Flatness measurement of an aluminum rolling mill

Abstract

The invention relates to a rolling stand (2) for rolling hot aluminum strip (1), which is arranged in this order on the outlet side with a trimming device (7), a front deflection roll (8), a measuring assembly (9) and a winding device (10). The winding device (10) has a winding machine (11) and a rear deflection roll (12), wherein the rear deflection roll (12) is located upstream of the winding machine (11). The trimming device (7) cuts a portion of the metal strip (1) from both sides of the metal strip (1) such that only the remaining central region of the metal strip (1) is supplied to the downstream devices (8 to 10). The front deflection roll (8) deflects the metal strip (1) from the direct connection line (13) between the rolling stand (2) and the rear deflection roll (12). The measuring assembly has a mechanical excitation device (14) and a measuring device (19). The mechanical excitation device (14) excites the metal strip (1) to mechanically vibrate in the thickness direction thereof. The measuring device (19) detects for a plurality of regions (20) of the metal strip (1) adjacent in the width direction of the metal strip (1) the amplitude of the excited mechanical vibration of the respective region (20).

Description

TECHNICAL FIELD

[0001] The present application is based on a rolling device for an aluminum metal strip,

[0002] - wherein the rolling device has a rolling stand,

[0003] - wherein the rolling device has a winding device arranged at the exit side of the rolling stand, which winding device has a winding machine and a rear deflection roll,

[0004] - wherein the rear deflection roll is arranged between the rolling stand and the winding machine,

[0005] - wherein the rolling device has a measuring assembly arranged between the rolling stand and the rear deflection roll, which is provided for determining the flatness of the metal strip,

[0006] - wherein the measuring assembly has a mechanical excitation device by means of which a mechanical vibration of the metal strip in its thickness direction can be excited,

[0007] - wherein the measuring assembly has a measuring device by means of which the amplitude of the excited mechanical vibration of the respective region of the metal strip can be detected for a plurality of regions of the metal strip adjacent to one another in the width direction. BACKGROUND

[0008] Such a rolling device is known for rolling mills for cold-rolled steel. By way of example only, reference can be made to WO 98 / 38482 Al. The flatness of the metal strip can be determined from the recorded amplitudes of the mechanical vibration of the regions of the metal strip. This is also explained in more detail in the cited WO publication. SUMMARY

[0009] The flatness of the rolled metal strip is an important quality feature when rolling the metal strip. In particular, it must be avoided that the rolled metal strip exhibits a wavy shape after rolling. This problem also occurs in the case of cold rolling of steel and hot rolling of aluminum. However, while the above-described construction of the rolling device is known in the case of cold rolling of steel, such a rolling device cannot be easily used in the case of hot rolling of aluminum. The reasons for this are manifold.

[0010] One of the reasons is that the aluminum strip has different physical properties and thus a different vibration behavior, for example a different natural frequency, compared to a steel strip having the same rolling device geometry. In particular, the natural frequency of the aluminum strip is much lower than the natural frequency of the steel strip. In order to avoid disturbances caused by the natural vibration of the aluminum strip, the frequency of the excited mechanical vibration must be chosen significantly lower in the case of the aluminum strip than in the case of the steel strip. This theoretical possibility of working at a lower frequency proves to be unsuitable for practical reasons.

[0011] Another reason is that after hot rolling of the aluminium strip, the side edges of the aluminium strip need to be trimmed. For this purpose, in the rolling device for hot rolling of aluminium strip material, a trimming device is provided on the exit side of the rolling stand, by means of which a strip of the metal strip is cut off on both sides of the aluminium strip material. However, the cutting process associated with the trimming at least excites mechanical vibrations in the edge region of the aluminium strip. At least in the edge region of the aluminium strip, these vibrations interfere with the correct detection of the excited mechanical vibration amplitude, resulting in incorrect results.

[0012] In order to determine the flatness of the aluminium strip, a contact measurement using a segmented tension measuring roller is necessary. This solution has various disadvantages. For example, there is a risk of scratching or otherwise damaging the surface of the aluminium strip. Furthermore, the measurement is relatively imprecise. The use of a segmented tension measuring roller is also expensive. Finally, there is a risk of damaging the sensors of the segmented tension measuring roller.

[0013] It is the object of the present invention to provide various options by means of which a rolling device of the type mentioned can be modified so that it can be used in a rolling device for hot aluminium strip material.

