Method and device for generating temperature field of section of rolled piece in whole process of rod and wire production line

Abstract

The invention provides a rolled piece section temperature field generation method and device for the whole process of a rod and wire production line, and the method comprises the steps: constructing a section unit node grid according to the geometric initial shape information of a rolled piece section; based on a finite element formula, the rolled piece heat conduction equation and the roller heat conduction equation are processed according to the section unit node grids, a rolled piece section grid unit heat balance equation and a roller grid unit heat balance equation are generated, and a rolled piece-roller finite element coupling heat transfer model in the rod and wire rolling process is generated through coupling connection; generating plastic deformation heat production and friction heat production according to section element node grids and process parameters of geometrical shapes before and after rolling of rolled pieces of different rolling passes, solving a temperature equation of a finite element coupling heat transfer model, generating a rolled piece section temperature field, and realizing accurate calculation of section temperature change of a rod and wire whole-flow production process. The prediction precision of the temperature in the rod and wire production process is improved, and the calculation efficiency and applicability are improved.

Description

Technical Field

[0001] The present invention relates to the field of rolling technology, and in particular to a method and device for generating a temperature field of a rolled piece section in the entire process of a rod and wire production line. Background Art

[0002] Rods and wires are widely used in manufacturing, transportation, construction and other fields. In recent years, the steel industry has advocated sustainable production, and more companies have put forward higher requirements for the production cost, product quality and mechanical properties of rods and wires. Accurate prediction and control of temperature are crucial to the rolling process, cooling system, dimensional accuracy and organizational performance of rods and wires. It is an important way to improve production efficiency, reduce energy consumption and achieve green production. Therefore, the research on the temperature prediction and analysis system of rods and wires is of great significance for optimizing the factory design of rod and wire production lines, improving product quality and resource utilization. In related technologies, the application of finite element method to study the temperature field of rods and wires only stays in a specific rolling process, and does not fully predict and analyze the cross-sectional temperature of the entire process, which cannot meet the actual production needs, resulting in inaccurate generated temperature field, inability to achieve high-precision temperature forecasting, low calculation efficiency and poor applicability. Summary of the invention

[0003] One object of the present invention is to provide a method for generating a cross-section temperature field of a rolled piece in the entire process of a rod and wire production line, so as to achieve accurate calculation of the cross-section temperature change of the entire production process of the rod and wire, improve the prediction accuracy of the temperature in the rod and wire production process, and enhance the calculation efficiency and applicability. Another object of the present invention is to provide a device for generating a cross-section temperature field of a rolled piece in the entire process of a rod and wire production line. Another object of the present invention is to provide a computer readable medium. Another object of the present invention is to provide a computer device.

[0004] In order to achieve the above objectives, the present invention discloses, on one hand, a method for generating a temperature field of a rolled piece section in the entire process of a bar and wire production line, comprising:

[0005] Obtain the process parameters of the current process in the entire process of the bar and wire production line and the initial geometric shape information of the rolled product section;

[0006] According to the initial geometric shape information of the rolled section, the section unit node mesh is constructed;

[0007] Based on the finite element formula and the section unit node mesh, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll are processed to generate the heat balance equation of the section mesh unit of the rolled piece and the heat balance equation of the roll mesh unit;

[0008] The heat balance equation of the mesh unit of the workpiece section and the heat balance equation of the roll mesh unit are coupled and connected to generate a finite element coupled heat transfer model of the workpiece and the roll during the bar and wire rolling process;

[0009] Generate heat generation due to plastic deformation and friction according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled pieces before and after rolling in different rolling passes;

[0010] According to the process parameters, heat generated by plastic deformation and friction, the temperature equation of the finite element coupled heat transfer model is solved to generate the temperature field of the rolled section.

[0011] Preferably, the initial geometric shape information of the section of the rolled piece includes shape type and shape size, and the shape type is a rectangle;

[0012] According to the initial geometry information of the rolled section, the section unit node mesh is constructed, including:

[0013] According to the shape and size of the rectangle, an initial rectangular section of the corresponding shape and size is selected to construct a rectangular section unit node mesh.

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

[0015] According to the initial geometry information of the rolled section, the section unit node mesh is constructed, including:

[0016] According to the specified section ratio and scaling ratio, the initial section of the rolled piece is scaled according to the shape and size to construct the initial rectangular grid of the rolled piece;

[0017] According to the shape and size of the nodes of the initial rectangular grid of the rolled piece and the initial shape information of the section geometry of the rolled piece at different rolling passes, a geometric transformation is performed to generate a non-rectangular section unit node grid.

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

[0019] Before the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll are processed based on the finite element formula and the cross-section unit node mesh to generate the heat balance equation of the rolled piece cross-section mesh unit and the heat balance equation of the roll mesh unit, the method further includes:

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

[0021] According to rolling process parameters, cooling process parameters and thermodynamic constants, the heat conduction boundary conditions of the rolled piece are constructed;

[0022] The heat conduction equation of the rolled piece is generated according to the heat conduction control equation of the rolled piece and the heat conduction boundary conditions of the rolled piece.

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

[0024] Before the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll are processed based on the finite element formula and the cross-section unit node mesh to generate the heat balance equation of the rolled piece cross-section mesh unit and the heat balance equation of the roll mesh unit, the method further includes:

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

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

[0027] Preferably, the heat generation due to plastic deformation and the heat generation due to friction are generated according to the cross-section unit node grids and process parameters of the geometric shapes of the rolled pieces before and after rolling in different rolling passes, including:

[0028] According to the cross-section unit node mesh of the geometric shape of the rolled product before and after rolling in different rolling passes, the grid unit area of ​​the cross-section unit node mesh of the rolling process, the strain rate of each node of the cross-section and the grid unit boundary are generated;

[0029] Generate heat generation due to plastic deformation based on process parameters, mesh unit area of ​​cross-section unit node mesh and strain rate of each cross-section node;

[0030] Frictional heat generation is generated based on the grid cell boundaries and process parameters.

[0031] Preferably, according to the process parameters, heat generation by plastic deformation and heat generation by friction, the temperature equation of the finite element coupled heat transfer model is solved to generate the temperature field of the cross section of the rolled piece, including:

[0032] The time term of the temperature equation of the finite element coupled heat transfer model is processed by the Euler backward difference method to generate a simplified system finite element equation;

[0033] According to the heat generated by plastic deformation, friction and process parameters, the temperature equation of the system finite element equation is solved to generate the temperature field of the rolled section.

