A system for improving the rolling stability of hot rolling mill

Abstract

The present invention discloses a system for improving the start-up stability of a hot rolling finishing mill, comprising an acquisition module, a transmission module, a database, an analysis module, and a display module: the acquisition module is used to acquire data on the initial accurate leveling values ​​of each stand, and transmit the leveling value data to the database via the transmission module for storage and setting as original data; the analysis module performs statistical analysis on the historical data stored in the database, and calculates a set of recommended accurate start-up leveling values. The advantage of the present invention is that it achieves the optimized setting of the stand leveling values ​​during the roll change and start-up process through an automated control system and data management technology. This not only improves production efficiency and product quality, but also reduces dependence on operator experience and the error rate of manual adjustment. At the same time, by displaying the most recent leveling values ​​and the recommended optimal leveling values ​​in real time, it provides a useful reference and guidance for the operator.

Description

Technical Field

[0001] The invention relates to the technical field of roll-changing and zero-adjustment rolling of a hot strip finishing mill, and in particular to a system for improving the rolling stability of a hot strip finishing mill. Background Art

[0002] The accuracy of pre-set leveling during roll change in a hot strip finishing mill is crucial for production continuity and stability. Inaccurate pre-set leveling can lead to severe deviation of the strip during rolling. This can result in product scrap and roll marks, or even worse, scrap, leading to production interruptions, severely impacting availability, and increasing production costs.

[0003] Currently, the roll leveling value often relies on manual setting. This method is limited by operator skill and production experience, and its accuracy varies greatly from person to person, resulting in significant instability. Furthermore, due to factors such as equipment replacement and production team handovers, the leveling value can fluctuate, potentially leading to problems such as head deviation and poor coil shape, increasing the pressure of rework.

[0004] Therefore, to ensure the accuracy of the preset start-up leveling values ​​for the finishing mill, a comprehensive and stable database system is urgently needed. This system can integrate historical data and provide scientific start-up leveling value recommendations, eliminating the impact of human factors and equipment changes on leveling value accuracy, thereby ensuring smooth hot-rolled strip production. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned problems of the background technology and to propose a system for improving the starting stability of a hot rolling finishing mill.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A system for improving the start-up stability of a hot rolling finishing mill comprises an acquisition module, a transmission module, a database, an analysis module, and a display module:

[0008] The acquisition module is used to acquire data of the initial accurate leveling value of each rack, and transmit the data of the leveling value to the database through the transmission module for storage and setting as original data;

[0009] The analysis module performs statistical analysis on the historical data stored in the database and calculates a set of recommended accurate opening and leveling values. The calculation formula is as follows:

[0010] L i =B i *C1+(F i -F0)*K i*β*C2;

[0011] B i : The average of the actual leveling values ​​of the i frame during the first 10 roller changes of the same set of support rollers; if the new support rollers are used less than 10 times, the cumulative average;

[0012] C1: Support roller coefficient, whether the support rollers for the first rolling are the same set as those for the previous rolling;

[0013] Yes, C1 = 80%; No, C1 = 50%;

[0014] F i : actual rolling force of stand i;

[0015] F i0 : i stand zero adjustment rolling force;

[0016] K i : i frame stiffness deviation coefficient, Ki=(LC OS -LC DS ) / 2LC OS ;

[0017] LC OS : i frame operating side stiffness value;

[0018] LC DS : i frame transmission side stiffness value;

[0019] β i : Coefficient of variation, β i =ΔH i / W;

[0020] ΔH i :i Absolute compression of the rack;

[0021] W i :target width;

[0022] C2: Support roller linkage coefficient. C1 = 80%, C2 = 20%; C1 = 50%, C2 = 50%;

[0023] The display module is used to display the leveling value of each rack and the recommended leveling value analyzed by the analysis module.

[0024] As a further solution of the present invention: the acquisition module should be able to accurately capture the leveling values ​​of each frame F1-F7 when the second block is rolled each time the rolls are changed and F7 is stable 10 seconds after biting the steel.

[0025] As a further solution of the present invention: a communication protocol between the primary control system and the secondary system is determined in the transmission module.

[0026] As a further solution of the present invention: the database can be established by selecting a suitable database system such as SQL Server, Oracle, or MySQL according to the amount and complexity of the data.

