ROLL STAND, ROLLING SYSTEM AND METHOD FOR ACTIVELY DAMPING VIBRATIONS IN A ROLL STAND

Abstract

The invention relates to a roll stand (2) for rolling, in particular cold-rolling, metal products, comprising at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one supporting roll (10) which is non-adjustable or can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2) for supporting a working roll (5) and/or intermediate roll of the roll stand (2), wherein the supporting roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2). In order to enable an optimal active damping of vibrations in a roll stand (2) of this type with low engineering effort, the invention proposes that the supporting roll (10) is supported on the actuator (16) via at least one bearing unit (11) and that the actuator (16) is supported on a section (17) of the rack (8) either directly or indirectly via at least one component (14) of the readjustment device (13)

Claims

1. A roll stand (2) for rolling, in particular cold-rolling, metal products, comprising at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one back-up roll (10) for supporting a working roll (5) and/or intermediate roll of the roll stand (2), which can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2) or which is non-adjustable, wherein the supporting roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2), characterized in that the supporting roll (10) is supported on the actuator (16) via at least one bearing unit (11) and that the actuator (16) is supported on a section (17) of the rack (8) directly via at least one component (14) of the readjustment device (13) or indirectly.

2. The roll stand (2) according to claim 1, characterized in that the actuator (16) is a piezomechanical actuator or a piezohydraulic actuator.

3. The roll stand (2) according to claim 1, characterized in that the actuator (16) is set up for acquiring rolling forces.

4. The roll stand (2) according to claim 1, characterized by at least two corresponding actuators (16), wherein the bearing units (11) of the supporting roll (10) are in each case supported on an actuator (16) and the two actuators (16) are in each case supported on a section (17) of the rack (8) either directly or indirectly via at least one adjusting wedge (14) of the wedge adjustment (13).

5. The roll stand (2) according to claims 1, characterized by at least one vibration sensor (18) arranged on the rack (8) for acquiring the vibrations of the roll stand (2).

6. The roll stand (2) according to claim 5, characterized in that the vibration sensor (18) is arranged, with respect to a rolling gap (6) formed between the cooperating working rolls (9, 10) of the roll stand (2), on a section (19) of the rack (8), which is arranged opposite the section (17) of the rack (8) on which the actuator (16) or the component of the adjustment device (14) is supported.

7. The roll stand (2) according to claim 5 or 6, characterized in that the vibration sensor (18) is set up to acquire vibrations in a frequency range from approximately 0.5 Hz to approximately 2000 Hz.

8. The roll stand (2) according to claims 5, characterized in that the vibration sensor (18) is an acceleration sensor.

9. A rolling system (1) for rolling, preferably cold-rolling, metal objects, comprising at least one roll stand (2) and at least one system (3) for actively damping vibrations in the roll stand (2), wherein the roll stand (2) comprises at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one back-up roll (10) for supporting a working roll (5) and/or intermediate roll of the roll stand (2), which can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2) or which is non-adjustable, wherein the supporting roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2), and is characterized in that the supporting roll (10) is supported on the actuator (16) via at least one bearing unit (11) and that the actuator (16) is supported on a section (17) of the rack (8) directly via at least one component (14) of the readjustment device (13) or indirectly, wherein at least one vibration sensor (18) is arranged on the rack (8) for acquiring the vibrations of the roll stand (2), and wherein the system (3) comprises at least one control electronics (20) which is connected by signal technology to the vibration sensor (18) and to the actuator (16), by means of which vibration signals generated by the vibration sensor (18) can be evaluated for the generation of control signals, and which is set up to actuate the actuator (16) for the introduction of counter-vibrations into the roll stand (2) by means of the respective control signals.

10. The rolling system (1) according to claim 9, characterized in that the control electronics (20) which is of modular construction is set up for the online monitoring of the vibrations of the roll stand (2), for the online visualization of vibration levels of the vibrations of the roll stand (2), for the automatic start-up of at least one low-vibration rolling speed and/or for the automatic reduction of an instantaneous rolling speed as a function of the instantaneously acquired vibrations of the roll stand (2).

11. The rolling system (1) according to claim 9, characterized in that the control electronics (20) is set up to determine frequencies, amplitudes and/or phase positions of the counter-vibrations to be generated.

12. The rolling system (1) according to claim 9, characterized in that the control electronics (20) is set up to generate the control signals taking into consideration a transmission behavior of the vibration sensor (18), of the actuator (16) and/or of a rolling mill of the roll stand (2).

13. The rolling system (1) according to claim 9, characterized in that the control electronics (20) is set up to react to temporal changes of characteristics of the actuator (16) and/or of a controlled system used.

14. A method for actively damping vibrations in a roll stand (2) for rolling, in particular cold-rolling, metal products, wherein the vibrations in the roll stand (2) are acquired, and counter-vibrations counteracting the vibrations are generated, wherein the counter-vibrations are generated by means of at least one actuator (16), characterized in that the counter-vibrations are introduced into at least one supporting roll (10) for supporting a work roll (5) and/or intermediate roll of the roll stand (2) and which can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2), or which is non-adjustable which supporting roll is supported on the actuator (16) via at least one bearing unit (11), via which it is guided on a rack (8) of the roll stand (2), wherein the actuator (16) is supported on a section (17) of the rack (8) directly via at least one component (14) of the readjustment device (13) or indirectly.

15. The method according to claim 14, characterized in that the actuator (16) is used for the acquisition of rolling forces.

