Control system and control method for continuous rolling mill

Abstract

The technology of the present disclosure is applicable to a control system of a continuous rolling mill provided with a roll stand. This control system is provided with a storage device that holds learning data calculated on the basis of time series data acquired during rolling. The control system calculates a set value of the roll speed of the roll stand on the basis of the learning data, acquires a value of a correction command applied to the set value while the steel plate passes through the continuous rolling mill, and updates the learning data on the basis of the acquired value of the correction command.

Description

Technical Field

[0001] The present disclosure relates to a control system and a control method for a continuous rolling mill including rolling stands. Background Art

[0002] In the technical field such as hot finish rolling, a continuous rolling mill including a plurality of rolling stands is used. Patent Document 1 discloses a control device for a hot strip mill that controls values such as the tension of a steel sheet to desired values with a hot rolling mill including a plurality of rolling stands as a control target.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 5783925 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In a continuous rolling mill, when the front end portion of a steel sheet sent out from an upstream rolling stand is bitten into a downstream rolling stand, if the speed at which the downstream rolling stand pulls in the steel sheet is slow, the steel sheet slackens between the rolling stands, sometimes resulting in a threading failure. On the contrary, if the speed at which the downstream rolling stand pulls in the steel sheet is slow, the steel sheet is stretched between the rolling stands, sometimes resulting in a poor sheet width called width reduction. Therefore, in order to appropriately maintain the tension of the steel sheet, it is necessary to control the roll speed of each rolling stand to an appropriate value.

[0008] The present disclosure has been made in view of such problems. An object of the present disclosure is to provide a technique capable of improving the control accuracy of the roll speed of a rolling stand when a steel sheet passes through a continuous rolling mill.

[0009] Means for Solving the Problems

[0010] The technique of the present disclosure is applied to a control system for a continuous rolling mill.

[0011] The control system of the present disclosure is characterized by including: one or more processors; and a storage device that holds learning data calculated based on time-series data obtained during rolling.

[0012] The one or more processors are configured to,

[0013] calculate a set value of the roll speed of a rolling stand based on the learning data,

[0014] acquire a value of a correction instruction applied to the set value during the period when the steel sheet passes through the continuous rolling mill,

[0015] update the learning data based on the acquired value of the correction instruction.

[0016] The technology of the present disclosure is applicable to the control method of a continuous rolling mill.

[0017] The control method of the present disclosure is characterized by including:

[0018] A step of calculating a set value of the roll speed of the rolling stand according to learning data calculated based on time-series data obtained during past rolling;

[0019] A step of obtaining the value of a correction instruction applied to the above set value during the period when the steel plate passes through the continuous rolling mill; and

[0020] A step of updating the learning data based on the obtained value of the correction instruction.

[0021] Advantages of the Invention

[0022] According to the control system and control method of the present disclosure, the roll speed of the rolling stand is set based on learning data. In addition, the learning data is updated based on the value of the correction instruction. The value of the correction instruction is the value of the correction instruction applied to the set value of the roll speed during the period when the steel plate passes through the continuous rolling mill. By using the learning data updated in this way, it is possible to set the roll speed so that an appropriate tension is achieved when the steel plate passes through the continuous rolling mill even without depending on the accuracy of the rolling model. In this way, the control accuracy of the roll speed can be improved. Description of the Drawings

[0023] Figure 1 It is a block diagram showing a configuration example of the control system according to an embodiment of the present disclosure.

[0024] Figure 2 It is a block diagram showing an example of the configuration of the functions of the control system according to an embodiment of the present disclosure.

[0025] Figure 3 It is a diagram for explaining the operations of the rolling stand and the loop when the steel plate passes through the continuous rolling mill.

[0026] Figure 4 It is a block diagram showing an example of the flow of information in the setting step.

[0027] Figure 5 It is a block diagram showing an example of the flow of information in the control step in the first embodiment.

