JP2006142350A - Controller of eccentricity of roll in rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a roll eccentricity controller in a rolling mill with which the roll eccentricity is accurately controlled without taking a lot of time for the maintenance when changing back-up rolls. <P>SOLUTION: The controller is provided with a pulse generator 8 attached to a motor M which acts on the shafts of upper and lower work rolls 3, 4 through gears, a controller part 12 to which rolling load detected with load cells 6 and the pulse detected with the pulse generator are inputted and processed as rolling load data corresponding to each of the upper and lower work rolls and each of the upper and lower back-up rolls 1, 2 and a roll eccentricity diagnosing device 13 by which variation by the roll eccentricity is detected by applying Fourier transformation to the data processed in the controller part 12, diagnosing that the roll eccentricity is generated on which roll and outputting it to the controller part. The controller part controls a screw-down device so as to perform compensation to a roll in which the roll eccentricity is generated on the basis of the diagnostic result. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roll eccentricity control device for a rolling mill in a rolling line.

  Due to the geometric eccentricity of several tens of microns between the center of the roll of the rolling mill backup roll (BUR) and the center of the roll body, periodic thickness variations occur in the material rolled by the rolling mill. As a device for preventing the phenomenon, there is a roll eccentricity control device.

  FIG. 8 is a block diagram showing a roll eccentricity control device of a conventional rolling mill. In the figure, an upper work roll 3 and a lower work roll 4 are supported by an upper backup roll 1 and a lower backup roll 2, and the material to be rolled 5 passes between these upper and lower work rolls 3, 4 in the direction of the arrow in the figure. Is rolled. A rolling mill constituted by upper and lower backup rolls 1 and 2 and upper and lower work rolls 3 and 4 is provided with a rolling load detector 6 for detecting a rolling load and a reduction device 7 for adjusting a gap between the upper and lower work rolls. Yes. A pulse generator 8 is attached to the upper and lower backup rolls 1 and 2. The output signals of the rolling load detector 6 are respectively input to an upper backup roll eccentricity detection device 21 that detects the roll eccentricity of the upper backup roll 1 and a lower backup roll eccentricity detection device 22 that detects the roll eccentricity of the lower backup roll 2. The output of the upper and lower backup roll pulse generator 8 is also input to the upper backup roll eccentricity detection device 21 and the lower backup roll eccentricity detection device 22. The phase adjusting device 23 plays a role of compensating the operation delay of the rolling-down device 7 by inputting the output results of the upper backup roll eccentricity detecting device 21 and the lower backup roll eccentricity detecting device 22. The reduction control device 24 inputs the result of the phase adjustment device 23 and controls the reduction device 7.

  Next, the operation of the roll eccentricity control device will be described. In FIG. 8, the rolling load detector 6 detects the rolling load for one rotation of the upper and lower backup rolls 1 and 2 in synchronization with the output pulse from the pulse generator 8 attached to the upper and lower backup rolls 1 and 2. Since the detected rolling load fluctuation includes fluctuations due to influences other than the roll eccentricity of the backup roll, in order to detect the rolling load fluctuation due to the roll eccentricity of the backup roll, the upper and lower backup roll eccentricity detection devices 21 and 22 are detected. The Fourier transform is performed by Based on the roll eccentricity data detected by the upper and lower backup roll eccentricity detection devices 21, 22, the phase adjusting device 23 calculates the phase and magnitude of the reduction position output so as to compensate for the roll eccentricity, and the reduction control device 24 reduces the reduction device. 7 is controlled.

  In addition to the above configuration, as a technique for improving the compensation accuracy of the roll eccentricity, for example, an actual measurement value or a calculated value of the thickness of the material to be rolled on the exit side of the rolling mill in which the roll eccentricity control device is installed The roll eccentricity control device of the rolling mill is known to more reliably prevent fluctuations in the sheet thickness due to roll eccentricity by performing compensation using the sensor, but it is attached to the upper and lower backup rolls to detect the rotation angle of the backup roll. A pulse generator is used (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-285717

As described above, in the roll eccentricity control apparatus in the conventional rolling mill, the pulse generator attached to the upper and lower backup rolls is used for detecting the rotation angle of the backup roll. Therefore, when replacing the backup roll, the pulse generator must also be removed, and there is a problem that maintenance work is simply required.
In addition, in order to aim at further control effects, not only the influence of eccentricity of the backup roll but also the influence of eccentricity of the work roll cannot be ignored, and more accurate considering the influence of both roll eccentricity. Roll eccentricity control is required.

