A method and related equipment for controlling the starting thickness of a 20-roll rolling mill

Abstract

This application discloses a method and related equipment for controlling the starting thickness of a 20-roll rolling mill, relating to the field of automatic thickness control technology in cold-rolled strip steel production. The method includes: acquiring the mill's stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force; calculating a rolling force deviation value based on the set rolling force and the actual rolling force; calculating a roll gap adjustment amount based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value; and controlling the starting thickness of the mill based on the roll gap adjustment amount. By using constant rolling force control and compensating for the roll gap through adjusting the hydraulic cylinder's action, excessive drops in starting rolling force are avoided, effectively improving the accuracy of starting thickness control. Starting with constant rolling force control can effectively reduce the operator's operational difficulty and significantly reduce the probability of strip breakage.

Description

Technical Field

[0001] This application relates to the field of automatic thickness control technology in cold-rolled strip steel production, and in particular to a method and related equipment for controlling the starting thickness of a 20-roll mill. Background Technology

[0002] Currently, the thickness accuracy of strip steel is one of the important indicators characterizing its product quality. Here, strip steel thickness refers to the thickness at each point along the centerline of the strip steel along its length (also known as longitudinal thickness). The causes of thickness errors in cold-rolled strip steel can be traced back to all processes in the preceding pickling, preheating of the preparation unit, and even hot continuous rolling production.

[0003] However, the existing control method for a certain 20-roll mill is as follows: during the first pass start-up, the difference between the preset rolling force and the actual starting force is very large, approximately 100 tons, which easily leads to strip breakage. Strip breakage damages the rolls, severely affecting production rhythm and output. If the rolled steel grades and specifications are relatively simple, and the secondary model's preset starting rolling force is relatively accurate, even if the starting rolling force drops by about 100 tons, a higher starting rolling force than the preset rolling force can be used to compensate for the large drop in starting rolling force. The operation difficulty for operators is also relatively small, and the impact on production is not significant. If the rolled steel grades and specifications are diverse, the impact on production is significant, and there is an urgent need to improve the secondary rolling force preset and starting control method to solve the problem of easy strip breakage during starting. Currently, there is no suitable method to solve the above problems. Therefore, it is necessary to propose a starting thickness control method for a 20-roll mill to at least solve some of the above problems. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, embodiments of this application provide a method for controlling the starting thickness of a 20-roll mill, the method comprising: obtaining the mill's stiffness coefficient, plasticity coefficient, setting the rolling force, and the actual rolling force;

[0006] The rolling force deviation value is calculated based on the set rolling force and the actual rolling force.

[0007] The roll gap adjustment amount is calculated based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value.

[0008] The starting thickness of the rolling mill is controlled based on the roll gap adjustment.

[0009] In one embodiment of the present invention, the rolling force deviation value is expressed as:

[0010] ;

[0011] in, To set the rolling force, This represents the actual rolling force.

[0012] In one embodiment of the present invention, the roll gap adjustment amount is expressed as:

[0013] ;

[0014] Where M is the stiffness coefficient and Q is the plasticity coefficient.

[0015] In one embodiment of the present invention, the step of controlling the starting thickness of the rolling mill according to the roll gap adjustment includes:

[0016] Obtain the mill speed;

[0017] The mill speed and the actual rolling force are determined.

[0018] When the mill speed is within the preset speed range and the actual rolling force is within the set rolling force range, the constant rolling force control mode is activated.

[0019] When the constant rolling force control mode is activated, the starting thickness of the rolling mill is controlled according to the roll gap adjustment amount.

[0020] In one embodiment of the present invention, the steps following the activation of the constant rolling force control mode include:

[0021] If the AGC function is detected to be in operation, the constant rolling force control mode will be turned off.

[0022] In one embodiment of the present invention, the plasticity coefficient is expressed as:

[0023] ;

[0024] in, For rolling force, For the thickness at the mill exit, This represents the change in thickness at the mill exit.

[0025] In one embodiment of the present invention, the rolling force is expressed as:

[0026] ;

[0027] in, For strip width, The average value of the deformation impedance. For tension efficiency; The friction influence coefficient; The flattening radius of the work roll; This refers to the thickness at the mill inlet. This refers to the thickness at the mill exit. This is the adaptive coefficient for rolling force.

