Method and system for optimizing control of billet supply rhythm for directly rolling a hot billet without heating

Abstract

The present invention provides an optimization control method and system for billet supply rhythm for directly rolling a hot billet without heating, which can solve the problem of the prior art that the direct rolling reduction rate is relatively low when directly rolling a hot billet without heating. The present invention can expand the application range of the process of directly rolling a hot billet without heating and improve the direct rolling reduction rate of the hot billet by combining the optimization control model for the billet supply rhythm with the production process of directly rolling a hot billet without heating. The present invention includes step 1: collecting state data of a continuous casting billet, step 2: processing the data, and step 3: using the optimization control model for the billet supply rhythm, and the step 3 includes using (1) a rolling possibility judgment threshold model for the continuous casting billet and (2) an optimization model for the billet supply rhythm to supply the billet from a small value to a large value according to the values ​​in the optimization matrix of the billet supply rhythm, and performing a billet removal operation on the continuous casting billet of the jth strand when the value of the jth strand in the optimization matrix of the billet supply rhythm is smaller than the billet removal threshold.

Description

[Technical field]

[0001] The present invention relates to the technical field of long section manufacturing, and more particularly to a method and system for optimizing and controlling the billet supply rhythm for directly rolling a high-temperature billet without heating it. [Background technology]

[0002] Direct rolling of the hot billet without heating refers to the direct rolling of the continuously cast billet into the rolling mill without the need for any online reheating device after the billet leaves the continuous caster. The rolling production efficiency when the hot billet is directly rolled without heating depends mainly on whether the temperature of the continuously cast billet arriving in front of the first rolling mill meets the minimum rolling temperature requirements of the rolling mill.

[0003] Conventionally, in the process of directly rolling a high-temperature billet without heating it, the transport rules of the continuous cast billet are not appropriate, especially in the case of a four-machine four-strand continuous casting system for one rolling line or a five-machine five-strand continuous casting system for one rolling line, so not only is the direct rolling rate of the high-temperature billet low, but the working efficiency of the rolling mill is also low.

[0004] The method for optimizing and controlling the billet supply rhythm for directly rolling a hot billet without heating according to the present invention includes collecting state data of the hot billet, collecting and processing transport data of the hot billet, and using an optimization control model for the billet supply rhythm, and has the advantage that the optimization algorithm for the billet supply rhythm is used to determine the optimal billet supply sequence to the rolling mill in the case of a three-machine three-strand continuous casting system for one rolling line, a four-machine four-strand continuous casting system for one rolling line, or a five-machine five-strand continuous casting system for one rolling line. This method can effectively improve the direct rolling ratio without requiring any online reheating device. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the problems of the background art, the present invention provides a method and system for optimizing control of billet supply rhythm for directly rolling a high-temperature billet without heating, which can solve the problem of the prior art that the direct rolling reduction rate is relatively low when directly rolling a high-temperature billet without heating. The present invention combines the optimization control model of the billet supply rhythm with the production process of directly rolling a high-temperature billet without heating, thereby expanding the application scope of the process of directly rolling a high-temperature billet without heating and improving the direct rolling reduction rate of the high-temperature billet. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following technical means. A method for optimizing and controlling a billet supply rhythm for directly rolling a high-temperature billet without heating, comprising the steps of:

[0007] TIFF2025513927000002.tif190168

[0008] Furthermore, in step 1, the collection of data includes the following: (1) Collecting temperature changes over time during the transportation process of the continuous cast billet: Using a handheld infrared thermometer, the temperature of the continuous cast billet is measured at different times and positions within the area from the exit of the secondary cooling area of ​​the continuous caster to just before the first rolling mill, and data on the temperature decrease over time of the continuously cast high-temperature billet is obtained. (2) Collection of velocity data: 1) Before cutting the continuous casting billet, the velocity data v of the continuous casting billet is collected. fc 2) Collect the billet withdrawal speed data of the continuous casting machine from the billet withdrawal speed data of the continuous casting machine after cutting the billet. bc from the rotation speed of the driving roller of the roll table; and 3) collecting velocity data v of the continuously cast billet from the end of the continuous caster to the first rolling mill. trans The speed data of the continuous casting billet is collected, including three parts: the speed of the driving roller of the rapid transport roll table; (3) Collection of billet demand signals from rolling mills: A hot metal detector is installed in front of the first rolling mill to measure whether the first rolling mill is rolling a high-temperature billet. If no hot metal is detected by the hot metal detector in front of the first rolling mill, it is determined that the first rolling mill is not rolling a high-temperature billet and is in a billet demand state. (4) Collect the time required for the first rolling mill to roll one continuous casting billet: The duration of hot metal t roll Detect.

[0009] Furthermore, the step 1 further includes the following: Collection of temperature data at specific positions: In order to check the change in temperature over time during the transportation process of the collected continuous cast billet, infrared thermometers are installed at the exit position of the secondary cooling area of ​​the continuous casting machine and at the end position of the continuous casting machine to measure the surface temperature data of the billet at the corresponding positions.

[0010] Furthermore, the step 2 includes the following steps: (1) Processing of temperature data during the transport process: The data of temperature decrease over time of the continuously cast high-temperature billet obtained in step 1 is subjected to data fitting using the data fitting method described below.

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[0011] The present invention further provides a billet feeding rhythm optimization control system for directly rolling a hot billet without heating, the system comprising: a data collection module, a data processing module, and a control module.

[0012] The data collection module includes: Infrared thermometers installed at the exit of the secondary cooling area of ​​the continuous caster and at the end of the continuous caster; Using a handheld infrared thermometer, measure the temperature in the area from the exit of the secondary cooling area of ​​the continuous caster to just before the first rolling mill; Collecting the speed of the continuously cast billet from the billet withdrawal speed of the continuous caster or the rotation speed of the drive rollers of the roll table; collecting billet demand signals of the rolling mills, and installing a hot metal detector in front of the first rolling mill to determine whether the first rolling mill is rolling a hot billet, and if no hot metal is detected by the hot metal detector in front of the first rolling mill, the first rolling mill is not rolling a hot billet and is in a billet demand state; and collecting the time required for a first rolling mill to roll one continuous cast billet, detecting the duration of hot metal with a hot metal detector at a position before the first rolling mill; The data processing module receives data including data on temperature change over time and speed data during the transportation process of the continuous casting billet from the data collection module, processes the data, and calculates the maximum time t that the continuous casting billet can wait when it reaches the end position of the continuous casting machine. max and the time it takes for the continuous cast billet to reach the first rolling mill from the end of the continuous caster, t trans The object is to obtain The control module calculates the data collected by the data collection module and the data acquired by the data processing module using the above-mentioned method, and optimizes and controls the billet supply rhythm for directly rolling the high-temperature billet without heating it. Effect of the Invention

[0013] The present invention has the following beneficial effects compared to the prior art: In the prior art, there is a problem that the direct rolling ratio when directly rolling a high-temperature billet without heating is relatively low. In contrast, the optimization control method for billet supply rhythm for directly rolling a high-temperature billet without heating according to the present invention can effectively improve the direct rolling ratio of the high-temperature billet, and is more suitable for use in the production practice of the process of directly rolling a high-temperature billet without heating.

[0014] The present invention can effectively reduce the billet removal rate of continuously cast high-temperature billets by using an optimization model of the billet supply rhythm and obtaining the appropriate sequence for transporting the continuously cast high-temperature billets to the rolling mill using the status data of the continuously cast billets. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a diagram showing a schematic diagram of an overall configuration for directly rolling a high-temperature billet without heating it. [Diagram 2] FIG. 2 is a schematic diagram showing an infrared thermometer of the present invention disposed at a specific position in a continuous casting machine. [Diagram 3] FIG. 2 is a diagram showing an optimization control system for billet supply rhythm for directly rolling a hot billet without heating according to the present invention.

