Measurement of Flatness of a Rolling Train for Aluminum

Abstract

The invention relates to a stand (2) for rolling a hot aluminum strip (1), on the downstream outlet side of which are arranged a trimming device (7), a forward deflection roller (8), a measuring assembly (9) and a winding device (10). The winding device (10) comprises a coiler (11) and a backward deflection roller (12) upstream of it. The trimming device (7) cuts off a part of the strip (1) from both sides so that only the remaining central area of ​​the strip (1) is fed to the downstream devices (8 to 10). The deflection roller (8) deflects the strip (1) away from the direct bond line (13) between the stand (2) and the roller (12). The measuring assembly (9) comprises an excitation device (14) and a measuring device (19). The excitation device (14) excites the strip (1) to vibrate in its thickness direction. The measurement assembly (19) senses the amplitude of the excited mechanical vibration in each of a plurality of regions (20) of the strip (1) that are adjacent to each other in the width direction of the strip (1).

Description

Technical Field

[0001] The present invention originates from a rolling device for an aluminum metal strip, - The rolling device has a rolling stand, - The rolling device has a coiling device arranged on the outlet side of the rolling stand and having a coiler and a rear deflector roller, - The rear deflector roller is arranged between the rolling stand and the coiler, - The rolling device has a measuring assembly arranged between the rolling stand and the rear deflector roller and designated to determine the flatness of the metal strip, - The measuring assembly has a mechanical excitation device excitable to mechanically vibrate the metal strip in its thickness direction, - The measuring assembly has a measuring device capable of detecting the amplitude of the excited mechanical vibration of each region of the metal strip for a plurality of regions of the metal strip adjacent to each other in the width direction of the metal strip.

Background Art

[0002] Such a rolling device is known for a rolling train for cold-rolled steel. By way of example only, WO98 / 38482A1 may be referred to. The flatness of the metal strip can be determined from the detected amplitude of the mechanical vibration of the regions of the metal strip. This is also described in more detail in the aforementioned WO document.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The flatness of a rolled metal strip is an important quality characteristic during the rolling of the metal strip. In particular, it is necessary to avoid the rolled metal strip becoming wavy after rolling. This series of problems also occurs in the case of cold-rolled steel and in the case of hot-rolled aluminum. However, although the design embodiments of the rolling devices described above are known in the context of cold rolling of steel, this type of rolling device cannot be easily used in the hot rolling of aluminum either. There are various reasons for this.

[0005] One reason is that for rolling devices of the same geometry, aluminum strips have different physical properties from steel strips and thus have different vibration behaviors, for example, different natural frequencies. Specifically, the natural frequency of an aluminum strip is significantly lower than that of a steel strip. In order to avoid interference by the natural frequency of the aluminum strip, a significantly lower frequency of the mechanical vibrations excited in the aluminum strip than in the steel strip must be selected. For practical reasons, this theoretical possibility of operating at a lower frequency has proven to be an ineffective solution.

[0006] A further reason is that trimming of the side edges of the aluminum strip is required after hot rolling of the aluminum strip. For this reason, in the case of hot rolling of aluminum strips, trimming devices that cut off the strip of the metal strip on both sides of the aluminum strip are arranged on the outlet side of the rolling stand of the rolling device. However, at least the peripheral region of the aluminum strip is mechanically vibrated as a result of the cutting procedure associated with trimming. These vibrations prevent the correct detection of the amplitude of the mechanical vibrations excited in at least the peripheral region of the aluminum strip, and thus the results are distorted.

[0007] Thus, contact detection using a segmented tension measurement roll is performed for detecting the flatness of the aluminum strip. This solution has various drawbacks. For example, there is a risk of scratching or otherwise damaging the surface of the aluminum strip. Furthermore, the measurement is relatively inaccurate. Additionally, the segmented tension measurement roll is costly. Finally, there is a risk of damaging the sensors of the segmented tension measurement roll.

[0008] The object of the present invention is to realize the possibility of modifying a rolling mill of the type described at the beginning in such a way that the invention can be used in a rolling mill for hot aluminum strips.

Means for Solving the Problem

[0009] This object is achieved by a rolling mill having the features of claim 1. Advantageous design embodiments of the rolling mill are the subject matter of dependent claims 2 to 12.

