Rolling method, device, medium and equipment for medium plate with variable width and variable thickness

Abstract

The present application relates to the field of rolling technology, and discloses a rolling method, device, medium and equipment for medium-thick plates with variable width and variable thickness. The method of the present application uses vertical rolls and horizontal rolls to perform variable-width rolling and variable-thickness rolling on the medium-thick plate in sequence, and can roll a medium-thick plate whose width and thickness can continuously vary along the length direction. Moreover, by simulating the combined rolling process of variable width and variable thickness through a finite element model, a corresponding relationship between the reduction rate of the vertical roll and the reduction rate of the horizontal roll and the width recovery amount of the medium-thick plate during variable-thickness rolling is established, so as to improve the accuracy of the combined rolling, reduce the shearing amount, and improve the utilization rate of the medium-thick plate.

Description

Technical Field

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

[0002] As an important steel product, medium plate is widely used in large structures such as wind power tower barrels. Based on the structural performance and engineering requirements of wind power tower barrels, in addition to the thickness of the medium plate for wind power tower barrels needing to continuously change along the length direction, the width also needs to gradually narrow along the length direction to form a wedge shape.

[0003] In related technologies, LP steel plates (longitudinally profiled plates) are used as steel for wind power tower barrels. LP steel plates are medium plates with continuously changing thickness along the longitudinal direction. To meet the width change requirements, in related technologies, LP steel plates or originally equal-width medium plates are also sheared to achieve the effect of width change. However, the shearing amount is large, which will reduce the utilization rate of the medium plate and affect the production efficiency. Summary of the Invention

[0004] In view of this, the present application provides a rolling method, device, medium and equipment for variable width and variable thickness of medium plate. By using vertical rolls and horizontal rolls, variable width rolling and variable thickness rolling are sequentially performed on the medium plate to roll out a medium plate whose width and thickness can continuously change along the length direction. Moreover, through finite element model simulation of the combined rolling process of variable width and variable thickness, the corresponding relationship between the reduction rate of the vertical roll, the reduction rate of the horizontal roll and the width recovery amount of the medium plate during variable thickness rolling is constructed, so as to improve the accuracy of the combined rolling, reduce the shearing amount and improve the utilization rate of the medium plate by using the corresponding relationship.

[0005] According to one aspect of the present application, a rolling method for variable width and variable thickness of medium plate is provided, including:

[0006] Construct a rolling finite element model of the medium plate workpiece;

[0007] In the rolling finite element model, use vertical rolls to perform variable width rolling on the medium plate workpiece, and mark the target position points in the medium plate workpiece after variable width rolling to obtain the first workpiece, and use horizontal rolls to perform variable thickness rolling on the first workpiece to obtain the second workpiece;

[0008] According to the first workpiece and the second workpiece, determine the reduction rate of the vertical roll, the reduction rate of the horizontal roll and the width recovery amount corresponding to the target position points;

[0009] Construct a corresponding relationship between the vertical roll reduction rate, the horizontal roll reduction rate and the width recovery amount corresponding to the target position point;

[0010] Perform variable-width rolling and variable-thickness rolling on the to-be-rolled medium plate according to the corresponding relationship and the finished product dimensions corresponding to the to-be-rolled medium plate to obtain a target rolled piece.

[0011] According to another aspect of the present application, there is provided a rolling device for variable-width and variable-thickness of medium plates, including:

[0012] A simulation module, configured to construct a rolling finite element model of a medium plate rolled piece; and, in the rolling finite element model, perform variable-width rolling on the medium plate rolled piece by using vertical rolls, and mark a target position point in the medium plate rolled piece after variable-width rolling to obtain a first rolled piece, and perform variable-thickness rolling on the first rolled piece by using horizontal rolls to obtain a second rolled piece;

[0013] A determination module, configured to determine the vertical roll reduction rate, the horizontal roll reduction rate and the width recovery amount corresponding to the target position point according to the first rolled piece and the second rolled piece; and, construct a corresponding relationship between the vertical roll reduction rate, the horizontal roll reduction rate and the width recovery amount according to the vertical roll reduction rate, the horizontal roll reduction rate and the width recovery amount corresponding to the target position point;

[0014] A rolling module, configured to perform variable-width rolling and variable-thickness rolling on the to-be-rolled medium plate according to the corresponding relationship and the finished product dimensions corresponding to the to-be-rolled medium plate to obtain a target rolled piece.

[0015] According to yet another aspect of the present application, there is provided a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the above-mentioned rolling method for variable-width and variable-thickness of medium plates are implemented.

[0016] According to still another aspect of the present application, there is provided a computer device, 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 rolling method for variable-width and variable-thickness of medium plates are implemented.

[0017] With the above technical solutions, the present application provides a rolling method, device, medium and equipment for medium-thick plates with variable width and variable thickness. First, vertical rolls are used to roll the medium-thick plate to change the width of the medium-thick plate, and the roll gap between the vertical rolls is continuously changed so that the width of the medium-thick plate can continuously change along the length direction to achieve variable-width rolling. Then, flat rolls are used to roll the medium-thick plate after variable-width rolling to change the thickness of the medium-thick plate after variable-width rolling, and the roll gap between the flat rolls is continuously changed so that the thickness of the medium-thick plate after variable-width rolling can continuously change along the length direction to achieve variable-thickness rolling, thereby rolling a medium-thick plate whose width and thickness can both continuously change along the length direction. Moreover, the present application simulates the combined rolling process of variable width and variable thickness through a finite element model, and establishes the corresponding relationship between the reduction rate of the vertical roll and the reduction rate of the flat roll and the recovery amount in the width direction generated when the medium-thick plate undergoes variable-thickness rolling, so as to accurately predict the width recovery amount of the medium-thick plate after rolling with different reduction rates of the vertical roll and the flat roll during the combined rolling process. Thus, according to the corresponding relationship, the combination of the reduction rate of the vertical roll and the reduction rate of the flat roll in the actual combined rolling process is reasonably set, so that the width of the medium-thick plate after actual combined rolling can be closer to the required finished product size, improving the rolling accuracy, thereby minimizing the shearing amount in the width direction of the medium-thick plate as much as possible, increasing the utilization rate of the medium-thick plate, and further enhancing the efficiency of actual production.