[0028] Figure 6 It is a block diagram showing another example of the flow of information in the control step of the first embodiment.

[0029] Figure 7 It is a block diagram showing an example of the flow of information in the learning step.

[0030] Figure 8It is a block diagram showing an example of the flow of information in the control steps of the second embodiment.

[0031] Figure 9 It is a block diagram showing an example of the flow of information in the control steps of the third embodiment.

[0032] Figure 10 It is a block diagram showing an example of the flow of information in the control steps of the fourth embodiment.

[0033] Figure 11 It is a block diagram showing an example of the flow of information in the control steps of the fifth embodiment. Detailed Embodiment

[0034] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0035] 1. Configuration of the Control System

[0036] The system according to this embodiment is a control system for controlling a continuous rolling mill. Use Figure 1 and Figure 2 to illustrate the configuration of the control system.

[0037] The continuous rolling mill 200 includes a plurality of rolling stands F1 to Fn and one or more loopers LP1 to LPm. n is any natural number of 2 or more, and m is any natural number of 1 or more. The rolling stands F1 to Fn and the loopers LP1 to LPm are arranged such that one or more loopers are provided between each rolling stand. In addition, hereinafter, as the reference numeral for the rolling stand, when one is determined, the reference numerals F1, F2,... Fn are used, but when referring to any rolling stand and in the case of a general term, the reference numeral F is used. The same applies to the looper. As the reference numeral for the looper, when referring to any looper and in the case of a general term, the reference numeral L is used.

[0038] The control system 100 controls at least the roll speed of each rolling stand F. In addition, the control system 100 may also control the screwdown position of the rolling stand F and the looper angle of the looper LP. The control system 100 is connected to each rolling stand F and each looper LP through the control network 30.

[0039] Figure 1This is an example of the hardware configuration of control system 100. Control system 100 includes a processor 101, a program memory 102, a data storage memory 103, a communication module 104, and a user interface 105. The processor 101 can be a CPU, RISC, DSP, FPGA, ASIC, PLD, or other processing unit, or a combination of two or more of them, and can also be a dedicated processor for control system 100. In this embodiment, the number of processors 101 is one, but control system 100 can also include multiple processors 101.

[0040] The program memory 102 is communicatively coupled to the processor 101. A program composed of a plurality of instructions INST executable by the processor 101 is stored in the program memory 102. The program composed of the instructions INST can be obtained using a computer-readable non-transitory storage medium or via a network. In addition, the program memory 102 can also be built into the processor 101.

[0041] The data storage memory 103 is communicatively coupled to the processor 101. Learning data DATA is registered in the data storage memory 103. The learning data DATA is data for correcting the set value of the roll speed of the rolling mill stand F. The learning data DATA is calculated based on the time-series data obtained during past rolling. The time-series data used for calculating the learning data DATA includes time-series data on the value of the correction instruction. In addition, the data storage memory 103 can also be built into the processor 101.

[0042] The communication module 104 is communicatively coupled to the processor 101. The communication module 104 is provided for communicating with an external device. The external device includes a host computer 40 that determines rolling-related specifications such as the product plate thickness.

[0043] The user interface 105 is communicatively coupled to the processor 101. The user interface 105 is set up so that an operator who manages the rolling line can input information. The correction instruction described later can also be input by the operator via the user interface 105.

[0044] Use Figure 2 to illustrate the functions of the control system 100 configured as described above. However, here, taking a continuous rolling mill as an example, two adjacent rolling mill stands F and their associated functions are shown. The control system 100 includes a rolling mill stand control device 2, a loop control device 3, a setting device 4, and a learning device 10. The functions of these devices are realized by reading instructions INST from the program memory 102 and executing them by the processor 101. The functions of each device can be respectively composed of independent hardware, or one hardware can have the functions of multiple devices.

