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 cold-rolling metal products, comprising: a rack for supporting a lower working roll (5) and an upper working roll (4), at least one back-up roll (10) for supporting the lower working roll (5), a readjusting device (13) positioned on a lower section of the rack beneath the at least one back-up roll for pass-line adjustment and for adjusting a height of the at least one back-up roll (10), a working roll adjustment unit mounted at a top section of the rack for selectively forming a gap between the lower and upper working rolls, and at least one actuator (16) mounted on the lower section of the rack for damping vibrations of the roll stand (2), the back-up roll (10) being supported at opposite ends thereof by respective bearing units (11) provided on the rack, wherein the back-up roll (10) is supported on the at least one actuator (16) by at least one of the bearing units (11), and wherein the at least one actuator (16) is supported below the respective bearing unit (11) directly on the lower section (17) of the rack (8) or indirectly on the lower section of the rack by the readjusting device (13).

2. The roll stand (2) according to claim 1, wherein the at least one actuator (16) is a piezomechanical actuator or a piezohydraulic actuator.

3. The roll stand (2) according to claim 1, wherein the at least one actuator (16) is set up for acquiring rolling forces.

4. The roll stand (2) according to claim 1, wherein the at least one actuator includes first and second actuators (16), wherein the respective bearing units (11) of the back-up roll (10) are supported, respectively, on the first and second actuators (16), and the first and second actuators (16) are supported on a respective section (17) of the rack (8) either directly or indirectly via at least one adjusting wedge (14) of the readjusting device (13).

5. The roll stand (2) according to claim 1, further comprising 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, wherein the at least one vibration sensor (18) is arranged on a section (19) of the rack (8) which is arranged opposite the lower section (17) of the rack (8).

7. The roll stand (2) according to claim 5, wherein the at least one vibration sensor (18) is set up to acquire vibrations in a frequency range from 0.5 Hz to 2000 Hz.

8. The roll stand (2) according to claim 5, wherein the at least one vibration sensor (18) is an acceleration sensor.

9. A roll stand according to claim 1, further comprising an intermediate roll, wherein the back-up roll supports the intermediate roll.

10. A roll stand according to claim 1, wherein the at least one actuator is supported on an adjusting wedge of the readjusting device (13).

11. A rolling system (1) for cold rolling metal objects, comprising: at least one roll stand (2) and at least one system (3) for actively damping vibrations in the at least one roll stand, wherein the at least one roll stand (2) comprises: a rack having a lower working roll (5) and an upper working roll, at least one back-up roll (10) for supporting the lower working roll (5), a readjusting device (13) positioned on a lower section of the rack beneath the back-up roll for pass-line adjustment and for adjusting height of the at least one back-up roll (10), a working roll adjustment unit mounted at a top section of the rack for selectively forming a gap between the lower and upper working rolls, at least one actuator (16) for selectively damping vibrations of the roll stand (2), wherein the back-up roll (10) is supported at opposite ends thereof by respective bearing units (11) provided on the rack, the back-up roll (10) being supported on the at least one actuator (16) by one of the bearing units (11), and the at least one actuator (16) being supported below the respective bearing unit (11) directly on the lower section (17) of the rack (8) or indirectly by at least one component (14) of the readjusting device (13), at least one vibration sensor arranged on the rack (8) for acquiring the vibrations of the roll stand (2), and the at least one system (3) comprising at least one electronic controller in electronic communication with the at least one vibration sensor (18) and with to the at least one actuator (16), wherein vibration signals generated by the at least one vibration sensor (18) are evaluated for generation of control signals, and the at least one electronic controller selectively transmits the control signals to actuate the at least one actuator (16) for introduction of counter-vibrations into the roll stand (2).

12. The rolling system (1) according to claim 11, wherein the at least one electronic controller (20) which is of modular construction is set up for online monitoring of the vibrations of the roll stand (2), for 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).

13. The rolling system (1) according to claim 11, wherein the at least one electronic controller (20) is set up to determine frequencies, amplitudes and/or phase positions of the counter-vibrations to be generated.

14. The rolling system (1) according to claim 11, wherein the electronic controller (20) is set up to generate control signals taking into consideration a transmission behavior of the at least one vibration sensor (18), of the at least one actuator (16) and/or of the roll stand (2).

15. The rolling system (1) according to claim 11, wherein the at least one electronic controller (20) is set up to react to temporal changes of characteristics of the at least one actuator (16) and/or of a controlled system used.

16. A roll stand according to claim 11, wherein the at least one component (14) of the readjusting device (13) includes an adjusting wedge.

17. A method for actively damping vibrations in a roll stand (2) for cold-rolling a metal product, wherein the vibrations in the roll stand (2) are acquired, and counter-vibrations counteracting the vibrations are generated, the method comprising: supporting a lower back-up roll on at least one actuator (16) via at least one bearing unit (11) which supports the lower back-up roll on a rack (8) of the roll stand (2), wherein the at least one actuator (16) is supported directly on a lower section (17) of the rack (8) or indirectly on the lower section of the rack via a readjusting device (13); adjusting a height of the lower back-up roll exclusively with the readjusting device for pass line adjustment of the roll stand (2); initiating the cold-rolling of the metal product; generating the counter-vibrations of at least one actuator (16), and introducing the counter-vibrations into the lower back-up roll (10) for supporting a work roll (5) and/or an intermediate roll of the roll stand (2).

18. The method according to claim 17, wherein the at least one actuator (16) is used for the acquisition of rolling forces.

Description

(1) 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:

(2) FIG. 1: shows a diagrammatic and perspective view of an embodiment example for an inventive rolling system; and

(3) FIG. 2: shows a diagrammatic and perspective detail view of the roll stand of the rolling system shown in FIG. 1.

(4) 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.

(5) 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 back-up roll 9 supporting the upper working roll 4 and a lower back-up 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 back-up 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.

(6) 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 back-up 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 back-up 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 rack cross head. Thus, the load cells, not shown, located conventionally at this installation site are replaced by the actuators 16.

(7) 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.

(8) 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.

(9) 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.

(10) 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.

(11) 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

(12) 1 Rolling system

(13) 2 Roll stand

(14) 3 System

(15) 4 Upper working roll

(16) 5 Lower working roll

(17) 6 Rolling gap

(18) 7 Bearing unit

(19) 8 Rack

(20) 9 Upper supporting roll

(21) 10 Lower supporting roll

(22) 11 Bearing unit

(23) 12 Adjusting unit

(24) 13 Readjustment device for pass line adjustment of wedge adjustment type

(25) 14 Component of the readjustment device in the form of an adjusting wedge

(26) 15 Setting device

(27) 16 Actuator

(28) 17 Lower section of 8

(29) 18 Vibration sensor

(30) 19 Upper section of 8

(31) 20 Control electronics

(32) 21 Signal amplifier