Method and device for generating a rolling stock cross-section temperature field for a whole process of a rod wire production line

Abstract

The application provides a rolling piece cross-section temperature field generation method and device for a rod wire production line whole process, and the method comprises the following steps: constructing a cross-section unit node grid according to rolling piece cross-section geometric initial shape information; based on a finite element formula, processing rolling piece heat conduction equations and roller heat conduction equations according to the cross-section unit node grid, generating rolling piece cross-section grid unit heat balance equations and roller grid unit heat balance equations, and coupling and connecting to generate a rolling piece-roller finite element coupling heat transfer model in a rod wire rolling process; generating plastic deformation heat generation and friction heat generation according to the cross-section unit node grid and process parameters of the rolling piece geometric shape before and after different rolling passes, and solving a temperature equation of the finite element coupling heat transfer model to generate a rolling piece cross-section temperature field, so that accurate calculation of cross-section temperature changes in the whole process production procedure of the rod wire is realized, the prediction accuracy of the rod wire production process temperature is improved, and the calculation efficiency and applicability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the rolling technical field, and in particular to a rolling piece cross-section temperature field generation method and device for a bar and wire production line full process. BACKGROUND

[0002] Bar and wire are widely used in manufacturing, transportation, construction and other fields. In recent years, the steel industry advocates sustainable production, and more and more enterprises have higher requirements for the production cost, product quality and mechanical properties of bar and wire. Accurate prediction and control of temperature are crucial for bar and wire rolling process, cooling system, size accuracy and microstructure performance, and are an important way to improve production efficiency, reduce energy consumption and realize green production. Therefore, the research on bar and wire temperature prediction and analysis system has great significance for optimizing the factory design of bar and wire production line and improving product quality and resource utilization. In related technologies, the application of finite element method to study the temperature field of bar and wire only stays in a certain specific rolling process, and does not make complete prediction and analysis on the cross-section temperature of the full process, which cannot meet the actual production needs, resulting in inaccurate generated temperature field, low calculation efficiency and poor applicability. SUMMARY

[0003] One object of the present application is to provide a rolling piece cross-section temperature field generation method for a bar and wire production line full process, which realizes accurate calculation of cross-section temperature changes in the full process of bar and wire production, improves the prediction accuracy of bar and wire production process temperature, and improves the calculation efficiency and applicability. Another object of the present application is to provide a rolling piece cross-section temperature field generation device for a bar and wire production line full process. Still another object of the present application is to provide a computer readable medium. Still another object of the present application is to provide a computer device.

[0004] To achieve the above objects, one aspect of the present application discloses a rolling piece cross-section temperature field generation method for a bar and wire production line full process, comprising:

[0005] Obtaining process parameters and rolling piece cross-section geometric initial shape information of a current process in a bar and wire production line full process;

[0006] According to the rolling piece cross-section geometric initial shape information, a cross-section unit node grid is constructed;

[0007] Based on the finite element formula, the rolling piece thermal conduction equation and the roll thermal conduction equation constructed in advance are processed according to the cross-section unit node grid, to generate a rolling piece cross-section grid unit heat balance equation and a roll grid unit heat balance equation;

[0008] The rolling piece cross-section grid unit heat balance equation and the roller grid unit heat balance equation are coupled and connected to generate a finite element coupling heat transfer model of the rolling piece-roller in the rod and wire rolling process;

[0009] According to the cross-section unit node grid of the rolling piece before and after the geometric shape of different rolling passes and the process parameters, the plastic deformation heat and the friction heat are generated;

[0010] According to the process parameters, the plastic deformation heat and the friction heat, the temperature equation of the finite element coupling heat transfer model is solved to generate the rolling piece cross-section temperature field.

[0011] Preferably, the rolling piece cross-section geometric initial shape information includes shape type and shape size, and the shape type is rectangular;

[0012] According to the rolling piece cross-section geometric initial shape information, the cross-section unit node grid is constructed, including:

[0013] According to the shape size, the initial rectangular cross-section of the corresponding shape size is selected to construct the rectangular cross-section unit node grid.

[0014] Preferably, the shape type is non-rectangular;

[0015] According to the rolling piece cross-section geometric initial shape information, the cross-section unit node grid is constructed, including:

[0016] According to the shape size, the initial rectangular cross-section of the corresponding shape size is selected to construct the rectangular cross-section unit node grid.

[0017] According to the shape size of the rolling piece initial rectangular grid node and the shape size of the rolling piece cross-section geometric initial shape information of different rolling passes, the non-rectangular cross-section unit node grid is generated through geometric transformation.

[0018] Preferably, the process parameters include rolling process parameters, cooling process parameters, material thermal physical property data and thermodynamic constants;

[0019] Before the rolling piece cross-section grid unit heat balance equation and the roller grid unit heat balance equation are generated by processing the rolling piece heat conduction equation and the roller heat conduction equation which are constructed in advance based on the finite element formula according to the cross-section unit node grid, it further includes:

[0020] According to the material thermal physical property data, the rolling piece heat conduction control equation is constructed;

[0021] According to the rolling process parameters, the cooling process parameters and the thermodynamic constants, the rolling piece heat conduction boundary condition is constructed;

[0022] According to the rolling piece heat conduction control equation and the rolling piece heat conduction boundary condition, the rolling piece heat conduction equation is generated.

[0023] Preferably, the process parameters include rolling process parameters;

[0024] Before the rolling piece cross section grid unit heat balance equation and the rolling roller grid unit heat balance equation are generated based on the finite element formula and according to the cross section unit node grid, the following steps are further included:

[0025] According to the rolling process parameters, the rolling roller heat conduction control equation and the rolling roller heat conduction boundary condition are constructed.

[0026] According to the preset rolling roller heat conduction initial condition, the rolling roller heat conduction control equation and the rolling roller heat conduction boundary condition, the rolling roller heat conduction equation is generated.

[0027] Preferably, the plastic deformation heat generation and the friction heat generation are generated according to the cross section unit node grid of the rolling piece before and after the geometry shape of different rolling passes and the process parameters, and the steps include:

[0028] According to the cross section unit node grid of the rolling piece before and after the geometry shape of different rolling passes, the grid unit area of the cross section unit node grid in the rolling process, the strain rate of each node of the cross section and the grid unit boundary are generated.

[0029] According to the process parameters, the grid unit area of the cross section unit node grid and the strain rate of each node of the cross section, the plastic deformation heat generation is generated.

[0030] According to the grid unit boundary and the process parameters, the friction heat generation is generated.

[0031] Preferably, the temperature equation of the finite element coupled heat transfer model is solved according to the process parameters, the plastic deformation heat generation and the friction heat generation, and the rolling piece cross section temperature field is generated, and the steps include:

[0032] The time term of the temperature equation of the finite element coupled heat transfer model is processed by the Euler backward difference method, and the simplified system finite element equation is generated.

[0033] According to the plastic deformation heat generation, the friction heat generation and the process parameters, the temperature equation of the system finite element equation is solved, and the rolling piece cross section temperature field is generated.

[0034] Preferably, after the temperature equation of the finite element coupled heat transfer model is solved according to the process parameters and the cross section unit node grid, and the rolling piece cross section temperature field is generated, the following steps are further included:

[0035] According to the rolling piece cross section temperature field, a two-dimensional cloud picture of the rolling piece cross section temperature is drawn.

[0036] The application also discloses a rolling piece cross section temperature field generation device for a whole process of a rod wire production line, which comprises:

[0037] The acquisition unit is configured to acquire process parameters of a current process and initial shape information of a cross section of a rolled piece in a whole-process technology of a bar and wire rod production line.

[0038] The grid construction unit is configured to construct a cross section unit node grid according to the initial shape information of the cross section of the rolled piece.

[0039] The heat balance equation generation unit is configured to process a pre-constructed heat conduction equation of the rolled piece and a heat conduction equation of a roll according to the cross section unit node grid based on a finite element formula, and generate a heat balance equation of a cross section grid unit of the rolled piece and a heat balance equation of a grid unit of the roll.

[0040] The coupling unit is configured to couple and connect the heat balance equation of the cross section grid unit of the rolled piece and the heat balance equation of the grid unit of the roll, and generate a finite element coupled heat transfer model of the rolled piece and the roll in a bar and wire rod rolling process.

[0041] The heat generation unit is configured to generate plastic deformation heat and friction heat according to the cross section unit node grid of the geometric shape of the rolled piece before and after different rolling passes and the process parameters.

