JPH0647420A - Automatic plate thickness controller for rolling mill - Google Patents

Abstract

PURPOSE:To obtain an automatic plate controller capable of holding the thickness of a rolled stock with high accuracy at a desired thickness. CONSTITUTION:The controller consists of a 1st computing element 6 computing the roll gap correction amount of a rolled stock 2 detected with a plate thickness detecting means 5, a rolled load deviation estimating device 7 estimating the variation of rolled load from the roll gap correction amount, a rolled load variation estimating device 7 estimating the rolled load variation from the roll gap correction amount, a 2nd computing element 8 computing a roll gap correction amount from a rolled load detecting means 3 estimated to be the rolled load given to the rolled stock 2 detected by a rolled load detecting means 3 and a roll gap controller 9 controlling the roll gap of a rolling mill 1 based on an added result of the roll gap correction amount from the 1st and 2nd computing elements 6,8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic plate thickness control device for a rolling mill which automatically controls the plate thickness of a rolled material rolled by the rolling mill.

[0002]

2. Description of the Related Art FIG. 14 is a schematic diagram showing a conventional automatic plate thickness control device for a rolling mill. In the figure, 51 is a rolling stand as a rolling mill comprising a pair of upper and lower rolling rolls 51a, 51a, and 52 is a rolling stand. A rolled material whose plate thickness is controlled by passing between the rolling rolls 51a, 51a, 53 is a load detector that detects a rolling load applied to the rolled material 52 at the rolling stand 51, and 54 is a detection signal from the load detector 53. A roll gap correction amount calculator for calculating the roll gap correction amount between the upper and lower rolling rolls 51a, 51a based on the predetermined rolling roll elastic coefficient, and 55 is a plate thickness detection for detecting the plate thickness on the inlet side or the outlet side of the rolling mill. And 56 is a roll gap for calculating a roll gap correction amount between the upper and lower rolling rolls 51a, 51a based on the detection signal from the plate thickness detector 55 and the target plate thickness. A positive amount calculator 58 is a roll gap for controlling the roll gap between the rolling rolls 51a and 51a according to the output of the adder 57, which is the sum of the calculation results of the roll gap correction amount calculator 54 and the roll gap correction amount calculator 56. It is a controller.

Next, the operation will be described. Now, as shown in FIG. 15, the plate thickness of the rolled material 52 on the inlet side of the rolling stand 51 is H, the plate thickness of the rolled material 52 on the outlet side of the rolling stand 51 is h, and the rolling detected by the load detector 53. When the load is F, the rolling stand 51
Assuming that the plate thickness H of the rolled material 52 on the inlet side of the rolling stock changes to H + ΔH, the rolling load F is F + ΔF ₀ , and the plate thickness h of the rolled material 52 on the outlet side of the rolling stand 51 is h + Δh _0.
Change to each. However, in FIG. 15, L is the rolling roll elastic modulus curve of the rolling stand 51, and l is the rolled material 5.
2 is a plasticity coefficient curve of 2.

If the rolling roll elastic coefficient curve L is regarded as a straight line in the vicinity of the rolling load F, its inclination, that is, the elastic coefficient M ₀ of the rolling roll 51a becomes constant, and the following equation is obtained.

Δh ₀ = ΔF ₀ / M ₀

At this time, if the roll gap S between the rolling rolls 51a, 51a is changed to S + ΔS ',

Δh = ΔF / M ₀ + ΔS '

[0008] That is, when the plate thickness of the rolled material 52 fed to the rolling stand 51 changes, the roll gap correction amount ΔS ′ is always

ΔS ′ = − ΔF / M ₀ (10)

The change control is performed so that This allows
Eventually,

ΔS '= ΔS ₁ ' = ΔF ₁ / M ₀

At this point, the plate thickness fluctuation Δh of the rolled material 52 on the outlet side of the rolling stand 51 becomes _zero from Δh ₀ , and the plate thickness of the rolled material 52 rolled by the rolling rolls 51a, 51a of the rolling stand 51. h can be kept constant.

Therefore, in the apparatus shown in FIG. 14, the load detector 53 always detects the rolling load acting on the rolled material 52 in the rolling stand 51, and when the rolling load fluctuates, the roll gap correction amount calculator is provided. At 54,
From the variation ΔF, the gap correction amount Δ
Calculate S '.

Further, the plate thickness detector 55 provided at the inlet side or the outlet side of the rolling mill detects the plate thickness of the rolled material 52, and the calculator 56 in the calculator 56 based on this plate thickness and the set plate thickness. An appropriate roll gap correction amount ΔS ″ is calculated. Then, the roll gap controller 58 receives the output of the adder 57 to which the calculation results from the roll gap correction amount calculators 54 and 56 are added, and the roll gap controller 58 in the rolling stand 51. The roll gap between the rolling rolls 51a, 51a is changed by ΔS ″.

As a result, the plate thickness of the rolled material 52 rolled by the rolling stand 51 can be maintained at a desired thickness.

FIG. 16 is a schematic configuration diagram showing a second conventional apparatus. The same parts as those in FIG. In FIG. 16, reference numeral 59 is a rear tension correction amount calculator for calculating the rear tension correction amount based on the detected plate thickness from the plate thickness detector 55 and the target plate thickness, and 60 is the calculator 5
A backward tension controller for controlling the backward tension of the rolling stand 1 based on the calculation result of 9 and 61 is a rolling stand or a roll in the preceding stage of the rolling stand 1.

In the second conventional apparatus, the roll gap correction amount ΔS 'is calculated in the same manner as the conventional apparatus shown in FIG. 14, and the roll gap is changed by the roll gap controller 58 which receives only this calculation result, and the plate thickness is changed. The detector 55 detects the plate thickness of the rolled material 52, and the calculator 59 calculates an appropriate backward tension correction amount ΔTb based on the detected plate thickness and the set plate thickness. Then, the rear tension controller 60 controls the roll 61 in response to the calculation result from the calculator 59, and changes the rear tension of the rolling stand 51 by ΔTb.

As a result, the plate thickness of the rolled material 52 rolled by the rolling stand 51 can be maintained at a desired thickness.

FIG. 17 is a schematic block diagram showing a third conventional apparatus, in which the same parts as those in FIG. In FIG. 17, 62 is a tension detector that detects the tension on the inlet side of the rolling stand 1, and 63 is a roll gap correction amount between the upper and lower rolling rolls that is calculated based on the detected tension from the tension detector 62 and the target tension. This is a roll gap correction amount calculator.

