Internal pipe deburrer and method for operating an internal pipe deburrer of this kind
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SMS GROUP GMBH
- Filing Date
- 2025-12-09
- Publication Date
- 2026-08-06
Smart Images
Figure EP2025086129_06082026_PF_FP_ABST
Abstract
Description
[0001] Internal pipe deburring device and method for operating such an internal pipe deburring device
[0002] 1. Field of the invention
[0003] The invention relates to internal pipe deburring devices for the internal deburring of longitudinally welded pipes, a method for operating such an internal pipe deburring device, and the use of an internal pipe deburring device for removing weld seams on the inside of longitudinally welded pipes, in particular pipes with an internal pipe diameter of less than 300 mm and a wall thickness of more than 2 mm.
[0004] 2. State of the art
[0005] In the production of longitudinally welded tubes, a flat metal strip is typically fed continuously into a forming machine and processed into a round slotted tube. This slotted tube is then continuously processed into a longitudinally welded tube using a suitable welding device. The welding device usually induces an external voltage, which, directed appropriately onto the contacting edges of the slotted tube, provides the energy required to weld the adjoining edges. The welding process creates a weld seam that typically protrudes on both the outside and the inside contour of the tube and must be removed to ensure a smooth and uniform surface both inside and outside the tube.The present invention relates to the internal deburring of longitudinally welded pipes, thus to the removal of the parts of the weld seam that protrude on the inner contour, the so-called weld bead, hereinafter generally referred to as "weld seam".
[0006] Page 1. The removal of this weld seam from the inner contour of the pipe is usually carried out immediately after the weld is formed and before the material molten during welding has completely cooled. In this state, the weld seam typically has a doughy consistency, which facilitates removal using a planer acting longitudinally along the weld seam. This is all usually done in a continuous process in which the internal deburrer remains permanently inside the continuously manufactured longitudinally welded pipe. Maintenance work, such as the replacement of planer or chipper blades or ferrites installed in the internal pipe deburrers, is usually carried out by opening the side wall of a pipe to allow access and replacement, as inserting and aligning the internal deburrer inside the pipe is complex and time-consuming.
[0007] The currently used internal pipe deburring tools and their associated scraper bars are inserted into the interior of a formed sheet metal part and perform the deburring function almost immediately after the longitudinal pipe seam has been welded. On one side, the internal pipe deburring tool, by means of an impedance holder, serves as a carrier for the ferrite core required for the welding process, which ensures the precise alignment of the externally applied magnetic field for welding. On the other side, the internal pipe deburring tool, with its scraper bar, serves as a carrier for the deburring device required for the deburring process, including its planing blade.
[0008] When removing or lifting the weld from the inside of the welded pipe, a continuous raised weld bead is formed due to the continuous welding and deburring process. Without appropriate further processing, in particular cutting or flushing out weld remnants, this would accumulate inside the deburred pipe and hinder the deburring process. Ultimately, this led to
[0009] Page 2: Damage to the planer blade used to remove the weld seam would significantly hinder the deburring process and result in a deburring result that no longer meets quality requirements. Therefore, prior art has already incorporated measures to break up the weld seam protruding from the inner pipe wall and removed by a planer blade. These measures include, for example, the use of serrated wheels, which divide the weld seam into small sections before it is removed from the inner pipe wall, or the use of chipping devices with movable chipping blades, which divide the continuously removed weld seam into suitable sections after it has been lifted from the inner pipe wall. The necessary force and movement are typically provided by a hydraulic cylinder.
[0010] However, for smaller pipe diameters with an inner diameter below 300 mm and a wall thickness above 10 mm, the deburring results achieved with current technology are unsatisfactory. One problem is that the weld seam is not reliably and consistently removed, and the weld seam fragments cannot be removed as desired, negatively impacting the quality of the pipe's inner wall. This is due, in part, to the insufficient force applied by the hydraulic cylinder for all cutting edge and weld seam geometries, the insufficient chopping frequency, and the unavoidable vibrations that occur during operation of the pipe deburrer, which can lead to uneven cutting results or inconsistent cutting depths from the planer blade.
[0011] Achieving greater cylinder force using a larger hydraulic cylinder is not feasible due to space constraints, particularly with pipes that have a small inner diameter and large wall thickness. Furthermore, a larger hydraulic cylinder also requires a higher oil flow rate.