[0034] Preferably, after solving the temperature equation of the finite element coupled heat transfer model according to the process parameters and the cross-section unit node grid to generate the cross-section temperature field of the rolled piece, the method further includes:

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

[0036] The present invention also discloses a device for generating a temperature field of a rolled piece section in the entire process of a rod and wire production line, comprising:

[0037] An acquisition unit is used to acquire the process parameters of the current process in the whole process of the rod and wire production line and the initial geometric shape information of the cross section of the rolled piece;

[0038] A mesh construction unit is used to construct a cross-section unit node mesh according to the initial geometric shape information of the rolled section;

[0039] A heat balance equation generating unit is used to process the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll based on the finite element formula and the cross-section unit node mesh, and generate the heat balance equation of the cross-section mesh unit of the rolled piece and the heat balance equation of the roll mesh unit;

[0040] A coupling unit is used to couple the heat balance equation of the mesh unit of the rolled product section with the heat balance equation of the mesh unit of the roll to generate a finite element coupled heat transfer model of the rolled product and the roll during the bar and wire rolling process;

[0041] A heat generation unit is used to generate heat generated by plastic deformation and heat generated by friction according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled pieces before and after rolling in different rolling passes;

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

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

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

[0045] Preferably, the shape type is non-rectangular;

[0046] The grid construction unit is specifically used to scale the initial section of the rolled piece according to the specified section ratio and scaling ratio and according to the shape and size, so as to construct the initial rectangular grid of the rolled piece; perform geometric transformation according to the shape and size of the nodes of the initial rectangular grid of the rolled piece and the initial shape information of the section geometry of the rolled piece in different rolling passes, so as to generate a non-rectangular section unit node grid.

[0047] Preferably, the process parameters include rolling process parameters, cooling process parameters, material thermal properties data and thermodynamic constants;

[0048] The device also includes:

[0049] The rolling piece control equation construction unit is used to construct the rolling piece heat conduction control equation according to the material thermal property data;

[0050] The rolling piece boundary condition construction unit is used to construct the rolling piece heat conduction boundary condition according to the rolling process parameters, cooling process parameters and thermodynamic constants;

[0051] The heat conduction equation construction unit of the rolled piece is used to generate the heat conduction equation of the rolled piece according to the heat conduction control equation of the rolled piece and the heat conduction boundary conditions of the rolled piece.

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

[0053] The device also includes:

[0054] Roller control boundary condition construction unit, used to construct roller heat conduction control equation and roller heat conduction boundary condition according to rolling process parameters;

[0055] The roller heat conduction equation construction unit is used to generate the roller heat conduction equation according to the preset roller heat conduction initial conditions, roller heat conduction control equation and roller heat conduction boundary conditions.

[0056] Preferably, the heat generation unit is specifically used to generate the grid unit area of ​​the section unit node grid of the rolling process, the strain rate of each node of the section and the grid unit boundary according to the section unit node grid of the geometric shape of the rolled piece before and after rolling in different rolling passes; generate plastic deformation heat according to the process parameters, the grid unit area of ​​the section unit node grid and the strain rate of each node of the section; generate friction heat according to the grid unit boundary and process parameters.

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

[0058] Preferably, the device further comprises:

[0059] The drawing unit is used to draw a two-dimensional cloud diagram of the cross-section temperature of the rolled piece according to the cross-section temperature field of the rolled piece.

[0060] The present invention also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0061] The present invention also discloses a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, the processor is used to control the execution of program instructions, and the processor implements the above method when executing the program.

[0062] The present invention also discloses a computer program product, including a computer program / instruction, and the method described above is implemented when the computer program / instruction is executed by a processor.

[0063] The present invention obtains process parameters of the current process in the full-process process of the rod and wire production line and information on the initial geometric shape of the cross-section of the rolled piece; constructs a cross-section unit node grid according to the information on the initial geometric shape of the cross-section of the rolled piece; based on the finite element formula, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller 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-roller in the process of rolling the rod and wire; according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled piece before and after rolling of different rolling passes, plastic deformation heat generation and friction heat generation are generated; according to the process parameters, plastic deformation heat generation and friction heat generation, the temperature equation of the finite element coupled heat transfer model is solved to generate a cross-section temperature field of the rolled piece, so as to achieve accurate calculation of the cross-section temperature change of the full-process production process of the rod and wire, improve the prediction accuracy of the temperature in the rod and wire production process, and improve the calculation efficiency and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 A flow chart of a method for generating a cross-section temperature field of a rolled piece in the entire process of a bar and wire production line provided by an embodiment of the present invention;

[0066] Figure 2 A flow chart of another method for generating a cross-section temperature field of a rolled piece in the entire process of a rod and wire production line provided by an embodiment of the present invention;

[0067] Figure 3 A schematic diagram of a roll gap shape of a roughing mill group in a rolling pass provided by an embodiment of the present invention;

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

[0069] Figure 5 A schematic diagram of node distribution for geometric transformation of a mesh shape of a rolled product cross section provided by an embodiment of the present invention;

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

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

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

[0073] Fig. 9 A schematic diagram of a coupled heat transfer model of a bar or wire rolled product and a rolling roller provided in an embodiment of the present invention;

[0074] Fig.10 A schematic diagram of a rod and wire rolling mill heat transfer mathematical model provided in an embodiment of the present invention;

[0075] Fig.11 A schematic diagram of the structure of a device for generating a temperature field of a rolled piece cross section in the entire process of a bar and wire production line provided by an embodiment of the present invention;

[0076] Fig.12 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0077] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] It should be noted that the method and device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line disclosed in the present application can be used in the field of artificial intelligence technology, and can also be used in any field outside the field of artificial intelligence technology. The application field of the method and device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line disclosed in the present application is not limited.

[0079] In order to facilitate the understanding of the technical solution provided by the present application, the relevant contents of the technical solution of the present application are first explained below. The production process of rods and wires mainly includes dephosphorization, rough rolling, intermediate rolling, finishing rolling, cooling, wire drawing, etc. The complex metal deformation in the whole process and the different heat exchange methods in each process lead to uneven cross-sectional temperature distribution of the rolled piece. At present, on-site measurements can only collect the surface temperature of the rolled piece, and the core temperature cannot be determined. It is impossible to obtain accurate temperature information of the entire process, so it is impossible to achieve high-precision control of the microstructure and properties of the material. In order to realize the accurate prediction of the temperature in the rod and wire production process and the high-precision control of the microstructure and properties, it is very necessary to develop a full-process temperature field prediction model for rods and wires.

