A method and device for controlling the crown of a steel strip

Abstract

The present invention discloses a method and device for controlling the convexity of a steel strip, which is applied to an endless rolling production line. The method comprises: obtaining the convexity deviation of the current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a historical steel strip during continuous rolling, and the convexity deviation is the deviation between the actual convexity of the current steel strip and the target convexity; controlling the thickness of the intermediate billet of the target steel strip to increase to the target thickness based on the convexity deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip; and rolling the target steel strip using the intermediate billet of the target thickness so that the target steel strip reaches the target convexity. The control method of the present invention provides an effective means and an important guarantee for improving the finishing load, enhancing the convexity control capability, and meeting the convexity control target during the re-thickening process of the steel strip.

Description

Technical Field

[0001] The present application relates to the technical field of strip crown control, and in particular to a strip crown control method and device. Background Art

[0002] During the strip rolling process on a headless rolling line, strip rolling proceeds sequentially according to the production schedule. Rolling thin plates followed by thick plates is the re-thickening process of the headless rolling line. During this re-thickening process, the finishing load decreases due to factors such as reduced rolling speed or high inlet temperature, and the bending roll force drops to the lower limit, leaving no margin for regulation. This causes the strip's crown to continuously decrease and become uncontrollable. Due to the constraints of various conditions and other factors on the headless rolling line, the adjustment of various parameters during re-thickening has always been achieved manually. However, due to the limitations of operating experience and accuracy, manual operation cannot guarantee accurate judgment for each roll period requiring adjustment. As a result, the strip's crown control during headless rolling cannot meet expectations, and the crown hit rate is low.

[0003] Therefore, how to improve the hit rate of strip convexity on the headless rolling production line is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present invention provides a method and device for controlling the convexity of a steel strip, which improves the hit rate of the convexity of the steel strip on a headless rolling production line.

[0005] The embodiment of the present invention provides the following solutions:

[0006] In a first aspect, an embodiment of the present invention provides a method for controlling the crown of a steel strip, which is applied to an endless rolling production line. The method comprises:

[0007] Obtaining a crown deviation of a current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a historical steel strip during continuous rolling, and the crown deviation is a deviation between an actual crown of the current steel strip and a target crown;

[0008] controlling the intermediate billet thickness of the target steel strip to increase to a target thickness based on the crown deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip;

[0009] The target steel strip is rolled according to the intermediate billet of the target thickness so that the target steel strip reaches the target crown.

[0010] In an optional embodiment, before controlling the intermediate billet thickness of the target steel strip to increase to a target thickness based on the crown deviation and the yield strength of the target steel strip, the method further includes:

[0011] If the convexity deviation is greater than a preset convexity deviation threshold, the intermediate billet thickness of the target steel strip is controlled to increase to a target thickness according to the convexity deviation and the yield strength of the target steel strip.

[0012] In an optional embodiment, controlling the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip includes:

[0013] determining a single adjustment step of the intermediate billet roll on the headless rolling line according to a corresponding relationship between the crown deviation, the yield strength, and the roll gap;

[0014] The roll gap of the intermediate billet roll is adjusted according to the single adjustment step until the intermediate billet thickness of the target steel strip increases to the target thickness.

[0015] In an optional embodiment, the single adjustment step includes a first step and a second step, and determining the single adjustment step of the intermediate billet roll on the headless rolling line according to the corresponding relationship between the crown deviation, the yield strength and the roll gap includes:

[0016] If the yield strength is greater than a preset strength threshold, a first step is determined corresponding to the convexity deviation;

[0017] If the yield strength is not greater than a preset strength threshold, a second step distance is determined according to the convexity deviation; wherein the second step distance is greater than the first step distance.

[0018] In an optional embodiment, after adjusting the roll gap of the intermediate billet roll according to the single adjustment step, the method further includes:

[0019] Determining whether the bending roll force of the finishing mill on the endless rolling line reaches the lower limit of the bending roll force;

[0020] If yes, then repeatedly adjusting the roller gap according to the single adjustment step;

[0021] If not, the step of adjusting the roll gap according to the single adjustment step is not performed.

