JP2008142728A - Rolling mill controller, rolling mill control system and rolling mill controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the phenomenon that the tension control and sheet thickness control in respective rolling mill stands are interfered through a successive function, and control accuracy is deteriorated. <P>SOLUTION: The rolling mill controller is provided with: successive operational equipment 41 for performing a successive movement to operate in such a manner that the change in the velocity on the upstream side of a rolling mill stand 1 operating velocity or on the inlet side of a tandem rolling mill and the change in the velocity on the downstream side of the rolling mill stand 1 operating velocity or on the outlet side of the tandem rolling mill are made the same ratio; and a successive function gain regulating apparatus 42 regulatable in such a manner that the gain of a successive operation to the successive operational equipment 41 is changed in accordance with the rolling state of the material 5 to be rolled. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling mill control device, a rolling mill control system, and a rolling mill control method for performing plate thickness control or tension control in a tandem rolling mill by operating the speed of a rolling mill stand.

In the tandem rolling mill, when performing plate thickness control and tension control, it is necessary to appropriately control the speed of each rolling mill stand.
For example, the two-stand tandem rolling mill shown in FIG. 2 includes a # 1 stand rolling mill 1 and a # 2 stand rolling mill 2, an entry side bridle roll 3 as the rolling mill entry side equipment, and an exit side as the rolling mill exit side equipment. It consists of a bridle roll 4.

  The # 1 stand reduction control device 21 and the # 2 stand reduction control device 22 control the roll interval of each rolling mill stand and adjust the rolling pressure applied to the material 5 to be rolled. A # 1 stand speed control device 23, a # 2 stand speed control device 24, and an entry side bridle roll speed control device 25 control the plate speed of the material to be rolled 5, and adjust the tension.

  Here, it is assumed that the inter-stand tension control device 32 is operated and the speed of the # 1 stand rolling mill 1 is changed. Since the control output changes the speed of the # 1 stand rolling mill 1, the entry side tension changes as it is. Therefore, a function is required in which the control output is also output to the entry-side bridle roll so that the speed of the entry-side bridle roll 3 matches the speed of the # 1 stand rolling mill 1 so that tension fluctuation does not occur. This is performed by the successive function 40 of FIG. 2 (see Patent Documents 1 and 2).

The successive function 40 has various means as described in Patent Documents 1 and 2, but is a function generally used in a tandem rolling mill.
Here, it is assumed that the advance rate and the reverse rate that determine the rolling mill outlet side speed and the inlet side speed in the mass flow type of FIG. 3A are constant. The advance rate and the reverse rate vary little if not constant during rolling, and as negligible, the fluctuation of tension at the time of rolling mill speed operation using the successive function 40, and the mass flow fluctuation on the entrance and exit side of the rolling mill stand. The plate thickness variation caused by this was prevented.

  However, when the fluctuations in the advance rate and the reverse rate are large beyond a negligible level, using the successive function 40 may cause disturbance to the tension and the plate thickness. In particular, the advance rate and the reverse rate change caused by the change of the neutral point during rolling are greatly affected. The successive function 40 interferes with the # 1 stand plate thickness control 31, the inter-stand tension control 32, and the entry side tension control 33. However, there may be a vibration phenomenon of plate thickness or tension.

FIG. 8 shows a test result in a 2-stand tandem rolling mill with a successive function. The plate thickness control 31, the inter-stand tension control 32, and the entry side tension control 33 interfere with each other through the successive function 40, and the plate thickness is reduced. It is vibrating. That is, the tension difference between the inter-stand tension 84 and the entry-side tension 85 shown in FIG. 8D is large, and the thickness of the exit side of the # 1 stand rolling mill 1 shown in FIG. 8B varies greatly.
In addition, a technique has been proposed in which the control gain of a sheet thickness control or tension control system in a tandem rolling mill is changed according to the rolling state (see Patent Document 3).

Patent 27978872 Patent 3234431 JP 2001-71010 A

  As described above, when the successive function 40 is always operated as in the techniques described in Patent Documents 1 and 2, when the advance rate and the reverse rate change are large, the successor function 40 can be used instead. There was an inconvenience that it was a disturbance to the plate thickness.

