TWI579066B - Sheet thickness control device for rolling material - Google Patents

Description

Roll thickness control device

The invention relates to a plate thickness control device for rolled products.

Patent Document 1 discloses a plate thickness control device for a rolled product. The thickness control device calculates the first deviation between the measured value of the entry side thickness gauge and the reference value of the entry side. The thickness control device calculates the second deviation between the measured value of the side thickness gauge and the reference value of the exit side. The thickness control device adjusts the gain of the feedforward AGC based on the first deviation and the second deviation.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-170210

However, in the case described in Patent Document 1, it takes time for the rolled material to reach the exit side thickness gauge from the rolling mill. As a result, the adjustment of the gain of the feedforward AGC is delayed. Therefore, the precision of the thickness of the rolled material on the exit side of the rolling mill cannot be improved.

The present invention has been developed to solve the above problems. It is an object of the present invention to provide a thickness control device for a rolled product which can improve the precision of the thickness of the rolled material in the exit side of the rolling mill.

The thickness control device for the rolled material of the present invention includes: a first setting unit that sets the rolling mill according to the first deviation between the measured value of the thickness of the rolled material on the entry side of the rolling mill and the reference value The first change amount of the roll gap; the second setting portion is based on the actual measured value of the thickness of the rolled material on the entry side of the rolling mill, the measured value of the speed, and the rolling of the exit side of the rolling mill The second deviation between the estimated value of the thickness of the rolled material on the exit side of the rolling mill calculated from the measured value of the material speed and the second deviation from the reference value of the thickness of the rolled material on the exit side of the rolling mill is set. The second change amount of the roll gap of the rolling mill; the third setting unit is set based on the first change amount set by the first setting unit and the second change amount set by the second setting unit The operation amount of the roll gap of the rolling mill; and the adjustment unit adjusts the first setting unit based on a comparison result between the first deviation of the entry side of the rolling mill and the second deviation of the exit side of the rolling mill Gain.

According to the invention, the gain of the first setting unit is adjusted in accordance with a comparison result between the first deviation on the entry side of the rolling mill and the second deviation on the exit side of the rolling mill. Therefore, the thickness precision of the rolled material on the exit side of the rolling mill can be improved

1‧‧‧Rolling machine

2‧‧‧Upper workpiece roll

3‧‧‧ Lower workpiece roll

4‧‧‧ drive

5‧‧‧Repression device

6‧‧‧Into the side plate speedometer

7‧‧‧Inside side thickness gauge

8‧‧‧Outside plate speedometer

9‧‧‧Sheet thickness control device

9a‧‧‧1st setting department

9b‧‧‧2nd setting department

9c‧‧‧3rd setting department

9d‧‧‧Adjustment Department

10‧‧‧Rolling material

11‧‧‧Processing Circuit

11a‧‧‧ Processor

11b‧‧‧ memory

12a‧‧‧Feed-for-feed AGC controller

12b‧‧‧ estimator

12c‧‧‧Quality Flow AGC Controller

13‧‧‧Hydraulic pressure position control system

14‧‧‧1st transform block

15‧‧‧2nd transform block

Fig. 1 is a rolling system to which a sheet thickness control device for rolled products according to Embodiment 1 of the present invention is applied.

Fig. 2 is a block diagram showing a thickness control device for a rolled material according to a first embodiment of the present invention.

Fig. 3 is a view showing a hardware configuration of a sheet thickness control device for a rolled product according to a first embodiment of the present invention.

Fig. 4 is a block diagram showing a first setting unit of the thickness control device for rolled products according to the first embodiment of the present invention.

Fig. 5 is a block diagram showing a second setting unit of the thickness control device for rolled products according to the first embodiment of the present invention.

Fig. 6 is a flow chart for explaining the operation of the sheet thickness control device for the rolled product according to the first embodiment of the present invention.

Fig. 7 is a view showing a simulation result of control by the thickness control device of the rolled material according to the first embodiment of the present invention.

Fig. 8 is an enlarged view showing a simulation result when the gain of the first setting unit is not adjusted by the adjustment unit of the thickness control device for rolled material according to the first embodiment of the present invention.

Fig. 9 is an enlarged view showing a simulation result when the gain of the first setting unit is adjusted by the adjustment unit of the thickness control device for rolled material according to the first embodiment of the present invention.

The form for carrying out the invention will be described with reference to the drawings. In addition, the same or corresponding parts in the drawings are denoted by the same symbols. Repeated description of this section is appropriately simplified or omitted.

Embodiment 1

Fig. 1 is a rolling system to which a sheet thickness control device for rolled products according to Embodiment 1 of the present invention is applied.