[0012] Page 3, however, which is limited by the restricted cross-section and flow velocities in the designated supply and discharge lines, the length of the supply lines, and the size of the valves. All of this leads to a reduction in the achievable stroke frequency of the chipper blade, with negative consequences for the weld seam lengths after exiting the chipper blade. Another problem with the internal deburring of small-diameter, thick-walled pipes is that the installation space of the internal pipe deburrer is necessarily limited, and its mechanical rigidity is restricted. The contact forces required for the chipper blade against the inner pipe wall for a satisfactory deburring process therefore easily lead to deflection of the internal pipe deburrer and / or its components, making it difficult to reliably and precisely position the chipper blade against the inner contour of the pipe to be deburred.
[0013] 3. Object of the invention
[0014] It was therefore an object of the invention to provide an internal pipe deburrer and a method for operating such an internal pipe deburrer that are capable of overcoming the problems known from the prior art and of reliably and smoothly lifting a weld seam from the inner contour of a longitudinally welded pipe. This object is achieved according to the invention with an internal pipe deburrer comprising the features of claim 1, a method comprising the features of claim 13, and finally also with the use according to the invention of such an internal pipe deburrer comprising the features of claim 18. Advantageous embodiments are set forth in particular in the dependent claims.
[0015] Page 44. Summary of the invention
[0016] According to the invention, in a first aspect of the invention, an internal pipe deburrer for internal deburring of longitudinally welded pipes is provided, which has at least one planing knife for lifting a weld seam, at least one chopper knife for chopping the weld seam lifted by the planing knife, and a drive for moving the chopper knife relative to the lifted weld seam.
[0017] As mentioned at the outset, in the sense of the invention, the weld seam is understood to be the weld bead protruding beyond the inner wall of the pipe, which must be planed or lifted off by the pipe deburrer.
[0018] According to the invention, the planer blade and the chipper blade are mechanically decoupled from each other and housed in their respective support structures. During normal operation of the pipe deburrer, this mechanical decoupling is ensured by holding the respective support structures at a clear distance from each other of preferably up to 20 mm, preferably up to 15 mm, and particularly preferably up to 10 mm, measured when the support structures are aligned parallel to each other, within a scraper bar or scraper bar module. Any degrees of freedom that may exist during the movement of at least the support structure for the planer blade can lead to momentary contact between the support structures. However, this does not deviate from the principle of mechanical decoupling according to the invention.Once the planer blade, including its support structure, is correctly aligned with respect to the weld seam and performs the constant lifting process, the clear distance between the support structure for the planer blade on the one hand and the support structure for the chipper blade on the other hand is continuously present according to the invention, so that any vibrations on the.
[0019] Page 5: The planer blades are not directly transferred to the chipper blade, and conversely, vibrations from an oscillating movement of the chipper blade are not, or only to a minimal extent, directly transferred to the planer blade. This ensures reliable and trouble-free removal of the weld seam from the inner contour of longitudinally welded pipes.
[0020] The planer blade is typically rigidly and replaceably connected to its support structure, particularly integrated into it, and is positioned relative to the inner contour of the longitudinally welded pipe by suitable alignment. The support structure of the chipper blade, on the other hand, allows a preferably oscillating movement of the preferably integrated chipper blade around a rest position, preferably relative to a rigid and immobile chipper blade component, as well as relative to the weld seam lifted from the planer blade and guided towards the chipper blade, in order to perform at least one cutting operation, preferably two cutting operations, on the weld seam during a stroke and a return to the starting position.
[0021] In a preferred embodiment of the invention, the internal pipe deburrer consists of preferably interchangeable modules, comprising at least one blade for aligning the internal pipe deburrer with the weld seam, at least one impedance holder in which ferrites are enclosed, and at least one scraper bar module in which the unit of chipper blade and support structure and the unit of planer blade and its support structure are supported. Preferably, the modules are inserted into one another or assembled in a sleeve-like manner and are also lockable together. For the purposes of the invention, "sleeve-like insertion or assembly" means that the respective modules have a substantially identical cross-section at least at their mutually facing contact surfaces, forming a preferably positive-locking, and particularly preferably non-positive, connection.
