JP2002292416A - Control method for meandering in tail end of threading material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for controlling the meandering in the tail end of a threading material capable of carrying out exactly the controlling of the meandering from a differential load applied to the threading material even if an indeterminate meandering factor of the threading material exists. SOLUTION: In the control method for controlling the meandering in the tail end of the threading material for detecting a rolling load, obtaining a differential load as an input value, and outputting a leveling quantity as an output value to conduct controlling, at least a first calculation paragraph for calculating a difference calculation value from a differential signal of the input value inputted, a second calculation paragraph for calculating the sum of the variation quantity in the present roll gap variated from the roll gap at the reference time and the leveling quantity operated by the last time output value as the detected calculation value intended to make a roll gap state in the reference time from the input value inputted, the differential calculation value by the first calculation, paragraph, and the detected calculation value by the second calculation paragraph are used to constitute the meandering control method for outputting the output value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meandering control at the tail end of a rolled and passed strip material, and more particularly to a control of a strip material which can appropriately control the tail end of the strip material by a differential load. It relates to meandering control at the tail end.

[0002]

2. Description of the Related Art Generally, when meandering occurs during rolling of a passing material such as a steel plate, a copper plate or an aluminum plate, the tail end of the passing material comes into contact with somewhere in the apparatus, causing breakage or narrowing. In particular, meandering control at the position of the tail end is required.

Conventionally, meandering control of a passing material has been disclosed in JP-A-6-2
69825, JP-A-61-144208,
JP-A-7-178434 or JP-A-7-24
No. 6412 is known.

For example, in Japanese Patent Application Laid-Open No. Hei 6-269825, a vendor differential pressure operation amount for a vendor on the operation side and a drive side and a difference load change amount between rolling loads on the operation side and the drive side are used. From the amount of change in differential load and the amount of meandering of the rolled sheet material and its differential amount and the amount of change in bender differential pressure, the obtained meandering amount estimated value,
The operation amount of the bender differential pressure is adjusted in accordance with the estimated value of the meandering differential amount and the estimated value of the change amount of the vendor differential pressure, so as to eliminate the meandering phenomenon of the rolled sheet material.

[0005] A meandering control method for detecting the rolling load on the operation side (WS) and the driving side (DS) of the rolling roll and changing (leveling) the roll gap between the WS and the DS is based on a feed rate in the rolling of the passing material. If the speed is too fast, the delay in control timing becomes a serious problem and has not been put to practical use at present.

[0006]

The conventional meandering control method for a passing material has the following problems. That is, in the conventional meandering control method, since the threading material is rolled at the approximate center position of the rolling roll, the control is performed for the purpose of returning to the original center position. For this reason, a configuration is adopted in which the sheet passing material is once moved in the direction of the rolling center from the position shifted by meandering, and then the meandering speed is gradually reduced to zero. Therefore, in the meandering control in which the meandering speed increases rapidly once it occurs, there are uncertain factors, and in the presence of noise and response delay of the actual machine,
It is practically difficult to control the meandering speed to 0 and stop at the original rolling center position.

[0007] The present invention has been made in view of the above circumstances, and even if there is an indeterminate meandering factor of the passing material, it is possible to perform the meandering control accurately from the differential load applied to the passing material. It is an object of the present invention to provide a meandering control method at the tail end of a passing plate material.

[0008]

Means for Solving the Problems The present invention has the following structure in order to solve the above-mentioned problems. That is, the rolling load of the rolled strip material to be rolled and sent is detected, the difference load in the rolling load is obtained as an input value, and the leveling amount in the roll gap of the rolling roll is output as an output value and controlled. In the meandering control method at the tail end of a plate material, a first calculation term for calculating a difference calculation value based on a differential signal of the input value to be input, and a current value changed from a roll gap at a reference time by the input value to be input. A second calculation term for calculating a sum of a change amount in the roll gap and a leveling amount operated based on the previous output value as a detection calculation value for setting the roll gap state at the reference time; and the first calculation term. Meandering system that calculates and outputs the output value by using at least a difference calculation value obtained by the second calculation term and a detection calculation value obtained by the second calculation term. It was configured as a control method.

