JPH0576367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a strip width control device applied to a tandem rolling mill (hereinafter referred to as tandem mill) for rolling a strip.

(Prior art) Strip width control in strip mills is mainly done by
Although it is mainstream to use a vertical rolling mill installed in a roughing mill, the width of the strip also changes due to various factors in the finishing mill downstream from the roughing mill. For this reason, attempts have recently been made to control the board width by using the edge between the finished stands, but even in this case, since the board is thin, it is not effective unless a certain amount of tension is generated between the stands. do not have. Therefore, tension setting and control are important and indispensable in controlling the plate width in a tandem mill.

Recently, attempts have been made to adjust the width of the strip at the exit side of the tandem mill to the target value by controlling the tension.
In that case, there is no method that considers the distribution of tension in the width direction and utilizes it for sheet width control.

When controlling the strip width with a tandem strip mill, the absolute value of the tension at the edge of the strip is particularly important for changes in strip width, but the distribution of that tension depends on the roll profile during rolling and the mill. It varies depending on factors such as the board profile on the entry side. Therefore, in order to improve the accuracy of strip width control in a tandem mill, it is necessary not only to deal with the average tension, but also to understand the roll profile that changes moment by moment during rolling, and also by knowing the tension distribution. It is necessary to control changes in plate width.

However, in the past, role profiles,
By clarifying the mutual relationship between tension distribution and the amount of change in plate width, we can understand the change in plate width of tandem mills, which is a comprehensive and complex phenomenon of these factors, and thereby improve the plate width accuracy of products. I couldn't find the technology I was trying to use.

(Problems to be Solved by the Invention) The reason why the conventional technology for controlling the strip width of tandem mills is limited to predicting changes in strip width using the average tension is that firstly, the strip width due to tension The problem is that it is difficult to directly separate the effects on changes, both in actual equipment and in experiments. That is, when the tension is changed, the rolling load is also changed, and thereby the roll profile is also changed. Also, the plate width and plate profile change depending on the tension. These phenomena act in combination to change the strip width at the exit side of the mill, so in order to predict this, each factor must be understood separately.

Second, the tension distribution in the width direction of the plate has only a small deviation from the average tension, and it is difficult to measure and understand this. In other words, although the amount of deviation of the tension distribution from the average tension is small, the difficulty lies in the fact that the various variables that change due to this, especially the amount of change in the sheet width on the exit side, are large enough that they cannot be ignored.

Therefore, an object of the present invention is to provide a tandem mill that determines the distribution of tension across the sheet width and changes the shape of this tension distribution to accurately match the width of the sheet at the exit side (product width) to the target value. The purpose of the present invention is to provide a board width control device.

[Structure of the invention]

(Means for Solving the Problems) To achieve the above object, the present invention provides an apparatus for determining a tension distribution pattern in the width direction of a rolled material between two adjacent stands in a tandem mill;
A device for determining the outlet side plate width of the upstream stand of the two stands, and a device that calculates the plate width change between the two stands and the plate width of the upstream stand based on the tension distribution pattern and the upstream stand outlet side plate width. A device for calculating the width expansion amount of the inner plate of the roll bite of the downstream stand, and a predetermined width of the exit side plate of the downstream stand based on the amount of change in plate width between the stands and the amount of width expansion of the inner plate of the roll bite. and a device for controlling the tension between the stands so as to match the target exit side width of the board.

(Function) In a device configured in this way, by determining the tension distribution pattern in the board width direction, the influence of the tension distribution pattern can be evaluated by the amount of width expansion and width change in each area such as within the cutting tool and between the stands. can be considered in the calculation. Therefore, it is possible to accurately determine the strip width after rolling, and tension control is performed using this highly accurate predicted strip width.
It is possible to improve the accuracy of the plate width of the obtained product.
In other words, compared to the case where the average tension is used, the amount of width expansion and width change is determined using the tension distribution pattern, so for example, when controlling the shape and operating a bender, etc., the roll crown will change. It is thought that the plate width changes, but this change in plate width can be absorbed through changes in the tension distribution pattern, which improves the accuracy of the product plate width and also reduces the longitudinal width of the plate. A stable and predetermined plate width is achieved over the entire length of the product.

