Finish rolling speed and strip steel parameter setting method

Abstract

The embodiment of the invention provides a finish rolling speed and strip steel parameter setting method which comprises the following steps: when the head of strip steel reaches an inlet of a finish rolling unit, detecting the head temperature of the strip steel, and obtaining strip steel working plan parameters corresponding to the strip steel from a working plan; according to the head temperature of the strip steel and the corresponding work plan parameters, a strip steel speed and cooling water parameter table is inquired, a target record item is obtained through matching, and a speed parameter and a cooling water supply parameter corresponding to the target record item serve as a speed parameter and a cooling water supply parameter of the strip steel in the finish rolling period; and the speed parameter and the cooling water supply parameter of the strip steel in the finish rolling period are sent to the secondary model.

Description

Technical Field

[0001] The invention relates to the technical field of hot continuous rolling steel, and in particular to a method for setting finishing rolling speed and strip steel water parameters. Background Art

[0002] During the hot rolling production process, the finishing mill needs to control the finishing outlet 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 inlet temperature to control the finishing outlet temperature to hit the target. (2) Fixing the strip cooling water output, adjusting the strip moving speed, using a fixed strip cooling water output, adjusting the strip moving speed according to the finishing inlet temperature, and controlling the finishing outlet temperature to hit the target. The inventors found that frequent water adjustment at a fixed speed will affect the thickness setting, while fixed water speed regulation will cause large changes in the strip speed when the strip inlet temperature changes greatly, disrupting the production rhythm.

[0003] In the process of implementing the present invention, the applicant discovered that there are at least the following problems in the prior art:

[0004] In finishing rolling, simply adjusting the coil moving speed or the cooling water output cannot take into account both the target thickness of the coil and the production rhythm. Summary of the invention

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

[0006] To achieve the above-mentioned purpose, on the one hand, an embodiment of the present invention provides a method for setting finishing rolling speed and strip steel liquid parameters, comprising:

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

[0008] According to the head temperature of the steel strip and the corresponding work plan parameters, query the speed and cooling water parameter table of the steel strip, match and obtain the target record item, and use the speed parameter and cooling water supply parameter corresponding to the target record item as the speed parameter and cooling water supply parameter of the steel strip during the finishing rolling; wherein the work plan parameter range corresponding to the target record item includes the work plan parameter corresponding to the steel strip and the head temperature range of the target record item includes the head temperature of the steel strip;

[0009] sending speed parameters and cooling water supply parameters of the steel strip during finish rolling to the secondary model;

[0010] The secondary model is used to control the moving speed of the steel strip according to the speed parameter of the steel strip during the finishing rolling, and control the cooling water supply amount according to the cooling water supply parameter of the steel strip during the finishing rolling, so as to control the outlet temperature of the steel strip at the outlet of the finishing mill group to 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, a head temperature range, a speed parameter, and a cooling water supply parameter; the strip speed and cooling water parameter table includes multiple work plan parameter ranges that match the work plan parameters corresponding to the strip and record items with different head temperature ranges; the multiple work plan parameter ranges match the work plan parameters corresponding to the strip and all head temperature ranges corresponding to the record items with different head temperature ranges do not overlap with each other, and the temperature range obtained by connecting the multiple work plan parameter ranges that match the work plan parameters corresponding to the strip and all head temperature ranges corresponding to the record items with different head temperature ranges from low to high is equal to the inlet temperature variation range of the strip at the inlet of the finishing mill; the work plan parameter range matches the work plan parameter corresponding to the strip and the speed parameters corresponding to different record items with different head temperature ranges are the same or different; the work plan parameter range matches the work plan parameter corresponding to the strip and the cooling water supply parameters corresponding to different record items with different head temperature ranges are the same or different.

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

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

[0014] The work plan parameter range 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 work plan parameter range corresponding to each record item also includes: corresponding single and double furnace modes and hot coil box commissioning modes;

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

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

[0019] The single and double furnace modes in the work plan parameters corresponding to the strip are the same as the single and double furnace modes 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 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: a reference speed for threading, a minimum speed for threading, a maximum speed for threading, a running speed, a steel throwing speed, a first acceleration, a second acceleration and a steel throwing acceleration.

[0021] Furthermore, the cooling water supply parameters include: the strip cooling water supply switch status corresponding to the 2nd to N-1 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 inlet temperature variation range of the head of the strip at the inlet of the finishing mill group 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 the head temperature ranges corresponding to all record items matching the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is greater than the interval width of the head temperature range in the normal rolling temperature interval, and the interval width of the head temperature range in the normal rolling temperature interval is greater than the interval width of the head temperature range in the abnormally high temperature interval;

[0024] Among them, 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 a temperature range lower than the normal rolling temperature range within the inlet temperature variation range; the abnormally high temperature range is a temperature range higher than the normal rolling temperature range within the inlet temperature variation range; all record items that match the work plan parameters corresponding to the strip are record items that meet the corresponding work plan parameter range and include the work plan parameters corresponding to the strip.