With this configuration, in the meandering control method at the tail end of the passing material, the first calculation term obtains the difference calculation value from the differential signal of the difference load. With it
The second calculation term is used to determine the roll gap changed from the reference time and the leveling operation amount operated based on the previous difference load change amount, and a detection calculation value for setting the level at the reference time. Then, the leveling operation amount of the roll gap is output as an output value using at least the difference calculation value and the detection calculation value. Therefore, when the difference load change amount with respect to the passing material is large, the value of the first calculation term is reflected in the output value, and when the difference load change amount with respect to the passing material is small, the value of the second calculation item is reflected in the output value. Acts to be.

Further, in the meandering control method at the tail end of the passing material, the second calculation term includes a first calculation term for calculating an elongation difference value due to a load on an operation side and a driving side of the rolling roll, and A second calculation term for calculating a comparison calculation value calculated from the output value and the current elongation difference value, and a third calculation term for calculating a reference calculation value indicating a difference between the comparison calculation value at the reference time. And

[0011] With this configuration, the meandering operation is performed once by reflecting the calculated difference value, the comparison calculation value, and the detection calculation value calculated from the reference calculation value on the output value. The leveling operation of the rolling roll can be performed so that the leveling operation amount of the rolling roll is set to the roll gap state at the reference time. Further, since the amount of change in the roll gap is determined based on the elongation change values on the driving side and the operation side of the rolling roll, an appropriate suppression effect can be provided. When calculating the detection calculation value, the value calculated from the difference in elongation and the previous output value may be calculated and calculated with the reference calculation value, or the value calculated from the difference in expansion and the reference calculation value may be calculated as follows: A configuration in which the value is calculated by calculating the output value may be used.

Furthermore, the passing material used in the meandering control method at the tail end of the passing material is an aluminum plate. With such a configuration, the meandering control of an aluminum plate having a slow rolling speed can be appropriately performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a flow of signal processing from an input value to an output value in a meandering control method, FIG. 2 is a block diagram showing a flow of signal processing for determining a reference calculation value at a reference time, and FIG. 4A and 4B are a schematic view and a front view, respectively, showing the meandering state of the passing material in the meandering control method.

First, as a meandering control method at the tail end of the threading material, here, in order to make the description easy to understand,
The configuration of the four rows of rolling rolls (see FIG. 3) will be described in the meandering control method of the last rolling roll. Further, each value used will be described simply. Further, in each figure, for convenience of explanation, a threaded plate material, a rolling roll, and the like are deformed and described.

As shown in FIGS. 1, 3, and 4, meandering control method A controls the meandering of a tail end Wt of an aluminum plate W which is a threaded material by a rolling roll 5, and here, rolling is performed. The time when the tail end Wt of the aluminum plate W passes through the roll 2 is set as a reference time (at the time of lock-on), the rolling load on the rolling roll 5 is continuously detected, and the difference load variation in the rolling load is input value Nv. And the leveling operation amount of the rolling roll 5 is output as an output value Ov from the first calculation term 10 and the second calculation term 20 and used for control. In addition, the roll gap G at the time of the reference is preferably such that the gap difference between the operation side (DS) and the drive side (WS) of the rolling roll 5 is zero. It may be input from the state where it is in.

As shown in FIGS. 1 and 4 (a) and 4 (b), the input value Nv used in the meandering control method A is the difference load (T (ton)) in the detected rolling load of the rolling roll 5. Becomes Then, the difference between the previous load and the current load of the difference load is calculated as the difference calculation value Dv using the first gain in the first calculation term 10, and the difference load for the current load is calculated as the DS of the rolling roll 5. A detection calculation value Fv is obtained using an elongation difference value Pv calculated from WS, a previous output value (leveling command value) Ovb, and a gap difference calculation value Cvr at lock-on, and the difference calculation value Dv and the detection calculation value Fv are detected. The output value Ov is calculated using at least the calculated value Fv.

