JP3115081B2 - Control method and apparatus for continuous rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous rolling mill for obtaining a product of different steel types, sheet thicknesses, sheet widths and material temperatures without stopping the rolling mill during rolling. The present invention relates to a control method and device.

[0002]

2. Description of the Related Art As a continuous rolling mill for metal or the like, there is a continuous finishing rolling mill of a hot strip mill, for example. This continuous finishing rolling mill is usually composed of three to eight stand rolling mills, and a bar (sending side plate of a rolling mill) sent from a rough rolling mill side is set with a plurality of stands to set a sheet thickness and output a final stand. Rolling is performed so that the side material temperature becomes the set temperature.

[0003] Conventionally, in such a continuous finishing mill, a so-called running distance change has been carried out so as to obtain a product having a sheet thickness, a sheet width and a material temperature with different steel types without stopping the mill during rolling. I have. Here, the change in the running distance means that the set value (roll gap, roll peripheral speed, etc.) of the preceding rolling mill A during rolling is automatically changed to the setting value of the finishing mill in the rolling of the subsequent strip B. It means to shift.

Therefore, in order to make such a change in running distance, the correlation between the roll speed control, the roll gap control, the roll bending control, and the looper control between the stands for each stand of the continuous finishing mill is required. It is necessary to consider the control system.

[0005]

However, there are many conventional methods and apparatuses for controlling a continuous finishing mill that individually control each stand. There is no device for changing the running distance, and there is a problem in the stability and control accuracy of the control system. In addition, in order to make a control system that actually considers the correlation of each control, not only the problem of how to handle the deformation resistance of the material and how to feedback the tension, but also the problem that the control system becomes complicated There is also.

SUMMARY OF THE INVENTION The present invention solves such a problem and adopts a control system in which the correlation between the controls is taken into consideration, thereby enabling a simple configuration to achieve a stable and high-precision rolling control when changing the running distance. It is an object of the present invention to provide a machine control method and apparatus.

[0007]

In order to achieve the above-mentioned object, the present invention has a plurality of rolling mills (stands), and a preceding material and a succeeding material having different steel types, sheet thicknesses, sheet widths, and material temperatures. In the continuous rolling mill for continuous rolling by connecting at the entrance side of the first stand, when the tracking function detects the connection point of the preceding material and the succeeding material and detects that the connection point of both materials reaches each stand. In addition to changing the roll gap and roll bending force of each stand from the set value of the preceding material to the set value of the succeeding material in a ramp shape and controlling each of them, measurement is performed before the connection point of the two materials enters the continuous rolling mill. Inlet thickness of each stand obtained from the system,
The exit side plate thickness, the entrance side tension, the exit side tension, the roll peripheral speed and the deformation resistance obtained by calculation, the advance rate are stored, and the stored value of each stand is determined by the timing at which the connection point of the two materials enters the continuous rolling mill. And an arithmetic expression by mass flow control using the current value corresponding to the stored value

[0008] ΔV _Ri / V _Ri ^L = (ΔV _{Ri + 1} / V _{Ri + 1} ^L ) + (Δh _{i + 1} / h _{i + 1} ^L ) + (Δf _{i + 1} / f _{i + 1} ^L ) − (ΔH _{i + 1} / H _{i + 1} ^L _{) - (Δf i / 1 +} f i L )

(However, i is a stand number, V _R ^L Stored value of the roll peripheral speed, [Delta] V _R is the difference between the current value of the roll peripheral speed and the stored value, h ^L Is the stored value of the outlet plate thickness, Δh is the difference between the current value and the stored value of the outlet plate thickness, f ^L Is the stored value of the advance rate, Δf
Is the difference between the current value of the advanced rate and the stored value, H ^L Is the stored value of the entrance side plate thickness, ΔH is the difference between the current value of the entrance side plate thickness and the stored value), and the roll peripheral speed command value of each stand is corrected by the roll peripheral speed obtained from the roll peripheral speed to control the speed of each stand. It was done.

