EP3325186B1 - System and method for removing flatness faults from a metal flat product - Google Patents

Description

The invention relates to a system for eliminating flatness errors of a metallic flat product, in particular a sheet or a strip, comprising a plurality of straightening rollers arranged on opposite sides of the flat product.

Furthermore, the invention relates to a method for eliminating flatness errors of a metallic flat product, in particular a sheet or a strip, using a straightening system.

Flatness errors of a metallic flat product, for example a metal sheet or a strip, are deviations of the large surfaces of the flat product from an ideal, in particular flat, target surface. The flatness errors can occur, for example, in the form of waves or bulges. The flatness of a flat product is an essential quality feature of the flat product. Flatness defects are uneven elongations and compressions in the material structure of a flat product, which arise primarily through a rolling process and / or a heat treatment of the flat product. It is known to use either roller straightening machines or bending presses for eliminating flatness flatness defects.

With roller leveling machines, a continuous straightening process is feasible. For this purpose, a roller leveling machine comprises a plurality of straightening rollers arranged on opposite sides of the flat product to be treated in order to be able to eliminate center and edge waves as well as other flatness errors. A roller leveler works lengthwise and corrects primarily uniaxial flatness errors in the direction of flow of the flat product through the Roller straightener. In the transverse direction, only a limited correction possibility is given.

With bending presses, a discontinuous bending process is carried out in which a press head exerts a force locally on the flat product to correct flatness defects. Due to the local exertion of force flatness errors can be corrected in multi-axis direction. A bending process is associated with a high cost in terms of the positioning of the flat product relative to the press head and thereby with a very low productivity.

The generic WO 2013/135688 A1 discloses a continuous apparatus for straightening metal strip. The device comprises a plurality of straightening rollers arranged on opposite sides of the metal strip to be straightened. Each straightening roller can be assigned in the transverse direction side by side, individually controllable actuators, with which an axial bending curve of the respective straightening roller to optimize the straightening process is adjustable.

EP 2 475 473 B1 relates to a straightening machine for a belt-shaped material, comprising: a rigid lower support from which extends a plurality of vertical uprights arranged on either side of a longitudinal flow axis of the band-shaped material, a lower rigid straightening cartridge, the lower rigid straightening cartridge undergoing operation during operation of the belt Straightening machine supported on the rigid support, an upper straightening cassette, each cassette comprising a plurality of spaced rollers which are rotatably mounted in bearings with axes perpendicular to the longitudinal axis of the material extending axes. In addition, the straightening machine comprises: an upper rigid support connected to the vertical uprights and stably fixed to the upper end of each upright, movable means for fixing the upper ones

Straightening cassette on the upper support, which allow the movement of the upper straightening cassette, means for translationally moving the upper straightening cassette relative to the upper rigid support between a rest position in which the rolls of the upper straightening cassette are removed from the rolls of the lower straightening cassette, and a Directional position in which the rollers of the upper straightening cassette are brought to the rollers of the lower straightening cassette to give the band a wavy path, the means are suitable for moving, the deflection of the upper straightening cassette, by the through the passage of the straightened band conditional release force is caused to compensate.

US 3 156 288 A discloses a leveler with means for tilting work rolls longitudinally (conveying direction through the leveler) and / or in the transverse direction, the work rolls having two cooperating wedge elements which are rotatable relative to each other. An upper roll assembly includes work rolls disposed on a frame and supported by rollers in holders. The distance between the upper roll assembly and a lower roll assembly comprising work rolls and back-up rolls is adjusted via a handwheel which drives screw spindles via tie rods and gears to raise or lower a crosshead carrying the upper roll assembly. The upper work rolls are adjusted by adjusting the back-up rolls by operating the handwheel.

An object of the invention is to make the removal of flatness errors of a metallic flat product, in particular a sheet or a strip, more flexible and simpler and thus more cost-effective.

This object is solved by the independent claims. Advantageous embodiments are particularly in the dependent claims specified.