[0022] Page 6 describes the force-fit, interlocking, and, if necessary, locking of the modules together. With a substantially round cross-section, at least of the contact surfaces of the modules, a coaxial alignment of two adjacent modules is provided. The connection of the modules is preferably achieved by sliding a contact area of a first module over a partial length of the contact area of the second module, thereby achieving surface support. It is also preferred that lines within the internal pipe deburrer, for both coolant and hydraulic fluids, can be aligned and leak-tightly connected to each other when the modules are connected.
[0023] Both the cutting edges of the planer blade and the chipper blade can be straight and, if necessary, perpendicular to the weld seam. However, an odd or angled orientation relative to the weld seam is preferred.
[0024] In a further preferred embodiment of the invention, the chipper blade has at least one opening with two opposing inclined, preferably arcuate and particularly semicircular, cutting edges. As already mentioned at the outset, the chipper blade can be moved within its support structure in a first stroke in a first direction and in an opposite stroke in a second direction. The weld seam, previously lifted from the planer blade, is guided through the opening within the chipper blade, allowing the cutting edges defining the opening within the chipper blade to each make a first cut during movement in the first direction and a second cut during return movement in the second direction. The inclined arrangement of the cutting edges within the chipper blade enables a clean cut to be made with the lowest possible forces acting on the chipper blade.It is particularly preferred if at least one opening inside the chopper blade is round and has a circumferential cutting edge.
[0025] This is provided for on page 7. This doubles the cutting frequency compared to chipper knives with a single cutting edge at the same stroke frequency of the chipper knife, while simultaneously simplifying the manufacturing of the chipper knife.
[0026] In a further preferred embodiment of the invention, the chipper blade is moved within its support structure and with respect to the weld seam lifted by the planer blade by means of a hydraulic drive, preferably actuated by a hydraulic cylinder. This provides a particularly simple and easily controllable system for the reliable movement of the chipper blade at a desired and, if necessary, variable frequency and with a desired and, if necessary, variable force input. It is particularly preferred in this context if the hydraulic drive, preferably the hydraulic cylinder, is arranged in alignment with the direction of movement of the chipper blade within the internal pipe deburrer.
[0027] In the context of the invention, "aligned" does not refer solely to a perfectly aligned arrangement, although this is preferred, but also includes minor deviations from a perfectly aligned arrangement with possible deviations of up to 20 mm, preferably up to 15 mm, and particularly preferably up to 10 mm in all spatial directions. This makes the power transmission from the hydraulic drive to the chipper blade particularly simple and avoids torque. Ultimately, this results in particularly low-vibration operation of the internal pipe deburrer according to the invention.
[0028] It is preferred that the chipper knife has a movable and oscillating component, and acts as described above, and an additional component rigidly fixed in the support structure, which together perform a shearing function on the weld passing through the chipper knife.
[0029] Page 8. In a further preferred embodiment of the invention, the support structure in which the planer blade is located has at least two guide rollers. By moving these rollers along the inner contour of the tube, thus perpendicular to the longitudinal orientation of the support structure, the planer blade can be positioned against the inner contour of the tube. The guide rollers are preferably arranged on both sides of the planer blade, and particularly preferably also on both sides of a tilting axis of the support structure described below, viewed in the longitudinal direction of the internal tube deburrer or the support structure for the planer blade. Especially with thin tubes, the cross-section and thus also the mechanical stiffness of the internal tube deburrer must be lower than with internal tube deburrers for processing the inner contour of tubes with a comparatively large inner diameter.By providing a suitable mounting for the support structure of the planer blade that can be tilted through a defined angular range, and simultaneously providing two copy rollers on both sides of the planer blade, viewed in the longitudinal direction of the internal pipe deburrer, a secure alignment of the planer blade with respect to the weld seam and the internal pipe contour can be ensured even if the internal pipe deburrer deflects due to the contact forces acting on the internal pipe deburrer.
[0030] In a further preferred embodiment of the invention, the support structure of the planer blade has at least one suspension, preferably on the sides of the support structure, for inserting the support structure into the scraper bar module. It is preferred if this suspension consists of two pins on opposite sides of the support structure aligned with the scraper bar module, which can be inserted into corresponding receptacles within the scraper bar module such that rotation about the axis of rotation formed by the receptacles is permitted at least over a limited angular range around a rest position. In this context, it is particularly preferred if the support structure of the planer blade can be rotated about a
[0031] Page 9Angle range of + / - 10°, preferably up to + / - 5°, particularly preferably up to + / - 2°, is tiltably arranged within the scraper rod module.
