Width-variable and thickness-variable rolling method, device, medium and equipment for medium-thickness plate

Abstract

The invention relates to the technical field of rolling, and discloses a variable-width and variable-thickness rolling method and device for a medium-thickness plate, a medium and equipment. According to the method, variable-width rolling and variable-thickness rolling are sequentially conducted on the medium-thickness plate through the vertical rollers and the flat rollers, and the medium-thickness plate with the width and the thickness capable of continuously changing in the length direction can be rolled. And moreover, the variable width and variable thickness combined rolling process is simulated through the finite element model, and the corresponding relation between the vertical roll reduction rate and the flat roll reduction rate and the width recovery amount of the medium-thickness plate during variable thickness rolling is constructed, so that the combined rolling precision is improved, the shearing amount is reduced, and the utilization rate of the medium-thickness plate is improved by utilizing the corresponding relation.

Description

Technical Field

[0001] The present application relates to the field of rolling technology, and in particular to a method, device, medium and equipment for rolling medium and thick plates with variable width and thickness. Background Art

[0002] As an important steel product, medium and thick plates are widely used in large structures such as wind turbine towers. Based on the structural performance and engineering requirements of wind turbine towers, the thickness of medium and thick plates of wind turbine towers needs to change continuously along the length direction, and the width also needs to gradually narrow along the length direction to form a wedge shape.

[0003] In the related art, LP steel plate (longitudinally profiled plate, longitudinally variable thickness steel plate) is used as steel for wind turbine towers. LP steel plate is a medium-thick plate with thickness continuously changing along the longitudinal direction. In order to meet the width change requirements, the related art will also shear the LP steel plate or the original medium-thick plate of equal width to achieve the effect of width change, but the shearing amount is large, which will reduce the utilization rate of the medium-thick plate and affect production efficiency. Summary of the invention

[0004] In view of this, the present application provides a method, device, medium and equipment for rolling medium and thick plates with variable width and variable thickness, using vertical rolls and flat rolls to sequentially perform variable width rolling and variable thickness rolling on medium and thick plates, rolling out a medium and thick plate whose width and thickness can be continuously changed along the length direction. In addition, by simulating the combined rolling process of variable width and variable thickness through a finite element model, a corresponding relationship between the vertical roll reduction rate and the flat roll reduction rate and the width recovery amount of the medium and thick plate after variable thickness rolling is constructed, thereby utilizing the corresponding relationship to improve the precision of the combined rolling, reduce the shearing amount, and improve the utilization rate of the medium and thick plate.

[0005] According to one aspect of the present application, a method for rolling a medium and thick plate with variable width and thickness is provided, comprising: Construct the rolling finite element model of medium and thick plate rolled products; In the rolling finite element model, the medium and thick plate rolled piece is subjected to variable width rolling by using vertical rolls, and a target position point is marked in the medium and thick plate rolled piece after the variable width rolling to obtain a first rolled piece, and the first rolled piece is subjected to variable thickness rolling by using flat rolls to obtain a second rolled piece; Determine the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; According to the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point, a corresponding relationship between the vertical roll reduction rate and flat roll reduction rate and the width recovery amount is established; According to the corresponding relationship and the finished product size corresponding to the medium and thick plate to be rolled, the medium and thick plate to be rolled is subjected to variable width rolling and variable thickness rolling to obtain a target rolled piece.

[0006] According to another aspect of the present application, there is provided a medium and thick plate variable width and variable thickness rolling device, comprising: A simulation module is used to construct a rolling finite element model of a medium and thick plate rolled piece; and in the rolling finite element model, the medium and thick plate rolled piece is subjected to variable width rolling using vertical rolls, and a target position point is marked in the medium and thick plate rolled piece after the variable width rolling to obtain a first rolled piece, and the first rolled piece is subjected to variable thickness rolling using flat rolls to obtain a second rolled piece; A determination module, for determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; and, for establishing a corresponding relationship between the vertical roll reduction rate and the flat roll reduction rate and the width recovery amount according to the vertical roll reduction rate, flat roll reduction rate and the width recovery amount corresponding to the target position point; The rolling module is used to perform variable width rolling and variable thickness rolling on the medium and thick plate to be rolled according to the corresponding relationship and the finished product size corresponding to the medium and thick plate to be rolled, so as to obtain the target rolled product.

[0007] According to another aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the above-mentioned method for rolling medium and thick plates with variable width and thickness are implemented.

[0008] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and running on the processor, and when the processor executes the program, the steps of the above-mentioned method for rolling medium and thick plates with variable width and thickness are implemented.

[0009] By means of the above technical scheme, the present application provides a method, device, medium and equipment for rolling medium and thick plates with variable width and thickness. First, the medium and thick plates are rolled with vertical rollers to change the width of the medium and thick plates, and the gap between the vertical rollers is continuously changed so that the width of the medium and thick plates can be continuously changed along the length direction to achieve variable width rolling. Then, the medium and thick plates after variable width rolling are rolled with flat rollers to change the thickness of the medium and thick plates after variable width rolling, and the gap between the flat rollers is continuously changed so that the thickness of the medium and thick plates after variable width rolling can be continuously changed along the length direction to achieve variable thickness rolling, thereby rolling a medium and thick plate whose width and thickness can be continuously changed along the length direction. In addition, the present application simulates the combined rolling process of variable width and variable thickness through a finite element model, and constructs a corresponding relationship between the vertical roll reduction rate and the flat roll reduction rate and the recovery amount in the width direction of the medium and thick plate when it undergoes variable thickness rolling, so as to accurately predict the width recovery amount of the medium and thick plate after rolling at different vertical roll reduction rates and flat roll reduction rates during the combined rolling process, so as to reasonably set the combination of the vertical roll reduction rate and the flat roll reduction rate in the actual combined rolling process according to the corresponding relationship, so that the width of the medium and thick plate after the actual combined rolling can be closer to the required finished product size, thereby improving the rolling accuracy, thereby minimizing the shear amount in the width direction of the medium and thick plate, increasing the utilization rate of the medium and thick plate, and thereby improving the efficiency of actual production.