As shown in FIG. 1, an input value Nv (differential load)
Is input, first, in the first calculation term 10, the difference calculation value Dv is calculated using the addition point 11, the roll gap calculation unit 12, and the first gain A1. In this method, a difference calculation value Dv is calculated as a differential signal from the input value Nv using a signal regarding the difference between the previous and current difference loads.

Therefore, when the input value Nv (difference load) is input, the difference between the previous and current difference loads is calculated at the addition point 11. For the calculated difference, the roll gap calculating unit 12 uses the mill stiffness coefficient to calculate how wide the roll gap G has been in the control cycle before the change, that is, how much the gap change amount is. To calculate. Further, the first gain A1 is integrated with the gap change amount to calculate a difference calculation value Dv. In addition, the first gain A1 is determined by a rolling speed, a sheet thickness,
What is necessary is just to give as a function, such as a rolling load.

On the other hand, as shown in FIG.
Is a DS / WS change amount calculation unit 21 (first calculation term) that receives the value of the difference load change amount for the current time and calculates an elongation difference value Pv that is a gap difference between DS and WS of the rolling roll 5; Previous output value (leveling command value) Ovb and rolling roll 5
Detection and calculation using a previous leveling amount command value addition unit 26 for calculating a gap difference between the roll gap G and a reference time gap difference calculation unit 28 for calculating a gap difference of the roll gap G at the reference time (at lock-on). The value Fv is calculated.

That is, when the value of the difference load for this time is input to the second calculation term, the DS / WS change amount calculation section 21
Gap change amounts (elongation difference values Pv) are calculated by calculating respective elongation amount values (elongation change values DCv, WCv) in the S calculation unit 23 and the WS calculation unit 24. Therefore, first, the value of the difference load change amount for the current time is added to the sum load input to the sum load input unit 22, and the signs “+” and “−” are added at the matching points 23a and 24a. The DS load and the WS load are calculated by the calculation units 23b and 24b.

Then, the elongation change values (DCv, DSv) of the DS and WS are calculated by using the respective mill stiffness coefficients by the elongation amount calculators 23c and 24c on the calculated DS load and WS load.
WCv) is calculated. Further, the respective elongation change values DCv and WCv are added at an addition point 25 to obtain an elongation difference value Pv (gap change amount). Here, the elongation difference value Pv is calculated by subtracting the WS elongation value WCv from the DS elongation value DCv.

Next, the previous leveling amount command value adding section 2
6 is output, the output value Ovb of the previous time (immediately before) is output to the summing point 27 (second calculation term).
The comparison calculation value Cv is calculated by adding v to the previous output value Ovb. Then, the lock-on gap difference calculation value Cvr input to the reference gap calculation unit 28,
The comparison calculation value Cv is calculated by the addition point 29 (third calculation term) to calculate the detection calculation value Fv.

The gap difference calculation value C at lock-on
vr is a value obtained by calculating a gap difference calculation value in the rolling roll 5 when the aluminum plate W has passed through the rolling roll 2 as shown in FIGS. 2 and 4. That is, the value of the input differential load is determined by the DS calculator 23 and the WS calculator 2.
4, and the gap difference calculation value Cvr at lock-on is obtained. Here, the DS calculator 23 and W
The sign of “+” or “−” is added from the sum load input unit 22 to each value of the difference load change amount distributed to the S calculation unit 24, and the sum load value is added. , The DS load and the WS load are calculated.

Then, as shown in FIG. 2 and FIG.
DS load for S load and WS load by respective mill stiffness coefficient
The value DCv, which is the amount of elongation, and the value WCv, which is the amount of WS elongation, are calculated, and the two values are added at the addition point 25 to calculate the elongation difference value Pv. At the addition point 27, the difference value Pv and the previous output value Ovb are added to calculate a comparison value Cv, that is, a gap difference calculation value Cv at lock-on.
r is calculated.

Here, the detected calculated value Fv is calculated by multiplying the obtained reference calculated value Sv by the second gain A2. Note that the second gain A2 may be given as a numerical value near 1.