[0045] The rolling mill stand control device 2 is provided separately for each rolling mill stand F. Figure 2 Only two rolling mill stand control devices 2 corresponding to two adjacent rolling mill stands F are shown. The rolling mill stand control device 2 controls the rolling mill stand F. The rolling mill stand control device 2 at least includes a roll speed control unit 21 that controls the roll speed of the rolling mill stand F. The rolling mill stand control device 2 may also include a screw down position control unit 22 that controls the screw down position of the rolling mill stand F.

[0046] The loop control device 3 is provided separately for each loop LP. Figure 2 Only one loop control device 3 corresponding to the loop LP provided between two adjacent rolling mill stands F is shown. The loop control device 3 controls the loop LP. For example, the loop control device 3 obtains the tension of the steel plate detected by the loop LP, and controls the loop angle and torque of the loop LP based on the obtained tension.

[0047] One setting device 4 is provided in the control system 100. All the rolling mill stand control devices 2 and loop control devices 3 in the control system 100 are connected to this one setting device 4. The setting device 4 at least sets the roll speed of each rolling mill stand F, and outputs the set value to the roll speed control unit 21 corresponding to each rolling mill stand F. In addition to this, the setting device 4 may also perform the setting of the screw down position of each rolling mill stand F, as well as the setting of the angle target value and tension target value of each loop LP, and output the set values to the screw down position control unit 22 corresponding to each rolling mill stand F and the loop control device 3 corresponding to each loop LP, respectively.

[0048] One learning device 10 is provided in the control system 100 corresponding to the setting device 4. The learning device 10 and the setting device 4 do not necessarily need to be different devices, and may also be one device. The learning device 10 includes a learning value storage unit 11, a learning value calculation unit 12, and a data acquisition unit 13. The learning value storage unit 11 stores, as learning data, the learning values for roll speed correction managed by a hierarchical table. Hierarchical is a concept for distinguishing rolling conditions such as the steel type, thickness, width, target plate thickness, and rolling mill stand number of the steel plate. For example, when the steel type is divided into m types and the width is divided into n types, the hierarchical table is composed of m×n cells. The learning value is a coefficient for correcting the roll speed of each rolling mill stand set based on the rolling model, and is calculated based on the past rolling performance and stored by the learning value storage unit 11.

[0049] The learning value calculation unit 12 calculates the learning value for updating the learning data. The calculation of the learning value calculation unit 12 is performed whenever rolling is completed, and the calculated learning value updates the value of the cell consistent with the rolling conditions of the rolled material and is recorded. The data acquisition unit 13 acquires the data for updating the learning data.

[0050] Use Figure 3 The operations of rolling stands F1 to Fn and loopers LP1 to LPm when a steel sheet passes through a continuous rolling mill will be described. In Figure 3 the figure, the left side is the upstream side of the continuous rolling mill, and the right side is the downstream side. In addition, the arrow in the longitudinal direction indicates the passage of time.

[0051] While moving from the upstream side to the downstream side in the continuous rolling mill, the steel sheet is rolled into a specified thickness. The steel sheet 1 fed into the continuous rolling mill is first bitten into the rolling stand F1, and then sent out from the rolling stand F1 and bitten into the rolling stand F2. The same applies to the rolling stands F2 and below. The steel sheet 1 sent out from the rolling stand F is bitten into the adjacent downstream rolling stand F, and this operation is repeated until the steel sheet 1 is bitten into the rolling stand Fn.

[0052] Consider the tension of the steel sheet 1 between the rolling stand Fi and the rolling stand Fi + 1 after the steel sheet 1 is bitten into the rolling stand Fi+1. i is any natural number where 1 ≤ i ≤ n - 1. The tension of the steel sheet 1 is determined by the balance of the delivery speeds of the rolling stand Fi and the rolling stand Fi + 1. That is, when the speed at which the rolling stand Fi+1 pulls in the steel sheet 1 is slower than the speed at which the rolling stand Fi delivers the steel sheet 1, the steel sheet 1 becomes slack, and when it is faster, the steel sheet 1 becomes taut. The delivery speed of the rolling stand F is determined by the roll speed. Excessive slack or tautness of the steel sheet 1 may cause a through-feed failure, so the roll speed of the rolling stand F is controlled to make the tension of the steel sheet 1 an appropriate tension.

