JP2604528B2 - Setting method for rolling reduction of sheet rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling operation using a plate rolling mill having a rolling load measuring device, and in setting a rolling reduction before rolling, a difference between a working side setting value and a driving side setting value is optimized. About the method.

[0002]

2. Description of the Related Art At present, the rolling reduction of a sheet rolling mill is basically basically set by a computer in accordance with an algorithm as shown in FIG. 12, and the rolling reduction values on the working side and the driving side are set at this time. The left and right values are basically the same. In the following description, the expression “left and right” is often used, but unless otherwise specified, this means the driving side and the working side of the rolling mill. The operation mode at this time is that the operator has changed this so that a stable threading state can be realized while observing the threading state of the rolled material. In fact, it is completely up to the operator in terms of leveling. Such an operation by an operator requires a high degree of skill,
Since it is not based on quantitative data, there is an individual difference, and since it is post-processing, it is impossible to completely prevent the occurrence of a threading accident or a wedge camber of rolled material.

[0003] The following two types of methods are usually used to adjust the zero point of the screw-down device after the roll is replaced, which is important in terms of the standard of the left-right difference in the set value. Tightening is performed so that the output of the rolling load measuring device is the same on the left and right, and the reduction setting state at that time is defined as a zero point. A copper rod or aluminum plate is tightened between upper and lower work rolls, and the zero point of the reduction setting is corrected from the difference in thickness between the left and right sides.

[0004] Of the above two methods, the method is very simple and clear and can be easily automated by a computer. However, since the absolute value of the output of the rolling load measuring device is used, the zero point of the rolling load measuring device is used. Optimal zero adjustment is not possible unless the calibration of the sensitivity and sensitivity has been completed. This method is performed to correct this, but this method requires time by hand, and even if the roll opening degree near the zero-point adjustment load is optimized, one by one rolling It is almost impossible to optimize the leveling for all rolling loads that take various values for each material.

[0005]

Conventionally, as described above, the leveling setting method basically relies entirely on the operator, and a scientific setting method based on quantitative data is not used. Not established. Originally, rolling mills were manufactured completely symmetrically, including the elastic contact surfaces of each part, and the characteristics of the rolling load measuring device were also completely symmetrical. If the deformation resistance and the like are also completely symmetrical, there is no need to make a left-right difference between the rolling reduction values, and it is only necessary to always perform the rolling reduction symmetrically. However, in practice, although rolling mills are basically made symmetrically, there is usually a slight difference in the shape of the elastic contact surface such as the contact surface between the reinforcing roll and the screw or liner. Therefore, the deformation characteristics of the rolling mill are also essentially left-right asymmetric,
Also, the characteristics of the rolling load measuring device do not always completely match the working side and the driving side. Further, the dimensions, temperature distribution, deformation resistance, and the like of the rolled material generally have a left-right difference, and it is necessary to ensure good dimensional accuracy of the rolled material after rolling while securing good sheet passing property. Must set the leveling taking into account all these factors.

In order to solve the above problems, the present invention detects the difference between the right and left of the characteristics of a rolling mill and a rolling load measuring device, and furthermore, the optimum difference between the right and left of a rolling reduction value in consideration of the asymmetry of a rolled material. A method for calculating and setting is disclosed.

[0007]