[0010] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic flow chart of a method for rolling a medium and thick plate with variable width and thickness provided in an embodiment of the present application is shown; Figure 2 A schematic diagram of the structure of variable width rolling provided by an embodiment of the present application is shown; Figure 3 A schematic diagram of the structure of variable thickness rolling provided by an embodiment of the present application is shown; Figure 4 The embodiment of the present application shows a medium and thick plate with a width and thickness that continuously changes along the length direction; Figure 5 A top view of variable width rolling provided by an embodiment of the present application is shown; Figure 6A top view of a medium and thick plate rolled piece after variable width rolling provided in an embodiment of the present application is shown; Figure 7 A side view of variable thickness rolling provided by an embodiment of the present application is shown; Figure 8 A side view of a second rolled piece provided in an embodiment of the present application is shown; Fig. 9 shows a first cross-sectional view provided by an embodiment of the present application; Fig.10 A second cross-sectional view provided in an embodiment of the present application is shown; Fig.11 A three-dimensional relationship diagram between the width recovery amount and the vertical roll and flat roll reduction rate provided in an embodiment of the present application is shown; Fig.12 The fitting surface provided by the embodiment of the present application is shown; Fig.13 The structural block diagram of the medium and thick plate variable width and thickness rolling device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0012] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0013] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0014] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the 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 refer to an element as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, or there may be intermediate elements. In addition, the "connection" or "connection" used herein may include wireless connection or wireless fusion. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0015] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0016] In this embodiment, a method for rolling a medium and thick plate with variable width and thickness is provided. Figure 1 As shown, the method includes: Step 101, constructing a rolling finite element model of a medium and thick plate rolled piece.

[0017] In this embodiment, the two-pass rolling process of variable width rolling and variable thickness rolling is simulated by a finite element model, replacing the physical experiment, to provide accurate data for subsequent steps.

[0018] Specifically, the medium and thick plates that need to change width and thickness in actual application scenarios are used as the rolled products for combined rolling of variable width and variable thickness to obtain medium and thick plate rolled products. According to the initial size and material properties of the medium and thick plate rolled products, a rolling finite element model of the medium and thick plate rolled products is established to simulate the phenomena such as the movement of the rolls, the change of the roll reduction, and the metal flow behavior in the medium and thick plate during the actual combined rolling process in the rolling finite element model.

[0019] Here, the initial size of the medium and thick plate rolled product may include the initial length, initial width and initial thickness of the medium and thick plate rolled product.

[0020] It should be noted that medium and thick plates are flat steel with a large width-to-thickness ratio and surface area, and are regular-shaped steel plates. The rolling process is a process in which the friction between the rolled piece and the rollers pulls the rolled piece between the rollers rotating in different directions, causing it to undergo plastic deformation.

[0021] Step 102, in the rolling finite element model, use vertical rolls to perform variable width rolling on the medium and thick plate workpiece, mark the target position point in the medium and thick plate workpiece after variable width rolling to obtain a first workpiece, and use flat rolls to perform variable thickness rolling on the first workpiece to obtain a second workpiece.

[0022] In this embodiment, firstly, variable width rolling is performed on a medium and thick plate in a rolling finite element model.

[0023] Specifically, Figure 2As shown, a first stopper 203 is provided at one end of the medium and thick plate rolled piece 202 in the length direction to prevent the medium and thick plate rolled piece 202 from deflecting during rolling, so as to ensure the stability of the rolling process. Vertical rollers 201 are provided at one end of the medium and thick plate rolled piece 202 in the length direction away from the first stopper 203, and the vertical rollers 201 are symmetrically provided at both sides of the medium and thick plate rolled piece 202 in the width direction, and these two sides are used as the first starting sides of the medium and thick plate rolled piece 202, and the two symmetrical sides of the connection between the medium and thick plate rolled piece 202 and the first stopper 203 in the width direction of the medium and thick plate rolled piece 202 are used as the first stopping sides of the medium and thick plate rolled piece 202.

[0024] Here, the length direction of the vertical roller is parallel to the thickness direction of the medium and thick plate rolled piece, and the roller body length of the vertical roller is greater than the thickness of the medium and thick plate rolled piece to ensure that effective pressure can be continuously applied to the width direction of the medium and thick plate rolled piece during the variable width rolling process.

[0025] Furthermore, the vertical rollers are used to perform variable width rolling on the medium and thick plate workpiece, so that the vertical rollers move from the first starting side of the medium and thick plate workpiece to the first stopping side along the length direction of the medium and thick plate workpiece, so as to roll the medium and thick plate workpiece with the vertical rollers to change the width of the medium and thick plate. At the same time, the roll gap between the vertical rollers is continuously changed so that the width of the medium and thick plate workpiece can continuously change along the length direction, thereby realizing variable width rolling of the medium and thick plate workpiece.

[0026] In addition, a limited number of target position points are marked in the medium and thick plate workpiece after variable width rolling, and the marked medium and thick plate workpiece is used as the first workpiece. The same position is accurately located in the second workpiece obtained by variable thickness rolling through the marked target position points, thereby clarifying the recovery amount in the width direction of the same position in the medium and thick plate workpiece before and after variable thickness rolling.

[0027] It should be noted that the target position point is selected at a place where the rolling is stable in the middle section of the medium and thick plate rolled piece after variable width rolling to prevent errors.

[0028] Then, variable thickness rolling is performed on the first rolled piece in the rolling finite element model.

[0029] Specifically, Figure 3 As shown, a second stopper 303 is provided at a narrower end of the first rolled piece 302 along the length direction to prevent the first rolled piece 302 from deflecting during rolling, so as to ensure the stability of the rolling process. A flat roller 301 is provided at a wider end of the first rolled piece 302 along the length direction, and the flat rollers 301 are symmetrically provided at both sides of the first rolled piece 302 along the thickness direction, and these two sides are used as the second starting sides of the first rolled piece 302, and the two sides symmetrically at the connection between the first rolled piece 302 and the second stopper 303 along the thickness direction of the first rolled piece 302 are used as the second stopping sides of the first rolled piece 302.

[0030] Here, the length direction of the flat roller is parallel to the width direction of the first rolled piece, and the roller body length of the flat roller is greater than the width of the first rolled piece to ensure that effective pressure can be continuously applied to the thickness direction of the first rolled piece during the variable thickness rolling process.