[0080] Intelligent production of rods and wires and precise process control are the key to improving product quality. Accurate prediction and control of temperature are crucial to the microstructure and mechanical properties of the products. At the same time, it can effectively reduce costs, increase production, achieve energy conservation and emission reduction, and green manufacturing. At present, the rod and wire production line has the hardware conditions for controlling rolling and cooling, but in order to formulate a reasonable rolling process specification, it is also necessary to accurately predict the cross-sectional temperature changes of the entire process flow of the rolled piece. The present invention takes precise control of the rolled piece temperature, optimization of the rolling strategy, and improvement of production efficiency as research goals. Based on the finite element method and the principle of heat transfer, according to the actual production process and process parameters of the rod and wire production line, a high-precision full-process temperature field prediction model of the rod and wire rolled piece coupled with the roller is established to achieve accurate calculation of the cross-sectional temperature changes of the full-process production process of the rod and wire. The successful application of this invention can improve the prediction accuracy of the temperature of the rod and wire production process, enhance the ability to regulate the product structure and performance, provide technical support for optimizing the rolling process specification, provide a theoretical basis for the precise control of the production process, reduce production costs, improve product quality, and improve production efficiency.

[0081] The following takes the cross-section temperature field generating device of the whole process of the rod and wire production line as an example to illustrate the implementation process of the cross-section temperature field generating method of the whole process of the rod and wire production line provided by the embodiment of the present invention. It can be understood that the execution subject of the cross-section temperature field generating method of the whole process of the rod and wire production line provided by the embodiment of the present invention includes but is not limited to the cross-section temperature field generating device of the whole process of the rod and wire production line.

[0082] Figure 1 A flow chart of a method for generating a cross-section temperature field of a rolled piece in a full process of a bar and wire production line provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes:

[0083] Step 101: Obtain process parameters of the current process in the entire process of the rod and wire production line and information on the initial geometric shape of the cross section of the rolled piece.

[0084] In the embodiment of the present invention, at least one process in the whole process of bar and wire production is selected, including heating furnace heating, rough rolling, intermediate rolling, finishing rolling, air cooling between passes and water cooling. According to the specific process selected, the process parameters related to the process are input. The geometric cross-section shape and size of the rolled piece before and after rolling are input. For complex geometric cross-sections, they can be described by inputting function equations.

[0085] Step 102: construct a cross-section unit node grid according to the initial geometric shape information of the rolled piece cross section.

[0086] In the embodiment of the present invention, a cross-section unit node mesh is established. If the initial blank is rectangular, an initial rectangular section of the same size can be directly selected to establish a finite element mesh. If the initial blank is not rectangular, it is necessary to first establish an initial rectangular section mesh, and then obtain a node mesh of a complex cross-section shape through geometric transformation.

[0087] Step 103: Based on the finite element formula and the section unit node mesh, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller are processed to generate the heat balance equation of the section mesh unit of the rolled piece and the heat balance equation of the mesh unit of the roller.

[0088] In the embodiment of the present invention, the heat conduction differential equation of the workpiece and the roller is constructed according to the roll gap shape and boundary conditions of the rollers in the rolling process.

[0089] Step 104: Couple the heat balance equation of the mesh unit of the workpiece section and the heat balance equation of the roll mesh unit to generate a finite element coupled heat transfer model of the workpiece and the roll during the bar and wire rolling process.

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

[0091] Step 105 , generating heat generation due to plastic deformation and heat generation due to friction according to the cross-section unit node mesh and process parameters of the geometric shapes of the rolled piece before and after rolling in different rolling passes.

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

[0093] In the embodiment of the present invention, the temperature equations of the workpiece and the roll nodes are solved to obtain the temperature field distribution of the cross section of the workpiece.

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

[0095] Figure 2 A flow chart of another method for generating a cross-section temperature field of a rolled piece in a full process of a bar and wire production line provided by an embodiment of the present invention, such as Figure 2 As shown, the method includes:

[0096] Step 201: Obtain process parameters of the current process in the entire process of the rod and wire production line and information on the initial geometric shape of the cross section of the rolled piece.

[0097] In the embodiment of the present invention, each step is executed by a device for generating a temperature field on a section of a rolled piece in the entire process of a rod and wire production line.

[0098] In the embodiment of the present invention, according to the full process of the rod and wire production line, at least one process is selected and the process parameters required for the process are obtained. The full process includes heating furnace heating, dephosphorization, rough rolling, intermediate rolling, finishing rolling, air cooling between passes and water cooling. Specifically, according to the process specification of the rod and wire production line, at least one process input is selected or imported into the rod and wire rolling program table. According to the selected specific process, the process parameters related to the process are input. For example, when the rough rolling process is selected, the rolling process parameters need to be input, 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 convection heat transfer coefficient between the rolled piece and the air, the air temperature, the emissivity, the temperature of the roll, the thermal conductivity of the roll, the density of the roll, the specific heat capacity of the roll, the contact heat transfer coefficient between the rolled piece and the roll, etc. Since there is metal plastic deformation heat in the rolling process, the deformation resistance curve of the specific steel type needs to be input.

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

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

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

[0102] The material thermophysical property data include but are not limited to the rolled piece temperature, rolled piece thermal conductivity, rolled piece density, rolled piece specific heat capacity, and the fitted material thermophysical property curve.

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

[0104] In the embodiment of the present invention, the cross-sectional geometric shape information of the rolled product in each process is obtained according to the roll gap shape of the rolling roller in the rolling process. The cross-sectional geometric initial shape information of the rolled product includes the shape type and shape size, and 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 roll gap shape of a rough rolling mill group provided in an embodiment of the present invention, such as Figure 3 As shown, during the rough rolling process, the rough rolling unit has a total of 6 rolling mills, that is, 6 stand passes, the roll gap shape of the first two passes is rectangular, that is: the shape type of the cross-sectional geometry of the rolled piece is rectangular, and the shape size is 175mm×125mm; the roll gap shape of the third pass is elliptical, that is: the shape type of the cross-sectional geometry of the rolled piece is elliptical, and the shape size includes a major axis (2a) of 150mm and a minor axis (2b) of 90mm; the roll gap shape of the fourth pass is circular, that is: the shape type of the cross-sectional geometry of the rolled piece is circular, and the shape size includes a diameter (d) of 105mm; the roll gap shape of the fifth pass is elliptical, that is: the shape type of the cross-sectional geometry of the rolled piece is elliptical, and the shape size includes a major axis (2a) of 126mm and a minor axis (2b) of 62mm; the roll gap shape of the sixth pass is circular, that is: the shape type of the cross-sectional geometry of the rolled piece is circular, and the shape size includes a diameter (d) of 77mm. If the initial billet is a 175mm×125mm rectangular billet, the cross-sectional shape after passing through the rough rolling unit is a round bar with a diameter of 77mm.

[0105] It is worth mentioning that complex geometric sections can be described by inputting shape function equations.

[0106] Step 202: construct a cross-section unit node grid according to the initial geometric shape information of the rolled piece cross section.

