Method for controlling starting thickness of twenty-high roll mill and related equipment

Abstract

The invention discloses a twenty-high rolling mill starting thickness control method and related equipment, and relates to the technical field of automatic thickness control of cold-rolled strip steel production. The method comprises the steps that the rigidity coefficient, the plasticity coefficient, the set rolling force and the actual rolling force of a rolling mill are obtained; calculating according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; calculating according to the rigidity coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjusting quantity; and controlling the starting thickness of the rolling mill according to the roll gap adjusting quantity. By means of the constant rolling force control mode, the roller gap is compensated by adjusting the action of the hydraulic cylinder, the starting rolling force is prevented from being reduced too much, the starting thickness control precision is effectively improved, the constant rolling force control mode is adopted for starting, the operation difficulty of operators can be effectively reduced, and the belt breaking probability is greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of automatic thickness control in cold-rolled strip production, and in particular to a starting thickness control method for a twenty-high rolling mill and related equipment. Background Art

[0002] At present, the thickness accuracy of strip steel is one of the important indicators to characterize its product quality. The strip steel thickness here refers to the thickness of each point on the center line of the strip steel along the length direction (also called longitudinal thickness). The cause of the thickness error of cold-rolled strip steel can be traced back to the previous process of pickling, preparation unit heating and even all the processes of hot rolling production.

[0003] However, the existing control method of a twenty-high rolling mill is as follows: when starting in one pass, the preset rolling force is much lower than the actual rolling force after starting, about 100 tons, which makes it very easy for the strip to break, and the broken strip is easy to damage the roller, seriously affecting the production rhythm and output. If the rolled steel types and specifications are relatively single, and the secondary model presets the starting rolling force relatively accurately, even if the starting rolling force drops by about 100 tons, the starting rolling force can be higher than the preset rolling force to compensate for the large drop in the starting rolling force. The operating difficulty of the operator is also relatively small, and the impact on production is not significant. If the rolled steel types and specifications are diverse, the impact on production is relatively large, and it is urgent to improve a more reasonable secondary rolling force preset and starting control method to solve the problem of easy strip breakage at the start. At present, there is no appropriate method to solve the above problems. Therefore, it is necessary to propose a starting thickness control method for a twenty-high rolling mill to at least solve some of the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, an embodiment of the present application provides a starting thickness control method for a twenty-high rolling mill, the method comprising: obtaining a stiffness coefficient, a plasticity coefficient, a set rolling force, and an actual rolling force of the rolling mill;

[0006] Calculating according to the set rolling force and the actual rolling force to obtain a rolling force deviation value;

[0007] Calculating according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount;

[0008] The starting thickness of the rolling mill is controlled according to the roll gap adjustment amount.

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

[0010] ΔP=P ref -P act ;

[0011] Among them, P ref To set the rolling force, P act is the actual rolling force.

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

[0013]

[0014] Among them, 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 amount comprises:

[0016] Get the rolling mill speed;

[0017] Determining the rolling mill speed and the actual rolling force;

[0018] When the rolling mill speed is within a preset speed range and the actual rolling force is within a preset rolling force range, starting a constant rolling force control mode;

[0019] When the constant rolling force control mode is started, 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 after starting the constant rolling force control mode include:

[0021] When the AGC function is detected to be activated, the constant rolling force control mode is turned off.

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

[0023]

[0024] Among them, P is the rolling force, h is the mill outlet thickness, and Δh is the change in mill outlet thickness.

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

[0026]

[0027] Where b is the strip width, k p is the average value of deformation impedance, k is the tension efficiency; D pis the friction coefficient; R' is the flattening radius of the working roll; H is the thickness at the mill entrance; h is the thickness at the mill exit; Z p is the rolling force adaptive coefficient.

[0028] In a second aspect, the present application proposes a starting thickness control system for a twenty-high rolling 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 according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; calculate according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount;

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

[0032] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of a twenty-roll mill starting thickness control method as described in any one of the first aspects above when executing the computer program stored in the memory.

[0033] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of a method for generating starting thickness control of a twenty-high rolling mill according to any one of the first aspects are implemented.

[0034] In summary, a starting thickness control method for a twenty-high rolling mill in an embodiment of the present application includes: obtaining the stiffness coefficient, plasticity coefficient, set rolling force and actual rolling force of the rolling mill; calculating according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; calculating according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount; and controlling the starting thickness of the rolling mill according to the roll gap adjustment amount. By using a constant rolling force control method, the roll gap is compensated by adjusting the action of the hydraulic cylinder to avoid excessive drop in the starting rolling force, so as to effectively improve the starting thickness control accuracy. Starting by using a constant rolling force control method can effectively reduce the operating difficulty of the operator and greatly reduce the probability of strip breakage.