This third conventional apparatus calculates the roll gap correction amount ΔS 'similarly to the conventional apparatus of FIG. 14, and based on the detected tension value of the rolled material 52 obtained from the tension detector 62 and the target tension set value, The rolling roll 51 is adjusted so that the tension value of the rolled material on the inlet side of the rolling stand 51 becomes the target tension value.
The roll gap correction amount ΔS ″ between a and 51a is calculated. Then, the roll gap correction amounts ΔS ′ and ΔS ″ calculated by the calculators 54 and 63 are added by the adder 57. A control operation similar to that of the conventional device shown is performed.

FIG. 18 is a schematic configuration diagram showing a fourth conventional apparatus, which is different from the conventional apparatus shown in FIG. 16 in a plate thickness detector 55.
The other configurations and operations are the same except that the rolling stand 51 is disposed on the inlet side. Therefore, duplicate description will be omitted.

FIG. 19 is a schematic configuration diagram showing a fifth conventional device. The same parts as those in FIGS.

In the fifth conventional apparatus, the load detector 53 always detects the rolling load acting on the rolled material 52 in the rolling stand 51, and when the rolling load fluctuates, the roll gap correction amount computing unit 54. , And the roll gap correction amount Δ from the variation ΔF according to the equation (10).
Calculate Sref. And the roll gap controller 5
8 receives the roll gap correction amount ΔS ′, which is the calculation result from the roll gap correction amount calculator 54, and changes the roll gap between the rolling rolls 51a and 51a in the rolling stand 51 by ΔS ′ based on the equation (10). Let me
Keep the plate thickness constant.

[0024]

Since the first conventional automatic plate thickness control device for a rolling mill shown in FIG. 14 is constructed as described above, the plate thickness detected by the plate thickness detector is used as a basis. The roll gap correction amount ΔS ”calculated based on the roll gap correction amount ΔS" and the roll gap correction amount ΔS 'calculated based on the rolling load fluctuation ΔF is simply added to control the roll gap. And ΔS ”interfere with each other.

Since the second conventional automatic plate thickness control device for a rolling mill shown in FIG. 16 is configured as described above, the backward tension calculated based on the plate thickness detected by the plate thickness detector. There is a problem that the roll gap correction amount ΔS calculated based on the correction amount ΔTb and the rolling load fluctuation ΔF interferes with each other.

Since the third conventional automatic plate thickness control device for a rolling mill shown in FIG. 17 is configured as described above, the roll gap correction amount ΔS ″ and the rolling load fluctuation ΔF obtained by the tension detector are also calculated. Roll gap correction amount calculated to and
The roll gap is controlled by a value obtained by simply adding S ', which causes a problem that the roll gap correction amounts ΔS' and ΔS "interfere with each other.

Since the fourth conventional automatic plate thickness control device for a rolling mill shown in FIG. 18 is configured as described above, when the front tension or the rear tension of the rolling stand changes, the rolling load changes. Therefore, there is a problem that the tension control system and the plate thickness control system interfere with each other.

Since the fifth conventional automatic plate thickness control device for a rolling mill shown in FIG. 19 is constructed as described above, when the front tension or the rear tension of the rolling stand fluctuates,
If the rolling load changes, and the plate thickness control system corrects the roll gap, the fluctuation in tension further increases, which causes the rolling load to change more and more.

As described above, each of the conventional automatic plate thickness control devices for rolling mills has a problem, and in order to solve this problem, the gains of the automatic plate thickness control and the tension control are reduced.
The precision is unavoidable.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an automatic plate thickness control device for a rolling mill capable of keeping the plate thickness constant without lowering the accuracy. To aim.

[0031]

According to a first aspect of the present invention, there is provided an automatic sheet thickness control device for a rolling mill, which rolls from the sheet thickness of the rolled material on the inlet side or the outlet side of the rolling mill detected by the sheet thickness detecting means. A first roll gap correction amount calculator for calculating a gap correction amount, a rolling load detection means for detecting a rolling load applied to the rolled material, and a rolling load for estimating a rolling load fluctuation from the calculated roll gap correction amount. A fluctuation estimator, a second roll gap correction amount calculator for calculating a roll gap correction amount from the detected rolling load and the estimated rolling load fluctuation value; and the first and second calculators. A roll gap controller for controlling the roll gap of the rolling mill based on the addition result of the roll gap correction amount.

According to a second aspect of the present invention, there is provided an automatic strip thickness control device for a rolling mill, which is rearward or forward from the rolling mill based on the strip thickness of the rolled material at the entrance side or the exit side of the rolling mill detected by the strip thickness detecting means. In the above, a tension correction amount calculator for calculating the tension correction amount of the rolled material, a rolling load detection means for detecting a rolling load applied to the rolled material, and a rolling load for estimating a rolling load variation from the calculated tension correction amount. A fluctuation estimator,
A roll gap correction amount calculator that calculates a roll gap correction amount from the detected rolling load and the estimated rolling load fluctuation value, and a roll gap of the rolling mill is controlled based on the calculated roll gap correction amount. And a tension controller that controls the tension behind or in front of the rolling mill based on the tension correction amount.

An automatic strip thickness control device for a rolling mill according to a third aspect of the present invention calculates the roll gap correction amount from the tension of the rolled material at the inlet side or the outlet side of the rolling mill detected by the tension detecting means. Roll gap correction amount calculator of
Rolling load detection means for detecting a rolling load applied to the rolled material, a rolling load fluctuation estimator for estimating a rolling load fluctuation from the calculated roll gap correction amount, the detected rolling load and the estimated rolling The roll gap of the rolling mill is calculated based on the addition result of the second roll gap correction amount calculator for calculating the roll gap correction amount from the load fluctuation value and the roll gap correction amount from the first and second calculators. And a roll gap controller for controlling.

According to a fourth aspect of the present invention, there is provided an automatic plate thickness control device for a rolling mill, which calculates a roll speed correction amount from the tension of the rolled material at the inlet side or the outlet side of the rolling mill detected by the tension detecting means. A correction amount calculator, a rolling load detecting means for detecting a rolling load applied to the rolled material, a rolling load fluctuation estimator for estimating a rolling load fluctuation from the calculated roll speed correction amount, and the detected rolling load. And a roll gap correction amount calculator that calculates a roll gap correction amount from the estimated rolling load fluctuation value, and a roll gap controller that controls the roll gap of the rolling mill based on the calculated roll gap correction amount. And a speed controller for controlling the roll speed based on the roll speed correction amount.

According to a fifth aspect of the present invention, there is provided an automatic plate thickness control device for a rolling mill, which calculates a roll velocity correction amount from the tension of the rolled material at the inlet side or the outlet side of the rolling mill detected by the tension detecting means. Correction amount calculator, rolling load detection means for detecting the rolling load applied to the rolled material, roll gap correction amount calculator for calculating the roll gap correction amount from the detected rolling load, and the calculated roll gap A roll gap controller that controls the roll gap of the rolling mill based on the correction amount, and a speed controller that controls the roll speed based on the roll speed correction amount are provided.