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

[0026] Furthermore, in the strip speed and cooling water parameter table, for the head temperature range of all record items that match the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is 46 to 55 degrees Celsius, the interval width of the head temperature range in the normal rolling temperature interval is 35 to 45 degrees Celsius, and the interval width of the head temperature range in the abnormally high temperature interval is 15 to 25 degrees Celsius; all record items that match the work plan parameters corresponding to the strip are record items that satisfy the corresponding work plan parameter range and include the work plan parameters corresponding to the strip.

[0027] Further, when the hot coil box operation mode is that the hot coil box is not in operation, the temperature average value of the temperature data of the front strip of the strip from the 1 / 3 to 2 / 3 length position of the strip head at the exit of the finishing mill group is collected;

[0028] Comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling;

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

[0030] Further, the comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, and if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, comprises:

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

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

[0033] Wherein, the running speed self-learning correction table includes a plurality of correction records; each correction record includes the corresponding steel grade, finished product thickness lower limit, finished product thickness upper limit, finished product width lower limit, finished product width upper limit, temperature deviation value lower limit, temperature deviation value upper limit and speed correction value; the running speed self-learning correction table is created in advance by statistically analyzing historical production data; the temperature deviation value lower limit and temperature deviation value upper limit 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 temperature deviation value lower limit and the temperature deviation value upper limit;

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

[0035] Furthermore, production data in the production process is collected, and the strip speed and cooling water parameter table is updated according to the production data.

[0036] The above technical scheme has the following beneficial effects: the inlet temperature variation range of the strip steel at the inlet of the finishing mill is graded to obtain multiple head temperature ranges, and corresponding speed parameters and cooling water supply parameters are set for different head temperature ranges, to create a set of widely adaptable, stable and accurate strip steel speed and cooling water parameter tables, to improve the stability and accuracy of speed and strip steel water parameter settings; when the strip steel starts finishing rolling, the work plan parameters corresponding to the strip steel obtained from the work plan and the head temperature of the strip steel are used as search conditions, the strip steel speed and cooling water parameter table is queried, the speed parameters and cooling water supply parameters are obtained and transferred to the secondary model for the control setting of this strip steel, and the speed and strip steel water settings in the automatic state are realized to control the finishing outlet temperature to meet the target required outlet temperature. The purpose of speed control and temperature control when the finishing inlet temperature changes slightly and water control and speed control and temperature control when the finishing inlet temperature changes significantly is achieved, which is conducive to the calculation accuracy of the secondary model and the stability of the production rhythm. With almost zero cost investment, the embodiment of the present invention innovatively introduces retrieval conditions such as the grading range of the finishing rolling entrance temperature change, which greatly improves the stability and accuracy of the finishing rolling speed and strip steel liquid retrieval parameters, can adapt to temperature changes and mode changes under various product specifications, and achieve the purpose of speed and temperature control with small changes in the finishing rolling entrance temperature and water and speed and temperature control with large changes in the finishing rolling entrance temperature, avoids steel plate quality fluctuations and production failures caused by differences in manual operations, improves production control standardization, and can well match the rolling line production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The present invention is a flowchart of a method for setting finishing rolling speed and strip steel liquid parameters according to one embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0040] On the one hand, if Figure 1 As shown, an embodiment of the present invention provides a method for setting finishing rolling speed and strip steel liquid parameters, comprising:

[0041] Step S10, when the head of the steel strip reaches the entrance of the finishing mill, the head temperature of the steel strip is detected, and the work plan parameters corresponding to the steel strip are obtained from the work plan;

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

[0043] Step S12, sending the speed parameter and cooling water supply parameter of the steel strip during finish rolling to the secondary model;

[0044] The secondary model is used to control the moving speed of the steel strip according to the speed parameter of the steel strip during the finishing rolling, and control the cooling water supply amount according to the cooling water supply parameter of the steel strip during the finishing rolling, so as to control the outlet temperature of the steel strip at the outlet of the finishing mill group to the target required outlet temperature;

[0045] 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.