A plant according to the invention for eliminating flatness defects of a metallic flat product, in particular a sheet or a strip, comprises a plurality of straightening rolls arranged on opposite sides of the flat product, wherein at least two cooperating straightening rolls arranged on opposite sides of the flat product each have at least three axially adjacently disposed, individually engageable Have partial rolls.

By dividing the straightening rollers into individually engageable partial rollers, it is possible, on the one hand, to make the partial rollers such that the respective straightening roller substantially corresponds to a conventional, one-piece straightening roller. As a result, a continuous straightening process can be carried out with the system according to the invention, with which, in particular uniaxial, flatness error of the slab can be corrected in the direction of passage. Alternatively, a discontinuous bending presses can be carried out by a targeted individual employment of the sub-rollers with the system according to the invention, in which the individual sub-rollers can be used as press heads to correct multi-axial flatness error of the flat product can. Further alternatively, by a targeted Einzelanstellung the sub-rollers with the system according to the invention, in particular continuous, combined straightening and bending presses are performed during a single pass of the slab through the system. Here, the sub-rollers as press heads can also act in the transverse direction and at the same time assume a conventional directional function by a superimposed employment. In these three different modes of operation of the system according to the invention, the sub-rollers act directly on the flat product. By selectively influencing the individual employment of each sub-roller both the force generated by the respective sub-roller force, as well as a tilt position of the respective sub-roller to the longitudinal center axis of the respective straightening roller can be adjusted. In particular, the respective sub-roller can be controlled like a press tool of a bending press in order to correct local, in particular multiaxial, flatness errors of the flat product.

The straightening and the bending presses can be carried out by means of a single system according to the invention. Conventionally, this requires two separate systems, namely one for straightening and one for bending presses. Consequently, conventionally, either in a batch operation of a bending press machine in a plurality of axes is bent or uniaxially directed in a continuous operation of a straightening system. Thus, traditionally for the production of an optimal flatness of flat products at least two different types of plant must be maintained, both of which are not always fully utilized. This leads to high investment costs for the two systems and correspondingly high operating costs. In contrast, according to the invention, only a single system according to the invention must be maintained, which is accompanied by a significant reduction of investment costs and operating costs.

Since there are conventionally at least two different systems for eliminating flatness flatness defects, it is necessary to move a flat product from one plant to the other plant. The associated frequent handling operations for moving the flat products entail the additional risk that flatness defects, such as surface defects, occur, which is associated with the production of inferior quality flat products. Again, this can be reliably prevented with the invention, since appropriate handling operations for moving the flat products between different systems are not required.

The system according to the invention may also comprise three or more straightening rollers each having at least three axially adjacently arranged, individually engageable part rollers. Such a straightening roller may also have four or more axially adjacent to each other, individually engageable part rollers.

According to an advantageous embodiment, the sub-rollers of each straightening roller can be actively adjusted in each case via at least one own adjusting unit. The hiring units are designed for this purpose individually, in particular individually, controllable. With such a positioning unit, the respective sub-roller can in particular also be inclined relative to the longitudinal central axis of the respective straightening roller. Here, a combination of force and position control can be used. The pitching rollers of a straightening roller associated with adjusting units can be made jointly via a common Anstelleinheit, which is particularly advantageous in terms of Ansteueraufwands for a single straightening process.

Advantageously, at least one adjusting unit comprises at least one mechanical, electromechanical, pneumatic or hydraulic actuator. Also, at least one adjusting unit may comprise a combination of at least two of these actuator variants.