Means for Solving the Problems The first gist of the present invention to solve the above problems is to provide a method for setting a rolling reduction of a plate rolling mill having a rolling load measuring device.
In the non-rolling state, operate the rolling device to bring the upper and lower work rolls into contact with each other, further tighten the rolling device, and at a plurality of points in the course of the process, the working set and driving side rolling set positions and the rolling load measuring device The output is sampled at the same time, the deformation of the roll system corresponding to the conditions at each time point is calculated and separated,
The difference between the working-side and drive-side rolling reduction values is calculated using the working-side and drive-side asymmetry data of the resulting deformation characteristics of the housing and the rolling-down system. The second aspect of the present invention is a method for setting a rolling reduction in a sheet rolling mill having a hydraulic work roll bending device and a rolling load measuring device for measuring a load of the reducing device. When the roll gap is opened, the work roll bending device applies a load in the direction of opening the upper and lower work roll gaps by two or more levels, and is detected by a pressure measuring device of the supply oil to the working cylinder of the work roll bending device. The roll bending force calculated from the hydraulic pressure, the effective sectional area of the working cylinder and the number of working cylinders, and the supporting load of the reinforcing roll Analyze the corresponding relationship with the output of the rolling load measuring device to be determined, analyze the correlation between the working side and the driving side separately, and calibrate the zero point or both the zero point and the sensitivity of the rolling load measuring device. After that, operating the drafting device in the non-rolled state to contact the upper and lower work rolls,
Furthermore, the screw-down device is further tightened, and at several points in the course of the process, the working-side and drive-side screw-down set positions and the output of the rolling load measuring device are simultaneously sampled, and the deformation of the roll system corresponding to the conditions at each time point is obtained. Calculation and separation, and calculating the difference between the working-side and drive-side screw-down set values using the working-side and drive-side asymmetry data of the resulting deformation characteristics of the housing and the screw-down system. The present invention lies in a method for setting a rolling reduction of a plate rolling mill characterized by the point that the gist of the third invention is that of a sheet rolling mill having a hydraulic work roll bending device and a rolling load measuring device for measuring the load of the rolling device. In the reduction setting method, when the roll gap is open at the time of non-rolling, the work roll bending device applies two or more levels of load in the direction in which the upper and lower work roll gaps are opened. Measure the oil pressure detected by the pressure measuring device of the supply oil to the working cylinder of the roll bending device, the roll bending force calculated from the effective sectional area of the working cylinder and the number of working cylinders, and the supporting load of the reinforcing roll. Analyze the correspondence between the output of the rolling load measuring device, analyze the correlation between the working side and the driving side separately, and calibrate the zero point or both the zero point and the sensitivity of the rolling load measuring device. And after the roll change,
After adjusting the zero point of the reduction device so that the corrected load, that is, the load acting between the upper and lower work rolls is evenly distributed to the work side and the drive side, the reduction of the work side and the drive side of each rolled material is performed. A fourth aspect of the present invention resides in a method for setting a rolling reduction of a plate rolling mill, which calculates a difference between set values. In a method for setting a rolling reduction of a sheet rolling mill having a load measuring device, in a state where a roll gap is open during non-rolling, two or more levels of loads in a direction of opening a vertical work roll gap are applied by the work roll bending device, and the work roll bending is performed. Roll pressure calculated from the oil pressure detected by the pressure measuring device of the supply oil to the working cylinder of the device, the effective sectional area of the working cylinder, and the number of working cylinders The analysis of the correspondence between the rolling force and the output of the rolling load measuring device for measuring the supporting load of the reinforcing roll, and analyzing the correlation between the working side and the driving side separately from each other. After calibrating the zero point or both the zero point and the sensitivity, operate the drafting device in the non-rolled state to bring the upper and lower work rolls into contact, further tighten the drafting device, and at several points in the course of the work, The output of the rolling load measuring device and the set position of the rolling side and the driving side are simultaneously sampled, the deformation of the roll system corresponding to the conditions at each time point is calculated and separated, and the resulting deformation characteristics of the housing and the rolling system are obtained. Using the data of the asymmetry of the working side and the drive side, and based on the data of the left and right difference of the dimensions and deformation characteristics of the rolled material before rolling,
Calculates the target value of the thickness distribution in the width direction after rolling and the predicted value of the rolling load distribution in the width direction, and calculates the difference between the reduction values of the working side and the drive side based on all the above data. In the rolling reduction method of a sheet rolling mill.

FIG. 1 shows an algorithm of a rolling reduction method according to the first invention. The rolling reduction method of the present invention presupposes a plate rolling mill having a rolling load measuring device on each of the working side and the driving side. A so-called kiss roll tightening test is performed in which the upper and lower work rolls are brought into contact with each other by operating the pressing device in a non-rolled state such as a cut idle time, and the pressing device is further tightened. Then, at a plurality of points in the course of the process, the reduction setting positions on the working side and the driving side and the output of the rolling load measuring device are simultaneously sampled. The resulting data are working side, respectively g _W the rolling setting value of the driving side, g _D, working side the output of the rolling load measuring device, the drive side respectively P _W, P _D
Then, it can be interpreted as a discrete expression of a functional relationship such as the following equation. g _W = g _W (P _W , P _D ) (1) g _D = g _D (P _W , P _D ) (2)