  Further, the control gain of the plate thickness control or tension control system in the tandem rolling mill according to the technique described in Patent Document 3 is the plate thickness, inter-stand tension while suppressing the mutual interference of the plate thickness, inter-stand tension and looper angle. Since the looper angle follows the target value, it is different from the gain of the successive function 40, and the disturbance to the tension and the plate thickness due to the use of the successive function 40 cannot be solved.

  Accordingly, an object of the present invention is to provide tension fluctuations caused by interference between sheet thickness control and tension control applied to each rolling mill stand due to operation of the successive function when neutral point fluctuations in rolling are large. It is to suppress the plate thickness fluctuation.

  In order to solve the above-mentioned problems and achieve the object of the present invention, the rolling mill control device of the present invention changes the speed of each rolling mill stand of the plurality of rolling mill stands by controlling the thickness or tension of the material to be rolled. Changes in the speed on the upstream side of the rolling mill stand that operates the speed or the entrance side of the tandem rolling mill, and the downstream side of the rolling mill stand that controls the speed or the exit side of the tandem rolling mill It can be adjusted to change the gain of the successive operation for the successive computing device according to the rolling state of the material to be rolled, and the successive computing device that performs the successive operation to manipulate the change in the speed of the material to the same ratio And a successive function gain adjusting device.

  The rolling mill control system of the present invention functions to change the speed of each rolling mill stand of a plurality of rolling mill stands, and controls the thickness of the material to be rolled or tension control. Change the speed of the upstream side of the rolling mill stand and the inlet side of the tandem rolling mill or change the speed of the downstream side of the rolling mill stand and the speed of the outlet side of the tandem rolling mill to the same ratio. And a succession function gain adjustment device that can be adjusted to change the gain of the succession operation for the succession operation device according to the rolling state of the material to be rolled.

Further, the rolling mill control method of the present invention is a function for changing the speed of each rolling mill stand of the rolling mill stand for controlling the thickness or tension of the material to be rolled, and the rolling mill for operating the speed. For operating the speed change on the upstream side of the stand and the inlet side of the tandem rolling mill or the speed change on the downstream side of the rolling mill stand for controlling the speed and the speed change on the outlet side of the tandem rolling mill so as to have the same ratio. The method includes a successive operation step for performing a successful operation, and a successive function gain adjustment step that can be adjusted so as to change the gain of the successful operation for the successive operation device in accordance with the rolling state of the material to be rolled.
Thereby, according to a rolling state, a successful function can be operated so that it may not become disturbance with respect to tension | tensile_strength or board thickness.

  By applying the present invention, when neutral point fluctuations occur during acceleration / deceleration of the rolling mill, it becomes possible to minimize fluctuations in plate thickness and tension caused by the successive function, and to achieve high accuracy and stability. It is possible to perform rolling mill control such as sheet thickness control and tension control.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
First, Embodiment 1 will be described.
FIG. 2 shows the simplest two-stand tandem rolling mill. In the present embodiment, hereinafter, a two-stand tandem rolling mill is used as an embodiment. The tandem rolling mill includes a # 1 stand rolling mill 1 and a # 2 stand rolling mill 2, an entry side bridle roll 3 as a rolling mill entry side equipment, and an exit side bridle roll 4 as a rolling mill exit side equipment.

  The # 1 stand reduction control device 21 and the # 2 stand reduction control device 22 control the roll interval of each rolling mill stand and adjust the rolling pressure applied to the material 5 to be rolled. A # 1 stand speed control device 23, a # 2 stand speed control device 24, and an entry side bridle roll speed control device 25 control the plate speed of the material to be rolled 5, and adjust the tension.

  In rolling, the rolling material 5 is adjusted to a predetermined thickness by adjusting the rolling pressure and tension applied to the rolling material 5. For that purpose, # 1 stand exit side thickness meter 11 and # 2 stand exit side thickness meter 12 that measure the thickness of the material 5 to be rolled, and the entrance side tension meter 13 that measures the tension in each section, between the stands A tension 14 meter is installed.

  Using the signal from the # 1 stand exit side thickness gauge 11, the exit thickness of the # 1 stand rolling mill 1 is controlled by the thickness control unit 31 that controls the rolling pressure of the # 1 stunt rolling mill 1 by the # 1 stand reduction control device 21. Is controlled. Further, the inter-stand tension is controlled by an inter-stand tension control 32 that operates the speed of the # 1 stand rolling mill 1 by the # 1 stand speed control device 23 using the output of the inter-stand tension meter 14.

