A method for setting finishing rolling speed and strip water parameters

Abstract

The embodiment of the present application provides a kind of finish rolling speed and strip water parameter setting method, comprising: when the head of strip reaches the entrance of finish rolling unit, the head temperature of strip is detected, and the corresponding strip work plan parameter of the strip is obtained from work plan;According to the head temperature of the strip and corresponding work plan parameter, the speed of strip and cooling water parameter table are inquired, and the target record item is matched to obtain, the speed parameter and cooling water supply parameter corresponding to the target record item are used as the speed parameter and cooling water supply parameter of the strip during finish rolling;The speed parameter and cooling water supply parameter of the strip during finish rolling are sent to secondary model.

Description

Technical Field

[0001] This invention relates to the field of hot strip rolling technology, and more particularly to a method for setting finishing rolling speed and strip steel parameters. Background Technology

[0002] In the hot strip rolling process, the finishing mill needs to control the finishing mill exit temperature of the steel coil to meet the process target requirements. Traditional control methods include: (1) adjusting the water output at a fixed speed, using a fixed strip moving speed, and adjusting the strip cooling water output according to the finishing mill inlet temperature to control the finishing mill exit temperature to meet the target. (2) adjusting the strip cooling water output at a fixed speed, using a fixed strip cooling water output, and adjusting the strip moving speed according to the finishing mill inlet temperature to control the finishing mill exit temperature to meet the target. The inventors found that frequent water adjustment at a fixed speed would affect the thickness setting, while fixed water speed adjustment would cause large changes in strip speed when the strip inlet temperature changed significantly, disrupting the production rhythm.

[0003] In the process of developing this invention, the applicant discovered at least the following problems in the prior art:

[0004] In finishing milling, simply adjusting the coil moving speed or the cooling water output alone cannot simultaneously address the target thickness of the coil and the production rhythm. Summary of the Invention

[0005] This invention provides a method for setting finishing rolling speed and strip steel parameters, which solves the technical problem that adjusting the coil moving speed or the cooling water output alone in finishing rolling cannot simultaneously take into account the target thickness of the coil and the production rhythm.

[0006] To achieve the above objectives, in one aspect, embodiments of the present invention provide a method for setting finishing rolling speed and strip steel parameters, including:

[0007] When the head of the strip reaches the entrance of the finishing mill, the head temperature of the strip is detected, and the corresponding work plan parameters of the strip are obtained from the work plan.

[0008] Based on the head temperature of the strip and the corresponding work plan parameters, the strip speed and cooling water parameter table is queried to obtain the target record item. The speed parameters and cooling water supply parameters corresponding to the target record item are used as the speed parameters and cooling water supply parameters of the strip during the finishing rolling process. The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip, and the range of head temperature of the target record item includes the head temperature of the strip.

[0009] The speed parameters and cooling water supply parameters of the strip during finishing rolling are sent to the secondary model;

[0010] The secondary model is used to control the moving speed of the strip according to the speed parameters of the strip during the finishing rolling process, and at the same time control the cooling water supply according to the cooling water supply parameters of the strip during the finishing rolling process, so as to control the outlet temperature of the strip at the outlet of the finishing mill at the target required outlet temperature.

[0011] The strip speed and cooling water parameter table includes multiple record items; each record item includes a corresponding work plan parameter range, head temperature range, speed parameter, and cooling water supply parameter; the strip speed and cooling water parameter table includes multiple record items whose work plan parameter ranges match the work plan parameters corresponding to the strip and have different head temperature ranges; all head temperature ranges corresponding to the multiple record items whose work plan parameter ranges match the work plan parameters corresponding to the strip and have different head temperature ranges do not overlap; the temperature range obtained by connecting all head temperature ranges corresponding to the multiple record items whose work plan parameter ranges match the work plan parameters corresponding to the strip and have different head temperature ranges from low to high is equal to the inlet temperature variation range of the strip at the entrance of the finishing mill; the speed parameters corresponding to different record items whose work plan parameter ranges match the work plan parameters corresponding to the strip and have different head temperature ranges are the same or different; the cooling water supply parameters corresponding to different record items whose work plan parameter ranges match the work plan parameters corresponding to the strip and have different head temperature ranges are the same or different.

[0012] Furthermore, the range of work plan parameters corresponding to each record item includes: the corresponding steel grade, the range of finished product thickness, and the range of finished product width;

[0013] The work plan parameters corresponding to the strip steel include the corresponding steel grade, finished product thickness, and finished product width;

[0014] The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, specifically including:

[0015] The steel grade in the work plan parameters corresponding to the strip is the same as the steel grade in the work plan parameter range corresponding to the target record item, and the finished product thickness in the work plan parameters corresponding to the strip is within the finished product thickness range in the work plan parameter range corresponding to the target record item, and the finished product width in the work plan parameters corresponding to the strip is within the finished product width range in the work plan parameter range corresponding to the target record item.

[0016] Furthermore, the range of work plan parameters corresponding to each record item also includes: the corresponding single / dual furnace mode and hot roll box commissioning mode;

[0017] The work plan parameters corresponding to the strip steel also include the corresponding single / double furnace mode and hot coil box commissioning mode.

[0018] The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, and also includes:

[0019] The single / double furnace mode in the work plan parameters corresponding to the strip steel is the same as the single / double furnace mode in the work plan parameter range corresponding to the target record item, and the hot coil box commissioning mode in the work plan parameters corresponding to the strip steel is the same as the hot coil box commissioning mode in the work plan parameter range corresponding to the target record item.

[0020] Furthermore, the speed parameters include: threading reference speed, threading minimum speed, threading maximum speed, running speed, steel throwing speed, first acceleration, second acceleration, and steel throwing acceleration.

[0021] Furthermore, the cooling water supply parameters include: the strip cooling water supply switch status of the 2nd to N-1th finishing mills from upstream to downstream in the finishing mill group; wherein, the finishing mill group includes N finishing mills numbered 1 to N from upstream to downstream.

[0022] Furthermore, the temperature variation range of the strip head at the entrance of the finishing mill includes an abnormally low temperature range, a normal rolling temperature range, and an abnormally high temperature range.

[0023] In the strip speed and cooling water parameter table, for all record items that match the work plan parameters corresponding to the strip, the width of the head temperature range in the abnormal low temperature range is greater than the width of the head temperature range in the normal rolling temperature range, and the width of the head temperature range in the normal rolling temperature range is greater than the width of the head temperature range in the abnormal high temperature range.