[0018] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Brief Description of the Drawings

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0020] Figure 1 The flowchart showing the rolling method for medium-thick plates with variable width and variable thickness provided by the embodiment of the present application is shown;

[0021] Figure 2 The structural schematic diagram showing variable-width rolling provided by the embodiment of the present application is shown;

[0022] Figure 3 The structural schematic diagram showing variable-thickness rolling provided by the embodiment of the present application is shown;

[0023] Figure 4 The medium-thick plate provided by the embodiment of the present application with width and thickness continuously changing along the length direction is shown;

[0024] Figure 5 The top view of variable-width rolling provided by the embodiment of the present application is shown;

[0025] Figure 6 The top view of the medium-thick plate workpiece after variable-width rolling provided by the embodiment of the present application is shown;

[0026] Figure 7 The side view of variable-thickness rolling provided by the embodiment of the present application is shown;

[0027] Figure 8 The side view of the second workpiece provided by the embodiment of the present application is shown;

[0028] Figure 9 The first sectional view provided by the embodiment of the present application is shown;

[0029] Figure 10 The second sectional view provided by the embodiment of the present application is shown;

[0030] Figure 11 The three-dimensional relationship diagram of the width recovery amount and the reduction ratios of the vertical roll and the flat roll provided by the embodiment of the present application is shown;

[0031] Figure 12 The fitted surface provided by the embodiment of the present application is shown;

[0032] Figure 13 The structural block diagram of the rolling device for variable width and variable thickness of the medium-thick plate provided by the embodiment of the present application is shown. Detailed implementation manners

[0033] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0034] The embodiments of the present application are described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as a limitation of the present application.

[0035] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of 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 their groups. It should be understood that when we say an element is "connected" or "joined" to another element, it can be directly connected or joined to other elements, or there may also be intermediate elements. In addition, the "connection" or "joining" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more of the associated listed items.

[0036] 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 many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art.

[0037] In this embodiment, a rolling method for medium-thick plates with variable width and variable thickness is provided, as Figure 1 shown, the method includes:

[0038] Step 101, constructing a rolling finite element model of the medium-thick plate workpiece.

[0039] In this embodiment, by simulating the two-pass rolling processes of variable-width rolling and variable-thickness rolling through the finite element model, physical experiments are replaced to provide accurate data for subsequent steps.

[0040] Specifically, the medium-thick plate that needs to change its width and thickness in the actual application scenario is used as the workpiece for combined rolling of variable width and variable thickness to obtain the medium-thick plate workpiece. According to the initial dimensions and material properties of the medium-thick plate workpiece, a rolling finite element model of the medium-thick plate workpiece is established to simulate phenomena such as the movement of the rolling rolls, the change in the reduction of the rolling rolls, and the metal flow behavior in the medium-thick plate during the actual combined rolling process in the rolling finite element model.

[0041] Here, the initial dimensions of the medium-thick plate workpiece may include the initial length, initial width, and initial thickness of the medium-thick plate workpiece.

[0042] It should be noted that the medium-thick plate is a flat steel with a relatively large width-thickness ratio and surface area, and is a steel plate with a regular shape. The rolling process is a process in which the friction between the workpiece and the rolling rolls pulls the workpiece into the rolling rolls rotating in different directions to cause plastic deformation.

[0043] In step 102, in the rolling finite element model, the vertical rolls are used to perform variable-width rolling on the medium and heavy plate workpiece, and target position points are marked in the medium and heavy plate workpiece after variable-width rolling to obtain the first workpiece. Then, the flat rolls are used to perform variable-thickness rolling on the first workpiece to obtain the second workpiece.

[0044] In this embodiment, first, variable-width rolling is performed on the medium and heavy plate workpiece in the rolling finite element model.

[0045] Specifically, as Figure 2 shown, a first limiting device 203 is provided at one end of the medium and heavy plate workpiece 202 in the length direction to prevent the medium and heavy plate workpiece 202 from shifting during rolling, so as to ensure the stability of the rolling process. A vertical roll 201 is provided at the end of the medium and heavy plate workpiece 202 in the length direction away from the first limiting device 203, and the vertical roll 201 is symmetrically arranged on both sides of the medium and heavy plate workpiece 202 in the width direction. These two sides are used as the first starting sides of the medium and heavy plate workpiece 202, and the two sides symmetrical to the connection between the medium and heavy plate workpiece 202 and the first limiting device 203 in the width direction of the medium and heavy plate workpiece 202 are used as the first stopping sides of the medium and heavy plate workpiece 202.

[0046] Here, the length direction of the vertical roll is parallel to the thickness direction of the medium and heavy plate workpiece, and the roll body length of the vertical roll is greater than the thickness of the medium and heavy plate workpiece to ensure that an effective pressure can be continuously applied to the width direction of the medium and heavy plate workpiece during variable-width rolling.

[0047] Furthermore, the vertical rolls are used to perform variable-width rolling on the medium and heavy plate workpiece, so that the vertical rolls move from the first starting side of the medium and heavy plate workpiece along the length direction of the medium and heavy plate workpiece to the first stopping side, and the vertical rolls are used to roll the medium and heavy plate workpiece to change the width of the medium and heavy plate. At the same time, the roll gap between the vertical rolls is continuously changed so that the width of the medium and heavy plate workpiece can change continuously along the length direction, thereby realizing variable-width rolling of the medium and heavy plate workpiece.

[0048] Moreover, a finite number of target position points are marked in the medium and heavy plate workpiece after variable-width rolling, and the marked medium and heavy plate workpiece is used as the first workpiece, so as to accurately locate the same position in the second workpiece obtained by variable-thickness rolling through the marked target position points, thereby clarifying the width direction recovery amount of the same position in the medium and heavy plate workpiece before and after variable-thickness rolling.

[0049] It should be noted that the target position points are selected at the stable rolling part in the middle section of the medium and heavy plate workpiece after variable-width rolling to prevent errors.

[0050] Then, variable-thickness rolling is performed on the first workpiece in the rolling finite element model.

