A method for controlling the rolling rhythm of a slab

Abstract

The application provides a slab rolling rhythm control method, wherein the method comprises obtaining a planned time of a previous slab, accumulating the planned time; obtaining an actual time of the previous slab, accumulating the actual time; calculating a delay time of the previous slab according to the actual time and the planned time; calculating an accumulated planned correction time based on the delay time; obtaining an initial time interval value, accumulating the planned correction time based on the initial time interval value, determining a target time interval value; and controlling the slab rolling rhythm through the target time interval value. The application solves the problem of inaccurate slab rolling rhythm calculation in the prior art. The application obtains actual rolling data through online tracking of the slab rolling state, optimizes the calculation of the rolling data and the slab rolling rhythm value, and corrects the self-learning value of the slab, thereby ensuring the accuracy of the calculated rolling data and the slab rolling rhythm value, improving the production efficiency of the rolling production line and the performance of the finished product after slab rolling.

Description

Technical Field

[0001] This application relates to the field of steel rolling technology, and in particular to a method for controlling the rolling rhythm of slabs. Background Technology

[0002] As production capacity gradually increases, rolling rhythm becomes a bottleneck hindering further increases. Ensuring product quality while maximizing production line capacity within the effective rolling time is crucial, and the key performance indicator is the rolling mill's output per hour. Therefore, the control level of hot rolling rhythm directly affects hot rolling production output and energy consumption. An excessively fast rolling rhythm can cause strip misalignment on the rolling line, affecting subsequent production and product performance, and in severe cases, collisions and scrap. Conversely, an excessively slow rolling rhythm leads to decreased capacity, leaving equipment idle, wasting energy, and increasing costs.

[0003] Currently, the rolling rhythm value is generally set by the operator, and the heating furnace taps steel according to the given rolling rhythm value. This method mainly relies on the operator's ability to judge the production rhythm of the rolling line. However, due to the complexity and variability of the production conditions on the rolling line, and the frequent changes in product specifications, operators often cannot accurately determine the rolling rhythm. In addition, because this method requires operators to constantly monitor the rolling line status, it also places a heavy workload on the operators.

[0004] Therefore, how to adopt an effective method to achieve precise control of slab rolling rhythm, improve the accuracy of rolling rhythm calculation, and improve the production efficiency of rolling production lines and the performance of finished slab products after rolling are technical problems that urgently need to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method for controlling the rolling rhythm of slabs. This application can solve the problem of inaccurate calculation of the rolling rhythm of slabs in the prior art. This application tracks the rolling state of the slab on the rolling line online, obtains the actual rolling data of the slab on the rolling line, optimizes the calculation of rolling data and slab rolling rhythm value through the actual rolling data, and corrects the self-learning value of the slab to ensure the accuracy of subsequent slab rolling data calculation. This greatly improves the accuracy of rolling rhythm calculation, ensures stable production of the rolling line, and improves the production efficiency of the rolling line and the performance of the finished slab after rolling.

[0006] Specifically, this application adopts the following technical solution:

[0007] This application provides a method for controlling the rolling rhythm of a slab, the method comprising:

[0008] The first planned time for rolling the head of the previous slab in each rolling zone and the second planned time for rolling the tail of the previous slab in each rolling zone are obtained. A first cumulative planned time is calculated based on the first planned time for the head of the slab to complete rolling in each rolling zone, and a second cumulative planned time is calculated based on the second planned time for the tail of the slab to complete rolling in each rolling zone. The previous slab is rolled sequentially in each rolling zone. A first actual time for rolling the head of the previous slab in each rolling zone and the second actual time for rolling the tail of the previous slab in each rolling zone are obtained. A first cumulative actual time is calculated based on the first actual time for the head of the slab to complete rolling in each rolling zone, and a second cumulative actual time is calculated based on the second actual time for the tail of the slab to complete rolling in each rolling zone.

[0009] If the first actual time corresponding to any rolling zone is greater than the first planned time, then the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone is calculated based on the first actual time and the first planned time. If the second actual time corresponding to any rolling zone is greater than the second planned time, then the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone is calculated based on the second actual time and the second planned time. If the first actual time corresponding to any rolling zone is less than or equal to the first planned time, then the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone is determined to be 0. If the second actual time corresponding to any rolling zone is less than or equal to the second planned time, then the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone is determined to be 0.

[0010] The first cumulative planned time is corrected based on the first delay time to obtain the first cumulative planned time correction when the head of the previous slab completes rolling in each rolling zone. The second cumulative planned time is corrected based on the second delay time to obtain the second cumulative planned time correction when the tail of the previous slab completes rolling in each rolling zone.

[0011] The initial time interval between the previous slab and the next slab during the rolling process is obtained. Based on the initial time interval, the second cumulative planned correction time, and the first cumulative planned time, candidate time interval values ​​corresponding to each rolling zone are calculated, and the largest candidate time interval value is determined as the target time interval value. The slab rolling rhythm is controlled by the target time interval value.