[0014] According to the invention, a rolling device of the type mentioned above is designed in such a way that:

[0015] - the rolling device has a trimming device arranged on the exit side of the rolling stand, by means of which a strip of the metal strip can be cut off on both sides of the metal strip so that only the remaining middle region of the metal strip is supplied to the rear deflection roller and from there to the winding machine, and

[0016] - the rolling device has a front deflection roller arranged between the trimming device and the measuring device, by means of which the metal strip can be deflected away from the direct connection line between the rolling stand and the rear deflection roller.

[0017] Due to the trimming device, the rolling device must be a rolling device for winding the aluminum strip. Because for other metals - in particular steel - such a trimming device is neither necessary nor usable. By means of the front deflection roll, the metal strip is deflected from the direction of exit of the metal strip from the rolling stand to the direction of transport of the metal strip through the measuring assembly. The deflection itself - i.e. the change of direction itself - is secondary. In particular, the extent of the deflection of the metal strip 1 by the front deflection roll 8 can be relatively small. A deflection of a few degrees is sufficient, for example a deflection of 5° to 10°. However, a greater deflection is also possible. However, the deflection at the front deflection roll achieves two decisive effects. On the one hand, the free play in which the aluminum strip can vibrate is shortened. This is because, due to the front deflection roll, the free path no longer extends from the rolling stand or the trimming device to the rear deflection roll, but only from the front deflection roll to the rear deflection roll. This increases the natural frequency of the aluminum strip in the measuring assembly area. In addition, the vibrations induced in the aluminum strip by the trimming device are dampened by the front deflection roll. The interference caused by the trimming device is thus eliminated or at least largely attenuated.

[0018] The mechanical excitation device can in particular be designed as a suction device by means of which the metal strip can be subjected to a vacuum on one side cyclically. This design is mature, robust and reliable. The average amplitude of the mechanically excited vibrations can be adjusted by varying the degree of air suction. The frequency of the excited mechanical vibrations can be adjusted by varying the frequency of the air suction.

[0019] The measuring device can in particular be designed as a non-contact measuring device by means of which the amplitude of the excited mechanical vibrations of the respective region of the metal strip can be detected without contact. Similar to the design of the mechanical excitation device, this design is also established, solid and reliable.

[0020] The non-contact measuring device can for example have a plurality of electromagnetic excitation devices for inducing eddy currents in the metal strip and at least one electromagnetic receiving device for detecting the amplitude of the mechanical vibrations of the respective region of the metal strip by means of which the strength of the excited eddy currents in the respective region of the metal strip can be detected.

[0021] In particular, the measuring assembly in which the mechanical excitation device and the measuring device are arranged is used in various rolling mills which are appropriately equipped by the company Siemens VAI Metal Technology GmbH in Linz, Austria. At that time, the measuring device product of the company Siemens VAI Metal Technology GmbH was named SI FLAT. Such a measuring assembly is also explained in the WO document mentioned at the beginning.

[0022] Preferably, the front deflector roll can move substantially perpendicular to the direct connection line between the rolling mill stand and the rear deflector roll in the thickness direction of the strip. The degree of movement is preferably such that the front deflector roll does not deflect the strip out of the gap and the connection line between the rear deflector roll in the retracted position, but does so in the extended position. This design particularly enables clean winding initially "unaffected by the front deflector roll and measuring device," and the front deflector roll is placed on the strip and deflected only after winding, i.e., only after reaching a stable state.

[0023] The front deflection roll can preferably be driven from above to the metal strip. In particular, in this case, the front deflection roll does not need to be arranged in the narrow mounting space between the rolling mill stand and the rear deflection roll. Furthermore, this configuration can be more easily retrofitted to existing rolling mills that have not yet been constructed according to the present invention.

[0024] The front deflection roller can be mechanically connected to the measuring assembly, allowing them to move only together. This configuration is particularly advantageous when the front deflection roller and the measuring assembly are located on the same side of the metal strip. This simplifies the mechanical design and requires fewer actuators. This is especially true when the front deflection roller is connected to the measuring device via a pivotally supported lever arm, ensuring that the distance between the measuring assembly and the metal strip (e.g., the connecting line between the front and rear deflection rollers) remains constant as the lever arm pivots while the front deflection roller is driven to the metal strip.

