Method for correcting detection pressure of finish rolling AGC pressure sensor in hot continuous rolling

Abstract

The invention provides a method for correcting the detection pressure of a finish rolling AGC pressure sensor in hot continuous rolling, and relates to the technical field of metallurgical automatic control. According to the method, after the AGC function of the finishing mill is started, AGC roll gap given data and pressure sensor detection data are determined; the AGC controller execution cycle time is determined, and the roll gap given data change trend is judged; according to the calculated pressure fluctuation quantity, correcting pressure sensor detection data to obtain corrected pressure sensor detection data; after the AGC function of the finishing mill group is started, delaying for a certain time, and switching AGC roll gap given data calculation into corrected pressure sensor detection data according to the pressure sensor detection data; and after the AGC function of the finishing mill group is cancelled, the calculation basis of the given data of the AGC roll gap is switched to the detection data of the pressure sensor. The method is beneficial for reducing AGC roll gap adjustment fluctuation caused by pressure sensor data fluctuation, and has positive significance for stabilizing the rolling stability of the finishing mill.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical automation control, and in particular to a method for correcting the pressure detection of a finishing rolling AGC pressure sensor in hot rolling. Background Art

[0002] In the field of metal rolling, the finishing AGC pressure sensor plays the role of detecting the pressure in the AGC cylinders on both sides of the finishing mill. The force of the AGC cylinder on the rolling mill and the strip is calculated through the side area of ​​the AGC cylinder piston and the side area of ​​the rod. The thickness of the strip at the mill outlet is calculated based on the pressure, roll gap, etc., thus realizing the thickness control of the finishing strip outlet.

[0003] At present, there is no existing technology for the pressure calculation and correction of the AGC pressure sensor for hot rolling finishing. However, there are several technologies regarding the installation structure of the rolling force pressure sensor of the rolling mill: 1. (Announcement number: CN218118193U, the name is: A pressure sensor valve block on the cylinder body of the AGC hydraulic cylinder of a rolling mill), the patent application proposes a pressure sensor valve block on the cylinder body of the AGC hydraulic cylinder of a rolling mill, including an upper hydraulic cylinder mechanism, an installation mechanism and a lower hydraulic cylinder mechanism. 2. (Announcement number: CN108838217B, the name is: An installation structure for a rolling force pressure sensor of a pickling mill), the patent application proposes an installation structure for a rolling force pressure sensor of a pickling mill, which effectively prevents the influence of the harsh environment in the rolling mill on the pressure sensor, greatly improves the service life of the pressure sensor, and the pressure sensor has good reliability, and the automatic control system of the cold pickling mill is stable.

[0004] However, due to various reasons such as the installation position of the pressure sensor and the mechanism of detecting the pressure in the valve station, when the servo valve of the AGC cylinder actuator frequently adjusts the oil in and out of the cylinder cavity, it will have a certain pressure fluctuation effect on the detected pressure in the cylinder. In summary, there is currently a lack of a correction method for the detection pressure of the AGC cylinder pressure sensor of the hot rolling finishing mill in the field of metal rolling. The pressure sensor detection pressure value can be effectively corrected through automation means combined with the servo valve to control the action principle of the AGC cylinder to control the stability of the strip during the rolling process.

[0005] Therefore, we propose a method for correcting the pressure detection of the finishing rolling AGC pressure sensor in hot rolling.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0007] The object of the present invention is to provide a method for correcting the pressure detected by the finishing rolling AGC pressure sensor in hot rolling, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a method for correcting the pressure detected by the AGC pressure sensor of the finishing rolling in hot rolling, comprising: Step 1: Start the AGC function of the finishing mill and clarify the AGC roll gap given data , AGC pressure sensor detection data ; Step 2: Determine the AGC controller execution cycle time , with the AGC controller executing the cycle time The time interval is to obtain the AGC roll gap given data in sequence The values ​​of the two cycles before and after are used to determine the AGC roll gap given data. The changing trend of the two cycles before and after; Step 3: According to the AGC roll gap given data The change trend of the two cycles before and after is used to construct the pressure fluctuation formula, and the pressure fluctuation caused by the change of the given data of the AGC roll gap before and after is calculated. ; Step 4: The pressure fluctuation caused by the change of the AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test, the corrected pressure sensor detection data is obtained. ; Step 5: After the finishing mill starts the AGC function, delay for a certain period of time , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data ; Step 6: After the AGC function of the finishing mill is canceled, the AGC roll gap given data is calculated based on the corrected pressure sensor detection data Switch to pressure sensor detection data .