[0028] Secondly, this application proposes a starting thickness control system for a 20-roll mill, the system comprising: a data acquisition module, a calculation module, and a control module;

[0029] The data acquisition module is configured to acquire the stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force of the rolling mill.

[0030] The calculation module is configured to: calculate the rolling force deviation value based on the set rolling force and the actual rolling force; and calculate the roll gap adjustment amount based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value.

[0031] The control module is configured to control the starting thickness of the rolling mill based on the roll gap adjustment amount.

[0032] Thirdly, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of a 20-roll mill start-up thickness control method as described in any of the first aspects above.

[0033] Fourthly, this application also proposes a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the twenty-roll mill start-up thickness control generation method of any one of the first aspects.

[0034] In summary, the starting thickness control method for a 20-roll rolling mill according to an embodiment of this application includes: obtaining the mill's stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force; calculating a rolling force deviation value based on the set rolling force and the actual rolling force; calculating a roll gap adjustment amount based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value; and controlling the starting thickness of the rolling mill based on the roll gap adjustment amount. By using constant rolling force control, the roll gap is compensated by adjusting the hydraulic cylinder's action, avoiding excessive drop in starting rolling force, thereby effectively improving the starting thickness control accuracy. Using constant rolling force control for starting can effectively reduce the operator's operational difficulty and significantly reduce the probability of strip breakage.

[0035] The starting thickness control method for a 20-roll mill proposed in this application, along with other advantages, objectives, and features of this application, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a flowchart illustrating a method for controlling the starting thickness of a 20-roll mill, as provided in an embodiment of this application.

[0038] Figure 2 This application proposes a timing diagram for the constant rolling force function in a method for controlling the starting thickness of a 20-roll mill.

[0039] Figure 3 This application provides a schematic diagram of the structure of a 20-roll mill starting thickness control system.

[0040] Figure 4 This is a schematic diagram of an electronic device for controlling the starting thickness of a 20-roll mill, provided as an embodiment of this application. Detailed Implementation

[0041] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0042] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0043] Please see Figure 1 This is a flowchart illustrating a method for controlling the starting thickness of a 20-roll mill, provided in an embodiment of this application. Specifically, it may include:

[0044] S110. Obtain the stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force of the rolling mill;

[0045] For example, the stiffness coefficient M of the rolling mill, the plasticity coefficient Q of the strip, and the set rolling force P of the rolling mill are collected. ref And the actual rolling force P of the rolling mill act The mill stiffness coefficient M refers to the force required for the mill to undergo 1 mm of elastic deformation, and the unit is kN / mm. The strip plasticity coefficient Q refers to the force required to cause the rolled strip to deform by 1 mm, and the unit is kN / mm.

[0046] S120. Calculate the rolling force deviation value based on the set rolling force and the actual rolling force;

[0047] For example, setting the rolling force P ref This refers to the rolling force setpoint calculated and issued based on the secondary model, and the actual rolling force P. act This refers to calculating the rolling force deviation value based on the actual rolling force detected by the pressure gauge and the set rolling force and the actual rolling force.

[0048] S130. The roll gap adjustment amount is calculated based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value.

[0049] For example, the stiffness coefficient and plasticity coefficient are fixed values ​​obtained above, representing different characteristics. The rolling force deviation value is calculated based on the set rolling force and the actual rolling force. By calculating the stiffness coefficient, plasticity coefficient, and rolling force deviation value, the roll gap adjustment amount is obtained. The roll gap adjustment amount is used to adjust the size of the roll gap during production. If the roll gap is adjusted properly, rolling production can be carried out more effectively, ensuring product quality and production efficiency.

[0050] S140. Control the starting thickness of the rolling mill according to the roll gap adjustment amount.

[0051] For example, the obtained roll gap adjustment amount can be used to control the thickness of the rolling mill at the beginning of production. For instance, if the roll gap adjustment amount is large, the initial thickness of the rolling mill may need to be adjusted to be thicker or thinner; the specific adjustment depends on whether the roll gap adjustment amount is increased or decreased. This is to ensure that the rolling mill has a suitable thickness at the beginning of production, guaranteeing smooth operation of subsequent production processes and the production of high-quality products. The obtained roll gap adjustment amount is transmitted to the roll gap adjusting hydraulic cylinder via a PLC controller, which then controls its operation. The roll gap adjusting hydraulic cylinder is an actuator used to adjust the roll gap size of the rolling mill. By changing the stroke of the hydraulic cylinder, the gap between the rolls can be changed, thereby controlling the thickness of the rolled product during the rolling process.