[0010] According to the present invention, a rolling mill of the type described at the beginning - The rolling mill has a trimming device, which is arranged on the outlet side of the rolling stand and can cut off one strip of the metal strip on both sides in any case so that the only remaining central region of the metal strip is supplied towards the rear deflection roller and from the rear deflection roller to the coiler, - The rolling mill has a front deflection roller, which is arranged between the trimming device and the measuring assembly and can deflect the metal strip from the direct connection line between the rolling stand and the rear deflection roller is designed as such.

[0011] Since there is a trimming device, the rolling device will necessarily be a rolling device that rolls an aluminum strip. This is because this type of trimming device is not required or existent in the case of other metals, especially steel. The metal strip is deflected from the exit direction by the forward deflection roller, whereby the metal strip exits the rolling stand in the conveying direction, and thereby the metal strip passes through the measuring assembly. The deflection itself, and thus the change in direction itself, is not very important. Specifically, the degree to which the metal strip 1 is deflected by the forward deflection roller 8 may be relatively small. A few degrees of deflection, for example, a deflection from 5° to 10° is sufficient. However, a larger deflection is easily possible. However, two decisive effects are achieved by the deflection at the forward deflection roller. On the one hand, the free distance in which the aluminum strip can vibrate becomes shorter. This is because the free distance no longer extends from the rolling stand or the trimming device to the rear deflection roller respectively due to the presence of the forward deflection roller, but only extends from the forward deflection roller to the rear deflection roller. As a result, the natural frequency of the aluminum strip in the region of the measuring assembly increases. Furthermore, these vibrations of the aluminum strip excited by the trimming device are damped by the forward deflection roller. The interference caused by the trimming device thus disappears or at least is significantly attenuated.

[0012] The mechanical excitation device can specifically be configured as a suction device that can be periodically acted upon by a vacuum on one side of the metal strip. This design embodiment is established, robust, and highly reliable. The average amplitude of the mechanical vibrations excited by the vacuum can be set by the degree to which the air suction changes. The frequency of the mechanical vibrations excited can be set by the frequency when the air suction changes.

[0013] The measuring device can specifically be configured as a non-contact operating measuring device that can non-contact detect the amplitude of the excited mechanical vibration of each region of the metal strip. Similar to the design embodiments of the mechanical excitation device, this design embodiment is also established, robust, and highly reliable.

[0014] The non-contact operating measuring device has several electromagnetic excitation devices for inducing eddy currents in the metal strip and, in any case, at least one electromagnetic receiver device that can detect the intensity of the eddy currents excited within each region of the metal strip for detecting the amplitude of the mechanical vibration of each region of the metal strip.

[0015] Specifically, the measuring assembly where the mechanical excitation device and the measuring device are arranged is used in various rolling mills correspondingly equipped by Siemens VAI Metals Technologies GmbH, Linz, Austria. The product name of the measuring assembly by Siemens VAI Metals Technologies GmbH at that time was SIFLAT. This type of measuring assembly is also described in the WO document described at the beginning.

[0016] The forward deflector roller is movable in the thickness direction of the metal strip, preferably substantially perpendicular to the connecting line between the rolling stand and the rear deflector roller. The degree of movement is preferably such that the forward deflector roller does not deflect the metal strip from the connecting line between the rolling gap and the rear deflector roller in the retracted position but deflects it in the deployed position. As a result of this design embodiment, in particular, a clean start of winding can be initially possible "without interference by the forward deflector roller and the measuring assembly", and it can be realized that the forward deflector roller operates on the metal strip and deflects the metal strip only after reaching a stable state after the start of winding.

[0017] The front deflection roller is preferably operable from above on the metal strip. In this case in particular, the front deflection roller does not need to be arranged within the narrow mounting space between the rolling stand and the rear deflection roller. Furthermore, this design embodiment simplifies the retrofitting of existing rolling mills which have not hitherto been designed according to the invention.

[0018] It is possible to mechanically couple the front deflection roller to the measuring assembly such that the front deflection roller and the measuring assembly are only movable conjointly. This design embodiment is particularly advantageous when the front deflection roller and the measuring assembly are arranged on the same side of the metal strip. This can simplify the mechanical structure and reduce the number of required actuators. This applies in particular when the front deflection roller is coupled to the measuring assembly by a lever arm pivotably mounted such that the distance between the measuring assembly and the metal strip (or the line of connection between the front deflection roller and the rear deflection roller) remains constant during pivoting of the lever arm when the front deflection roller operates on the metal strip.