[0009] Furthermore, the finishing mill starts the AGC function and clarifies the AGC roll gap given data. , AGC pressure sensor detection data Taking the 8th stand of the finishing mill as an example, after each stand bites the steel and the AGC is started, the roll gap setting and pressure sensor detection data of each stand can be clearly determined.

[0010] Furthermore, the AGC controller execution cycle time is determined ,by is the time interval, in indivual The AGC roll gap given data recorded at this time point is: , in indivual The AGC roll gap given data recorded at this time point is: , construct a formula to determine the given data of AGC roll gap The changing trend of the two cycles before and after is as follows: In the formula, Indicated as AGC roll gap given data The changing trends of the two cycles before and after, Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data in the previous cycle, in mm. Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data for the next cycle, in mm, where: for A positive integer.

[0011] Furthermore, the AGC controller execution cycle time is determined ,in It indicates the cycle period of the real-time pressure detection of the finishing rolling AGC pressure sensor in the controller. The value is given by experience, with a range of [1-16] and the unit is ms.

[0012] Furthermore, first, a formula is constructed to calculate the hardness deviation ratio of the current steel material relative to the standard material: In the formula, It is expressed as the hardness deviation ratio of the current steel material relative to the standard material. Indicates the current steel hardness measured by the hardness testing equipment, Expressed as standard material hardness of the same type of steel; Based on the hardness deviation ratio of the current steel material relative to the standard material, the steel material coefficient is constructed: In the formula, Expressed as steel material coefficient; Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material: The temperature coefficient is calculated based on the temperature deviation ratio of the current steel material relative to the standard material: In the formula, Expressed as temperature coefficient; The pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data before and after is constructed based on the steel material coefficient and temperature coefficient: In the formula, It is expressed as the pressure fluctuation gain coefficient caused by the change of the given data of the AGC roll gap before and after; Finally, according to the AGC roll gap given data The changing trend of the two periods before and after is used to construct the pressure fluctuation formula: in, It is expressed as the pressure fluctuation caused by the change of the given data of the AGC roll gap, in bar; It is expressed as the conversion coefficient between the given data of AGC roll gap and the pressure unit detected by AGC pressure sensor; It is expressed as the pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data.

[0013] Furthermore, the AGC roll gap given data and the AGC pressure sensor detected pressure unit conversion coefficient , this value is given by experience and the range is [50-150]; the pressure fluctuation gain coefficient caused by the change of AGC roll gap given data before and after , the value range is [0.1-1].

[0014] Furthermore, the pressure fluctuation caused by the change of the AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test data of pressure sensor after correction The calculation formula is: In the formula, Represents the corrected pressure sensor detection data, It indicates the pressure fluctuation caused by the change of AGC roll gap given data before and after, in bar; Represents the AGC pressure sensor detection data in bar.

[0015] Furthermore, after the finishing mill starts the AGC function, it delays for a certain period of time. , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data .

[0016] Furthermore, the finishing mill starts the AGC function after a certain delay. , this value is given by experience, the value range is [100-500], and the unit is ms.

[0017] Furthermore, after the AGC function of the finishing mill is cancelled, the AGC roll gap given data is calculated based on the corrected pressure sensor detection data. Switch to pressure sensor detection data .