[0051] Specifically, as Figure 3As shown, a second limiting device 303 is provided at the narrower end of the first rolled piece 302 in the length direction to prevent the first rolled piece 302 from shifting during rolling, so as to ensure the stability of the rolling process. A flat roll 301 is provided at the wider end of the first rolled piece 302 in the length direction, and the flat roll 301 is symmetrically arranged on both sides of the first rolled piece 302 in the thickness direction. These two sides are used as the second starting sides of the first rolled piece 302, and the two sides symmetric to the connection between the first rolled piece 302 and the second limiting device 303 in the thickness direction of the first rolled piece 302 are used as the second stopping sides of the first rolled piece 302.

[0052] Here, the length direction of the flat roll is parallel to the width direction of the first rolled piece, and the roll body length of the flat roll is greater than the width of the first rolled piece to ensure that an effective pressure can be continuously applied to the first rolled piece in the thickness direction during the variable-thickness rolling process.

[0053] Furthermore, the flat roll is used to perform variable-thickness rolling on the first rolled piece, so that the flat roll moves from the second starting side of the first rolled piece along the length direction of the first rolled piece to the second stopping side, so as to use the flat roll to roll the first rolled piece and change the thickness of the first rolled piece. At the same time, the roll gap between the flat rolls is continuously changed so that the thickness of the first rolled piece can change continuously along the length direction, thereby realizing variable-thickness rolling of the first rolled piece to obtain a second rolled piece. Furthermore, through a combined rolling method of variable width and variable thickness, a medium-thick plate whose width and thickness can both change continuously along the length direction is rolled (as Figure 4 shown).

[0054] Among them, Figure 2 , Figure 3 , Figure 9 and Figure 10 in x, y, z in Figure 10 are the three axes of a 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. In this application, the spatial dimensions of the medium-thick plate rolled piece, the first rolled piece, and the second rolled piece are described through these three dimensions.

[0055] In an actual application scenario, the rolling mill for 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 loaded conditions. In this embodiment, a finite element model is used to better simulate the process of complex forming of the medium-thick plate and reduce the number of experiments.

[0056] It should be noted that the roll gap refers to the gap between two rolling rolls during the rolling process.

[0057] Further, as a refinement and extension of the specific implementation manner of the above embodiment, in order to completely illustrate the specific implementation process of this embodiment, the vertical rolls are used to perform variable-width rolling on the medium-thick plate workpiece, including: obtaining the vertical roll reduction rate range; determining the first inward speed of the vertical rolls and the first linear speed of the vertical rolls according to the initial width of the medium-thick plate workpiece and the vertical roll reduction rate range; performing variable-width rolling on the medium-thick plate workpiece by using the first inward speed and the first linear speed, so that the vertical rolls move from the first starting side of the medium-thick plate workpiece along the length direction of the medium-thick plate workpiece to the first stopping side at the first linear speed, and the vertical rolls move from the first starting side of the medium-thick plate workpiece along the width direction of the medium-thick plate workpiece to the medium-thick plate workpiece at the first inward speed.

[0058] Among them, the first starting side and the first stopping side are determined according to the length direction and the width direction of the medium-thick plate workpiece.

[0059] In this embodiment, when performing variable-width rolling on the medium-thick plate workpiece, while making the vertical rolls move along the length direction of the medium-thick plate workpiece, a first inward speed along the width direction of the medium-thick plate workpiece is set for the vertical rolls, so that the vertical rolls move uniformly along the width direction of the medium-thick plate workpiece to the medium-thick plate workpiece at the first inward speed, thereby realizing continuous change of the roll gap between the vertical rolls. Moreover, the first inward speed of the vertical rolls can be used to accurately adjust the continuous change of the width of the medium-thick plate workpiece along the length direction, and improve the rolling accuracy in the width direction.

[0060] Exemplarily, the first linear speed of the vertical rolls along the length direction of the medium-thick plate workpiece is determined according to the rotational speed and radius of the vertical rolls v '(mm / s, millimeters per second), expressed as: . Wherein, R1 is the radius of the vertical roll, in mm (millimeters); n1 is the rotational speed of the vertical roll, in r / min (revolutions per minute). Here, the rotational speed and radius of the vertical rolls can be preset in the rolling finite element model according to the common parameters of the vertical rolls in the actual application scenario.

[0061] Further, obtain the vertical roll reduction rate range.

[0062] It should be noted that the vertical roll reduction rate described in this application is the ratio of the change amount (or reduction amount) of the width of the workpiece by the vertical rolls on both sides of the workpiece to the original width of the workpiece, so as to quantify the change of the workpiece width caused by the vertical rolls through the vertical roll reduction rate.

[0063] Here, the vertical roll reduction rate range in variable-width rolling can be set according to the common vertical roll reduction rate in the actual application scenario to improve the versatility of variable-width rolling. For example, the vertical roll reduction rate range is 0.8% - 5.2%.

[0064] Therefore, according to the edger roll reduction range and the initial width of the medium and heavy plate workpiece, the range of the change in the width of the medium and heavy plate workpiece is determined, that is, the range of the reduction amount of the width of the medium and heavy plate workpiece by the edger rolls on both sides of the medium and heavy plate workpiece. Furthermore, according to the range of the reduction amount of the width of the medium and heavy plate workpiece by the edger rolls on both sides of the medium and heavy plate workpiece, the first inward speed of the edger rolls is determined.

[0065] Then, as Figure 5 shown, Figure 5 The 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 edger rolls are used to perform variable-width rolling on the medium and heavy plate workpiece, so that the edger rolls move from the first starting side of the medium and heavy plate workpiece along the length direction of the medium and heavy plate workpiece to the first stopping side of the medium and heavy plate workpiece at the first linear speed to change the width of the medium and heavy plate workpiece. At the same time, the edger rolls move from the first starting side of the medium and heavy plate workpiece along the width direction of the medium and heavy plate workpiece to the medium and heavy plate workpiece at the first inward speed, realizing continuous change of the roll gap between the edger rolls, so that the width of the medium and heavy plate workpiece changes continuously along the length direction.