[0025] An intermediate deflection roller can also be arranged between the measuring assembly and the rear deflection roller. This configuration further shortens the free path in the measuring assembly area, which determines the natural frequency of the metal strip.

[0026] The intermediate deflection roller is preferably mechanically connected to the measuring assembly, so that the measuring assembly and the intermediate deflection roller can only move together. In this way, especially when the front deflection roller is also mechanically connected to the measuring assembly, when the units of the measuring assembly, the front deflection roller, and the intermediate deflection roller approach the metal strip, the expected spacing of the mechanical excitation device, the measuring device, and even the metal strip can be automatically ensured.

[0027] The measuring device is preferably water-cooled. This, in particular, allows for adequate cooling of the measuring device, and thus enables the flatness measurement to be performed even when the aluminum strip is very hot.

[0028] The distance between the measuring device and the metal strip can preferably be set between a minimum distance and a maximum distance. This allows for an increase in the distance between the measuring device and the metal strip, especially if necessary. For example, this requirement arises if the water cooling system malfunctions.

[0029] Water cooling, minimum spacing, and maximum spacing are preferably coordinated with each other so that the measuring device can operate continuously with water cooling at the minimum spacing and can also operate continuously without water cooling at the maximum spacing, or at least not be damaged by the heat effect of the hot metal strip. Attached Figure Description

[0030] The above-described properties, features, and advantages of the invention, as well as the ways in which they are realized, will become clearer and more readily understood in conjunction with the following description of embodiments explained in more detail with reference to the accompanying drawings. The figures show:

[0031] Figure 1 A side view of the rolling mill is shown.

[0032] Figure 2 As shown above Figure 1 The rolling equipment in the middle,

[0033] Figure 3 The measuring assembly and two deflection rollers are shown from the side.

[0034] Figure 4 As shown above Figure 3 The measurement components in

[0035] Figure 5 A side view of the rolling mill is shown.

[0036] Figure 6 A side view of the rolling mill is shown, and

[0037] Figure 7 Another measuring component and two deflection rollers are shown. Detailed Implementation

[0038] according to Figure 1 and Figure 2 The rolling apparatus for metal strip 1 has a rolling mill stand 2. The rolling mill stand 2 is... Figure 1 The image shows a six-roll rolling mill stand, which includes an intermediate roll 4 and a support roll 5 in addition to the work roll 3. However, the rolling mill stand 2 can also be designed differently, for example, as a four-roll rolling mill stand, in which only the support roll 5 exists besides the work roll 3. In this case, the support roll 5 would naturally be directly mounted on the work roll 3. Other designs are also feasible, such as a 20-roll rolling mill stand or a 12-roll rolling mill stand.

[0039] Metal strip 1 is hot aluminum strip. Its width b is mostly 100 cm or more (sometimes up to 225 cm or even more) and its temperature is in the range of over 300°C, mostly between 315°C and 350°C. Metal strip 1 is supplied to rolling mill stand 2 along the conveying direction x. Usually, it also exits rolling mill stand 2 along the same conveying direction x. The conveying direction x is usually horizontal or at least nearly horizontal. The conveying speed of metal strip 1 exiting rolling mill stand 2 can be up to 400 m / min, sometimes even slightly higher.

[0040] On the exit side of the rolling mill stand 2 (in this order), a thickness measuring device 6, a trimming device 7, a front deflection roller 8, a measuring assembly 9, and a winding device 10 are arranged. The winding device 10 has a winding machine 11 and a rear deflection roller 12, wherein the rear deflection roller 12 is arranged between the rolling mill stand 2 and the winding machine 11, and more precisely between the measuring assembly 9 and the winding machine 11.

[0041] Another rolling mill stand can be arranged upstream of the entrance side of rolling mill stand 2. Multiple additional rolling mill stands can also be arranged upstream of the entrance side of rolling mill stand 2. For example, the winding device for uncoiling the metal strip 1 can also be arranged directly upstream of rolling mill stand 2. Within the scope of this invention, it is not important which of these designs is given. Therefore, the design of the rolling device on the entrance side of rolling mill stand 2 is not shown in the figures and therefore will not be described in detail.

[0042] After exiting the rolling mill stand 2, the thickness of the metal strip 1 is first detected using a thickness measuring device 6 (at a specific location along the strip width if necessary). Within the scope of this invention, thickness detection is secondary. Therefore, in Figure 2 The thickness measuring device 6 is omitted. For the same reason, the assessment of the detected thickness is not explained in detail.