[0042] The temperature field generation unit is configured to solve a temperature equation of the finite element coupled heat transfer model according to the process parameters, the plastic deformation heat and the friction heat, and generate a cross section temperature field of the rolled piece.

[0043] Preferably, the initial shape information of the cross section of the rolled piece includes a shape type and a shape size, and the shape type is a rectangle.

[0044] The grid construction unit is specifically configured to select an initial rectangular cross section with a corresponding shape size according to the shape size of the rectangle, and construct a cross section unit node grid of the rectangle.

[0045] Preferably, the shape type is a non-rectangle.

[0046] The grid construction unit is specifically configured to perform scaling processing on the initial cross section of the rolled piece according to the shape size according to a specified cross section ratio and a scaling ratio, and construct an initial rectangular grid of the rolled piece; and perform geometric transformation on the initial rectangular grid of the rolled piece and the shape size of the initial shape information of the cross section of the rolled piece according to different rolling passes, to generate a cross section unit node grid of a non-rectangle.

[0047] Preferably, the process parameters include rolling process parameters, cooling process parameters, material thermal physical property data and thermodynamic constants.

[0048] The device further includes:

[0049] The rolled piece control equation construction unit is configured to construct a heat conduction control equation of the rolled piece according to the material thermal physical property data.

[0050] The rolling piece boundary condition construction unit is configured to construct a rolling piece heat conduction boundary condition according to rolling process parameters, cooling process parameters and thermodynamic constants.

[0051] The rolling piece heat conduction equation construction unit is configured to generate a rolling piece heat conduction equation according to the rolling piece heat conduction control equation and the rolling piece heat conduction boundary condition.

[0052] Preferably, the process parameters include rolling process parameters.

[0053] The device further comprises:

[0054] The roll control boundary condition construction unit is configured to construct a roll heat conduction control equation and a roll heat conduction boundary condition according to rolling process parameters.

[0055] The roll heat conduction equation construction unit is configured to generate a roll heat conduction equation according to a preset roll heat conduction initial condition, the roll heat conduction control equation and the roll heat conduction boundary condition.

[0056] Preferably, the heat generation unit is specifically configured to generate a grid element area of a rolling process cross section element node grid, a strain rate of each node of the cross section and a grid element boundary according to the cross section element node grid of the rolling piece before and after different rolling passes; generate plastic deformation heat according to the process parameters, the grid element area of the cross section element node grid and the strain rate of each node of the cross section; and generate friction heat according to the grid element boundary and the process parameters.

[0057] Preferably, the temperature field generation unit is specifically configured to process a time term of a temperature equation of a finite element coupled heat transfer model by Euler backward difference method to generate a simplified system finite element equation; and solve the temperature equation of the system finite element equation according to the plastic deformation heat, the friction heat and the process parameters to generate a rolling piece cross section temperature field.

[0058] Preferably, the device further comprises:

[0059] The drawing unit is configured to draw a two-dimensional cloud chart of the rolling piece cross section temperature according to the rolling piece cross section temperature field.

[0060] The application further discloses a computer readable medium, which stores a computer program, and the program is executed by a processor to realize the method.

[0061] The application further discloses a computer device, which comprises a memory and a processor, the memory is used to store information comprising program instructions, the processor is used to control execution of the program instructions, and the processor realizes the method when executing the program.

[0062] The application also discloses a computer program product comprising computer programs / instructions which, when executed by a processor, implement the method described above.

[0063] The application obtains the process parameters of the current process and the initial shape information of the cross section of the rolled piece in the whole process of the rod wire production line; the initial shape information of the cross section of the rolled piece is used to construct a cross section unit node grid; based on the finite element formula, the heat conduction equation of the rolled piece and the heat conduction equation of the roll are processed according to the cross section unit node grid to generate a heat balance equation of the cross section grid unit of the rolled piece and a heat balance equation of the roll grid unit; the heat balance equation of the cross section grid unit of the rolled piece and the heat balance equation of the roll grid unit are coupled and connected to generate a finite element coupled heat transfer model of the rolled piece-roll in the rod wire rolling process; the plastic deformation heat and the friction heat are generated according to the cross section unit node grid and the process parameters of the geometry shape of the rolled piece before and after the rolling of different rolling passes; the temperature equation of the finite element coupled heat transfer model is solved according to the process parameters, the plastic deformation heat and the friction heat to generate the cross section temperature field of the rolled piece, so that the accurate calculation of the cross section temperature change of the whole process production process of the rod wire is realized, the prediction accuracy of the temperature of the rod wire production process is improved, and the calculation efficiency and applicability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0065] Figure 1 A flow chart of a rolled piece cross section temperature field generation method of a whole process of a rod wire production line provided by the embodiment of the present application;

[0066] Figure 2 A flow chart of another rolled piece cross section temperature field generation method of a whole process of a rod wire production line provided by the embodiment of the present application;

[0067] Figure 3 A schematic diagram of the rolling gap shape of a rough rolling mill provided by the embodiment of the present application;

[0068] Figure 4 A schematic diagram of the rectangular cross section grid distribution provided by the embodiment of the present application;

[0069] Figure 5 A node distribution schematic diagram of the geometric transformation of the cross section grid shape of the rolled piece provided by the embodiment of the present application;

[0070] Figure 6A schematic diagram of a circular cross-section unit node grid provided for an embodiment of the present application;

[0071] Figure 7 A schematic diagram of an elliptical cross-section unit node grid provided for an embodiment of the present application;

[0072] Figure 8 A schematic diagram of an elliptical rolling process grid transformation process provided for an embodiment of the present application;

[0073] Figure 9 A schematic diagram of a bar and wire rolling piece and roller coupled heat transfer model provided for an embodiment of the present application;

[0074] Figure 10 A schematic diagram of a bar and wire rolling piece and roller coupled heat transfer model provided for an embodiment of the present application;

[0075] Figure 11 A schematic diagram of a bar and wire rolling piece and roller coupled heat transfer model provided for an embodiment of the present application;

[0076] Figure 12 A schematic diagram of a computer device provided for an embodiment of the present application. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0078] It should be noted that the bar and wire production line full-process rolling piece cross-section temperature field generation method and device disclosed in the present application can be used in the field of artificial intelligence technology, and can also be used in any field other than the field of artificial intelligence technology. The application field of the bar and wire production line full-process rolling piece cross-section temperature field generation method and device disclosed in the present application is not limited.

[0079] In order to facilitate understanding of the technical solutions provided in the present application, the related content of the technical solutions of the present application will be described first. The production process of the bar and wire rod mainly includes phosphorus removal, rough rolling, medium rolling, finishing rolling, cooling, wire drawing, etc. The complex metal deformation and different heat exchange modes in each process result in uneven distribution of the cross-section temperature of the rolled piece. At present, the on-site measurement can only collect the surface temperature of the rolled piece, and the core temperature cannot be determined, so the accurate temperature information of the whole process cannot be obtained, and therefore the high-precision control of the microstructure and performance of the material cannot be realized. In order to realize the accurate prediction of the temperature and the high-precision control of the microstructure and performance of the bar and wire rod production process, it is necessary to develop a set of full-process temperature field prediction model for the bar and wire rod.

[0080] The intelligentization of the bar and wire rod production and the precision of the process control are the key to improve the product quality, and the accurate prediction and control of the temperature are crucial for the microstructure and mechanical properties of the product, and can effectively reduce the cost, improve the yield, realize energy saving and emission reduction, and green manufacturing. At present, the bar and wire rod production line has the hardware conditions of controlling rolling and cooling, but a reasonable rolling process procedure still needs to be formulated, and the cross-section temperature change of the rolled piece in the whole process needs to be accurately predicted. The present application takes the accurate control of the temperature of the rolled piece, the optimization of the rolling strategy and the improvement of the production efficiency as the research target, and based on the finite element method and the heat transfer principle, according to the actual production process and process parameters of the bar and wire rod production line, a high-precision full-process temperature field prediction model of the coupling of the bar and wire rod rolled piece and the roller is established, and the cross-section temperature change of the bar and wire rod full-process production process is accurately calculated. The successful application of the present application can improve the prediction accuracy of the temperature of the bar and wire rod production process, improve the regulation and control ability of the microstructure and performance of the product, provide technical support for optimizing the rolling process procedure, provide a theoretical basis for the accurate control of the production process, reduce the production cost, improve the product quality and improve the production efficiency.