[0035] The starting thickness control method of a twenty-high rolling mill proposed in this application, and other advantages, objectives and features of this application will be reflected in part through the following description, and in part will also be understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 A schematic diagram of a process flow of a starting thickness control method for a twenty-high rolling mill provided in an embodiment of the present application;

[0038] Figure 2 A timing diagram of the constant rolling force function in the starting thickness control method of a twenty-high rolling mill is proposed for this application;

[0039] Figure 3 A schematic diagram of the structure of a starting thickness control system for a twenty-high rolling mill provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of an electronic device for starting thickness control of a twenty-high rolling mill provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through 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 article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0043] See also Figure 1 , which is a schematic flow diagram of a starting thickness control method for a twenty-high rolling mill provided in an embodiment of the present application, which may specifically include:

[0044] S110, obtaining 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 rolling mill, and the set rolling force P of the rolling mill are collected. ref and the actual rolling force P of the rolling mill act Among them, the stiffness coefficient M of the rolling mill refers to the force required for the rolling mill to undergo elastic deformation of 1 mm, and the unit is kN / mm; the stiffness coefficient Q of the rolling mill refers to the force required to cause the rolled strip to deform by 1 mm, and the unit is kN / mm.

[0046] S120, calculating according to the set rolling force and the actual rolling force to obtain a rolling force deviation value;

[0047] For example, the rolling force P is set ref Refers to the rolling force set value calculated and issued according to the secondary model, the actual rolling force P act It refers to the rolling force deviation value obtained by calculating the actual rolling force value detected by the pressure measuring head instrument based on the set rolling force and the actual rolling force.

[0048] S130, calculating according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount;

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

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

[0051] Exemplarily, the obtained roll gap adjustment amount can be used to control the thickness of the rolling mill at the beginning of production. For example, if the roll gap adjustment amount is relatively large, then the starting thickness of the rolling mill may need to be adjusted thicker or thinner. The specific adjustment requires determining whether the gap adjustment amount is increased or decreased. This is to allow the rolling mill to have a more suitable thickness at the beginning of production, to ensure that the subsequent production process can proceed smoothly, and to produce good quality products. The obtained roll gap adjustment amount outputs the control instruction to the roll gap adjustment hydraulic cylinder through the PLC controller to control its action. The roll gap adjustment hydraulic cylinder is an actuator used to adjust the size of the roll gap of the rolling mill. By changing the stroke of the hydraulic cylinder, the gap between the rollers can be changed, thereby controlling the thickness of the rolled piece during the rolling process.

[0052] In summary, the starting thickness control method of the twenty-high rolling mill proposed in the embodiment of the present application compensates for the roll gap by adjusting the action of the hydraulic cylinder to avoid excessive drop in the starting rolling force, thereby effectively improving the starting thickness control accuracy. Starting in a constant rolling force control manner can effectively reduce the operating difficulty of the operator and greatly reduce the probability of strip breakage.

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

[0054] ΔP=P ref -P act (1);

[0055] Among them, P ref To set the rolling force, P act is the actual rolling force.

[0056] For example, the set rolling force is the force that should be used for rolling, which is determined in advance according to 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, and the number we get is called the rolling force deviation value. For example, we originally planned to use 1000 force to roll something, but only 980 force was used in actual production. Then we use 1000 minus 980, which equals 20, and this 20 is the rolling force deviation value.

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

[0058]

[0059] Among them, M is the stiffness coefficient and Q is the plasticity coefficient.

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

[0061] In some examples, the step of controlling the starting thickness of the rolling mill according to the roll gap adjustment amount includes:

[0062] Get the rolling mill speed;

[0063] Determining the rolling mill speed and the actual rolling force;

[0064] When the rolling mill speed is within a preset speed range and the actual rolling force is within a preset rolling force range, starting a constant rolling force control mode;

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

[0066] Exemplarily, it is first necessary to determine the speed value of the current rolling mill operation, which may affect subsequent control decisions. Then the two key parameters of the rolling mill speed and the actual rolling force are evaluated. Determine whether they are within the preset speed range and the preset rolling force range, respectively, where the preset speed range is greater than 30 mpm and the preset rolling force range is less than 1,000 tons. If the rolling mill speed meets the requirements of the preset speed range and the actual rolling force is also within the preset rolling force range, the constant rolling force control mode is started. The constant rolling force control mode is usually used to keep the rolling force relatively stable during the rolling process to ensure the consistency of product quality. Once the constant rolling force control mode is entered, the starting thickness of the rolling mill is adjusted according to the previously determined roll gap adjustment amount. By adjusting the roll gap, the degree of deformation of the rolled piece during the rolling process can be changed, thereby achieving control of the starting thickness to meet production requirements.

