EP3782745B1 - Straightening machine, maintenance device and method for making straightening rolls accessible for the maintenance of a straightening machine - Google Patents

Description

The invention relates to a system consisting of a straightening machine with maintenance device, comprising a straightening machine for straightening a metal strip or flat metal parts according to the preamble of claim 1, and a method for making straightening rollers accessible for the maintenance of such a straightening machine.

A leveler of the present type includes a number of upper leveling rolls journaled in an upper mill and a number of lower straightening rollers journaled in a lower mill. The upper and lower straightening rollers are arranged in such a way that they form a straightening gap in a working area between an inlet and an outlet of the leveler in order to act on the metal strip or metal part to be straightened from above and from below and to pass this in a working direction from the inlet to the outlet to guide the straightener.

Straightening machines of the present type are used to eliminate tension and unevenness in metal strips or metal parts. For this purpose, the upper and lower straightening rollers are offset from one another along the straightening gap in such a way that the material to be straightened is alternately bent upwards and downwards on the straightening rollers. The bending takes place in such a way that the material is bent beyond its yield point, at least on the first straightening rollers, so that undesired bends and stresses in the material are eliminated as completely as possible. The material is usually heavily plasticized on the first straightening roller of the leveler. The material is bent slightly less at each subsequent straightening roller, and the material is no longer plasticized at the last straightening roller, ie it is only elastically deformed.

In the metalworking industry, metal strips are often used, which are delivered as so-called coils and unwound from there for production. The winding of the strip material into coils, as well as any previous thermal treatments and the like, result in unevenness and tension in the strip material, which is unfavorable for further processing. Therefore, after being unwound from the coil, metal strips are generally guided through the straightening gap of a straightening machine of the present type, from which they leave flat and free of tension. The same applies to flat metal parts that are to be freed from unwanted bends and stresses.

From time to time, to maintain a straightening machine, it is necessary to make the straightening rollers accessible from the outside, for example in order to inspect them, remove contamination or, if necessary, replace them. Since the straightening rollers are not only mounted in the upper and lower roller frame, but also have to be coupled to a drive device, and moreover, as a rule, there are several pairs of support rollers for each straightening roller in order to absorb the forces acting on the straightening rollers during operation and a deflection of the straightening rollers To prevent this, it is very complex and time-consuming to remove and disassemble the upper and/or lower roller frame from the straightening machine in order to make the straightening rollers accessible for the purpose of upcoming maintenance work, which can also consist of a pure inspection. In addition, large straightening machines are equipped with straightening rollers that can each weigh several hundred kg and therefore cannot be handled without tools.

In order to be able to make the straightening rolls of a straightening machine of the present type accessible without having to remove the roll mills, it is, for example, from EP 2 190 603 B1 known to attach the upper straightening rollers and the lower straightening rollers together with their support rollers and support roller blocks on an upper or lower slide plate, with which they are transverse to the working direction of the work area on an operating side of the straightener of the straightening machine and can be retracted into it again. For this purpose, coupling elements for coupling and uncoupling drive shafts of the drive device to and from the straightening rollers are located opposite the operating side of the straightening machine, on a drive side thereof. For this purpose, the straightening rollers of this known straightening machine are fastened in an interchangeable cassette on the respective slide plate, which is provided with bearing strips both on the operating side and on the drive side of the straightening machine, in which the straightening rollers are mounted and held.

This known concept of being able to move out the straightening rollers of a straightening machine of the present type by means of slide plates on the operating side of the straightening machine leads to considerably easier access to the straightening rollers, since only the straightening gap is opened slightly, safety devices on the slide plates or roller mills are released and the respective slide plate off must be pulled out of the work area of the straightener to gain access to the straightening rollers. The slide plates thus function as maintenance equipment for the leveler.

Especially in the case of straightening machines with straightening rollers, which can no longer be removed from the interchangeable cassette or the associated slide plate by hand because they are so heavy, it has turned out that the accessibility of the upper straightening rollers poses an additional challenge. Because when the upper straightening rollers are moved out of the working area of the straightening machine together with the upper slide plate, the upper straightening rollers hang in their bearings below the upper slide plate and cannot be detached from their bearings without additional securing. The removal of the upper straightening rollers is also made more difficult because they cannot be easily attached to a crane for this purpose because of the slide plate located above them, as is the case with the lower straightening rollers, which naturally lie above the lower slide plate.