[0043] Then, using the trimming device 7, a strip of metal strip 1 is cut off from each side of the metal strip 1. Therefore, the remaining central area of ​​the metal strip 1 is supplied only to the following components: the front deflection roller 8, the measuring assembly 9, the rear deflection roller 12, and the winding machine 11. Figure 2 In the image, the cut strips are shown as being wider than they actually are, relative to the central area. In reality, they are typically quite narrow, usually between 1.5cm and 4.0cm.

[0044] The direction of the metal strip 1 is changed by means of two deflection rollers 8 and 12. In particular, the metal strip 1 is deflected away from the direct connection line 13 between the rolling mill stand 2 (more precisely, the roll gap of the rolling mill stand 2) and the rear deflection roller 12 by means of the front deflection roller 8.

[0045] according to Figure 1 and Figure 2The front deflection roller 8 can be driven from above to the metal strip 1. This design is particularly advantageous when the front deflection roller 8 is installed in an existing rolling mill (i.e., a rolling mill that does not yet have the front deflection roller 8).

[0046] Regardless of whether the front deflection roller 8 can be driven to the metal strip 1 from above or below, the front deflection roller 8 can move orthogonally to, or at least substantially orthogonally to, the so-called connecting line 13 and thus along the thickness direction of the metal strip 1. This is in Figure 1 The upper deflector roller 8 is indicated by a double arrow above it. Furthermore, the drive from the front deflector roller 8 to the metal strip 1 can be controlled as needed (i.e., without feedback control) or with feedback control. Depending on the requirements, the drive device for driving the front deflector roller 8 can be, for example, electric, hydraulic, or pneumatic.

[0047] The following is combined Figure 3 and Figure 4 The structure and functional modes of measurement component 9 will be explained in more detail.

[0048] according to Figure 3 The measuring component 9 has a mechanical excitation device 14. With the aid of the mechanical excitation device 14, the metal strip 1 can be excited to mechanically vibrate in its thickness direction. Specifically, Figure 3 Metal strip 1 is drawn with a solid line in the middle position and with a dashed line at the fully deflected position. According to... Figure 3 As shown, the mechanical actuation device 14 can be designed as a suction device, for example. For instance, a suction fan 15 can be installed via a suction opening 16 (see also...). Figure 4 The suction channel 17 draws air from the area between the metal strip 1 and the measuring component 9, thus periodically applying a vacuum to one side of the metal strip 1. The degree to which air is drawn out can be varied by directly driving the suction fan 15 and / or by driving the modulator element 18. When the modulator element 18 is driven, it periodically changes its cross-section and thus the flow resistance of the suction channel 17. The modulator element 18 can, for example, be designed as an oval or elliptical element that rotates within the suction channel 17.

[0049] The frequency of the mechanical vibration of the metal strip 1 is determined by the frequency at which the excitation device 14 excites the metal strip 1 to vibrate. Typically, the frequency is in the range of one or two digits higher or lower in hertz, i.e., between 5 Hz and 30 Hz. This frequency is mostly between 8 Hz and 20 Hz, and 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, air suction is set so that the amplitude of the mechanical vibration of the metal strip 1 is in the range of 50 μm to 200 μm, and particularly in the range of 80 μm to 125 μm.

[0050] The measuring component 9 also has a measuring device 19, by means of which multiple regions 20 of the metal strip 1 (see...) are measured. Figure 2 and Figure 4 This allows for the detection of the corresponding amplitude Ai (where i = 1, 2, ..., n and n = the number of regions 20) of the excited mechanical vibration in the corresponding region 20 of the metal strip 1. Based on... Figure 2 and Figure 4 As shown, when viewed from the width direction of the metal strip 1, regions 20 are adjacent to each other. The total number of eight regions 20 shown is only to be understood as exemplary.

[0051] Based on the determined amplitude Ai, the flatness of metal strip 1 can be determined in a manner and method known per se. KWi is used below to denote the reciprocal of the corresponding amplitude Ai for region 20. Therefore, the following correlation applies to all regions 20.

[0052]

[0053] Furthermore, KW (i.e., without an exponent i) represents the average of the reciprocal KWi:

[0054]

[0055] Therefore, it is possible to determine the relationship based on region 20 of region i.