  The present invention has been made to solve the above-described problem, and the backup is performed by the pulse generator attached to the motor that operates via the gear with respect to the work roll shaft without attaching the pulse generator to the upper and lower backup rolls. By detecting the effect of roll and work roll eccentricity, the roll eccentricity control device of the rolling mill can be controlled more accurately than before without the need for maintenance when replacing the backup roll. The purpose is to provide.

  The roll eccentricity control device of the rolling mill according to the present invention includes an upper and lower work roll for rolling the material to be rolled by passing the material to be rolled therebetween, and an upper and lower backup roll provided above and below the upper and lower work rolls, Detected by a rolling load detector that detects the rolling load, a reduction device that adjusts the gap between the upper and lower work rolls, a pulse generator attached to a motor that operates via a gear with respect to the axis of the upper and lower work rolls, and a load detector The controller unit that processes the rolling load and the output pulse detected by the pulse generator and processes the rolling load data as data corresponding to the upper and lower work rolls and the upper and lower backup rolls, and the rolling load data processed by the controller unit Is input, and Fourier transform is applied to it, and the fluctuation due to roll eccentricity among the rolling load fluctuations A roll eccentricity diagnosis device that detects and diagnoses which of the upper and lower work rolls and upper and lower backup rolls has roll eccentricity, and outputs to the controller unit. The controller unit is based on the diagnosis result of the roll eccentricity diagnostic device. Thus, the reduction device is controlled so as to compensate for the roll in which roll eccentricity has occurred.

  The controller unit also includes a data processing device, a phase adjustment device, and a reduction control device. The data processing device performs rolling based on the output pulse detected by the pulse generator and the diameter data of the upper and lower work rolls and the upper and lower backup rolls. The load data is processed as data corresponding to each of the upper and lower work rolls and the upper and lower backup rolls, and is output to the roll eccentricity diagnosis device. The phase adjustment device is based on the diagnosis result of the roll eccentricity diagnosis device, and receives the data from the data processing device. The phase of the reduction position output that compensates for roll eccentricity is calculated using the input data, and the reduction control device inputs the calculation result of the phase adjustment device and controls the reduction device.

  Further, the data processing device includes a rolling load calculation device, an angular position calculation device, and a data buffer device, and the rolling load calculation device uses an automatic plate thickness control device based on the rolling load detected by the rolling load detector. The net rolling load obtained by subtracting the output and the extra output of the roll eccentricity control itself is extracted, and the angular position calculator calculates the diameter data of the upper and lower work rolls and the upper and lower backup rolls from the output pulses detected by the pulse generator. Is used to calculate the angular positions of the upper and lower work rolls and the upper and lower backup rolls, and the data buffer device inputs the data calculated by the rolling load calculation device and the angular position calculation device, and the net rolling load data is input to the upper and lower work rolls. The data is buffered as a data set corresponding to the rotation operation of the roll and the upper and lower backup rolls.

  The data processing apparatus further includes a filter device, and the filter device performs a filtering process to remove rolling load data noise when the rolling load data buffered by the data buffer device is output to the phase adjusting device. Is to be applied.

  In addition, the data processing device further includes a phase lag compensation device, and the phase lag compensation device performs the reduction operation of the reduction device when outputting the angular position data buffered by the data buffer device to the phase adjustment device. In order to compensate for a time error from the control output timing caused by the delay of the output signal of the load detector, a phase delay process is performed.

  Furthermore, the roll eccentricity diagnosis unit performs Fourier transform on the input rolling load, calculates the spectral intensity (amplitude) of the frequency region corresponding to each roll, and is used for roll eccentricity diagnosis.

