the first section and the second section, which directly adjoin one another. However, the process can also be divided into more than two steps. The sheet metal can have additional sections accordingly. The further steps can be inserted before step a), between steps a) and b) and/or after step b). Accordingly, the sheet metal can have further areas in front of the first section, between the first section and the second section and/or behind the second section.

The second orientation of the bending device can also be referred to as a basic orientation. In the second orientation, the bending device can be arranged, for example, perpendicular to a floor of a factory hall. This refers to an axis of the bending device. The axis of the bending device can, for example, be an axis of symmetry, with respect to which the bending device is designed symmetrically. However, it is not necessary that the bending device is arranged exactly perpendicular to the floor of the factory hall in its second orientation. It is preferred that an axis of the bending device forms an angle in the range of 70 and 110° with the horizontal. Depending on the design of the bending device, the first orientation can also be the basic orientation.

Compared to the second orientation, the bending device is tilted in its first orientation. Preferably, the bending device is tilted in its first orientation by an angle in the range of 3 to 30°, in particular in the range of 5 to 15°, compared to its second orientation. How far the bending device is tilted is preferably decided depending on the sheet thickness. The second orientation is preferably always the same and preferably always corresponds to the basic orientation. In this case, the extent to which the bending device is tilted in the first orientation relative to the basic orientation is preferably decided depending on the sheet thickness.

The process described offers the advantage that the sheet metal can be bent in just one move. In this respect, the method described can significantly speed up the production of a piece of pipe. There is also a horizontal inlet sufficient. In particular, the sheet does not have to be lifted with a crane, for example. This can reduce costs.

In a preferred embodiment of the method, the bending device is tilted in its first orientation relative to its second orientation opposite to the feed direction.

In this embodiment, a top side of the bending device is displaced in the first orientation in comparison to the second orientation against the feed device. An inlet side of the bending device is therefore generally arranged closer to the feed device in the first orientation of the bending device than in the second orientation of the bending device. It has been found that this tilting promotes upward bending of the first section of the sheet metal. Accordingly, in this embodiment it is particularly preferred that the sheet metal is bent upwards using the bending device.

Particularly when the sheet metal is bent downwards, it is alternatively preferred that the bending device is tilted in its first orientation relative to its second orientation in the feed direction. Regardless of the direction of the bend, it can make sense to tilt the bending device as described.

• - an einer Oberseite einer ersten Seitenwalze der Biegeeinrichtung,
• - an einer Unterseite einer Oberwalze der Biegeeinrichtung und
• - an einer Oberseite einer Unterwalze der Biegeeinrichtung

geführt wird.In a further preferred embodiment of the method, the sheet is bent in step a) by moving the sheet along the feed direction in the specified order

• - on an upper side of a first side roller of the bending device,
• - on an underside of an upper roller of the bending device and
• - On an upper side of a lower roller of the bending device

to be led.

The specified order in which the sheet passes the rolls refers to the order in which a specific point on the sheet passes the rolls, for example the beginning of the sheet. For example, a subsequent point of the sheet may be in contact with the first side roll while the beginning of the sheet has already reached the bottom roll. In this respect, the sheet metal is in contact with the three rollers mentioned at the same time during bending.

The first section can therefore be bent by exerting an upward force on the sheet by the first side roller and the lower roller, while a downward force is exerted on the sheet by the top roller, with the upper roller between the first side roller and the bottom roller attacks the sheet metal. For this purpose, it is preferred that the sheet metal is guided in step a) with contact on the top of the first side roll, on the underside of the top roll and on the top of the bottom roll.

In the second orientation of the bending device, the upper roller and the lower roller are preferably arranged one above the other. A connecting line between an axis of the upper roller and an axis of the lower roller is preferably perpendicular to the horizontal. If the bending device is tilted from its second orientation into its first orientation in this case, the upper roller and the lower roller are no longer arranged directly one above the other as described. Rather, in the first orientation of the bending device, the upper roller is arranged laterally offset relative to the lower roller against the feed direction. If the sheet metal is fed to the bending device, it first hits the top roll (after the first side roll) and only at a distance does it hit the bottom roll. As a result, a bending moment can be generated by holding the lower roller and the first side roller on a plane parallel to the sheet and supporting the sheet to this extent, while the top roller exerts a force on the sheet from above.

