A method and apparatus for controlling crown in a continuous rolling mill

Abstract

This invention discloses a crown control method and apparatus for a continuous rolling production line. The method includes: acquiring the current specifications of the current strip, wherein the current strip is the first single coil strip rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode; determining the compensation crown, initial bending roll force, and preset rolling force of the current strip based on the current specifications; obtaining the compensation bending roll force of the current strip based on the compensation crown; obtaining the rolling bending roll force based on the initial bending roll force and the compensation bending roll force; and rolling the current strip based on the rolling bending roll force and the preset rolling force. The control method of this invention combines the rolling characteristics of different steel grades, provides customized compensation crown, and converts the compensation crown into the compensation bending roll force of the current strip. The rolling bending roll force obtained through the initial bending roll force and the compensation bending roll force is applied to the strip. When rolling the current strip with the preset rolling force, the crown control capability and control accuracy are improved, which is of great significance for improving the overall strip shape quality.

Description

Technical Field

[0001] This application relates to the technical field of crown control in continuous rolling mills, and more particularly to a method and apparatus for crown control in continuous rolling mills. Background Technology

[0002] Multi-mode continuous casting and rolling production lines can simultaneously and uninterruptedly switch between single-coil, semi-endless, and fully endless rolling modes to roll strip steel. Compared with traditional hot continuous rolling methods to ensure strip shape quality, improving the crown control accuracy during mode switching in continuous casting and rolling production has become a major challenge. When switching from the last strip steel rolled in fully endless rolling to the first strip rolled in single coil at the end of the rolling process, the thickness and target crown of the first strip are significantly increased compared to the last endless strip. However, the crown self-learning compensation cannot correct this in time, resulting in the actual crown of the single strip steel after the mode switch being significantly smaller than the target crown. This leads to an extremely low single-coil crown hit rate, affecting the overall strip shape quality. Many factors influence the crown of the finished strip steel, among which initial roll shape, bending roll force, and crown self-learning are the main factors. However, due to considerations of rolling stability throughout the entire rolling period, the adjustable space for the initial roll shape is extremely small. This results in low crown control accuracy during the transition from the last rolled strip to the first rolled strip in a single coil, leading to insufficient strip rolling quality on the continuous rolling line.

[0003] Therefore, how to improve the crown control accuracy of the first strip of a single coil during mode switching in a continuous rolling mill is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The present invention provides a crown control method and apparatus for a continuous rolling mill, which improves the crown control accuracy of the first strip of a single coil during mode switching in a continuous rolling mill.

[0005] The embodiments of the present invention provide the following solutions:

[0006] In a first aspect, embodiments of the present invention provide a method for controlling the crown of a continuous rolling mill, the method comprising:

[0007] Obtain the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode;

[0008] Based on the current specifications, determine the compensation crown, initial bending roll force, and preset rolling force of the current strip.

[0009] The compensation bending roll force of the current strip is obtained based on the compensation crown.

[0010] The rolling bending roll force is obtained based on the initial bending roll force and the compensated bending roll force;

[0011] The current strip is rolled according to the rolling bending roll force and the preset rolling force.

[0012] In an optional embodiment, before determining the compensation crown of the current strip according to the current specification, the method further includes:

[0013] Obtain the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel;

[0014] The average convexity deviation is obtained based on all the target convexities and the actual convexities.

[0015] The average crown deviation is stored as the compensation crown of the current strip.

[0016] In an optional embodiment, after storing the average crown deviation as the compensated crown of the current strip, the method further includes:

[0017] Obtain the convexity hit rate threshold and the convexity hit rate for a historical preset period;

[0018] Determine whether the convexity hit rate is greater than the convexity hit rate threshold;

[0019] If not, the compensation convexity is updated within the current preset period until the convexity hit rate is greater than the convexity hit rate threshold.

[0020] In one optional embodiment, obtaining the convexity hit rate of a historical preset period includes:

[0021] Obtain the convexity deviation strip steel of the historical preset period, wherein the convexity deviation strip steel is the strip steel in all historical strip steel where the actual convexity is less than the target convexity;

[0022] The convexity hit rate is obtained based on the convexity deviation strip and all historical strips.