[0024] The normal rolling temperature range is determined by the steel grade, finished product thickness, and finished product width of the work plan parameters corresponding to the strip; the abnormally low temperature range is the temperature range below the normal rolling temperature range within the range of inlet temperature variation; the abnormally high temperature range is the temperature range above the normal rolling temperature range within the range of inlet temperature variation; all records matching the work plan parameters corresponding to the strip are records that satisfy the requirement that the corresponding work plan parameter range includes the work plan parameters corresponding to the strip.

[0025] Preferably, for hot-rolled strip steel with a thickness of 4 to 20 mm and a width of 1500 mm, the abnormal low temperature range is 850 to 970 degrees Celsius, the normal rolling temperature range is 970 to 1010 degrees Celsius, and the abnormal high temperature range is 1010 to 1150 degrees Celsius.

[0026] Furthermore, in the strip speed and cooling water parameter table, for all records matching the work plan parameters corresponding to the strip, the head temperature range has the following characteristics: the head temperature range width within the abnormally low temperature range is 46 to 55 degrees Celsius; the head temperature range width within the normal rolling temperature range is 35 to 45 degrees Celsius; and the head temperature range width within the abnormally high temperature range is 15 to 25 degrees Celsius. All records matching the work plan parameters corresponding to the strip are records whose corresponding work plan parameter range includes the work plan parameters corresponding to the strip.

[0027] Furthermore, when the hot coil box is not in use, the average temperature of the temperature data of the front strip of the strip from 1 / 3 to 2 / 3 of the length starting from the head of the strip is collected at the exit of the finishing mill.

[0028] The average temperature is compared with the target required exit temperature. If the average temperature is lower than the target required exit temperature, the running speed of the strip during the finishing rolling is accelerated. If the average temperature is higher than the target required exit temperature, the running speed of the strip during the finishing rolling is decelerated.

[0029] The speed parameters of the strip during finishing rolling include the running speed.

[0030] Further, the comparison of the average temperature with the target required exit temperature, wherein if the average temperature is lower than the target required exit temperature, the running speed of the strip during finishing rolling is accelerated; and if the average temperature is higher than the target required exit temperature, the running speed of the strip during finishing rolling is decelerated, including:

[0031] Calculate the temperature deviation between the average temperature and the target required outlet temperature;

[0032] Based on the temperature deviation value and the steel grade, finished product thickness and finished product width of the corresponding work plan parameters of the strip, query the running speed self-learning correction table, select the target correction record, and add the speed correction value in the target correction record to the running speed in the speed parameters of the strip during the finishing rolling. Use the result of the addition to update the running speed in the speed parameters of the strip during the finishing rolling.

[0033] The self-learning correction table for operating speed includes multiple correction records. Each correction record includes the corresponding steel grade, lower limit of finished product thickness, upper limit of finished product thickness, lower limit of finished product width, upper limit of finished product width, lower limit of temperature deviation value, upper limit of temperature deviation value, and speed correction value. The self-learning correction table for operating speed is pre-created by statistically analyzing historical production data. The lower limit and upper limit of temperature deviation value corresponding to the same correction record are both greater than zero or less than zero, and the positive and negative signs of the speed correction value corresponding to the same correction record are opposite to the positive and negative signs of the lower limit and upper limit of temperature deviation value.

[0034] The steel grade in the target correction record is the same as the steel grade in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the finished product thickness in the target correction record includes the finished product thickness in the work plan parameter corresponding to the strip steel, the range formed by the lower limit and upper limit of the finished product width in the target correction record includes the finished product width in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the temperature deviation value in the target correction record includes the temperature deviation value.

[0035] Furthermore, production data during the production process is collected, and the strip speed and cooling water parameter tables are updated based on the production data.

[0036] The above technical solution has the following beneficial effects: It categorizes the temperature variation range of the strip at the inlet of the finishing mill, obtaining multiple head temperature ranges, and sets corresponding speed and cooling water supply parameters for different head temperature ranges. This creates a widely adaptable, stable, and accurate strip speed and cooling water parameter table, improving the stability and accuracy of speed and cooling water parameter settings. When the strip begins finishing, the corresponding work plan parameters and head temperature of the strip obtained from the work plan are used as search conditions to query the strip speed and cooling water parameter table, obtain the speed and cooling water supply parameters, and transmit them to the secondary model for the control settings of this strip block. This achieves automatic speed and cooling water setting control to ensure the finishing mill exit temperature meets the target exit temperature requirements. It achieves the purpose of speed and temperature control with small changes in the finishing mill inlet temperature and speed and temperature control with large changes in the finishing mill inlet temperature, which is beneficial to the calculation accuracy of the secondary model and the stability of the production rhythm. This invention innovatively introduces retrieval conditions such as graded ranges of finishing mill inlet temperature variation with almost zero cost investment, significantly improving the stability and accuracy of finishing mill speed and strip steel retrieval parameters. It can adapt to temperature and mode changes under various product specifications, achieving the purpose of speed and temperature control with small changes in finishing mill inlet temperature and water speed and temperature control with large changes in finishing mill inlet temperature. It avoids steel plate quality fluctuations and production failures caused by differences in manual operation, improves the standardization of production control, and can well match the production efficiency of the rolling line. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of a method for setting finishing rolling speed and strip steel parameters, which is one embodiment of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] On the one hand, such as Figure 1 As shown, this embodiment of the invention provides a method for setting the finishing rolling speed and strip steel parameters, including:

[0041] Step S10: When the head of the strip reaches the entrance of the finishing mill, the head temperature of the strip is detected, and the corresponding work plan parameters of the strip are obtained from the work plan.

[0042] Step S11: Based on the head temperature of the strip and the corresponding work plan parameters, query the strip speed and cooling water parameter table, match and obtain the target record item, and use the speed parameters and cooling water supply parameters corresponding to the target record item as the speed parameters and cooling water supply parameters of the strip during the finishing rolling process; wherein, the range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip, and the range of head temperature of the target record item includes the head temperature of the strip;

[0043] Step S12: Send the speed parameters and cooling water supply parameters of the strip during finishing rolling to the secondary model;

[0044] The secondary model is used to control the moving speed of the strip according to the speed parameters of the strip during the finishing rolling process, and at the same time control the cooling water supply according to the cooling water supply parameters of the strip during the finishing rolling process, so as to control the outlet temperature of the strip at the outlet of the finishing mill at the target required outlet temperature.

