Control method for improving small thickness of head and tail of steel plate
By setting an initial roll gap compensation value before the rolling mill and adjusting it in real time, the problem of insufficient thickness at the beginning and end of the steel plate in the production of heavy plate rolling was solved, the uniformity and precision of the thickness of the steel plate along its entire length were improved, production costs were reduced, and the production needs of steel plates of different specifications were met.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 常熟市龙腾新能装备科技有限公司
- Filing Date
- 2026-03-10
- Publication Date
- 2026-05-12
AI Technical Summary
In the production process of heavy plate rolling, the thickness of the beginning and end of the steel plate is too small, resulting in uneven product thickness, which cannot meet the requirements of high-end customers, and increases production costs and wastes resources.
By setting an initial roll gap compensation value based on the target thickness range of the steel plate before the rolling mill, and adjusting the roll gap in real time during the rolling process, and using the coordinated control of electric and hydraulic pressing systems, pre-compensation in the head and tail areas is achieved, ensuring the uniformity of the steel plate thickness along its entire length.
It effectively solves the problem of insufficient thickness at the beginning and end of the steel plate, improves the product thickness accuracy and yield, reduces production costs, enhances the stability and flexibility of the production process, and meets the needs of high-end customers.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of medium and heavy plate rolling production technology, and is specifically applied to the automatic thickness control in the production process of heavy plate rolling, especially for the control scenario of the steel plate having too small a thickness at the beginning and end. Background Technology
[0002] In the heavy plate manufacturing industry, the four-high rolling mill is one of the core production equipment. Its roll gap control mainly relies on the coordinated action of the electric and hydraulic reduction systems to achieve the target thickness of the steel plate by precisely adjusting the roll gap size. However, in actual production, due to the complex dynamic characteristics of steel plate rolling, there are many influencing factors: on the one hand, when the head and tail of the steel plate enter the rolling mill, there is a lack of sufficient tension support, resulting in a difference in the stress state of the roll gap between the rolling mill and the middle part of the steel plate; on the other hand, the existing control program does not have a special compensation design for the special working conditions of head and tail rolling, causing deviations in the coordinated control accuracy of electric and hydraulic reduction in the head and tail regions.
[0003] The aforementioned issues directly result in areas of abnormally thin thickness at the beginning and end of the produced steel plates. The thickness in these areas is often below the allowable deviation range specified in the design. This thickness defect leads to a series of adverse consequences: First, steel plates with insufficient thickness at the beginning and end cannot meet the requirements of high-end customers for uniform thickness throughout the entire length of the product, limiting the product's application scenarios; second, to avoid product defects due to insufficient thickness at the beginning and end, companies need to reserve a larger thickness allowance, resulting in a waste of steel resources; furthermore, the thinner beginning and end sections may require subsequent cutting, increasing production processes and costs, while also reducing overall production efficiency. Summary of the Invention
[0004] The purpose of this invention is to provide a method for controlling the excessive thickness at the beginning and end of steel plates, thereby solving the problem of insufficient thickness at the beginning and end of steel plates in the production of thick plates in the prior art.
[0005] The present invention provides a method for controlling the insufficient thickness at the beginning and end of a steel plate, comprising the following steps: S1. Production preparation stage: Based on the target thickness of the steel plate to be rolled, determine the preset thickness range to which it belongs, and retrieve the initial roll gap compensation value corresponding to the thickness range from the human-machine interface (HMI). S2. Parameter Confirmation and Correction: Based on the thickness test data of steel plates of similar specifications in recent times, the operator determines whether the initial compensation value needs to be adjusted. If adjustment is required, the corrected compensation value is entered through the compensation modification dialog box of the human-machine interface (HMI). S3. Pre-compensation setting: After receiving the compensation value parameter confirmed in S2, the mill control system automatically adjusts the pressing system before the steel plate bites into the mill to complete the pre-compensation adjustment of the roll gap. S4. Rolling execution: This includes: S41. Head Compensation Rolling Execution Steps: After the mill control system detects the steel plate bite signal, it starts head compensation control and calculates the length of the steel plate head passing through based on the real-time speed of the main drive. When the calculated length is less than the preset head compensation action length, the pre-compensated roll gap state is maintained. When the calculated length reaches the head compensation action length, the mill hydraulic roll gap control cylinder is controlled to move and restore the roll gap to the set roll gap position corresponding to the target thickness, and the head compensation ends. S42. Rolling steps for intermediate target thickness section: The steel plate is rolled according to the conventional rolling process; S43. Tail-end compensation rolling execution steps: During the rolling process, the rolling mill control system calculates the remaining rolling length of this pass in real time. When the remaining rolling length is less than the preset tail-end compensation length, the rolling mill is controlled to adjust the roll gap to the compensation setting value until the rolling of this pass is completed. S5. Post-rolling inspection and feedback: Perform full-length thickness inspection on the rolled steel plate, record the thickness data of the beginning and end parts, and use it for optimization and adjustment of compensation parameters in subsequent batches.
