WO2013091973A1

WO2013091973A1 - Modular pipe welding device and method for producing a pipe

Info

Publication number: WO2013091973A1
Application number: PCT/EP2012/071815
Authority: WO
Inventors: Uwe Flitsch; Daniel Hiller; Carlo Burkhardt; Bernhard Heil; Uwe Bauer; André PRAUS; Eugen Dietrich; Marc Wawra
Original assignee: Witzenmann Gmbh
Priority date: 2011-12-20
Filing date: 2012-11-05
Publication date: 2013-06-27
Also published as: DE102011089208A1

Abstract

The invention relates to a modular pipe welding device (1) for producing pipes with a sequence of tool holders and a corresponding method in which, in the following sequence, at least one bending roller module (2), at least one plastic shaping module (3) at least one burnishing roller pair module (4) and a welding module (5) are arranged between the tool holders with variable spacing and are used accordingly in pipe production.

Description

Modular pipe welding apparatus and method of making a pipe

description

The present invention relates to a (nodular pipe welding apparatus according to the preamble of claim 1 for the production of pipes, in particular continuously longitudinally welded pipes, with a sequence of tool holders.

Such a modular pipe welding apparatus comprises first of all the tool holders already mentioned, which are also referred to as "machine-side tool holders." A replaceable mold tool set is received in said tool holders, by means of which the tube forming is realized in a continuous sequence.

Furthermore, the present invention relates to a method according to the preamble of claim 10 for producing a tube, in particular a continuous lieh longitudinally welded tube, with a pipe welding device according to the invention.

From the prior art, the production of pipes in a web mold channel with 8 to 10 fixed plastic mold stages, fully enclosing, ie sleeve-like welding bushings and a Rohr calibration by a Innenziehziehing known. However, such web-forming channels have a number of disadvantages. So the bandwidth in the manufacturing process must be readjusted because the weld bushes wear out. Replacing the weld bushes is time consuming and the weld bushes themselves are relatively expensive to manufacture, which negatively impacts the overall cost. Due to the process, a roof-shaped tube geometry is regularly created for the weld seam, which necessitates the use of an internal calibration ring (also called draw ring). This, in turn, requires the use of squeezers, leaving an oil film on the inside of the pipe. In multi-layered components, it can in later operation at high temperature impact for Evaporation of this oil film come, which leads in particular to so-called "Blähbälgen" and thus to a component failure.

In the case of the abovementioned previously known web forming channels, all of the shaping steps can be adjusted or adjusted in the vertical and horizontal position, which, however, leads to a high degree of influence on the worker. Disadvantageously, there are no definable or reproducible adjustment parameters.

Also known are rollforming channels with 5 to 13 fixed roller stands, welding rollers and tube calibration by an inner pull ring or an external calibration.

Furthermore, hybrid channels with two roller stands, four to six stationary plastic mold stages, fin skeleton, weld bushing and pipe calibration by internal or external calibration are known.

The known Rollformkanäle and hybrid channels have the disadvantage that they are very expensive to purchase and have a large footprint in the length (about fifty times the diameter of the tube to be produced). In addition, only limited different thicknesses can be processed, and for wrinkle-free tube forming often position corrections of the steps are necessary.

Another disadvantage of the known devices for the production of pipes is that the production speed is limited to about 5 m / min due to the use of a (inner) Ziehrings.

The object of the invention is therefore to avoid disadvantages of the known from the prior art manufacturing processes of (metal) pipes and to allow a faster, easier and more cost-effective pipe production.

The object of the present invention is achieved by a modular tube welding device of the type described above, in which, in the following order in the tool holders at least one Anbiegerollenmodul, at least one plastic mold module, at least one Finnrollenpaarmodul and a welding module in a between the respective tool holders are arranged variably adjustable distance. Due to the variable arrangement of the tool holders, the modular tube welding device can be easily changed and thus, for example in a product change, adapted to new requirements (eg to a changed Distance between the tool holders or to a changed number of tool holders.) For variable arrangement, the machine table on which the pipe welding device is mounted can have a rail system or it is designed as a perforated plate.