[0053] In addition, in order to alleviate the change in the tension of the steel sheet 1, a looper LP is provided between the rolling stand Fi and the rolling stand Fi + 1. By changing the looper angle of the looper LPi, the path length of the steel sheet 1 when passing between the rolling stand Fi and the rolling stand Fi + 1 can be increased or decreased. After the steel sheet 1 is bitten into the rolling stand Fi+1, the looper LPi provided between the rolling stand Fi and the rolling stand Fi + 1 rises to adjust the path length of the steel sheet 1 between the rolling stand Fi and the rolling stand Fi + 1.

[0054] The roll speed of the rolling stand F is determined based on the set value calculated before the steel sheet 1 is fed into the rolling stand F1 and the value of the correction command received during rolling. The set value is calculated by the setting device 4 and sent to the rolling stand control device 2. In addition, the correction command is sent from the looper LP and the adjacent rolling stand F.

[0055] Regarding the correction command sent from the looper LP, after the looper LP rises, a correction command is sent according to the angle of the looper LP or the tension detected in the looper LP to correct the roll speed of the rolling stand Fi upstream of the looper LP or the rolling stand Fi + 1 downstream of it.

[0056] In addition, if the roll speed of any rolling mill F is corrected after the steel plate 1 is bitten into the rolling mill stand F3 and before the subsequent rolling mill stand F, the tension between the rolling mill stands F on the more upstream side or downstream side also changes accordingly. Therefore, the correction of the roll speed requires a chain reaction to be carried out on the rolling mill stands on the more upstream side or downstream side. In such a case, a correction instruction from the rolling mill stand F is issued.

[0057] The chain reaction correction of the roll speed is centered around the key rolling mill stand. The key rolling mill stand is the backbone stand, and any one of the multiple rolling mill stands F1 to Fn can be used as the key rolling mill stand. The change in the roll speed of the rolling mill stands F1 to Fn set throughout the continuous rolling mill is reflected in the entire continuous rolling mill by changing the roll speed starting from the key rolling mill stand and transmitting the speed correction instruction to the adjacent rolling mill stands. In addition, when a correction instruction for tension control is generated on the upstream side (or downstream side) of the key rolling mill stand, the correction instruction is transmitted to the rolling mill stands on the more upstream side (or downstream side) in a manner away from the key rolling mill stand.

[0058] By adjusting the roll speed of the rolling mill stand Fi or Fi + 1 in this way, the tension of the steel plate 1 between the rolling mill stand Fi and the rolling mill stand Fi + 1 is controlled.

[0059] 2. First Embodiment

[0060] The control system 100 in the first embodiment will be described. The actions performed by the control system 100 can be divided into three steps according to the action timing: the setting step, the control step, and the learning step. The setting step is the step performed before the front end of the steel plate 1 reaches the continuous rolling mill. The control step starts after the front end of the steel plate 1 reaches the continuous rolling mill and ends after the tail end of the steel plate 1 passes through the continuous rolling mill. The learning step is the step performed after the tail end of the steel plate 1 passes through the continuous rolling mill.

[0061] Figure 4 The flow of information in the setting step is shown. In the setting step, in order to meet various product requirements related to the steel grade, size, etc., calculations using the rolling model and learning data are carried out to calculate the set value of the roll speed of the rolling mill stand F. In the setting step, the set values of the reduction position of the rolling mill stand F, the angle target of the loop LP, and the tension target can also be calculated.

[0062] The calculation of the set value is performed by the setting device 4. The setting device 4 inputs the hierarchical information into the learning value storage unit 11. The hierarchical information is stored in the hierarchical information memory of the setting device 4. The learning value storage unit 11 that receives the hierarchical information retrieves the hierarchical table based on the hierarchical information and outputs the obtained learning value to the setting device 4. The setting device determines the set value based on the learning value and the specifications of the steel plate provided by the host computer 40 through operations based on the rolling model, table indexing, etc.

