Rolling methods, apparatus, media, and equipment for optimizing the planar shape of steel plates

Abstract

This application discloses a rolling method, apparatus, medium, and equipment for optimizing the planar shape of steel plates. The method includes: before longitudinal and transverse rolling of the slab, performing a preset number of longitudinal and transverse rolling operations on the slab based on planar shape control parameters for longitudinal and transverse rolling, to adjust the width ratio and elongation ratio of the slab before entering the longitudinal and transverse rolling stage; wherein the preset number of operations is determined based on the original width ratio and original elongation ratio of the slab, as well as the initial width ratio and initial elongation ratio of the slab when entering the longitudinal and transverse rolling stage; the planar shape control parameters for longitudinal and transverse rolling are determined based on the deformation amount of the rolled piece obtained after each longitudinal and transverse rolling operation, and the original width ratio is greater than or equal to 1.8. The method of this application allows the new target width ratio and elongation ratio obtained before the longitudinal and transverse rolling strategy to be within a reasonable range, effectively controlling the planar shape and improving the rectangularity of the final finished steel plate.

Description

Technical Field

[0001] This application relates to the field of metal rolling technology, and in particular to a rolling method, apparatus, medium and equipment for optimizing the planar shape of steel plates. Background Technology

[0002] In the field of metal pressure processing, medium and heavy plate rolling is the process of rolling thick slabs into steel plates of target dimensions. During the rolling process, when using thick slabs to produce steel plates with a large width ratio, the mismatch between the width ratio and elongation ratio can affect the planar shape of the final steel plate. This results in excessive width deviations at the beginning, end, and middle of the finished steel plate, leading to increased trimming and severely impacting the yield.

[0003] In existing technologies, two main strategies are employed: transverse-longitudinal rolling and longitudinal-transverse-longitudinal rolling. Compared to transverse-longitudinal rolling, longitudinal-transverse-longitudinal rolling optimizes the billet state and metal flow conditions through longitudinal rolling, resulting in a more reasonable match between width expansion and elongation. This reduces width deviation and can more effectively improve the rectangularity of steel plates and enhance shape accuracy.

[0004] However, as slab dimensions expand, thickness also increases, pushing the limits of traditional experience in terms of width and elongation. Simultaneously, limited by mill capacity, traditional planar shape control reaches its upper limit, unable to further improve rectangularity, thus preventing further reduction in cutting losses. Summary of the Invention

[0005] In view of this, this application provides a rolling method, apparatus, medium and equipment for optimizing the planar shape of steel plates. By adding a preset number of longitudinal and transverse rolling operations before longitudinal and transverse rolling, the width ratio and elongation ratio are adjusted to a reasonable range, thereby effectively controlling the planar shape, improving the rectangularity of the final finished steel plate and increasing the yield.

[0006] According to a first aspect of this application, a rolling method for optimizing the planar shape of a steel plate is provided, the method comprising: Based on the original dimensions of the slab and the target dimensions of the finished product, the original width ratio of the slab is calculated; Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, the initial width ratio when the slab enters the longitudinal and transverse rolling stages is determined; Based on the ratio between the original width ratio and the initial width ratio, a preset number of longitudinal and transverse rolling operations is determined; Before the slab is subjected to longitudinal and transverse rolling, the slab is subjected to longitudinal and transverse rolling for the preset number of times based on the planar shape control parameters of longitudinal and transverse rolling, so as to adjust the width ratio and elongation ratio of the slab before entering the longitudinal and transverse rolling stage. The planar shape control parameters of the longitudinal and transverse rolling are determined based on the deformation of the rolled piece after each longitudinal and transverse rolling, and the original width ratio is greater than or equal to 1.8.

[0007] Optionally, the rolling method for optimizing the planar shape of the steel plate further includes: Based on the original dimensions of the slab and the target dimensions of the finished product, calculate the original elongation ratio of the slab; Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, the initial elongation ratio of the slab when it enters the longitudinal and transverse rolling stages is determined.

[0008] Optionally, determining the preset number of times based on the ratio between the original width ratio and the initial width ratio includes: Calculate the change between the original aspect ratio and the initial aspect ratio; Calculate the ratio of the change to the preset broadening optimization coefficient and round up to the nearest positive integer to obtain the preset number of times.

[0009] Optionally, the rolling method for optimizing the planar shape of the steel plate further includes: Based on the stage dimensions of the workpiece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stage, and the preset number of times, the stage dimensions of the workpiece obtained after the i-th longitudinal and transverse rolling are calculated respectively; based on the stage dimensions of the workpiece obtained after the i-th longitudinal and transverse rolling, the initial dimensions, and the preset number of times, the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling are determined; based on the stage dimensions, the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stage are determined respectively.

[0010] Optionally, the stage dimensions or the original dimensions of the slab or the target dimensions of the finished product include thickness, width, and length; the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling are calculated based on the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling, the initial dimensions of the slab when entering the longitudinal and transverse rolling stage, and the preset number of times, using the following calculation formula: ; ; ; In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The thickness of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The width of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The length of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The initial width of the slab before entering the longitudinal and transverse rolling stages; The initial length of the slab before entering the longitudinal and transverse rolling stages; This is the preset number of times.

