JPWO2016151855A1 - Thickness control device for rolled material - Google Patents

Abstract

Provided is a rolled material thickness control device capable of increasing the accuracy of the thickness of a rolled material on the exit side of a rolling mill. A rolled material thickness control apparatus includes a first setting unit that sets a first change amount of a roll gap based on a first deviation between a measured value and a reference value of the thickness of the rolled material on the entry side of the rolling mill; Of the rolling material on the exit side of the rolling mill calculated by the actual measurement value of the thickness of the rolled material on the entry side of the rolling mill and the actual measurement value of the speed on the entry side of the rolling mill A second setting unit configured to set a second change amount of the roll gap based on a second deviation between the estimated value of the thickness and the reference value; the first change amount set by the first setting unit; and the second setting unit. A third setting unit for setting an operation amount of a roll gap in the rolling mill based on a second change amount set by the unit, a first deviation on the entry side of the rolling mill, and a first deviation on the exit side of the rolling mill. Adjust the gain of the first setting unit based on the comparison result with 2 deviations An adjustment unit, equipped with.

Description

  The present invention relates to a sheet thickness control device for rolled material.

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

Japanese Unexamined Patent Publication No. 2003-170210

  However, in the thing of patent document 1, it takes time until a rolling material reaches | attains a delivery side thickness gauge from a rolling mill. As a result, adjustment of the feedforward AGC gain is delayed. For this reason, the precision of the thickness of the rolling material in the exit side of a rolling mill cannot be raised.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide a sheet thickness control device for a rolled material that can increase the accuracy of the thickness of the rolled material on the exit side of the rolling mill.

  The sheet thickness control device for a rolled material according to the present invention provides a first change amount of a roll gap in the rolling mill based on a first deviation between a measured value and a reference value of the thickness of the rolled material on the entry side of the rolling mill. The rolling calculated by the first setting portion to be set, the 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 measured value of the speed of the rolled material on the exit side of the rolling mill A second setting unit that sets a second change amount of the roll gap in the rolling mill based on a second deviation between the estimated value and the reference value of the thickness of the rolled material on the exit side of the mill, and the first setting unit A third setting unit for setting an operation amount of a roll gap in the rolling mill based on the set first variation amount and the second variation amount set by the second setting unit; and on the entry side of the rolling mill A first deviation and a second deviation on the exit side of the rolling mill; An adjustment unit that adjusts the gain of the first setting unit based on the comparison result, with a.

  According to this invention, the gain of the first setting unit is adjusted based on 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. For this reason, the precision of the thickness of the rolling material in the exit side of a rolling mill can be improved.

It is the rolling system to which the plate | board thickness control apparatus of the rolling material in Embodiment 1 of this invention was applied. It is a block diagram of the plate | board thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is a hardware block diagram of the sheet thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is a block diagram of the 1st setting part of the plate | board thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is a block diagram of the 2nd setting part of the sheet thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the sheet thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is a figure which shows the simulation result of control by the plate | board thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is an enlarged view which shows the simulation result when not adjusting the gain of a 1st setting part by the adjustment part of the sheet thickness control apparatus of the rolling material in Embodiment 1 of this invention. It is an enlarged view which shows the simulation result in the case of adjusting the gain of a 1st setting part by the adjustment part of the sheet thickness control apparatus of the rolling material in Embodiment 1 of this invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the part which is the same or it corresponds in each figure. The overlapping explanation of the part is appropriately simplified or omitted.

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

  In FIG. 1, a rolling mill 1 includes an upper work roll 2, a lower work roll 3, a driving device 4, and a reduction device 5.

  The upper work roll 2 and the lower work roll 3 are arranged in the vertical direction. For example, the drive device 4 includes a motor and a drive device. The output unit of the driving device 4 is connected to the input unit of the upper work roll 2 and the input unit of the lower work roll 3. The reduction device 5 is provided above the upper work roll 2.

  The entry side plate speedometer 6 is provided on the entry side of the rolling mill 1. The entry side plate thickness meter 7 is provided between the rolling mill 1 and the entry side plate speed meter 6. The exit side plate speedometer 8 is provided on the exit side of the rolling mill 1.

  The plate thickness control device 9 is made of PLC or the like. A first input unit of the plate thickness control device 9 is connected to an output unit of the entry side plate speed meter 6. The second input unit of the plate thickness control device 9 is connected to the output unit of the entry side plate thickness meter 7. The third input unit of the plate thickness control device 9 is connected to the output unit of the exit side plate speedometer 8. The first output unit of the plate thickness control device 9 is connected to the input unit of the driving device 4. The second output unit of the plate thickness control device 9 is connected to the input unit of the reduction device 5.