[0052] In summary, the starting thickness control method for a 20-roll mill proposed in this application compensates for the roll gap by adjusting the hydraulic cylinder action, thereby avoiding an excessive drop in starting rolling force and effectively improving the starting thickness control accuracy. The use of constant rolling force control for starting can effectively reduce the operational difficulty for operators and greatly reduce the probability of strip breakage.

[0053] In some examples, the rolling force deviation value is expressed as:

[0054] (1);

[0055] in, To set the rolling force, This represents the actual rolling force.

[0056] For example, the set rolling force is a predetermined amount of force to be used for rolling based on production requirements and various conditions. The actual rolling force is the force actually used by the rolling mill during the actual production process. We subtract the actual rolling force from the set rolling force; the resulting number is called the rolling force deviation value. For instance, if we originally planned to use 1000 force to roll something, but only 980 force was actually used during production, then we subtract 980 from 1000, which equals 20. This 20 is the rolling force deviation value.

[0057] In some examples, the roll gap adjustment is expressed as:

[0058] (2);

[0059] Where M is the stiffness coefficient and Q is the plasticity coefficient.

[0060] For example, the roll gap adjustment is calculated based on the stiffness coefficient, plasticity coefficient, and rolling force deviation value.

[0061] In some examples, the step of controlling the mill starting thickness based on the roll gap adjustment includes:

[0062] Obtain the mill speed;

[0063] The mill speed and the actual rolling force are determined.

[0064] When the mill speed is within the preset speed range and the actual rolling force is within the set rolling force range, the constant rolling force control mode is activated.

[0065] When the constant rolling force control mode is activated, the starting thickness of the rolling mill is controlled according to the roll gap adjustment amount.

[0066] For example, the first step is to determine the current operating speed of the rolling mill, as this speed may affect subsequent control decisions. Next, the two key parameters—rolling mill speed and actual rolling force—are evaluated. It is determined whether they are within the preset speed range and the set rolling force range, respectively. The preset speed range is greater than 30 mpm, and the set rolling force range is less than 1000 tons. If the rolling mill speed meets the preset speed range requirements, and the actual rolling force is also within the set rolling force range, the constant rolling force control mode is activated. The constant rolling force control mode is typically used to maintain a relatively stable rolling force during rolling to ensure consistent product quality. Once in constant rolling force control mode, the starting thickness of the rolling mill is adjusted based on the previously determined roll gap adjustment. By adjusting the roll gap, the degree of deformation of the workpiece during rolling can be changed, thereby controlling the starting thickness to meet production requirements.

[0067] In some examples, the steps following the activation of the constant rolling force control mode include:

[0068] If the AGC function is detected to be in operation, the constant rolling force control mode will be turned off.

[0069] For example, such as Figure 2The diagram shows the timing sequence of the constant rolling force function activation in the 20-roll mill start-up thickness control method proposed in this application. It can be seen that before the AGC function is activated, the constant rolling force operates under the condition that the activation conditions are met. Once the AGC function is activated, the constant rolling force control function is automatically deactivated. After the constant rolling force control mode is activated, it continuously monitors for specific situations. If the Automatic Thickness Control (AGC) function is detected, the constant rolling force control mode is deactivated. When any of the various types of AGC functions (such as feedforward AGC, feedback AGC, and flow rate AGC) are activated, the constant rolling force function is automatically stopped. This is because the AGC function is mainly for controlling the strip thickness, while the constant rolling force function is mainly for maintaining a constant rolling force. These two functions may conflict in some situations, so this setting is necessary to ensure the stable operation of the system.