[0045] The strip speed and cooling water parameter table includes multiple record items; each record item includes the corresponding work plan parameter range, head temperature range, speed parameter, and cooling water supply parameter.

[0046] In some embodiments, the strip speed and cooling water parameter table includes multiple records of different head temperature ranges that match the work plan parameter ranges corresponding to the strip. All head temperature ranges corresponding to these records of different head temperature ranges do not overlap. The temperature range obtained by connecting all head temperature ranges of these records of different head temperature ranges in ascending order of temperature is equal to the inlet temperature variation range of the strip at the entrance of the finishing mill. The speed parameters corresponding to different records of different head temperature ranges that match the work plan parameter ranges corresponding to the strip may be the same or different. The cooling water supply parameters corresponding to different records of different head temperature ranges that match the work plan parameter ranges corresponding to the strip may be the same or different. The inlet temperature variation range of the strip at the entrance of the finishing mill is determined by the steel grade, finished product thickness, and finished product width of the strip produced in this batch, and is the maximum range of all possible head temperature values ​​of the strip reaching the entrance of the finishing mill in this batch of production. Based on historical production data, a strip speed and cooling water parameter table is created in advance, which includes statistically analyzed work plan parameters for the finishing rolling process of multiple strips, such as strip grade, finished product thickness, finished product width, head temperature, speed parameters, and cooling water supply parameters. The strip speed and cooling water parameter table uses the work plan parameter range and head temperature range as query matching conditions to retrieve the corresponding speed parameters and cooling water supply parameters. If the work plan parameters corresponding to the strip match the range or values ​​defined by the work plan parameter range, then the work plan parameters corresponding to the strip are considered to match the work plan parameter range of that record.The following example illustrates the process of continuous strip finishing rolling. Strips A, B, and C arrive at the finishing mill sequentially for rolling. When strip A is at the mill inlet, its head temperature is measured by a temperature measuring device at the inlet. The work plan parameters for strip A are retrieved from the work plan. Based on these parameters and head temperature, the strip speed and cooling water parameter tables are consulted to find a record 'a' that matches the work plan parameters for strip A. The head temperature of strip A is within the head temperature range T1 of record 'a'. The corresponding speed and cooling water supply parameters are then obtained, and the rolling of strip A is controlled in the secondary model based on these parameters. Next, strip B arrives at the mill inlet. Assuming that the work plan parameters for strip B are the same as those for strip A, and that the head temperature of strip B is similar to that of strip A (i.e., the head temperature of strip B changes only slightly relative to that of strip A), the head temperature of strip B at this point is... Still within the head temperature range T1, strip B will also select the speed and cooling water parameters corresponding to record item a. The effect is that when the head temperature changes slightly, the finishing mill production line does not adjust the cooling water supply parameters, but only controls the strip speed at different stages of the finishing process to control the strip exit temperature. Next, strip C arrives at the finishing mill inlet. Assuming the head temperature of strip C differs significantly from that of strip B, and the head temperature of strip C is within the head temperature range T2 (T1 and T2 do not overlap), strip C selects record item c, which matches the work plan parameters of strip C and has a head temperature range of T2. The speed and cooling water supply parameters of record item c can be different from those of record item a. Therefore, when the head temperature range at the inlet changes significantly, both the speed and cooling water supply parameters can be adjusted, thus avoiding the problem of large speed fluctuations affecting production line stability caused by simple speed adjustments. During production, the working plan parameters for strips rolled sequentially can differ. This can be achieved by matching the corresponding records in the strip speed and cooling water parameter tables based on the working plan parameters and head temperature. The secondary model in hot rolling production is the core system of the process control level (Level 2) in the steel industry's hot rolling production process, representing a crucial link in industrial automation. It optimizes and controls the hot rolling process in real time through mathematical models and algorithms, connecting basic automation (Level 1) with production management (Level 3), directly impacting product quality, production efficiency, and energy consumption optimization. The core functions of the hot rolling secondary model include, but are not limited to: 1. Setpoint calculation: Based on parameters such as the chemical composition and dimensions of the incoming material (slab), combined with process rules and mathematical models, it calculates key parameters such as rolling force, rolling speed, and temperature settings; and dynamically adjusts mill roll gaps and tension to ensure the stability and accuracy of the rolling process.2. Adaptive and self-learning models are used to correct model parameters based on real-time feedback data (such as actual rolling force and temperature deviation), reducing the error between theoretical and actual values; and to optimize process patterns in historical data using machine learning (such as neural networks). 3. Quality prediction and control are used to predict the mechanical properties (such as yield strength and elongation) and dimensional accuracy (thickness and shape) of rolled products; and to reduce quality fluctuations and scrap rates through closed-loop control. 4. Temperature models are used to precisely control the temperature profiles of rolled parts during roughing, finishing, and laminar cooling stages to ensure that microstructure and properties meet standards. Typical mathematical models and techniques include physical models for rolling force and heat transfer equations based on metallurgical principles (such as the Sims equation). Statistical models are used for regression analysis and data fitting (such as thickness deviation compensation). Intelligent algorithms are used for neural networks and fuzzy logic (for nonlinear problem optimization). A real-time database is used to store process parameters and historical data, supporting model iteration. The functions of the Level 2 model also include: 1. Data acquisition and processing, used for real-time interaction with Level 1 (sensors, PLC) to ensure low latency and high reliability of data, as well as filtering and compensating for abnormal data (such as removing sensor noise). 2. Model verification and calibration, used to periodically correct model parameters based on actual production data to avoid "model drift"; and to perform multi-scenario verification in combination with different steel grades and specifications. 3. System integration, used for interacting with MES (Level 3) for production planning, coordinating with Level 1 to execute control commands; and standardized interfaces (such as OPCUA) to ensure communication compatibility.