[0107] In the process of rolling bars and wires, the cross-sectional geometric shapes of the rolled pieces after each rolling pass are different according to the hole shape of the rolls. The present invention takes rectangle, circle and ellipse as examples to propose a method for constructing and transforming a unit grid during rolling deformation. It is worth noting that the cross-sectional shapes of the rolled pieces are not limited to these three, and this method can also be used for more complex geometric shapes.

[0108] If the shape type of the initial shape information of the rolled product section is rectangular, select the initial rectangular section of the corresponding shape and size according to the shape and size of the rectangle, and construct the rectangular section unit node mesh. The geometric shape and heat transfer mode of the bar and wire section are symmetrical in the width and thickness directions, so a quarter of the section is taken for calculation, and the heat flux in the direction perpendicular to the symmetry axis is zero. Figure 4 A schematic diagram of a rectangular cross-section grid distribution provided by an embodiment of the present invention, such as Figure 4 As shown in the figure, a quadrilateral unit grid is established with a rectangular section as the starting shape. Since the temperature change at the edge of the section is more significant than that at the center, the grid adopts a distribution form of dense outside and sparse inside.

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

[0110] It is worth noting that if the initial blank is not rectangular, it is necessary to first establish the initial mesh of the rectangular section, and then obtain the node mesh of the complex cross-sectional shape through geometric transformation. The mesh shape of the geometric section can be obtained from the rectangular section through geometric transformation, which is 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, that is, circular or elliptical, step 202 specifically includes:

[0112] Step 2021: scale the initial section of the rolled piece according to the specified cross-sectional ratio and scaling ratio and based on the shape and 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, take a 1 / 4 cross section, select 8 units in the length and width directions respectively, and take a scaling ratio of 0.8 (the length and width of the rectangular unit are 0.8 of the previous unit along the length and width of the cross section), and establish the initial rectangular grid.

[0114] Step 2022: Perform geometric transformation based on the shape and size of the nodes of the initial rectangular grid of the rolled piece and the initial shape information of the cross-section geometry of the rolled piece at different rolling passes to generate a non-rectangular cross-section unit node grid.

[0115] Specifically, the nodes of the rectangular edge are mapped to the edge of the rolled geometry by linear scaling. Figure 5 A schematic diagram of node distribution for geometric transformation of a mesh shape of a rolled product section provided by an embodiment of the present invention, such as Figure 5 As shown, for the nodes p1, p2, p3, p4 and p5 on the boundary of the initial rectangular network, the node p on the boundary of the rectangle is i (x i ,y i ) is connected to the symmetry center, and the intersection point of the connecting line and the geometric boundary after rolling is p' i That is, the position of the point after the geometric transformation, and the scaling ratio is β = op' i / op i , the transformed coordinates are p' i (βx i ,βy i ), that is, points p1, p2, p3, p4 and p5 on the initial rectangular boundary are transformed to p'1, ​​p'2, p'3, p'4 and p'5. For node p6 inside the initial rectangular network, the line connecting node p6 and o is extended to the rectangular boundary, intersecting the rectangular and post-rolling geometric boundaries at points q6 and q'6 respectively. According to the same scaling method, the coordinates of p'6 after transformation are

[0116] Figure 6 A schematic diagram of a circular cross-section unit node grid provided by an embodiment of the present invention; Figure 7 A schematic diagram of an elliptical cross-section unit node grid provided in an embodiment of the present invention.

[0117] by Figure 3 Taking the roll gap shape of the third pass in the example, the cross-section of the blank 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 a grid transformation process of an elliptical rolling process provided by an embodiment of the present invention, such as Figure 8 As shown, the inlet section is the shape of the outlet roll gap of the second pass, that is, a rectangle of 65 mm × 65 mm; after geometric transformation, the section shape of the outlet is an elliptical section unit node mesh 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 grid or initial non-matrix grid is the initial shape of the rolled piece. After different rolling passes, the cross-sectional shape will change, but the node grid scaling method is the same. This grid transformation method is not only used to construct a non-rectangular initial cross-sectional grid, but also applied to the grid adaptive algorithm for cross-sectional shape changes during the rolling process.

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

[0120] Fig. 9 A coupled heat transfer model of a bar and wire rolled product and a rolling roller is provided in an embodiment of the present invention, such as Fig. 9 As shown in the figure, the x-axis, y-axis and z-axis define a three-dimensional coordinate system. The solid circle represents the outer diameter of the roll, the dotted circle represents the inner diameter of the roll, the single arrow inside the roll represents the roll radius, and the single arrow on the outer tangent of the roll represents the direction of movement of the roll, that is, counterclockwise 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, Fig. 9 The figure shows the side symmetrical with respect to the axis of symmetry. The height of the rolled piece before rolling is H. Fig. 9 The value shown is H / 2; the height of the rolled piece after rolling is h, Fig. 9 Shown is h / 2.

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

[0122] Step 2031: Construct a heat conduction control equation for the rolled piece based on the material thermal property data.

[0123] In the embodiment of the present invention, the material thermal property data include but are not limited to the rolled piece temperature, rolled piece thermal conductivity, rolled piece density and rolled piece specific heat capacity.

[0124] During the rolling process, heat transfer includes the heat of metal plastic deformation, heat exchange between the workpiece and the roll, heat generated by friction between the workpiece and the roll, and heat convection between the workpiece and the air; heat transfer between passes and the wire-laying process includes heat convection and radiation between the workpiece and the air; during the cooling process, heat transfer is manifested as heat convection between the workpiece and water. According to the production process characteristics of bars and wires, ignoring 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 of the workpiece:

[0125]

[0126] Among them, T b k is the temperature of the rolled piece, in Kelvin (K); b is the thermal conductivity of the rolled piece, in W / (m·K); ρ b is the density of the rolled piece, in kg / m 3 ;cb is the specific heat capacity of the rolled piece, in J / (kg·K); It is the heat energy generated by the plastic deformation of the rolled piece, in W / m 3 .

[0127] Among them, the heat energy generated by the plastic deformation of the rolled piece can be calculated by the plastic deformation work:

[0128]

[0129] in, It is the heat energy generated by the plastic deformation of the rolled piece, in W / m 3 ;σ is the deformation resistance of the rolled piece, in MPa, which can be obtained through the deformation resistance curve of the rolled piece; is the strain rate of each node of the section, which can be calculated through the section unit node mesh.

[0130] Step 2032: construct the heat conduction boundary conditions of the rolled piece according to the rolling process parameters, cooling process parameters and thermodynamic constants.

[0131] In the embodiment of the present invention, the rolling process parameters include the contact heat transfer coefficient between the workpiece and the roller, the surface temperature of the roller, the friction stress, and the relative speed between the workpiece and the roller. The cooling process parameters include but are not limited to the ambient temperature, the heat transfer coefficient of the cooling process, and the cooling time. Thermodynamic constants include but are not limited to the Boltzmann constant and the emissivity.

