JPH0217246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate thickness and width feedforward control device for a rolled strip material, and is particularly applicable to a device for controlling strip thickness and width feed forward of a strip-shaped rolled material, particularly when rolling a strip-shaped steel plate such as a cold-rolled thin steel plate using a tandem mill, a reverse mill, etc. The present invention relates to a plate thickness and plate width feedforward control device for strip-shaped rolled material, which is suitable for use in the following.

Generally, when rolling steel strips using tandem mills, reverse mills, etc., it is essential to control the thickness of the strip.
Many studies have been conducted to date. That is, for example, as shown in FIG. 1, in a tandem mill having the i-th stand 10 and the i+1-th stand 12 on the downstream side, a tension meter 14 is installed to detect the tension between the i-th stand 10 and the i+1-th stand 12.
and a tension signal converter 15, a thickness gauge 16 for detecting the exit side plate thickness deviation Δh of the i-th stand 10, a plate thickness deviation signal converter 17, and a tension measurement value T _A of the output of the tension signal converter 15. A subtracter 18 calculates the difference between the tension target value and the tension deviation ΔT A outputted from the subtracter 18, and converts the tension deviation ΔT _A of the i-th stand 10 into the roll rotational speed control amount Δv of the i-th stand 10.
a tension roll rotational speed converter 20 that outputs an output to a roll rotational speed control device (ASR) 24 for controlling the rotational speed of a main motor 22 that rotationally drives the work roll; and the plate thickness deviation signal converter 17.
Plate thickness deviation Δh of the output side of the i-th stand 10
a plate thickness-rolling position converter that converts the amount into a rolling position control amount ΔS of the i+1st stand 12 on the downstream side and outputs it to the rolling control device (APR) 28 that controls the rolling position of the work roll of the i+1st stand 12. 2
6, the main motor 22 controls the tension between the i-th stand 10 and the downstream i+1-th stand 12 to a constant value, and the i-th stand 10 exit side The thickness deviation Δh of downstream side i+1st stand 12
By applying the feed forward under the pressure of
A method of predictively controlling the outlet side plate thickness of the i+1st stand 12 on the downstream side, or as shown in FIG.
Tension meter 14 and tension signal converter 1 similar to Fig. 1
5, a thickness gauge 16 and a plate thickness deviation signal converter 17;
The plate thickness deviation Δh of the output side of the i-th stand 10 of the plate thickness deviation signal converter 17 is converted into the roll rotation speed control amount Δv of the i-th stand 10 to control the roll rotation speed of the i-th stand 10. Device 2
plate thickness-roll rotation speed converter 30 outputting to 4;
A subtractor 18 that calculates the difference between the tension measurement value TA output from the tension signal converter ₁₅ and the tension target value, converting the tension deviation ΔT _A output from the subtractor 18 into the lowering position control amount ΔS of the i+1st stand 12 on the downstream side. Then, the i-th
An arithmetic device 29 consisting of a tension-down position converter 32 that outputs to the down control device 28 of the +1 stand 12
The plate thickness deviation Δh on the outlet side of the i-th stand 10 is directly fed back to the roll rotation speed of the i-th stand to change the tension between the i-th stand 10 and the i+1 downstream stand 12, and The thickness of the exit side plate of the i+1st stand 12 on the downstream side is controlled predictively, and the tension fluctuation caused by this is controlled on the i+1st stand 12 on the downstream side.
A method of correction under the pressure of one stand 12 has been proposed. Furthermore, many thickness control methods, such as the Visla method and the feedback method (monitor method), have been proposed and have been applied to actual machines.

In all of these conventional sheet thickness control methods, the prerequisite is that the sheet width remains constant, but in actual rolling, during high-tension rolling using tandem mills, etc., the sheet width 2 for 1000mm
It has been experienced that the width of the sheet shrinks by about ~3 mm, while during low-tension rolling such as in a skin pass mill, the width of the sheet increases by about 2 to 3 mm when the width of the sheet is 1000 mm. Therefore, it has been difficult to control the plate thickness with high accuracy using only the conventional plate thickness control method that ignores plate width variations.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and has a simple structure that allows highly accurate control of plate thickness and plate width in consideration of variation in plate width. An object of the present invention is to provide a sheet width feed forward control device.