  As described above, according to the present invention, without using the pulse generator attached to the upper and lower backup rolls, the rolls are output using the output pulses from the pulse generator attached to the motor operating via the gear with respect to the work roll shaft. By detecting the angle position, maintenance work when replacing the backup roll can be saved. In addition, it is possible to perform roll eccentricity control with higher accuracy than before after diagnosing which roll is causing eccentricity.

Embodiment 1 FIG.
1 is a block diagram showing a roll eccentricity control device for a rolling mill according to Embodiment 1 of the present invention. In the figure, a pair of upper work rolls 3 and a lower work roll 4 are similarly supported by a pair of upper backup rolls 1 and lower backup rolls 2, and a rolling mill is constituted by these rolls. And it rolls by the to-be-rolled material 5 passing between the up-and-down work rolls 3 and 4 to the arrow direction in a figure. A rolling mill constituted by upper and lower backup rolls 1 and 2 and upper and lower work rolls 3 and 4 is provided with a rolling load detector 6 for detecting a rolling load and a reduction device 7 for adjusting a gap between the upper and lower work rolls. Yes. Further, a pulse generator 8 is attached to a motor M that operates via a gear with respect to the axes of the upper and lower work rolls 3 and 4. In general, as shown in FIG. 1, one motor M is attached to the upper and lower work rolls 3 and 4, but one motor is attached to each of the upper and lower work rolls 3 and 4. Of course, the present invention can be practiced.

  In the first embodiment, the roll eccentricity control includes a controller unit 12 and a computer unit 14. The controller unit 12 includes a data processing device 9, a phase adjustment device 10, and a reduction control device 11. The computer unit 14 includes a roll eccentricity diagnosis device 13.

  The rolling load detected by the rolling load detector 6 and the output pulse detected by the pulse generator 8 are input to the data processing device 9. The data processor 9 uses the output pulses detected by the pulse generator 8 and the diameter data of the upper and lower backup rolls 1 and 2 and the upper and lower work rolls 3 and 4 to transfer rolling load data to the upper and lower backup rolls 1 and 2 and the upper and lower work rolls 3, 4 is processed as data corresponding to each of 4 and output to the roll eccentricity diagnosis device 13 of the computer unit 14. The roll eccentricity diagnosis device 13 performs a Fourier transform on the rolling load data, detects a fluctuation due to the roll eccentricity from among the rolling load fluctuations, and obtains information on which of the four rolls has the roll eccentricity and the calculated amplitude. Output to the phase adjustment device 10. Based on the result of the roll eccentricity diagnosis device 13, the phase adjustment device 10 uses the input data from the data processing device 9 to calculate the phase of the reduction position output so as to compensate for the roll eccentricity to the maximum extent. The reduction control device 11 inputs the result of the phase adjustment device 10 and controls the reduction device 7.

  Next, operation | movement of the roll eccentricity control apparatus of the rolling mill of Embodiment 1 is demonstrated. In FIG. 1, the material to be rolled 5 is rolled by upper and lower work rolls 3 and 4. The rolling load applied to the rolling mill at this time is detected by the rolling load detector 6, and the rotational angle position of the motor M operating via the gears with respect to the axes of the upper and lower work rolls 3, 4 is detected by the pulse generator 8. Are output to the data processing device 9 as synchronized data.

  FIG. 2 is a configuration diagram of the data processing device 9, which includes a rolling load calculation device 15, an angular position calculation device 16, and a data buffer device 17. The rolling load calculation device 15 extracts net rolling load data obtained by subtracting the output of the automatic sheet thickness control device (AGC) and the output of the roll eccentricity control from the rolling load detected by the rolling load detector 6. The angular position calculation device 16 uses the diameter data of the upper and lower backup rolls 1, 2 and the upper and lower work rolls 3, 4 from the output pulse detected by the pulse generator 8 and uses the upper and lower backup rolls 1, 2 and the upper and lower work rolls 3. 4 angular positions are calculated. The data buffer device 17 receives the data calculated by the rolling load calculation device 15 and the angular position calculation device 16 and rotates the net rolling load data of the upper and lower backup rolls 1 and 2 and the upper and lower work rolls 3 and 4 respectively. Buffer as a data set corresponding to. As shown in FIG. 3, the buffered data groups (buffer 1 to buffer 4) are used for the phase calculation of the reduction position output in the phase adjustment device 10 and the eccentricity diagnosis of each roll in the roll eccentricity diagnosis device 13. . In roll eccentricity diagnosis, a sufficient number of data when rolling at a constant speed is required in order to calculate the spectral intensity (amplitude) of the frequency region corresponding to each roll by Fourier transform. Moreover, in Embodiment 1, the data used for roll eccentricity diagnosis are measurement data in the state without the board after roll replacement | exchange, as shown in FIG. The data measured without a plate is characterized by less noise and accurate diagnosis of roll eccentricity compared to data measured during rolling.

