JP2005521559A - Bending machine for profile material and cylindrical tube - Google Patents

Abstract

The present invention relates to a profile-bending roller machine comprising a receiving device, a feeding device and a bending device for a profile material and a cylindrical tube to be bent. The bending head (1) of the profile-bending roller machine consists essentially of a front and back arrangement of a supporting roller pair (18), a subsequent rolling roller pair (17) and a subsequent at least one bending roller (14). In this case, the bending roller is fixedly attached to a rotating disk (12) having a center of rotation parallel to the longitudinal axis of the profile material (5) to be bent. The rotating disk itself is a portion of a cross table that can be adjusted in position in at least two directions perpendicular to each other and can be adjusted in accordance with the bending conditions of the profile material.

Description

  The invention relates to a bending machine for a profile material and a cylindrical tube according to the superordinate concept of claim 1.

A bending machine for bending cylindrical tubes is known from German Offenlegungsschrift 19630025. With this machine, the cylindrical tube profile material can be freely bent in a two-dimensional and three-dimensional range. However, the production yield of this known bending machine is only limited to a low processing rate with a low degree of deformation. A similar device is shown in DE 4041668 in which the profile material to be bent is pushed through a mandrel and deformed by a three-roll bending device, The bending apparatus essentially consists of a pair of support rollers, a pair of rolling rollers, and a pair of bending rollers arranged side by side.
The bending roller pair is attached to a table that is movable in three directions (X, Y, and Z directions) perpendicular to each other, so that free bending is possible.

However, since there was no roller driving device, the bending device was attached to a cross table that was movable in three directions, so it was possible to perform only a very slow bending. Only processing speed was obtained.
German Patent Application Publication No. 19630025 German Patent Application No. 4041668

  The object of the present invention is therefore to enable a bending machine for profile materials and cylindrical tubes of the type mentioned at the outset to achieve very high processing speeds with a higher degree of deformation of the profile material to be bent. It is to develop.

  In order to solve the above-mentioned problems, the present invention comprises a bending head comprising at least a support roller pair, a subsequent rolling roller pair, and at least one bending roller followed by the bending roller, wherein the bending roller is bent. It is fixedly attached to a rotating disk having a center of rotation arranged at a distance from the profile material parallel to the longitudinal axis of the profile material to be processed, and the rotating disk itself is at least It is a cross table portion whose position can be adjusted in two directions perpendicular to each other.

  In other words, according to the above technical theory, instead of the arrangement of a plurality of bending rollers (for example, a pair of bending rollers), only one bending roller, which is attached to a rotating disk driven in rotation, is required. In this case, a significant advantage is obtained in that the rotating disk is also a part of a cross table that can move at least in the Y and Z directions.

  A so-called cross table has a through hole at its center, and a rotating disk having a similar through hole is attached within the range of the through hole. The through hole of the rotating disk is necessary for penetrating the profile material to be bent.

  By the way, the cross table itself is made up of two plates whose positions can be adjusted perpendicularly to each other on the same plane. As a result, the profile material to be conducted to the opening and to be bent is one or the other cross. Depending on the movement position of the table, it is deformed by being pushed out to the left or right as needed, down or up, or a combination of these, depending on the bending roller attached to the cross table. As a result, for example, a spiral shape is obtained by bending the profile material. It will be appreciated that all possible other shapes, such as bending at the same radius and / or various radii, can also be obtained from the original linear profile material.

  It is already known from German Patent Application No. 19630025 that one bending roller is mounted on a rotating disk that is driven to rotate in a radial direction. However, this known device has the disadvantage that only a low speed with a low degree of deformation is possible. Therefore, in this case, it is very difficult to drive the bending roller in the radial direction, which must be attached to a rotating disk to be rotated, so that only a profile material having a small cross section can be bent.

  This generally increases the amount moved during bending, so that only a negligible processing speed can be achieved.

  In particular, a radial feed operation is only possible with a relatively small force, since it is only difficult to incorporate the appropriate corresponding actuator into the rotating disk. For example, in the known bending apparatus, the rotational shape of the rotating disk can only reach a maximum of 360 ° in one direction in relation to the radial driving of the bending roller, so that the spiral cannot be obtained from a cylindrical tube. .

  In this case, the rotating disk is now fitted with a bending roller which is immovable in the radial direction, ie fixedly arranged, but the rotating disk itself is moved in the Z direction by its rotating bearing. The invention is used which is defined as being attached to a movable and fixable cross plate.

