JP4996889B2 - Shape control method and control apparatus - Google Patents

Description

  The present invention relates to a shape control method and a control apparatus for suppressing plate shape fluctuations during acceleration / deceleration in cold rolling of a rolled material such as a metal plate.

FIG. 6 (1) is a diagram showing the relationship between rolling speed and rolling load in cold rolling of a metal plate.
In cold rolling of a metal plate, the rolled material may be accelerated or decelerated during rolling. During the acceleration / deceleration of the rolled material, the oil film thickness between the roll and the rolled material changes, and the friction coefficient between the roll and the rolled material changes with this change. As a result, as shown in FIG. 6 (1), the rolling load greatly fluctuates, resulting in a larger shape variation than that at the steady speed.

  As a method of correcting the shape of the rolled material during rolling, generally, the shape of the exit side of the rolled material is constantly monitored, and based on the shape of the exit side of the rolled material, the shape correcting actuator (WR bender, reduction leveling) , Coolant spray, etc.).

  Note that, as shown in FIG. 6 (1), since the load change is large during acceleration / deceleration of the rolled material, the shape is likely to change. However, since there is a time lag until the shape correction actuator is operated after detecting the shape of the exit side of the rolled material, this is a delay time, and it cannot cope with load fluctuations during acceleration / deceleration. There was a problem that elongation was likely to occur.

  In order to solve this problem, Patent Document 1 predicts the rolling load fluctuation amount from the speed change amount during acceleration / deceleration of the rolling speed, and responds to the predicted load fluctuation amount simultaneously with the acceleration / deceleration speed change. A method of correcting the plate thickness at the time of acceleration / deceleration with high accuracy by controlling the reduction device is disclosed. Similarly, the shape at the time of acceleration / deceleration can be corrected with high accuracy by controlling the shape correcting actuator.

  FIG. 6 (2) is a diagram showing the relationship between the speed of the rolled material and the exit tension of the rolled material at the time of rolling reduction during cold rolling of the metal plate.

  By the way, when winding the coil during rolling up to the end of the coil with the same tension as that of the rolling steady part, after the tension is released, rewinding may occur due to residual stress, and scratches may occur.

  In order to prevent such spring back, when the end of winding is approaching, control for reducing the winding tension is executed (exit side tension taper control). That is, as shown in FIG. 6 (2), a method of gradually reducing the winding tension at the time of rolling reduction is performed to prevent rewinding. However, the fluctuation in the entry / exit side tension affects the rolling load, and when the winding tension is lowered, the load increases due to the decrease in tension.

  For this reason, when the rolled material is decelerated, a load change that combines the load change corresponding to the speed change and the load change corresponding to the tension change occurs, so that the load change is further increased and the shape is likely to change greatly.

  According to the technique described in Patent Document 1, it is possible to realize shape correction with high accuracy by load prediction for speed change, but it cannot cope with load fluctuation due to tension change. For this reason, when lowering the winding tension at the time of deceleration (during taper control), it is important to reduce the cause of shape defects and rolling troubles by taking into account the increase in load due to the decrease in tension, and suppressing shape ear elongation. Become.

  Therefore, during taper control during deceleration, an operator often manually operates the WR bender by monitoring the shape of the rolled material. However, when the WR bender operation is performed manually, there is a problem that operation delays and variations in operations by operators occur, and it is impossible to efficiently suppress the cause of shape defects and rolling troubles.

JP-A-9-201609

  The present invention has been made in consideration of these circumstances, and shape control capable of efficiently suppressing the occurrence of shape defects and rolling troubles during outlet side taper control in cold rolling of a rolled material. It is an object to provide a method and a control device.

ΔＰ２＝Ｐ０−Ｐ−ΔＰ _ｐ ……（式２）
ただし、ΔＰ２は速度変化要因以外の荷重変動、Ｐ０は張力下げ開始時の圧延荷重値、Ｐは実荷重、ΔＰ _ｐ は加減速時の荷重変化予測量である。