[0011] Optionally, the rolling method for optimizing the planar shape of the steel plate further includes: Based on the original dimensions of the slab and its initial dimensions when entering the longitudinal and transverse rolling stages, the original dimensions are evenly distributed to each longitudinal and transverse rolling stage to determine the stage width ratio and stage elongation ratio for each longitudinal and transverse rolling stage. Based on the initial dimensions, the stage width ratio, and the stage elongation ratio, the stage dimensions for each longitudinal and transverse rolling stage are calculated. Based on the stage dimensions, planar shape control parameters that conform to the stage width ratio and stage elongation ratio for the corresponding longitudinal and transverse rolling stages are determined respectively.

[0012] Optionally, the longitudinal and transverse rolling includes a forming stage and a widening stage.

[0013] Optionally, the planar shape control parameters include the steady-state length of the platform segment, the unsteady-state horizontal length, and the planar shape control height.

[0014] Optionally, the planar shape control parameters for determining the stage width ratio and stage elongation ratio corresponding to the respective longitudinal and transverse rolling stages based on the stage dimensions are calculated using the following formula: ; ; ; ; In the formula, is the unsteady horizontal length during the forming stage of the i-th longitudinal and transverse rolling process; The unsteady horizontal length during the widening stage in the i-th longitudinal and transverse rolling process; The height is the planar shape control height during the forming stage of the i-th longitudinal and transverse rolling process. The height is used to control the planar shape during the widening stage of the i-th longitudinal and transverse rolling process. Horizontal velocity; Vertical velocity; The stage width ratio for the i-th longitudinal and transverse rolling process; is the stage elongation ratio of the i-th longitudinal and transverse rolling.

[0015] According to a second aspect of this application, a rolling apparatus for optimizing the planar shape of steel plates is provided, the apparatus comprising: The simulation calculation module is used to calculate the original width ratio of the slab based on the original size of the slab and the target size of the finished product; and to determine the initial width ratio of the slab when it enters the longitudinal and transverse rolling stage based on the target size of the finished product and the control parameters of the longitudinal and transverse rolling stage; and to determine the preset number of longitudinal and transverse rolling operations based on the ratio between the original width ratio and the initial width ratio. The control module is used to perform longitudinal and transverse rolling on the slab a preset number of times based on the planar shape control parameters of longitudinal and transverse rolling before the slab enters the longitudinal and transverse rolling stage, so as to adjust the width ratio and elongation ratio of the slab before it enters the longitudinal and transverse rolling stage. The planar shape control parameters of the longitudinal and transverse rolling are determined based on the deformation of the rolled piece after each longitudinal and transverse rolling, and the original width ratio is greater than or equal to 1.8.

[0016] Optionally, the simulation calculation module is also used to calculate the original elongation ratio of the slab based on the original size of the slab and the target size of the finished product; and to determine the initial elongation ratio of the slab when it enters the longitudinal and transverse rolling stages based on the target size of the finished product and the control parameters of the longitudinal and transverse rolling stages.

[0017] Optionally, the simulation calculation module is specifically used to calculate the change between the original width ratio and the initial width ratio; calculate the ratio of the change to the preset width optimization coefficient and round it up to the positive integer to obtain the preset number of times.

[0018] Optionally, the control module is further configured to calculate the stage dimensions of the rolled piece after the i-th longitudinal and transverse rolling based on the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stage, and the preset number of times; determine the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling based on the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling, the initial dimensions, and the preset number of times; and determine the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stage based on the stage dimensions.

[0019] Optionally, the stage dimensions or the original dimensions of the slab or the target dimensions of the finished product include thickness, width, and length; the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling are calculated based on the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling, the initial dimensions of the slab when entering the longitudinal and transverse rolling stage, and the preset number of times, using the following calculation formula: ; ; ; In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The thickness of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The width of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The length of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The initial width of the slab before entering the longitudinal and transverse rolling stages; The initial length of the slab before entering the longitudinal and transverse rolling stages; This is the preset number of times.

[0020] Optionally, the control module is further configured to: distribute the original dimensions of the slab evenly to each longitudinal and transverse rolling stage based on the original dimensions of the slab and the initial dimensions of the slab when it enters the longitudinal and transverse rolling stages; determine the stage width ratio and stage extension ratio for each longitudinal and transverse rolling stage; calculate the stage dimensions for each longitudinal and transverse rolling stage based on the initial dimensions, the stage width ratio, and the stage extension ratio; and determine the planar shape control parameters that conform to the stage width ratio and stage extension ratio of the corresponding longitudinal and transverse rolling stages based on the stage dimensions.

[0021] Optionally, the longitudinal and transverse rolling includes a forming stage and a widening stage.

[0022] Optionally, the planar shape control parameters include the steady-state length of the platform segment, the unsteady-state horizontal length, and the planar shape control height.

