Method and system for automatic thickness control of a plate, and medium

Abstract

This invention provides an automatic thickness control method, system, and medium for medium and heavy plates. The control method includes the following steps: Step S1: Obtain preset slab processing parameters according to the specifications of the slab to be processed; Step S2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing; combined with the preset slab processing parameters, roll gap compensation is performed based on the preset influence relationship between bending roll force and roll gap, the influence relationship between roll shifting position and roll gap, and the automatic thickness control algorithm. This invention considers multiple factors affecting the thickness of the material exiting the mill, effectively preventing thickness deviations caused by over- or under-adjustment of automatic roll gap control, thereby enabling medium and heavy plate production lines to improve yield and produce high-end products.

Description

Technical Field

[0001] This invention relates to the field of electrical automation control technology, specifically to an automatic thickness control method, system, and medium for medium and heavy plates. Background Technology

[0002] Currently, medium and heavy plate manufacturers can roll steel plates with a thickness accuracy of 100-200µm. However, the thickness deviation between individual plates is often significant, especially when there are large changes in bending roll force and roll position. It takes a considerable amount of time to reach a stable range again, resulting in frequent thickness deviations in rolled products, leading to resource waste and increased costs. However, as market demands for the quality of medium and heavy plates increase, the ability to roll products with high-precision thickness will provide companies with a competitive advantage in market share and greater profits. Therefore, developing a technology that can stably control the thickness of the strip steel exiting the rolling mill is essential.

[0003] Chinese patent document CN102294362A discloses a method for controlling the thickness accuracy of medium-thick plates. This method comprehensively considers various influencing factors and constraints, and specifically utilizes various setting, measurement, and calibration methods. Through five control measures—thickness control in the length direction of the steel plate, thickness control in the width direction of the steel plate, absolute thickness control of the steel plate, thickness gauge accuracy control, and secondary rolling target thickness control—the model accuracy is made closer to reality, the program design is more scientific, and the hardware settings and functions are closer to standards, achieving optimal target thickness under constraints and significantly improving the rolling thickness accuracy of steel plates. However, while this document achieves high-precision AGC adjustment through various setting, measurement, and calibration methods, it does not address the root causes of thickness deviation. When the deviation between the set value and the actual value is large, it may be necessary to roll multiple steel plates before reaching a stable state again.

[0004] Chinese patent document CN105436209A discloses a method for controlling the thickness of one side of a medium-thick plate rolling mill, which includes separately adjusting the roll gap values ​​on both sides of the strip in the width direction to control the thickness of the strip at the exit. This method can simultaneously control both the overall thickness of the strip and the thickness of the strip on one side in the width direction, improving both the thickness accuracy of the strip on both sides in the width direction and the overall thickness accuracy of the strip. However, this document does not consider the influence of multiple factors on the thickness of the plate, resulting in low thickness control accuracy. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide an automatic thickness control method, system and medium for medium and thick plates.

[0006] An automatic thickness control method for medium-thick plates provided by the present invention includes the following steps:

[0007] Step S1: Obtain the preset slab processing parameters according to the specifications of the slab to be processed;

[0008] Step S2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing. Combined with preset slab processing parameters, roll gap compensation is performed based on the preset influence relationship between bending roll force and roll gap, the influence relationship between roll shifting position and roll gap, and the automatic thickness control algorithm.

[0009] Preferably, the relationship between the bending roll force and the roll gap is as follows:

[0010] Δs bend =K bend (F bmeas -F bset )

[0011] In the above formula, Δs bend K represents the compensation amount for the roll gap caused by the bending roll force deviation. bend F is the compensation coefficient for the bending roller force deviation; bmeas F is the actual bending force of the roller calculated based on the pressure sensor. bset The bending roll force is set in the slab processing parameters.