[0006] Furthermore, in the S41 head compensation rolling execution step, the specific method for calculating the steel plate head passage length based on the main drive real-time speed is as follows: The main transmission speed signal after the steel plate bites is integrated over time to calculate the head length of the steel plate that has entered the rolling mill in real time. When the integrated calculation value reaches the preset head compensation length, the head compensation end signal is triggered.
[0007] Furthermore, in the S43 tail-end compensation rolling execution step, the specific method for real-time calculation of the remaining rolling length for this pass is as follows: Obtain the total length of the steel plate in this pass calculated by the secondary model and the real-time length of the steel plate during the rolling process; calculate the difference between the total length and the real-time length, and use this difference as the remaining rolling length. When the remaining rolling length is less than the preset tail compensation length, tail compensation is triggered to start.
[0008] Furthermore, the preset thickness range in S1 includes multiple continuous ranges, each range corresponding to a preset initial roll gap compensation value.
[0009] Furthermore, the preset thickness range and the corresponding initial roll gap compensation value are: When the target thickness is 80mm to 120mm, the initial roll gap compensation value is 0.3mm; When the target thickness is 120mm to 150mm, the initial roll gap compensation value is 0.3mm; When the target thickness is 150mm to 200mm, the initial roll gap compensation value is 0.5mm; When the target thickness is 200mm to 250mm, the initial roll gap compensation value is 1.0mm; When the target thickness is 250mm to 300mm, the initial roll gap compensation value is 1.2mm; When the target thickness is 300mm to 500mm, the initial roll gap compensation value is 1.5mm.
[0010] Furthermore, the pressing system in S3 includes an electric pressing system and a hydraulic pressing system; the pre-compensation setting is coarsely adjusted by the electric pressing system and finely adjusted by the hydraulic pressing system to complete the pre-compensation adjustment of the roll gap.
[0011] Furthermore, during the S4 rolling process, the mill control system monitors the rolling force, steel plate thickness changes, and actual roll gap value in real time, and makes dynamic adjustments through the hydraulic pressing system to ensure the stability of the rolling process.
[0012] Furthermore, the head and tail thickness data recorded in the S5 rolling post-rolling inspection and feedback are stored in the database to update the reference data on the human-machine interface, which can be accessed by the operator in subsequent production preparation steps.
[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The present invention provides a method for controlling the thickness of the beginning and end of steel plates, which completely solves the problem of insufficient thickness at the beginning and end of steel plates: through targeted roll gap pre-compensation, the thickness loss caused by the change in stress characteristics in the beginning and end areas is effectively offset, so that the thickness of the beginning and end of the steel plate meets the design requirements, the thickness deviation is controlled within the allowable range, and the defect of insufficient thickness at the beginning and end is eliminated. Furthermore, by adopting the control method of the present invention, the thickness difference between the steel plate and the plate is significantly reduced throughout the entire length range, the overall thickness fluctuation is reduced, and the product thickness accuracy is greatly improved, which can meet the strict requirements of high-end customers for product quality.