[0023] In one optional embodiment, updating the compensation convexity within the current preset period includes:

[0024] Obtain historical compensation convexity and preset convexity tolerance;

[0025] The current convexity deviation is obtained based on the target convexity and the actual convexity.

[0026] Based on the preset convexity tolerance and the current convexity deviation, the convexity compensation value is obtained;

[0027] The historical compensated convexity is updated to the current compensated convexity based on the convexity compensation value.

[0028] In one optional embodiment, the preset cycle is 40-50 historical strip rolling cycles.

[0029] In one optional embodiment, obtaining the compensating bending roll force of the current strip based on the compensating crown includes:

[0030] Obtain the width of the strip steel of the current specification;

[0031] According to the formula Obtain the compensating bending roll force of the current strip. ,in, The preset rolling force, The width of the strip is... For the compensation convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

[0032] Secondly, embodiments of the present invention also provide a crown control device for a continuous rolling mill, the device comprising:

[0033] The first acquisition module is used to acquire the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode;

[0034] The determination module is used to determine the compensation crown, initial bending roll force and preset rolling force of the current strip steel according to the current specifications.

[0035] The first obtaining module is used to obtain the compensation bending roll force of the current strip steel based on the compensation crown.

[0036] The second obtaining module is used to obtain the rolling bending roll force based on the initial bending roll force and the compensated bending roll force;

[0037] The rolling module is used to roll the current strip steel according to the rolling bending roll force and the preset rolling force.

[0038] In an optional embodiment, the device further includes:

[0039] The second acquisition module is used to acquire the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel.

[0040] The third obtaining module is used to obtain the average convexity deviation based on all the target convexities and the actual convexities;

[0041] A storage module is used to store the average crown deviation as the compensation crown of the current strip.

[0042] In an optional embodiment, the device further includes:

[0043] The third acquisition module is used to acquire the convexity hit rate threshold and the convexity hit rate of historical preset periods;

[0044] The judgment module is used to determine whether the convexity hit rate is greater than the convexity hit rate threshold;

[0045] The update module is used to update the compensation convexity within the current preset period when the convexity hit rate is not greater than the convexity hit rate threshold, until the convexity hit rate is greater than the convexity hit rate threshold.

[0046] In one optional embodiment, the third acquisition module includes:

[0047] The first acquisition submodule is used to acquire the convexity deviation strip steel of the historical preset period, wherein the convexity deviation strip steel is the strip steel in all historical strip steel where the actual convexity is less than the target convexity;

[0048] The first obtaining submodule is used to obtain the convexity hit rate based on the convexity deviation strip and all historical strips.

[0049] In one optional embodiment, the update module includes:

[0050] The second acquisition submodule is used to acquire historical compensation convexity and preset convexity tolerance;

[0051] The second obtaining submodule is used to obtain the current convexity deviation based on the target convexity and the actual convexity;

[0052] The third obtaining submodule is used to obtain the convexity compensation value based on the preset convexity tolerance and the current convexity deviation;

[0053] The update submodule is used to update the historical compensated convexity to the current compensated convexity based on the convexity compensation value.

[0054] In an optional embodiment, the first obtaining module includes:

[0055] The third acquisition submodule is used to acquire the strip width of the current specification;

[0056] The fourth submodule is used to obtain the formula. Obtain the compensating bending roll force of the current strip. ,in, The preset rolling force, The width of the strip is... For the compensation convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

[0057] Thirdly, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the methods described in the first aspect.

[0058] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects.