[0022] In an optional embodiment, after adjusting the roll gap of the intermediate billet roll according to the single adjustment step, the method further includes:

[0023] Determine whether the current roll gap reaches a preset roll gap upper limit value;

[0024] If not, continue to adjust the roller gap according to the single adjustment step;

[0025] If so, the target steel strip is rolled according to the intermediate billet rolled by the current roll gap.

[0026] In an optional embodiment, after rolling the target steel strip according to the intermediate billet of the target thickness, the method further includes:

[0027] According to the target thickness, rolling parameters of the target steel strip are updated.

[0028] In a second aspect, an embodiment of the present invention further provides a device for controlling the convexity of a strip steel, which is applied to an endless rolling production line, and the device comprises:

[0029] A first acquisition module is configured to acquire a crown deviation of a current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a historical steel strip during continuous rolling, and the crown deviation is a deviation between an actual crown of the current steel strip and a target crown;

[0030] a first control module, configured to control the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip;

[0031] The first rolling module is used to roll the target steel strip according to the intermediate billet of the target thickness so that the target steel strip reaches the target convexity.

[0032] In a third aspect, an embodiment of the present invention further provides an electronic device comprising a processor and a memory, wherein the memory is coupled to the processor and stores instructions that, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the first aspect.

[0033] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0034] Compared with the prior art, the method and device for controlling the crown of a steel strip provided by the present invention have the following advantages:

[0035] The present invention obtains the convexity deviation of the current strip steel less than the target convexity when the convexity of the strip steel can no longer be regulated due to factors such as the bending roll force of the production line having reached the lower limit during the continuous rolling and thickening rolling process of the headless rolling production line. According to the convexity deviation and the yield strength of the target strip steel, the thickness of the intermediate billet of the target strip steel is controlled to increase to the target thickness. The production line performs self-learning based on the intermediate billet with increased thickness, so that the rolling rolls in the bending roll force limit state can be released from this state and a certain convexity regulation ability can be restored. When the target strip steel is rolled according to the intermediate billet of the target thickness, the target strip steel can reach the target convexity, thereby improving the hit rate of the strip steel convexity on the headless rolling production line, and providing an effective means and important guarantee for improving the finishing rolling load, improving the convexity control ability and meeting the convexity control target during the thickening process of the strip steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A flow chart of a method for controlling the crown of a steel strip provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the thickness regulation of the roll period of the endless rolling production line provided by an embodiment of the present invention;

[0039] Figure 3 A flow chart of an endless rolling production line provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram comparing different strip crown control methods provided by embodiments of the present invention;

[0041] Figure 5 A schematic structural diagram of a strip crown control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the embodiments of the present invention.

[0043] See also Figure 1 , Figure 1A flow chart of a strip crown control method provided in an embodiment of the present invention, which is applied to an endless rolling production line, includes:

[0044] S11. Obtain the convexity deviation of the current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of historical steel strips during continuous rolling, and the convexity deviation is a deviation value between an actual convexity of the current steel strip and a target convexity.

[0045] Specifically, in an endless rolling line, strip steel is continuously produced according to the rolling schedule. The rolled thickness of the strip steel may be increased, that is, the rolled thickness of the current strip steel is increased compared to the historical strip steel. Figure 2 , the strip steel in area A in the figure all has thickness return, usually the rolling thickness is determined by group within a certain rolling period, Figure 2 Group a1 includes blocks 33 to 41 in terms of the number of headless rolling blocks; group a2 has a greater thickness than group a1 and includes blocks 42 to 56; group a3 has a greater thickness than group a2 and includes blocks 57 to 66; group a4 has a greater thickness than group a3 and includes blocks 67 to 80. The target convexity is the convexity required for the current strip quality and can be determined based on customer requirements or quality standards. The actual convexity can be measured using a convexity meter on the headless rolling line. The strip convexity represents the thickness deviation of the middle of the strip from a certain position on the edge and is an important indicator for measuring the rolling quality of the strip. For example, the convexity C40 represents the thickness deviation of the middle of the strip from a position 40 mm from the side to the middle. Therefore, the convexity deviation can reflect whether the current strip rolling quality meets the rolling requirements. After obtaining the convexity deviation of the current strip, step S12 is entered.

