CN111215457A - Method and device for controlling cooling of medium plate after rolling and electronic equipment - Google Patents
Method and device for controlling cooling of medium plate after rolling and electronic equipment Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
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Abstract
The application provides a method and a device for controlling cooling of a medium plate after rolling and an electronic device, wherein the method comprises the following steps: carrying out first-stage cooling operation on the target rolled steel plate according to the set cooling parameters; calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate; determining current cooling parameters according to the final cooling temperature of the first stage; and carrying out second-stage cooling operation on the target steel plate according to the current cooling parameters.
Description
Technical Field
The application relates to the technical field of steel rolling control, in particular to a method and a device for controlling cooling of a medium plate after rolling and electronic equipment.
Background
In the production process of the medium plate, the controlled cooling process after rolling refers to controlling the cooling speed and the cooling temperature of rolled steel, and different cooling paths are adopted to regulate and control the structure and the performance of the steel. In order to realize automation of the cooling process control, the current practice is to determine the cooling regulation according to various state data of the steel plate, detected cooling temperature, water temperature of cooling water and other data.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a method and an apparatus for controlling cooling of a medium plate after rolling, and an electronic device. The effect of improving the temperature regulation of the steel plate can be achieved.
In a first aspect, an embodiment provides a method for controlling cooling of a medium plate after rolling, including:
carrying out first-stage cooling operation on the target steel plate according to the set cooling parameters;
calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate;
determining current cooling parameters according to the first-stage final cooling temperature;
and carrying out second-stage cooling operation on the target steel plate according to the current cooling parameters.
In an alternative embodiment, the step of determining the current cooling parameter according to the first-stage final cooling temperature includes:
and if the first-stage final cooling temperature is greater than the target re-reddening temperature, determining the current cooling parameters according to the first-stage final cooling temperature and the target re-reddening temperature.
The method for controlling cooling of the rolled medium plate comprises a first stage of controlling cooling within a phase transition temperature range from the completion of rolling to the occurrence of phase transition, a steel plate enters a cooling zone to be cooled as soon as possible after the rolling in the first stage, precipitation amount of pro-eutectoid ferrite of the steel plate is reduced, follow-up coarse grains are avoided, meanwhile, a sufficiently large cooling speed is guaranteed during cooling, the structural state of deformed austenite is controlled, the steel plate rapidly passes through an austenite region, recrystallization does not occur, growth of austenite grains is prevented, phase transition driving force is increased, cooling in a second stage is a phase transition process of the controlled steel plate, a cooling control process is formulated according to different structures and process performance requirements required by the steel plate, and the required metallographic structure and mechanical property are obtained after the steel plate is rapidly cooled. Thereby achieving effective cooling of the steel sheet.
In an optional embodiment, if the first-stage final cooling temperature is greater than the target temperature of red-back, the step of determining the current cooling parameter according to the first-stage final cooling temperature and the target temperature of red-back includes:
if the final cooling temperature of the first stage is higher than the target re-reddening temperature, determining corresponding multi-class cooling rates according to the steel plate parameters of the target steel plate and various cooling water flows;
determining a target cooling rate according to the target temperature of the red return;
determining the required water flow according to the target cooling rate and the multiple types of cooling rates;
and determining the current cooling parameters according to the required water flow, wherein the current cooling parameters comprise at least one of the opening number of the cooling headers, the water flow of each cooling header, the speed of the roller way and the acceleration of the roller way.
The cooling control method for the rolled medium plate can determine appropriate cooling parameters by combining the parameters of each cooling device, so that the steel plate can be stably cooled.
In an alternative embodiment, the method further comprises:
in the second-stage cooling operation process, acquiring real-time cooling parameters, speed change data of a roller way and state parameters of the target steel plate according to a preset time period;
and calculating the cooling rate of the target steel plate in the second stage cooling operation process according to the real-time cooling parameters, the speed change data of the roller way and the state parameters of the target steel plate.
The method for controlling cooling of the medium plate after rolling provided by the embodiment of the application can be used for counting the cooling of the second stage, so that the cooling state of the second stage can be conveniently known.
In an alternative embodiment, the step of determining the current cooling parameter according to the first-stage final cooling temperature includes:
and if the final cooling temperature of the first stage is less than the target return red temperature, adjusting the set cooling parameter to obtain the current cooling parameter.
The method for controlling cooling of the rolled medium plate can be used for finely adjusting the set cooling parameters when the final cooling temperature of the first stage is lower than the target re-reddening temperature, so that the steel plate can reach the required target re-reddening temperature through simple adjustment.
In an optional embodiment, the step of calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameter and the steel plate parameter of the target steel plate includes:
calculating physical property parameters of the target steel plate according to the steel plate parameters of the target steel plate;
calculating the temperature field of the target steel plate according to the physical property parameters and the set cooling parameters;
and determining the first-stage final cooling temperature of the target steel plate according to the temperature field.
According to the method for controlling cooling of the medium plate after rolling, the final cooling temperature of the first stage is calculated according to the data of the steel plate, and the temperature detected by the detection element is more accurate, so that a data basis can be provided for determining the cooling parameters of the second stage.