[0066] Furthermore, as a refinement and extension of the specific implementation manner of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, determining the first inward speed of the edger rolls according to the initial width of the medium and heavy plate workpiece and the edger roll reduction range includes: determining the second target width between the first starting sides and the first target width between the first stopping sides according to the initial width of the medium and heavy plate workpiece and the edger roll reduction range; determining the first inward speed according to the first target width, the second target width, the initial length of the medium and heavy plate, and the radius and rotation speed of the edger rolls.

[0067] Exemplarily, as Figure 6 shown, assuming that the initial width of the medium and heavy plate workpiece is W , and the edger roll reduction range is m % - n %, then the range of the reduction amount of the width of the medium and heavy plate workpiece by the edger rolls on both sides of the medium and heavy plate workpiece is a - b , where . Further, it can be obtained that the widest end width (i.e., the second target width) of the medium and heavy plate workpiece after variable-width rolling is , and the narrowest end width (i.e., the first target width) of the medium and heavy plate workpiece after variable-width rolling is .

[0068] In the actual application scenario, and can be determined according to the required finished product dimensions of the medium and heavy plate workpiece.

[0069] It should be noted that, in order to perform variable-width rolling on medium and heavy plate rolling pieces according to the range of vertical roll reduction rates, 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 heavy plate rolling pieces can be directly rolled into . Furthermore, during the process of variable-width rolling, through the movement of the vertical rolls in the width direction, when the vertical rolls move to the first stop side of the medium and heavy plate rolling pieces, the width between the first stop sides of the medium and heavy plate rolling pieces can be rolled into .

[0070] Furthermore, during the process of variable-width rolling, the distance that the vertical rolls move in the width direction of the medium and heavy plate rolling pieces is , and the time that the vertical rolls move in the length direction of the medium and heavy plate rolling pieces is , where L 1 is the initial length of the medium and heavy plate rolling piece.

[0071] It can be understood that the time for the vertical rolls to move in the width direction of the medium and heavy plate rolling pieces is the same as the time for the vertical rolls to move in the length direction of the medium and heavy plate rolling pieces.

[0072] Furthermore, the first inward speed at which the vertical rolls move towards the medium and heavy plate rolling pieces in the width direction of the medium and heavy plate rolling pieces is: .

[0073] Among them, has the unit of millimeters per second, mm / s; , , L 1, a , b all have the unit of millimeters, mm.

[0074] In this embodiment, the first inward speed of the vertical rolls 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, enable the width of the medium and heavy plate rolling pieces to change in the expected manner and degree, and achieve precise variable-width rolling.

[0075] Further, as a refinement and extension of the specific implementation manner of the above embodiment, in order to completely illustrate the specific implementation process of this embodiment, using a flat roll to perform variable-thickness rolling on a first rolled piece includes: obtaining a 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 plate rolled piece and the flat roll reduction rate range; using the flat roll to perform variable-thickness rolling on the first rolled piece according to the second inward speed and the second linear speed, so that the flat roll moves from a second starting side of the first rolled piece along the length direction of the first rolled piece to a second stopping side of the first rolled piece at the second linear speed, and the flat roll moves from the second starting side of the first rolled piece to the first rolled piece along the thickness direction of the first rolled piece at the second inward speed.

[0076] Wherein, 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.

[0077] In this embodiment, when performing variable-thickness rolling on the first rolled piece, while making the flat roll move along the length direction of the first rolled piece, a second inward speed along the thickness direction of the first rolled piece is set for the flat roll, so that the flat roll moves uniformly towards the first rolled piece along the thickness direction of the first rolled piece at the second inward speed, thereby realizing continuous change of the roll gap between the flat rolls. And the second inward speed of the flat roll can be used to accurately adjust the continuous change of the thickness of the first rolled piece along the length direction, improving the rolling accuracy in the thickness direction.

[0078] Exemplarily, the second linear speed of the flat roll along the length direction of the first rolled piece is determined according to the rotational speed and radius of the flat roll (mm / s), expressed as: . Wherein, R 2 is the radius of the flat roll, mm; n 2 is the rotational speed of the flat roll, r / min. Here, the rotational speed and radius of the flat roll can be preset in the rolling finite element model according to the common parameters of the flat roll in the actual application scenario.

[0079] Further, obtain the flat roll reduction rate range.

[0080] It should be noted that the flat roll reduction rate described in this application is the ratio of the change amount (or reduction amount) of the thickness of the rolled piece by the flat rolls on both sides of the rolled piece to the original thickness of the rolled piece, so as to quantify the change of the thickness of the rolled piece caused by the flat rolls through the flat roll reduction rate.

[0081] Here, the flat roll reduction rate range in the variable-thickness rolling can be set according to the commonly used flat roll reduction rate in the actual application scenario, improving the versatility of the variable-thickness rolling. For example, the flat roll reduction rate range is 5.1% - 20.5%.

[0082] Thus, according to the flat roll reduction rate range and the thickness of the first rolled piece, the range of the change in the thickness of the first rolled piece is determined, that is, the range of the reduction amount of the flat rolls on both sides of the first rolled piece with respect to the thickness of the first rolled piece. Furthermore, according to the range of the reduction amount of the flat rolls on both sides of the first rolled piece with respect to the thickness of the first rolled piece, the second inward speed of the flat rolls is determined.

[0083] It should be noted that in this embodiment, the influence of variable-width rolling on the thickness of the medium-thick plate rolled piece is ignored, and the thickness of the first rolled piece is approximately equal to the initial thickness of the medium-thick plate rolled piece.

[0084] Then, as Figure 7 shown, Figure 7 The 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 flat rolls are used to perform variable-thickness rolling on the first rolled piece, so that the flat rolls move from the second starting side of the first rolled piece along the length direction of the first rolled piece at the second linear speed to the second stopping side of the first rolled piece to change the thickness of the first rolled piece. At the same time, the flat rolls move from the second starting side of the first rolled piece along the thickness direction of the first rolled piece at the second inward speed towards the first rolled piece, realizing continuous change of the roll gap between the flat rolls, so that the thickness of the first rolled piece changes continuously along the length direction.

