Rolling parameter design method and device for thin-gauge wide and thick plate and electronic equipment

Abstract

The invention provides a rolling parameter design method and device for a thin-specification wide and thick plate and electronic equipment, and relates to the technical field of wide and thick plate rolling, and the method comprises the steps that a temperature correction model is built according to rolling process parameters of the thin-specification wide and thick plate based on the Fourier law, the temperature correction model is used for representing the change of the strip steel temperature at each position at different moments; discretization solving is conducted on the temperature correction model through a finite difference method, and the actual rolling temperature of the strip steel is obtained; the flattening contact arc length, the material deformation resistance and the stress state coefficient are obtained according to the actual rolling temperature of the strip steel; rolling force energy parameters are obtained through the flattening contact arc length, the material deformation resistance and the stress state coefficient, and the rolling force energy parameters comprise unit rolling force and total rolling force. According to the method, the accuracy of rolling force energy parameter calculation is improved, and the unit rolling force and the total rolling force which better meet actual requirements are obtained.

Description

Technical Field

[0001] This invention relates to the field of heavy plate rolling technology, and more specifically, to a method, apparatus, and electronic equipment for designing rolling parameters for thin-gauge heavy plates. Background Technology

[0002] Thin-gauge wide and thick plates are widely used in key industries such as engineering machinery, shipbuilding, pressure vessels, and bridge construction due to their lightweight, high strength, and good processing performance. During the rolling process of thin-gauge wide and thick plates, the rolling process is often controlled by calculating core rolling parameters, thereby ensuring the production quality of the plates.

[0003] However, in practical applications, the temperature of thin-gauge wide and thick plates during rolling is easily affected by factors such as rolling speed and coiling time, often resulting in a significant deviation from the actual temperature. This leads to the calculated rolling parameters failing to meet actual requirements. Furthermore, existing hot roll mills rely heavily on empirical formulas for setting rolling parameters, lacking precise optimization models for thin-gauge wide and thick plates, resulting in poor accuracy of the rolling parameters. Summary of the Invention

[0004] The present invention aims to solve at least one of the above-mentioned problems.

[0005] To address the aforementioned problems, this invention provides a method, apparatus, and electronic equipment for designing rolling parameters for thin-gauge wide-thick plates.

[0006] In a first aspect, the present invention provides a method for designing rolling parameters for thin-gauge wide-thick plates, including: Based on Fourier's law, a temperature correction model is constructed according to the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The temperature correction model is discretized and solved using the finite difference method to obtain the actual rolling temperature of the strip. The flattening contact arc length, material deformation resistance, and stress state coefficient are obtained based on the actual rolling temperature of the strip. The rolling force parameters are obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient, wherein the rolling force parameters include unit rolling force and total rolling force.

[0007] Optionally, the step of constructing a temperature correction model based on the rolling process parameters of thin-gauge wide-thick plates includes: Obtain the rolling process parameters of the thin-gauge wide-thick plate; The temperature correction model is constructed based on the rolling process parameters of the thin-gauge wide-thick plate. The temperature correction model includes: , in, Here, c is the density of the strip, c is the specific heat capacity of the strip, T is the actual rolling temperature of the strip, and t is time. Let be the thermal conductivity of the strip, x, y, and z be the coordinates of the strip's length, width, and thickness, respectively, and q be the deformation heat generation rate.

[0008] Optionally, obtaining the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip includes: Obtain rolling mill parameters; The flattening contact arc length is obtained based on the parameters of the rolling equipment. The deformation resistance of the material is obtained by using the actual rolling temperature of the strip and the parameters of the rolling equipment. The stress state coefficient is obtained by using the material's deformation resistance and the rolling equipment parameters.

[0009] Optionally, the rolling equipment parameters include the equivalent radius after roll flattening and the reduction per rolling pass, and obtaining the flattening contact arc length based on the rolling equipment parameters includes: The flattening contact arc length is obtained based on the equivalent radius of the roll after flattening and the reduction amount of the rolling pass. Wherein, the flattened contact arc length includes: , Wherein, ld is the flattened contact arc length. The equivalent radius after the roll is flattened. The reduction amount per rolling pass. , For the thickness of the entrance of the passage, The thickness at the exit of each pass.