[0014] Furthermore, through the closed-loop adjustment mechanism of the HMI interface, it can quickly adapt to changes in different specifications of steel plates and different production conditions without the need for hardware modifications to the rolling mill equipment. Compensation and optimization can be achieved simply by adjusting software parameters. It is convenient to operate, highly flexible, and reduces the dependence on the experience of operators, thereby improving the stability and controllability of the production process. Detailed Implementation
[0015] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0017] The present invention provides a method for controlling the thinness of the beginning and end of a steel plate. The core of this method is to pre-compensate the roll gap of the rolling mill according to the target thickness range of the steel plate before the steel plate is bitten. By setting a targeted compensation value in advance, the thickness loss caused by the change of stress characteristics in the beginning and end areas is offset, so as to significantly reduce the thickness difference between the steel plate and the middle part of the steel plate throughout the entire length range, thereby ensuring the thickness uniformity of the beginning and end parts of the steel plate and the middle part.
[0018] Specifically, it includes the following steps: S1. Production preparation stage: Based on the target thickness of the steel plate to be rolled, determine the preset thickness range to which it belongs, and retrieve the initial roll gap compensation value corresponding to the thickness range from the human-machine interface (HMI). Based on extensive production experimental data and theoretical analysis, this invention divides the target thickness of the steel plate into 6 consecutive intervals and sets a corresponding roll gap compensation value for each interval. The preset target thickness intervals and corresponding initial roll gap compensation values are as follows:
[0019] The above compensation value is set based on the following: For the thinner range (80-150mm), the rigidity of the steel plate is relatively weak, and the tension loss at the beginning and end of the rolling mill has a smaller impact. Therefore, setting a lower compensation value (0.3mm) is sufficient to meet the thickness control requirements. As the target thickness of the steel plate increases (150-500mm), the rigidity of the steel plate gradually increases, and the force exerted on the mill roll gap at the beginning and end of the plate changes more significantly, increasing the risk of thickness loss. Therefore, the compensation value should be increased accordingly to ensure that the compensation effect matches the degree of thickness loss.
[0020] S2. Parameter Confirmation and Correction: Based on the thickness test data of steel plates of similar specifications in recent times, the operator determines whether the initial compensation value needs to be adjusted. If adjustment is required, the corrected compensation value is entered through the compensation modification dialog box of the human-machine interface (HMI). To adapt to changes in different production batches, raw material characteristics, and equipment operating status, this invention integrates the aforementioned compensation values into the rolling mill's HMI (Human-Machine Interface), allowing operators to make flexible adjustments based on the actual production conditions on site.
[0021] S3. Pre-compensation setting: After receiving the compensation value parameters confirmed in S2, the mill control system automatically adjusts the reduction system before the steel plate bites into the mill to complete the pre-compensation adjustment of the roll gap. The reduction system includes an electric reduction system and a hydraulic reduction system. The electric reduction system is used for coarse adjustment, and the hydraulic reduction system is used for fine adjustment to complete the pre-compensation adjustment of the roll gap.
[0022] S4. Rolling execution: This includes: S41. Head Compensation Rolling Execution Steps: After the mill control system detects the steel plate bite signal, it starts head compensation control and calculates the length of the steel plate head passing through based on the real-time speed of the main drive. When the calculated length is less than the preset head compensation action length, the pre-compensated roll gap state is maintained. When the calculated length reaches the head compensation action length, the mill hydraulic roll gap control cylinder is controlled to move and restore the roll gap to the set roll gap position corresponding to the target thickness, and the head compensation ends. The specific method for calculating the length of the steel plate head based on the real-time speed of the main transmission is as follows: the main transmission speed signal after the steel is bitten is integrated over time to calculate the length of the steel plate head that has entered the rolling mill in real time. When the integrated calculation value reaches the preset head compensation length, the head compensation end signal is triggered.
[0023] S42. Rolling steps for intermediate target thickness section: The steel plate is rolled according to the conventional rolling process; S43. Tail-end compensation rolling execution steps: During the rolling process, the rolling mill control system calculates the remaining rolling length of this pass in real time. When the remaining rolling length is less than the preset tail-end compensation length, the rolling mill is controlled to adjust the roll gap to the compensation setting value until the rolling of this pass is completed. The specific method for calculating the remaining rolling length in real time for this pass is as follows: obtain the total length of the steel plate in this pass calculated by the secondary model and the real-time length of the steel plate during the rolling process; calculate the difference between the total length and the real-time length, and take the difference as the remaining rolling length; when the remaining rolling length is less than the preset tail compensation length, the tail compensation is triggered.