[0085] Furthermore, as a refinement and extension of the specific implementation manner of the above embodiment, in order to completely illustrate the specific implementation process of this embodiment, determining the second inward speed of the flat rolls according to the initial thickness of the medium-thick plate rolled piece and the flat roll reduction rate range includes: determining the second target thickness between the second starting sides and the first target thickness between the second stopping sides according to the initial thickness of the medium-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 rolls.

[0086] Exemplarily, as Figure 8 shown, assuming that the thickness of the first rolled piece (i.e., the initial thickness of the medium-thick plate rolled piece) is H , and the flat roll reduction rate range is p % - q %, then the range of the reduction amount of the flat rolls on both sides of the first rolled piece with respect to the thickness of the first rolled piece is c - d , where . Further, it can be obtained that the thickness of the thickest end of the first rolled piece (i.e., the second rolled piece) after variable-thickness rolling (i.e., the second target thickness) is , and the thickness of the thinnest end of the first rolled piece after variable-thickness rolling (i.e., the first target thickness) is .

[0087] In actual application scenarios, it can be determined according to the required finished product size of the medium and heavy plate rolling piece and 。

[0088] It should be noted that, in order to perform variable thickness rolling on the first rolling piece according to the flat roll reduction rate range, before the variable thickness rolling, the initial roll gap between the flat rolls is set to so that at the beginning of the variable thickness rolling, the thickness between the second starting sides of the first rolling piece can be directly rolled to 。Furthermore, during the variable thickness rolling process, through the movement of the flat rolls in the thickness direction, when the flat rolls move to the second stop side of the first rolling piece, the thickness between the second stop sides of the first rolling piece can be rolled to 。

[0089] It is worth mentioning that during the variable width rolling, the lengths of different positions of the medium and heavy plate rolling piece will change with the metal flow, generating a change amount in the length direction. Therefore, it is necessary to obtain the length of the first rolling piece through the rolling finite element model to ensure the accuracy of the variable thickness rolling.

[0090] Furthermore, during the variable thickness rolling process, the distance that the flat rolls move in the thickness direction of the first rolling piece is ,and the time that the flat rolls move in the length direction of the first rolling piece L is

[0091] wherein,

[0092] Furthermore, the second inward speed at which the flat rolls move towards the first rolling piece in the thickness direction of the first rolling piece is

[0093] wherein, The unit of 、 、 、 、 is millimeter per second, mm / s;

[0094] In this embodiment, according to the specific rolling requirements in the actual application scenario, the second inward speed of the flat rolls can be reasonably adjusted, so as to ensure the accuracy and stability of the variable thickness rolling process, enable the thickness of the first rolling piece to change in the expected manner and degree, and achieve precise variable thickness rolling.

[0095] Step 103: Determine the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point based on the first rolled piece and the second rolled piece.

[0096] Specifically, based on the material properties of the medium-thick plate, when the medium-thick plate is subjected to variable-thickness rolling using horizontal rolls, the width of different positions of the medium-thick plate will also change with the metal flow, generating a recovery amount in the width direction, which affects the final width of the medium-thick plate. Here, the change amount in the width direction of the medium-thick plate before and after variable-thickness rolling is used as the width recovery amount.

[0097] In this embodiment, determine the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the same position in the rolled pieces obtained after variable-width rolling and variable-thickness rolling, so as to determine the width recovery amount of the medium-thick plate rolled piece after rolling at the vertical roll reduction rate and horizontal roll reduction rate during the combined rolling process of variable-width and variable-thickness.

[0098] Specifically, based on the first rolled piece and the second rolled piece, determine the reduction rate of the vertical roll at the target position point during variable-width rolling (i.e., the vertical roll reduction rate), the reduction rate of the horizontal roll at the target position point during variable-thickness rolling (i.e., the horizontal roll reduction rate), and the recovery amount in the width direction of the medium-thick plate rolled piece at the target position point before and after variable-thickness rolling (i.e., the width recovery amount). Then, based on the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point, determine the width recovery amount of the medium-thick plate rolled piece after rolling at the vertical roll reduction rate and horizontal roll reduction rate.

[0099] Further, as a refinement and extension of the specific implementation manner of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, determining the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point based on the first rolled piece and the second rolled piece includes: cutting the first rolled piece along the width direction of the first rolled piece at the target position point to obtain a first sectional view of the first rolled piece; cutting the second rolled piece along the width direction of the second rolled piece at the target position point to obtain a second sectional view of the second rolled piece; and determining the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point based on the first sectional view and the second sectional view.

[0100] In this embodiment, accurately locate the same position of the medium-thick plate rolled piece in the first rolled piece and the second rolled piece through the marked target position point, and accurately determine the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to this position in the form of sectional views, avoiding the influence brought by interference factors such as metal flow during the rolling process, and providing scientific data support.

[0101] Exemplarily, such as Figure 9As shown, the first rolled piece is cut along the width direction at the target position point of the first rolled piece to obtain the first cross-sectional view of the first rolled piece, so as to accurately reflect the actual compression of the vertical rolls on the width of the medium-thick plate rolled piece through the first cross-sectional view.

[0102] Similarly, as Figure 10 shown, the second rolled piece is cut along the width direction at the target position point of the second rolled piece to obtain the second cross-sectional view of the second rolled piece, so as to visually reflect the change in the thickness of the first rolled piece by the flat rolls through the second cross-sectional view.

[0103] Therefore, based on the first cross-sectional view and the second cross-sectional view, determine the vertical roll reduction rate, flat roll reduction rate, and width recovery amount corresponding to the target position point.

[0104] Further, as a refinement and extension of the specific implementation manner of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, based on the first cross-sectional view and the second cross-sectional view, determine the vertical roll reduction rate, flat roll reduction rate, and width recovery amount corresponding to the target position point, 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-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-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.

[0105] In this embodiment, according to the difference between the width of the first cross-sectional view and the initial width of the medium-thick plate rolled piece, determine the reduction amount of the vertical rolls on both sides of the medium-thick plate rolled piece at the target position point, and thus determine the vertical roll reduction rate corresponding to the target position point during the variable-width rolling process according to the ratio of the reduction amount of the vertical rolls on both sides of the medium-thick plate rolled piece at the target position point to the initial width of the medium-thick plate rolled piece.