[0012] Preferably, the influence of the position of the shifting roller on the roll gap includes: plate shape deviation and thickness deviation;

[0013] The plate shape deviation is compensated for by the influence of bending roll force on roll gap;

[0014] The compensation method for the thickness deviation is as follows:

[0015] Δs shift =K shift (s rmeas -s rset )

[0016] In the above formula: Δs shift K represents the compensation amount for the roll gap caused by the misalignment of the roll position; bend F is the compensation coefficient for the position deviation of the misaligned rollers; bmeas The actual position of the shifting roller is calculated based on the displacement sensor; F bset The position of the shifting rollers is set for the secondary model.

[0017] Preferably, the self-controlled thickness control algorithm includes: compensating for thickness deviations caused by rolling force deviations by dynamically adjusting the roll gap during the rolling process.

[0018]

[0019] In the above formula: Δs agc The roll gap deviation is calculated for automatic thickness control; Δs is the deviation between the model-set roll gap and the actual roll gap; k agc Δh is the automatic thickness control compensation coefficient. gauge The compensated roll gap deviation; c represents the partial derivatives of the stand bounce curve and the total rolling force; g -1 c is the reciprocal of the frame's elastic modulus; m F is the elastic modulus of the rolled piece. r The net rolling force exerted on the workpiece.

[0020] Preferably, the compensated roll gap deviation Δh gauge The calculation methods include:

[0021]

[0022] In the above formula: Δs is the deviation between the model-set roll gap and the actual roll gap; ΔF r The model is set with the deviation between the rolling force and the actual rolling force; zpc is the zero-point correction compensation amount; ΔF b Set the deviation value between the bending force and the actual bending force for each bearing housing model.

[0023] Preferably, the method for calculating the zero-point correction compensation amount zpc includes:

[0024] The integral formula for calculating the thickness deviation of steel plates is as follows:

[0025]

[0026] In the above formula: I gauge The integral quantity for calculating the thickness deviation of the steel plate; t loaded The moment when the rolling mill bites the steel; t meas Δh is the time when the thickness gauge measurement ends. gauge ZPC represents the compensated roll gap deviation; ZPC represents the zero-point correction compensation amount.

[0027] The integral formula for measuring the thickness deviation of steel plates using a thickness gauge is as follows:

[0028]

[0029] In the above formula: I gauge h is the integral quantity used by the thickness gauge to measure the thickness deviation of steel plates. meas The thickness of the steel plate measured by a thickness gauge; h calc The steel plate thickness calculated for the model;

[0030] The deviation between the steel plate thickness and the thickness measured by the thickness gauge is calculated using the following formula:

[0031]

[0032] The calculated deviation is applied to the zero-point correction:

[0033] zpc = zpc old +k zpc ·Δh zp

[0034] In the above formula: Δh zp To calculate the steel plate thickness and the deviation between the steel plate thickness measured by the thickness gauge; k zpc To calculate the deviation compensation coefficient between the steel plate thickness and the thickness measurement by the thickness gauge, zpc old zpc is the zero-point correction value calculated in the previous calculation, and zpc is the zero-point correction value calculated in the current calculation.

[0035] An automatic thickness control system for medium-thick plates according to the present invention includes the following modules:

[0036] Module M1: Obtains the preset slab processing parameters according to the specifications of the slab to be processed;

[0037] Module M2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing. Roll gap compensation is performed based on preset relationships between bending roll force and roll gap, roll shifting position and roll gap, and automatic thickness control algorithm.

[0038] Preferably, the relationship between the bending roll force and the roll gap is as follows:

[0039] Δs bend =K bend (F bmeas -F bset )

[0040] In the above formula, Δs bend K represents the compensation amount for the roll gap caused by the bending roll force deviation. bend F is the compensation coefficient for the bending roller force deviation; bmeas F is the actual bending force of the roller calculated based on the pressure sensor. bset The bending roll force set in the slab processing parameters;

[0041] The influence of the roll shifting position on the roll gap includes: plate shape deviation and thickness deviation; the plate shape deviation is compensated for by the influence of the bending roll force on the roll gap; the compensation method for the thickness deviation is as follows:

[0042] Δs shift =K shift (s rmeas -s rset )

[0043] In the above formula: Δsshift K represents the compensation amount for the roll gap caused by the misalignment of the roll position; bend F is the compensation coefficient for the position deviation of the misaligned rollers; bmeas The actual position of the shifting roller is calculated based on the displacement sensor; F bset The position of the shifting rollers is set for the secondary model.