[0046] S12. Controlling the intermediate billet thickness of the target steel strip to increase to a target thickness according to the convexity deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip.

[0047] Specifically, the presence of crown deviation indicates that the endless rolling line is unable to control crown during rolling. This may be due to a stand in the finishing mill of the endless rolling line whose bending roll force has reached its limit. The target strip is the strip to be rolled in the finishing mill. By increasing the thickness of the intermediate bar, the production line can self-learn based on the increased intermediate bar thickness, allowing the roll stands that are at the bending roll force limit to release this state and restore a certain degree of crown control capability. It can be understood that the target thickness is the intermediate bar thickness after adjusting the intermediate bar thickness initially assigned to the endless rolling line. The yield strength of the target strip determines the fluidity of the strip during rolling. Therefore, the lower the yield strength, the greater the crown deviation and the greater the increase in intermediate bar thickness to the target thickness. Conversely, the higher the yield strength, the smaller the crown deviation and the smaller the increase in intermediate bar thickness to the target thickness.

[0048] In a specific embodiment, before controlling the intermediate billet thickness of the target steel strip to increase to the target thickness based on the crown deviation and the yield strength of the target steel strip, the method further includes:

[0049] If the convexity deviation is greater than a preset convexity deviation threshold, the intermediate billet thickness of the target strip is controlled to increase to a target thickness based on the convexity deviation and the yield strength of the target strip.

[0050] Specifically, the crown deviation threshold can be any value between 10 and 20 μm. If the crown deviation exceeds the preset threshold, it indicates that the quality may not meet the rolling requirements due to the crown deviation. In this case, the target strip intermediate bar thickness will be increased to the target thickness. Because there is a corresponding relationship between the roll gap and the intermediate bar thickness, this control can be achieved by increasing the gap between the rolls used to roll the intermediate bar.

[0051] During specific implementation, the roll gap of the intermediate billet roll is directly increased to the preset corresponding value. Since the adjustment process is a dynamic adjustment in the production process of the headless rolling production line, the intermediate billet thickness of the target strip may not accurately reach the target thickness.

[0052] In a specific embodiment, controlling the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip includes:

[0053] According to the corresponding relationship between the convexity deviation, yield strength and the roll gap, the single adjustment step of the intermediate billet roll on the headless rolling line is determined; according to the single adjustment step, the roll gap of the intermediate billet roll is adjusted until the intermediate billet thickness of the target strip steel increases to the target thickness.

[0054] Specifically, the single adjustment step is the preset single adjustment amount for the roll gap. It can be a fixed value or a progressively changing value. That is, the larger the crown deviation, the larger the single adjustment step, and vice versa. There is a corresponding relationship between crown deviation, yield strength, and roll gap, and the single adjustment step can be determined through calibration experiments. Based on the single adjustment step, the roll gap of the intermediate bar rolls is gradually adjusted until the intermediate bar thickness of the target strip reaches the target thickness, enabling precise control of the intermediate bar thickness.

[0055] In a specific embodiment, a single adjustment step includes a first step and a second step. According to the corresponding relationship between the crown deviation, the yield strength and the roll gap, the single adjustment step of the intermediate billet roll on the endless rolling line is determined, including:

[0056] If the yield strength is greater than the preset strength threshold, the first step is determined according to the convexity deviation; if the yield strength is not greater than the preset strength threshold, the second step is determined according to the convexity deviation; wherein the second step is greater than the first step.

[0057] Specifically, the strength threshold can be set at 500 MPa. If the yield strength is greater than the preset strength threshold, it indicates that the yield strength of the target strip is relatively high, and excessive adjustments to the intermediate billet thickness should be avoided. A first step distance, such as 0.1 mm or other set values, is determined based on the crown deviation. If the yield strength is not greater than the preset strength threshold, it indicates that the yield strength of the target strip is relatively low, and a second step distance, such as 0.2 mm, is determined based on the crown deviation.