A continuous rolling mill having a plurality of rolling mills (stands) for connecting a preceding material and a succeeding material having different steel types, sheet thicknesses, sheet widths, and material temperatures at the entrance of the first stand to perform continuous rolling. In the machine, each of the stands is provided corresponding to each stand, when the tracking function detects the arrival of the connection point of both materials to each stand by tracking the connection point of the preceding material and the succeeding material, the roll gap of each stand is determined. Roll gap control means for changing the setting value of the preceding material to the setting value of the succeeding material in a ramp shape and controlling each of them, and provided respectively for each stand, and a connection point of the two materials to each stand by the tracking function. , The roll bending force of each stand is ramped from the setting of the preceding material to the setting of the succeeding material. Roll bending control means for controlling each stand, and each stand is provided corresponding to each stand, and the entrance side plate thickness, the exit side plate thickness, the entrance side tension, the exit side tension of each stand obtained from the measurement system before entering the continuous rolling mill. The roll resistance and the deformation resistance obtained by calculation, the advance rate are stored, and the stored value of each stand and the current value corresponding to this stored value are determined by the timing at which the connection point of the two materials enters the continuous rolling mill. Calculation formula by mass flow control used

[0011] ΔV _Ri / V _Ri ^L = (ΔV _{Ri + 1} / V _{Ri + 1} ^L ) + (Δh _{i + 1} / h _{i + 1} ^L ) + (Δf _{i + 1} / f _{i + 1} ^L ) − (ΔH _{i + 1} / H _{i + 1} ^L _{) - (Δf i / 1 +} f i L )

(Where i is the stand number, V _R ^L Stored value of the roll peripheral speed, [Delta] V _R is the difference between the current value of the roll peripheral speed and the stored value, h ^L Is the stored value of the outlet plate thickness, Δh is the difference between the current value and the stored value of the outlet plate thickness, f ^L Is the stored value of the advance rate, Δf
Is the difference between the current value of the advanced rate and the stored value, H ^L Is the stored value of the incoming plate thickness, ΔH is the difference between the current value and the stored value of the incoming plate thickness)

[0013] A mass flow control means for correcting the roll peripheral speed command value of each stand with the roll peripheral speed correction value obtained from the mass flow control means to change the roll peripheral speed, and based on the roll peripheral speed command value corrected by the mass flow control means. Speed control means for controlling the speed of each stand.

[0014]

In the control method and apparatus for a continuous rolling mill having such a configuration, the roll gap and roll bending of each stand are changed from the set value of the preceding material to the set value of the succeeding material in a ramp shape when the running distance is changed. Each stand is controlled by a control system in which the roll peripheral speed of each stand is changed by mass flow control, so that the rolling control can be performed stably and with high accuracy.
Also, when performing mass flow control, the deformation of the material is taken into consideration, and a tension component that is a feedback factor due to the tension is eliminated or removed from Δh _{i + 1} , Δf _{i + 1} , and Δf _i in the above equation, and the roll circumference is removed. By determining the speed, the problem caused by the feedback of the deformation resistance and the tension can be solved without making the control system complicated.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a system configuration for explaining a control method and apparatus of a hot strip mill finishing mill as a continuous mill according to the present invention. In FIG. 1, reference numerals 1, 101, 201 denote roll drive motors 2, 1
02, 202 at each stand rolling mill
Here, (i-1) stand, i stand, (i + 1)
The case of a finishing mill of a stand is shown. 3,103,20
3 is a rolling load measuring device that detects the rolling load of each stand,
Reference numerals 4, 104, and 204 denote setting calculation units 300, which will be described in detail later.
Roll gap command value S _i-1 ^REF , S _i
^REF , S _{i + 1} ^REF Is a roll gap control device that controls the roll gap of each stand based on the above.