According to a sixth aspect of the present invention, there is provided an automatic plate thickness control device for a rolling mill, which is a tension correction amount for calculating a tension correction amount from the tension of the rolled material at the inlet side or the outlet side of the rolling mill detected by the tension detecting means. An arithmetic unit, a rolling load detecting means for detecting a rolling load applied to the rolled material, a rolling load fluctuation estimator for estimating a rolling load fluctuation from the calculated tension correction amount, the detected rolling load and the estimation. A roll gap correction amount calculator for calculating a roll gap correction amount from the calculated rolling load fluctuation value, a roll gap controller for controlling the roll gap of the rolling mill based on the calculated roll gap correction amount, and the tension And a tension controller for controlling the tension based on the correction amount.

According to a seventh aspect of the present invention, there is provided an automatic strip thickness control apparatus for a rolling mill, which estimates a rolling load variation from the tension of the rolled material at the inlet side or the outlet side of the rolling mill detected by the tension detecting means. An estimator, a roll gap correction amount calculator that calculates a roll gap correction amount from the detected rolling load and the estimated rolling load fluctuation value, and of the rolling mill based on the calculated roll gap correction amount. And a roll gap controller for controlling the roll gap.

[0038]

In the automatic strip thickness control device for a rolling mill according to the present invention, the roll gap correction amount ΔS "calculated based on the strip thickness of the rolled material detected by the strip thickness detector affects the rolling load. By calculating the influence ΔF ″ and calculating the roll gap correction amount S ′ based on the rolling load variation ΔF excluding the influence ΔF ″ in advance, the roll gap correction amount ΔS ′ and the same ΔS ″ interfere with each other. Without doing so, the plate thickness can be controlled to a desired thickness with high accuracy.

In the automatic strip thickness control device for a rolling mill according to the second aspect of the present invention, the influence of the rearward or forward tension correction amount ΔTb calculated based on the strip thickness detected by the strip thickness detector on the rolling load. By calculating ΔF ″ and calculating the roll gap correction amount ΔS based on the rolling load fluctuation ΔF excluding the influence of ΔF ″ in advance, the tension correction amount ΔTb
And the roll gap correction amount ΔS are prevented from interfering with each other.

In the automatic strip thickness control device for a rolling mill according to the third aspect of the present invention, the effect of the roll gap correction amount ΔS ″ calculated on the basis of the tension detected by the tension detector on the rolling load ΔF ″ is calculated. Then, the roll gap correction amount ΔS ′ is calculated based on the rolling load fluctuation ΔF in which the influence of ΔF ″ is removed in advance to prevent the roll gap correction amount ΔS ′ and ΔS ″ from interfering with each other.

In the automatic strip thickness control device for a rolling mill according to the inventions of claims 4 to 6, the rolling load fluctuation ΔF 'caused by the roll speed or roll gap correction performed based on the tension detected by the tension detector. And the roll gap correction amount ΔSref is calculated based on the rolling load fluctuation ΔF in which the influence of ΔF ′ is removed in advance, thereby avoiding the interference between the tension control system and the plate thickness control system.

According to the seventh aspect of the present invention, the automatic strip thickness control device for a rolling mill estimates the rolling load variation ΔF ′ caused by the tension variation detected by the tension detector, and obtains the rolling load variation ΔF obtained by the rolling load detector. By calculating the roll gap correction amount ΔSref based on the value obtained by removing the influence of ΔF ′ from, the plate thickness can be stably and accurately kept constant without increasing the tension fluctuation.

[0043]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the invention of claim 1, and in FIG. 1, 1 is a pair of upper and lower rolling rolls 1.
a, 1a is a rolling stand, 2 is a rolling roll 1a,
Rolled material whose plate thickness is controlled by passing between 1a, 3 is a load detector for detecting a rolling load applied to the rolled material 2 in the rolling stand 1, and 5 is an outlet side (or an inlet side) of the rolling stand 1. A plate thickness detector for detecting the plate thickness, 6 is a roll gap correction amount for calculating a roll gap correction amount ΔS ″ between the upper and lower rolling rolls 1a, 1a based on the detected plate thickness from the plate thickness detector 5 and the target plate thickness. An arithmetic unit, 7 is a rolling load fluctuation estimator that estimates the influence of the roll gap correction amount ΔS ″, which is the above calculation result, on the rolling load, and 8 is a detection signal from the load detector 3 and a predetermined rolling roll elastic coefficient and rolling. Estimated rolling load fluctuation value ΔF ”calculated by the load fluctuation estimator 7
A roll gap correction amount calculator for calculating the roll gap correction amount ΔS ′ between the upper and lower rolling rolls 1a, 1a based on the above, 4 is an adder for adding the roll gap correction amount ΔS ′ and the same ΔS ″, and 9 is an adder 7 Is a roll gap controller that controls the roll gap between the rolling rolls 1a and 1a according to the addition result ΔSref.

Next, the operation will be described. FIG. 1
5, the thickness of the rolled material 2 on the inlet side of the rolling stand 1 is H, the thickness of the rolled material 2 on the outlet side of the rolling stand 1 is h, and the rolling load detected by the load detector 3 is F. When the plate thickness H of the rolled material 2 on the inlet side of the rolling stand 1 changes to H + ΔH, the rolling load F is F + ΔF ₀ , and the plate thickness h of the rolled material 2 on the outlet side of the rolling stand 1 is h + ΔH. Changes to h + Δh ₀ , respectively. However, in the figure, L is the rolling roll elastic modulus curve of the rolling stand 1, and l is the plastic modulus curve of the rolled material 2.

Here, assuming that the rolling roll elastic coefficient curve L is a straight line in the vicinity of the rolling load F, its inclination, that is, the elastic coefficient M ₀ of the rolling roll 1a becomes constant, and the following equation is obtained.

Δh ₀ = ΔF ₀ / M ₀

At this time, when the roll gap S between the rolling rolls 1a, 1a is changed to S + ΔS ',

Δh = ΔS '+ ΔF / M ₀

It becomes That is, when the plate thickness of the rolled material 2 fed to the rolling stand 1 changes, the roll gap correction amount ΔS ′ is always

ΔS ′ = ΔF / M ₀ (1)

The change control is performed so that This allows
Eventually,

ΔS '= ΔS ₁ ' = ΔF ₁ / M ₀

At this time, the plate thickness variation Δh of the rolled material 2 on the outlet side of the rolling stand 1 becomes _zero from Δh ₀ , and the plate thickness of the rolled material 2 rolled by the rolling rolls 1a, 1a of the rolling stand 1 is reduced. Can be constant.