Next, as shown in FIG. 1, the difference calculation value Dv calculated by the first calculation term 10 and the detection calculation value Fv calculated by the second calculation term 20 are added by an addition point 30. The output value Ov, which is the command value of the leveling amount of the rolling roll 5, can be calculated by adding and adding the previous leveling amount command value Lv at the addition point 32. Therefore, the gap operation amount of the rolling roll 5 is controlled by the output value Ov, and the D value of the rolling roll 5 is controlled.
The meandering control of the aluminum plate W can be performed by adjusting the rolling loads of S and WS.

Each of the additional points 11, 23a, 24
For a, 25, 27, 29, 30, and 32, the addition and subtraction of "+" and "-" for calculation are determined in advance. Here, if "-" is finally calculated as the output value Ov, , DS, and WS is closed when “+” is calculated as the output value Ov.

When the aluminum plate W is controlled using the meandering control method A, an image as shown in FIG. 6 is obtained. 6 (a), 6 (b), 6 (c) and 6 (d) are schematic views schematically showing the front state of the rolling roll. That is, when the aluminum plate W moves to DS for the first time from the state of FIG. 6A to the state of FIG.
When the difference load change amount of S is generated, the roll gap G is largely operated to control the rolling roll 5 from the state of FIG. 6B to the state of FIG. 6C.

Therefore, the movement (meandering) of the aluminum plate W to the DS is suppressed. Then, when the next differential load is detected, the change in the differential load is small this time (because the meandering is suppressed). Is operated to control the state shown in FIG. 6C to the state shown in FIG. 6D. For this reason, as shown in FIG. 6D, the aluminum plate W is rolled at the position shown in FIG. Become.

FIG. 5 is a graph showing an example in which meandering control of an aluminum plate is performed by automatically applying the meandering control method.
FIG. 4 is a graph showing an example in which the operator performs meandering control manually. As shown in FIG. 5, it can be seen that when the meandering control method is used, the difference load variation is within a substantially constant numerical value range. On the other hand, as shown in FIG. 9, in the manual control by the operator, the amount of change in the differential load is indicated by a line having a large slope instead of being constant, and the aluminum plate meanders and is not sufficiently controlled. It turns out that it is. Therefore, as shown in FIG. 5, the fact that the difference load variation is within a certain range indicates that the meandering control of the aluminum plate is properly performed.

As described above, when the current input value Nv changes significantly from the previous time, the value of the difference calculation value Dv from the first calculation term 10 has a greater effect on the output value Ov,
If the previous and current input values Nv are close to each other,
The value of the detection calculation value Fv from the second calculation term 20 is the output value O
By performing the meandering control such that the influence on v is increased, it is possible to perform an appropriate rolling operation. Here, the meandering control for the rolling rolls 5 has been described, but it is also possible to perform the control for other rolling rolls or for each rolling roll.

[0032]

Next, the operation according to the control method of the present invention will be described based on specific numerical values as an example. Hereinafter, an embodiment of the present invention will be described using a meandering model based on specific numerical values with reference to FIGS. 3, 5 to 8. The present invention is, of course, not limited to this embodiment.

FIGS. 7A and 7B are block diagrams showing the flow of signal processing from an input value to an output value in the meandering control method. In the present embodiment, the detection time of the input value Nv is set to 0.3 second interval, and as shown in FIG. 7, the difference in rolling position between the operating side (WS) and the driving side (DS) is operated. .

As shown in FIGS. 7 (a) and 6 (a), first, when the previous leveling command value of the previous leveling amount command value adding section 26 is 0.009 mm, the previously detected difference load change amount Is 4 tons, the difference load difference detected this time is 18 tons, and lock-on (reference time)
The description will be made on the assumption that the gap difference is 0.07 mm.

As shown in FIG. 7A, when the input value Nv input is 22 tons, the roll gap calculation unit 12 calculates “1 / ｛mil stiffness coefficient (419.
2) / 2}, a value of 0.086 mm is calculated. Then, the calculated 0.086 mm is set to the first
Here, at the gain A1, a factor of 4 is integrated to obtain 0.344 mm as the difference calculation value Dv.