[0031] Furthermore, the first workpiece is subjected to variable thickness rolling by using flat rollers, so that the flat rollers move from the second starting side of the first workpiece to the second stopping side along the length direction of the first workpiece, so that the first workpiece is rolled by using flat rollers to change the thickness of the first workpiece. At the same time, the gap between the flat rollers is continuously changed so that the thickness of the first workpiece can be continuously changed along the length direction, thereby achieving variable thickness rolling of the first workpiece to obtain the second workpiece. Then, by the combined rolling method of variable width and variable thickness, a medium and thick plate (such as Figure 4 as shown).

[0032] in, Figure 2 , Figure 3 , Fig. 9 and Fig.10 In the figure, x, y, and z are the three axes of the three-dimensional space coordinate system, namely, the x-axis, the y-axis, and the z-axis. Here, the x-axis represents the length direction, the y-axis represents the width direction, and the z-axis represents the thickness direction. This application describes the spatial dimensions of the medium and thick plate rolled piece, the first rolled piece, and the second rolled piece through these three dimensions.

[0033] In actual application scenarios, a rolling mill that performs variable width rolling and variable thickness rolling needs to continuously change the roll gap between the vertical rolls and the roll gap between the flat rolls under load. In this embodiment, a finite element model is used to better simulate the complex forming process of medium and thick plates and reduce the number of experiments.

[0034] It should be noted that the roll gap refers to the gap between the two rolls during the rolling process.

[0035] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, variable-width rolling of medium and thick plate workpieces is performed using vertical rollers, including: obtaining a vertical roller reduction rate range; determining a first inward speed of the vertical roller according to the initial width of the medium and thick plate workpiece and the vertical roller reduction rate range, and determining a first linear speed of the vertical roller; according to the first inward speed and the first linear speed, variable-width rolling of the medium and thick plate workpieces is performed using vertical rollers, so that the vertical rollers move from a first starting side of the medium and thick plate workpiece along the length direction of the medium and thick plate workpiece at a first linear speed toward a first stopping side of the medium and thick plate workpiece, and the vertical rollers move from the first starting side of the medium and thick plate workpiece along the width direction of the medium and thick plate workpiece at a first inward speed toward the medium and thick plate workpiece.

[0036] The first starting side and the first stopping side are determined according to the length direction and the width direction of the medium and thick plate rolled piece.

[0037] In this embodiment, when the medium and thick plate workpiece is subjected to variable width rolling, while the vertical rollers are moved along the length direction of the medium and thick plate workpiece, a first inward speed for the vertical rollers to move along the width direction of the medium and thick plate workpiece is set, so that the vertical rollers move toward the medium and thick plate workpiece at a uniform speed along the width direction of the medium and thick plate workpiece according to the first inward speed, thereby realizing a continuous change in the roll gap between the vertical rollers. In addition, the first inward speed of the vertical rollers can be used to accurately adjust the continuous change of the width of the medium and thick plate workpiece along the length direction, thereby improving the rolling accuracy in the width direction.

[0038] Exemplarily, the first linear speed of the vertical roller along the length direction of the medium and thick plate rolled piece is determined according to the rotation speed and radius of the vertical roller. v ' (mm / s, millimeter per second), expressed as: Among them, R 1 is the radius of the vertical roller, mm (millimeter); n 1 is the rotation speed of the vertical roll, r / min (revolutions per minute). Here, the rotation speed and radius of the vertical roll can be pre-set in the rolling finite element model according to the common parameters of the vertical roll in the actual application scenario.

[0039] Furthermore, the vertical roll reduction rate range is obtained.

[0040] It should be noted that the vertical roll reduction rate mentioned in this application is the ratio between the change in the width of the workpiece (or the amount of reduction) caused by the vertical rolls on both sides of the workpiece and the original width of the workpiece, so as to quantify the change in the width of the workpiece caused by the vertical rolls through the vertical roll reduction rate.

[0041] Here, the vertical roll reduction rate range in variable width rolling can be set according to the vertical roll reduction rate commonly used in actual application scenarios to improve the versatility of variable width rolling. For example, the vertical roll reduction rate range is 0.8%-5.2%.

[0042] Therefore, according to the range of the vertical roll reduction rate and the initial width of the medium and thick plate rolled piece, the range of the change in the width of the medium and thick plate rolled piece, that is, the range of the vertical rolls on both sides of the medium and thick plate rolled piece to the width of the medium and thick plate rolled piece is determined. Furthermore, according to the range of the vertical rolls on both sides of the medium and thick plate rolled piece to the width of the medium and thick plate rolled piece, the first inward speed of the vertical rolls is determined.

[0043] Then, if Figure 5 As shown, Figure 5The top view of the variable width rolling provided by the embodiment of the present application is shown. According to the first inward speed and the first linear speed, the vertical rollers are used to perform variable width rolling on the medium and thick plate rolled piece, so that the vertical rollers move from the first starting side of the medium and thick plate rolled piece along the length direction of the medium and thick plate rolled piece at the first linear speed to the first stopping side of the medium and thick plate rolled piece to change the width of the medium and thick plate rolled piece. At the same time, the vertical rollers are moved toward the medium and thick plate rolled piece from the first starting side of the medium and thick plate rolled piece along the width direction of the medium and thick plate rolled piece at the first inward speed to achieve continuous change of the roll gap between the vertical rollers, so that the width of the medium and thick plate rolled piece changes continuously along the length direction.

[0044] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the first inward speed of the vertical roll is determined according to the initial width of the medium and thick plate rolled product and the range of the vertical roll reduction rate, including: determining the second target width between the first starting side and the first target width between the first stopping side according to the initial width of the medium and thick plate rolled product and the range of the vertical roll reduction rate; determining the first inward speed according to the first target width, the second target width, the initial length of the medium and thick plate, and the radius and rotation speed of the vertical roll.

[0045] For example, Figure 6 As shown in the figure, it is assumed that the initial width of the plate is W , the vertical roll reduction rate range is m %- n %, then the range of the reduction of the width of the plate rolled by the vertical rolls on both sides of the plate rolled is a - b ,in, It can be further obtained that the widest end width of the medium and thick plate after variable width rolling (i.e. the second target width) for , the narrowest end width of the medium and thick plate after variable width rolling (i.e. the first target width) is .

[0046] In actual application scenarios, the size of the finished product can be determined according to the required finished product size of the medium and thick plate rolled products. and .