ＷＲベンダー制御量＝（フィードバック形状制御分）＋（加減速補償制御分）＋（張力下げ制御補償分）＋（手動操作分）…（式３）

（式４）の「Ｓ」は一般的なフィードバック制御における積分項を示し、（式４）の「Σ」は各時点での制御量の和を示す。
また、加減速補償制御分のうち、「クラウン変化に対するＷＲＢ変化量」と「荷重変化に対するクラウン変化量」はモデル式や実験式により求める。ΔＰ_Ｐは、加減速時の一定時間毎（例えば５０ｍｓ毎）の荷重変化予測量（式１）を使用する。
In order to solve the above-mentioned problems, the following technical measures are taken in the present invention.
The present invention relates to a rolling material shape control method for correcting the shape of a rolled material by controlling the shape correcting means when accelerating or decelerating the rolling speed when cold rolling the rolled material. The first step of calculating the control amount of the shape correcting means using (Equation 4), and the second step of calculating the predicted change amount of the rolling load using (Equation 1) based on the change amount of the rolling speed. And lowering of the tension during taper control of the winding tension based on the rolling load at the start of lowering the winding tension, the current rolling load, and the predicted change amount of the rolling load calculated in the second step. The third step of calculating the load fluctuation amount caused by (Equation 2), the control amount calculated in the first step, the predicted change in rolling load calculated in the second step, and the third step Based on the load fluctuation calculated in the process, use (Equation 3) And a fourth step of calculating a control amount of the shape correcting means .

ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.

WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

“S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.
In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. [Delta] P _P uses a load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1).

Further, the present invention provides a rolling material shape control method for correcting the shape of a rolled material by controlling the shape correcting means during acceleration / deceleration of the rolling speed when the rolled material is cold-rolled. Of the tension during the taper control of the winding tension based on the rolling load at, the current rolling load, and the predicted amount of change in rolling load calculated using (Equation 1) based on the amount of change in rolling speed. The load fluctuation amount resulting from the lowering is calculated using (Equation 2), and the control amount of the shape correcting means is calculated using (Equation 3) using the calculated load fluctuation amount.

Further, the present invention provides a rolling mill control device for controlling the shape correcting means during cold rolling of a rolled material to control the shape correcting means during acceleration / deceleration of the rolling speed. A shape detecting means for detecting, a control amount calculating means for calculating a control amount of the shape correcting means based on the detected shape of the rolled material on the outgoing side using (Equation 4), and a rolling speed for detecting a rolling speed. Based on the detection means, the change amount of the detected rolling speed, a change prediction amount calculation means for calculating a change prediction amount of the rolling load using (Equation 1), a rolling load detection means for detecting the rolling load, Based on the storage means for storing the rolling load at the start of lowering the winding tension, the rolling load stored in the storage means, the detected current rolling load, and the calculated predicted change amount of the rolling load. Taper control of winding tension The load variation calculating means for calculating using the equation (2) load variation amount due to lowering of the tension in the medium, and a control amount of the control amount calculating means is calculated, the change in the predicted amount calculation means has calculated Control means for calculating a control amount of the shape correcting means using (Equation 3) based on a predicted change amount of rolling load and a load fluctuation amount calculated by the load fluctuation amount calculating means. Features.
In addition, the present invention provides a rolling speed detection for detecting a rolling speed in a control device of a rolling mill that controls the shape correcting means during cold rolling of the rolled material to control the shape correcting means during acceleration / deceleration of the rolling speed. A change prediction amount calculation means for calculating a rolling load change prediction amount using (Equation 1) based on the detected rolling speed change amount, a rolling load detection means for detecting the rolling load, Based on the storage means for storing the rolling load at the start of lowering the take-up tension, the rolling load stored in the storage means, the detected current rolling load, and the calculated predicted change amount of the rolling load The load fluctuation amount calculating means for calculating the load fluctuation amount resulting from the decrease in the tension during taper control of the winding tension using (Equation 2), and using the calculated load fluctuation amount, (Equation 3) Using the shape Control means for calculating a control amount of the correction means .

When calculating the control amount of the shape correcting means, the control amount is calculated using a value obtained by multiplying the value of the load fluctuation amount resulting from the decrease in tension by the control gain Gt.
Further, the control gain Gt is determined based on the shape of the rolled material. Examples of the shape of the rolled material include a plate width and a plate thickness.
Further, the shape control method can be executed by a computer of a rolling mill.

According to the present invention, it is possible to suppress the shape variation caused by the load variation due to the speed variation, and to appropriately operate the shape correction actuator against the shape variation caused by the load variation due to the tension variation. The shape quality can be improved. In addition, it is possible to reduce rolling troubles due to shape defects during acceleration / deceleration and improve productivity.
In addition, there is an effect that it is possible to efficiently suppress the occurrence of shape defects and rolling troubles during the outlet side tension taper control in the cold rolling of the rolled material.