In accordance with a further advantageous embodiment, at least the adjusting units associated with the axially outer part rollers of one of the two straightening rollers each have at least one pivoting unit with which the respective part roller can be adjusted passively inclined to the longitudinal axis of this straightening roller. In this way, the inclination position of the respective outer part roller can be passively adapted to the bending line set with the cooperating, actively engageable part roller on the opposite side of the flat product, without the need for an active control. As a result, the driving effort is reduced. The swivel unit can pivot the respective sub-roller to allow a running in the direction of passage of the flat product axis. In addition, the pivot unit can enable pivoting of the respective sub-roller about an axis extending transversely to the direction of passage. The pivoting unit may be designed such that upon a pivoting of the respective sub-roller a restoring force is generated by it, with which the sub-roller can be acted upon with force in the direction of its non-pivoted position. In particular, an edge support and surface damage of the flat product by the contact between the end section of the sub-roller and the flat product can be reliably avoided with the pivoting unit.

It is furthermore advantageous if at least one adjusting unit has at least one wedge-lifting unit. As a result, the sub-roller associated with the adjusting unit is continuously and very accurately adjustable. The wedge-lifting unit comprises two wedges with wedge surfaces arranged opposite one another, which can be guided past one another, by means of whose relative movements the employment of the sub-roller takes place.

A further advantageous embodiment provides that at least one part roller is provided at least one axial end portion with an outer diameter reduction. As a result, an edge wear and surface damage of the flat product by the contact between the end portion of the sub-roller and the flat product can be reliably avoided. In addition, the bending function of the sub-roller is intensified. The outer diameter reduction can be made, for example, by tangentially grinding a circumferential radius at the end portion of the sub-roll.

According to a further advantageous embodiment, the cooperating, the partial rollers having straightening rollers are offset with respect to a direction of passage of the flat product through the system or not offset from each other. The co-operating, the partial rolls having straightening rollers may be arranged with respect to the direction of passage of the flat product through the system between conventional continuous straightening rollers. Alternatively, the cooperating, the partial rolls having straightening rollers with respect to the direction of passage of the flat product through the plant conventional straightening rollers upstream or downstream. If the cooperating straightening rollers having the partial rollers are not offset relative to one another with respect to a direction of passage of the flat product, tension-induced tension conditions can be established with the conventional straightening rollers of the system via drives of these straightening rollers.

According to a further advantageous embodiment, the system comprises at least one signal technically connectable to the Anstelleinheiten control and / or control electronics, which is set up to control the Anstelleinheiten depending on the quality and position of the flatness of the flat product such that the plant optionally a straightening, a bending press or a combined straightening and bending presses is feasible. The respective quality and position of the flatness errors can be determined in advance. This can be done in the course of an automated data logging or a manual data logging or simply by an experienced eye of an operator. Quality information from a production planning and control system can also be considered. The control and / or regulating electronics can select the respective mode of operation of the system taking into account information or specifications as well as evaluation criteria on the respective type of error. The selection can alternatively be made by the operating personnel. In the "straightening" mode, the sub-rollers of a straightening roller are synchronized and act as a continuous straightening roller. Alternatively, in the operating mode "straightening", it is possible to dispense with the use of the partial rollers or the correspondingly designed straightening rollers. By the method of "straightening" the flatness of the flat product is only in uniaxial direction, as in a conventional roller straightening machine, improved. In the operation "bending presses" is an isolated operation of the part rolls having straightening rolls according to a conventional bending press. Local, multiaxial flatness errors of the slab are corrected. In the "combined straightening and bending presses" mode, multi-axis straightening takes place in a single production step. The straightening rollers having the partial rollers and the conventional straightening rollers work simultaneously to eliminate the flatness error of the flat product. If the quality of the local flatness defects of the slab requires it, the operation of "bending presses" can be selected during a first pass of the flat product through the plant. Subsequently, or after largely eliminating these local flatness errors, the operating mode "straightening" or "combined straightening and bending presses" can be selected during a further passage of the flat product through the system. For the achievement of an optimum flatness result, there is a number of pitching units available both for the straightening rollers having the partial rollers and for the continuous straightening rollers which can be controlled by reference values of a control. The choice of the respective mode of operation of the plant decides which hiring units have to be controlled. The distribution of individual determined flatness errors of the flat product on the individual adjusting units can be carried out using a straightening model.