Similarly, the entry-side tension of the # 1 stand rolling mill 1 is determined by an entry-side tension control 33 that operates the entry-side bridle roll 3 speed by the entry-side bridle roll speed control device 25 using the output of the entry-side tension meter 13. Be controlled.
In addition to this, various detectors are installed in the two-stand tandem rolling mill and various controls are applied, but they are omitted because they are not related to the description of the present embodiment.

FIG. 3 shows a basic formula of rolling. A mass flow formula of H · V _e = h · V _o shown in FIG. 3A is established between the thickness and speed on the entry side and the exit side of the rolling mill. Also, between the # 1 stand rolling mill 1 and the # 2 stand rolling mill 2, or between the entry-side bridle roll 3 and the # 1 stand rolling mill 1, and between the # 2 stand exit-side rolling mill 2 and the exit-side bridle roll 4. Is a tension formula relationship of T = S / L∫ (V _ei -V _oi-1 ) shown in FIG. 3B.

FIG. 4 shows the speed during rolling. FIG. 4A shows the relationship between the rolling speeds of the respective rolling mill stands and entry / exit facilities during steady rolling (a state where the plate thickness and tension are constant values). Focusing on the entry side tension of the # 1 stand rolling mill 1, as shown in 51, in order to make the entry side tension constant, the entry side speed V _e1 and the entry side bridle roll speed V of the # 1 stand rolling mill 1 are used. _EBR needs to be the same speed.
FIG. 4B shows the relationship between the rolling speed of each rolling mill stand and the entry / exit side equipment when the speed of the # 1 stand rolling mill 1 is changed.

  Here, it is assumed that the inter-stand tension control device 32 is operated and the speed of the # 1 stand rolling mill 1 is changed. As shown at 52, the control output (1 + ΔV / V) of the inter-stand tension control device 32 changes the speed of the # 1 stand rolling mill 1, so that the entry-side tension changes as it is.

Therefore, the control output (1 + ΔV / V) of the inter-stand tension control device 32 is also output to the entry-side bridle roll 3, and as shown at 53, the speed of the entry-side bridle roll 3 is also determined by V _EBR · (1+ ΔV / V), a function is required in which the rate of change in the speed of the entry-side bridle roll 3 and the rate of change in the speed of the # 1 stand rolling mill 1 are matched to prevent tension fluctuations. It is the successive function 40 of FIG. 2 that does this.

FIG. 5 shows the relationship between the neutral point in rolling, the advance rate, and the reverse rate. Rolling is performed by passing the material to be rolled 5 between the upper work roll 101 and the lower work roll 102. At that time, slip occurs between the material to be rolled 5 and the upper and lower work rolls 101 and 102, and one neutral point where the roll speed and the speed of the material to be rolled 5 coincide with each other is in the region where the roll and the material to be rolled are in contact with each other. appear. Speed at touch start point of the work rolls and the material to be rolled becomes the entry side speed V _e.

Further, the speed at the contact end point of the work roll and the material to be rolled becomes the _delivery side speed Vo. Forward slip f is the one from the ratio of the exit-side velocity _{V o} neutral point velocity _{V R (V o / V R} ) obtained by subtracting the reverse rate b is 1 than the entering-side velocity _{V e} and the neutral point velocity V _R ratio (V _e / V _R ) is subtracted.

For example, entry side thickness H becomes thick, the entering-side velocity _{V e} is small, the ratio of the inlet-side velocity _{V e} and the exit-side speed _{V o} such exit-side velocity _{V o} increases _(V e / _{V o)} is changed In this case, the successive function 40 should be activated.

The case where only the position of the neutral point changes while the ratio (V _e / V _o ) between the input side speed V _e and the output side speed V _o remains constant is the case mentioned in the problem. In this case, according to the change of the neutral point position, although roll speed V _R should there be changed, whereby for entry-side velocity V _e is kept constant, the inlet side bridle roll 3 with Sakusesshibu function 40 The speed should not change.

