JPH07185626A - Device and method for eliminating roll eccentricity of rolling - Google Patents

Abstract

PURPOSE:To manufacture a roll product with high thickness accuracy by providing facility for roll eccentricity elimination control. CONSTITUTION:Position detectors 7a, 7b are provided at the work sides of backup rolls 3, 4, and position detectors 7c, 7d at the diriving sides of them, and the change component of a backup roll gap is calculated by passing signals from them through computing elements 8, 9. A roll eccentricity detector 11 for a WS which outputs a roll gap correction signal to eliminate the change component and a roll eccentricity detector 12 for a DS are provided corresponding to the rotating position of a backup roll rotating position measuring instrument 10, and the roll gap signals of the roll eccentricity detectors 11, 12 passing through output adjusters 13, 14 are added on respective roll gap signal on the work side and the driving side. Moreover, an automatic plate thickness controller 15, support amplifiers 16, 27, and reduction cylinders 18, 19 are provided, which correct and control the roll gap on a WS side and a DS side independently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll eccentricity removing device which suppresses a change in roll gap caused by eccentricity of reinforcing rolls in a rolling mill.

[0002]

2. Description of the Related Art Conventionally, in rolling mills for rolling steel sheets and the like, fluctuations in the roll gap caused by eccentricity of backup rolls cause fluctuations in plate thickness and tensions, which improve product quality and ensure stable rolling operations. Has become a major disturbance factor. In particular, as a recent trend, when a rolling mill equipped with a hydraulic pressure reduction device having a fast response speed is used, a rolling with high plate thickness accuracy that takes advantage of high-speed responsiveness must be performed unless the roll eccentricity is removed. It becomes difficult to produce products. For this reason, a roll eccentricity removing device applying the principle of the Fourier series expansion has been developed.

In this conventional roll eccentricity removing device, the rolling load of the roll is detected as the sum load of the work side and the drive side, and the change of the roll gap caused by the roll eccentricity is detected from this sum load, and this roll is detected. The same amount of roll gap correction signal that removes the gap change is output to the work side and drive side. This correction signal is input to the roll gap control device for hydraulic pressure reduction or the like to remove the roll eccentricity.

As this load roll eccentricity detection device, several methods have been already proposed, so a detailed description thereof will be omitted. For example, the device disclosed in Japanese Patent Laid-Open No. 60-141321 is as follows. The work side, the total load of the drive side is sampled at the pulse output timing of the pulse generator attached to the upper and lower work rolls respectively, and the relative phase of the upper and lower backup rolls is different based on the rolling load signal. The eccentricity of each roll is calculated based on the value obtained by Fourier-transforming the difference in the eccentricity amount, the rotation angle of the roll calculated using the output of the pulse oscillator, and the relative phase. Detect the condition,
Further, these eccentricity state signals are added to obtain a roll gap correction signal.

[0005]

The above-described conventional roll eccentricity removing device has a problem in the accuracy of detecting the rolling load and cannot effectively exert the eccentricity removing effect. That is, there was a problem that the response speed of the rolling load cell was low and that there was friction between the rolling mill housing and the chock due to the installation location of the rolling load cell, and the accurate rolling load was not transmitted to the rolling load cell. .

The present invention has been made to solve the above problems, and reliably removes roll eccentricity by a system that is not affected by measurement errors of work side and drive side rolling loads caused by roll eccentricity. An object of the present invention is to provide a roll eccentricity removing device for a rolling mill that can be performed.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to position detecting means for detecting the roll positions of the work side and drive side of a reinforcing roll, and the roll deviation of the work side and drive side based on the detected position detection deviations. Roll eccentricity detection means for calculating a change amount of the roll gap caused by the core and outputting a roll gap correction signal for removing the change amount, and output adjusting means for adjusting the magnitude of these roll gap correction signals. , Adding means for recombining the roll gap correction signals of which the magnitudes have been adjusted into the roll gap correction signals of the work side and the drive side respectively, and the roll gaps of the work side and the drive side independently of each other according to these roll gap correction signals. A roll gap control means for controlling It is an butterfly.

[0008]

According to the present invention, the change amount of the roll gap on the work side and the drive side is detected separately by the calculation unit of the roll gap change caused by the position detection of the reinforcing roll and the roll eccentricity detection unit. The roll eccentricity of the reinforcing roll differs between the work side and the drive side, and it is necessary to control both sides separately. Equipped with separate eccentricity removal control devices on both sides, automatic plate thickness control device (A
By correcting the GC) signal, roll eccentricity removal can be independently performed on the work side and the drive side. It is possible to control the roll gap independently on the work side and the drive side by using the roll gap correction signals on the work side and the drive side, respectively. Even if the change amount of the roll gap is different or the phase of the change of the roll gap is different with respect to the rotation angle, the roll eccentricity can be surely removed.

[0009]

FIG. 1 is a block diagram showing the configuration of an embodiment of the invention together with the arrangement of rolls in a rolling mill. As shown in the figure, the rolling material P is rolled by the upper work roll 1 and the lower work roll 2. At this time, the upper backup roll 3 and the lower work roll 2 are provided above the upper work roll 1.
Lower backup rolls 4 are arranged at the lower part of the upper work roll 1 and the lower work roll 2 respectively.
Apply a rolling force to the. A WS load detector (WS means the work side) 5 is mounted on the work side of the upper backup roll 3, and a DS load detector (DS means the drive side) 6 is mounted on the drive side. In the conventional method, the change in roll gap due to roll eccentricity is calculated from the rolling load detected by the detector.