The invention is therefore based on the object of proposing a system consisting of a maintenance device and a straightening machine of the type mentioned at the outset, in which there is at least one lower slide plate for extending the lower straightening rollers, as well as a method for making straightening rollers accessible for maintenance of a straightening machine. the proposed system or method ensures improved accessibility of the upper straightening rolls.

This object is achieved by a system having the features of claim 1 and by a method having the features of claim 9. Preferred configurations of the system can be found in claims 2 to 8; advantageous developments of the method are laid down in claims 10 to 12.

A straightening machine from the system according to the present invention therefore comprises, as initially known per se, a number of upper straightening rollers, which are mounted in an upper roller frame, a number of lower straightening rollers, which are mounted in a lower roller frame, the upper and lower straightening rollers are arranged in such a way that they form a straightening gap between an inlet and an outlet of the straightening machine in a working area in order to act on the metal strip or metal part to be straightened from above and from below and this in a working direction from the inlet to the outlet through the straightening machine lead, and also includes a lower slide plate, with which the lower straightening rollers can be moved out of the work area of the straightening machine and retracted transversely to an operating side of the straightening machine. An upper pusher plate for the upper straightening rolls may be present; however, in many cases it can be dispensed with since, according to the inventive concept, the upper straightening rollers can be moved out of the working area of the straightening machine together with the lower straightening rollers on the lower slide plate. For this purpose, according to the invention, an interchangeable prism is provided as a maintenance device or as an extension of the maintenance device, which can be inserted into the straightening gap (usually after it has been widened) and which is designed in this way is that it then rests on the lower straightening rollers when the lower slide plate is extended from the working area, while the upper straightening rollers rest on the exchangeable prism.

The lower slide plate can therefore optionally, as is known from the prior art, be moved out of the working area of the straightening machine and back into it with the lower straightening rollers, or, according to the present invention, after inserting the interchangeable prism into the straightening gap, with the lower straightening rollers, with the interchangeable prism resting on these and with the upper straightening rollers resting on the interchangeable prism, can be moved out of the working area of the straightening machine and retracted again. With the second alternative of extending the lower slide plate, the upper straightening rollers are made accessible, advantageously in such a way that the upper straightening rollers are accessible from above, in particular for a crane, when the lower slide plate is in the extended position. There is then no upper slide plate, as is the case in the prior art, which would cover the upper straightening rollers upwards and prevent direct access from above.

The method according to the invention for making straightening rollers accessible for the maintenance of a straightening machine, which is designed as described above, therefore includes raising the upper roller frame relative to the lower roller frame to widen the leveling gap (whereby according to the invention only the relative movement is important, i.e. the lower roller frame are lowered), inserting an interchangeable prism into the widened straightening gap, whereby the interchangeable prism is preferably placed directly, but optionally also indirectly, on the lower straightening rollers, detaching an upper bearing strip, in which the upper straightening rollers are mounted, from the upper roller frame and depositing the upper straightening rollers on the interchangeable prism (whereby this process step can be carried out at the same time or in reverse), detaching a lower bearing bar in which the lower straightening rollers are mounted and/or the lower slide plate from the lower roller frame and pulling out the un lower slide plate together with the one on the lower one Exchangeable prism resting on the straightening rollers and the upper straightening rollers resting on the exchangeable prism from the working area of the straightening machine.

As is known per se, the straightening machine according to the invention preferably has, at least on the operating side of the straightening machine, an upper bearing bar in which the upper straightening rollers are mounted, and a lower bearing bar in which the lower straightening rollers are mounted. The upper and lower bearing guides are directly, or indirectly by means of a fastening in a slide plate, detachably fastened in the respective roller mill in order to move the lower straightening rollers, or according to the invention optionally the lower straightening rollers together with the upper straightening rollers, with the lower slide plate out of the working area of the straightening machine to be able to

The lower slide plate of the straightening machine according to the invention can carry lower support roller blocks with support rollers mounted therein, on which the lower straightening rollers rest and from which the lower straightening rollers are supported during operation of the straightening machine. The lower bearing strip for the lower straightening rollers is then attached directly or indirectly to the lower slide plate, so that when the lower slide plate is pulled out, both the support roller blocks with the support rollers mounted therein and the lower straightening rollers together with the lower slide plate are moved out of the working area of the leveler and be retracted again. Within the scope of the present invention, at least one interchangeable cassette can also be provided, in which in particular the lower straightening rollers are seated and which can be extended and retracted with the lower slide plate.