Advantageously, the system comprises at least one detectable device which can be connected to the control and / or regulating electronics in order to detect a quality and position of the flatness error of the flat product to be treated with the system or of the system treated with the system. As a result, a subjective flatness evaluation can be replaced by an objective flatness evaluation by the control and / or regulating electronics. The inlet-side detection of the quality and position of the flatness error of the flat product to be treated with the system, which is also required for the choice of the respective operating mode of the system, serves for a preset of the system (feed-forward control). About the outlet detection of quality and position the flatness error of the flat product treated with the system may be provided with a modified setup (feed backward control).

According to a method according to the invention for eliminating flatness defects of a metallic flat product, in particular a sheet or a strip, using a straightening system, a bending press or a combined straightening and bending presses is performed with the straightening system.

With the method, the advantages mentioned above with respect to the system are connected accordingly. In particular, can be used as straightening a plant according to one of the aforementioned embodiments or any combination thereof.

Figur 1:

eine schematische Darstellung eines Ausführungsbeispiels für eine erfindungsgemäße Anlage in einem ersten Anlagenzustand;

Figur 2:

eine schematische Darstellung der in Figur 1 gezeigten Anlage in einem weiteren Anlagenzustand;

Figur 3:

eine schematische Darstellung eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Anlage;

Figur 4:

eine schematische Darstellung eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Anlage;

Figur 5:

eine schematische Darstellung eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Anlage;

Figur 6:

eine schematische Darstellung einer Teilwalze eines weiteren Ausführungsbeispiels für eine erfindungsgemäße Anlage;

Figur 7:

eine schematische Darstellung eines Ausführungsbeispiels für ein erfindungsgemäßes Verfahren; und

Figur 8:

eine schematische Detaildarstellung eines Ausführungsbeispiels für ein Regelungskonzept für eine erfindungsgemäße Anlage.

In the following the invention will be explained by way of example with reference to the attached figures by means of preferred embodiments.

FIG. 1:

a schematic representation of an embodiment of an inventive system in a first state of the system;

FIG. 2:

a schematic representation of in FIG. 1 shown installation in another state of the system;

FIG. 3:

a schematic representation of another embodiment of an inventive system;

FIG. 4:

a schematic representation of another embodiment of an inventive system;

FIG. 5:

a schematic representation of another embodiment of an inventive system;

FIG. 6:

a schematic representation of a sub-roll of another embodiment of an inventive system;

FIG. 7:

a schematic representation of an embodiment of a method according to the invention; and

FIG. 8:

a schematic detail of an embodiment of a control concept for a system according to the invention.

In the figures, identical or functionally identical components are provided with the same reference numerals.

Figures 1 and 2 schematically show possible convex or concave Richtspaltgeometrien to eliminate flatness errors of an unplanned, metallic flat product 2, in particular a sheet or a strip.

The plant 1 comprises a plurality of straightening rollers 3 and 4 arranged on opposite sides of the flat product 2, of which in FIG. 1 only two are shown. The cooperating straightening rollers 3 and 4 shown each have three axially adjacently arranged, individually engageable part rollers 5 and 6, respectively. The sub-rollers 5 and 6 of each straightening roller 3 and 4 are each active on at least one own Anstelleinheit 7 corresponding to the double arrows 8. In FIG. 1 Only the Anstelleinheiten 7 for hiring the sub-rollers 6 are shown. At least one adjusting unit 7 may have at least one mechanical, electromechanical, pneumatic or hydraulic actuator, not shown. The sub-rollers 6 are shown as a solid line in a state in which the actuators do not work. At least one sub-roller 5 or 6 may be provided on at least one axial end portion with an outer diameter reduction, not shown. The cooperating, the sub-rollers 5 and 6 having straightening rollers 3 and 4 may be with respect to a passage direction x of the flat product 2 offset by the system 1 or not offset from each other.