[0016] In the figure, 1-mold, 2-secondary cooling area, 3-straightener, 4-cutting area, 5-end of continuous casting machine, 6-rapid transport roll table, 7-first rolling mill, 8-infrared thermometer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the overall configuration for directly rolling a hot billet without heating it. According to one embodiment of the present invention, a method for optimizing and controlling the billet feeding rhythm for directly rolling a hot billet without heating may include:

[0018] 1. Collecting data on the condition of continuous casting billets Four-machine, four-strand continuous caster and one rolling line produce HRB400E hot billets with size 150mm x 150mm x 10,000mm. (1) Collecting temperature changes over time during the transportation process of the continuous cast billet: Using a handheld infrared thermometer, the temperature of the continuous cast billet is measured at different times and positions within the area from the exit of the secondary cooling area 2 of the continuous casting machine to just before the first rolling machine 7, and data on the temperature decrease over time of the continuously cast high-temperature billet is obtained. (2) Collection of temperature data at specific positions: In order to check the change over time in temperature during the transportation process of the collected continuous cast billet, infrared thermometers 8 are installed at the exit position of the secondary cooling area 2 of the continuous casting machine and the end position 5 of the continuous casting machine to measure the surface temperature data of the billet at the corresponding positions, with the temperature measurement frequency being 10 times / s. FIG. 2 shows a schematic diagram of infrared thermometers 8 being placed at the exit position of the secondary cooling area 2 of the continuous casting machine and the end position 5 of the continuous casting machine. The measurement range of infrared thermometer 8 can be 800 to 1300°C. (3) Collection of velocity data: 1) Before cutting the continuous casting billet, the velocity data of the continuous casting billet v fc 2) Collect the billet withdrawal speed data of the continuous casting machine from the billet withdrawal speed data of the continuous casting machine after cutting the billet. bc from the rotation speed of the driving roller of the roll table; and 3) collecting speed data v of the continuous cast billet from the end 5 of the continuous caster to the first rolling mill 7. transand collecting speed data of the continuous casting billet, including three parts: from the rotation speed of the driving roller of the rapid transport roll table 6, and from the rotation speed of the driving roller of the rapid transport roll table 6. In this embodiment, the speed of the continuous casting billet before cutting is 2.6 m / min, the speed of the continuous casting billet after cutting is 5.2 m / min, and the average speed of the continuous casting billet from the end 5 of the continuous casting machine to the first rolling mill 7 is 120 m / min. (4) Collection of billet request signals from rolling mills: A hot metal detector is installed in front of the first rolling mill 7 to measure whether the first rolling mill is rolling a high-temperature billet. If no hot metal is detected by the hot metal detector in front of the first rolling mill 7, it is determined that the first rolling mill 7 is not rolling a high-temperature billet and is in a billet request state. (5) Collection of the time required for the first rolling mill 7 to roll one continuous casting billet: The duration of hot metal t roll In this embodiment, the duration t roll is 31s.

[0019] 2. Data processing (1) Processing of temperature data during the transfer process: The data of the temperature decrease over time of the continuously cast high-temperature billet obtained above is subjected to data fitting using the data fitting method of the following equation (1).

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[0020] TIFF2025513927000005.tif87168

[0021] (2) Optimization model for billet supply rhythm When a billet request signal is transmitted from the rolling mill, the continuous casting machine starts to judge the continuous cast billets one by one at the end 5 of the continuous casting machine using the judgment model of the following formula (5):

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[0022] The billet supply sequence is such that the billets are supplied from small to large according to the values ​​in the optimization matrix of the billet supply rhythm, and the value of the j-th strand in the optimization matrix of the billet supply rhythm is M jy < Ft In the case of (Equation (6)), a billet removal operation is performed on the continuously cast billet of the jth strand.

