Intelligent preset method and system for rolling of differential thickness plate based on multi-model coupling

Abstract

The application discloses a multi-model coupling-based intelligent preset method and system for differential-thickness plate rolling, and relates to the technical field of differential-thickness plate plastic forming. The method comprises the following steps: S1, collecting process setting data and rolling feedback data, performing pretreatment, identifying the equal-thickness section and the wedge-shaped transition section, and establishing a set point number; S2, performing rolling contact state evaluation and rolling stability evaluation on each set point, performing continuity verification in the wedge-shaped transition section, generating an initial preset parameter sequence of the whole plate, and performing differential-thickness plate rolling; S3, analyzing the parameter variation continuity in the set point window, and evaluating the thickness-shape coupling conflict degree of the current rolling state; and S4, predicting the plate shape instability risk, correcting the preset parameters of the subsequent set points, and verifying the corrected parameters. The method solves the problems that in the wedge-shaped transition section rolling of the differential-thickness plate, the thickness preset parameter variation leads to that the thickness meets the standard but the plate shape deteriorates, and the plate shape defects are difficult to prevent and correct in time.

Description

Technical Field

[0001] This invention relates to the field of plastic forming technology for differential thickness plates, specifically to an intelligent preset method and system for rolling differential thickness plates based on multi-model coupling. Background Technology

[0002] With the increasing demand for lightweighting of automobiles, integrated structural components, and improved material utilization, differential thickness plates with varying thicknesses along their length are increasingly used in areas such as body reinforcements and load-bearing structural components. Their production process typically involves thickness specification setting, roll gap control, rolling force control, speed control, plate shape inspection, and coordinated control of the rolling mill actuators, placing high demands on the stability of the rolling process, dimensional accuracy, and finished product flatness.

[0003] For example, Chinese patent CN110837675B discloses an optimized fracture criterion for predicting the fracture of differentially thick plates. The method includes acquiring the stress state of the differentially thick plate during plastic forming; establishing a damage fracture criterion for the plate based on the stress state; acquiring nonlinear damage fracture parameters and the nonlinear relationship between damage variables and true strain during plastic forming; optimizing the damage fracture criterion based on the nonlinear damage fracture parameters and the nonlinear relationship to obtain an optimized fracture criterion; and performing a limit prediction of the fracture behavior of the differentially thick plate during plastic forming based on the optimized fracture criterion to obtain the prediction result. This invention can establish an optimized universal fracture criterion that conforms to the fracture behavior and fracture mechanism of rolled differentially thick plates, and can perform a limit prediction of the fracture behavior of differentially thick plates during plastic forming, avoiding the influence of macroscopic thickness differences on the limit prediction of the forming fracture of differentially thick plates.

[0004] For example, Chinese patent CN112906183B discloses a method for calculating the force and energy parameters of thick plate serpentine differential temperature rolling at the same speed and different diameters. The method includes: S1, solving for the dimensions of the deformation zones based on the geometric relationship of the deformation zones in serpentine differential temperature rolling at the same speed and different diameters; S2, dividing the deformation zones of the workpiece into zones and layers based on the deformation resistance gradient and the neutral point positions at the upper and lower work rolls, and solving for the yield criteria of the workpiece in each deformation zone by calculating the equivalent shear yield stress; S3, constructing a unit pressure solution model for each deformation zone based on the roll diameter ratio and the yield criteria, solving for the integral constants of each deformation zone using boundary conditions, and constructing a solution model for the rolling force and rolling torque based on the integral constants, the unit pressure of each deformation zone, and the dimensions of the deformation zone, thus completing the calculation of the rolling force and rolling torque in serpentine differential temperature rolling at the same speed and different diameters. This invention can accurately calculate the rolling force and rolling torque in serpentine differential temperature rolling at the same speed and different diameters, providing a theoretical basis for the design of rolling mills and the formulation of rolling processes.

[0005] However, existing differential thickness plate presets typically focus on thickness targets, achieving the longitudinal thickness curve through a combination of parameters such as roll gap, rolling force, and speed. Shape control relies on stabilization through transverse shape measurement and roll system adjustment. However, in wedge transition sections or during dynamic load changes, the roll gap curvature, rolling force variation rate, or speed settings used to meet the longitudinal thickness target may alter transverse metal flow and residual stress distribution, increasing the shape instability threshold and inducing defects such as edge waviness, center waviness, and quarter waviness; thus, a preset conflict arises where "thickness meets the target but shape deteriorates." Shape defects lead to unsatisfactory finished product flatness, reduced yield in subsequent processes, and these defects often concentrate in transition sections, making them difficult to repair afterward.

[0006] Therefore, in order to address the above problems, there is an urgent need for an intelligent preset method and system for differential thickness plate rolling based on multi-model coupling. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an intelligent preset method and system for differential thickness plate rolling based on multi-model coupling. This solves the problem that changes in the preset thickness parameters during differential thickness plate wedge transition section rolling lead to thickness compliance but plate shape deterioration, and plate shape defects are difficult to prevent and correct in a timely manner.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an intelligent preset method for differential thickness plate rolling based on multi-model coupling, comprising the following steps: S1, collecting process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying equal thickness sections and wedge transition sections, and establishing corresponding setting point numbers; S2, based on the setting point numbers of equal thickness sections and wedge transition sections, evaluating the rolling mechanical state and thickness change adjustment state of each setting point using the corresponding process setting data, and performing continuity verification on adjacent setting points within the wedge transition section, generating an initial preset parameter sequence for the entire plate based on the evaluation results and continuity verification results, and sending it to the rolling mill control module to execute differential thickness plate rolling; S3, combining the rolling feedback data and the initial preset parameters for the entire plate, analyzing the continuity of parameter changes within the setting point window, and evaluating the degree of thickness-shape coupling conflict in the current rolling state; S4, predicting the plate shape instability risk based on the degree of thickness-shape coupling conflict, correcting the preset parameters of subsequent setting points based on the predicted plate shape instability risk and the degree of thickness-shape coupling conflict, and verifying the corrected parameters based on thickness constraints.

[0009] Furthermore, the specific process of collecting process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying the equal thickness section and the wedge transition section, and establishing corresponding setting point numbers is as follows: Reading process setting data, which includes: inlet thickness specification value, target thickness setting value sequence, wedge transition section length, equal thickness section length, plate width, yield strength, roll radius, mill equivalent stiffness, and reference rolling speed; Real-time acquisition of rolling feedback data, which includes: plate shape transverse tension deviation value, exit thickness measurement value, strip longitudinal position, and sampling timestamp; Using the sampling timestamp... As a time index, the rolling feedback data is time-aligned, and the longitudinal position of the strip is used as a position index to associate the rolling feedback data with the corresponding longitudinal position of the strip. Based on the target thickness setting value sequence, the length of the wedge transition section, and the length of the equal thickness section, the equal thickness section and the wedge transition section along the rolling direction of the differential thickness plate are determined. Within the equal thickness section and the wedge transition section, setting point numbers are established according to the longitudinal position sequence of the strip and at fixed longitudinal distance intervals, and each setting point number is associated with the corresponding target thickness setting value. A differential thickness plate rolling preset database is established to store the original and pre-processed process setting data and rolling feedback data.

[0010] Furthermore, based on the setpoint numbers of the equal-thickness section and the wedge transition section, the specific process for evaluating the rolling mechanical state and thickness change adjustment state of each setpoint using the corresponding process setting data is as follows: Evaluating the rolling mechanical state includes: for each setpoint number in the equal-thickness section and the wedge transition section, subtracting the target thickness setting value of the corresponding setpoint from the inlet thickness specification value to obtain the target reduction amount of the setpoint; multiplying the roll radius by the target reduction amount and taking the square root to obtain the rolling contact arc length of the setpoint; multiplying the yield strength, plate width, and rolling contact arc length to obtain the initial target rolling force of the setpoint; using... The initial target rolling force is divided by the sum of the mill's equivalent stiffness and the smallest positive number to obtain the roll elastic compression compensation amount; the target thickness setting value corresponding to the set point is added to the roll elastic compression compensation amount to obtain the initial target roll gap value of the set point; the thickness change adjustment state is evaluated, including: calculating the difference between the target thickness setting value between the current set point and the previous set point to obtain the target thickness change amount; the absolute value of the target thickness change amount is divided by the sum of the target thickness setting value of the equal thickness section and the smallest positive number to obtain the relative intensity of the thickness change; the reference rolling speed is divided by the relative intensity of the thickness change to obtain the initial target rolling speed.