Since the roll gap between the upper and lower work rolls remains zero during this time, the deformation of the roll / roll-down system and the housing, that is, the deformation of the entire rolling mill, is determined by the change in the set value after the upper and lower rolls come into contact with each other. That is, This amount of deformation is calculated, excluding the amount of deformation of the roll system, the amount of deformation delta _O ^W of the housing and pressure system of the work side and drive side, delta _O ^D is the work side and drive side respectively applied load P _W, It would be represented by the following equation as a discrete relationship P _D. Δ _O ^W = Δ _O ^W (P _W ) (3) Δ _O ^D = Δ _O ^D (P _D ) (4)

If the deformation characteristics of the working side and the drive side can be obtained independently as in the equations (3) and (4), the asymmetry of the rolling mill mainly including the asymmetry of the shape of the elastic contact surface is included. As a result, the deformation characteristics of the housing and the rolling system were estimated based on the actual measurement data. Based on the deformation characteristics of the housing and the rolling system in Equations (3) and (4), the upper and lower work rolls were rolled by the rolling load during rolling. The amount of change in the inter-roll gap, that is, the mill stretch, may be calculated, and the reduction values on the working side and the drive side may be determined so as to obtain a predetermined thickness distribution.

When extracting the deformation characteristics on the working side and the drive side of the rolling mill by the above method, the accuracy of the rolling load measuring device becomes very important. Therefore, in the second invention of the present application,
After the calibration of the rolling load measuring device using the roll bending device as shown in FIG. 2 and the accuracy compensation thereof, the deformation characteristics of the housing of the rolling mill and the rolling system are determined according to the procedure of the first invention of the present application. It discloses a method of extracting and determining leveling by mill stretch calculation using this.

FIG. 5 shows an example of a side view of a typical plate rolling mill. The rolling mill shown in FIG.
-1, 8-2 are supported by reinforcing rolls 9-1, 9-2, and the upper reinforcing roll 9-1 is a reinforcing roll balance device 6--6.
1, 6-2 presses against the rolling load measuring device 1 and the rolling device 12, and is configured to follow the movement of the rolling device. Also, the increment work roll bending devices 2-1 and 2-2 and 3-1 and 3-2 also have a role of a roll balance, and work rolls 8-1 through work roll chock 10-1 and 10-2. And 8-2 are pressed against the reinforcing rolls 9-1 and 9-2. FIG. 5 also shows a roll-bending device 4-1 and 4-2 and 5-1 and 5-2 for applying a force in a direction opposite to the roll balance for reference. The calibration method of the measuring device is based on the premise that a roll bending force in the direction of opening the upper and lower work roll gaps is applied as a resultant force, and the decrease work roll bending device is not an essential requirement. The work roll bending device shown in FIG. 5 is of a hydraulic type, and at least the work roll bending devices 2-1 and 2-2 on the rolling load measuring device 1 side are provided with a pressure measuring device 14 for the working oil supplied to the working cylinder. It is assumed that is equipped.

FIG. 5 shows a non-rolling state in such a rolling mill.
With the upper and lower work roll gaps open as described above, a load of two or more levels is applied by the roll bending devices 2-1 and 2-2, the actual value of the oil pressure by the pressure measurement device 14, the effective sectional area of the working cylinder, and the The work roll bending force is calculated from the number, and the correspondence between the work roll bending force and the load measured by the rolling load measuring device 1 is obtained as data. When the roll gap is open, the work roll body is unloaded, and the load applied by the work roll bending device is directly transmitted to the rolling load measuring device 1 except for the weight of the roll and the spindle. become. Therefore, the applied roll bending force and the value measured by the rolling load measuring device 1 should ideally coincide with each other except for the bias due to the weight of the roll, the spindle, and the like. Calibrating the zero point or both the zero point and the sensitivity is the basic concept of the method of calibrating the rolling load measuring device which is a constituent feature of the second invention of the present application.