[0067] In some examples, the steps after starting the constant rolling force control mode include:

[0068] When the AGC function is detected to be activated, the constant rolling force control mode is turned off.

[0069] For example, Figure 2 As shown, this is a timing diagram of the constant rolling force function in the starting thickness control method of a twenty-high rolling mill proposed in this application. It can be seen that before the AGC function is put into operation, the constant rolling force takes effect when the input conditions are met. When the AGC function is put into operation, the constant rolling force control function will be automatically cut off. After the constant rolling force control mode is started, it will be continuously monitored whether a specific situation occurs. If it is detected that the automatic thickness control (AGC) function is put into use, the constant rolling force control mode is turned off. When any of the various types of AGC functions (such as feedforward AGC, feedback AGC, second flow AGC, etc.) is put into use, the constant rolling force function will be automatically stopped. This is because the AGC function is mainly to control the thickness of the strip, and the constant rolling force function is mainly to keep the rolling force constant. These two functions may conflict with each other in some cases, so such a setting is required to ensure the stable operation of the system.

[0070] When there is no constant rolling force function, the hydraulic cylinder in the hydraulic system does not make any action adjustments. This means that the gap between the rollers (roller gap) will not be automatically adjusted due to changes in the rolling force. Due to the lack of adjustment of the constant rolling force function, the rolling force will drop significantly, about 100 tons. The change in rolling force will directly affect the degree of deformation of the rolled piece, and then affect the thickness of the product. When the rolling force drops significantly, the pressure on the rolled piece decreases, and the degree of deformation also changes, making it difficult to control the product thickness within a precise range. The instability of the rolling force will also increase the risk of strip breakage. When the rolling force drops significantly, the clamping force of the rollers on the rolled piece decreases, which may cause the rolled piece to slip or deviate during the rolling process. In severe cases, a strip breakage accident may occur.

[0071] When the constant rolling force function is put into use, the hydraulic system will automatically control the action of the hydraulic cylinder according to the change of rolling force. This means that when the rolling force changes, the hydraulic cylinder will adjust the roll gap to maintain the stability of the rolling force. The constant rolling force function adjusts the roll gap by controlling the action of the hydraulic cylinder to compensate for the change of rolling force. This compensation effect can keep the rolling force at a relatively stable level and reduce the impact of rolling force fluctuations on product quality and production process. Due to the investment of the constant rolling force function, the decline in rolling force has been effectively controlled. The hydraulic cylinder will move to compensate for the roll gap adjustment amount. The rolling force decline is small, about 20 tons. The constant rolling force function reduces the slip and deviation of the rolled piece during the rolling process by maintaining the stability of the rolling force, thereby reducing the risk of strip breakage. The investment of the constant rolling force function makes the rolling process more stable. The stability of the rolling force helps to ensure the consistency of indicators such as product thickness accuracy and surface quality, and also reduces the impact and damage to the equipment caused by rolling force fluctuations.

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

[0073]

[0074] Among them, P is the rolling force, h is the mill outlet thickness, and Δh is the change in mill outlet thickness.

[0075] For example, in general, the higher the hardness and strength of the material, the greater the plasticity coefficient Q. This is because materials with high hardness and strength require greater force to overcome the internal atomic bonding force during rolling, thereby producing plastic deformation. For example, high-hardness tool steel requires greater rolling force than ordinary carbon steel during rolling, and its plasticity coefficient is correspondingly larger. On the contrary, the lower the hardness and strength of the 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]

[0078] Where b is the strip width, k p is the average value of deformation impedance, k is the tension efficiency; D p is the friction coefficient; R' is the flattening radius of the working roll; H is the thickness at the mill entrance; h is the thickness at the mill exit; Z p is the rolling force adaptive coefficient.

[0079] For example, during the rolling process, the metal will undergo plastic deformation, which requires external force to overcome the interatomic bonding force and lattice resistance inside the metal. The main function of the rolling force is to provide this external force so that the metal can be deformed into a predetermined shape and size. For example, in sheet rolling, when the roller applies pressure to the sheet, the metal crystals inside the sheet slip and dislocation movement occur, thereby reducing the thickness and increasing the length. In this process, the rolling force must be large enough to overcome the deformation resistance of the metal, otherwise effective rolling cannot be achieved. The setting calculation of the rolling force P is sent to the first-level PLC according to the model calculation at the process automation level (L2), and the formula is shown in formula (4).