[0059] The crown control method and apparatus for continuous rolling mills provided by this invention have the following advantages compared with the prior art:

[0060] The control method of this invention, based on the rolling characteristics of different steel grades, when switching from rolling of the end block without a head to the first block of a single coil, combines the rolling rules of different steel grades to obtain the current specifications of the current strip, identifies it, and determines the compensation crown according to the current specifications, providing customized compensation crown to compensate for the crown in a positive or negative way. The compensation crown is then converted into the compensation bending roll force of the current strip. The rolling bending roll force obtained through the initial bending roll force and the compensation bending roll force is applied to the strip. When the current strip is rolled with a preset rolling force, the crown control capability and control accuracy are improved, which is of great significance for improving the overall strip shape quality. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 A flowchart of a crown control method for a continuous rolling mill provided in an embodiment of the present invention;

[0063] Figure 2 A timing diagram for improving the crown control accuracy of continuous rolling mills, provided by an embodiment of the present invention;

[0064] Figure 3 A graph showing the target convexity and actual convexity for implementing the control method of the present invention;

[0065] Figure 4 A graph showing the convexity hit rate for implementing the control method of the present invention;

[0066] Figure 5 The graph shows the target convexity and actual convexity without implementing the control method of the present invention.

[0067] Figure 6 A graph showing the convexity hit rate without implementing the control method of this invention;

[0068] Figure 7 This is a graph of the bending roller force at the end of the machine frame when the control method of the present invention is not implemented;

[0069] Figure 8 This is a schematic diagram of the crown control device for a continuous rolling production line provided in an embodiment of the present invention. Detailed Implementation

[0070] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the protection scope of the embodiments of the present invention.

[0071] Please see Figure 1 , Figure 1 A flowchart of a crown control method for a continuous rolling mill provided in an embodiment of the present invention, the method comprising:

[0072] S11. Obtain the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode.

[0073] Specifically, in a continuous rolling production line, it is possible to freely switch between single-coil rolling, semi-endless rolling, and fully endless rolling. Typically, steel coils are rolled continuously according to the production plan of the continuous rolling line. During switching, various rolling parameters are selected for corresponding rolling. Whether to switch to single-coil mode can be determined by reading the connection identifier; the identifier for fully endless rolling is E, and the identifier for single-coil rolling is C. This automatically identifies the first single-coil strip rolled during the switch from continuous rolling mode to single-coil mode within the rolling period. The current specifications can be obtained from relevant information in the rolling plan, including the steel grade, rolling thickness, and rolling width of the current strip. After obtaining the current specifications, proceed to step S12.

[0074] S12. Based on the current specifications, determine the compensation crown, initial bending roll force, and preset rolling force of the current strip.

[0075] Specifically, during the production process of a continuous rolling line, the first single coil of strip steel rolled when switching from continuous rolling mode to single coil mode is not necessarily of the same specification. There is a corresponding relationship between the current specification of the strip steel and the compensation crown, the initial bending roll force and the preset rolling force. That is, the compensation crown, the initial bending roll force and the preset rolling force are different for different specifications of strip steel. Therefore, the compensation crown, the initial bending roll force and the preset rolling force can be determined by the actual values ​​of the current specification.

[0076] The compensation crown is the crown value of the current strip from the target crown. The compensation crown can be set based on the actual rolling conditions of the current strip specification, with the specific setting determined by the experience of technicians or calibration tests. Alternatively, the compensation crown can be calculated using historical data. The target crown can be obtained based on the current strip rolling quality requirements, while the actual crown can be measured using the actual rolling conditions of historical strips of the same specification. The compensation crown is calculated from the difference between the target crown and the actual crown. The strip crown represents the thickness difference between the center of the strip and the target position at the edge. For example, in crown C40, it represents the thickness difference between the center of the strip and the edge at a distance of 40mm from the center, which is crucial for strip rolling quality. During strip rolling, the rolling crown is mainly controlled by the bending roll force. There is a corresponding relationship between crown and bending roll force. The initial bending roll force can be determined based on the current target crown of the strip. Similarly, the preset rolling force for rolling the current strip can be determined based on the current specification.

[0077] To further improve the accuracy of determining the compensation crown, in one specific embodiment, before determining the compensation crown of the current strip according to the current specifications, the method further includes:

[0078] Obtain the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel; obtain the average crown deviation based on all target crown and actual crown; store the average crown deviation as the compensation crown of the current strip steel.