(Example) The present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram of an embodiment of a board width control device according to the present invention. In Figure 1, 1 is i
Stand mill, 2 is (i-1) stand mill,
The material to be rolled flows from (i-1) stand 2 to i-stand mill 1 . Between the i-stand 1 and the (i-1) stand 2, an average tension (unit tension) of _i is generated in the material to be rolled, and this average tension _i is transferred to the looper 5 via the looper 5. It is detected as a downward force by the installed load cell 6, and i・(i-1) using a downward force etc.
By a predetermined calculation in the inter-stand tension detector 9,
It is determined as a tension value. Also, both stands 1 and 2
The rolling load and bender load of each stand during rolling are detected by the load cells 3 and 4 respectively installed in , and from these detected values, the rolling load and bender load calculators 12 and 13 calculate the rolling loads P _i , P _{i -1} and bender loads P ^B _i and P ^B _i-1 are detected separately. These rolling loads P _i , , P _i-1 and bender loads P ^B _i , P ^B _i-1 and the output C ^O _Ri of the initial roll crown setting values 14 and 15,
Using C ^O _Ri-1 , a roll crown calculator 16,
17, the roll crowns C _Ri and C _Ri-1 of each stand 1 and 2 during rolling are calculated. Although the plate crown on the entry side of each stand is not considered here, if the plate crown is calculated by calculation, a more accurate roll crown value can be obtained if this is also taken into account.

Once the roll crowns C _Ri and C _Ri-1 during rolling are determined, the widthwise distribution pattern of tension in the vicinity of the rolls can be calculated using these. This will be illustrated based on experimental facts in which rolling was performed in an experimental tandem mill while generating tension between stands, and the distribution pattern of tension along the width of the plate was measured.

Figure 2 shows the work roll R and the rolled material S during rolling.
Figure 3a shows the tension distribution pattern when the roll crown is decreased as shown in Figure 2a, and the tension distribution pattern when the roll crown is increased as shown in Figure 2b. The pattern is shown in Figure 3b. In FIG. 3, the solid line is the actually measured tension distribution pattern, and the broken line is the average tension. In the case of decrease shown in FIG. 3a, as the average tension increases from C→B→A, the tension becomes higher at the center of the plate and lower at the ends of the plate compared to this average tension. At this time, the higher the average tension, the more the width expansion is suppressed both between the stands and within the tool, but since the tension at the end is lower than the average tension, compared to when calculating using the average tension, The amount of width expansion increases slightly. In the case of the increase shown in FIG. 3b, as the average tension increases from F to E to D, the tension becomes lower at the center of the plate and higher at the ends of the plate compared to the average tension. At this time, similarly, the higher the average tension, the more the width expansion is suppressed in both the areas between the stands and the inside of the tool, but since the tension at the end is higher than the average tension, the width expansion determined using the average tension is Width expansion is further suppressed compared to the amount of expansion. In this way, by knowing the average tension between the roll crown and the stand during rolling, the tension distribution pattern can be determined, and this tension distribution pattern can be used to change the strip width in each region between the stands and within the roll bite. Since the amount can be determined, the plate width can be controlled with high precision.

Returning to FIG. 1, the roll crown calculator 16,
Roll crown C _Ri during rolling calculated in 17,
Using C _Ri-1 and the average tension _i between the stands,
Tension distribution patterns Δt ⁱ and Δt ^di _-1 near the roll are determined by tension distribution calculators 18 and 19. The calculation of this tension distribution can be performed by applying a model formula configured using the roll crowns C _Ri and C _Ri-1 and the average tension _i . The model formula is determined, for example, as follows. First, a rolling experiment is conducted, in which a rolled material with strain gauges attached at various positions in the width direction of the plate is rolled under tension, and the strain distribution pattern in the width direction of the plate is measured. This experiment is conducted under various roll crown conditions to obtain strain distribution patterns under each condition. Then, by analyzing this experimental data, the flatness y ^* of the rolled material is determined by an appropriate function,
For example, it is determined in the form of a linear quartic equation, y ^* = λ ₁ Z + λ ₂ Z ² + λ ₃ Z ³ + λ ₄ Z ⁴ . Here, λ ₁ to λ ₄ are functions of the roll crown C _Ri , Z is a position in the board width direction normalized by the board width, -1≦Z≦1, and Z=0 at the center. Once the flatness y ^* has been determined as a function of the roll crown and the position in the sheet width direction, the tension distribution pattern Δt ^d _i can be determined as a function of the flatness y ^* and the average tension _i , for example, using the following equation. represent.