In an alternative embodiment, before the step of performing the first-stage cooling operation on the target steel sheet according to the set cooling parameters, the method further includes:
and determining the set cooling parameters corresponding to the target steel plate according to the model of the target steel plate.
According to the cooling control method for the rolled medium plate, a fixed set cooling parameter is determined for different types of steel plates, and therefore the method in the embodiment of the application can meet the cooling requirements of different steel plates.
In a second aspect, an embodiment provides a device for controlling cooling after rolling of a medium plate, including:
the first cooling module is used for carrying out first-stage cooling operation on the target steel plate according to the set cooling parameters;
the first calculation module is used for calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate;
the first determining module is used for determining the current cooling parameters according to the first-stage final cooling temperature;
and the second cooling module is used for carrying out second-stage cooling operation on the target steel plate according to the current cooling parameters.
In a third aspect, an embodiment provides an electronic device, including: a processor, a memory storing machine readable instructions executable by the processor, the machine readable instructions when executed by the processor perform the steps of the method of any of the preceding embodiments when the electronic device is run.
In a fourth aspect, embodiments provide a computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to perform the steps of the method according to any of the previous embodiments.
The method, the device, the electronic equipment and the computer readable storage medium for controlling cooling of the rolled medium plate have the advantages that the set cooling parameters are adopted in the first stage, the initial speed of a roller way, the header water amount, the opening mode and the like in the ultra-fast cooling process are fixed, the steel plate can be enabled to enter a cooling area at a higher speed after being rolled, and the cooling speed is enough at the beginning of water cooling, so that the time from the rolling of the steel plate to the beginning of water cooling can be reduced, the cooling speed is higher in the water cooling process, the precipitation amount of the eutectoid ferrite of the steel plate is reduced, follow-up coarse grains are avoided, the steel plate can rapidly pass through an austenite area, recrystallization does not occur, or the amount or degree of partial recrystallization is kept consistent. The final cooling temperature difference of the steel plate after the first stage cooling is small, the cooling speed difference caused by the cooling parameters determined when the steel plate enters the second stage is small, the mechanical property difference of the final steel plate can be reduced, the shape stability after cooling can be improved, and the effects of improving the production stability and the performance stability of the steel plate are achieved.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a block diagram of an electronic device according to an embodiment of the present disclosure.
Fig. 2 is a flowchart of a method for controlling cooling after rolling of a medium plate according to an embodiment of the present application.
Fig. 3 is a detailed flowchart of step 203 of the method for controlling cooling after rolling a medium plate according to the embodiment of the present application.
Fig. 4 is a functional block schematic diagram of a device for controlling cooling after rolling of a medium plate according to an embodiment of the present application.
Detailed Description
The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the field of medium plate production, cooling control of a rolled steel plate is required. In one implementation, the cooling regulation in the full-automatic cooling mode of the control cooling system is a key part, and the cooling regulation depends on the calculation rationality of a cooling model, and influences the output quantity (cooling water quantity, passing speed, cooling rate and the like) of the automatic cooling control system, so that the structure performance and the shape quality of the steel plate after being cooled are directly influenced.
In one implementation mode, a cooling regulation of the medium plate control cooling system is calculated by a cooling model, the cooling model determines parameters required by the cooling regulation according to the obtained state data, the starting cooling temperature and the water temperature of the steel plate, a basic cooling regulation in a prestored table is called, the cooling model calculates the correction amount of each parameter in the basic cooling regulation through a mathematical model based on the average cooling speed requirement and the final cooling temperature of the process requirement, and each parameter of the corrected basic cooling regulation is sent to the cooling system for execution.
The inventor of the application researches the mode, and the mode has the following defects that the cooling rule directly calculated by a cooling model is relatively discrete, the consistency of the cooling speed of a rolled piece at different stages is not good, and the stability of the performance of a steel plate is influenced; secondly, the red return phenomenon may exist after the thick-specification rolled piece is cooled, and the hit rate of the red return temperature is affected by the dispersion of the cooling regulations, so that the performance change of the steel plate is large.
The controlled cooling after the medium plate is rolled is a very complicated process, and the controlled cooling system is provided with a cooling model and has a perfect automatic control level. However, because the uncertain factors of the on-site working conditions are more, the cooling model may not be able to set the cooling mode according to the individual requirements of part of the variety production, especially along with the fluctuation of the temperature after the steel plate is rolled and the change of the water temperature, the factors of the residual water existing on the water-cooled front surface of the steel plate, the composition and the state of the iron scale on the surface of the steel plate and the like cause temperature measurement distortion, the cooling rule output after the calculation of the cooling model is relatively discrete directly or indirectly, especially when the cooling speed of the steel plate is required to be controlled in stages in the cooling process, the characteristics that the fluctuation of the cooling speed is obvious in different stages of the cooling process and the stability requirement of the product quality control is obviously caused because the cooling model only randomly adjusts the water quantity of a header, the opening mode, the roller speed and.
For thick steel plates, the phenomenon of red return after cooling inevitably exists, the cooling rule calculated by a cooling model is relatively discrete, and particularly when the opening mode of a quick-cooling section header and the water quantity change of the header are large, the red return temperature after cooling of the steel plates measured by a pyrometer used for post-calculation is large in difference, so that the calculation result difference of a self-learning model is large, the red return temperature of different steel plates is frequently fluctuated finally, and the fluctuation of the performance of the final product is large.