[0079] Specifically, since all historical strip steels share the same steel grades and specifications as the current strip steel, the crown accuracy of historical strip steels is highly valuable for reference. When the continuous rolling line switches from continuous rolling mode to single coil mode, the rolling record of the first single coil strip steel is considered one cycle. Among all historical strip steels rolled within the preset cycle, some historical strip steels may achieve the target crown, while others may not. By analyzing the difference between the target crown and the actual crown, the crown deviation of each historical strip steel can be obtained. Further averaging yields the average crown deviation, which better characterizes the crown deviation of all historical strip steels within the preset cycle. Storing this as supplementary crown for the current strip steel can improve the accuracy of crown compensation. The preset cycle can be freely set according to actual needs. To reduce computational redundancy while ensuring the accuracy of crown compensation, the preset cycle is set to 40-50 rolling cycles of historical strip steel.

[0080] To further improve the accuracy of the compensation crown, in one specific embodiment, after storing the average crown deviation as the compensation crown of the current strip, the method further includes:

[0081] Obtain the convexity hit rate threshold and the convexity hit rate of the historical preset period; determine whether the convexity hit rate is greater than the convexity hit rate threshold; if not, update the compensation convexity within the current preset period until the convexity hit rate is greater than the convexity hit rate threshold.

[0082] Specifically, to further improve the accuracy of the compensation crown, it is necessary to continuously self-correct and optimize the compensation crown. The crown hit rate threshold can be set to 80-90%. If the crown hit rate of the historical preset period is not greater than this threshold, it means that the compensation crown used in the historical preset period is not accurate enough, and the crown of some strips does not meet the rolling quality requirements. In this case, the compensation crown is updated in the current preset period, and a new compensation crown is used to improve the hit rate of strip crown rolling. The compensation crown can be self-optimized based on the cumulative rolling process until the optimal crown compensation value for each steel grade is determined. Conversely, if the crown hit rate of the historical preset period is greater than this threshold, it means that the compensation crown used in the historical preset period is relatively accurate. In this case, the compensation crown is not updated, and the compensation crown is continued to be used.

[0083] In one specific implementation, obtaining the convexity hit rate for a historical preset period includes:

[0084] Obtain the crown deviation strips for a preset historical period, where the crown deviation strips are those whose actual crown is less than the target crown among all historical strips; obtain the crown hit rate based on the crown deviation strips and all historical strips.

[0085] Specifically, if the actual crown is less than the target crown, it means that the crown of the strip was not hit, and this strip is defined as a crown deviation strip. Crown hit rate = (crown deviation strip / all historical strips) × 100%.

[0086] In one specific implementation, updating the compensation convexity within the current preset period includes:

[0087] Obtain historical compensated convexity and preset convexity tolerance; obtain the current convexity deviation based on the target convexity and actual convexity; obtain the convexity compensation value based on the preset convexity tolerance and current convexity deviation; update the historical compensated convexity to the current compensated convexity based on the convexity compensation value.

[0088] Specifically, when determining whether the roll crown has been hit, a preset roll crown tolerance can be set based on the target roll crown. For example, if the target roll crown is 40 μm, the preset roll crown tolerance can be set to ±10 μm. If the actual roll crown is 25 μm, exceeding the preset roll crown tolerance, it indicates that the rolling roll crown of the strip has not been hit; if the actual roll crown is 35 μm, within the preset roll crown tolerance, it indicates that the rolling roll crown of the strip has been hit. The current roll crown deviation is the difference between the target roll crown and the actual roll crown. If this value exceeds the preset roll crown tolerance, it indicates that the roll crown deviation is too large. The roll crown compensation value can be set to the upper limit of the preset roll crown tolerance to accumulate the historical compensation roll crown to the upper limit value and update the current compensation roll crown. After obtaining the compensation roll crown, initial bending roll force, and preset rolling force, proceed to step S13.

[0089] S13. Based on the compensation crown, obtain the compensation bending roll force of the current strip.

[0090] Specifically, since the bending roll force is used to control the crown of the strip, and there is a corresponding relationship between crown and bending roll force, the data model of the continuous rolling production line can currently input a compensation crown into the data model, and the data model will output a compensation bending roll force according to a preset calculation method. Of course, the compensation bending roll force can also be obtained by querying a preset difference table based on the corresponding relationship.