[0023] Optionally, the planar shape control parameters for determining the stage width ratio and stage elongation ratio corresponding to the respective longitudinal and transverse rolling stages based on the stage dimensions are calculated using the following formula: ; ; ; ; In the formula, is the unsteady horizontal length during the forming stage of the i-th longitudinal and transverse rolling process; The unsteady horizontal length during the widening stage in the i-th longitudinal and transverse rolling process; The height is the planar shape control height during the forming stage of the i-th longitudinal and transverse rolling process. The height is used to control the planar shape during the widening stage of the i-th longitudinal and transverse rolling process. Horizontal velocity; Vertical velocity; The stage width ratio for the i-th longitudinal and transverse rolling process; is the stage elongation ratio of the i-th longitudinal and transverse rolling.

[0024] According to a third aspect of this application, a readable storage medium is provided having a program or instructions stored thereon, which, when executed by a processor, implement the steps of the rolling method for optimizing the planar shape of the steel plate described above.

[0025] According to a fourth aspect of this application, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described rolling method for optimizing the planar shape of a steel plate.

[0026] By employing the aforementioned technical solution, for slabs requiring a large width ratio, one or more longitudinal and transverse rolling stages are added before the longitudinal-transverse rolling strategy. These additional stages continuously adjust and change the slab's width and elongation ratios, ensuring that the final width and elongation ratios obtained before the longitudinal-transverse rolling strategy are within a reasonable range. This solves the planar shape control problem caused by improper matching of width and elongation ratios in the production of large-width steel plates, significantly improving the rectangularity of the finished steel plates, reducing cutting losses, and increasing yield. Simultaneously, by precisely calculating the rolled piece dimensions and planar shape control parameters for each stage, refined control of the rolling process is achieved, improving product quality and production efficiency.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic flowchart of a rolling method for optimizing the planar shape of steel plates provided in an embodiment of this application is shown. Figure 2 This illustration shows a rolling control diagram of the rolling method for optimizing the planar shape of steel plates provided in an embodiment of this application; Figure 3 This illustration shows a schematic cross-sectional view of the planar shape control during the forming stage provided in an embodiment of this application. Figure 4 This illustration shows a schematic cross-sectional view of the planar shape control during the stretching stage provided in an embodiment of this application. Figure 5 A structural block diagram of a rolling apparatus for optimizing the planar shape of steel plates provided in an embodiment of this application is shown; Figure 6 A schematic diagram of the electronic structure of a computer device provided in an embodiment of this application is shown. Detailed Implementation

[0029] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “attached” to another element, it can be directly connected or attached to the other element, or there may be intermediate elements present. Furthermore, the term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0032] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0033] In existing technologies, longitudinal rolling is typically used directly, which involves performing one or more longitudinal rolling passes first, followed by longitudinal rolling after widening. However, when the slab size is large or the target dimensions of the finished product are special, it may cause excessive protrusion of the edge shape of the rolled piece, increasing the amount of cutting loss.

[0034] To address the aforementioned problems, this embodiment provides a rolling method for optimizing the planar shape of steel plates, such as... Figure 1 As shown, the method includes: Step 100: Before longitudinal and transverse rolling of the slab, longitudinal and transverse rolling of the slab is performed a preset number of times based on the planar shape control parameters of longitudinal and transverse rolling.

[0035] Understandably, the preset number of times refers to the number of sets of longitudinal and transverse rolling stages that need to be added in advance before the traditional longitudinal and transverse rolling strategy. It can be 1 time, 2 times or more, and is dynamically calculated based on the dimensional relationship between the slab and the finished product.

[0036] It should be noted that each longitudinal and transverse rolling process includes a forming stage and a widening stage. Specifically, the forming stage is usually to eliminate the influence of the slab surface and improve the accuracy of width control. At this time, the length of the rolled piece increases while the change in the width direction is small. The widening stage refers to the stage in which the rolled piece undergoes widening deformation on the rolling mill. At this time, the width of the rolled piece increases while the change in the length direction is small.

[0037] The rolling method for optimizing the planar shape of steel plates provided in this application determines a preset number of passes based on the original width ratio and original elongation ratio of the slab, as well as the initial width ratio and initial elongation ratio when the slab enters the longitudinal rolling stage, before performing conventional longitudinal and transverse rolling on the slab. The corresponding longitudinal and transverse rolling operations are then performed according to this preset number of passes. Since the thickness, width, and length of the rolled piece change after each longitudinal and transverse rolling pass, the planar shape control parameters are dynamically adapted to the actual deformation of the rolled piece in each pass. This allows for precise pre-adjustment of the width ratio and elongation ratio of the slab, ensuring that the rolled piece has a reasonable dimensional proportion and deformation basis matching the target specifications before entering the longitudinal and transverse rolling stage. This effectively avoids planar shape defects such as irregular edges, head and tail deformation, and uneven width caused by unreasonable distribution of width and elongation during subsequent rolling processes, effectively controlling the planar shape and improving the rectangularity of the final finished steel plate. Simultaneously, it reduces the number of subsequent adjustment passes and rolling load, improving rolling stability and finished product yield.