FIG. 6 shows the actual hot strip mill finish rolling mill No. An example of data obtained by the above method using six stands is shown. In FIG. 6, the data of the load and the unloading are all plotted with five levels of the roll bending force load. In the figure, there is data with a significant difference in the output of the rolling load measuring device for almost the same value of the roll bending force, but this is the difference between when the load is applied and when the load is unloaded. It is considered that the hysteresis caused by the phenomenon became apparent. As one of the prior arts, there is a method of adjusting a zero point of a rolling load measuring device by applying a constant roll balance force. When checking a zero point of the rolling load measuring device by this, as shown in FIG. There is a risk that the maximum value of the hysteresis becomes an error of the zero point as it is. On the other hand, data for a plurality of load levels are collected as shown in FIG.
For example, by performing a data process of approximating this by a straight line using the least square method, it is possible to minimize the influence of such hysteresis.

In general, the pressure sensor of the hydraulic circuit used in the pressure measuring device 14 is much smaller and less expensive than the rolling load measuring device 1, and a pressure sensor that has been sufficiently checked for accuracy is periodically used. It is also easy to replace each other, or to introduce a plurality of sensors into the same hydraulic circuit, and to perform an accuracy check on each other, which makes it very easy to manage the accuracy. Therefore, there is a great advantage that it is possible to control the accuracy of a rolling load measuring device which is very expensive and cannot be easily replaced by using this.

In FIG. 6, the least squares approximation of the data including the gradient of the straight line is performed for the purpose of calibrating both the zero point and the sensitivity of the rolling load measuring device. However, the purpose is to calibrate only the zero point. If so, a linear approximation with a fixed gradient of 1 may be performed as shown in FIG. For example, when both the zero point and the sensitivity are calibrated, the following equation is obtained by linear approximation of the data in FIG. P _W = 1.039F-59.6 (5) P _D = 1.022F-82.9 (6)

Here, P _W and P _D are output values of the rolling load measuring devices on the working side and the driving side, respectively, F is the roll bending force, and the unit is both tonf. In the present invention, since the value of F is considered to be a sufficiently calibrated and accurate value, values obtained by evaluating the true load applied between the upper and lower work rolls on the working side and the driving side are Q _W and Q _D. In this case, Q _W and Q _D are obtained from the measured values P _W and P _{D according} to the following equations from the equations (5) and (6). Q _W = (P _W +59.6) /1.039 (7) Q _D = (P _D +82.9) /1.022 (8)

Since the values of Q _W and Q _D during the rolling measured and calculated in this way include the roll bending force F, the true force acting between the rolled material and the work roll is obtained. If it is desired to estimate the load, the measured value of the roll bending force F at that time may be subtracted from the values of Q _W and Q _D. Further, instead of performing the calculations as in the equations (7) and (8), substantially the same sensitivity and bias adjustment may be electrically performed.

When only the calibration of the zero point is intended, FIG.
The following relationship is obtained from the linear approximation in which the gradient is fixed to 1. P _W = F−55.1 (9) P _D = F−80.4 (10) Therefore, the true loads Q _W and Q _D including the roll bending force are calculated from the measured loads P _W and P _{D according} to the following equations. Desired. Q _W = P _W +55.1 (11) Q _D = P _D +80.4 (12)

In the above procedure, the weight of the roll and the spindle is not mentioned at all, but physically, between the roll bending force F and the value detected by the rolling load measuring device 1, the weight of the roll and the spindle is not described. There should be a weight bias. However, since this value is constant unless the rolls are exchanged, the bias component is the bias component of the rolling load detection device itself in accordance with the original purpose of detecting the rolling load, which is to detect the load acting between the upper and lower work rolls. The idea is to absorb in the. Of course, the roll bending force F and the true load Q are accurately taken into account by the weight of the roll and the spindle.
_W, but it is also possible to describe the relationship of Q _D, even in this case, the basics of the procedure is the same.

By the way, when the roll exchange is performed after the calibration of the rolling load measuring device by the above method,
Since the weights of the rolls are different, the zero point of the rolling load changes theoretically by the weight difference of the rolls. In order to cope with this, the rolling load measuring device should be calibrated by the above-described method again immediately after the roll change. This makes it possible to maintain the same accuracy of the rolling load measuring device as before the roll change. After calibrating the rolling load measuring device according to the above procedure, a kiss roll tightening test is performed, and the deformation characteristics of the housing and the pressing system are analyzed. By setting the rolling reduction in consideration of the above, it is possible to significantly improve the threadability of the rolled sheet.