[0091] In one specific implementation, obtaining the compensating bending roll force of the current strip based on the compensating crown includes:

[0092] Get the width of the strip steel for the current specification;

[0093] According to the formula: To obtain the compensating bending force of the current strip steel. ,in, To preset the rolling force, For strip width, To compensate for convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

[0094] Specifically, those skilled in the art will understand that the deflection regression coefficient and calculation coefficient can be determined based on the continuous rolling production line, and the compensation bending roll force can be accurately calculated by the compensation crown using the above formula. After obtaining the compensation bending roll force, proceed to step S14.

[0095] S14. Obtain the rolling bending roll force based on the initial bending roll force and the compensation bending roll force.

[0096] Specifically, the initial bending roll force is the bending roll force obtained when the current strip cannot reach the target crown, and the compensating bending roll force is the bending roll force used to reduce the difference between the actual crown and the target crown. If the actual crown is less than the target crown, the rolling bending roll force is the sum of the initial bending roll force and the compensating bending roll force; if the actual crown is greater than the target crown, the rolling bending roll force is the difference between the initial bending roll force and the compensating bending roll force. After obtaining the rolling bending roll force, proceed to step S15.

[0097] S15. Roll the current strip steel according to the rolling bending roll force and the preset rolling force.

[0098] Specifically, the continuous rolling line rolls the current strip steel using a preset rolling force and controls the crown of the current strip steel using the rolling bending roll force to produce a strip steel that meets quality requirements. By implementing the crown control method of this invention, the crown control accuracy during the strip steel rolling process is improved.

[0099] The following embodiments of the present invention will be combined with Figure 2 This paper elaborates on how to improve the crown control accuracy of continuous rolling production lines. Taking A1 steel grade rolled on a multi-mode continuous casting and rolling production line as an example, the crown control pattern of the current strip when switching from continuous rolling mode to single coil mode is statistically analyzed to obtain the compensation crown. The target crown of the last strip in endless rolling of this steel grade is relatively small, generally 25μm, while the target crown of the first strip in single coil is large, generally 40μm. In this example, a total of 48 rolling periods were selected as samples. The average target crown of the first strip after mode switching was 43.3μm, and the average actual crown was 20.2μm, with an average crown hit rate of 38.3%. The actual crown was significantly smaller than the target crown, resulting in a very low hit rate. Among them, 42 rolling periods had actual crowns smaller than the target crown, accounting for 85.7%, indicating significant room for improvement in the crown hit rate. By developing a customized crown compensation function for different steel type mode switching, when the mode switching is triggered, the model automatically identifies it and automatically performs positive crown compensation for subsequent single coil strip steel, and applies bending roll force to the strip steel to improve the actual crown of the single coil.

[0100] The above-mentioned optimization design for A1 steel grade currently has a target average crown of 43.3 μm and an actual crown of 20.2 μm. Initially, a crown compensation value of 15 μm is given for the first roll of A1 steel grade in single-coil rolling mode switching. After accumulating multiple roll periods, the crown compensation function module continuously self-corrects the crown compensation value based on the actual rolling process characteristics and actual rolling conditions. For this steel grade, after accumulating 50 roll periods, the target average crown of the strip is 42.5 μm and the actual crown is 30.4 μm, with a crown hit rate of 78.6%. The deviation between the target crown and the actual crown has been improved. The crown compensation is then changed to 10 μm for the first roll of single-coil rolling mode switching. After accumulating 50 roll periods, the self-correction is repeated until more than 90% of the actual crown value of the single-coil strip falls within the crown tolerance zone. The optimal crown compensation value for different steel grades is then found, realizing the self-correction and self-optimization function.

[0101] The crown and hit rate of single coil strip steel were statistically analyzed for 43 different rolling mode switching methods, such as... Figure 3-4 The average target convexity of the first strip after mode switching was 42.7 μm, the average actual convexity was 43.7 μm, and the average convexity hit rate was 99.2%. The actual convexity of the single strip increased significantly, and the deviation from the target convexity became smaller and smaller, which greatly improved the hit rate of the strip.