[0046] In some embodiments, 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 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 with each other; the temperature range obtained by connecting the multiple work plan parameter ranges that 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 work plan parameter range matches the work plan parameters corresponding to the strip and the speed parameters corresponding to different record items of different head temperature ranges are the same or different; the work plan parameter range matches the work plan parameters corresponding to the strip and the cooling water supply parameters corresponding to different record items of different head temperature ranges are the same or different. The inlet temperature variation range of the strip at the entrance of the finishing mill is determined by the steel type, finished product thickness and finished product width of the strip produced in the batch, and is the maximum range of all possible temperature values ​​of the head temperature of the strip arriving at the entrance of the finishing mill in the batch production. The strip speed and cooling water parameter table is created in advance based on the statistics of work plan parameters in the finishing rolling process of multiple strips in the historical production process, such as the steel grade, finished product thickness, finished product width, head temperature, speed parameter, cooling water supply parameter, etc. The strip speed and cooling water parameter table uses the work plan parameter range and head temperature range as query matching conditions to obtain the corresponding speed parameter and cooling water supply parameter; if the work plan parameter corresponding to the strip meets the range or value defined by the work plan parameter range, it is considered that the work plan parameter corresponding to the strip matches the work plan parameter range of the record item.The following example illustrates that during the continuous finishing rolling of the strip, strips A, B and C arrive at the finishing mill in sequence for rolling; when strip A is at the entrance of the finishing mill, the head temperature of strip A is obtained by the temperature measuring device at the entrance of the finishing mill, and the working plan parameters of strip A are obtained from the working plan. According to the working plan parameters and the head temperature of strip A, the strip speed and cooling water parameter table is queried, and the record item a matching the working plan parameters of strip A is matched and the head temperature of strip A is within the head temperature range T1 of the record item a, thereby obtaining the speed parameters and cooling water supply parameters corresponding to the record item a, and controlling the rolling of strip A according to the speed parameters and cooling water parameters in the secondary model; immediately after strip B arrives at the entrance of the finishing mill, assuming that the working plan parameters of strip B are the same as those of strip A, and the head temperature of strip B is close to the head temperature of strip A, that is, the head temperature of strip B relative to that of strip A only changes slightly, and at this time the head temperature of strip B It is still within the head temperature range T1, so strip B will also select the speed parameters 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, and only controls the strip speed at different stages of the finishing rolling process by the speed parameters to control the strip outlet temperature; immediately after strip C arrives at the entrance of the finishing mill, assuming that the head temperature of strip C is significantly different from the head temperature of strip B, the head temperature of strip C is within the head temperature range T2, and the head temperature ranges T1 and T2 do not overlap. Strip C selects record item c that matches the work plan parameters of strip C and has a head temperature range of T2. The speed parameters and cooling water supply parameters of record item c can be different from the speed parameters and cooling water supply parameters of record item a, so that when the head temperature range at the entrance changes significantly, both the speed parameters and the cooling water supply parameters can be adjusted, thereby avoiding the problem of large production line speed fluctuations caused by simple speed regulation affecting the stability of the production line. During the production process, the work plan parameters between the strips rolled in sequence can also be different. It is only necessary to match the corresponding record items in the strip speed and cooling water parameter table according to the work plan parameters and the head temperature to obtain the corresponding speed parameters and cooling water supply parameters. The secondary model in hot rolling production is the core system of the process control level (Level 2) in the hot rolling production process of the steel industry, and is a key link in the industrial automation level. It optimizes and controls the hot rolling process in real time through mathematical models and algorithms, connects basic automation (Level 1) with production management (Level 3), and directly affects product quality, production efficiency and energy consumption optimization. The core functions of the hot rolling secondary model include but are not limited to: 1. Set value calculation, which is used to calculate the key parameters such as rolling force, rolling speed, temperature setting, etc. according to the chemical composition, size specifications and other parameters of the incoming material (slab), combined with process rules and mathematical models; and dynamically adjust the mill roll gap, tension, etc. to ensure the stability and accuracy of the rolling process.2. Self-adaptation and self-learning, used to correct model parameters through real-time feedback data (such as actual rolling force, temperature deviation) to reduce the error between theoretical and actual values; and use machine learning (such as neural network) to optimize the process rules in historical data. 3. Quality prediction and control, used to predict the mechanical properties (such as yield strength, elongation) and dimensional accuracy (thickness, plate shape) of rolled products; and reduce quality fluctuations and scrap rates through closed-loop control. 4. Temperature model, used to accurately control the temperature curve of rolled products in the stages of rough rolling, finishing rolling, laminar cooling, etc., to ensure that the organizational performance meets the standards. And typical mathematical models and technologies such as physical models, used for rolling force and heat transfer equations based on metallurgical principles (such as Sims formula). Statistical models, used for regression analysis and data fitting (such as thickness deviation compensation). Intelligent algorithms, used for neural networks and fuzzy logic (for nonlinear problem optimization). Real-time database, used to store process parameters, historical data, and support model iteration. The functions of the secondary model also include: 1. Data acquisition and processing, which is used for real-time interaction with Level 1 (sensors, PLCs) to ensure low data latency, high reliability, and abnormal data filtering and compensation (such as eliminating sensor noise). 2. Model verification and calibration, which is used to regularly correct model parameters through actual production data to avoid "model drift"; and to conduct multi-scenario verification in combination with different steel grades and specifications. 3. System integration, which is used to interact with MES (Level 3) for production planning and to coordinate the execution of control instructions with Level 1; and standardized interfaces (such as OPC UA) to ensure communication compatibility.

[0047] The embodiment of the present invention has the following beneficial effects: the inlet temperature variation range of the strip steel at the inlet of the finishing mill during finishing rolling is graded to obtain multiple head temperature ranges, and corresponding speed parameters and cooling water supply parameters are set for different head temperature ranges, to create a set of widely adaptable, stable and accurate strip steel speed and cooling water parameter tables, to improve the stability and accuracy of speed and strip steel water parameter settings; when the strip steel starts finishing rolling, the work plan parameters of the strip steel obtained from the work plan and the head temperature of the strip steel are used as search conditions, the strip steel speed and cooling water parameter table is queried, the speed parameters and cooling water supply parameters are obtained and transmitted to the secondary model for the control setting of the strip steel, and the speed and cooling water supply parameters are set in the automatic state to control the finishing outlet temperature to meet the target required outlet temperature. The purpose of speed control and temperature control when the finishing inlet temperature changes slightly and water control and speed control and temperature control when the finishing inlet temperature changes significantly is achieved, which is beneficial to the calculation accuracy of the secondary model and the stability of the production rhythm. With almost zero cost investment, the embodiment of the present invention innovatively introduces retrieval conditions such as the grading range of the finishing rolling entrance temperature change, which greatly improves the stability and accuracy of the finishing rolling speed and strip steel liquid retrieval parameters, can adapt to temperature changes and mode changes under various product specifications, and achieve the purpose of speed and temperature control with small changes in the finishing rolling entrance temperature and water and speed and temperature control with large changes in the finishing rolling entrance temperature, avoids steel plate quality fluctuations and production failures caused by differences in manual operations, improves production control standardization, and can well match the rolling line production efficiency.