[0047] The embodiments of this invention have the following beneficial effects: By categorizing the temperature variation range of the strip at the inlet of the finishing mill, multiple head temperature ranges are obtained. Corresponding speed and cooling water supply parameters are set for different head temperature ranges, creating a widely adaptable, stable, and accurate strip speed and cooling water parameter table, thus improving the stability and accuracy of speed and cooling water parameter settings. When the strip begins finishing, the strip's work plan parameters and head temperature, obtained from the work plan, are used as search conditions to query the strip speed and cooling water parameter table, obtain the speed and cooling water supply parameters, and transmit them to the secondary model for control settings of this strip. This achieves automatic speed and cooling water setting control to ensure the finishing mill exit temperature meets the target exit temperature requirements. This achieves the purpose of speed and temperature control with small variations in the finishing mill inlet temperature and speed and temperature control with large variations in the finishing mill inlet temperature, which is beneficial to the calculation accuracy of the secondary model and the stability of the production rhythm. This invention innovatively introduces retrieval conditions such as graded ranges of finishing mill inlet temperature variation with almost zero cost investment, significantly improving the stability and accuracy of finishing mill speed and strip steel retrieval parameters. It can adapt to temperature and mode changes under various product specifications, achieving the purpose of speed and temperature control with small changes in finishing mill inlet temperature and water speed and temperature control with large changes in finishing mill inlet temperature. It avoids steel plate quality fluctuations and production failures caused by differences in manual operation, improves the standardization of production control, and can well match the production efficiency of the rolling line.

[0048] Preferably, the range of work plan parameters corresponding to each record item includes: the corresponding steel grade, the range of finished product thickness, and the range of finished product width;

[0049] The work plan parameters corresponding to the strip steel include the corresponding steel grade, finished product thickness, and finished product width;

[0050] The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, specifically including:

[0051] The steel grade in the work plan parameters corresponding to the strip is the same as the steel grade in the work plan parameter range corresponding to the target record item, and the finished product thickness in the work plan parameters corresponding to the strip is within the finished product thickness range in the work plan parameter range corresponding to the target record item, and the finished product width in the work plan parameters corresponding to the strip is within the finished product width range in the work plan parameter range corresponding to the target record item.

[0052] The finished product thickness range includes the range from the lower limit to the upper limit of the finished product thickness; the finished product width range includes the range from the lower limit to the upper limit of the finished product width.

[0053] The head temperature range corresponding to the recorded item includes the range from the corresponding lower limit of head temperature to the upper limit of head temperature.

[0054] Preferably, the range of work plan parameters corresponding to each record item also includes: the corresponding single / dual furnace mode and hot roll box commissioning mode;

[0055] The work plan parameters corresponding to the strip steel also include the corresponding single / double furnace mode and hot coil box commissioning mode.

[0056] The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, and also includes:

[0057] The single / double furnace mode in the work plan parameters corresponding to the strip steel is the same as the single / double furnace mode in the work plan parameter range corresponding to the target record item, and the hot coil box commissioning mode in the work plan parameters corresponding to the strip steel is the same as the hot coil box commissioning mode in the work plan parameter range corresponding to the target record item.

[0058] The distinction between single / dual furnace mode and hot coil box operation mode is increased to further improve the precision and accuracy of parameter setting, while avoiding mutual interference between parameter adjustments in different modes, thereby improving the speed and accuracy of strip steel setting parameters.

[0059] Preferably, the speed parameters include: a reference threading speed, a minimum threading speed, a maximum threading speed, a running speed, a throwing speed, a first acceleration, a second acceleration, and a throwing acceleration. Among them, the threading reference speed, the minimum threading speed, and the maximum threading speed are parameters used by the existing secondary model to calculate the actual threading speed. The actual threading speed is limited between the minimum and maximum threading speeds. The actual threading speed is the speed at which the strip head passes through the finishing mill. The running speed is the maximum speed reached by the strip head from the finishing mill exit. The strip throwing speed is the speed that the strip tail needs to reach when exiting the finishing mill. The first acceleration is the acceleration from the strip head exiting the finishing mill to the strip head reaching the coiling and tensioning stage. The second acceleration is the acceleration of the strip from the speed change after coiling and tensioning to the running speed. The strip throwing acceleration is the acceleration from the strip tail leaving the first finishing mill in the finishing mill group to the last finishing mill. After receiving the speed parameters, the secondary model will use the original strip speed control algorithm of the secondary model to control the speed changes in each stage of the finishing process (such as threading, running, coiling, and strip throwing stages).

[0060] Preferably, the cooling water supply parameters include: the strip cooling water supply switch status of the 2nd to N-1th finishing mills from upstream to downstream in the finishing mill group; wherein, the finishing mill group includes N finishing mills numbered 1 to N sequentially from upstream to downstream.

[0061] Table 1 is a specific example of a strip speed and cooling water parameter table, which includes relevant parameters for strip steel grade P24. For temperature grading, it covers the finishing mill inlet temperature range of 850-1150 degrees Celsius. Specifically, the search conditions include the work plan parameter range and head temperature range corresponding to the record item; the search result parameters include speed parameters and cooling water supply parameters; the work plan parameter range includes steel grade, finished product thickness range, finished product width range, single / double furnace mode, and hot coil box operation mode; the finished product thickness range includes the range from the lower limit to the upper limit of the finished product thickness; the finished product width range includes the range from the lower limit to the upper limit of the finished product width; the head temperature range includes... The upper limit of the head temperature (the upper limit of the inlet temperature in Table 1) and the lower limit of the head temperature (the lower limit of the inlet temperature in Table 1); the speed parameters include the strip threading reference speed, the minimum strip threading speed, the maximum strip threading speed, the running speed, the steel throwing speed, the first acceleration, the second acceleration, and the steel throwing acceleration; the finishing mill group corresponding to Table 1 is a 6-stand finishing mill, and the cooling water supply parameters in Table 1 include F2 strip molten steel (the strip cooling water supply switch status corresponding to the 2nd finishing mill), F3 strip molten steel (the strip cooling water supply switch status corresponding to the 3rd finishing mill), F4 strip molten steel (the strip cooling water supply switch status corresponding to the 4th finishing mill), and F5 strip molten steel (the strip cooling water supply switch status corresponding to the 5th finishing mill). In the table, a value of 2 indicates dual-furnace mode, and 1 indicates single-furnace mode; the hot coil box mode (hot coil box operation mode) is 1 indicating the hot coil box is in operation, and 0 indicating the hot coil box is not in operation; the temperature unit in the table is Celsius, and the thickness or width unit is millimeters; the strip cooling water supply switch status is 0 indicating that the corresponding finishing mill does not supply cooling water, and 1 indicating that the corresponding finishing mill supplies cooling water; the speed unit is meters per second; the acceleration unit is meters per second. 2 .

[0062]

[0063] Table 1 Strip speed and cooling water parameters

[0064] Furthermore, the temperature variation range of the strip head at the entrance of the finishing mill includes an abnormally low temperature range, a normal rolling temperature range, and an abnormally high temperature range.