[0063] The setting device 4 calculates the target values of the roll gap position and roll speed of the rolling stand F, the target value of the loop angle of the loop LP, and the target value of the tension of the steel sheet 1 in the loop LP according to the operation result of the rolling model and the learning value obtained from the learning device 10, and outputs them to the rolling stand control device 2 and the loop control device 3.

[0064] Figure 5 And Figure 6 is a diagram showing the flow of information in the control step. In addition, here, it is assumed that the focus stand is the final rolling stand Fn, that is, the case where it is far from the focus stand as it approaches the upstream side, and the explanation will be given based on this. However, any rolling stand F other than the final rolling stand Fn can also be set as the focus stand.

[0065] In the control step, the roll speed of the rolling stand F is controlled. The roll speed control unit 21 of the rolling stand control device 2 calculates a speed correction command for controlling the roll speed of the rolling stand F based on the set value of the roll speed provided by the setting device 4 in the setting step and the value of the correction command provided in the control step, and controls the roll speed of the rolling stand F based on the calculation result. The speed correction command is calculated, for example, as the ratio of the speed change amount to the set value of the roll speed.

[0066] The speed correction command is output from the loop control device 3 that controls the loop LP located behind the rolling stand F and the roll speed control unit 21 of the rolling stand control device 2 that controls the adjacent downstream rolling stand F for the tension control of the steel sheet 1.

[0067] Figure 5 The case where the correction command is output from the loop control device 3 is shown. The loop control device 3 controls the torque of the loop LP based on at least one of the target value of the loop angle and the tension of the steel sheet 1 in the loop LP provided by the setting device 4 before rolling and at least one of the actual values of the loop angle and the tension of the steel sheet 1 obtained from the loop LP in the control step. When the target value and the actual value do not match, a correction command is output to the rolling stand control device 2 that controls the upstream rolling stand F. The control of the loop LP is performed, for example, by PI control using only the angle of the loop or ILQ control using both the angle and tension of the loop.

[0068] In addition, the rolling stand control device 2 outputs a new correction command to the rolling stand control device 2 that controls the adjacent upstream rolling stand F corresponding to the speed change amount changed based on the correction command.

[0069] Figure 6This represents the case where a correction instruction is output from the adjacent rolling mill stand control device 2. Along with the correction of the roll speed of the rolling mill stand F due to the adjacent downstream rolling mill stand control device 2 receiving the correction instruction, a correction instruction is output from the adjacent downstream rolling mill stand F to this rolling mill stand F.

[0070] Also in this case, the rolling mill stand control device 2 outputs a new correction instruction to the rolling mill stand control device 2 that controls the adjacent upstream rolling mill stand F corresponding to the speed change amount changed based on the correction instruction.

[0071] In addition, the data acquisition unit 13 of the learning device 10 collects and stores the actual data of the speed correction instruction for tension control from the rolling mill stand control device 2 at all times during the control step.

[0072] Furthermore, the case where the key stand is a rolling mill stand other than the final rolling mill stand Fn is the same as above. In this case, the output destination of the correction instruction output by the rolling mill stand control device 2 and the loop control device 3 becomes the rolling mill stand control device 2 on the side away from the key stand.

[0073] Figure 7 This is a diagram showing the flow of information in the learning step. In the learning step, the learning value of the learning data is updated. The learning value calculation unit 12 of the learning device 10 calculates the learning value for correcting the roll speed of each rolling mill stand F based on the actual data stored by the data acquisition unit 13 during the control step.

[0074] The calculation of the learning value is performed as follows, for example. First, the learning value calculation unit 12 obtains the time-series data of the speed correction instruction for tension control of the rolling mill stand F from the data acquisition unit 13, and calculates the average value of the speed correction instructions in a pre-specified sampling interval as the learning value in this rolled material. This calculation is represented by Equation (1).