On the other hand, in the second calculation term 20, the DS / WS change amount calculation unit 21 calculates the input value Nv of 22 tons assuming that the total load is 1174 tons, and calculates the elongation amount. 1. The respective elongation change values DSv, WSv via the parts 23c, 24c, etc.
879 mm and 2.704 mm were determined, and the addition point 25
The value of 0.175 mm, which is the difference in elongation between DS and WS, is obtained from the above equation. Then, the value (0.009 mm in this case) from the previous leveling amount command value addition unit 26 is added, and 0.184 mm, which is the comparison calculation value Cv, is added to the reference time gap calculation unit 2.
Then, the calculated value Fv of 0.114 mm is calculated through 8 or the like.

The first calculation term 10 and the second calculation term 20
Is calculated by adding 0.344 mm as the difference calculation value Dv and 0.114 mm, which is the detection calculation value Fv, obtained by using the previous command value of the leveling amount previously input to the previous leveling amount command value adding unit 31. There is 0.00
By adding 9 mm, the output value Ov is -0.44.
Obtain 9 mm. This leveling operation amount is -0.44.
The operation of the roll 5 by 9 mm is shown in FIG. 6 (b) to FIG. 6 (c).

Next, as a result of operating the rolling roll 5 from the state shown in FIG. 6 (b) to the state shown in FIG. 6 (c), the movement of the aluminum plate W moving in a meandering manner is suppressed at the position shown in FIG. 6 (c). As a result, as shown in FIG. 7B, the value input as the next input value Nv was 22 tons.

The 22 tons are used in the same manner as in FIG.
When the output value Ov is obtained by calculating according to (b), -0.1
A value of 06 mm was obtained. Therefore, the roll 5 shown in FIG. 6 detects the calculated value Fv (−) of trying to cancel the leveling operation amount described above (to make the sum of the operated leveling operation amounts into the state of the roll gap at the reference time).
As a result of the operation with the output value Ov that greatly influences (0.343 mm), the state changes from FIG. 6C to FIG. 6D.

The states shown in FIGS. 6C to 6D are as follows.
As a result of the previous operation of the rolling roll 5, the amount of change in the differential load is such that the aluminum plate W is in a state in which the aluminum plate W tends to move in the opposite direction (WS), but becomes a roll gap state at lock-on. Roll 5 with output value Ov
6. The position where the aluminum plate W has moved by the operation of FIG.
(Position (c)). Further, by repeatedly performing the control shown in FIGS. 7A and 7B, the meandering control of the aluminum plate W is performed.

Accordingly, as shown in FIG. 7 (a), when the input value Nv is input as a value of 22 tons, the first calculation term 1
From 0 and the second calculation term 20, the difference calculation value Dv and the detection calculation value F
0.344 (mm) and 0.114 (mm) which are v, and -0.458 is calculated from these values.
(Mm). Then, the obtained −0.458 (m
m) is the previous leveling amount command value Lv of 0.009.
(Mm) and 0.449 (m
m). This output value Ov is a leveling command value of the rolling roll (DS reduction position-WS reduction position). FIG.
The state of (a) is synchronized with the state shown at the center of the graph of FIG.

Next, as shown in FIG. 7B, when the input value Nv is 22 tons, since the previous value and the current input value have not changed, the first calculation item 10 Then, the difference calculation value Dv becomes “0”. Also, the second calculation term 20
Then, the detection calculation value Fv becomes -0.343 (mm),
The previous leveling amount command value Lv of 0.449 (mm)
Are added to obtain -0.106 (mm) as the output value Ov. This output value Ov is a leveling command value of the rolling roll. The state of FIG. 7A is synchronized with the state shown on the right side from the center position of the graph of FIG.

As described above, when the aluminum plate is controlled by the meandering control method A shown in FIG. 7, as shown in FIG. 8, the amount of change in the difference load is within a certain range, and it is confirmed that the meandering control is properly performed. Show.

[0044]

As described above, the meandering control method according to the present invention has the following excellent effects. In the meandering control method, when the difference load change amount largely changes, the leveling operation amount is adjusted so as to stop the meandering of the passing material from the difference load change amount. Thereafter, the leveling operation amount operated and the roll gap state indicated by the sum of the change amount of the roll gap due to the difference load change amount from the reference time, so that the threaded sheet material does not meander by the leveling adjusted roll gap, By controlling the output value to reflect a calculated value for detecting the roll gap in the reference state, the roll gap is controlled to be in the reference state. Therefore, the meandering of the passing plate material can be reliably prevented.