Reference numerals 5, 105 and 205 denote roll bending control devices for controlling the roll bending force of each stand.
Reference numerals 5 and 205 _denote roll bending command values F _i-1 ^REF output from the setting calculation unit 300. , F _i ^REF , F _{i + 1} ^REF Alternatively, a change ΔF in roll bending determined by an automatic bending device (not shown) based on the rolling load detected by the rolling load meters 4, 104, 204 when the running distance is changed.
Any of _i−1 , F _i , and F _{i + 1} is determined by switchers 6, 106, 2
06.

Further, reference numerals 6, 106 and 206 denote mass flow controllers for changing the roll peripheral speed by mass flow control when changing between runs.
Reference numeral 206 stores the information on the outlet side plate thickness, the sheet width, and the outlet side material temperature of each stand sequentially delayed by a well-known delay function (not shown), and the connection point between the material A and the material B enters the first stand. It has a storage unit that stores the roll peripheral speed measurement signal, the entrance and exit tension measurement signals, the roll gap measurement signal and the rolling load measurement signal of each stand taken in immediately before, and the deformation resistance and advance rate obtained by calculation. And a calculation unit that executes a predetermined calculation (details will be described later) based on each storage information of the storage unit to change the roll peripheral speed of each stand.

Reference numerals 7, 107, 207 denote speed control devices for controlling the roll drive motors 2, 102, 202 of the respective stands. The speed control devices 2, 102, 202 provide a roll peripheral speed command V _Ri-1 ^REF. , V _Ri ^REF , V _{Ri + 1} ^REF And the roll peripheral speed change output from the mass flow controllers 6, 106, 206 when the running distance is changed are added to the adders 8, 108, 20.
8 is added and input.

On the other hand, 9.109 is a looper roll disposed between the stands. The looper rolls 9 and 109 are driven by looper motors 10 and 110, and the looper angle θ is changed via looper rotating shafts 11 and 111. It has become.

Numerals 12 and 112 are tension measuring devices for measuring the tension of the material 13 to be rolled, and 13 and 113 are looper motors 1.
0, 110 is a speed control device (or a current control device).

Further, reference numerals 14 and 114 indicate a tension command value T._i-1
^REF And looper angle command value θ_i-1 ^REF , Tension command value T_i ^REF
And looper angle command value θ_i ^REF Is entered and Zhang
The tension measurement values measured by the force measuring devices 12 and 112 and
Non-interference control device to which the looper angle detection value is input
The looper non-interference control devices 14 and 114 provide a tension command.
Value T_i-1 ^REF , T_i ^REF Will be added to each tension measurement.
Looper angle command value θ_i-1 ^REF , Θ_i ^REF Are each
The speed control device (or
Current control device) 12, 112, and
Roll peripheral speed output as a correction value to adders 15 and 11
5,215, the roll peripheral speed control of each stand described above
Adders to the outputs of the adders 8, 108, 208 of the control system
It is.

Here, the setting calculation section 300 for outputting a command value to each control system includes a roll gap setting value, a roll bending setting value, a roll peripheral speed setting value, and a looper setting value for the materials A and B at each stand. The angle setting value is obtained in advance by calculation, and when it is determined that the connection point has reached each stand by the input of a tracking detection signal for tracking the connection point between the material A and the material B, each command value of the corresponding stand is changed to the current value. Has the function of changing the set value of the material B to the set value of the material B. Next, the operation of the control device of the hot strip mill finishing mill configured as described above will be described.

Now, for example, steel type SPHC, bar thickness 30 mm,
When a plurality of A materials having a bar width of 1300 mm are rolled to a plate thickness of 3.2 mm and an outlet temperature of 870 ° C. by three rolling mills, a bar tail end of the A material and a subsequent steel type SPH are rolled.
C, the tip of material B having a bar thickness of 26 mm and a bar width of 1200 mm is connected at the entrance of the finishing mill, and is rolled to a sheet thickness of 2.3 mm and an exit temperature of 860 ° C. by the above three rolling mills. .
Here, the point of connection between the tail end of the bar A and the tip of the bar B is defined as point X.