[0019] Furthermore, it is possible to arrange the central deflection roller between the measuring assembly and the rear deflection roller. As a result of this design embodiment, the free distance within the region of the measuring assembly which determines the natural frequency of the metal strip can be made even shorter.

[0020] The central deflection roller is preferably mechanically coupled to the measuring assembly such that the measuring assembly and the central deflection roller are only movable conjointly. In particular when the front deflection roller is additionally mechanically coupled to the measuring assembly, as a result, when the unit consisting of the measuring assembly, the front deflection roller and the central deflection roller is moved towards the metal strip, it can be automatically ensured that the mechanical excitation device and the measuring device are arranged at a desired distance from the metal strip.

[0021] The measuring device is preferably water-cooled. As a result, in particular, the measuring device can be sufficiently cooled, and flatness measurement can be performed by the measuring device even on a very hot aluminum strip.

[0022] The distance between the measuring device and the metal strip is preferably adjustable between a minimum distance and a maximum distance. As a result, the distance between the measuring device and the metal strip can be increased if particularly necessary. Such a requirement may occur, for example, as a result of insufficient water cooling.

[0023] The water cooling, the minimum distance, and the maximum distance are preferably adapted to each other in such a way that the measuring device can operate permanently by water cooling at the minimum distance and can also operate permanently without water cooling at the maximum distance, or at least is not damaged despite the thermal influence of the hot metal strip on the measuring device.

[0024] The above-described features, functions, and advantages of the present invention, as well as the manner in which they are implemented, will become more apparent and more readily understandable when combined with the following description of exemplary embodiments, which will be described in more detail in conjunction with schematic exemplary drawings.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0026] According to FIGS. 1 and 2, the rolling device for the metal strip 1 has a rolling stand 2. The rolling stand 2 in FIG. 1 is shown as a six-high stand, and thus as a rolling stand having intermediate rollers 4 and support rollers 5 in addition to its working rollers 3. However, the rolling stand 2 may have a different configuration, for example, a four-high stand having only support rollers 5 in addition to the working rollers 3. In this case, the support rollers 5 will, of course, be directly supported on the working rollers 3. Other design embodiments are also possible, for example, a 20-roller rolling stand or a 12-roller rolling stand, etc.

[0027] The metal strip 1 is a hot aluminum strip. It usually has a width b of 100 cm or more (in some cases, up to 225 cm or more), and has a temperature within a temperature range exceeding 300 °C, usually between 315 °C and 350 °C. The metal strip 1 is supplied to the rolling stand 2 in the conveying direction x. It typically also exits the rolling stand 2 in the same conveying direction x. The conveying direction x is typically a horizontal direction, or at least substantially horizontal. The transfer speed at which the metal strip 1 exits the rolling stand 2 can be up to 400 m / min, and sometimes may exceed this value somewhat.

[0028] On the outlet side of the rolling stand 2, in this sequence, a thickness measuring device 6, a trimming device 7, a front deflector roller 8, a measuring assembly 9, and a winding device 10 are arranged. The winding device 10 has a coil 11 and a rear deflector roller 12, where the rear deflector roller 12 is arranged between the rolling stand 2 and the coil 11, more specifically, between the measuring assembly 9 and the coil 11.

[0029] The rolling stand 2 on the inlet side can further have upstream rolling stands. A plurality of additional rolling stands may be arranged upstream of the rolling stand 2 on the inlet side. Similarly, the coiling device where the metal strip 1 is unwound is arranged, for example, immediately upstream of the rolling stand 2. Which of these design embodiments is provided is not very important in the context of the present invention. For this reason, the design embodiments of the rolling device on the inlet side of the rolling stand 2 are not shown in the drawings and thus there is no more detailed explanation.

[0030] After the metal strip 1 exits the rolling stand 2, its thickness is first detected (optionally, at specific locations across the strip width) using the thickness measuring device 6. The detection of the thickness is not very important in the context of the present invention. For this reason, the thickness measuring device 6 is not included in the drawing of FIG. 2. For the same reason, the evaluation of the detected thickness will not be described in more detail either.