[0065] In the strip speed and cooling water parameter table, for all record items that match the work plan parameters corresponding to the strip, the width of the head temperature range in the abnormal low temperature range is greater than the width of the head temperature range in the normal rolling temperature range, and the width of the head temperature range in the normal rolling temperature range is greater than the width of the head temperature range in the abnormal high temperature range.

[0066] The normal rolling temperature range is determined by the steel grade, finished product thickness, and finished product width of the work plan parameters corresponding to the strip; the abnormally low temperature range is the temperature range below the normal rolling temperature range within the range of inlet temperature variation; the abnormally high temperature range is the temperature range above the normal rolling temperature range within the range of inlet temperature variation; all records matching the work plan parameters corresponding to the strip are records that satisfy the requirement that the corresponding work plan parameter range includes the work plan parameters corresponding to the strip.

[0067] During the finishing rolling process, the strip steel arrives at the finishing mill sequentially. Different strips arriving at the mill have varying head temperatures, and the range of these head temperatures constitutes the inlet temperature range. The normal rolling temperature range, determined by the strip steel grade, finished thickness, and finished width, can be pre-calculated based on historical production data. A larger normal rolling temperature range is chosen primarily to allow for the use of a single strip steel molten metal parameter setting within the same temperature range under identical conditions. This achieves the goal of adjusting speed and temperature control for small variations in the finishing mill inlet temperature and adjusting water flow and speed control for large variations in the finishing mill inlet temperature, which is beneficial for the accuracy of the secondary model calculations and the stability of the production rhythm. When setting the range widths for the head temperature ranges corresponding to the abnormally low temperature range, the normal rolling temperature range, and the abnormally high temperature range, the main consideration is that the abnormally low temperature range is a temperature range where the strip head temperature rarely occurs. Therefore, a relatively large range width is set for the head temperature range to reduce the number of records that rarely appear in the strip speed and cooling water parameter tables during production, thereby reducing table size and improving table lookup efficiency. A slightly larger range width is set for the head temperature range in the normal rolling temperature range to avoid frequent changes in strip cooling water while also ensuring production rhythm stability. The abnormally high temperature range requires a large cooling range and different strip cooling water is needed with large parameter differences. Therefore, a smaller range width is set for the head temperature range to maintain sensitive adjustment of speed parameters and cooling water supply parameters.

[0068] Preferably, in the strip speed and cooling water parameter table, for all records matching the work plan parameters corresponding to the strip, the head temperature range has the following characteristics: the head temperature range width within the abnormally low temperature range is 46 to 55 degrees Celsius; the head temperature range width within the normal rolling temperature range is 35 to 45 degrees Celsius; and the head temperature range width within the abnormally high temperature range is 15 to 25 degrees Celsius. All records matching the work plan parameters corresponding to the strip are records whose corresponding work plan parameter range includes the work plan parameters corresponding to the strip.

[0069] Preferably, in the strip speed and cooling water parameter table, for all records matching the work plan parameters corresponding to the strip, the head temperature range has the following widths: 50 degrees Celsius in the abnormally low temperature range, 40 degrees Celsius in the normal rolling temperature range, and 20 degrees Celsius in the abnormally high temperature range; all records matching the work plan parameters corresponding to the strip are records whose corresponding work plan parameter range includes the work plan parameters corresponding to the strip.

[0070] Preferably, for hot-rolled strip steel with a thickness of 4 to 20 mm and a width of 1500 mm, the abnormal low temperature range is 850 to 970 degrees Celsius, the normal rolling temperature range is 970 to 1010 degrees Celsius, and the abnormal high temperature range is 1010 to 1150 degrees Celsius.

[0071] In some embodiments, the temperature grading design features cover the strip temperature range of 850-1150℃ at the finishing mill inlet, with a 50℃ span for abnormally low temperatures. Additionally, the normal rolling temperature range is divided into 40℃ spans based on different steel grades and sizes, and the remaining temperature ranges are divided into 20℃ spans. For example, the common grade Q235B, with a thickness x width of 4-20*1500mm, has a normal rolling temperature range of 970-1010℃, with temperature gradings of 850-900, 900-950, 950-970, 970-1010, 1010-1030, 1030-1050, and 1050-1150℃. The larger normal rolling temperature range is primarily intended to allow for the use of a single strip molten steel parameter setting within the same temperature range under identical conditions. This achieves the purpose of adjusting speed and temperature control with small variations in the finishing mill inlet temperature, and adjusting water flow and speed control with large variations in the finishing mill inlet temperature. This is beneficial for the accuracy of the secondary model calculations and the stability of the production rhythm.

[0072] Furthermore, when the hot coil box is not in use, the average temperature of the temperature data of the front strip of the strip from 1 / 3 to 2 / 3 of the length starting from the head of the strip is collected at the exit of the finishing mill.

[0073] The average temperature is compared with the target required exit temperature. If the average temperature is lower than the target required exit temperature, the running speed of the strip during the finishing rolling is accelerated. If the average temperature is higher than the target required exit temperature, the running speed of the strip during the finishing rolling is decelerated.

[0074] The speed parameters of the strip during finishing rolling include the running speed.

[0075] In some embodiments, the temperature deviation value obtained by subtracting the target required outlet temperature from the average temperature can be calculated. If the temperature deviation value is within one of a preset plurality of negative deviation ranges, the running speed of the strip during the finishing rolling is updated by adding the running speed of the strip during the finishing rolling to the speed correction value corresponding to the negative deviation range in which the temperature deviation value is located.

[0076] If the temperature deviation value is within one of a preset range of positive deviations, then the running speed of the strip during the finishing rolling is updated by subtracting the speed correction value corresponding to the positive deviation range in which the temperature deviation value is located from the running speed of the strip during the finishing rolling.

[0077] Wherein, the upper and lower limits of the negative deviation range are both negative values, and the upper and lower limits of the positive deviation range are both positive values; the speed correction value corresponding to the negative deviation range is positive; and the speed correction value corresponding to the positive deviation range is negative. Preferably, the speed correction value ranges from -0.2 to +0.2 m / s.