The adjusting units 7 assigned to the axially outer part rollers 6 of the straightening roller 4 each have a pivoting unit 9 with which the respective part rollers 6, as in FIG FIG. 1 shown, passively inclined to the longitudinal central axis 10 of the straightening roller 4 is adjustable. Each pivoting unit 7 comprises a rocker 11 which is pivotally mounted about an axis 12 aligned parallel to the passage direction x of the flat product 2 through the system 1. Furthermore, each pivoting unit 7 comprises two compression springs 13, which each generate a restoring force upon pivoting of the rocker 11 from the position shown, with which the rocker 11 is acted upon in the direction of the position shown with force.

The adjusting units 7 assigned to the axially outer sub-rollers 6 each have a wedge-lifting unit 14 with two wedges 15 and 16, by the relative position of which the respective setting of the respective sub-roller 6 is defined. The adjusting units 7 are jointly employable via a common adjusting unit 17, which has a wedge-lifting system formed by the wedges 18 and 19.

The system 1 comprises a signaling technology with the Anstelleinheiten 7 connectable, not shown control and / or control electronics, which is adapted to control the Anstelleinheiten 7 depending on the respective quality and position of the flatness error of the metallic flat product 2 such that with the system 1 optional a straightening, a bending presses or a combined straightening and bending presses is feasible.

The system 1 can furthermore have at least one detection device (not shown) connectable to the control and / or regulating electronics for detecting a quality and position of the flatness error of the metallic flat product 2 to be treated with the system 1 or treated with the system 1.

FIGS. 3 to 5 show possible integrations of the split straightening rolls (bending press function) in or on a conventional roll straightening machine (Directional function). The plant 1 comprises a plurality of straightening rolls 3, 4 and 20 arranged on opposite sides of the flat product.

Two arranged on opposite sides of the metallic flat product, co-operating straightening rollers 3 and 4 each have at least three axially adjacent to each other, individually engageable, not shown sub-rollers. The sub-rollers of each straightening roller 3 and 4 are each active on at least one not shown own Anstelleinheit. At least one adjusting unit comprises at least one mechanical, electromechanical, pneumatic or hydraulic actuator. At least the adjusting units associated with the axially outer part rollers of one of the two straightening rollers 3 and 4 can each have at least one pivot unit, not shown, with which the respective part roller is passively inclined to the longitudinal center axis 10 of this straightening roller 3 and 4, respectively. At least one adjusting unit may have at least one wedge lifting unit, not shown. At least one sub-roller may be provided on at least one axial end portion with an outer diameter reduction, not shown. These components of Appendix 1, for example, according to the Figures 1 and 2 be trained, so here on the above description to the Figures 1 and 2 is referenced.

The cooperating, the partial rolls having straightening rolls 3 and 4 are offset with respect to a passage direction x of the flat product through the system 1 to each other. The other straightening rollers 20 are correspondingly offset from each other and arranged to the straightening rollers 3 and 4.

The system 1 includes a signal technically connectable to the Anstelleinheiten, not shown control and / or control electronics, which is set up to control the Anstelleinheiten depending on the respective quality and position of the flatness error of the metallic flat product such that with the Appendix 1 optionally straightening, a bending press or a combined straightening and bending presses is feasible.

The system 1 may further include at least one signal technically connectable to the control and / or regulating electronics, not shown detecting means for detecting a quality and position of the flatness of the treated with the system 1 or treated with the system 1 metallic flat product.

FIG. 4 shows a schematic representation of another embodiment of an inventive system 1 for eliminating flatness errors of a metallic flat product, not shown, in particular a sheet or a belt. This Appendix 1 differs from the in FIG. 3 shown embodiment, that four straightening rollers 3 and 4 are present, each having at least three axially adjacent to each other, individually engageable, not shown sub-rollers, and that these straightening rollers 3 and 4 formed by the straightening rollers 20 conventional roller straightening unit with respect to the passage direction x of the metallic Flat product through the system 1 upstream or downstream. Incidentally, the Appendix 1 corresponds to the in FIG. 3 shown embodiment, which is why here to avoid repetition of the above description of FIG. 3 is referenced.