[0027] As a further solution of the present invention: a reasonable database table structure is designed to store the leveling values ​​collected each time the rolls are changed and the rolling is started, including the timestamp, the stand number, the steel type, the specification, and the leveling value fields.

[0028] The present invention's advantages lie in its ability to optimize stand leveling settings during roll change and rolling operations through automated control systems and data management technology. This not only improves production efficiency and product quality, but also reduces reliance on operator experience and the error rate associated with manual adjustments. Furthermore, by displaying the most recent leveling values ​​in real time and recommending optimal values, it provides operators with valuable reference and guidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 It is a schematic diagram of the system flow of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] See also Figure 1 As shown, the present invention is a system for improving the rolling stability of a hot rolling finishing mill, comprising an acquisition module, a transmission module, a database, an analysis module and a display module:

[0033] The acquisition module is used to acquire data of the initial accurate leveling value of each rack, and transmit the data of the leveling value to the database through the transmission module for storage and setting as original data;

[0034] The analysis module performs statistical analysis on the historical data stored in the database and calculates a set of recommended accurate opening and leveling values. The calculation formula is as follows:

[0035] L i =B i *C1+(F i -F0)*K i *β*C2;

[0036] B i : The average of the actual leveling values ​​of the i frame during the first 10 roller changes of the same set of support rollers; if the new support rollers are used less than 10 times, the cumulative average;

[0037] C1: Support roller coefficient, whether the support rollers for the first rolling are the same set as those for the previous rolling;

[0038] Yes, C1 = 80%; No, C1 = 50%;

[0039] F i : actual rolling force of stand i;

[0040] F i0 : i stand zero adjustment rolling force;

[0041] K i : i frame stiffness deviation coefficient, Ki=(LC OS -LC DS ) / 2LC OS ;

[0042] LC OS : i frame operating side stiffness value;

[0043] LC DS : i frame transmission side stiffness value;

[0044] β i : Coefficient of variation, β i =ΔH i / W;

[0045] ΔH i :i absolute compression of the rack;

[0046] W i :target width;

[0047] C2: Support roller linkage coefficient. C1 = 80%, C2 = 20%; C1 = 50%, C2 = 50%;

[0048] The display module is used to display the leveling value of each rack and the recommended leveling value analyzed by the analysis module.

[0049] It is worth adding that:

[0050] This patent is about optimizing the automated control system of a steel rolling mill, specifically the optimal control of the stand leveling value during roll change and rolling. The following is a detailed explanation of the steps and implementation plan:

[0051] 1. Data Collection

[0052] Develop control program: A professional control system engineer needs to develop a control program that can accurately capture the leveling values ​​of each frame F1-F7 at the 10th second after F7 bites the steel and stabilizes at each roll change and the second piece of rolling.

[0053] Ensure accuracy: The key to this step is to ensure the accuracy and consistency of the data, because all subsequent analysis and recommendations will be based on this raw data. For example, the rolling leveling data collected for steel coil number 4A009XX200 is shown in Table 1.

[0054] Table 1

[0055]

[0056] 2. Data Transmission

[0057] Communication protocol: Determine the communication protocol between the primary control system and the secondary system (via telegram or EDG (TMEI C) etc.).

[0058] Real-time: Ensure the real-time and reliability of data transmission so that the secondary system can receive the latest leveling value data in a timely manner.

[0059] 3. Create a database

[0060] Select a database system: Choose an appropriate database system (such as SQL Server, Oracle, MySQL, etc.) based on the amount and complexity of the data.

[0061] Data structure design: Design a reasonable database table structure to store the leveling values ​​collected at each roll change and rolling start, including fields such as timestamp, stand number, steel type, specification, and leveling value. For example, the database data structure for a piece of steel is shown in Table 2. Due to a large deviation in the F2 setting, the data collection validity is 0 and is not included in the calculation. Instead, the leveling value from the previous rolling start in the database is used.

[0062] Backup and Security: Implement regular data backup and security measures to prevent data loss or corruption.

[0063] Table 2

[0064]

[0065] 4. Level 1 display

[0066] User Interface Design: L1 developed an intuitive HMI user interface that displays the leveling values ​​of each stand after the last six roll changes and rolling stabilization. The interface is shown in Table 3.

[0067] Real-time update: Ensure that the displayed data is updated in real time to provide operators with the most accurate information for reference.