  Hereinafter, a control device and a shape control method according to embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram illustrating an outline of a rolling mill 100 including a control device according to an embodiment of the present invention.

  The rolling mill 100 is a rolling facility capable of carrying out the present invention, and includes a controller (not shown), a pulse generator (not shown), a shape sensor 10, a load meter 11, a shape control device 12, and a load. Change prediction unit 13, load fluctuation calculation unit 14, WR bender control device 15, reduction control device 16, coolant spray control device 17, reduction device 18, WR bender device 19, coolant spray device 20, A pair of upper and lower work rolls 21a and 21b, a pair of upper and lower intermediate rolls 22a and 22b, a pair of upper and lower auxiliary rolls 23a and 23b, an unwinding machine 24, and a winder 25 are provided.

  The rolling mill 100 is a rolling mill that rolls a rolled material W guided between a pair of work rolls 21a and 21b opposed to each other at a predetermined pressure. The reduction device 18, the WR bender device 19, and the coolant spray device 20 constitute a shape correction actuator.

  A controller (not shown) is a controller that incorporates a ROM that stores a control program and a load memory that records rolling load values, and controls the entire control device according to the control program. Further, the controller outputs a speed command for the next control cycle and outputs a winding tension lowering start command according to the control program.

  A pulse generator (not shown) detects the rotation speed of the motor that drives the work roll 21a. Based on the number of rotations detected by the pulse generator and the diameter of the work roll 21a, the controller obtains the actual rolling speed value.

  The shape sensor 10 is a shape detector provided on the exit side of the rolling mill 100, measures the elongation ε of each part in the width direction of the rolled material W after rolling, and information on the measured elongation ε (actual value) ) Is output to the shape control device 12.

  The load meter 11 is a load meter that is attached to the auxiliary roll 23a and measures a rolling load applied to the rolled material W. During rolling of the rolled material W, the rolling load is constantly monitored, and information on the measured rolling load is loaded. It outputs to the change prediction part 13 and the load fluctuation calculation part 14.

  The shape control device 12 is a control device that performs feedback control for operating the shape correction actuator based on the shape of the rolled material W detected on the exit side of the rolling mill 100. Specifically, the shape control device 12 inputs the actual value detected by the shape sensor 10, calculates a deviation between the input actual value and the target shape, and based on the calculated deviation, The control amounts of the reduction control device 16 and the coolant spray control device 17 are calculated, and a control signal corresponding to the calculated control amount is output.

The load change prediction unit 13 calculates the speed change ΔV from the speed command of the next control cycle received from the controller and the actual value of the rolling speed, and at the time of acceleration / deceleration using the following load change prediction formula (Formula 1). of calculating a load change predicted amount [Delta] p _p, and outputs a control signal corresponding to the calculated load change predicted amount [Delta] p _p to WR vendor control device 15.

Further, P is a rolling load, ΔP _p is a minute rolling load change amount (a predicted load change amount during acceleration / deceleration), V is a rolling speed measured based on a pulse generator, and ΔV is a minute speed change amount.

  When the start of lowering the take-up tension is instructed from the controller, the load fluctuation calculating unit 14 records the load P0 at the start of lowering the take-up tension in the load memory. Accordingly, the load fluctuation amount ΔP2 other than the speed change factor is calculated, and a control signal corresponding to the calculated load fluctuation amount ΔP2 other than the speed change factor is output to the WR bender controller 15. In other words, the load fluctuation amount ΔP2 other than the speed change factor is the load fluctuation amount resulting from the decrease in the tension during taper control of the winding tension.

ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.

  In accordance with the following (Equation 3), the WR bender control device 15 adds “WRB change amount to crown change” to the control amount output by the shape control device 12 (feedback shape control amount) and the control amount output from the load change prediction unit 13. ”And“ crown change amount with respect to load change ”(acceleration / deceleration compensation control amount), and a value obtained by multiplying the control amount output by the load fluctuation calculation unit 14 by the control gain Gt (tension reduction control compensation amount) And the WR vendor control amount of the WR vendor device 19 is determined based on the total control amount. When there is a control amount for manual operation, a control amount obtained by summing values for manual operation is used.

  WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

  Note that “S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.

In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. Incidentally, [Delta] P _P uses load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1).