[0012] In some embodiments of this application, based on the foregoing scheme, the calculation formulas for the first cumulative planned time and the second cumulative planned time are as follows:

[0013]

[0014]

[0015] in, This indicates the first cumulative planned time of the slab head in rolling sub-region i of the previous slab. This indicates the first planned time for the slab head of the previous slab in rolling sub-region i. This represents the head self-learning value of the slab head in the rolling sub-region i of the previous slab; This indicates the second cumulative planned time for the tail of the previous slab in rolling sub-region i. This indicates the second planned time for the tail of the previous slab in rolling sub-region i. This represents the tail self-learning value of the tail of the previous slab in the rolling sub-region i.

[0016] In some embodiments of this application, based on the foregoing scheme, the calculation formulas for the first cumulative actual time and the second cumulative actual time are as follows:

[0017]

[0018]

[0019] in, This represents the first cumulative actual time of the slab head in the rolling sub-region i of the previous slab; This is represented as the first actual time of the slab head in the rolling sub-region i of the previous slab; The second cumulative actual time of the tail of the previous slab in the rolling sub-region i is represented by the previous slab. The tail of a slab is in the second actual time of the rolling sub-region i.

[0020] In some embodiments of this application, based on the foregoing scheme, the calculation formulas for the first delay time and the second delay time are as follows:

[0021]

[0022]

[0023] in, This indicates the first delay time of the slab head in the rolling sub-region i of the previous slab; This indicates the second delay time of the tail of the previous slab in the rolling sub-region i.

[0024] In some embodiments of this application, based on the foregoing scheme, the calculation formulas for the first cumulative plan correction time and the second cumulative plan correction time are as follows:

[0025]

[0026]

[0027] in, This indicates the first cumulative planned correction time of the slab head of the previous slab within the rolling sub-region i; This indicates the second cumulative planned correction time for the tail of the previous slab within the rolling sub-region i.

[0028] In some embodiments of this application, based on the foregoing scheme, the calculation formula for the target time interval value is as follows:

[0029]

[0030]

[0031] in, Δd represents the candidate time interval value between the previous slab and the next slab within the rolling sub-region i; i The initial time interval between the previous slab and the next slab within the rolling sub-region i is represented by Pac; the target time interval between the previous slab and the next slab within the rolling sub-region i is represented by Pac.

[0032] In some embodiments of this application, based on the foregoing scheme, the method further includes:

[0033] Based on the first cumulative actual time and the first cumulative planned time, the head self-learning value is corrected to obtain the head corrected self-learning value;

[0034] Based on the second cumulative actual time and the second cumulative planned time, the tail self-learning value is corrected to obtain the tail corrected self-learning value. The correction formulas for the head corrected self-learning value and the tail corrected self-learning value are as follows:

[0035]

[0036]

[0037] in, This indicates that the head correction self-learning value, This represents the tail correction self-learning value.

[0038] In some embodiments of this application, based on the foregoing scheme, the method further includes:

[0039] Based on the target time interval value, the second cumulative actual time, and the first cumulative actual time, the actual time interval value between the next slab and the adjacent slab in each rolling zone is calculated.

[0040] If the actual time interval value is greater than 0, it is predicted that the next slab will not collide with the adjacent slab in the corresponding rolling area. If the actual time interval value is less than or equal to 0, it is predicted that the next slab will collide with the adjacent slab in the corresponding rolling area.

[0041] In some embodiments of this application, based on the foregoing scheme, the formula for calculating the actual time interval value is as follows:

[0042]

[0043] in, This represents the actual time interval between the next slab and the adjacent slab within the rolling sub-region i; Pac act This represents the target time interval value for the next slab within the rolling sub-region i.

[0044] In some embodiments of this application, based on the foregoing scheme, each rolling zone includes a width-fixing mill zone, a two-high roughing mill zone, a four-high roughing mill zone, a finishing mill zone, and a coiler zone.

[0045] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0046] Firstly, this application solves the problem of inaccurate calculation of slab rolling rhythm in the prior art. This application tracks the rolling state of the slab on the rolling production line online to obtain the actual rolling data of the slab on the rolling production line. The actual rolling data is used to optimize the calculation of rolling data and slab rolling rhythm value, and the self-learning value of the slab is corrected to ensure the accuracy of subsequent slab rolling data calculation. This greatly improves the accuracy of rolling rhythm calculation, ensures stable production of the rolling production line, and improves the production efficiency of the rolling production line and the performance of the finished slab after rolling.

