Cold rolling convexity dynamic closed-loop control method and device and electronic equipment

Abstract

The invention relates to the technical field of cold-rolled strip rolling, and discloses a cold-rolled convexity dynamic closed-loop control method and device and electronic equipment, and the method comprises the following steps: collecting a cold-rolled convexity measured value and a rolling speed of a steel grade to be rolled, and calculating a convexity deviation based on the cold-rolled convexity measured value and a target convexity value; the current rolling state is judged based on the rolling speed; and based on the rolling speed, the convexity deviation and the preset steel grade dividing basic parameters, a speed self-adaptive control algorithm or an acceleration and deceleration protection control algorithm is adopted in the current rolling state to dynamically compensate the bending force of the working roll of the UCM rolling mill so as to perform dynamic closed-loop control on the cold rolling convexity. The roller bending force of the working roller of the S1 / S2 rack in the rolling mill can be compensated in real time, and the problem that the silicon steel same-plate difference through-roll hit rate is low is solved.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled sheet and strip rolling technology, specifically to a method, apparatus, and electronic equipment for dynamic closed-loop control of cold-rolled crown. Background Technology

[0002] Cold-rolled non-oriented silicon steel is mainly used to manufacture stator and rotor cores for equipment such as electric motors, generators, and transformers, and is widely used in home appliances, industrial motors, and new energy vehicles. The difference in quality between different sheets of silicon steel is a crucial indicator of product quality, directly affecting the current loss and overall performance of the motor. In recent years, as end-users have increasingly higher requirements for motor performance, even higher demands have been placed on the level of difference in quality between sheets of cold-rolled silicon steel products.

[0003] Some related technologies use hot-rolled material crown and thickness detection data from the inlet crown gauge to pre-set the bending roll force and roll tilt values ​​of the upstream stand; and adjust the bending roll force and roll tilt values ​​of the S1 / S2 stand based on feedback from the crown and wedge data of the mill exit edge drop gauge to achieve closed-loop control. However, the crown closed-loop control system does not consider speed adaptive characteristics. Changes in mill speed affect the bending roll force compensation effect. When the rolling speed changes, if the crown and wedge compensation rates remain unchanged, it will lead to uneven control of crown and wedge along the strip length. For example, if the rolling speed increases and the strip runs faster, but the bending roll force and roll gap are still adjusted at the original rate, this will result in slower control efficiency. Secondly, the strip shape fluctuates significantly at the head and tail. When the edge drop meter detects abnormal signals, the crown detection value may be too high. Since there is no abnormal signal shielding mechanism in the relevant technology, this could lead to excessive bending roll force compensation, causing strip breakage. Thirdly, the relevant technology lacks acceleration and deceleration protection functions. With numerous defects at the head and tail of the strip, using excessive bending roll force would greatly increase the probability of strip breakage at the head and tail edges, affecting production stability. Fourthly, the relevant technology does not provide a window for selecting compensation coefficients based on steel grade; all grades use the same bending roll force compensation coefficient, which is unconventional. Different steel grades have different strengths and rolling forces, and the efficiency of bending roll force and mill roll gap adjustment mechanisms in controlling crown and wedge shape also varies. Therefore, a single set of coefficients cannot be used exclusively.

[0004] In summary, the relevant technologies do not consider production stability. While pursuing small crown and small wedge shape, they increase the risk of strip breakage. As a result, the bending force of the work roll can only be pre-set based on the rolling force and the amount of intermediate roll slippage. It is impossible to compensate for the bending force of the work roll in the S1 / S2 stand (the first stand and the second stand) of the rolling mill in real time, which causes the problem of low winding hit rate of silicon steel of the same plate. Summary of the Invention

[0005] This invention provides a dynamic closed-loop control method, device, and electronic equipment for cold rolling crown, in order to solve the problem of low on-coil hit rate of silicon steel due to the inability to compensate for the bending roll force of the work rolls in the S1 / S2 stands (first stand and second stand) of the rolling mill in real time.

[0006] In a first aspect, the present invention provides a dynamic closed-loop control method for cold rolling crown, applied to a UCM mill, the method comprising: Collect the measured values ​​of cold-rolled crown and rolling speed of the steel grade to be rolled, and calculate the crown deviation based on the measured values ​​of cold-rolled crown and the target crown value; The current rolling status is determined based on the rolling speed; Based on rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under the current rolling conditions, so as to achieve dynamic closed-loop control of the cold rolling crown.

[0007] This invention provides a dynamic closed-loop control method for cold-rolled crown, which addresses the control limitations of UCM mills. By collecting measured cold-rolled crown data to calculate deviations, combining rolling speed to determine rolling status, and then matching speed adaptive or acceleration / deceleration protection control algorithms, and incorporating preset basic parameters for different steel grades, this method not only solves the problem of uneven crown control caused by changes in rolling speed in traditional control, but also reduces the risk of strip breakage at the head and tail of the strip through targeted protection during acceleration / deceleration stages. Furthermore, it can adapt to the rolling characteristics of different steel grades, ultimately achieving precise dynamic closed-loop control of cold-rolled crown, effectively improving the consistency of strip crown along its entire length, balancing product quality and production stability. It also solves the problem of low coiling success rate for silicon steel due to the inability to compensate for the bending force of the work rolls in the S1 / S2 stands (first and second stands) of the mill in real time.

[0008] In one optional implementation, calculating the crown deviation based on the measured value of cold-rolled crown and the target crown value includes: The difference between the measured value of cold-rolled crown and the target crown value is calculated to obtain the crown deviation.

[0009] This invention provides a dynamic closed-loop control method for cold-rolled crown, which obtains the deviation by directly calculating the difference between the measured value and the target crown value. The calculation logic is simple and direct, requiring no complex calculations, which can minimize the error introduced by additional calculation steps and ensure the original accuracy of the deviation data. It can intuitively quantify the difference between the measured value and the target value, providing a clear and explicit compensation basis for subsequent speed adaptive or acceleration / deceleration protection control algorithms. At the same time, it facilitates the rapid matching of abnormal signal shielding mechanisms (such as judging whether the absolute value of the deviation exceeds the threshold), ensuring the input reliability of the dynamic closed-loop control of cold-rolled crown from the source, and laying the foundation for subsequent precise adjustment of the bending force of the work roll.

[0010] In one optional implementation, determining the current rolling state based on the rolling speed includes: When the rolling speed is greater than or equal to the preset speed threshold, it is judged to be in a steady rolling state; When the rolling speed is less than the preset speed threshold, it is judged to be in the acceleration / deceleration stage, i.e., low speed state.