[0011] Furthermore, the specific process for continuity verification of adjacent set points within the wedge transition section is as follows: Within the wedge transition section, adjacent set points are verified for continuity according to their set point numbers. For each set point number within the wedge transition section, the initial target roll gap value of the current set point is subtracted from the initial target roll gap value of the previous set point to obtain the target roll gap change. The initial target rolling force of the current set point is subtracted from the initial target rolling force of the previous set point to obtain the target rolling force change. The initial target rolling speed of the current set point is subtracted from the initial target rolling speed of the previous set point to obtain the target rolling speed change. When the absolute value of the target roll gap change, target rolling force change, or target rolling speed change is greater than the corresponding change threshold, a new intermediate set point is inserted at the midpoint of the adjacent set points. The target thickness setting value of the new intermediate set point is the average of the target thickness setting values ​​of the two adjacent set points, and the initial target roll gap value, initial target rolling force, and initial target rolling speed corresponding to the new intermediate set point are recalculated.

[0012] Furthermore, based on the evaluation results and continuity verification results, an initial preset parameter sequence for the entire plate is generated and sent to the rolling mill control module to execute the specific process of differential thickness plate rolling: In the equal thickness section, the target thickness change is zero, and the rolling speed is maintained at the reference rolling speed; in the wedge transition section, the rolling speed is set to the corresponding initial target rolling speed; according to the order of the set point numbers, the initial target roll gap value, initial target rolling force, and rolling speed corresponding to each set point in the equal thickness section and the wedge transition section are arranged and associated with the corresponding set point number and the longitudinal position of the strip; the initial target roll gap value sequence is sent to the hydraulic pressing control unit, the initial target rolling force sequence is sent to the rolling force control unit, and the rolling speed sequence is sent to the main drive speed control unit, as the initial preset parameters for the entire plate when differential thickness plate rolling begins, and differential thickness plate rolling is executed.

[0013] Furthermore, combining rolling feedback data and initial preset parameters for the entire plate, the specific process for analyzing the continuity of parameter changes within the setpoint window and evaluating the degree of thickness-shape coupling conflict in the current rolling state is as follows: Based on the currently completed rolling sliding setpoint window, the sum of edge tension deviation, middle tension deviation, and quarter-width tension deviation is calculated according to the transverse tension deviation value of the plate shape to obtain the total transverse plate shape deviation; the absolute values ​​of the transverse tension deviation values ​​of all detection points in the plate width direction are taken and averaged to obtain the average absolute tension deviation; the total transverse plate shape deviation is divided by the sum of the average absolute tension deviation and the smallest positive number, and then one is added to obtain the plate shape deviation amplification; for the currently completed rolling setpoint, the exit thickness measurement value corresponding to the setpoint is subtracted from the target thickness setting value to obtain the thickness deviation; and the target roll gap change, target rolling force change, and target... are calculated. The following calculations are performed: 1) Calculate the rolling speed variation; 2) Multiply the absolute value of the target roll gap variation by the mill's equivalent stiffness, then add a minimum positive number to obtain the roll gap load explanation; 3) Divide the absolute value of the target rolling force variation by the roll gap load explanation, add one, and take the natural logarithm to obtain the load mutation amplification; 4) Divide the absolute value of the target rolling speed variation by the sum of the initial target rolling speed at the current set point and the minimum positive number, then add one to obtain the speed disturbance amplification; 5) Multiply the shape deviation amplification, load mutation amplification, and speed disturbance amplification together to obtain the shape disturbance comprehensive amount; 6) Divide the absolute value of the thickness deviation by the sum of the target thickness set value at the corresponding set point and the minimum positive number, then add one to obtain the thickness deviation suppression amount; 7) Divide the shape disturbance comprehensive amount by the thickness deviation suppression amount to obtain the thickness-shape conflict intermediate value, and perform a hyperbolic tangent mapping on the thickness-shape conflict intermediate value to obtain the thickness-shape coupling conflict discrimination value.

[0014] Furthermore, the specific process for predicting the risk of plate instability based on the degree of thickness coupling conflict is as follows: The thickness coupling conflict discrimination value is compared with the conflict discrimination threshold: When the thickness coupling conflict discrimination value is less than the conflict discrimination threshold, it is determined that there is no thickness coupling conflict in the currently completed rolling section, and the initial target roll gap value, initial target rolling force, and rolling speed corresponding to the subsequent unrolled set point remain unchanged; When the thickness coupling conflict discrimination value is greater than or equal to the conflict discrimination threshold, it is determined that there is a thickness coupling conflict in the currently completed rolling section; Based on the longitudinal position of the strip corresponding to the currently completed rolling section, the adjacent set point number of the subsequent unrolled section is determined and marked as the plate instability risk set point.

[0015] Furthermore, regarding the prediction of plate instability risk, the specific process of correcting the preset parameters of subsequent set points based on the degree of thickness-shape coupling conflict is as follows: Subtract the conflict discrimination threshold from the thickness-shape coupling conflict discrimination value to obtain the conflict excess; divide the conflict excess by the sum of the thickness-shape coupling conflict discrimination value and the smallest positive number to obtain the correction ratio; for the plate instability risk set point, multiply the target roll gap change at the plate instability risk set point by the correction ratio to obtain the roll gap change correction; subtract the roll gap change correction from the initial target roll gap value at the plate instability risk set point to obtain the corrected target roll gap value; multiply the target rolling force change at the plate instability risk set point by the correction ratio to obtain the rolling force change correction; subtract the rolling force change correction from the initial target rolling force at the plate instability risk set point to obtain the corrected target rolling force; multiply the target rolling speed change at the plate instability risk set point by the correction ratio to obtain the speed change correction; subtract the speed change correction from the rolling speed at the plate instability risk set point to obtain the corrected rolling speed.

[0016] Furthermore, the specific process for verifying the corrected parameters based on thickness constraints is as follows: The roll elastic compression compensation is recalculated based on the corrected target rolling force and the mill's equivalent stiffness. The target thickness setting value corresponding to the plate instability risk setting point is added to the recalculated roll elastic compression compensation to obtain the thickness constraint roll gap value. The absolute difference between the corrected target roll gap value and the thickness constraint roll gap value is calculated. If the absolute difference is less than or equal to the roll gap allowable deviation threshold, the corrected target roll gap value is retained; otherwise, the thickness constraint roll gap value is used as the final corrected target roll gap value. The preset parameters corresponding to the plate instability risk setting point are updated based on the final corrected target roll gap value, the corrected target rolling force, and the corrected rolling speed.

[0017] The second aspect of this invention provides an intelligent preset system for differential thickness plate rolling based on multi-model coupling, comprising: a rolling data acquisition and processing module for acquiring process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying equal thickness sections and wedge transition sections, and establishing corresponding setting point numbers; and a whole plate initial preset parameter generation module for evaluating the rolling mechanical state and thickness change adjustment state of each setting point based on the setting point numbers of equal thickness sections and wedge transition sections, using the corresponding process setting data, and performing continuity verification on adjacent setting points within the wedge transition section. Based on the evaluation results and continuity verification results, an initial preset parameter sequence for the entire plate is generated and sent to the rolling mill control module to execute differential thickness plate rolling. The rolled feedback prediction module is used to combine rolling feedback data and the initial preset parameters of the entire plate to analyze the continuity of parameter changes within the set point window and assess the degree of thickness-shape coupling conflict in the current rolling state. The thickness-shape conflict identification and correction module is used to predict the plate shape instability risk based on the degree of thickness-shape coupling conflict, and to correct the preset parameters of subsequent set points based on the predicted plate shape instability risk and the degree of thickness-shape coupling conflict, and to verify the corrected parameters based on thickness constraints.

[0018] The present invention has the following beneficial effects:

[0019] (1) In this invention, the target thickness, longitudinal position of the strip and rolling parameters are associated by setting point numbering to generate an initial preset parameter sequence for the whole plate, so that the roll gap, rolling force and rolling speed can be continuously matched with the equal thickness section and the wedge transition section.

[0020] (2) In this invention, the roll gap, rolling force and speed changes of adjacent set points of the wedge transition section are continuously checked, and an intermediate set point is inserted when the change is too large, so as to reduce the impact of dynamic load and speed change.

[0021] (3) The present invention obtains the thickness coupling conflict discrimination value by combining the outlet thickness measurement value, the plate shape transverse tension deviation value and the preset parameter change value, which can identify the hidden conflict where the thickness control is normal but the plate shape tends to be unstable.

[0022] (4) In this invention, the roll gap, rolling force and speed of the subsequent setting point are corrected according to the degree of thickness coupling conflict, and the roll gap value is verified by the thickness constraint, so as to reduce the risk of edge wave, middle wave and quarter wave while ensuring the target thickness.

[0023] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] Figure 1 The flowchart shows the intelligent preset method for differential thickness plate rolling based on multi-model coupling.