For example, in FIG. 5, if the neutral point position changes from the neutral point A to the neutral point B, the advance rate f decreases and the reverse rate b increases. Accordingly, the exit-side speed _{V o} becomes smaller _{as V e = (1-b)} · V R shown in FIG. 3, the greater the exit side tension _{T f.} In addition, the entry-side speed V _e is also reduced, and the entry-side tension T _b is reduced. If the neutral point position is changed to the neutral point A from the neutral point B in the reverse, contrary to egress tension T _f is reduced, the entry side tension T _b increases. That is, the entry side tension T _b and the exit side tension T _f change in opposite phases.

In the case of fluctuations in the plate thickness, generally, the entry side velocity V _e and the exit side velocity V _o change in the reverse method by the action of the plate thickness control 31, and the entry side tension T _b and the exit side tension T _f are changed. Change in phase.
Therefore, it can be determined whether the change in the neutral point position or the variation in the plate thickness is caused by whether the change in the entry side tension T _b and the exit side tension T _f of the rolling mill stand is the same phase or the opposite phase.

May roll speed V _R is changed, the entry side tension T _b, although the delivery side tension T _f is changed in phase opposition, it is better this not operated Sakusesshibu function 40 also. The modification of the roll speed V _R, the entry side tension T _b, can be controlled exit side tension T _f is the time both jointly from a state in which entry side tension T _b is not corrected by operating the Sakusesshibu function 40 in the opposite It is.

  In order to realize the above, as shown in FIG. 1, the entrance side tension meter 13 and the inter-stand tension meter 14 on the entrance side of the # 1 stand rolling mill 1 and the exit side tension are used to succeed. A successive function gain adjustment device 42 that determines how much the function 40 is used is provided, and thereby the gain of the successive operation device 41 is adjusted.

  FIG. 6 shows the details of the successive function gain adjusting device 42. Here, the gain SG of the successive function 40 is obtained using fuzzy reasoning. In fuzzy inference, a numerical quantity is converted into a certainty factor that is a qualitative concept, and the certainty factor is used to infer in IF-THEN format using an inference rule, and the certainty factor for the qualitative concept is output as a result.

First, as input # 1 entry side tension T _b and outgoing side tension T _f of the stand rolling mill 1, by performing time differentiation by time differentiator 421, the inlet side tension change direction and exit-side necessary inference rules Numerical amounts dTB and dTF for obtaining the tension change direction are calculated.

  The result is input to a membership function 422 for converting a numerical quantity into a certainty factor, and the membership function 422 set in advance indicates a degree TBD in which the entry side tension is decreasing, and the entry side tension is in an increasing direction. The degree of TBF, the degree TFD in which the outgoing side tension is in a decreasing direction, and the degree of confidence in the qualitative concept of the degree TFF in which the outgoing side tension tends to increase are converted.

  Based on the result, in the inference function 423, the logical product (AND) in the inference rule is calculated with the minimum value of each certainty factor, thereby obtaining the minimum value min corresponding to each rule. The certainty factors SG1, SG2, SG3, and SG4 are obtained.

  As a control rule corresponding to SG1, when the incoming tension changes in the decreasing direction and the outgoing tension changes in the increasing direction, it corresponds to lowering the successive gain. Regarding SG2, on the contrary, the case where the entry side tension changes in the increasing direction and the exit side tension changes in the decreasing direction is shown. In these cases, it is necessary to lower the successive function gain SG (set to -1.0).

  On the other hand, as the control rule corresponding to SG3, when the incoming tension changes in the decreasing direction and when the outgoing tension changes in the decreasing direction, and as the control rule corresponding to SG4, the incoming tension increases. When the output side tension changes in the increasing direction, it is necessary to maintain the successive function gain SG without changing (to 1.0).

  In order to realize this, in the gain calculation function of 424, first, SGX is obtained. SGX is set to −1.0 when the SG1 or SG2 rule that needs to lower the successive function gain is applied, and 1.0 when the SG3 or SG4 rule that needs to be raised is applied. It has become.

  From the value of SGX, the successive function gain SG is obtained by a hysteresis function. Since hysteresis is provided, once the successive function gain is lowered, SGX does not return to the base unless it exceeds a certain value. On the contrary, if SGX is not less than a certain value, the successive function gain is not lowered. Thereby, it becomes possible to control stably.