[0031] Next, one strip of the metal strip 1 is cut off on both sides of the metal strip 1 by the trimming device 7 in any case. In this way, only the remaining central region of the metal strip 1 is supplied to the subsequent elements, namely the front deflection roller 8, the measurement assembly 9, the rear deflection roller 12 and the coiler 11. In FIG. 2, the cut-off strip is shown to be wider than it actually is in relation to the central region. In reality, the strip typically has a relatively small width, typically between 1.5 cm and 4.0 cm.

[0032] The direction in which the metal strip 1 is conveyed is changed in any case by the two deflection rollers 8, 12. Specifically, the metal strip 1 is deflected by the front deflection roller 8 from the direct connection line 13 between the rolling stand 2 (more specifically, the rolling gap of the rolling stand 2) and the rear deflection roller 12.

[0033] According to FIGS. 1 and 2, the forward deflection roller 8 is operable onto the metal strip 1 from above. Embodiments of this design are particularly advantageous when the forward deflection roller 8 is retrofitted to a rolling mill already having a rolling mill, i.e., a rolling mill that does not yet have the forward deflection roller 8.

[0034] However, regardless of whether the forward deflection roller 8 is operable onto the metal strip 1 from above or from below, the forward deflection roller 8 is orthogonal or at least substantially orthogonal to the aforementioned connecting line 13 and is thus movable in the thickness direction of the metal strip 1. This is shown in FIG. 1 by the double-headed arrow above the forward deflection roller 8. Further, the operation of the forward deflection roller 8 onto the metal strip 1 can be performed in a controlled manner (i.e., without feedback control) or in a feedback-controlled manner, depending on the requirements. The drive for the operation of the forward deflection roller 8 can be electrical, hydraulic, or pneumatic, depending on the requirements.

[0035] The configuration and functional mode of the measuring assembly 9 will be described in more detail below in conjunction with FIGS. 3 and 4.

[0036] According to FIG. 3, the measurement assembly 9 has a mechanical excitation device 14. The metal strip 1 can be excited to vibrate mechanically by the mechanical excitation device 14 in its thickness direction. Specifically, in FIG. 3, the metal strip 1 at the central position is depicted by a solid line, and the metal strip 1 at the full deflection position is depicted by a dashed line. The mechanical excitation device 14 according to the illustration in FIG. 3 can be configured, for example, like a suction device. For example, the suction fan 15 can suck air from the region between the metal strip 1 and the measurement assembly 9 by using the suction port 16 (see also FIG. 4) and the suction duct 17, and thus, the metal strip 1 is periodically affected by the vacuum on one side. The degree of air suction can be changed by directly operating the suction fan 15 and / or by operating the modulation element 18. In the case of operating the modulation element 18, the modulation element 18 periodically changes the cross-section and thus the flow resistance of the suction duct 17. The modulation element 18 can be configured, for example, as an oval or elliptical element that rotates within the suction duct 17.

[0037] The frequency at which the metal strip 1 vibrates mechanically is determined by the frequency at which the excitation device 14 excites the metal strip 1 to vibrate mechanically. The frequency is typically within the upper single or lower double digit Hertz range, i.e., between 5 Hz and 30 Hz. In most cases, the frequency is between 8 Hz and 20 Hz, particularly between 10 Hz and 15 Hz. The amplitude of the mechanical vibration of the metal strip 1 can be set by the degree of air suction. In most cases, the air suction is set such that the amplitude of the mechanical vibration of the metal strip 1 is within the range of 50 μm to 200 μm, particularly between 80 μm and 125 μm.

[0038] Furthermore, the measuring assembly 9 has a measuring device 19 that can detect, for a plurality of regions 20 of the metal strip 1 (see FIGS. 2 and 4), the respective amplitudes Ai of the excited mechanical vibrations of each region 20 of the metal strip 1, where i = 1, 2,... n, and n = the number of regions 20. According to the illustration in FIGS. 2 and 4, the regions 20 are adjacent to each other when viewed in the width direction of the metal strip 1. The illustrated number of eight regions 20 in total should be understood as merely an example.

[0039] The flatness of the metal strip 1 can be determined from the determined amplitudes Ai by a method known per se. In the following, the reciprocal value of the respective amplitude Ai of each region 20 is referred to as KWi. Thus, the following correlation applies to all regions 20.

[0040]

Number

[0041] Furthermore, the average value of the reciprocal values KWi is referred to as KW (i.e., without subscript i).