[0025] Figure 2 This is a structural diagram of an intelligent pre-set system for differential thickness plate rolling based on multi-model coupling;

[0026] Figure 3 This is a schematic diagram illustrating the evolution trend of the thick coupling conflict discriminant value;

[0027] Figure 4 A framework diagram of the intelligent preset workflow for rolling differential thickness plates. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. As those skilled in the art will understand, the described embodiments are only some embodiments of the present invention, and 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] Please see Figures 1-4 This invention provides a technical solution: an intelligent preset method for differential thickness plate rolling based on multi-model coupling, such as... Figure 1 As shown, the process includes the following steps: S1, collecting process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying the equal thickness section and the wedge transition section, and establishing corresponding setting point numbers; S2, based on the setting point numbers of the equal thickness section and the wedge transition section, evaluating the rolling mechanical state and thickness change adjustment state of each setting point using the corresponding process setting data, and performing continuity verification on adjacent setting points within the wedge transition section, generating the initial preset parameter sequence for the entire plate based on the evaluation results and continuity verification results, and sending it to the rolling mill control module to execute differential thickness plate rolling; S3, combining the rolling feedback data and the initial preset parameters for the entire plate, analyzing the continuity of parameter changes within the setting point window, and evaluating the degree of thickness-shape coupling conflict in the current rolling state; S4, predicting the plate shape instability risk based on the degree of thickness-shape coupling conflict, correcting the preset parameters of subsequent setting points based on the predicted plate shape instability risk and the degree of thickness-shape coupling conflict, and verifying the corrected parameters based on thickness constraints.

[0030] Specifically, the process of collecting process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying the equal thickness section and the wedge transition section, and establishing corresponding setting point numbers is as follows: Read the process setting data, which includes: entrance thickness specification value, target thickness setting value sequence, wedge transition section length, equal thickness section length, plate width, yield strength, roll radius, mill equivalent stiffness, and reference rolling speed; among which, the entrance thickness specification value, target thickness setting value sequence, wedge transition section length, equal thickness section length, plate width, and yield strength... The roll radius is obtained from the product specification data in the rolling plan and the process specification of the differential thickness plate product; the roll radius is obtained from the actual measured radius record of the roll in the roll management system; the mill equivalent stiffness is obtained from the mill equipment calibration data; the reference rolling speed is determined by the rolling speed system in the process specification of the differential thickness plate product and serves as the speed reference in the overall plate preset calculation; when the mill equivalent stiffness, roll radius and reference rolling speed change due to equipment maintenance, roll replacement, roll grinding and process specification updates, the updated process setting data is read to ensure that the preset calculation is consistent with the current mill status. Real-time rolling feedback data is collected, including: transverse tension deviation value, exit thickness measurement value, strip longitudinal position, and sampling timestamp. The transverse tension deviation value is the tension deviation data corresponding to each detection point in the width direction output by the shape gauge, specifically the difference between the tension value at each detection point in the width direction and the average tension value across the entire strip width. The exit thickness measurement value is collected by the exit thickness gauge, and the strip longitudinal position is obtained from the position tracking data output by the production line encoder. The sampling timestamp is generated by the data acquisition system to identify the collection time of each set of rolling feedback data. The rolling feedback data is time-aligned using the sampling timestamp as a time index, and associated with the corresponding strip longitudinal position using the strip longitudinal position as a position index. Specifically, the transverse tension deviation value, exit thickness measurement value, and strip longitudinal position of the same sampling timestamp are considered as the same set of rolling feedback data. The position of the differential thickness plate length direction corresponding to the rolling feedback data is determined according to the strip longitudinal position, avoiding data mismatch caused by inconsistent sampling times of different detection devices. Based on the target thickness setting sequence, the length of the wedge transition section, and the length of the equal thickness section, the equal thickness section and the wedge transition section along the rolling direction of the differential thickness plate are determined. Specifically, the determination is made by observing the change in target thickness at adjacent positions in the target thickness setting sequence: if the difference between multiple adjacent target thickness setting values ​​is zero, it indicates that the target thickness setting values ​​are continuously consistent, and the corresponding longitudinal interval is determined to be the equal thickness section; if the difference between multiple adjacent target thickness setting values ​​is greater than zero or less than zero, it indicates that the target thickness setting values ​​are continuously increasing or decreasing along the rolling direction, and the corresponding longitudinal interval is determined to be the wedge transition section. The length of the wedge transition section and the length of the equal thickness section are used to define the start and end positions of the corresponding longitudinal interval to ensure that the segment division is consistent with the product thickness design.Within the equal-thickness section and the wedge-shaped transition section, setpoint numbers are established according to the longitudinal position sequence of the strip and at fixed longitudinal distance intervals. Each setpoint number is then associated with its corresponding target thickness setpoint. The fixed longitudinal distance interval is preferably determined based on the positional resolution of the target thickness setpoint sequence, preferably ranging from 50mm to 500mm. A smaller fixed longitudinal distance interval is selected when the wedge-shaped transition section is short, and a larger fixed longitudinal distance interval is selected when the wedge-shaped transition section is long. For each setpoint number, the corresponding target thickness setpoint is read from the target thickness setpoint sequence according to its corresponding strip longitudinal position, ensuring that each setpoint has a clear longitudinal position and target thickness. A differential-thickness plate rolling preset database is established to store the original and pre-processed process setting data and rolling feedback data. It also synchronously stores the start and end positions of the equal-thickness section, the start and end positions of the wedge-shaped transition section, the setpoint number, the corresponding strip longitudinal position of the setpoint, and the corresponding target thickness setpoint. This database is used for subsequent generation of initial preset parameters for the entire plate, prediction of rolled feedback, and correction of subsequent unrolled setpoints.

[0031] In this implementation plan, by clarifying the sources of process setting data and rolling feedback data, and completing data alignment and position association based on sampling timestamps and longitudinal positions of the strip, the rolling data of differential thickness plates can be accurately mapped to specific longitudinal sections. At the same time, based on the target thickness setting value sequence, equal thickness sections and wedge transition sections are identified, and the setting point number and target thickness association relationship are established. This provides a unified, accurate, and traceable data foundation for subsequent generation of whole-plate preset parameters, rolled feedback analysis, and correction of unrolled sections, thereby improving the reliability and feasibility of differential thickness plate rolling preset control.

[0032] Specifically, based on the setpoint numbers of the equal-thickness section and the wedge transition section, the specific process for evaluating the rolling mechanical state and thickness change adjustment state of each setpoint using the corresponding process setting data is as follows: Evaluating the rolling mechanical state includes: for each setpoint number in the equal-thickness section and the wedge transition section, subtracting the target thickness setting value of the corresponding setpoint from the inlet thickness specification value to obtain the target reduction amount for the setpoint; the target reduction amount is used to characterize the thickness reduction of the sheet metal at the setpoint from the inlet thickness to the target thickness. The larger the target reduction amount, the greater the degree of plastic deformation corresponding to the setpoint. Multiplying the roll radius by the target reduction amount and taking the square root yields the rolling contact arc length of the setpoint; the rolling contact arc length is determined based on the contact arc approximation relationship model in rolling mechanics and is used to characterize the contact length between the roll and the sheet metal in the deformation zone; under small reduction rolling conditions, the contact arc length can be approximated by taking the square root of the product of the roll radius and the reduction amount, thus allowing the difference in reduction amount at different setpoints to be reflected in the contact deformation range. Multiplying the yield strength, plate width, and rolling contact arc length yields the initial target rolling force at the set point. The yield strength characterizes the material deformation resistance required to induce plastic deformation in the plate. The plate width and rolling contact arc length form the rolling contact area; multiplying these two factors by the yield strength yields the initial target rolling force acting on the set point. This process uses an approximate rolling force estimation model based on average contact pressure, which can serve as the initial control target for rolling force in the preset stage. Dividing the initial target rolling force by the sum of the mill's equivalent stiffness and a minimum positive number yields the roll elastic compression compensation. The mill's equivalent stiffness represents the mill's load-bearing capacity under unit elastic compression. Dividing the initial target rolling force by the mill's equivalent stiffness yields the equivalent elastic compression caused by the mill's load. This process, based on the linear elastic deformation relationship corresponding to Hooke's law, compensates for the elastic opening changes in the mill stand and roll system under rolling force. The minimum positive number is used to avoid a zero denominator; a preferred value is [value missing]. The unit of the calculation is consistent with the added data in the corresponding denominator. The initial target roll gap value for the setpoint is obtained by adding the roll elastic compression compensation amount to the target thickness setpoint. Since the roll system and stand will undergo elastic deformation under load, the actual exit thickness may deviate from the target thickness if the roll gap is set only according to the target thickness. Therefore, the roll elastic compression compensation amount is superimposed on the target thickness setpoint to form an initial target roll gap value that can compensate for load deformation. The thickness change adjustment status is evaluated, including: calculating the difference between the target thickness setpoint and the previous setpoint to obtain the target thickness change amount. The target thickness change amount is used to characterize the thickness change amplitude between adjacent setpoints. In the equal thickness section, the target thickness setpoints of adjacent setpoints are the same, and the target thickness change amount is zero. In the wedge transition section, the target thickness change amount is used to reflect the degree to which the thickness increases or decreases along the rolling direction. The relative intensity of thickness change is obtained by dividing the absolute value of the target thickness change by the sum of the target thickness setting value and the smallest positive number in the equal-thickness section. This relative intensity is dimensionless and is used to normalize the thickness change amplitude between adjacent setting points to the target thickness scale of the equal-thickness section, facilitating a unified comparison of plates with different thickness specifications. A larger relative intensity indicates a more severe thickness transition near the setting point. The initial target rolling speed is obtained by dividing the reference rolling speed by the relative intensity of thickness change. The reference rolling speed serves as the speed benchmark for stable rolling in the equal-thickness section. When the relative intensity of thickness change is zero, the initial target rolling speed equals the reference rolling speed. As the relative intensity of thickness change increases, the initial target rolling speed decreases accordingly to slow down the dynamic roll gap and load change rate in the wedge transition section, reducing the risk of subsequent plate shape instability.

