METHOD FOR THE ONLINE DETERMINATION OF AT LEAST ONE ROLLING PARAMETER, AND ROLLING MILL WITH A DEVICE FOR THE ONLINE DETERMINATION OF AT LEAST ONE ROLLING PARAMETER

Abstract

In a method for the online determination of at least one rolling parameter when rolling a rolling material rolled along a rolling line in a rolling mill including at least two rolls on a roll stand, the rolling material is guided past or through at least one measuring device during the rolling, which interacts with a rolling material variable of the rolling material, the rolling material variable being changeable along the length of the rolling material, and outputs a measurement signal, wherein: (i) the measurement signal is transferred into the frequency space, and the rolling parameter is determined from the measurement signal transferred into the frequency space, and/or (ii) a frequency inherent in the change of the rolling material variable is determined from the measurement signal, and the rolling parameter is determined on the basis of the determined frequency.

Claims

1-10. (canceled)

11. A method for the online detection of at least one rolling parameter when rolling a rolled material (20) rolled along a rolling line (13) in a rolling mill (10) comprising at least two rollers (12) on a rolling stand (11) where the rolled material (20) is a rod or a pipe and where rolled material (20) is passed by or passed through at least one measurement device (31) during rolling, which interacts with a varying rolled material parameter of the rolled material (20) along the longitudinal extension (21) of the rolled material (20) and outputs a measurement signal (40), wherein the measurement device (31) measures perpendicular to the rolling line (13) across the circumference of the rolled material (20) in an integrating and/or averaging manner and (i) the measurement signal (40) is transferred to the frequency space and the rolling parameter is detected from the measurement signal transferred to the frequency space (40), and/or (ii) a frequency inherent in the change in the parameter of the rolled material (41) is detected from the measurement signal (40) and wherein the rolling parameter is detected on the basis of the specified frequency (41).

12. The detection method according to claim 11, wherein for the detection of the rolling parameter additionally the circumferential speed, the rotational frequency and/or the rolling speed of at least one of the rollers or a proportional parameter is used.

13. The detection method according to claim 11, wherein at least one of the rollers (12) of the rolling stand (11) is controlled depending on the certain frequency (41) and/or the detected rolling parameter and, if necessary, by the circumferential speed, the rotational frequency and/or the rolling speed of at least one of the rollers (12) or by a proportional parameter.

14. The detection method according to claim 11, wherein the measurement device (31) is stationary in relation to the rolling mill (10) at least during rolling.

15. The detection method according to claim 11, wherein the measurement device (31) comprises an eddy-current sensor and/or an impedance measurement.

16. The detection method according to claim 11, wherein at least two measurement devices (13), preferably one before and one behind the rolling stand (11), are arranged along the rolling line (13).

17. The detection method according to claim 11, wherein the rolled material (20) is metallic.

18. A rolling mill (10) comprising at least two rollers (12) arranged on a rolling stand (11) for rolling rolled material (20) along a rolling line (13) and a device (30) for online detection of at least one rolling parameter, wherein the rolled material (20) is a rod or a pipe and wherein the detection device (30) comprises at least one measurement device (31) which is arranged on the rolling line (13) and that can interact with a varying rolled material parameter of the rolled material (20) along the longitudinal extension (21) of the rolled material and can output a measurement signal (40), wherein the measurement device (31) measures perpendicular to the rolling line (13) across the circumference of the rolled material (20) in an integrating and/or averaging manner and the detection device (30) comprises means (32) for frequency analysis.

19. The rolling mill (10) according to claim 18, wherein a control device (15) for at least one of the rollers (12) is connected to the detection device (30).

20. The rolling mill (10) according to claim 18, wherein the control device (15) and the detection device (30) are connected to each other in a control loop.

21. The rolling mill (10) according to claim 18, wherein the measurement device (31) is stationary in relation to the rolling mill (10) at least during rolling.

22. The rolling mill (10) according to claim 18, wherein the measurement device (31) comprises an eddy-current sensor and/or an impedance measurement.

23. The rolling mill (10) according to claim 18, wherein at least two measurement devices (13), preferably one before and one behind the rolling stand (11), are arranged along the rolling line (13).

24. The rolling mill (10) according to claim 8, wherein the rolled material (20) is metallic.

Description

[0053] The rolling mills 10 shown in FIGS. 1 to 3 each have rolling stands 11 which support rollers 12 and can roll a rolled material 20 in the rolling direction 14 along a rolling line 13.

[0054] Here, rolling mill 10 in accordance with FIG. 1 only comprises such a rolling stand 11, while rolling mills 10 in accordance with FIGS. 2 and 3 each have five such rolling stands 11. In deviating embodiments, other numbers on rolling stands 11 can be provided here, wherein the distances of the rolling stands 11 and the number of rollers 12, which support the respective rolling stands 11, and their arrangement around the rolling line 13 can also be selected differently depending on the specific rolling mill 10.

[0055] The rolling mill 10 of the present exemplary embodiments each comprises a stand 16 on which the rolling stands 11 are held. It is to be understood that depending on the specific rolling mill 10, stand 16 can be designed as a building part, as a rolling stand girder, as a frame or the like.

[0056] For each rolling stand 11, rolling mills 10 comprise a control device 15 by means of which the rollers 12 can be controlled. In this exemplary embodiment, the control devices 15 each comprise adjusting means, via which the rollers 12 can be adjusted perpendicular to the rolling line 13 in order to adapt them to a specific rolling groove or to a certain rolled material 20. In addition, the control devices 15 also include a drive for the rollers 2, so that they can drive the rolled material 20 through the rolling mill 10 along the rolling line 13 in rolling direction 14.

