Control method, device and readable storage medium of rolling mill

Abstract

The application discloses a rolling mill control method, device and readable storage medium, and relates to the technical field of hot continuous rolling. The rolling mill control method comprises the following steps: in the process of rolling steel by a rolling mill, preset rolling parameters of the steel are acquired, a measured value of a bending roll force of a first rack, a rolling speed correction rate and a rolling speed reference value are acquired, and the first rack is any rolling mill in a plurality of racks; a constant force setting value of the first rack is determined according to the preset rolling parameters; a target value of the bending roll force of the first rack is determined according to the measured value of the bending roll force and the constant force setting value; a target value of the rolling speed of the first rack is determined according to the rolling speed correction rate and the rolling speed reference value; and the first rack is controlled to roll the steel according to the target value of the bending roll force and the target value of the rolling speed. The application improves the operation stability of the rolling mill.

Description

Technical Field

[0001] This application relates to the field of hot rolling mill technology, and more particularly to a control method, apparatus and readable storage medium for a rolling mill. Background Technology

[0002] Currently, during the hot strip mill finishing rolling process, significant fluctuations occur in process parameters such as rolling force, tension, rolling speed, and bending roll force, which can easily lead to rolling instability and breakage accidents, especially in the rolling of products with large width-to-thickness ratios. This results in technical problems such as poor control stability in existing rolling mill control methods. Summary of the Invention

[0003] This application provides a control method, apparatus, and readable storage medium for a rolling mill, which addresses technical problems such as poor control stability in the prior art.

[0004] A first aspect of this application provides a control method for a rolling mill, the rolling mill including multiple stands, the method comprising: During the rolling process of steel, the preset rolling parameters of the steel are obtained, and the measured values ​​of the bending roll force, rolling speed correction rate and rolling speed reference value of the first stand are obtained. The first stand can be any one of the multiple stands of the rolling mill. Based on the preset rolling parameters, determine the constant force setting value for the first stand; Based on the measured value of the bending roll force and the set value of the constant force, determine the target value of the bending roll force for the first frame; The target rolling speed for the first stand is determined based on the rolling speed correction rate and the rolling speed reference value. Control the first stand to roll steel according to the target values ​​of bending roll force and rolling speed.

[0005] The mill control method in this embodiment determines the setpoint of the constant force for the first stand based on the preset rolling parameters of the steel, ensuring the accuracy of the constant force setpoint data. Then, based on the measured value of the bending roll force and the constant force setpoint of the first stand, the target value of the bending roll force for the first stand is determined, ensuring the accuracy of the target value of the bending roll force data. Based on the accurate target value of the bending roll force and the constant force setpoint, the target value of the rolling speed for the first stand is determined, ensuring the accuracy of the target value of the rolling speed data. Furthermore, based on the rolling speed correction rate and the rolling speed reference value of the first stand, the target value of the rolling speed for the first stand is determined, ensuring the accuracy of the target value of the rolling speed data.

[0006] Based on precise target values ​​for bending roll force and rolling speed, the rolling of steel in the first stand is controlled, ensuring the accuracy of the first stand's control and thus improving the overall control stability of the mill. This avoids situations where the mill runs off course or overturns due to asymmetrical stress on the steel, and prevents the mill from breaking during the tailing process. On the one hand, this avoids material waste caused by cutting off the broken parts, and on the other hand, it reduces the risk of damage to the roll surface from the broken steel, reduces abnormal wear of the mill rolls, and ensures the mill's production efficiency.

[0007] A second aspect of this application provides a control device for a rolling mill, the rolling mill including multiple stands, the device comprising: The acquisition unit is used to acquire the preset rolling parameters of the steel during the rolling process of the rolling mill, and to acquire the measured value of the bending roll force, the rolling speed correction rate and the rolling speed reference value of the first stand. The first stand is any one of the multiple stands of the rolling mill. The first processing unit is used to determine the constant force setting value of the first stand according to the preset rolling parameters; The second processing unit is used to determine the target value of the bending roll force of the first frame based on the measured value of the bending roll force and the set value of the constant force. The third processing unit is used to determine the target rolling speed value of the first stand based on the rolling speed correction rate and the rolling speed reference value. The control unit is used to control the first stand to roll steel according to the target values ​​of bending roll force and rolling speed.