  In the rolling system, the upper work roll 2 and the lower work roll 3 sandwich the rolled material 10. The entry side plate speed meter 6 measures the feed speed of the rolled material 10 using a laser or the like on the entry side of the rolling mill 1. The entry side thickness gauge 7 measures the thickness of the rolled material 10 using X-rays, γ rays, etc. on the entry side of the rolling mill 1. The delivery side plate speed meter 8 measures the feed speed of the rolled material 10 using a laser or the like on the delivery side of the rolling mill 1.

  The plate thickness control device 9 controls the drive device 4 and the rolling-down device 5 based on the actually measured values of the entry side plate speed meter 6, the entry side plate thickness meter 7, and the exit side plate speed meter 8. As a result, the tension applied to the rolled material 10 is controlled on the entry side and the exit side of the rolling mill 1. The distance between the upper work roll 2 and the lower work roll 3 is controlled.

Specifically, the entry side plate speedometer 6 outputs an actual measurement value v _in ^res (mm / s) of the feed speed of the rolled material 10. The entry side thickness gauge 7 outputs an actual measurement value H ^res (mm) of the thickness of the rolled material 10. The delivery side plate speedometer 8 outputs an actual measurement value v _out ^res (mm / s) of the feed speed of the rolled material 10.

The plate thickness controller 9 calculates a reference value ω _roll ^ref (rad / s) of the angular velocity based on the actual measurement value v _in ^res , the actual measurement value H ^res, and the actual measurement value v _out ^res . The driving device 4 rotates the upper work roll 2 and the lower work roll 3 based on the reference value ω _roll ^ref .

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

The reduction device 5 changes the distance between the upper work roll 2 and the lower work roll 3 based on the total value of the reference value ΔS _FF ^ref and the reference value ΔS _MF ^ref .

Next, an example of the plate thickness control device 9 will be described with reference to FIG.
FIG. 2 is a block diagram of a rolled material thickness control apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the plate thickness controller 9 includes a first setting unit 9a, a second setting unit 9b, a third setting unit 9c, and an adjusting unit 9d.

The first setting unit 9a is configured to roll the roll in the rolling mill 1 based on 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). A reference value ΔS _FF ^ref for the first change amount of the gap is set. The second setting unit 9b uses the measured value H ^res of the thickness of the rolled material 10 on the entry side of the rolling mill 1 and the measured value v _in ^res of the speed and the measured value v _out ^res of the speed on the exit side of the rolling mill 1. An estimated value h ^res (mm) of the thickness of the rolled material 10 on the exit side of the rolled material 10 is calculated. The second setting unit 9b sets the reference value ΔS _MF ^ref of the second change amount of the roll gap in the rolling mill 1 based on the second deviation Δh (mm) between the estimated value h ^res and the reference value h _n (mm). To do. The third setting unit 9c is based on the first change amount reference value ΔS _FF ^ref set by the first setting unit 9a and the second change amount reference value ΔS _MF ^ref set by the second setting unit 9b. The operation amount of the roll gap in the rolling mill 1 is set. The adjusting unit 9d automatically and sequentially adjusts the gain of the first setting unit 9a based on the comparison result between the first deviation on the entry side of the rolling mill 1 and the second deviation on the exit side of the rolling mill 1.

Next, an example of the hardware configuration of the plate thickness control device 9 will be described with reference to FIG.
FIG. 3 is a hardware configuration diagram of the rolled material thickness control apparatus according to Embodiment 1 of the present invention.

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

Next, the control based on the 1st setting part 9a is demonstrated using FIG.
FIG. 4 is a block diagram of the first setting unit of the sheet thickness control apparatus for rolled material according to Embodiment 1 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 to _{K P_FF.} The output part of the feedforward AGC controller 12 a is connected to the input part of the hydraulic pressure reduction position control system 13. The hydraulic pressure reduction position control system 13 includes a servo valve of the reduction device 5 and a hydraulic piping system. The transfer function of the hydraulic pressure reduction position control system 13 is represented by Gp. The output part of the hydraulic pressure reduction position control system 13 is connected to the input part of the first conversion block 14. The output unit of the first conversion block 14 is connected to the input unit of the second conversion block 15.

  On 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 equation (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 roll gap. The reference value ΔS _FF ^ref is calculated so that the direction in which the space between the upper work roll 2 and the lower work roll 3 is narrow is negative.

The hydraulic pressure reduction position control system 13 changes the distance between the upper work roll 2 and the lower work roll 3 based on the reference value ΔS _FF ^ref .

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

  In the formula (2), M is a mill constant (kN / mm) representing mill elongation due to rolling load. Q is a plastic coefficient (kN / mm) representing a change in thickness due to a rolling load.