In view of the above research, embodiments of the present application provide a method, an apparatus, and an electronic device for controlled cooling of a rolled steel plate, where the steel plate is cooled in two stages, and first, the steel plate is rapidly cooled by a fixed cooling schedule in a first stage; and then parameters such as the flow rate of the second-stage collecting pipe, the opening mode of the collecting pipe and the like are calculated according to the cooling model according to the requirement of the final cooling temperature, and the cooling regulation is output according to the calculation result, so that the problems can be solved, and the performance stability of the steel plate is improved during continuous production. The detailed procedure of the above method is described below by way of a few examples.
Example one
For the convenience of understanding the present embodiment, the electronic device for performing the method for controlling cooling after rolling of the medium plate disclosed in the embodiments of the present application will be described in detail first.
As shown in fig. 1, is a block schematic diagram of an electronic device. The electronic device 100 may include a memory 111, a memory controller 112, a processor 113, a peripheral interface 114, an input-output unit 115, and a display unit 116. It will be understood by those of ordinary skill in the art that the structure shown in fig. 1 is merely exemplary and is not intended to limit the structure of the electronic device 100. For example, electronic device 100 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
The above-mentioned elements of the memory 111, the memory controller 112, the processor 113, the peripheral interface 114, the input/output unit 115 and the display unit 116 are electrically connected to each other directly or indirectly, so as to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 113 is used to execute the executable modules stored in the memory.
The Memory 111 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 111 is configured to store a program, and the processor 113 executes the program after receiving an execution instruction, and the method executed by the electronic device 100 defined by the process disclosed in any embodiment of the present application may be applied to the processor 113, or implemented by the processor 113.
The processor 113 may be an integrated circuit chip having signal processing capability. The Processor 113 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 114 couples various input/output devices to the processor 113 and memory 111. In some embodiments, the peripheral interface 114, the processor 113, and the memory controller 112 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The input/output unit 115 is used to provide input data to the user. The input/output unit 115 may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 116 provides an interactive interface (e.g., a user operation interface) between the electronic device 100 and the user or is used for displaying image data to the user for reference. In this embodiment, the display unit may be a liquid crystal display or a touch display. In the case of a touch display, the display can be a capacitive touch screen or a resistive touch screen, which supports single-point and multi-point touch operations. The support of single-point and multi-point touch operations means that the touch display can sense touch operations simultaneously generated from one or more positions on the touch display, and the sensed touch operations are sent to the processor for calculation and processing. In this embodiment, the display unit 116 may be used to display the variation trend of various status data of the steel plate during the cooling process.
In one example, the cooling device portion of a controlled cooling system in a production line is twenty-four sets of nozzles in two zones, where the first zone is the fast cooling section, the first four sets are slot nozzles, and the last eight sets are high density nozzles. The second zone is a slow cooling section and consists of twelve groups of high-density nozzles. Thus, laminar cooling and ultra-fast cooling functions can be realized, and online control cooling and online quenching heat treatment can be realized.
In this embodiment, a control program is installed in the electronic device, and the control program may control the cooling system to be equipped with a full-automatic cooling control system. After rolling, the steel plate enters a first area, the cooling device is controlled to work by setting cooling parameters, then the cooling parameters are output after calculation by a cooling model of the full-automatic cooling control system, the cooling parameters can comprise control parameters such as the number of open headers, the distribution of the open headers, the water quantity of each group of headers, the water flow ratio of the upper header to the lower header, the roller speed, the roller acceleration and the like, and the calculation result is sent to a basic automatic system for execution. The basic automation system is used to control the various components in the cooling device to achieve cooling control. Illustratively, the cooling model of the full-automatic cooling control system comprises mathematical models such as a temperature field calculation model, a self-learning model, a heat exchange coefficient calculation model and a phase change latent heat calculation model. The temperature of the target steel plate is calculated through the models, so that the required cooling parameters can be determined according to the temperature. Alternatively, the temperature field calculation model, the self-learning model, the heat exchange coefficient calculation model, and the latent heat of phase change calculation model may be software programs stored in the memory 111 and executed by the processor 113.
The electronic device 100 in this embodiment may be configured to perform each step in each method provided in this embodiment. The following describes the implementation process of the controlled cooling method after rolling the medium plate in detail through several embodiments.
Example one
Please refer to fig. 2, which is a flowchart illustrating a method for controlling cooling after rolling a medium plate according to an embodiment of the present application. The specific process shown in fig. 2 will be described in detail below.
And step 201, performing a first-stage cooling operation on the target steel plate according to the set cooling parameters.
Due to the different parameters of the size, thickness and the like of different types of steel plates, the cooling parameters of the first stage of different individuals can be needed. Based on this, in this embodiment, before step 201, the method for controlling cooling after rolling a medium plate further includes: and determining the set cooling parameters corresponding to the target steel plate according to the model of the target steel plate.