[0038] It should be noted that the method in this embodiment is particularly suitable for rolling slabs with a large width ratio. Specifically, the original width ratio of the slab is greater than or equal to 1.8. When the width ratio of the slab is less than 1.8, the metal flow during the rolling process is relatively uniform, and a relatively ideal rectangularity can be obtained by using the traditional longitudinal and transverse rolling strategy combined with conventional planar shape control. However, when the width ratio reaches 1.8 or higher, the uneven deformation of the slab during the widthening process increases sharply, and the edge convexity becomes significant.

[0039] In one embodiment, prior to step 100, the method for determining the preset number of times specifically includes the following steps: Step 201: Calculate the original width ratio and original elongation ratio based on the original dimensions of the slab and the target dimensions of the finished product.

[0040] The original dimensions of the slab are its dimensions before processing. The target dimensions of the finished product are the dimensions of the steel plate after processing as needed. The original dimensions and target dimensions can be further subdivided into thickness, width, and length.

[0041] The original width ratio reflects the degree of deformation in the width direction of the slab during rolling, and can be expressed as: ; The original elongation ratio reflects the degree of deformation along the length of the slab during rolling, and can be expressed as: ; In the formula, This is the original aspect ratio; The original elongation ratio; The target width of the finished product; This represents the original width of the slab; The target length of the finished product; This represents the original length of the slab.

[0042] Step 202: Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, determine the initial width ratio and the initial elongation ratio.

[0043] Specifically, the initial width ratio and initial elongation ratio of the slab when it enters the longitudinal and transverse rolling stage, that is, after the longitudinal and transverse rolling is completed, can be calculated using the following formulas: ; ; In the formula, This is the initial aspect ratio; This is the initial elongation ratio; The initial width of the slab when entering the longitudinal and transverse rolling stages; This refers to the initial length of the slab when it enters the longitudinal and transverse rolling stages.

[0044] It should be noted that the initial dimensions of the slab when entering the longitudinal and transverse rolling stage, that is, the dimensions that ensure the planar shape of the slab meets the requirements after traditional longitudinal and transverse rolling, can be derived by back-calculation based on the target dimensions of the finished product and the rolling control parameters indicated in the longitudinal and transverse rolling strategy.

[0045] Step 203: Determine the preset number of times based on the ratio between the original width ratio and the initial width ratio.

[0046] In this embodiment, the original width ratio and original elongation ratio are directly calculated from the original slab dimensions and the target finished product dimensions. Simultaneously, the initial width ratio and initial elongation ratio of the slab entering the longitudinal and transverse rolling stages are determined using the target finished product dimensions and control parameters of the longitudinal and transverse rolling stages. The ratio of these two ratios to the width ratio reflects the degree of change in the width direction during rolling, and this is used as the basis for determining the preset number of longitudinal and transverse rolling passes. This achieves precise quantitative setting of the rolling passes, avoiding the problems of too many or too few passes caused by relying on experience-based settings, and ensuring a high degree of matching between the early rolling process and the final finished product size requirements. Furthermore, it stably controls the slab deformation distribution law, improves the controllability of the width and elongation ratios, reduces shape deviations and dimensional errors, and increases the standardization and yield of the rolling process.

[0047] Specifically, based on the ratio between the original width ratio and the initial width ratio, a preset number of iterations is determined, including: calculating the change between the original width ratio and the initial width ratio; calculating the ratio of the change to the preset width optimization coefficient and rounding it up to the nearest positive integer to obtain the preset number of iterations.

[0048] Furthermore, the preset number of times can be calculated using the following formula: ; in, The smallest integer that satisfies the above inequality; This is the original aspect ratio; This is the initial aspect ratio; The preset widening optimization coefficient can be determined based on the theoretical widening ratio controlled by the planar shape of the longitudinal and transverse stages.

[0049] In one embodiment, prior to step 100, the method for determining the planar shape control parameters specifically includes the following steps: Step 311: Based on the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab when entering the longitudinal and transverse rolling stage, and the preset number of times, calculate the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling respectively.

[0050] Where i is a positive integer.

[0051] It is understandable that when i-1=0, the stage dimensions of the workpiece obtained after the (i-1)th longitudinal and transverse rolling are the original dimensions of the slab before processing. When i=n, ​​the stage dimensions, stage width ratio, and stage elongation ratio of the workpiece obtained after the i-th longitudinal and transverse rolling are the initial dimensions, initial width ratio, and initial elongation ratio of the slab before entering the longitudinal and transverse rolling stage. The initial dimensions of the slab before entering the longitudinal and transverse rolling stage, that is, the dimensions that ensure the planar shape of the slab meets the requirements after conventional longitudinal and transverse rolling, can be deduced from the target dimensions of the finished product and the rolling control parameters indicated in the longitudinal and transverse rolling strategy.

[0052] Furthermore, step 311 uses the following calculation formula: ; ; ; In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The initial width of the slab when entering the longitudinal and transverse rolling stages; The initial length of the slab when entering the longitudinal and transverse rolling stages; This is the preset number of times.