The setting calculator section 300 sets the finishing rolls for the material B while the material A is being rolled by the finish rolling mill, ie, the roll gap of each stand, the roll peripheral speed, the tension between the stands, the looper height, and the like. The roll bending force and the like are set and calculated in advance.

First, when it is detected by a well-known tracking function (not shown) that the connection point X of the material A and the material B has reached, for example, the i-stand of the finishing mill, the roll gap, roll bending and mass flow control of the i-stand are performed. The roll peripheral speed and the looper control are changed as follows. (1) Change of roll gap of i-stand

When it is determined from the tracking detection signal input to the setting calculation section 300 that the connection point X of the material A and the material B has reached the i-stand, the roll gap command value input to the roll gap control device 104 S _i ^REF Is changed from the current value to the set value of the material B in a ramp shape. Therefore, the roll gap control device 104 is
Is controlled based on the set value of the B material. (2) Change of roll bending of i-stand

Similarly to the change of the roll gap, when it is detected that the connection point X has reached the i-stand by the tracking detection signal input to the setting calculator 300, the roll bending command value F _i ^REF Is changed from the current value to the set value of the material B in synchronization with the roll gap, and is input to the roll bending control device 105 via the switch 106. Therefore, the roll bending control device 105 controls the roll bending force of the rolling mill 101 based on the set value of the B material.

In this case, the switch 106 is switched to the automatic bending device when the connection point X arrives at the i-stand without using the roll bending command value from the setting calculation unit 300, and the roll determined by the automatic bending device is used. Bending change ΔF _i ^REF To the roll bending control device 105 to change the roll bending force.

Here, the automatic bending device is an i-
Rolling load detected by the rolling load measuring device 103
Roll bending change ΔF based on the measurement signal_i
^REF Is obtained by the following equation. ΔF_i ^REF  = ｛-(Dβ_i/ Dp_i) / (Dβ_i/ DF_i)｝ ・ (P_i-P_i ^L ) …… (1) where p_i: Rolling load of i-stand p_i ^L : Pressure of i-stand just before X point enters i-stand
Rolling load dβ_i/ Dp_i: Rolling load p of i-stand_iBoard claws
Β_iCoefficient dβ_i/ DF_i: Roll bending force F of i-stand
_iPlate crown β_iCoefficient of influence The coefficient of influence is determined by using a well-known rolling theory or
Required separately by experiment. (3) Roll peripheral speed change by mass flow control First, the mass flow control device of each stand will be described.
You.

Now, when the connection point X is detected immediately before entering each stand by tracking the connection point between the material A and the material B, at that timing, various measuring instruments of each stand provide a roll peripheral speed measurement signal, In addition to taking in the output side tension measurement signal, roll gap measurement signal and rolling load measurement signal and storing them in the storage unit, the thickness, temperature, and width of the plate, which cannot be measured directly at each stand, are set using the well-known delay function. Based on the delay information of the measurement system obtained by dividing the interval into N equal parts (for example, N = 40), the thickness of the entrance side of each stand,
The exit side plate thickness is determined and stored in the storage unit. In this case, in the first stand of the finishing mill, the value in the final pass of the rough rolling mill (not shown) is delayed in consideration of the crop point (cut length). Further, the deformation resistance and the advance ratio calculated by the calculation are also stored in the storage unit. In addition, the delay of the material temperature of each stand can also correct | amend the temperature drop between stands using a well-known temperature drop type | formula. Here, paying attention to the i-stand, the deformation resistance can be obtained from the rolling load measurement signal using a well-known rolling logical equation shown in the following equation. _{k i = p i / (β} i · Ld i · θp i) ...... (2) However, i: _{stand, p} i: i stand rolling load, β
_i : plate width, L _di : contact arc length , θ _pi : rolling force function As another method for obtaining the deformation resistance, a well-known deformation resistance formula based on the input side plate thickness, the output side plate thickness, the material temperature, the roll peripheral speed, and the like. Can also be obtained by using

Now, the value stored in the storage unit of the mass flow control device 106 in the i-stand is represented by the input side thickness H _i.
^L , Out of the side plate thickness h _i ^L , The deformation resistance k _i ^L , The input side tension is t _i-1 ^L , The output side tension is t _i ^L Roll peripheral speed V _Ri ^L F _i ^L And

As described above, when the above-described information is stored in the storage unit of the mass flow control device 106 at the timing when the connection point X reaches the i-stand, the mass flow in the subsequent rolling is performed based on the stored information. Control is performed,
The roll peripheral speed of the i-stand is changed by the following equation.