In the first drawing, the rolling mill 1 includes an upper workpiece roll 2, a lower workpiece roll 3, a drive unit 4, and a reduction device 5.

The upper workpiece roll 2 and the lower workpiece roll 3 are arranged in the vertical direction. For example, the drive unit 4 is composed of a motor and a drive unit. The output portion of the drive unit 4 is connected to the input portion of the upper workpiece roll 2 and the input portion of the lower workpiece roll 3. The pressing device 5 is disposed above the upper workpiece roll 2.

The entry side plate speedometer 6 is disposed on the entry side of the rolling mill 1. The entry side thickness gauge 7 is provided between the rolling mill 1 and the entrance side panel speedometer 6. The exit side plate speedometer 8 is disposed on the exit side of the rolling mill 1.

The thickness control device 9 is composed of a PLC or the like. The first input portion of the plate thickness control device 9 is connected to the output portion of the entry side plate speedometer 6. The second input portion of the thickness control device 9 is connected to the output portion of the entry side thickness gauge 7. The third input portion of the plate thickness control device 9 is connected to the output portion of the exit side plate speedometer 8. The first output portion of the plate thickness control device 9 is connected to the input portion of the drive device 4. The second output portion of the plate thickness control device 9 is connected to the input portion of the reduction device 5.

In the rolling system, the upper workpiece roll 2 and the lower workpiece roll 3 are sandwiched between the rolled webs 10. The entrance side plate speedometer 6 measures the conveyance speed of the rolled material 10 by laser or the like on the entry side of the rolling mill 1. The entry side thickness gauge 7 is used to measure the rolled material 10 by X-ray, γ-ray, etc. in the entry side of the rolling mill 1 thickness. The exit side plate speedometer 8 measures the conveyance speed of the rolled material 10 by laser or the like in the exit side of the rolling mill 1.

The plate thickness control device 9 controls the drive device 4 and the reduction device 5 based on the measured values of the entry side plate speed gauge 6, the entry side thickness gauge 7, and the exit side plate speedometer 8. As a result, the tension applied to the rolled material 10 is controlled in the entry side and the exit side of the rolling mill 1. And controlling the distance between the upper workpiece roll 2 and the lower workpiece roll 3.

Specifically, the entry side plate speedometer 6 outputs the measured value v _in ^res (mm/s) of the conveyance speed of the rolled web 10. The entry side thickness gauge 7 outputs the measured value H ^res (mm) of the thickness of the rolled web 10 . The exit side plate speedometer 8 outputs the measured value v _out ^res (mm/s) of the conveying speed of the rolled web 10.

The plate thickness control device 9 calculates the angular velocity reference value ω _roll ^ref (rad/s) based on the measured value v _in ^res , the measured value H ^res , and the measured value v _out ^res . The driving device 4 rotates the upper workpiece roll 2 and the lower workpiece roll 3 in accordance with the reference value ω _roll ^ref .

The plate thickness control device 9 sets the reference value ΔS _FF ^ref (mm) of the first change amount of the roll gap of the rolling mill 1 by the actual measurement value H ^res . The sheet thickness control device 9 is traced from the entry side thickness gauge 7 to the depression point by the data shift register. At this time, the plate thickness control device 9 sets the reference value ΔS _MF ^ref of the second variation amount of the roll gap in the rolling mill 1 by using the measured value H ^res , the measured value v _in ^res , and the measured value v _out ^res ( Mm).

The pressing device 5 changes the distance between the upper workpiece roll 2 and the lower workpiece roll 3 in accordance with the total value of the reference value ΔS _FF ^ref and the reference value ΔS _MF ^ref .

Next, an example of the thickness control device 9 will be described using FIG.

Fig. 2 is a block diagram showing a thickness control device for a rolled material according to a first embodiment of the present invention.

As shown in FIG. 2, the thickness control device 9 includes a first setting unit 9a, a second setting unit 9b, a third setting unit 9c, and an adjustment unit 9d.