Δt ^d _i = _i (1+y ^* ) Instead of using such a model formula, an optimal tension distribution pattern may be stored inside the tension distribution calculators 18 and 19, and that pattern may be applied. In that case, first conduct a rolling experiment as described above under various conditions of roll crown and average tension, analyze the experimental data to determine the tension distribution pattern, and compare this with each condition (for example, about 20 types). (by condition) and stored in the memories in the computing units 18 and 19. During actual rolling, the tension distribution pattern with the conditions closest to the roll crown and average tension at that time is read out from the memory, and this is used as it is, or by applying appropriate interpolation to it, and used as the optimal tension distribution pattern. Will be using it.

Regardless of which method is adopted, since the target is from (i-1) stand 2 to i-stand 1, the tension distribution pattern is (i-1) stand 2.
For i-stand 2, the tension distribution Δt ^d _i-1 on the exit side is determined, and for the i-stand 2, the tension distribution Δt ^d _i on the inlet side is determined.

Separately, (i-1) find the board width B ^E _i-1 on the stand entry side using the board width meter 10 and board width detector 11,
This entry side plate width B ^E _i-1 and the tension distribution pattern Δt ^d _i-1
Using this, the width expansion amount ΔB ^b i- ₁ in the roll bite of the stand 2 (i-1) is determined by the plate width expansion amount calculation unit 22 in the tool bit. Next, (i-1) Add the roll bite inner plate width expansion amount ΔB ^b _i-1 of stand 2 and the entrance side plate width B ^E _i-1 using the adder 24, and (i-1) Find the side plate width B ^D _i-1 .

Next, this (i-1) stand exit side plate width B ^D _i-1
and using the tension distribution patterns Δt ^d _i-1 and Δt ^d _i ,
The inter-stand plate width change amount calculation unit 20 calculates i.
(i-1) Calculate and find the plate width change amount ΔB ^S _i between stands, and add this inter-stand plate width change amount ΔB ^S _i and the above (i-1) stand exit side plate width B ^D _i-1 The board width B ^E _i on the entry side of i-stand 1 is obtained.
Next, using this i-stand entrance board width B ^E _i and the tension distribution pattern Δt ^D _i , the board width expansion amount ΔB in the roll tool of the i-stand 1 is calculated by the board width expansion amount calculation unit 21 in the roll tool of the i-stand 1. Find ^b _i . The adder 25 adds this plate width expansion amount ΔB ^b _i and the inlet side plate width B ^E _i of the i-stand 1 to obtain the outlet side plate width B _i of the i-stand 1.

The calculations during this time can be expressed as follows.