[0081] The following takes the rolled piece cross-section temperature field generation device of the bar and wire rod production line full-process as an example to illustrate the implementation process of the rolled piece cross-section temperature field generation method of the bar and wire rod production line full-process provided in the embodiments of the present application. It can be understood that the execution subject of the rolled piece cross-section temperature field generation method of the bar and wire rod production line full-process provided in the embodiments of the present application includes but is not limited to the rolled piece cross-section temperature field generation device of the bar and wire rod production line full-process.

[0082] Figure 1 The flow chart of the rolled piece cross-section temperature field generation method of the bar and wire rod production line full-process provided in the embodiments of the present application is shown in Figure 1 The method comprises the following steps.

[0083] Step 101, obtaining the process parameters of the current process in the full-process of the bar and wire rod production line and the initial shape information of the cross-section of the rolled piece.

[0084] In the embodiment of the present application, at least one process in the whole process of bar and wire rod production is selected, including heating furnace temperature rising, rough rolling, intermediate rolling, finishing rolling, interpass air cooling and water cooling. According to the selected specific process, the process parameters related to the process are input. The geometric section shape and size of the rolled piece before and after rolling are input, and for the complex geometric section, the function equation can be input for description.

[0085] Step 102, according to the initial shape information of the rolled piece section geometry, a section unit node grid is constructed.

[0086] In the embodiment of the present application, the section unit node grid is established. If the initial blank is rectangular, the initial rectangular section of the same size can be directly selected to establish the finite element grid, and if the initial blank is not rectangular, the rectangular section initial grid is first established, and then the node grid of the complex section shape is obtained through geometric transformation.

[0087] Step 103, based on the finite element formula, according to the section unit node grid, the pre-constructed rolled piece heat conduction equation and the roll heat conduction equation are processed to generate the rolled piece section grid unit heat balance equation and the roll grid unit heat balance equation.

[0088] In the embodiment of the present application, according to the roll gap shape and boundary conditions of the roll in the rolling process, the heat conduction differential equations of the rolled piece and the roll are constructed.

[0089] Step 104, the rolled piece section grid unit heat balance equation and the roll grid unit heat balance equation are coupled and connected to generate the finite element coupled heat transfer model of the rolled piece-roll in the bar and wire rod rolling process.

[0090] In the embodiment of the present application, the heat transfer equation of the roll is constructed based on the finite element method and connected with the equation of the rolled piece to construct the finite element equation of the rolled piece-roll coupled heat transfer in the bar rolling process.

[0091] Step 105, according to the section unit node grid of the geometric shape of the rolled piece before and after rolling and the process parameters of different rolling passes, the plastic deformation heat and friction heat are generated.

[0092] Step 106, according to the process parameters, the plastic deformation heat and the friction heat, the temperature equation of the finite element coupled heat transfer model is solved to generate the rolled piece section temperature field.

[0093] In the embodiment of the present application, the temperature equation of the rolled piece and the roll node is solved to obtain the distribution of the rolled piece section temperature field.

[0094] In the technical scheme provided by the embodiment of the present application, the process parameters of a current process in a whole-process process of a bar and wire rod production line and initial shape information of a cross section of a rolled piece are acquired; a cross section unit node grid is constructed according to the initial shape information of the cross section of the rolled piece; based on a finite element formula, the heat conduction equation of the rolled piece and the heat conduction equation of a roll are processed according to the cross section unit node grid, to generate a heat balance equation of a cross section grid unit of the rolled piece and a heat balance equation of a roll grid unit; the heat balance equation of the cross section grid unit of the rolled piece and the heat balance equation of the roll grid unit are coupled and connected, to generate a finite element coupled heat transfer model of the rolled piece and the roll in a bar and wire rod rolling process; plastic deformation heat and friction heat are generated according to the cross section unit node grid of the geometric shape of the rolled piece before and after different rolling passes and the process parameters; the temperature equation of the finite element coupled heat transfer model is solved according to the process parameters, the plastic deformation heat and the friction heat, to generate a cross section temperature field of the rolled piece, so that accurate calculation of the cross section temperature change of the whole-process production process of the bar and wire rod is realized, the prediction accuracy of the temperature in the production process of the bar and wire rod is improved, and the calculation efficiency and applicability are improved.

[0095] Figure 2 A flow chart of another method for generating a cross section temperature field of a rolled piece in a whole-process of a bar and wire rod production line provided by the embodiment of the present application is shown in FIG. 1, and the method comprises the following steps. Figure 2

[0096] In step 201, process parameters of a current process in a whole-process process of a bar and wire rod production line and initial shape information of a cross section of a rolled piece are acquired.

[0097] In the embodiment of the present application, each step is executed by a rolled piece cross section temperature field generation device of a whole-process of a bar and wire rod production line.

[0098] In the embodiment of the present application, at least one process is selected and the process parameters required by the process are acquired according to the whole-process process of the bar and wire rod production line. The whole-process process includes heating furnace temperature rising, phosphorus removal, rough rolling, intermediate rolling, finish rolling, inter-pass air cooling and water cooling. Specifically, at least one process input or a bar and wire rod rolling program table is selected according to the process procedure of the bar and wire rod production line. According to the selected specific process, the process parameters related to the process are input. For example, the rolling process is selected, and the rolling process parameters including but not limited to the initial temperature of the rolled piece, the thermal conductivity of the rolled piece, the density of the rolled piece, the specific heat capacity of the rolled piece, the rolling speed, the friction coefficient, the heat transfer coefficient of the rolled piece and air, the air temperature, the emissivity, the roll temperature, the thermal conductivity of the roll, the density of the roll, the specific heat capacity of the roll, the heat transfer coefficient of the rolled piece and the roll, etc. are required to be input. Since there is metal plastic deformation heat in the rolling process, the deformation resistance curve of the specific steel grade also needs to be input.

[0099] In the embodiment of the present application, the process parameters include but are not limited to rolling process parameters, cooling process parameters, material thermal physical property data and thermodynamic constants. ​

[0100] Rolling process parameters are parameters required in the rolling process, including but not limited to rolling piece deformation resistance curve, rolling speed, rolling piece and roll friction coefficient, rolling piece and roll contact heat exchange coefficient, roll initial temperature, rolling time, roll thermal conductivity, roll density and roll specific heat capacity.

[0101] Cooling process parameters are parameters required in the dephosphorization, air cooling and water cooling processes, including but not limited to ambient temperature, cooling process heat exchange coefficient and cooling time.

[0102] Material thermal property data includes but is not limited to rolling piece temperature, rolling piece thermal conductivity, rolling piece density, rolling piece specific heat capacity and fitted material thermal property curve.

[0103] Thermodynamic constants include but are not limited to Boltzmann constant and emissivity.

[0104] In the embodiment of the present application, according to the roll gap shape of the roll in the rolling process, the cross-sectional geometric shape information of the rolling piece in each process is obtained. The initial cross-sectional geometric shape information of the rolling piece includes shape type and shape size. The shape type includes but is not limited to rectangle, circle and ellipse. If the shape type is rectangle, the shape size includes length and width; if the shape type is circle, the shape size includes circle diameter; if the shape type is ellipse, the shape size includes major axis radius and minor axis radius. Figure 3 A schematic diagram of the rolling pass roll gap shape of a rough rolling mill train provided in the embodiment of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, there are 6 rolling mills in the rough rolling mill train, i.e. 6 mill stands, the roll gap shape of the first two passes is rectangle, i.e. the shape type of the cross-sectional geometric shape of the rolling piece is rectangle, and the shape size is 175mm x 125mm; the roll gap shape of the third pass is ellipse, i.e. the shape type of the cross-sectional geometric shape of the rolling piece is ellipse, and the shape size includes major axis (2a) of 150mm and minor axis (2b) of 90mm; the roll gap shape of the fourth pass is circle, i.e. the shape type of the cross-sectional geometric shape of the rolling piece is circle, and the shape size includes diameter (d) of 105mm; the roll gap shape of the fifth pass is ellipse, i.e. the shape type of the cross-sectional geometric shape of the rolling piece is ellipse, and the shape size includes major axis (2a) of 126mm and minor axis (2b) of 62mm; the roll gap shape of the sixth pass is circle, i.e. the shape type of the cross-sectional geometric shape of the rolling piece is circle, and the shape size includes diameter (d) of 77mm. If the initial blank is a 175mm x 125mm rectangular blank, after passing through the rough rolling mill train, the cross-sectional shape is a 77mm diameter circular bar.