When the rolling reduction is set by separately analyzing the left and right deformation characteristics of the rolling mill as described above, the zero point adjustment of the rolling reduction value is particularly important. Conventional methods for adjusting the zero point of the rolling device include a method based on the above-described rolling load measuring device and a method in which a copper bar or aluminum plate is tightened, but it is already described that each has a problem. Was. Therefore, in the third invention of the present application, as shown in FIG.
Discloses a method of calibrating a rolling load measuring device, which is a problem of the zero point adjustment method, by the method of the second invention of the present application. That is, this method is a method in which a hydraulic work roll bending device is loaded with the upper and lower work roll gaps open during non-rolling, and the rolling load measuring device is calibrated based on the measured value of the roll bending force. According to this method, the load acting between the upper and lower work rolls can be accurately detected by the rolling load measuring device. It is possible to carry out the zero point adjustment of the screw-down device so that the load acting on the work side is evenly distributed to the working side and the drive side. If such zero point adjustment is performed, ideal rolling with zero leveling load and zero wedge of the rolled material is realized during ideal rolling in which the zero point adjustment load acts symmetrically.

In the actual rolling operation, not only the ideal rolling as described above, but also the dimensions or deformation characteristics of the rolled material before rolling usually have left-right asymmetry. In order to realize a proper passing state, the above-mentioned asymmetry of the rolled material before rolling must be measured in advance, and an optimum leveling setting must be performed in consideration of the asymmetry. Therefore, in the fourth invention of the present application, as shown in FIG. 4, in addition to the second invention of the present application, the right and left differences in the dimensions and deformation characteristics of the rolled material before rolling are measured or estimated, and based on this, Determine the target value of the sheet thickness distribution, further estimate the material off-center amount, calculate the rolling load and the distribution of the rolling load in the sheet width direction when this is realized, and based on this, the deformation characteristics of the housing and the rolling system and A method is disclosed in which a mill stretch calculation including an asymmetric deformation of a roll system is performed to calculate a rolling reduction value including a leveling. Here, the difference between the left and right dimensions of the rolled material includes a sheet camber in addition to the left and right difference in sheet thickness, and the left and right difference in the deformation characteristics includes the left and right difference in the deformation characteristics due to the temperature difference in hot rolling. . After measuring or estimating these left-right differences, the target value of the thickness distribution after rolling and the material off-center amount are calculated. Note that the material off-center amount referred to here is the distance between the center of the sheet width of the rolled material and the mill center, and a zero material off-center amount is ideal for the rolling operation, but when the sheet camber of the incoming material is large. In some cases, the material off-center amount may not become zero from the time of material biting. Also, the target value of the sheet thickness distribution after rolling, if only a sheet wedge is present, in order to give the highest priority to sheetability, rolling with a uniform rolling reduction is the target,
When considering improvement of a sheet wedge or a sheet camber, rolling with a reduction ratio distribution may be performed.

[0024]

EXAMPLE Using a four-high rolling mill as shown in FIG. 5, calibration of a rolling load measuring device using a work roll bending device was carried out every time a work roll was replaced. After calibrating the measuring device, a kiss roll tightening test is performed, and the roll deformation is separated from the data on the relationship between the rolling reduction value and the rolling load measurement device, and the deformation characteristics of the housing / rolling system are checked on the working side.
Data is separately extracted on the drive side and stored in the computer for setting calculation. By calibrating the rolling load measuring device every time the work rolls are changed, it is possible to accurately detect the load acting between the upper and lower working rolls with the rolling load measuring device regardless of the change in weight of the working rolls etc. Become.
In addition, by performing a kiss roll tightening test every time the reinforcing roll is replaced, and extracting the deformation characteristics of the housing and the reduction system, the change in the deformation characteristics of the elastic contact surface between the reinforcement roll chock and the reduction screw or liner can be immediately detected. It is possible to compensate.