[0058] In a specific embodiment, after adjusting the roll gap of the intermediate billet roll according to a single step adjustment, the method further includes:

[0059] Determine whether the bending roll force of the finishing mill on the headless rolling line reaches the lower limit of the bending roll force; if so, repeatedly adjust the roll gap according to the single adjustment step; if not, do not adjust the roll gap according to the single adjustment step.

[0060] Specifically, the lower limit of the bending roll force can be set according to the actual conditions of each stand on the finishing mill, for example, 200-400kN. If the bending roll force of the finishing mill reaches the lower limit of the bending roll force, it means that the convexity of the target strip cannot be controlled by the bending roll force. The intermediate billet thickness needs to be further increased to restore a certain convexity control capability of the finishing mill. In this case, the roll gap adjustment based on the single adjustment step is repeated. If the bending roll force of the finishing mill does not reach the lower limit of the bending roll force, it means that there is a surplus of bending roll force and the convexity of the target strip can be controlled. In this case, the roll gap adjustment is no longer performed. It is ensured that the roll gap is controlled within an appropriate adjustment amount to improve the stability of the headless rolling line in rolling various strips. It should be noted that the bending roll force of the finishing mill has a limit state, specifically including reaching the lower limit value or the upper limit value of the bending roll force; as mentioned above, when the lower limit value of the bending roll force is reached, the roll gap is increased according to the single adjustment step; conversely, when the upper limit value of the bending roll force is reached, the roll gap is reduced according to the single adjustment step.

[0061] In a specific embodiment, after adjusting the roll gap of the intermediate billet roll according to a single step adjustment, the method further includes:

[0062] Determine whether the current roll gap reaches a preset roll gap upper limit; if not, continue to adjust the roll gap according to a single adjustment step; if so, roll the target strip steel according to the intermediate billet rolled by the current roll gap.

[0063] Specifically, the roll gap upper limit is a preset upper limit for the adjustment of each stand on the finishing mill. If the current roll gap reaches the preset upper limit, it indicates that further increase in the roll gap is no longer possible, and the target strip is rolled using the intermediate bar rolled at the current roll gap. Conversely, if the current roll gap does not reach the preset upper limit, it indicates that there is sufficient room for increase in the roll gap, and the roll gap continues to be adjusted according to the single adjustment step until the intermediate bar thickness reaches the target thickness. After the intermediate bar thickness of the target strip is increased to the target thickness, the process proceeds to step S13.

[0064] S13. Rolling the target steel strip according to the intermediate billet of the target thickness so that the target steel strip reaches the target crown.

[0065] Specifically, the headless rolling production line can self-learn through the intermediate billet of target thickness and automatically adjust the rolling force of each stand on the finishing mill to roll out the target strip steel with the target convexity.

[0066] In a specific embodiment, after rolling a target steel strip according to an intermediate billet of target thickness, the method further includes:

[0067] According to the target thickness, the rolling parameters of the target strip are updated.

[0068] Specifically, since the target thickness of the strip may involve multiple groups during the continuous rolling process, after the rolling parameters of the target strip are updated according to the target thickness, when the strip of the target thickness is rolled again, the intermediate billet can be directly rolled to the target thickness, and then the finished strip can be rolled out. Each piece of the reorganized strip can meet the convexity quality requirements.

[0069] The following embodiment of the present invention will take the three-stand roughing and five-stand finishing tandem mills of a headless rolling production line as an example, and use the embodiment of the present invention to automatically control and adjust the thickness of the intermediate billet during the thickening process to illustrate the application of the convexity control method in the headless rolling thickening process.