[0011] This invention provides a dynamic closed-loop control method for cold rolling crown, which clearly distinguishes between steady-state rolling and acceleration / deceleration (low-speed) states by whether the rolling speed reaches a preset threshold. The judgment logic is simple and intuitive, without complex calculations, and can quickly respond to changes in rolling speed, avoiding delays or ambiguities in state judgment. At the same time, it can accurately match subsequent control algorithms, triggering adaptive speed control in steady state to ensure crown adjustment accuracy, and triggering protection control in acceleration / deceleration stages to reduce the risk of strip breakage. This ensures the pertinence of control strategies for different rolling stages and reduces control disorder caused by state misjudgment, providing a reliable pre-judgment basis for the orderly and stable operation of dynamic closed-loop control of cold rolling crown.

[0012] In an optional implementation, the method further includes: presetting basic parameters for different steel grades in the following manner: Based on the strength characteristics of the steel grade to be rolled, corresponding basic parameters for each steel grade are set through steel grade compensation operation. These basic parameters include the speed compensation coefficient, crown compensation coefficient, steady-state bending force compensation limit, and low-speed bending force compensation limit of the work roll bending force.

[0013] This invention provides a dynamic closed-loop control method for cold rolling crown, which takes the strength characteristics of the steel grade to be rolled as the core basis. Through refined compensation operations, it sets the speed compensation coefficient, crown compensation coefficient, and steady-state bending force compensation limit of the work roll bending force. This method accurately adapts to the differences in rolling force and elastic deformation of the roll system caused by the strength differences of different steel grades, avoiding the problem of insufficient control or over-compensation for some steel grades under uniform parameters. Furthermore, by covering the key influencing dimensions of bending force compensation, it allows the subsequent dynamic closed-loop control to better fit the rolling requirements of specific steel grades. This improves the control accuracy and coil consistency of cold rolling crown for different steel grades, and further reduces the risk of strip breakage caused by parameter mismatch through steady-state compensation limit, thus balancing control accuracy and production stability.

[0014] In one optional implementation, based on rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under the current rolling condition, including: Based on rolling speed, crown deviation and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under steady-state rolling conditions. Based on preset basic parameters for different steel grades, an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill at low speeds.

[0015] This invention provides a dynamic closed-loop control method for cold-rolled crown, which matches differentiated control algorithms to different rolling states. During steady-state rolling, speed adaptive control is activated by combining rolling speed, crown deviation, and basic parameters of different steel grades to achieve dynamic adaptation of bending roll force compensation with rolling speed and crown deviation. During low-speed conditions, acceleration and deceleration protection control is activated based on the parameters of different steel grades, and the compensation strategy is adjusted accordingly. This ensures accurate correction of cold-rolled crown under steady-state conditions and reduces the risk of strip breakage through protective compensation during acceleration and deceleration. At the same time, the integration of basic parameters of different steel grades allows both algorithms to adapt to the rolling characteristics of different steel grades. Ultimately, it achieves accurate, differentiated, and dynamic bending roll force compensation under different states and different steel grades, effectively improving the consistency of cold-rolled crown throughout the coil and the stability of the production process.

[0016] In one optional implementation, based on rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls in a UCM mill under steady-state rolling conditions, including: The steady-state work roll bending force compensation is calculated based on rolling speed, crown deviation, speed compensation coefficient, and crown compensation coefficient. Based on the steady-state bending force compensation amount of the working roll and the bending force of the working roll before scanning, the bending force compensation amount of the working roll after scanning is calculated; the bending force compensation amount of the working roll after scanning is within the steady-state bending force compensation limit. Based on the work roll bending force compensation after scanning and the work roll bending force under steady-state rolling conditions, the steady-state work roll bending force is calculated, and the cold rolling crown is dynamically controlled based on the steady-state work roll bending force.

[0017] This invention provides a dynamic closed-loop control method for cold-rolled crown, employing a speed adaptive control algorithm under steady-state rolling conditions. By integrating rolling speed, crown deviation, and speed and crown compensation coefficients for different steel grades, the method calculates the bending roll force compensation amount, ensuring precise adaptation of the compensation amount to actual rolling conditions and steel grade characteristics. Simultaneously, by integrally calculating the scanned compensation amount and limiting it within the steady-state bending roll force compensation limit, it achieves dynamic cumulative correction of deviations while avoiding abnormal strip shape caused by over-compensation. Finally, based on the calculation results, the method dynamically adjusts the steady-state work roll bending roll force, forming a complete closed-loop control. This improves the control accuracy and response speed of cold-rolled crown in the steady-state stage, and ensures control stability through steel grade parameters and a limiting mechanism. It effectively reduces crown deviations caused by speed fluctuations or steel grade differences, significantly improving the consistency of strip crown throughout the coil.

[0018] In one optional implementation, based on rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under steady-state rolling conditions. This further includes: When the absolute value of the crown deviation is greater than or equal to the preset deviation threshold, the measured value of cold rolling crown corresponding to the crown deviation is automatically shielded, so that the corresponding measured value of cold rolling crown does not participate in the dynamic compensation operation of the bending roll force of the work roll of the UCM mill.

[0019] This invention provides a dynamic closed-loop control method for cold rolling crown. By automatically shielding the corresponding measured value when the absolute value of the crown deviation reaches a preset threshold, preventing it from participating in the dynamic compensation of the bending roll force, it can effectively filter extreme deviation signals caused by edge drop meter detection errors or local anomalies in the strip. This avoids excessive calculation of the bending roll force compensation due to abnormal signals, thereby preventing problems such as strip edge tension breakage or strip shape disorder caused by sudden increases or decreases in the bending roll force of the work roll. At the same time, only normal deviation signals are retained for compensation calculation, ensuring that the bending roll force adjustment under steady-state rolling is always based on real and reliable crown data. Combined with preset basic parameters for different steel grades, this further maintains the accuracy and stability of cold rolling crown control, making the output of the speed adaptive control algorithm more in line with actual rolling requirements and ensuring the consistency of the strip's continuous coil crown.

[0020] In one optional implementation, based on preset basic parameters for different steel grades, an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill at low speeds, including: Reduce the speed compensation coefficient and convexity compensation coefficient to a preset multiple; The compensation amount of bending force of the work roll after scanning is calculated based on the reduced convexity compensation coefficient and speed compensation coefficient; the compensation amount of bending force of the work roll after scanning is calculated based on the adjustment rate of the additional bending force of the work roll in the low-speed state and the additional bending force of the work roll in the low-speed state before scanning; the additional bending force of the work roll in the low-speed state is within the compensation limit of the low-speed bending force. Based on the additional bending force at low speed, the compensation amount of bending force of the work roll after scanning, and the bending force of the work roll at the current low speed, the bending force of the work roll at low speed is calculated, and the cold rolling crown is dynamically controlled in a closed loop based on the bending force of the work roll at low speed.