[0047] It should be noted that in order to perform variable width rolling of medium and thick plate products according to the range of vertical roll reduction rate, before variable width rolling, the initial roll gap between the vertical rolls is set to , so that at the beginning of variable width rolling, the width between the first starting sides of the medium and thick plate rolled piece can be directly rolled to In the process of variable width rolling, the vertical rollers move in the width direction, so that when the vertical rollers move to the first stop side of the medium and thick plate rolled piece, the width between the first stop sides of the medium and thick plate rolled piece can be rolled to .

[0048] Furthermore, during the variable width rolling process, the distance that the vertical roll moves along the width direction of the medium and thick plate rolled piece is for , the time for the vertical roller to move along the length direction of the medium and thick plate rolled product for ,in, L 1 is the initial length of the medium and thick plate rolled product.

[0049] It can be understood that the time for the vertical rollers to move along the width direction of the medium and thick plate rolled piece is the same as the time for the vertical rollers to move along the length direction of the medium and thick plate rolled piece.

[0050] Furthermore, the first inward speed of the vertical roller moving along the width direction of the medium and thick plate rolled piece toward the medium and thick plate rolled piece is for: .

[0051] in, The unit is millimeter per second, mm / s; , , L 1 , a , b The unit is millimeter, mm.

[0052] In this embodiment, the first inward speed of the vertical roller can be reasonably adjusted according to the specific rolling requirements in the actual application scenario, so as to ensure the accuracy and stability of the variable width rolling process, so that the width of the medium and thick plate rolled product can change in the expected manner and degree, and realize precise variable width rolling.

[0053] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, using flat rolls to perform variable thickness rolling on the first workpiece includes: obtaining a flat roll reduction rate range; determining a second inward speed of the flat roll according to the initial thickness of the medium and thick plate workpiece and the flat roll reduction rate range, and determining a second linear speed of the flat roll; based on the second inward speed and the second linear speed, using flat rolls to perform variable thickness rolling on the first workpiece, so that the flat roll moves from the second starting side of the first workpiece along the length direction of the first workpiece at the second linear speed toward the second stop side of the first workpiece, and the flat roll moves from the second starting side of the first workpiece along the thickness direction of the first workpiece at the second inward speed toward the first workpiece.

[0054] The second starting side and the second stopping side are determined according to the length direction and the thickness direction of the first rolled piece.

[0055] In this embodiment, when the first workpiece is subjected to variable thickness rolling, while the flat roller is moved along the length direction of the first workpiece, a second inward speed is set for the flat roller to move along the thickness direction of the first workpiece, so that the flat roller moves toward the first workpiece at a uniform speed along the thickness direction of the first workpiece according to the second inward speed, thereby achieving continuous change of the roll gap between the flat rollers. In addition, the second inward speed of the flat roller can be used to accurately adjust the continuous change of the thickness of the first workpiece along the length direction, thereby improving the rolling accuracy in the thickness direction.

[0056] Exemplarily, the second linear speed of the flat roll along the length direction of the first rolled piece is determined according to the rotation speed and radius of the flat roll. (mm / s), expressed as: .in, R 2 is the radius of the flat roller, mm; n 2 is the rotation speed of the flat roll, r / min. Here, the rotation speed and radius of the flat roll can be pre-set in the rolling finite element model according to the common parameters of the flat roll in the actual application scenario.

[0057] Furthermore, the flat roll reduction rate range is obtained.

[0058] It should be noted that the flat roll reduction rate described in this application is the ratio between the change in the thickness of the workpiece (or the amount of reduction) caused by the flat rolls on both sides of the workpiece and the original thickness of the workpiece, so as to quantify the change in the thickness of the workpiece caused by the flat rolls through the flat roll reduction rate.

[0059] Here, the flat roll reduction rate range in variable thickness rolling can be set according to the flat roll reduction rate commonly used in actual application scenarios to improve the versatility of variable thickness rolling. For example, the flat roll reduction rate range is 5.1%-20.5%.

[0060] Therefore, according to the range of the flat roll reduction rate and the thickness of the first rolled piece, the range of the change in the thickness of the first rolled piece, that is, the range of the reduction of the thickness of the first rolled piece by the flat rolls on both sides of the first rolled piece, is determined. Furthermore, according to the range of the reduction of the thickness of the first rolled piece by the flat rolls on both sides of the first rolled piece, the second inward speed of the flat roll is determined.

[0061] It should be noted that, in this embodiment, the effect of variable width rolling on the thickness of the medium and thick plate rolled piece is ignored, and the thickness of the first rolled piece is approximately equal to the initial thickness of the medium and thick plate rolled piece.

[0062] Then, if Figure 7 As shown, Figure 7The side view of the variable thickness rolling provided by the embodiment of the present application is shown. According to the second inward speed and the second linear speed, the first workpiece is subjected to variable thickness rolling using a flat roller, so that the flat roller moves from the second starting side of the first workpiece along the length direction of the first workpiece to the second stop side of the first workpiece at the second linear speed to change the thickness of the first workpiece. At the same time, the flat roller moves from the second starting side of the first workpiece along the thickness direction of the first workpiece at the second inward speed toward the first workpiece, realizing continuous change of the roll gap between the flat rollers, so that the thickness of the first workpiece changes continuously along the length direction.

[0063] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the second inward speed of the flat roll is determined according to the initial thickness of the medium and thick plate rolled piece and the flat roll reduction rate range, including: determining the second target thickness between the second starting side and the first target thickness between the second stopping side according to the initial thickness of the medium and thick plate rolled piece and the flat roll reduction rate range; determining the second inward speed according to the first target thickness, the second target thickness, the length of the first rolled piece, and the radius and rotation speed of the flat roll.

[0064] For example, Figure 8 As shown, it is assumed that the thickness of the first rolled piece (i.e. the initial thickness of the medium and thick plate rolled piece) is H , the flat roll reduction rate range is p %- q %, then the range of the reduction of the thickness of the first rolled piece by the flat rolls on both sides of the first rolled piece is c - d ,in, It can be further obtained that the thickest end thickness (i.e., the second target thickness) of the first rolled piece (i.e., the second rolled piece) after variable thickness rolling is for , the thinnest end thickness of the first rolled piece after variable thickness rolling (i.e. the first target thickness) for .

[0065] In actual application scenarios, the size of the finished product can be determined according to the required finished product size of the medium and thick plate rolled products. and .