Further, the sheet thickness detector 5 provided at the inlet side or the outlet side of the rolling mill detects the sheet thickness of the rolled material 2 and calculates the roll gap correction amount based on this sheet thickness and the set sheet thickness. The plate thickness of the rolled material 2 rolled by the rolling stand 1 can be maintained at a desired thickness by calculating an appropriate roll gap correction amount ΔS ″ in the vessel 6.

Rolling for estimating how much the rolling load fluctuates when the roll gaps of the rolling rolls 1a, 1a are corrected based on the roll gap correction amount ΔS "obtained by the roll gap correction amount calculator 6 The load variation estimator 7 estimates the rolling load variation estimated value ΔF ″ caused by ΔS ″. And, instead of the equation (1), ΔS ′ is always

ΔS ′ = − (ΔF−ΔF ″) / M ₀ (2)

ΔS ′ is calculated by the roll gap correction amount computing unit 8 so that

ΔSref = ΔS ′ + ΔS ”(3)

Roll gap correction amount ΔSr represented by
ef causes the roll gap controller 9 to roll the roll 1.
By correcting the roll gap of a and 1a, Δ
The interference between S ′ and ΔS ″ can be prevented, and the plate thickness of the rolled material 2 can be kept constant at a desired thickness with high accuracy.

Example 2. It should be noted that, in the first embodiment, as shown in FIG.
In the above, using the roll gap correction amount ΔS ″ calculated by the calculator 6, the rolling load fluctuation estimated value ΔF ″ calculated by the rolling load fluctuation estimator 7, the elastic coefficient M ₀ of the rolling roll 1a and the rolling load fluctuation ΔF, The roll gap correction amount calculator 8 calculates the roll gap correction amount ΔS ′ by calculating the formula (2), and the addition of the formula (3) is performed to obtain the roll gap correction amount ΔSref. If the plasticity coefficient of the rolled material is Q, instead of equation (2),

ΔS ′ = M ₀ + Q {(ΔF−ΔF ″) / M ₀ + ΔS} / M ₀ + ΔS ... (4)

In the case where the roll gap correction amount calculator 8 calculates the roll gap correction amount ΔS 'and the ΔSref obtained by the above equation (3) is used as the roll gap correction amount, the same operation as in the first embodiment is performed. Has the same effect.

Further, in the above embodiment, appropriate tuning constants C ₁ and C are used instead of the expressions (2) and (4).
_{Using 2} , C ₃ and C ₄ ,

ΔS ′ = − C ₁ (ΔF−ΔF ″) / M ₀ (5)

Or

ΔS ′ = − M ₀ + Q / M ₀ · C ₂ {C ₃ (ΔF−ΔF ″) / M ₀ + ΔS} + C ₄ · ΔS (6)

Also in the case of the above, the same effect as the above embodiment can be obtained.

Example 3. FIG. 2 is a schematic configuration diagram showing an embodiment of the invention of claim 2, and the same parts as those in FIG. In FIG. 2, 10
Is a rear tension correction amount calculator for calculating a rear tension correction amount based on the detection signal from the plate thickness detector 5 and the target plate thickness, 11
Is a backward tension controller that controls the backward tension of the rolling stand 1 based on the calculation result in the computing unit 10, 12 is the rolling stand or roll in the preceding stage of the rolling stand 1, 13 is the backward tension correction amount computing unit 10 A rolling load fluctuation estimator that estimates the influence of the tension correction amount on the rolling load of the rolling stand 1, 14 is a detection signal from the load detector 3, a predetermined rolling roll elastic modulus, and a rolling load calculated by the rolling load fluctuation estimator 13. Top and bottom rolling rolls 1 based on estimated fluctuations
It is a roll gap correction amount calculator for calculating the roll gap correction amount Sref between a and 1a.

Next, the operation of this embodiment will be described. The operation of performing the calculation of the equation (1) is the same as in Example 1, but in this Example, the sheet thickness of the rolled material 2 is detected by the sheet thickness detector 5 provided on the outlet side of the rolling stand 1. An appropriate rear tension correction amount ΔTb is calculated in the calculator 10 based on the detected plate thickness and the set plate thickness. Then, the rear tension controller 11 receives the calculation result from the rear tension correction amount calculator 10 and changes the inlet side tension of the rolling stand 1 by the inlet side tension correction amount ΔTb, whereby the rolling stand 1
The plate thickness of the rolled material 2 rolled by can be maintained at a desired thickness.

Here, when the backward tension of the rolling stand 1 is corrected based on the backward tension correction amount ΔTb obtained by the calculator 10, the estimator 13 for estimating how much the rolling load in the rolling stand 1 varies. Estimate the rolling load fluctuation estimated value ΔF ′ caused by the inlet side tension correction amount ΔTb.

Then, instead of the equation (1), the roll gap correction amount calculator 14 calculates the equation (2) so that the roll gap correction amount ΔS is always ΔSref to obtain ΔSref. , The roll gap controller 9 determines the rolling rolls 1a, 1 based on the ΔSref.
By correcting the roll gap between the a and the inlet side tension correction amount ΔTb and the roll gap correction amount ΔS, interference can be prevented, and the plate thickness of the rolled material 2 can be kept constant at a desired thickness with high accuracy. .

In the above embodiment, an appropriate tuning constant C ₁ is used instead of the equation (2),

ΔSref = −C ₁ (ΔF−ΔF ′) / M ₀ (5) ′

The same effect as that of the above-described embodiment can be obtained even when the calculation of (1) is performed.

Example 4. It should be noted that in the above-described third embodiment, as shown in FIG.
In, the rolling load fluctuation estimated value ΔF ′ calculated by the rolling load fluctuation estimator 13 from the backward tension correction amount ΔTb calculated by the calculator 10, the elastic coefficient M ₀ of the rolling roll 1a, and the rolling load fluctuation ΔF are used.

ΔSref = − (ΔF−ΔF ′) / M ₀ (7)

The case where the roll gap correction amount calculator 14 obtains the roll gap correction amount ΔSref has been described. However, when the plastic coefficient of the rolled material is Q, instead of equation (7),

ΔSref = −M ₀ + Q {(ΔF−ΔF ′) / M ₀ + ΔS} / M ₀ + ΔS (8)

Even when ΔSref is obtained and the roll gap correction amount is obtained so that the same effect as in the third embodiment can be obtained.

Further, in the above embodiment, appropriate tuning constants C ₂ , C ₃ and C ₄ are used instead of the equation (8),

ΔSref = − (M ₀ + Q) / M ₀ · C ₂ {C ₃ (ΔF−ΔF ′) / M ₀ + ΔS} + ΔS (9)

Also in this case, the same effect as that of the above embodiment can be obtained.