[0021] This invention provides a dynamic closed-loop control method for cold rolling crown, including an acceleration / deceleration protection control algorithm under low-speed conditions. By first reducing the speed compensation coefficient and crown compensation coefficient to a preset multiple, the compensation rate of the bending roll force in the low-speed stage can be effectively reduced, avoiding a sudden increase in strip edge stress due to excessive compensation. Then, the reduced crown compensation coefficient is used to calculate the bending roll force compensation amount after scanning, and it is limited within the steady-state bending roll force compensation limit. Finally, a negative additional bending roll force is calculated based on the additional bending roll force adjustment rate in the low-speed state, within the additional bending roll force compensation limit (it is recommended to further refine and improve this method based on the modified content). It can offset part of the conventional compensation amount and reduce the risk of strip edge tension by using negative additional bending roll force, and prevent new strip shape problems caused by excessive additional bending roll force. Finally, based on the additional bending roll force, the compensation amount after scanning and the current bending roll force, the final bending roll force in the low-speed state is calculated and closed-loop control is achieved. At the same time, relying on the preset basic parameters of different steel grades to adapt to the rolling characteristics of different steel grades, it not only solves the problems of many defects at the beginning and end of the strip and easy strip breakage, but also ensures the basic control accuracy of cold rolling crown in the low-speed stage, and achieves a balance between production stability and strip shape control effect.

[0022] Secondly, the present invention provides a dynamic closed-loop control device for cold rolling crown, applied to a UCM mill, the device comprising: The crown deviation calculation module is used to collect the measured value of the cold-rolled crown of the steel to be rolled and the rolling speed, and to calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value. The rolling state determination module is used to determine the current rolling state based on the rolling speed. The dynamic closed-loop control module is used to dynamically compensate the bending force of the work rolls of the UCM mill based on the rolling speed, crown deviation and preset basic parameters for different steel grades, using a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm under the current rolling state, so as to perform dynamic closed-loop control of the cold rolling crown.

[0023] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the cold rolling crown dynamic closed-loop control method of the first aspect or any corresponding embodiment described above.

[0024] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the cold rolling crown dynamic closed-loop control method of the first aspect or any corresponding embodiment described above.

[0025] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the cold rolling crown dynamic closed-loop control method of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an application scenario according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the first type of dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the second process of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the third process of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating the refined compensation operation for different steel grades in the dynamic closed-loop control method for cold-rolled crown according to an embodiment of the present invention. Figure 6 This is a flowchart illustrating the speed adaptive control algorithm of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention; Figure 7 This is a flowchart illustrating the acceleration / deceleration protection control algorithm of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention. Figure 8(a) is a schematic diagram of the bending roll force curve of the work roll of the W1300-S1 / S2 stand before the cold rolling crown closed-loop control method of the present invention is put into use. Figure 8(b) is a schematic diagram of the bending roll force curve of the work roll of W1300-S1 / S2 stand after the cold rolling crown closed-loop control method of the present invention is put into use; Figure 8(c) is a schematic diagram of the bending roll force curve of the work roll of W800-S1 / S2 stand before the cold rolling crown closed-loop control method of the present invention is put into use; Figure 8(d) is a schematic diagram of the bending roll force curve of the work roll of W800-S1 / S2 stand after the cold rolling crown closed-loop control method of the present invention is put into use. Figure 8(e) is a schematic diagram of the bending roll force curve of the work roll of the W600-S1 / S2 stand before the cold rolling crown closed-loop control method of the present invention is put into use. Figure 8(f) is a schematic diagram of the bending roll force curve of the work roll of W600-S1 / S2 stand after the cold rolling crown closed-loop control method of the present invention is put into use. Figure 9(a) is a schematic diagram comparing the full-length crown curves of W1300 before and after the cold rolling crown closed-loop control method of the present invention is put into use; Figure 9(b) is a schematic diagram comparing the full-length crown curves of W800 before and after the cold rolling crown closed-loop control method of the present invention is put into use; Figure 9(c) is a schematic diagram comparing the full-length crown curves of W600 before and after the cold rolling crown closed-loop control method of the present invention is put into use; Figure 10 This is a structural block diagram of a dynamic closed-loop control device for cold rolling crown according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0030] The UCM (Universal Crown Control Mill) is a traditional six-roll, five-stand mill. Each stand has the functions of bending the work roll, bending the intermediate roll, and shifting the intermediate roll, giving it a strong ability to control the difference in thickness between silicon steel plates.

[0031] However, compared with the UCMW mill (Universal Crown Control Mill with Work Roll Shifting), this model does not have the function of work roll shifting. It cannot adjust the insertion amount of the work roll shape of the upstream stand in real time based on the measured data of the exit edge drop meter. The exit edge drop meter only plays the role of detecting the thickness of the cold rolled section of silicon steel and cannot realize closed-loop control of edge drop. This limits the improvement of the consistency level of the same plate of silicon steel through-coiling to a certain extent, and it is also impossible to compensate for the bending force of the work rolls of the S1 / S2 stands (the first stand and the second stand) in the mill in real time, resulting in the problem of low hit rate of the same plate of silicon steel through-coiling.

[0032] This invention provides a dynamic closed-loop control method for cold rolling crown. Based on measured data from the mill exit edge drop meter and the rolling speed, the bending roll force is dynamically adjusted to form a crown closed loop. Simultaneously, an acceleration / deceleration protection module and an abnormal signal shielding mechanism are developed to eliminate the impact of excessive bending roll compensation on production stability. Finally, refined control operations based on steel grade meet the crown control requirements of different steel grades, achieving real-time compensation of the bending roll force of the work rolls in the S1 / S2 stands (first and second stands) of the mill, thus improving the success rate of through-coiling of silicon steel with different plate thicknesses.

[0033] As an optional application scenario of this invention, such as Figure 1 As shown, this embodiment of the invention provides a dynamic closed-loop control system for cold-rolled crown, including: a speed adaptive control module, an acceleration / deceleration protection module, and a steel grade-specific refined compensation module. Wherein: The speed adaptive module, under steady-state rolling conditions, adjusts the bending force of the work rolls on stands S1 / S2 based on the measured crown value from the UCM mill exit edge drop gauge, achieving dynamic closed-loop control of cold-rolled crown. This module establishes a speed adaptive mechanism (automatically adjusting the bending force compensation speed according to the current rolling speed) and an abnormal signal shielding mechanism (automatically shielding abnormal crown detection signals to prevent strip breakage caused by excessive bending force compensation rate). Specifically, the speed adaptive compensation module adjusts the work roll bending force in real time based on the crown data measured by the mill exit edge drop gauge and the rolling speed, achieving speed-adaptive compensation for cold-rolled crown. Without a speed adaptive mechanism, if the bending force compensation rate remains unchanged when the rolling speed changes, it will lead to uneven control of the cold-rolled crown along the length of the strip. Simultaneously, an interference shielding mechanism is established to prevent strip breakage caused by excessive bending force adjustment for abnormal detection signals from the acid rolling edge drop gauge.