[0033] In this implementation plan, based on the target thickness, material deformation capacity, and mill structural characteristics, the reduction, contact arc, rolling force, elastic compensation, roll gap, and speed at each set point are uniformly preset, so that the initial control parameters of the equal thickness section and the wedge transition section of the differential thickness plate are more in line with the actual rolling stress and thickness variation law; at the same time, by adjusting the rolling speed through the relative strength of thickness variation, the risk of sudden changes in roll gap and load in the wedge transition section can be reduced, and the rationality, continuity, and feasibility of the preset parameters of the whole plate can be improved.

[0034] Specifically, the process of performing continuity verification on adjacent set points within the wedge transition section is as follows: Within the wedge transition section, adjacent set points are verified for continuity according to their set point numbers. This continuity verification is used to determine whether there are abrupt changes in the preset control parameters between adjacent set points within the wedge transition section, in order to avoid excessive changes in roll gap, rolling force, or rolling speed over a short distance, which could cause dynamic load fluctuations and sheet shape disturbances. For each set point number within the wedge transition section, the initial target roll gap value of the current set point is subtracted from the initial target roll gap value of the previous set point to obtain the target roll gap change. The initial target roll gap value of the current set point is then... The target rolling force change is obtained by subtracting the initial target rolling force of the previous set point from the initial target rolling force; the target rolling speed change is obtained by subtracting the initial target rolling speed of the previous set point from the initial target rolling speed of the current set point; among them, the target roll gap change is used to characterize the change in the amount of reduction between adjacent set points, the target rolling force change is used to characterize the change in the rolling load between adjacent set points, and the target rolling speed change is used to characterize the change in the main drive speed setting between adjacent set points; the three are used together to determine whether the preset parameter changes of the wedge transition section meet the requirements for smooth transition. When the absolute value of the target roll gap change, target rolling force change, or target rolling speed change exceeds the corresponding change threshold, a risk of abrupt parameter changes between adjacent set points is determined. The change thresholds are determined based on the roll gap adjustment capability allowed by the hydraulic pressing control unit, the load change range allowed by the rolling force control unit, and the speed adjustment range allowed by the main drive speed control unit. These thresholds are stored during initialization to limit the allowable changes in roll gap, rolling force, and rolling speed between adjacent set points. A new intermediate set point is inserted at the midpoint between adjacent set points. This new intermediate set point is located at the midpoint of the longitudinal position of the strip corresponding to the current set point and the previous set point. It decomposes the parameter change that was originally completed in one step into two smaller parameter changes, thereby reducing control abrupt changes within the wedge transition section. The target thickness setting value of the new intermediate set point is the average of the target thickness setting values ​​of the two adjacent set points, and the initial target roll gap value, initial target rolling force, and initial target rolling speed corresponding to the new intermediate set point are recalculated. During recalculation, the same calculation rules as the aforementioned initial preset parameter generation process for the entire plate are adopted, so that the new intermediate setpoint has the corresponding target reduction, rolling contact arc length, initial target rolling force, roll elastic compression compensation, initial target roll gap value, and initial target rolling speed. After insertion, the continuity of adjacent setpoints is checked again according to the updated setpoint numbering order until the absolute values ​​of the target roll gap change, target rolling force change, and target rolling speed change between adjacent setpoints are all less than or equal to the corresponding change threshold.

[0035] In this implementation scheme, by continuously verifying the changes in roll gap, rolling force, and rolling speed between adjacent set points of the wedge transition section, and inserting intermediate set points when parameter changes exceed limits, the originally concentrated control changes are decomposed into smoother multi-segment changes. This can reduce dynamic load impacts and speed mutations, improve the continuity and executability of the preset parameters of the wedge transition section, and reduce the risk of plate instability.

[0036] Specifically, the process of generating an initial preset parameter sequence for the entire plate based on the evaluation results and continuity verification results, and then sending it to the rolling mill control module to execute differential thickness plate rolling, is as follows: In the equal thickness section, the target thickness change is zero, and the rolling speed is maintained at the reference rolling speed; the target thickness setting values ​​of adjacent setting points in the equal thickness section are the same, and there is no need to reduce the rolling speed according to the thickness change. The reference rolling speed serves as the stable execution speed for this section. In the wedge transition section, the rolling speed is set to the corresponding initial target rolling speed; wherein, the initial target rolling speed is determined by the relative intensity of the thickness change, and is used to adaptively adjust the speed setting in the wedge transition section according to the target thickness change range. According to the setpoint numbering sequence, the initial target roll gap value, initial target rolling force, and rolling speed corresponding to each setpoint in the equal thickness section and wedge transition section are arranged and associated with the corresponding setpoint number and the longitudinal position of the strip. The setpoint number determines the execution order of the preset parameters, and the longitudinal position of the strip determines the position of the preset parameters along the length of the differential thickness plate. This allows the mill control module to sequentially call the corresponding initial target roll gap value, initial target rolling force, and rolling speed according to the strip's running position. The initial target roll gap value sequence is sent to the hydraulic reduction control unit, the initial target rolling force sequence is sent to the rolling force control unit, and the rolling speed sequence is sent to the main drive speed control unit. These serve as the initial preset parameters for the entire plate when differential thickness plate rolling begins, and differential thickness plate rolling is then executed. Among them, the hydraulic pressing control unit adjusts the roll opening amount according to the initial target roll gap value sequence, the rolling force control unit controls the rolling load according to the initial target rolling force sequence, and the main drive speed control unit controls the linear speed of the strip passing through the mill according to the rolling speed sequence. The three sequences are executed synchronously according to the set point number and the longitudinal position of the strip to ensure that the thickness target, rolling load and speed settings of the whole differential thickness plate maintain a corresponding relationship during the rolling process.

[0037] In this implementation plan, the roll gap, rolling force, and rolling speed of the equal thickness section and the wedge transition section are formed into an initial preset parameter sequence for the whole plate according to the set point number and the longitudinal position of the strip. These parameters are then sent to the corresponding control units so that each control parameter can be executed synchronously with the strip position. This improves the accuracy and coordination of the execution of the preset parameters for rolling differential thickness plates and ensures the correspondence between the thickness target, load control, and speed control.