FIG. 8 shows the actual hot strip mill finish rolling mill No. In this figure, data on the correspondence between the roll bending force and the rolling load measuring device was collected at a seven stand (four-high rolling mill) in accordance with the method for calibrating the rolling load measuring device of the present invention. In FIG. 8, linear approximation is performed with the gradient fixed at 1 only for the purpose of zero point adjustment of the rolling load measuring device. From these approximated straight lines, the true loads Q _W and Q _{D are obtained.}
Is calculated by the following equation. Q _W = P _W +90.5 (13) Q _D = P _D +59.7 (14)

On the other hand, FIG. 9 shows data obtained after six months from the same rolling mill, from which the following correction formula is obtained. Q _W = P _W +59.6 (15) Q _D = P _D +131.1 (16)

Therefore, when the corrections of the equations (13) to (16) are not performed, the difference between the rolling load on the working side and the rolling load on the working side is (90.5-59.7)-(59.6) within half a year. −
131.1) = 102.3 tonf. If the leveling setting is performed while keeping such a change, it will have a serious adverse effect on the threading operation, and it can be seen that accurate zero adjustment of the rolling load is very important.

FIG. 10 shows an example of the relationship between the set value and the measured load obtained by the kiss roll tightening test. FIG. 11 separates the deformation of the roll system from the data of FIG. This is an extraction of the deformation characteristics. In FIG. 11, the vertical axis represents the measured load in order to associate the deformation characteristics of the housing and the rolling system on the working side and the drive side with the rolling load defined as the sum of the outputs of the left and right rolling load measuring devices. Is expressed as a rolling load. According to the data in FIG.
When the rolling load changes by 1000 ton, the difference between the left and right sides of the deformation of the housing / press-down system (work side-drive side) is -58 μm
It can be seen that there is a non-negligible left-right difference in the deformation characteristics of the housing / press-down system, and it is important to correct this based on the data in FIG.

[0029]

By using the method for setting the rolling reduction of a sheet rolling mill according to the present invention, the optimum leveling setting can always be realized.
As a result, there is almost no accident at the time of passing the board,
The working rate and yield can be greatly improved, and defects in dimensional accuracy, such as a thickness wedge of a rolled material and a camber, can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an algorithm of a rolling reduction method for a sheet rolling mill according to the first invention of the present application.

FIG. 2 is a diagram showing an algorithm of a rolling reduction method of a sheet rolling mill according to a second invention of the present application.

FIG. 3 is a diagram showing an algorithm of a rolling reduction method of a sheet rolling mill according to a third invention of the present application.

FIG. 4 is a diagram showing an algorithm of a rolling reduction method for a sheet rolling mill according to a fourth invention of the present application.

FIG. 5 is a schematic view showing a side surface of a four-high rolling mill, which is a typical plate rolling mill.

FIG. 6: Actual hot strip mill finishing mill No. The figure which applied the roll bending force at the time of no load in 6 stands, plotted the correspondence with the output of the rolling load measuring device, and approximated the data linearly by the least square method.

FIG. 7 is a diagram in which data is approximated by a straight line having a slope of 1 with respect to the same data as in FIG. 6;

FIG. 8 shows an actual hot strip mill finishing mill No. The figure which applied the roll bending force at the time of no load in 7 stands, plotted the corresponding relationship with the output of the rolling load measuring device, and approximated the data with the straight line of the gradient 1.

FIG. 9 is a diagram in which similar data is collected by the same rolling mill as in FIG. 8 half a year after the data is collected in FIG. 8, and the data is approximated by a straight line having a gradient 1;

FIG. 10 is a diagram showing the relationship between the set value obtained by the kiss roll tightening test and the load measured by the rolling load measuring device separately for the working side (WS) and the driving side (DS).

FIG. 11 calculates the deformation of the roll system from the data of FIG.
FIG. 11 is a diagram showing the deformation characteristics of the housing / rolling system obtained by separating the WS / DS separately in relation to the amount of deformation of the housing / rolling system and the rolling load.

FIG. 12 is a diagram showing an algorithm for setting a rolling reduction of a conventional plate rolling mill.

[Explanation of symbols]

1 Rolling load measuring device 2-1 and 2-2 Increase work roll bending device 3-1 and 3-2 Increase work roll bending device 4-1 and 4-2 Decrease work roll bending device 5-1 and 5- 2 Decrease work roll bending device 6-1 and 6-2 Reinforcement roll balance device 7-1, 7-2 Reinforcement roll balance device 8-1, 8-2 Work roll 9-1, 9-2 Reinforcement roll 10-1 , 10-2 Work roll chock 11-1, 11-2 Reinforcement roll chock 12 Roll-down device 13 Housing 14 Work roll bending device Working oil pressure measurement device

Claims (4)