[0034] The acceleration / deceleration protection module is primarily designed for the acceleration and deceleration sections at the beginning and end of the strip. These sections often have numerous defects such as holes and edge cracks. To prevent strip breakage due to excessive bending roller force at the edges, the system automatically applies a negative additional bending roller force to ensure stable production. In other words, the acceleration / deceleration protection module addresses the issue of numerous edge defects at the beginning and end of the strip, where excessive bending roller force compensation could easily cause strip breakage due to edge tension. Therefore, a negative additional bending roller force is added during the low-speed sections at the beginning and end to ensure production stability.

[0035] The refined compensation module for different steel grades addresses the varying strengths and challenges in controlling cold-rolled crown among different steel grades, requiring the separate setting of bending roll compensation coefficients to accommodate each grade. Specifically, the module addresses the differences in strength, rolling force, and elastic deformation of the roll system between different steel grades, resulting in varying levels of difficulty in controlling sheet weight variation. To meet the requirements for controlling sheet weight variation across different steel grades, a refined compensation module for different steel grades was developed, allowing for the precise setting of bending roll force compensation coefficients and bending roll force adjustment limits.

[0036] According to an embodiment of the present invention, a method for dynamic closed-loop control of cold rolling crown is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0037] This embodiment provides a dynamic closed-loop control method for cold rolling crown, which can be used in a UCM mill. The UCM mill includes a first stand (referred to as the S1 stand) and a second stand S2 (referred to as the S2 stand). Figure 2 This is a flowchart of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps: Step S201: Collect the measured value of the cold-rolled crown and the rolling speed of the steel to be rolled, and calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value.

[0038] Specifically, the steel grade to be rolled refers to a specific type of steel that will soon enter the rolling mill for cold rolling. These are typically classified according to composition, strength, and application, such as cold-rolled non-oriented silicon steel (e.g., W1300, W800, W600, etc.). The different physical properties (such as strength and hardness) and rolling requirements of different steel grades directly affect the rolling force, roll deformation, and the difficulty of shape control in the rolling mill. Therefore, it is necessary to set specific rolling parameters (such as the bending roll compensation coefficient), which is the core basis for the refined control of steel grades in the refined compensation module for each steel grade.

[0039] Cold-rolled crown refers to the thickness distribution difference of the strip cross-section (along the width direction) after cold rolling, manifested as the thickness difference between the middle and edge regions of the strip cross-section (thicker in the middle, thinner at the edges). It is a key indicator for evaluating the quality of cold-rolled strip shape. If the crown is too large, it will lead to uneven transverse stress in the strip, which can easily cause poor bonding during subsequent processing (such as lamination of motor cores), thus affecting the performance of end products such as motor efficiency. The core objective of this invention is to control the cold-rolled crown within a preset target value (e.g., 5μm) to ensure uniform thickness across the entire width of the strip.

[0040] Rolling speed refers to the speed at which strip steel passes through the working rolls of the rolling mill during the cold rolling process. It is the length of the strip steel passing through the rolling zone of the rolling mill per minute, and the unit is meters per minute (mpm).

[0041] The measured values ​​of cold-rolled crown and rolling speed of the steel grade to be rolled were collected using a UCM mill exit edge drop meter. The crown deviation was obtained by comparing the measured values ​​of cold-rolled crown with the target crown value.

[0042] Step S202: Determine the current rolling state based on the rolling speed.

[0043] Specifically, the rolling state refers to the operating stage or condition of the strip steel during cold rolling in the rolling mill. It is mainly classified according to the rolling speed and is the core judgment basis for the rolling mill control system to select an appropriate control strategy.

[0044] Based on the rolling speed, the current rolling state is determined to be either a steady-state rolling state or an acceleration / deceleration phase.

[0045] Steady-state rolling state: When the rolling speed reaches or exceeds the preset threshold, the strip runs stably. At this time, it is suitable to use a more precise speed adaptive control algorithm to focus on the accurate correction of crown.

[0046] Acceleration / deceleration phase (low speed state): When the rolling speed is lower than the preset threshold, it is mostly the process of the strip head and tail passing through the rolling mill to accelerate or decelerate. The strip is prone to fluctuation in force. At this time, an acceleration / deceleration protection control algorithm is required to prioritize production stability (such as reducing the risk of strip breakage).

[0047] Step S203: Based on the rolling speed, crown deviation and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls of the UCM mill under the current rolling condition, so as to perform dynamic closed-loop control of the cold rolling crown.

[0048] Specifically, by combining the rolling speed, crown deviation, and the basic parameters of the steel grade to be rolled, and based on the current rolling state, the speed adaptive control algorithm of the speed adaptive module or the acceleration and deceleration protection control algorithm of the acceleration and deceleration protection module are used to dynamically compensate the bending roll force of the work rolls of the S1 stand / S2 stand in the UCM mill, thereby realizing dynamic closed-loop control of cold rolling crown.

[0049] The cold-rolled crown dynamic closed-loop control method provided in this embodiment addresses the control limitations of UCM mills. By collecting measured cold-rolled crown data to calculate deviations, combining rolling speed to determine rolling status, and then matching speed adaptive or acceleration / deceleration protection control algorithms, it incorporates preset basic parameters for different steel grades. This not only solves the problem of uneven crown control caused by rolling speed variations in traditional control, but also reduces the risk of strip breakage at the head and tail of the strip through targeted protection during acceleration / deceleration stages. Furthermore, it can adapt to the rolling characteristics of different steel grades, ultimately achieving precise dynamic closed-loop control of cold-rolled crown. This effectively improves the overall crown consistency of the strip, balancing product quality and production stability. It also solves the problem of low coiling success rate for silicon steel due to the inability to compensate for the bending force of the work rolls in the S1 / S2 stands (first and second stands) of the mill in real time.

[0050] This embodiment provides a dynamic closed-loop control method for cold rolling crown, which can be used in UCM rolling mills. Figure 3 This is a flowchart of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention, as shown below. Figure 3 As shown, the process includes the following steps: Step S301: Collect the measured value of the cold-rolled crown and the rolling speed of the steel to be rolled, and calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value.