[0068] Table 3

[0069]

[0070] 5. Secondary recommendation

[0071] Data analysis: Using historical data in the database, through statistical analysis, machine learning and other methods, we calculate and recommend a set of accurate rolling leveling values. Taking the second-level calculated value Li of a certain stand as an example, the calculation formula is as follows:

[0072] L i =B i *C1+(F i -F0)*K i *β*C2;

[0073] B i : The average of the actual leveling values ​​of the i frame during the first 10 roller changes of the same set of support rollers; if the new support rollers are used less than 10 times, the cumulative average;

[0074] C1: Support roller coefficient, whether the support rollers for the first rolling are the same set as those for the previous rolling. If yes, C1 = 80%; if no, C1 = 50%

[0075] F i : Actual rolling force of stand i

[0076] F i0 : i stand zero adjustment rolling force

[0077] K i : i frame stiffness deviation coefficient, Ki=(LC OS -LC DS ) / 2LC OS ,

[0078] LC OS : i frame operating side stiffness value;

[0079] LC DS : i The stiffness value of the transmission side of the frame.

[0080] β i : Coefficient of variation, β i =ΔH i / W

[0081] ΔH i :i Absolute compression of the rack

[0082] W i :Target width

[0083] C2: Support roller linkage coefficient. C1 = 80%, C2 = 20%; C1 = 50%, C2 = 50%.

[0084] For example, Table 4 shows the F1-F7 leveling value L after the secondary calculation optimization of a roll change and rolling. I .

[0085] Optimization algorithm: As data accumulates, the recommendation algorithm is continuously optimized to improve the accuracy and efficiency of recommendations.

[0086] Send to the first level: Once L2 calculates the recommended leveling value, it is immediately displayed on the L2 screen and sent to the L1 control system. The L1 HMI has a switch for the operator to refer to or directly apply it.

[0087] Implementation Recommendations

[0088] Start with the easy and then move on to the difficult: You can start with relatively simple steps (such as step 4) and gradually move on to more complex parts (such as step 5).

[0089] Table 4

[0090]

[0091] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A system for improving the rolling stability of a hot rolling finishing mill, characterized in that: Including acquisition module, transmission module, database, analysis module and display module: The acquisition module is used to acquire data of the initial accurate leveling value of each rack, and transmit the data of the leveling value to the database through the transmission module for storage and setting as original data; The analysis module performs statistical analysis on the historical data stored in the database and calculates a set of recommended accurate rolling leveling values. The calculation formula is as follows: L i = B i *C1+ (F i -F i0 )*K i *β i * C2 B i : The average of the actual leveling values ​​of the i frame during the first 10 roller changes of the same set of support rollers; if the new support rollers are used less than 10 times, the cumulative average; C1: Support roller coefficient, whether the support rollers for the first rolling are the same set as those for the previous rolling; Yes, C1=80%; No, C1=50%; F i : actual rolling force of stand i; F i0 : i stand zero adjustment rolling force; K i : i frame stiffness deviation coefficient, K i =(LC OS -LC DS ) / 2LC OS ; LC OS : i frame operating side stiffness value; LC DS : i frame transmission side stiffness value; β i : Coefficient of variation, β i =ΔH i / W i ; ΔH i : i absolute compression of the rack; W i :i rack target width; C2: Support roller linkage coefficient, C1=80%, C2=20%; C1=50%, C2=50%; The display module is used to display the leveling value of each rack and the analysis module is used to analyze the recommended rolling leveling value.

2. A system for improving the rolling stability of a hot rolling finishing mill according to claim 1, characterized in that: The acquisition module should be able to accurately capture the leveling values ​​of each frame F1-F7 when the second piece is rolled each time the rolls are changed and F7 is stable 10 seconds after biting the steel.

3. The system for improving the rolling stability of a hot rolling finishing mill according to claim 1, characterized in that: The communication protocol between the primary control system and the secondary system is determined in the transmission module.

4. The system for improving the rolling stability of a hot rolling finishing mill according to claim 1, characterized in that: The database is established by selecting a suitable database system according to the amount and complexity of the data, and the database system is SQL Server, Oracle or MySQL.

5. The system for improving the rolling stability of a hot rolling finishing mill according to claim 4, characterized in that: Design a reasonable database table structure to store the leveling values ​​collected at each roll change and rolling, including timestamp, stand number, steel type, specification and leveling value fields.

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