[0070] See also Figure 3 , select the relevant parameters of the endless rolling production line roll period, such as the steel grade and specification configuration of the main rolled material; identify the layer transition (i.e., the thickening position) and the number of strips with the same thickness during the roll period thickening process; determine the steel grade index, width index and thickness index, and determine the first piece position of the first group of strips with the same index value during the thickening process; determine the maximum thickness adjustment amount H of the intermediate billet under this steel grade and thickness index 2max1 and the maximum value of the intermediate billet rethickening length adjustment △h max1 At the beginning of rolling, when it is detected that the deviation between the actual convexity of the current strip and the target convexity exceeds the set threshold, the thickness and length of the intermediate billet are adjusted when rolling the next strip, and the adjustment amount is ensured not to exceed the maximum value H of the intermediate billet thickness adjustment amount. 2max1and the maximum value of the intermediate billet rethickening length adjustment △h max1 , record the thickness adjustment amplitude P of each strip intermediate billet under this thickness layer i And the number of blocks Q to be adjusted; after the thickness of the intermediate billet of the first group of strip steel with the same thickness layer is adjusted during the re-thickening process, continue to adjust the thickness of the intermediate billet of the strip steel with the same steel grade, thickness and width index value in the second and third groups in the same manner. The thickness adjustment amount of the intermediate billet of different steel grades under different thickness and width indexes has different requirements. This method can flexibly implement differentiated adjustments, so that complex rolling conditions can automatically determine whether the intermediate billet thickness needs to be adjusted and automatically execute it, effectively avoiding the constraints of human factors such as operating experience and conservative operation, and can make accurate judgments on each roll period that requires intermediate billet thickness adjustment to achieve the purpose and effect of regulation.

[0071] Take the rolling of a certain high-strength steel roll as an example. The thickness of the main rolling material is in the range of 1.5-3.0mm. The thickness specification of this steel type is mainly 1.5mm for endless rolling. On this basis, the thickening rolling is carried out. When the thickness is reduced from 1.5mm to 1.8mm at the end of the roll, the crown begins to decrease and the crown hit rate decreases. Figure 4 In the area of frame line m, the average convexity of the strip is 10.9μm, and the hit rate is 78.1%. After detecting that the deviation of the actual convexity from the target convexity is greater than the preset convexity deviation threshold, the thickness of the intermediate billet is increased to increase the finishing load, buffer the effect of excessive thermal expansion, and gradually increase the convexity of the strip, thereby increasing the convexity hit rate. Figure 4 In the area marked with line n, the average strip crown is 28.4μm, with a hit rate of 99.75%. Increasing the intermediate thickness during the final roll re-thickening process has a significant effect on improving crown control.

[0072] Therefore, it can be seen that the crown control method of the embodiment of the present invention can effectively and accurately control the strip to achieve the target crown through practical field application. In particular, during the final roll thickening process, as the pulling speed decreases, thermal expansion increases, and the bending roll force reaches its limit, the crown reduction is further exacerbated, weakening the crown control ability. The control method of the present invention automatically adjusts the intermediate billet thickness according to actual rolling conditions and requirements, providing an effective means to improve the crown control ability and improve the crown control effect.

[0073] Based on the same inventive concept as the control method, the embodiment of the present invention also provides a strip crown control device for use in an endless rolling production line. Figure 5 , the device comprises:

[0074] A first acquisition module 501 is configured to acquire a crown deviation of a current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a previous steel strip during continuous rolling, and the crown deviation is a deviation between an actual crown of the current steel strip and a target crown;

[0075] a first control module 502 configured to control the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip;

[0076] The first rolling module 503 is used to roll the target steel strip according to the intermediate billet of the target thickness, so that the target steel strip reaches the target crown.

[0077] In an optional embodiment, the device further includes:

[0078] The first execution module is used to control the intermediate billet thickness of the target steel strip to increase to a target thickness based on the crown deviation and the yield strength of the target steel strip when the crown deviation is greater than a preset crown deviation threshold.