[0106] Similarly, according to the difference in thickness between the first cross-sectional view and the second cross-sectional view, determine the reduction amount of the flat rolls on both sides of the first rolled piece at the target position point, and thus determine the flat roll reduction rate corresponding to the target position point during the variable-thickness rolling process according to the ratio of the reduction amount of the flat rolls on both sides of the first rolled piece at the target position point to the thickness of the first cross-sectional view (i.e., the initial thickness of the medium-thick plate rolled piece).

[0107] Further, as Figure 9 shown in Figure 10 and C shown, according to the width C 1 of the first cross-sectional view and the width

[0108] 2 of the second cross-sectional view, determine the width recovery amount corresponding to the medium-thick plate rolled piece at the target position point. Step 104, construct the corresponding relationship between the vertical roll reduction rate, flat roll reduction rate, and width recovery amount according to the vertical roll reduction rate, flat roll reduction rate, and width recovery amount corresponding to the target position point.

[0109] In this embodiment, according to the vertical roll reduction ratio, horizontal roll reduction ratio and width recovery amount corresponding to the target position point, the width recovery amount of the medium and heavy plate workpiece after rolling with different vertical roll reduction ratios and horizontal roll reduction ratios during the combined rolling process of variable width and variable thickness is statistically analyzed. By plotting in a drawing software, a three-dimensional relationship diagram of the width recovery amount and the vertical and horizontal roll reduction ratios can be obtained. Fitting all the data points can yield a mathematical model of the relationship between the vertical and horizontal roll reduction ratios and the width recovery amount. Through this model, the width recovery amount value of the medium and heavy plate workpiece after rolling with other vertical and horizontal roll reduction ratios can be better predicted, thereby using this model to guide the actual combined rolling process of variable width and variable thickness and improving the rolling accuracy.

[0110] Step 105: According to the corresponding relationship and the finished product size corresponding to the medium and heavy plate to be rolled, perform variable width rolling and variable thickness rolling on the medium and heavy plate to be rolled to obtain the target workpiece.

[0111] In this embodiment, using the corresponding relationship, according to the finished product size corresponding to the medium and heavy plate to be rolled, the combination of the vertical roll reduction ratio and the horizontal roll reduction ratio of the medium and heavy plate to be rolled in the combined rolling process of variable width and variable thickness is reasonably set. While rolling out the target workpiece with continuously changing thickness and width along the length direction, the width of the target workpiece can be made closer to the required finished product size of the medium and heavy plate to be rolled, improving the rolling accuracy, thereby minimizing the shearing amount in the width direction as much as possible, increasing the utilization rate of the medium and heavy plate, and further enhancing the efficiency of actual production.

[0112] It should be noted that the material properties of the medium and heavy plate workpiece in step 101 and the medium and heavy plate to be rolled in step 104 need to be consistent to ensure the reliability of variable width rolling and variable thickness rolling.

[0113] In one embodiment, in a finite element analysis system, a two-pass rolling process of variable width and variable thickness of a carbon structural steel plate workpiece is established to obtain a combined rolling model of the carbon structural steel plate workpiece. Among them, the process parameters of variable width rolling and variable thickness rolling in the combined rolling model are shown in Table 1.

[0114] Table 1

[0115]

[0116] Among them, the pusher is a part used to push the metal billet into the roll gap 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 Steels) standard.

[0117] Next, according to the required finished product dimensions of the carbon structural steel plate rolling piece and the initial dimensions of the carbon structural steel plate rolling piece, the range of the vertical roll reduction rate and the first inward speed in the variable-width rolling, as well as the range of the flat roll reduction rate and the second inward speed in the variable-thickness rolling are set in the combined rolling model.

[0118] Specifically, in this embodiment, the initial width of the carbon structural steel plate rolling piece is 1165 mm, the initial length is 1870 mm, and the initial thickness is 78 mm. Among the required finished product dimensions of the carbon structural steel plate rolling piece, the narrowest finished product width is 1105 mm, the widest finished product width is 1155 mm, the thickness at the thickest end of the finished product is 74 mm, and the thickness at the thinnest end of the finished product is 62 mm.

[0119] For the variable-width rolling in the combined rolling model, the initial roll gap of the vertical roll is set to 1155 mm, the range of the vertical roll reduction rate is set to 0.8% - 5.2%, and the range of the reduction amount of the width of the carbon structural steel plate rolling piece by the vertical rolls on both sides is 10 mm - 60 mm.

[0120] Next, the first linear speed of the vertical roll in the variable-width rolling of the carbon structural steel plate rolling piece is calculated and the first inward speed , expressed as: , . Further, according to and , the vertical rolls are used to perform variable-width rolling on the carbon structural steel plate rolling piece, and measurement position points are marked on the carbon structural steel plate rolling piece after variable-width rolling to obtain a marked rolling piece.

[0121] For the variable-thickness rolling in the combined rolling model, first, the length of the marked rolling piece is obtained, which is 2100 mm here. Then, the initial roll gap of the flat roll is set to 74 mm, the range of the flat roll reduction rate is set to 5.1% - 20.5%, and the range of the reduction amount of the thickness of the marked rolling piece by the flat rolls on both sides is 4 mm - 16 mm.

[0122] Next, the second linear speed of the flat roll in the variable-thickness rolling of the carbon structural steel plate rolling piece is calculated and the second inward speed , expressed as: , . Further, according to and , the flat rolls are used to perform variable-thickness rolling on the marked rolling piece to obtain the target steel plate rolling piece, thereby rolling a carbon structural steel plate with continuously changing thickness and width along the length direction.