[0044] Preferably, the self-controlled thickness control algorithm includes: compensating for thickness deviations caused by rolling force deviations by dynamically adjusting the roll gap during the rolling process.

[0045]

[0046] In the above formula: Δs agc The roll gap deviation is calculated for automatic thickness control; Δs is the deviation between the model-set roll gap and the actual roll gap; k agc Δh is the automatic thickness control compensation coefficient. gauge The compensated roll gap deviation; c represents the partial derivatives of the stand bounce curve and the total rolling force; g -1 c is the reciprocal of the frame's elastic modulus; m F is the elastic modulus of the rolled piece. r The net rolling force exerted on the workpiece.

[0047] According to the present invention, a computer-readable storage medium storing a computer program is provided, wherein when the computer program is executed by a processor, the steps of the automatic thickness control method for medium-thick plates are implemented.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. This invention develops and optimizes a high-precision thickness control technology, taking into account multiple factors affecting the thickness of the material exiting the rolling mill, effectively preventing thickness deviations caused by over- or under-adjustment of automatic roll gap control, thereby enabling medium and heavy plate production lines to improve yield and produce high-end products.

[0050] 2. This invention provides a highly adaptable thickness control technology. By calculating the compensation amount of roll gap caused by the deviation of the roll position and the deviation of the roll bending force, the closed-loop control of the rolling force AGC and zero-point position compensation function achieves the effect of stabilizing thickness accuracy.

[0051] 3. Given the inherent limitations of thick plate production lines, resulting in low finished product thickness accuracy and severe thickness deviations in some products, this technology can improve product thickness accuracy, meet market demands, and enhance the profitability of medium and heavy plate enterprises. Attached Figure Description

[0052] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0053] Figure 1 This is a schematic diagram of the automatic thickness control method for medium and heavy plates. Detailed Implementation

[0054] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0055] Example 1

[0056] This invention discloses an automatic thickness control method for medium and heavy plates. It addresses the problems of difficulty in controlling the thickness accuracy of rolled products and over- or under-adjustment of thickness in medium and heavy plate enterprises. By developing and optimizing a multi-factor thickness control technology, the method achieves stable and controllable thickness of steel plates during continuous rolling, thereby enabling medium and heavy plate production lines to improve yield and produce high-end products.

[0057] This invention provides a multi-factor thickness control technology solution, the specific solution including:

[0058] Stable thickness control is achieved through the integrated automatic gauge control system of the rolling mill, which includes rolling force AGC (Automatic Gauge Control), the influence of roll bending force on the roll gap, the influence of roll shifting position on the roll gap, and the zero-point compensation function of the roll gap. During the rolling process, the rolling mill sets the slab processing parameters according to the secondary model corresponding to different thickness specifications, including speed, roll gap, and exit thickness data. During the steel biting process of the rolling mill, the influence of roll bending force and roll shifting position on the roll gap is calculated in real time. The deviation of the roll gap zero point position is also taken into account. Combined with the thickness deviation calculation value, the rolling force AGC is activated in time to quickly compensate for the change in stand tension according to the change in rolling force, so as to ensure the thickness accuracy of the finished product.

[0059] 1. The effect of bending roll force on roll gap

[0060] The bending roll force model calculates the final set value of the bending roll force based on the pre-calculated set bending roll force, the additional bending roll force calculated by the dynamic crowning model and the skewed roll model. If the actual bending roll force is not equal to the set value given by L2, the resulting frame tension must be compensated.