[0080] This application is a method of using a constant rolling force control method after rolling starts and before the AGC control function is put into use. The roller gap is compensated by adjusting the action of the hydraulic cylinder to avoid excessive drop in the starting rolling force, so as to effectively improve the starting thickness control accuracy. The types and specifications of rolled steel are diverse, and the starting rolling force drop varies greatly, which is difficult to predict. The operation is difficult, and the starting thickness control is difficult to ensure, which can easily cause strip breakage. The use of constant rolling force starting can effectively reduce the operating difficulty of the operator and greatly reduce the probability of strip breakage. Optimizing and improving the process automation level 2 (L2) parameters so that the preset rolling force and the starting rolling force are equal, is more conducive to the operator to ensure the stability of rolling production at the start of rolling, and is conducive to the development and research of new products and the improvement of production capacity and economic benefits. The present invention has a wide range of application and promotion value, especially for twenty-roll mill production lines with large starting rolling force, producing multiple steel types, multiple specifications, and ultra-thin strips.

[0081] like Figure 3 As shown, the present application proposes a starting thickness control system for a twenty-high rolling 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 according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; calculate according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount;

[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 the above-mentioned system when applying the above-mentioned method can be found in the description of the above-mentioned method embodiment, which will not be repeated here.

[0086] like Figure 4 As shown, an embodiment of the present application 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, and when the processor 320 executes the computer program 311, the steps of any method of starting thickness control of the twenty-roll mill are implemented.

[0087] Since the electronic device introduced in this embodiment is a device used to implement a starting thickness control device of a twenty-roll mill in the embodiment of the present application, based on the method introduced in the embodiment of the present application, the technical personnel in this field can understand the specific implementation mode of the electronic device of the present embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application is not introduced in detail here. As long as the equipment used by the technical personnel in this field to implement the method in the embodiment of the present application is within the scope of protection of this application.

[0088] In the specific implementation process, when the computer program 311 is executed by the processor, it can achieve Figure 1 Any implementation manner in the corresponding embodiments.

[0089] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0091] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0092] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0093] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0094] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of the LDPC decoding method of the solid-state hard disk controller.

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

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

[0097] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

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

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0100] If the integrated unit is implemented in the form of 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 the present application is essentially 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, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0101] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0102] Although the preferred embodiments of this specification 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 this specification.

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

Claims

1. A method for controlling the starting thickness of a twenty-high rolling mill, characterized in that: The method comprises: Obtain the stiffness coefficient, plasticity coefficient, set rolling force and actual rolling force of the rolling mill; Calculating according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; Calculating according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount; The starting thickness of the rolling mill is controlled according to the roll gap adjustment amount.

2. A method for controlling starting thickness of a twenty-high rolling mill according to claim 1, characterized in that: The rolling force deviation value is expressed as: ΔP=P ref -P act ; Among them, P ref To set the rolling force, P act is the actual rolling force.

3. A method for controlling starting thickness of a twenty-high rolling mill according to claim 1, characterized in that: The roll gap adjustment amount is expressed as: Among them, M is the stiffness coefficient and Q is the plasticity coefficient.

4. A method for controlling starting thickness of a twenty-high rolling mill according to claim 1, characterized in that: The step of controlling the starting thickness of the rolling mill according to the roll gap adjustment amount comprises: Get the rolling mill speed; Determining 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 preset rolling force range, starting a constant rolling force control mode; When the constant rolling force control mode is started, the starting thickness of the rolling mill is controlled according to the roll gap adjustment amount.

5. A method for controlling starting thickness of a twenty-high rolling mill according to claim 4, characterized in that: The steps after starting the constant rolling force control mode include: When the AGC function is detected to be activated, the constant rolling force control mode is turned off.

6. A method for controlling starting thickness of a twenty-high rolling mill according to claim 1, characterized in that: The plasticity coefficient is expressed as: Among them, P is the rolling force, h is the mill outlet thickness, and Δh is the change in mill outlet thickness.

7. A method for controlling starting thickness of a twenty-high rolling mill according to claim 6, characterized in that: The rolling force is expressed as: Where b is the strip width, k p is the average value of deformation impedance, k is the tension efficiency; D p is the friction coefficient; R' is the flattening radius of the working roll; H is the thickness at the mill entrance; h is the thickness at the mill exit; Z p is the rolling force adaptive coefficient.

8. A twenty-high rolling mill starting thickness control system, characterized in that: The system comprises: 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 according to the set rolling force and the actual rolling force to obtain a rolling force deviation value; calculate according to the stiffness coefficient, the plasticity coefficient and the rolling force deviation value to obtain a roll gap adjustment amount; The control module is configured to control the starting thickness of the rolling mill according to the roll gap adjustment amount.

9. An electronic device, comprising: A memory and a processor, characterized in that the processor is used to implement the steps of a twenty-high mill starting thickness control method as described in any one of claims 1-7 when executing a computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for controlling the starting thickness of a twenty-high rolling mill as described in any one of claims 1 to 7 are implemented.

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