[0123] Then, in the post-processing of the finite element analysis system, the marked rolled piece and the target steel plate rolled piece are respectively cut according to the measurement position points to obtain two experimental cross-sectional views. The width and thickness of the experimental cross-sectional views are accurately measured, so as to obtain the vertical roll reduction rate, horizontal roll reduction rate and width recovery amount values corresponding to the measurement position points according to the width and thickness of the two experimental cross-sectional views, thereby obtaining the width recovery amount value of the carbon structural steel plate rolled piece after rolling at the vertical roll reduction rate and horizontal roll reduction rate. The width recovery amount values of the carbon structural steel plate rolled pieces after rolling at different vertical roll reduction rates and horizontal roll reduction rates are statistically analyzed and plotted in a drawing software, and a three-dimensional relationship diagram of the width recovery amount and the vertical roll and horizontal roll reduction rates as shown in Figure 11 can be obtained. Then, all the data points are fitted to obtain a fitted surface as shown in Figure 12 . Furthermore, according to the fitted surface, a mathematical model of the width recovery amount of the carbon structural steel plate rolled piece can be obtained.

[0124] Exemplarily, the process of establishing the mathematical model of the width recovery amount of the carbon structural steel plate rolled piece is shown in Table 2.

[0125] Table 2

[0126]

[0127] Here, z' is the width recovery amount, x' is the vertical roll reduction rate, y' is the horizontal roll reduction rate.

[0128] It can be seen through Figure 12 that the deviation between the fitted surface and the three-dimensional relationship diagram is small. It can be seen from Table 2 that the R square is close to 1, proving that the fitting result is relatively accurate. At the same time, it is proved that the formula can be used to fit the relationship between different vertical roll reduction rates, horizontal roll reduction rates and width recovery amounts. Exemplarily, the mathematical model of the width recovery amount of the carbon structural steel plate rolled piece is expressed as: .

[0129] As shown in Table 3, since the mathematical model of the width recovery amount of the carbon structural steel plate rolled piece is relatively accurate, the specific value of the width recovery amount of the carbon structural steel plate rolled piece can be calculated through the mathematical model of the width recovery amount of the carbon structural steel plate rolled piece for different vertical roll reduction rates and horizontal roll reduction rates.

[0130] Table 3

[0131]

[0132] Thus, the mathematical model of the width recovery amount of the carbon structural steel plate rolling piece can be used to guide the actual combined rolling process of variable width and variable thickness of the carbon structural steel plate, so that the actually rolled carbon structural steel plate can be closer to the required finished product size of the carbon structural steel plate, improve the rolling accuracy, thus minimizing the shearing amount as much as possible, increasing the utilization rate of the carbon structural steel plate, and further enhancing the efficiency of actual production.

[0133] It should be noted that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0134] Furthermore, as Figure 13 shown, as a specific implementation of the rolling method for variable width and variable thickness of the above medium plate, the embodiment of the present application provides a rolling device 1300 for variable width and variable thickness of the medium plate. The rolling device 1300 for variable width and variable thickness of the medium plate includes: a simulation module 1301, a determination module 1302, and a rolling module 1303.

[0135] Among them, the simulation module 1301 is used to construct a rolling finite element model of the medium plate rolling piece; and, in the rolling finite element model, the vertical roll is used to perform variable width rolling on the medium plate rolling piece, and the target position points are marked on the medium plate rolling piece after variable width rolling to obtain the first rolling piece, and the horizontal roll is used to perform variable thickness rolling on the first rolling piece to obtain the second rolling piece;

[0136] The determination module 1302 is used to determine the vertical roll reduction rate, the horizontal roll reduction rate, and the width recovery amount corresponding to the target position points according to the first rolling piece and the second rolling piece; and, according to the vertical roll reduction rate, the horizontal roll reduction rate, and the width recovery amount corresponding to the target position points, establish the corresponding relationship between the vertical roll reduction rate, the horizontal roll reduction rate, and the width recovery amount;

[0137] The rolling module 1303 is used to perform variable width rolling and variable thickness rolling on the medium plate to be rolled according to the corresponding relationship and the finished product size corresponding to the medium plate to be rolled, so as to obtain the target rolling piece.

[0138] In one embodiment, the simulation module 1301 is specifically configured to obtain the range of vertical roll reduction ratios; determine the first inward velocity of the vertical roll and the first linear velocity of the vertical roll according to the initial width of the medium plate workpiece and the range of vertical roll reduction ratios; perform variable-width rolling on the medium plate workpiece by using the vertical roll according to the first inward velocity and the first linear velocity, so that the vertical roll moves from the first starting side of the medium plate workpiece along the length direction of the medium plate workpiece to the first stopping side at the first linear velocity, and the vertical roll moves from the first starting side of the medium plate workpiece along the width direction of the medium plate workpiece to the medium plate workpiece at the first inward velocity, and the first starting side and the first stopping side are determined according to the length direction and the width direction of the medium plate workpiece.

[0139] In one embodiment, the simulation module 1301 is specifically configured to determine the first target width between the first stopping sides and the second target width between the first starting sides according to the initial width of the medium plate workpiece and the range of vertical roll reduction ratios; determine the first inward velocity according to the first target width, the second target width, the initial length of the medium plate, and the radius and rotational speed of the vertical roll.

[0140] In one embodiment, the simulation module 1301 is specifically configured to obtain the range of horizontal roll reduction ratios; determine the second inward velocity of the horizontal roll and the second linear velocity of the horizontal roll according to the initial thickness of the medium plate workpiece and the range of horizontal roll reduction ratios; perform variable-thickness rolling on the first workpiece by using the horizontal roll according to the second inward velocity and the second linear velocity, so that the horizontal roll moves from the second starting side of the first workpiece along the length direction of the first workpiece to the second stopping side at the second linear velocity, and the horizontal roll moves from the second starting side of the first workpiece along the thickness direction of the first workpiece to the first workpiece at the second inward velocity, 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.

[0141] In one embodiment, the simulation module 1301 is specifically configured to determine the first target thickness between the second stopping sides and the second target thickness between the second starting sides according to the initial thickness of the medium plate workpiece and the range of horizontal roll reduction ratios; determine the second inward velocity according to the first target thickness, the second target thickness, the length of the first workpiece, and the radius and rotational speed of the horizontal roll.

[0142] In one embodiment, the determination module 1302 is specifically configured 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 ratio, the horizontal roll reduction ratio, and the width recovery amount corresponding to the target position point according to the first cross-sectional view and the second cross-sectional view.