[0042]

Number

[0043] In this way,

[0044]

Number

[0045] The variance δσi of the specific tension σi can be determined for the i-th region 20. The specific tension σi for the i-th region 20 is optionally weighted by the thickness of each region 20 and is derived as the average value of the specific tensions σi determined for the individual regions 20. The flatness can then be determined from the variance δσi of the specific tension σi by a method known per se.

[0046] The evaluation of the determined amplitude Ai or the determination of the flatness of the metal strip 1 is not, in itself, the subject of the present invention. Rather, the subject of the present invention is a design embodiment of a rolling mill enabling the detection of measured values that can determine the amplitude Ai.

[0047] The measuring device 19 can specifically be configured as a non-contact operating measuring device, i.e., a measuring device 19 that can detect the amplitude Ai of the excited mechanical vibrations in the region 20 of the metal strip 1 in a non-contact manner. For example, the measuring device 19 can have several electromagnetic excitation devices 21 that can induce eddy currents into the metal strip 1. In particular cases, it is possible that only a single electromagnetic excitation device 21 is present. In many cases, there can be a plurality of electromagnetic excitation devices 21 that induce eddy currents in any case in a plurality of regions 20. According to FIG. 4, the measuring device 19 can in any case have this type of electromagnetic excitation device 21 for each region 20 of the metal strip 1. Each excitation device 21 can be configured like an excitation coil. The excitation device 21 is acted upon by an excitation current IA that is set either constantly or individually. The action by the excitation current IA is shown in FIG. 4 for only one of the excitation devices 21.

[0048] The exciting current IA has an excitation frequency. The excitation frequency is, in most cases, within the range of several kHz and often even within the single-digit MHz range. Eddy currents are induced in the metal strip 1 by the exciting current IA. The eddy currents can then be identified and detected by the electromagnetic receiver device 22. The electromagnetic receiver device 22 is individually assigned to the region 20. Thus, at least one electromagnetic receiver device 22 is present in each region 20 in any case. The electromagnetic receiver device 22 can be configured like a receiver coil. The electromagnetic receiver device 22 supplies the detected sensor current ISi (where the subscript i also represents each respective region 20). The intensity of each sensor current ISi indicates the characteristics of the intensity of the eddy currents excited in each region of the metal strip 1. The respective current intervals between each region 20 of the metal strip 1 and the measuring device 19 can be determined in a method known per se from the ratio of each sensor current ISi and, as appropriate, each exciting current IA. The time-dependent evolution of this interval is given by the amplitude Ai of the mechanical vibration of each region 20 of the metal strip 1. As already explained, the results related to the flatness of the metal strip 1 can be derived from the amplitude Ai.

[0049] To determine the intervals of the regions 20, it may be necessary to determine the sensitivity for all regions 20 overall or specifically for each respective region 20, i.e., the coefficient by which the interval can be determined from the ratio of each sensor current ISi and the exciting current IA. The determination of this type of sensitivity can be carried out in the context of experiments.

[0050] The measuring assembly 9, specifically the measuring device 19, is capable of withstanding harsh operating conditions, in particular the high thermal stress due to the hot metal strip 1, without active cooling. However, in most cases, the measuring device 19 is water-cooled. In Figure 4, it can be seen that (relatively cold) cooling water 23 is supplied to the measuring device 19 and the cooling water 23 (after cooling the measuring device 19) is discharged from the measuring device 19 again.

[0051] Most typically, the distance a between the measuring device 19 and the metal strip 1 is adjustable. The distance a is related to the non-deflected state of the metal strip 1. For example, the measuring device 19 can be arranged to be movable within the measuring assembly 9, or the measuring assembly 9 can move as one unit. The distance a can be adjusted between a minimum distance (e.g., when fully deployed) and a maximum distance (e.g., when fully retracted). The measuring device 19 can be permanently operated at the minimum distance as long as water cooling is effective. The effect of water cooling can be monitored, for example. However, when the water cooling is not working, e.g., due to a failure, any further operation of the measuring device 19, or even just maintaining the measuring device 19 at the minimum distance in many cases, can often cause extremely rapid damage to the measuring device 19. Therefore, when the water cooling is ineffective, the measuring device 19 is preferably retracted to the maximum distance. Even with the thermal influence of the hot metal strip 1, at the maximum distance, the measuring device 19 is at least not damaged. During operation, the distance a between the measuring device 19 and the metal strip 1 (substantially the same as the minimum distance) is in most cases within the range of a few millimeters, for example, between 2 mm and 5 mm.