Alternatively, the set cooling parameters may be determined from historical cooling data. For example, in the case of a target type of steel plate, the cooling parameter corresponding to the time when the stability of the target type of steel plate is best manufactured within a specified time period may be used as the set cooling parameter of the target type of steel plate.
Alternatively, it is also possible to acquire the preset cooling parameters required for each model of the steel plate that is prestored.
Alternatively, the set cooling parameter may be a cooling parameter set by the relevant process personnel. For example, the set cooling parameters corresponding to each type of steel plate may be stored in a table, and the set cooling parameters may be obtained by acquiring data in the table. For example, the set cooling parameters corresponding to each type of steel plate may be stored in a CSV (Comma-Separated Values) table.
In this embodiment, step 201 is used to realize cooling of the steel plate within the range from the rolling completion temperature to the transformation occurrence temperature. Illustratively, the target steel plate can enter the fixed cooling of step 201 as soon as possible after the rolling is completed, so that the precipitation amount of the pro-eutectoid ferrite of the steel plate can be reduced, the subsequent coarse grains can be avoided, meanwhile, a sufficient cooling rate is ensured during cooling, the structural state of the deformed austenite is controlled, the steel plate rapidly passes through an austenite region, recrystallization does not occur, the growth of austenite grains is prevented, and the phase transformation driving force is increased.
In this example, the target steel sheet is cooled in the first stage by the fixed set cooling parameters. The initial speed of the roller way in the ultra-fast cooling process, the header water quantity, the opening mode and the like are fixed, the steel plate can be ensured to enter a cooling area at a higher speed after being rolled, and the cooling speed is enough at the beginning of water cooling, so that the time from the rolling of the steel plate to the beginning of water cooling can be reduced, and the larger cooling speed is realized in the water cooling process, thereby reducing the precipitation amount of the eutectoid ferrite of the steel plate and avoiding the coarseness of follow-up grains, the steel plate can rapidly pass through an austenite area, recrystallization does not occur, or the amount or degree of partial recrystallization is kept consistent. If the steel plate is subjected to phase change during the A section cooling, the structural state and the grain size of the steel plate are consistent in the phase change process due to the fixation of the cooling rule.
In one example, a reduced low alloy steel plate Q390B/C with a thickness of 40mm was calculated using the novel cooling schedule of the method of the examples of this application.
In the embodiment, in order to enable the target steel plate to enter the cooling mode as soon as possible, the speed of the roller way is relatively accelerated, the collecting pipes are opened in a relatively dense opening mode, a certain interval is provided for opening the collecting pipes in the rapid cooling process, and water quantity control is comprehensively considered according to the equipment capacity, the final red returning temperature, the product performance and the production line process characteristics.
For example, the first stage set cooling parameters of the reduced low alloy steel plate Q390B/C with the thickness of the medium plate line of 40mm can be as follows:
by using the above embodiment effect 1: the reduced low-alloy steel plate Q390B/C with the thickness of 40mm has the yield strength CPK (Process capability index) index improved from 0.98 to 1.35, the tensile strength CPK index improved from 1.12 to 1.43 and the elongation CPK index improved from 0.83 to 1.21.
And 202, calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate.
In the present example, the first-stage final cooling temperature after the first-stage cooling of the steel sheet can be calculated from physical property parameters such as specific heat, thermal conductivity, and density, the chemical composition of the steel sheet, the final rolling temperature, the number of cooling header openings, the water flow rate per cooling header, and the steel sheet running speed, by using a physical property parameter model and a temperature analysis model involved in the cooling process, and boundary conditions thereof.
Optionally, step 202 comprises: calculating physical property parameters of the target steel plate according to the steel plate parameters of the target steel plate; calculating the temperature field of the target steel plate according to the physical property parameters and the set cooling parameters; and determining the first-stage final cooling temperature of the target steel plate according to the temperature field.
Alternatively, physical properties such as a thermal conductivity, a heat transfer coefficient, and a specific heat are determined according to the composition, size, initial temperature, cooling method, and the like of the target steel sheet. And according to the target process requirement, carrying out meshing on the thickness, calculating a reasonable step length, and solving by using a finite element difference method to obtain a steel plate temperature field.
For example, the temperature field may be calculated using the third type of boundary conditions and initial conditions of the thermal conductivity differential equation. For example, the third type of boundary condition in this example may represent the temperature T of the fluid medium in contact with the target steel sheetfAnd heat transfer coefficient α, expressed as:
wherein k represents a corrected value of the air-cooling heat exchange coefficient, α and TfEither constant or some function of time and position if α is compared with TfIf not, the average value is taken as a constant in the numerical calculation.
Wherein the initial condition is that the temperature distribution in the entire region of the target steel sheet at the start of the process is known, and the formula is expressed as:
T|t＝0＝T0(ii) a Or,
wherein, T0Is a known constant, indicating that the initial temperature of the target steel sheet is uniform in units of: DEG C;
represents a known function, representing that the initial temperature of the object is not uniform, in units of: DEG C.
The whole temperature field distribution can be solved and analyzed by combining the temperature field equation and the third boundary condition and the initial condition, and the third type boundary condition is applicable to the cooling process of the medium plate. In summary, the heat conduction differential equation, the third type of boundary conditions and the initial conditions described above indicate that the key to solve the equation is to determine the physical parameters such as the heat conductivity coefficient, the heat transfer coefficient, the specific heat and the density.