[0105] It is worth mentioning that for a complex geometric cross-section, a shape function equation can be inputted for description.

[0106] Step 202, constructing a cross-section unit node grid according to the initial shape information of the cross-section geometry of the rolled piece.

[0107] In the process of rod and wire rolling, the cross-section geometry of the rolled piece after each pass is different according to the shape of the roll gap. Taking a rectangle, a circle and an ellipse as examples, a method for constructing and transforming the unit grid in the rolling deformation process is proposed. It is worth noting that the cross-section shape of the rolled piece is not limited to these three types, and this method can also be used for more complex geometries.

[0108] If the shape type of the initial shape information of the cross-section geometry of the rolled piece is a rectangle, an initial rectangular cross-section with corresponding shape size is selected according to the shape size of the rectangle to construct a rectangular cross-section unit node grid. The geometry and heat exchange mode of the rod and wire cross-section are symmetrical in the width and thickness directions, so a quarter of the cross-section is taken for calculation, and the heat flux is zero in the vertical direction of the symmetry axis. Figure 4 A schematic diagram of the rectangular cross-section grid distribution provided for the embodiments of the present application is shown in Figure 4 A four-sided element grid is established with a rectangular cross-section as the starting shape. Since the temperature change at the edge of the cross-section is more significant than the center, the grid adopts a distribution form of dense outside and sparse inside.

[0109] Taking the roll gap shape of the first pass in Figure 3 as an example, the cross-section of the billet in the first pass is a rectangle of 175mm x 125mm, so the initial rectangular cross-section with the same size can be directly selected to establish the finite element grid.

[0110] It is worth noting that if the initial billet is not a rectangle, a rectangular cross-section initial grid needs to be established first, and then the node grid of the complex cross-section shape is obtained through geometric transformation. The grid form of the geometric cross-section can be obtained by geometric transformation from the rectangular cross-section, which will be described in detail below.

[0111] If the shape type of the initial shape information of the cross-section geometry of the rolled piece is non-rectangular, i.e., circular or elliptical, step 202 specifically includes:

[0112] Step 2021, according to the specified cross-section ratio and scaling ratio, scaling the initial cross-section of the rolled piece according to the shape size to construct an initial rectangular grid of the rolled piece.

[0113] As an optional solution, the cross-section ratio is 1 / 4 and the scaling ratio is 0.8. Specifically, 1 / 4 of the cross-section is taken, 8 units are selected in the length and width directions respectively, the scaling ratio is 0.8 (the length and width of the rectangular unit are 0.8 of the previous unit in the length and width directions along the cross-section), and the initial rectangular grid is established.

[0114] Step 2022, according to the node of the initial rectangular grid of the rolled piece and the shape size of the initial shape information of the rolled piece section geometry of different rolling passes, geometric transformation is carried out to generate a non-rectangular section unit node grid.

[0115] Specifically, the nodes of the rectangular edge are mapped to the post-rolling geometric shape edge through linear scaling. Figure 5 A node distribution diagram for geometric transformation of a rolled piece section grid shape is provided for the embodiment of the present application, as shown in Figure 5 For the nodes p1, p2, p3, p4 and p5 on the boundary of the initial rectangular network, the node p i (x i , y i ) on the rectangular boundary is connected with the center of symmetry, and the intersection point p' i of the connecting line with the post-rolling geometric boundary is the position of the point after geometric transformation, and the scaling ratio is β = op' i / op i , and the coordinate of the transformed point p' i (βx i ,βy i ) is: the points p1, p2, p3, p4 and p5 on the initial rectangular boundary are transformed into p'1, p'2, p'3, p'4 and p'5. For the node p6 inside the initial rectangular network, the connecting line of the node p6 and o is extended to the rectangular boundary, and intersects with the rectangular and post-rolling geometric boundary at points q6 and q'6, respectively, and according to the same scaling method, the coordinate of the transformed p'6 is

[0116] Figure 6 A schematic diagram of a circular section unit node grid is provided for the embodiment of the present application; Figure 7 A schematic diagram of an elliptical section unit node grid is provided for the embodiment of the present application.

[0117] Taking the roll gap shape of the third pass in Figure 3 as an example, the blank section of the third pass is an ellipse with a major axis (2a) of 150 mm and a minor axis (2b) of 90 mm. Figure 8 A schematic diagram of an elliptical rolling process grid transformation process is provided for the embodiment of the present application, as shown in Figure 8 The inlet section is the exit roll gap shape of the second pass, that is, a rectangle of 65 mm x 65 mm; after geometric transformation, the exit section shape is an elliptical section unit node grid with a semi-major axis (a) of 75 mm and a semi-minor axis (b) of 45 mm.

[0118] It is worth noting that the initial matrix mesh or initial non-matrix mesh represents the initial shape of the rolled piece. After different rolling passes, the cross-sectional shape will change, but the scaling method of the node mesh remains the same. This mesh transformation method is not only used to construct non-rectangular initial cross-sectional meshes, but also applied to mesh adaptive algorithms for cross-sectional shape changes during the rolling process.

[0119] Step 203: Construct the heat conduction equation for the rolled piece.

[0120] Figure 9 A coupled heat transfer model of bar and wire rod rolled products and rolls is provided for embodiments of the present invention, such as... Figure 9 As shown, the x-axis, y-axis, and z-axis define a three-dimensional coordinate system. Solid circles represent the outer diameter of the roll, dashed circles represent the inner diameter, single-arrow lines inside the roll indicate the roll radius, and single-arrow lines on the outer tangent of the roll indicate the direction of roll movement, i.e., counter-clockwise rotation. The workpiece moves from left to right relative to the roll during the rolling process; the dotted line is the axis of symmetry of the workpiece. Figure 9 The figure shown is symmetrical about the axis of symmetry, with the height of the workpiece before rolling being H. Figure 9 The value shown is H / 2; the height of the rolled piece after rolling is h. Figure 9 The value shown is h / 2.

[0121] In this embodiment of the invention, step 203 specifically includes:

[0122] Step 2031: Based on the material's thermal properties data, construct the heat conduction control equation for the rolled piece.

[0123] In this embodiment of the invention, the material thermal property data includes, but is not limited to, rolling temperature, rolling thermal conductivity, rolling density, and rolling specific heat capacity.

[0124] Heat transfer during rolling includes heat from plastic deformation of the metal, heat exchange between the workpiece and the rolls, frictional heat generation between the workpiece and the rolls, and convective heat transfer between the workpiece and the air. Heat transfer between passes and during the wire drawing process includes convective and radiative heat transfer between the workpiece and the air. During cooling, heat transfer manifests as convective heat transfer between the workpiece and water. Based on the production process characteristics of bar and wire rods, neglecting heat conduction in the rolling direction, the heat balance equation can be simplified to a two-dimensional heat conduction equation on the cross-section, namely: the heat conduction control equation for the workpiece:

[0125]

[0126] Among them, T b The temperature of the rolled piece is expressed in Kelvin (K); k b ρ is the thermal conductivity of the rolled workpiece, expressed in W / (m·K); b Density of rolled product, unit: kg / m³ 3 ;cb Cp is the specific heat capacity of the rolled piece, with the unit of J / (kg·K); Q is the heat energy generated by plastic deformation of the rolled piece, with the unit of W / m 3 .

[0127] The heat energy generated by plastic deformation of the rolled piece can be calculated by the plastic deformation work as follows:

[0128]

[0129] wherein, Q is the heat energy generated by plastic deformation of the rolled piece, with the unit of W / m 3 ; and σ is the deformation resistance of the rolled piece, with the unit of MPa, which can be obtained by the deformation resistance curve of the rolled piece; is the strain rate of each node of the section, which can be calculated by the node grid of the section element.

[0130] In step 2032, the heat conduction boundary condition of the rolled piece is constructed according to the rolling process parameters, the cooling process parameters and the thermodynamic constant.

[0131] In the embodiment of the present application, the rolling process parameters include the contact heat exchange coefficient of the rolled piece and the roller, the roller surface temperature, the friction stress, and the relative speed of the rolled piece and the roller. The cooling process parameters include but are not limited to the environmental temperature, the heat exchange coefficient in the cooling process, and the cooling time. The thermodynamic constant includes but is not limited to the Boltzmann constant and the emissivity.