  The bending roller which can be fed in the radial direction is replaced according to the invention with a fixed bending roller which is now attached to a cross plate which is movable in the Z direction.

In addition, however, the invention still stipulates that an additional sliding action in the Y direction can also be assigned to this bending roller. This achieves a considerably greater degree of freedom in the free bending of the profile material. Since it is no longer necessary to attach a radial slide drive for the bending roller in the area of the rotating disc, it now applies any desired bending force that is required without damaging the bending space there. It is possible.
That is, the driving means is mounted around the bending head and is implemented in the form of a cross plate.

  This allows the bending roller to move freely in the YZ plane by a corresponding sliding drive of the assigned cross plate, which was not possible with the prior art.

  In this way, because of better control in the YZ plane this time, a considerably finer adjustment is possible, and a significantly increased bending speed can thus be achieved.

  Furthermore, it is possible to obtain a profile material which is wound several times in a spiral shape, which was not possible in the case of the above-mentioned German Patent Application No. 19630025.

  Independently, and based on the invention as an independent subject matter, is the further recognition that, according to the invention, higher deformations of the profile material are possible at higher speeds. .

  In this regard, in the present invention, it is defined that at least one of the existing rolling roller pair and the even rolling roller moves, and is formed so that it can be fed into a profile material to be bent. According to the present invention, a rolling force to the profile material to be bent can be applied to these rolling rollers.

  In other words, a feeding force is assigned to at least one of the existing rolling roller pair and the even rolling roller, which feeds the profile material to be bent with a correspondingly high pressure, and this This is effective to cause a flow process in which the profile material can later be bent to the correct dimensions by a bending roller. This induced flow process significantly reduces the required force on the bending roller. Similarly, the processing speed of the profile material to be bent can be considerably increased.

  The rolling and the flow processes caused thereby can achieve a degree of deformation that is not possible using conventional bending techniques. In other words, the ratio of the size or diameter of the profile material to the inner diameter of the profile material to be bent can still be reduced by this, without risk of crack formation or minimization of deformation.

  For this, it is shown that the ratio of the size or diameter of the profile material to the inner diameter of the profile material to be bent can be 1.5: 1 to 1: 1 by the rolling and the flow process caused thereby.

  The rolling process is performed exactly at the bend line of the profile material to be bent, i.e. where the material changes due to the bending process. Due to the induced flow process, the bending can be performed with a smaller bending force than in the conventional method.

  A further advantage resides in improved bending accuracy due to a significant reduction in springback in the profile material to be bent. The artificially induced flow process caused by the rolling roller sufficiently avoids crack formation in the structure. That is, the elongation process at the time of bending the conventional profile material is eliminated in the case of this bending method. This physical process in the profile material to be deformed allows a significantly increased deformation rate compared to conventional bending methods.

Furthermore, the method has the advantage that any arbitrary bending profile can be achieved in a single bending process. On the other hand, in the case of the conventional bending method of 3 to 4 rollers, a plurality of bending processes are required to obtain a finished bending shape of the profile material. On the other hand, when the bending method according to the invention is used, a significantly increased yield is achieved. This provides improved material compatibility of the profile material to be bent and a much more careful treatment of the surface of the profile material that eliminates post-treatments, such as pre-treatment for painting or anodizing. Brought about.
Therefore, in the case of a high throughput, a high degree of deformation of the profile material to be bent can be achieved accordingly.

  By the way, it is pointed out that the present invention is not limited only to the bending of a cylindrical tube, but the hollow profile material which is open and closed as a whole can be deformed.

  It is certainly known that a rolling procedure is intended in the case of a profile material to be bent in the two-dimensional range (cf. DE 197 33 932). However, this relates to a centered tension bending process via a bending jig given in advance.

  However, in the case of the above document, the bending roller or the bending roller pair is separated from the center of rotation of the rolling roller in a decisive manner during the bending process. This is undesirable for bending at narrow radii and leads to disadvantages, especially in the case of three-dimensional bending of profile materials.

  In other words, the bending rollers should be arranged on the rolling roller pair only at a small interval as much as possible, and nevertheless an appropriate three-dimensional bending process must be possible.

  In this case, exactly, the bending roller is firmly attached to the rotating disk and acts on the same plane as the rolling roller pair, but at this time, the bending roller is spaced from the rolling roller pair. The present invention, which is determined to be arranged, is used. That is, there is no distance between the effective bending roller plane and the effective rolling roller plane, as described in the older German Patent Application Publication No. 19733392. This is achieved by reducing the resistance of the material to be deformed by the flow process occurring in the outer part of the profile material to be bent at the rolling roller plane.