[0078] To address the issue of significant temperature fluctuations at the entry point of the finishing strip due to furnace heating in some cases, typically resulting in lower temperatures at the beginning and end and higher temperatures in the middle, leading to situations where the exit temperature is acceptable at the beginning but exceeds the middle, a self-learning function for the operating speed in the off-duty mode of the hot coil box has been added based on on-site production conditions. This function collects temperature data from the middle 1 / 3 length of the strip at the finishing strip exit and calculates the average temperature, i.e., the average temperature from the 1 / 3 to 2 / 3 position of the strip head. If the average temperature is lower than the target exit temperature by a certain range, the operating speed parameters are adjusted to accelerate compensation; if the average temperature is higher than the target exit temperature by a certain range, the operating speed parameters are adjusted to decelerate compensation. This achieves a certain degree of self-learning functionality. The temperature within the first 1 / 3 length of the strip head can be largely controlled by the threading speed, while the remaining portion is determined by the operating speed. If temperature data is collected over a very long length, too much data needs to be processed, increasing the data processing workload. Therefore, data from the middle 1 / 3 length of the strip is selected.

[0079] The embodiments of the present invention have the following technical effects: when continuously producing strip steel with the same parameters, the production process of subsequent strip steel can be dynamically optimized based on the production data of the previous strip steel, thereby realizing dynamic automatic optimization of the production process.

[0080] Further, the comparison of the average temperature with the target required exit temperature, wherein if the average temperature is lower than the target required exit temperature, the running speed of the strip during finishing rolling is accelerated; and if the average temperature is higher than the target required exit temperature, the running speed of the strip during finishing rolling is decelerated, including:

[0081] Calculate the temperature deviation between the average temperature and the target required outlet temperature;

[0082] Based on the temperature deviation value and the steel grade, finished product thickness and finished product width of the corresponding work plan parameters of the strip, query the running speed self-learning correction table, select the target correction record, and add the speed correction value in the target correction record to the running speed in the speed parameters of the strip during the finishing rolling. Use the result of the addition to update the running speed in the speed parameters of the strip during the finishing rolling.

[0083] The self-learning correction table for operating speed includes multiple correction records. Each correction record includes the corresponding steel grade, lower limit of finished product thickness, upper limit of finished product thickness, lower limit of finished product width, upper limit of finished product width, lower limit of temperature deviation value, upper limit of temperature deviation value, and speed correction value. The self-learning correction table for operating speed is pre-created by statistically analyzing historical production data. The lower limit and upper limit of temperature deviation value corresponding to the same correction record are both greater than zero or less than zero, and the positive and negative signs of the speed correction value corresponding to the same correction record are opposite to the positive and negative signs of the lower limit and upper limit of temperature deviation value.

[0084] The steel grade in the target correction record is the same as the steel grade in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the finished product thickness in the target correction record includes the finished product thickness in the work plan parameter corresponding to the strip steel, the range formed by the lower limit and upper limit of the finished product width in the target correction record includes the finished product width in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the temperature deviation value in the target correction record includes the temperature deviation value.

[0085] Preferably, in the self-learning correction table for running speed, the lower and upper limits of the temperature deviation values ​​of all correction records where both the lower and upper limits of the temperature deviation value are negative constitute a continuous negative temperature deviation range; the lower and upper limits of the temperature deviation values ​​of all correction records where both the lower and upper limits of the temperature deviation value are positive constitute a continuous positive temperature deviation range.

[0086] In some embodiments, a self-learning correction table for operating speed is constructed based on statistics of historical production data. The speed correction value is determined by looking up the table, making it easy to set corresponding correction records for complex changes in the strip steel work plan parameters during the production process. This enables rapid updating and iteration of the self-learning correction table for operating speed during production. Table 2 shows a specific embodiment of the self-learning correction table for operating speed.

[0087] P24 5.10 5.60 850 1,690 -50 -30 +0.2 P24 5.10 5.60 850 1,690 -30 -15 +0.1 P24 5.10 5.60 850 1,690 -15 -10 +0.05 P24 5.10 5.60 850 1,690 10 15 -0.05 P24 5.10 5.60 850 1,690 15 30 -0.1 P24 5.10 5.60 850 1,690 30 50 -0.2

[0088] Table 2. Running Speed ​​Self-Learning Correction Table

[0089] Furthermore, production data during the production process is collected, and the strip speed and cooling water parameter tables are updated based on the production data.

[0090] In some embodiments, continuously updating and iterating the strip speed and cooling water parameter tables based on production data is beneficial for continuously optimizing production process parameters and improving production efficiency and quality.

[0091] The technical solutions of the present invention will be described in detail below with reference to specific application examples. For technical details not described in the implementation process, please refer to the relevant descriptions above.

[0092] This invention belongs to the field of hot strip rolling technology. Specifically, it automatically matches reasonable finishing mill speed parameters and strip molten steel settings based on parameters such as finishing mill inlet temperature, single / double furnace operation mode, and hot coil box operation mode, thereby improving the stability and accuracy of automatic control of finishing mill speed and strip molten steel. This invention implements a method for setting finishing mill speed and strip molten steel parameters based on existing speed control settings. It basically achieves speed regulation and temperature control for small-amplitude incoming material temperature changes, and a control strategy of adjusting water flow and speed regulation for large-amplitude incoming material temperature changes. This ensures both the stability of finishing mill outlet temperature control and production rhythm. Simultaneously, it improves production standardization and avoids quality fluctuations and production failures caused by differences and instabilities in manual control.

[0093] This invention sets the speed and strip (cooling) water parameters according to the strip temperature at the finishing mill inlet, while also distinguishing between hot coil box operation modes and single / double furnace production modes. A set of speed setting and strip molten steel setting parameter tables is created, as shown in Appendix Table 1. The strip temperature at the finishing mill inlet is further subdivided, with each temperature level configured with basic subdivisions such as steel grade, material, width, and thickness. Finally, the speed parameters and strip molten steel parameters corresponding to each matching parameter are used for secondary model control calculations. The speed parameters are consistent with conventional speed parameter tables, including eight parameters: strip threading reference speed, minimum strip threading speed, maximum strip threading speed, running speed, tail-throwing speed, first acceleration, second acceleration, and tail-throwing acceleration. The strip molten steel parameters include four parameters: F2 strip molten steel, F3 strip molten steel, F4 strip molten steel, and F5 strip molten steel. A total of 12 parameters are transferred to the secondary model for setting the speed and strip molten steel for this strip block.