FIG. 2 is a graph showing a function for determining the control gain Gt.
The degree of influence of load variation on the shape varies depending on the sheet width and thickness of the rolled material. For this reason, without setting the control gain Gt to a constant value, for example, as shown in FIG. 2, the control gain Gt is determined according to the sheet width of the rolled material.

  The WR bender device 19 is disposed at both ends of the shafts of the work rolls 21a and 21b and the intermediate rolls 22a and 22b, and changes the bending amount of each roll based on a control signal from the WR bender control device 15, It is an apparatus for bending the shape of the rolled material W by bending the axis of each roll into a convex shape or a concave shape with respect to the rolled material W.

  The reduction control device 16 controls the reduction device 18 based on the control signal output from the shape control device 12.

  The coolant spray control device 17 controls the coolant spray device 20 based on the control signal output from the shape control device 12.

  The reduction device 18 is a reduction device that is disposed below the roll axis of the auxiliary roll 23 b and applies a rolling load to the auxiliary roll 23 b under the control of the reduction control device 16.

  The coolant spray device 20 injects a predetermined amount of coolant toward the work rolls 21 a and 21 b under the control of the coolant spray control device 17.

  The work rolls 21a and 21b are work rolls that are rolled with the rolled material W sandwiched between them, and the rolled material W has a desired product thickness on the exit side of the rolling mill 100.

  The auxiliary rolls 23a and 23b are backup rolls that apply a rolling load to the work rolls 21a and 21b via the intermediate rolls 22a and 22b.

  The unwinder 24 is an unwinder that supplies the rolled material W to the work rolls 21a and 21b, and the winder 25 is a winder that winds the rolled material W rolled by the work rolls 21a and 21b. .

Next, the control operation of the rolling mill 100 will be described.
FIG. 3 is a flowchart showing the operation of the control device.

  When the rolling mill 100 is performing cold rolling of the rolled material, it is determined whether or not the WR bender control condition is satisfied (S1), and if not, the process loops until it is satisfied (S1). ). The case where the WR bender control condition is satisfied is a state where the rolling mode is on, the rolling load is present, and the rolled material is present.

  When the WR bender control condition is satisfied (S1), the shape control device 12 calculates a deviation between the actual value (S2) of the outgoing shape detected by the shape sensor 10 and the target shape (S3). Based on the deviation, the value (WRB_afc) for the feedback shape control is calculated using (Equation 4) (S4).

Subsequently, the rolling speed is constantly monitored to determine whether or not the rolling speed has changed (S5). If there is a change in the rolling speed, the above (Formula 1) calculates a load change predicted amount [Delta] P _P at the time of acceleration or deceleration using the (S6), acceleration and deceleration compensation control using the above Equation (5) The minute value (WRB_a) is calculated (S7). If there is no change in the rolling speed, the process proceeds to step S8.

  Subsequently, it is determined whether or not the lowering of the winding tension has been started (S8). When the lowering of the winding tension is started, the load P0 at the start of the lowering of the winding tension is recorded in the load memory (S9), and the load fluctuation amount other than the speed change factor using the above (Equation 2). ΔP2 is calculated (S10), and the value (WRB_t) for tension reduction control compensation is calculated using (Equation 6) (S11). If there is no instruction to start lowering the winding tension, the process proceeds to step S12.

  Subsequently, it is determined whether or not there has been a manual operation by the operator (S12). If there is a manual operation, a WR vendor control amount (WRB_m) by manual operation is calculated (S13).

  Subsequently, using (Equation 3), the total value of each value obtained in step S4, step S7, step S11, and step S13 is calculated (S14), and the control of the WR vendor device 19 is performed based on the calculated control amount. Execute. That is, for the control in the state of rolling acceleration / deceleration and the winding tension being lowered, the control amount obtained using (Equation 3) is used.

  Subsequently, it is determined whether or not the stop of the rolling operation has been instructed (S15). If the stop of the rolling operation has not been instructed, the process proceeds to step S2, and the operations of steps S2 to S14 are executed. If the stop of the rolling operation is instructed, the control operation is terminated.

FIG. 4 is a diagram illustrating various data during deceleration when the conventional method is applied.
4 (1) is a graph showing changes in rolling speed, FIG. 4 (2) is a graph showing changes in rolling load, and FIG. 4 (3) is a graph showing changes in bender amount. (4) is a graph showing a change in winding tension, and FIG. 4 (5) is a graph showing a change in shape evaluation. Note that the shape evaluation shown in FIG. 4 (5) is a shape evaluation indicating the amount of shape elongation of the edge portion, and a larger value indicates an elongated shape.