[0051] Specifically, step S301 includes: Step a: Calculate the difference between the measured value of cold-rolled crown and the target crown value to obtain the crown deviation.

[0052] The formula for calculating convexity deviation is as follows: (1); in, This represents the measured value of cold-rolled crown. This represents the target convexity value.

[0053] Step S302: Determine the current rolling state based on the rolling speed.

[0054] Specifically, step S302 includes: Step S3021: When the rolling speed is greater than or equal to the preset speed threshold, it is determined to be a steady rolling state.

[0055] Specifically, the preset speed threshold is set to 200 mpm, where mpm means meters per minute.

[0056] When rolling speed Greater than or equal to 200mpm, that is When the strip is cold rolled in the rolling mill, the operating condition is determined to be a steady-state rolling state.

[0057] Step S3022: When the rolling speed is less than the preset speed threshold, it is determined to be in the acceleration / deceleration stage, i.e., low speed state.

[0058] Specifically, when the rolling speed Less than 200mpm, that is When the strip is cold-rolled in the rolling mill, it is determined that the operating condition is in the acceleration / deceleration stage, i.e., the low-speed state.

[0059] Step S303: Based on rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under the current rolling condition, in order to achieve dynamic closed-loop control of the cold-rolled crown. For details, please refer to [link to relevant documentation]. Figure 2 Step S203 of the illustrated embodiment will not be described again here.

[0060] The cold rolling crown dynamic closed-loop control method provided in this embodiment distinguishes between steady-state rolling and acceleration / deceleration (low-speed) states by clearly defining whether the rolling speed reaches a preset threshold. The judgment logic is simple and intuitive, without complex calculations, and can quickly respond to changes in rolling speed, avoiding delays or ambiguities in state judgment. At the same time, it can accurately match subsequent control algorithms, triggering adaptive speed control in steady state to ensure crown adjustment accuracy, and triggering protection control in acceleration / deceleration stages to reduce the risk of strip breakage. This ensures the pertinence of control strategies for different rolling stages and reduces control disorder caused by state misjudgment, providing a reliable pre-judgment basis for the orderly and stable operation of cold rolling crown dynamic closed-loop control.

[0061] This embodiment provides a dynamic closed-loop control method for cold rolling crown, which can be used in UCM rolling mills. Figure 4 This is a flowchart of the dynamic closed-loop control method for cold rolling crown according to an embodiment of the present invention, as shown below. Figure 4 As shown, the process includes the following steps: Step S401: Collect the measured value of the cold-rolled crown and the rolling speed of the steel grade to be rolled, and calculate the crown deviation based on the measured value and the target crown value. For details, please refer to [link to relevant documentation]. Figure 3 Step S301 of the illustrated embodiment will not be described again here.

[0062] Step S402: Determine the current rolling state based on the rolling speed. For details, please refer to [link to relevant documentation]. Figure 3Step S302 of the illustrated embodiment will not be described again here.

[0063] Step S403: Preset the basic parameters for different steel grades in the following manner: Based on the strength characteristics of the steel grade to be rolled, set the corresponding basic parameters for different steel grades through a refined compensation operation for different steel grades. The basic parameters for different steel grades include the speed compensation coefficient of the bending force of the work roll, the crown compensation coefficient, the steady-state bending force compensation limit, and the low-speed bending force compensation limit.

[0064] Specifically, a steel grade-specific fine compensation module is used to pre-set the basic parameters for each steel grade. Since different steel grades have different strengths, rolling forces, and elastic deformations of the roll system, the difficulty of controlling the same plate difference varies. Therefore, a steel grade-specific fine compensation module is used to finely set the work roll bending force compensation coefficient and steady-state bending force adjustment limit (also known as steady-state bending force compensation limit) for different steel grades according to actual needs. The work roll bending force compensation coefficient includes the speed compensation coefficient and crown compensation coefficient of the work roll bending force.

[0065] For example, such as Figure 5 As shown, there are multiple steel grades (steel grade 1, steel grade 2, steel grade 3, ..., steel grade n), each steel grade corresponds to a set of specific compensation parameters, including: Steel grade 1: Speed ​​compensation coefficient Convexity compensation coefficient Steady-state bending roll force compensation limit , , , These represent the lower limit and upper limit of steady-state bending roll force compensation for steel grade 1, respectively.

[0066] Steel grade 2: Speed ​​compensation coefficient Convexity compensation coefficient Steady-state bending roll force compensation limit , , , These represent the lower limit and upper limit of steady-state bending roll force compensation for steel grade 2, respectively.

[0067] Steel grade 3: Speed ​​compensation coefficient Convexity compensation coefficient Steady-state bending roll force compensation limit , , , These represent the lower limit and upper limit of steady-state bending roll force compensation for steel grade 3, respectively.

[0068] Steel grade n: speed compensation coefficient Convexity compensation coefficient Steady-state bending roll force compensation limit , , , These represent the lower limit and upper limit of steady-state bending roll force compensation for steel grade n, respectively.

[0069] After the steel grade-specific fine compensation module sets the basic parameters for different steel grades, it transmits them to the speed adaptive control module.

[0070] Step S404: Based on the rolling speed, crown deviation and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls of the UCM mill under the current rolling condition, so as to perform dynamic closed-loop control of the cold rolling crown.

[0071] Specifically, step S404 includes: Step S4041: Based on the rolling speed, crown deviation and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls of the UCM mill under steady-state rolling conditions.

[0072] Specifically, this step is implemented using a speed adaptive control module, which dynamically compensates for the bending force of the work rolls in the UCM mill through a speed adaptive control algorithm. The speed adaptive control module includes a speed adaptive mechanism and an abnormal signal shielding mechanism.

[0073] In one alternative implementation, a flowchart of the speed adaptive control algorithm is shown below. Figure 6 As shown, step S4041 above includes: Step b1: Calculate the steady-state work roll bending force compensation based on rolling speed, crown deviation, speed compensation coefficient, and crown compensation coefficient.

[0074] Specifically, under steady-state rolling conditions (i.e., rolling speed ≥ 200 mpm, mpm is the unit of speed), the calculation formula for the bending roll force compensation of the work rolls in the S1 / S2 stands of the UCM mill is as follows: (2); in, This is the compensation amount for the bending force of the steady-state work roll; This refers to the rolling speed, measured in MPa. The speed compensation coefficient for the bending force of the work roll; This indicates the crown deviation between the measured crown value and the target crown value of cold rolling. C 实测 - C 目标 ), in μm; This is the crowning compensation coefficient for the bending force of the work roll.

[0075] Step b2: Calculate the work roll bending force compensation amount after scanning based on the steady-state work roll bending force compensation amount and the work roll bending force before scanning; the work roll bending force compensation amount after scanning is within the steady-state bending force compensation limit.