[0056]

[0057] The deviation бσi of a specific stress σi is determined. The specific stress σi for the i-th region 20 is derived from the average of the specific stress σi determined for each region 20, optionally weighted by the thickness of the corresponding region 20. The smoothness can then be determined from the deviation бσi of the specific stress σi in a manner known per se.

[0058] The evaluation of the determined amplitude Ai or the determination of the flatness of the metal strip 1 is not the subject of this invention. Rather, the subject of this invention is the design of a rolling mill that enables the detection of measured values, based on which the amplitude Ai can be determined.

[0059] The measuring device 19 can be designed in particular as a non-contact measuring device, that is, a measuring device 19 that can detect the amplitude Ai of the excited mechanical vibration of region 20 of the metal strip 1 without contact. For example, the measuring device 19 can have multiple electromagnetic excitation devices 21, by means of which eddy currents are induced in the metal strip 1. In some cases, only a single electromagnetic excitation device 20 may exist. Sometimes multiple electromagnetic excitation devices 21 may exist, which induce eddy currents in multiple regions 20 respectively. Figure 4The measuring device 19 can have such an electromagnetic excitation device 21 for each region 20 of the metal strip 1. The corresponding excitation device 21 can be designed as an excitation coil. The excitation device 21 is applied with an excitation current IA, which can be uniformly or individually set. Figure 4 The application of excitation current IA is shown for only one of the excitation devices 21.

[0060] The excitation current IA has an excitation frequency. The excitation frequency is typically in the range of several kHz, sometimes even in the single-digit MHz range. Eddy currents are induced in the metal strip 1 by the excitation current IA. These eddy currents can be detected and assessed using an electromagnetic receiving device 22. The electromagnetic receiving device 22 is individually assigned to each region 20. At least one electromagnetic receiving device 22 exists for each region 20. The electromagnetic receiving device 22 can be designed as a receiving coil. The electromagnetic receiving device 22 provides the detected sensor current ISi (where the exponent i again represents the corresponding region 20). The magnitude of the corresponding sensor current ISi characterizes the intensity of the eddy current excited in the corresponding region of the metal strip 1. Therefore, the current distance between the corresponding region 20 of the metal strip 1 and the measuring device 19 can be determined, in a manner and method known per se, by the ratio of the corresponding sensor current ISi to (if necessary, the corresponding) excitation current IA. This distance, over time, provides the amplitude Ai of the mechanical vibration of the corresponding region 20 of the metal strip 1. As explained, the flatness of the metal strip 1 can then be inferred from the amplitude Ai.

[0061] To determine the spacing between regions 20, it is necessary to determine the overall sensitivity of all regions 20 or specifically the sensitivity of a particular region 20, i.e., a factor, by which the spacing can be determined from the ratio of the corresponding sensor current ISi to the excitation current IA. This determination of sensitivity can be performed within the testing range.

[0062] The measuring component 9 (particularly the measuring device 19) can withstand harsh operating conditions, especially high-temperature loads caused by the hot metal strip 1, without active cooling. However, the measuring device 19 is typically water-cooled. This allows it to... Figure 4 As can be seen, (relatively cold) cooling water 23 is supplied to the measuring device 19 and the cooling water 23 (after the measuring device 19 has cooled) is discharged from the measuring device 19 again.

[0063] Typically, the distance a between the measuring device 19 and the metal strip 1 is adjustable. The distance a relates to the non-deflection state of the metal strip 1. For example, the measuring device 19 can be movably arranged within the measuring assembly 9, or the measuring assembly 9 can be moved as a whole. The distance a can be adjusted between a minimum distance (e.g., fully extended) and a maximum distance (e.g., fully retracted). At the minimum distance, the measuring device 19 can operate continuously as long as water cooling is running. For example, the operation of water cooling can be monitored. However, if water cooling is not running (e.g., due to its failure), any continued operation of the measuring device 19, or even keeping the measuring device 19 at the minimum distance in many cases, will quickly lead to damage to the measuring device 19. Therefore, when water cooling is not running, the measuring device 19 retracts, preferably to the maximum distance. At the maximum distance, the measuring device 19 will at least not be damaged despite the heat effect of the hot metal strip 1. During operation, the distance a between the measuring device 19 and the metal strip 1 (which is essentially equal to the minimum distance) is typically in the range of a few millimeters, for example, between 2 mm and 5 mm.