After the sheet has passed the top of the lower roller, it is preferably guided on an upper side of a second side roller. The second side roller can support the bending or simply serve to absorb part of the weight of the sheet and thus prevent unwanted deformation. The second side roller is preferably spaced from the lower roller in the feed direction. Step a) can be completed in particular when the sheet has reached the second side roller.

• - zwischen einer Unterseite einer Oberwalze der Biegeeinrichtung und einer Oberseite einer Unterwalze der Biegeeinrichtung und
• - an einer Oberseite einer zweiten Seitenwalze der Biegeeinrichtung

geführt wird.In a further preferred embodiment of the method, the sheet is bent in step b) by moving the sheet along the feed direction in the specified order

• - between an underside of an upper roll of the bending device and an upper side of a lower roll of the bending device and
• - On an upper side of a second side roller of the bending device

to be led.

In the second orientation of the bending device, the upper roller and the lower roller are preferably arranged one above the other. A connecting line between an axis of the upper roller and an axis of the lower roller is preferred perpendicular to the horizontal. The sheet passes through the lower roller and the upper roller at the same time. This allows the sheet metal to be supported by the bottom roll and the top roll, while the second side roll exerts an upward force on the sheet metal. This allows the sheet metal to be bent upwards. For this purpose, it is preferred that the sheet metal is guided in step a) with contact on the underside of the top roller and on the top of the second side roller. Contact with the top of the bottom roller is possible but not required.

Preferably, the sheet is guided on the top of the first side roll, in particular with contact to the top of the first side roll, before it is guided between the underside of the top roll and the top of the bottom roll. The first side roller can support the sheet metal so that undesirable deformation is avoided. In step b), the top side of the first side roll and the top side of the bottom roll are preferably arranged in the plane in which the sheet metal is fed to the bending device.

In a further preferred embodiment of the method, the upper roller and/or the lower roller of the bending device are adjusted between steps a) and b).

In the method described, the bending device is tilted after the first section of the sheet has been bent and before the second section of the sheet is bent. Tilting the bending device generally also changes the positions of the rollers. This can lead to a force being applied to the sheet metal, which deforms the sheet metal. However, it is preferred that the sheet metal is not deformed by tilting the bending device between steps a) and b). The inlet of the sheet metal preferably remains straight, in particular horizontally, despite the tilting of the bending device. In the present embodiment, this is achieved in that the lower roller and/or the upper roller are adjusted. As a result, the tilting of the bending device can be compensated for to the extent that a gap between the lower roller and the upper roller remains at a constant height.

It is possible for both the bottom roller and the top roller to be adjustable. However, a simpler embodiment is one in which the upper roller is adjustable and the lower roller is non-adjustable or in which the lower roller is adjustable and the upper roller is non-adjustable. The latter is particularly preferred. In this case, it is preferred that the top roller in the first orientation is held at a height which is higher than a height of a top side of the sheet when entering the bending device. By tilting the bending device into its first orientation, the top roller is lowered and thus comes into contact with the surface of the sheet. The first section can be bent in step a). In step b), the sheet comes into contact with the top roll by the sheet being pressed upwards by the first side roll and/or the second side roll.

Preferably, the first side roller is also adjusted between steps a) and b), in particular simultaneously with the tilting of the bending device. The first side roller is particularly preferably delivered to the sheet metal between steps a) and b). This allows the inlet of the sheet to remain straight and the bending force can be applied mainly by the first side roll and the bottom roll.

• - eine Biegeeinrichtung, und
• - eine Zuführeinrichtung, welche dazu eingerichtet ist, das Blech entlang einer Zuführrichtung der Biegeeinrichtung zuzuführen,

wobei die Biegeeinrichtung relativ zur Zuführrichtung verkippbar ist.As a further aspect of the invention, a device for bending a sheet metal into a piece of pipe is presented. The device includes:

• - a bending device, and
• - a feed device which is set up to feed the sheet metal along a feed direction of the bending device,

wherein the bending device can be tilted relative to the feed direction.

The advantages and features of the method are applicable and transferable to the device, and vice versa. The device is preferably set up to operate according to the method. The method is preferably carried out using the device.