[0094] The temperature grading design covers the strip temperature range of 850-1150℃ at the finishing mill inlet. For abnormally low temperatures, a 50℃ range is provided. Additionally, the normal rolling temperature range is divided into 40℃ ranges based on different steel grades and dimensions, with other temperature ranges divided into 20℃ ranges. For example, the common grade Q235B, with a thickness x width of 4-20*1500mm, has a normal rolling temperature range of 970-1010℃, with temperature gradings of 850-900, 900-950, 950-970, 970-1010, 1010-1030, 1030-1050, and 1050-1150℃. The larger normal rolling temperature range is primarily to allow for the use of a single strip molten steel parameter setting within the same temperature range under identical conditions. This achieves speed control and temperature regulation with small variations in the finishing mill inlet temperature, and water flow and speed control with large variations in the finishing mill inlet temperature. This is beneficial for the accuracy of the secondary model calculations and the stability of the production rhythm.

[0095] The distinction between single / dual furnace mode and hot coil box operation mode is increased to further improve the precision and accuracy of parameter setting, while avoiding mutual interference between parameter adjustments in different modes, thereby improving the speed and accuracy of strip steel setting parameters.

[0096] The program is added so that after the head of each steel piece reaches the inlet high temperature gauge of the finishing mill and the temperature is collected, the program immediately searches the parameter table according to the inlet temperature, steel type, thickness and width, obtains the speed setting and strip molten steel setting parameters, and transmits them to the secondary model for the control setting of this steel piece, so as to realize the control of the finishing mill exit temperature by speed and strip molten steel setting in automatic mode.

[0097] In response to the large temperature fluctuations at the inlet of the finishing mill for the same piece of steel due to the heating of the furnace in some cases, with the common phenomenon of low temperature at the beginning and end and high temperature in the middle, the finishing mill outlet temperature may be qualified at the beginning but overheated in the middle. Based on the on-site production situation, a self-learning function for the running speed in the mode when the hot coil box is not in use is added. The temperature data of the middle 1 / 3 of the length of the finishing mill outlet of the previous piece of steel is collected and the average value is calculated. If the average value is lower than the target value by a certain range, the running speed parameter is accelerated and compensated. If the average value is higher than the target value by a certain range, the running speed parameter is decelerated and compensated, thus realizing a certain degree of self-learning function.

[0098] The parameter table is adjusted and maintained based on big data from on-site production. Precise parameters are set for different conditions. At the same time, the parameter table classification structure is optimized to take into account the changes in the target temperature of the finishing mill exit, and different target temperature specifications of the finishing mill exit should not be classified into the same category.

[0099] The embodiments of this invention have the following technical effects: These embodiments introduce search conditions such as finishing mill inlet temperature grading, single / dual furnace modes, and hot coil box operation modes, creating a set of widely adaptable, stable, and accurate speed and strip steel setting parameter tables. This improves the stability and accuracy of speed and strip steel parameter settings. Hot-rolled strips are typically 1.2 mm thickest and 28 mm thickest. Strips thinner than 1.2 mm are suitable for cold rolling, while strips thicker than 28 mm cannot be coiled. This invention is particularly suitable for hot-rolled finishing mills with thicknesses of 2-25 mm and widths of 850-2000 mm. The temperature grading design covers the finishing mill inlet temperature range of 850-1150℃, with a 50℃ span for abnormally low temperatures. Additionally, the normal rolling temperature range can be 40℃ depending on the steel grade and size, and the remaining temperature ranges are all 20℃ spans. The main consideration for the large temperature range of the conventional rolling mill is to use a single strip steel parameter setting within the same temperature range under the same conditions. This achieves speed control and temperature regulation under small variations in the finishing mill inlet temperature, and water flow control and speed regulation under large variations in the finishing mill inlet temperature. This is beneficial for the calculation accuracy of the secondary model and the stability of the production rhythm. Thickness and width are categorized in conjunction with changes in the finishing mill exit temperature target to ensure consistency of the finishing mill exit temperature target value within the same category, avoiding parameter setting conflicts caused by different target temperatures within the same category. An automatic indexing program is developed based on the parameter table structure. After the inlet temperature of each steel piece is collected by the high-temperature gauge at the finishing mill inlet, the program immediately searches the parameter table based on the inlet temperature, steel grade, thickness, and width to obtain the speed setting and strip steel setting parameters, and transmits them to the secondary model for the control setting of this steel piece. This achieves automatic speed and strip steel setting control of the finishing mill exit temperature. The system implements a self-learning function for operating speed. It collects temperature data from the middle third of the strip's exit point at the finishing mill and calculates the average value. If the average value is below the target value by a certain range, the operating speed parameters are adjusted for acceleration compensation; if the average value is above the target value by a certain range, the operating speed parameters are adjusted for deceleration compensation. The learning rules are shown in Appendix Table 2, with a maximum learning correction of ±0.2 m / s. The self-learning data is cleared after the current rolling schedule ends, achieving a certain degree of self-learning functionality. The speed and strip steel parameter tables allow for easy modification of search condition ranges and parameter values. Real-time matching and optimization adjustments are performed in conjunction with process and operating condition changes. This invention, with almost zero cost, innovatively introduces search conditions such as finishing mill inlet temperature ranges, single / dual furnace modes, and hot coil box operation modes, significantly improving the stability and accuracy of finishing mill speed and strip steel search parameters. It can adapt to temperature and mode changes under various product specifications, achieving the purpose of speed and temperature control with small changes in finishing mill inlet temperature and water flow adjustment with large changes in finishing mill inlet temperature.The embodiments of the present invention have shown stable test results on a certain hot-rolled 2032 line, with an utilization rate of over 80% (that is, the test has been completed for 80% of the types of steel coils that can be produced on the hot-rolled 2032 line). This avoids fluctuations in steel plate quality and production failures caused by differences in manual operation, and improves the standardization of production control while matching the production efficiency of the rolling line well.