[0132] In the embodiment of the present invention, the boundary conditions of the rolling deformation zone include the contact area between the workpiece and the roller, the heat exchange area between the workpiece and the air, and the convective heat exchange between the workpiece and the water.

[0133] The contact area between the workpiece and the roller consists of the contact heat exchange between the roller and the workpiece and the friction heat generation, and the boundary conditions are:

[0134]

[0135] q fric =τ|Δv|

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

[0137] The heat exchange area between the rolled product and the air consists of convection heat transfer and radiation heat transfer, and the boundary conditions are:

[0138]

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

[0140] The heat transfer mode of dephosphorization and cooling process is through convection heat transfer between rolled pieces and water, and the boundary conditions are:

[0141]

[0142] Where k is the thermal conductivity of the rolled piece; T b h is the temperature of the rolled piece, in Kelvin (K); w is the convection heat transfer coefficient with water, unit is W / (m 2 ·K); T w is the temperature of water in Kelvin (K).

[0143] Step 2033: Generate a heat conduction equation for the rolled piece according to the heat conduction control equation for the rolled piece and the heat conduction boundary conditions for the rolled piece.

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

[0145] Step 204: construct the roller heat conduction equation.

[0146] Fig.10 A schematic diagram of a rod and wire roller heat transfer mathematical model provided in an embodiment of the present invention, such as Fig.10 As shown, the x-axis and the r-axis define the roller heat transfer coordinate system, wherein r is the radial direction of the roller and x is the axial direction of the roller. The solid line represents the outer contour of the roller and the dotted circle represents the cross-sectional shape of the rolled piece. In the embodiment of the present invention, step 204 specifically includes:

[0147] Step 2041: construct the roller heat conduction control equation and roller heat conduction boundary conditions according to the rolling process parameters.

[0148] During the rolling process, the surface temperature of the working roll will change. In order to obtain a high-precision temperature field distribution on the cross section of the rolled product, a coupling relationship needs to be established between the heat conduction model of the roll and the rolled product. Ignoring the heat transfer of the roll along the circumferential direction and only considering the radial and axial directions, the heat conduction control equation of the rolled product is expressed as:

[0149]

[0150] Among them, r is the unit position vector, which can be obtained by interpolation r = ΣN i r i Get; k r is the roll conduction coefficient, in W / (m·K); T r is the roller temperature, in Kelvin (K); ρ r is the roller density, in kg / m 3 ;c r is the specific heat capacity of the roller, and its unit is J / (kg·K).

[0151] The heat conduction boundary conditions of the roller in the contact heat exchange part are:

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

[0153] At t>0,

[0154]

[0155] q fric =τ|Δv|

[0156]

[0157] Among them, k r is the roll conduction coefficient, in W / (m·K); T r is the roller temperature, in Kelvin (K); T b is the temperature of the rolled product, in Kelvin (K); R is the radius of the roll, in m; q fric is the frictional heat; τ is the friction stress on the contact surface, in N / m 2 ; Δv is the relative speed between the workpiece and the roller, in m / s; r * is the radius of the outer area, in mm.

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

[0159] Step 2042: Generate a roller heat conduction equation according to the preset roller heat conduction initial conditions, roller heat conduction control equation and roller heat conduction boundary conditions.

[0160] In the embodiment of the present invention, the initial condition is set as at time t=0, the initial temperature of the roller is T0T(r,x)=T0.

[0161] Specifically, the initial conditions of roller heat conduction, the roller heat conduction control equation, the boundary conditions of the heat exchange area between the workpiece and the air, the roller heat conduction boundary conditions of the contact heat exchange part, and the boundary conditions of the convective heat transfer between the workpiece and water are combined to generate the roller heat conduction equation.

[0162] Step 205: Based on the finite element formula and the section unit node mesh, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller are processed to generate the heat balance equation of the section mesh unit of the rolled piece and the heat balance equation of the mesh unit of the roller.

[0163] Specifically, the finite element formula based on the Galerkin method is used to process the heat conduction equation of the rolled piece to generate the heat balance equation of the mesh unit of the rolled piece section. The heat balance equation in each mesh unit of the rolled piece section is expressed as:

[0164]

[0165] Among them, k b is the thermal conductivity of the rolled piece, in W / (m·K); is the mesh cell shape function; is the temperature of the rolled product, in 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, in kg / m 3 ;c b is the specific heat capacity of the rolled piece, in J / (kg·K); It is the heat energy generated by the plastic deformation of the rolled piece, in W / m 3 ;Ω e is the grid unit area; σ i is the deformation resistance of the rolled piece, in MPa, which can be obtained through the deformation resistance curve of the rolled piece; is the mesh cell shape function; is the strain rate of each node of the section, which can be calculated through the section unit node mesh; h con is the contact heat transfer coefficient between the workpiece and the roller, in W / (m 2 ·K);q fric is the frictional heat; τ is the friction stress on the contact surface, in N / m 2 ; Δv is the relative speed between the workpiece and the roll, in m / s; T is the roll temperature, and the workpiece equation uses this temperature to connect with the roll; Γ e is the grid cell boundary.

[0166] Specifically, the finite element formula based on the Galerkin method is used to process the heat conduction equation of the roll to generate the heat balance equation of the roll section grid unit. The heat balance equation in each grid unit of the roll section is expressed as:

[0167]

[0168] Among them, r is the unit position vector, which can be obtained by interpolation r = ΣN i r i Get; Ω e is the grid unit area; is the mesh unit shape function; T r e is the roller temperature, in Kelvin (K); ρ r is the roller density, in kg / m 3 ;c r is the specific heat capacity of the roller, in J / (kg·K); q fric is the frictional heat; τ is the friction stress on the contact surface, in N / m 2 ; Δv is the relative speed between the workpiece and the roller, in m / s; T is the workpiece temperature, and the roller equation uses this temperature to connect the workpiece; Γ e is the grid cell boundary; h con is the contact heat transfer coefficient between the workpiece and the roller, in W / (m 2 ·K).

[0169] Step 206: Couple the heat balance equation of the mesh unit of the workpiece section and the heat balance equation of the mesh unit of the roll to generate a finite element coupled heat transfer model of the workpiece and the roll during the bar and wire rolling process.