The bending device can be tilted between its first orientation and its second orientation relative to the feed direction. This means that the bending device can in any case be tilted between the first orientation and the second orientation. In addition, it is not necessary that the bending device can be tilted. Accordingly, it is preferred that the bending device can be tilted between its first orientation and its second orientation relative to the feed direction, but cannot be tilted beyond the first orientation and/or beyond the second orientation. This can be achieved, for example, by a respective stop.

The bending device can preferably be tilted from its basic orientation up to a maximum tilted orientation, in particular continuously. Depending on the sheet thickness, a first orientation and a second orientation can be selected for the process, which are between between the basic orientation and the maximum tilted orientation. The second orientation is preferably always the basic orientation.

In order to enable tilting, the device can, for example, have a two-part frame. A first part of the frame can be held rotationally fixed on the bending device and a second part of the frame can be held rotationally fixed relative to the rest of the device. For example, the second part of the frame can be held in a rotationally fixed manner on a foundation of the device. A floor of a factory hall is particularly suitable as the foundation of the device. The two parts of the frame are preferably rotatably mounted against each other via an axis. In this respect, the bending device can be rotated around the axis. This can be done, for example, with one or more hydraulic cylinders. The hydraulic cylinders can be held, for example, on the first part of the frame and on the second part of the frame. Alternatively or additionally, the hydraulic cylinders can be held on the first part of the frame and on the foundation of the device. The hydraulic cylinders are preferably position-controlled. The hydraulic cylinders can absorb the forces that occur during bending and keep the bending device constantly in the desired orientation despite these forces.

In general, it is preferred that the device has a foundation on which the bending device is mounted so that it can be tilted. Such a design is primarily useful for large and heavy sheets.

The bending device is preferably designed as a round bending machine. The bending device preferably has a first side roll, a second side roll, a lower roll and/or an upper roll. The “and” case is preferred. The rollers each have an axis, which is preferably aligned parallel to the plane in which the sheet metal is fed to the bending device. The axes of the rollers are preferably perpendicular to the feed direction. The axes of the rollers are preferably aligned parallel to one another. Preferably, at least one of the rollers of the bending device is driven, for example the upper roller and/or the lower roller.

In the second orientation of the bending device, the upper roller and the lower roller are preferably arranged one above the other. A connecting line between an axis of the upper roller and an axis of the lower roller is preferably perpendicular to the horizontal. The first side roller is preferably spaced from the lower roller and the upper roller in the opposite direction to the feed direction. The second side roller is preferably spaced from the lower roller and the upper roller in the feed direction. In the first orientation, the upper roller is preferably arranged laterally offset above the lower roller, in particular laterally offset against the feed direction.

In a preferred embodiment, the device further has a control device which is set up to control the device in such a way that a sheet metal is bent with the bending device according to a method designed as described.

The control device is preferably connected to the bending device in such a way that the control device can set bending parameters using appropriate control signals, for example the position of rollers of the bending device, pressures and forces generated. In addition, the control device is preferably connected to the bending device and/or to the feed device in such a way that the control device can use appropriate control signals to control when and how quickly the sheet metal is fed to the bending device. Furthermore, the control device is preferably connected to the bending device and/or a tilting element of the device in such a way that the control device can control the orientation in which the bending device is located via corresponding control signals. In addition, the control device is preferably connected to one or more sensors, from which the control device receives corresponding measurement signals relating to the bending parameters, the position of the sheet and/or the orientation of the bending device.

1. A) Biegen mehrerer Bleche zu einem jeweiligen Rohrstück gemäß einem wie beschrieben ausgestalteten Verfahren,
2. B) Zusammensetzen der gemäß Schritt A) erhaltenen Rohrstücke zu dem Pfahl.

As a further aspect of the invention, a method for producing a pile for a wind turbine is presented. The procedure includes:

1. A) bending several sheets of metal into a respective piece of pipe according to a method designed as described,
2. B) Assembling the pipe pieces obtained according to step A) to form the pile.

• 1: eine erfindungsgemäße Vorrichtung zum Biegen eines Blechs zu einem Rohrstück,
• 2a bis 2f: Visualisierungen eines erfindungsgemäßen Verfahrens zum Biegen eines Blechs zu einem Rohrstück mit der Vorrichtung aus 1,
• 3: eine Windenergieanlage mit einem Pfahl, der nach einem erfindungsgemäßen Verfahren hergestellt wurde.