Example 5. In the third and fourth embodiments, the case where the backward tension correction amount ΔTb is calculated based on the plate thickness detected by the plate thickness detector 5 provided on the outlet side of the rolling stand 1 has been described. As shown in FIG. 3, the strip thickness detector 5 is provided on the inlet side of the rolling stand 1, and the backward tension correction amount ΔTb is calculated based on the sheet thickness on the inlet side of the rolling stand 1, and In the case of calculating the rearward tension correction amount ΔTb to perform feedforward type plate thickness control based on the inlet side detected plate thickness, ΔT
The interference between b and ΔS can be prevented, and the plate thickness of the rolled material 2 can be kept constant at a desired thickness with high accuracy.

Example 6. In addition, in the said Examples 3-5,
When the rearward tension correction amount calculator 10 obtains the rearward tension correction amount ΔTb from the plate thickness obtained from the plate thickness detector 5 and the rearward tension is corrected based on the rearward tension correction amount ΔTb,
The rolling load fluctuation estimator 13 that estimates how much the rolling load in the rolling stand 1 fluctuates estimates the rolling load fluctuation estimated value ΔF ′, and then the formula (2) or (5) or the formula (3) or the formula (6) is obtained. The case where the roll gap correction amount ΔS is obtained based on the above description has been described.

Therefore, in this embodiment, as shown in FIG. 4, a front tension correction amount calculator 16 is provided in order to correct the front tension of the rolling stand 1 to obtain a desired strip thickness. When the front tension correction amount ΔTf calculated by the correction amount calculator 16 is obtained, the front tension of the rolling stand 1 is corrected by ΔTf by the front tension controller 17, and the front tension is corrected based on the front tension correction amount ΔTf. In addition, the rolling load fluctuation estimator 18, which estimates how much the rolling load in the rolling stand 1 fluctuates, estimates the rolling load fluctuation estimated value ΔF ′, and formula (2) or formula (5) or formula (3) or formula ( Since the roll gap correction amount ΔS is calculated based on 6), the case where the outlet side plate thickness of the rolling stand is controlled to a desired plate thickness by correcting the front tension Preventing interference of the front tension correction amount ΔTf and roll gap correction amount [Delta] S, it can be kept constant at the desired thickness of the plate thickness of the strip 2 with high accuracy.

Further, in Examples 1 to 4 described above, in order to control the backward tension or the forward tension of the rolling stand 1, the rolling speed of the preceding rolling stand 12 of the rolling stand 1 or the speed of the inlet side roll of the rolling stand 1 is controlled. Alternatively, a diagram for controlling the rolling speed of the post-rolling stand 19 of the rolling stand 1 or the speed of the exit side roll of the rolling stand 1 is shown, but in order to control the backward tension or the forward tension, the rolling speed of the rolling stand 1 is controlled. May be changed, a tension control device such as a looper may be used, or any method such as changing the roll gap of the rolling stand before or after may be used, and the same effects as those in Examples 1 to 4 are obtained.

Example 7. FIG. 5 is a schematic configuration diagram showing an embodiment of the invention of claim 3, and the same portions as those in FIG. In FIG. 5, 20
Is a tension detector for detecting the tension on the inlet side of the rolling mill, 21 is a roll gap correction amount calculator for calculating the roll gap correction amount between the upper and lower rolling rolls based on the detection signal from the tension detector 20 and the target tension, 22 is a rolling load fluctuation estimator for estimating the influence of the roll gap correction amount calculated by the roll gap correction amount calculator 21 on the rolling load of the rolling stand 1, and 23 is a detection signal from the load detector 3 and a predetermined rolling roll. This is a roll gap correction amount calculator for calculating the roll gap correction amount between the upper and lower rolling rolls 1a, 1a based on the elastic coefficient and the rolling load change estimated value obtained by the rolling load change estimator 22.

Next, the operation of the seventh embodiment will be described. The operation of calculating the equation (1) is similar to that of the first embodiment, but in this embodiment, the tension of the rolled material 2 and the target tension setting obtained from the tension detector 20 provided on the inlet side of the rolling stand are set. The roll gap correction amount calculator 21 calculates the roll gap correction amount ΔS ″ based on the value. Then, based on this roll gap correction amount ΔS ″, the rolling rolls 1a, 1
Roll stand 1 when the roll gap between a is corrected
The rolling load fluctuation estimator 22 that estimates how much the rolling load fluctuates in Eq. 1 estimates the rolling load fluctuation estimated value ΔF ″ caused by the roll gap correction amount ΔS ″.

Further, the load detector 3 constantly detects the rolling load acting on the rolled material 2 in the rolling stand 1, and when the rolling load fluctuates by ΔF, the roll gap correction amount calculator 23 causes Instead of the equation (1), ΔS ′ is obtained by the equation (2). Then, the roll gap correction amount ΔSref obtained by the above equation (3)
By the roll gap controller 9, the rolling rolls 1a,
By correcting the roll gap between the rolls 1a, the interference of the roll gap correction amount ΔS ′ and the same ΔS ″ is prevented, and the tension on the inlet side of the rolling stand is kept the same as the target tension setting value, and at the same time, the plate of the rolled material 2 is rolled. The thickness can be kept constant.

Further, instead of the equation (2) in the above embodiment, an appropriate tuning constant C ₁ is used, and the above (5)
Also in the case of using the formula, the same effect as that of the above-described embodiment is obtained.

In the seventh embodiment, the roll gap controller 9 controls the roll gap of the rolling stand 1 by using the added value of the roll gap correction amounts from the roll gap correction amount calculators 21 and 23. Based on the roll gap correction amount from the roll gap correction amount calculator 21,
In FIG. 5, the roll gap of the rolling stand (not shown) arranged on the left side of the tension detector 20 is controlled by a roll gap controller (not shown), and the roll gap correction amount calculator 23 is used to correct the roll gap. The roll gap of the rolling stand 1 may be controlled by the roll gap controller 9 based on only the amount.

Example 8. In the seventh embodiment, the rolling load fluctuation estimated value ΔF ″ calculated by the rolling load fluctuation estimator 22 and the rolling roll 1a of the rolling roll 1a are calculated from the roll gap correction amount ΔS ″ calculated by the roll gap correction amount calculator 21 in FIG. Using the elastic coefficient M ₀ and the rolling load fluctuation ΔF, the roll gap correction amount calculator 23 and the adder 24 perform the calculations of the formulas (2) and (3).
The output ΔSref of the above is used as the roll gap correction amount. However, when the plasticity coefficient of the rolled material is Q, the above equation (4) is calculated instead of equation (2),
After that, the same effect as that of the above-described seventh embodiment can be obtained when the calculation of the above formula (3) is performed.