[0100] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0101] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0102] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0103] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations falling within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is used in a manner similar to the term "including." Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0104] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for setting finishing rolling speed and strip steel parameters, characterized in that, include: The temperature variation range of the strip at the entrance of the finishing mill is divided into multiple head temperature ranges. Corresponding speed parameters and cooling water supply parameters are set for different head temperature ranges to obtain a strip speed and cooling water parameter table. The temperature range obtained by connecting all head temperature ranges from low to high is equal to the temperature variation range of the strip at the entrance of the finishing mill. The temperature variation range of the strip head at the entrance of the finishing mill includes the abnormally low temperature range, the normal rolling temperature range, and the abnormally high temperature range. In the strip speed and cooling water parameter table, for all record items that match the work plan parameters corresponding to the strip, the width of the head temperature range in the abnormal low temperature range is greater than the width of the head temperature range in the normal rolling temperature range, and the width of the head temperature range in the normal rolling temperature range is greater than the width of the head temperature range in the abnormal high temperature range. The normal rolling temperature range is determined by the steel grade, finished product thickness, and finished product width of the strip corresponding to the work plan parameters; the abnormally low temperature range is the temperature range below the normal rolling temperature range within the range of inlet temperature variation; the abnormally high temperature range is the temperature range above the normal rolling temperature range within the range of inlet temperature variation. In the strip speed and cooling water parameter table, for all records that match the work plan parameters corresponding to the strip, the head temperature range is 46 to 55 degrees Celsius in the abnormally low temperature range, 35 to 45 degrees Celsius in the normal rolling temperature range, and 15 to 25 degrees Celsius in the abnormally high temperature range. When the head of the strip reaches the entrance of the finishing mill, the head temperature of the strip is detected, and the corresponding work plan parameters of the strip are obtained from the work plan. Based on the head temperature of the strip and the corresponding work plan parameters, the strip speed and cooling water parameter table is queried to obtain the target record item. The speed parameters and cooling water supply parameters corresponding to the target record item are used as the speed parameters and cooling water supply parameters of the strip during the finishing rolling process. The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip, and the range of head temperature of the target record item includes the head temperature of the strip. The speed parameters and cooling water supply parameters of the strip during finishing rolling are sent to the secondary model; The secondary model is used to control the moving speed of the strip during the finishing rolling process based on the speed parameters of the strip during the finishing rolling process, and simultaneously control the cooling water supply based on the cooling water supply parameters of the strip during the finishing rolling process, so as to control the outlet temperature of the strip at the outlet of the finishing mill to the target required outlet temperature; the strip speed and cooling water parameter table includes multiple record items; each record item includes the corresponding work plan parameter range, head temperature range, speed parameter and cooling water supply parameter.

2. The method for setting the finishing rolling speed and strip steel parameters as described in claim 1, characterized in that, The work plan parameter range for each record item includes: the corresponding steel grade, finished product thickness range, and finished product width range; The work plan parameters corresponding to the strip steel include the corresponding steel grade, finished product thickness, and finished product width; The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, specifically including: The steel grade in the work plan parameters corresponding to the strip is the same as the steel grade in the work plan parameter range corresponding to the target record item, and the finished product thickness in the work plan parameters corresponding to the strip is within the finished product thickness range in the work plan parameter range corresponding to the target record item, and the finished product width in the work plan parameters corresponding to the strip is within the finished product width range in the work plan parameter range corresponding to the target record item.

3. The method for setting the finishing rolling speed and strip steel parameters as described in claim 2, characterized in that, The range of work plan parameters for each record item also includes: the corresponding single / dual furnace mode and hot roll box commissioning mode; The work plan parameters corresponding to the strip steel also include the corresponding single / double furnace mode and hot coil box commissioning mode. The range of work plan parameters corresponding to the target record item includes the work plan parameters corresponding to the strip steel, and also includes: The single / double furnace mode in the work plan parameters corresponding to the strip steel is the same as the single / double furnace mode in the work plan parameter range corresponding to the target record item, and the hot coil box commissioning mode in the work plan parameters corresponding to the strip steel is the same as the hot coil box commissioning mode in the work plan parameter range corresponding to the target record item.

4. The method for setting the finishing rolling speed and strip steel parameters as described in claim 1, characterized in that, The speed parameters include: threading reference speed, threading minimum speed, threading maximum speed, running speed, steel throwing speed, first acceleration, second acceleration, and steel throwing acceleration.

5. The method for setting the finishing rolling speed and strip steel parameters as described in claim 1, characterized in that, The cooling water supply parameters include: the strip cooling water supply switch status of the 2nd to N-1th finishing mills from upstream to downstream in the finishing mill group; wherein, the finishing mill group includes N finishing mills numbered 1 to N from upstream to downstream.

6. The method for setting the finishing rolling speed and strip steel parameters as described in claim 3, characterized in that, When the hot coil box is not in use, the average temperature of the temperature data of the front strip of the strip from 1 / 3 to 2 / 3 of the length starting from the head of the strip is collected at the exit of the finishing mill. The average temperature is compared with the target required exit temperature. If the average temperature is lower than the target required exit temperature, the running speed of the strip during the finishing rolling is accelerated. If the average temperature is higher than the target required exit temperature, the running speed of the strip during the finishing rolling is decelerated. The speed parameters of the strip during finishing rolling include the running speed.

7. The method for setting the finishing rolling speed and strip steel parameters as described in claim 6, characterized in that, The process involves comparing the average temperature with the target required exit temperature. If the average temperature is lower than the target required exit temperature, the running speed of the strip during finishing rolling is accelerated; if the average temperature is higher than the target required exit temperature, the running speed of the strip during finishing rolling is decelerated. This includes: Calculate the temperature deviation between the average temperature and the target required outlet temperature; Based on the temperature deviation value and the steel grade, finished product thickness and finished product width of the corresponding work plan parameters of the strip, query the running speed self-learning correction table, select the target correction record, and add the speed correction value in the target correction record to the running speed in the speed parameters of the strip during the finishing rolling. Use the result of the addition to update the running speed in the speed parameters of the strip during the finishing rolling. The self-learning correction table for operating speed includes multiple correction records. Each correction record includes the corresponding steel grade, lower limit of finished product thickness, upper limit of finished product thickness, lower limit of finished product width, upper limit of finished product width, lower limit of temperature deviation value, upper limit of temperature deviation value, and speed correction value. The self-learning correction table for operating speed is pre-created by statistically analyzing historical production data. The lower limit and upper limit of temperature deviation value corresponding to the same correction record are both greater than zero or less than zero, and the positive and negative signs of the speed correction value corresponding to the same correction record are opposite to the positive and negative signs of the lower limit and upper limit of temperature deviation value. The steel grade in the target correction record is the same as the steel grade in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the finished product thickness in the target correction record includes the finished product thickness in the work plan parameter corresponding to the strip steel, the range formed by the lower limit and upper limit of the finished product width in the target correction record includes the finished product width in the work plan parameter corresponding to the strip steel, and the range formed by the lower limit and upper limit of the temperature deviation value in the target correction record includes the temperature deviation value.

8. The method for setting the finishing rolling speed and strip steel parameters as described in claim 1, characterized in that, Collect production data during the production process, and update the strip speed and cooling water parameter tables based on the production data.

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