  In other words, the present invention has the advantage that, according to the present invention, the rotating disk can be rotated by more than 360 ° or several times as much, which is the prior art (German Patent Application Publication No. 196). No. 30 025). Since the feeding operation in the radial direction in the rotational drive is no longer necessary, according to the present invention, it is possible to rotate the rotating disk even faster. This is a highly dynamic rotation where high throughput is achieved with small dimensions. It is thus possible to carry out a high-speed axial push-in action for the profile material to be bent, which was not possible with the prior art.

  In other words, it is important to be able to adjust the bending roller as quickly as possible by the feeding operation required at an angle to the longitudinal axis of the profile material to be bent. Is actually easier and faster.

  The problem with bending at high speed is overcoming the inertia of the moved object. The only objects to be moved according to the invention are the rotating disk and the drive for the cross plate arranged externally away from the bending roller. Therefore, the direction of bending can be changed in a very short time based on the rotation of the rotating disk, which is not possible with a large and heavy drive on a rotating disk according to the prior art. is there. Therefore, in the case of the present invention as well, by comparison, electromechanical drives rather than hydraulic drives are used for various movements, because electromechanical drives are much faster. This is because it can be operated and more accurately controlled.

  The inventive subject matter of the present invention can be obtained not only from the subject matter of the individual claims of the claims but also from the combination of the individual claims of the claims.

  All data and structures disclosed in the document including the abstract, especially the three-dimensional design shown in the drawings, are in accordance with the present invention as long as they are new to the prior art, alone or in combination. Patent protection is claimed as indispensable.

  Next, the present invention will be described in detail with reference to the drawings showing a plurality of implementation methods. Thus, further features and advantages of the present invention will become apparent from the drawings and the description thereof.

FIG. 1 shows a bending machine for a profile material and a cylindrical tube, comprising a bending head 1 fixedly coupled to a bridge 2 to which a series of spaced apart guide devices 6 are mounted. Overall shown.
At the rear of the bridge 2, in this case, a mandrel station 3 for holding the mandrel bar 21, and an extrusion slider 4 used to push the profile material 5 to be bent into the bending head 1. Is provided.

  In this case, there are two methods for feeding the profile material. One or more pairs of rollers are rotationally driven in the bending head so that the rollers pair carry the profile material lengthwise by the rotational motion of the pairs of rollers, or in other embodiments The roller pair is not driven to rotate, and only the profile material to be processed is pushed through the bending head 1 through the extrusion slider 4.

  FIG. 1 shows that the bending head 1 is still covered by a hood 7.

  With respect to FIG. 2, further details of the bending head 1 can be found.

  A vertical web plate 9 is disposed on the base plate 8, and a first Z-direction slide driving device for the cross table 10 is disposed on the web plate.

  In this case, the slide drive is performed by the drive device 16 for the cross table 10.

  Another cross table 11 is arranged on the cross table 10 so as to be drivable in the Y direction. In this case, the driving is performed by a driving device 26 fixed to the cross table 10. Therefore, these two cross tables 10 and 11 are mutually defined by the orthogonal YZ coordinate system. This coordinate system is also aligned perpendicular to the feed direction X of the profile material 5 to be deformed, resulting in an orthogonal XYZ coordinate system for the reference plane of the device according to the invention as a whole. It is done.

  Further, a rotating disk 12 is rotatably supported on the cross table 11 in parallel therewith, and this rotating disk is rotated via a driving belt 23 from a driving device 13 fixed to the cross table 11. It is driven. A holder 15 is connected to the rotating disk 12, and a bending roller 14 is fixed to the holder.

  Further details of the bending head 1 are apparent from FIGS. 3 and 4 as follows.

  In FIG. 4, the mandrel bar 21 enters and grips the profile material 5 to be bent, and the mandrel 22 is disposed inside the profile material 5 within the bending range. It can be seen that it is always held within the bending range via the drive of the mandrel station.

  The bending device essentially comprises a support roller pair 18 on the side of the extrusion slider, a rolling roller pair 17 arranged in front of it in the bending direction and at least one bending roller 14 arranged in front of it.

  The roller pairs 17 and 18 are present in pairs, but may be present in pairs or several times as a result, that is, the roller pairs are profile materials to be bent. It is pointed out that it can be arranged in a star around 5. Even though any number of such roller pairs may exist in various planes, for the sake of simplicity, the following description is based only on roller pairs 17, 18 in one plane.