[0038] Specifically, the process of analyzing the continuity of parameter changes within the setpoint window and evaluating the degree of thickness-shape coupling conflict in the current rolling state, based on rolling feedback data and initial preset parameters of the entire plate, is as follows: The sliding setpoint window is constructed according to the setpoint number sequence and contains only setpoints that have completed rolling and whose exit thickness measurement and transverse tension deviation values ​​have been obtained. The sliding setpoint window contains N completed rolling setpoints, where N is a preset positive integer, preferably between 5 and 20, to ensure the stability of the plate shape trend determination while also considering real-time responsiveness. The window is updated by sliding one setpoint forward each time according to the setpoint number. Based on the transverse tension deviation value of the plate shape corresponding to each completed rolling setting point within the current sliding setting point window, and according to the detection position of each completed rolling setting point in the plate width direction, the transverse tension deviation value of the setting point is divided into an edge detection point set, a middle detection point set, and a quarter-width detection point set. The edge detection point set includes detection points near the two edges of the plate width in the cross-section corresponding to the setting point, preferably located within the plate width direction of 0 to 0.1W and 0.9W to W, where W represents the current thickness difference of the plate. The middle detection point set includes detection points near the center region of the plate width in the cross-section corresponding to the setting point, preferably located within the plate width direction of 0... The detection points are located within the 45W to 0.55W range. The set of detection points for the quarter width includes detection points located near the quarter and three-quarter positions of the plate width in the cross-section corresponding to the set point. Preferably, the detection points are located within the 0.2W to 0.3W and 0.7W to 0.8W ranges in the plate width direction, used to characterize the tension deviation changes in the corresponding quarter wave area. The number of detection points in each set is determined by the number of detection zones of the plate shaper in the plate width direction and is kept consistent within the same rolling batch. When the detection area contains multiple detection points, all detection points in the area are included in the corresponding set to ensure that the edge, middle and quarter width areas all have clear and repeatable sources of detection points. The total lateral plate shape deviation is obtained by summing the edge tension deviation, the middle tension deviation, and the quarter-width tension deviation. Specifically, within the sliding setpoint window, the absolute values ​​of the lateral plate shape deviations of each detection point in the edge detection point set are averaged to obtain the edge tension deviation; the absolute values ​​of the lateral plate shape deviations of each detection point in the middle detection point set are averaged to obtain the middle tension deviation; and the absolute values ​​of the lateral plate shape deviations of each detection point in the quarter-width detection point set are averaged to obtain the quarter-width tension deviation. Finally, the edge tension deviation, the middle tension deviation, and the quarter-width tension deviation are added together to obtain the total lateral plate shape deviation.The absolute tension deviation of the plate shape is obtained by averaging the absolute values ​​of all detection points in the width direction. This average absolute tension deviation serves as a benchmark for tension deviation across the entire plate width within the current sliding setpoint window, avoiding a lack of a unified comparative scale for the total transverse plate shape deviation due to differences in plate width, number of detection points, and overall tension levels. The total transverse plate shape deviation is divided by the sum of the average absolute tension deviation and a minimum positive number, then incremented by one to obtain the plate shape deviation amplification. This amplification characterizes the degree of concentrated deviation of the edge, middle, and quarter-width regions relative to the average tension deviation level across the entire plate width. A larger amplification indicates a more pronounced transverse plate shape deviation within the current sliding setpoint window. For the currently completed rolling setpoint, the target thickness setpoint is subtracted from the corresponding exit thickness measurement to obtain the thickness deviation. The exit thickness measurement is collected by an exit thickness gauge at the longitudinal position of the strip corresponding to the setpoint, and the target thickness setpoint is the target thickness corresponding to the setpoint. The thickness deviation is used to determine whether the currently completed rolling section deviates from the target thickness requirement. The target roll gap change, target rolling force change, and target rolling speed change are calculated. The target roll gap change is the difference between the initial target roll gap value at the current set point and the initial target roll gap value at the previous set point. The target rolling force change is the difference between the initial target rolling force at the current set point and the initial target rolling force at the previous set point. The target rolling speed change is the difference between the initial target rolling speed at the current set point and the initial target rolling speed at the previous set point. These values ​​characterize the continuity of the preset parameters between adjacent set points. The absolute value of the target roll gap change is multiplied by the mill's equivalent stiffness, and a minimum positive number is added to obtain the roll gap load explanation. The roll gap load explanation characterizes the range of load changes that can be explained by the target roll gap change under the mill's equivalent stiffness. The minimum positive number is used to avoid a denominator of zero, and a value of [value missing] is preferred. The absolute value of the target rolling force change is divided by the roll gap load explanation, then one is added, and the natural logarithm is taken to obtain the load mutation amplification. This load mutation amplification characterizes the extent to which the target rolling force change exceeds the load explanation range corresponding to the roll gap change. Taking the natural logarithm helps to reduce the influence of excessive mutations on the judgment results and maintains that the load mutation degree monotonically increases with the target rolling force change. The absolute value of the target rolling speed change is divided by the sum of the initial target rolling speed at the current setpoint and a minimum positive number, then one is added to obtain the speed disturbance amplification. This speed disturbance amplification characterizes the intensity of the speed change at the current setpoint relative to its initial target rolling speed; the larger the target rolling speed change, the larger the speed disturbance amplification. The shape deviation amplification, load mutation amplification, and speed disturbance amplification are multiplied to obtain the comprehensive shape disturbance. This comprehensive shape disturbance comprehensively characterizes the trend of shape deterioration under the combined effects of lateral shape deviation, load mutation, and speed disturbance within the current sliding setpoint window. The thickness deviation is suppressed by dividing the absolute value of the thickness deviation by the sum of the target thickness setting value and the smallest positive number at the corresponding set point, and then adding one. The thickness deviation suppression amount is used to distinguish between "thickness not meeting the standard" and "thickness meeting the standard but plate shape deterioration." As the thickness deviation increases, the thickness deviation suppression amount increases, thereby reducing the subsequent thickness-shape coupling conflict discrimination value and avoiding misjudging a simple case of excessive thickness deviation as a plate shape deterioration conflict under the condition of meeting the thickness standard. The plate shape disturbance comprehensive value is divided by the thickness deviation suppression amount to obtain the thickness-shape conflict median value. A hyperbolic tangent mapping is then performed on the thickness-shape conflict median value to obtain the thickness-shape coupling conflict discrimination value. The hyperbolic tangent mapping is used to compress the thickness-shape conflict median value to a finite range, so that the thickness-shape coupling conflict discrimination value increases with the plate shape disturbance comprehensive value and tends to stabilize when the value is large, facilitating comparison with the conflict discrimination threshold. The thickness-shape coupling conflict discriminant is a dimensionless criterion. It integrates the amplification of shape deviation, the amplification of load mutation, and the amplification of speed disturbance to comprehensively characterize the shape deterioration trend under the combined effects of roll gap changes, rolling force changes, and speed changes. Simultaneously, thickness deviation suppression is used to prevent misjudging simple thickness deviation as a thickness-shape coupling conflict under thickness compliance conditions. Finally, the results are compressed using a hyperbolic tangent mapping to keep the discriminant value stable and bounded, facilitating subsequent unified threshold determination and risk correction control. The thickness-shape coupling conflict discriminant is mainly used to identify the shape deterioration trend caused by the combined effects of roll gap changes, rolling force changes, and speed disturbances under the condition that thickness control meets the target. For cases where the thickness has already significantly exceeded the tolerance, the dominant problem is thickness control anomaly; therefore, the thickness deviation suppression is used to reduce the impact of the corresponding case on the thickness-shape coupling conflict discriminant results.

[0039] The specific formula for the thick coupling conflict discrimination value is as follows:

[0040] ;

[0041] In the formula, Indicates the thick coupling conflict discrimination value; Indicates edge tension deviation; Indicates tension deviation in the middle section; This indicates a one-quarter width tension deviation; Indicates the average absolute tension deviation; This indicates the change in target rolling force; Indicates the target roll gap change; Indicates the equivalent stiffness of the rolling mill; This indicates the change in the target rolling speed; Indicates the initial target rolling speed; Indicates thickness deviation; Indicates the target thickness setting value; This represents a very small positive number, used to avoid the denominator being zero; the preferred value is [value missing]. .

[0042] In this embodiment, Table 1 is a data table of thick coupling conflict discrimination values. Among them, the smallest positive number is... The mill's equivalent stiffness is 4200. The table details the edge tension deviation, middle tension deviation, quarter-width tension deviation, average absolute tension deviation, target rolling force change, target roll gap change, target rolling speed change, initial target rolling speed, thickness deviation, target thickness setting, and thickness-shape coupling conflict discrimination value corresponding to five set points. Specifically, set point 1 corresponds to an edge tension deviation of 18, a middle tension deviation of 12, a quarter-width tension deviation of 10, an average absolute tension deviation of 16.5, a target rolling force change of 12, a target roll gap change of 0.008, a target rolling speed change of 0.04, an initial target rolling speed of 1.60, a thickness deviation of 0.006, a target thickness setting of 1.80, and a thickness-shape coupling conflict discrimination value of 0.7888. Set point 2 corresponds to an edge tension deviation of 24, a middle tension deviation of 17, a quarter-width tension deviation of 18, a target roll gap change of 0.008, a target rolling speed change of 0.04, an initial target rolling speed of 1.60, a thickness deviation of 0.006, a target thickness setting of 1.80, and a thickness-shape coupling conflict discrimination value of 0.7888. The deviation is 15, the average absolute tension deviation is 18.2, the target rolling force change is 18, the target roll gap change is 0.012, the target rolling speed change is 0.05, the initial target rolling speed is 1.55, the thickness deviation is 0.005, the target thickness setting is 1.65, and the thickness-shape coupling conflict discrimination value is 0.8568; the edge tension deviation corresponding to setting point 3 is 31, the middle tension deviation is 22, the quarter-width tension deviation is 19, the average absolute tension deviation is 20.4, the target rolling force change is 26, and the target roll gap change... The target rolling speed variation is 0.016, the initial target rolling speed is 1.48, the thickness deviation is 0.004, the target thickness setting is 1.50, and the thickness-shape coupling conflict discrimination value is 0.9133; the edge tension deviation corresponding to setting point 4 is 37, the middle tension deviation is 28, the quarter-width tension deviation is 24, the average absolute tension deviation is 22.7, the target rolling force variation is 35, the target roll gap variation is 0.021, the target rolling speed variation is 0.09, the initial target rolling speed is 1.39, and the thickness... The deviation is 0.003, the target thickness setting is 1.35, and the thickness-shape coupling conflict discrimination value is 0.9410; the edge tension deviation corresponding to setting point 5 is 44, the middle tension deviation is 35, the quarter-width tension deviation is 31, the average absolute tension deviation is 25.3, the target rolling force change is 44, the target roll gap change is 0.026, the target rolling speed change is 0.11, the initial target rolling speed is 1.28, the thickness deviation is 0.003, the target thickness setting is 1.20, and the thickness-shape coupling conflict discrimination value is 0.9611.