[0010] Optionally, the rolling equipment parameters further include reference temperature deformation resistance, temperature correction coefficient, reference temperature, true strain of deformation resistance, true strain rate of deformation resistance, strain hardening index, and strain rate sensitivity index. Obtaining the material deformation resistance through the actual rolling temperature of the strip and the rolling equipment parameters includes: The deformation resistance of the material is obtained by using the actual rolling temperature of the strip, the deformation resistance at the reference temperature, the temperature correction coefficient, the reference temperature, the true strain of the deformation resistance, the true strain rate of the deformation resistance, the strain hardening index, and the strain rate sensitivity index. The material deformation resistance includes: , in, K0 is the deformation resistance of the material, and K0 is the deformation resistance at the reference temperature. Here, T is the temperature correction factor, T0 is the reference temperature, and T is the actual rolling temperature of the strip. The true strain represents the deformation resistance. denoted as the true strain rate of the deformation resistance, m as the strain hardening exponent, and n as the strain rate sensitivity exponent.

[0011] Optionally, the rolling equipment parameters further include a stress state influence coefficient without tension and strip tension. The step of obtaining the stress state coefficient using the material deformation resistance and the rolling equipment parameters includes: The stress state coefficient is obtained by using the material deformation resistance, the stress state influence coefficient without tension, and the strip tension. The stress state coefficient includes: , in, The stress state coefficient is... The influence coefficient of the stress-free state is... The strip tension, The deformation resistance of the material.

[0012] Optionally, obtaining the rolling force energy parameters through the flattening contact arc length, the material deformation resistance, and the stress state coefficient includes: The unit rolling force is obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient. The unit rolling force includes: , Where P is the unit rolling force, This is the correction factor for the temperature compensation effect. Where B is the deformation resistance of the material, B is the width of the rolled piece, and ld is the flattening contact arc length. The stress state coefficient is mentioned above. The total rolling force is obtained based on the unit rolling force.

[0013] Secondly, the present invention provides a rolling parameter design device for thin-gauge wide and thick plates, comprising: a temperature correction model construction module, used to construct a temperature correction model based on Fourier's law and according to the rolling process parameters of thin-gauge wide and thick plates, wherein the temperature correction model is used to represent the change of strip temperature at different positions at different times; The actual strip rolling temperature acquisition module is used to discretize and solve the temperature correction model using the finite difference method to obtain the actual strip rolling temperature. The key parameter acquisition module is used to obtain the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip. The rolling force energy parameter acquisition module is used to obtain rolling force energy parameters through the flattening contact arc length, the material deformation resistance and the stress state coefficient, wherein the rolling force energy parameters include unit rolling force and total rolling force.

[0014] Thirdly, the present invention provides an electronic device, including a memory and a processor; The memory is used to store computer programs; The processor is configured to, when executing the computer program, implement the rolling parameter design method for thin-gauge wide-thick plates as described in the first aspect.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the rolling parameter design method for thin-gauge wide-thick plates as described in the first aspect.

[0016] The beneficial effects of the rolling parameter design method, apparatus, and electronic equipment for thin-gauge wide and thick plates of the present invention are as follows: Based on Fourier's law, a temperature correction model is constructed, which can realistically depict the transient temperature evolution of the strip at various times and locations, significantly improving temperature accuracy and providing reliable temperature conditions for subsequent parameter calculations. The temperature correction model is solved using the finite difference method, ensuring both solution accuracy and real-time performance, yielding the actual rolling temperature of the strip. Based on the actual rolling temperature of the strip, the flattening contact arc length, material deformation resistance, and stress state coefficient are obtained. Rolling force energy parameters are calculated based on these parameters, improving the accuracy of rolling force energy parameter calculations and obtaining unit rolling force and total rolling force that better meet actual needs. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a method for designing rolling parameters for thin-gauge wide and thick plates according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a rolling parameter design device for thin-gauge wide and thick plates according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "more" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] In related technologies, as downstream industries continue to increase their requirements for product precision, performance stability and production efficiency, the market demand for thin-gauge wide and thick plates continues to grow, while more stringent standards are being put forward for indicators such as thickness tolerance, plate shape quality and uniformity of mechanical properties.

[0024] The rolling of traditional thin-gauge wide and thick plates typically relies on conventional four-high plate mills. However, these mills have significant limitations: firstly, due to the low rigidity of thin plates during rolling, they are prone to shape defects such as wavy and cambered edges. Controlling the plate shape often requires multiple adjustments to rolling parameters, leading to an increase in rolling passes and low production efficiency. Secondly, the uneven distribution of rolling force in conventional mills easily causes plate thickness fluctuations exceeding allowable limits, especially when rolling wide thin plates, where edge thinning is more pronounced, making it difficult to meet high-precision production requirements. Furthermore, the heating-rolling process in conventional mills is not tightly integrated, resulting in rapid temperature drops during rolling. Additional heating is needed to maintain the rolling temperature, increasing energy consumption and potentially affecting the plate's microstructure and mechanical properties, further limiting the production quality and cost control of thin-gauge wide and thick plates.