In the meandering control method, since the amount of change in the roll gap can be accurately determined based on the change values on the driving side and the operating side of the rolling roll, the meandering control at the tail end of the threaded material can be appropriately performed. Can do it. When the passing material is an aluminum plate, the rolling speed is slow, so that the meandering control can be appropriately performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a flow of signal processing from an input value to an output value in a meandering control method of the present invention.

FIG. 2 is a block diagram showing a flow of signal processing for determining a reference calculation value at the time of reference according to the present invention.

FIG. 3 is a schematic diagram showing an arrangement state of rolling rolls in the meandering control method of the present invention.

FIGS. 4A and 4B are a perspective view and a front view showing a meandering state of a passing material in the meandering control method of the present invention.

FIG. 5 is a graph showing an example in which meandering control of an aluminum plate is performed by automatically applying the meandering control method of the present invention.

FIGS. 6 (a), (b), (c) and (d) are schematic views schematically showing a front state of a rolling roll in the meandering control method of the present invention.

FIGS. 7A and 7B are block diagrams showing a flow of signal processing from an input value to an output value of the meandering control method in the meandering control method of the present invention.

FIG. 8 is a graph showing an example in which meandering control of an aluminum plate is performed by applying the meandering control method of the present invention.

FIG. 9 is a graph illustrating an example in which an operator who is a conventional meandering control manually performs the meandering control.

[Explanation of symbols]

A meandering control method A1 first gain (correction term) A2 second gain Cv comparison calculation value Cvr comparison calculation value at lock-on Dv difference calculation value DCv extension change value (DS) Fv detection calculation value G roll gap Lv previous leveling amount Command value Nv Input value Ov Output value Ovb Previous output value Pv Elongation difference value Sv Reference calculation value WCv Elongation change value (WS) 10 First calculation item 11 Addition point (previous difference load and current difference load) Reference Signs List 12 roll gap calculation section 20 second calculation term 21 DS / WS change amount calculation section (first calculation term) 22 sum load input section 23 DS calculation section 23a, 24a addition point (of sum load) 23b, 24b calculation section 23c , 24c Elongation amount calculation unit 24 WS calculation unit 25 Addition point (of change value) 26 Previous leveling amount addition unit 27 Addition point (second calculation ) 28 baseline (lock-on) gap calculator 29 summing point (third calculating section) 30 summing point 31 previous leveling amount command value addition unit 32 summing point

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masanori Ikeda 15 Kinuigaoka, Moka-shi, Tochigi Prefecture Kobe Steel Moka Works F-term (reference) 4E024 AA06 CC01 CC02 EE01

Claims (3)

[Claims] The present invention detects a rolling load on a rolling roll of a sheet material to be rolled and fed, obtains a difference load in the rolling load as an input value, and outputs a leveling amount in a roll gap of the rolling roll as an output value. In the meandering control method at the tail end of the threading material to be controlled, a first calculation term for calculating a difference calculation value based on a differential signal of the input value to be input, and a roll gap at a reference time based on the input value to be input. A second calculation term for calculating the sum of the change amount in the changed current roll gap and the leveling amount operated based on the previous output value as a detection calculation value for setting the roll gap state at the reference time; and (1) calculating at least a difference calculation value by the calculation term and a detection calculation value by the second calculation term and outputting the output value; Meander control method in the tail end of the passing plate material and said and. 2. The second calculation term is a first calculation term for calculating an elongation difference value due to a load on the operating side and the driving side of the rolling roll, and is calculated from a previous output value and the current elongation difference value. 2. The method according to claim 1, further comprising: a second calculation term for calculating a comparison calculation value; and a third calculation term for calculating a reference calculation value indicating a difference between the comparison calculation value at a reference time.
3. A meandering control method at the tail end of the threading material according to item 1. 3. The meandering control method at the tail end of a passing plate material according to claim 1, wherein the passing plate material is an aluminum plate.