For example, the thermal conductivity can be obtained by a segmented interpolation method according to the known measured thermal conductivity of different steel types at different temperatures.
For example, the specific heat can be obtained by performing linear interpolation according to the chemical composition of the steel plate and a temperature look-up table to obtain the specific heat capacity of the current steel plate.
Illustratively, since the density does not change much when the temperature of the steel sheet is changed within the range of 0 to 1200 ℃, the density is considered to be a constant, 7850kg/m 3.
Exemplarily, the heat loss of the convective heat transfer of the steel plate to the surrounding air is mainly due to the contact of the surface of the steel plate and the air. Therefore, the heat transfer coefficient can be calculated by the following formula:
in the formula, k represents a corrected value of the air cooling heat exchange coefficient; t, TαRespectively representing the surface temperature of the rolled steel plate and the ambient air temperature; sigma represents the blackness (sigma is less than or equal to 1) of the target steel plate, the value of the medium and thick plates is determined according to different degrees of surface iron scale, the value of the medium and thick plates can be 0.8 when the surface iron scale is more, and the value of the medium and thick plates can be 0.5-0.7 when the steel plate is just rolled or the plane of the related steel grade is smoother.
In the calculation process of the temperature field of steel plate cooling, the water-cooling convective heat transfer coefficient is a very critical parameter, and has a determining influence on the accuracy of a cooling model. The water cooling heat exchange coefficient is mainly related to factors such as water flow density, surface temperature of steel plates, steel grades and the like, and is an important parameter which is complex and difficult to determine [33,34 ]. Based on the field process control model, in a certain temperature range (above 500 ℃ average temperature), the regression model can be simplified and expressed as:
α＝aqbe-cT；
wherein α represents the water-cooling heat transfer coefficient, and the temperature is W/(m)2DEG C.); a. b and c represent model regression coefficients; q represents the water flow density in units of: l (m)2Min); t represents the surface temperature of the target steel sheet.
In one example, the heat transfer coefficients under different temperature and water flow density conditions can be determined approximately from regression curves made from empirical and measured data. The regression equation is as follows:
α＝1.087×105×q0.43068e-0.00935T。
in one example, a computational model of the temperature field may be as follows:
the steel plate can be regarded as an infinite flat plate, only the change of the temperature in the thickness direction can be considered, the change in the width direction and the length direction can be ignored, and an internal heat source is avoided, so that the one-dimensional unsteady heat conduction differential equation can be simplified:
wherein,
namely the thermal conductivity coefficient; d represents the thickness of the target steel plate.
And step 203, determining the current cooling parameters according to the final cooling temperature of the first stage.
In one embodiment, step 203 may comprise: and if the final cooling temperature of the first stage is less than the target return red temperature, adjusting the set cooling parameter to obtain the current cooling parameter.
Alternatively, the number of sets of cooling water in the setting parameter may be reduced, for example, one set of cooling water may be reduced.
For thick steel plates, the higher the cooling speed, the higher the heat exchange efficiency, the greater the temperature difference inside the steel plate, the surface cooling effect in the cooling process can not be quickly transferred to the core part, the greater the temperature difference on the core surface, the greater temperature gradient is formed, the stronger the heat conduction effect is, so in the air cooling process after cooling, the energy of the steel plate core part can be quickly transferred to the surface, but because the surface heat exchange efficiency of the steel plate in the air cooling process is very low, the energy transferred to the surface can not be taken away in time, the accumulation can be generated to increase the surface temperature, the phenomenon that the temperature drop rate of the core part temperature of the thick plate is smaller in the water cooling stage and the surface temperature thereof is greatly reddened in the air cooling stage can be formed, the cooling rule calculated by the cooling model is relatively discrete, especially when the opening mode of the quick cooling section header and the water quantity of the header is changed greatly, the large difference can be generated after the steel plate of the pyrometer, therefore, the difference of the calculation results of the self-learning models is large, and the frequent fluctuation of the red-returning temperature of different steel plates is finally caused, so that the fluctuation of the performance of the final product is large. Therefore, based on the requirement of the steel plate, the set cooling parameters are fixedly used to realize rapid cooling, then the cooling parameters are adaptively adjusted to enter slow cooling, and therefore the fluctuation of the product performance is small.
In another embodiment, step 203 may comprise: and if the first-stage final cooling temperature is greater than the target re-reddening temperature, determining the current cooling parameters according to the first-stage final cooling temperature and the target re-reddening temperature.
In this example, after the PDI data of the target steel sheet is acquired, the cooling control mode is determined based on the process parameters such as the chemical composition of the steel sheet, the target temperature of red-back, the target cooling rate, and the like, and the physical parameters such as the specific heat, the thermal conductivity, and the density in the PDI data.
And calculating the cooling process of each steel plate through a physical parameter model, a temperature analysis model and boundary conditions thereof involved in the cooling process, and setting the number of the opened cooling headers, the water flow of each cooling header and the running speed of the steel plate so as to calculate cooling curves under various water flow conditions, calculate actual cooling rates through the cooling curves and perform combined control on the steel plates of different cooling processes.