In this embodiment, the WS of the backup roll 3
The change amount of the backup roll gap between the backup rolls on the work side is calculated by the operation unit 8 from the signal of the position change detector 7a of 1) and the signal of the WS position change detector 7b of the backup roll 4. Similarly, on the drive side, the calculator 9 calculates the amount of change in the backup roll gap from the position change detectors 7c and 7d. Although it is desirable to detect the roll gap between the work rolls 1 and 2 as a signal of the change in the roll gap of the rolling mill, it is almost impossible in the hot rolling mill due to the narrow space and poor environment. Further, since the influence of the roll eccentricity due to the work roll is small, a sufficient effect can be exhibited by measuring the change of the backup roll gap this time.

As shown in FIG. 2, the position change detector is installed at a position of the back end of the backup roll which is close to the work roll A, or on the outside of the backup roll chock 20 where the work roll of the backup roll neck is in contact. B is considered. From the environmental point of view, the detector is easy to install in position B. The cause of roll eccentricity, which is the purpose of this measurement, is due to the backup roll neck bearing and the deterioration of the grinding accuracy of the backup roll body.

At the measurement position B, the roll eccentricity due to the backup roll neck bearing can be measured, but that due to the deterioration of the backup roll body grinding accuracy cannot be detected. Since the measurement position A can measure the roll gap change due to the roll eccentricity due to the above two causes, this time the measurement position A
It was carried out in. There are contact type and non-contact type proximity rangefinders (electromagnetic type, acoustic wave type, optical type, etc.) as position fluctuation detectors, but an eddy ammeter proximity type distance meter is adopted to withstand adverse environments such as water and heat. .

A change amount of the roll gap caused by the roll eccentricity of the backup roll is calculated, and a roll gap correction signal for removing the change amount is output according to the rotational position of the backup rotational position measuring machine 10 of WS. A roll eccentricity detection device 11 and a DS roll eccentricity detection device 12 are provided. Furthermore, an output adjuster 13 and an output adjuster 14 that adjust the magnitudes of the roll gap correction signals of the roll eccentricity detection device 11 and the roll eccentricity detection device 12 are connected. The output adjuster 13 adjusts the magnitude of the roll gap correction signal of the WS roll eccentricity detection device 11. Further, the output adjuster 14 adjusts the magnitude of the roll gap correction signal of the DS roll eccentricity detection device 12. On the other hand, the automatic plate thickness controller (AGC) 15 comprehensively controls the plate thickness, and the roll gap signals of the work side and the drive side are output.

Further, the roll gap correction signal of the roll eccentricity detection device which has passed through the output adjusters 13 and 14 is added to the roll gap signals of the work side and the drive side. Then, in order to independently correct the roll gap on the work side and the drive side in accordance with the roll gap correction signals on the work side and the drive side, respectively, the WS servo amplifier 16 and the WS pressure reducing cylinder 18 as the roll gap control means, and the DS A servo amplifier 17 and a DS pressure reduction cylinder 19 are provided and can be controlled independently. As the roll eccentricity detecting device, the same logic as that of the roll eccentricity detecting device using the load used conventionally as an input is used, and the roll gap signal is used instead of the load as an input.

[0015]

As described above, according to the present invention,
The reinforced roll position is directly detected on the work side and the drive side separately, and the roll eccentricity component contained in them is detected by the roll eccentricity detection device based on more accurate data than the conventional load method, and the roll gap is detected. It is converted into a correction signal, the roll gap correction signal is adjusted by the output adjuster, and the roll gap is independently corrected and controlled on the work side and drive side, so the roll gap on the work side changes based on roll eccentricity. Minutes and the change in the roll gap on the drive side are different,
Alternatively, there is an effect that the roll eccentricity can be surely removed even when those phases are different with respect to the rotation angle.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention together with an arrangement of rolls of a rolling mill,

FIG. 2 is a diagram showing an installation place of a position variation detector.

[Explanation of symbols]

 1 Upper work roll 2 Lower work roll 3 Upper backup roll 4 Lower backup roll 5 WS load detector 6 DS load detector 7 Position detector 8, 9 Calculation device 10 Rotation position measuring device 11, 12 Eccentricity detection device 13, 14 Output adjuster 15 Automatic plate thickness controller (AGC) 16 WS servo amplifier 17 DS servo amplifier 18 WS reduction cylinder 19 DS reduction cylinder 20 Backup roll chock 21 Work roll chock A, B Position detector installation location

Claims (2)

[Claims] 1. A position measuring means for measuring positional fluctuations of respective end portions of a work side and a drive side of a reinforcing roll of a multiple rolling mill, a rotating angle measuring means of the reinforcing roll, and a change in roll gap from each position and rotating angle. Roll eccentricity removal of a rolling mill characterized by comprising a hydraulic pressure reduction control device capable of calculating a roll gap correction signal for each work angle and drive side for each rotation angle and controlling the work side and drive side independently. apparatus. 2. A position measuring means for measuring the position variation of each end of the work roll and the drive side of the reinforcing roll of the multiple rolling mill, a rotation angle measuring means of the reinforcing roll, and a change of the roll gap from each position and rotation angle. A method for removing roll eccentricity of a rolling mill, characterized by calculating a roll gap correction signal for each rotation angle for each work side and drive side, and controlling the hydraulic pressure reduction control device independently for the work side and the drive side. .