[0061] The specific formula is as follows:

[0062] Δs bend =K bend (Fbmeas -F bset )

[0063] In the above formula:

[0064] Δs bend This is the amount of compensation for the roll gap caused by the deviation of the bending roll force;

[0065] K bend This is the compensation coefficient for the bending roller force deviation;

[0066] F bmeas The actual bending force of the roller is calculated based on the pressure sensor.

[0067] F bset The bending force is set for the secondary model.

[0068] 2. The influence of roll position on roll gap

[0069] Roll shifting typically operates according to the set position issued by the secondary model. However, sometimes deviations between the actual and set positions can cause deviations in the steel plate's shape and thickness. Deviations in plate shape are compensated for by calculating additional bending force using the bending roll model. Deviations in thickness are compensated for by calculating additional roll gap using the roll shifting model.

[0070] The specific formula is as follows:

[0071] Δs shift =K shift (s rmeas -s rset )

[0072] In the above formula:

[0073] Δs shift This is the compensation amount for the roll gap caused by the deviation in the position of the shifting roll;

[0074] K bend This is the compensation coefficient for the position deviation of the misaligned roller;

[0075] F bmeas The actual position of the shifting roller is calculated based on the displacement sensor;

[0076] F bset The position of the shifting rollers is set for the secondary model;

[0077] 3. Automatic thickness control

[0078] The main function of automatic thickness control is to compensate for thickness deviations caused by rolling force variations by dynamically adjusting the roll gap during the rolling process. The calculations for this part primarily rely on the rolling force deviation, the effective elastic modulus of the mill stand, and the elastic modulus of the rolled piece.

[0079]

[0080] In the above formula:

[0081] Δs agc The roll gap deviation calculated for automatic thickness control;

[0082] Δs is the deviation between the model-defined roll gap and the actual roll gap;

[0083] k agc This is the automatic thickness control compensation coefficient;

[0084] The partial derivatives of the stand bounce curve and the total rolling force;

[0085] c g -1 It is the reciprocal of the frame's elastic modulus;

[0086] c m The elastic modulus of the rolled product;

[0087] F r The net rolling force exerted on the workpiece.

[0088] 4. Calculate thickness deviation

[0089] The calculated thickness deviation refers to the steel plate thickness deviation calculated after considering factors such as roll gap position deviation, rolling force deviation, bending roll force deviation, and roll shifting position deviation. However, when the rolling force is relatively small, the mill stretching curve is non-linear, so it is necessary to introduce the second derivative. This controller calculates in real time during the steel plate rolling process, and the specific formula is as follows:

[0090]

[0091] In the above formula:

[0092] Δh gauge The compensated roll gap deviation;

[0093] Δs is the deviation between the model-defined roll gap and the actual roll gap;

[0094] c g -1 It is the reciprocal of the frame's elastic modulus;

[0095] ΔF r Set the deviation value between the rolling force and the actual rolling force for the model;

[0096] zpc is the zero-point correction compensation amount;

[0097] The partial derivatives of the stand bounce curve and the total rolling force;

[0098] ΔFb Set the deviation value between the bending roll force and the actual bending roll force for each bearing housing model;

[0099] 5. Zero point position correction

[0100] Zero-point position correction calculates an additional roll gap compensation value based on the thickness deviation measured by the thickness gauge at the mill exit. This zero-point position correction is used to eliminate the deviation between the calculated steel plate thickness and the thickness measured by the thickness gauge. It should be noted that if AGC is not in use, the deviation between these two values ​​will be the stretching amount of the stand.

[0101] Once the rolling mill bites the steel, the deviation between the steel plate thickness and the thickness measured by the thickness gauge is integrated and calculated.