A driver device is preferably provided for coupling the upper bearing strip to the lower bearing strip. This driver device can ensure that the upper bearing bar with the upper straightening rollers mounted therein is moved out of the working area of the straightening machine together with the lower bearing bar, the lower straightening rollers and the lower slide plate. This driver device can be attached to the lower bearing bar and/or to the interchangeable prism; the latter also in addition to the interchangeable prism to be coupled to the lower and upper bearing bar. Pivotable clamping lugs attached to the driver device are preferably used to fasten the upper bearing strip.

A further preferred embodiment of the straightening machine according to the invention consists in the presence of a holding bar for attaching to the upper bearing bar, the holding bar being provided with a receptacle for the upper straightening rollers, in which the upper straightening rollers can be fixed with at least one axial degree of freedom. In order to facilitate re-coupling into the coupling elements of a drive device when the upper straightening rollers are being retracted, it is advantageous if the straightening rollers can rotate about their longitudinal axis despite being axially fixed in the holding strip. The retaining bar ensures that the upper straightening rollers are extended out of the work area of the straightening machine together with the upper bearing bar and are not pulled out of the bearing bar, for example because they get stuck on their opposite end face in the coupling element of the drive device. In addition, the bearings of the upper straightening rollers in the upper bearing bar are relieved by the holding bar when they are extended, since the holding bar ensures a flow of force from the lower slide plate via the lower bearing bar, the driver device and the upper bearing bar into the upper straightening rollers when the lower slide plate is pulled out becomes.

The interchangeable prism provided according to the invention preferably consists essentially of a frame with at least two roller support strips held in the frame and/or forming parts of the frame. In order to be able to manually insert the interchangeable prism into the straightening gap and remove it from it, it is preferably made of aluminum or some other light metal.

If the retaining bar relative to the upper bearing bar to which it is attached, can be moved in an axial degree of freedom, for example by forcing bolts, the retaining bar can also be used to to push the upper straightening rollers out of the upper bearing bar and pull them back into it.

Figur 1

eine schematische Ansicht des Arbeitsbereichs einer erfindungsgemäß ausgestalteten Richtmaschine, von der Bedienseite;

Figur 2

eine Ansicht wie Figur 1 in einem anderen Verfahrensstadium;

Figur 3

eine isometrische Ansicht eines Beispiels für ein Wechselprisma;

Figur 4

eine Ansicht wie Figur 1, in einem weiteren Verfahrensstadium;

Figur 5

eine isometrische Ansicht eines Beispiels für eine Halteleiste;

Figur 6

eine Ansicht wie Figur 1 in einem weiteren Verfahrensstadium;

Figur 7

ein Ausschnitt aus einer Ansicht wie Figur 1 in einem weiteren Verfahrensstadium;

Figur 8

eine isometrische Ansicht eines Teils der Richtmaschine aus Figur 1, mit ausgefahrener Schieberplatte;

Figur 9

ein Detail aus Figur 8;

Figur 10

das Detail aus Figur 9 in einem späteren Verfahrensstadium und aus einem anderen Betrachtungswinkel;

Figur 11

das Detail aus Figur 9, in einem weiteren Verfahrensstadium;

Figur 12

das Detail aus Figur 9 in einem weiteren Verfahrensstadium;

Figur 13

das Detail aus Figur 9 in einem weiteren Verfahrensstadium.

An exemplary embodiment of a system of straightening machine and maintenance device designed according to the invention, on the basis of which an exemplary embodiment of a method according to the invention is also explained, is described below with reference to the attached drawings. Show it:

figure 1

a schematic view of the working area of a straightening machine designed according to the invention, from the operating side;

figure 2

a view like figure 1 at a different stage of the proceedings;

figure 3

an isometric view of an example of an exchangeable prism;

figure 4

a view like figure 1 , at a further stage of the proceedings;

figure 5

an isometric view of an example of a retaining bar;

figure 6

a view like figure 1 at a further stage of the process;

figure 7

a snippet of a view like figure 1 at a further stage of the process;

figure 8

an isometric view of part of the straightener figure 1 , with slide plate extended;

figure 9

a detail out figure 8 ;

figure 10

the detail out figure 9 at a later stage of the proceedings and from a different perspective;

figure 11

the detail out figure 9 , at a further stage of the proceedings;

figure 12

the detail out figure 9 at a further stage of the process;

figure 13

the detail out figure 9 at a further stage of the process.

figure 1 shows in a side view a detail with the working area 4 of a straightening machine, which is designed as an example according to the present invention. The same view can be found in figures 2 , 4 and 6 , in which the same reference numbers are used for the same elements.