[0043] Table 1. Data Table of Thick Coupling Conflict Discriminant Values

[0044]

[0045] like Figure 3The figure shows a schematic diagram illustrating the evolution trend of the thick-film coupling conflict discrimination value. The horizontal axis is plotted with the setpoint number, and the vertical axis is plotted with the thick-film coupling conflict discrimination value. The diagram uses a broken line to show the changing trend of the degree of thick-film coupling conflict within a wedge-shaped transition section. The dashed line represents the conflict judgment threshold, used to distinguish between normal rolling conditions and rolling conditions with thick-film coupling conflict. (Based on Table 1 and...) Figure 3 It can be seen that as the set point advances, the thickness coupling conflict discrimination value gradually increases from 0.7888 to 0.9611, showing a continuous upward trend. After set point 2, the thickness coupling conflict discrimination value exceeds the conflict judgment threshold, indicating that as the target roll gap change, target rolling force change, and target rolling speed change gradually increase, the degree of plate shape disturbance gradually increases, identifying that there is a significant thickness coupling conflict and plate shape instability risk in the subsequent rolling section.

[0046] In this implementation scheme, by comprehensively analyzing the transverse tension deviation, thickness deviation, and continuity of preset parameter changes in the rolled section through the sliding setpoint window, it is possible to identify the deterioration trend of the plate shape caused by changes in roll gap, rolling force, and speed under the condition that the thickness meets the standard. At the same time, through thickness deviation suppression and hyperbolic tangent mapping, the thickness-shape coupling conflict discrimination results are stable and comparable, which facilitates subsequent risk assessment and correction control of the unrolled setpoint.

[0047] Specifically, the process of predicting the risk of plate shape instability based on the degree of thickness-shape coupling conflict is as follows: The thickness-shape coupling conflict discrimination value is compared with the conflict discrimination threshold. The conflict discrimination threshold is used to distinguish between normal thickness-shape cooperative states and thickness-shape coupling conflict states. It is preferably determined based on the statistical upper limit of the thickness-shape coupling conflict discrimination value in historical qualified thick plate rolling batches, and is kept consistent under the same product specification and the same rolling mill condition. When the thickness-shape coupling conflict discrimination value is less than the conflict discrimination threshold, it is determined that there is no thickness-shape coupling conflict in the currently completed rolling section, and the initial target roll gap value, initial target rolling force, and rolling speed corresponding to the subsequent unrolled setpoint remain unchanged. The subsequent unrolled setpoint is the setpoint where the longitudinal position of the strip has not yet reached the mill roll gap entrance position. Keeping it unchanged indicates that the initial target roll gap value, initial target rolling force, and rolling speed corresponding to the initial preset parameter sequence of the entire plate will continue to be used for rolling control. When the thickness-shape coupling conflict discrimination value is greater than or equal to the conflict discrimination threshold, it is determined that a thickness-shape coupling conflict exists in the currently completed rolling section. A thickness-shape coupling conflict indicates that even with thickness deviation suppressed, the currently completed rolling section still experiences amplified transverse tension deviation, sudden load changes, or enhanced speed disturbances. This suggests that if subsequent sections continue to use the same preset parameters with the same changing trend, there is a risk of inducing shape instability. Based on the longitudinal position of the strip corresponding to the currently completed rolling section, the adjacent unrolled setpoint numbers are determined and marked as shape instability risk setpoints. Specifically, using the longitudinal position of the end strip of the currently completed rolling section as the risk transmission starting point, the adjacent setpoint numbers that have not yet entered the mill roll gap entrance are searched along the rolling direction. The rolling setpoint closest to the risk transmission starting point is determined as the shape instability risk setpoint, ensuring that the preset parameters are corrected and issued before the corresponding setpoint enters the mill.

[0048] In this implementation scheme, by comparing the thickness-shape coupling conflict discrimination value with the threshold, the state of incoordination between thickness and shape control in the rolled section can be identified in a timely manner, and risk marking is only applied to subsequent set points that have not yet entered the rolling mill, avoiding invalid retrospective adjustments to the rolled section; at the same time, the risk transmission range is determined based on the longitudinal position of the strip, reserving control lead time for subsequent preset parameter correction, thereby improving the real-time performance and executability of shape instability prevention.

[0049] Specifically, the process of correcting the preset parameters of subsequent set points in response to the predicted risk of plate shape instability, based on the degree of thickness-shape coupling conflict, is as follows: The conflict threshold is subtracted from the thickness-shape coupling conflict discrimination value to obtain the conflict excess. The conflict excess characterizes the degree to which the current thickness-shape coupling conflict discrimination value exceeds the allowable range. The larger the conflict excess, the higher the risk of plate shape instability when the original preset parameters are continued in the unrolled section. The conflict excess is divided by the sum of the thickness-shape coupling conflict discrimination value and a very small positive number to obtain the correction ratio. The correction ratio limits the smooth correction intensity of subsequent preset parameters, and it increases with the increase of the conflict excess. When the thickness-shape coupling conflict discrimination value equals the conflict threshold, the correction ratio is zero. When the thickness-shape coupling conflict discrimination value is greater than the conflict threshold, the correction ratio is greater than zero and less than one, to avoid excessive one-time correction causing thickness control deviation. For the plate instability risk setpoint, the target roll gap change at the plate instability risk setpoint is multiplied by a correction ratio to obtain the roll gap change correction amount. Here, the target roll gap change amount is the difference between the initial target roll gap value of the plate instability risk setpoint and the initial target roll gap value of the previous setpoint. The roll gap change correction amount is used to reduce the roll gap abrupt change amplitude of the plate instability risk setpoint relative to the previous setpoint. The initial target roll gap value of the plate instability risk setpoint is subtracted from the roll gap change correction amount to obtain the corrected target roll gap value. This correction method makes the corrected target roll gap value closer to the initial target roll gap value of the previous setpoint, thereby reducing the roll gap change gradient between adjacent setpoints and reducing the lateral metal flow disturbance caused by the abrupt change in roll gap within the wedge transition section. Multiply the target rolling force change at the plate instability risk setting point by the correction ratio to obtain the rolling force change correction amount. The target rolling force change amount is the difference between the initial target rolling force at the plate instability risk setting point and the initial target rolling force at the previous setting point. The rolling force change correction amount is used to reduce the load mutation amplitude at the plate instability risk setting point relative to the previous setting point. Subtract the rolling force change correction amount from the initial target rolling force at the plate instability risk setting point to obtain the corrected target rolling force. This correction method makes the corrected target rolling force closer to the initial target rolling force at the previous setting point, thereby reducing the impact of rolling force mutation on the transverse tension distribution of the plate. The target rolling speed change at the plate instability risk setpoint is multiplied by a correction ratio to obtain the speed change correction. The target rolling speed change is the difference between the rolling speed at the plate instability risk setpoint and the rolling speed at the previous setpoint. This speed change correction is used to reduce the magnitude of the speed abrupt change at the plate instability risk setpoint relative to the previous setpoint. The corrected rolling speed is obtained by subtracting the speed change correction from the rolling speed at the plate instability risk setpoint. This correction method brings the corrected rolling speed closer to the rolling speed at the previous setpoint, thereby reducing the disturbance of the main drive speed change to dynamic load and plate stability. The corrected target roll gap value, corrected target rolling force, and corrected rolling speed are applied to subsequent unrolled plate instability risk setpoints.

[0050] In this implementation plan, the correction ratio is determined according to the degree of excessive thickness coupling conflict, and the roll gap, rolling force and speed variation of the subsequent plate shape instability risk setting point are reduced proportionally, so that the corrected preset parameters can smoothly transition to the previous setting point, thereby reducing the load fluctuation and lateral tension disturbance caused by parameter abrupt changes in the wedge transition section and improving the plate shape stability of the subsequent unrolled section.