[0053] It is evident that the dimensional change at each stage is actually a linear or proportional distribution of the total deformation. For example, the formula for calculating the width shows that the width after the i-th longitudinal and transverse rolling is based on the previous width, approaching the target width by one step.

[0054] Step 312: Based on the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stage, and the preset number of times, determine the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling.

[0055] Specifically, step 312 uses the following calculation formula: ; ; In the formula, The stage width ratio for the i-th longitudinal and transverse rolling process; The stage elongation ratio is the i-th longitudinal and transverse rolling process. The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The initial width of the slab when entering the longitudinal and transverse rolling stages; This refers to the initial length of the slab when it enters the longitudinal and transverse rolling stages.

[0056] Step 313: Based on the stage dimensions of the i-th longitudinal and transverse rolling, determine the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling respectively.

[0057] In this embodiment, based on the stage dimensions obtained from the previous rolling stage, the initial dimensions required when entering the longitudinal and transverse rolling stages, and the total preset number of passes, the stage dimensions to be reached at the end of the current rolling pass are calculated precisely step by step. The corresponding stage width ratio and stage elongation ratio are then decomposed and matched to determine suitable planar shape control parameters. This achieves uniform distribution and precise recursion of deformation during multi-pass longitudinal and transverse rolling, ensuring a smooth transition of width and elongation deformation along the target dimension direction in each pass. This avoids problems such as planar shape distortion, uneven beginning and end, and edge defects caused by excessive deformation in a single pass or uneven distribution. Simultaneously, the planar shape control parameters of each pass are highly matched with the stage deformation requirements, significantly improving the controllability and dimensional accuracy consistency of the rolling process. This ensures a high degree of matching between the exit state of the longitudinal and transverse rolling stages and the entry conditions of subsequent longitudinal rolling stages, achieving a smooth transition throughout the entire multi-stage rolling process.

[0058] In another embodiment, prior to step 100, the method for determining the planar shape control parameters specifically includes the following steps: Step 321: Based on the original dimensions of the slab and the initial dimensions of the slab when it enters the longitudinal and transverse rolling stages, the original dimensions are evenly distributed to each longitudinal and transverse rolling stage, and the stage width ratio and stage extension ratio of each longitudinal and transverse rolling stage are determined.

[0059] Specifically, the stage width ratio is expressed as: ; The stage extension ratio is expressed as: ; In the formula, The stage width ratio for the i-th longitudinal and transverse rolling process; The stage elongation ratio is the i-th longitudinal and transverse rolling process. Original width; This is the original length; The initial width of the slab when entering the longitudinal and transverse rolling stages; This refers to the initial length of the slab when it enters the longitudinal and transverse rolling stages.

[0060] Step 322: Calculate the stage dimensions for each longitudinal and transverse rolling based on the initial dimensions, stage width ratio, and stage elongation ratio.

[0061] Step 323: Based on the stage dimensions, determine the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages.

[0062] In this embodiment, the total deformation from the original slab dimensions to the initial dimensions before the start of longitudinal and transverse rolling is evenly distributed across each longitudinal and transverse rolling stage to determine the width and elongation ratios for each stage. Then, the dimensions of each stage are calculated in reverse based on these width and elongation ratios, and corresponding planar shape control parameters are matched accordingly. This ensures a smooth transition in longitudinal and transverse rolling deformation while achieving uniform step-by-step control of width and elongation deformation during multi-pass rolling. This avoids distortion of the rolled piece's planar shape, width-to-thickness ratio imbalance, and edge quality defects caused by concentrated or uneven deformation, resulting in a smooth transition of rolled piece dimensions and consistent deformation patterns. Furthermore, the even distribution method is simple to calculate and has clear control logic, facilitating rapid execution and adaptive parameter adjustment by the rolling system. This improves slab forming accuracy and dimensional stability, simplifies the control model, and effectively increases rolling efficiency and finished product yield.

[0063] Furthermore, the planar shape control parameters include the steady-state length of the plateau segment, the unsteady-state horizontal length, and the planar shape control height. The cross-section of the rolled piece during the forming and widening stages is as follows: Figure 3 and Figure 4 As shown. Steady-state length of the platform segment. , Adjustments are typically made based on actual production conditions, and are generally fixed values. For non-steady-state horizontal lengths... , and planar shape control height , It can be obtained using the following calculation formula: ; ; ; ; In the formula, is the unsteady horizontal length during the forming stage of the i-th longitudinal and transverse rolling process; The unsteady horizontal length during the widening stage in the i-th longitudinal and transverse rolling process; The height is the planar shape control height during the forming stage of the i-th longitudinal and transverse rolling process. The height is used to control the planar shape during the widening stage of the i-th longitudinal and transverse rolling process. Horizontal velocity; Vertical velocity; The stage width ratio for the i-th longitudinal and transverse rolling process; is the stage elongation ratio of the i-th longitudinal and transverse rolling.