ΔV _Ri / V _Ri ^L = (ΔV _{Ri + 1} / V _{Ri + 1} ^L ) + (Δh _{i + 1} / h _{i + 1} ^L ) + (Δf _{i + 1} / f _{i + 1} ^L ) − (ΔH _{i + 1} / H _{i + 1} ^L _{) - (Δf i / 1 +} f i L ) (3) Here, Δ indicates a change obtained by subtracting the stored value from each current value. The subscripts i and i + 1 indicate the stand positions in FIG.

Incidentally, in a continuous rolling mill, there is a feedback factor due to tension, and this causes an error. Therefore, in this embodiment, the following equation is used as a term relating to the outlet side plate thickness in order to eliminate the feedback factor from the above equation (3). That is, the difference between the current value and the stored value is Δh _{i + 1} = h _{i + 1} −h _{i + 1} ^L (4) .

Also, using a gauge meter type, the input side tension
When correcting the variation of the exit side tension to the rolling load _{and, h i + 1 = S i} + 1 + {p i + 1 - (dp i + 1 / dt i) Δt i - (dp i + 1 / dt _{i + 1)} becomes _{Δt i + 1} / M i} + 1 ...... (5).

Where S _{i + 1} is the roll gap of the (i + 1) stand and M _{i + 1} is the mill constant of the (i + 1) stand. _{Also, dp i + 1 / dt i} , dp i + 1 / dt i + 1 is the influence function is separately determined by a well-known rolling formulas or test. Next, the advance rate f _{i + 1 in} equation (3) is generally known.
_{F i + 1 = f i +} 1 (H i + 1, h i + 1, k i + 1, t i, t i + 1) as a ...... (A1). The small change in the above equation (A1) is Δf _{i + 1} = (df _{i + 1} / dH _{i + 1} ) · ΔH _{i + 1} + (df _{i + 1} / dh _{i + 1} ) · Δh _{i + 1} + (df _{i + 1 / dk i + 1} ) · Δk i + 1 + (df i + 1 / dt i) · Δt i + (df i + 1 / dt i + 1) · Δt i + 1 ...... and (A2) Become. Here, the tension terms Δt _i and Δt _{i + 1} are eliminated,
That is, if Δt _i = 0.0 and Δt _{i + 1} = 0.0, Δf _{i + 1} = (df _{i + 1} / dH _{i + 1} ) · ΔH _{i + 1} + (df _{i + 1} / dh _{i +1} ) ・ Δh _{i + 1} + (df _{i + 1} / dki _{+ 1} ) ・ Δk _{i + 1} (6) In addition, the advanced rate f _{i in} equation (3) is also the same as described above.
Against Delta] f _i which is determined by the same concept, the tension term Δt
_i , Δt _{i + 1} is eliminated, that is, Δt _i = 0.0,
When _{Δt i + 1 = 0.0, Δf} i = (df i / dH i) · ΔH i + (df i / dh i) · Δh i + (df i / dk i) · Δk i ...... (7 ) . ΔVR _{i + 1} / VR _{i + 1} ^{L in the} equation (3) is a so-called successful term.

Note that df _{i + 1} / dH _{i + 1} , df _{i + 1} / d
_{h i + 1, df i +} 1 / dk i + 1, df i / dH i, df i
_{/ Dh i, df i / dk} i is influence coefficient is separately determined by a well-known rolling theory type or experiment.