[0032] In this context, it is highly preferred if the support structure of the planer blade is designed and arranged in such a way that it only comes into contact with the support structure for the chipper blade when tilted around its rest position, in particular around its maximum intended rest position, and in every other case a distance between the support structures for the planer blade on the one hand and the chipper blade on the other hand is maintained throughout operation of the pipe deburrer.
[0033] Even if the internal pipe deburrer deflects due to the forces acting upon it, for example the pressure forces applied by a pressure roller in the scraper bar module, a tiltable mounting of the support structure for the planer blade around a tilting axis between two copy rollers and the provision of copy rollers on both sides of the planer blade and especially the tilting axis ensure that both copy rollers are still in contact with the inner contour of the pipe and that correct alignment of the planer blade with respect to the weld seam is ensured.
[0034] According to a second aspect of the present invention, a method for operating an internal pipe deburrer according to the first aspect of the invention is provided, the method being characterized in that a chipper blade located in the internal pipe deburrer oscillates from a rest position in a first direction of movement and, in a second direction of movement, chips a weld seam previously lifted by the planer blade. It is preferred in this context if the lifted weld seam is cut to length as it passes through an opening within the oscillating chipper blade.
[0035] Page 10. It is also preferred if the adjustment of the position of the support structure of the planer blade, and thus of the planer blade itself, to the inner wall of the tube is achieved by moving at least two guide rollers to the inner contour. If the guide rollers are arranged so that they can roll along the moving inner contour of the tube, a secure and permanent positioning of the planer blade to the inner contour and the weld seam is ensured.
[0036] In a further preferred embodiment of the method according to the invention, the lifted weld seam is guided through at least one opening of the support structure for the planer knife, which serves as a weld seam outlet, wherein the lifted weld seam is guided to at least one opening of the planer knife via a guide surface on the support structure and / or a guide surface arranged behind the cutting edge of the planer knife on the planer knife itself.
[0037] According to a third aspect of the present invention, the use of an internal pipe deburrer according to the first aspect of the invention is provided for deburring longitudinally welded pipes, in particular pipes with an inner diameter of less than 300 mm, preferably less than 200 mm, particularly preferably less than 120 mm, and a wall thickness of more than 2 mm, preferably more than 10 mm, particularly preferably more than 15 mm. The internal pipe deburrer according to the invention is particularly suitable for processing thick-walled pipes with a comparatively small inner diameter, since the effects achievable with it are also effective with comparatively low stiffness due to a reduced material thickness and overall stiffness of the internal pipe deburrer.
[0038] Page 115. Brief description of the characters
[0039] The invention is explained in more detail below with reference to 5 figures, from which preferred embodiments of the invention or parts thereof can be seen.
[0040] The figures show
[0041] Figure 1 is a perspective top view of a pipe internal deburring device according to the invention,
[0042] Figure 2 shows a cutaway side view of the internal pipe deburrer according to Figure 1, in an overall view (Figure 2a) and an enlarged detail view of the scraper bar module (Figure 2b),
[0043] Figure 3a shows a top view of a scraper bar module with a chipper blade inserted, but without a planer blade and corresponding support structure.
[0044] Figure 3b shows a perspective view from below of the scraper rod module according to Figure 3a.
[0045] Figure 4 shows a perspective view of a chopper blade with a corresponding support structure, showing a chopper blade in two different positions, and
[0046] Figure 5 shows a perspective view of a planer knife module with planer knife, support structure and copy rollers.