[0064] In one specific embodiment, such as Figure 2As shown, during the rolling process, one or more sets of "longitudinal and transverse" stages are added before the longitudinal and transverse rolling strategy according to the width ratio and elongation ratio. In conjunction with the longitudinal rolling stage planar shape control, the initial width ratio and elongation ratio under the final longitudinal and transverse rolling strategy are continuously adjusted in this way to make them fall within a reasonable range, effectively controlling and optimizing the rectangularity of the finished steel plate.

[0065] Specifically, the slab dimensions are: thickness H = 450mm, width W = 1800mm, and length L = 3600mm. The target thickness h of the finished product is 20mm, the target width w is 4000mm, and the target length l is 36450mm. The equipment horizontal speed... Vertical velocity: 1000 mm / s The speed is 15 mm / s. Based on the target dimensions of the finished product, determine the initial thickness under the final longitudinal and transverse rolling strategy. The initial width is 270mm. It is 2500mm in length, initial length It is 4320mm.

[0066] The original width ratio is calculated according to the formula. Original extension ratio They are respectively: ; ; The initial width ratio under the longitudinal and transverse rolling strategy is calculated according to the formula. and initial elongation ratio They are respectively: ; ; Therefore, we can calculate: ; pass Rounding up determines that the number of additional "longitudinal and transverse" stage groups, n, is 2, and thus the thickness of the rolled piece after 2 stages is obtained. , width of rolled piece and length of rolled piece Initial thickness under the final longitudinal and transverse rolling strategy Initial width and initial length Same, that is: ; ; ; The stage width ratio and stage elongation ratio for each longitudinal and transverse rolling process are determined using the following formulas: ; ; The thickness of the rolled piece after the first longitudinal and transverse rolling stage is determined according to the following formula. , width of rolled piece and length of rolled piece They are respectively: ; ; ; Furthermore, based on the above results, all dimensions for all stages are obtained. This allows for the development of appropriate rolling procedures according to equipment capabilities, calculation of corresponding planar shape control parameters, and commencement of production. Specifically, the steady-state length of the platform segment during the forming stage... The steady-state length of the platform segment during the widening phase is 150mm. It is 100mm.

[0067] Combination Figure 3 and Figure 4 This yields the planar shape control parameters for each longitudinal and transverse stage and the final longitudinal and transverse stage. The planar shape control parameters for each longitudinal and transverse stage are as follows: ; ; ; ; The final longitudinal and transverse phase planar shape control parameters are as follows: ; ; ; .

[0068] This embodiment proposes to add one or more sets of "transverse" rolling stages before the longitudinal rolling strategy, continuously adjust and change the width ratio and elongation ratio, so that the new target width ratio and elongation ratio obtained before the longitudinal rolling strategy are within a reasonable range, effectively control the planar shape, and improve the rectangularity of the final finished steel plate.

[0069] The rolling method for optimizing the planar shape of steel plates provided in this application can be applied to a terminal, a server, or software running on either a terminal or a server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, etc.; the server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms.

[0070] It should be noted that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0071] Furthermore, such as Figure 5 As shown, as a specific implementation of the above-mentioned rolling method for optimizing the planar shape of steel plates, this application embodiment provides a rolling apparatus 500 for optimizing the planar shape of steel plates, which includes a control module 501.

[0072] The control module 501 is used to perform longitudinal and transverse rolling on the slab a preset number of times based on the planar shape control parameters of longitudinal and transverse rolling before the slab enters the longitudinal and transverse rolling stage, so as to adjust the width ratio and elongation ratio of the slab before it enters the longitudinal and transverse rolling stage. The preset number of times is determined based on the original width ratio and original elongation ratio of the slab, as well as the initial width ratio and initial elongation ratio when the slab enters the longitudinal and transverse rolling stage; the planar shape control parameters of the longitudinal and transverse rolling are determined based on the deformation amount of the rolled piece obtained after each longitudinal and transverse rolling; the original width ratio is greater than or equal to 1.8.

[0073] Furthermore, such as Figure 1 As shown, the rolling apparatus 500 for optimizing the planar shape of steel plates also includes: The simulation calculation module 502 is used to calculate the original width ratio and the original elongation ratio based on the original size of the slab and the target size of the finished product; to determine the initial width ratio and the initial elongation ratio based on the target size of the finished product and the control parameters of the longitudinal and transverse rolling stages; and to determine the preset number of times based on the ratio between the original width ratio and the initial width ratio.

[0074] Furthermore, the simulation calculation module 502 is specifically used to calculate the change between the original width ratio and the initial width ratio; calculate the ratio of the change to the preset width optimization coefficient and round it up to the positive integer to obtain the preset number of times.

[0075] Furthermore, the control module 501 is also used to calculate the stage dimensions of the rolled piece after the i-1th longitudinal and transverse rolling based on the stage dimensions of the rolled piece obtained after the i-1th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stage, and the preset number of times; to determine the stage width ratio and stage extension ratio of the i-th longitudinal and transverse rolling based on the stage dimensions of the rolled piece obtained after the i-1th longitudinal and transverse rolling, the initial dimensions, and the preset number of times; and to determine the planar shape control parameters that conform to the stage width ratio and stage extension ratio of the corresponding longitudinal and transverse rolling stage based on the stage dimensions.