[0102] The integral formula for calculating the thickness deviation of steel plates is as follows:

[0103]

[0104] In the above formula:

[0105] I gauge To calculate the integral of the steel plate thickness deviation;

[0106] t loaded The moment when the rolling mill bites the steel;

[0107] t meas This is the time when the thickness gauge measurement ends;

[0108] Δh gauge The compensated roll gap deviation;

[0109] zpc is the zero-point correction compensation amount;

[0110] The integral formula for measuring the thickness deviation of steel plates using a thickness gauge is as follows:

[0111]

[0112] In the above formula:

[0113] I gauge The integral quantity for measuring the thickness deviation of steel plates using a thickness gauge;

[0114] h meas The thickness of the steel plate as measured by a thickness gauge;

[0115] h calc The steel plate thickness calculated for the model;

[0116] Then, the deviation between the steel plate thickness and the thickness measured by the thickness gauge can be calculated using the following formula:

[0117]

[0118] The calculated deviation is applied to the zero-point correction:

[0119] zpc = zpc old +k zpc ·Δh zp

[0120] In the above formula: Δh zp To calculate the thickness of the steel plate and the deviation between the thickness of the steel plate measured by the thickness gauge;

[0121] k zpc To calculate the deviation compensation coefficient between the steel plate thickness and the thickness measurement of the steel plate by the thickness gauge;

[0122] zpc old This is the zero-point correction value calculated in the previous operation;

[0123] zpc is the zero-point correction value for this calculation.

[0124] Example 2

[0125] The invention will be further described in detail below with reference to a specific case.

[0126] For a steel plate with a normal rolling exit thickness of 12mm, taking a finishing mill as an example, the additional value of the roll gap is ΔS. agc 1. The secondary model uses the material plastic deformation coefficient C of the frame. m and the reciprocal of the frame elasticity coefficient The data is sent to the automated control system, where the rack flexibility coefficient is... It is a nonlinear function of rolling force and rolling mill deformation calculated based on mill stiffness testing, with the material plastic deformation coefficient C. m It is calculated based on the chemical composition of different materials. In this example, the frame elasticity coefficient... Material plasticity coefficient C m = 2.2MN / mm;

[0127] 2. The secondary model, based on previous rolling conditions, iteratively calculates the zero-point roll gap compensation amount zpc and sends it to the automated control system. In this example, the zero-point roll gap compensation amount zpc = 220µm, and the partial derivatives of the stand bounce curve and the total rolling force are...

[0128] 3. Set the gain coefficient K of the rolling force AGC in the automated control system. agc =0.95, the compensation coefficient K for bending roller force deviation bend =1.1e -10 The compensation coefficient K for the position deviation of the skewed roller shift =6e -3 ;

[0129] 4. When the steel plate receives the settings from the model at the entrance of the finishing mill, the automation system receives the zero-point roll gap compensation amount zpc = 220um. The additional roll gap value at this time is ΔS. agc = -220um, the mill roll gap is closed at 220um to await strip entry. When the steel plate head enters the mill, and the actual rolling force measured by the rolling force detection device reaches 70% of the rolling force set in the secondary model, the deviation of the bending roll force, the deviation of the shifting roll position, and the deviation between the model-set roll gap and the actual roll gap are calculated according to the internal logic. Assuming the bending roll force deviation is 0.5MN, the shifting roll position deviation is 4mm, and the deviation between the model-set roll gap and the actual roll gap is 19um, according to the formula:

[0130] Δs bend =K bend (F bmeas -F bset ) = 1.1 * 10 -10 *0.5*10 6 =55um

[0131] Δs shift =K shift (s rmeas -s rset ) = 6 * 10 -3 *4*10 -3 =24um

[0132] Δs agc =Δs-Δs bend -Δs shift -zpc=19-55-24-220=-280um

[0133] The additional value of the roll gap at this time is ΔS agc = -280um. The change of this set value completes the additional roll gap action through the position ramp of the position controller set in the automatic control system.

[0134] 5. After the steel bites, the rolling force AGC calculates the theoretical thickness deviation based on the deviation between the set rolling force and the actual rolling force. Assume the deviation between the set rolling force and the actual rolling force is ΔF. r =5MN, actual rolling force F r =30MN, calculated using the following formula:

[0135]

[0136] Then substitute the calculation result into the AGC calculation formula:

[0137]

[0138] This calculated value is then added to the mill's roll gap setting, i.e., ΔS at this point. agc = -1460um. This process will be calculated in real time based on the actual rolling force changes and the actual rolling force changes in the subsequent rolling process, and will be continuously iterated until a stable state is reached.