FIG. 5 shows a schematic representation of another embodiment of an inventive system 1 for eliminating flatness errors of a metallic flat product, not shown, in particular a sheet or a belt. This Appendix 1 differs from the in FIG. 4 shown embodiment, that only two cooperating straightening rollers 3 and 4 are present, each having at least three axially adjacent to each other, individually engageable, not shown sub-rollers and with respect to the direction of passage x of the metallic flat product through the system 1 the straightening rollers 20 upstream or downstream are, and that the straightening rollers 3 and 4 with respect to the passage direction x of the metallic flat product through the system 1 are not offset from one another. in the Otherwise, Annex 1 corresponds to the one in FIG. 3 shown embodiment, which is why here to avoid repetition of the above description of FIG. 3 is referenced.

FIG. 6 shows a schematic representation of a part roller 5 and 6 of a further embodiment of an inventive system for eliminating flatness errors of a metallic flat product, not shown, in particular a sheet or a belt. The sub-roller 5 and 6 can in one of the FIGS. 1 to 5 used plants are used. The sub-roller 5 or 6 is provided at both axial end portions each with an outer diameter reduction 21 in the form of a radius for minimizing sheet metal surface defects by edge support.

FIG. 7 shows a schematic representation of an embodiment of an inventive method for eliminating flatness errors of a metallic flat product, not shown, in particular a sheet or a belt, using a straightening unit, not shown, with the optional straightening, a bending presses or a combined straightening and bending presses are performed can. The straightening system can according to one of the in the FIGS. 1 to 6 be shown embodiments.

In step 100, data on the flatness of the metallic flat product to be treated with the straightening system are recorded. In step 200 it is determined whether a bending press is required to eliminate flatness defects of the metallic flat product. In this case, information 300 in the form of specifications or evaluation criteria of flatness errors is taken into account, in particular whether they are edge waves, center waves, bowls or the like. This information 300 may come from tables, process models, or visual capture by an operator. If it is determined in step 200 that no bending press (-) is required, in step 400 the operating mode "straightening" is initiated, in which a single-axis Aligning the metallic flat product by means of the straightening system takes place. Here, part rolls having straightening rollers operated as a continuous straightening rollers or not involved in the straightening process. If, in step 200, a bending press (+) is required, then in step 500 the required amount of deformation is calculated. Subsequently, it is determined in step 600 whether the quality of the flatness error is such that the flatness errors can be corrected in a single pass of the metallic flat product by the straightening system or not. If, in step 600, the flatness errors can be corrected in a single pass of the metallic flat product by the straightening system (+), the method "combined straightening and bending presses" is initiated in step 700. Here, the straightening rollers having the part rollers for correcting multi-axial flatness errors, for example, bowls, and the continuous straightening rollers without partial rollers for correcting waves are used. The straightening rollers having the partial rollers can be controlled superimposed and thereby simultaneously used for correcting waves. If, in step 600, the flatness errors can not be corrected by the straightening system (-) in a single pass of the metallic flat product, the "bending presses" operating mode is initiated in step 800. In this case, multiaxial flatness errors are corrected by means of the straightening rollers having the partial rollers. Subsequently, in step 900, it is determined whether further treatment of the metallic flat product to eliminate flatness defects is required. If so, move to step 100.

FIG. 8 shows a schematic detail of an embodiment of a control concept for a system according to the invention for eliminating flatness errors of a metallic flat product, not shown, in particular a sheet or a belt, given operation of the system.

In step 110, an inlet-side detection of flatness errors of the metallic flat product takes place. The step 110 may include data 210 from a Hot rolling mill, a visual inspection or measurements of the flatness of the metallic flat product to be supplied. Planarity data is generated in step 310. The flatness data is subjected to a flatness error analysis in step 410. Here, the position of the respective flatness error in the width direction and length direction of the metallic flat product and the depth of the respective flatness error are determined. The data from step 410, or optionally, feed-forward control, the data from step 310, is provided to a plant controller and / or controller 510 to set a plant setup. The plant control and / or - regulation 510 then generates control signals 610 for controlling the adjusting units of the straightening rollers 3, 4 or 20 of the system.