[0025] Conventional heavy plate rolling mills typically face significant temperature drops and compromised product quality when rolling thin-gauge steel plates. Furthermore, limited by the final rolling temperature, they struggle to roll finished steel plates thinner than 6mm. Hot coil mills, with their pre- and post-coiling furnaces, provide supplemental heating to the steel plate during the rolling process (usually, intermediate billets rolled to below 25mm can be placed in the coiling furnace for supplemental heating), effectively reducing temperature drop and enabling the rolling of thin-gauge heavy plates up to 6mm thick. As a continuous rolling mill integrating heating, rolling, and coiling, hot coil mills offer advantages such as a short rolling process, precise temperature control, and flexible rolling force adjustment, theoretically capable of meeting the rolling requirements of thin-gauge heavy plates. However, in practical applications, hot-rolled coil mills still face many technical challenges in rolling thin-gauge wide and thick plates: First, the coordinated control of coiling and rolling in hot-rolled coil mills is difficult, and uneven coiling tension is prone to occur during the coiling process of thin-gauge plates, leading to plate shape deviations during subsequent rolling; Second, the temperature field distribution of the plate during rolling is easily affected by factors such as rolling speed and coiling time. If the temperature is not properly controlled, it will lead to differences in deformation resistance in different areas of the plate, which in turn will cause uneven thickness and performance fluctuations; Third, the rolling parameter settings of existing hot-rolled coil mills mostly rely on empirical formulas and lack precise optimization models for thin-gauge wide and thick plates. It is difficult to dynamically adjust key parameters such as rolling force, rolling speed, and coiling tension according to different steel grades and specifications of plates, resulting in poor production stability and low product qualification rate.

[0026] To address the problems existing in the aforementioned related technologies, this embodiment provides a method, apparatus, and electronic equipment for designing rolling parameters for thin-gauge wide and thick plates.

[0027] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for designing rolling parameters for thin-gauge wide-thick plates, including: Step 110: Based on Fourier's law, a temperature correction model is constructed according to the rolling process parameters of thin-gauge wide-thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times.

[0028] Specifically, the temperature field of strip steel in a hot-rolled mill exhibits unsteady-state characteristics, influenced by multiple factors such as rolling deformation heat, roll heat exchange, air cooling, and reheating in the coiling furnace. Temperature changes directly determine the strip steel's deformation resistance and rolling quality. A temperature correction model is constructed based on Fourier's law, focusing on the temperature compensation effect during the reheating process in the coiling furnace, to achieve accurate prediction of the temperature throughout the entire rolling process.

[0029] Step 120: Discretize and solve the temperature correction model using the finite difference method to obtain the actual rolling temperature of the strip.

[0030] Specifically, the finite difference method is used to discretize and solve the temperature field control equations, discretizing the temperature correction model in both space and time. The finite difference method is a numerical method for solving differential equations, using difference quotients to approximate derivatives, thus transforming continuous differential equations into a discrete system of algebraic equations, which can then be solved by computer. The strip is divided into 10 equidistant node layers along its thickness to capture the temperature gradient along the thickness direction; it is also segmented along its length according to rolling passes to reflect the differences in heat exchange conditions at different locations; a time step of 0.1 s is used, and the strip temperature values ​​at each time point and location are obtained through iterative calculation.

[0031] Step 130: Obtain the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip.

[0032] Specifically, the flattening contact arc length refers to the projected length of the actual contact area along the rolling direction after the roll and strip are elastically flattened under rolling force. Material deformation resistance refers to the ability of a metal to resist plastic deformation under specific temperature, strain, and strain rate conditions. Temperature is the most significant factor affecting deformation resistance and has a strong negative correlation with it. The stress state coefficient is a coefficient used to represent the calculation of material strength under different stress states.

[0033] Step 140: The rolling force energy parameters are obtained by means of the flattening contact arc length, the material deformation resistance and the stress state coefficient, wherein the rolling force energy parameters include the unit rolling force and the total rolling force.