ΔB ^b _i-1 = f ^b (B ^E _i-1 , Δt ^d _i-1 , H _i-1 , H _i , R ^b _i-1 ,…) ΔB ^S _i = f ^s (B ^D _i-1 , Δt ^d _i-1 , Δt ^d _i , H _i , R ^S _i ,…) ΔB ^b _i = f ^b (B ^E _i , Δt ^d _i , H _i , H _i+1 , R ^b _i ,…) B ^D _i-1 =B ^E _i-1 +ΔB ^b _i-1 B ^E _i =B ^D _i-1 +ΔB ^S _i B ^D _i =B ^E _i +ΔB ^b _iHere , f ^b ( ) is the width within the roll bite This is the model formula for calculating the spread amount ΔB ^b _i .
In addition to B ^E _i and the tension distribution Δt ^d _i , for example, the average plate thickness H _i on the inlet side of the i-stand, the average plate thickness H _i+1 on the outlet side, the average deformation resistance R ^b _i during rolling on the i-stand, etc. It is composed of Similarly, f ^s ( ) is i・(i−
1) In the model formula for calculating the amount of width change ΔB ^S _i between stands, (i-1) Stand exit width B ^D _i-1 , (i
-1) In addition to stand exit side tension distribution Δt ^d _i-1 , i stand entrance side tension distribution Δt ^d _i , (i-1) average plate thickness H _i on stand exit side, i・(i-1) between stands It is constructed using the average deformation resistance R ^S _i etc. f ^b ( ), f ^s
A specific example of ( ) is as follows.

f ^b ( ) = B ^E _i-1・a {(H _i-1 − H _i ) H _i-1 } ^b a=a ₁ (B ^E _i-1 /H _i-1 ) ² + a ₂ (B ^E _i-1 /H _i-1 )+a ₃ b={b ₁ (B ^E _i-1 /H _i-1 )+b ₂ }C c=c ₁ (Δt ^d _i-1 /R ^b _i-1 ) ² +C ₂ (Δt ^d _i-1 / R ^b _i-1 ) + c ₃ f _s ( ) = B ^D _i-1・{1−a (Δt ^d _i /R ^s _i ) ^b・(Δt ^d _i-1 / R ^s _i ) ^c } a=a ₁ (B ^D _i-1 /H _i ) ² +a ₂ (B ^D _i-1 /H _i )+a ₃ b=b ₁ (B ^D _i-1 /H _i )+b ₂ c=c ₁ (B ^D _i-1 /H _i ) + c ₂ where a ₁ , a ₂ , a ₃ , b 1 , b ₂ , b _{3 ,} c ₁ , c ₂ , c ₃
is a constant unique to each expression and each stand. still,
The basic structure of the above formula is conventionally known.

The i-stand outlet side plate width B ^D _i obtained in this way is compared with the outlet-side target plate width B ^* _i set by the i-stand outlet side target width setting device 26, and based on the deviation ΔB _i ΔB _i The amount of change Δ _i in the average tension necessary for the value to become 0 is determined by the amount of change in tension calculator 27 .
Using this tension change amount Δ _i and the detected value _i of the inter-stand tension, the tension control calculator 28 changes the speed of (i-1) stand 2 and controls the inter-stand tension to the calculated tension. in order to,
(i-1) Find the stand speed standard N ^* _i-1 . Then, based on this speed reference N ^* _i-1 , the speed regulator 8 controls the speed of the main motor motor 7 of the (i-1) stand 2. By this speed control, the average tension is corrected, and the roll profile changes accordingly, so the shape of the tension distribution pattern is also corrected, and as a result, an appropriate tension distribution pattern that makes the plate width deviation ΔB _i = 0 is created. achieved. In other words, the tension change amount calculator 27 determines the average tension change amount Δ _i so that such an appropriate tension distribution pattern is achieved. the result,
Plate width deviation ΔB _i = 0, i stand outlet side plate width B ^D _i
will match the output side target plate width B ^* _i .