[0102] Even without implementing the control method of this embodiment, taking the rolling of A1 steel in a continuous rolling mill as an example, 48 rolling rolls are selected as data analysis samples, such as... Figure 5-7 Of these, 42 roll periods had actual crown less than the target crown, accounting for 85.7%. This indicates that the actual crown in most roll periods was less than the target crown. The crown compensation value provided by the model during actual rolling was insufficient to ensure the actual crown fell within the required crown tolerance range, thus preventing crown control from being effective.

[0103] Based on the same inventive concept as the control method, embodiments of the present invention also provide a crown control device for a continuous rolling mill. Please refer to [link to relevant documentation]. Figure 8 The device includes:

[0104] The first acquisition module 801 is used to acquire the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode;

[0105] The determination module 802 is used to determine the compensation crown, initial bending roll force and preset rolling force of the current strip steel according to the current specifications.

[0106] The first obtaining module 803 is used to obtain the compensation bending roll force of the current strip steel based on the compensation crown.

[0107] The second obtaining module 804 is used to obtain the rolling bending roll force based on the initial bending roll force and the compensated bending roll force;

[0108] The rolling module 805 is used to roll the current strip steel according to the rolling bending roll force and the preset rolling force.

[0109] In an optional embodiment, the device further includes:

[0110] The second acquisition module is used to acquire the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel.

[0111] The third obtaining module is used to obtain the average convexity deviation based on all the target convexities and the actual convexities;

[0112] A storage module is used to store the average crown deviation as the compensation crown of the current strip.

[0113] In an optional embodiment, the device further includes:

[0114] The third acquisition module is used to acquire the convexity hit rate threshold and the convexity hit rate of historical preset periods;

[0115] The judgment module is used to determine whether the convexity hit rate is greater than the convexity hit rate threshold;

[0116] The update module is used to update the compensation convexity within the current preset period when the convexity hit rate is not greater than the convexity hit rate threshold, until the convexity hit rate is greater than the convexity hit rate threshold.

[0117] In one optional embodiment, the third acquisition module includes:

[0118] The first acquisition submodule is used to acquire the convexity deviation strip steel of the historical preset period, wherein the convexity deviation strip steel is the strip steel in all historical strip steel where the actual convexity is less than the target convexity;

[0119] The first obtaining submodule is used to obtain the convexity hit rate based on the convexity deviation strip and all historical strips.

[0120] In one optional embodiment, the update module includes:

[0121] The second acquisition submodule is used to acquire historical compensation convexity and preset convexity tolerance;

[0122] The second obtaining submodule is used to obtain the current convexity deviation based on the target convexity and the actual convexity;

[0123] The third obtaining submodule is used to obtain the convexity compensation value based on the preset convexity tolerance and the current convexity deviation;

[0124] The update submodule is used to update the historical compensated convexity to the current compensated convexity based on the convexity compensation value.

[0125] In an optional embodiment, the first obtaining module includes:

[0126] The third acquisition submodule is used to acquire the strip width of the current specification;

[0127] The fourth submodule is used to obtain the formula. Obtain the compensating bending roll force of the current strip. ,in, The preset rolling force, The width of the strip is... For the compensation convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

[0128] Based on the same inventive concept as the control method, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the control methods.

[0129] Based on the same inventive concept as the control method, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the control methods.

[0130] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0131] 1. The control method is based on the rolling characteristics of different steel grades. When switching from rolling the end block without a head to the first block of a single coil, the current specifications of the current strip are obtained in combination with the rolling rules of different steel grades. The compensation crown is determined according to the current specifications, and a customized compensation crown is given. The compensation crown is converted into the compensation bending roll force of the current strip. The rolling bending roll force obtained by the initial bending roll force and the compensation bending roll force is applied to the strip. When the current strip is rolled with the preset rolling force, the crown control capability and control accuracy are improved, which is of great significance for improving the overall strip shape quality.