  The roll eccentricity diagnosis device 13 performs a Fourier transform on the input rolling load and calculates the spectral intensity for each frequency. An example of the graph is shown in FIG. This spectral intensity expresses on average the amplitude of roll eccentricity that appears in the rolling load. Using the result, there is a part where the spectral intensity is significantly higher than other frequency ranges, and it is determined whether the frequency is a frequency corresponding to each roll obtained from a constant speed in advance, and it corresponds to a certain roll If the frequency is the same frequency, the information indicating which roll it is and the spectrum intensity at that time, that is, the amplitude, is output to the phase adjustment device 10.

  The calculation result in the phase adjusting device 10 is output to a reduction control device 11 that controls the reduction device 7 to control the width of the gap between the upper and lower work rolls 3 and 4.

  As described above, according to the first embodiment, the output pulse from the pulse generator 8 attached to the motor operating via the gear with respect to the work roll shaft is used without using the pulse generator attached to the upper and lower backup rolls. Thus, by detecting the angular position of each roll, the maintenance work for replacing the backup roll can be saved. Further, the roll eccentricity diagnosis device 13 of the computer unit 14 makes use of the characteristics that can process a lot of data of the computer in a complicated manner, diagnoses which roll is causing the eccentricity, and the controller unit 12 receives the information. Because it is possible to perform accurate control by using, and because the load fluctuation at the previous rotation is used for calculation of the reduction position output at the next rotation, the integration of the tracking error of the angular position can be suppressed. In addition, roll eccentricity control with higher accuracy than before can be performed.

Embodiment 2. FIG.
5 is a block diagram showing a roll eccentricity control device for a rolling mill according to Embodiment 2 of the present invention. In the figure, the configuration of the roll eccentricity control device is the same as that of the first embodiment, and thus the description thereof is omitted. The difference from the first embodiment is the operation of the roll eccentricity diagnosis device 13 of the computer unit 14.

  In the second embodiment, data used in the roll eccentricity diagnosis device 13 is measurement data during rolling. The roll eccentricity diagnosis device 13 receives the data buffered by the data processing device 9 as an input, and at an arbitrary timing when a sufficient number of data is stored to perform the roll eccentricity diagnosis as shown in FIG. Perform roll eccentricity diagnosis. When the diagnosis is completed, the latest information is output to the phase adjustment device 10.

  As described above, according to the second embodiment, by using the data measured at the time of rolling without using the measurement data without the plate after the roll replacement, the measurement after the roll replacement is performed. Save time and use the data measured during rolling to diagnose at any timing, so that the latest information following the roll state change due to repeated rolling is reflected in the reduction position output calculation of the phase adjustment device 10 can do.

Embodiment 3 FIG.
6 is a block diagram showing a data processing device of a roll eccentricity control device for a rolling mill according to Embodiment 3 of the present invention, in which a filter device 18 is added to the configuration of Embodiment 1 (FIG. 2). . The configuration other than the data processing device 9 is the same as that of the second embodiment.

  As described above, according to the third embodiment, the filter function of the filter device 18 of the data processing device 9 can remove noise from the rolling load data used in the reduction position output calculation in the phase adjusting device 10, It is possible to remove fine errors included in the reduction position output and to perform more accurate control.

Embodiment 4 FIG.
FIG. 7 is a block diagram showing a data processing device of a roll eccentricity control device for a rolling mill according to Embodiment 4 of the present invention, in which a phase delay compensation device 19 is added to the configuration of Embodiment 3 (FIG. 6). It is. The configuration other than the phase lag compensation device 19 is the same as that of the third embodiment.