  FIG. 10 shows an outline of the operation when the successive function gain adjusting device 42 of FIG. 6 is used. The successive function gain SG shown in FIG. 10C is changed based on the relationship between the changing direction of the incoming tension shown in FIG. 10A and the outgoing tension shown in FIG. 10B. In this case, when the incoming tension shown in FIG. 10A increases and the outgoing tension shown in FIG. 10B decreases, SG2 is applied as shown in 103. In this case, the successive function gain SG shown in FIG. 10C is applied. Is reduced from 1.0 to 0.0 (to -1.0).

  Further, when the entry side tension shown in FIG. 10A decreases and the exit side tension shown in FIG. 10B also decreases, SG3 is applied as shown in 104. In this case, the successive function gain SG shown in FIG. Return from 0.0 to 1.0 (set to 1.0).

The structure of Sakusesshibu function gain adjustment device 42, another method for determining by using the relationship between the entry side tension T _b and the exit-side tension T _f described in FIG. 6, be determined from the steel type and rolling schedule of material to be rolled Is also possible. When the neutral point position often changes during rolling, if it can be empirically predicted from the steel type or rolling schedule, the neutral function position SG is set to a numerical value of about 0 or 0.2 in advance. It is possible to remove the influence due to the change of the.

  Further, since the change of the neutral point position often occurs when the speed of the rolling mill is changing, the successive function gain SG is lowered during the speed change of the rolling mill, and is returned to the original state at the end of the speed change. It is also possible. Further, when rolling with a specific steel type and rolling schedule, it is possible to remove the influence of the change in the neutral point position by lowering the successive function gain SG during the speed change of the rolling mill.

  FIG. 11 shows an outline of an operation method of the successive function gain adjusting device 42 when the three functions described above are applied. Consider the successive function gain SG shown in FIG. 11B when rolling the rolled material having the three types of steel types A111, B112, and C113 shown in FIG. 11A and the rolling schedule.

  Steel type A111 shown in FIG. 11A is determined to have a large neutral point variation from the steel type and rolling schedule. In the case of this steel type A111, the successive functional gain SG is lowered throughout the entire rolling range. Steel type B112 shown in FIG. 11A is a case where the neutral point fluctuation is judged to be large when the rolling speed changes. In this steel type B112, the acceleration / deceleration unit is forced to have a successive function gain as shown in [1]. Lower.

  Steel type C113 shown in FIG. 11A is a case where it is determined that the neutral point variation is small. In the case of steel type C113, basically, the function gain SG is 1.0. In any case, the successive function gain adjustment is applied in accordance with the changing direction of the entry side tension and the exit side tension, and [2] is the case where the success function gain SG is lowered by the function.

  FIG. 7 shows the details of the successful arithmetic unit 41. The inter-stand tension control device 32 outputs a constant control output in order to maintain the inter-stand tension. Whether or not to use the successive function 40 is determined by the successive function gain adjusting device 42 according to the rolling state, so that whether or not to apply the successive function 40 to the control output of the inter-stand tension control device 32 can be changed. It is necessary to.

It is the successive arithmetic device 41 that realizes this. The difference of the output of the inter-stand tension control device 32 (difference (−) from the previous value Z− ¹ ) is taken and multiplied by the successive function gain SG which is the output result of the successive function gain adjustment device 42 (×), and thereafter Integrate (1 / S). By outputting the integration result to the entry side bridle roll speed control device 25 together with the output of the entry side tension control 33, it is possible to determine whether or not to perform the successive function 40 according to the rolling state.

  FIG. 9 shows the actual machine test results when the function is not applied and the successor function is not provided. Compared to the case with the successive function of FIG. 8, the vibration phenomenon of the # 1 stand outlet side plate thickness shown in FIG. 9B is eliminated, and fluctuations in the inlet side tension 95 and the inter-stand tension 94 shown in FIG. 9D are also reduced. I understand. From this result, the effectiveness of the present embodiment can be confirmed.

In this embodiment, a two-stand tandem rolling mill is taken as an example, but a tandem rolling mill composed of a large number of stands can be similarly configured. Moreover, although the entry side bridle roll 3 which is a rolling mill entrance side equipment is used as the operation end of the successive function 40, it can be similarly configured in a rolling mill stand.
In the embodiment, the successive function 40 is performed on the upstream side of the speed operation stand. However, even when performed on the downstream side, it can be configured in the same manner as the present embodiment.