[0034] Specifically, after obtaining the rolling force and energy parameters through the key parameters of the rolling process, the method further includes: The actual required equipment parameters are obtained based on the rolling force parameters, wherein the actual required equipment parameters include the rolling mill roll system, motor power, and rated rolling force.

[0035] In some more specific embodiments, a calculation model for a hot-rolled coil mill is developed based on the calculation model for a heavy plate mill. This facilitates accurate calculation of the temperature changes of the steel plate after the coiling furnace participates in the rolling process (in the hot rolling stage, the temperature change of the steel plate has a significant impact on the rolling force). This allows for the calculation of the rolling force parameters required for the steel plate rolling process, which in turn enables the design of equipment parameters (mill roll system, motor power, rated rolling force, etc., which directly determine the configuration of the entire production line and serve as the basis for its positioning) that better meet actual needs. This reduces equipment redundancy and saves on initial investment.

[0036] In this embodiment, a temperature correction model is constructed based on Fourier's law, which can accurately depict the transient temperature evolution of the strip at various times and locations, significantly improving the accuracy of the temperature measurement and providing reliable temperature conditions for subsequent parameter calculations. The temperature correction model is solved using the finite difference method, ensuring both accuracy and real-time performance, to obtain the actual rolling temperature of the strip. Based on the actual rolling temperature, the flattening contact arc length, material deformation resistance, and stress state coefficient are obtained. These parameters are then used to calculate the rolling force energy parameters, improving the accuracy of the calculation and yielding unit rolling force and total rolling force that better reflect actual needs.

[0037] Optionally, the step of constructing a temperature correction model based on the rolling process parameters of thin-gauge wide-thick plates includes: Obtain the rolling process parameters of the thin-gauge wide-thick plate; The temperature correction model is constructed based on the rolling process parameters of the thin-gauge wide-thick plate. The temperature correction model includes: , in, Here, c is the density of the strip, c is the specific heat capacity of the strip, T is the actual rolling temperature of the strip, and t is time. Let be the thermal conductivity of the strip, x, y, and z be the coordinates of the strip's length, width, and thickness, respectively, and q be the deformation heat generation rate.

[0038] Specifically, the temperature field variation of the strip steel follows an unsteady-state heat conduction equation, and a temperature correction model is obtained by considering the internal heat source (deformation heat generation rate). Among these, The density of strip steel (kg / ), take 7850kg / c represents the specific heat capacity of the strip (J / ( At 900℃, take 650J / ( ); Thermal conductivity of strip steel (W / ( At 900℃, take 32W / ( ); t represents time (s); x, y, and z are the coordinates (m) of the strip length, width, and thickness, respectively; q is the heat generation rate of deformation, the heat generation rate of plastic deformation per unit volume (W / The deformation heat generation rate includes: , in, The deformation heat conversion efficiency is taken as 0.9. The deformation resistance of the material. To represent the true strain of deformation resistance, This represents the actual strain rate of the deformation resistance.

[0039] Boundary condition processing is performed to accurately describe the heat exchange behavior between the strip and the external environment, thus providing physically reasonable constraints for the temperature field control equations and ensuring that the numerical simulation results can realistically reflect the temperature evolution during the actual rolling process. For heat exchange in the rolling zone, a convective heat transfer model is used in the contact area between the strip and the rolls, with a heat transfer coefficient... Determined through empirical formulas: , Where v is the rolling speed, m / s, and the strip-air contact area adopts a combined radiation and convection heat transfer model, with the comprehensive heat transfer coefficient including: , The convective heat transfer coefficient includes: , The radiative heat transfer coefficient includes: , in, To consider the overall heat transfer coefficient, The convective heat transfer coefficient is... The radiative heat transfer coefficient is... Let be the Stefan-Boltzmann constant, and take... , The surface emissivity of the strip is taken as 0.85, and T0 is the ambient temperature, taken as 25°C. Boundary conditions quantify these complex physical processes mathematically and embed them into the model, giving the solutions to the governing equations engineering significance.

[0040] During the reheating process in the coiling furnace, the heat exchange of the strip inside the furnace is mainly radiative heat transfer. A constant temperature boundary condition is adopted, meaning the surface temperature of the strip inside the furnace is maintained at the furnace temperature. During the reheating period, the internal temperature of the strip is homogenized through heat conduction, and its temperature change satisfies: , in, Let T_in be the temperature of the strip at any position (x, y, z) and time t, and T_in be the initial temperature of the strip when it enters the coiling furnace. ), where erf is the error function. Where is the density of the strip, and c is the specific heat capacity of the strip.