The first setting unit 9a sets the rolling mill 1 in accordance with the first deviation ΔH (mm) between the measured value H ^res of the thickness of the rolled material 10 on the entry side of the rolling mill 1 and the reference value H _n (mm). The reference value ΔS _FF ^ref of the first variation of the roll gap. The second setting unit 9b is an actual measured value H ^res of the thickness of the rolled material 10 on the entry side of the rolling mill 1 , an actual measured value v _in ^res of the speed, and a measured value v _out of the speed of the exit side of the rolling mill 1 ^{Res is} used to calculate the estimated value h ^res (mm) of the thickness of the rolled material 10 on the exit side of the rolling mill 1 . The second setting unit 9b sets the reference value ΔS _MF ^ref of the second variation amount of the roll gap of the rolling mill 1 based on the second deviation Δh (mm) between the estimated value h ^res and the reference value h _n (mm). . The third setting unit 9c is based on the reference value ΔS _FF ^ref of the first change amount set by the first setting unit 9a and the reference value ΔS _MF ^ref of the second change amount set by the second setting unit 9b. The operation amount of the roll gap of the rolling mill 1 is set. The adjustment unit 9d automatically and sequentially adjusts the gain of the first setting unit 9a based on the comparison between the first deviation of the entry side of the rolling mill 1 and the second deviation of the exit side of the rolling mill 1.

Next, an example of the hardware configuration of the thickness control device 9 will be described using FIG.

Fig. 3 is a view showing a hardware configuration of a sheet thickness control device for a rolled product according to a first embodiment of the present invention.

As shown in FIG. 3, the plate thickness control device 9 is provided with a processing circuit 11. The processing circuit 11 includes a processor 11a and a memory 11b. The operation of each unit of the board thickness control device 9 of Fig. 2 is realized by at least one processor 11a executing a program stored in at least one of the memories 11b.

Next, the control by the first setting unit 9a will be described using FIG.

Fig. 4 is a block diagram showing a first setting unit of the thickness control device for rolled products according to the first embodiment of the present invention.

As shown in Fig. 4, the first setting unit 9a includes a feedforward AGC controller 12a. The transfer function C _FF of the feedforward AGC controller 12a is set at K _{P — FF} . The output of the feedforward AGC controller 12a is connected to the input of the hydraulic pressure position control system 13. The hydraulic pressure position control system 13 includes a servo valve and a hydraulic piping system of the reduction device 5. The transfer function of the hydraulic pressure position control system 13 is denoted by Gp. The output portion of the hydraulic pressure position control system 13 is connected to the input portion of the first conversion block 14. The output unit of the first transform block 14 is connected to the input unit of the second transform block 15.

In the entry side of the rolling mill 1, the first deviation ΔH of the thickness of the rolled material 10 is expressed by the following formula (1).

[Formula 1] △ H = H _n - H ^res (1)

The first deviation ΔH is input to the feedforward AGC controller 12a. The feedforward AGC controller 12a calculates a reference value ΔS _FF ^ref of the first change amount of the nip. The reference value ΔS _FF ^ref is calculated such that the direction in which the interval between the workpiece roll 2 and the lower workpiece roll 3 is narrowed becomes a negative value.

The hydraulic pressure position control system 13 changes the distance between the upper workpiece roll 2 and the lower workpiece roll 3 in accordance with the reference value ΔS _FF ^ref .

The first conversion block 14 converts the amount of change ΔS _FF (mm) of the distance between the upper workpiece roll 2 and the lower workpiece roll 3 into the amount of change ΔP _FF (kN) of the rolling load. The amount of change in the rolling load ΔP _FF is expressed by the following formula (2).

In the formula (2), M is a rolling mill constant (kN/mm) indicating the extension of the rolling mill due to the rolling load. The Q system indicates the plasticity coefficient (kN/mm) of the thickness change due to the rolling load.

The second transform block 15 converts the change amount ΔP _FF of the rolling load into the amount of change ΔP _FF /M of the rolling mill extension.

In the exit side of the rolling mill 1, the amount of change Δh _FF (mm) of the thickness of the rolled material 10 is expressed by the following formula (3).

Next, using the fifth figure, the second setting unit will be described. 9b control.

Fig. 5 is a block diagram showing a second setting unit of the thickness control device for rolled products according to the first embodiment of the present invention.

As shown in Fig. 5, the second setting unit 9b includes an illuminator 12b and a mass flow AGC controller 12c. The output of the estimator 12b is connected to the input of the mass flow AGC controller 12c. The transfer coefficient C _MF of the mass flow AGC controller 12c is set to K _{P_MF} + K _{I_MF} / s. However, s is a Laplacian operator. The output portion of the mass flow AGC controller 12c is connected to the input portion of the hydraulic pressure position control system 13. The hydraulic pressure position control system 13 includes a servo valve and a hydraulic piping system of the reduction device 5. The transfer function of the hydraulic pressure position control system 13 is denoted by Gp. The output portion of the hydraulic pressure position control system 13 is connected to the input portion of the first conversion block 14. The output unit of the first transform block 14 is connected to the input unit of the second transform block 15.

The estimator 12b calculates the estimated value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 by the mass flow fixed side. Specifically, the estimated value h ^res is expressed by the following formula (4).