[0132] In the embodiment of the present application, the boundary condition of the rolling deformation zone includes the contact area of the rolled piece and the roller, the heat exchange area of the rolled piece and the air, and the convective heat exchange of the rolled piece and the water.

[0133] The contact area of the rolled piece and the roller is composed of the contact heat exchange and the friction heat generation of the roller and the rolled piece, and the boundary condition is as follows:

[0134]

[0135] q fric = τ | Δv |

[0136] wherein, k is the thermal conductivity of the rolled piece; T b is the temperature of the rolled piece, with the unit of Kelvin (K); h con is the contact heat exchange coefficient of the rolled piece and the roller, with the unit of W / (m 2 ·K); T r is the roller surface temperature, with the unit of Kelvin (K); q fric is the friction heat generation; τ is the friction stress on the contact surface, with the unit of N / m 2 ; and Δv is the relative speed of the rolled piece and the roller, with the unit of m / s.

[0137] The heat exchange area of the rolled piece and the air is composed of convective heat exchange and radiative heat exchange, and the boundary condition is:

[0138]

[0139] wherein k is the thermal conductivity of the rolled piece; T b is the temperature of the rolled piece, in Kelvin (K); h a is the convective heat exchange coefficient of the rolled piece and the air, in W / (m 2 ·K); T a is the temperature of the air, in Kelvin (K); ω is the Boltzmann constant, in W / (m 2 ·K 4 ); and α is the emissivity.

[0140] The heat exchange mode of the dephosphorization and cooling process is the convective heat exchange of the rolled piece and the water, and the boundary condition is:

[0141]

[0142] wherein k is the thermal conductivity of the rolled piece; T b is the temperature of the rolled piece, in Kelvin (K); h w is the convective heat exchange coefficient of the rolled piece and the water, in W / (m 2 ·K); and T w is the temperature of the water, in Kelvin (K).

[0143] Step 2033, generating a rolled piece heat conduction equation according to the rolled piece heat conduction control equation and the rolled piece heat conduction boundary condition.

[0144] Specifically, the rolled piece heat conduction control equation, the boundary condition of the contact area of the rolled piece and the roll, the boundary condition of the heat exchange area of the rolled piece and the air, and the boundary condition of the convective heat exchange of the rolled piece and the water are combined to generate the rolled piece heat conduction equation.

[0145] Step 204, constructing a roll heat conduction equation.

[0146] Figure 10 A schematic diagram of a rod wire roll heat transfer mathematical model provided by the embodiment of the present application is shown in FIG. 1, wherein the x-axis and the r-axis define a roll heat transfer coordinate system, wherein r is the radius direction of the roll, and x is the axial direction of the roll. The solid line represents the outer contour of the roll, and the dotted circle represents the cross-sectional shape of the rolled piece. In the embodiment of the present application, step 204 specifically comprises: Figure 10

[0147] Step 2041, constructing a roll heat conduction control equation and a roll heat conduction boundary condition according to the rolling process parameters.

[0148] ​During rolling, the surface temperature of the work roll will change. In order to obtain the high-precision temperature field distribution of the rolled piece section, the heat conduction model of the roll and the rolled piece needs to be coupled. Ignoring the heat transfer of the roll in the circumferential direction, only the radial and axial directions are considered, and the heat conduction control equation of the rolled piece is expressed as:

[0149]

[0150] Wherein, r is the unit position vector, which can be obtained by interpolation method r = ΣN i r i ; k is the roll conduction coefficient, with the unit of W / (m·K); T is the roll temperature, with the unit of Kelvin (K); p is the roll density, with the unit of kg / m r ; c is the roll specific heat capacity, with the unit of J / (kg·K). r r 3 r

[0151] The heat conduction boundary condition of the roll in the contact heat exchange part is:

[0152] At t = 0, the initial temperature of the roll is T0T(r, x) = T0.

[0153] At t > 0,

[0154]

[0155] q fric = τ|Δv|

[0156]

[0157] Wherein, k is the roll conduction coefficient, with the unit of W / (m·K); T is the roll temperature, with the unit of Kelvin (K); T is the rolled piece temperature, with the unit of Kelvin (K); R is the roll radius, with the unit of m; q is the friction heat; τ is the friction stress on the contact surface, with the unit of N / m r ; Δv is the relative speed of the rolled piece and the roll, with the unit of m / s; r is the outer region radius, with the unit of mm. r b fric 2 *

[0158] It is worth noting that in the outer region, the roll temperature is uniformly distributed.

[0159] Step 2042, generating the roll heat conduction equation according to the preset roll heat conduction initial condition, roll heat conduction control equation and roll heat conduction boundary condition.

[0160] ​​​​​​​​​In the embodiment of the present application, the initial condition is set as that at t=0, the initial temperature of the roll is T0, and T(r,x)=T0.

[0161] Specifically, the roll heat conduction initial condition, the roll heat conduction control equation, the boundary condition of the heat exchange region of the rolled piece and air, the roll heat conduction boundary condition of the contact heat exchange part and the boundary condition of the convective heat exchange of the rolled piece and water are combined to generate the roll heat conduction equation.

[0162] In step 205, based on the finite element formula, the pre-constructed rolled piece heat conduction equation and the roll heat conduction equation are processed according to the cross-section element node grid to generate the rolled piece cross-section grid element heat balance equation and the roll grid element heat balance equation.

[0163] Specifically, the finite element formula based on the Galerkin method is applied to process the rolled piece heat conduction equation to generate the rolled piece cross-section grid element heat balance equation, and the heat balance equation in each grid element of the rolled piece cross-section is expressed as:

[0164]

[0165] Wherein, k b is the thermal conductivity of the rolled piece, with the unit of W / (m·K); is the grid element shape function; is the temperature of the rolled piece, with the unit of Kelvin (K); is the temperature of the i-th node in the e-th element (i=1, 2, 3, 4); ρ b is the density of the rolled piece, with the unit of kg / m 3 ; c b is the specific heat capacity of the rolled piece, with the unit of J / (kg·K); is the heat energy generated by the plastic deformation of the rolled piece, with the unit of W / m 3 ; Ω e is the area of the grid element; σ i is the deformation resistance of the rolled piece, with the unit of MPa, which can be obtained through the deformation resistance curve of the rolled piece; is the grid element shape function; is the strain rate of each node of the cross-section, which can be calculated through the cross-section element node grid; h con is the contact heat exchange coefficient between the rolled piece and the roll, with the unit of W / (m 2 ·K); q fric is the friction heat; τ is the friction stress on the contact surface, with the unit of N / m 2 ; Δv is the relative speed between the rolled piece and the roll, with the unit of m / s; T is the temperature of the roll, which is connected with the rolled piece equation; Γ e is the boundary of the grid element.

[0166] Specifically, the finite element formula based on the Galerkin method is applied to process the roll heat conduction equation, and a roll section grid element heat balance equation is generated, and the heat balance equation in each grid element of the roll section is expressed as:

[0167]

[0168] Wherein, r is an element position vector, which can be obtained by interpolation method r = ΣN i r i ; Ω e is the grid element area; is the grid element shape function; T r e is the roll temperature, unit: Kelvin (K); ρ r is the roll density, unit: kg / m 3 ; c r is the roll specific heat capacity, unit: J / (kg·K); q fric is the friction heat production; τ is the friction stress on the contact surface, unit: N / m 2 ; Δv is the relative speed of the rolled piece and the roll, unit: m / s; T is the rolled piece temperature, which is connected with the roll equation; Γ e is the grid element boundary; h con is the rolled piece and roll contact heat transfer coefficient, unit: W / (m 2 ·K).

[0169] Step 206, coupling the rolled piece section grid element heat balance equation and the roll grid element heat balance equation to generate a rolled piece-roll finite element coupling heat transfer model in the rod wire rolling process.