[0008] A third aspect of this application provides another control device for a rolling mill, including a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps of the rolling mill control method as described in any of the above embodiments. Therefore, this rolling mill control device possesses all the beneficial effects of the rolling mill control method in any of the above embodiments, and will not be elaborated further here.

[0009] A fourth aspect of this application provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the mill control method as described in any of the above embodiments. Therefore, this readable storage medium possesses all the beneficial effects of the mill control method in any of the above embodiments, which will not be elaborated further here. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A flowchart of a rolling mill control method provided in an embodiment of this application; Figure 2 A functional block diagram of the control device for a rolling mill provided in an embodiment of this application; Figure 3 This is a structural block diagram of the control device for a rolling mill provided in an embodiment of this application. Detailed Implementation

[0012] 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.

[0013] 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.

[0014] In some embodiments, this application provides a method for controlling a rolling mill. In this embodiment, the rolling mill includes multiple stands. A rolling mill is equipment used to realize the metal rolling process, generally referring to equipment that completes the entire process of rolled material production. It is widely used in industries such as steel and non-ferrous metal processing. It applies pressure to metal through rolls to cause plastic deformation, thereby producing various metal materials such as plates, pipes, and profiles. The stand is the core structural component of the rolling mill, used to install roll bearing seats, adjustment devices, and hydraulic systems, and bears the enormous rolling forces during the rolling process. Its strength and rigidity directly affect the rolling accuracy and equipment lifespan.

[0015] For example, the stands of a rolling mill are mainly divided into the following two categories: Closed frame: An integral frame structure with high strength and rigidity, suitable for primary rolling mills, slab mills, and strip mills with high rolling forces. When changing rolls, the rolls must be pulled out from the window along the axial direction.

[0016] Open frame: It consists of two parts: the frame body and the top cover. It is easy to remove the top cover for roll changing. It is mainly used in transverse profile rolling mills, but its rigidity is relatively low.

[0017] For example, multiple stands of a rolling mill are arranged in a linear fashion, and the multiple stands roll steel sequentially.

[0018] Figure 1 A flowchart of the control method for a rolling mill provided in the embodiments of this application is shown below. Figure 1 As shown, the control methods for the rolling mill include: Step S101: During the rolling process of steel in the rolling mill, the preset rolling parameters of the steel are obtained, and the measured value of the bending roll force of the first stand, the rolling speed correction rate and the rolling speed reference value are obtained. During the rolling process of steel in multiple stands of a rolling mill, the preset rolling parameters of the steel are obtained. The preset rolling parameters are the target parameters that the steel needs to be rolled.

[0019] For example, preset rolling parameters may include preset parameters such as steel thickness and steel width.

[0020] During the rolling process of steel in a rolling mill, the measured value of the bending roll force, the rolling speed correction rate, and the rolling speed reference value of the first stand are obtained. The first stand can be any one of multiple stands of the rolling mill. The measured value of the bending roll force is the real-time measured value of the bending roll force of the first stand. The rolling speed correction rate is the correction coefficient of the rolling speed of the first stand. The rolling speed reference value is the reference value of the rolling speed of the first stand.

[0021] For example, bending force is a mechanical force used in rolling mills to adjust the degree of bending of the rolls. By applying hydraulic pressure, the roll profile is dynamically controlled, thereby adjusting the strip shape, crown and straightness. It is one of the core means to achieve high-precision strip shape control in modern strip rolling processes.

[0022] For example, the bending force is applied to the work roll or support roll by a hydraulic cylinder, causing the roll to produce additional bending deformation to compensate for the roll gap changes caused by factors such as rolling force, uneven temperature, and fluctuations in the shape of the incoming material.

[0023] For example, the rolling speed reference value can be a preset standard value of the rolling speed of the first stand.

[0024] For example, the bending roll force measurement value can be obtained by real-time monitoring of the hydraulic bending roll force applied to the work roll or support roll in the rolling mill using sensors and a data acquisition system.