  As described above, according to the fourth embodiment, the phase lag compensation function of the phase lag compensation device 19 of the data processing device 9 compensates for the phase lag of the angular position data used in the reduction position output calculation in the phase adjustment device 10. It is possible to perform control with higher accuracy.

It is a block diagram which shows the roll eccentricity control apparatus of the rolling mill by Embodiment 1 of this invention. It is a block diagram which shows the data processor of the roll eccentricity control apparatus of the rolling mill by Embodiment 1 of this invention. It is a block diagram which shows the data buffering of the data processor of the roll eccentricity control apparatus by Embodiment 1 of this invention. It is a schematic diagram which shows the data analysis after the Fourier-transform of the roll eccentricity diagnostic apparatus of the roll eccentricity control apparatus by Embodiment 1 of this invention. It is a block diagram which shows the roll eccentricity control apparatus of the rolling mill by Embodiment 2 of this invention. It is a block diagram which shows the data processor of the roll eccentricity control apparatus of the rolling mill by Embodiment 3 of this invention. It is a block diagram which shows the data processor of the roll eccentricity control apparatus of the rolling mill by Embodiment 4 of this invention. It is a block diagram which shows the roll eccentricity control apparatus of the conventional rolling mill.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper backup roll 2 Lower backup roll 3 Upper work roll 4 Lower work roll 5 Rolled material 6 Rolling load detector 7 Reduction device 8 Pulse generator 9 Data processing device 10 Phase adjustment device 11 Reduction control device 12 Controller part 13 Roll eccentricity diagnosis Device 14 Computer section 15 Rolling load calculation device 16 Angular position calculation device 17 Data buffer device 18 Filter device 19 Phase lag compensation device M Motor

Claims (10)