[0051] Specifically, the process of verifying the corrected parameters based on thickness constraints is as follows: The roll elastic compression compensation is recalculated based on the corrected target rolling force and the mill's equivalent stiffness. This recalculated roll elastic compression compensation reflects the new elastic opening changes in the mill stand and roll system under the corrected target rolling force. Since the aforementioned correction has changed the rolling force level at the plate instability risk setting point, the elastic compensation corresponding to the original initial target roll gap value is no longer fully applicable to the corrected rolling state. Therefore, the elastic compensation needs to be re-determined based on the corrected target rolling force. The target thickness setting value corresponding to the plate instability risk setting point is added to the recalculated roll elastic compression compensation to obtain the thickness constraint roll gap value. The thickness constraint roll gap value represents the roll gap control value required to ensure that the plate instability risk setting point still meets the target thickness setting value under the corrected target rolling force. This is used to prevent the exit thickness from deviating from the target thickness after correction based solely on plate instability risk. The absolute difference between the corrected target roll gap value and the thickness constraint roll gap value is calculated. This absolute difference characterizes the deviation between the corrected target roll gap value and the roll gap value required to meet the target thickness. A larger absolute difference indicates that the corrected target roll gap value is more likely to violate the target thickness control requirements. If the absolute difference is less than or equal to the roll gap allowable deviation threshold, the corrected target roll gap value is retained. This threshold is determined based on the allowable thickness deviation of the differential thickness plate product and the roll gap control accuracy of the hydraulic pressing control unit, limiting the allowable roll gap correction deviation without affecting the target thickness control requirements. Conversely, the thickness constraint roll gap value is used as the final corrected target roll gap value. When the absolute difference is greater than the roll gap allowable deviation threshold, it indicates that the corrected target roll gap value may cause thickness control deviation. In this case, the thickness constraint roll gap value replaces the corrected target roll gap value, making the plate shape correction subject to the target thickness constraint. Based on the final corrected target roll gap value, the corrected target rolling force, and the corrected rolling speed, the preset parameters corresponding to the plate shape instability risk setpoint are updated. Specifically, the final corrected target roll gap value is written into the target roll gap sequence of the corresponding strip instability risk setting point, the corrected target rolling force is written into the target rolling force sequence of the corresponding strip instability risk setting point, and the corrected rolling speed is written into the rolling speed sequence of the corresponding strip instability risk setting point. The parameters are then re-associated according to the setting point number and the longitudinal position of the strip, so that the updated preset parameters are applied to the subsequent unrolled strip instability risk setting points.

[0052] In this implementation scheme, after smoothing correction, thickness constraints are reintroduced. The elastic compensation amount and thickness constraint roll gap value are re-determined by correcting the target rolling force. The correction of the target roll gap is verified to ensure that the target thickness requirement is still met, thus avoiding thickness deviation caused by reducing the risk of plate shape instability. At the same time, only the preset parameters of subsequent unrolled risk setting points are updated to achieve coordinated control of plate shape improvement and thickness compliance.

[0053] Reference Figure 2 As shown, the second aspect of the present invention provides an intelligent preset system for differential thickness plate rolling based on multi-model coupling, applied to the aforementioned intelligent preset method for differential thickness plate rolling based on multi-model coupling, comprising: a rolling data acquisition and processing module, used to acquire process setting data and rolling feedback data, preprocess the process setting data and rolling feedback data, identify equal thickness sections and wedge transition sections, and establish corresponding setting point numbers; and a whole plate initial preset parameter generation module, used to evaluate the rolling mechanical state and thickness change adjustment state of each setting point based on the setting point numbers of equal thickness sections and wedge transition sections, using the corresponding process setting data, and to evaluate the rolling mechanical state and thickness change adjustment state of each setting point within the wedge transition section. The system performs continuity verification on adjacent set points, generates an initial preset parameter sequence for the entire plate based on the evaluation results and continuity verification results, and sends it to the rolling mill control module to execute differential thickness plate rolling; the rolled feedback prediction module is used to analyze the continuity of parameter changes within the set point window by combining rolling feedback data and the initial preset parameters of the entire plate, and evaluate the degree of thickness-shape coupling conflict in the current rolling state; the thickness-shape conflict identification and correction module is used to predict the plate shape instability risk based on the degree of thickness-shape coupling conflict, correct the preset parameters of subsequent set points based on the predicted plate shape instability risk and the degree of thickness-shape coupling conflict, and verify the corrected parameters based on thickness constraints.

[0054] like Figure 4The diagram shows the framework of the intelligent preset workflow for differential thickness plate rolling. First, process setting data is read and rolling feedback data is collected in real time. The data undergoes time and location correlation preprocessing, and the equal thickness section and wedge transition section in the differential thickness plate are identified. Corresponding setpoint numbers are established, and based on these setpoints, the rolling mechanical state and thickness variation adjustment state are evaluated sequentially to determine the initial target roll gap value, initial target rolling force, and initial target rolling speed. Within the wedge transition section, the continuity of the target roll gap change, target rolling force change, and target rolling speed change between adjacent setpoints is further verified. When the change exceeds the corresponding threshold, a new intermediate setpoint is inserted among the adjacent setpoints, and the preset parameters are recalculated to ensure the smoothness and executability of the overall plate preset parameter changes. Finally, the overall plate initial preset parameter sequence is generated and sent to the mill control module to execute the differential thickness plate rolling. During the rolling process, a window of completed rolling sliding setpoints is constructed, and the thickness coupling conflict discrimination value is calculated. If the discrimination value does not exceed the conflict discrimination threshold, the preset parameters of subsequent unrolled setpoints remain unchanged. If the discrimination value exceeds the conflict discrimination threshold, the corresponding plate instability risk setpoint is identified, and the correction ratio is calculated according to the degree of conflict to correct the preset parameters of subsequent unrolled setpoints. After correction, the thickness constraint roll gap value is recalculated based on the thickness constraint, and the corrected target roll gap value is verified. When the corrected target roll gap value meets the roll gap allowable deviation requirements, the corrected target roll gap value is retained; otherwise, the thickness constraint roll gap value is used as the final corrected target roll gap value, and the preset parameters corresponding to the plate instability risk setpoint are updated. Finally, the corrected preset parameters of subsequent unrolled sections are sent to the rolling mill for execution.

[0055] In this implementation plan, four modules are used to complete data acquisition and processing, whole plate preset generation, rolled feedback prediction, and thickness conflict correction in sequence. This ensures that the rolling parameters of differential thickness plates can accurately correspond to the equal thickness section, wedge transition section, and plate and strip position. At the same time, the rolled feedback is used to identify thickness coupling conflicts and to correct the parameters of subsequent unrolled set points under thickness constraints. This improves the execution coordination of the whole plate preset parameters and reduces the risk of thickness compliance but plate shape deterioration.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply 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 process, method, article, or apparatus.

[0057] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. As those skilled in the art will understand, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A smart preset method for differential thickness plate rolling based on multi-model coupling, characterized in that, Includes the following steps: S1, collect process setting data and rolling feedback data, preprocess the process setting data and rolling feedback data, identify the equal thickness section and wedge transition section, and establish corresponding setting point numbers; S2, based on the set point numbers of the equal thickness section and the wedge transition section, evaluates the rolling mechanical state and thickness change adjustment state of each set point using the corresponding process setting data, and performs continuity verification on adjacent set points in the wedge transition section. Based on the evaluation results and continuity verification results, it generates the initial preset parameter sequence of the whole plate and sends it to the rolling mill control module to execute differential thickness plate rolling. S3, combining rolling feedback data and initial preset parameters of the whole plate, analyzes the continuity of parameter changes within the setpoint window and evaluates the degree of thickness-shape coupling conflict in the current rolling state. The specific process of combining rolling feedback data and initial preset parameters of the whole plate to analyze the continuity of parameter changes within the setpoint window and evaluate the degree of thickness-shape coupling conflict in the current rolling state is as follows: Based on the sliding setpoint window where rolling has been completed, the total transverse plate shape deviation is obtained by calculating the sum of the edge tension deviation, the middle tension deviation, and the quarter-width tension deviation according to the transverse tension deviation value of the plate shape. The absolute values ​​of the transverse tension deviation values ​​of all detection points in the plate width direction are averaged to obtain the average absolute tension deviation. The total transverse plate shape deviation is divided by the sum of the average absolute tension deviation and the smallest positive number, and then one is added to obtain the plate shape deviation amplification. For the set point where rolling has been completed, the target thickness set value is subtracted from the exit thickness measurement value corresponding to the set point to obtain the thickness deviation; and the target roll gap change, target rolling force change, and target rolling speed change are calculated. Multiply the absolute value of the target roll gap change by the mill's equivalent stiffness, and add a minimum positive number to obtain the roll gap load explanation; divide the absolute value of the target rolling force change by the roll gap load explanation, add one, and take the natural logarithm to obtain the load mutation amplification; divide the absolute value of the target rolling speed change by the sum of the initial target rolling speed at the current set point and the minimum positive number, and add one to obtain the speed disturbance amplification. Multiply the amplification of plate shape deviation, the amplification of load mutation, and the amplification of velocity disturbance to obtain the comprehensive plate shape disturbance; divide the absolute value of thickness deviation by the sum of the target thickness setting value at the corresponding set point and the smallest positive number, and then add one to obtain the thickness deviation suppression amount. Divide the overall plate-shaped disturbance by the thickness deviation suppression amount to obtain the intermediate value of the thick-shape conflict. Perform hyperbolic tangent mapping on the intermediate value of the thick-shape conflict to obtain the thick-shape coupling conflict discrimination value. S4. Based on the degree of thickness coupling conflict, predict the risk of plate instability. Based on the predicted risk of plate instability, modify the preset parameters of subsequent setting points in combination with the degree of thickness coupling conflict, and verify the modified parameters based on thickness constraints.

2. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 1, characterized in that, The specific process of collecting process setting data and rolling feedback data, preprocessing the process setting data and rolling feedback data, identifying equal thickness sections and wedge transition sections, and establishing corresponding setting point numbers is as follows: Read process setting data, which includes: inlet thickness specification value, target thickness setting value sequence, wedge transition section length, equal thickness section length, plate width, yield strength, roll radius, mill equivalent stiffness, and reference rolling speed; collect rolling feedback data in real time, which includes: plate shape transverse tension deviation value, exit thickness measurement value, strip longitudinal position, and sampling timestamp; Using the sampling timestamp as a time index, the rolling feedback data is time-aligned, and using the longitudinal position of the strip as a position index, the rolling feedback data is associated with the corresponding longitudinal position of the strip. Based on the target thickness setting value sequence, the length of the wedge transition section, and the length of the equal thickness section, the equal thickness section and the wedge transition section along the rolling direction of the differential thickness plate are determined. Within the equal thickness section and the wedge transition section, setting point numbers are established according to the longitudinal position sequence of the strip and at fixed longitudinal distance intervals, and each setting point number is associated with the corresponding target thickness setting value. A differential thickness plate rolling preset database is established to store the original and pre-processed process setting data and rolling feedback data.

3. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 2, characterized in that, The specific process of evaluating the rolling mechanical state and thickness change adjustment state of each set point based on the set point numbering of the equal thickness section and the wedge transition section, using the corresponding process setting data, is as follows: The evaluation of the rolling mechanical state includes: for each set point number in the equal thickness section and the wedge transition section, subtracting the target thickness set value of the corresponding set point from the entrance thickness specification value to obtain the target reduction amount of the set point; multiplying the roll radius by the target reduction amount and taking the square root to obtain the rolling contact arc length of the set point; multiplying the yield strength, plate width, and rolling contact arc length to obtain the initial target rolling force of the set point; dividing the initial target rolling force by the sum of the mill's equivalent stiffness and the smallest positive number to obtain the roll elastic compression compensation amount; and adding the roll elastic compression compensation amount to the target thickness set value corresponding to the set point to obtain the initial target roll gap value of the set point. The assessment of the thickness variation adjustment status includes: calculating the difference between the target thickness setting value between the current setting point and the previous setting point to obtain the target thickness variation amount; dividing the absolute value of the target thickness variation amount by the sum of the target thickness setting value of the equal thickness section and the smallest positive number to obtain the relative intensity of the thickness variation; and dividing the reference rolling speed by the relative intensity of the thickness variation to obtain the initial target rolling speed.

4. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 3, characterized in that, The specific process for performing continuity verification on adjacent set points within the wedge-shaped transition section is as follows: Within the wedge transition section, the continuity of adjacent set points is checked according to the set point numbering order: For each set point number within the wedge transition section, the initial target roll gap value of the current set point is subtracted from the initial target roll gap value of the previous set point to obtain the target roll gap change; the initial target rolling force of the current set point is subtracted from the initial target rolling force of the previous set point to obtain the target rolling force change; the initial target rolling speed of the current set point is subtracted from the initial target rolling speed of the previous set point to obtain the target rolling speed change; when the absolute value of the target roll gap change, target rolling force change, or target rolling speed change is greater than the corresponding change threshold, a new intermediate set point is inserted at the midpoint of the adjacent set points; the target thickness setting value of the new intermediate set point is taken as the average of the target thickness setting values ​​of the two adjacent set points, and the initial target roll gap value, initial target rolling force, and initial target rolling speed corresponding to the new intermediate set point are recalculated.

5. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 3, characterized in that, The specific process of generating the initial preset parameter sequence for the entire plate based on the evaluation results and continuity verification results, and sending it to the rolling mill control module to execute differential thickness plate rolling is as follows: Within the constant thickness section, the target thickness variation is zero, and the rolling speed is maintained at the reference rolling speed. Within the wedge transition section, the rolling speed is set to the corresponding initial target rolling speed. According to the order of the set point numbers, the initial target roll gap value, initial target rolling force, and rolling speed corresponding to each set point in the constant thickness section and the wedge transition section are arranged and associated with the corresponding set point number and the longitudinal position of the strip. The initial target roll gap value sequence is sent to the hydraulic pressing control unit, the initial target rolling force sequence is sent to the rolling force control unit, and the rolling speed sequence is sent to the main drive speed control unit. These serve as the initial preset parameters for the entire plate when the differential thickness plate starts rolling, and the differential thickness plate rolling is executed.

6. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 1, characterized in that, The specific process for predicting plate instability risk based on the degree of thickness coupling conflict is as follows: The thick coupling conflict discrimination value is compared with the conflict discrimination threshold: when the thick coupling conflict discrimination value is less than the conflict discrimination threshold, it is determined that there is no thick coupling conflict in the currently completed rolling section, and the initial target roll gap value, initial target rolling force and rolling speed corresponding to the subsequent unrolled set point remain unchanged; When the thickness coupling conflict discrimination value is greater than or equal to the conflict discrimination threshold, it is determined that there is a thickness coupling conflict in the currently completed rolling section; based on the longitudinal position of the strip corresponding to the currently completed rolling section, the adjacent set point number of the subsequent unrolled section is determined and marked as the strip shape instability risk set point.

7. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 6, characterized in that, The specific process for correcting the preset parameters of subsequent setting points in response to the predicted plate instability risk, combined with the degree of thickness coupling conflict, is as follows: Subtracting the conflict discrimination threshold from the thick coupling conflict discrimination value yields the conflict over-limit amount. Dividing the conflict over-limit amount by the sum of the thick coupling conflict discrimination value and the minimum positive number yields the correction ratio. For the plate shape instability risk setting point, the target roll gap change of the plate shape instability risk setting point is multiplied by the correction ratio to obtain the roll gap change correction amount. The initial target roll gap value of the plate shape instability risk setting point is subtracted from the roll gap change correction amount to obtain the corrected target roll gap value. Multiply the change in target rolling force at the plate instability risk setpoint by the correction ratio to obtain the correction amount for the change in rolling force. Subtract the correction amount for the change in rolling force from the initial target rolling force at the plate instability risk setpoint to obtain the corrected target rolling force. Multiply the change in target rolling speed at the setpoint for plate instability risk by the correction ratio to obtain the speed change correction amount. Subtract the speed change correction amount from the rolling speed at the setpoint for plate instability risk to obtain the corrected rolling speed.

8. The intelligent preset method for differential thickness plate rolling based on multi-model coupling according to claim 7, characterized in that, The specific process for verifying the corrected parameters based on thickness constraints is as follows: The roll elastic compression compensation amount is recalculated based on the modified target rolling force and the mill equivalent stiffness. The target thickness setting value corresponding to the plate instability risk setting point is added to the recalculated roll elastic compression compensation amount to obtain the thickness constraint roll gap value. Calculate the absolute difference between the corrected target roll gap value and the thickness constraint roll gap value. If the absolute difference is less than or equal to the roll gap allowable deviation threshold, retain the corrected target roll gap value; otherwise, use the thickness constraint roll gap value as the final corrected target roll gap value. Based on the final corrected target roll gap value, corrected target rolling force, and corrected rolling speed, update the preset parameters corresponding to the plate shape instability risk setting point.

9. A smart preset system for differential thickness plate rolling based on multi-model coupling, employing the smart preset method for differential thickness plate rolling based on multi-model coupling as described in any one of claims 1-8, characterized in that, include: The rolling data acquisition and processing module is used to collect process setting data and rolling feedback data, preprocess the process setting data and rolling feedback data, identify equal thickness sections and wedge transition sections, and establish corresponding setting point numbers. The whole plate initial preset parameter generation module is used to evaluate the rolling mechanical state and thickness change adjustment state of each set point based on the set point number of the equal thickness section and the wedge transition section, and to perform continuity verification on adjacent set points in the wedge transition section. Based on the evaluation results and continuity verification results, the whole plate initial preset parameter sequence is generated and sent to the rolling mill control module to execute differential thickness plate rolling. The rolled feedback prediction module is used to combine rolling feedback data and the initial preset parameters of the whole plate to analyze the continuity of parameter changes within the set point window and assess the degree of thickness coupling conflict in the current rolling state. The thickness-shape conflict identification and correction module is used to predict the plate shape instability risk based on the degree of thickness-shape coupling conflict. Based on the predicted plate shape instability risk, it corrects the preset parameters of subsequent setting points in combination with the degree of thickness-shape coupling conflict, and verifies the corrected parameters based on thickness constraints.

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