[0025] Step S102: Determine the constant force setting value of the first stand according to the preset rolling parameters; There is a corresponding relationship between the preset rolling parameters and the constant force setting value of the first stand. The constant force setting value of the first stand can be determined based on the preset rolling parameters. The constant force setting value is a key parameter used in the rolling mill to eliminate the gap between the bearing housing and the pressing screw.

[0026] For example, the balancing force setting can be specifically 1.2 to 1.4 times the total weight of the balancing components (upper roll, bearing housing, pressing screw, etc.).

[0027] For example, the constant force setting value corresponding to the preset rolling parameters can be determined based on a historical data table of the correspondence between preset rolling parameters and constant force setting values.

[0028] Step S103: Determine the target value of the bending roll force for the first frame based on the measured value of the bending roll force and the set value of the constant force. By comparing the measured value of the bending roll force with the constant force setting value, the target value of the bending roll force of the first frame is determined, wherein the target value of the bending roll force is the target setting value of the bending roll force of the first frame.

[0029] For example, the target value of the bending roll force can be specifically the measured value of the bending roll force or the set value of the constant force.

[0030] For example, the target value of the bending roller force can be specifically 400 kN.

[0031] Step S104: Determine the target rolling speed value for the first stand based on the rolling speed correction rate and the rolling speed reference value; By performing data analysis on the rolling speed correction rate and the rolling speed reference value, the target rolling speed value for the first stand can be determined, where the target rolling speed value is the target set value for the rolling speed of the first stand.

[0032] For example, the target rolling speed is the target setting value of the rolling speed of the first stand. The rolling speed is the circumferential speed of the roll at the point of contact with the metal. It is used to describe the linear speed of the metal passing through the roll during the rolling process and is an important parameter for measuring rolling efficiency and process control.

[0033] For example, the target rolling speed is measured in meters per second.

[0034] Step S105: Control the first stand to roll the steel according to the target values ​​of bending roll force and rolling speed.

[0035] Controlling the first stand to roll steel according to the target values ​​of bending roll force and rolling speed can improve the control stability of the first stand during the tail-end rolling process and reduce the tail-end crushing rate of the first stand.

[0036] The mill control method in this embodiment determines the setpoint of the constant force for the first stand based on the preset rolling parameters of the steel, ensuring the accuracy of the constant force setpoint data. Then, based on the measured value of the bending roll force and the constant force setpoint of the first stand, the target value of the bending roll force for the first stand is determined, ensuring the accuracy of the target value of the bending roll force data. Based on the accurate target value of the bending roll force and the constant force setpoint, the target value of the rolling speed for the first stand is determined, ensuring the accuracy of the target value of the rolling speed data. Furthermore, based on the rolling speed correction rate and the rolling speed reference value of the first stand, the target value of the rolling speed for the first stand is determined, ensuring the accuracy of the target value of the rolling speed data.

[0037] Based on precise target values ​​for bending roll force and rolling speed, the rolling of steel in the first stand is controlled, ensuring the accuracy of the first stand's control and thus improving the overall control stability of the mill. This avoids situations where the mill runs off course or overturns due to asymmetrical stress on the steel, and prevents the mill from breaking during the tailing process. On the one hand, this avoids material waste caused by cutting off the broken parts, and on the other hand, it reduces the risk of damage to the roll surface from the broken steel, reduces abnormal wear of the mill rolls, and ensures the mill's production efficiency.

[0038] In some embodiments of this application, a control method for a rolling mill is provided, which determines a target value for the bending roll force of a first stand based on the measured value of the bending roll force and the constant force setpoint, including: Under the condition that the measured value of the bending roll force is greater than or equal to the set value of the constant force, the target value of the bending roll force is determined to be equal to the measured value of the bending roll force. If the measured value of the bending roll force is less than the set value of the constant force, the target value of the bending roll force is determined to be equal to the set value of the constant force.

[0039] In this embodiment, the target value of the bending roll force of the first frame is determined by comparing the measured value of the bending roll force with the set value of the constant force.

[0040] Under the condition that the measured value of the bending roll force is greater than or equal to the set value of the constant force, the target value of the bending roll force is determined to be equal to the measured value of the bending roll force.