The modular tool design of the pipe welding device also has the advantage that a quick change of the individual sets of mold sets is possible. The mold sets can be designed to be very cost-effective as a simple plug-in cassette system, wherein the cassette system comprises in particular plug-in Anbiegerollen, block-shaped and plug-in plastic mold stages and plug-in Finnrollen. The Anbiegerollenmodul preferably has two Anbiegerollen, the axes of the Anbiegeroflen arranged parallel to each other and in their distance, that are vertically adjustable, whereby different strip thicknesses can be edited. The Anbiegerollenmodul or Anbiegerollenpaar preferably comprises an upper roller and a sub-roller, wherein at least one of the two rollers, for example, the top hat, most preferably in several parts, particularly preferably in three parts, is formed, that includes a plurality of individual (sub) roles, one behind the other on a common Arranged axis, preferably mounted on a common axis. As a result of this multi-part design of at least one of the two rolls, it is possible to produce equal roll spacings even in the case of changing (metal) strip thickness both in the middle and in the edge region of the strip. This increases the quality of the bending process of Endradien, which is crucial for how well or with what additional effort afterwards the tube is malleable, so this has no seam shape at the seam but a clean rounding. According to a preferred embodiment of the invention, the pipe welding device, in particular in connection with the described multi-part design of a roller of the Anbiegerollenmoduls in the welding module on a welding shoe instead of a circumferentially closed welding bush. Such a welding shoe encloses the tube in the region of the seam only partially and is designed as a welding tool significantly smaller and cheaper than a previously known weld bushing.

Through the use of a Anbiegerolfenmoduls with multi-part executed role a roof-shaped design of the tube geometry can be avoided, whereby the necessary according to the prior art use of a Innenzieh- rings and lubricant for pipe calibration deleted. By such an oil-free pipe production, the risk of the occurrence of "Blähbälgen" can be eliminated.

The welding module preferably has a welding shoe holder, wherein the welding shoe holder or the welding shoe is equipped with or is in operative connection with a force sensor. With the force sensor, the contact pressure of the welding shoe on the edge of the strip edge is detected and can be used accordingly control technology, especially in the positioning of the welding shoe. Such adjustability is not given in a weld bushing.

The plastic mold module preferably has plastic mold stages which are mounted on compression springs. The plastic mold stages are mounted vertically floating, preferably in lateral support frame with U-shaped cross-section or on at least two round guide columns. In this case, the solid Bandmateriai positioned the mold stages vertically by its residual stress, so that no additional stresses or strains on the strip material act through the molding stage. As a result, an optimal gentle tube forming is achieved, and kinks in the strip material are avoided. Another advantage of this embodiment is that this reduces the influence of the worker, because the plastic mold stages do not have to be preset in the vertical direction. The compression springs compensate advantageously just the weight of the mold stages. The use of six such floating plastic mold stages or plastic mold modules has proven particularly suitable.

The Finnrollenpaarmodul preferably has a tool holder for the Finnrollen, which includes the tool holder highly preferably two vertically adjustable carriages with parallel thru axles on which the Finnrollen are mounted on the fly. Due to the vertical delivery possibility due to the vertically movable carriages, the strip edges can be optima! be applied to the fin, whereby a stable band edge run is achieved. Due to the fact that the Finnrollenpaare be moved vertically to each other to adjust the distance of the (plug) axes, a diameter range of preferably ± 1, 5 mm can be covered.

The use of only a single Finnrollen- pair module has proven particularly suitable.

Furthermore, the object of the present invention is achieved by a method for producing a pipe with a pipe welding device according to the invention, in which a (metal) strip material is used as starting material, wherein the strip material is guided through at least one bending roll module (whereby the strip material is bent) , is then preformed in at least one plastic mold module, then molded in at least one Finnrollen- paarmodul, and its band edges then in a

Schweißmodu! welded together and thus positively connected to the pipe. Such a method enables gentle, wrinkle-free tube forming. The defined setting parameters reduce the influence of the worker and increase process stability.

As a starting material! In continuous longitudinal seam welding, a (metal) strip material is preferably used. According to the state of the art, when changing the welding bushing (for example when fitting the outer pipe to the inner pipe in the case of a two-layer product), the pipe must be cut in line in order to change the welding bushing. This is no longer necessary with the inventive method in which a welding shoe can be used, whereby the effort is reduced and the setup time is shortened. In the following the invention will be described in more detail with reference to figures. 2 shows a perspective view of a Anbiegerollenmoduls the pipe welding device according to the invention, Figure 3 is a perspective view of a welding module of the pipe welding device according to the invention and Figure 4 is a perspective view of a plastic mold module of the pipe welding device according to the invention.