The present invention provides a plate thickness and plate width feed forward control device for a strip-shaped rolled material, a plate thickness deviation detection means for determining the plate thickness deviation Δh _i on the exit side of the i-th stand, and a plate width feed forward control device on the exit side of the i-th stand. plate width deviation detection means for determining the deviation Δw _i ; traveling speed detection means for determining the traveling speed v _i of the strip-shaped rolled material; tension detection means for detecting the tension between the i-th stand to the i+1-th stand; and the said traveling speed detection means. According to the running speed v _i of the strip-shaped rolled material output by the means, the plate thickness deviation Δh _i and plate width deviation Δw _i on the exit side of the i-th stand, which are output from the plate thickness deviation detection means and the plate width deviation detection means, are calculated on the downstream side. a tracking means for tracking to just below the roll of the i+1st stand to obtain the board thickness deviation ΔH _i+1 and the board width deviation ΔW _i+1 on the entrance side of the i+1st stand; Convert the plate thickness deviation ΔH _i+1 and plate width deviation ΔW _i+1 at the entrance side of the i+1 stand to the plate thickness deviation Δh _i+1 and plate width deviation Δw _i+1 at the exit side of the i+1 stand, and then an arithmetic unit that calculates a rolling load correction amount Δ _i+1 and a rear tension correction amount Δ i+1 of the i+1st stand from the plate thickness deviation Δh _{i+ 1} and plate width deviation Δw _{i+1 on the exit side of the i+1} stand; A rolling load-rolling position converter that converts the rolling load correction amount Δ _i+1 output from the calculator into a rolling position control amount ΔS _i+1 and outputs it to the rolling control system of the i+1st stand; an adder/subtractor for calculating the rear tension control amount ΔTb _{Ai+1 of} the i+1th stand from the rear tension correction amount Δ i+1 , the tension target value _i+1 of the tension constant control system, and the tension measurement value Tb _Ai+1 by the tension detection means; The rear tension control amount ΔTb _Ai+1 output from the adder/subtractor is converted into the roll rotation speed control amount Δv _i of the i-th stand, and the rear tension − is output to the roll rotation speed control system of the i-th stand.
The above object has been achieved by using a roll rotation speed converter.

The principle of the present invention will be explained below. In general, the i+
The outlet side plate width w _i+1 and the outlet side plate thickness h _i+1 of one stand,
Similarly, the relationship shown in the following equation holds between the rolling load P _i+1 of the i+1-th stand and the rear tension (tension between the i-th stand on the upstream side and the _i+1-th stand) Tb i+1.

w _i+1 = w (P _i+1 , Tb _i+1 ) ...(1) h _i+1 = h (P _i+1 , Tb _i+1 ) ...(2) Furthermore, this (1) In equation (2), the influence of the forward tension of the i+1-th stand is ignored because it is usually small.

When the relationships shown in equations (1) and (2) above are established, and the rolling load P and rear tension Tb change, the amount of variation in the width of the exit plate of the i+1st stand Δw _i+1
And the variation amount of plate thickness on the exit side Δh _i+1 is as shown in the following equation.

Δw _i+1 = ∂w/∂P・ΔP _i+1 ＋∂w/∂Tb・ΔTb _i+1 ...(3) Δh _i+1 = ∂h/∂P・ΔP _i+1 +∂h/ ∂Tb・ΔTb _i+1 ...(4) Therefore, if the plate thickness deviation Δh i ₊₁ and plate width deviation Δw _i+1 occur on the exit side of the i+1 stand during rolling,
If equations (3) and (4) are solved simultaneously and the rolling load and rear tension are controlled to eliminate the obtained rolling load fluctuation amount ΔP _i+1 and rear tension fluctuation amount ΔTb _i+1. ,
The outlet side plate thickness variation Δh _i+1 and the outlet side plate width variation Δw _i+1 of the i+1th stand are corrected, and the target plate thickness and plate width are obtained. The following equation is the solution of equations (3) and (4) above, that is, the rolling load correction amount Δ of the i+1th stand.
P _i+1 and rear tension correction amount Δ _i+1 are shown.