[0024] Throughout the rolling process, the mill control system monitors the rolling force, steel plate thickness changes, and actual roll gap value in real time, and makes dynamic adjustments through the hydraulic pressing system to ensure the stability of the rolling process.
[0025] S5. Post-rolling inspection and feedback: The rolled steel plate undergoes full-length thickness inspection, and the thickness data of the beginning and end portions is recorded. This data is stored in a database to update the reference data on the human-machine interface (HMI), allowing operators to access it during subsequent production preparation steps. Specifically, operators inspect the full length of the rolled steel plate, focusing on recording the actual thickness data of the beginning and end portions. They compare the actual thickness data with the target thickness requirements, analyze deviations, and if the beginning and end thicknesses are still too small or too large, they can fine-tune the compensation value for the corresponding thickness range through the compensation modification dialog box on the HMI. The adjusted compensation value takes effect immediately, and the new compensation parameters are used for the next batch of steel plates rolled, forming a closed-loop control of "inspection-adjustment-optimization" to ensure that the compensation effect continuously meets production requirements.
[0026] The present invention will be further described in detail below with reference to specific embodiments. Example
[0027] This embodiment was implemented on a 3800mm medium-thick plate rolling mill production line. The rolled steel plate specifications were 180mm×2050mm×6980mm, the material was Q235B, which is a conventional non-temperature-controlled rolled steel plate and belongs to the medium-thickness specification steel plate.
[0028] S1. Production Preparation Stage: The operator inputs the target thickness of 180mm into the HMI interface. The control system queries the preset thickness range lookup table to determine that it falls within the 150-200mm range and retrieves the corresponding initial roll gap compensation value of 0.5mm. Simultaneously, based on experience, the head compensation length and tail compensation length are set to 800mm.
[0029] S2. Parameter Confirmation and Correction: The operator reviewed the database history and found that when using a compensation value of 0.5mm, the average thickness of the head of the steel plate of the same specification was 179.35mm, the average thickness of the tail was 179.22mm, and the average thickness of the middle was (179.96)mm. The thickness of the head and tail were slightly lower than the limit. Considering that this batch of steel billets was a special rolling contract with high requirements for thickness accuracy, the operator adjusted the compensation value to 0.8mm through the HMI compensation modification dialog box and clicked "Real-time effect".
[0030] S3, Pre-compensation setting: The control system receives the corrected compensation value of 0.8mm. Before the steel plate bites in, the electric pressing system is coarsely adjusted and the hydraulic pressing system is finely adjusted to set the unloaded roll gap to 180.8mm (target thickness 180mm - compensation value 0.8mm).
[0031] S4. Rolling execution: Head compensation rolling execution: After the bite signal is triggered, the speed integral in the control system calculates the length of the head passing through. When the calculated length is less than 800mm, the compensation roll gap is maintained at 180.8mm; when it reaches 800mm, the roll gap is restored to the standard value of 180mm, and the head compensation ends.
[0032] Rolling of the intermediate target thickness section: The intermediate section is controlled by conventional AGC, and the thickness is kept stable within the range of 180±0.15mm.
[0033] Tail compensation rolling execution: When the remaining rolling length of the last pass is less than 800mm, tail compensation is triggered, and the roll gap is adjusted from 180mm to 180.8mm and maintained until the end of rolling.
[0034] S5. Post-rolling inspection and feedback: Test data shows that the head thickness is 179.96mm, the tail thickness is 179.88mm, and the middle thickness is 180.0mm. The control effect is ideal. The system automatically stores the data of this batch (with a corrected compensation value of 0.8mm) into the database as an important reference for subsequent batches.
[0035] To verify the adaptability of the present invention to different thickness ranges, several typical specifications were selected for mass production under essentially the same conditions as in Example 1. The results are shown in the table below:
[0036] As can be seen from the table above, the method of the present invention is applicable to steel plates of different thicknesses. Through the mechanism of initial compensation value plus manual correction, the thickness difference between the beginning, middle and end of the plate can be effectively controlled within the range of 0-0.5mm.