In the exit side of the rolling mill 1, the second deviation Δh of the thickness of the rolled material 10 is expressed by the following formula (5).

[Equation 5] Δ h = h _n - h ^res (5)

The second deviation Δh is input to the mass flow AGC controller 12c. The mass flow AGC controller 12c calculates a reference value ΔS _MF ^ref of the second variation amount of the nip. The reference value ΔS _MF ^ref is calculated such that the direction in which the interval between the workpiece roll 2 and the lower workpiece roll 3 is narrowed becomes a negative value.

The hydraulic pressure position control system 13 changes the distance between the upper workpiece roll 2 and the lower workpiece roll 3 in accordance with the reference value ΔS _MF ^ref .

The first transform block 14 converts the amount of change ΔS _MF (mm) of the distance between the upper workpiece roll 2 and the lower workpiece roll 3 into the amount of change ΔP _MF (kN) of the rolling load. The amount of change in the rolling load ΔP _MF is expressed by the following formula (6).

In the formula (6), M represents the rolling mill constant (kN/mm) of the rolling mill stretching due to the rolling load. The Q system indicates the plasticity coefficient (kN/mm) of the thickness change due to the rolling load.

The second transform block 15 converts the change amount ΔP _MF of the rolling load into the amount of change ΔP _MF /M of the rolling mill extension.

In the exit side of the rolling mill 1, the variation amount Δh _MF (mm) of the thickness of the rolled material 10 is expressed by the following formula (7).

Next, the operation of the adjustment unit 9d will be described using Fig. 6 .

Fig. 6 is a flow chart for explaining the operation of the sheet thickness control device for rolled products according to the first embodiment of the present invention.

In step S1, the adjustment unit 9d determines whether or not the product of the first deviation ΔH and the second deviation Δh is zero.

When the product of the first deviation ΔH and the second deviation Δh is 0 in step S1, the process proceeds to step S2. In step S2, the adjustment amount ΔKp of the gain of the first setting unit 9a is set to zero. Then the action ends.

When the product of the first deviation ΔH and the second deviation Δh is not 0 in step S1, the process proceeds to step S3. In step S3, the adjustment unit 9d determines whether or not the sign of the first deviation ΔH and the second deviation Δh are the same. Specifically, the adjustment unit 9d determines whether or not the product of the first deviation ΔH and the second deviation Δh is greater than zero.

In step S3, when the sign of the first deviation ΔH and the sign of the second deviation Δh are the same, the product of the first deviation ΔH and the second deviation Δh is greater than zero. At this time, it progresses to step S4. In step S4, the adjustment unit 9d sets the adjustment amount ΔKp of the gain of the first setting unit 9a to a value larger than zero. Then the action ends.

When the positive/negative sign of the first deviation ΔH and the second deviation Δh are different in step S3, the product of the first deviation ΔH and the second deviation Δh is less than zero. At this time, the process proceeds to step S5. In step S5, the adjustment unit 9d is The adjustment amount ΔKp of the gain of the first setting unit 9a is set to a value smaller than zero. Then the action ends.

Next, the simulation result of the control by the plate thickness control device 9 will be described using FIG.

Fig. 7 is a view showing a simulation result of control by the thickness control device of the rolled material according to the first embodiment of the present invention.

The diagram at the top of Figure 7 shows a plot of line speed. The linear velocity is the peripheral speed of the workpiece roll 2 and the lower workpiece roll 3. The figure of the second stage from the top in Fig. 7 shows the tension applied to the rolled material 10 on the entry side and the exit side of the rolling mill 1. The figure of the third stage from the top in Fig. 7 shows the thickness of the rolled material 10 on the entry side and the exit side of the rolling mill 1. The lowermost graph of Fig. 7 shows a graph of the rolling load.

In the uppermost diagram of Fig. 7, the target value of the linear velocity is 100 (mpm). In the graph of the second stage from the top in Fig. 7, the target value of the tension applied to the rolled material 10 on the inlet side and the outlet side of the rolling mill 1 is 100 (MPa). In the graph of the third paragraph from the top in Fig. 7, the average value of the measured value H ^res of the thickness of the rolled web 10 on the entry side of the rolling mill 1 is 2.69 (mm). The target value (reference value) h _n of the thickness of the rolled material 10 on the exit side of the rolling mill 1 is 2.228 (mm). At this time, the rolling reduction ratio of the rolling mill 1 was 17.2%.

In the entry side of the rolling mill 1, the measured value H ^res of the thickness of the rolled web 10 varies. For example, the change corresponds to a sin wave. The amplitude of this variation is 0.0015 (mm). Before the time T becomes 2 (s), the stall tension is applied to the rolled material 10. The stall tension is set at 40% of the target value. Then, by increasing the linear velocity, the rolling of the rolled web 10 is started.