Upper and lower work rolls for rolling the material to be rolled by passing the material to be rolled between,
Upper and lower backup rolls provided above and below the upper and lower work rolls;
A rolling load detector for detecting the rolling load;
A reduction device for adjusting the gap between the upper and lower work rolls;
A pulse generator attached to a motor that operates via a gear with respect to the axis of the upper and lower work rolls;
A controller unit that inputs a rolling load detected by the load detector and an output pulse detected by the pulse generator, and processes rolling load data as data corresponding to each of the upper and lower work rolls and the upper and lower backup rolls;
The rolling load data processed by the controller unit is input, and a Fourier transform is performed on the rolling load data to detect a change due to roll eccentricity from among the rolling load fluctuations, and roll eccentricity is detected in any of the upper and lower work rolls and the upper and lower backup rolls. A roll eccentricity diagnosis device that diagnoses whether or not it occurs and outputs to the controller unit;
The controller unit controls the rolling reduction device so as to compensate for a roll in which roll eccentricity occurs based on a diagnosis result of the roll eccentricity diagnostic device. Control device. The controller unit includes a data processing device, a phase adjustment device, and a reduction control device,
The data processing device processes rolling load data as data corresponding to each of the upper and lower work rolls and the upper and lower backup rolls based on the output pulse detected by the pulse generator and the diameter data of the upper and lower work rolls and the upper and lower backup rolls. Output to the eccentricity diagnostic device,
The phase adjustment device calculates the phase of the reduction position output so as to compensate for roll eccentricity using input data from the data processing device based on the diagnosis result of the roll eccentricity diagnostic device,
2. The roll eccentricity control device for a rolling mill according to claim 1, wherein the reduction control device controls the reduction device by inputting a calculation result of the phase adjusting device. The data processing device includes a rolling load calculation device, an angular position calculation device, and a data buffer device,
The rolling load calculation device extracts a net rolling load obtained by subtracting extra output such as the output of the automatic sheet thickness control device and the roll eccentricity control itself from the rolling load detected by the rolling load detector,
The angular position calculation device calculates the angular positions of the upper and lower work rolls and the upper and lower backup rolls from the output pulse detected by the pulse generator, using the diameter data of the upper and lower work rolls and the upper and lower backup rolls,
The data buffer device receives data calculated by the rolling load calculation device and the angular position calculation device, and sets the net rolling load data as a set of data corresponding to the rotational operations of the upper and lower work rolls and the upper and lower backup rolls. The roll eccentricity control device for a rolling mill according to claim 2, wherein the roll eccentricity is controlled as follows. The data processing device further includes a filter device,
4. The filter device according to claim 3, wherein when the rolling load data buffered by the data buffer device is output to the phase adjusting device, the filtering device performs a filtering process to remove noise of the rolling load data. Roll eccentricity control device for rolling mill. The data processing device further includes a phase lag compensation device,
The phase lag compensator is configured to output the angular position data buffered by the data buffer device to the phase adjustment device, and a time with a control output timing generated due to a reduction operation of the reduction device and a delay of the output signal of the load detector. 5. A roll eccentricity control apparatus for a rolling mill according to claim 4, wherein a phase delay process is performed to compensate for the error.   The roll eccentricity diagnosis device unit performs Fourier transform on the input rolling load, calculates a spectral intensity (amplitude) of a frequency region corresponding to each roll, and is used for roll eccentricity diagnosis. The roll eccentricity control apparatus of the rolling mill in any one of claim | item 5. Backup is performed by detecting the angular position of the roll using the output pulse from the pulse generator attached to the motor that operates via the gear with respect to the work roll axis, without using the pulse generator attached to the upper and lower backup rolls. It is a roll eccentricity control device for a rolling mill that can easily perform maintenance at the time of roll exchange,
The computer section makes use of the characteristics of a computer that can process a large number of data in a complicated manner, and diagnoses which roll is decentered using data measured without a plate after roll replacement. ,
The controller uses that information and performs roll eccentricity control by using the load fluctuation at the previous rotation to calculate the reduction position output at the next rotation, thereby suppressing the integration of the tracking error of the angular position. A roll eccentricity control device for a rolling mill. Backup is performed by detecting the angular position of the roll using the output pulse from the pulse generator attached to the motor that operates via the gear with respect to the work roll axis, without using the pulse generator attached to the upper and lower backup rolls. It is a roll eccentricity control device for a rolling mill that can easily perform maintenance at the time of roll exchange,
In the computer part, taking advantage of the characteristics of a computer that can process a large number of data in a complex manner, it is possible to repeat the rolling by diagnosing which roll is decentered at any timing using the data measured during rolling. Follow the roll state change due to,
The controller uses the latest information and uses the load fluctuation during the previous rotation to calculate the reduction position output during the next rotation, thereby suppressing the roll position eccentricity control, thereby suppressing roll eccentricity control. A roll eccentricity control device for a rolling mill, characterized in that: Backup is performed by detecting the angular position of the roll using the output pulse from the pulse generator attached to the motor that operates via the gear with respect to the work roll axis, without using the pulse generator attached to the upper and lower backup rolls. It is a roll eccentricity control device for a rolling mill that can easily perform maintenance at the time of roll exchange,
In the computer part, taking advantage of the characteristics of a computer that can process a large number of data in a complex manner, it is possible to repeat the rolling by diagnosing which roll is decentered at any timing using the data measured during rolling. Follow the roll state change due to,
The controller uses the latest information, removes noise from the load fluctuation during the previous rotation using the filter function, and then uses it to calculate the rolling position output during the next rotation, thereby integrating the angular position tracking error. A roll eccentricity control apparatus for a rolling mill, characterized by performing roll eccentricity control by suppressing the roll. Backup is performed by detecting the angular position of the roll using the output pulse from the pulse generator attached to the motor that operates via the gear with respect to the work roll axis, without using the pulse generator attached to the upper and lower backup rolls. It is a roll eccentricity control device for a rolling mill that can easily perform maintenance at the time of roll exchange,
In the computer part, taking advantage of the characteristics of a computer that can process a large number of data in a complex manner, it is possible to repeat the rolling by diagnosing which roll is decentered at any timing using the data measured during rolling. Follow the roll state change due to,
The controller uses the latest information, processes the angular position data of each roll using the phase lag compensation function, removes noise from the load fluctuation during the previous rotation using the filter function, and then reduces the rolling position during the next rotation. A roll eccentricity control apparatus for a rolling mill, characterized in that roll eccentricity control is performed by suppressing the integration of angular position tracking errors by being used for output calculation.

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