  The same applies to the bending roller 14 which exists only as a single bending roller. In another embodiment of the invention, another bending roller facing the bending roller 14 shown, or even a number of bending rollers distributed around it, is assigned to the profile material 5 to be bent. May be contemplated.

  In any case, it is possible to assign the feeding force to the profile material 5 to be bent at least to the rolling roller pair 17 but also to the support roller pair 18 in the case of the embodiment shown in FIG. In case it is important. In other words, the present invention assumes that, in the simplest embodiment, only a corresponding feeding force can be assigned to the rolling roller pair 17 via a corresponding feeding drive device 19.

  However, in the case of an expanded embodiment, for example shown in FIG. 4, the support roller pair 18 is additionally assigned a corresponding feed force via another feed drive 20 as well. It is done.

  This is done by attaching a bracket 27 to the vertical web plate 9 via a sliding guide 32 that is locked in operation. That is, the bracket 27 can be fed into the profile material 5 via the sliding guide 32 in order to adjust the distance between the roller pairs 17 and 18. The bracket is then locked. As can be seen from FIG. 3, the bracket 27 is provided with feeding drive devices 19 and 20, which can be freely swung in accordance with the assigned levers 33 and 36, respectively. Acts on the edge. This special lever principle is explained in more detail in FIG.

  Each feeding drive device 19, 20 acts on a force application point 34, 35 at the free end of each one of the levers 33, 36, and the levers respectively rotate the rotation shafts 37, 48 of the rollers 17, 18. In any case, it is important to support this.

  Further, according to FIG. 6, the levers 33 and 36 are supported on the wall of the bracket 27 by the eccentric cam bearing portion 40, while the rotary bearing portions 37 and 48 are free of the levers 33 and 36, respectively. It is supported by a pivotable end.

  Therefore, as shown in FIG. 6, the turning operation in the direction of the arrow 47 is performed via the feeding drive device. In this way, the lever rotates around the bearing portion 40, and the rotation shafts 37 and 48 are rotated. By maintaining the eccentricity, the rolls 17 and 18 move toward and away from the direction of the profile material in the direction of the arrow 49.

  FIG. 4 further shows that the cross table 10 assigned in the Z direction is slidably supported by the linear guide 24 on the web plate 9. A driving device 16 is used for this slide.

  This drive consists of a pinion that meshes with a corresponding rack, which is the part of the linear guide 24.

  The sliding guide in the Y direction of the cross table 11 is effected in this case by a horizontally oriented guide, which essentially consists of guide rollers arranged parallel to each other at intervals, These guide rollers roll on the guide surfaces of the guide rails 50 facing each other and spaced apart from each other.

  As a result, the driving device 26 acts on the cross table 11 via the pinion and the rack.

  The guide roller 25 is attached to the cross table 10, and the guide rail 50 is attached to the cross table 11.

  A rotary drive device 13 for the rotary disk 12 is also attached to the cross table 11. The rotary bearing portion of the rotary disk is arranged on the cross table 11 and passes through the rotary disk 12 to guide the profile material to be bent. At this time, the profile material to be bent A bending roller 14 is placed on at least one side of the bending roller 14, and the bending roller is rotatably supported by the holder 15.

  The holder 15 is firmly fixed to the rotating disk 12. Furthermore, the bracket 27 also has an X-direction feeding drive device. In this case, the bracket 27 is further fixedly coupled to the web plate 9 via the joining flange 28.

  In the length direction of the profile material to be bent, two brackets 27 (only one is shown in the case of FIG. 4) are arranged parallel to each other and spaced apart from each other. These brackets are connected to each other under a common floor plate 29. A guide slider 30 is engaged with the floor plate 29, and a unique feeding drive device 31 is assigned to the guide slider.

  The guide slider 30 supports the upper rolling roller 17 and the upper support roller 18. Accordingly, these rollers can be fed toward the bending roller 14 in the X direction (the length direction of the profile material to be bent).

  In the case of the drawings in FIGS. 4 and 5, that is to say, in relation to the upper active rollers 17 and 18 which are formed adjustable in their feeding action into the profile material and in the direction of the longitudinal axis of the profile material. There are passive lower rollers 17, 18 that are not position adjustable.

  However, in the case of another aspect of the present invention, the lower rollers 17 and 18 may be similarly formed so as to be adjustable in the length direction of the profile material. As a result, a combination of these roller pairs 17, 18 which are opposite and are at the same height in the vertical direction is always obtained.