[0170] In the embodiment of the application, the heat balance equations of the rolled piece and the roll are coupled, and the element grid element matrix is assembled into the overall matrix of the rolled piece-roll system based on the finite element method, that is, the rolled piece-roll finite element coupling heat transfer model:

[0171]

[0172] Wherein, [M] is the system variable temperature matrix; [K] is the system stiffness matrix; {f} is the system constant matrix; {T} is the temperature vector, which contains all the to-be-determined node temperatures of the rolled piece and the roll {T} = {T b1 ,T b2 ...T bn ,T r1 ,T r2 ...T rm}; is the grid element shape function of the rolled piece; is the grid element shape function of the roll; Γ ebΓ is the grid element boundary of the rolled piece; er Ω is the grid element boundary of the roll; eb Ω is the grid element area of the rolled piece; er Ω is the grid element area of the roll; T is the temperature of the roll element of the i-th shape function; T is the temperature of the roll element of the j-th shape function; T is the temperature of the rolled piece element of the j-th shape function; con h is the contact heat exchange coefficient between the rolled piece and the roll; b k is the thermal conductivity of the rolled piece; r ρ is the conduction coefficient of the roll; b c is the density of the rolled piece; b c is the specific heat capacity of the rolled piece; r is the unit position vector, which can be obtained by interpolation r = ΣN i r i ρ r c is the density of the roll; r c is the specific heat capacity of the roll; q is the heat energy generated by plastic deformation of the rolled piece; fric T is the friction heat; b T is the temperature of the rolled piece; con h is the contact heat exchange coefficient between the rolled piece and the roll; r T is the temperature of the roll.

[0173] It is worth noting that in the above parameters, i, j represent the number of shape functions within an element, e b e r represent the rolled piece element and the roll element, respectively.

[0174] Step 207, according to the cross-sectional element node grid of the rolled piece before and after different rolling passes, the grid element area of the cross-sectional element node grid in the rolling process, the strain rate of each node of the cross section, and the grid element boundary are generated.

[0175] In the embodiment of the application, according to the cross-sectional geometry before and after rolling, the grid element area of the node grid of the cross-sectional node in the rolling process, the node strain rate, and the grid element boundary are obtained by using the geometric transformation method of step 202. Specifically, according to the position information of each node in the cross-sectional element node grid in the rolling process, the displacement data of each node is generated; according to the displacement data of each node and the statistical speed data, the strain ε i , strain rate

[0176] Step 208, according to the process parameters, the grid element area of the cross-sectional element node grid, and the strain rate of each node of the cross section, the plastic deformation heat is generated.

[0177] Specifically, the heat energy generated by the plastic deformation of the rolled piece can be calculated by the plastic deformation work:

[0178]

[0179] wherein, is the heat energy generated by the plastic deformation of the rolled piece, i.e., plastic deformation heat production, and the unit is W / m 3 ; Ω e is the area of the grid element; σ i is the deformation resistance of the rolled piece, and the unit is MPa, which can be obtained by the deformation resistance curve of the rolled piece; is the shape function of the grid element; is the strain rate of each node of the cross section, which can be calculated by the node grid of the cross section element.

[0180] Step 209, generating friction heat according to the grid element boundary and the process parameters.

[0181] In the embodiment of the application, the process parameters include rolling process parameters, and the rolling process parameters include but are not limited to the friction coefficient of the rolled piece and the roll and the deformation resistance of the rolled piece.

[0182] Specifically, by the friction heat is generated according to the grid element boundary, the friction coefficient of the rolled piece and the roll, the relative speed of the rolled piece and the roll and the deformation resistance of the rolled piece. Wherein, Δv is the relative speed of the rolled piece and the roll, and the unit is m / s; q fric is the friction heat; Γ e is the grid element boundary; σ i is the deformation resistance of the rolled piece.

[0183] Step 210, processing the time term of the temperature equation of the finite element coupled heat transfer model by Euler backward difference method to generate a simplified system finite element equation.

[0184] Specifically, the time term is processed by Euler backward difference method, and the system matrix can be simplified to a system finite element equation:

[0185] [A]{T nt+1}={b}

[0186]

[0187] wherein, n t is the time step number; Δt is the time step length; [M] is the system variable temperature matrix; [K] is the system stiffness matrix; {f} is the system constant matrix; {T} is the temperature vector; [A] is the first intermediate matrix; and {b} is the second intermediate matrix.

[0188] Step 211, according to the plastic deformation heat generation, friction heat generation and process parameters, the temperature equation of the system finite element equation is solved to generate the rolling piece cross-section temperature field.

[0189] Specifically, the plastic deformation heat generation, friction heat generation and process parameters are substituted into the temperature equation of the system finite element equation, the rolling piece roller coupling temperature equation set is solved, and the node temperature value of the rolling piece rolling process is obtained, that is, the rolling piece cross-section temperature field.

[0190] Step 212, according to the rolling piece cross-section temperature field, a two-dimensional cloud chart of the rolling piece cross-section temperature is drawn.

[0191] Specifically, a two-dimensional cloud chart of the rolling piece cross-section temperature is drawn according to the node coordinate temperature value through a drawing tool for subsequent business personnel to view.

[0192] The application can visualize the rolling piece cross-section temperature field, and display the cross-section temperature change of the rod wire in the whole process in the form of a temperature cloud chart, so that the user can quickly and intuitively obtain temperature information.

[0193] Further, while visualizing the temperature change of the rolling piece during the complete rolling process, the temperature values of the center and edge nodes of the rolling piece can be extracted according to requirements, and the actual measured temperature is checked to continuously improve the finite element coupling heat transfer model of the rolling piece-roller in the rod wire rolling process.

[0194] It should be noted that the acquisition, storage, use, processing and the like of the data in the technical solutions in the application comply with the relevant provisions of laws and regulations. The user information in the embodiments of the application is obtained through a legal and compliant way, and the acquisition, storage, use, processing and the like of the user information are authorized and agreed by the client.

[0195] It should be noted that the information collected in the application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with the relevant laws, regulations and standards of the country and region, necessary security measures are taken, do not violate public order and good customs, and provide corresponding operation entrances for users to choose authorization or refusal.

[0196] It should be noted that the technical solutions provided by the application provide corresponding operation entrances for users to choose to agree or refuse the automatic decision result; if the user chooses to refuse, the expert decision process is entered.

[0197] The technical scheme of the rolling piece cross-section temperature field generation method provided by the bar and wire rod production line full-process embodiment of the present application comprises the following steps: obtaining the process parameters and the initial geometric shape information of the cross section of a rolling piece in the current process of the bar and wire rod production line full-process; constructing a cross section unit node grid according to the initial geometric shape information of the cross section of the rolling piece; processing the rolling piece heat conduction equation and the roll heat conduction equation which are constructed in advance, generating the rolling piece cross section grid unit heat balance equation and the roll grid unit heat balance equation, based on the finite element formula and according to the cross section unit node grid; coupling and connecting the rolling piece cross section grid unit heat balance equation and the roll grid unit heat balance equation, generating the finite element coupled heat transfer model of the rolling piece-rolling mill in the bar and wire rod rolling process; generating the plastic deformation heat and the friction heat according to the cross section unit node grid of the geometric shape of the rolling piece before and after rolling and the process parameters of different rolling passes; solving the temperature equation of the finite element coupled heat transfer model according to the process parameters, the plastic deformation heat and the friction heat, generating the cross section temperature field of the rolling piece, and realizing the accurate calculation of the cross section temperature change of the bar and wire rod full-process production process, improving the prediction accuracy of the temperature in the bar and wire rod production process, and improving the calculation efficiency and applicability.

[0198] Figure 11 A structure diagram of a rolling piece cross-section temperature field generation device for a bar and wire rod production line full-process is provided for the embodiment of the present application. The device is used to execute the rolling piece cross-section temperature field generation method of the bar and wire rod production line full-process as shown in the figure. The device comprises an acquisition unit 11, a grid construction unit 12, a heat balance equation generation unit 13, a coupling unit 14, a heat generation unit 15 and a temperature field generation unit 16. Figure 11

[0199] The acquisition unit 11 is used to acquire the process parameters and the initial geometric shape information of the cross section of a rolling piece in the current process of the bar and wire rod production line full-process.

[0200] The grid construction unit 12 is used to construct a cross section unit node grid according to the initial geometric shape information of the cross section of the rolling piece.

[0201] The heat balance equation generation unit 13 is used to process the rolling piece heat conduction equation and the roll heat conduction equation which are constructed in advance, generate the rolling piece cross section grid unit heat balance equation and the roll grid unit heat balance equation, based on the finite element formula and according to the cross section unit node grid.

[0202] The coupling unit 14 is used to couple and connect the rolling piece cross section grid unit heat balance equation and the roll grid unit heat balance equation, generate the finite element coupled heat transfer model of the rolling piece-rolling mill in the bar and wire rod rolling process.