Description

[0040] Below, the invention is explained as an example in reference to the appended figures based on a preferred embodiment, wherein the features explained below can represent an aspect of the invention, both taken alone and also in different combination with one another. In the figures:

[0041] FIG. 1: shows a diagrammatic and perspective view of an embodiment example for an inventive rolling system; and

[0042] FIG. 2: shows a diagrammatic and perspective detail view of the roll stand of the rolling system shown in FIG. 1.

[0043] FIG. 1 shows a diagrammatic and perspective view of an embodiment example for an inventive rolling system 1 for rolling, in particular cold rolling, metal objects. The rolling system 1 comprises a roll stand 2 and a system 3 for active damping of vibrations in the roll stand 2.

[0044] The roll stand 2 comprises an upper working roll 4 and, cooperating therewith, a lower working roll 5, between which a rolling gap 6 is formed. The working rolls 4 and 5 are in each case guided at their ends via a respective bearing unit 7 on a respective rack 8 of the roll stand 2. Moreover, the roll stand 2 comprises an upper supporting roll 9 supporting the upper working roll 4 and a lower supporting roll 10 supporting the lower working roll 5. The supporting rolls 9 and 10 are in each case guided at their ends via a respective bearing unit 11 on a respective rack 8 of the roll stand 2. The roll stand 2 moreover comprises two adjusting units 12 arranged on a respective rack 8, for the adjustment of the upper working roll 4 together with the upper supporting roll 9 and for setting the height of the rolling gap 6. In addition, the adjusting units 12 are used for generating the respective rolling forces. Furthermore, the roll stand 2 comprises a wedge adjustment 13 arranged on the racks 8, with an adjusting wedge 14 and a setting device 15 actuating the adjusting wedge 14.

[0045] The roll stand 2 comprises two actuators 16 which can be actuated for active damping of vibrations in the roll stand 2. Moreover, the roll stand 2, as explained above, comprises the lower supporting roll 10 which can be adjusted exclusively via the wedge adjustment 13 of the roll stand 2 for supporting the lower working roll 5 of the roll stand 2. The lower supporting roll 10 is supported via the bearing units 11 in each case on one of the two actuators 16. The actuators 16 are supported indirectly via the adjusting wedge 14 of the wedge adjustment 13 on a section 17 of the respective rack 8, wherein the respective section 17 is a lower rackcross-head. Thus, the load cells, not shown, located conventionally at this installation site are replaced by the actuators 16.

[0046] The actuators 16 are each formed as a piezomechanical actuator or as a piezohydraulic actuator. The actuators 16 can be set up for acquiring rolling forces, which makes it possible to dispense with conventional load cells.

[0047] The roll stand 2 moreover comprises two vibration sensors 18 arranged on a respective rack 8, for acquiring the vibrations of the roll stand 2. Each vibration sensor 18 is arranged with respect to the rolling gap 6 on a section 19 of the respective rack 8 which is arranged opposite the section 17 of the respective rack 8 on which the adjusting wedge 14 is supported. The section 19 is formed by an upper rack cross-head of the respective rack 8. Each vibration sensor 18 can be set up to acquire vibrations in a frequency range from approximately 0.5 Hz to approximately 2000 Hz. Each vibration sensor 18 can be an acceleration sensor.

[0048] The system 3 comprises a control electronics 20 connected by signal technology to the vibration sensors 18 and to the actuators 16, by means of which control electronics the vibration signals generated by the vibration sensors 18 can be evaluated for the generation of control signals, and which is set up to actuate the actuators 16 for the introduction of counter-vibrations into the roll stand 2 by means of the respective control signals. Moreover, the system 3 comprises a signal amplifier 21 for amplifying the control signals to be supplied to the actuators 16.

[0049] The control electronics 20 can be set up for the online monitoring of the vibrations of the roll stand 2, for the online visualization of vibration levels of the vibrations of the roll stand 2, for the automatic start-up of at least one low-vibration rolling speed and/or for the automatic reduction of an instantaneous rolling speed as a function of the instantaneously acquired vibrations of the roll stand 2. Moreover, the control electronics 20 can be set up for determining the necessary frequencies, amplitudes and/or phase positions of the counter-vibrations to be generated. In addition, the control electronics 20 can be set up to generate the control signals taking into consideration a transmission behavior of the vibration sensors 18, of the actuators 16 and/or of a rolling mill of the roll stand 2, which is formed by the rolls 4, 5, 9 and 10. Furthermore, the control electronics 20 can be set up to react to temporal changes of characteristics of the actuators 16 and/or of a controlled system used.

[0050] FIG. 2 shows a diagrammatic and perspective detail representation of the roll stand 2 of the rolling system shown in FIG. 1. In particular, the arrangement of the actuators 16 on the adjusting wedge 14 of the wedge adjustment 13 can be seen better, adjusting wedge which is supported on the lower sections 17 of the racks 8. For the rest, to avoid repetitions, reference is made to the above description of FIG. 1.

LIST OF REFERENCE NUMERALS

[0051] 1 Rolling system

[0052] 2 Roll stand

[0053] 3 System

[0054] 4 Upper working roll

[0055] 5 Lower working roll

[0056] 6 Rolling gap

[0057] 7 Bearing unit

[0058] 8 Rack

[0059] 9 Upper supporting roll

[0060] 10 Lower supporting roll

[0061] 11 Bearing unit

[0062] 12 Adjusting unit

[0063] 13 Readjustment device for pass line adjustment of wedge adjustment type

[0064] 14 Component of the readjustment device in the form of an adjusting wedge

[0065] 15 Setting device

[0066] 16 Actuator

[0067] 17 Lower section of 8

[0068] 18 Vibration sensor

[0069] 19 Upper section of 8

[0070] 20 Control electronics

[0071] 21 Signal amplifier