The roll peripheral speed is obtained by performing the mass flow control by the expression (3) using the expressions (4) to (7), and the roll peripheral speed is given to the adder 108 as a correction value to obtain the roll peripheral speed command value. By making the correction, the roll peripheral speed of the i-stand can be changed. (4) Looper control for changing between runs

The looper non-interference control devices 14 and 114 are constantly operating during rolling. For example, between the i stand and the (i + 1) stand, the tension command value T _i ^REF input to the looper non-interference control device 14 matches the tension measurement value, and the looper angle command value θ _i ^REF matches the looper angle detection value. In addition to controlling the speed control device (or current control device) 112 and providing the roll peripheral speed output at that time to the adder 115 as a correction value, the output of the adder 108 of the roll peripheral speed control system of each of the stands described above is provided. Is added to In this case, the connection point X is i to
(I + 1) may be set to be lower command value between i to (i + 1) stand when in between stands.

When the connection point X between the material A and the material B reaches, for example, the (i + 1) stand, the tension command value T _i ^REF And looper angle command value θ _i ^REF Is changed from the current value to a set value by the setting calculation of the material B in a ramp shape in synchronization with the change of the roll gap. Therefore, during the change of the running distance, both the tension and the looper angle are maintained at the command values.

The above is the connection point X between the material A and the material B on the i-stand.
However, it is needless to say that the same change in running distance as described above is performed in the other stands as well. In addition, the change between runs is performed not only immediately before the connection point X enters each stand, but also at other times. In this case, only the plate thickness is changed.

As described above, in this embodiment, the hot strip which continuously rolls the preceding A material and subsequent B material having different steel types, plate thicknesses, plate widths, and material temperatures by a plurality of rolling mills (stands). In the finishing mill of the mill, the tracking function tracks the connection point X between the material A and the material B, and when the point X reaches each stand, the roll gap and roll bending force of each stand are set to the finish rolling mill of the material A. From the value to the set value of the finishing mill of material B in the form of a ramp, and just before the connection point X enters the first stand,
The exit side plate thickness, deformation resistance, entrance side tension, exit side tension, roll peripheral speed, and advance rate are stored, and the mass flow control is performed by using these stored values and the current value to perform the control of each stand based on the above-described equation (3). The roll peripheral speed is obtained, the roll peripheral speed command value is corrected based on the roll peripheral speed output, the roll peripheral speed is changed, and the looper control is performed so that the tension between the stands and the looper angle are maintained at the command values. This is to change the interval.

Accordingly, the control system takes into account the correlation between the controls, and the rolling control at the time of changing the running distance can be performed stably and with high accuracy. In performing mass flow control, Δh _{i + 1} relating to the outlet side plate thickness and Δf _{i + 1} relating to the advance rate in the above equation (3), in order to take into account the deformation resistance of the material and to eliminate the foot-back factor due to tension. , Δf _i is obtained by an arithmetic expression in which the tension is eliminated by using the above formulas (4) to (7), so that the problem caused by the feedback of the deformation resistance and the tension is complicated. Can be resolved without having to do so. Although not described in the above embodiment, the following control is also performed when changing the running distance of the finishing mill.

In the finishing mill, a side guide is provided immediately before entering each stand, and the set width of the side guide can be generally changed according to the sheet width of the material to be rolled. Therefore, when changing the running distance, the delay information of the plate width input to the mass flow controller is set by the setting calculation unit 3.
Immediately before the connection point X between the material A and the material B reaches the side guide, the side guide receives the sheet width of the material _B + α _B (α _B
Is changed to a fixed value, for example, 15 mm).

On the other hand, the command value of the finishing temperature is generally different between the material A and the material B. For this reason, the set value of the roll peripheral speed of the pivot stand (usually the final stand) of the finishing mill is different from the set values of the other stands. Thus, it is well known that if the speed of the pivot stands is changed, the speed of each stand will also change in proportion thereto.