  When the conventional method is applied, as shown in FIG. 4, the shape is stable because the load change prediction due to the speed change is used until the winding tension starts to decrease after the rolling speed is reduced. However, when the winding tension starts to decrease, it greatly fluctuates in the elongation direction. That is, the shape of the rolled material changes greatly.

FIG. 5 is a diagram showing various data during deceleration when the present invention is applied.
Each of FIGS. 5 (1) to 5 (5) corresponds to FIGS. 4 (1) to 4 (5).
When the present invention is applied, as shown in FIG. 5, when the winding tension starts to decrease after the rolling speed is reduced, the WR bender operation corresponding to the load fluctuation due to the tension change is added, so the operation amount is larger than the conventional method. It becomes large and the shape change of a rolling material can be made small.

  According to the present embodiment, it is possible to suppress the shape fluctuation caused by the load fluctuation due to the speed change and to appropriately operate the shape correction actuator against the shape fluctuation caused by the load fluctuation due to the tension change. The shape quality during deceleration can be improved. Moreover, the rolling trouble by the shape defect at the time of acceleration / deceleration can be reduced, and productivity can be improved. In addition, it is possible to efficiently suppress the occurrence of shape defects and rolling troubles during the outlet side tension taper control in the cold rolling of the rolled material.

  In the present embodiment, the WR bender device 19 is controlled based on the control amount obtained in step S14. The coolant spray device 20 is controlled together with the WR bender device 19 based on the control amount. It may be. Further, at least one of the WR bender device 19 and the coolant spray device 20 may be controlled based on the control amount obtained in step S14.

Each of the above embodiments can be understood as a program invention.
That is, the present invention is realized by storing a program related to the control operation described in each of the above embodiments in a storage medium, reading the program from the storage medium, and causing the computer of the rolling mill to execute the read program. be able to.

  The present invention can be applied to a multi-stage rolling mill that cold-rolls a workpiece (rolled material) such as aluminum and a control program for controlling the rolling mill.

The schematic block diagram which shows the outline of the rolling mill 100. FIG. The graph which shows the function for determining control gain Gt. The flowchart which shows operation | movement of a control apparatus. The figure which shows the various data at the time of deceleration in the case of applying the conventional method. The figure which shows the various data at the time of deceleration at the time of applying this invention. The figure which shows the relationship between the rolling speed and rolling load in cold rolling of a metal plate, and the rolling speed and tension.

Explanation of symbols

100 ... rolling mill,
10 …… Shape sensor,
11 …… Load meter,
12 ... Shape control device,
13 …… Load change prediction section,
14 …… Load fluctuation calculation part,
15 …… WR vendor control device,
16: Reduction control device,
17 ... Coolant spray control device,
18 ... reduction device,
19 …… WR vendor equipment,
20 ... Coolant spray device,
21a, 21b ... work rolls,
22a, 22b ... intermediate roll,
23a, 23b ... auxiliary roll,
24 .. Unwinder,
25: Winder.

Claims (4)

In the cold rolling of the rolled material, in the shape control method of the rolled material to correct the shape of the rolled material by controlling the shape correcting means at the acceleration and deceleration of the rolling speed,
A first step of calculating a control amount of the shape correcting means based on the shape of the rolled material on the delivery side using (Equation 4) ;
A second step of calculating a rolling load change prediction amount using (Equation 1) based on the amount of change in rolling speed;
Based on the rolling load at the start of lowering the winding tension, the current rolling load, and the predicted amount of change in rolling load calculated in the second step, due to the decrease in the tension during taper control of the winding tension A third step of calculating the load fluctuation amount to be calculated using (Equation 2) ;
Based on the control amount calculated in the first step, the rolling load change prediction amount calculated in the second step, and the load fluctuation amount calculated in the third step, the shape is calculated using (Equation 3). A fourth step of calculating the control amount of the correcting means ;
A shape control method characterized by comprising:

P is a rolling load, ΔP _p is a minute rolling load change amount (a predicted load change amount during acceleration / deceleration), V is a rolling speed measured based on a pulse generator, and ΔV is a minute speed change amount. ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.

WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

“S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.
In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. [Delta] P _P uses a load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1). In the cold rolling of the rolled material, in the shape control method of the rolled material to correct the shape of the rolled material by controlling the shape correcting means at the acceleration and deceleration of the rolling speed,
Based on the rolling load at the start of lowering the winding tension, the current rolling load, and the predicted change in rolling load calculated using (Equation 1) based on the amount of change in rolling speed, The load fluctuation amount resulting from the decrease in the tension during the taper control is calculated using (Equation 2), and the control amount of the shape correcting means is calculated using (Equation 3) using the calculated load fluctuation amount. A shape control method characterized by the above.

P is a rolling load, ΔP _p is a minute rolling load change amount (a predicted load change amount during acceleration / deceleration), V is a rolling speed measured based on a pulse generator, and ΔV is a minute speed change amount. ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.

WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

“S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.
In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. [Delta] P _P uses a load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1). In cold rolling a rolled material, in the control device of the rolling mill for correcting the shape of the rolled material by controlling the shape correcting means at the acceleration and deceleration of the rolling speed,
Shape detecting means for detecting the shape of the rolled material on the delivery side;
A control amount calculating means for calculating a control amount of the shape correcting means based on the detected shape of the rolled material on the outlet side using (Equation 4) ;
Rolling speed detecting means for detecting the rolling speed;
Based on the detected change amount of the rolling speed, a change prediction amount calculation means for calculating a change prediction amount of the rolling load using (Equation 1) ;
Rolling load detection means for detecting the rolling load;
Storage means for storing the rolling load at the start of lowering the winding tension;
Based on the rolling load stored in the storage means, the detected current rolling load, and the calculated predicted amount of change in the rolling load, this is due to a decrease in the tension during taper control of the winding tension. Load fluctuation amount calculating means for calculating the load fluctuation amount using (Equation 2) ;
Based on the control amount calculated by the control amount calculation means, the rolling load change prediction amount calculated by the change prediction amount calculation means, and the load fluctuation amount calculated by the load fluctuation amount calculation means, (Equation 3) Control means for calculating a control amount of the shape correction means using
A rolling mill control device characterized by comprising:

P is a rolling load, ΔP _p is a minute rolling load change amount (a predicted load change amount during acceleration / deceleration), V is a rolling speed measured based on a pulse generator, and ΔV is a minute speed change amount. ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.

WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

“S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.
In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. [Delta] P _P uses a load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1).
In cold rolling a rolled material, in the control device of the rolling mill for correcting the shape of the rolled material by controlling the shape correcting means at the acceleration and deceleration of the rolling speed,
Rolling speed detecting means for detecting the rolling speed;
Based on the detected change amount of the rolling speed, a change prediction amount calculation means for calculating a change prediction amount of the rolling load using (Equation 1) ;
Rolling load detection means for detecting the rolling load;
Storage means for storing the rolling load at the start of lowering the winding tension;
Based on the rolling load stored in the storage means, the detected current rolling load, and the calculated predicted amount of change in the rolling load, this is due to a decrease in the tension during taper control of the winding tension. Load fluctuation amount calculating means for calculating the load fluctuation amount using (Equation 2) ;
Control means for calculating a control amount of the shape correcting means using (Equation 3) using the calculated load fluctuation amount;
A rolling mill control device characterized by comprising:

P is a rolling load, ΔP _p is a minute rolling load change amount (a predicted load change amount during acceleration / deceleration), V is a rolling speed measured based on a pulse generator, and ΔV is a minute speed change amount. ΔP2 = P0−P−ΔP _p (Expression 2)
However, [Delta] P2 is the load fluctuation of the other speed change factor, P0 is rolling load value at the start of the tension lowering, P is the actual load, [Delta] P _p is the load change predictor during acceleration or deceleration.
WR bender control amount = (feedback shape control amount) + (acceleration / deceleration compensation control amount) + (tension reduction control compensation amount) + (manual operation amount) (Equation 3)

“S” in (Expression 4) indicates an integral term in general feedback control, and “Σ” in (Expression 4) indicates the sum of control amounts at each time point.
In addition, among the acceleration / deceleration compensation control, “WRB change amount with respect to crown change” and “crown change amount with respect to load change” are obtained by a model formula or an experimental formula. [Delta] P _P uses a load variation predicted amount for each predetermined time during acceleration or deceleration (e.g. 50ms per) (Equation 1).

Images