[0052] The maximum distance AB can be significantly larger than the minimum distance. In many cases, a larger distance results in a lower sensor current ISi thereafter, to the extent that any meaningful evaluation of the sensor current ISi, and thus the determination of the amplitude Ai of the mechanical vibrations of the region 20 of the metal strip 1, becomes impossible. However, despite the maximum distance, continuous operation of the measuring device 19 (including the determination based on this of the amplitude Ai of the mechanical vibrations of the region 20 of the metal strip 1) may still be possible in some cases.

[0053] In the design embodiment according to FIGS. 1 and 2, the forward deflection roller 8 is arranged above the metal strip 1, while the measuring assembly 9 is arranged below the metal strip 1. In this case, that is, when the forward deflection roller 8 and the measuring assembly 9 are arranged on different sides of the metal strip 1, the forward deflection roller 8 is typically a device independent of the measuring assembly 9. However, when the forward deflection roller 8 and the measuring assembly 9 are arranged on the same side of the metal strip 1, according to the illustration of FIG. 5, it may be advantageous to mechanically connect the forward deflection roller 8 to the measuring assembly 9 so that the measuring assembly 9 and the forward deflection roller 8 can only move together. For example, the forward deflection roller 8 may be connected to the measuring assembly 9 by a lever arm 24 pivotally attached to a support point 25. If the support point 25 is appropriately selected, it can be achieved that the distance between the measuring assembly 9 and the metal strip 1 remains constant when the lever arm 24 pivots. For example, the support point 25 may coincide with the rotation axis of the rear deflection roller 12 or be in the immediate vicinity of this rotation axis.

[0054] The condition that the distance between the measuring assembly 9 and the metal strip 1 remains constant is, of course, satisfied only when the forward deflection roller 8 operates on the metal strip 1. When the forward deflection roller 8 is arranged at a distance from the metal strip 1, the distance of the forward deflection roller 8 from the metal strip 1 changes, and thus the distance of the measuring assembly 9 from the metal strip 1 also changes.

[0055] Furthermore, according to the illustration of FIG. 6, it is possible to arrange a central deflection roller 26 between the measuring assembly 9 and the rear deflection roller 12. The effective length by which the metal strip 1 can be excited to vibrate mechanically can be kept particularly short as a result of this design embodiment. Furthermore, the direction in which the metal strip 1 is conveyed between the forward deflection roller 8 and the central deflection roller 26 can be set independently of the distance a of the metal strip 1 from the measuring assembly 9 as a result.

[0056] As shown in FIG. 7, the central deflection roller 26 can be mechanically connected to the measuring assembly 9 such that the measuring assembly 9 and the central deflection roller 26 are movable only in conjunction with each other. This design embodiment is particularly advantageous when, according to the illustration of FIG. 7, in addition to the central deflection roller 26, the front deflection roller 8 is also mechanically connected to the measuring assembly 9, thus forming a structural unit. In this case, the structural unit consisting of the measuring assembly 9, the front deflection roller 8 and the central deflection roller 26 can be held in a retracted position during the initial winding of the metal strip 1 so that problem-free initial winding of the metal strip 1 is possible. After the initial winding, the structural unit is then deployed such that the front deflection roller 8 and the central deflection roller 26 deflect the metal strip 1. By combining the measuring assembly 9, the front deflection roller 8 and the central deflection roller 26 to form a structural unit, the spacing of the measuring assembly 9 from the metal strip 1 is thus set more necessarily and automatically.

[0057] The present invention has many advantages. The detection of measured values that can determine the flatness of a high-temperature metal strip while winding the high-temperature metal strip from aluminum is made possible in a particularly simple and reliable manner.

Explanation of Reference Numerals

[0058] 1 Metal strip 2 Rolling stand 3 Processing roller 4 Intermediate roller 5 Support roller 6 Thickness measuring device 7 Trimming device 8 Front deflection roller 9 Measuring assembly 10 Winding device 11 Coil 12 Rear deflection roller 13 Bonding line 14 Mechanical excitation device 15 Suction fan 16 Suction port 17 Suction duct 18 Modulation element 19 Measuring device 20 Region 21 Electromagnetic excitation device 22 Electromagnetic receiver device 23 Cooling water 24 Lever arm 25 Support point 26 Central deviation roller a Interval Ai Amplitude b Width IA Excitation current ISi Sensor current x Conveying direction