[0070] Without a constant rolling force function, the hydraulic cylinders in the hydraulic system do not adjust their movement. This means the gap between the rolls (roll gap) will not automatically adjust due to changes in rolling force. Without the constant rolling force function, the rolling force will drop significantly, approximately 100 tons. This change in rolling force directly affects the deformation of the rolled piece, and consequently, the product thickness. When the rolling force drops significantly, the pressure on the rolled piece decreases, and the degree of deformation changes, making it difficult to control the product thickness within a precise range. Unstable rolling force also increases the risk of strip breakage. When the rolling force drops significantly, the clamping force of the rolls on the rolled piece decreases, which may cause the rolled piece to slip or deviate during rolling, potentially leading to strip breakage in severe cases.

[0071] When the constant rolling force function is activated, the hydraulic system automatically controls the movement of the hydraulic cylinders based on changes in rolling force. This means that when the rolling force changes, the hydraulic cylinders adjust the roll gap to maintain stability. The constant rolling force function compensates for changes in rolling force by controlling the movement of the hydraulic cylinders to adjust the roll gap. This compensation keeps the rolling force at a relatively stable level, reducing the impact of rolling force fluctuations on product quality and the production process. Due to the constant rolling force function, the decrease in rolling force is effectively controlled. The hydraulic cylinders move to compensate for the roll gap adjustment, resulting in a small decrease in rolling force, approximately 20 tons. By maintaining stable rolling force, the constant rolling force function reduces slippage and deviation of the workpiece during rolling, thereby reducing the risk of strip breakage. The constant rolling force function makes the rolling process more stable. Stable rolling force helps ensure the consistency of product thickness accuracy, surface quality, and other indicators, while also reducing the impact and damage to equipment caused by rolling force fluctuations.

[0072] In some examples, the plasticity coefficient is expressed as:

[0073] (3);

[0074] in, For rolling force, For the thickness at the mill exit, This represents the change in thickness at the mill exit.

[0075] For example, generally speaking, the higher the hardness and strength of a material, the greater its plasticity coefficient Q. This is because materials with high hardness and strength require greater force to overcome the interatomic bonding forces during rolling, thus resulting in plastic deformation. For instance, high-hardness tool steel requires greater rolling force than ordinary carbon steel during rolling, and its plasticity coefficient is correspondingly larger. Conversely, the lower the hardness and strength of a material, the easier it is for plastic deformation to occur, and the smaller the plasticity coefficient Q.

[0076] In some examples, the rolling force is expressed as:

[0077] (4);

[0078] in, For strip width, The average value of the deformation impedance. For tension efficiency; The friction influence coefficient; The flattening radius of the work roll; This refers to the thickness at the mill inlet. This refers to the thickness at the mill exit. This is the adaptive coefficient for rolling force.

[0079] For example, metals undergo plastic deformation during rolling, requiring external force to overcome the interatomic bonding forces and lattice resistance within the metal. The primary function of rolling force is to provide this external force, causing the metal to deform into a predetermined shape and size. For instance, in sheet metal rolling, when rolls apply pressure to the sheet, slip and dislocation movement occur within the metal crystals, resulting in a reduction in thickness and an increase in length. In this process, the rolling force must be sufficiently large to overcome the metal's resistance to deformation; otherwise, effective rolling cannot be achieved. Rolling force The setting calculation is performed by the process automation level (L2) based on the model calculation and then issued to the first-level PLC, as shown in formula (4).

[0080] This application employs a constant rolling force control method after the rolling start and before the AGC control function is activated. By adjusting the hydraulic cylinder's movement to compensate for the roll gap, it avoids excessive drop in starting rolling force, effectively improving the accuracy of starting thickness control. Rolling various steel grades and specifications results in significant variations in starting rolling force, making it difficult to predict, operationally challenging, and difficult to guarantee starting thickness control, easily leading to strip breakage. Using constant rolling force for starting effectively reduces the operational difficulty for operators and greatly reduces the probability of strip breakage. Optimizing and improving the process automation level 2 (L2) parameters to ensure that the set rolling force and starting rolling force are equal further facilitates operators in ensuring the stability of rolling production during the rolling start, which is beneficial for new product development and improving production capacity and economic efficiency. This invention has broad application and promotion value, especially for 20-roll rolling mill production lines with high starting rolling force, producing multiple steel grades, specifications, and extremely thin strips.

[0081] like Figure 3 As shown, this application proposes a starting thickness control system for a 20-roll mill, the system comprising: a data acquisition module 21, a calculation module 22, and a control module 23;

[0082] The data acquisition module 21 is configured to acquire the stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force of the rolling mill.