[0170] In the embodiment of the present invention, the heat balance equations of the workpiece and the roller are coupled, and the unit grid element matrix is ​​assembled into an overall matrix of the workpiece-roller system based on the finite element method, that is, the finite element coupled heat transfer model of the workpiece-roller:

[0171]

[0172] Where [M] is the system temperature matrix; [K] is the system stiffness matrix; {f} is the system constant matrix; {T} is the temperature vector, which includes all the unknown node temperatures of the workpiece and the roll {T} = {T b1 ,T b2 ...T bn ,T r1 ,T r2 ...T rm}; is the mesh unit shape function of the rolled piece; is the grid unit shape function of the roller; Γ ebis the grid unit boundary of the rolled piece; Γ er is the grid unit boundary of the roller; Ω eb is the grid unit area of ​​the rolled piece; Ω er is the grid unit area of ​​the roller; is the temperature of the roll element of the i-th shape function; is the temperature of the roll element of the jth shape function; is the temperature of the rolled piece unit of the jth shape function; h con k is the contact heat transfer coefficient between the workpiece and the roller; b k is the thermal conductivity of the rolled piece; r is the roll conduction coefficient; ρ b is the density of rolled product; c b is the specific heat capacity of the rolled piece; r is the unit position vector, which can be obtained by interpolation method r = ΣN i r i Get; ρ r is the roller density; c r is the specific heat capacity of the roller; is the heat energy generated by the plastic deformation of the rolled piece; q fric is the frictional heat; T b h is the temperature of the rolled piece; con is the contact heat transfer coefficient between the workpiece and the roller; T r is the roller temperature.

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

[0174] Step 207, generating the grid unit area of ​​the cross-section unit node grid during the rolling process, the strain rate of each cross-section node and the grid unit boundary according to the cross-section unit node grid of the geometric shape of the rolled piece before and after rolling in different rolling passes.

[0175] In the embodiment of the present invention, according to the geometric shape of the section before and after rolling, the geometric transformation method of step 202 is used to obtain the grid unit area, node strain rate and grid unit boundary of the node grid of the section node during the rolling process. Specifically, according to the position information of each node in the node grid of the section unit during the rolling process, the displacement data of each node is generated; according to the displacement data of each node and the statistical velocity data, the strain amount ε of each node is calculated. i , strain rate

[0176] Step 208: Generate the heat generated by plastic deformation according to the process parameters, the mesh unit area of ​​the cross-section unit node mesh, and the strain rate of each cross-section node.

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

[0178]

[0179] in, It is the heat energy generated by the plastic deformation of the rolled piece, that is, heat generated by plastic deformation, with the unit of W / m 3 ;Ω e is the grid unit area; σ i is the deformation resistance of the rolled piece, in MPa, which can be obtained through the deformation resistance curve of the rolled piece; is the mesh cell shape function; is the strain rate of each node of the section, which can be calculated through the section unit node mesh.

[0180] Step 209: Generate friction heat generation according to the grid unit boundaries and process parameters.

[0181] In the embodiment of the present invention, the process parameters include rolling process parameters, and the rolling process parameters include but are not limited to the friction coefficient between the workpiece and the roller and the deformation resistance of the workpiece.

[0182] Specifically, through Frictional heat is generated for the grid unit boundary, the friction coefficient between the workpiece and the roller, the relative speed between the workpiece and the roller, and the deformation resistance of the workpiece. Where Δv is the relative speed between the workpiece and the roller, in m / s; q fric is the frictional heat; e is the grid cell boundary; σ i It is the deformation resistance of rolled piece.

[0183] Step 210: Process the time term of the temperature equation of the finite element coupled heat transfer model by using the 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 into the system finite element equation:

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

[0186]

[0187] Among them, n t is the time step number; Δt is the time step; [M] is the system temperature change 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: Solve the temperature equation of the system finite element equation according to the heat generated by plastic deformation, the heat generated by friction and the process parameters to generate the temperature field of the cross section of the rolled piece.

[0189] Specifically, the heat generated by plastic deformation, friction and process parameters are substituted into the temperature equation of the system finite element equation, and the temperature equation group of the rolled piece roller coupling is solved to obtain the node temperature values ​​of the rolled piece rolling process, that is, the temperature field of the rolled piece section.

[0190] Step 212: Draw a two-dimensional cloud diagram of the cross-section temperature of the rolled piece according to the cross-section temperature field of the rolled piece.

[0191] Specifically, a two-dimensional cloud diagram of the cross-section temperature of the rolled piece is drawn based on the node coordinate temperature values ​​through drawing tools for subsequent business personnel to view.

[0192] This application visualizes the temperature field of the cross-section of the rolled product and displays the temperature changes of the cross-section of the rod and wire throughout the entire process in the form of a temperature cloud map, making it easier for users to obtain temperature information more quickly and intuitively.

[0193] Furthermore, while visualizing the temperature changes of the rolled piece during the complete rolling process, the temperature values ​​of the center and edge nodes of the rolled piece can be extracted as required, and verified with the actual measured temperature, thereby continuously improving the finite element coupled heat transfer model of the rolled piece and the roller during the bar and wire rolling process.

[0194] It is worth noting that the acquisition, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of laws and regulations. The user information in the embodiments of this application is obtained through legal and compliant channels, and the acquisition, storage, use, and processing of user information are authorized and agreed by the customer.

[0195] It is worth noting that the information collected in this 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 relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0196] It is worth noting that the technical solution provided in this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0197] In the technical solution of the method for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line provided by an embodiment of the present invention, the process parameters of the current process in the whole process of the rod and wire production line and the initial geometric shape information of the cross-section of the rolled piece are obtained; according to the initial geometric shape information of the cross-section of the rolled piece, a cross-section unit node grid is constructed; based on the finite element formula, according to the cross-section unit node grid, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller are processed to generate the heat balance equation of the cross-section grid unit of the rolled piece and the 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 converted into the heat balance equation of the cross-section grid unit of the rolled piece. The heat balance equation of the roller grid unit is coupled and connected to generate a finite element coupled heat transfer model of the workpiece-roller during the rolling process of rod and wire; the plastic deformation heat generation and friction heat generation are generated according to the section unit node grid and process parameters of the geometric shape of the workpiece before and after rolling of different rolling passes; according to the process parameters, plastic deformation heat generation and friction heat generation, the temperature equation of the finite element coupled heat transfer model is solved to generate the cross-section temperature field of the workpiece, so as to realize the accurate calculation of the cross-section temperature change of the whole process production process of rod and wire, improve the prediction accuracy of the temperature in the rod and wire production process, and improve the calculation efficiency and applicability.

[0198] Fig.11 The present invention provides a schematic diagram of a device for generating a temperature field of a rolled piece section in a full process of a bar and wire production line, which is used to execute the method for generating a temperature field of a rolled piece section in a full process of a bar and wire production line. Fig.11 As shown, the device includes: 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.

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

[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 rolled piece cross section.

[0201] The heat balance equation generation unit 13 is used to process the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller based on the finite element formula and the section unit node grid, and generate the heat balance equation of the rolled piece section grid unit and the heat balance equation of the roller grid unit.