[0023] In the present invention, surface oxide scale of the continuously cast high-temperature billet is removed at the exit position of the secondary cooling area 2 of the continuous casting machine and at the end position 5 of the continuous casting machine. Surface oxide scale of the continuously cast high-temperature billet is removed at different times and positions within the region from the exit of the secondary cooling area 2 of the continuous casting machine to just before the first rolling mill 7.

[0024] The present invention further provides an optimization control system for a billet supply rhythm for directly rolling a hot billet without heating. Figure 3 according to one embodiment of the present invention shows the configuration of an optimization control system for a billet supply rhythm for directly rolling a hot billet without heating, which includes a data collection module, a data processing module, and a control module.

[0025] The data collection module is responsible for: (1) Infrared thermometers 8 installed at the exit of the secondary cooling area 2 of the continuous casting machine and at the end 5 of the continuous casting machine; (2) measuring the temperature in the area from the exit of the secondary cooling area 2 of the continuous caster to just before the first rolling mill 7 using a handheld infrared thermometer; (3) Collecting the speed of the continuously cast billet from the billet withdrawal speed of the continuous caster or the rotation speed of the drive rollers of the roll table; (4) collecting billet demand signals from the rolling mills, and installing a hot metal detector in front of the first rolling mill 7 to measure whether the first rolling mill 7 is rolling a hot billet, and if no hot metal is detected by the hot metal detector in front of the first rolling mill 7, the first rolling mill 7 is not rolling a hot billet and is in a billet demand state; and (5) Collecting the time required for the first rolling mill 7 to roll one continuous cast billet, and detecting the duration of hot metal by a hot metal detector located before the first rolling mill 7.

[0026] The data processing module receives data including data on temperature change over time and speed data during the transportation process of the continuous casting billet from the data collection module, processes the data, and calculates the maximum time t that the continuous casting billet can wait when it reaches the terminal 5 position of the continuous casting machine. max and the time it takes for the continuous cast billet to reach the first rolling mill 7 from the end 5 of the continuous caster t trans The purpose is to obtain the following.

[0027] The control module calculates the data collected by the data collection module and the data acquired by the data processing module using the above-mentioned method, and optimizes and controls the billet supply rhythm for directly rolling the high-temperature billet without heating it.

[0028] As can be seen from the above technical solutions, the prior art has the problem that the direct rolling ratio when directly rolling a high-temperature billet without heating is relatively low. In contrast, the method and system for optimizing control of billet supply rhythm for directly rolling a high-temperature billet without heating according to the present invention can effectively improve the direct rolling ratio of the high-temperature billet, and is more suitable for use in the production practice of the process of directly rolling a high-temperature billet without heating.

[0029] The above-mentioned embodiments are implemented based on the technical means of the present invention, and provide detailed embodiments and specific operation procedures, but do not limit the scope of protection of the present invention. The methods used in the above-mentioned embodiments are conventional methods unless otherwise specified.

Claims

【Request 1】

2. The method for optimizing and controlling the billet supply rhythm for directly rolling a hot billet without heating, as claimed in claim 1, characterized in that in step 1, the data collection includes: (1) Collecting temperature changes over time during the transportation process of the continuous cast billet: Using a handheld infrared thermometer, the temperature of the continuous cast billet is measured at different times and positions within the area from the exit of the secondary cooling area of ​​the continuous caster to just before the first rolling mill, and data on the temperature decrease over time of the continuously cast high-temperature billet is obtained. (2) Collection of velocity data: 1) Before cutting the continuous casting billet, the velocity data v of the continuous casting billet is collected. fc from the billet withdrawal speed of the continuous casting machine; 2) after cutting the continuous casting billet, the speed data v of the continuous casting billet is collected. bc from the rotation speed of the driving roller of the roll table; and 3) collecting velocity data v of the continuously cast billet from the end of the continuous caster to the first rolling mill. trans from the rotational speed of the drive rollers of the rapid transport roll table. (3) Collecting billet demand signals from rolling mills: A hot metal detector is installed in front of the first rolling mill to measure whether the first rolling mill is rolling a high-temperature billet. If no hot metal is detected by the hot metal detector in front of the first rolling mill, it is determined that the first rolling mill is not rolling a high-temperature billet and is in a billet demand state. (4) Collecting the time required for the first rolling mill to roll one continuous casting billet: The duration of hot metal t roll Detect.