The advantages and features of the method for bending a sheet of metal into a piece of pipe and the device are applicable and transferable to the method for producing a pile for a wind turbine, and vice versa. The wind turbine is preferably an offshore wind turbine. However, it is also conceivable that the wind turbine is an onshore wind turbine. The pile can be a monopile for a wind turbine. However, it is also conceivable that the pile is used as one of several piles of a wind turbine. The invention is explained in more detail below with reference to the figures. The figures show a particularly preferred exemplary embodiment, to which the invention is, however, not limited. The figures and the proportions shown therein are only schematic. Show it:

• 1 : a device according to the invention for bending a sheet of metal into a piece of pipe,
• 2a until 2f : Visualizations of a method according to the invention for bending a sheet of metal into a piece of pipe with the device 1 ,
• 3 : a wind turbine with a pile that was produced using a method according to the invention.

1 shows a device 1 for bending a sheet 5 into a pipe piece 8 (which in 2f is shown). The device 1 comprises a bending device 2 and a feed device 3, which is set up to feed the sheet 5 to the bending device 2 along a feed direction r. In the example shown, the feed device 3 has a three-part roller table 23. The bending device 2 can be tilted between a first orientation 9 and in a second orientation 10 relative to the feed direction r. For this purpose, the bending device 2 is rotatably mounted about an axis 24. In order to tilt the bending device 2 between its first orientation 9 and its second orientation 10, the bending device 2 has two hydraulic cylinders 21, 22. In 1 the bending device 2 is shown in its second orientation 10. The second orientation 10 can be referred to as a basic orientation in which the bending device 2 is not tilted, for example, relative to the floor of a factory hall.

The bending device 2 has a first side roller 11, a second side roller 13, an upper roller 15 and a lower roller 17. The sheet 5 can be bent by exerting a bending moment on the sheet 5 with these rollers 11, 13, 15, 17. For this purpose, the sheet metal 5 can be guided on an upper side 12 of the first side roller 11, on an upper side 14 of the second side roller 13, on an underside 16 of the upper roller 15 and/or on an upper side 18 of the lower roller 17.

Furthermore, the device 1 has a control device 4. The control device 4 is set up to control the device 1 in such a way that a sheet metal 5 is bent into a pipe piece 8 with the bending device 2.

1. a) Biegen eines ersten Abschnitts 6 des Blechs 5,
2. b) Biegen eines zweiten Abschnitts 7 des Blechs 5.

The 2a until 2f visualize the procedure used. They show this 2a until 2f each a section of the device 1 1 at different times. The procedure includes the following steps, which are carried out sequentially in the specified order:

1. a) bending a first section 6 of the sheet 5,
2. b) Bending a second section 7 of the sheet 5.

In steps a) and b), the sheet metal 5 is fed to the bending device 2 along the feed direction r.

2a shows that the bending device 2 as indicated by a curved arrow in comparison to 1 is tilted from its second orientation 10 into its first orientation 9 counter to the feed direction r. In the figures, the bending device 2 is tilted clockwise in its first orientation 9 compared to its second orientation 10.

• - an der Oberseite 12 der ersten Seitenwalze 11,
• - an der Unterseite 16 der Oberwalze 15 und
• - an der Oberseite 18 der Unterwalze 17

geführt wird. Die Oberwalze 15 und die Unterwalze 17 sind dabei wie durch einen jeweiligen gebogenen Pfeil angedeutet angetrieben. 2 B shows bending according to step a). The bending device 2 is held in its first orientation 9. In step a), the first section 6 of the sheet 5 is bent by moving the sheet 5 along the feed direction r in the specified order

• - on the top 12 of the first side roller 11,
• - on the underside 16 of the top roller 15 and
• - on the top 18 of the lower roller 17

to be led. The upper roller 15 and the lower roller 17 are driven as indicated by a respective curved arrow.

2c also shows step a). The sheet metal 5 has already advanced so far into the bending device 2 that the sheet metal 5 is additionally guided to the top side 18 of the lower roller 17 on the top side 14 of the second side roller 13.

2d shows how the bending device 2 is tilted from its first orientation 9 into its second orientation 10 between steps a) and b). The first side roller 11, the second side roller 13, the upper roller 15 and/or the lower roller 17 are adjusted so that the sheet 5 is still guided by these rollers 11, 13, 15, 17.