[0047] Page 126. Detailed description of the figures
[0048] Figure 1 shows a schematic top view of an internal pipe deburrer 1, which has a multitude of modular components that are aligned with each other and interchangeable. The internal pipe deburrer 1 comprises a scraper rod module 7, an impedance holder 6 in which (not shown) ferrites are housed, and a blade 13, whereby only the blade 13 does not fully penetrate a (not shown) slotted pipe or longitudinally welded pipe during operation of the internal pipe deburrer 1. The blade 13 serves, on the one hand, to align the internal pipe deburrer 1 at an angle within the (not shown) pipe, and on the other hand, to connect to supply lines for coolant and hydraulic fluids.The impedance holder 6, which is located directly below the welding device during operation of the internal pipe deburring machine 1, houses ferrites (not shown) that focus the magnetic field applied externally to the pipe (not shown) to weld a slotted pipe into a longitudinally welded pipe. A scraper bar module 7 is then attached to the impedance holder 6. This module contains, on the one hand, a support structure 4 for a planer blade 2 and, on the other hand, a support structure (not shown) for a chipper blade (not shown), arranged modularly and without contact, thus mechanically decoupled.In the operation of the internal pipe deburrer 1, a longitudinally welded pipe (not shown) is guided over the planer blade 2 in such a way that the planer blade 2 can continuously lift the weld bead protruding from the inner wall of the pipe (not shown), referred to in this application as the weld seam, from the inner wall of the pipe and then convey it by the support structure 4 for the planer blade 2 to the chipper blade (not shown), which cuts the weld seam to length and removes the cut-off parts of the weld seam from the scraper bar module 7. The connection of the individual modules 13, 6, 7 is effected by a sleeve-like sliding together of the mutually facing connecting surfaces of the individual modules 6, 7, 13, wherein the...
[0049] Page 13: Scraper rod module 7 has an additional protective plate 16, which, in the assembled state of scraper rod module 7 and impeder holder 6, provides additional protection for the impeder holder 6, which usually comprises an epoxy tube, against heat and mechanical impacts as well as against weld spatter occurring during the welding process.
[0050] Figure 2a shows a sectional view through the internal pipe deburrer 1 according to Figure 1. Supply lines 25 for both cooling water and hydraulic oil are arranged in the blade 13, ensuring the supply of these media to and from the internal pipe deburrer 1. The impedance holder 6, containing ferrites 26, is connected to the blade 13. These ferrites must be continuously cooled with water during operation to prevent overheating and deflection of the internal pipe deburrer 1. Adjoining the impedance holder 6, from right to left, is the scraper bar module 7, which has a hydraulically adjustable pressure roller 17 to ensure the desired degree of contact pressure of the planer blade 2 against the (not shown) inner pipe wall located above the planer blade 2.Likewise, in the scraper bar module 7 of the pipe deburrer 1, a support structure 4 for the planer knife 2 and a mechanically decoupled support structure 5 for a chipper knife 3 can be seen, wherein a hydraulic drive in the form of a hydraulic cylinder 10 is arranged in alignment with the chipper knife 3, which is mechanically decoupled from the planer knife 2 and enclosed in its own support structure 5 within the scraper bar module 7.
[0051] Figure 2b shows an enlarged sectional view of a part of the scraper bar module 7, comprising the hydraulic cylinder 10, the support structure 4 for the planer blade 2, and the support structure 5 for the chipper blade 3. The planer blade 2 continuously wears away a weld seam 18, more precisely the weld bead protruding from the weld seam on the inner wall 19 of the pipe, from the inner wall 19 of the pipe by the
[0052] Page 14. The pipe is continuously moved from right to left relative to the planer blade 2. After being lifted from the inner pipe wall 19, the weld 18 is guided along a guide surface 20 of the planer blade 2 and a corresponding guide surface within the support structure 4 towards the chipper blade 3. The chipper blade 3 is arranged within its support structure 5 so that it can oscillate from left to right, such that the weld 18 is guided through a cutting opening 8 within the chipper blade 3 and is cut to length with each stroke of the chipper blade 3. The oscillating movement of the chipper blade 3, and in particular its cutting edges 9 relative to the weld 18, is effected by a hydraulic cylinder 10, which is arranged in line with the direction of movement of the chipper blade 3 in order to minimize bending moments and inertial forces during operation of the pipe deburrer 1.Finally, the support structure 4 for the planer knife 2 shows two copy rollers 11a, 11b which, when the support structure 4 is suspended, can be tilted about a suspension point located between the copy rollers 11a, 11b, ensuring a secure and permanent alignment of the planer knife 2 with respect to the inner wall of the tube 19.