[0041] In this optional embodiment, a complete temperature correction model is established, and the heat of plastic deformation is introduced as an internal heat source. The model can realistically reflect the local temperature rise phenomenon caused by high-speed deformation during the rolling process, and significantly improve the realism of the temperature field simulation.

[0042] Optionally, obtaining the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip includes: Obtain rolling mill parameters; The flattening contact arc length is obtained based on the parameters of the rolling equipment. The deformation resistance of the material is obtained by using the actual rolling temperature of the strip and the parameters of the rolling equipment. The stress state coefficient is obtained by using the material's deformation resistance and the rolling equipment parameters.

[0043] Optionally, the rolling equipment parameters include the equivalent radius after roll flattening and the reduction per rolling pass, and obtaining the flattening contact arc length based on the rolling equipment parameters includes: The flattening contact arc length is obtained based on the equivalent radius of the roll after flattening and the reduction amount of the rolling pass. Wherein, the flattened contact arc length includes: , Wherein, ld is the flattened contact arc length. The equivalent radius after the roll is flattened. The reduction amount per rolling pass. , For the thickness of the entrance of the passage, The thickness at the exit of each pass.

[0044] Specifically, considering the influence of the elastic deformation of the roll on the contact arc length, a modified formula is used to calculate the flattened contact arc length. The equivalent radius (mm) of the roll after it has been flattened. The reduction amount (mm) for the rolling pass. , For the thickness of the entrance of the passage, The exit thickness of the pass is the equivalent radius after the rolls are flattened. Calculated using Hertzian contact theory.

[0045] In this optional embodiment, the flattening contact arc length is accurately calculated based on the equivalent radius after roll flattening and the reduction amount per rolling pass, thus constructing a rolling geometry model that more closely reflects the actual physical contact state. Compared to the traditional simplified model that ignores the elastic deformation of the roll, this method has significant advantages in engineering accuracy and process control.

[0046] Optionally, the rolling equipment parameters further include reference temperature deformation resistance, temperature correction coefficient, reference temperature, true strain of deformation resistance, true strain rate of deformation resistance, strain hardening index, and strain rate sensitivity index. Obtaining the material deformation resistance through the actual rolling temperature of the strip and the rolling equipment parameters includes: The deformation resistance of the material is obtained by using the actual rolling temperature of the strip, the deformation resistance at the reference temperature, the temperature correction coefficient, the reference temperature, the true strain of the deformation resistance, the true strain rate of the deformation resistance, the strain hardening index, and the strain rate sensitivity index. The material deformation resistance includes: , in, K0 is the deformation resistance of the material, and K0 is the deformation resistance at the reference temperature. Here, T is the temperature correction factor, T0 is the reference temperature, and T is the actual rolling temperature of the strip. The true strain represents the deformation resistance. denoted as the true strain rate of the deformation resistance, m as the strain hardening exponent, and n as the strain rate sensitivity exponent.

[0047] Specifically, the deformation resistance of strip steel is affected by the combined effects of temperature, strain, and strain rate. Considering the temperature fluctuation characteristics of hot rolling mills, a temperature correction term is introduced to calculate the material's deformation resistance. K0 represents the deformation resistance (MPa) at the reference temperature T0, determined through laboratory tensile testing. This is a temperature correction factor, determined based on the characteristics of the steel grade; for Q355B steel, it is 0.003. T represents the actual rolling temperature of the strip ( ); To represent the true strain of deformation resistance, =ln(hin / hout); The true strain rate of deformation resistance ( m is the strain hardening index, and n is the strain rate sensitivity index. m and n are determined through thermal simulation experiments. For Q355B steel at 900... When m=0.15 and n=0.08.

[0048] In this optional embodiment, a high-precision, strongly physically coupled material deformation resistance calculation model is constructed by integrating the actual rolling temperature of the strip steel with multi-dimensional material constitutive parameters. This overcomes the limitations of traditional empirical formulas or simplifying assumptions and significantly improves the ability to obtain actual temperatures.

[0049] Optionally, the rolling equipment parameters further include a stress state influence coefficient without tension and strip tension. The step of obtaining the stress state coefficient using the material deformation resistance and the rolling equipment parameters includes: The stress state coefficient is obtained by using the material deformation resistance, the stress state influence coefficient without tension, and the strip tension. The stress state coefficient includes: , in, The stress state coefficient is... The influence coefficient of the stress-free state is... The strip tension, The deformation resistance of the material.