[0037] Comparative Example 1 To verify the technical effect of the present invention, a comparative test was conducted on the same production line. 180mm specification steel plates were produced using the same rolling process, but the head and tail compensation control method of the present invention was not used (i.e., the compensation value was set to 0 in the S3 pre-compensation setting step).
[0038] After rolling, the inspection showed that the thickness of the head was 178.58mm, the thickness of the tail was 178.66mm, and the thickness of the middle was 180.0mm. The thickness of the head and tail was obviously too thin, and the length of the head and tail needs to be increased (the length of the steel plate needs to be increased from the conventional 6000mm to 6200mm), and the yield rate will decrease by about 3.3%.
[0039] Comparative Example 2 When using a conventional fixed-time trigger compensation method (similar to CN103252353B scheme) to produce 180mm steel plates, the abnormal thickness at the beginning and end needs to be cut off, requiring an increase in length allowance or an increase in the overall steel plate thickness, resulting in a low yield.
[0040] In summary, through comparison, it can be seen that the present invention, through a closed-loop control process of "production preparation - manual correction - pre-compensation - stable rolling - inspection feedback," enables the processed steel plate to have the following characteristics: High precision: It adopts length-based head and tail compensation triggering logic, which is adaptive to the rolling speed and the compensation timing is accurate, which can effectively control the thickness difference between the head, middle and tail of the plate within the range of 0-0.5mm. Comprehensive coverage: It simultaneously solves the problem of insufficient thickness at the head and tail, and the compensation length at the head and tail can be set independently to adapt to the control requirements of steel plates of different specifications. Adjustable: The compensation value can be flexibly corrected through the HMI human-machine interface, forming a closed-loop control of "detection-adjustment-optimization" to adapt to changes in production conditions; Easy to implement: The compensation value directly corresponds to the target thickness range, and its physical meaning is clear. Operators can master it without understanding complex mathematical models. High efficiency: Effectively reduces the length of the cut ends, increases the yield by about 1-1.5%, resulting in significant economic benefits. It completely solves the problem of insufficient thickness at the beginning and end of the steel plate. Through targeted roll gap pre-compensation, it effectively offsets the thickness loss caused by changes in stress characteristics in the beginning and end areas, ensuring that the thickness of the beginning and end of the steel plate meets the design requirements. The thickness deviation is controlled within the allowable range, eliminating the defect of insufficient local thickness.
[0041] In addition, by adopting the control method of the present invention, the thickness difference between the steel plates is significantly reduced throughout the entire length range, the overall thickness fluctuation is reduced, and the product thickness accuracy is greatly improved, which can meet the strict requirements of high-end customers for product quality. Improved yield and reduced production costs: Since the issue of thickness deviation at the beginning and end of steel plates is resolved, there is no longer a need to reserve extra thickness margin to avoid insufficient thickness at the beginning and end. The overall thickness control standard can be appropriately lowered. While ensuring product quality, this increases the effective usable length of a single steel plate, improving steel utilization and yield, reducing raw material waste, and lowering the production cost per unit. Enhanced production stability and flexibility: Through the closed-loop adjustment mechanism of the HMI interface, it can quickly adapt to changes in different specifications of steel plates and different production conditions. No hardware modifications to the rolling mill are required; compensation and optimization can be achieved solely through software parameter adjustments. This is convenient, highly flexible, and reduces reliance on operator experience, improving the stability and controllability of the production process. Enhanced market competitiveness: The implementation of this invention enables enterprises to produce wide and thick plate products with higher thickness uniformity and more stable quality, expanding the application range of products, enhancing the enterprise's core competitiveness in the market, and bringing better economic and social benefits to the enterprise.