[0041] If the measured value of the bending roll force is less than the set value of the constant force, the target value of the bending roll force is determined to be equal to the set value of the constant force.

[0042] For example, the method for determining the target value Fbhi of the bending roll force involves determining, at the trigger time of the bending roll force target value setting correction signal, whether Fbti is greater than or equal to Fbsi, and then setting Fbhi = Fbti; if Fbti is less than Fbsi, then Fbhi = Fbsi. In the formula, Fbhi is the measured value of the bending roll force at the trigger time of the bending roll force target value setting correction signal for the i-th frame, in kN; Fbsi is the set value of the constant force for the i-th frame, in kN; and Fbhi is the set value of the bending roll force control target after the correction of the bending roll force target set value for the i-th frame, in kN.

[0043] In some embodiments, this application provides a rolling mill control method for obtaining a rolling speed correction rate for a first stand, including: Obtain the distance between the first stand and the second stand, and obtain the length of the steel between the first stand and the second stand. The second stand is the rolling mill that is adjacent to the first stand among multiple stands. Obtain the maximum allowable tensile stress and measured tension values ​​of the steel between the first and second stands, and obtain the predicted value of the remaining rolled length of the steel in the rolling mill; Obtain the elastic modulus corresponding to the first frame; The rolling speed correction rate is determined based on the elastic modulus, spacing, steel length, maximum allowable tensile stress, measured tension value, and predicted length value.

[0044] In this embodiment, the interval distance between the first frame and the second frame, the length of the steel between the first frame and the second frame are obtained respectively. The second frame is the rolling mill adjacent to the first frame among multiple frames. The interval distance is the distance between the positions of the first frame and the second frame, and the length of the steel is the length of the steel in the area between the positions of the first frame and the second frame.

[0045] Obtain the maximum allowable tensile stress and measured tension values ​​of the steel between the first frame and the second frame. The maximum allowable tensile stress is the maximum allowable tensile stress set for the steel, and the measured tension value is the actual tension of the steel.

[0046] Obtain the predicted length of the remaining rolled steel in the rolling mill, where the predicted length is the length of the remaining unrolled steel in the rolling mill.

[0047] Obtain the elastic modulus corresponding to the first frame, where the elastic modulus is a key physical parameter that measures the ability of the first frame material to resist elastic deformation under stress.

[0048] For example, the elastic modulus is typically taken as 2.1 × 10⁻⁶. 5 MPa (i.e. 210 GPa), which is basically the same as the elastic modulus of ordinary carbon steel.

[0049] The rolling speed correction rate is determined based on the elastic modulus, spacing, steel length, maximum allowable tensile stress, measured tension value, and predicted length value.

[0050] For example, the formula for determining the rolling speed correction rate is: ri=(Ei(Lpti Lpsi)+Ldi(Tmi Tti)) / (Ei×Lri); Wherein, Ei is the elastic modulus of the strip at the outlet of the i-th stand in the hot state, ranging from 14500 MPa to 15500 MPa; Lpti is the calculated strip length between stands given by the control system at the trigger time of the looper control start signal between the i-th and i+1 stands, in mm; Lpsi is the calculated strip length between stands under the looper control state between the i-th and i+1 stands, in mm; Ldi is the design spacing between the i-th and i+1 stands, in mm; Tmi is the maximum allowable tensile stress of the strip between the i-th and i+1 stands, ranging from 35 MPa to 45 MPa; Tti is the measured strip tension at the trigger time of the looper control start signal between the i-th and i+1 stands, in MPa; Lri is the predicted remaining rolling length of the 6th stand at the trigger time of the looper control start signal between the i-th and i+1 stands, in mm.

[0051] In some embodiments, this application provides a rolling mill control method that determines a target rolling speed value for a first stand based on a rolling speed correction rate and a rolling speed reference value, including: Based on the rolling speed correction rate, determine the correction coefficient corresponding to the rolling speed reference value; The product of the rolling speed reference value and the correction factor is determined to obtain the target rolling speed value.

[0052] In this embodiment, a correction coefficient corresponding to the rolling speed reference value is determined based on the rolling speed correction rate, wherein the correction coefficient is a coefficient for correcting the rolling speed reference value.