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

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

[0050] The work plan parameter range 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 parameter 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 parameter 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 parameter corresponding to the strip is within the finished product width range in the work plan parameter range corresponding to the target record item;

[0052] Among them, the finished product thickness range includes: the range from the lower limit of the finished product thickness to the upper limit of the finished product thickness; the finished product width range includes the range from the lower limit of the finished product width to the upper limit of the finished product width;

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

[0054] Preferably, the work plan parameter range corresponding to each record item also includes: corresponding single and double furnace modes and hot coil box commissioning modes;

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

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

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

[0058] Add a distinction between single and double furnace modes and hot coil box operation modes to further improve the precision and accuracy of parameter setting, while avoiding mutual influence of parameter debugging in different modes, and improving the speed and accuracy of strip steel molten steel setting parameters.

[0059] Preferably, the speed parameters include: a reference speed for threading, a minimum speed for threading, a maximum speed for threading, a running speed, a steel throwing speed, a first acceleration, a second acceleration and a steel throwing acceleration. Among them, the threading reference speed, the minimum threading speed and the maximum threading speed are the parameters used by the existing secondary model to calculate the actual threading speed, and the actual threading speed is limited between the minimum threading speed and the maximum threading speed; the actual threading speed is the speed at which the head of the strip passes through the finishing mill group, the running speed is the maximum speed at which the head of the strip accelerates from the time it leaves the finishing mill, the throwing speed is the speed that the tail of the strip needs to reach when it leaves the finishing mill, the first acceleration is the acceleration from the time the head of the strip leaves the finishing mill to the time the head of the strip reaches 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 throwing acceleration is the acceleration from the time the tail of the strip leaves 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 of each stage in the finishing rolling process (such as threading, running, curling, throwing, etc.).

[0060] Preferably, the cooling water supply parameters include: the strip cooling water supply switch status corresponding to the 2nd to N-1 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.

[0061] Table 1 is a specific embodiment of a strip speed and cooling water parameter table, which includes relevant parameters of a strip of steel grade P24. For the design of temperature grading, the finishing inlet temperature ranges from 850 to 1150 degrees Celsius. Specifically, the search conditions include the work plan parameter range and the head temperature range corresponding to the record item; the search result parameters include the speed parameter and the cooling water supply parameter; the work plan parameter range includes the steel grade, the finished product thickness range, the finished product width range, the single and double furnace mode, and the hot coil box commissioning mode; the finished product thickness range includes: the range from the lower limit of the finished product thickness to the upper limit of the finished product thickness; the finished product width range includes the range from the lower limit of the finished product width to the upper limit of the finished product width; the head temperature range includes The upper limit of head temperature (the upper limit of inlet temperature in Table 1) and the lower limit of head temperature (the lower limit of inlet temperature in Table 1); 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; the corresponding finishing mill group in Table 1 is 6 finishing mills, and the cooling water supply parameters in Table 1 include F2 strip steel water (the strip steel cooling water supply switch status corresponding to the second finishing mill), F3 strip steel water (the strip steel cooling water supply switch status corresponding to the third finishing mill), F4 strip steel water (the strip steel cooling water supply switch status corresponding to the fourth finishing mill), and F5 strip steel water (the strip steel cooling water supply switch status corresponding to the fifth finishing mill). The single and double furnace mode value in the table is 2 for double furnace mode, and 1 for single furnace mode; the hot coil box mode (hot coil box operation mode) is 1 for hot coil box operation, and 0 for hot coil box non-operation; the temperature unit in the table is Celsius, the thickness or width unit in the table is millimeter, the strip cooling water supply switch state is 0 for the corresponding finishing mill not supplying cooling water, and 1 for the corresponding finishing mill supplying cooling water; the speed unit is meter / second; the acceleration unit is meter / second 2 .

[0062]

[0063] Table 1 Strip speed and cooling water parameters

[0064] Furthermore, the inlet temperature variation range of the head of the strip at the inlet of the finishing mill group 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 the head temperature ranges corresponding to all record items matching the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is greater than the interval width of the head temperature range in the normal rolling temperature interval, and the interval width of the head temperature range in the normal rolling temperature interval is greater than the interval width of the head temperature range in the abnormally high temperature interval;

[0066] Among them, 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 a temperature range lower than the normal rolling temperature range within the inlet temperature variation range; the abnormally high temperature range is a temperature range higher than the normal rolling temperature range within the inlet temperature variation range; all record items that match the work plan parameters corresponding to the strip are record items that meet the corresponding work plan parameter range and include the work plan parameters corresponding to the strip.