[0042] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A method for controlling the insufficient thickness at the beginning and end of a steel plate, characterized in that, Includes the following steps: S1. Production preparation stage: Based on the target thickness of the steel plate to be rolled, determine the preset thickness range to which it belongs, and retrieve the initial roll gap compensation value corresponding to the thickness range from the human-machine interface (HMI). S2. Parameter Confirmation and Correction: Based on the thickness test data of steel plates of similar specifications in recent times, the operator determines whether the initial compensation value needs to be adjusted. If adjustment is required, the corrected compensation value is entered through the compensation modification dialog box of the human-machine interface (HMI). S3. Pre-compensation setting: After receiving the compensation value parameter confirmed in S2, the mill control system automatically adjusts the pressing system before the steel plate bites into the mill to complete the pre-compensation adjustment of the roll gap. S4. Rolling execution: This includes: S41. Head Compensation Rolling Execution Steps: After the mill control system detects the steel plate bite signal, it starts head compensation control and calculates the length of the steel plate head passing through based on the real-time speed of the main drive. When the calculated length is less than the preset head compensation action length, the pre-compensated roll gap state is maintained. When the calculated length reaches the head compensation action length, the mill hydraulic roll gap control cylinder is controlled to move and restore the roll gap to the set roll gap position corresponding to the target thickness, and the head compensation ends. S42. Rolling steps for intermediate target thickness section: The steel plate is rolled according to the conventional rolling process; S43. Tail-end compensation rolling execution steps: During the rolling process, the rolling mill control system calculates the remaining rolling length of this pass in real time. When the remaining rolling length is less than the preset tail-end compensation length, the rolling mill is controlled to adjust the roll gap to the compensation setting value until the rolling of this pass is completed. S5. Post-rolling inspection and feedback: Perform full-length thickness inspection on the rolled steel plate, record the thickness data of the beginning and end parts, and use it for optimization and adjustment of compensation parameters in subsequent batches.
2. The method for controlling the thickness of the steel plate at the beginning and end during the rolling process of thick plates according to claim 1, characterized in that, In the S41 head compensation rolling execution step, the specific method for calculating the steel plate head passage length based on the main drive real-time speed is as follows: The main transmission speed signal after the steel plate bites is integrated over time to calculate the head length of the steel plate that has entered the rolling mill in real time. When the integrated calculation value reaches the preset head compensation length, the head compensation end signal is triggered.
3. The method for controlling the thickness of the steel plate at the beginning and end during the rolling process of thick plates according to claim 1 or 2, characterized in that, In the S43 tail compensation rolling execution step, the specific method for real-time calculation of the remaining rolling length for this pass is as follows: Obtain the total length of the steel plate in this pass calculated by the secondary model and the real-time length of the steel plate during the rolling process; calculate the difference between the total length and the real-time length, and use this difference as the remaining rolling length. When the remaining rolling length is less than the preset tail compensation length, tail compensation is triggered to start.
4. The method for controlling the thinness of the steel plate at both ends according to claim 3, characterized in that, The preset thickness range in S1 includes multiple continuous ranges, each range corresponding to a preset initial roll gap compensation value.
5. The method for controlling the thinness of the steel plate at both ends according to claim 4, characterized in that, The preset thickness range and the corresponding initial roll gap compensation value are: When the target thickness is 80mm to 120mm, the initial roll gap compensation value is 0.3mm; When the target thickness is 120mm to 150mm, the initial roll gap compensation value is 0.3mm; When the target thickness is 150mm to 200mm, the initial roll gap compensation value is 0.5mm; When the target thickness is 200mm to 250mm, the initial roll gap compensation value is 1.0mm; When the target thickness is 250mm to 300mm, the initial roll gap compensation value is 1.2mm; When the target thickness is 300mm to 500mm, the initial roll gap compensation value is 1.5mm.
6. The method for controlling the thinness of the steel plate at both ends according to claim 1 or 5, characterized in that, The pressing system in S3 includes an electric pressing system and a hydraulic pressing system; the pre-compensation setting is coarsely adjusted by the electric pressing system and finely adjusted by the hydraulic pressing system to complete the pre-compensation adjustment of the roll gap.
7. The method for controlling the thinness of the steel plate at both ends according to claim 6, characterized in that, During the S4 rolling process, the mill control system monitors the rolling force, steel plate thickness changes, and actual roll gap value in real time, and makes dynamic adjustments through the hydraulic pressing system to ensure the stability of the rolling process.
8. The method for controlling the thinness of the steel plate at both ends according to claim 1 or 7, characterized in that, The head and tail thickness data recorded in the S5 rolling post-rolling inspection and feedback are stored in the database and used to update the reference data on the human-machine interface for operators to access in subsequent production preparation steps.