[0132] 2. By judging whether the convexity hit rate is greater than the convexity hit rate threshold within a preset period, the compensation convexity is continuously corrected and optimized, thereby improving the accuracy of the compensation convexity and thus improving the convexity hit rate of the current strip steel.

[0133] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0134] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0135] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0137] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0138] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for controlling the crown of a continuous rolling mill, characterized in that, The method includes: Obtain the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode; Based on the current specifications, determine the compensation crown, initial bending roll force, and preset rolling force of the current strip. The compensation bending roll force of the current strip is obtained based on the compensation crown. The rolling bending roll force is obtained based on the initial bending roll force and the compensated bending roll force; The current strip is rolled according to the rolling bending roll force and the preset rolling force; Before determining the compensation crown of the current strip based on the current specifications, the method further includes: Obtain the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel; The average convexity deviation is obtained based on all the target convexities and the actual convexities. The average crown deviation is stored as the compensation crown of the current strip. Obtain the convexity hit rate threshold and the convexity hit rate for a historical preset period; Determine whether the convexity hit rate is greater than the convexity hit rate threshold; If not, update the compensation convexity within the current preset period until the convexity hit rate is greater than the convexity hit rate threshold. The step of obtaining the compensation bending roll force of the current strip based on the compensation crown includes: Obtain the width of the strip steel of the current specification; According to the formula Obtain the compensating bending roll force of the current strip. ,in, The preset rolling force, The width of the strip is... For the compensation convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

2. The crown control method for a continuous rolling mill according to claim 1, characterized in that, The process of obtaining the convexity hit rate for a historical preset period includes: Obtain the convexity deviation strip steel of the historical preset period, wherein the convexity deviation strip steel is the strip steel in all historical strip steel where the actual convexity is less than the target convexity; The convexity hit rate is obtained based on the convexity deviation strip and all historical strips.

3. The crown control method for a continuous rolling mill according to claim 1, characterized in that, The step of updating the compensation convexity within the current preset period includes: Obtain historical compensation convexity and preset convexity tolerance; The current convexity deviation is obtained based on the target convexity and the actual convexity. Based on the preset convexity tolerance and the current convexity deviation, the convexity compensation value is obtained; The historical compensated convexity is updated to the current compensated convexity based on the convexity compensation value.

4. The crown control method for a continuous rolling mill according to claim 1, characterized in that, The preset cycle is 40-50 historical strip rolling cycles.

5. A crown control device for a continuous rolling mill, characterized in that, The device includes: The first acquisition module is used to acquire the current specifications of the current strip steel, wherein the current strip steel is the first single coil strip steel rolled when the continuous rolling production line switches from continuous rolling mode to single coil mode; The determination module is used to determine the compensation crown, initial bending roll force and preset rolling force of the current strip steel according to the current specifications; The first obtaining module is used to obtain the compensation bending roll force of the current strip steel based on the compensation crown. The second obtaining module is used to obtain the rolling bending roll force based on the initial bending roll force and the compensated bending roll force; A rolling module is used to roll the current strip steel according to the rolling bending roll force and the preset rolling force; Before determining the compensation crown of the current strip based on the current specifications, the method further includes: Obtain the target crown and actual crown of all historical strip steel within a preset period, wherein the steel type and specifications of all historical strip steel are the same as those of the current strip steel; The average convexity deviation is obtained based on all the target convexities and the actual convexities. The average crown deviation is stored as the compensation crown of the current strip. Obtain the convexity hit rate threshold and the convexity hit rate for a historical preset period; Determine whether the convexity hit rate is greater than the convexity hit rate threshold; If not, update the compensation convexity within the current preset period until the convexity hit rate is greater than the convexity hit rate threshold. The step of obtaining the compensation bending roll force of the current strip based on the compensation crown includes: Obtain the width of the strip steel of the current specification; According to the formula Obtain the compensating bending roll force of the current strip. ,in, The preset rolling force, The width of the strip is... For the compensation convexity, is the deflection regression coefficient, and a and b are the calculated coefficients.

6. An electronic device, characterized in that, It includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-4.

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