[0076] Furthermore, the stage dimensions or the original dimensions of the slab or the target dimensions of the finished product include thickness, width, and length. Based on the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab when entering the longitudinal and transverse rolling stages, and the preset number of times, the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling are calculated using the following calculation formula: ; ; ; In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The thickness of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The width of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The length of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The initial width of the slab before entering the longitudinal and transverse rolling stages; The initial length of the slab before entering the longitudinal and transverse rolling stages; This is the preset number of times.

[0077] Furthermore, the control module 501 is also used to distribute the original dimensions of the slab evenly to each longitudinal and transverse rolling stage based on the original dimensions of the slab and the initial dimensions of the slab when it enters the longitudinal and transverse rolling stages, and to determine the stage width ratio and stage extension ratio of each longitudinal and transverse rolling stage; to calculate the stage dimensions of each longitudinal and transverse rolling stage based on the initial dimensions, the stage width ratio and the stage extension ratio; and to determine the planar shape control parameters that conform to the stage width ratio and stage extension ratio of the corresponding longitudinal and transverse rolling stages based on the stage dimensions.

[0078] Furthermore, longitudinal and transverse rolling includes a forming stage and a widening stage.

[0079] Furthermore, the planar shape control parameters include the steady-state length of the platform segment, the unsteady-state horizontal length, and the planar shape control height.

[0080] Furthermore, based on the stage dimensions, the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages are determined respectively, using the following calculation formula: ; ; ; ; In the formula, is the unsteady horizontal length during the forming stage of the i-th longitudinal and transverse rolling process; The unsteady horizontal length during the widening stage in the i-th longitudinal and transverse rolling process; The height is the planar shape control height during the forming stage of the i-th longitudinal and transverse rolling process. The height is used to control the planar shape during the widening stage of the i-th longitudinal and transverse rolling process. Horizontal velocity; Vertical velocity; The stage width ratio for the i-th longitudinal and transverse rolling process; is the stage elongation ratio of the i-th longitudinal and transverse rolling.

[0081] Specific limitations regarding the rolling apparatus for optimizing the planar shape of steel plates can be found in the limitations of the rolling method for optimizing the planar shape of steel plates mentioned above, and will not be repeated here. Each module in the aforementioned rolling apparatus for optimizing the planar shape of steel plates can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0082] Based on the above, Figure 1 Accordingly, embodiments of this application also provide a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method. Figure 1 The rolling method shown optimizes the planar shape of the steel plate.

[0083] Based on this understanding, the technical solution of this application can be embodied in the form of a software product. The software product can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, or portable hard drive), and includes several instructions to cause a computer device (such as a personal computer, server, or network device) to execute the methods described in the various implementation scenarios of this application.

[0084] Based on the above, Figure 1 The method shown, and Figure 5 The virtual device embodiment shown is designed to achieve the above objectives, such as... Figure 6 As shown in the figure, this application embodiment also provides a computer device 600, which includes a processor 601 and a memory 602. The memory 602 stores a program or instructions that can run on the processor 601. When the program or instructions are executed by the processor 601, they implement the above-mentioned... Figure 1 The rolling method shown optimizes the planar shape of the steel plate.

[0085] The memory 602 can be used to store software programs and various data. The memory 602 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 602 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 602 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0086] Processor 601 may include one or more processing units; optionally, processor 601 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 601.

[0087] Computer equipment can specifically include personal computers, servers, network devices, etc.

[0088] Optionally, the computer device may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, input units such as a keyboard, etc., and optional user interfaces may also include USB ports, card reader ports, etc. The network interface may optionally include standard wired interfaces, wireless interfaces (such as Bluetooth interfaces, Wi-Fi interfaces), etc.

[0089] Those skilled in the art will understand that the computer device structure provided in this embodiment does not constitute a limitation on the computer device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0090] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platform, or it can be implemented by hardware.

[0091] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0092] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A rolling method for optimizing the planar shape of steel plates, characterized in that, The method includes: Based on the original dimensions of the slab and the target dimensions of the finished product, the original width ratio of the slab is calculated, and the original width ratio is greater than or equal to 1.

8. Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, the initial width ratio when the slab enters the longitudinal and transverse rolling stages is determined; Based on the ratio between the original width ratio and the initial width ratio, a preset number of longitudinal and transverse rolling operations is determined; Before the slab is subjected to longitudinal and transverse rolling, the slab is subjected to longitudinal and transverse rolling for the preset number of times based on the planar shape control parameters of longitudinal and transverse rolling, so as to adjust the width ratio and elongation ratio of the slab before entering the longitudinal and transverse rolling stage. Based on the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stage, and the preset number of times, the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling are calculated respectively. Based on the stage dimensions of the workpiece obtained after the i-th longitudinal and transverse rolling, the initial dimensions, and the preset number of times, the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling are determined. Based on the stage dimensions, planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages are determined respectively; The stage dimensions are calculated using the following formula: ； ； ； In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The thickness of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The width of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The length of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The initial width of the slab before entering the longitudinal and transverse rolling stages; The initial length of the slab before entering the longitudinal and transverse rolling stages; This is the preset number of times.