The leveler shown in these figures has an upper roller frame 1 and a lower roller frame 2 held in a frame (not visible here), the upper roller frame 1 being able to move up and down to open and close a leveling gap 3 be able. In the present exemplary embodiment, six upper straightening rollers 5 are arranged in the upper roller mill 1 above the straightening gap 3 , while a total of seven lower straightening rollers 6 are present below the straightening gap 3 in the lower roller mill 2 . Of the upper and lower straightening rollers 5, 6, essentially only their end faces, which are provided with axial coupling elements and point towards the operator side, can be seen in these illustrations.

The upper and lower straightening rollers 5, 6 are arranged offset to one another along the straightening gap 3, i.e. in a working direction 7 from an inlet 8 to an outlet 9 of the working area 4, in such a way that a metal strip (not shown) that is guided by the straightening rollers 5 , 6 is transported from the inlet 8 to the outlet 9, is alternately bent upwards and downwards on the upper and lower straightening rollers 5, 6 in order to eliminate tension and unevenness in the material.

In order to prevent the upper and lower straightening rollers 5, 6 from sagging, these are each equipped with upper support rollers 10 (of which only a small part can be seen) and lower support rollers 11 acting in pairs on each straightening roller 5, 6 in the respective roller mill 1 , 2 supported.

The support rollers 10, 11 are mounted in respective support roller blocks, the lower support roller blocks 14 being visible here only for the lower support rollers 11. These lower support roller blocks 14 are seated on a lower slide plate 15, which can be pulled out of the working area 4 of the straightening machine transversely to the working direction 7, forward in the present illustrations (cf. FIG. 8).

The upper straightening rollers 5 are mounted in an upper bearing bar 12 on the operating side of the straightening machine that is visible here, while the lower straightening rollers 6 are mounted in a lower bearing bar 13 here.

In addition to the lower slide plate 15, the present straightening machine is also equipped with an upper slide plate 16 which, supported by two upper slide plate supports 17, can be pulled out of the working area 4 of the straightening machine. In a corresponding manner, the lower slide plate 15 is also supported by two lower slide plate supports 18 when it is pulled out of the working area 4 of the straightening machine. A detachable safety device 19 each secures the lower and upper slide plates 15, 16 during operation of the straightening machine on the respective roller mill 1, 2.

A driver device 20 is attached to the lower bearing bar 13 at the inlet 8 and also at the outlet 9 , which is equipped with pivotable clamping lugs 21 which serve to couple the upper bearing bar 12 to the lower bearing bar 13 .

In figure 3 an exemplary embodiment of an exchangeable prism 22 present or used according to the invention is shown. This is made of aluminum and essentially consists of a frame 23, which in turn is made up of two side profiles 24, 24' and three roller support strips 25, 25', 25" connecting them". The roller support strips 25 are provided with notches 26 at the top and bottom provided to accommodate straightening rollers, which is why these notches 26 are offset from each other at the top and at the bottom. The lightweight construction of the example of an interchangeable prism 22 shown here allows it to be handled by hand and without additional tools.

figure 5 shows an embodiment of a holding strip 27, which is provided with receptacles 28 for the upper straightening rollers 5 (cf. figure 6 ) is equipped and has two forcing bolts 29 and rotatable anchor plates 31.

In the other figures, the same parts are each provided with identical reference numbers, so that in this respect reference can be made to the previous description.

In order to inspect the upper straightening rollers 5 of the present exemplary embodiment of a straightening machine and to clean or replace them if necessary, the upper slide plate 16 does not have to be pulled out of the working area 4 of the straightening machine according to the invention, but the following example of a method according to the invention can be used instead:
figure 1 shows the starting position, ie the straightening machine, whose working area 4 is shown here in a view of the operating side, is in an operational state. After any necessary removal of straightening material from straightening gap 3, first, as in figure 2 shown, the upper roller mill raised to widen the straightening gap 3. After that it will be in figure 3 exchangeable prism shown is inserted manually into the open straightening gap 3 and the upper roller mill 1 is lowered again until the upper straightening rollers 5 rest on the exchangeable prism 22, more precisely on its roller support strips 25. At the same time, the interchangeable prism 22 rests on the lower straightening rollers 6 . This situation shows figure 4 .