_i+1 = ∂h／∂Tb・Δw _i+1 −∂w／∂Tb・Δh _i+1 /
∂w／∂ _P・∂h／∂Tb−∂w／∂Tb・∂h／∂ _P ...(5) _i+1 = ∂h／∂ _P・Δw _i+1 −∂w／∂Tb・Δh _i+1 /
∂w／∂ _P・∂h／∂Tb−∂w／∂Tb・∂h／∂ _P ...(6) Therefore, in order to perform feedforward control, first the output of the i-th stand on the upstream side is The side plate thickness deviation Δh _i and the exit side plate width deviation Δw _i are determined by detection or calculation. This is tracked up to the entrance side of the i+1st stand on the downstream side according to the plate speed v _i , and is set as the entrance side plate thickness deviation ΔH _i+1 and the entrance side plate width deviation ΔW _i+1 of the i+1th stand, respectively. That is, by the following equation,
The outlet plate thickness deviation Δh _i and the outlet plate thickness deviation Δw _i of the i-th stand are Lh/v _i (here, Lh is the distance between the thickness gauge and the i+1st stand) and Lw/v _i (here, Lw is the distance between the width gauge and the i+1th stand), thereby determining the entry side plate thickness deviation ΔH _i+1 and the entry side plate width deviation ΔW _{i+1 of the i+1th} stand.

ΔH _i+1 (t)=Δh _i (t+Lh/v _i )...(7) ΔW _i+1 (t)=Δw _i (t+Lw/v _i )...(8) Here, t is time. be.

In this way, the exit side plate thickness deviation and exit side plate width deviation of the i-th stand tracked up to the entrance side of the i-th stand on the downstream side are determined by the following equation.
+1 This is converted into an exit side plate thickness deviation Δh _i+1 and an exit side plate width deviation Δw _i+1 of the stand.

Δh _i+1 = ∂h/∂H・ΔH _i+1 ……(9) Δw _i+1 = ∂w/∂W・ΔW _i+1 ……(10) Therefore, this (9), (10 ) The exit side plate thickness deviation Δh _i+1 and the exit side plate width deviation Δw _i+1 obtained from equation (5) above,
Rolling load correction amount ΔP _i+1 used in formula (6)
By controlling with the rear tension correction amount ΔTb _i+1 , it is possible to simultaneously control the plate thickness and plate width in a feedforward manner.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the thickness and width feedforward control device for strip-shaped rolled material according to the present invention will be described in detail below.