[0139] The present invention also provides an automatic thickness control system for medium and heavy plates. The automatic thickness control system for medium and heavy plates can be implemented by executing the process steps of the automatic thickness control method for medium and heavy plates. That is, those skilled in the art can understand the automatic thickness control method for medium and heavy plates as a preferred embodiment of the automatic thickness control system for medium and heavy plates.

[0140] Specifically, the present invention provides an automatic thickness control system for medium-thick plates, comprising the following modules:

[0141] Module M1: Obtains the preset slab processing parameters according to the specifications of the slab to be processed;

[0142] Module M2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing. Roll gap compensation is performed based on preset relationships between bending roll force and roll gap, roll shifting position and roll gap, and automatic thickness control algorithm.

[0143] The relationship between the bending force and the roll gap is as follows:

[0144] Δs bend =K bend (F bmeas -F bset )

[0145] In the above formula, Δs bend K represents the compensation amount for the roll gap caused by the bending roll force deviation. bend F is the compensation coefficient for the bending roller force deviation; bmeas F is the actual bending force of the roller calculated based on the pressure sensor. bset The bending roll force set in the slab processing parameters;

[0146] The influence of roll shifting position on roll gap includes: plate shape deviation and thickness deviation; plate shape deviation is compensated for by the influence of roll bending force on roll gap; the compensation method for thickness deviation is as follows:

[0147] Δs shift =K shift (s rmeas -s rset )

[0148] In the above formula: Δs shift K represents the compensation amount for the roll gap caused by the misalignment of the roll position; bend F is the compensation coefficient for the position deviation of the misaligned rollers; bmeasThe actual position of the shifting roller is calculated based on the displacement sensor; F bset The position of the shifting rollers is set for the secondary model.

[0149] The self-controlled thickness control algorithm includes: compensating for thickness deviations caused by rolling force deviations by dynamically adjusting the roll gap during the rolling process.

[0150]

[0151] In the above formula: Δs agc The roll gap deviation is calculated for automatic thickness control; Δs is the deviation between the model-set roll gap and the actual roll gap; k agc Δh is the automatic thickness control compensation coefficient. gauge The compensated roll gap deviation; c represents the partial derivatives of the stand bounce curve and the total rolling force; g -1 c is the reciprocal of the frame's elastic modulus; m F is the elastic modulus of the rolled piece. r The net rolling force exerted on the workpiece.

[0152] The present invention also provides a computer-readable storage medium storing a computer program, such as a CD or a disk, wherein the computer program, when executed by a processor, implements the steps of an automatic thickness control method for medium-thick plates.

[0153] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0154] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An automatic thickness control method for medium-thick plates, characterized in that, Includes the following steps: Step S1: Obtain the preset slab processing parameters according to the specifications of the slab to be processed; Step S2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing. Combined with preset slab processing parameters, roll gap compensation is performed based on the preset influence relationship of bending roll force on roll gap, the influence relationship of roll shifting position on roll gap, and automatic thickness control algorithm. The relationship between the bending force and the roll gap is as follows: In the above formula, This is the compensation amount for the roll gap caused by the deviation of the bending roll force; This is the compensation coefficient for the bending roller force deviation; The actual bending force of the roller is calculated based on the pressure sensor. The bending roll force set in the slab processing parameters; The influence of the position of the shifting roller on the roller gap includes: plate shape deviation and thickness deviation; The plate shape deviation is compensated for by the influence of bending roll force on roll gap; The compensation method for the thickness deviation is as follows: In the above formula: This is the compensation amount for the roll gap caused by the deviation in the position of the shifting roll; This is the compensation coefficient for the positional deviation of the roller; The actual position of the shifting roller is calculated based on the displacement sensor; The position of the shifting rollers is set for the secondary model; The automatic thickness control algorithm includes: dynamically adjusting the roll gap during the rolling process to compensate for thickness deviations caused by rolling force deviations. In the above formula: The roll gap deviation calculated for automatic thickness control; Set the deviation value between the roll gap and the actual roll gap for the model; This is the automatic thickness control compensation coefficient; The compensated roll gap deviation; For the stand bounce curve and the total rolling force, the partial derivatives are given. It is the reciprocal of the frame's elastic modulus; The elastic modulus of the rolled product; The net rolling force exerted on the workpiece; This is the zero-point correction compensation amount.