• - zwischen der Unterseite 16 der Oberwalze 15 und der Oberseite 18 der Unterwalze 17 und
• - an der Oberseite 14 der zweiten Seitenwalze 13

geführt wird. 2e shows bending according to step b). The bending device 2 is held in its second orientation 10. In step b), the second section 7 of the sheet 5 is bent by moving the sheet 5 along the feed direction r in the specified order

• - between the bottom 16 of the top roller 15 and the top 18 of the bottom roller 17 and
• - on the top 14 of the second side roller 13

to be led.

2f shows the completion of the procedure. The sheet metal 5 is present as a piece of pipe 8. The remaining gap between the two ends of the sheet 5 can then be closed, for example by welding, so that a circumferentially closed pipe piece 8 is obtained.

1. A) Biegen mehrerer Bleche 5 zu einem jeweiligen Rohrstück 8 gemäß dem Verfahren nach den 2a bis 2f,
2. B) Zusammensetzen der gemäß Schritt A) erhaltenen Rohrstücke 8 zu dem Pfahl 20.

3 shows a wind turbine 19 with a pole 20. A nacelle 26 with a rotor 25 is held on the pole 20. The pile 20 has, for example, three pipe pieces 8, each using the method from the 2a until 2f were manufactured. The pile 20 was therefore manufactured using a process which includes:

1. A) Bending several sheets 5 into a respective piece of pipe 8 according to the method according to 2a until 2f ,
2. B) Assembling the pipe pieces 8 obtained according to step A) to form the pile 20.

Reference symbol list

1

contraption

2

Bending device

3

Feeding device

4

Control device

5

sheet

6

first section

7

second part

8th

piece of pipe

9

first orientation

10

second orientation

11

first side roller

12

Top

13

second side roller

14

Top

15

Top roller

16

bottom

17

bottom roller

18

Top

19

Wind turbine

20

stake

21

first hydraulic cylinder

22

second hydraulic cylinder

23

Roller table

24

axis

25

rotor

26

gondola

r

feed direction

Claims (8)

Method for bending a sheet of metal (5) into a pipe piece (8) using a round bending machine (2), the method comprising the following steps, which are carried out one after the other in the specified order: a) bending a first section (6) of the sheet (5), b) bending a second section (7) of the sheet (5), the sheet (5) being fed to the bending device (2) along a feed direction (r) in steps a) and b), the round bending machine (2) in Step a) is held in a first orientation (9) relative to the feed direction (r), and in step b) the round bending machine (2) is held in a second orientation (10) relative to the feed direction (r) which is different from the first orientation (9). ) is held. Procedure according to Claim 1 , wherein the round bending machine (2) is tilted in its first orientation (9) relative to its second orientation (10) against the feed direction (r). Method according to one of the preceding claims, wherein the sheet (5) in step a) is bent by moving the sheet (5) along the feed direction (r) in the specified order - on a top side (12) of a first side roller (11) of the round bending machine (2), - on an underside (16) of an upper roller (15) of the round bending machine (2) and - is guided on an upper side (18) of a lower roller (17) of the round bending machine (2). Method according to one of the preceding claims, wherein the sheet (5) is bent in step b) by feeding the sheet (5) along the feed direction (r) in the specified order - between an underside (16) of an upper roll (15) of the round bending machine (2) and an upper side (18) of a lower roll (17) of the round bending machine (2) and - Is guided on a top side (14) of a second side roller (13) of the round bending machine (2). Procedure according to one of the Claims 3 or 4 , wherein the upper roller (15) and / or the lower roller (17) of the round bending machine (2) are adjusted between steps a) and b). Device (1) for bending a sheet (5) into a pipe piece (8), comprising: - a round bending machine (2), and - a feed device (3), which is set up to feed the sheet (5) along a feed direction (r ) to the round bending machine (2), the round bending machine (2) being tiltable relative to the feed direction (r). Device (1) according to Claim 6 , further comprising a control device (4), which is set up to control the device (1) in such a way that a sheet metal (5) is produced using the round bending machine (2) according to a method according to one of Claims 1 until 5 is bent into a piece of pipe (8). Method for producing a pile (20) for a wind turbine (19), comprising: A) bending several sheets (5) into a respective pipe section (8) according to a method according to one of Claims 1 until 5 , B) Assembling the pipe pieces (8) obtained according to step A) to form the pile (20).

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