In this embodiment, as shown in FIG. 3, in order to detect the plate thickness deviation Δh _i on the exit side of the i-th stand 10,
A plate thickness deviation detection means consisting of a thickness gauge 16 and a plate thickness deviation signal converter 17 similar to the conventional one, and a width gauge 40 and plate for detecting the plate width deviation Δw _i on the exit side of the i-th stand 10. A strip width deviation detection means consisting of a width deviation signal converter 41, and a pilot generator 42 disposed on the measuring roll in contact with the rolled material 8 for detecting the plate speed v _i of the rolled material 8.
and a speed signal converter 43; a tension detecting means similar to the conventional one consisting of a tension gauge 14 and a tension signal converter 15; and the thickness gauge 16.
and the distance Lh between the i+1st stand 12 on the downstream side and the distance Lw between the width total 40 and the i+1st stand 12
a setting device 46 for setting the speed signal converter 4;
a delay circuit that delays the outlet side plate thickness deviation Δh _i of the i-th stand output from the plate thickness deviation signal converter 17 by a time Lh/v _i according to the plate speed v _i of the third output and the distance Lh of the setting device 46 output; 48, also the speed signal converter 4
The plate speed v _i of the 3 outputs and the distance of the setting device 46 output
A delay circuit 50 that delays the exit side board width deviation Δw _i of the i-th stand, which is the output of the board width deviation signal converter 41, by a time Lw/v _i in accordance with Lw _; Delayed i-th stand outlet plate thickness deviation Δh _i , i.e., i+1-th stand inlet plate thickness deviation ΔH _i+1 , i-th stand outlet plate width deviation Δw delayed by time Lw/v _i of the output of the delay circuit 50 _i , that is, the rolling load correction amount ΔP calculated by calculating the above equations (5), (6), (9), and (10) according to the i+1 stand entry side plate width deviation ΔW _i+ 1 A computing unit 52 that outputs _i+1 and rear tension correction amount ΔTb _i+1 converts the rolling load correction amount ΔP _i+1 output from the computing unit 52 into the rolling position control amount ΔS _i+1 of the i+1st stand. , downstream i-th
+1 Stand 12 pressure reduction control device (APR) 28
The rolling load-rolling position converter 54 outputs the rear tension correction amount ΔTb _i+1 output from the arithmetic unit 52, the tension target value Tb _i+1 of the constant tension control system, and the tension measurement output from the tension signal converter 15. i+1th from value Tb _Ai+1
An adder/subtractor 56 that calculates the rear tension control amount ΔTb _Ai+1 of the stand, converts the rear tension control amount ΔTb _Ai+1 output from the adder/subtractor 56 into the roll rotation speed control amount Δv _i of the i-th stand 10 on the upstream side. Then, the roll rotation speed control device (ASR) 2 of the i-th stand 10
Back tension-roll rotation speed converter 5 output to 4
8 arithmetic unit 44.

The arithmetic unit 52, as shown in detail in FIG.
Each influence coefficient ∂w/∂W, ∂h/∂H, ∂h/∂P, ∂w/∂P,
∂h/∂Tb, ∂w/∂Tb are set by the setting device 60, and the influence coefficient ∂h/of the setting device 60 output is applied to the input side plate thickness deviation ΔH _i+1 of the i+1th stand of the output of the delay circuit 48. A multiplier 62 is used to multiply ∂H to obtain the exit side plate thickness deviation Δh i+ ₁ of the i+1st stand, and the input side plate width deviation ΔW i+ ₁ of the i+1st stand of the output of the delay circuit 50 is multiplied by the output of the setter 60. A multiplier 64 for multiplying the influence coefficient ∂w/∂W to obtain the exit side plate width deviation Δw i+ ₁ of the i+1st stand, and the output side plate thickness deviation Δh _i of the i+1th stand output from the multiplier 62. ₊₁ and the influence coefficient ∂w/∂Td of the output of the setting device 60; a multiplier 66 for multiplying the output side plate width deviation Δw _i+1 of the i+1th stand of the output of the multiplier 64 and the output of the setting device 60; a multiplier 68 for multiplying the influence coefficient ∂h/∂Tb of the multiplier 62, and the influence coefficient ∂w/∂P of the output side plate thickness deviation Δh i+1 of the i ₊ 1th stand of the multiplier 62 and the output of the setting device 60; and a multiplier 72 for multiplying the output side board width deviation Δw i+ ₁ of the i+1st stand of the output of the multiplier 64 by the influence coefficient ∂h/∂P of the output of the setting device 60. and a subtracter 74 for subtracting the output of the multiplier 66 from the output of the multiplier 68;
a subtracter 76 for subtracting the output of the multiplier 70 from the output of the multiplier 72; and the setting device 60.
Output influence coefficients ∂w/∂Tb, ∂h/∂P, ∂w/∂P, ∂h/
An arithmetic unit 78 for calculating the denominators of equations (5) and (6) above from ∂Tb, ∂w/∂P ∂h/∂Tb−∂w/∂Tb ∂h/∂P, and the subtractor 74. A divider 80 divides the output of the calculator 78 by the output of the calculator 78 to calculate the rolling load correction amount _i+1 , and a divider 80 divides the output of the subtracter 76 by the output of the calculator 78 to calculate the rear tension. and a divider 82 for calculating the correction amount _i+1 .