The second conversion block 15 converts the rolling load change amount ΔP _FF into a mill elongation change amount ΔP _FF / M.

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

Next, the control based on the 2nd setting part 9b is demonstrated using FIG.
FIG. 5 is a block diagram of the second setting unit of the sheet thickness control apparatus for rolled material according to Embodiment 1 of the present invention.

As illustrated in FIG. 5, the second setting unit 9b includes an estimator 12b and a mass flow AGC controller 12c. The output unit of the estimator 12b is connected to the input unit 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. Here, s is a Laplace operator. The output part of the mass flow AGC controller 12 c is connected to the input part of the hydraulic pressure reduction position control system 13. The hydraulic pressure reduction position control system 13 includes a servo valve of the reduction device 5 and a hydraulic piping system. The transfer function of the hydraulic pressure reduction position control system 13 is represented by Gp. The output part of the hydraulic pressure reduction position control system 13 is connected to the input part of the first conversion block 14. The output unit of the first conversion block 14 is connected to the input unit of the second conversion 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 on the constant mass flow side. Specifically, the estimated value h ^res is expressed by the following equation (4).

  On 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 equation (5).

The second deviation Δh is input to the mass flow AGC controller 12c. The mass flow AGC controller 12c calculates the reference value ΔS _MF ^ref of the second change amount of the roll gap. The reference value ΔS _MF ^ref is calculated so that the direction in which the space between the upper work roll 2 and the lower work roll 3 is narrow is negative.

The hydraulic pressure reduction position control system 13 changes the distance between the upper work roll 2 and the lower work roll 3 based on the reference value ΔS _MF ^ref .

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

  In the formula (6), M is a mill constant (kN / mm) representing mill elongation due to rolling load. Q is a plastic coefficient (kN / mm) representing a change in thickness due to a rolling load.

The second conversion block 15 converts the rolling load change ΔP _MF into the mill elongation change ΔP _MF / M.

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

Next, the operation of the adjusting unit 9d will be described with reference to FIG.
FIG. 6 is a flowchart for explaining the operation of the rolled material thickness control apparatus according to Embodiment 1 of the present invention.

  In step S1, the adjustment unit 9d determines whether the product of the first deviation ΔH and the second deviation Δh is zero.

  If 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 gain adjustment amount ΔKp of the first setting unit 9a is set to zero. Thereafter, the operation ends.

  If 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 the positive and negative signs 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.

  If the positive and negative signs of the first deviation ΔH and the second deviation Δh are the same in step S3, the product of the first deviation ΔH and the second deviation Δh is greater than zero. In this case, the process proceeds to step S4. In step S4, the adjustment unit 9d sets the gain adjustment amount ΔKp of the first setting unit 9a to a value larger than zero. Thereafter, the operation ends.

  If the positive and negative signs 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 smaller than zero. In this case, the process proceeds to step S5. In step S5, the adjustment unit 9d sets the gain adjustment amount ΔKp of the first setting unit 9a to a value smaller than zero. Thereafter, the operation ends.

Next, simulation results of control by the plate thickness control device 9 will be described with reference to FIG.
FIG. 7 is a diagram showing a simulation result of the control by the rolled thickness control device in Embodiment 1 of the present invention.

  The uppermost diagram in FIG. 7 is a diagram showing the line speed. The line speed is the peripheral speed between the upper work roll 2 and the lower work roll 3. The second diagram from the top in FIG. 7 is a diagram showing the tension applied to the rolled material 10 on the entry side and the exit side of the rolling mill 1. 7 is a diagram showing the thickness of the rolled material 10 on the entry side and the exit side of the rolling mill 1. The lowermost diagram in FIG. 7 is a diagram showing the rolling load.

In the uppermost drawing of FIG. 7, the target value of the line speed is 100 (mpm). In the second drawing from the top in FIG. 7, the target value of the tension applied to the rolled material 10 on the entry side and the exit side of the rolling mill 1 is 100 (MPa). In the third figure from the top in FIG. 7, the average value of the actual measurement values H ^res of the thickness of the rolled material 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 of the rolling mill 1 is 17.2%.

On the entry side of the rolling mill 1, the actual measurement value H ^res of the thickness of the rolled material 10 varies. For example, the fluctuation corresponds to a sin wave. The amplitude of the fluctuation is 0.0015 (mm). The stall tension is applied to the rolled material 10 until the time T reaches 2 (s). The stall tension is set to 40% of the target value. Thereafter, the rolling of the rolled material 10 is started by increasing the line speed.

When the time T reaches 3.7 (s), the line speed reaches the target value. At this time, the plate thickness control device 9 starts to control the thickness of the rolled material 10. By this control, the actual measurement value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 is repeatedly fluctuated.