When the time T becomes 3.7 (s), the linear velocity reaches the target value. At this time, the thickness control device 9 starts the control of the thickness of the rolled material 10. By this control, the measured value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 is repeatedly changed.

When the number of times the measured value h ^res becomes the target value h _n reaches a predetermined number of times, the sheet thickness control device 9 adjusts the gain of the first setting unit 9a along the flow of Fig. 6 . For example, when the number of times the measured value h ^res becomes the target value h _n is six, the sheet thickness control device 9 adjusts the gain of the first setting unit 9a along the flow of Fig. 6 .

Next, the effectiveness of the control by the thickness control device 9 will be described using Figs. 8 and 9.

Fig. 8 is an enlarged view showing a simulation result when the gain of the first setting unit is not adjusted by the adjustment unit of the thickness control device for rolled material according to the first embodiment of the present invention. Fig. 9 is an enlarged view showing a simulation result when the gain of the first setting unit is adjusted by the adjustment unit of the thickness control device for rolled material according to the first embodiment of the present invention.

In Fig. 8, the measured value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 is repeatedly changed based on the target value h _n . This change does not converge.

In the ninth figure, when the time T is 4.2 (s), the adjustment unit 9d starts the adjustment of the gain of the first setting unit 9a. The measured value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 is repeatedly changed based on the target value h _n . This change does not converge.

According to the first embodiment described above, the first setting unit The gain of 9a is adjusted for each sampling based on the comparison between the first deviation ΔH on the entry side of the rolling mill 1 and the second deviation Δh on the exit side of the rolling mill 1. As a result, the gain of the first setting unit 9a is optimized. Therefore, the precision of the thickness of the rolled material 10 on the exit side of the rolling mill 1 can be improved.

Further, when the first deviation ΔH and the second deviation Δh have the same positive and negative signs, the adjustment unit 9d increases the gain of the first setting unit 9a, and the positive and negative of the first deviation ΔH and the second deviation Δh. When the signs are different, the gain of the first setting unit 9a is reduced. Therefore, the precision of the thickness of the rolled material 10 on the exit side of the rolling mill 1 can be improved by simple control.

Further, when the absolute value of the product of the first deviation ΔH and the second deviation Δh is smaller than a predetermined threshold value, the gain of the first setting unit 9a may be adjusted without using the adjustment unit 9d. At this time, the influence of the error of the estimated value h ^res caused by the fixed side of the mass flow can be eliminated. Moreover, the influence of the measurement noise of the side plate speedometer 6, the entry side thickness gauge 7, and the exit side plate speedometer 8 can be excluded.

(industrial availability)

As described above, the thickness control device for the rolled product of the present invention can utilize a system for improving the precision of the thickness of the rolled material on the exit side of the rolling mill.

9‧‧‧Sheet thickness control device

9a‧‧‧1st setting department

9b‧‧‧2nd setting department

9c‧‧‧3rd setting department

9d‧‧‧Adjustment Department

Claims (3)

A plate thickness control device for a rolled product includes a first setting unit that sets the rolling mill according to a first deviation between a measured value of a thickness of a rolled material on a side of a rolling mill and a reference value. The first change amount of the roll gap; the second setting portion is based on the actual measurement value of the thickness of the rolled material on the entry side of the rolling mill, the measured value of the speed, and the rolled material on the exit side of the rolling mill The second deviation between the estimated value of the thickness of the rolled material on the exit side of the rolling mill and the reference value of the thickness of the rolled material on the exit side of the rolling mill calculated from the measured value of the speed is set. The second change amount of the roll gap of the rolling mill; the third setting unit sets the aforementioned amount based on the first change amount set by the first setting unit and the second change amount set by the second setting unit The operation amount of the roll gap of the rolling mill; and the adjustment unit adjusts the first setting unit based on a comparison result between the first deviation of the entry side of the rolling mill and the second deviation of the exit side of the rolling mill Gain. The apparatus for controlling the thickness of the rolled material according to the first aspect of the invention, wherein the adjustment unit increases the gain of the first setting unit when the first deviation and the positive or negative sign of the second deviation are the same When the first deviation is different from the positive or negative sign of the second deviation, the gain of the first setting unit is reduced. The thickness control device for rolled products according to the first or second aspect of the invention, wherein the adjustment unit is the first deviation and the first When the absolute value of the product of the deviation is smaller than the threshold value set in advance, the gain of the first setting unit is not adjusted.