The action will be explained below. A rolled material 8 such as a steel plate is sequentially rolled at the i-th stand 10 and the i+1-th stand 12. The outlet side plate thickness deviation Δh _i of the i-th stand 10 detected by the thickness gauge 16 and the plate thickness deviation signal converter 17 is input to the delay circuit 48 of the arithmetic unit 44 . This delay circuit 48 converts the output of the pilot generator 42 into a speed signal converter 43.
Using the plate speed v _i found in and the distance Lh between the thickness gauge 16 and the i+1 downstream stand 12 set by the setting device 46, the exit side plate thickness of the i-th stand is determined by Lh/v _i time. The deviation Δh _i is delayed, and the input side plate thickness deviation ΔH i+ ₁ of the i+1 downstream stand 12 is calculated by the computing unit 5.
Enter 2. Similarly, the i-th stand 10 detected by the width gauge 40 and the plate width deviation signal converter 41
The output side plate width deviation Δw _i is input to the delay circuit 50. In this delay circuit 50, the plate speed v _i determined by the speed signal converter 43 according to the output of the pilot generator 42 and the distance between the width meter 40 and the i+1st stand 12 on the downstream side set by the setting device 46 are determined.
Using Lw, the exit plate width deviation Δw _i of the i-th stand is delayed by Lw/v _i time and inputted to the calculator 52 as the inlet plate width deviation ΔW _i+1 of the (i+1)th stand 12 on the downstream side. In the arithmetic unit 52, first, the multiplier 62,
64, the i-th output of the delay circuit 48 and 50 is
By multiplying the entry side plate thickness deviation ΔH _i+1 and the entry side plate width deviation ΔW _i+1 of the +1 stand by the influence coefficients ∂h/∂H and ∂w/∂W, respectively, the above (9) and (10) ),
Obtain the outlet side plate thickness deviation Δh _i+1 and the outlet side plate width deviation Δw _i+1 of the i+1th stand. Next, each obtained output side deviation and each influence coefficient set by the setting device 60 are multiplied by multipliers 66, 68, 70, 72, and the results are further subtracted by subtracters 74, 76, and Arithmetic unit 7
8 calculates the denominators of equations (5) and (6), and divides them into dividers 80 and 8.
In step 2, equations (5) and (6) are calculated to calculate the rolling load correction amount _i+1 and rear tension correction amount _i+1 of the i+1 downstream stand 12.

The rolling load correction amount ΔP _i+1 obtained by the calculator 52 is further calculated by the rolling load-rolling position converter 54.
is multiplied by the influence coefficient ∂S/∂P, and the i- _th
It is output to the reduction control device 28 of the +1 stand 12, and a predetermined load change is performed in a feedforward manner. On the other hand, the rear tension correction amount _i+1 calculated by the calculator 52 is input to the adder/subtracter 56,
Here, the following calculation is performed.

ΔTb _Ai+1 = _i+1 + _i+1 −Tb _Ai+1 ...(11) Here, ΔTb _Ai+1 is the rear tension control amount of the i+1st stand, and _i+1 is the tension target of the constant tension control device. The value, Tb _Ai+1 , is the tension meter 14 and tension signal converter 15.
This is the tension measurement value detected at . Backward tension control amount ΔTb _Ai+1 of the i+1st stand of the adder/subtractor 56 output
is multiplied by the influence coefficient ∂v _i /∂Tb _i+1 by the rear tension-roll rotational speed converter 58, and converted into the roll rotational speed change amount Δv _i of the i-th stand 10 on the upstream side. The tension is outputted to the roll rotation speed control device 24 of the stand 10, and a predetermined tension change is performed in a feedforward manner.

In the above embodiment, the thickness deviation Δh _i and the exit side plate width deviation Δw _i of the i-th stand of the rolled material 8 were actually measured using the thickness gage 16, the width gage 40, etc. The method of detecting the plate thickness deviation and plate width deviation on the exit side of the i-th stand is not limited to these,
For example, it is also possible to use a value calculated from rolling information.

Further, in the above embodiment, the plate speed of the rolled material is determined from the output of the pilot generator 42 disposed on the measuring roll, but the method for detecting the plate speed of the rolled material is not limited to this. ,
Naturally, the present invention also includes a method of detecting with a non-contact speed meter or a method of calculating the plate speed from the work roll circumferential speed and advance rate of the i-th stand on the upstream side.