[0064] The maximum spacing can be significantly greater than the minimum spacing. In some cases, due to the large spacing, the currently small sensor current ISi is no longer small enough to be meaningfully evaluated, thus making it impossible to determine the mechanical vibration amplitude Ai of region 20 of metal strip 1. However, in some cases, the measuring device 19 can continue to operate (including determining the mechanical vibration amplitude Ai of region 20 of metal strip 1 based on the maximum spacing) despite the existence of the maximum spacing.

[0065] According to Figure 1 and Figure 2 In the design, the front 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, when the front deflection roller 8 and the measuring assembly 9 are arranged on different sides of the metal strip 1, the front deflection roller 8 is typically a device independent of the measuring assembly 9. However, it can be advantageous if the front deflection roller 8 and the measuring assembly 9 are located on the same side of the metal strip 1, according to... Figure 5 As shown, the front deflection roller 8 is mechanically connected to the measuring assembly 9, allowing the two components to move only together. For example, the front deflection roller 8 can be connected to the measuring assembly 9 via a lever arm 24, which is pivotally mounted in a support point 25. By appropriately selecting the support point 25, the distance between the measuring assembly 9 and the metal strip 1 can remain constant as the lever arm 24 pivots. The support point 25 can, for example, coincide with or be adjacent to the axis of rotation of the rear deflection roller 12.

[0066] Of course, the condition that the distance between the measuring component 9 and the metal strip 1 remains constant is only satisfied when the front deflection roller 8 is driven to the metal strip 1. If the front deflection roller 8 is spaced apart from the metal strip 1, the distance between the front deflection roller 8 and the metal strip 1 changes, and therefore the distance between the measuring component 9 and the metal strip 1 also changes.

[0067] In addition, according to Figure 6 As illustrated in the diagram, the intermediate deflection roller 26 can be arranged between the measuring device 9 and the rear deflection roller 12. With this design, the effective length of the mechanical vibration that can be excited by the metal strip 1 can be kept particularly short. Furthermore, the direction in which the metal strip 1 is conveyed between the front deflection roller 8 and the intermediate deflection roller 26 can therefore be set independently of the distance a between the metal strip 1 and the measuring component 9.

[0068] like Figure 7 As shown, the intermediate deflection roller 26 can be mechanically connected to the measuring assembly 9, so that the measuring assembly 9 and the intermediate deflection roller 26 can only move together. Figure 7 As shown, in addition to the intermediate deflection roller 26, the front deflection roller 8 is also mechanically connected to the measuring assembly 9 to form a structural unit, making this design particularly advantageous. In this case, during the initial winding of the metal strip 1, the structural unit consisting of the measuring assembly 9, the front deflection roller 8, and the intermediate deflection roller 26 can be held in the retracted position, allowing the metal strip 1 to be initially wound without problems. After the initial winding, the structural unit is unfolded, causing the front deflection roller 8 and the intermediate deflection roller 26 to deflect the metal strip 1. Since the measuring assembly 9, the front deflection roller 8, and the intermediate deflection roller 26 are combined to form a structural unit, the distance between the measuring device 9 and the metal strip 1 is inevitably and automatically set.

[0069] This invention has many advantages. In particular, it enables the detection of measurements in a simple and reliable manner when winding a hot metal strip 1 made of aluminum, and the flatness of the hot metal strip can be determined from these measurements.

[0070] Reference number list

[0071] 1. Metal strip

[0072] 2 Rolling Mill Stand

[0073] 3 working rolls

[0074] 4 Intermediate Rollers

[0075] 5 support rollers

[0076] 6. Thickness measuring device

[0077] 7. Pruning device

[0078] 8. Front deflection rollers

[0079] 9 Measurement Components

[0080] 10. Winding device

[0081] 11 Winding Machine

[0082] 12 rear deflection rollers

[0083] 13 Connecting wires

[0084] 14 Mechanical excitation device

[0085] 15. Exhaust Fan

[0086] 16 Suction openings

[0087] 17 Suction Channel

[0088] 18 Modulator elements

[0089] 19 Measuring device

[0090] 20 regions

[0091] 21 Electromagnetic excitation device

[0092] 22 Electromagnetic receiving device

[0093] 23 Cooling water

[0094] 24 lever arms

[0095] 25 Support points

[0096] 26 Intermediate deflection rollers

[0097] a Spacing

[0098] Ai amplitude

[0099] b width

[0100] IA excitation current

[0101] ISi sensor current

[0102] x is the direction of teleportation.