[0076] Specifically, the steady-state work roll bending force compensation is integrated over time; that is, the work roll bending force compensation is accumulated once per sensor scanning cycle. The calculation formula is as follows: (3); Among them, the crown detection sensor on the exit side of the UCM mill scans before... The initial value is 0. To protect the program and prevent the bending roll force compensation from increasing or decreasing indefinitely, a limit is set for the steady-state work roll bending roll force compensation adjustment. Lower limit of steady-state bending roll force compensation The default value is -50kN (kN represents kilonewtons), which is the upper limit of steady-state bending roll force compensation. The default value is 50kN.

[0077] Step b3: Based on the work roll bending force compensation amount after scanning and the work roll bending force under steady-state rolling conditions, calculate the steady-state work roll bending force, and perform dynamic closed-loop control on the cold rolling crown based on the steady-state work roll bending force.

[0078] Specifically, the steady-state work roll bending force compensation is added to the current bending force to obtain the final steady-state work roll bending force value: (4); in, To compensate for the bending force of the work roll in the previous steady state (i.e., the bending force of the work roll in the steady rolling state). To compensate for the bending force of the working roll in the steady state.

[0079] Step b4: When the absolute value of the crown deviation is greater than or equal to the preset deviation threshold, the measured value of cold rolling crown corresponding to the crown deviation is automatically shielded, so that the corresponding measured value of cold rolling crown does not participate in the dynamic compensation operation of the bending roll force of the UCM mill work roll.

[0080] Specifically, the anomaly detection signal shielding mechanism: shields the convexity deviation between the detected convexity value and the target convexity value of the cold-rolled roll. Make a judgment if If the value is ≥50μm, the cold rolling crown detection value signal will be automatically filtered out (let...). =0), so that it does not participate in the closed-loop control of bending roller force-convexity.

[0081] Step S4042: Based on the preset basic parameters for different steel grades, the acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls of the UCM mill under low speed conditions.

[0082] Specifically, the acceleration / deceleration protection module is designed to address the numerous defects and production instability at the beginning and end of the strip. Excessive bending roll force or too rapid compensation rate can lead to excessive tensile stress at the strip edges, increasing the likelihood of strip breakage. Therefore, during the acceleration / deceleration phase at the beginning and end (rolling speed...),... v <200mpm), apply a negative additional bending roll force, while reducing the bending roll force compensation coefficient. and .

[0083] In one optional implementation, the flowchart of the acceleration / deceleration protection control algorithm is as follows: Figure 7 As shown, step S4042 above includes: Step c1: Reduce the speed compensation coefficient and convexity compensation coefficient to a preset multiple.

[0084] Specifically, the preset multiplier is 0.5, meaning that at low speeds, the speed compensation coefficient is set to 0.5. Convexity compensation coefficient Reduced to and .

[0085] Step c2: Calculate the bending force compensation amount of the work roll after scanning based on the reduced convexity compensation coefficient and speed compensation coefficient; calculate the additional bending force of the work roll after scanning based on the adjustment rate of the additional bending force in the low-speed state and the additional bending force in the low-speed state before scanning; the additional bending force in the low-speed state is within the steady-state bending force compensation limit.

[0086] Specifically, the compensation amount for bending force of the work roll after scanning is calculated using the following formula, based on the reduced convexity compensation coefficient and speed compensation coefficient: (5); in, , This is the compensation amount for bending force of the work roll after scanning.

[0087] The formula for calculating the additional bending roller force at low speed after scanning is as follows: (6); in, Add bending roller force to the low-speed state after each sensor scan; A bending roller force is applied at low speed before each sensor scan, with an initial value of 0. The adjustment rate for the additional bending roller force at low speeds is expressed in kN. This coefficient needs to be considered in conjunction with the sensor scanning cycle. T(Unit: milliseconds) is used to determine this; generally speaking, ×(1000 / T) not exceeding 10kN.

[0088] Additional bending force at low speed after scanning The adjustment limit is Among them, the upper limit of low-speed bending roller force compensation The default value is 50kN.

[0089] Step c3: Based on the additional bending force of the work roll in the low-speed state, the compensation amount of the bending force of the work roll after scanning, and the bending force of the work roll in the current low-speed state, calculate the bending force of the work roll in the low-speed state, and perform dynamic closed-loop control of the cold rolling crown based on the bending force of the work roll in the low-speed state.

[0090] Specifically, the formula for calculating the bending force of the work roll at low speed is as follows: (7); in, For low-speed operation, the bending force of the work roll is... This refers to the bending force of the work roll under the current low-speed condition. This is the compensation amount for the bending force of the work roll after scanning. Add bending roller force to the low-speed state after scanning.

[0091] It should be noted that, as Figure 7 As shown, when the work roll bending force is used for dynamic closed-loop control of cold rolling crown at low speed, it continues to determine whether the rolling speed is ≥200mpm. If not, it sets... If so, let And judge Is it less than 0? If so, determine... If the value is greater than 0, continue to calculate the additional bending force in the low-speed state after scanning; if not, trigger the adjustment of the steady-state work roll bending force compensation coefficient, setting the bending force compensation coefficient to... , Continue with the dynamic closed-loop control process for the cold rolling crown caused by the steady-state work roll bending force.

[0092] The cold-rolled crown dynamic closed-loop control method provided in this embodiment matches differentiated control algorithms for different rolling states. During steady-state rolling, speed adaptive control is activated by combining rolling speed, crown deviation, and basic parameters of different steel grades to achieve dynamic adaptation of bending roll force compensation with rolling speed and crown deviation. During low-speed conditions, acceleration and deceleration protection control is activated based on the parameters of different steel grades to adjust the compensation strategy accordingly. This ensures accurate correction of cold-rolled crown under steady-state conditions and reduces the risk of strip breakage through protective compensation during acceleration and deceleration. At the same time, the integration of basic parameters of different steel grades allows both algorithms to adapt to the rolling characteristics of different steel grades. Ultimately, it achieves accurate, differentiated, and dynamic bending roll force compensation under different states and different steel grades, effectively improving the consistency of cold-rolled crown throughout the coil and the stability of the production process.

[0093] As one or more specific application embodiments of the present invention, the dynamic closed-loop control method for cold rolling crown provided by the present invention will be further described in detail in conjunction with specific application scenarios, as follows: For a 1420mm cold rolling six-stand mill, a speed-adaptive dynamic closed-loop control system for cold rolling crown was developed based on data from the mill exit pickling edge drop meter to achieve real-time feedback control of the bending force of the work rolls on stands S1 / S2. The tested grades were W1300, W800, and W600, and the bending force compensation coefficients and compensation limits for these three grades are shown in Table 1. From W1300 to W600, the material strength increases sequentially, making it more difficult to control the difference in thickness between sheets. Therefore, a larger bending force compensation coefficient and a more relaxed bending force compensation limit are needed to fully utilize the efficiency of the work roll bending force in regulating cold rolling crown.