[0066] It should be noted that, in order to perform variable thickness rolling on the first rolled piece according to the flat roll reduction rate range, before variable thickness rolling, the initial roll gap between the flat rolls is set to , so that at the beginning of variable thickness rolling, the thickness between the second starting sides of the first rolled piece can be directly rolled to In the process of variable thickness rolling, the flat roller moves in the thickness direction, so that when the flat roller moves to the second stop side of the first rolled piece, the thickness between the second stop sides of the first rolled piece can be rolled to .

[0067] It is worth mentioning that during variable width rolling, the length of the medium and thick plate rolled piece at different positions will change with the metal flow, resulting in changes in the length direction. Therefore, it is necessary to obtain the length of the first rolled piece through the rolling finite element model to ensure the accuracy of variable thickness rolling.

[0068] Furthermore, during the variable thickness rolling process, the distance that the flat roller moves along the thickness direction of the first rolled piece is for , the time for the flat roller to move along the length direction of the first rolled piece for ,in, L 2 is the length of the first rolled piece.

[0069] It can be understood that the time for the flat roller to move along the thickness direction of the first rolled piece is the same as the time for the flat roller to move along the length direction of the first rolled piece.

[0070] Furthermore, the second inward speed of the flat roller moving toward the first rolled piece along the thickness direction of the first rolled piece is for: .

[0071] in, The unit is millimeter per second, mm / s; , , , , The unit is millimeter, mm.

[0072] In this embodiment, the second inward speed of the flat roller can be reasonably adjusted according to the specific rolling requirements in the actual application scenario, so as to ensure the accuracy and stability of the variable thickness rolling process, so that the thickness of the first rolled piece can change in the expected manner and degree, thereby achieving precise variable thickness rolling.

[0073] Step 103, determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first workpiece and the second workpiece.

[0074] Specifically, based on the material properties of the medium and thick plate, when the medium and thick plate is subjected to variable thickness rolling using flat rolls, the width of the medium and thick plate at different positions will also change with the metal flow, resulting in a recovery amount in the width direction, which affects the final width of the medium and thick plate. Here, the change in the width direction of the medium and thick plate before and after variable thickness rolling is taken as the width recovery amount.

[0075] In this embodiment, the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the same position in the rolled piece obtained after variable width rolling and variable thickness rolling are determined, so as to determine the width recovery amount of the medium and thick plate rolled piece after rolling at the vertical roll reduction rate and flat roll reduction rate in the combined rolling process of variable width and variable thickness.

[0076] Specifically, according to the first and second rolled pieces, the reduction rate of the vertical roll at the target position during variable width rolling (i.e., vertical roll reduction rate), the reduction rate of the flat roll at the target position during variable thickness rolling (i.e., flat roll reduction rate), and the recovery amount in the width direction of the medium and thick plate rolled piece at the target position before and after variable thickness rolling (i.e., width recovery amount) are determined. Thus, according to the vertical roll reduction rate, flat roll reduction rate, and width recovery amount corresponding to the target position, the width recovery amount of the medium and thick plate rolled piece after rolling at the vertical roll reduction rate and flat roll reduction rate is determined.

[0077] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point are determined according to the first workpiece and the second workpiece, including: cutting the first workpiece along the width direction of the first workpiece according to the target position point to obtain a first cross-sectional view of the first workpiece; cutting the second workpiece along the width direction of the second workpiece according to the target position point to obtain a second cross-sectional view of the second workpiece; determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first cross-sectional view and the second cross-sectional view.

[0078] In this embodiment, the same position of the medium and thick plate workpiece is accurately located in the first workpiece and the second workpiece by marking the target position point, and the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the position are accurately determined in the form of a cross-sectional diagram, thereby avoiding the influence of interfering factors such as metal flow during the rolling process and providing scientific data support.

[0079] For example, Fig. 9 As shown, the first rolled piece is cut along the width direction of the first rolled piece at the target position point of the first rolled piece to obtain a first cross-sectional view of the first rolled piece, so as to accurately reflect the actual compression of the width of the medium and thick plate rolled piece by the vertical rollers through the first cross-sectional view.

[0080] Similarly, if Fig.10 As shown, the second rolled piece is cut along the width direction of the second rolled piece at the target position point of the second rolled piece to obtain a second cross-sectional view of the second rolled piece, so as to intuitively reflect the change of the thickness of the first rolled piece caused by the flat roller through the second cross-sectional view.

[0081] Therefore, according to the first cross-sectional view and the second cross-sectional view, the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point are determined.

[0082] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point are determined according to the first cross-sectional view and the second cross-sectional view, including: determining the vertical roll reduction rate corresponding to the target position point according to the width of the first cross-sectional view and the initial width of the medium and thick plate rolled piece; determining the flat roll reduction rate corresponding to the target position point according to the thickness of the second cross-sectional view and the initial thickness of the medium and thick plate rolled piece; determining the width recovery amount corresponding to the target position point according to the width of the first cross-sectional view and the width of the second cross-sectional view.

[0083] In this embodiment, the amount of reduction of the vertical rollers on both sides of the medium and thick plate rolled piece at the target position is determined based on the difference between the width of the first cross-sectional view and the initial width of the medium and thick plate rolled piece, thereby determining the reduction rate of the vertical rollers corresponding to the target position during the variable width rolling process based on the ratio of the amount of reduction of the vertical rollers on both sides of the medium and thick plate rolled piece at the target position to the initial width of the medium and thick plate rolled piece.

[0084] Similarly, based on the difference in thickness between the first cross-sectional view and the second cross-sectional view, the amount of reduction of the flat rollers on both sides of the first rolled piece at the target position is determined, and thus based on the ratio of the reduction of the flat rollers on both sides of the first rolled piece at the target position to the thickness of the first cross-sectional view (i.e., the initial thickness of the medium and thick plate rolled piece), the reduction rate of the flat rollers corresponding to the target position during the variable thickness rolling process is determined.

[0085] Furthermore, if Fig. 9 and Fig.10 As shown, according to the width of the first cross-sectional view C 1 The width of the second section C 2 The difference between and is used to determine the width recovery amount of the medium and thick plate rolled piece corresponding to the target position point.

[0086] Step 104, constructing a corresponding relationship between the vertical roll reduction rate, the flat roll reduction rate and the width recovery amount according to the vertical roll reduction rate, the flat roll reduction rate and the width recovery amount corresponding to the target position point.