Alternatively, as shown in fig. 3, determining the current cooling parameter according to the first-stage final cooling temperature and the target re-reddening temperature may include the following steps.
And 2033, determining the required water flow according to the target cooling rate and the plurality of types of cooling rates.
The current cooling parameters comprise at least one of the opening number of the cooling headers, the water flow rate of each cooling header, the speed of a roller way, the acceleration of the roller way and the opening mode of the headers.
In this embodiment, the steps 2031 to 2034 can be implemented by using a cooling model.
And 204, performing second-stage cooling operation on the target steel plate according to the current cooling parameters.
And the cooling of the second stage is to control the phase change process of the steel, and a cooling control process is formulated according to different structures and process performance requirements required by the steel plate, so that the steel is rapidly cooled to obtain the required metallographic structure and mechanical properties.
And when the final cooling temperature is higher than the target re-reddening temperature in the first stage, the target steel plate can be continuously cooled in the second stage, and the phase transformation process and the structure state after phase transformation of the target steel plate are controlled in the second stage. And during the second-stage cooling, according to the cooling speed and the target re-reddening temperature required by the process, calculating the cooling parameters by using a mathematical model, so that the final cooling temperature of the target steel plate reaches the range set by the process, and finally the steel plate can be transformed into uniform and fine ferrite, pearlite or bainite tissues. Because the set cooling parameters in the first stage are fixed, the difference of the final cooling temperature of the steel plate in the first stage after the steel plate is cooled in the first stage is small, the difference of the cooling speed of the cooling parameters calculated by the model when the steel plate enters the second stage for cooling is also small, the difference of the mechanical properties of the steel plate can be reduced finally, the stability of the plate shape after cooling can be improved, and the effects of improving the production stability and the performance stability of the steel plate are realized.
In this embodiment, the cooling parameters may also be adjusted in real time during the second stage cooling process. Illustratively, the basis for the adjustment of the cooling parameter may be real-time status data of the steel sheet during the cooling process.
Alternatively, the moving speed curve of the target steel plate can be corrected according to the measured actual temperature, the target steel plate running speed and the water flow distribution condition of the target steel plate. So that the time when the target steel sheet enters cooling can be determined.
After the steel plate is rolled, information such as the measured thickness of the target steel plate, the temperature of the steel plate, equipment state parameters and the like can be obtained.
Optionally, the preset cooling parameter result obtained by calculation may be corrected according to the deviation between the final cooling temperature of the first stage and the target temperature of the red return.
In this embodiment, the current temperature of the target steel plate may be determined according to a temperature calculation method for calculating the final cooling temperature of the first stage, and the required operation speed of the target steel plate may be calculated based on the current temperature. And (3) approximating each section of the steel plate to the optimal cooling time by using the minimum area approximation calculation according to the speed curve of the target steel plate, and approximating the current temperature of the target steel plate obtained by combining calculation to the steel plate speed. The speed calculation takes into account the constraints of the roller table control system in the rolling and straightening zones.
In this embodiment, the cooling data of the second stage may also be collected for updating the cooling model. The method for controlling cooling after rolling of the medium plate in the embodiment further comprises the following steps: in the second-stage cooling operation process, acquiring real-time cooling parameters, speed change data of a roller way and state parameters of the target steel plate according to a preset time period; and calculating the cooling rate of the target steel plate in the second stage cooling operation process according to the real-time cooling parameters, the speed change data of the roller way and the state parameters of the target steel plate.
Alternatively, the preset period may be the current state data of the target steel plate collected once every minute.
And the cooling of the steel plate is completed after the cooling processes in the first stage and the second stage, the conditions of temperature change, roller speed change, header flow change and the like of the target steel plate in the cooling processes in the first stage and the second stage can be recorded, and the cooling rate is calculated according to the data, so that the self-learning model can correct parameters in a subsequent cooling model of the steel plate.
In this embodiment, the parameter in the cooling model may include a related correction coefficient, and the calculation of the data in the cooling process may result in a comparison between the calculated value and the actual value, and calculate a correction coefficient to correct the parameter of the cooling model.
For example, the self-learning of the correction parameters of the cooling model may be short-term self-learning or long-term self-learning. The short-term self-learning is used for parameter correction from rolled pieces to rolled pieces in the same batch, and the learned parameter values automatically replace the original parameter values and are used for the next same rolled piece. The long-term self-learning is used for long-term parameter correction of the same rolled piece of different batches, and the learned parameter values can selectively replace the existing parameter values in the cooling model.
Through the evaluation and research of the influence parameters of the subsequent cooling steel plate, the production evaluation standard is processed by combining the production statistical data, and the production data analysis application and each self-adaption of maintenance are classified.
In this embodiment, if the cooling of a steel sheet has been completed, a correction coefficient which is a function related to the deviation of the cooling finish cooling temperature of the series of steel grades of the steel sheet actually produced can be adaptively calculated. Then, the average value of the correction coefficients can be used for calculating the adaptive coefficient when the next steel plate in the same steel type series is cooled. Illustratively, the adaptive coefficients will be used in a pre-calculated model to adapt to the cooling conditions that adjust the steel grade series. Controlling a cooling model to carry out self-learning correction on the heat exchange coefficient and the cooling speed, wherein the correction method is represented as follows:
the calculation method for the cooling speed self-learning coefficient correction is represented as follows:
αcr＝CRmea/CRcal；
wherein, αcrExpressed as a cooling rate self-learning coefficient; CRmeaRepresents the actual average value of the cooling rate in units of: DEG C/s; CRcalRepresents the calculated average of the cooling rates in units of: DEG C/s.