In the figure 5 shown retaining bar 27 is how figure 6 shows plugged with their recordings 28 on the front ends of the upper straightening rollers 5 and the push-off bolts 29 of the retaining strip 27 are screwed into the threaded holes 30 provided for this purpose in the upper bearing strip 12 . The forcing bolts 29 are held on the retaining strip 27 by means of rotatable anchor disks 31 . This connection can be released by rotating the armature disks 31 .

Why then figure 7 shows, the clamping lugs 21 of the driver device 20 are now pivoted and attached to the upper bearing bar 12 in order to couple them to the lower bearing bar 13 to which the driver device 20 is attached. The lower and upper bearing slats 12, 13 are thus fixed to one another by the driver device 20, while the upper straightening rollers 5 are in any case axially free by means of the retaining slat 27 and its push-off bolts 29 on the upper bearing slat 12 (rotation of the upper straightening rollers 5 remains possible). is fixed.

Now the lower slide plate 15, as shown in figure 8 is shown, supported by two lower slide plate supports 18, pulled out transversely to the working direction 7 from the working area 4 of the straightening machine. The lower slide plate 15 carries how figure 8 clearly shows the lower support roller blocks 14 with the lower support rollers 11 and the lower straightening rollers 6 resting thereon, the lower bearing bar 13 also being connected directly to the lower slide plate 15 . When the lower slide plate 15 is pulled out, the lower straightening rollers 6 are thus extended out of the working area 4 of the straightening machine.

Due to the coupling of the upper bearing bar 12 to the lower bearing bar 13 via the driver device 20, as well as because of the axially positive fixing of the upper straightening rollers 5 on the holding bar 27 and thus also on the upper bearing bar 12, and ultimately also because the upper straightening rollers 5 rest on the interchangeable prism 22, which in turn rests on the lower straightening rollers 6, the upper straightening rollers 5 are simultaneously extended from the working area 4 of the straightening machine when the lower slide plate 15 is pulled out and, if necessary, at the Drive side of the straightener released from the corresponding coupling elements.

How based figure 8 immediately obvious, the upper straightening rollers 5 are accessible directly from above and can in particular be inspected without the upper slide plate 16 interfering with this. It is also easy to remove individual upper straightening rollers 5 with the help of a crane after carrying out the following process steps:

As figure 9 shows, the push-off bolts 29 of the retaining bar 27 are screwed into the threaded holes 30, whereby the upper straightening rollers 5 are pushed out of the upper bearing bar 12 axially to the rear because of the axially form-fitting fixation of the upper straightening rollers 5 in the receptacles 28 of the holding bar 27. This situation shows figure 10 .

Thereafter, the armature disks 31 are rotated and the holding strip 27 is removed and the clamping lugs 21 of the driver device 20 are released, after which the in figure 11 situation shown. The upper bearing strip 12 can now be moved freely in the axial direction of the upper straightening rollers 5, so that it can be pulled out to the front, cf. figure 12 13. The upper straightening rollers 5 can now be freely removed individually from above and can in particular be lifted out by means of a crane in order to be able to replace them, for example.

In order to make the straightening machine ready for operation again, the process steps described simply have to be carried out in reverse order.

In order to make the lower straightening rollers 6 accessible, the upper straightening rollers 5 remain in the upper roller mill 1 and the lower pusher plate 15 is pulled out of the working area 4 in the conventional manner.

Claims (12)

1. System consisting of a straightening machine with maintenance device, comprising a straightening machine for straightening a metal strip or planar metal parts,

   having a number of upper straightening rolls (5) in an upper roll mill (1) and a number of lower straightening rolls (6) in a lower roll mill (2),

   wherein the upper and lower straightening rolls (5, 6) are arranged such that they form, in a working area (4), a straightening gap (3) between an infeed (8) and an outlet (9) of the straightening machine, in order to act from above and from below onto the metal strip or metal part to be straightened, and to guide this in a working direction (7) from the infeed (8) to the outlet (9)

   through the straightening machine,

   and having a lower slide plate (15) with which, at an operating side of the straightening machine, the lower straightening rolls (6) can be extended perpendicularly to the working direction (7) out of the working area (4) of the straightening machine and retracted again,