3. 3. The method for optimizing and controlling the billet supply rhythm for directly rolling a hot billet without heating as claimed in claim 2, wherein step 1 further comprises: Collection of temperature data at specific positions: In order to check the change in temperature over time during the transportation process of the collected continuous cast billet, infrared thermometers are installed at the exit position of the secondary cooling area of ​​the continuous casting machine and at the end position of the continuous casting machine to measure the surface temperature data of the billet at the corresponding positions.

4. 2. The method for optimizing and controlling a billet supply rhythm for directly rolling a hot billet without heating as claimed in claim 1, wherein step 2 comprises the following steps: (1) Processing of temperature data during transportation: The data of temperature decrease over time of the continuously cast high-temperature billet obtained in step 1 is subjected to data fitting using the following data fitting method. [0010] "Where, T(t) is the surface temperature of the hot billet at different times, and a i (i=0,1,2,3,…,n) are polynomial weighting coefficients and t is time.” (2) The minimum temperature T at which rolling can be performed by a rolling mill min Decide. (3) Velocity data of the continuous casting billet before cutting v fc The time required for the tail of the continuous casting billet to reach the cutting position is t fc Get the. (4) Velocity data of the continuous casting billet after cutting v bc The time required for the head of the continuous casting billet to reach the end of the continuous casting machine, t bc Get the. (5) Velocity data of the continuous cast billet from the end of the continuous caster to the first rolling mill v trans The time required for the continuous cast billet to reach the first rolling mill from the end of the continuous caster is t trans Get the. (6) Based on the fitted temperature-time curve, the temperature value T of the continuous casting billet that has reached the end position of the continuous casting machine is determined. cf = T(t fc + t bc )(t fc is the time required for the tail of the continuous casting billet to reach the cutting position, and t bc is the time required for the head of the continuous casting billet to reach the end of the continuous casting machine after cutting.) From this, the maximum time that the continuous casting billet can wait when it reaches the end position of the continuous casting machine, t max (That is, the billet temperature is T cf From T min The time required for the temperature to drop to 100°C is then determined.

5. A data collection module, a data processing module, and a control module, The data collection module includes: Infrared thermometers installed at the exit of the secondary cooling area of ​​the continuous caster and at the end of the continuous caster; Using a handheld infrared thermometer, measure the temperature in the area from the exit of the secondary cooling area of ​​the continuous caster to just before the first rolling mill; Collecting the speed of the continuously cast billet from the billet withdrawal speed of the continuous caster or the rotation speed of the drive rollers of the roll table; collecting billet demand signals of the rolling mills, and installing a hot metal detector in front of the first rolling mill to determine whether the first rolling mill is rolling a hot billet, and if no hot metal is detected by the hot metal detector in front of the first rolling mill, the first rolling mill is not rolling a hot billet and is in a billet demand state; and collecting the time required for a first rolling mill to roll one continuous cast billet, detecting the duration of hot metal with a hot metal detector at a position before the first rolling mill; The data processing module receives data including data on temperature change over time and speed data during the transportation process of the continuous casting billet from the data collection module, processes the data, and calculates the maximum time t that the continuous casting billet can wait when it reaches the end position of the continuous casting machine. max and the time it takes for the continuous cast billet to reach the first rolling mill from the end of the continuous caster, t trans The object is to obtain 2. The optimization control system for a billet supply rhythm for directly rolling a high-temperature billet without heating, wherein the control module calculates the data collected by the data collection module and the data acquired by the data processing module according to the method of claim 1, and optimizes and controls the billet supply rhythm for directly rolling the high-temperature billet without heating it.

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