[0053] The product of the rolling speed reference value and the correction factor is determined to obtain the target rolling speed value.

[0054] For example, in the method for determining the target value of the rolling speed control of the i-th stand, after the control signal of the looper between the i-th and i+1-th stands is activated, the target value of the speed control of the i-th stand is set as Vi = Vbi(1 ri), where Vi is the target value for rolling speed control of the i-th stand; Vbi is the reference value for rolling speed control of the i-th stand given by the rolling line control system; and ri is the rolling speed correction rate of the i-th stand.

[0055] In some embodiments of this application, a rolling mill control method is provided, wherein preset rolling parameters include a thickness specification range and a width specification range, and a constant force setting value for a first stand is determined based on the preset rolling parameters, including: Obtain the response time before the first stand throws steel; The constant force setting value is determined based on the response time, thickness specification range, and width specification range.

[0056] In this embodiment, the response time before the first frame throws steel is obtained, wherein the first frame is the time between the moment the steel throwing command is received and the moment the steel is thrown.

[0057] The constant force setting value is determined based on the response time, thickness specification range, and width specification range.

[0058] For example, in the control method of the i-th machine, the bending roll force target value setting correction signal of the i-th machine is triggered at time tbfi before the steel is thrown from the i-th stand, and the value of tbfi is 0.25s to 0.4s; after the bending roll force target value setting correction signal is triggered, the bending roll force control target value of the i-th stand is set to Fbhi, where i is the stand number of the continuous rolling mill. When the maximum number of stands of the continuous rolling mill is N, i corresponds to the N-2 and N-1 stands respectively.

[0059] Implementation Case 1: This invention relates to the production of hot-dip galvanized products using a 7-stand continuous rolling mill on a certain production line. The product thickness ranges from 2.5-4.0 mm, and the width ranges from 1250-1500 mm. The parameters are: tbf5 = 0.35s, Fbs5 = 400 kN, E5 = 14500 MPa, and Tm5 = 45 MPa; tbf6 = 0.3s, Fbs6 = 400 kN, E6 = 15000 MPa, and Tm6 = 40 MPa. After adopting the control method of this invention, the tail-end breakage rate was reduced from 45% to 0.5%.

[0060] Implementation Case 2: This invention relates to the production of wide-gauge automotive steel sheets using a 7-stand continuous rolling mill on a certain production line. The product thickness ranges from 3.0-4.5 mm, and the width ranges from 1750-2000 mm. The parameters are: tbf5 = 0.3s, Fbs5 = 400 kN, E5 = 14500 MPa, and Tm5 = 40 MPa; tbf6 = 0.25s, Fbs6 = 400 kN, E6 = 15000 MPa, and Tm6 = 35 MPa. After adopting the control method of this invention, the tail-end breakage rate was reduced from 35% to 0%.

[0061] In some embodiments of this application, a control method for a rolling mill is provided. The rolling mill includes a pressure sensor to acquire the measured value of the bending roll force of a first stand, including: The control pressure sensor detects the bending force of the first frame to obtain the measured value of the bending force.

[0062] In this embodiment, the rolling mill is equipped with a pressure sensor, which is an electronic device that converts pressure signals into electrical signals. The pressure sensor is controlled to detect the bending force of the first stand in order to obtain the measured value of the bending force.

[0063] For example, pressure sensors include: Piezoresistive pressure sensors utilize the piezoresistive effect of single-crystal silicon to convert deformation into a voltage signal via a Wheatstone bridge. They offer high accuracy and fast response, making them suitable for industrial control and automotive TPMS systems.

[0064] Capacitive pressure sensors measure pressure by detecting changes in capacitance caused by diaphragm displacement. They are highly stable and commonly used in high-precision meteorological observations and medical ventilators.

[0065] Absolute pressure / gauge pressure / differential pressure sensors: classified according to the measurement method into absolute pressure (relative to vacuum), gauge pressure (relative to atmospheric pressure), and differential pressure (difference between two pressure sources).

[0066] In some embodiments of this application, a rolling mill control method is provided to obtain a rolling speed reference value for a first stand, including: Obtain multiple rolling speeds from multiple stands, with each rolling speed corresponding to one of the multiple stands; A reference value for the rolling speed is determined based on multiple rolling speeds.