The heat exchange coefficient self-learning coefficient correction calculation method comprises the following steps:
αhr＝ΔTmea/ΔTcal；
wherein, αhrExpressed as the heat transfer coefficient self-learning coefficient; delta TmeaExpressed as the difference between the actually measured average value of the start cooling temperature and the actually measured average value of the end cooling temperature; the unit is: DEG C; delta TcalRepresents the difference between the calculated mean value of the start-up cooling temperature and the calculated mean value of the end-cooling temperature, and has the unit: DEG C.
Through the self-learning mode, the corrected heat exchange coefficients are stored in the corresponding layers, so that the subsequent index calling is facilitated.
The embodiment of the application provides a novel full-automatic cooling regulation calculation method of a controlled cooling system, which combines the fixed cooling regulation of a medium plate controlled cooling system and the calculation of a cooling model, realizes highly intelligent automatic cooling control, can set a cooling mode according to the individual requirements of medium plate variety production, realizes the relative fixation of the cooling speed of a steel plate in different stages in the cooling process, and meets the requirements of alloy reduction steel production of medium plate enterprises and ensures the stability and uniformity of the final performance of products through the improvement of automatic functions, thereby saving the production cost.
The embodiment of the application can change the relatively random procedure output mode calculated by a single mathematical model, make up the adverse factors of the model with high modeling complexity and poor stability, and improve the calculation mode of the cooling procedure: fixing the cooling speed of the steel plate at the front stage of the cooling process (fixing the roller way speed, the header flow, the header opening mode and the like at the first stage), calculating the final cooling temperature at the first stage by a mathematical model according to a cooling schedule formed by the set cooling parameters at the first stage, the initial temperature of the steel plate, the water temperature and the PDI information of the steel plate, calculating the roller way speed, the header flow, the header opening mode and the like required at the second stage by the cooling model according to the required target re-reddening temperature and the final cooling temperature at the first stage as the opening temperature at the second stage, and the final cooling temperature hit after the cooling regulation is implemented is logically judged according to the change of working conditions and different requirements of the final cooling temperature, the cooling process is automatically controlled by adopting a closed-loop mode, therefore, the requirements of improving the performance stability of the steel plate and product development are met, the control precision and the flexibility and the changeability of functions are improved, and the flexible production technology is realized.
Example two
Based on the same application concept, the embodiment of the present application further provides a device for controlling cooling after rolling of a medium plate, which corresponds to the method for controlling cooling after rolling of a medium plate, and as the principle of solving the problem of the device in the embodiment of the present application is similar to that of the method for controlling cooling after rolling of a medium plate in the embodiment of the present application, the implementation of the device in the embodiment of the present application can refer to the description in the embodiment of the method, and repeated parts are not repeated.
Please refer to fig. 4, which is a schematic diagram of a functional module of a device for controlling cooling after rolling of a medium plate according to an embodiment of the present application. The modules in the after-rolling control cooling device for the medium plate in the embodiment are used for executing the steps in the above method embodiment. The controlled cooling device after the medium plate is rolled comprises: a first cooling module 301, a first calculating module 302, a first determining module 303, and a second cooling module 304; wherein,
the first cooling module 301 is used for performing a first-stage cooling operation on the target steel plate according to the set cooling parameters;
a first calculating module 302, configured to calculate a first-stage final cooling temperature of the target steel plate according to the set cooling parameter and a steel plate parameter of the target steel plate;
a first determining module 303, configured to determine a current cooling parameter according to the first-stage final cooling temperature;
and the second cooling module 304 is used for performing second-stage cooling operation on the target steel plate according to the current cooling parameters.
In a possible implementation, the first determining module 303 is configured to:
and if the final cooling temperature of the first stage is less than the target return red temperature, adjusting the set cooling parameter to obtain the current cooling parameter.
In a possible implementation, the first determining module 303 is configured to:
and if the first-stage final cooling temperature is greater than the target re-reddening temperature, determining the current cooling parameters according to the first-stage final cooling temperature and the target re-reddening temperature.
In a possible implementation, the first determining module 303 includes: a rate determining unit, a target determining unit, a density determining unit, and a parameter determining unit;
the speed determining unit is used for determining corresponding cooling speeds according to the steel plate parameters of the target steel plate and various cooling water flows if the final cooling temperature of the first stage is greater than the target re-reddening temperature;
the target determining unit is used for determining a target cooling rate according to the target red returning temperature;
the density determining unit is used for determining the required water flow according to the target cooling rate and the multiple types of cooling rates;
and the parameter determining unit is used for determining the current cooling parameters according to the required water flow, and the current cooling parameters comprise at least one of the opening number of the cooling headers, the water flow of each cooling header, the roller speed and the roller acceleration.