Also, in the case of performing the calculation of the equation (6) using appropriate tuning constants C ₂ , C ₃ and C ₄ in place of the equation (4) in the above embodiment, the same as in the above embodiment. Produce the effect of.

Example 9. In addition, in the above-described Embodiments 7 and 8, the case where the roll gap correction amount ΔS ″ is calculated based on the tension detected by the tension detector 20 provided on the inlet side of the rolling stand 1 has been described. As shown in FIG. 6, a tension detector 25 is provided on the outlet side of the rolling stand 1 and the roll gap correction amount ΔS ″ between the rolling rolls 1 a and 1 a is set to the roll gap correction amount in order to control the tension on the outlet side of the rolling stand 1. The calculation by the calculator 26 prevents the interference of the roll gap correction amount ΔS ′ and the same ΔS ″ even when controlling the outlet side tension of the rolling stand 1.
The plate thickness of the rolled material 2 can be kept constant.

Example 10. FIG. 7 is a schematic configuration diagram showing an embodiment of the invention of claim 4, the same parts as those in FIG. In FIG. 7, 2
Reference numeral 7 is a roll speed correction amount calculator for calculating the roll speed correction amount from the tension detected by the tension detector 20, and 28 is a speed for controlling the speed of the rolling stand or roll 12 based on the roll speed correction amount from the calculator 27. The controller 29 is a rolling load fluctuation estimator that estimates the fluctuation of the rolling load from the roll speed correction amount from the calculator 27.

Next, the operation of the tenth embodiment will be described. In addition to performing the calculation of the equation (1), in this embodiment, the roll speed correction amount calculator 27 corrects the roll speed of the preceding stage of the corresponding rolling stand based on the tension of the rolled material 2 obtained from the tension detector 20 and the target tension set value. The amount Δv is calculated. And
The speed controller 28 corrects the roll speed of the rolling stand or the roll 12 based on the roll speed correction amount Δv. Further, the rolling speed variation estimator 29, which estimates whether the rolling load in the rolling stand 1 fluctuates to a degree when the roll speed is corrected based on the roll speed correction amount Δv, is caused by the roll speed correction amount Δv. The rolling load fluctuation estimated value ΔF ′ is estimated.

Further, the load detector 3 always detects the rolling load acting on the rolled material 2 in the rolling stand 1, and when the rolling load fluctuates by ΔF, the roll gap correction amount computing unit 14 Instead of the equation (1), the calculation of the above (7) is performed, and the roll gap controller 9 is calculated based on the obtained roll gap correction amount ΔSref.
By correcting the roll gap between the rolling rolls 1a, 1a, the interference between the tension control system and the plate thickness control system is prevented,
It is possible to control the tension on the inlet side of the rolling stand to the target tension set value with high accuracy and at the same time keep the plate thickness of the rolled material constant.

In the above-mentioned embodiment, the same effect as that of the above-mentioned embodiment can be obtained when the calculation of the above-mentioned expression (5) 'is performed by using an appropriate tuning constant C ₁ instead of the expression (2).

Example 11. In the above tenth embodiment,
In FIG. 7, the rolling load fluctuation estimated value ΔF ′ calculated by the rolling load fluctuation estimator 29 from the roll speed correction amount Δv calculated by the roll speed correction amount calculator 27, the elastic coefficient M ₀ of the rolling roll 1a, and the rolling load. The case of calculating the roll gap correction amount ΔSref by performing the calculation of the equation (7) using the variation ΔF has been described. However, when the plastic coefficient of the rolled material is Q, the equation (7) is used instead of the equation (7). 8) is used to calculate the roll gap correction amount by ΔS.
Also when ref is obtained, the same effect as that of the tenth embodiment is obtained.

Further, in the above-mentioned embodiment, when the appropriate tuning constants C ₂ , C ₃ and C ₄ are used in place of the expression (8) to perform the calculation of the expression (9), Has the same effect.

Example 12. In the tenth and eleventh embodiments, the rolling stand 1 is based on the tension detected by the tension detector 20 provided on the inlet side of the rolling stand 1.
The case where the roll speed of the rolling stand or the bridle roll of the preceding stage is corrected has been described, but the case where the roll speed of the rolling stand 1 is controlled by the speed controller 30 as in the invention of claim 5 shown in FIG. Also, similarly to the case of the tenth or eleventh embodiment, the interference between the tension control system and the plate thickness control system can be prevented, the tension can be controlled with high accuracy, and the plate thickness can be kept constant.

Example 13 In the tenth and eleventh embodiments described above, the tension control is performed by modifying the roll speed of the rolling stand or the roll 12, but as shown in FIG. Also in the case where the roll gap is controlled by the roll gap controller 33 according to the output of the roll gap correction amount calculator 32, the tension control system and the plate thickness control system are the same as in the case of the tenth or eleventh embodiment. It is possible to prevent the interference of the above and perform the tension control with high accuracy, and at the same time, keep the plate thickness of the rolled material constant.

Example 14. In addition, in Examples 10 to 13 described above, the rolled material 2 on the inlet side of the rolling stand 1 is used.
Although the case of controlling the tension of No. 1 is described, the same effect as that of the tenth embodiment is obtained also in the case of controlling the exit side tension of the rolling stand 1 as shown in FIG. 10, for example. Similarly, also in the case where the tension on the outlet side of the rolling stand 1 is controlled, the same effects as those of the above-mentioned Examples 11 to 13 are obtained.

Example 15. In the above embodiment, the tension control is performed by correcting the roll speed and the roll gap. However, as in the invention of claim 6 shown in FIG. 11, another tension controller for controlling the looper or the like 34 is described. Even when 35 is used, the same effect as that of the above-described embodiment can be obtained.

Example 16. FIG. 12 is a schematic configuration diagram showing an embodiment of the invention of claim 7, the same parts as those in FIG. In FIG. 12, reference numeral 36 is a rolling load fluctuation estimator that estimates the fluctuation of the rolling load from the tension detected by the tension detector 20.

Next, the operation of the sixteenth embodiment will be described. The calculation of the equation (1) is performed in the same manner as in each of the above-described embodiments, and the rolling load estimated value ΔF ′ caused by the tension fluctuation ΔT obtained from the tension detector 20 by the rolling load fluctuation estimator 36 is caused.
To estimate. Further, the load detector 3 always detects the rolling load acting on the rolled material 2 in the rolling stand 1, and when the rolling load fluctuates by ΔF, the roll gap correction amount calculator 14 calculates the formula (1). Instead of, the calculation of the equation (7) is performed, and the roll gap controller 9 corrects the roll gap between the rolling rolls 1a and 1a based on the obtained roll gap correction amount ΔSref, thereby increasing the fluctuation in tension. It is possible to maintain the plate thickness stably and with high accuracy without causing it to occur.