[0087] In this embodiment, according to the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point, the width recovery amount of the medium and thick plate rolled piece after rolling at different vertical roll reduction rates and flat roll reduction rates in the combined rolling process of variable width and variable thickness is statistically analyzed. By drawing in the drawing software, a three-dimensional relationship diagram of the width recovery amount and the vertical roll and flat roll reduction rates can be obtained. By fitting all the data points, a mathematical model of the relationship between the vertical roll and flat roll reduction rates and the width recovery amount can be obtained. Through this model, the width recovery amount value of the medium and thick plate rolled piece after rolling at other vertical roll and flat roll reduction rates can be better predicted, so that the model can be used to guide the actual combined rolling process of variable width and variable thickness, thereby improving the rolling accuracy.

[0088] Step 105 , according to the corresponding relationship and the finished product size corresponding to the medium and thick plate to be rolled, the medium and thick plate to be rolled is subjected to variable width rolling and variable thickness rolling to obtain a target rolled product.

[0089] In this embodiment, the corresponding relationship is utilized, and according to the finished product size corresponding to the medium and thick plate to be rolled, the vertical roll reduction rate and the flat roll reduction rate combination of the medium and thick plate to be rolled in the variable width and variable thickness combined rolling process are reasonably set. While rolling the target rolled product whose thickness and width continuously change along the length direction, the width of the target rolled product can be closer to the finished product size required by the medium and thick plate to be rolled, thereby improving the rolling accuracy, thereby minimizing the shear amount in the width direction, increasing the utilization rate of the medium and thick plate, and thereby improving the efficiency of actual production.

[0090] It should be noted that the material properties of the medium and thick plate rolled in step 101 and the medium and thick plate to be rolled in step 104 must be consistent to ensure the reliability of variable width rolling and variable thickness rolling.

[0091] In one embodiment, in a finite element analysis system, a variable width and variable thickness two-pass rolling process of a carbon structural steel plate rolled piece is established to obtain a combined rolling model of the carbon structural steel plate rolled piece. The process parameters of variable width rolling and variable thickness rolling in the combined rolling model are shown in Table 1.

[0092] Table 1

[0093] Among them, the push block is a part used to push the metal billet into the gap between the rollers during the metal rolling process. Its function is to ensure that the metal billet maintains the correct position and centering during the rolling process, thereby ensuring the quality and efficiency of rolling. AISI-H-13 is a chromium-molybdenum-vanadium hot work tool steel that meets the ASTM A681 (Standard Specification for Alloy Tool Steel) standard.

[0094] Next, according to the required finished size of the carbon structural steel plate rolled product and the initial size of the carbon structural steel plate rolled product, the vertical roll reduction rate range and the first inward speed in variable width rolling, as well as the flat roll reduction rate range and the second inward speed in variable thickness rolling are set in the combined rolling model.

[0095] Specifically, in this embodiment, the initial width of the carbon structural steel plate rolled piece is 1165 mm, the initial length is 1870 mm, and the initial thickness is 78 mm. The finished product dimensions required for the carbon structural steel plate rolled piece are that the narrowest width of the finished product is 1105 mm, the widest width of the finished product is 1155 mm, the thickness of the thickest end of the finished product is 74 mm, and the thickness of the thinnest end of the finished product is 62 mm.

[0096] For variable width rolling in the combined rolling model, the initial roll gap of the vertical roll is set to 1155mm, the vertical roll reduction rate range is set to 0.8%-5.2%, and the vertical rolls on both sides of the carbon structural steel plate rolling piece have a reduction range of 10mm-60mm on the width of the carbon structural steel plate rolling piece.

[0097] Next, calculate the first linear speed of the neutral roll of the variable width rolling of the carbon structural steel plate rolled piece With the first inward speed , expressed as: , . Further, according to and , the carbon structural steel plate rolled piece is subjected to variable width rolling using vertical rollers, and the measuring position points are marked in the carbon structural steel plate rolled piece after variable width rolling to obtain a marked rolled piece.

[0098] For variable thickness rolling in the combined rolling model, first, obtain the length of the marked workpiece, which is 2100 mm here, and then set the initial roll gap of the flat roll to 74 mm, the flat roll reduction rate range to 5.1%-20.5%, and the flat rolls on both sides of the marked workpiece reduce the thickness of the marked workpiece in the range of 4 mm to 16 mm.

[0099] Next, calculate the second linear speed of the flat roll in the variable thickness rolling of the carbon structural steel plate rolled piece With the second inward speed , expressed as: , . Further, according to and , the marked workpiece is rolled with variable thickness using a flat roller to obtain a target steel plate workpiece, thereby rolling out a carbon structural steel plate whose thickness and width continuously change along the length direction.

[0100] Then, in the post-processing of the finite element analysis system, the marked rolled piece and the target steel plate rolled piece are cut according to the measurement position points to obtain two experimental cross-sectional diagrams, and the width and thickness of the experimental cross-sectional diagrams are accurately measured to obtain the vertical roll reduction rate, flat roll reduction rate and width recovery value corresponding to the measurement position points according to the width and thickness of the two experimental cross-sectional diagrams, thereby obtaining the width recovery value of the carbon structural steel plate rolled piece after being rolled at the vertical roll reduction rate and flat roll reduction rate. By counting the width recovery value of the carbon structural steel plate rolled piece after being rolled at different vertical roll reduction rates and flat roll reduction rates, and drawing in the drawing software, the following can be obtained. Fig.11 The three-dimensional relationship diagram between the width recovery amount and the vertical roll and flat roll reduction rate is shown in FIG. Then, all data points are fitted to obtain the following Fig.12 The fitting surface is shown, and based on the fitting surface, a mathematical model of the width recovery amount of carbon structural steel plate rolled products can be obtained.

[0101] Exemplarily, the process of establishing a mathematical model for the width recovery of a carbon structural steel plate rolled piece is shown in Table 2.

[0102] Table 2

[0103] here, z' is the width recovery amount, x' is the vertical roller reduction rate, y' is the flat roll reduction rate.