[0047] Secondly, this application obtains the actual rolling data of the slab on the rolling production line and calculates the actual interval time value between two adjacent slabs in the rolling area based on the actual rolling data, so as to predict the collision situation of two adjacent slabs in the rolling area and avoid the occurrence of collision accidents between two adjacent slabs in actual rolling. Attached Figure Description

[0048] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0049] Figure 1 A flowchart of a method for controlling the rolling rhythm of slabs according to one embodiment of this application is shown;

[0050] Figure 2 A schematic diagram of the slab rolling section in one embodiment of this application is shown. Detailed Implementation

[0051] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0052] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0053] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0055] During the slab rolling process, controlling the slab rolling rhythm is crucial to the production capacity of the rolling line. In hot continuous rolling, the level of control over the hot rolling rhythm directly affects the production capacity and energy consumption of the hot rolling line. An excessively fast rolling rhythm can lead to strip misalignment accidents, affecting subsequent production and product performance. In severe cases, it can cause collisions between adjacent slabs, resulting in scrap. Conversely, an excessively slow rolling rhythm leads to a decrease in production line capacity, leaving equipment idle, wasting energy, and increasing costs. While slab rolling rhythm values ​​can be determined using slab rolling rhythm models, existing models often suffer from inaccuracies due to their limited parameters and incomplete consideration of factors. Alternatively, operators can provide rolling rhythm values, but the complex and variable production conditions of rolling lines, along with numerous variations in steel grades and specifications, often make it difficult for operators to provide precise values. Furthermore, this method requires constant monitoring of the rolling line, placing a significant workload on the operators.

[0056] To address the aforementioned issues, this application proposes a method for controlling the rolling rhythm of slabs. By tracking the rolling state of the slab on the rolling line online, the actual rolling data of the slab on the rolling line is obtained. The actual rolling data is then used to optimize the calculation of rolling data and the rolling rhythm value of the slab, and the self-learning value of the slab is corrected to ensure the accuracy of subsequent slab rolling data calculations. This significantly improves the accuracy of rolling rhythm calculation, ensures stable production on the rolling line, and enhances the production efficiency of the rolling line and the performance of the finished slab after rolling.

[0057] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0058] According to this application, a method for controlling the rolling rhythm of a slab is provided, with reference to... Figure 1 The following is a flowchart of a method for controlling the rolling rhythm of a slab according to this application. The method for controlling the rolling rhythm of a slab includes the following steps S1 to S7:

[0059] Step S1: Obtain the first planned time for the slab head to be rolled in each rolling zone and the second planned time for the slab tail to be rolled in each rolling zone. Calculate the first cumulative planned time for the slab head to complete rolling in each rolling zone based on the first planned time and the second cumulative planned time for the slab tail to complete rolling in each rolling zone based on the second planned time. The previous slab is rolled sequentially in each rolling zone.

[0060] In this application, before the previous slab enters the rolling production line, the steel grade information and rolling parameters of the previous slab can be input into the slab rolling rhythm model. The slab rolling rhythm model calculates the first planned rolling time for the head of the previous slab in each rolling zone, and the second planned rolling time for the tail of the previous slab in each rolling zone. For example, when the rolling zones are a first rolling zone, a second rolling zone, a third rolling zone, a fourth rolling zone, and a fifth rolling zone, the slab rolling rhythm model can calculate the first planned rolling time for the head of the previous slab in the first, second, third, fourth, and fifth rolling zones, and the first planned rolling time for the tail of the previous slab in the same zones.

[0061] After obtaining the first planned time and the second planned time, the first cumulative planned time for the slab head to complete rolling in each rolling zone can be calculated based on the first planned time. For example, when the rolling zones are the first rolling zone, the second rolling zone, the third rolling zone, the fourth rolling zone, and the fifth rolling zone, the first cumulative planned time for the slab head to complete rolling in each of the first, second, third, fourth, and fifth rolling zones can be calculated based on the first planned time for the slab head to complete rolling in each of the first, second, third, fourth, and fifth rolling zones. For example, when calculating the first cumulative planned time of the slab head in the first rolling zone of the previous slab, it is the first planned time of the slab head in the first rolling zone plus the head self-learning value of the slab head in the first rolling zone; when calculating the first cumulative planned time of the slab head in the second rolling zone of the previous slab, it is the first planned time of the slab head in the first rolling zone plus the head self-learning value of the slab head in the first rolling zone, and the sum of the first planned time of the slab head in the second rolling zone plus the head self-learning value of the slab head in the second rolling zone. The first cumulative planned time of the slab head in the third, fourth, and fifth rolling zones of the previous slab can also be calculated in the same way.

[0062] The second cumulative planned time for the tail of the slab to complete rolling in each rolling zone can also be calculated based on the second planned time. For example, when the rolling zones are a first rolling zone, a second rolling zone, a third rolling zone, a fourth rolling zone, and a fifth rolling zone, the second cumulative planned time for the previous slab to complete rolling in the first rolling zone, the second rolling zone, the third rolling zone, the fourth rolling zone, and the fifth rolling zone can be calculated based on the second planned time for the tail of the slab to complete rolling in each of the first rolling zone, the second rolling zone, the third rolling zone, the fourth rolling zone, and the fifth rolling zone. For example, when calculating the second cumulative planned time of the tail of the previous slab in the first rolling zone, it is the second planned time of the tail of the slab in the first rolling zone plus the tail self-learning value of the tail of the slab in the first rolling zone; when calculating the second cumulative planned time of the tail of the previous slab in the second rolling zone, it is the second planned time of the tail of the slab in the first rolling zone plus the tail self-learning value of the tail of the slab in the first rolling zone, and the sum of the second planned time of the tail of the slab in the second rolling zone plus the tail self-learning value of the tail of the slab in the second rolling zone. The second cumulative planned time of the tail of the previous slab in the third, fourth, and fifth rolling zones can also be calculated in the same way.