[0050] Specifically, considering the influence of the hot-rolled coil mill tension on the rolling force, a tension correction term is introduced. Optimize. The influence coefficient of the stress-free state is obtained from the chart based on the rolling ratio. The strip tension (MPa) is the value of the strip. Optionally, obtaining the rolling force energy parameters through the flattening contact arc length, the material deformation resistance, and the stress state coefficient includes: The unit rolling force is obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient. The unit rolling force includes: , Where P is the unit rolling force, This is the correction factor for the temperature compensation effect. Where B is the deformation resistance of the material, B is the width of the rolled piece, and ld is the flattening contact arc length. The stress state coefficient is mentioned above. The total rolling force is obtained based on the unit rolling force.

[0051] Specifically, considering the improved temperature uniformity of strip steel after reheating in the coiling furnace, a reheating effect correction coefficient is introduced. (Value range 1.0-1.05) After the strip steel is reheated in the coiling furnace, We set it to 1.03 to correct the effect of improved temperature uniformity on deformation resistance.

[0052] In some more specific embodiments, Olowan derived the well-known Olowan equilibrium differential equation for the rolling deformation zone based on the Nadai formula for the compression of rough inclined metal wedges. Sims derived this equation from Olowan's differential equation and it is currently widely used in calculating rolling force during hot rolling of strip and plate. Sims's formula for unit rolling force includes: , Total rolling force includes: , in, Let F be the unit rolling force of Sims, and F be the total rolling force. The heritability coefficient of the rolling force equipment. Here, B represents the material-related genetic coefficient of rolling force, and B represents the width of the rolled piece (steel plate). The unit rolling force P, calculated after temperature compensation, is used to replace the Sims unit rolling force. Substituting these values ​​into the total rolling force formula yields the total rolling force. Given parameters such as roll radius, inlet thickness, outlet thickness, workpiece width, strain, and material deformation resistance, the rolling force under corresponding operating conditions can be calculated using the formula. This verifies the main rolling mill's energy parameters, confirms compliance with these parameters, and enables the development of various production lines specifically designed for thick plate hot rolling mills. Ultimately, this provides a theoretical calculation basis for the specialization and targeted nature of hot rolling equipment.

[0053] In this optional embodiment, by integrating the flattening contact arc length, material deformation resistance, and stress state coefficient, and introducing a temperature compensation effect correction coefficient, a unit rolling force calculation model suitable for rolling thin-gauge wide and thick plates is constructed. This accurately derives the total rolling force, significantly improving the accuracy of rolling force prediction and process adaptability.

[0054] like Figure 2 As shown in the figure, an embodiment of the present invention provides a rolling parameter design device for thin-gauge wide-thickness plates, comprising: Temperature correction model construction module 10 is used to construct a temperature correction model based on Fourier's law and the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The actual strip rolling temperature acquisition module 20 is used to discretize and solve the temperature correction model using the finite difference method to obtain the actual strip rolling temperature. Key parameter acquisition module 30 is used to obtain the flattening contact arc length, material deformation resistance and stress state coefficient based on the actual rolling temperature of the strip. The rolling force energy parameter acquisition module 40 is used to obtain rolling force energy parameters through the flattening contact arc length, the material deformation resistance and the stress state coefficient, wherein the rolling force energy parameters include unit rolling force and total rolling force.

[0055] The rolling parameter design device for thin-gauge wide and thick plates in this embodiment is used to implement the rolling parameter design method for thin-gauge wide and thick plates as described above. Its advantages over the prior art are the same as the advantages of the rolling parameter design method for thin-gauge wide and thick plates over the prior art, and will not be repeated here.

[0056] Optionally, the temperature correction model construction module 10 is specifically used to: obtain the rolling process parameters of the thin-gauge wide-thick plate; The temperature correction model is constructed based on the rolling process parameters of the thin-gauge wide-thick plate. The temperature correction model includes: , in, Here, c is the density of the strip, c is the specific heat capacity of the strip, T is the actual rolling temperature of the strip, and t is time. Let be the thermal conductivity of the strip, x, y, and z be the coordinates of the strip's length, width, and thickness, respectively, and q be the deformation heat generation rate.

[0057] Optionally, the key parameter acquisition module 30 is specifically used to: acquire rolling equipment parameters; The flattening contact arc length is obtained based on the parameters of the rolling equipment. The deformation resistance of the material is obtained by using the actual rolling temperature of the strip and the parameters of the rolling equipment. The stress state coefficient is obtained by using the material's deformation resistance and the rolling equipment parameters.