[0203] The heat generation unit 15 is used to generate the plastic deformation heat and the friction heat according to the cross section unit node grid of the geometric shape of the rolling piece before and after rolling and the process parameters of different rolling passes. ​

[0204] The temperature field generating unit 16 is configured to solve a temperature equation of a finite element coupled heat transfer model according to the process parameters, the plastic deformation heat generation and the friction heat generation, and generate a cross-section temperature field of the rolled piece.

[0205] In the embodiment of the present application, the cross-section geometry initial shape information of the rolled piece includes a shape type and a shape size, and the shape type is a rectangle; the mesh construction unit 12 is specifically configured to select an initial rectangular cross-section with a corresponding shape size according to the shape size of the rectangle, and construct a cross-section element node mesh of the rectangle.

[0206] In the embodiment of the present application, the shape type is a non-rectangle; the mesh construction unit 12 is specifically configured to perform scaling processing on the initial cross-section of the rolled piece according to the shape size, construct an initial rectangular mesh of the rolled piece according to a specified cross-section ratio and a scaling ratio, and generate a cross-section element node mesh of the non-rectangle according to the nodes of the initial rectangular mesh of the rolled piece and the shape size of the cross-section geometry initial shape information of the rolled piece in different rolling passes.

[0207] In the embodiment of the present application, the process parameters include rolling process parameters, cooling process parameters, material thermal physical property data and thermodynamic constants; the device further includes a rolled piece control equation construction unit 17, a rolled piece boundary condition construction unit 18 and a rolled piece heat conduction equation construction unit 19.

[0208] The rolled piece control equation construction unit 17 is configured to construct a rolled piece heat conduction control equation according to the material thermal physical property data.

[0209] The rolled piece boundary condition construction unit 18 is configured to construct a rolled piece heat conduction boundary condition according to the rolling process parameters, the cooling process parameters and the thermodynamic constants.

[0210] The rolled piece heat conduction equation construction unit 19 is configured to generate a rolled piece heat conduction equation according to the rolled piece heat conduction control equation and the rolled piece heat conduction boundary condition.

[0211] In the embodiment of the present application, the process parameters include rolling process parameters; the device further includes a roll control boundary condition construction unit 20 and a roll heat conduction equation construction unit 21.

[0212] The roll control boundary condition construction unit 20 is configured to construct a roll heat conduction control equation and a roll heat conduction boundary condition according to the rolling process parameters.

[0213] The roll heat conduction equation construction unit 21 is configured to generate a roll heat conduction equation according to a preset roll heat conduction initial condition, the roll heat conduction control equation and the roll heat conduction boundary condition.

[0214] In the embodiment of the present application, the heat generation unit 15 is specifically configured to generate the grid element area of the rolling process cross-section element node grid, the strain rate of each node of the cross-section, and the grid element boundary according to the cross-section element node grid of the geometric shape of the rolled piece before and after different rolling passes; generate plastic deformation heat according to the process parameters, the grid element area of the cross-section element node grid, and the strain rate of each node of the cross-section; and generate friction heat according to the grid element boundary and the process parameters.

[0215] In the embodiment of the present application, the temperature field generation unit 16 is specifically configured to process the time term of the temperature equation of the finite element coupled heat transfer model by Euler backward difference method to generate a simplified system finite element equation; and solve the temperature equation of the system finite element equation to generate the cross-section temperature field of the rolled piece according to the plastic deformation heat, the friction heat, and the process parameters.

[0216] In the embodiment of the present application, the device further comprises a drawing unit 22.

[0217] The drawing unit 22 is configured to draw a two-dimensional cloud chart of the cross-section temperature of the rolled piece according to the cross-section temperature field of the rolled piece.

[0218] In the scheme of the embodiment of the present application, the process parameters and the initial shape information of the cross-section of the rolled piece of the current process in the whole process of the rod wire production line are acquired; the cross-section element node grid is constructed according to the initial shape information of the cross-section of the rolled piece; the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller are processed based on the finite element formula to generate the rolled piece cross-section grid element heat balance equation and the roller grid element heat balance equation according to the cross-section element node grid; the rolled piece cross-section grid element heat balance equation and the roller grid element heat balance equation are coupled and connected to generate a finite element coupled heat transfer model of the rolled piece-roller in the rod wire rolling process; the plastic deformation heat and the friction heat are generated according to the cross-section element node grid of the geometric shape of the rolled piece before and after different rolling passes and the process parameters; the temperature equation of the finite element coupled heat transfer model is solved to generate the cross-section temperature field of the rolled piece according to the process parameters, the plastic deformation heat, and the friction heat, so as to realize accurate calculation of the cross-section temperature change of the whole process production process of the rod wire, improve the prediction accuracy of the temperature of the rod wire production process, and improve the calculation efficiency and applicability.

[0219] The system, device, module or unit illustrated in the above embodiments can be specifically implemented by a computer chip or entity, or by a product with certain functions. A typical implementation device is a computer device, specifically, the computer device may, for example, be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an electronic mail device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0220] The embodiment of the present application provides a computer device, comprising a memory and a processor, the memory is used for storing information comprising program instructions, the processor is used for controlling execution of the program instructions, the program instructions are loaded and executed by the processor to realize each step of the embodiment of the above-mentioned rolling piece cross section temperature field generation method of the whole process of a rod wire production line, and specific description can be referred to the above-mentioned embodiment of the rolling piece cross section temperature field generation method of the whole process of a rod wire production line.

[0221] Reference is made below Figure 12 which shows a structural schematic diagram of a computer device 600 suitable for being used to realize the embodiment of the present application.

[0222] As Figure 12 shown, the computer device 600 comprises a central processing unit (CPU) 601, which can perform various appropriate work and processing according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 to a random access memory (RAM) 603. In the RAM 603, various programs and data required for operation of the computer device 600 are also stored. The CPU 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0223] The following components are connected to the I / O interface 605: an input portion 606 comprising a keyboard, a mouse, and the like; an output portion 607 comprising a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker, and the like; a storage portion 608 comprising a hard disk, and the like; and a communication portion 609 comprising a network interface card such as a LAN card, a modem, and the like. The communication portion 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like is mounted on the drive 610 as needed, so that a computer program read therefrom is installed in the storage portion 608 as needed.

[0224] In particular, according to the embodiment of the present application, the processes described above with reference to the flowcharts can be realized as a computer software program. For example, the embodiment of the present application comprises a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network by the communication portion 609, and / or installed from the removable medium 611.

[0225] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0226] For the convenience of description, the above device is described as various units described respectively in function. Of course, in the implementation of the present application, the functions of each unit can be implemented in the same or more software and / or hardware.

[0227] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the computer or other programmable data processing device produce a device that implements the functions specified in the flowchart and / or block diagram. Figure 1 The functions specified in one or more flows and / or blocks Figure 1 The functions specified in one or more flows and / or blocks

[0228] These computer program instructions can also be stored in a computer-readable memory that can guide the computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including instruction devices that implement the functions specified in the flowchart and / or block diagram. Figure 1 The functions specified in one or more flows and / or blocks Figure 1 The functions specified in one or more flows and / or blocks

[0229] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 Figure 1

[0230] It should also be noted that the term "comprising" or "including" or any other variation thereof is 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 can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0231] The acquisition, storage, use, processing, etc. of data in the technical solutions of the present application comply with relevant provisions of national laws and regulations.

[0232] It should be noted that in the embodiments of the present application, some existing industry solutions of software, components, models, etc. may be mentioned, which should be considered as exemplary, and the purpose is only to illustrate the feasibility of the implementation of the technical solutions of the present application, but it does not mean that the applicant has or will necessarily use the solutions.

[0233] Those skilled in the art will understand that the embodiments of the present application can be provided as a method, system or computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0234] The present application can be described in the general context of computer-executable instructions, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The present application can also be practiced in a distributed computing environment where tasks are performed by remote processing devices that are connected through a communication network. In a distributed computing environment, program modules can be located in both local and remote computer storage media including storage devices.