In a possible implementation manner, the device for controlling cooling after rolling of a medium plate in this embodiment further includes:
the acquisition module is used for acquiring real-time cooling parameters, speed change data of a roller way and state parameters of the target steel plate according to a preset time period in the second-stage cooling operation process;
and the second calculation module is used for calculating the cooling rate of the target steel plate in the second stage cooling operation process according to the real-time cooling parameters, the speed change data of the roller way and the state parameters of the target steel plate.
In a possible implementation, the first calculating module 302 is configured to:
calculating physical property parameters of the target steel plate according to the steel plate parameters of the target steel plate;
calculating the temperature field of the target steel plate according to the physical property parameters and the set cooling parameters;
and determining the first-stage final cooling temperature of the target steel plate according to the temperature field.
In a possible implementation manner, the device for controlling cooling after rolling of a medium plate provided in this embodiment may further include:
and the second determining module is used for determining the set cooling parameters corresponding to the target steel plate according to the model of the target steel plate.
In addition, the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program performs the steps of the method for controlling cooling after rolling the medium plate in the above method embodiments.
The computer program product for controlling the cooling method after rolling the medium plate provided in the embodiment of the present application includes a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the steps of the method after rolling the medium plate described in the above method embodiment, which may be specifically referred to in the above method embodiment and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for controlling cooling of a medium plate after rolling is characterized by comprising the following steps:
carrying out first-stage cooling operation on the target steel plate according to the set cooling parameters;
calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate;
determining current cooling parameters according to the first-stage final cooling temperature;
and carrying out second-stage cooling operation on the target steel plate according to the current cooling parameters.
2. The method of claim 1, wherein said step of determining current cooling parameters based on said first stage final cooling temperature comprises:
and if the first-stage final cooling temperature is greater than the target re-reddening temperature, determining the current cooling parameters according to the first-stage final cooling temperature and the target re-reddening temperature.
3. The method of claim 2, wherein the step of determining the current cooling parameter based on the first-stage final cooling temperature and the target re-reddening temperature if the first-stage final cooling temperature is greater than the target re-reddening temperature comprises:
if the final cooling temperature of the first stage is higher than the target re-reddening temperature, determining corresponding multi-class cooling rates according to the steel plate parameters of the target steel plate and various cooling water flows;
determining a target cooling rate according to the target temperature of the red return;
determining the required water flow according to the target cooling rate and the multiple types of cooling rates;
and determining the current cooling parameters according to the required water flow, wherein the current cooling parameters comprise at least one of the opening number of the cooling headers, the water flow of each cooling header, the speed of the roller way and the acceleration of the roller way.
4. The method of claim 3, further comprising:
in the second-stage cooling operation process, acquiring real-time cooling parameters, speed change data of a roller way and state parameters of the target steel plate according to a preset time period;
and calculating the cooling rate of the target steel plate in the second stage cooling operation process according to the real-time cooling parameters, the speed change data of the roller way and the state parameters of the target steel plate.
5. The method of claim 1, wherein said step of determining current cooling parameters based on said first stage final cooling temperature comprises:
and if the final cooling temperature of the first stage is less than the target return red temperature, adjusting the set cooling parameter to obtain the current cooling parameter.
6. The method of claim 1, wherein the step of calculating the first-stage final cooling temperature of the target steel sheet based on the set cooling parameter and the steel sheet parameter of the target steel sheet comprises:
calculating physical property parameters of the target steel plate according to the steel plate parameters of the target steel plate;
calculating the temperature field of the target steel plate according to the physical property parameters and the set cooling parameters;
and determining the first-stage final cooling temperature of the target steel plate according to the temperature field.
7. The method as claimed in any one of claims 1 to 6, wherein before the step of performing the first-stage cooling operation on the target steel sheet according to the set cooling parameters, the method further comprises:
and determining the set cooling parameters corresponding to the target steel plate according to the model of the target steel plate.
8. The utility model provides a cut deal post-rolling control cooling device which characterized in that includes:
the first cooling module is used for carrying out first-stage cooling operation on the target steel plate according to the set cooling parameters;
the first calculation module is used for calculating the first-stage final cooling temperature of the target steel plate according to the set cooling parameters and the steel plate parameters of the target steel plate;
the first determining module is used for determining the current cooling parameters according to the first-stage final cooling temperature;
and the second cooling module is used for carrying out second-stage cooling operation on the target steel plate according to the current cooling parameters.
9. An electronic device, comprising: a processor, a memory storing machine-readable instructions executable by the processor, the machine-readable instructions when executed by the processor performing the steps of the method of any of claims 1 to 7 when the electronic device is run.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, is adapted to carry out the steps of the method according to any one of claims 1 to 7.
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| CN115218603A (en) * | 2022-07-15 | 2022-10-21 | 北京京诚瑞达电气工程技术有限公司 | Cooling flow control method and device |
| CN115218603B (en) * | 2022-07-15 | 2023-11-24 | 北京京诚瑞达电气工程技术有限公司 | Cooling flow control method and device |
| CN115318844A (en) * | 2022-08-25 | 2022-11-11 | 湖南华菱湘潭钢铁有限公司 | Cooling process for producing medium steel plate |
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