Method and system for optimizing control of billet supply rhythm for direct rolling of high-temperature billets 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 hot billets without heating refers to the process in which a continuously cast billet directly enters a rolling mill after leaving a continuous caster without the need for any online reheating equipment. The rolling production efficiency when directly rolling hot billets without heating them mainly depends on whether the temperature of the continuously cast billet arriving just before the first rolling mill meets the minimum rolling temperature requirements of the rolling mill.

[0003] In the conventional process of directly rolling a high-temperature billet without heating it, the transport rules for the continuous cast billet are inappropriate, which not only results in a low direct rolling rate for the high-temperature billet but also in low operating efficiency for the rolling mill, 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.

[0004] The method for optimizing and controlling the billet supply rhythm for direct rolling of hot billets without heating according to the present invention includes collecting data on the state of the hot billets, collecting and processing data on the transportation of the hot billets, and using an optimization control model for the billet supply rhythm. The method has the advantage of using an optimization algorithm for the billet supply rhythm to determine the optimal billet supply sequence to the rolling mills 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 equipment. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the problems of the related art, the present invention provides a method and system for optimizing control of billet supply rhythm for direct rolling of hot billets without heating, thereby solving the problem of the prior art that the direct rolling reduction rate is relatively low when directly rolling hot billets without heating.By combining the billet supply rhythm optimization control model with the production process of directly rolling hot billets without heating, the present invention can expand the application range of the process of directly rolling hot billets without heating and improve the direct rolling reduction rate of hot billets. [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 the billet supply rhythm for directly rolling a high-temperature billet without heating, comprising the steps of:

[0007] TIFF0007789232000001.tif190168

[0008] Furthermore, in step 1, the collection of data includes the following: (1) Collecting temperature changes over time during the transportation process of continuously cast billets: Using a handheld infrared thermometer, the temperature of the continuously cast billets is measured at different times and positions within the area from the exit of the secondary cooling area of ​​the continuous casting machine to just before the first rolling mill, and data on the temperature decrease over time of the continuously cast high-temperature billets is obtained. (2) Collection of velocity data: 1) Before cutting the continuous casting billet, velocity data v of the continuous casting billet fc 2) After cutting the continuous casting billet, the speed data of the continuous casting billet v bc from the rotation speed of the drive roller of the roll table, and 3) the 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 request 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 request state. (4) Collection of 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 temperature changes over time during the transport 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 on the 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.

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[0011] The present invention further provides a billet supply rhythm optimization control system for directly rolling a hot billet without heating, which includes a data collection module, a data processing module, and a control module.

[0012] The data collection module includes: Infrared thermometers installed at the outlet 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 roller of the roll table; collecting billet demand signals from 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, determining that 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, and detecting the duration of the hot metal by a hot metal detector located before the first rolling mill; The data processing module receives data including data on temperature change over time and speed data during the transport 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 and 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. [Effects of the Invention]

[0013] The present invention has the following advantageous 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 method for optimizing and controlling the 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 for the billet supply rhythm and by using status data of the continuously cast billets to obtain the appropriate order in which the continuously cast high-temperature billets are transported to the rolling mill. [Brief explanation of the drawings]

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

[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 high-temperature 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 it may include the following.

[0018] 1. Collecting data on the condition of continuous casting billets Four continuous casters with four strands each will produce HRB400E hot billets measuring 150mm x 150mm x 10,000mm. (1) Collecting temperature changes over time during the transportation process of the continuously cast billet: Using a handheld infrared thermometer, the temperature of the continuously 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 mill 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 temperature change over time during the transport process of the collected continuously cast billet, infrared thermometers 8 are installed 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 to measure the surface temperature data of the billet at the corresponding positions, with the temperature measurement frequency being 10 times / s. Figure 2 shows a schematic diagram of infrared thermometers 8 being installed 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. 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, velocity data v of the continuous casting billet fc 2) After cutting the continuous casting billet, the speed data of the continuous casting billet v bc from the rotation speed of the drive roller of the roll table; and 3) collecting speed data v of the continuously cast billet from the end 5 of the continuous casting machine to the first rolling mill 7. transThe speed data of the continuously cast billet is collected, including three parts: the speed of the continuous cast billet before cutting, the speed of the continuous cast billet after cutting, and the speed of the continuous cast billet after cutting, and the average speed of the continuous cast billet from the end 5 of the continuous caster 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 t of the hot metal detected by a hot metal detector located before the first rolling mill 7 roll In this embodiment, the duration t roll is 31s.

[0019] 2. Data processing (1) Processing of temperature data during the transport 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] TIFF0007789232000004.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 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)), the billet removal operation is performed on the continuously cast billet of the jth strand.

[0023] In the present invention, surface oxide scale is removed from continuously cast high-temperature billets 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 is removed from continuously cast high-temperature billets 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 a system for optimizing control of a billet supply rhythm for directly rolling a hot billet without heating it. Fig. 3 according to one embodiment of the present invention shows the configuration of a system for optimizing control of a billet supply rhythm for directly rolling a hot billet without heating it, 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) Using a handheld infrared thermometer, measure 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; (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 determine 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, determining that 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 the 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 transport 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 5 position of the continuous casting machine. max and the time t required for the continuous cast billet to reach the first rolling mill 7 from the end of the continuous caster 5. 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 rate when directly rolling a hot billet without heating it is relatively low, whereas the method and system for optimizing control of billet supply rhythm for directly rolling a hot billet without heating it according to the present invention can effectively improve the direct rolling rate of the hot billet and is more suitable for use in the production practice of the process of directly rolling a hot billet without heating it.

[0029] The above-described embodiments are implemented based on the technical solutions 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-described embodiments are conventional methods unless otherwise specified.

Claims

【Request Item 1】

2. 2. The method for optimizing and controlling the billet supply rhythm for direct rolling of a hot billet without heating, according to claim 1, characterized in that in step 1, the data collection includes: (1) Collecting temperature changes over time during the transportation process of the continuously cast billet: Using a handheld infrared thermometer, the temperature of the continuously cast billet is measured at different times and positions within the area from the exit of the secondary cooling area of ​​the continuous casting machine 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, velocity data v of the continuous casting billet is collected. fc 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 drive 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 determine 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) Collection of the time required for the first rolling mill to roll one continuous casting billet: The duration of the 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, according to claim 2, wherein step 1 further comprises: Collection of temperature data at specific positions: In order to check the temperature changes 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 the billet supply rhythm for directly rolling a hot billet without heating, according to claim 1, wherein step 2 comprises the following steps: (1) Processing of temperature data during the transport process: The data of the 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. [Equation 1] "Where T(t) is the surface temperature of the hot billet at different times, a i (i=0,1,2,3,...,n) are polynomial weighting coefficients and t is time. (2) The minimum temperature T at which rolling is possible by the rolling mill min Decide. (3) Velocity data v of the continuous casting billet before cutting the continuous casting billet fc The time required for the tail of the continuous casting billet to reach the cutting position is t fc Get. (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. (5) Velocity data v of the continuously cast billet from the end of the continuous caster to the first rolling mill 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. (6) Based on the fitted temperature-time curve, the temperature value T of the continuously cast billet that has reached the end position of the continuous casting machine is calculated. 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 (i.e., the billet temperature is T cf From T min The time required for the temperature to drop to

5. a data collection module, a data processing module, and a control module; The data collection module includes: Infrared thermometers installed at the outlet 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 roller of the roll table; collecting billet demand signals from 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, determining that 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, and detecting the duration of the hot metal by 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 transport 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 and 10. 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 using 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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