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention determines the execution cycle time of the AGC controller After that, judge the AGC roll gap given data The change trend of the two cycles before and after is calculated, and the pressure fluctuation is used to correct the pressure sensor detection data, providing accurate data basis for AGC roll gap adjustment, making the roll gap adjustment more stable. The control method is simple and easy. After the step of correcting the pressure sensor detection data is completed, a certain time delay is performed. Finally, the calculation basis of the AGC roll gap given data is switched from the pressure sensor detection data to the corrected pressure sensor detection data, which is beneficial to reducing the AGC roll gap adjustment fluctuation problem caused by the pressure sensor data fluctuation, and has positive significance for stabilizing the rolling stability of the finishing mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall method flow of the present invention. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example: See also Figure 1 , the present invention provides a technical solution: A method for correcting the pressure detection of a finishing rolling AGC pressure sensor in hot rolling, the specific steps comprising: Step 1: Start the AGC function of the finishing mill and clarify the AGC roll gap given data , AGC pressure sensor detection data ; When the AGC function is started in the finishing mill, the system can obtain the AGC roll gap given data of each stand after the steel biting is completed. And AGC pressure sensor detection data , where AGC roll gap given data It is the expected roll gap size in the finishing process, which determines the final rolling thickness of the rolled piece. The AGC pressure sensor detects the data It is used to calculate the strip thickness at the rolling mill exit and is a key parameter for controlling the rolling process.

[0023] Step 2: Determine the AGC controller execution cycle time , with the AGC controller executing the cycle time The time interval is to obtain the AGC roll gap given data in sequence The values ​​of the two cycles before and after are used to determine the AGC roll gap given data. The changing trend of the two cycles before and after; Determine the AGC controller execution cycle time , in each During the time interval, the system will record the AGC roll gap given data , in indivual The AGC roll gap given data recorded at this time point is: , in indivual The AGC roll gap given data recorded at this time point is: , construct a formula to determine the given data of AGC roll gap The changing trend of the two cycles before and after is as follows: In the formula, Indicated as AGC roll gap given data The changing trends of the two cycles before and after, Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data in the previous cycle, in mm. Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data for the next cycle, in mm, where: for A positive integer, where It represents the cycle period of the real-time detection pressure of the finishing rolling AGC pressure sensor in the controller. The value is given by experience, the value range is [1,16], and the unit is ms. By calculating the change trend of the given roll gap data, the subsequent pressure fluctuation correction is realized, and the AGC roll gap adjustment fluctuation problem caused by the pressure sensor data fluctuation is reduced.

[0024] Step 3: According to the AGC roll gap given data The change trend of the two cycles before and after is used to construct the pressure fluctuation formula, and the pressure fluctuation caused by the change of the given data of the AGC roll gap before and after is calculated. ; First, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material: In the formula, It is expressed as the hardness deviation ratio of the current steel material relative to the standard material, reflecting the difference in hardness between the current steel material and the standard material. It is used to calculate the pressure fluctuation and help correct the pressure sensor detection data, so that the correction of pressure is more in line with the actual characteristics of the steel. Indicates the current steel hardness measured by the hardness testing equipment, It is expressed as the standard material hardness of the same type of steel. After determination, the value remains unchanged, so the hardness deviation ratio With the current steel hardness The relationship between them is linear and positively correlated. The hardness of the current steel Higher hardness than standard materials , the hardness deviation ratio is a positive value; otherwise, it is a negative value; The change in the hardness deviation ratio of the steel material relative to the standard material will change the response characteristics of the steel to pressure during rolling. Therefore, based on the hardness deviation ratio of the current steel material relative to the standard material, the steel material coefficient is constructed: In the formula, Expressed as steel material coefficient, it is based on the hardness deviation ratio A coefficient is calculated to convert the hardness deviation into Perform nonlinear conversion to provide data for the subsequent construction of the pressure fluctuation gain coefficient. Increase, steel material coefficient Increase, when the hardness deviation ratio When it is larger, the steel material coefficient Approaching , indicating the hardness deviation of steel Material coefficient The influence is greater, otherwise it is close to , the impact is small; Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material: In the formula, It is expressed as the temperature deviation ratio of the current steel material relative to the standard material, reflecting the degree of difference between the current steel material and the standard material in terms of temperature. It provides data for more accurate evaluation of the changes in steel performance under the influence of temperature, so as to better control and adjust the rolling process under different temperature conditions. Represents the current temperature of the steel. is the standard material temperature of the same type of steel, the current steel temperature The higher the temperature deviation ratio The larger the value, the higher the standard temperature of the same steel. As a fixed parameter, its value will not change after it is determined, so it will change with the current steel temperature. The increase in temperature deviation ratio Increase, when the steel temperature Lower than the standard temperature of steel When the temperature deviation ratio If it is negative, it means that the steel temperature is lower than the standard temperature.