[0104] pass Fig.12 It can be seen that the deviation between the fitting surface and the three-dimensional relationship diagram is small. From Table 2, it can be seen that the R square is close to 1, which proves that the fitting result is relatively accurate. At the same time, it proves that the formula It can be used to fit the relationship between different vertical roll reduction rates and flat roll reduction rates and width recovery. For example, the mathematical model of the width recovery of carbon structural steel plate rolled products is expressed as: .

[0105] As shown in Table 3, since the mathematical model of the width recovery of carbon structural steel plate rolled products is relatively accurate, the specific value of the width recovery of carbon structural steel plate rolled products can be calculated by the mathematical model of the width recovery of carbon structural steel plate rolled products given different vertical roll reduction rates and flat roll reduction rates.

[0106] Table 3

[0107] Therefore, the mathematical model of the width recovery of the carbon structural steel plate rolled piece can be used to guide the actual variable width and variable thickness combined rolling process of the carbon structural steel plate, so that the carbon structural steel plate after actual rolling can be closer to the required finished product size of the carbon structural steel plate, improve the rolling accuracy, thereby minimizing the shearing amount, increasing the utilization rate of the carbon structural steel plate, and thus improving the actual production benefits.

[0108] It should be noted that the size of the serial numbers of the steps in the above embodiments does not mean 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 the present application.

[0109] Furthermore, if Fig.13 As shown, as a specific implementation of the above-mentioned medium and thick plate variable width and thickness rolling method, an embodiment of the present application provides a medium and thick plate variable width and thickness rolling device 1300, and the medium and thick plate variable width and thickness rolling device 1300 includes: a simulation module 1301, a determination module 1302 and a rolling module 1303.

[0110] The simulation module 1301 is used to construct a rolling finite element model of a medium and thick plate rolled piece; and in the rolling finite element model, the medium and thick plate rolled piece is subjected to variable width rolling by using a vertical roll, and a target position point is marked in the medium and thick plate rolled piece after the variable width rolling to obtain a first rolled piece, and the first rolled piece is subjected to variable thickness rolling by using a flat roll to obtain a second rolled piece; The determination module 1302 is used to determine the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; and to establish a corresponding relationship between the vertical roll reduction rate and the flat roll reduction rate and the width recovery amount according to the vertical roll reduction rate, flat roll reduction rate and the width recovery amount corresponding to the target position point; The rolling module 1303 is used to perform variable width rolling and variable thickness rolling on the medium and thick plates to be rolled according to the corresponding relationship and the finished product size corresponding to the medium and thick plates to obtain the target rolled products.

[0111] In one embodiment, the simulation module 1301 is specifically used to obtain the range of the vertical roller reduction rate; determine the first inward speed of the vertical roller according to the initial width of the medium and thick plate rolled piece and the range of the vertical roller reduction rate, and determine the first linear speed of the vertical roller; according to the first inward speed and the first linear speed, use the vertical roller to perform variable width rolling on the medium and thick plate rolled piece, so that the vertical roller moves from the first starting side of the medium and thick plate rolled piece along the length direction of the medium and thick plate rolled piece at the first linear speed to the first stopping side of the medium and thick plate rolled piece, and the vertical roller moves from the first starting side of the medium and thick plate rolled piece along the width direction of the medium and thick plate rolled piece at the first inward speed toward the medium and thick plate rolled piece, and the first starting side and the first stopping side are determined according to the length direction and the width direction of the medium and thick plate rolled piece.

[0112] In one embodiment, the simulation module 1301 is specifically used to determine the second target width between the first starting side and the first target width between the first stopping side according to the initial width of the medium and thick plate rolled product and the reduction rate range of the vertical roll; determine the first inward speed according to the first target width, the second target width, the initial length of the medium and thick plate, and the radius and rotation speed of the vertical roll.

[0113] In one embodiment, the simulation module 1301 is specifically used to obtain the flat roll reduction rate range; determine the second inward speed of the flat roll and the second linear speed of the flat roll according to the initial thickness of the medium and thick plate workpiece and the flat roll reduction rate range; according to the second inward speed and the second linear speed, use the flat roll to perform variable thickness rolling on the first workpiece, so that the flat roll moves from the second starting side of the first workpiece along the length direction of the first workpiece at the second linear speed to the second stopping side of the first workpiece, and the flat roll moves from the second starting side of the first workpiece along the thickness direction of the first workpiece at the second inward speed toward the first workpiece, and the second starting side and the second stopping side are determined according to the length direction and the thickness direction of the first workpiece.

[0114] In one embodiment, the simulation module 1301 is specifically used to determine the second target thickness between the second starting side and the first target thickness between the second stopping side based on the initial thickness of the medium and thick plate rolled piece and the range of the flat roll reduction rate; and determine the second inward speed based on the first target thickness, the second target thickness, the length of the first rolled piece, and the radius and rotation speed of the flat roll.

[0115] In one embodiment, the determination module 1302 is specifically used to cut the first workpiece along the width direction of the first workpiece according to the target position point to obtain a first cross-sectional view of the first workpiece; cut the second workpiece along the width direction of the second workpiece according to the target position point to obtain a second cross-sectional view of the second workpiece; determine the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first cross-sectional view and the second cross-sectional view.

[0116] In one embodiment, the determination module 1302 is specifically used to determine the vertical roll reduction rate corresponding to the target position point based on the width of the first cross-sectional view and the initial width of the medium and thick plate rolled product; determine the flat roll reduction rate corresponding to the target position point based on the thickness of the second cross-sectional view and the initial thickness of the medium and thick plate rolled product; determine the width recovery amount corresponding to the target position point based on the width of the first cross-sectional view and the width of the second cross-sectional view.

[0117] The specific definition of the medium and thick plate variable width and variable thickness rolling device can be found in the above definition of the medium and thick plate variable width and variable thickness rolling method, which will not be repeated here. Each module in the above medium and thick plate variable width and variable thickness rolling device can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0118] Based on the above Figure 1 The method shown, accordingly, an embodiment of the present application also provides a readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the above-mentioned medium and thick plate variable width and variable thickness rolling method as shown in the figure.

[0119] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0120] Based on the above Figure 1 The method shown, and Fig.13In order to achieve the above-mentioned purpose, the embodiment of the present application further provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 The method for rolling medium and thick plates with variable width and thickness is shown.

[0121] Optionally, the computer device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a Bluetooth interface, a WI-FI interface), etc.