[0063] In one embodiment of this application, taking the example that each rolling region includes i rolling sub-regions, the calculation formulas for the first cumulative planned time of the slab head of the previous slab and the calculation formulas for the second cumulative planned time of the slab tail of the previous slab in rolling sub-region i are as follows:

[0064]

[0065]

[0066] in, This indicates the first cumulative planned time of the slab head in rolling sub-region i of the previous slab. This indicates the first planned time for the slab head of the previous slab in rolling sub-region i. This represents the head self-learning value of the slab head in the rolling sub-region i of the previous slab; This indicates the second cumulative planned time for the tail of the previous slab in rolling sub-region i. This indicates the second planned time for the tail of the previous slab in rolling sub-region i. This represents the tail self-learning value of the tail of the previous slab in the rolling sub-region i.

[0067] Step S2: Obtain the first actual time of rolling the head of the previous slab in each rolling zone, and obtain the second actual time of rolling the tail of the previous slab in each rolling zone. Calculate the first cumulative actual time when the head of the slab completes rolling in each rolling zone based on the first actual time, and calculate the second cumulative actual time when the tail of the slab completes rolling in each rolling zone based on the second actual time.

[0068] In this application, after calculating the first planned time and the first cumulative planned time of the slab head of the previous slab, and the second planned time and the second cumulative planned time of the slab tail of the previous slab, in order to determine whether the obtained rolling data is accurate, it is also necessary to track the rolling state of the previous slab on the rolling line online to obtain the actual rolling data of the previous slab on the rolling line. After the previous slab is coiled, the actual rolling data of the previous slab in each rolling zone can be obtained, that is, the first actual time of the slab head rolling in each rolling zone and the second actual time of the slab tail rolling in each rolling zone can be obtained. Then, the first cumulative actual time when the slab head completes rolling in each rolling zone can be calculated based on the first actual time, and the second cumulative actual time when the slab tail completes rolling in each rolling zone can be calculated based on the second actual time.

[0069] Continuing with the example of the first, second, third, fourth, and fifth rolling regions, after the previous slab is coiled, the first actual time during which the head of the previous slab is rolled in each of the first, second, third, fourth, and fifth rolling regions during actual production on the rolling line can be obtained. Then, based on the first actual time during which the head of the slab is rolled in each of the first, second, third, fourth, and fifth rolling regions, the first cumulative actual time during which the head of the slab is rolled in each of the first, second, third, fourth, and fifth rolling regions can be calculated. For example, when calculating the first cumulative actual time of the slab head in the first rolling zone, the first cumulative actual time in the first rolling zone is the first actual time of the slab head in the first rolling zone; when calculating the first cumulative actual time of the slab head in the second rolling zone, it is the sum of the first actual time of the slab head in the first rolling zone and the first actual time of the slab head in the second rolling zone, and the first cumulative actual time of the slab head in the third, fourth, and fifth rolling zones can be deduced in the same way.

[0070] The second cumulative actual time for the tail of the slab to complete rolling in each rolling zone can also be calculated based on the second actual time. For example, when the rolling zones are a first rolling zone, a second rolling zone, a third rolling zone, a fourth rolling zone, and a fifth rolling zone, the second cumulative actual time for the tail of the slab to complete rolling in each of the first, second, third, fourth, and fifth rolling zones can be calculated based on the second actual time for the tail of the slab to complete rolling in each of the first, second, third, fourth, and fifth rolling zones. For example, when calculating the second cumulative actual time of the tail of the previous slab in the first rolling zone, it is the second actual time of the tail of the slab in the first rolling zone; when calculating the second cumulative actual time of the tail of the previous slab in the second rolling zone, it is the sum of the second actual time of the tail of the slab in the first rolling zone and the second actual time of the tail of the slab in the second rolling zone. The second cumulative actual time of the tail of the previous slab in the third, fourth and fifth rolling zones can also be deduced in the same way.

[0071] In one embodiment of this application, taking the example that each rolling region includes i rolling sub-regions, the calculation formulas for the first cumulative actual time of the slab head of the previous slab and the calculation formulas for the second cumulative actual time of the slab tail of the previous slab in rolling sub-region i are as follows:

[0072]

[0073]

[0074] in, This represents the first cumulative actual time of the slab head in the rolling sub-region i of the previous slab; This is represented as the first actual time when the head of the previous slab is in the rolling sub-region i; The second cumulative actual time of the tail of the previous slab in the rolling sub-region i is represented by the previous slab. The tail of a slab is in the second actual time of the rolling sub-region i.

[0075] Step S3: If the first actual time corresponding to any rolling zone is greater than the first planned time, then calculate the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone based on the first actual time and the first planned time; and if the second actual time corresponding to any rolling zone is greater than the second planned time, then calculate the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone based on the second actual time and the second planned time.