Further, in the above embodiment, a constant tension control system was used and the tension was changed through the constant tension control system, but the method of changing the tension is not limited to this, and for example, the constant tension control system may be used. If not, it is also possible to directly modify the rolling speed using equation (11) above.

In the above embodiments, the present invention was applied to a tandem mill, but the scope of application of the present invention is not limited thereto, and is equally applicable to a reverse mill.

Further, the type of rolled material is not limited to steel plates, and the present invention is similarly applicable to other rolled strip materials such as paper, tape, and film.

As explained above, according to the present invention, when rolling a strip-shaped material, it is possible to simultaneously control the thickness and width of the strip with high accuracy with a simple configuration, and It has the excellent effect of being able to perform good rolling in both width and width.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the area around the i-th stand of a tandem mill in which an example of a conventional plate thickness control method is adopted, and Fig. 2 is a block diagram of a tandem mill in which another conventional plate thickness control method is adopted. FIG. 3 is a block diagram showing the area around the i-th stand of a tandem mill in which an embodiment of the plate thickness feed forward control device for strip-shaped rolled material according to the present invention is installed. Block Diagram FIG. 4 is a block diagram showing the configuration of the arithmetic unit in the embodiment. 8...Rolled material, 10...I-th stand, 12...
...i-th +1st stand, 14... tension meter, 15...
Tension signal converter, 16... Thickness gauge, 17... Plate thickness deviation signal converter, 22... Main motor, 24...
... Roll rotation speed control device, 28 ... Rolling down control device, 40 ... Width meter, 41 ... Board width deviation signal converter, 42 ... Pilot generator, 43 ...
Speed signal converter, 44... Arithmetic device, 46... Setting device, 48, 50... Delay circuit, 52... Arithmetic unit, 54... Rolling load-rolling position converter, 56...
...adder/subtractor, 58...rear tension-roll rotation speed converter.

Claims (1)

[Scope of Claims] 1. Plate thickness deviation detection means for determining the plate thickness deviation Δh _i on the exit side of the i-th stand; Plate width deviation detection means for similarly obtaining the plate width deviation Δw _i on the exit side of the i-th stand; a traveling speed detecting means for determining the traveling speed v _i of the rolled material; a tension detecting means detecting the tension between the i-th stand and the i+ ₁ -th stand; Then, the plate thickness deviation Δh _i and the plate width deviation Δw _i on the exit side of the i-th stand, which are output from the plate thickness deviation detection means and the plate width deviation detection means, are tracked to just below the roll of the i+1-th stand on the downstream side. i+1
a tracking means for obtaining the board thickness deviation ΔH _i+1 and the board width deviation ΔW _i+1 on the entrance side of the stand;
The plate thickness deviation ΔH _i+1 on the entrance side of the +1 stand and the plate width deviation ΔW _i+1 are expressed as the plate thickness deviation Δh i+ ₁ on the exit side of the i+1 stand.
and plate width deviation Δw _i+1 , and further, this i-th +
Rolling load correction amount Δ of the i+1st stand from the plate thickness deviation Δh _i+1 and plate width deviation Δw i+ ₁ on the exit side of the 1st stand
A computing unit that calculates P _i+1 and rear tension correction amount Δ _i+1 , and converting the rolling load correction amount Δ _i+1 output from the computing unit into a rolling position control amount ΔS _i+1 , a rolling load-rolling position converter that outputs to the rolling control system; a backward tension correction amount Δ _i+1 of the output of the arithmetic unit; a tension target value _i+1 of the constant tension control system; and a tension measurement value by the tension detecting means. An adder/subtractor that calculates the rear tension control amount ΔTb _Ai+1 of the i-th stand from Tb _Ai +1, and converting the rear tension control amount ΔTb _Ai+1 output from the adder/subtractor into the roll rotation speed control amount Δv _i of the i-th stand. and a rear tension-roll rotation speed converter that outputs the output to the roll rotation speed control system of the i-th stand.