2. The automatic thickness control method for medium-thick plates according to claim 1, characterized in that, The compensated roll gap deviation The calculation methods include: In the above formula: Set the deviation value between the roll gap and the actual roll gap for the model; Set the deviation value between the rolling force and the actual rolling force for the model; This is the zero-point correction compensation amount; Set the deviation value between the bending force and the actual bending force for each bearing housing model.

3. The automatic thickness control method for medium-thick plates according to claim 2, characterized in that, The zero-point correction compensation amount The calculation methods include; The integral formula for calculating the thickness deviation of steel plates is as follows: In the above formula: To calculate the integral of the steel plate thickness deviation; The moment when the rolling mill bites the steel; This is the time when the thickness gauge measurement ends; The compensated roll gap deviation; This is the zero-point correction compensation amount; The integral formula for measuring the thickness deviation of steel plates using a thickness gauge is as follows: In the above formula: The integral quantity for measuring the thickness deviation of steel plates using a thickness gauge; The thickness of the steel plate as measured by a thickness gauge; The steel plate thickness calculated for the model; The deviation between the steel plate thickness and the thickness measured by the thickness gauge is calculated using the following formula: The calculated deviation is applied to the zero-point correction: In the above formula: To calculate the thickness of the steel plate and the deviation between the thickness of the steel plate measured by the thickness gauge; To calculate the deviation compensation coefficient between the steel plate thickness and the thickness measurement of the steel plate by the thickness gauge, This is the zero-point correction value calculated last time. This is the zero-point correction value for this calculation.

4. An automatic thickness control system for medium-thick plates, characterized in that, Includes the following modules: Module M1: Obtains the preset slab processing parameters according to the specifications of the slab to be processed; Module M2: Real-time acquisition of bending roll force, roll shifting position, and actual roll gap during slab processing; roll gap compensation is performed based on preset relationships of bending roll force and roll shifting position on roll gap, as well as automatic thickness control algorithm. The relationship between the bending force and the roll gap is as follows: In the above formula, This is the compensation amount for the roll gap caused by the deviation of the bending roll force; This is the compensation coefficient for the bending roller force deviation; The actual bending force of the roller is calculated based on the pressure sensor. The bending roll force set in the slab processing parameters; The influence of the roll shifting position on the roll gap includes: plate shape deviation and thickness deviation; the plate shape deviation is compensated for by the influence of the bending roll force on the roll gap; the compensation method for the thickness deviation is as follows: In the above formula: This is the compensation amount for the roll gap caused by the deviation in the position of the shifting roll; This is the compensation coefficient for the positional deviation of the roller; The actual position of the shifting roller is calculated based on the displacement sensor; The position of the shifting rollers is set for the secondary model; The automatic thickness control algorithm includes: dynamically adjusting the roll gap during the rolling process to compensate for thickness deviations caused by rolling force deviations. In the above formula: The roll gap deviation calculated for automatic thickness control; Set the deviation value between the roll gap and the actual roll gap for the model; This is the automatic thickness control compensation coefficient; The compensated roll gap deviation; For the stand bounce curve and the total rolling force, the partial derivatives are given. It is the reciprocal of the frame's elastic modulus; The elastic modulus of the rolled product; The net rolling force exerted on the workpiece.

5. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the automatic thickness control method for medium-thick plates according to any one of claims 1 to 3.

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