[0076] In this application, after obtaining the first planned time and the first actual time of the slab head in each rolling zone, and the second planned time and the second actual time of the slab tail in each rolling zone, the first delay time of the slab head in each rolling zone can be calculated based on the first actual time and the first planned time. The first delay time can be understood as the time by which the first actual time of the slab head in each rolling zone is delayed compared to the first planned time. For example, if the calculated first planned time of the slab head in the second rolling zone is 35s, but the calculated first actual time of the slab head in the second rolling zone is 36s, then subtracting the first planned time (36s) from the first actual time (35s) ​​gives 1s, which is the first delay time (1s) of the slab head in the second rolling zone.

[0077] The second delay time of the slab tail in each rolling zone can also be calculated based on the second planned time and the second actual time of the slab tail in each rolling zone. The second delay time can be understood as the time that the second actual time of the slab tail in each rolling zone is delayed by the second planned time. For example, if the calculated second planned time of the slab tail in the second rolling zone is 40s, but the calculated second actual time of the slab head in the second rolling zone is 42s, then subtracting the second planned time (40s) from the second actual time (42s) gives 2s, which is the second delay time (2s) of the slab tail in the second rolling zone.

[0078] In one embodiment of this application, taking the example that each rolling region includes i rolling sub-regions, the calculation formulas for the first delay time of the slab head and the second delay time of the slab tail of the previous slab in rolling sub-region i are as follows:

[0079]

[0080]

[0081] in, This indicates the first delay time of the slab head in the rolling sub-region i of the previous slab;

[0082] This indicates the second delay time of the tail of the previous slab in the rolling sub-region i.

[0083] Step S4: If the first actual time corresponding to any rolling zone is less than or equal to the first planned time, then the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone is determined to be 0; and if the second actual time corresponding to any rolling zone is less than or equal to the second planned time, then the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone is determined to be 0.

[0084] In this application, it is important to note that during the actual rolling of slabs, if the slab arrives at the next rolling zone ahead of schedule, no rolling problems will occur. However, if the arrival is delayed, it may lead to a longer waiting time for the next slab or a collision between the next and previous slabs. Therefore, it is necessary to prevent the slab from arriving late. After calculating the first and second delay times of the previous slab in each rolling zone, the first and second cumulative planned times of the previous slab can be corrected based on these times. It is important to note that if the first actual time corresponding to any rolling zone is less than or equal to the first planned time, the first delay time for the head of the previous slab to be rolled in the corresponding rolling zone is determined to be 0. Similarly, if the second actual time corresponding to any rolling zone is less than or equal to the second planned time, the second delay time for the tail of the previous slab to be rolled in the corresponding rolling zone is determined to be 0.

[0085] Step S5: After obtaining the first delay time, the first cumulative planned time can be corrected based on the first delay time to obtain the first cumulative planned correction time when the head of the previous slab completes rolling in each rolling area; after obtaining the second delay time, the second cumulative planned time can be corrected based on the second delay time to obtain the second cumulative planned correction time when the tail of the previous slab completes rolling in each rolling area.

[0086] In one embodiment of this application, taking the example that each rolling region includes i rolling sub-regions, the calculation formulas for the first cumulative planned correction time of the slab head of the previous slab and the calculation formulas for the second cumulative planned correction time of the slab tail of the previous slab in rolling sub-region i are as follows:

[0087]

[0088]

[0089] in, This indicates the first cumulative planned correction time of the slab head of the previous slab within the rolling sub-region i; This indicates the second cumulative planned correction time for the tail of the previous slab within the rolling sub-region i.

[0090] Step S6: Obtain the initial time interval between the previous slab and the next slab during the rolling process, and based on the initial time interval, the second cumulative planned correction time, and the first cumulative planned time, calculate the candidate time interval values ​​corresponding to each rolling area, and determine the target time interval value by the largest candidate time interval value.

[0091] In this application, the initial time interval between the previous slab and the next slab during the rolling process can be obtained based on the steel grade information of the previous slab and the next slab (the previous slab and the next slab can be of the same steel grade). The initial time interval value can also be given according to the steel grade information, and the range of the initial time interval value can be 0s to 50s. After determining the initial time interval value between the previous slab and the next slab during the rolling process, candidate time interval values ​​corresponding to each rolling zone can be calculated based on the initial time interval value, the second cumulative planned correction time, and the first cumulative planned time, and the largest candidate time interval value is determined as the target time interval value.

[0092] In one embodiment of this application, taking the example that each rolling region includes i rolling sub-regions, the calculation formula for the target time interval value in rolling sub-region i is as follows:

[0093]

[0094]

[0095] in, Δd represents the candidate time interval value between the previous slab and the next slab within the rolling sub-region i; i The initial time interval between the previous slab and the next slab within the rolling sub-region i is represented by Pac; the target time interval between the previous slab and the next slab within the rolling sub-region i is represented by Pac.