[0067] During the finishing process, the strip arrives at the finishing mill in turn. There are differences in the head temperatures of different strips arriving at the finishing mill. The range of head temperatures of different strips arriving at the finishing mill constitutes the inlet temperature variation range. The normal rolling temperature range determined by the steel grade, finished product thickness and finished product width of the strip can be obtained in advance based on historical production data statistics. The normal rolling temperature range is based on a larger temperature range, mainly considering the use of a strip steel water parameter setting in the same temperature range under the same conditions, so as to achieve the purpose of speed control and temperature control with a small change in the finishing inlet temperature and water control and speed control with a large change in the finishing inlet temperature, which is conducive to the calculation accuracy of the secondary model and the stability of the production rhythm. When setting the interval widths of the head temperature ranges corresponding to the abnormally low temperature interval, the normal rolling temperature interval and the abnormally high temperature interval, it is mainly considered that the abnormally low temperature interval is a temperature range in which the strip head temperature rarely appears. A relatively large interval width of the head temperature range is set to reduce the record items that rarely appear in the production process in the strip speed and cooling water parameter tables, reduce the table size, and improve the table lookup efficiency; a slightly larger interval width of the head temperature range is set for the normal rolling temperature interval to avoid frequent changes in the strip cooling water while taking into account the stability of the production rhythm; the abnormally high temperature interval requires a large cooling amplitude, and different strip cooling water needs to be set, and the parameters are greatly different. It is necessary to set a small interval width of the head temperature range to maintain sensitive adjustment of the speed parameters and cooling water supply parameters.

[0068] Preferably, in the strip speed and cooling water parameter table, for the head temperature range of all record items matching the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is 46 to 55 degrees Celsius, the interval width of the head temperature range in the normal rolling temperature interval is 35 to 45 degrees Celsius, and the interval width of the head temperature range in the abnormally high temperature interval is 15 to 25 degrees Celsius; all record items matching the work plan parameters corresponding to the strip are record items that satisfy the corresponding work plan parameter range and include the work plan parameters corresponding to the strip.

[0069] Preferably, in the strip speed and cooling water parameter table, for the head temperature range of all record items that match the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is 50 degrees Celsius, the interval width of the head temperature range in the normal rolling temperature interval is 40 degrees Celsius, and the interval width of the head temperature range in the abnormally high temperature interval is 20 degrees Celsius; all record items that match the work plan parameters corresponding to the strip are record items that satisfy the corresponding work plan parameter range and include the work plan parameters corresponding to the strip.

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

[0071] In some embodiments, the design features of temperature grading include a range of 850-1150°C for the strip temperature at the entrance of the finishing mill, a span of 50°C for abnormally low temperatures, and a span of 40°C for the normal rolling temperature range according to different steel types and sizes, and a span of 20°C for the remaining temperature ranges. For example, the common grade Q235B has a thickness x width of 4-20*1500mm (mm) and a normal rolling temperature range of 970-1010°C, and the temperature grading is 850-900, 900-950, 950-970, 970-1010, 1010-1030, 1030-1050, and 1050-1150. The normal rolling temperature range is based on a larger temperature range, mainly considering the use of a strip steel water parameter setting in the same temperature range under the same conditions, so as to achieve the purpose of speed control and temperature control with a small change in the finishing rolling entrance temperature and water control and speed control with a large change in the finishing rolling entrance temperature, which is conducive to the calculation accuracy of the secondary model and the stability of the production rhythm.

[0072] Further, when the hot coil box operation mode is that the hot coil box is not in operation, the temperature average value of the temperature data of the front strip of the strip from the 1 / 3 to 2 / 3 length position of the strip head at the exit of the finishing mill group is collected;

[0073] Comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling;

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

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

[0076] If the temperature deviation value is within one of a plurality of preset positive deviation ranges, the running speed in the speed parameter of the steel 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 in the speed parameter of the steel strip during the finishing rolling;

[0077] 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 a positive value; and the speed correction value corresponding to the positive deviation range is a negative value. Preferably, the speed correction value ranges from -0.2 to positive 0.2 m / s.

[0078] In view of the fact that in some cases the inlet temperature of the same piece of steel at the finishing rolling entrance fluctuates greatly due to the heating of the heating furnace, and the common temperature at the head and tail is low and the middle temperature is high, the outlet temperature of the finishing rolling may be qualified at the head but over-temperature in the middle, the self-learning function of the running speed in the non-use mode of the hot coil box is increased according to the on-site production situation, and the temperature data of the middle 1 / 3 length of the finishing rolling outlet of the previous piece of steel is collected to calculate the temperature average value, that is, the temperature average value in the range from 1 / 3 position to 2 / 3 position starting from the head of the strip. If the temperature average value is lower than the target required outlet temperature within a certain range, the running speed parameters are accelerated and compensated. If the temperature average value is higher than the target required outlet temperature within a certain range, the running speed parameters are decelerated and compensated to achieve a certain degree of self-learning function. The temperature within 1 / 3 length starting from the head of the strip can be basically controlled by the threading speed, and the rest is determined by the running speed. If the temperature data of too long a length range is detected, too much data needs to be processed, which increases the data processing volume. Therefore, the data within the 1 / 3 length range of the middle of the strip is selected.