[0235] ​​The various embodiments in the specification are described in progressive manner, and the same or similar parts among the various embodiments can be mutually referred to, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0236] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A method for generating a temperature field of a rolled piece in a bar wire production line, characterized by, The method comprises: Obtaining process parameters of a current process in a whole-process process of a rod wire production line and initial shape information of a cross-section of a rolled piece, wherein the process parameters comprise rolling process parameters, cooling process parameters, material thermal physical property data, thermodynamic constants and rolling process parameters; According to the initial shape information of the cross-section of the rolled piece, a cross-section unit node grid is constructed; According to the material thermal physical property data, a rolled piece heat conduction control equation is constructed; According to the rolling process parameters, the cooling process parameters and the thermodynamic constants, a rolled piece heat conduction boundary condition is constructed; According to the rolled piece heat conduction control equation and the rolled piece heat conduction boundary condition, the rolled piece heat conduction equation is generated; According to the rolling process parameters, a roller heat conduction control equation and a roller heat conduction boundary condition are constructed; According to the preset roller heat conduction initial condition, the roller heat conduction control equation and the roller heat conduction boundary condition, the roller heat conduction equation is generated; Based on a finite element formula, according to the cross-section unit node grid, the pre-constructed rolled piece heat conduction equation and the roller heat conduction equation are processed to generate a rolled piece cross-section grid unit heat balance equation and a roller grid unit heat balance equation; The rolled piece cross-section grid unit heat balance equation and the roller grid unit heat balance equation are coupled and connected to generate a finite element coupled heat transfer model of a rolled piece-roller in a rod wire rolling process; According to the cross-section unit node grid of the geometric shape before and after rolling of the rolled piece in different rolling passes and the process parameters, plastic deformation heat and friction heat are generated; According to the process parameters, the plastic deformation heat and the friction heat, a temperature equation of the finite element coupled heat transfer model is solved to generate a rolled piece cross-section temperature field, specifically comprising: The time term of the temperature equation of the finite element coupled heat transfer model is processed by Euler backward difference method to generate a simplified system finite element equation; According to the plastic deformation heat, the friction heat and the process parameters, the temperature equation of the system finite element equation is solved to generate a rolled piece cross-section temperature field.

2. The method according to claim 1, characterized in that, The initial shape information of the cross-section of the rolled piece comprises a shape type and a shape size, and the shape type is a rectangle; According to the initial shape information of the cross-section of the rolled piece, the cross-section unit node grid is constructed, comprising: According to the shape size, an initial rectangular cross-section of the corresponding shape size is selected to construct a rectangular cross-section unit node grid.

3. The method according to claim 2, characterized in that, The shape type is a non-rectangular shape; According to the initial shape information of the cross-section of the rolled piece, the cross-section unit node grid is constructed, comprising: According to the shape size, the initial cross-section of the rolled piece is scaled according to the specified cross-section ratio and the scaling ratio to construct an initial rectangular grid of the rolled piece; According to the nodes of the initial rectangular grid of the rolled piece and the shape size of the initial shape information of the cross-section of the rolled piece in different rolling passes, a non-rectangular cross-section unit node grid is generated.

4. The method according to claim 3, characterized in that, According to the cross-section unit node grid of the geometric shape before and after rolling of the rolled piece in different rolling passes and the process parameters, plastic deformation heat and friction heat are generated, comprising: According to the cross section element node grid of the geometry shape of the rolled piece before and after different rolling passes, a grid element area of the cross section element node grid in the rolling process, a strain rate of each node of the cross section, and a grid element boundary are generated; According to the process parameters, the grid element area of the cross section element node grid, and the strain rate of each node of the cross section, plastic deformation heat generation is generated; According to the grid element boundary and the process parameters, friction heat generation is generated.

5. The method according to claim 1, characterized in that, After the temperature equation of the finite element coupled heat transfer model is solved according to the process parameters and the cross section element node grid, and the cross section temperature field of the rolled piece is generated, the method further comprises the following steps: According to the cross section temperature field of the rolled piece, a two-dimensional cloud chart of the cross section temperature of the rolled piece is drawn.

6. A rolling stock cross-sectional temperature field generating device for a bar wire production line full process, characterized in that, The device comprises: An acquisition unit is configured to acquire process parameters of a current process in a whole-process process of a rod wire production line and cross section geometry initial shape information of a rolled piece, wherein the process parameters comprise rolling process parameters, cooling process parameters, material thermal physical property data, thermodynamic constants, and rolling process parameters; A grid construction unit is configured to construct a cross section element node grid according to the cross section geometry initial shape information of the rolled piece; A heat balance equation generation unit is configured to generate a rolled piece cross section grid element heat balance equation and a roll grid element heat balance equation by processing a pre-constructed rolled piece heat conduction equation and a roll heat conduction equation according to the cross section element node grid based on a finite element formula; A coupling unit is configured to couple and connect the rolled piece cross section grid element heat balance equation and the roll grid element heat balance equation to generate a finite element coupled heat transfer model of a rolled piece-roll in a rod wire rolling process; A heat generation unit is configured to generate plastic deformation heat generation and friction heat generation according to the cross section element node grid of the geometry shape of the rolled piece before and after different rolling passes and process parameters; A temperature field generation unit is configured to solve a temperature equation of the finite element coupled heat transfer model according to the process parameters, the plastic deformation heat generation, and the friction heat generation to generate a cross section temperature field of the rolled piece. The device further comprises: A rolled piece control equation construction unit is configured to construct a rolled piece heat conduction control equation according to the material thermal physical property data; A rolled piece boundary condition construction unit is configured to construct a rolled piece heat conduction boundary condition according to the rolling process parameters, the cooling process parameters, and the thermodynamic constants; A rolled piece heat conduction equation construction unit is configured to generate the rolled piece heat conduction equation according to the rolled piece heat conduction control equation and the rolled piece heat conduction boundary condition; A roll control boundary condition construction unit is configured to construct a roll heat conduction control equation and a roll heat conduction boundary condition according to the rolling process parameters; A roll heat conduction equation construction unit is configured to generate the roll heat conduction equation according to a preset roll heat conduction initial condition, the roll heat conduction control equation, and the roll heat conduction boundary condition; The temperature field generation unit is specifically configured to process a time item of the temperature equation of the finite element coupled heat transfer model by using an Euler backward difference method to generate a simplified system finite element equation, and solve a temperature equation of the system finite element equation according to the plastic deformation heat generation, the friction heat generation, and the process parameters to generate a cross section temperature field of the rolled piece.

7. The rolling stock cross-section temperature field generating device for a bar and wire production line full process according to claim 6, characterized in that, The initial shape information of the rolling piece cross section geometry includes a shape type and a shape size, and the shape type is a rectangle; The grid construction unit is specifically configured to select an initial rectangular cross section with a corresponding shape size according to the shape size of the rectangle, and construct a cross section unit node grid of the rectangle.

8. The rolling stock cross-section temperature field generating device for a bar and wire production line full process according to claim 7, characterized in that, The shape type is a non-rectangle; The grid construction unit is specifically configured to perform scaling processing on the initial cross section of the rolling piece according to the shape size according to the specified cross section ratio and scaling ratio, construct an initial rectangular grid of the rolling piece, and perform geometric transformation on the initial rectangular grid of the rolling piece and the shape size of the initial shape information of the cross section geometry of the rolling piece in different rolling passes to generate a cross section unit node grid of a non-rectangle.

9. The rolling stock cross-section temperature field generating device for a bar and wire production line full process according to claim 6, characterized in that, The heat generation unit is specifically configured to generate grid cell areas, cross section node strain rates and grid cell boundaries of the cross section unit node grid of the rolling process according to the cross section unit node grids of the rolling piece before and after rolling in different rolling passes, generate plastic deformation heat according to the process parameters, the grid cell areas of the cross section unit node grid and the cross section node strain rates, and generate friction heat according to the grid cell boundaries and the process parameters. The device further comprises:

10. The rolling stock cross-section temperature field generating device for a bar and wire production line full process according to claim 6, characterized in that, A drawing unit configured to draw a two-dimensional cloud chart of the cross section temperature of the rolling piece according to the cross section temperature field of the rolling piece. The program is executed by the processor to implement the rolling piece cross section temperature field generation method of the whole process of the bar and wire production line according to any one of claims 1 to 5.

11. A computer readable medium having stored thereon a computer program, characterized in that, The program instructions are loaded and executed by the processor to implement the rolling piece cross section temperature field generation method of the whole process of the bar and wire production line according to any one of claims 1 to 5.

12. A computer device comprising a memory for storing information including program instructions, and a processor for controlling execution of the program instructions, characterized in that, The computer program / instructions are executed by the processor to implement the rolling piece cross section temperature field generation method of the whole process of the bar and wire production line according to any one of claims 1 to 5.

13. A computer program product comprising computer programs / instructions, characterized in that, ​

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