[0096] Step S7: Control the slab rolling rhythm using the target time interval value. It can be understood that the target time interval value is the slab rolling rhythm value. For example, when the target time interval value is 90s, it means that 90s after the previous slab enters the rolling zone and begins rolling, the next slab is then controlled to enter the rolling zone for rolling.

[0097] In one embodiment of this application, the method further includes: correcting the head self-learning value based on the first cumulative actual time and the first cumulative planned time to obtain a head corrected self-learning value; and correcting the tail self-learning value based on the second cumulative actual time and the second cumulative planned time to obtain a tail corrected self-learning value. Taking each rolling region as an example comprising i rolling sub-regions, the correction formulas for the head corrected self-learning value and the tail corrected self-learning value in rolling sub-region i are as follows:

[0098]

[0099]

[0100] in, This indicates that the head correction self-learning value, This represents the tail correction self-learning value.

[0101] In this application, due to the limited parameters and incomplete consideration of factors in the slab rolling rhythm model, the calculated slab rolling rhythm values ​​are inaccurate. Since the head self-learning value and the tail self-learning value are crucial to the accuracy of the calculated slab rolling data, it is necessary to correct the head self-learning value and the tail self-learning value when the slab rolling rhythm value and rolling parameters are inaccurate, in order to ensure the accuracy of the subsequent calculation of rolling parameters and slab rolling rhythm values ​​for slabs of the same steel grade.

[0102] In one embodiment of this application, after obtaining the target time interval value, the actual time interval between the next slab and the adjacent slab in each rolling zone can be calculated based on the target time interval value, the second cumulative actual time, and the first cumulative actual time.

[0103] If the actual time interval value is greater than 0, it is predicted that the next slab will not collide with the adjacent slab in the corresponding rolling area. If the actual time interval value is less than or equal to 0, it is predicted that the next slab will collide with the adjacent slab in the corresponding rolling area. In this case, the actual time interval value between the next slab and the adjacent slab needs to be adjusted when the next slab is actually rolled.

[0104] In one embodiment of this application, the formula for calculating the actual time interval value is as follows:

[0105]

[0106] in, This represents the actual time interval between the next slab and the adjacent slab within the rolling sub-region i; Pac act This represents the target time interval value for the next slab within the rolling sub-region i.

[0107] In one embodiment of this application, the various rolling zones may include a width-fixing mill zone, a two-high roughing mill zone, a four-high roughing mill zone, a finishing mill zone, and a coiler zone.

[0108] The specific implementation of this application will be further illustrated by specific embodiments below, but the specific implementation of this application is not limited to the following embodiments.

[0109] In a specific embodiment of this application, the selected hot continuous rolling production line has the following main parameters: Continuous rolling process section: six-stand four-high tandem hot continuous rolling mill; product thickness range: 1.5mm~19mm; product width range: 750mm~2130mm; product types: automotive steel, pickled steel, welded cylinder steel, pipeline steel, weathering steel, patterned steel, etc.; rolling areas: in sequence according to the slab rolling order, including width-fixing mill area 201 (area 1), two-high roughing mill area 202 (area 2), four-high roughing mill area 203 (area 3), finishing mill area 204 (area 4), and coiler area 205 (area 5). The core research object of this invention is the process model and process data. This example rolling production line is equipped with advanced detection instruments, including infrared pyrometers, pressure sensors, position sensors, and other advanced detection instruments, providing a reliable data source for the implementation of this invention.

[0110] Step 1: Obtain the first planned time for rolling the head of the previous slab in each rolling zone, and the second planned time for rolling the tail of the previous slab in each rolling zone. Calculate the first cumulative planned time for the slab head to complete rolling in each rolling zone based on the first planned time, and calculate the second cumulative planned time for the slab tail to complete rolling in each rolling zone based on the second planned time. The previous slab is rolled sequentially in each rolling zone. Wherein, according to the formula... and formula The calculated rolling data are shown in Table 1 below:

[0111] Table 1

[0112]

[0113] Step two: Obtain the first actual time for the slab head to be rolled in each rolling zone, and obtain the second actual time for the slab tail to be rolled in each rolling zone. Based on the first actual time, calculate the first cumulative actual time for the slab head to complete rolling in each rolling zone, and based on the second actual time, calculate the second cumulative actual time for the slab tail to complete rolling in each rolling zone. Wherein, according to the formula... and formula The calculated rolling data are shown in Table 2 below:

[0114] Table 2

[0115]

[0116] Step 3: If the first actual time corresponding to any rolling zone is greater than the first planned time, then calculate the first delay time for the head of the previous slab to be rolled in the corresponding rolling zone based on the first actual time and the first planned time; and if the second actual time corresponding to any rolling zone is greater than the second planned time, then calculate the second delay time for the tail of the previous slab to be rolled in the corresponding rolling zone based on the second actual time and the second planned time. Wherein, according to the formula... and The calculated rolling data are shown in Table 3 below:

[0117] Table 3

[0118]

[0119] Step four: Based on the first delay time, correct the first cumulative planned time to obtain the first cumulative planned correction time when the head of the previous slab completes rolling in each rolling zone; based on the second delay time, correct the second cumulative planned time to obtain the second cumulative planned correction time when the tail of the previous slab completes rolling in each rolling zone. Wherein, according to the formula... and The calculated rolling data are shown in Table 4 below:

[0120] Table 4

[0121]

[0122]

[0123] Step 5: Obtain the initial time interval between the previous slab and the next slab during the rolling process. Based on the initial time interval, the second cumulative planned correction time, and the first cumulative planned time, calculate the candidate time interval values ​​corresponding to each rolling zone, and determine the target time interval value by selecting the largest candidate time interval value. Control the slab rolling rhythm using the target time interval value. Wherein, according to the formula... and The calculated rolling data are shown in Table 5 below. Δd is determined based on the steel grade information of the previous and next slabs. i The value is 20s.