(57) [Claims] In a method for setting a rolling reduction of a sheet rolling mill having a rolling load measuring device, a rolling device is operated in a non-rolled state so that upper and lower work rolls are brought into contact with each other, and the rolling device is further tightened. At a plurality of points in time, the working-side and drive-side reduction set positions and the output of the rolling load measuring device are simultaneously sampled, the deformation of the roll system corresponding to the conditions at each point in time is calculated and separated, and the housing obtained as a result is obtained. And a method of calculating the difference between the set values of the working side and the drive side by using the asymmetry data of the working side and the drive side of the deformation characteristics of the rolling system. 2. A method for setting a rolling reduction of a sheet rolling mill having a hydraulic work roll bending device and a rolling load measuring device for measuring a load of a reduction device, wherein the work roll is not rolled and a roll gap is open. The bending device applies two or more levels of load in the direction in which the upper and lower work roll gaps are opened, and the hydraulic pressure detected by the pressure measurement device for the supply oil to the working cylinder of the work roll bending device, the effective sectional area of the working cylinder, and the operation Analyze the correspondence between the roll bending force calculated from the number of cylinders and the output of the rolling load measuring device that measures the supporting load of the reinforcing roll, and separate the working side and the driving side from the correlation between the two. After analyzing and calibrating the zero point or both the zero point and the sensitivity of the rolling load measuring device, operating the rolling down device in the non-rolled state, The work rolls were brought into contact with each other, and the drafting device was further tightened.At several points in the course of the process, the working-side and driving-side draft setting positions and the output of the rolling load measuring device were simultaneously sampled, and the conditions at each time point were measured. The deformation of the corresponding roll system is calculated and separated.
A rolling reduction method for a plate rolling mill, wherein a difference between a rolling reduction value on the working side and a reduction value on the driving side is calculated using data on asymmetry on the driving side. 3. A method of setting a rolling reduction of a sheet rolling mill having a hydraulic work roll bending device and a rolling load measuring device for measuring a load of a reduction device, wherein the work roll is not rolled and a roll gap is open. The bending device applies two or more levels of load in the direction in which the upper and lower work roll gaps are opened, and the hydraulic pressure detected by the pressure measurement device for the supply oil to the working cylinder of the work roll bending device, the effective sectional area of the working cylinder, and the operation Analyze the correspondence between the roll bending force calculated from the number of cylinders and the output of the rolling load measuring device that measures the supporting load of the reinforcing roll, and separate the working side and the driving side from the correlation between the two. After analyzing and calibrating the zero point or both the zero point and the sensitivity of the rolling load measuring device, after replacing the roll,
After adjusting the zero point of the reduction device so that the corrected load, that is, the load acting between the upper and lower work rolls is evenly distributed to the work side and the drive side, the reduction of the work side and the drive side of each rolled material is performed. A method for setting a rolling reduction of a sheet rolling mill, wherein a difference between set values is calculated. 4. A method for setting a rolling reduction of a sheet rolling mill having a hydraulic work roll bending device and a rolling load measuring device for measuring a load of a reduction device, wherein the work roll is not rolled and a roll gap is open. The bending device applies two or more levels of load in the direction in which the upper and lower work roll gaps are opened, and the hydraulic pressure detected by the pressure measurement device for the supply oil to the working cylinder of the work roll bending device, the effective sectional area of the working cylinder, and the operation Analyze the correspondence between the roll bending force calculated from the number of cylinders and the output of the rolling load measuring device that measures the supporting load of the reinforcing roll, and separate the working side and the driving side from the correlation between the two. After analyzing and calibrating the zero point or both the zero point and the sensitivity of the rolling load measuring device, operating the rolling down device in the non-rolled state, The work rolls were brought into contact with each other, and the drafting device was further tightened.At several points in the course of the process, the working-side and driving-side draft setting positions and the output of the rolling load measuring device were simultaneously sampled, and the conditions at each time point were measured. The deformation of the corresponding roll system is calculated and separated.
Using the asymmetry data on the drive side, and based on the data of the left and right differences in the dimensions and deformation characteristics of the rolled material before rolling, the target value of the thickness distribution in the width direction after rolling and the rolling in the width direction A rolling reduction method for a plate rolling mill, wherein a predicted value of a load distribution is obtained, and a difference between a rolling reduction value on a working side and a reduction value on a driving side is calculated based on the above data.