[0143] In one embodiment, the determining module 1302 is specifically configured to determine 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 plate rolling piece; determine the horizontal 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 plate rolling piece; and determine 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.

[0144] For the specific limitations of the rolling device for variable width and variable thickness of medium plates, reference can be made to the limitations of the rolling method for variable width and variable thickness of medium plates in the foregoing text, which will not be elaborated here. Each module in the above rolling device for variable width and variable thickness of medium plates can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to the above respective modules.

[0145] Based on the above as Figure 1 shown in the method, correspondingly, an embodiment of the present application further provides a readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the rolling method for variable width and variable thickness of medium plates as shown in the above figure.

[0146] Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, and the software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various implementation scenarios of the present application.

[0147] Based on the above as Figure 1 shown in the method, and Figure 13 shown in the virtual device embodiment, for the purpose of achieving the above object, an embodiment of the present application further provides a computer device, which can specifically 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 implement the rolling method for variable width and variable thickness of medium plates as shown in the above Figure 1 figure.

[0148] Optionally, the computer device may further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, sensors, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc. Optionally, the user interface may further 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.

[0149] Those skilled in the art can understand that the structure of a computer device provided in this embodiment does not limit the computer device, and it may include more or fewer components, or combine certain components, or have different component arrangements.

[0150] The storage medium may further include an operating system and a network communication module. The operating system is a program for managing and storing 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 implement communication between components inside the storage medium, as well as communication between other hardware and software in the entity device.

[0151] Through the description of the above embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus a necessary general hardware platform, or can be implemented by hardware in the embodiments of this application.

[0152] Those skilled in the art can understand that the drawings are only schematic diagrams of a preferred embodiment scenario, and the modules or processes in the drawings are not necessarily essential for implementing this application. Those skilled in the art can understand that the modules in the devices in the embodiment scenario can be distributed in the devices in the embodiment scenario according to the description of the embodiment scenario, or can be correspondingly changed and located in one or more devices different from this embodiment scenario. The modules in the above embodiment scenario can be combined into one module, or further split into multiple sub-modules.

[0153] The above serial numbers of this application are only for description and do not represent the advantages or disadvantages of the embodiment scenarios. The above-disclosed are only several specific embodiment scenarios of this application. However, this application is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of this application.

Claims

1. A rolling method for medium-thick plates with variable width and variable thickness, characterized in that The method includes: Constructing a rolling finite element model of a medium plate rolling piece; In the rolling finite element model, using vertical rolls to perform variable-width rolling on the medium plate rolling piece, and marking target position points in the medium plate rolling piece after variable-width rolling to obtain a first rolling piece, and using horizontal rolls to perform variable-thickness rolling on the first rolling piece to obtain a second rolling piece; Determining the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point according to the first rolling piece and the second rolling piece; Constructing a corresponding relationship between the vertical roll reduction rate, horizontal roll reduction rate, and the width recovery amount according to the vertical roll reduction rate, horizontal roll reduction rate, and width recovery amount corresponding to the target position point; Performing variable-width rolling and variable-thickness rolling on the medium plate to be rolled according to the corresponding relationship and the finished product size corresponding to the medium plate to be rolled to obtain a target rolling piece; The performing variable-width rolling on the medium plate rolling piece by using vertical rolls includes: Obtaining a range of vertical roll reduction rates; Determining a first inward speed of the vertical roll and a first linear speed of the vertical roll according to the initial width of the medium plate rolling piece and the range of vertical roll reduction rates; Performing variable-width rolling on the medium plate rolling piece by using the vertical roll according to the first inward speed and the first linear speed, so that the vertical roll moves from a first starting side of the medium plate rolling piece along the length direction of the medium plate rolling piece at the first linear speed to a first stopping side of the medium plate rolling piece, and the vertical roll moves from the first starting side of the medium plate rolling piece along the width direction of the medium plate rolling piece at the first inward speed towards the medium plate rolling piece, and the first starting side and the first stopping side are determined according to the length direction and width direction of the medium plate rolling piece; The determining the first inward speed of the vertical roll according to the initial width of the medium plate rolling piece and the range of vertical roll reduction rates includes: 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 medium plate rolling piece and the range of vertical roll reduction rates; Determining the first inward speed according to the first target width, the second target width, the initial length of the medium plate, and the radius and rotation speed of the vertical roll.

2. The rolling method for medium and heavy plates with variable width and variable thickness according to claim 1, characterized in that, The performing variable-thickness rolling on the first rolling piece by using horizontal rolls includes: Obtaining a range of horizontal roll reduction rates; Determining a second inward speed of the horizontal roll and a second linear speed of the horizontal roll according to the initial thickness of the medium plate rolling piece and the range of horizontal roll reduction rates; Performing variable-thickness rolling on the first rolling piece by using the horizontal roll according to the second inward speed and the second linear speed, so that the horizontal roll moves from a second starting side of the first rolling piece along the length direction of the first rolling piece at the second linear speed to a second stopping side of the first rolling piece, and the horizontal roll moves from the second starting side of the first rolling piece along the thickness direction of the first rolling piece at the second inward speed towards the first rolling piece, and the second starting side and the second stopping side are determined according to the length direction and thickness direction of the first rolling piece.

3. The rolling method for medium-thick plates with variable width and variable thickness according to claim 2, characterized in that, Determining the second inward speed of the flat roll according to the initial thickness of the medium plate workpiece and the flat roll reduction rate range includes: Determining the second target thickness between the second starting sides and the first target thickness between the second stopping sides according to the initial thickness of the medium plate workpiece 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 workpiece, and the radius and rotation speed of the flat roll.

4. The rolling method for medium-thick plates with variable width and variable thickness according to claim 1, characterized in that, Determining the edger 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 includes: Cutting the first workpiece along the width direction of the first workpiece at 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 at the target position point to obtain a second cross-sectional view of the second workpiece; Determining the edger 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.

5. The rolling method for medium-thick plates with variable width and variable thickness according to claim 4, characterized in that, Determining the edger 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 edger 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 plate workpiece; 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 plate workpiece; 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.

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