[0124] Table 5

[0125]

[0126] According to the formula The candidate time interval values ​​can be calculated as follows: Region 1: 46s; Region 2: 20s; Region 3: 95s; Region 4: 95s; and Region 5: 90s. Because... The largest candidate time interval value is determined as the target time interval value, that is, the target time interval value is 95s. The rolling rhythm of slabs of the same steel grade can be controlled by the target time interval value (95s).

[0127] On the one hand, the head self-learning value can be corrected based on the first cumulative actual time and the first cumulative planned time of the previous slab in regions 1, 2, 3, 4, and 5 respectively, to obtain a head corrected self-learning value; and the tail self-learning value can be corrected based on the second cumulative actual time and the second cumulative planned time of the previous slab in regions 1, 2, 3, 4, and 5 respectively, to obtain a head corrected self-learning value. Wherein, according to the formula... and The calculated rolling data are shown in Table 6 below:

[0128] Table 6

[0129]

[0130] After obtaining the head correction self-learning value, it can be applied to the calculation of subsequent slab rolling parameters to ensure the accuracy of the calculated rolling parameters and slab rolling rhythm value.

[0131] On the other hand, based on the target time interval values ​​of the previous slab in regions 1, 2, 3, 4, and 5, respectively, the second cumulative actual time, and the first cumulative actual time, the actual time interval between the next slab and the adjacent slab in each rolling region can be calculated. If the actual time interval value is greater than 0, it is predicted that the next slab will not collide with the adjacent slab in the corresponding rolling region. If the actual time interval value is less than or equal to 0, it is predicted that the next slab will collide with the adjacent slab in the corresponding rolling region. In this case, the actual time interval value between the next slab and the adjacent slab needs to be adjusted when the next slab is actually rolled. According to the formula... The calculated rolling data are shown in Table 7 below:

[0132] Table 7

[0133]

[0134] Based on the above calculation results, Pac act When the time interval is 95s, the calculated actual time interval values ​​are all greater than 0, meaning that when rolling according to the target time interval value of 95s, adjacent slabs will not collide.

[0135] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0136] Firstly, the proposed solution solves the problem of inaccurate calculation of slab rolling rhythm in the prior art. This application tracks the rolling state of the slab on the rolling line online to obtain the actual rolling data of the slab on the rolling line. The actual rolling data is used to optimize the calculation of rolling data and slab rolling rhythm value, and the self-learning value of the slab is corrected to ensure the accuracy of subsequent slab rolling data calculation. This greatly improves the accuracy of rolling rhythm calculation, ensures stable production of the rolling line, and improves the production efficiency of the rolling line and the performance of the finished slab after rolling.

[0137] Secondly, by adopting the scheme proposed in this application, the actual rolling data of the slab on the rolling production line is obtained, and the actual interval time value between two adjacent slabs in the rolling area is calculated based on the actual rolling data, so as to predict the collision situation of two adjacent slabs in the rolling area and avoid the occurrence of collision accidents between two adjacent slabs in actual rolling.

[0138] Third, by adopting the scheme proposed in this application, the model calculation value is corrected by utilizing the actual running time and state of the slab in the rolling production line. At the same time, the control requirements of different steel grades are considered, and the optimal rhythm time can be accurately calculated to realize automatic control of the rolling rhythm, thereby shortening the rolling time interval of the rolling production line and increasing the hourly output of the rolling production line.

[0139] Fourth, adopting the solution proposed in this application can ensure the high-quality production of slab-rolled finished strip steel, improve the quality and production efficiency of strip steel, increase market competitiveness and financial returns, greatly reduce the amount of scrapped strip steel and equipment damage, and save resources and equipment maintenance funds.