  The adjustment principle for generating the rolling force to the rolling roller pair or for generating the supporting force to the support roller pair has already been explained by the eccentric plate 39 described therein in FIG.

  That is, while the eccentric plate 39 is rotatably attached to the guide support portion 30 by the eccentric bearing portion 40, the corresponding feeding drive devices 19 and 20 are rotatable to the brackets 27 arranged in parallel to each other. Is attached. This is schematically illustrated in FIG. 4 by a small fulcrum.

  In this case, the support roller 18 and the rolling roller 17 are each supported by a bearing shaft 38, and the bearing shaft is rotatably supported by the levers 33 and 36.

  In the case of the embodiment according to FIG. 7 which is different from FIGS. 4 and 5, another feeding principle is used.

  In this case, a “passive” lower bracket 41 is provided for holding the lower rollers 17, 18, and an actively driven bracket 42 is arranged opposite thereto. ing. The bracket 42 is held by the web plate 9 so as to be slidable in the sliding guide 32 through a piston-cylinder device having a cylinder 43. At this time, the piston rod of the cylinder 43 is connected to the rollers 17 and 18. It acts on the shoe 44 which supports the rotating shafts 37 and 38 via the plate 46.

  This feeding principle is schematically illustrated in FIG. It can be seen that the rotary shaft 48 is firmly fixed to one end of the shoe 44, while the opposite end of the shoe is formed to be pivotable in the arrow direction 47.

  That is, the rotating shaft 48 is fixedly coupled to the bracket. That is, the shoe 44 is formed so as to be pivotable about the shaft 48.

  Therefore, the rotating shaft 37 of the rolling roller pair 17 is supported on the freely pivotable end of the shoe. Therefore, the upper rolling roller 17 can be fed in the arrow direction 47 with respect to the profile material to be bent by a high force by the action of the force of the feeding device (cylinder 43 and bearing 45).

  Thus, through the device according to FIG. 6 as well as via the device according to FIG. 8, the profile to which the very high rolling force of the upper rolling roller 17 is to be bent due to the relatively large leverage that is effective. Affected by wood.

  It is still pointed out that each is bent around a rolling roller. Depending on the direction of bending, this can be done around the upper or lower rolling roller 17 or it can be carried out around a rolling roller (not shown) mounted at an angle transverse to these. Can also be

  As long as the corresponding supporting force is also exerted on the support roller pair 18 via the above-mentioned feeding drive device, in this case, it is also assumed that the mandrel 22 is also present in the lower and inner ranges of the support roller pair 18. This is in order to enable a corresponding support action at this point by supporting the profile material from the inside.

1 is a schematic perspective view of a bending machine according to the present invention. FIG. 2 shows the bending machine according to FIG. 1 with the cover removed. FIG. 3 is a side view of the device according to FIG. 2. FIG. 4 is an enlarged side view of the bending head according to FIG. 3. It is the figure rotated 90 degrees with respect to FIG. It is the schematic of the adjustment apparatus of the rolling roller provided with the feeding apparatus through an eccentric board. It is a figure which shows the embodiment which added the change with respect to FIG. 4 where rolling force is added by another apparatus. It is a figure which shows description of the principle of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending head 2 Bridge 3 Mandrel station 4 Extrusion slider 5 Profile material 6 Guide 7 Cover 8 Base plate 9 Web plate 10 Cross table (Z direction)
11 Cross table (Y direction)
12 Rotating disc 13 Drive device 14 Bending roller 15 Holder (for 14)
16 Drive unit (for 10)
17 Rolling roller pair 18 Supporting roller pair 19 Feeding drive device 20 Feeding drive device 21 Mandrel bar 22 Mandrel 23 Drive belt 24 Linear guide 25 Guide roller 26 Drive device (Y)
27 Bracket 28 Joint flange 29 Floor plate 30 Guide slider 31 Feeding drive device 32 Sliding guide 33 Lever 34 Action point 35
36 Lever 37 Rotating shaft 38 Bearing shaft 39 Eccentric plate 40 Eccentric bearing portion 41 Bracket 42 Bracket 43 Cylinder 44 Shoe 45 Bearing 46 Plate 47 Arrow direction 48 Rotating shaft 49 Arrow direction 50 Guide rail

Claims (22)