2. The rolling method for optimizing the planar shape of steel plates according to claim 1, characterized in that, The method further includes: Based on the original dimensions of the slab and the target dimensions of the finished product, calculate the original elongation ratio of the slab; Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, the initial elongation ratio of the slab when it enters the longitudinal and transverse rolling stages is determined.

3. The rolling method for optimizing the planar shape of steel plates according to claim 1, characterized in that, Determining the preset number of times based on the ratio between the original width ratio and the initial width ratio includes: Calculate the change between the original aspect ratio and the initial aspect ratio; Calculate the ratio of the change to the preset broadening optimization coefficient and round up to the nearest positive integer to obtain the preset number of times.

4. The rolling method for optimizing the planar shape of steel plates according to claim 1, characterized in that, The stage dimensions, or the original dimensions of the slab, or the target dimensions of the finished product, include thickness, width, and length.

5. The rolling method for optimizing the planar shape of steel plates according to claim 1, characterized in that, The method further includes: Based on the original dimensions of the slab and the initial dimensions of the slab when it enters the longitudinal and transverse rolling stages, the original dimensions are evenly distributed to each longitudinal and transverse rolling stage to determine the stage width ratio and stage extension ratio for each longitudinal and transverse rolling stage. Based on the initial dimensions, the stage width ratio, and the stage elongation ratio, calculate the stage dimensions for each longitudinal and transverse rolling process; Based on the stage dimensions, planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages are determined respectively.

6. The rolling method for optimizing the planar shape of steel plates according to any one of claims 1 to 5, characterized in that, The longitudinal and transverse rolling process includes a forming stage and a widening stage; The planar shape control parameters include the steady-state length of the platform segment, the unsteady-state horizontal length, and the planar shape control height. Based on the stage dimensions, the planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages are determined using the following calculation formula: ； ； ； ； In the formula, is the unsteady horizontal length during the forming stage of the i-th longitudinal and transverse rolling process; The unsteady horizontal length during the widening stage in the i-th longitudinal and transverse rolling process; The height is the planar shape control height during the forming stage of the i-th longitudinal and transverse rolling process. The height is used to control the planar shape during the widening stage of the i-th longitudinal and transverse rolling process. Horizontal velocity; Vertical velocity; The stage width ratio for the i-th longitudinal and transverse rolling process; is the stage elongation ratio of the i-th longitudinal and transverse rolling.

7. A rolling apparatus for optimizing the planar shape of steel plates, characterized in that, The device includes: A simulation calculation module is used to calculate the original width ratio of the slab based on its original dimensions and the target dimensions of the finished product, wherein the original width ratio is greater than or equal to 1.8; and, Based on the target dimensions of the finished product and the control parameters of the longitudinal and transverse rolling stages, the initial width ratio of the slab when entering the longitudinal and transverse rolling stages is determined; and... Based on the ratio between the original width ratio and the initial width ratio, a preset number of longitudinal and transverse rolling operations is determined; The control module is used to perform a preset number of longitudinal and transverse rolling operations on the slab before longitudinal and transverse rolling, based on the planar shape control parameters of the longitudinal and transverse rolling, to adjust the width ratio and elongation ratio of the slab before entering the longitudinal and transverse rolling stage; and, Based on the stage dimensions of the rolled piece obtained after the (i-1)th longitudinal and transverse rolling, the initial dimensions of the slab before entering the longitudinal and transverse rolling stages, and the preset number of times, the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling are calculated respectively; and, Based on the stage dimensions of the rolled piece obtained after the i-th longitudinal and transverse rolling, the initial dimensions, and the preset number of rolling passes, the stage width ratio and stage elongation ratio of the i-th longitudinal and transverse rolling are determined; and, Based on the stage dimensions, planar shape control parameters that conform to the stage width ratio and stage elongation ratio of the corresponding longitudinal and transverse rolling stages are determined respectively; The stage dimensions are calculated using the following formula: ； ； ； In the formula, This represents the original thickness of the slab; This represents the original width of the slab; This represents the original length of the slab; The thickness of the workpiece obtained after the i-th longitudinal and transverse rolling process; The width of the workpiece obtained after the i-th longitudinal and transverse rolling process; The length of the workpiece obtained after the i-th longitudinal and transverse rolling process; The thickness of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The width of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The length of the workpiece obtained after the (i-1)th longitudinal and transverse rolling process; The initial width of the slab before entering the longitudinal and transverse rolling stages; The initial length of the slab before entering the longitudinal and transverse rolling stages; This is the preset number of times.

8. A readable storage medium having a program or instructions stored thereon, characterized in that, When the program or instructions are executed by the processor, they implement the rolling method for optimizing the planar shape of the steel plate as described in any one of claims 1 to 6.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the rolling method for optimizing the planar shape of the steel plate as described in any one of claims 1 to 6.

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