To change the running distance of the pivot stand, the connection point X between the material A and the material B is located at the center of the finishing mill of the finishing mill (for example, in the case of a finishing mill having seven stands, the fourth point). At the time of reaching the stand, the roll peripheral speed of the pivot stand is changed from the current value to the set value of the material B in a ramp shape (for example, 50 mpm / s). Next, another embodiment of the present invention will be described.

(A) Although the finish rolling mill of the hot strip mill has been described in the above embodiment, the present invention can be applied to a rolling mill having another mill configuration by changing a part of the configuration in the same manner as described above. It is. For example, in the case of a pair cross mill, the cross angle setting may be changed similarly to the roll bending setting change. In the case of a CVC mill, the setting of the CVC roll shift may be changed in the same manner.

Further, in the case of a six-stage mill, the setting of the intermediate roll shift may be changed in the same manner. Further, the work roll shift does not necessarily have to be performed by tracking the connection point X.

(B) In the above embodiment, the looper control was performed by the non-interference controller, but the LQ control (Linear Quadratur
e) Control, that is, optimal regulator and IQC (Inverse Li
Any deviation such as nearQuadrature control or H∞ control may be used.
Further, conventional looper control may be used. Further, the present invention can be similarly applied to a looperless rolling mill that does not use a looper. (C) In the above-described embodiment, the tension measurement signal is obtained by the tension measuring device. However, the tension measurement signal may be obtained from the voltage, current, rotation speed, and the like of the looper motor. (D) The running distance changing means is not limited to the above embodiment, and may be as follows.

(I-1) The tension between the i-stands is controlled by the roll gap of the i-stand, and the looper controls only the looper angle. Value and the roll gap may be automatically changed by tension control. Further, in the configuration of FIG. 1, both the roll gap and the roll peripheral speed may be changed from the set value of the material A to the set value of the material B.

[0052]

As described above, according to the present invention, it is possible to provide a method and an apparatus for controlling a continuous rolling mill that can stably and accurately perform rolling control when changing running distances with a simple configuration. .

[Brief description of the drawings]

FIG. 1 is a system configuration diagram for describing a control method and apparatus of a hot strip mill finishing mill as a continuous mill according to the present invention.

[Explanation of symbols]

1,101,201 ... rolling mill of each stand, 2,10
2,202: Roll drive motor, 3, 103, 203
... rolling load measuring device, 4, 104, 204 ... roll gap control device, 5, 105, 205 ... roll bending control device, 6, 106, 206 ... mass flow control device, 7, 107, 207 ... speed Control device, 8, 1
08, 208 ... adder, 9, 109, 209 ... looper roll, 10, 110, 210 ... looper electric motor, 1
1,111: Looper rotating shaft, 12, 112: Tension measuring device, 13: Rolled material, 14, 114: Looper non-interference control device, 15, 115, 215: Adder, 300
...... Setting calculation unit.

Claims (4)