Next, Embodiment 2 will be described.
In the first embodiment described above, the thickness control of the # 1 stand is performed by the # 1 stand pressure reduction control device 21 as the control operation end of the plate thickness control, and the entry side tension meter 13 is used as the control operation end of the tension control. The tension is controlled by controlling the speed of the # 1 stand by the # 1 stand speed controller 23 using the entry side tension and the exit side tension detected by the inter-stand tension meter 14.

  Then, by using the entrance side tension meter 13 and the exit side tension meter 14 on the entrance side of the # 1 stand rolling mill 1 and the exit side tension, the extent to which the successive function 40 is used is determined. A successive function gain adjustment device 42 is provided to adjust the gain of the successive operation device 41.

  Not limited to this, as shown in FIG. 12, the thickness control is performed by controlling the speed of the # 1 stand by the # 1 stand speed control device 23 as the control operation end of the plate thickness control, and the control operation end of the tension control. As in the case of the control configuration in which the tension is controlled by the # 1 stand pressure reduction control device 21, it is possible to apply the similar function gain adjusting device 42 as in the first embodiment.

  It goes without saying that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

It is a figure which shows the control method and apparatus of a tandem rolling mill. It is a figure which shows the structure of a 2 stand tandem rolling mill. It is a figure which shows the basic formula of rolling, FIG. 3A is a mass flow type, FIG. 3B is a tension type. It is a figure which shows the speed during rolling, FIG. 4A is during a regular rolling, FIG. 4B is a case where # 1 stand speed is changed. It is a figure which shows the neutral point in rolling, an advance rate, and a reverse rate. It is a figure which shows the structure of a successive function gain adjustment apparatus. It is a figure which shows the structure of a successive arithmetic unit. It is a figure which shows the test result (with a successive function) in an actual machine, FIG. 8A is rolling speed, FIG. 8B is # 1 stand exit side plate thickness, FIG. 8C is rolling AGC output, FIG. 8D is tension, FIG. is there. It is a figure which shows the test result (without a successive function) in an actual machine, FIG. 9A is rolling speed, FIG. 9B is # 1 stand exit side plate thickness, FIG. 9C is rolling AGC output, FIG. 9D is tension, FIG. is there. It is a figure which shows the operation | movement outline | summary of a successive function gain adjustment apparatus, FIG. 10A is an entrance side tension | tensile_strength, FIG. 10B is an exit side tension | tensile_strength, FIG. 10C is a successive function gain. It is a figure which shows the operation | movement method outline | summary of a successive function gain adjustment apparatus, FIG. 11A is a steel grade or a rolling schedule, FIG. 11B is a successive function gain. It is a figure which shows the control method and apparatus of a 2nd tandem rolling mill.

Explanation of symbols

5 ... material to be rolled, 21 ... # 1 stand down control device, 22 ... # 2 stand down control device, 23 ... # 1 stand speed control device, 24 ... # 2 stand speed control device, 25 ... entry side bridle roll speed control Device ... 31 ... Thickness control device, 32 ... Stand tension control device, 33 ... Entry side tension control device, 40 ... Successive function, 41 ... Successive arithmetic device, 42 ... Successive function gain adjustment device

Claims (10)