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

[0080] Further, the comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, and if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, comprises:

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

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

[0083] Wherein, the running speed self-learning correction table includes a plurality of correction records; each correction record includes the corresponding steel grade, finished product thickness lower limit, finished product thickness upper limit, finished product width lower limit, finished product width upper limit, temperature deviation value lower limit, temperature deviation value upper limit and speed correction value; the running speed self-learning correction table is created in advance by statistically analyzing historical production data; the temperature deviation value lower limit and temperature deviation value upper limit 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 temperature deviation value lower limit and the temperature deviation value upper limit;

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

[0085] Preferably, in the operating speed self-learning correction table, the lower limit of the temperature deviation value and the upper limit of the temperature deviation value of all correction records whose lower limit of the temperature deviation value and the upper limit of the temperature deviation value are both negative constitute a continuous negative temperature deviation interval; the lower limit of the temperature deviation value and the upper limit of the temperature deviation value of all correction records whose lower limit of the temperature deviation value and the upper limit of the temperature deviation value are both positive constitute a continuous positive temperature deviation interval.

[0086] In some embodiments, by constructing a self-learning correction table for operating speed based on statistics of historical production data, and determining the speed correction value by looking up the table, it is easy to set corresponding correction records for complex changes in the working plan parameters of the strip during the production process, and realize rapid update and iteration of the self-learning correction table for operating speed during the production process. Table 2 is a specific embodiment of the self-learning correction table for operating speed,

[0087] Steel grade code Thickness lower limit Thickness limit Minimum width Maximum width Temperature deviation lower limit Temperature deviation lower limit Speed ​​correction value 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 in the production process is collected, and the strip speed and cooling water parameter table is updated according to the production data.

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

[0091] The above technical solution of the embodiment of the present invention is described in detail below in conjunction with specific application examples. For technical details not introduced during the implementation process, please refer to the relevant description in the previous text.

[0092] The present invention belongs to the technical field of hot rolling steel rolling. Specifically, it automatically matches reasonable finishing speed parameters and strip steel water settings according to parameters such as finishing rolling inlet temperature, single and double furnaces, and hot coil box commissioning mode, thereby improving the finishing speed and strip steel water automatic control stability and control accuracy. The embodiment of the present invention implements a finishing speed and strip steel water parameter setting method based on the original speed control setting. It basically realizes the control strategy of speed and temperature control for small changes in incoming material temperature, and water and speed control for large changes in incoming material temperature. It can ensure the stability of finishing rolling outlet temperature control while taking into account the production rhythm. At the same time, it improves production standardization and avoids quality fluctuations and production failures caused by differences and instability in manual control.

[0093] The embodiment of the present invention sets the speed and strip steel (cooling) water parameters according to the gear position of the strip steel temperature at the entrance of the finishing mill, and distinguishes the hot coil box commissioning mode, single and double furnace production mode, etc. A set of speed setting and strip steel water setting parameter tables are created, and the structure is shown in Appendix 1. According to the strip steel temperature at the entrance of the finishing mill, the strip steel is divided into subdivided grades, and each temperature gear position is configured with basic subdivision structures such as steel grade, width, thickness, etc. Finally, the speed parameters and strip steel water parameters corresponding to each matching parameter are used for secondary model control calculation. The speed parameters are consistent with the conventional speed parameter table, including 8 parameters: threading reference speed, threading minimum speed, threading maximum speed, running speed, tail throwing speed, first acceleration, second acceleration, and tail throwing acceleration. The strip steel water includes 4 parameters: F2 strip steel water, F3 strip steel water, F4 strip steel water, and F5 strip steel water. A total of 12 parameters are passed to the secondary model for the speed and strip steel water setting of this piece of strip steel.

[0094] The design features of temperature classification include the temperature range of 850-1150℃ at the entrance of the finishing mill, and the span of 50℃ for abnormal low temperature. At the same time, the normal rolling temperature range is 40℃ according to different steel types and sizes, and the rest of the temperature range is 20℃. For example, the common grade Q235B has a thickness x width of 4-20*1500mm (mm) and a normal rolling temperature range of 970-1010℃, and the temperature classification is 850-900, 900-950, 950-970, 970-1010, 1010-1030, 1030-1050, 1050-1150. The normal rolling temperature range is based on a larger temperature range, mainly considering the use of a strip steel water parameter setting in the same temperature range under the same conditions, so as to achieve the purpose of speed control and temperature control with a small change in the finishing rolling entrance temperature and water control and speed control with a large change in the finishing rolling entrance temperature, which is conducive to the calculation accuracy of the secondary model and the stability of the production rhythm.

[0095] Add a distinction between single and double furnace modes and hot coil box operation modes to further improve the precision and accuracy of parameter setting, while avoiding mutual influence of parameter debugging in different modes, and improving the speed and accuracy of strip steel molten steel setting parameters.

[0096] Add a program. After the head of each piece of steel reaches the entrance of finishing rolling and the pyrometer collects the inlet temperature, the program immediately searches this parameter table according to the inlet temperature, steel type, thickness and width, obtains the speed setting and strip steel water setting parameters and passes them to the secondary model for the control setting of this piece of steel, so as to realize the speed and strip steel water setting in the automatic state to control the finishing rolling exit temperature.