The control of the tension change amount calculator 27 and the tension control calculator 28 is shown in more detail in FIG. 5. That is, the tension change amount calculator 27 performs a predetermined PI calculation on the plate width deviation ΔB _i to convert it into an average tension correction amount Δ _i . Subsequently, within the tension control calculator 28, this average tension correction amount Δ
_i and the detected average tension value ^NEW _i to obtain a new average tension target value ^NEW _i . Next, the current average tension target value ^REF _i is subtracted from this Shinpei tension target value ^REF _i to obtain the correction amount Δ ^REF _i of the average tension target value. Next, this average tension target value correction amount _Δi is
A PI calculation is performed to convert this into (i-1) stand speed correction amount ΔN _i-1 . And this (i
-1) Add the stand speed correction amount ΔN _i-1 and (i-1) stand speed detection value N _i-1 to obtain (i-1)
Find the target value of stand speed N ^* _i-1 . Then, according to this (i-1) stand speed target value N ^* _i-1 ,
Speed regulator 8 is (i-1) stand speed
Adjust N _i-1 . By adjusting this (i-1) stand speed, for example, (i-1) stand speed N _i-1
If the average tension i decreases, the average tension _i increases, and (i-
1) If the stand speed N _i-1 increases, the average tension _i
decreases, and at the same time, the tension distribution pattern also changes as the average tension increases or decreases, which modifies the plate width B ^D _i . By this feedback control, (i
-1) The stand speed adjustment is continued until the plate width deviation ΔB _i becomes zero, so as a result, the plate width
B ^D _i comes to match the target board width B ^* _i . Note that the optimum value for the gain of the above PI calculation must be found by performing a test run and adjusting the value.

In this way, in this example, when calculating the width change amount and width expansion amount required for width control, the width This makes it possible to improve control accuracy.

By the way, in this embodiment, the average inter-stand tension t _i is detected using the looper 5 and the load cell 6 set in the looper, but it is also possible to rely on a tension detection device other than the looper, Detection may be performed separately at multiple locations in the board width direction, such as at the center or at the center. When tension is detected at multiple locations in this way, it is also possible to directly determine the tension distribution pattern from the detected values.

In addition, although the tension is controlled by controlling the speed of (i-1) stand 2, it is of course possible to control the tension by controlling the speed of i-stand 1 or using a looper. .

In addition, in this embodiment, (i-1) the exit side board width B ^D _i-1 of the stand 2 is (i-1) the entrance side board width of the stand 2
The configuration is such that it is calculated from the detected value of B ^E _i-1 and (i-1) the plate width expansion amount ΔB ^b _i-1 in the roll bite of stand 2. However, in tandem mills, the plate width detector 10 can normally be installed only on the inlet side of the most upstream stand and the outlet side of the most downstream stand, and it is difficult to install it between intermediate stands. Therefore,
This embodiment is a preferred embodiment when (i-1) stand 2 is the most upstream stand. In that case,
(i-1) In the stand board width control, the i-stand exit-side board width B ^D _i calculated in this embodiment is used as the exit-side board width of the preceding stage stand, that is, the i-stand.
Similarly, after the (i+1) stand,
The output side board width of the front stage stand calculated by the board width control of the front stage stand is used.

Further, as the exit side plate width of the front stage stand, it is also possible to use the output side target board width setting value for the front stage stand, without using the output side board width calculation value in the front stage stand as described above. FIG. 4 shows an embodiment employing such a configuration.

As shown in FIG. 4, the downward load of the looper 5 is detected by the load cell 6, and using the detected value, the average tension _i on the inlet side of the i-stand 1 is determined by the i-stand inlet tension detector 9. , Separately, the rolling load/bender load detector 12 detects the detected values from the load cell 3 installed on the i-stand as the rolling load P _i and the bender load P ^B _i , and sets the set value C ^O of the initial roll crown setting device 14. Using _Ri , the rolling load P _i and the bender load P ^B _i , roll crown calculator 1
6, determine the roll crown C _Ri during rolling.
Then, using the roll crown C _Ri and the average tension _i , the tension distribution pattern Δ ^d _i is determined by the tension distribution calculator 18 in the same manner as in the previous embodiment.

Separately, (i-1) stand exit side target plate width B ^* _i-1 set by (i-1) stand exit side width target value setter 29 (or (or (i-1) as in the previous embodiment) (i-1) Stand exit side plate width calculated on the stand
B _i-1 ) and the tension distribution pattern Δ ^d _i , the inter-stand plate width change amount calculating unit 20 calculates the inter-stand plate width change amount ΔB ^S _i . An adder 30 adds the inter-stand plate width variation ΔB ^S _i and the (i-1) stand exit target plate width B ^* _i-1 to determine the i-stand entrance plate width B ^E _i . Using the i-stand entry side plate width B ^E _i and the tension distribution pattern Δ ^d _i , calculate the roll bit inner plate width expansion amount ΔB ^b _i of the i-stand 1 using the bit inner plate width expansion amount calculation unit 21, The adder 31 adds this ΔB ^b _i and the inter-stand board width variation ΔB ^S _i to obtain the board width variation ΔB _i between the (i-1) stand exit side and the i-stand exit side.