[0025] The temperature coefficient is calculated based on the temperature deviation ratio of the current steel material relative to the standard material: In the formula, Expressed as a temperature coefficient, proportional to the temperature deviation Positively correlated, with the temperature deviation ratio The increase in temperature coefficient Increase, realize the correction effect of temperature change on the pressure control of steel in the production process, thereby optimizing the pressure control in the production process and reducing the error caused by temperature change; The pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data before and after is constructed based on the steel material coefficient and temperature coefficient: In the formula, It is expressed as the pressure fluctuation gain coefficient caused by the change of AGC roll gap given data before and after, and the steel material coefficient and temperature coefficient The pressure fluctuation gain coefficient is determined by the product relationship , and they are positively correlated, reflecting the gain effect of steel material and temperature changes on the pressure fluctuation caused by the given data of the AGC roll gap. It is one of the data for calculating the correction amount of pressure fluctuation, and is used to correct the pressure fluctuation caused by the given data of the AGC roll gap, ensuring more accurate pressure control in the production process under different material and temperature conditions; Finally, considering the material hardness and temperature characteristics of steel, the calculation results of the pressure fluctuation amount are calculated according to the AGC roll gap given data. The changing trend of the two periods before and after is used to construct the pressure fluctuation formula: in, It is expressed as the pressure fluctuation caused by the change of AGC roll gap given data before and after, and the unit is bar. By calculating the pressure fluctuation, the relationship between the AGC roll gap given data and the pressure sensor can be corrected to ensure the accuracy of the pressure measurement data, thereby improving the automation control accuracy of the production process; It is expressed as the amplitude of the change before and after the given data of the AGC roll gap, in mm; It is expressed as the conversion coefficient between the given data of AGC roll gap and the pressure unit detected by AGC pressure sensor; It is expressed as the pressure fluctuation gain coefficient caused by the change of AGC roll gap given data. Or pressure fluctuation gain coefficient When the pressure increases, the pressure fluctuation will increase.

[0026] Step 4: The pressure fluctuation caused by the change of the AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test, the corrected pressure sensor detection data is obtained. ; The pressure fluctuation caused by the change of AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test data of pressure sensor after correction The calculation formula is: In the formula, Represents the corrected pressure sensor detection data, It indicates the pressure fluctuation caused by the change of AGC roll gap given data before and after, in bar; Represents the AGC pressure sensor detection data in bar.

[0027] Step 5: After the finishing mill starts the AGC function, delay for a certain period of time , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data ; Since the pressure sensor detects data It may be affected by various factors. Therefore, after the AGC function is started in the finishing mill, when the set delay time is reached Determine an appropriate delay time , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data , avoiding the influence of different steel material hardness and temperature conditions, thereby improving the stability of the rolling process, wherein the finishing mill starts the AGC function and delays for a certain period of time , this value is given by experience, the value range is [100,500], and the unit is ms.

[0028] Step 6: After the AGC function of the finishing mill is canceled, the AGC roll gap given data is calculated based on the corrected pressure sensor detection data Switch to pressure sensor detection data .

[0029] After the AGC function of the finishing mill is cancelled, the calculation of the pressure fluctuation amount no longer depends on the change of the given data of the roll gap, but directly uses the data detected by the pressure sensor. .

[0030] The implementation process of the method of the present invention is described below in conjunction with specific application examples.

[0031] In this application example, taking the number of finishing mill stands as 8 as an example, the operation is performed as follows: (1) Start the AGC function of the finishing mill and clarify the AGC roll gap given data , AGC pressure sensor detection data , as shown in Table 1 below: Table 1 It should be noted that the pressure detected by the AGC pressure sensor will change in real time as the controller detects and executes the cycle period, and the value in the table is a fixed value at a certain moment.