[0097] In some cases, the entrance temperature of the same piece of steel at the finishing rolling mill fluctuates greatly due to the heating of the heating furnace. The temperature at the head and tail is low and the temperature in the middle is high. The finishing rolling outlet temperature may be qualified at the head but over-temperature in the middle. According to the on-site production situation, the operating speed self-learning function in the non-use mode of the hot coil box is increased. The temperature data of the 1 / 3 position length in the middle of the finishing rolling outlet of the previous piece of steel is collected to calculate the average value. If the average value is lower than the target value within a certain range, the operating speed parameters are accelerated and compensated. If the average value is higher than the target value within a certain range, the operating speed parameters are decelerated and compensated, so as to achieve a certain degree of self-learning function.

[0098] The parameter table is debugged and maintained according to the on-site production big data, and precise parameters are set for different conditions. At the same time, the parameter table grading structure is optimized considering the changes in the finishing rolling outlet target temperature. Different finishing rolling outlet target temperature specifications cannot be divided into the same grade.

[0099] The embodiment of the present invention has the following technical effects: the embodiment of the present invention introduces the search conditions such as finishing rolling entrance temperature grading, single and double furnace mode, hot coil box commissioning mode, etc., to create a set of speed setting and strip steel water setting parameter tables with wide adaptability, stability and accuracy, and improve the stability and accuracy of speed and strip steel water parameter setting. The hot-rolled strip steel can usually be as thin as 1.2 mm and as thick as 28 mm. Strip steel thinner than 1.2 mm is suitable for cold rolling, and strip steel thicker than 28 mm cannot be coiled. It is particularly suitable for hot-rolled finishing rolling with a thickness of 2-25 mm and a width of 850-2000 mm. The design of temperature grading covers the finishing rolling entrance temperature range of 850-1150℃, and the span is 50℃ for abnormal low temperature conditions. At the same time, the normal rolling temperature range can be 40℃ according to different steel types and sizes, and the remaining temperature ranges are all 20℃. The normal rolling temperature range is based on a larger temperature range. It is mainly considered to use a strip steel water parameter setting in the same temperature range under the same conditions, so as to achieve the purpose of speed control and temperature control with a small change in the finishing rolling inlet temperature and water control and speed control with a large change in the finishing rolling inlet temperature, which is beneficial to the calculation accuracy of the secondary model and the stability of the production rhythm. The thickness and width are divided into grades according to the changes in the finishing rolling outlet temperature target to ensure that the finishing rolling outlet temperature target values ​​in the same gear are consistent, and to avoid parameter setting conflicts caused by different target temperatures in the same gear. According to the parameter table structure, an automatic indexing program is developed. After the head of each piece of steel reaches the finishing rolling entrance pyrometer to collect the inlet temperature, the program immediately searches this parameter table according to the inlet temperature, steel type, thickness, and width, obtains the speed setting and strip steel water setting parameters and passes them to the secondary model for the control setting of this piece of steel, so as to realize the speed and strip steel water setting control of the finishing rolling outlet temperature in the automatic state. The self-learning function of the running speed is realized, and the temperature data of the 1 / 3 position length in the middle of the finishing outlet of the previous block of steel is collected to calculate the average value. If the average value is lower than the target value within a certain range, the running speed parameter is adjusted for acceleration compensation. If the average value is higher than the target value within a certain range, the running speed parameter is adjusted for deceleration compensation. The learning rules are shown in Appendix 2. The maximum learning correction amount is ±0.2 m / s, and the self-learning amount is cleared after the end of the current rolling schedule, so as to realize a certain degree of self-learning function. The speed and strip steel parameter table can conveniently modify the increase and decrease of the search condition grading interval and parameter value, and then perform real-time matching optimization and debugging in combination with process changes and working conditions. The embodiment of the present invention is adopted with almost zero cost investment, and the search conditions such as finishing rolling inlet temperature grading, single and double furnace mode, and hot coil box commissioning mode are innovatively introduced, which greatly improves the stability and accuracy of the finishing rolling speed and strip steel retrieval parameters, and can adapt to temperature changes and mode changes under various product specifications, so as to achieve the purpose of speed control and temperature control with small changes in finishing rolling inlet temperature and water control and speed control with large changes in finishing rolling inlet temperature.The embodiment of the present invention has stable testing results on a hot rolling 2032 line, with an utilization rate of more than 80% (i.e., testing of 80% of all types of steel coils that can be produced on the hot rolling 2032 line has been completed), avoiding steel plate quality fluctuations and production failures caused by differences in manual operations, improving production control standardization, and being able to well match the rolling line production efficiency.