Separately, the i-stand exit side board width actual measurement value B ^a _i obtained by the board width meter 10 and board width detector 11 installed on the exit side of the i-stand 1, and the i-stand exit side target board width setting device 2
i stand exit target plate width B ^* _i set by 6
and find the deviation ΔB ^a _i . Then, using the width change amount ΔB _i and this deviation ΔB ^a _i , the tension change amount calculator 27 calculates the average tension change amount Δ _i necessary for ΔB ^a _i =0, and this average tension Using the amount of change Δ _i and the average tension _i , the tension control calculator 28 calculates the i-stand speed reference N ^* _i
is determined and outputted to the i-stand speed regulator 8 to control the i-stand main engine motor to achieve a predetermined average tension. As a result, the i-stand exit width B ^a _i matches the target width B _i , and a product with good width accuracy can be obtained, as well as a product with a stable board width throughout the longitudinal direction of the board.

In this embodiment as well, the width expansion amount ΔB ^b _i in the cutting tool,
In order to obtain the width variation ΔB ^S _i between stands, not only the average tension _i but also the tension distribution pattern Δ ^d _i is used, making it possible to accurately predict the board width.

By the way, in this embodiment, the outlet side plate width B ^a _i of the i-stand 1 is detected, and tension control is performed based on this and the plate width change amount ΔB _i determined based on the tension distribution pattern. However, this configuration is suitable for stands close to the most downstream stand. That is,
As mentioned above, the board width meter 10 can usually be installed only on the entrance side of the most upstream stand or the exit side of the most downstream stand, so in stands near the most downstream stand, the most downstream stand outlet board that can be detected is This is because it is preferable to perform control based on the width.
Therefore, the configuration of this embodiment is a preferred embodiment when the i-stand 1 is the most downstream stand. In addition, for the stands upstream from i-stand 1, the amount of plate width change from that stand to the most downstream stand is calculated in the same way, and tension control is performed based on this and the actual measured value of the outlet side plate width of the most downstream stand. can be done.

〔Effect of the invention〕

As described above, according to the present invention, the tension distribution pattern is incorporated into the calculation of the width change amount, and in the calculation of the width change amount, the tension distribution pattern has a different influence on the inter-stand width change. Since the amount and the amount of change in width within the tool are calculated separately, changes in sheet width can be predicted with high accuracy, making it possible to obtain products with good width accuracy. It is possible to provide an extremely useful sheet width control device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a diagram showing a case where the roll crown is decreased and b when the roll crown is increased, and Fig. 3 is a tension distribution when the roll crown is decremented. FIG. 4 is a block diagram of another embodiment of the present invention, and FIG. 5 is a diagram showing the tension distribution pattern b in the case of increase. FIG. FIG. 3 is a block diagram showing details. 1... i stand mill, 2... (i-1) stand mill, 3, 4, 6... load cell, 5... looper, 7... main motor motor, 8... speed regulator, 9... i・( i-1) Inter-stand tension detector,
10...Plate width meter, 11...Plate width detector, 12...
Rolling load/bender load detector, 13... Rolling load/bender load detector, 14, 15... Initial roll crown setting device, 16, 17... Roll crown calculator, 18, 19... Tension distribution calculator, 2
0, 22... Inter-stand plate width change amount calculator, 21
...Inner tool plate width expansion amount calculator, 23, 24, 2
5, 30, 31...Adder, 26...i stand output side target plate width setting device, 27...Tension change amount calculator, 28...Tension control calculator, 29...(i-
1) Stand exit target board width setting device.