Figure 1 shows an embodiment of the pipe welding device 1 according to the invention with two Anbiegerollenmodulen 2, three plastic mold modules 3, two Finnrollenpaarmodulen 4 and a welding module 5, which form the tool holders of the tube welding device 1.

The tool holders of the pipe welding device 1 are machine-bound and not product-specific. The tool holders are mounted on a, not shown in the figure 1, machine table. The machine table is designed such that the distance of the tool holders to each other, depending on the desired pipe dimensions, can be adjusted on the machine table.

The Anbiegerollenpaare 6 of Anbiegerollenmodule 2 are moved vertically to each other. The tool holders for the Anbiegerollen consist of two vertically adjustable slide 7-1 with parallel thru axles 8-1, on which the Anbiegerollen are mounted.

The tool holders for the plastic mold stages 9 in the plastic mold modules 3 have compression springs 10, which are arranged in pairs in U-shaped profile frames 3 a, which profile frames 3 a are used as guides for plastic molds. 9 form steps to equalize the weight of the plastic mold stages 9, thereby enabling a floating storage.

The Finnroilenpaarmodule 4 have tool holders for the Finnrollen 1 1, consisting of two vertically adjustable slide 7-2 with parallel thru axles 8-2, on soft the Finnrollen 1 1 are mounted.

The tool holder for the welding shoe has a vertically adjustable slide 7-3 with welding shoe holder 8-3, on which the welding shoe 13 is mounted. The Schweißschuhaufnahme 8-3 is equipped with a, not shown in the figure 1, force sensor, whereby the contact pressure of the welding shoe 1 3 can be detected on the band edge impact. The welding shoe 13 itself is shown in more detail in FIG. Preferably, it does not completely surround the tube, as appears to be apparent from FIG.

The pipe welding device 1 according to the invention has a modular structure, whereby the number and / or the distances between the tool holders, namely the Anbiegerollenmodulen 2, plastic mold modules 3, Finnrollen- paarmodulen 4 and the welding module 5, can be varied. In a product change the tool set, for example, the Anbiegeroilen on the thru axles 8-1, the plastic stages 9, the Finnrollen 1 1 and / or the welding shoe, replaced.

Figure 2 shows a section of the Anbiegerollenmodul 2 with two slides 7-1 with thru axles 8-1, where a Oberrolie 14 and a lower roller 15 are arranged.

The upper roller 14 is designed in three parts and consists in the example shown of three side by side mounted on a thru axle 8-1 sub-rollers 14a, 14b, 14c. The Anbiegerollen 14, 15 are mounted on the aforementioned thru axles 8-1 flying and can be quickly replaced when changing the product. In addition, the bending rollers 14, 15 via a right-left spindle 17 by means of the carriage 7-1 in the vertical direction to each other movable. FIG. 3 shows the welding module 5. In detail, FIG. 3 shows a welding shoe holder 8-3 and a welding shoe 13 with a force sensor, which is not explicitly shown, which can forward measured data to a display 19 via a connection 18. The connection 18 may be a cable but also a wireless connection, such as a WLAN or Bluetooth connection. However, the measured data measured at the welding shoe holder 8-3 or at the welding shoe 13 can also be forwarded to a computer, not shown in FIG. 3, which controls the pipe welding device 1.

The welding shoe 13 consists of at least one partial shell, which brings the strip edges 24a, b of the metal strip 24 together to form a joint, so that they can be welded. The welding can be done for example by laser welding or other welding methods known in the art. Unlike prior art weld bushings, the welding shoe 13 only covers a small part of the circumference of the metal strip 24 formed into a pipe.

The Schweißschuhaufnahme 8-3 is connected to a carriage 7-3, which has a receptacle 20 for a continuous spool, not shown in Figure 3! to vertically adjust the carriage 7-3 within the welding module 5, in particular in accordance with the force sensor measurement data. The carriage 7-3 is thus movable in the vertical direction via said through-spindle in order to adjust the position and contact pressure of the welding shoe 13 to the edge impact in accordance with the force sensor measurement data.

Figure 4 shows a single plastic mold module 3 with a base plate 21 and arranged perpendicular to the base plate 21 Rundführungssäuien 22. To the circular guide columns 22 each have a compression spring 10 is arranged. The Rundführungssäuien 22 with the compression springs 10 ensure that a provided with two holes corresponding plastic molding stage 9 is floatingly mounted on the guide rails 22. Such storage of the plastic molding stage 9 on the round guide columns 22 also allows a quick change of the plastic molding stage 9, for example, in a product change. On the profile frame shown in Figure 1 was omitted in the embodiment of Figure 4. The lateral guidance takes place here by means of the round guide columns 22.