A rolling mill for controlling a tandem rolling mill comprising a plurality of rolling control devices for controlling the rolling of a plurality of rolling mill stands for rolling the material to be rolled, and a plurality of speed control devices for controlling the speeds of the plurality of rolling mill stands. In the control device,
The sheet thickness control or tension control of the material to be rolled functions when changing the speed of each rolling mill stand of the plurality of rolling mill stands,
The same change in speed on the upstream side of the rolling mill stand that operates the speed and on the inlet side of the tandem rolling mill, or the change in speed on the downstream side of the rolling mill stand that controls the speed and on the outlet side of the tandem rolling mill A successful arithmetic device that performs a successful operation to operate to a ratio,
A successive function gain adjustment device that can be adjusted to change the gain of the successive operation for the successive computing device according to the rolling state of the material to be rolled;
A rolling mill control device comprising: In the rolling mill control device according to claim 1,
The gain change of the successive operation for the successive computing device according to the rolling state of the material to be rolled by the successive function gain adjusting device is due to the tension fluctuation before and after each of the rolling mill stands of the plurality of rolling mill stands. A rolling mill control device. In the rolling mill control device according to claim 1,
A rolling mill characterized in that the gain change of the successive operation for the successive computing device according to the rolling state of the material to be rolled by the successive function gain adjusting device is based on the steel type and rolling schedule of the material to be rolled. Control device. In the rolling mill control device according to claim 1,
The rolling mill control device characterized in that the gain change of the successive operation for the successive computing device according to the rolling state of the material to be rolled by the successive function gain adjusting device is based on the rolling speed of the material to be rolled. . In the rolling mill control device according to claim 1,
According to the successive function gain adjustment device, the gain change of the successive operation for the successive operation device according to the rolling state of the material to be rolled is due to the steel type, rolling schedule and rolling speed of the material to be rolled. Rolling mill control device. In the rolling mill control device according to claim 1,
The gain change of the successive operation for the successive operation device according to the rolling state of the material to be rolled by the successive function gain adjusting device is as follows:
The tension on the upstream side of the rolling mill stand that operates the speed or the inlet side of the tandem rolling mill changes up, and the tension on the downstream side of the rolling mill stand that controls the speed or the outlet side of the tandem rolling mill changes down. If
Or, the tension on the upstream side of the rolling mill stand that operates the speed or the inlet side of the tandem rolling mill changes downward, and the tension on the downstream side of the rolling mill stand that controls the speed or the outgoing tension of the tandem rolling mill changes. A rolling mill control device characterized by lowering the gain of the successive operation. In the rolling mill control device according to claim 1,
The gain change of the successive operation for the successive operation device according to the rolling state of the material to be rolled by the successive function gain adjusting device is as follows:
The tension on the upstream side of the rolling mill stand that operates the speed or the inlet side of the tandem rolling mill increases, and the tension on the downstream side of the rolling mill stand that controls the speed or the outgoing tension of the tandem rolling mill changes. If
Alternatively, the tension on the upstream side of the rolling mill stand that operates the speed or the inlet side of the tandem rolling mill changes downward, and the tension on the downstream side of the rolling mill stand that controls the speed or the outgoing tension of the tandem rolling mill changes. In this case, the rolling mill control device is characterized in that the gain of the successive operation is not changed. In the rolling mill control device according to claim 1,
The gain change of the successive operation for the successive operation device according to the rolling state of the material to be rolled by the successive function gain adjusting device is as follows:
Rolling characterized in that, depending on the steel type of the material to be rolled and the rolling schedule, the gain is reduced across the entire rolling range, and the acceleration / deceleration unit switches between the case where the gain is forcibly lowered or the case where the gain is not changed. Machine control device. A tandem provided with a plurality of rolling mill stands for rolling the material to be rolled, a plurality of rolling control devices for controlling the rolling of the plurality of rolling mill stands, and a plurality of speed control devices for controlling the speeds of the plurality of rolling mill stands In the rolling mill control system that controls the rolling mill,
The sheet thickness control or tension control of the material to be rolled functions when changing the speed of each rolling mill stand of the plurality of rolling mill stands,
The same change in speed on the upstream side of the rolling mill stand that operates the speed and on the inlet side of the tandem rolling mill, or the change in speed on the downstream side of the rolling mill stand that controls the speed and on the outlet side of the tandem rolling mill A successful arithmetic device that performs a successful operation to operate to a ratio,
A successive function gain adjustment device that can be adjusted to change the gain of the successive operation for the successive computing device according to the rolling state of the material to be rolled;
A rolling mill control system comprising: With respect to a plurality of rolling mill stands for rolling the material to be rolled, the reduction of the plurality of rolling mill stands is controlled by a plurality of reduction control devices, and the speed of the plurality of rolling mill stands is controlled by a plurality of speed control devices. In the rolling mill control method for controlling the tandem rolling mill by
It is a function when changing the speed of each rolling mill stand of the plurality of rolling mill stands to control the thickness or tension of the material to be rolled,
The same change in speed on the upstream side of the rolling mill stand that operates the speed and on the inlet side of the tandem rolling mill, or the change in speed on the downstream side of the rolling mill stand that controls the speed and on the outlet side of the tandem rolling mill A succession calculation step for performing a succession operation for operating to a ratio,
Successive function gain adjustment step adjustable to change the gain of the successive operation for the successive computing device according to the rolling state of the material to be rolled,
The rolling mill control method characterized by including.

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