Claims

1. A rolling apparatus for a metal strip (1) made of aluminum, - in, The rolling device has a rolling mill stand (2). - The rolling device has a winding device (10) arranged on the exit side of the rolling mill stand (2), the winding device having a winding machine (11) and a rear deflection roller (12). - Wherein, the rear deflection roller (12) is arranged between the rolling mill stand (2) and the winding mill (11), - The rolling device has a measuring assembly (9) arranged between the rolling mill stand (2) and the rear deflection roll (12), the measuring assembly being configured to determine the flatness of the metal strip. - The measuring component (9) has a mechanical excitation device (14) which can excite the metal strip (1) to vibrate mechanically along the thickness direction of the metal strip. - The measuring component (9) has a measuring device (19) that can detect the amplitude of the excited mechanical vibration of a plurality of regions (20) of the metal strip (1) that are adjacent to each other in the width direction of the metal strip (1). Its features are, - The rolling device has a trimming device (7) arranged on the exit side of the rolling mill stand (2), which can cut off a strip of the metal strip (1) from each side, thereby supplying only one remaining middle area of ​​the metal strip (1) to the rear deflection roller (12) and from the rear deflection roller to the winding machine (11), and - The rolling device has a front deflection roller (8) arranged between the trimming device (7) and the measuring assembly (9), by means of which the metal strip (1) can be deflected away from the direct connecting line (13) between the rolling stand (2) and the rear deflection roller (12).

2. The rolling apparatus according to claim 1, characterized in that, The mechanical excitation device (14) is designed as a suction device, by means of which a vacuum can be periodically applied to one side of the metal strip (1).

3. The rolling apparatus according to claim 1, characterized in that, The measuring device (19) is designed as a non-contact measuring device, by means of which the amplitude of the excited mechanical vibration of the corresponding region (20) of the metal strip (1) can be detected without contact.

4. The rolling apparatus according to claim 3, characterized in that, The measuring device (19) has multiple electromagnetic excitation devices (21) for sensing eddy currents in the metal strip (1), and the measuring device has at least one electromagnetic receiving device (22) for detecting the amplitude of the mechanical vibration of the corresponding region (20) of the metal strip (1), by means of which the intensity of the eddy current excited in the corresponding region (20) of the metal strip (1) can be detected.

5. The rolling apparatus according to any one of claims 1 to 4, characterized in that, The front deflection roller (8) is capable of moving substantially perpendicular to the direct connection line (13) between the rolling mill stand (2) and the rear deflection roller (12) in the thickness direction of the metal strip (1).

6. The rolling apparatus according to any one of claims 1 to 4, characterized in that, The front deflection roller (8) can be driven from above onto the metal strip (1).

7. The rolling apparatus according to any one of claims 1 to 4, characterized in that, The front deflection roller (8) is mechanically connected to the measuring component (9) such that the front deflection roller (8) and the measuring component (9) can only move together, and the front deflection roller (8) and the measuring component (9) are located on the same side of the metal strip (1).

8. The rolling apparatus according to claim 7, characterized in that, The front deflection roller (8) is connected to the measuring component (9) via a pivotally supported lever arm (24) such that when the front deflection roller (8) is driven onto the metal strip (1), the distance between the measuring component (9) and the metal strip (1) remains constant as the lever arm (24) deflects.

9. The rolling apparatus according to any one of claims 1 to 4, characterized in that, An intermediate deflection roller (26) is arranged between the measuring component (9) and the rear deflection roller (12).

10. The rolling apparatus according to claim 9, characterized in that, The intermediate deflection roller (26) is mechanically connected to the measuring component (9), so that the intermediate deflection roller (26) and the measuring component (9) can only move together.

11. The rolling apparatus according to any one of claims 1 to 4, characterized in that, The measuring device (19) is water-cooled.

12. The rolling apparatus according to claim 11, characterized in that, The distance (a) between the measuring device (19) and the metal strip (1) can be adjusted between the minimum distance and the maximum distance.

13. The rolling apparatus according to claim 12, characterized in that, The water cooling, the minimum spacing, and the maximum spacing are coordinated with each other so that the measuring device (19) can operate continuously with water cooling in the case of the minimum spacing, and the measuring device can also operate continuously without water cooling in the case of the maximum spacing, or at least not be damaged by the heat effect of the hot metal strip (1).

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