[0067] In this embodiment, multiple rolling speeds of multiple stands are obtained, wherein each rolling speed corresponds one-to-one with a multiple stand, and the rolling speed is the real-time rolling speed of the stand.

[0068] A reference value for the rolling speed is determined based on multiple rolling speeds.

[0069] For example, the average speed of multiple rolling speeds can be determined, and the average speed can be determined to be equal to the rolling speed reference value.

[0070] For example, a minimum speed among multiple rolling speeds can be determined, and the minimum speed can be determined to be equal to a rolling speed reference value.

[0071] For example, a median speed among multiple rolling speeds can be determined, and the median speed can be determined to be equal to a reference speed value.

[0072] In some embodiments, such as Figure 2 As shown, an embodiment of this application provides a control device 200 for a rolling mill, comprising: The acquisition unit 202 is used to acquire the preset rolling parameters of the steel during the rolling process of the rolling mill, and to acquire the measured value of the bending roll force, the rolling speed correction rate and the rolling speed reference value of the first stand. The first stand is any one of the multiple stands of the rolling mill. The first processing unit 204 is used to determine the constant force setting value of the first stand according to the preset rolling parameters; The second processing unit 206 is used to determine the target value of the bending roll force of the first frame based on the measured value of the bending roll force and the set value of the constant force. The third processing unit 208 is used to determine the target rolling speed value of the first stand based on the rolling speed correction rate and the rolling speed reference value. Control unit 210 is used to control the first stand to roll steel according to the target values ​​of bending roll force and rolling speed.

[0073] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the second processing unit 206 is further configured to: Under the condition that the measured value of the bending roll force is greater than or equal to the set value of the constant force, the target value of the bending roll force is determined to be equal to the measured value of the bending roll force. If the measured value of the bending roll force is less than the set value of the constant force, the target value of the bending roll force is determined to be equal to the set value of the constant force.

[0074] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the third processing unit 208 is further configured to: Obtain the distance between the first stand and the second stand, and obtain the length of the steel between the first stand and the second stand. The second stand is the rolling mill that is adjacent to the first stand among multiple stands. Obtain the maximum allowable tensile stress and measured tension values ​​of the steel between the first and second stands, and obtain the predicted value of the remaining rolled length of the steel in the rolling mill; Obtain the elastic modulus corresponding to the first frame; The rolling speed correction rate is determined based on the elastic modulus, spacing, steel length, maximum allowable tensile stress, measured tension value, and predicted length value.

[0075] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the third processing unit 208 is further configured to: Based on the rolling speed correction rate, determine the correction coefficient corresponding to the rolling speed reference value; The product of the rolling speed reference value and the correction factor is determined to obtain the target rolling speed value.

[0076] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the first processing unit 204 is further configured to: Obtain the response time before the first stand throws steel; The constant force setting value is determined based on the response time, thickness specification range, and width specification range.

[0077] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the acquisition unit 202 is further configured to: The control pressure sensor detects the bending force of the first frame to obtain the measured value of the bending force.

[0078] In some embodiments of this application, a control device 200 for a rolling mill is provided, wherein the acquisition unit 202 is further configured to: Obtain multiple rolling speeds from multiple stands, with each rolling speed corresponding to one of the multiple stands; A reference value for the rolling speed is determined based on multiple rolling speeds.

[0079] In some embodiments, such as Figure 3 As shown, a rolling mill control device 300 is proposed. The rolling mill control device 300 includes a processor 302 and a memory 304. The memory 304 stores a computer program, which, when executed by the processor 302, implements the steps of the rolling mill control method as described in any of the above embodiments. Therefore, the rolling mill control device 300 possesses all the beneficial effects of the rolling mill control method in any of the above embodiments, which will not be elaborated further here.

[0080] In some embodiments, a readable storage medium is provided having a program stored thereon, which, when executed by a processor, implements the steps of the mill control method as described in any of the above embodiments, and thus has all the beneficial technical effects of the mill control method described in any of the above embodiments.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 a process of a control method for a rolling mill.

[0087] 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)).