When the number of times the actual measurement value h ^res reaches the target value h _n reaches a preset number, the plate thickness control device 9 adjusts the gain of the first setting unit 9a along the flow of FIG. For example, when the number of times the actual measurement value h ^res reaches the target value h _n is 6, the plate thickness control device 9 adjusts the gain of the first setting unit 9a along the flow of FIG.

Next, the effectiveness of the control by the plate thickness controller 9 will be described with reference to FIGS. 8 and 9.
FIG. 8 is an enlarged view showing a simulation result in the case where the gain of the first setting unit is not adjusted by the adjustment unit of the rolled material thickness control apparatus according to Embodiment 1 of the present invention. FIG. 9 is an enlarged view showing a simulation result in the case where the gain of the first setting unit is adjusted by the adjusting unit of the rolled material thickness control apparatus according to Embodiment 1 of the present invention.

In FIG. 8, the actual measurement value h ^res of the thickness of the rolled material 10 on the exit side of the rolling mill 1 repeatedly fluctuates with reference to the target value h _n . Such fluctuations do not converge.

In FIG. 9, when the time T reaches 4.2 (s), the adjustment unit 9d starts adjusting 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 repeats fluctuations with the target value h _n as a reference. The fluctuation converges.

  According to Embodiment 1 demonstrated above, the gain of the 1st setting part 9a is based on the comparison result of 1st deviation (DELTA) H in the entrance side of the rolling mill 1, and 2nd deviation (DELTA) h in the exit side of the rolling mill 1. FIG. Adjusted for each sampling. As a result, the gain of the first setting unit 9a is optimized. For this reason, the precision of the thickness of the rolling material 10 in the exit side of the rolling mill 1 can be improved.

  In addition, when the positive and negative signs of the first deviation ΔH and the second deviation Δh are the same, the adjusting unit 9d increases the gain of the first setting unit 9a, and the positive and negative signs of the first deviation ΔH and the second deviation Δh. If they are different, the gain of the first setting unit 9a is reduced. For this reason, the precision of the thickness of the rolling material 10 in the exit side of the rolling mill 1 can be improved by simple control.

If the absolute value of the product of the first deviation ΔH and the second deviation Δh is smaller than a preset threshold value, the adjustment of the gain of the first setting unit 9a by the adjusting unit 9d may not be performed. In this case, the influence of the error of the estimated value h ^res due to the constant mass flow side can be removed. The influence of the measurement noise of the entrance side plate speed meter 6, the entrance side plate thickness meter 7, and the exit side plate speed meter 8 can be removed.

  As described above, the sheet thickness control device for a rolled material according to the present invention can be used in a system that increases the accuracy of the thickness of the rolled material on the exit side of the rolling mill.

DESCRIPTION OF SYMBOLS 1 Rolling machine, 2 Upper work roll, 3 Lower work roll, 4 Driving device, 5 Reduction device, 6 Entry side plate speed meter, 7 Entry side plate thickness meter, 8 Delivery side plate speed meter, 9 Plate thickness control device, 9a 1st setting Section, 9b second setting section, 9c third setting section, 9d adjustment section, 10 rolled material, 11 processing circuit, 11a processor, 11b memory, 12a feedforward AGC controller, 12b estimator, 12c mass flow AGC controller, 13 Hydraulic pressure reduction position control system, 14 first conversion block, 15 second conversion block

Claims (3)

A first setting unit for setting a first change amount of the roll gap in the rolling mill based on a first deviation between the measured value and the reference value of the thickness of the rolled material on the entry side of the rolling mill;
Of the rolling material on the exit side of the rolling mill calculated by the actual measurement value of the thickness of the rolled material on the entry side of the rolling mill and the actual measurement value of the speed on the entry side of the rolling mill and the actual measurement value of the speed of the rolling material on the exit side of the rolling mill. A second setting unit for setting a second change amount of the roll gap in the rolling mill based on a second deviation between the estimated value of the thickness and the reference value;
A third setting unit that sets an operation amount of a roll gap in the rolling mill based on the first change amount set by the first setting unit and the second change amount set by the second setting unit;
An adjustment unit that adjusts the gain of the first setting unit based on 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;
The thickness control apparatus of the rolling material provided with.   The adjustment unit increases the gain of the first setting unit when the positive and negative signs of the first deviation and the second deviation are the same, and the positive and negative signs of the first deviation and the second deviation are different. The thickness control apparatus of the rolling material of Claim 1 which makes the gain of a said 1st setting part small in the case.   The adjustment unit does not adjust the gain of the first setting unit when the absolute value of the product of the first deviation and the second deviation is smaller than a preset threshold value. The sheet thickness control apparatus of the described rolling material.

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