Also, in the above-mentioned embodiment, the same effect as that of the above-mentioned embodiment can be obtained when the calculation of the above-mentioned expression (5) ′ is performed using an appropriate tuning constant C ₁ instead of the expression (2). .

Example 17 Incidentally, in the above-mentioned Example 16,
Using the rolling load fluctuation estimated value ΔF ′ obtained by the rolling load fluctuation estimator 36 from the tension fluctuation, the elastic coefficient M ₀ of the rolling roll 1a, and the rolling load fluctuation ΔF, the above formula (7) is calculated to obtain the roll gap. The case where the correction amount ΔSref is obtained has been described. However, when the plastic coefficient of the rolled material is Q, the above formula (8) is calculated instead of the formula (7) to obtain the roll gap correction amount ΔSref. The same effects as in Example 16 are obtained.

Also, in the above-mentioned embodiment, when the appropriate tuning constants C ₂ , C ₃ and C ₄ are used in place of the expression (3), the calculation of the above-mentioned expression (9) is the same as in the above-mentioned embodiment. Produce an effect.

Example 18. Although only the fluctuations in tension on the inlet side of the rolling stand are described in Examples 16 and 17, as shown in FIG. 13, the fluctuations in tension on the outlet side are the same as those in Examples 16 and 17. With the same configuration, the plate thickness can be stably and accurately kept constant without increasing fluctuations in tension.

[0111]

As described above, according to the present invention, the roll gap correction amount calculated based on the plate thickness detected by the plate thickness detector and the rolling load fluctuation are calculated. Since the roll gap correction amounts do not interfere with each other, it is possible to obtain an automatic plate thickness control device capable of maintaining the plate thickness of the rolled material at a desired thickness with high accuracy.

According to the invention of claim 2, the roll gap calculated based on the front or rear tension correction amount calculated based on the plate thickness detected by the plate thickness detector and the rolling material load fluctuation. Since it is configured so that the correction amounts do not interfere with each other,
It is possible to obtain an automatic plate thickness control device capable of maintaining the plate thickness of a rolled material to a desired thickness with high accuracy.

According to the third aspect of the invention, the roll gap correction amount calculated based on the tension detected by the tension detector and the roll gap correction amount calculated based on the rolling load fluctuation interfere with each other. Since it is configured so that it does not exist, it is possible to obtain an automatic plate thickness control device capable of controlling the tension of the rolled material with high accuracy and at the same time maintaining the plate thickness of the rolled material constant.

According to the inventions of claims 4 to 6,
Roll speed correction amount or roll gap correction amount calculated based on the tension detected by the tension detector and roll gap correction amount ΔS calculated based on the rolling load fluctuation ΔF.
Since the ref does not interfere with each other, interference between the tension control system and the plate thickness control system can be prevented, the tension of the rolled material can be controlled with high accuracy, and at the same time, the plate thickness of the rolled material can be kept constant.

According to the invention of claim 7, the rolling load fluctuation ΔF ′ caused by the tension fluctuation detected by the tension detector is estimated, and the influence of ΔF ′ is removed from the rolling load fluctuation ΔF obtained by the rolling load detector. Since the roll gap correction amount ΔSref is calculated based on the above, the plate thickness can be stably kept constant with high accuracy without increasing the tension fluctuation when the tension fluctuation occurs.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing an embodiment of the invention of claim 1.

FIG. 2 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing an embodiment of the invention of claim 2;

FIG. 3 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing another embodiment of the invention of claim 2.

FIG. 4 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing still another embodiment of the invention according to claim 2;

FIG. 5 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing an embodiment of the invention of claim 3;

FIG. 6 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing another embodiment of the invention of claim 3;

FIG. 7 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a first embodiment of the invention of claim 4;

FIG. 8 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a first embodiment of the invention of claim 5;

FIG. 9 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a second embodiment of the invention of claim 5;

FIG. 10 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a ninth embodiment of the invention of claim 5;

FIG. 11 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing an embodiment of the invention of claim 6;

FIG. 12 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a first embodiment of the invention of claim 7;

FIG. 13 is a schematic configuration diagram of an automatic plate thickness control device for a rolling mill showing a second embodiment of the invention of claim 7;

FIG. 14 is a schematic configuration diagram showing an automatic strip thickness control device for a first conventional rolling mill.

FIG. 15 is an operation explanatory view of the automatic plate thickness control device of the rolling mill.

FIG. 16 is a schematic configuration diagram showing an automatic strip thickness control device for a second conventional rolling mill.

FIG. 17 is a schematic configuration diagram showing an automatic strip thickness control device for a third conventional rolling mill.

FIG. 18 is a schematic configuration diagram showing an automatic strip thickness control device for a fourth conventional rolling mill.

FIG. 19 is a schematic configuration diagram showing an automatic strip thickness control device for a fifth conventional rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling stand (rolling mill) 2 Rolled material 3 Load detector (rolling load detecting means) 5 Plate thickness detector (plate thickness detecting means) 6 Roll gap correction amount calculator 7 Rolling load fluctuation estimator 8 Roll gap correction amount calculation Roller 9 Roll gap controller 10 Rear tension correction amount calculator (Tension correction amount calculator) 11 Rear tension controller (Tension controller) 12 Rolling stand or roll 13 Rolling load fluctuation estimator 14 Roll gap correction amount calculator 16 Forward Tension correction amount calculator (tension correction amount calculator) 17 Forward tension controller (tension controller) 18 Rolling load fluctuation estimator 19 Rolling stand or roll 20 Tension detector (tension detecting means) 21 Roll gap correction amount calculator 22 Rolling load fluctuation estimator 23 Roll gap correction amount calculator 25 Tension detector (tension detection means) 26 Roll gap correction Calculator 27 Roll speed correction amount calculator 28 Speed controller 29 Rolling load fluctuation estimator 30 Speed controller 31 Rolling stand (rolling machine) 32 Roll gap correction amount calculator 33 Roll gap controller 35 Tension controller 36 Rolling load fluctuation Estimator

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[Procedure amendment]

[Submission date] February 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011] _{ΔS '= ΔS 1' = -} ΔF 1 / M 0