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 control method for a rolling mill, characterized in that, The rolling mill includes multiple stands, and the method includes: During the rolling process of the steel in the rolling mill, the preset rolling parameters of the steel are obtained, and the measured value of the bending roll force, the rolling speed correction rate and the rolling speed reference value of the first stand are obtained. The first stand is any one of the multiple stands of the rolling mill. Based on the preset rolling parameters, determine the constant force setting value of the first stand; The target value of the bending roll force for the first frame is determined based on the measured value of the bending roll force and the set value of the constant force. The target rolling speed value for the first stand is determined based on the rolling speed correction rate and the rolling speed reference value. The first stand is controlled to roll the steel according to the target value of the bending roll force and the target value of the rolling speed.

2. The method according to claim 1, characterized in that, The step of determining the target value of the bending roll force of the first frame based on the measured value of the bending roll force and the set value of the constant force includes: Under the condition that the measured value of the bending roller force is greater than or equal to the set value of the constant force, the target value of the bending roller force is determined to be equal to the measured value of the bending roller force; If the measured value of the bending roller force is less than the set value of the constant force, the target value of the bending roller force is determined to be equal to the set value of the constant force.

3. The method according to claim 1, characterized in that, Obtaining the rolling speed correction rate of the first stand includes: Obtain the interval distance between the first frame and the second frame, and obtain the steel length of the steel between the first frame and the second frame, wherein the second frame is the rolling mill adjacent to the first frame among the plurality of frames; Obtain the maximum allowable tensile stress and measured tension values ​​of the steel between the first stand and the second stand, and obtain the predicted value of the remaining rolled length of the steel in the rolling mill; Obtain the elastic modulus corresponding to the first frame; The rolling speed correction rate is determined based on the elastic modulus, the spacing distance, the steel length, the maximum allowable tensile stress, the measured tension value, and the predicted length value.

4. The method according to claim 1, characterized in that, Determining the target rolling speed value for the first stand based on the rolling speed correction rate and the rolling speed reference value includes: Based on the rolling speed correction rate, determine the correction coefficient corresponding to the rolling speed reference value; The product of the rolling speed reference value and the correction coefficient is determined to obtain the rolling speed target value.

5. The method according to claim 1, characterized in that, The preset rolling parameters include a thickness specification range and a width specification range. Determining the constant force setting value of the first stand based on the preset rolling parameters includes: Obtain the response time before the first frame throws steel; The constant force setting value is determined based on the response time, the thickness specification range, and the width specification range.

6. The method according to any one of claims 1 to 5, characterized in that, The rolling mill includes a pressure sensor to acquire the measured value of the bending roll force of the first stand, including: The pressure sensor is controlled to detect the bending force of the first frame to obtain the measured value of the bending force.

7. The method according to any one of claims 1 to 5, characterized in that, Obtaining the rolling speed reference value of the first stand includes: Multiple rolling speeds are obtained from the multiple stands, and each of the multiple rolling speeds corresponds one-to-one with the multiple stands; The rolling speed reference value is determined based on the multiple rolling speeds.

8. A control device for a rolling mill, characterized in that, The rolling mill includes multiple stands, and the device includes: The acquisition unit is used to acquire the preset rolling parameters of the steel during the rolling process of the rolling mill, and to acquire the measured value of the bending roll force, the rolling speed correction rate and the rolling speed reference value of the first stand, wherein the first stand is any one of the multiple stands of the rolling mill; The first processing unit is used to determine the constant force setting value of the first stand according to the preset rolling parameters; The second processing unit is used to determine the target value of the bending roll force of the first frame based on the measured value of the bending roll force and the set value of the constant force. The third processing unit is used to determine the target rolling speed value of the first stand based on the rolling speed correction rate and the rolling speed reference value. A control unit is used to control the first stand to roll the steel according to the target value of the bending roll force and the target value of the rolling speed.

9. A control device for a rolling mill, characterized in that, include: processor; A memory, which stores programs or instructions, wherein a processor, when executing the programs or instructions in the memory, implements the steps of the mill control method as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that, A program or instructions are stored on a readable storage medium, which, when executed by a processor, implement the steps of the mill control method as described in any one of claims 1 to 7.

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