[0075]

[0076] Rolling mill stand F i The learning value of this rolled material

[0077] α Vi [k]: Time-series data of the speed correction instruction for tension control obtained from the data acquisition unit

[0078] k start : Sampling start position of the time-series data

[0079] k end : Sampling end position of the time-series data

[0080] Next, the learning value used for the rolled material is obtained from the learning value storage unit 11, and the updated learning value is calculated. The calculation at this time uses, for example, Equation (2).

[0081]

[0082] Rolling mill stand F i The learning value used for this rolled material

[0083] Rolling mill stand F i The learning value of this rolled material

[0084] Rolling mill stand F i The updated learning value

[0085] K: Learning gain

[0086] Finally, the learning value calculation unit 12 outputs the updated learning value to the learning value storage unit 11. The learning value storage unit 11 indexes the hierarchical table based on the hierarchical information of the steel plate 1 that has been rolled in the control step, and updates the learning value of the corresponding hierarchical table according to the updated learning value provided by the learning value calculation unit 12.

[0087] Above, the control system 100 in the first embodiment has been described. Hereinafter, as other embodiments of the control system 100, the second to fifth embodiments will be described. In the second to fifth embodiments described below, the values obtained in the control step are different. Since the other configurations are the same as those in the first embodiment, the description thereof will be omitted.

[0088] 3. Second embodiment

[0089] Figure 8 is a diagram for explaining the control step in the second embodiment. In the second embodiment, in the control step, the data acquisition unit 13 not only acquires the actual performance data from the rolling mill stand control device 2 at all times, but also acquires and stores the actual performance data of the loop angle from the loop control device 3 at all times. Then, in the learning step, the stored actual performance data is output to the learning device 10.

[0090] In the second embodiment, in the calculation of the learning value by the learning value calculation unit 12, instead of specifying a sampling interval in advance, an interval with a small change in the loop angle, that is, an interval where the tension control is stable, is determined as the sampling interval. For example, the change in the loop angle can also be evaluated based on Equations (3) to (5), and the smallest evaluation value of k start is used as the sample start position. Here, the length of the sample interval can be specified in advance, or multiple lengths can be prepared and the length with the smallest evaluation value can be selected.

[0091] The operations related to the determination of the sample interval are represented by the following equations (3) to (5).

[0092]

[0093] J[k start :Evaluation value of the angular variation of the loop LP i ~LP N-1 to

[0094] N: Final stand number

[0095] Loop LP i Evaluation weight

[0096] Loop LP i ~LP N-1 Angle interval K start ~K start Moving standard deviation of +M

[0097] Loop LP i ~LP N-1 Angle interval K start ~K start Moving average of +M

[0098] M: Length of the sampling interval

[0099] In addition, if the screw-down position is changed to control the plate thickness, the mass flow rate changes compared to when the plate passes through. Therefore, the sample interval is preferably close to the front end. Thus, equations (6) and (7) with a term f(k) that guides towards the front end added to equation (3) can also be used for the operation. f(k) can be any function that increases as k increases. In the example of equation (7), f(k) is a linear function of the coefficient α. α is an adjustment coefficient.

[0100]

[0101] f(k) = a·k ··· Equation (7)

[0102] 4. Third Embodiment

[0103] Figure 9 is a diagram for explaining the control steps in the third embodiment. The third embodiment is a modification of the second embodiment. In the third embodiment, instead of the loop angle used for the operation in equations (3) to (7), the sampling interval is determined based on the actual data of the loop tension. In the control steps, the data acquisition unit 13 not only acquires the actual data from the rolling mill stand control device 2 at all times, but also acquires and stores the actual data of the loop tension from the loop control device 3 at all times.

[0104] The achieved actual data is output to the learning device 10 in the learning step.