[0122] Those skilled in the art will appreciate that the computer device structure provided in this embodiment does not limit the computer device, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0123] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages and saves the hardware and software resources of the computer device, and supports the operation of information processing programs and other software and / or programs. The network communication module is used to realize communication between the components inside the storage medium, and communication with other hardware and software in the physical device.

[0124] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or the embodiments of the present application can be implemented by hardware.

[0125] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0126] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A method for rolling medium and thick plates with variable width and thickness, characterized in that: The method comprises: Construct the rolling finite element model of medium and thick plate rolled products; In the rolling finite element model, the medium and thick plate rolled piece is subjected to variable width rolling by using vertical rolls, and a target position point is marked in the medium and thick plate rolled piece after the variable width rolling to obtain a first rolled piece, and the first rolled piece is subjected to variable thickness rolling by using flat rolls to obtain a second rolled piece; Determine the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; According to the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point, a corresponding relationship between the vertical roll reduction rate and flat roll reduction rate and the width recovery amount is established; According to the corresponding relationship and the finished product size corresponding to the medium and thick plate to be rolled, the medium and thick plate to be rolled is subjected to variable width rolling and variable thickness rolling to obtain a target rolled piece.

2. The method for rolling medium and thick plates with variable width and thickness according to claim 1, characterized in that: The method of using vertical rollers to perform variable width rolling on the medium and thick plate rolled piece comprises: Get the vertical roller reduction rate range; Determine the first inward speed of the vertical roll and the first linear speed of the vertical roll according to the initial width of the medium and thick plate rolled piece and the range of the vertical roll reduction rate; According to the first inward speed and the first linear speed, the medium and thick plate rolled piece is subjected to variable width rolling using the vertical rollers, so that the vertical rollers move from the first starting side of the medium and thick plate rolled piece along the length direction of the medium and thick plate rolled piece at the first linear speed toward the first stopping side of the medium and thick plate rolled piece, and the vertical rollers move from the first starting side of the medium and thick plate rolled piece along the width direction of the medium and thick plate rolled piece at the first inward speed toward the medium and thick plate rolled piece, and the first starting side and the first stopping side are determined according to the length direction and the width direction of the medium and thick plate rolled piece.

3. The method for rolling medium and thick plates with variable width and thickness according to claim 2, characterized in that: Determining the first inward speed of the vertical roll according to the initial width of the medium and thick plate rolled piece and the reduction rate range of the vertical roll comprises: Determining a second target width between the first starting sides and a first target width between the first stopping sides according to the initial width of the plate rolled piece and the reduction rate range of the vertical rolls; The first inward speed is determined according to the first target width, the second target width, the initial length of the medium and thick plate, and the radius and rotation speed of the vertical roll.

4. The method for rolling medium and thick plates with variable width and thickness according to claim 1, characterized in that: The step of using a flat roll to perform variable thickness rolling on the first rolled piece comprises: Get the flat roll reduction rate range; Determining a second inward speed of the flat roll and a second linear speed of the flat roll according to the initial thickness of the medium and thick plate rolled piece and the range of the flat roll reduction rate; According to the second inward speed and the second linear speed, the first workpiece is rolled with variable thickness using the flat roller, so that the flat roller moves from the second starting side of the first workpiece along the length direction of the first workpiece to the second stopping side of the first workpiece at the second linear speed, and the flat roller moves from the second starting side of the first workpiece along the thickness direction of the first workpiece at the second inward speed toward the first workpiece, and the second starting side and the second stopping side are determined according to the length direction and the thickness direction of the first workpiece.

5. The method for rolling medium and thick plates with variable width and thickness according to claim 4, characterized in that: The step of determining the second inward speed of the flat roll according to the initial thickness of the medium and thick plate rolled piece and the flat roll reduction rate range comprises: Determining a second target thickness between the second starting side and a first target thickness between the second stopping side according to the initial thickness of the medium and thick plate rolled piece and the flat roll reduction rate range; The second inward speed is determined according to the first target thickness, the second target thickness, the length of the first rolled piece, and the radius and rotation speed of the flat roll.

6. The method for rolling medium and thick plates with variable width and thickness according to claim 1, characterized in that: Determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece includes: Cutting the first rolled piece along the width direction of the first rolled piece according to the target position point to obtain a first cross-sectional view of the first rolled piece; cutting the second rolled piece along the width direction of the second rolled piece according to the target position point to obtain a second cross-sectional view of the second rolled piece; According to the first cross-sectional view and the second cross-sectional view, the vertical roll reduction rate, the flat roll reduction rate and the width recovery amount corresponding to the target position point are determined.

7. The method for rolling medium and thick plates with variable width and thickness according to claim 6, characterized in that: Determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first cross-sectional view and the second cross-sectional view includes: Determining the vertical roll reduction rate corresponding to the target position point according to the width of the first cross-sectional view and the initial width of the medium and thick plate rolled piece; Determining the flat roll reduction rate corresponding to the target position point according to the thickness of the second cross-sectional view and the initial thickness of the medium and thick plate rolled piece; A width restoration amount corresponding to the target position point is determined according to the width of the first cross-sectional view and the width of the second cross-sectional view.

8. A rolling device for medium and thick plates with variable width and thickness, characterized in that: The device comprises: A simulation module for building a finite element model of the rolling of medium and heavy plate products; and In the rolling finite element model, the medium and thick plate rolled piece is subjected to variable width rolling by using vertical rolls, and a target position point is marked in the medium and thick plate rolled piece after the variable width rolling to obtain a first rolled piece, and the first rolled piece is subjected to variable thickness rolling by using flat rolls to obtain a second rolled piece; A determination module, used for determining the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; and According to the vertical roll reduction rate, flat roll reduction rate and width recovery amount corresponding to the target position point, a corresponding relationship between the vertical roll reduction rate and flat roll reduction rate and the width recovery amount is established; The rolling module is used to perform variable width rolling and variable thickness rolling on the medium and thick plate to be rolled according to the corresponding relationship and the finished product size corresponding to the medium and thick plate to be rolled, so as to obtain the target rolled product.

9. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by a processor, the steps of the method for rolling medium and thick plates with variable width and thickness as claimed in any one of claims 1 to 7 are implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and running on the processor, characterized in that: When the processor executes the program, the method for rolling medium and thick plates with variable width and thickness as described in any one of claims 1 to 7 is implemented.

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