[0053] Figure 3a shows a perspective view of a scraper bar module 7, which is an integral yet replaceable component of a pipe deburring machine according to the invention (not shown). The scraper bar module 7 incorporates a receiver for the chipper blade and planer blade unit, with a chipper blade driver 3a. After insertion, the oscillating movement of the chipper blade (not shown) occurs longitudinally within the scraper bar module 7 and along the sliding surface 21 within the support structure 5 for the chipper blade (not shown). The support structure 5 for the chipper blade 3 can be clamped to the scraper bar module 7 by means of clamping elements (not shown) to ensure, on the one hand, a secure and permanent fit of the support structure 5 within the scraper bar module 7, and on the other hand, also to prevent the
[0054] Page 15 to simplify the regular replacement of the chopper blade 3 and especially its support structure 5.
[0055] Figure 3b shows another perspective view of the scraper bar module 7, with a pressure roller 17 protruding from the scraper bar module 7, which is designed and equipped to press and align the scraper bar module 7 and in particular the (not shown) planer knife against an (not shown) inner wall of the tube.
[0056] Figure 4 shows a perspective view of a support structure 5 for a chipper blade 3, where the chipper blade 3 is depicted in two different positions relative to a through-opening 22 for passing a (not shown) weld seam through the opening 8 within the chipper blade 3. The chipper blade 3 oscillates at least between the two positions shown in Figure 4, so that the cutting edges 9 provided at the edges of the opening 8 in the chipper blade 3 can cut the (not shown) weld seam to length during the oscillating movement.
[0057] Finally, Figure 5 shows a perspective view of a support structure 4 for a planer blade 2. The support structure 4 is mounted on two suspension pins 12, of which only one is shown due to the perspective view. This allows the support structure 4 to be tilted within the (not shown) scraper bar module. Along the longitudinal axis of the support structure 4, on both sides of the planer blade 2, are guide rollers 11a, 11b. During operation of the (not shown) internal pipe deburrer, these rollers run along the inner contour of a (not shown) pipe and ensure that even when the support structure 4 is tilted about the tilting axis 24 between the supports 12, the planer blade 2 is precisely aligned with the (not shown) inner wall of the pipe. The planer blade 2 has an odd cutting edge 23 to ensure that
[0058] Page 16 It is advantageous to support the lifting of the (not shown) weld seam from the (not shown) inner pipe wall.
[0059] Page 17 Reference Mark List
[0060] 1 internal pipe deburrer
[0061] 2 planer blades
[0062] 3 chopper knives
[0063] 3a Chopper blade drive
[0064] 4 Support structure for planer blades
[0065] 5 Support structure for chopper blades
[0066] 6 impedance holders
[0067] 7 scraper rod module
[0068] 8 Opening in the chopper blade
[0069] 9 cutting edges on the chopper blade
[0070] 10 hydraulic cylinders
[0071] 11a, b Copy rolls
[0072] 12 Suspension for the support structure of the planer blade 13 Sword
[0073] 14 impedance holders
[0074] 15 Opening in planer knife support structure
[0075] 16 mudguard
[0076] 17 Pressure roller
[0077] 18 weld seam
[0078] 19 Pipe inner wall
[0079] 20 Guide surface of the planer blade
[0080] 21 Cutting surface of the planer blade
[0081] 22 Average eye
[0082] 23 Cutting edge of the planer blade
[0083] 24 tipping axle
[0084] 25 supply lines
[0085] 26 Ferrite
[0086] Page 18
Claims
Patent claims 1. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes, comprising at least one planer blade (2) for removing a weld seam (18), at least one chipper blade (3) for chopping the weld seam (18) removed by the planer blade (2), and a drive (10) for oscillating the chipper blade (3) about a rest position, in particular relative to the removed weld seam (18), characterized in that the planer blade (2) on the one hand and the chipper blade (3) on the other hand are mechanically decoupled from each other in their own support structure (4, 5), which do not permanently touch each other during operation of the internal pipe deburrer (1).
2. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to claim 1, characterized in that it consists of interchangeable modules, comprising at least one blade (13) for aligning the internal pipe deburrer (1) at the weld seam, at least one impeder holder (14) in which ferrites are installed, at least one scraper bar (7) which carries the chipper knife together with support structure (5) and the planer knife (2) together with support structure (4), and that these modules are preferably assembled in a sleeve-like manner.
3. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to claims 1 and 2, characterized in that the at least one chopper knife (3) has at least one opening (8), preferably with two opposing inclined, preferably arcuate cutting edges (9).
4. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to the preceding claims, characterized in that the at least one chipper knife (3) can be actuated by a hydraulic drive (10), preferably a hydraulic cylinder. Page 195. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to claim 4, characterized in that the hydraulic drive (10) is arranged in alignment with the movement of the chipper knife (3).
6. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to one of the preceding claims, characterized in that the chopper knife (3) is designed and arranged to cut the raised weld seam (18) from the rest position by oscillating in a first direction of movement and in a second direction of movement.
7. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to one of the preceding claims, characterized in that the support structure (4) for the planer knife (2) has at least two copy rollers (11a, b) whose movement in a direction perpendicular to the longitudinal extension of the support structure (4) allows the position of the planer knife (2) to be adapted to the inner contour (19) of the pipe.
8. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to the preceding claims, characterized in that the support structure (4) of the planer knife (2) has at least one suspension (12), preferably on the longitudinal sides of the support structure (4), in order to insert the support structure (4) in the scraper bar (7), preferably a suspension (12) which allows the support structure (4) to tilt about a tilting axis (24) penetrating the suspension (12) or connecting two suspensions (12).
9. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to the preceding claims, characterized in that the support structure (4) of the planer knife (2) has at least one opening (15) which serves for weld seam drainage and through which the weld seam (18) lifted from the planer knife (2) can be guided through a guide surface of the support structure (4) and / or the planer knife (2) onto the chipper knife (3). Page 2010. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to one of the preceding claims, characterized in that the support structure (4) of the planer knife (2) is arranged to be tiltable in the scraper bar module (7).
11. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to claim 10, characterized in that the support structure (4) of the planer knife (2) is arranged to be tiltable about a tilting axis (24) in an angular range of up to ± 10°, preferably up to ± 5°, particularly preferably up to ± 2°.
12. Internal pipe deburrer (1) for internal deburring of longitudinally welded pipes according to claim 10 or 11, characterized in that the support structure (4) of the planer knife (2) is designed and arranged so that it only comes into contact with the support structure (5) of the chipper knife (3) when tilted to its maximum extent about the tilting axis (24).
13. Method for operating a pipe deburrer (1) according to one of the preceding claims, characterized in that the chopper knife (3) located in the pipe deburrer (1) oscillates from the rest position in a first direction of movement and in a second direction of movement to chop up the weld seam (18) lifted by the planer knife (2).
14. Method for operating a pipe internal deburrer (1) according to claim 13, characterized in that the lifted weld seam (18) is cut to length when passing through an opening (8) within the oscillating chopper blade (3).
15. Method for operating a pipe internal deburrer (1) according to claim 13 or 14, characterized in that the adjustment of the position of the support structure (4) of the planer knife (2) to the inner wall (19) of a pipe is carried out by contact and rolling of at least two copy rollers (11a, b) against the inner wall (19) of the pipe. Page 2116. Method for operating a pipe internal deburrer (1) according to one of the preceding claims 13 to 15, characterized in that the lifted weld seam (18) is guided through at least one opening (15) of the support structure (4), which serves as a chip outlet, wherein the lifted weld seam (18) is guided over a guide surface of the support structure (4) and / or the planer knife (2) to at least one opening (8) of the chipper knife (3).
17. Method for operating a pipe deburrer (1) according to one of the preceding claims 13 to 16, characterized in that the replacement of parts of the pipe deburrer (1) inserted into a pipe, preferably the planer blade (2) and / or the chipper blade (3) and / or the ferrites (26), particularly preferably together with the respective support structures (4, 5, 6) is carried out while the pipe deburrer (1) remains inside the pipe and by creating an opening in the pipe wall to allow access to the pipe deburrer (1) or parts thereof from the outside.
18. Use of a pipe internal deburrer (1) according to claims 1 to 12 for removing weld seams, characterized in that it is used for deburring longitudinally welded pipes, in particular pipes with an internal pipe diameter of less than 300 mm, preferably less than 200 mm, particularly preferably less than 120 mm, and a wall thickness of more than 2 mm, preferably more than 10 mm, particularly preferably more than 15 mm, particularly preferably more than 18 mm. Page 22