  In a bending machine comprising a receiving device, a feeding device and a bending device for a profile material and a cylindrical tube to be bent, the bending head (1) of the bending machine has at least one pair of support rollers (18), It consists essentially of the following arrangement of at least one pair of rolling roller pairs (17) followed by at least one bending roller (14), where the bending roller (14) is to be bent. It is fixedly attached to a rotating disk (12) having a center of rotation parallel to the longitudinal axis of the profile material (5), and the rotating disks (12) themselves are at least perpendicular to each other. Bending machine characterized in that it is a part of a cross table that can be adjusted in two directions and can be adjusted according to the bending conditions of the profile material (5)   The bending machine according to claim 1, characterized in that the rotating disc (12) can be rotated in the same place without being hit by a drive device (13).   The bending machine according to claim 1 or 2, characterized in that the cross table comprises two cross plates (10, 11) whose positions can be adjusted perpendicularly to each other on the same plane.   4. Bending machine according to claim 1, 2 or 3, characterized in that the cross plate (10, 11) can be adjusted in position by means of a slide drive (16, 26).   The rolling roller pair (17) and / or the support roller pair (18) can be fed into and / or removed from the profile material (5) by a feeding drive device (19, 20). The bending machine according to any one of claims 1 to 4.   6. The rolling roller pair (17) and / or the support roller pair (18) can be fed and / or removed towards the bending roller (14). The bending machine according to any one of claims.   Only the upper or lower roller of the rolling roller pair (17) and / or the support roller pair (18) can be fed and / or removed toward the bending roller (14). The bending machine according to any one of claims 1 to 6.   Feeding and / or unloading of the rolling roller pair and / or the support roller pair (17, 18) via the sliding guides (32) of the bracket (27), respectively, is free according to the corresponding lever (33, 36). Bending machine according to any one of the preceding claims, characterized in that it is performed by a feed drive device (19, 20) acting on a pivotable end.   Each lever (33, 36) is supported on the wall of the bracket (27) by an eccentric bearing portion (40), while each rotary bearing portion (37, 48) of the lever (33, 36) respectively. The bending machine according to claim 1, wherein the bending machine is attached to a freely pivotable end.   An upper bracket in which the feeding of the rolling roller pair (17, 18) is driven by a passive lower bracket (41) for holding the lower roller (17, 18) and actively The bending machine according to any one of claims 1 to 9, wherein the bending machine is performed on (42).   11. Bending machine according to claim 10, characterized in that the lower bracket (41) is also driven actively for holding the lower rollers (17, 18).   The bracket (42) is slidably held in the web plate (9) in a sliding guide (32) via a piston-cylinder device having a cylinder (43). Bending according to claim 10 or 11, characterized in that the piston rod acts via a plate (46) on a shoe (44) that supports a rotating shaft (37, 38) of the roller (17, 18). machine.   The rotating shaft (48) is firmly fixed to one end of the shoe (44), while the opposite end of the shoe (44) is formed to be pivotable in the arrow direction (47). The bending machine according to any one of claims 10 to 12, characterized in that:   One or more pairs of rollers are driven to rotate in the bending head (1). As a result, the pair of rollers conveys the profile material (5) in the length direction by the rotation of the rollers. 14. Bending machine according to any one of the preceding claims, characterized in that it is characterized in that   The profile material (5) to be bent is pushed through the bending head (1) via an extrusion slider (4), according to any one of claims 1 to 14. Bending machine.   16. A mandrel station (3) for holding a mandrel bar (21) is provided at the rear of the bending head bridge (2). The bending machine according to the item.   The mandrel bar (21) enters and grips the profile material (5) to be bent, and the mandrel (22) is arranged inside the profile material (5) within the bending range. A bending machine according to any one of the preceding claims, characterized in that the mandrel is always held within the bending range via the drive of the mandrel station.   18. Bending machine according to any one of the preceding claims, characterized in that the rolling roller (17) causes a flow process outside the profile material in the outer curved part.   19. The method according to claim 1, wherein the flow process reduces the resistance moment of the profile material, so that the bending process no longer requires a significantly reduced bending force. The bending machine described.   Bending machine according to any one of the preceding claims, characterized in that the bending process for the profile material to be bent is performed in a single pass.   2. The ratio of the size or diameter of the profile material to the inner diameter of the profile material to be bent can be 1.5 to 1 to 1 by rolling and the flow process caused thereby. 21. The bending machine according to any one of items 1 to 20.   The bending process for the profile material to be bent is determined by the simultaneous use of a bending roller (14) and a rolling roller (17). Bending machine as described in.

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