[0058] Optionally, the key parameter acquisition module 30 is specifically used to: obtain the flattening contact arc length based on the equivalent radius of the roll after flattening and the reduction amount of the rolling pass; Wherein, the flattened contact arc length includes: , Wherein, ld is the flattened contact arc length. The equivalent radius after the roll is flattened. The reduction amount per rolling pass. , For the thickness of the entrance of the passage, The thickness at the exit of each pass.

[0059] Optionally, the key parameter acquisition module 30 is specifically used to: obtain the material deformation resistance through the actual rolling temperature of the strip, the deformation resistance at the reference temperature, the temperature correction coefficient, the reference temperature, the true strain of the deformation resistance, the true strain rate of the deformation resistance, the strain hardening index, and the strain rate sensitivity index; The material deformation resistance includes: , in, K0 is the deformation resistance of the material, and K0 is the deformation resistance at the reference temperature. Here, T is the temperature correction factor, T0 is the reference temperature, and T is the actual rolling temperature of the strip. The true strain represents the deformation resistance. denoted as the true strain rate of the deformation resistance, m as the strain hardening exponent, and n as the strain rate sensitivity exponent.

[0060] Optionally, the key parameter acquisition module 30 is specifically used to: obtain the stress state coefficient through the material deformation resistance, the stress state influence coefficient without tension, and the strip tension; The stress state coefficient includes: , in, The stress state coefficient is... The influence coefficient of the stress-free state is... The strip tension, The deformation resistance of the material.

[0061] Optionally, the rolling force parameter acquisition module 40 is specifically used to: obtain the unit rolling force through the flattening contact arc length, the material deformation resistance, and the stress state coefficient; The unit rolling force includes: , Where P is the unit rolling force, This is the correction factor for the temperature compensation effect. Where B is the deformation resistance of the material, B is the width of the rolled piece, and ld is the flattening contact arc length. The stress state coefficient is mentioned above. The total rolling force is obtained based on the unit rolling force.

[0062] like Figure 3 As shown, an electronic device 300 provided in this embodiment of the invention includes a memory 310 and a processor 320; the memory 310 is used to store a computer program; the processor 320 is used to implement the rolling parameter design method for thin-gauge wide-thick plates as described above when the computer program is executed.

[0063] Alternatively, an electronic device 300 includes a memory 310 and a processor 320 coupled to the memory 310; the memory 310 is configured to store a computer program; and the processor 320 is configured to perform the following operations when the computer program is executed: Based on Fourier's law, a temperature correction model is constructed according to the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The temperature correction model is discretized and solved using the finite difference method to obtain the actual rolling temperature of the strip. The flattening contact arc length, material deformation resistance, and stress state coefficient are obtained based on the actual rolling temperature of the strip. The rolling force parameters are obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient, wherein the rolling force parameters include unit rolling force and total rolling force.

[0064] This invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the rolling parameter design method for thin-gauge wide-thick plates as described above.

[0065] Alternatively, a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the following operations: Based on Fourier's law, a temperature correction model is constructed according to the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The temperature correction model is discretized and solved using the finite difference method to obtain the actual rolling temperature of the strip. The flattening contact arc length, material deformation resistance, and stress state coefficient are obtained based on the actual rolling temperature of the strip. The rolling force parameters are obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient, wherein the rolling force parameters include unit rolling force and total rolling force.

[0066] The present invention will now be described an electronic device 300 that can serve as a server or client of the present invention, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic device 300 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 300 can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0067] Electronic device 300 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) or a computer program loaded from a storage unit into random access memory (RAM). The RAM may also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0068] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention according to actual needs. Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or as software functional units.

[0069] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for designing rolling parameters for thin-gauge wide-thick plates, characterized in that, include: Based on Fourier's law, a temperature correction model is constructed according to the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The temperature correction model is discretized and solved using the finite difference method to obtain the actual rolling temperature of the strip. The flattening contact arc length, material deformation resistance, and stress state coefficient are obtained based on the actual rolling temperature of the strip. The rolling force parameters are obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient, wherein the rolling force parameters include unit rolling force and total rolling force.

2. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 1, characterized in that, The construction of the temperature correction model based on the rolling process parameters of thin-gauge wide-thick plates includes: Obtain the rolling process parameters of the thin-gauge wide-thick plate; The temperature correction model is constructed based on the rolling process parameters of the thin-gauge wide-thick plate. The temperature correction model includes: ， in, Here, c is the density of the strip, c is the specific heat capacity of the strip, T is the actual rolling temperature of the strip, and t is time. Let be the thermal conductivity of the strip, x, y, and z be the coordinates of the strip's length, width, and thickness, respectively, and q be the deformation heat generation rate.

3. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 1, characterized in that, The process of obtaining the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip includes: Obtain rolling mill parameters; The flattening contact arc length is obtained based on the parameters of the rolling equipment. The deformation resistance of the material is obtained by using the actual rolling temperature of the strip and the parameters of the rolling equipment. The stress state coefficient is obtained by using the material's deformation resistance and the rolling equipment parameters.

4. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 3, characterized in that, The rolling equipment parameters include the equivalent radius after roll flattening and the reduction per rolling pass. Obtaining the flattening contact arc length based on the rolling equipment parameters includes: The flattening contact arc length is obtained based on the equivalent radius of the roll after flattening and the reduction amount of the rolling pass. Wherein, the flattened contact arc length includes: ， Wherein, ld is the flattened contact arc length. The equivalent radius after the roll is flattened. The reduction amount per rolling pass. , For the thickness of the entrance passage, The thickness at the exit of each pass.

5. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 4, characterized in that, The rolling equipment parameters also include reference temperature deformation resistance, temperature correction coefficient, reference temperature, true strain of deformation resistance, true strain rate of deformation resistance, strain hardening index, and strain rate sensitivity index. The deformation resistance of the material is obtained through the actual rolling temperature of the strip and the rolling equipment parameters, including: The deformation resistance of the material is obtained by using the actual rolling temperature of the strip, the deformation resistance at the reference temperature, the temperature correction coefficient, the reference temperature, the true strain of the deformation resistance, the true strain rate of the deformation resistance, the strain hardening index, and the strain rate sensitivity index. The material deformation resistance includes: ， in, K0 is the deformation resistance of the material, and K0 is the deformation resistance at the reference temperature. Here, T is the temperature correction factor, T0 is the reference temperature, and T is the actual rolling temperature of the strip. The true strain represents the deformation resistance. denoted as the true strain rate of the deformation resistance, m as the strain hardening exponent, and n as the strain rate sensitivity exponent.

6. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 5, characterized in that, The rolling equipment parameters also include the stress state influence coefficient without tension and the strip tension. The stress state coefficient, obtained through the material deformation resistance and the rolling equipment parameters, includes: The stress state coefficient is obtained by using the material deformation resistance, the stress state influence coefficient without tension, and the strip tension. The stress state coefficient includes: ， in, The stress state coefficient is... The influence coefficient of the stress-free state is... The strip tension, The deformation resistance of the material is given.

7. The method for designing rolling parameters for thin-gauge wide and thick plates according to claim 1, characterized in that, The method of obtaining rolling force energy parameters through the flattening contact arc length, the material deformation resistance, and the stress state coefficient includes: The unit rolling force is obtained by the flattening contact arc length, the material deformation resistance, and the stress state coefficient. The unit rolling force includes: ， Where P is the unit rolling force, This is the correction factor for the temperature compensation effect. Where B is the deformation resistance of the material, B is the width of the rolled piece, and ld is the flattening contact arc length. The stress state coefficient is mentioned above. The total rolling force is obtained based on the unit rolling force.

8. A rolling parameter design device for thin-gauge wide-thickness plates, characterized in that, include: The temperature correction model construction module is used to construct a temperature correction model based on Fourier's law and the rolling process parameters of thin-gauge wide and thick plates. The temperature correction model is used to represent the change of strip temperature at different locations at different times. The actual strip rolling temperature acquisition module is used to discretize and solve the temperature correction model using the finite difference method to obtain the actual strip rolling temperature. The key parameter acquisition module is used to obtain the flattening contact arc length, material deformation resistance, and stress state coefficient based on the actual rolling temperature of the strip. The rolling force energy parameter acquisition module is used to obtain rolling force energy parameters through the flattening contact arc length, the material deformation resistance and the stress state coefficient, wherein the rolling force energy parameters include unit rolling force and total rolling force.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to, when executing the computer program, implement the rolling parameter design method for thin-gauge wide-thick plates as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the rolling parameter design method for thin-gauge wide-thick plates as described in any one of claims 1 to 7.

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