[0140] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0141] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since this application can be embodied in many forms without departing from the spirit or substance of the application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for controlling the rolling rhythm of slabs, characterized in that, The method includes: The first planned time for rolling the head of the previous slab in each rolling zone is obtained, and the second planned time for rolling the tail of the previous slab in each rolling zone is obtained. Based on the first planned time, the first cumulative planned time for the head of the slab to complete rolling in each rolling zone is calculated, and based on the second planned time, the second cumulative planned time for the tail of the slab to complete rolling in each rolling zone is calculated. The previous slab is rolled sequentially in each rolling zone. The first actual time of rolling the head of the previous slab in each rolling zone is obtained, and the second actual time of rolling the tail of the previous slab in each rolling zone is obtained. Based on the first actual time, the first cumulative actual time of rolling the head of the slab in each rolling zone is calculated, and based on the second actual time, the second cumulative actual time of rolling the tail of the slab in each rolling zone is calculated. If the first actual time corresponding to any rolling zone is greater than the first planned time, then the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone is calculated based on the first actual time and the first planned time. If the second actual time corresponding to any rolling zone is greater than the second planned time, then the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone is calculated based on the second actual time and the second planned time. If the first actual time corresponding to any rolling zone is less than or equal to the first planned time, then the first delay time for the slab head of the previous slab to be rolled in the corresponding rolling zone is determined to be 0; and if the second actual time corresponding to any rolling zone is less than or equal to the second planned time, then the second delay time for the slab tail of the previous slab to be rolled in the corresponding rolling zone is determined to be 0. The first cumulative planned time is corrected based on the first delay time to obtain the first cumulative planned time correction when the head of the previous slab completes rolling in each rolling zone. The second cumulative planned time is corrected based on the second delay time to obtain the second cumulative planned time correction when the tail of the previous slab completes rolling in each rolling zone. The initial time interval between the previous slab and the next slab during the rolling process is obtained. Based on the initial time interval, the second cumulative planned correction time, and the first cumulative planned time, candidate time interval values ​​corresponding to each rolling zone are calculated, and the largest candidate time interval value is determined as the target time interval value. The rolling rhythm of the slab is controlled by the target time interval value.

2. The method according to claim 1, characterized in that, The formulas for calculating the first cumulative planned time and the second cumulative planned time are as follows: in, This indicates that the head of the previous slab is in the rolling sub-region. i The first cumulative planned time, This indicates that the head of the previous slab is in the rolling sub-region. i The first planned time, This indicates that the head of the previous slab is in the rolling sub-region. i Head self-learning value; This indicates that the tail of the previous slab is in the rolling sub-region. i The second cumulative planning period, This indicates that the tail of the previous slab is in the rolling sub-region. i The second planned time, This indicates that the tail of the previous slab is in the rolling sub-region. i The tail self-learning value.

3. The method according to claim 2, characterized in that, The formulas for calculating the first cumulative actual time and the second cumulative actual time are as follows: in, This refers to the slab head of the previous slab in the rolling sub-region. i The first cumulative actual time; This refers to the slab head of the previous slab in the rolling sub-region. i The first actual time; This refers to the tail of the previous slab in the rolling sub-region. i The second cumulative actual time; This refers to the tail of the previous slab in the rolling sub-region. i The second actual time.

4. The method according to claim 3, characterized in that, The formulas for calculating the first delay time and the second delay time are as follows: in, This indicates that the head of the previous slab is in the rolling sub-region. i The first delay time; This indicates that the tail of the previous slab is in the rolling sub-region. i The second delay time.

5. The method according to claim 4, characterized in that, The formulas for calculating the first cumulative plan revision time and the second cumulative plan revision time are as follows: in, This indicates that the head of the previous slab is in the rolling sub-region. i The first cumulative plan revision time within the period; This indicates that the tail of the previous slab is in the rolling sub-region. i The second cumulative plan revision time within the period.

6. The method according to claim 5, characterized in that, The formula for calculating the target time interval value is: in, This indicates that the previous slab and the next slab are in the rolling sub-region. i Candidate time interval values ​​within; This indicates that the previous slab and the next slab are in the rolling sub-region. i The initial time interval within; This indicates that the previous slab and the next slab are in the rolling sub-region. i The target time interval value within.

7. The method according to claim 6, characterized in that, The method further includes: Based on the first cumulative actual time and the first cumulative planned time, the head self-learning value is corrected to obtain the head corrected self-learning value; Based on the second cumulative actual time and the second cumulative planned time, the tail self-learning value is corrected to obtain the tail corrected self-learning value. The correction formulas for the head corrected self-learning value and the tail corrected self-learning value are as follows: in, This indicates that the head correction self-learning value, This represents the tail correction self-learning value.

8. The method according to claim 7, characterized in that, The method further includes: Based on the target time interval value, the second cumulative actual time, and the first cumulative actual time, the actual time interval value between the next slab and the adjacent slab in each rolling zone is calculated. If the actual time interval value is greater than 0, it is predicted that the next slab will not collide with the adjacent slab in the corresponding rolling area. If the actual time interval value is less than or equal to 0, it is predicted that the next slab will collide with the adjacent slab in the corresponding rolling area.

9. The method according to claim 8, characterized in that, The formula for calculating the actual time interval value is as follows: in, Indicates the rolling sub-region i The actual time interval between the next slab and the adjacent slab is described in the following text; Indicates the rolling sub-region i The target time interval value for the next slab described herein.

10. The method according to claim 1, characterized in that, The various rolling zones include the width-fixing mill zone, the two-high roughing mill zone, the four-high roughing mill zone, the finishing mill zone, and the coiler zone.

Images