The plastic molding stage 9 has a recess 23 through which the (Metal) band (see Figure 3) and thereby formed stepwise to the tube. In the case of a plurality of plastic mold modules 3 arranged one behind the other, the shape of the recess 23 gradually changes more and more from a slightly curved to a volumically closed circular shape, as can be seen in FIG.

LIST OF REFERENCES: 1 pipe welding device

2 bending roller module

3 plastic mold module

3a profile frame

4 Finned roll pair module

5 welding module

6 bending roller pair

7-1 slide (bending roll module!)

7-2 carriage (Finnrollenpaarmodul)

7-3 sledge (welding shoe)

8-1 thru axle (bending roller module)

8-2 thru axle (Finnrollenpaarmodul)

8-3 welding shoe holder

9 plastic molding

10 compression spring

11 Finn roll

13 welding shoe

14 upper role

15 sub-roll

17 right-left spindle

18 connection

19 display

20 recording

21 base plate

22 round guide column

23 recess

24 band

24a band edge

24b Bahd edge

Claims

claims

1 . Modular pipe welding device (1) for producing pipes with a sequence of tool holders, characterized in that in the tool holders in the following order

at least one bending roll module (2),

at least one plastic mold module (3),

- At least one Finnrollenpaarmodul (4) and

- a welding module (5)

are arranged in a variable between the tool holders distance,

2. pipe welding device (1) according to claim 1, characterized in that the Anbiegerollenmodul (2) has a pair (6) Anbiegerollen, wherein the axes of the Anbiegerollen are mutually vertically adjustable,

3. tube welding device (1) according to claim 1 or 2, characterized in that the Anbiegerollenmodul (2) comprises an upper roller (14} and a lower roller (15), wherein at least one of the rollers, preferably the upper roller (14), is formed in several parts , Most preferably with side by side on a roller axle arranged sub-rollers (14a-c).

4. pipe welding apparatus (1) according to claim 3, characterized in that the roller axle as a plug-in axis (8- 1) is formed, on which the rollers (14, 1 5) and / or part rollers (14a-c) are placed.

5. pipe welding device (1) according to claim 3 or 4, characterized in that at least one of the rollers (14, 15), preferably the upper roller (14), at least in three parts (14 a-c) is formed,

6. tube welding device (1) according to one of claims 1 to 5, characterized in that the welding module (5) has a welding shoe (1 3), which welding shoe (13) preferably in the Finnrollenpaarmodul (4) preformed tube (24) partially contacted ,

7. tube welding device (1) according to claim 6, characterized in that the welding module (5) has a Schweißschuhaufnahme (8-3), wherein the Schweißschuhaufnahme (8-3) or the welding shoe (13) is equipped with a force sensor whose force measurement data preferably for controlling the welding module (5) are used.

8. tube welding device (1) according to one of claims 1 to 7, characterized in that the plastic mold module (3) plastic molding stages (9) which are mounted on compression springs (10).

9. pipe welding device (1) according to claim 8, characterized in that the plastic mold stages (9) are floating on the compression springs (1 0) are mounted.

10. pipe welding device (1) according to one of claims 1 to 9, characterized in that the Finnrollen (1 1) in the Finnrollenpaarmodul (4) are arranged in pairs vertically above one another and with parallel roller axes.

1 1. Pipe welding device (1) according to claim 10, characterized in that the roller axes are designed as plug-in axles (8-2) and that the Finnrollen (1 1) are mounted on the fly-axles (8-2) flying.

12. pipe welding device (1) according to one of claims 1 to 1 1, characterized in that the Finnrollenpaarmodul (4) has a tool holder for the Finnrollen (1 1), wherein the tool Aufnähme the Finnrollen (1 1) of the Finnrollenpaarmoduls (4) consist of two vertically adjustable chutes (7-2) with thru axles (8-2) on which the Finnrollen (1 1) are preferably mounted on the fly.

1 3. A method for producing a pipe with a tube welding device (1) according to one of the preceding claims, characterized in that a strip material (24) is used as the starting material, wherein the strip material (24) by at least one Anbiegerollenmodul (2) is guided , is preformed in at least one plastic mold module (3) and is formed in at least one Finnrollenpaarmodul (4), whose ßandkanten (24a, b) are then connected in a weld module (5) cohesively with each other.