[0083] The calculation module 22 is configured to: calculate the rolling force deviation value based on the set rolling force and the actual rolling force; and calculate the roll gap adjustment amount based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value.

[0084] The control module 23 is configured to control the starting thickness of the rolling mill according to the roll gap adjustment amount.

[0085] The effects of applying the aforementioned method in the above system can be found in the description of the aforementioned method embodiments, and will not be repeated here.

[0086] like Figure 4 As shown, this application embodiment also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements the steps of any of the above-described methods for controlling the starting thickness of a twenty-roll mill.

[0087] Since the electronic device described in this embodiment is the device used to implement the starting thickness control device for a 20-roll mill in this application embodiment, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in this application embodiment. Therefore, how the electronic device implements the method in this application embodiment will not be described in detail here. Any device used by those skilled in the art to implement the method in this application embodiment is within the scope of protection of this application.

[0088] In practical implementation, when the computer program 311 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0089] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0091] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. 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, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0092] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0093] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0094] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to execute the LDPC decoding method of a solid-state drive controller.

[0095] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0096] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0098] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0099] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0100] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0101] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0102] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0103] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for controlling the starting thickness of a 20-roll rolling mill, characterized in that, The method includes: Obtain the stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force of the rolling mill; The rolling force deviation value is calculated based on the set rolling force and the actual rolling force. The roll gap adjustment amount is calculated based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value. The starting thickness of the rolling mill is controlled according to the roll gap adjustment amount; the step of controlling the starting thickness of the rolling mill according to the roll gap adjustment amount includes: obtaining the rolling mill speed; judging the rolling mill speed and the actual rolling force; when the rolling mill speed is within a preset speed range and the actual rolling force is within a set rolling force range, starting the constant rolling force control mode; when the constant rolling force control mode is started, controlling the starting thickness of the rolling mill according to the roll gap adjustment amount; the steps after starting the constant rolling force control mode include: when the AGC function is detected to be engaged, disabling the constant rolling force control mode.

2. The method for controlling the starting thickness of a 20-roll mill according to claim 1, characterized in that, The rolling force deviation value is expressed as: ； in, To set the rolling force, This represents the actual rolling force.

3. The method for controlling the starting thickness of a 20-roll mill according to claim 1, characterized in that, The roll gap adjustment amount is expressed as: ； Where M is the stiffness coefficient and Q is the plasticity coefficient.

4. The method for controlling the starting thickness of a 20-roll mill according to claim 1, characterized in that, The plasticity coefficient is expressed as: ； in, For rolling force, For the thickness at the mill exit, This represents the change in thickness at the mill exit.

5. The method for controlling the starting thickness of a 20-roll mill according to claim 4, characterized in that, The rolling force is expressed as: ； in, For strip width, The average value of the deformation impedance. For tension efficiency; The friction influence coefficient; The flattening radius of the work roll; This refers to the thickness at the mill inlet. This refers to the thickness at the mill exit. This is the adaptive coefficient for rolling force.

6. A starting thickness control system for a 20-roll rolling mill, characterized in that, The system includes: a data acquisition module, a calculation module, and a control module; The data acquisition module is configured to acquire the stiffness coefficient, plasticity coefficient, set rolling force, and actual rolling force of the rolling mill. The calculation module is configured to: calculate the rolling force deviation value based on the set rolling force and the actual rolling force; and calculate the roll gap adjustment amount based on the stiffness coefficient, the plasticity coefficient, and the rolling force deviation value. The control module is configured to: control the starting thickness of the rolling mill according to the roll gap adjustment; the step of controlling the starting thickness of the rolling mill according to the roll gap adjustment includes: acquiring the rolling mill speed; judging the rolling mill speed and the actual rolling force; when the rolling mill speed is within a preset speed range and the actual rolling force is within a set rolling force range, activating the constant rolling force control mode; when the constant rolling force control mode is activated, controlling the starting thickness of the rolling mill according to the roll gap adjustment; the steps after activating the constant rolling force control mode include: deactivating the constant rolling force control mode when the AGC function is detected to be engaged.

7. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of a twenty-roll mill start-up thickness control method as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the starting thickness control method for a 20-roll mill as described in any one of claims 1-5.

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