[0057] It is to be understood that, depending on the specific embodiment, the corresponding rolling mill 10 can also comprise otherwise effective control devices 15, for example, for only some of the rollers 12, brakes, cooling, heaters or the like, which can accordingly influence the rolling process. In particular, not all of the rollers 12 have to be driven, but it is conceivable that the rollers 12 can also only run along where applicable.

[0058] Rolling mills 10 are each designed for rolled material 20, which extends in a longitudinal extension 21, which is essentially aligned parallel to rolling line 13. In the specific rolling process, an attempt will be made to align the longitudinal extension 21 of the rolled material 20 as far as possible on the rolling line 13. However, minor deviations cannot be ruled out here due to unavoidable tolerances and, if necessary, due to the cross-section of the rolled material 20.

[0059] Rolling mills 10 can easily be used for sheet or strip-shaped rolled material 20. In the present case, however, rolling mills 10 are designed, in particular, for rod, wire or tubular rolled material 20.

[0060] Rolling mills 10 each have detection devices for the online detection of at least one rolling parameter.

[0061] In this case, the detection device comprises at least one measurement device 31 in each case, which is provided behind a rolling stand 11. In the case of rolling mill 10 shown in FIG. 3, a measurement device 31 is also provided —as an example—in front of the first rolling stand 11 in the rolling direction 14.

[0062] Measurement devices 31 are designed to interact with a varying rolled material parameter of rolled material 20 along the longitudinal extension 21 of the rolled material 20 and to output a corresponding measurement signal 40.

[0063] In the present exemplary embodiment, an impedance measurement is carried out by the measurement devices 31 by a coil aligned perpendicular to the rolling line 13, which surrounds the rolling line 13—and thus also the rolled material 20, if this runs along the rolling line 13. As a result, an impedance measurement can be carried out, which ultimately directly represents a measure for the respective cross-sectional area of the rolled material 20 so that, in this exemplary embodiment, the cross-sectional surface change of the rolled material 20 in its passing of the respective measurement devices 31 or in its passage through the respective measurement devices 31 represents the rolling parameter to be detected. In this cross-sectional area change, the influences of rollers 12 or also of other tools that act or have acted on the rolled material 20 can be found parameter via the longitudinal extension 21 of the rolled material 20.

[0064] It is to be understood that in the case of alternative rolled material 20, other rolled material variables may also be relevant or differently designed measurement devices 31 can be used.

[0065] Via the frequency analysing means 32 of the detection device 30, for example, by the corresponding measurement signal 40, as exemplified in FIG. 4, being transferred into a frequency space, a specific frequency 41 inherent in the change in the parameter of the rolled material, i.e., the cross-sectional area, can be detected.

This frequency, which clearly appears in FIG. 4, can then be used to determine the rolling parameter rolled material velocity vrod of the rolled material 20 according to equation (8) or also the rolling parameter peripheral precession K.sub.f according to equation (3)—for each individual rolling stand 11, insofar as the circumferential speed v.sub.roll of the corresponding rollers 12, which are upstream of the respective measurement device 31, or whose rotational frequency froii is measured accordingly, taking the equation (1) into account. Where applicable, tensile changes or friction coefficient and neutral point changes can also be detected accordingly online.

[0066] It is to be understood that in deviating embodiments a more detailed analysis of the measurement signal 40 can be carried out in order to be able to determine further or alternative rolling parameters. Where applicable, further measurement devices or other measurement devices can also be provided for this purpose.

[0067] It is also conceivable that the measurement signals 40 of the measurement devices 31 are used for further purposes, for which in the exemplary embodiment in FIG. 2 a bus 34 is provided, which connects individual computing units 33, in which the frequency analysing means 32 of the individual rolling stands 11 and an output unit to the control device 15 are respectively converted. As a result, in particular, the measurement signals 40 of a measurement device 31 or the rolling parameters detected by a computing unit 33 can also be made available to other computing units 33.

[0068] In the exemplary embodiment shown in FIG. 3, a central computing unit 33 serves to output signals to the control device 15, while a central frequency analysing means 32, which is separately formed from the computing unit 33, analyses all measurement signals of the measurement devices 31 accordingly.

[0069] It is to be understood that, in different embodiments, combinations, which deviate and are almost arbitrary here, composed of a bus 34, computing units 33 and frequency analysing means 32 can be provided, since it ultimately only depends on the fact that corresponding frequency analysing means 32 and computing units 33 must be available for the respective measurement devices 31.

[0070] It is to be understood that—depending on the specific embodiment of the respective computing unit 33—this can comprise frequency analysing means 32 without further ado. It is also conceivable that a separate computing unit comprises the frequency analysing means 32. It is also conceivable that the signal forwarding of the respective computing unit 33 to the control device 15 or the control devices 15 can be carried out by a separate computing unit 33 or by a computing unit 33 that can be repeatedly or additionally used elsewhere.

TABLE-US-00001 Reference list: 10 rolling mill 11 rolling stand 12 roller 13 rolling line 14 rolling direction 15 control device 16 stand of rolling mill 10 20 rolled material 21 longitudinal extension of rolled material 20 30 detection device 31 measurement device 32 frequency analysing means 33 computing unit 34 bus 40 measurement signal 41 certain frequency