In step 710, an outflow-side detection of flatness errors of the metallic flat product can take place. The resulting measurements 810 are subjected to a flatness error analysis in step 910. Here, the position of the respective flatness error in the width direction and length direction of the metallic flat product and the depth of the respective flatness error are determined. In step 920, at least one correction value is determined, which is supplied to the plant control and / or regulation 510.

LIST OF REFERENCE NUMBERS

1

investment

2

flat product

3

straightening roll

4

straightening roll

5

partial roll

6

partial roll

7

adjusting unit

8th

setting direction

9

swivel unit

10

Longitudinal central axis

11

seesaw

12

axis

13

compression spring

14

Wedge lifting unit

15

wedge

16

wedge

17

common hiring unit

18

wedge

19

wedge

20

straightening roll

21

Outside diameter reduction

100

step

110

step

200

step

210

dates

300

information

310

step

400

step

410

step

500

step

510

Plant control and / or regulation

600

step

610

control signals

700

step

710

step

800

step

810

readings

900

step

910

step

920

step

x

Throughput direction

Claims (10)

1. Installation (1) for eliminating planarity faults of a metallic flat product (2), particularly a metal sheet or a strip, comprising a plurality of straightening rollers (3, 4, 20) arranged on opposite sides of the flat product (2), characterised in that at least two cooperating straightening rollers (3, 4) arranged on opposite sides of the flat product (2) each have at least three individually adjustable part rollers (5, 6) arranged axially adjacent to one another.
2. Installation (1) according to claim 1, characterised in that the part rollers (5, 6) of each straightening roller (3, 4) are respectively actively adjustable by way of at least one individual adjusting unit (7).
3. Installation (1) according to claim 2, characterised in that at least one adjusting unit (7) comprises at least one mechanical, electromechanical, pneumatic or hydraulic actuator.
4. Installation (1) according to claim 2 or 3, characterised in that at least the adjusting units (7) associated with the axially outer part rollers (5, 6) of one of the two straightening rollers (3, 4) each comprise at least one pivot unit (9) by which the respective part roller (5, 6) is passively adjustable to be inclined relative to the longitudinal centre axis (10) of this straightening roller (3, 4).
5. Installation (1) according to any one of claims 2 to 4, characterised in that at least one adjusting unit (7) comprises at least wedge lifting unit (14).
6. Installation (1) according to any one of claims 1 to 5, characterised in that at least one part roller (5, 6) is provided at at least one axial end section with an outer diameter reduction (21).
7. Installation (1) according to any one of claims 1 to 6, characterised in that the cooperating straightening rollers (3, 4) comprising the part rollers (5, 6) are arranged to be offset or not offset relative to one another with respect to a transit direction (x) of the flat product (2) through the installation (1).
8. Installation (1) according to any one of claims 1 to 7, characterised by at least one electronic control and/or regulating system which is connectible in terms of signalling with the adjusting units (7) and which is arranged to so control the adjusting units (7) in dependence on the respective quality and position of the planarity faults of the flat product (2) that straightening, bending-pressing or combined straightening and bending-pressing can be selectably carried out by the installation (1).
9. Installation (1) according to claim 8, characterised by at least one detecting device, which is connectible with the electronic control and/or regulating system in terms of signalling, for detecting a quality and position of the planarity errors of the flat product (2) which is to be treated by the installation (1) or which is treated by the installation (1).
10. Method for eliminating planarity faults of a metallic flat product (2), particularly a metal sheet or a strip, with use of a straightening installation (1), characterised in that bending-pressing or combined straightening and bending-pressing is performed by the straightening installation (1).

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