[0094] Table 1 Compensation coefficients and compensation limits for bending rolls of different steel grades

[0095] The target crown value for cold rolling crown is set to 5μm, the sensor scanning cycle is 10ms, the incremental force δ of the additional bending roll force in low speed state is 0.1kN, and the limit value of the additional bending roll force in low speed state is 50kN.

[0096] Five coils of each grade (W1300, W800, and W600) were tested, and the changes in S1 / S2 work roll bending force and the overall crown fluctuation before and after the implementation of the dynamic closed-loop control method for cold rolling crown were compared. As shown in Table 2, Figures 8(a), 8(b), 8(c), 8(d), 8(e), and 8(f), and Figures 9(a), 9(b), and 9(c), it can be seen that after the implementation of the dynamic closed-loop control system for cold rolling crown, the steady-state work roll bending force adjustment of the S1 / S2 stands for each grade was higher than that of the conventional coil. Furthermore, at low speeds at the beginning and end, the bending force adjustment of the test coil could be quickly reduced to within a safe value, while the conventional coil maintained a bending force similar to that at high speeds, resulting in a high risk of strip breakage. The average hit rate of cold rolling crown ≤5μm for the test coil was approximately 10 percentage points higher than that for the conventional coil, indicating that this method has significant implications for improving the overall crown consistency of cold-rolled silicon steel.

[0097] Table 2 Comparison of indicators before and after the implementation of the cold rolling crown closed-loop control method

[0098] UCM mills lack work roll shifting capabilities, hindering edge drop closed-loop control and resulting in a lack of effective control methods to improve overall crown hit rate. This embodiment provides a dynamic closed-loop control method for cold rolling crown, which uses real-time compensation of the bending force of the work rolls on stands S1 / S2 based on measured cold rolling crown data from the edge drop meter at the mill exit, thereby improving the hit rate of the same-plate difference in silicon steel. Simultaneously, to ensure normal production, a synchronous speed adaptive mechanism, an abnormal signal shielding mechanism, and acceleration / deceleration protection control algorithm are implemented, balancing same-plate difference control level and stable production. Since different silicon steel grades have varying strengths, rolling forces, and the difficulty of same-plate difference control differs, a grade-specific compensation operation is adopted to finely set the bending force compensation coefficient for different steel grades according to actual needs.

[0099] This embodiment also provides a cold-rolled crown dynamic closed-loop control device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0100] This embodiment provides a dynamic closed-loop control device for cold rolling crown, applied to a UCM rolling mill, such as... Figure 10 As shown, it includes: The crown deviation calculation module 1001 is used to collect the measured value of the cold-rolled crown of the steel to be rolled and the rolling speed, and to calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value.

[0101] The rolling state determination module 1002 is used to determine the current rolling state based on the rolling speed.

[0102] The dynamic closed-loop control module 1003 is used to dynamically compensate the bending force of the work roll of the UCM mill based on the rolling speed, crown deviation and preset basic parameters for different steel grades, using a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm under the current rolling state, so as to perform dynamic closed-loop control of the cold rolling crown.

[0103] In some optional implementations, the convexity deviation calculation module 1001 includes: The crown deviation calculation unit is used to calculate the difference between the measured crown value and the target crown value of cold rolling, and obtain the crown deviation.

[0104] In some optional implementations, the rolling state determination module 1002 includes: The first judgment unit is used to determine that the rolling speed is greater than or equal to a preset speed threshold, and then to determine that the rolling state is steady. The second judgment unit is used to determine that when the rolling speed is less than the preset speed threshold, it is in the acceleration / deceleration stage, i.e., the low-speed state.

[0105] In some optional implementations, the dynamic closed-loop control of cold rolling crown further includes: The steel grade compensation operation module is used to preset the basic parameters of the steel grade in the following way: based on the strength characteristics of the steel grade to be rolled, the corresponding basic parameters of the steel grade are set through the steel grade compensation operation. The basic parameters of the steel grade include the speed compensation coefficient of the bending force of the work roll, the crown compensation coefficient, the steady-state bending force compensation limit, and the low-speed bending force compensation limit.

[0106] In some alternative implementations, the dynamic closed-loop control module 1003 includes: The speed adaptive control unit is used to dynamically compensate for the bending force of the work rolls of the UCM mill under steady-state rolling conditions by using a speed adaptive control algorithm based on rolling speed, crown deviation and preset basic parameters for different steel grades.

[0107] The acceleration / deceleration protection control unit is used to dynamically compensate the bending force of the work rolls of the UCM mill at low speed by using an acceleration / deceleration protection control algorithm based on preset basic parameters for different steel grades.

[0108] In some alternative implementations, the speed adaptive control unit includes: The steady-state work roll bending force compensation calculation subunit is used to calculate the steady-state work roll bending force compensation based on rolling speed, crown deviation, speed compensation coefficient, and crown compensation coefficient.

[0109] The subunit for calculating the bending force compensation of the work roll after scanning is used to calculate the bending force compensation of the work roll after scanning based on the steady-state bending force compensation and the bending force of the work roll before scanning; the bending force compensation of the work roll after scanning is within the steady-state bending force compensation limit.

[0110] The steady-state work roll bending force calculation subunit is used to calculate the steady-state work roll bending force based on the work roll bending force compensation amount after scanning and the work roll bending force under steady-state rolling conditions, and to perform dynamic closed-loop control of cold rolling crown based on the steady-state work roll bending force.

[0111] In some alternative implementations, the speed adaptive control unit further includes: The abnormal signal shielding subunit is used to automatically shield the measured value of cold rolling crown corresponding to the crown deviation when the absolute value of the crown deviation is greater than or equal to the preset deviation threshold, so that the corresponding measured value of cold rolling crown does not participate in the dynamic compensation operation of the bending roll force of the work roll of the UCM mill.

[0112] In some alternative implementations, the acceleration / deceleration protection control unit includes: The compensation coefficient reduction subunit is used to reduce the velocity compensation coefficient and convexity compensation coefficient to a preset multiple.

[0113] The subunit for calculating the additional bending force of the work roll at low speed after scanning is used to calculate the bending force compensation amount of the work roll after scanning based on the reduced convexity compensation coefficient and speed compensation coefficient; it calculates the additional bending force of the work roll at low speed after scanning based on the adjustment rate of the additional bending force at low speed and the additional bending force of the work roll at low speed before scanning; the additional bending force of the work roll at low speed is within the compensation limit of the work roll at low speed.