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

[0043]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the invention of claim 1, and in FIG. 1, 1 is a pair of upper and lower rolling rolls 1.
a, 1a is a rolling stand, 2 is a rolling roll 1a,
Rolled material whose plate thickness is controlled by passing between 1a, 3 is a load detector for detecting a rolling load applied to the rolled material 2 in the rolling stand 1, and 5 is an outlet side (or an inlet side) of the rolling stand 1. A plate thickness detector for detecting the plate thickness, 6 is a roll gap correction amount for calculating a roll gap correction amount ΔS ″ between the upper and lower rolling rolls 1a, 1a based on the detected plate thickness from the plate thickness detector 5 and the target plate thickness. An arithmetic unit, 7 is a rolling load fluctuation estimator that estimates the influence of the roll gap correction amount ΔS ″, which is the above calculation result, on the rolling load, and 8 is a detection signal from the load detector 3 and a predetermined rolling roll elastic coefficient and rolling. Estimated rolling load fluctuation value ΔF ”calculated by the load fluctuation estimator 7
Vertical work roll 1a on the basis of the bets, 'roll gap correction amount calculator for calculating a 4 roll gap correction amount [Delta] S' roll gap correction amount [Delta] S between 1a adder for adding the [Delta] S "and, 9 an adder 4 Is a roll gap controller that controls the roll gap between the rolling rolls 1a and 1a according to the addition result ΔSref.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

ΔS ′ = − ΔF / M ₀ (1)

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction content]

ΔS ′ = ΔS ₁ ′ = −ΔF ₁ / M ₀

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction content]

ΔS ′ = − (1 + Q / M ₀ ) {(ΔF−ΔF ″) / M ₀ + ΔS} / M ₀ + ΔS (4)

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

ΔS ′ = − (1 + Q / M ₀ ) · C ₂ · {C ₃ (ΔF−ΔF ″) / M ₀ + ΔS} + C ₄ · ΔS (6)

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction content]

ΔSref = − (1 + Q / M ₀ ) {(ΔF−ΔF ′) / M ₀ + ΔS} + ΔS (8)

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0081

[Correction method] Change

[Correction content]

ΔSref = − (1 + Q / M ₀ ) · C ₂ {C ₃ (ΔF−ΔF ′) / M ₀ + ΔS} + C ₄ ΔS (9)

Claims (7)

[Claims] 1. A plate thickness detecting means for detecting a plate thickness of a rolled material on an inlet side or an outlet side of a rolling mill and a first for calculating a roll gap correction amount from the plate thickness detected by the plate thickness detecting means. Roll gap correction amount calculator, rolling load detection means for detecting the rolling load applied to the rolled material, rolling load fluctuation estimator for estimating rolling load fluctuation from the calculated roll gap correction amount, the detected A second roll gap correction amount calculator for calculating a roll gap correction amount from the rolling load and the estimated rolling load fluctuation value, and based on the addition result of the roll gap correction amounts from the first and second calculators. And a roll gap controller for controlling the roll gap of the rolling mill. 2. A plate thickness detecting means for detecting a plate thickness of a rolled material on an inlet side or an outlet side of a rolling mill, and the rolling in front or behind the rolling mill based on the plate thickness detected by the plate thickness detecting means. A tension correction amount calculator for calculating a tension correction amount of a material, a rolling load detection means for detecting a rolling load applied to the rolled material, and a rolling load fluctuation estimator for estimating a rolling load fluctuation from the calculated tension correction amount. And a roll gap correction amount calculator for calculating the roll gap correction amount from the estimated rolling load fluctuation value for the detected rolling load, and a roll gap of the rolling mill based on the calculated roll gap correction amount. And a roll gap controller for controlling the roll gap and a tension controller for controlling the tension behind or in front of the rolling mill based on the tension correction amount. Place 3. A tension detecting means for detecting the tension of the rolled material at the inlet side or the outlet side of the rolling mill, and a first roll gap correcting amount for calculating a roll gap correcting amount from the tension detected by the tension detecting means. Calculator, rolling load detection means for detecting the rolling load applied to the rolled material, rolling load fluctuation estimator for estimating rolling load fluctuation from the calculated roll gap correction amount, the detected rolling load and the A second roll gap correction amount calculator for calculating a roll gap correction amount from the estimated rolling load fluctuation value, and the rolling mill based on the addition result of the roll gap correction amounts from the first and second calculators. Roll thickness controller for controlling the roll gap of the rolling mill. 4. A tension detecting means for detecting a tension of a rolled material at an inlet side or an outlet side of a rolling mill, and a roll speed correction amount calculator for calculating a roll speed correction amount from the tension detected by the tension detecting means. , A rolling load detecting means for detecting a rolling load applied to the rolled material, a rolling load fluctuation estimator for estimating a rolling load fluctuation from the calculated roll speed correction amount, the detected rolling load and the estimated A roll gap correction amount calculator for calculating the roll gap correction amount from the rolling load fluctuation value, a roll gap controller for controlling the roll gap of the rolling mill based on the calculated roll gap correction amount, and the roll speed correction An automatic plate thickness control device for a rolling mill, comprising: a speed controller that controls a roll speed of a preceding stage or a succeeding stage of the rolling mill based on a quantity. 5. A tension detecting means for detecting the tension of the rolled material on the inlet side or the outlet side of the rolling mill, and a roll speed correction amount calculator for calculating the roll speed correction amount from the tension detected by the tension detecting means. , A rolling load detecting means for detecting a rolling load applied to the rolled material, a roll gap correction amount calculator for calculating a roll gap correction amount from the detected rolling load, and based on the calculated roll gap correction amount An automatic strip thickness control device for a rolling mill, comprising: a roll gap controller that controls a roll gap of the rolling mill; and a speed controller that controls a roll speed of the rolling mill based on the roll speed correction amount. 6. A tension detecting means for detecting the tension of the rolled material on the inlet side or the outlet side of the rolling mill, a tension correction amount calculator for calculating a tension correction amount from the tension detected by the tension detecting means, and Rolling load detecting means for detecting a rolling load applied to a rolled material, a rolling load fluctuation estimator for estimating rolling load fluctuation from the calculated tension correction amount, the detected rolling load and the estimated rolling load fluctuation A roll gap correction amount calculator for calculating the roll gap correction amount from the value, a roll gap controller for controlling the roll gap of the rolling mill based on the calculated roll gap correction amount, and based on the tension correction amount An automatic strip thickness control device for a rolling mill, comprising: a tension controller for controlling the tension of the rolled material. 7. A tension detecting means for detecting a tension of a rolled material at an inlet side or an outlet side of a rolling mill, a rolling load variation estimator for estimating a rolling load variation from a tension detected by the tension detecting means, and Rolling load detection means for detecting a rolling load applied to a rolled material, a roll gap correction amount calculator for calculating a roll gap correction amount from the detected rolling load and the estimated rolling load fluctuation value, and this calculated An automatic strip thickness control device for a rolling mill, comprising: a roll gap controller that controls a roll gap of the rolling mill based on a roll gap correction amount.