[0032] (2) Determine the AGC controller execution cycle time is 4ms, and determine the AGC roll gap given data The changing trends of the two cycles are shown in Table 2 below: Table 2 (3) According to the AGC roll gap given data The change trend of the two cycles before and after is calculated and the pressure fluctuation caused by the change of the given data of the AGC roll gap is obtained. The final result is accurately retained to 2 decimal places according to the rounding rule. The current steel hardness , standard material hardness of the same steel First, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material: Based on the hardness deviation ratio of the current steel material relative to the standard material, the steel material coefficient is constructed: Actual rolling temperature , standard rolling temperature Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material: The temperature coefficient is calculated based on the temperature deviation ratio of the current steel material relative to the standard material: The pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data before and after is constructed based on the steel material coefficient and temperature coefficient: In the formula, It is expressed as the pressure fluctuation gain coefficient caused by the change of the given data of the AGC roll gap before and after; Finally, according to the AGC roll gap given data The changing trend of the two periods before and after is used to construct the pressure fluctuation formula: in, It is expressed as the pressure fluctuation caused by the change of the given data of the AGC roll gap, in bar; in mm; It is expressed as the conversion coefficient between the given data of AGC roll gap and the pressure unit detected by AGC pressure sensor; It is expressed as the pressure fluctuation gain coefficient caused by the change of the given data of the AGC roll gap before and after, as shown in Table 3 below: Table 3 (4) The pressure fluctuation caused by the change of the AGC roll gap given data before and after is corrected to the pressure sensor detection data to obtain the corrected pressure sensor detection data, where the calculation formula is: Set the tension coefficient of each rack head And calculate the rear head tension, as shown in Table 4 below: Table 4 (5) After the AGC function is started in the finishing mill, a certain delay is made, and the AGC roll gap given data calculation based on the pressure sensor detection data is switched to the corrected pressure sensor detection data. The delay time is , as shown in Table 5 below: Table 5 (6) After the AGC function of the finishing mill is cancelled, the calculation basis of the AGC roll gap given data is switched from the corrected pressure sensor detection data to the pressure sensor detection data.

[0033] Through the above application examples, it can be found that the method of correcting the detection pressure of the finishing rolling AGC pressure sensor in hot rolling of the present invention can perform real-time dynamic correction on the use pressure of the roll gap adjustment basis after the AGC is started during the strip rolling process in actual production, which is more convenient and flexible, and has positive significance for reducing the AGC roll gap adjustment fluctuation problem caused by the pressure sensor data fluctuation and stabilizing the rolling stability of the finishing mill.

[0034] In summary, the control method of this embodiment determines the execution cycle time of the AGC controller based on the AGC roll gap given data and the pressure sensor detection data after the finishing mill starts the AGC function, judges the change trend of the AGC roll gap given data before and after the two cycles, processes and calculates the pressure fluctuation caused by the change of the AGC roll gap given data before and after, and corrects it to the pressure sensor detection data to obtain the corrected pressure sensor detection data. After the finishing mill starts the AGC function, delay for a certain period of time, and switch the calculation basis of the AGC roll gap given data to the corrected pressure sensor detection data based on the pressure sensor detection data. After the AGC function of the finishing mill is canceled, switch the calculation basis of the AGC roll gap given data to the pressure sensor detection data. This is beneficial to reducing the AGC roll gap adjustment fluctuation problem caused by the pressure sensor data fluctuation, and has positive significance for stabilizing the rolling stability of the finishing mill. The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0035] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0036] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0037] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for correcting the pressure detection of the AGC pressure sensor in hot rolling, characterized in that: include: Step 1: Start the AGC function of the finishing mill and clarify the AGC roll gap given data , AGC pressure sensor detection data ; Step 2: Determine the AGC controller execution cycle time , with the AGC controller executing the cycle time The time interval is to obtain the AGC roll gap given data in sequence The values ​​of the two cycles before and after are used to determine the AGC roll gap given data. The changing trend of the two cycles before and after; Step 3: According to the AGC roll gap given data The change trend of the two cycles before and after is used to construct the pressure fluctuation formula, and the pressure fluctuation caused by the change of the given data of the AGC roll gap before and after is calculated. ; Step 4: The pressure fluctuation caused by the change of the AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test, the corrected pressure sensor detection data is obtained. ; Step 5: After the finishing mill starts the AGC function, delay for a certain period of time , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data ; Step 6: After the AGC function of the finishing mill is canceled, the AGC roll gap given data is calculated based on the corrected pressure sensor detection data Switch to pressure sensor detection data .

2. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: The step 1 includes: Start the AGC function of the finishing mill and clarify the AGC roll gap given data , AGC pressure sensor detection data Taking the 8th stand of the finishing mill as an example, after each stand bites the steel and the AGC is started, the roll gap setting and pressure sensor detection data of each stand can be clearly determined.

3. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: The step 2 includes: Determine the AGC controller execution cycle time ,by is the time interval, in indivual The AGC roll gap given data recorded at this time point is: , in indivual The AGC roll gap given data recorded at this time point is: , construct a formula to determine the given data of AGC roll gap The changing trend of the two cycles before and after is as follows: In the formula, Indicated as AGC roll gap given data The changing trends of the two cycles before and after, Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data in the previous cycle, in mm. Expressed as indivual The AGC roll gap given data at this time point is recorded, that is, the value of the AGC roll gap given data for the next cycle, in mm, where: for A positive integer.

4. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 3, characterized in that: Determine the AGC controller execution cycle time ,in It indicates the cycle period of the real-time pressure detection of the finishing rolling AGC pressure sensor in the controller. The value is given by experience, with a range of [1-16] and the unit is ms.

5. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: Construct the pressure fluctuation caused by the change of AGC roll gap given data The method is: First, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material: In the formula, It is expressed as the hardness deviation ratio of the current steel material relative to the standard material. Indicates the current steel hardness measured by the hardness testing equipment, Expressed as standard material hardness of the same type of steel; Based on the hardness deviation ratio of the current steel material relative to the standard material, the steel material coefficient is constructed: In the formula, Expressed as steel material coefficient; Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material: The temperature coefficient is calculated based on the temperature deviation ratio of the current steel material relative to the standard material: In the formula, Expressed as temperature coefficient; The pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data before and after is constructed based on the steel material coefficient and temperature coefficient: In the formula, It is expressed as the pressure fluctuation gain coefficient caused by the change of the given data of the AGC roll gap before and after; Finally, according to the AGC roll gap given data The changing trend of the two periods before and after is used to construct the pressure fluctuation formula: in, It is expressed as the pressure fluctuation caused by the change of the given data of the AGC roll gap, in bar; It is expressed as the conversion coefficient between the given data of AGC roll gap and the pressure unit detected by AGC pressure sensor; It is expressed as the pressure fluctuation gain coefficient caused by the change of the given AGC roll gap data.

6. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 5, characterized in that: AGC roll gap given data and AGC pressure sensor detection pressure unit conversion coefficient , this value is given by experience and the range is [50-150]; the pressure fluctuation gain coefficient caused by the change of AGC roll gap given data before and after , the value range is [0.1-1].

7. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: The step 4 includes: The pressure fluctuation caused by the change of AGC roll gap given data before and after Corrected to the pressure sensor detection data In the test data of pressure sensor after correction The calculation formula is: + In the formula, Represents the corrected pressure sensor detection data, It indicates the pressure fluctuation caused by the change of AGC roll gap given data before and after, in bar; Represents the AGC pressure sensor detection data in bar.

8. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: The step 5 includes: After the finishing mill starts the AGC function, it will delay for a certain period of time. , the AGC roll gap given data is calculated based on the pressure sensor detection data Switch to corrected pressure sensor detection data .

9. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 8, characterized in that: The finishing mill starts the AGC function and then delays for a certain period of time , this value is given by experience, the value range is [100-500], and the unit is ms.

10. The method for correcting the pressure detected by the AGC pressure sensor in hot rolling according to claim 1, characterized in that: The step 6 includes: After the AGC function of the finishing mill is cancelled, the AGC roll gap given data is calculated based on the corrected pressure sensor detection data. Switch to pressure sensor detection data .

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