Claims

1. A rolling device for an aluminum metal strip (1), - The rolling device has a rolling stand (2), - The rolling device has a winding device (10) arranged on the outlet side of the rolling stand (2) and having a coiler (11) and a rear deflection roller (12), - The rear deflection roller (12) is arranged between the rolling stand (2) and the coiler (11), - The rolling device has a measuring assembly (9) arranged between the rolling stand (2) and the rear deflection roller (12) and designated to determine the flatness of the metal strip (1), and - the measuring assembly (9) has a mechanical excitation device (14) that can be excited to mechanically vibrate the metal strip (1) in its thickness direction, - The measuring assembly (9) has a measuring device (19) that can detect the amplitude of the excited mechanical vibration of each region (20) of the metal strip (1) for a plurality of regions (20) of the metal strip (1) adjacent to each other in the width direction of the metal strip (1), In a rolling device, - The rolling device has a trimming device (7), the trimming device (7) is arranged on the outlet side of the rolling stand (2), and the only remaining central region of the metal strip (1) is supplied towards the rear deflection roller (12) and can be separated in any case from both sides of the metal strip so as to be supplied from the rear deflection roller (12) to the coiler (11), and - The rolling device has a front deflection roller (8), the front deflection roller (8) is arranged between the trimming device (7) and the measuring assembly (9), and the metal strip (1) can be deflected from a direct connection line (13) between the rolling stand (2) and the rear deflection roller (12), A rolling device, characterized in that.

2. The mechanical excitation device (14) is configured as a suction device that can be periodically acted upon by a vacuum on one side of the metal strip (1), Characterized in that, The rolling device according to Claim 1.

3. The rolling mill according to claim 1 or 2, characterized in that the measuring device (19) is configured as a non-contact operating measuring device that can detect the amplitude of the excited mechanical vibrations of the respective regions (20) of the metal strip (1) in a non-contact manner.

4. The measuring device (19) has several electromagnetic excitation devices (21) for inducing eddy currents in the metal strip (1), and in any case has at least one electromagnetic receiver device (22) capable of detecting the intensity of the eddy currents excited in the respective regions (20) of the metal strip (1) for detecting the amplitude of the mechanical vibrations of the respective regions (20) of the metal strip (1). characterized by the rolling mill according to claim 3.

5. The front deflecting roller (8) is movable substantially orthogonally to the direct connection line (13) between the rolling stand (2) and the rear deflecting roller (12) in the thickness direction of the metal strip (1). characterized by the rolling mill according to any one of claims 1 to 4.

6. The front deflecting roller (8) is operable from above on the metal strip (1), characterized by the rolling mill according to any one of claims 1 to 5.

7. The front deflecting roller (8) is mechanically connected to the measuring assembly (9) such that the front deflecting roller (8) and the measuring assembly (9) are movable only in conjunction with each other, and the front deflecting roller (8) and the measuring assembly (9) are arranged on the same side of the metal strip (1). characterized by the rolling mill according to any one of claims 1 to 6.

8. The front deflecting roller (8) is connected to the measuring assembly (9) by a pivotable lever arm (24) such that the distance between the measuring assembly (9) and the metal strip (1) remains constant when the lever arm (24) pivots when the front deflecting roller (8) operates on the metal strip (1). characterized by the rolling mill according to claim 7.

9. The central deflecting roller (26) is arranged between the measuring assembly (9) and the rear deflecting roller (12). characterized by the rolling mill according to any one of claims 1 to 8.

10. The central deflection roller (26) is mechanically connected to the measuring assembly (9) such that the central deflection roller (26) can move only in conjunction with the measuring assembly (9). Characterized by the rolling mill according to claim 9.

11. The measuring device (19) is water-cooled. Characterized by the rolling mill according to any one of claims 1 to 10.

12. The distance (a) between the measuring device (19) and the metal strip (1) is adjustable between a minimum distance and a maximum distance. Characterized by the rolling mill according to any one of claims 1 to 11.

13. The water cooling, the minimum distance, and the maximum distance are adapted to each other in such a way that the measuring device (19) can operate permanently by water cooling at the minimum distance and can also operate permanently without water cooling at the maximum distance, or at least is not damaged by the heat influence of the hot metal strip (1) on the measuring device (19). Characterized by the rolling mill according to claim 12 when dependent on claim 11.

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