[0105] 5. Fourth Embodiment

[0106] Figure 10 It is a diagram for explaining the control step in the fourth embodiment. In the control step, the roll speed control unit 21 of the rolling mill stand control device 2 creates a speed correction command corresponding to the speed change intervened manually by the operator, and also calculates the final speed correction command for tension control based on the created speed correction command to control the roll speed of the rolling mill stand F. The fourth embodiment can also be combined with any one of the first to third embodiments.

[0107] 6. Fifth Embodiment

[0108] Figure 11 It is a diagram for explaining the control step in the fifth embodiment. When the rolling reduction position of the rolling mill stand F is changed in the control step, the rolling reduction position control unit 22 acquires the changed rolling reduction position. Then, a correction command for the roll speed for tension control corresponding to the changed rolling reduction position is created and the correction command value is provided to the roll speed control unit 21 in the rolling mill stand control device 2 provided with this rolling reduction position control unit 22. The roll speed control unit 21 of the rolling mill stand control device 2 creates a speed correction command corresponding to the correction command value provided from the rolling reduction position control unit 22, and also calculates the final speed correction command for tension control based on the generated speed correction command to control the roll speed of the rolling mill stand F.

[0109] The fifth embodiment can also be combined with the first to fourth embodiments.

[0110] 7. Effects

[0111] As described above, each embodiment of the present invention has been described. Thus, in the present invention, instead of setting the roll speed on the premise of the mass flow rate constant law, the actual results of the correction amount of the roll speed obtained in the past rolling are utilized. Thereby, it is possible to appropriately adjust the tension of the steel sheet between the rolling mill stands regardless of the accuracy of the rolling model, and it is possible to increase the production volume based on the reduction of the threading failure and improve the yield rate based on the prevention of over-tension.

[0112] Explanation of Reference Numerals

[0113] DATA Learning data

[0114] INST Instruction

[0115] F Rolling mill stand

[0116] LP Looper

[0117] 1 Steel plate

[0118] 2 Rolling mill stand control device

[0119] 3 Looper control device

[0120] 4 Setting device

[0121] 10 Learning device

[0122] 11 Learning value storage unit

[0123] 12 Learning value calculation unit

[0124] 13 Data acquisition unit

[0125] 21 Roll speed control unit

[0126] 22 Screwdown position control unit

[0127] 30 Control network

[0128] 40 Host computer

[0129] 100 Control system

[0130] 101 Processor

[0131] 102 Program memory

[0132] 103 Memory for data storage

[0133] 104 Communication module

[0134] 105 User interface

[0135] 200 Continuous rolling mill

Claims

1. A control system for a continuous rolling mill, characterized in that, Comprising: One or more processors; and A storage device that holds learning data calculated based on time-series data obtained during rolling, Said one or more processors are: Based on said learning data, calculate a set value of the roll speed of the rolling mill stand, During the passage of the steel plate through said continuous rolling mill, obtain the value of a correction instruction applied to said set value, Based on the obtained value of said correction instruction, update said learning data.

2. The control system of the continuous rolling mill according to claim 1, characterized in that: Said rolling mill stand includes a first rolling mill stand and a second rolling mill stand adjacent to the first rolling mill stand on the opposite side of the key stand, Said one or more processors are: Based on said set value of the roll speed, control the roll speed for said first rolling mill stand and said second rolling mill stand respectively, Based on the speed correction information provided to said first rolling mill stand, generate speed correction information for correcting the roll speed of said second rolling mill stand, Said correction instruction includes speed correction information for correcting the roll speed of said second rolling mill stand.

3. The control system of the continuous rolling mill according to claim 1, characterized in that: Said one or more processors are: Based on the difference between the target value and the actual value of the loop angle for controlling the loop located on the key stand side with respect to said rolling mill stand, or the difference between the target value of the tension of the steel plate passing through said continuous rolling mill and the actual value obtained in said loop, generate speed correction information for correcting the roll speed of said rolling mill stand, Said correction instruction includes speed correction information for correcting the roll speed of said rolling mill stand.