(57) [Claims] 1. Continuous rolling in which a plurality of rolling mills (stands) are connected, and a preceding material and a succeeding material having different steel types, sheet thicknesses, sheet widths, and material temperatures are connected on the entry side of the first stand to perform continuous rolling. The tracking function tracks the connection point of the preceding material and the succeeding material by the tracking function, and detects that the connection point of the two materials has reached each stand, and determines the roll gap and roll bending force of each stand to the set values of the preceding material. From the setting value of the subsequent material to the ramp-shaped and control each, and the connection side thickness of each stand obtained from the measurement system before the connection point of the two materials enters the continuous rolling mill,
The exit side plate thickness, the entrance side tension, the exit side tension, the roll peripheral speed and the deformation resistance obtained by calculation, the advance rate are stored, and the stored value of each stand is determined by the timing at which the connection point of the two materials enters the continuous rolling mill. And the current value corresponding to this stored value
Used and the tension components included in Δh _{i + 1} , Δf _{i + 1} , and Δf _i
There arithmetic expression ^{_{ΔV Ri / V Ri L = (}} ΔV Ri + 1 / V Ri + 1 L) by a mass flow controller that has been corrected or removed _{+ (Δh i + 1 / h} i + 1 L) + (Δf i + 1 / f i + ^{_{1 L) - (ΔH i +}} 1 / H i + 1 L) - (Δf i / 1 + f i L) ( where, i stand number, V _R ^L is the stored value of the roll peripheral speed, [Delta] V _R is the roll peripheral speed The difference between the current value and the stored value of h ^L
Is the stored value of the outlet plate thickness, Δh is the difference between the current value and the stored value of the outlet plate thickness, f ^L is the stored value of the advanced rate, Δf is the difference between the current value of the advanced rate and the stored value, and H ^L is the input. The stored value of the side plate thickness, ΔH is the difference between the current value of the input side plate thickness and the stored value), and the roll peripheral speed command value of each stand is corrected by the roll peripheral speed obtained from the roll peripheral speed to control the speed of each stand. A method for controlling a continuous rolling mill, characterized in that: 2. When the roll peripheral speed is changed by mass flow control, a tension and a looper angle set value of each stand and a tension and a looper angle detection value are further input so that the tension and the looper angle do not interfere with each other. The method for controlling a continuous rolling mill according to claim 1, wherein the angle is controlled. 3. Continuous rolling in which a plurality of rolling mills (stands) are connected, and a preceding material and a succeeding material having different steel types, sheet thicknesses, sheet widths, and material temperatures are connected on the inlet side of the first stand to perform continuous rolling. In the machine, each is provided corresponding to each stand,
When the tracking function detects that the connection point of the two materials has reached each stand by tracking the connection point of the preceding material and the succeeding material, the roll gap of each stand is ramped from the setting value of the preceding material to the setting value of the succeeding material. Roll gap control means for changing the shape and controlling each of them, and a roll gap controlling means provided for each stand, and when the tracking function detects that the connection point of the two materials has reached each stand, the roll bending of each stand is performed. Roll bending control means for controlling the force by changing the force from the set value of the preceding material to the set value of the succeeding material in a ramp shape, and provided respectively for each stand,
Before entering the continuous rolling mill, the entrance side plate thickness, the exit side plate thickness, the entrance side tension, the exit side tension of each stand obtained from the measurement system, the deformation resistance obtained by the roll peripheral speed and calculation, and the advance rate are stored, and using the current value which the connection point of the both materials corresponds to the stored value and the stored value of each stand by the timing entering the continuous rolling mill, and _{Δh i + 1, Δf i +} 1, the Delta] f _i
Included tension content corrected or removed arithmetic expression by the mass flow controller ^{_{ΔV Ri / V Ri L = (}} ΔV Ri + 1 / V Ri + 1 L) + (Δh i + 1 / h i + 1 L) + (Δf i + 1 ^{_{/ f i + 1 L) -}} (ΔH i + 1 / H i + 1 L) - (Δf i / 1 + f i L) ( where, i stand number, V _R ^L is the stored value of the roll peripheral speed, [Delta] V _R Is the difference between the current value of roll peripheral speed and the stored value, h ^L
Is the stored value of the outlet plate thickness, Δh is the difference between the current value and the stored value of the outlet plate thickness, f ^L is the stored value of the advanced rate, Δf is the difference between the current value of the advanced rate and the stored value, and H ^L is the input. A mass flow control means for correcting the roll peripheral speed of each stand by a roll peripheral speed correction value obtained from the stored value of the side plate thickness, ΔH is the difference between the current value and the stored value of the incoming side plate thickness, and changing the roll peripheral speed; A speed control means for controlling the speed of each stand based on the roll peripheral speed command value corrected by the mass flow control means. 4. A tensioner and a looper angle set value, and a tension and a looper angle detection value, respectively, are provided corresponding to the looper rolls between the stands, and the tension and the looper angle detection value are changed by the mass flow control means. The looper control means for correcting a roll peripheral speed command value input to the speed control means so that the looper angles do not interfere with each other and for controlling a looper angle of the looper roll is provided. Control device for continuous rolling mill.