   characterised in that

   as a maintenance device is provided an alternating prism (22) for setting into the straightening gap (3), which is designed such that, it can rest on the lower straightening rolls (6) when the lower slide plate (15) is extended out of the working area (4), and at the same time the upper straightening rolls (6) can rest on the alternating prism (22).
2. System according to claim 1,
   characterised in that
   the upper straightening rolls (5) are mounted at least on the operating side of the straightening machine in an upper bearing bar (12) and the lower straightening rolls (6) are mounted at least on the operating side of the straightening machine in a lower bearing bar (13), wherein the upper and lower bearing bars (12, 13) are fastened releasably in the respective roll mill (1, 2).
3. System according to any of claims 1 or 2,
   characterised in that
   on the lower slide plate (15) are fastened lower support roll frames (14) with lower support rolls (11) mounted therein, on which the lower straightening rolls (6) rest.
4. System according to any of claims 2 or 3,
   characterised in that
   the lower bearing bar (13) is fastened directly or indirectly on the lower slide plate (15).
5. System according to any of claims 2 to 4,
   characterised in that
   an entrainment device (20) is present for coupling the upper bearing bar (12) to the lower bearing bar (13), wherein the entrainment device (20) is fastened particularly on the lower bearing bar (13), on the lower slide plate (15) and/or on the alternating prism (22).
6. System according to claim 5,
   characterised in that
   the entrainment device (20) has pivotable clamping tabs (21) for fastening to the upper bearing bar (12).
7. System according to at least one of claims 2 to 6,
   characterised in that
   a holding bar (27) is present for mounting to the upper bearing bar (12), wherein the holding bar (27) is equipped with cutouts (28) for the upper straightening rolls (5), in order to fix the upper straightening rolls (5) at least in an axial degree of freedom.
8. System according to at least one of claims 1 to 7,
   characterised in that
   the alternating prism (22) consists substantially of a frame (23) having at least two roll bearing bars (25, 25', 25") which are held in the frame (23) and/or form parts of the frame.
9. Method for making straightening rolls accessible for the maintenance of a straightening machine having a number of upper straightening rolls (5) in an upper roll mill (1) and a number of lower straightening rolls (6) in a lower roll mill (2) wherein the upper and lower straightening rolls (5, 6) are arranged such that they form, in a working area (4), a straightening gap (3) between an infeed (8) and an outlet (9) of the straightening machine, in order to act from above and from below onto the metal strip or metal part to be straightened, and to guide this through the straightening machine in a working direction (7) from the infeed (8) to the outlet (9), and having a lower slide plate (15) with which, the lower straightening rolls (6) at an operating side of the straightening machine can be extended perpendicularly to the working direction (7) of the straightening machine out of the working area (4) and retracted again, wherein the upper straightening rolls (5) are mounted at least on the operating side of the straightening machine in an upper bearing bar (12) and the lower straightening rolls (6) are mounted at least on the operating side of the straightening machine in a lower bearing bar (13) and the upper and lower bearing bars (12, 13) are fastened releasably directly or indirectly in the respective roll mill (1, 2), particularly using a system according to at least one of claims 1 to 8, wherein the method has the following method steps:

   - raising the upper roll mill (1) and/or lowering the lower roll mill (2) for widening the straightening gap (3),

   - laying an alternating prism (22) into the widened straightening gap (3) in that it is laid directly or indirectly onto the lower straightening rolls (6),

   - releasing the upper bearing bar (12) from the upper roll mill (1) and laying the upper straightening rolls (5) on the alternating prism (22),

   - releasing the lower bearing roll (13) and/or the lower slide plate (15) from the lower roll mill (2),

   - drawing the lower slide plate (15), together with the alternating prism (22) resting on the lower straightening rolls (6) and the upper straightening rolls (5) resting on the alternating prism (22), out of the working area (4) of the straightening machine.
10. Method according to claim 9, wherein prior to drawing out the lower slide plate (15), the upper bearing bar (12) is coupled to the lower bearing bar (13) in order to guarantee that the upper bearing bar (12) having the upper straightening rolls (5) is drawn out of the working area (4) of the straightening machine together with the lower bearing bar (13), the lower straightening rolls (6) and the lower side plate (15).
11. Method according to any of claims 9 or 10, wherein after drawing out the lower slide plate (15), the upper straightening rolls (5) are released from the upper bearing bar (12) in order to be able to remove individual straightening rolls (5).
12. Method according to claim 11, wherein the releasing of the upper straightening rolls (5) from the upper bearing bar (12) is carried out with the aid of a holding bar (27) which is equipped with cutouts (28) for the upper straightening rolls (5), in which the upper straightening rolls (5) are fixed in at least in an axial degree of freedom, wherein the holding bar (27) is moved relative to the upper bearing bar (12) in an axial degree of freedom in order to release the upper straightening rolls (5) from the upper bearing bar (12).

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