[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 can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0101] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0102] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present 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 above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including". In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0104] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

1. A method for setting finishing rolling speed and strip steel liquid parameters, characterized in that: include: When the head of the steel strip reaches the entrance of the finishing mill, the head temperature of the steel strip is detected, and the work plan parameters corresponding to the steel strip are obtained from the work plan; According to the head temperature of the steel strip and the corresponding work plan parameters, query the speed and cooling water parameter table of the steel strip, match and obtain the target record item, and use the speed parameter and cooling water supply parameter corresponding to the target record item as the speed parameter and cooling water supply parameter of the steel strip during the finishing rolling; wherein the work plan parameter range corresponding to the target record item includes the work plan parameter corresponding to the steel strip and the head temperature range of the target record item includes the head temperature of the steel strip; sending speed parameters and cooling water supply parameters of the steel strip during finish rolling to the secondary model; Among them, the secondary model is used to control the moving speed of the strip during the finishing rolling of the strip according to the speed parameters of the strip during the finishing rolling, and at the same time control the cooling water supply amount according to the cooling water supply parameters of the strip during the finishing rolling, so as to control the outlet temperature of the strip at the outlet of the finishing mill group 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 according to claim 1, characterized in that: The work plan parameter range corresponding to 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 work plan parameter range 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 according to claim 2, characterized in that: The work plan parameter range corresponding to each record item also includes: the corresponding single and double furnace modes and hot coil box commissioning modes; The work plan parameters corresponding to the strip steel also include corresponding single and double furnace modes and hot coil box commissioning modes. The work plan parameter range corresponding to the target record item includes the work plan parameters corresponding to the strip steel, and also includes: The single and double furnace modes in the work plan parameters corresponding to the strip are the same as the single and double furnace modes 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 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 according to claim 1, characterized in that: The speed parameters include: a reference speed for threading, a minimum speed for threading, a maximum speed for threading, a running speed, a steel throwing speed, a first acceleration, a second acceleration and a steel throwing acceleration.

5. The method for setting the finishing rolling speed and strip steel parameters according to claim 1, characterized in that: The cooling water supply parameters include: the strip cooling water supply switch status corresponding to the 2nd to N-1st 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 according to claim 1, characterized in that: The inlet temperature variation range of the head of the strip at the inlet of the finishing mill group includes an abnormally low temperature range, a normal rolling temperature range and an abnormally high temperature range; In the strip speed and cooling water parameter table, for the head temperature ranges corresponding to all record items matching the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is greater than the interval width of the head temperature range in the normal rolling temperature interval, and the interval width of the head temperature range in the normal rolling temperature interval is greater than the interval width of the head temperature range in the abnormally high temperature interval; Among them, 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 a temperature range lower than the normal rolling temperature range within the inlet temperature variation range; the abnormally high temperature range is a temperature range higher than the normal rolling temperature range within the inlet temperature variation range.

7. The method for setting the finishing rolling speed and strip steel parameters according to claim 6, characterized in that: In the strip speed and cooling water parameter table, for the head temperature ranges of all record items matching the work plan parameters corresponding to the strip, the interval width of the head temperature range in the abnormally low temperature interval is 46 to 55 degrees Celsius, the interval width of the head temperature range in the normal rolling temperature range is 35 to 45 degrees Celsius, and the interval width of the head temperature range in the abnormally high temperature range is 15 to 25 degrees Celsius.

8. The method for setting the finishing rolling speed and strip steel parameters according to claim 1, characterized in that: When the hot coil box operation mode is that the hot coil box is not in operation, the temperature average value of the temperature data of the front strip of the strip from the 1 / 3 to 2 / 3 length position of the strip head at the exit of the finishing mill group is collected; Comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling, if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during finishing rolling; The speed parameters of the steel strip during finish rolling include the running speed.

9. The method for setting the finishing rolling speed and strip steel parameters according to claim 8, characterized in that: The comparing the temperature average value with the target required outlet temperature, if the temperature average value is lower than the target required outlet temperature, performing acceleration compensation on the running speed of the speed parameter of the steel strip during the finishing rolling, if the temperature average value is higher than the target required outlet temperature, performing deceleration compensation on the running speed of the speed parameter of the steel strip during the finishing rolling, comprises: Calculate the temperature deviation between the average temperature and the target required outlet temperature; According to the temperature deviation value, and the steel grade, finished product thickness and finished product width of the work plan parameters corresponding to the steel strip, query the running speed self-learning correction table, select the target correction record, and use the speed correction value in the target correction record to add the running speed in the speed parameter of the steel strip during the finishing rolling, and use the added result to update the running speed in the speed parameter of the steel strip during the finishing rolling; Wherein, the running speed self-learning correction table includes a plurality of correction records; each correction record includes the corresponding steel grade, finished product thickness lower limit, finished product thickness upper limit, finished product width lower limit, finished product width upper limit, temperature deviation value lower limit, temperature deviation value upper limit and speed correction value; the running speed self-learning correction table is created in advance by statistically analyzing historical production data; the temperature deviation value lower limit and temperature deviation value upper limit 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 temperature deviation value lower limit and the temperature deviation value upper limit; The steel grade of the target correction record is the same as the steel grade of the work plan parameter corresponding to the strip, and the range formed by the lower limit and upper limit of the finished product thickness of the target correction record includes the finished product thickness of the work plan parameter corresponding to the strip, and the range formed by the lower limit and upper limit of the finished product width of the target correction record includes the finished product width of the work plan parameter corresponding to the strip, and the range formed by the lower limit and upper limit of the temperature deviation value of the target correction record includes the temperature deviation value.

10. The method for setting the finishing rolling speed and strip steel parameters according to claim 1, characterized in that: The production data in the production process is collected, and the strip speed and cooling water parameter table is updated according to the production data.

Images