[0202] The coupling unit 14 is used to couple the heat balance equation of the mesh unit of the workpiece section and the heat balance equation of the roll mesh unit to generate a finite element coupled heat transfer model of the workpiece and the roll during the bar and wire rolling process.

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

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

[0205] In the embodiment of the present invention, the initial geometric shape information of the rolled section includes shape type and shape size, and the shape type is rectangular; the grid construction unit 12 is specifically used to select an initial rectangular section of corresponding shape size according to the rectangular shape size, and construct a rectangular section unit node grid.

[0206] In the embodiment of the present invention, the shape type is non-rectangular; the grid construction unit 12 is specifically used to scale the initial cross-section of the rolled piece according to the specified cross-section ratio and scaling ratio and according to the shape size, to construct the initial rectangular grid of the rolled piece; geometric transformation is performed according to the shape size of the nodes of the initial rectangular grid of the rolled piece and the initial shape information of the cross-section geometry of the rolled piece in different rolling passes, to generate a non-rectangular cross-section unit node grid.

[0207] In the embodiment of the present invention, the process parameters include rolling process parameters, cooling process parameters, material thermal properties data and thermodynamic constants; the device also 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 used to construct the rolled piece heat conduction control equation according to the material thermal property data.

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

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

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

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

[0213] The roller heat conduction equation construction unit 21 is used to generate the roller heat conduction equation according to the preset roller heat conduction initial conditions, roller heat conduction control equation and roller heat conduction boundary conditions.

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

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

[0216] In the embodiment of the present invention, the device further includes: a drawing unit 22 .

[0217] The drawing unit 22 is used to draw a two-dimensional cloud diagram 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 invention, the process parameters of the current process in the whole process of the rod and wire production line and the initial geometric shape information of the cross-section of the rolled piece are obtained; according to the initial geometric shape information of the cross-section of the rolled piece, the cross-section unit node grid is constructed; based on the finite element formula, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roller are processed according to the cross-section unit node grid to generate the heat balance equation of the cross-section grid unit of the rolled piece and the heat balance equation of the roller grid unit; the heat balance equation of the cross-section grid unit of the rolled piece and the heat balance equation of the roller grid unit are coupled and connected to generate a finite element coupled heat transfer model of the rolled piece-roller during the rolling process of the rod and wire; according to the cross-section unit node grid and process parameters of the geometric shape of the rolled piece before and after rolling of different rolling passes, the heat generation of plastic deformation and the heat generation of friction are generated; according to the process parameters, the heat generation of plastic deformation and the heat generation of friction, the temperature equation of the finite element coupled heat transfer model is solved to generate the cross-section temperature field of the rolled piece, so as to realize the accurate calculation of the cross-section temperature change of the whole process production process of the rod and wire, improve the prediction accuracy of the temperature in the rod and wire production process, and improve the calculation efficiency and applicability.

[0219] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device may be, for example, 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 email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0220] An embodiment of the present invention provides a computer device, including a memory and a processor, the memory is used to store information including program instructions, the processor is used to control the execution of the program instructions, and when the program instructions are loaded and executed by the processor, the steps of the embodiment of the method for generating the cross-section temperature field of a rolled piece in the whole process of the above-mentioned bar and wire production line are implemented. For a specific description, please refer to the embodiment of the method for generating the cross-section temperature field of a rolled piece in the whole process of the above-mentioned bar and wire production line.

[0221] Reference below Fig.12 , which shows a schematic diagram of the structure of a computer device 600 suitable for implementing an embodiment of the present application.

[0222] like Fig.12 As shown, the computer device 600 includes a central processing unit (CPU) 601, which can perform various appropriate operations and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage part 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the computer device 600 are also stored. The CPU 601, the ROM 602, and the RAM 603 are connected to each other via 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 section 606 including a keyboard, a mouse, etc.; an output section 607 including a cathode ray tube (CRT), a liquid crystal feedback device (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN card, a modem, etc. The communication section 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, etc., is installed on the drive 610 as needed, so that a computer program read therefrom is installed as needed as the storage section 608.

[0224] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 609, and / or installed from the removable medium 611.

[0225] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0226] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0227] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes 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 processor of 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 processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0228] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0229] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0230] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

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

[0232] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0233] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt 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.) that contain computer-usable program code.

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

[0235] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0236] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for generating a cross-section temperature field of a rolled piece in a full-process bar and wire production line, characterized in that: The method comprises: Obtain the process parameters of the current process in the entire process of the bar and wire production line and the initial geometric shape information of the rolled product section; Constructing a cross-section unit node grid according to the initial geometric shape information of the rolled piece cross section; Based on the finite element formula and the section unit node grid, the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll are processed to generate the heat balance equation of the section grid unit of the rolled piece and the heat balance equation of the roll grid unit; The heat balance equation of the mesh unit of the rolled product section and the heat balance equation of the mesh unit of the roll are coupled and connected to generate a finite element coupled heat transfer model of the rolled product and the roll during the bar and wire rolling process; Generate heat generation due to plastic deformation and friction according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled pieces before and after rolling in different rolling passes; According to the process parameters, heat generated by plastic deformation and heat generated by friction, the temperature equation of the finite element coupled heat transfer model is solved to generate the temperature field of the cross section of the rolled piece.

2. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 1, characterized in that: The initial geometric shape information of the rolled piece section includes shape type and shape size, and the shape type is a rectangle; The step of constructing a cross-section unit node grid according to the initial geometric shape information of the rolled piece cross section comprises: According to the shape and size of the rectangle, an initial rectangular section of the corresponding shape and size is selected to construct a rectangular section unit node mesh.

3. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 2, characterized in that: The shape type is non-rectangular; The step of constructing a cross-section unit node grid according to the initial geometric shape information of the rolled piece cross section comprises: According to the specified section ratio and scaling ratio, the initial section of the rolled piece is scaled according to the shape and size to construct an initial rectangular grid of the rolled piece; A geometric transformation is performed according to the shape and size of the nodes of the initial rectangular grid of the rolled piece and the geometric initial shape information of the section of the rolled piece at different rolling passes to generate a non-rectangular section unit node grid.

4. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 1, characterized in that: The process parameters include rolling process parameters, cooling process parameters, material thermal properties data and thermodynamic constants; Before the pre-constructed heat conduction equation of rolled piece and heat conduction equation of roll are processed based on the finite element formula and the section unit node grid to generate the heat balance equation of rolled piece section grid unit and the heat balance equation of roll grid unit, the method further includes: According to the material thermal property data, construct a heat conduction control equation for the rolled piece; Constructing heat conduction boundary conditions of the rolled piece according to the rolling process parameters, cooling process parameters and thermodynamic constants; The heat conduction equation of the rolled piece is generated according to the heat conduction control equation of the rolled piece and the heat conduction boundary conditions of the rolled piece.

5. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 1, characterized in that: The process parameters include rolling process parameters; Before the pre-constructed heat conduction equation of rolled piece and heat conduction equation of roll are processed based on the finite element formula and the section unit node grid to generate the heat balance equation of rolled piece section grid unit and the heat balance equation of roll grid unit, the method further includes: According to the rolling process parameters, constructing a roller heat conduction control equation and a roller heat conduction boundary condition; The roller heat conduction equation is generated according to the preset roller heat conduction initial condition, the roller heat conduction control equation and the roller heat conduction boundary condition.

6. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 3, characterized in that: The step of generating heat generated by plastic deformation and heat generated by friction according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled pieces before and after rolling of different rolling passes includes: According to the cross-section unit node mesh of the geometric shape of the rolled product before and after rolling in different rolling passes, the grid unit area of ​​the cross-section unit node mesh of the rolling process, the strain rate of each node of the cross-section and the grid unit boundary are generated; Generate plastic deformation heat generation according to the process parameters, the mesh unit area of ​​the cross-section unit node mesh and the strain rate of each cross-section node; Frictional heat generation is generated according to the grid unit boundaries and process parameters.

7. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 1, characterized in that: The step of solving the temperature equation of the finite element coupled heat transfer model according to the process parameters, heat generated by plastic deformation and heat generated by friction to generate the temperature field of the cross section of the rolled piece includes: The time term of the temperature equation of the finite element coupled heat transfer model is processed by the Euler backward difference method to generate a simplified system finite element equation; According to the heat generated by plastic deformation, the heat generated by friction and the process parameters, the temperature equation of the system finite element equation is solved to generate the temperature field of the cross section of the rolled piece.

8. The method for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 1, characterized in that: After solving the temperature equation of the finite element coupled heat transfer model according to the process parameters and the cross-section unit node grid to generate the cross-section temperature field of the rolled piece, the method further includes: According to the temperature field of the cross section of the rolled piece, a two-dimensional cloud diagram of the cross section temperature of the rolled piece is drawn.

9. A device for generating a temperature field of a rolled product section in the entire process of a bar and wire production line, characterized in that: The device comprises: An acquisition unit is used to acquire the process parameters of the current process in the whole process of the rod and wire production line and the initial geometric shape information of the cross section of the rolled piece; A mesh construction unit, used to construct a cross-section unit node mesh according to the initial geometric shape information of the rolled piece cross section; A heat balance equation generating unit is used to process the pre-constructed heat conduction equation of the rolled piece and the heat conduction equation of the roll according to the section unit node grid based on the finite element formula to generate the heat balance equation of the rolled piece section grid unit and the heat balance equation of the roll grid unit; A coupling unit is used to couple the heat balance equation of the mesh unit of the rolled product section with the heat balance equation of the mesh unit of the roll to generate a finite element coupled heat transfer model of the rolled product and the roll during the rolling process of the rod and wire; A heat generation unit is used to generate heat generated by plastic deformation and heat generated by friction according to the cross-section unit node grid and process parameters of the geometric shapes of the rolled pieces before and after rolling in different rolling passes; The temperature field generating unit is used to solve the temperature equation of the finite element coupled heat transfer model according to the process parameters, heat generated by plastic deformation and heat generated by friction, and generate the temperature field of the cross section of the rolled piece.

10. The device for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 9, characterized in that: The initial geometric shape information of the rolled piece section includes shape type and shape size, and the shape type is a rectangle; The grid construction unit is specifically used to select an initial rectangular section of corresponding shape and size according to the shape and size of the rectangle, and construct a rectangular section unit node grid.

11. The device for generating the cross-section temperature field of a rolled piece in the whole process of a bar and wire production line according to claim 10, characterized in that: The shape type is non-rectangular; The grid construction unit is specifically used to scale the initial section of the rolled piece according to the specified section ratio and scaling ratio and the shape size to construct the initial rectangular grid of the rolled piece; perform geometric transformation according to the shape size of the nodes of the initial rectangular grid of the rolled piece and the initial shape information of the section geometry of the rolled piece in different rolling passes to generate a non-rectangular section unit node grid.

12. The device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line according to claim 9, characterized in that: The process parameters include rolling process parameters, cooling process parameters, material thermal properties data and thermodynamic constants; The device also includes: A rolling piece control equation construction unit, used to construct a rolling piece heat conduction control equation according to the material thermal property data; A rolled piece boundary condition construction unit, used to construct a rolled piece heat conduction boundary condition according to the rolling process parameters, cooling process parameters and thermodynamic constants; The rolled piece heat conduction equation construction unit is used to generate the rolled piece heat conduction equation according to the rolled piece heat conduction control equation and the rolled piece heat conduction boundary conditions.

13. The device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line according to claim 9, characterized in that: The process parameters include rolling process parameters; The device also includes: A roller control boundary condition construction unit, used to construct a roller heat conduction control equation and a roller heat conduction boundary condition according to the rolling process parameters; The roller heat conduction equation construction unit is used to generate the roller heat conduction equation according to the preset roller heat conduction initial conditions, the roller heat conduction control equation and the roller heat conduction boundary conditions.

14. The device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line according to claim 9, characterized in that: The heat generation unit is specifically used to generate the grid unit area of ​​the cross-section unit node grid, the strain rate of each node of the cross-section and the grid unit boundary of the rolling process according to the cross-section unit node grid of the geometric shape of the rolled piece before and after rolling of different rolling passes; and generate the heat generated by plastic deformation 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; Frictional heat generation is generated according to the grid unit boundaries and process parameters.

15. The device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line according to claim 9, characterized in that: The temperature field generating unit is specifically used to process the time term of the temperature equation of the finite element coupled heat transfer model through the Euler backward difference method to generate a simplified system finite element equation; according to the heat generated by plastic deformation, friction heat generated and process parameters, the temperature equation of the system finite element equation is solved to generate the temperature field of the cross section of the rolled piece.

16. The device for generating the cross-section temperature field of a rolled piece in the whole process of a rod and wire production line according to claim 9, characterized in that: The device also includes: The drawing unit is used to draw a two-dimensional cloud diagram of the cross-section temperature of the rolled piece according to the cross-section temperature field of the rolled piece.

17. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it implements the method for generating the cross-section temperature field of a rolled piece in the entire process of a rod and wire production line as described in any one of claims 1 to 8.

18. A computer device comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, characterized in that: When the program instructions are loaded and executed by the processor, the method for generating the cross-section temperature field of the rolled piece in the whole process of the bar and wire production line as described in any one of claims 1 to 8 is implemented.

19. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by the processor, the method for generating the cross-section temperature field of the rolled piece in the entire process of the bar and wire production line as described in any one of claims 1 to 8 is implemented.

Images