4. The control system of the continuous rolling mill according to claim 1, characterized in that: Said correction instruction includes a correction instruction for said roll speed manually input by an operator.

5. The control system of the continuous rolling mill according to claim 1, characterized in that: Said one or more processors are: When the reduction position of said rolling mill stand is changed during the passage of the steel plate through said continuous rolling mill, generate speed correction information for correcting said roll speed corresponding to the changed reduction position, Said correction instruction includes speed correction information for correcting said roll speed.

6. The control system of the continuous rolling mill according to any one of claims 1 to 5, characterized in that: Said one or more processors are: During the passage of the steel plate through said continuous rolling mill, obtain time-series data of the loop angle of the loop located on the key stand side with respect to said rolling mill stand, Based on the time-series data of said loop angle, determine a sampling interval for obtaining said correction instruction for updating said learning data.

7. The control system of the continuous rolling mill according to any one of claims 1 to 5, characterized in that: Said one or more processors are: During the passage of the steel plate through said continuous rolling mill, obtain time-series data of the tension of the steel plate obtained in the loop located on the key stand side with respect to said rolling mill stand, Based on the time-series data of said tension, determine a sampling interval for obtaining said correction instruction for updating said learning data.

8. A control method for a continuous rolling mill, characterized in that, Including: A step of calculating a set value of the roll speed of the rolling mill stand based on learning data calculated from time-series data obtained during past rolling; A step of obtaining a value of a correction instruction applied to the set value during passage of the steel sheet through the continuous rolling mill; and A step of updating the learning data based on the obtained value of the correction instruction.

9. The control method of the continuous rolling mill according to claim 8, wherein The rolling mill stand includes a first rolling mill stand and a second rolling mill stand adjacent to the first rolling mill stand on the side opposite to the key stand, The control method further includes: A step of controlling the roll speed for the first rolling mill stand and the second rolling mill stand respectively based on the set value of the roll speed; and A step of generating speed correction information for correcting the roll speed of the second rolling mill stand based on the speed correction information provided for the first rolling mill stand, The correction instruction includes speed correction information for correcting the roll speed of the second rolling mill stand.

10. The control method of the continuous rolling mill according to claim 8, wherein The control method further includes: A step of generating speed correction information for correcting the roll speed of the rolling mill stand based on the difference between the target value and the actual value of the loop angle for controlling the loop on the key stand side with respect to the rolling mill stand, or the difference between the target value of the tension of the steel sheet passing through the continuous rolling mill and the actual value obtained in the loop, The correction instruction includes speed correction information for correcting the roll speed of the rolling mill stand.

11. The control method of the continuous rolling mill according to claim 8, wherein The correction instruction includes a correction instruction of the roll speed manually input by an operator.

12. The control method of the continuous rolling mill according to claim 8, wherein The control method further includes: A step of generating speed correction information for correcting the roll speed corresponding to the changed screw-down position in the case where the screw-down position of the rolling mill stand is changed during passage of the steel sheet through the continuous rolling mill, The correction instruction includes speed correction information for correcting the roll speed.

13. The control method of the continuous rolling mill according to any one of claims 8 to 12, wherein The control method further includes: A step of obtaining time-series data of the loop angle of the loop on the key stand side with respect to the rolling mill stand during passage of the steel sheet through the continuous rolling mill; and A step of determining a sampling interval for obtaining the correction instruction for updating the learning data based on the time-series data of the loop angle.

14. The control method of the continuous rolling mill according to any one of claims 8 to 12, wherein The control method further includes: A step of obtaining time-series data of the tension of the steel sheet obtained in the loop on the key stand side with respect to the rolling mill stand during passage of the steel sheet through the continuous rolling mill; and A step of determining a sampling interval for obtaining the correction instruction for updating the learning data based on the time-series data of the tension.

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