[0114] The low-speed working roll bending force calculation subunit is used to calculate the low-speed working roll bending force based on the low-speed additional bending force, the working roll bending force compensation amount after scanning, and the working roll bending force under the current low-speed condition, and to perform dynamic closed-loop control of the cold rolling crown based on the low-speed working roll bending force.

[0115] The cold-rolled crown dynamic closed-loop control device provided in this embodiment of the invention can execute the cold-rolled crown dynamic closed-loop control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method. Further functional descriptions of the above modules and units are the same as in the corresponding embodiments described above, and will not be repeated here.

[0116] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0117] The following is a detailed reference. Figure 11The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, a graphics processing unit, etc.) 1101, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1102 or a program loaded from memory 1108 into random access memory (RAM) 1103. The RAM 1103 also stores various programs and data required for the operation of the electronic device. The processor 1101, ROM 1102, and RAM 1103 are interconnected via a bus 1104. An input / output (I / O) interface 1105 is also connected to the bus 1104.

[0118] Typically, the following devices can be connected to I / O interface 1105: input devices 1106 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 1107 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 1108 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1109. Communication device 1109 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 11 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0119] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 1109, or installed from a memory 1108, or installed from a ROM 1102. When the computer program is executed by the processor 1101, it performs the functions defined in the cold rolling crown dynamic closed-loop control method of the embodiments of the present invention.

[0120] Figure 11 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0121] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the cold-rolled crown dynamic closed-loop control method shown in the above embodiments is implemented.

[0122] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0123] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dynamic closed-loop control method for cold-rolled crown, characterized in that, Applied to a UCM rolling mill, the method includes: Collect the measured value of the cold-rolled crown and the rolling speed of the steel grade to be rolled, and calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value; The current rolling state is determined based on the rolling speed; Based on the rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under the current rolling conditions, so as to achieve dynamic closed-loop control of the cold rolling crown.

2. The dynamic closed-loop control method for cold-rolled crown according to claim 1, characterized in that, The crown deviation is calculated based on the measured value of the cold-rolled crown and the target crown value, including: The difference between the measured value of the cold-rolled crown and the target crown value is calculated to obtain the crown deviation.

3. The dynamic closed-loop control method for cold-rolled crown according to claim 1, characterized in that, Determining the current rolling state based on the rolling speed includes: When the rolling speed is greater than or equal to a preset speed threshold, it is determined to be a steady-state rolling state; When the rolling speed is less than the preset speed threshold, it is determined to be in the acceleration / deceleration stage, i.e., the low-speed state.

4. The dynamic closed-loop control method for cold-rolled crown according to claim 3, characterized in that, The method further includes: presetting basic parameters for different steel grades using the following method: Based on the strength characteristics of the steel grade to be rolled, corresponding basic parameters for each steel grade are set through a steel grade compensation operation. These basic parameters include the speed compensation coefficient, crown compensation coefficient, steady-state bending force compensation limit, and low-speed bending force compensation limit of the work roll bending force.

5. The dynamic closed-loop control method for cold-rolled crown according to claim 4, characterized in that, Based on the rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under the current rolling conditions, including: Based on the rolling speed, crown deviation and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls of the UCM mill under steady-state rolling conditions. Based on preset basic parameters for different steel grades, an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill at low speeds.

6. The dynamic closed-loop control method for cold-rolled crown according to claim 5, characterized in that, Based on the rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under steady-state rolling conditions, including: The steady-state work roll bending force compensation is calculated based on rolling speed, crown deviation, speed compensation coefficient, and crown compensation coefficient. The working roll bending force compensation amount after scanning is calculated based on the steady-state working roll bending force compensation amount and the working roll bending force before scanning; the working roll bending force compensation amount after scanning is within the steady-state bending force compensation limit. Based on the work roll bending force compensation amount after scanning and the work roll bending force under the current steady-state rolling state, the steady-state work roll bending force is calculated, and the cold rolling crown is dynamically closed-loop controlled based on the steady-state work roll bending force.

7. The dynamic closed-loop control method for cold-rolled crown according to claim 5, characterized in that, Based on the aforementioned rolling speed, crown deviation, and preset basic parameters for different steel grades, a speed adaptive control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill under steady-state rolling conditions. This also includes: When the absolute value of the crown deviation is greater than or equal to the preset deviation threshold, the measured value of cold rolling crown corresponding to the crown deviation is automatically shielded, so that the corresponding measured value of cold rolling crown does not participate in the dynamic compensation operation of the bending roll force of the work roll of the UCM mill.

8. The dynamic closed-loop control method for cold-rolled crown according to claim 6, characterized in that, Based on preset basic parameters for different steel grades, an acceleration / deceleration protection control algorithm is used to dynamically compensate for the bending force of the work rolls in the UCM mill at low speeds, including: Reduce the speed compensation coefficient and convexity compensation coefficient to a preset multiple; The compensation amount of bending force of the work roll after scanning is calculated based on the reduced convexity compensation coefficient and speed compensation coefficient; the compensation amount of bending force of the work roll after scanning is calculated based on the adjustment rate of the additional bending force of the work roll in the low-speed state and the additional bending force of the work roll in the low-speed state before scanning; the additional bending force of the work roll in the low-speed state is within the compensation limit of the low-speed bending force. Based on the additional bending force at low speed, the compensation amount of bending force of the work roll after scanning, and the bending force of the work roll at the current low speed, the bending force of the work roll at low speed is calculated, and the cold rolling crown is dynamically controlled in a closed loop based on the bending force of the work roll at low speed.

9. A dynamic closed-loop control device for cold-rolled crown, characterized in that, Applied to a UCM rolling mill, the apparatus includes: The crown deviation calculation module is used to collect the measured value of the cold-rolled crown of the steel to be rolled and the rolling speed, and to calculate the crown deviation based on the measured value of the cold-rolled crown and the target crown value. A rolling state determination module is used to determine the current rolling state based on the rolling speed; The dynamic closed-loop control module is used to dynamically compensate the bending force of the work rolls of the UCM mill based on the rolling speed, crown deviation and preset basic parameters for different steel grades, using a speed adaptive control algorithm or an acceleration / deceleration protection control algorithm under the current rolling state, so as to perform dynamic closed-loop control of the cold rolling crown.

10. An electronic device, characterized in that, include: A memory and a processor are interconnected, the memory stores computer instructions, and the processor executes the computer instructions to perform the cold rolling crown dynamic closed-loop control method according to any one of claims 1 to 8.

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