Claims (1)

[Claims] 1. In a tandem rolling mill, a device for determining the tension distribution pattern in the width direction of a rolled material between two adjacent stands, and determining the width of the exit side of the upstream stand of both the stands. Based on the device, the tension distribution pattern, and the outlet side plate width of the upstream stand, the plate width change amount between the two stands and the roll bite inner plate width expansion amount of the downstream stand of both the stands are determined. Based on the computing device, the inter-stand plate width change amount, and the roll bite inner plate width expansion amount, both the above-mentioned 1. A strip width control device for a tandem rolling mill, comprising a device for controlling a tension distribution pattern of a material to be rolled between stands. 2. In the device according to claim 1,
The device for determining the tension distribution pattern includes a device that detects the average tension between the two stands, a device that detects the rolling load and bender load of the downstream stand, and a device that detects the average tension between the two stands, a device that detects the rolling load and bender load of the downstream stand, and a device that detects the average tension between the two stands. a device that calculates the roll crown of the downstream stand based on an initial roll crown setting value of the downstream stand; and a device that calculates the tension distribution pattern based on the roll crown and the average tension. Features a strip width control device for tandem rolling mills. 3. In the device according to claim 1,
The device for determining the tension distribution pattern includes a device for detecting tension at a plurality of locations in the width direction of the material to be rolled between the two stands, and a device for calculating the tension distribution pattern based on the tension at these locations. A strip width control device for a tandem rolling mill, characterized by: 4. In the device according to claim 1,
The device for determining the outlet side plate thickness of the upstream stand includes:
a device for detecting the entry side plate width of the most upstream stand of the tandem rolling mill; a device for determining the tension distribution pattern in the plate width direction of the rolled material between each stand from the most upstream stand to the upstream stand; Based on the tension distribution pattern and the inlet side plate width of the most upstream stand, calculate the amount of roll bite inner plate width expansion of each stand from the most upstream stand to the upstream stand and the amount of plate width change between each stand. and a device that calculates the outlet side plate width of the upstream stand based on the amount of plate width expansion within each roll bite, the amount of plate width change between each stand, and the inlet side plate width of the most upstream stand. A strip width control device for a tandem rolling mill, characterized in that: 5. In the device according to claim 1,
The device for determining the width of the exit side plate of the upstream stand includes:
A strip width control device for a tandem rolling mill, characterized in that the device is a device for setting a target strip width on the outlet side for the upstream stand. 6. In the device according to claim 1,
The device for controlling the tension distribution pattern calculates the outlet side plate width of the downstream stand based on the inter-stand plate width change amount, the roll bite inner plate width expansion amount, and the upstream stand outlet side plate width. a device;
A device for setting the outlet target plate width of the downstream stand, and a device that should be added to the average tension between the two stands based on the deviation between the downstream stand outlet target plate width and the downstream stand outlet plate width. 1. A strip width control device for a tandem rolling mill, comprising a device that calculates the amount of change in tension, and a device that operates the tension distribution pattern between the two stands based on the amount of change in tension. 7. In the device according to claim 1,
The device for controlling the tension distribution pattern includes a device for detecting the exit strip width of the most downstream stand of the tandem rolling mill, and a tension distribution pattern in the strip width direction between each stand from the most downstream stand to the downstream stand. and a device that calculates the amount of plate width expansion within the roll bite of each stand downstream from the downstream stand and the amount of plate width change between each stand based on the tension distribution pattern between each stand. , a device for calculating the outlet side plate width of the downstream stand based on the roll bite inner plate width expansion amount of each stand, the plate width change amount between each stand, and the outlet side plate width of the most downstream stand; a device for setting the outlet target board width of the downstream stand;
Calculating the amount of change in board width between the upstream stand exit side and the downstream stand exit side based on the amount of change in board width between both stands and the amount of spread of board width within the downstream stand roll bite. Based on the apparatus, the deviation between the downstream stand outlet side plate width and the downstream stand outlet target plate width, and the plate width change amount,
A tandem rolling mill comprising: a device for calculating the amount of change in tension to be added to the average tension between the two stands; and a device for manipulating the tension distribution pattern between the two stands based on the amount of change in tension. Plate width control device.