[0079] In an optional embodiment, the first control module includes:

[0080] A first determination submodule is configured to determine a single adjustment step of the intermediate billet roll on the headless rolling line according to a correspondence between the crown deviation, the yield strength, and the roll gap;

[0081] The first adjustment submodule is used to adjust the roll gap of the intermediate billet roll according to the single adjustment step until the intermediate billet thickness of the target strip steel increases to the target thickness.

[0082] In an optional embodiment, the single adjustment step includes a first step and a second step, and the first determination submodule includes:

[0083] a first determining unit, configured to determine a first step according to the convexity deviation when the yield strength is greater than a preset strength threshold;

[0084] The second determining unit is configured to determine a second step distance according to the convexity deviation when the yield strength is not greater than a preset strength threshold; wherein the second step distance is greater than the first step distance.

[0085] In an optional embodiment, the first control module further includes:

[0086] The second determination submodule is used to determine whether the bending roll force of the finishing mill on the endless rolling production line reaches the lower limit value of the bending roll force;

[0087] A first execution submodule is configured to repeatedly execute the step of adjusting the roll gap according to the single adjustment step when the bending force of the intermediate billet roll reaches a lower limit of the bending force;

[0088] The second execution submodule is used for not executing the adjustment of the roll gap according to the single adjustment step when the bending roll force of the intermediate billet roll does not reach the lower limit of the bending roll force.

[0089] In an optional embodiment, the first control module further includes:

[0090] The third determination submodule is used to determine whether the current roll gap reaches a preset roll gap upper limit value;

[0091] A third execution submodule is configured to, when it is determined that the current roll gap has not reached a preset roll gap upper limit, continue to adjust the roll gap according to the single adjustment step;

[0092] The rolling submodule is used to roll the target strip steel according to the intermediate billet rolled by the current roll gap when it is determined that the current roll gap reaches a preset roll gap upper limit value.

[0093] In an optional embodiment, the device further includes:

[0094] An updating module is used to update the rolling parameters of the target strip according to the target thickness.

[0095] Based on the same inventive concept as the control method, an embodiment of the present invention also provides an electronic device, including a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the control methods.

[0096] Based on the same inventive concept as the control method, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any one of the control methods when executed by a processor.

[0097] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0098] By obtaining the convexity deviation of the current strip when it is less than the target convexity when the convexity of the strip can no longer be controlled due to factors such as the bending roll force of the production line having reached the lower limit during the continuous rolling and thickening rolling process of the headless rolling production line, and controlling the thickness of the intermediate billet of the target strip to increase to the target thickness according to the convexity deviation and the yield strength of the target strip, the production line performs self-learning according to the intermediate billet with increased thickness, so that the rolling rolls in the bending roll force limit state can be released from this state and a certain convexity control ability can be restored. When the target strip is rolled according to the intermediate billet of the target thickness, the target strip can reach the target convexity, thereby improving the hit rate of the strip convexity on the headless rolling production line, and providing an effective means and important guarantee for improving the finishing rolling load, improving the convexity control ability and meeting the convexity control target during the thickening process of the strip.

[0099] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0100] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0101] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0102] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0103] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for controlling the convexity of a strip steel, characterized in that: Applied to an endless rolling production line, the method comprises: Obtaining a crown deviation of a current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a historical steel strip during continuous rolling, and the crown deviation is a deviation between an actual crown of the current steel strip and a target crown; controlling the intermediate billet thickness of the target steel strip to increase to a target thickness based on the crown deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip; The target steel strip is rolled according to the intermediate billet of the target thickness so that the target steel strip reaches the target crown.

2. The method for controlling the steel strip crown according to claim 1, wherein: Before controlling the intermediate billet thickness of the target steel strip to increase to a target thickness based on the crown deviation and the yield strength of the target steel strip, the method further includes: If the convexity deviation is greater than a preset convexity deviation threshold, the intermediate billet thickness of the target steel strip is controlled to increase to a target thickness according to the convexity deviation and the yield strength of the target steel strip.

3. The method for controlling the steel strip crown according to claim 1, wherein: The step of controlling the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip comprises: determining a single adjustment step of the intermediate billet roll on the headless rolling line according to a corresponding relationship between the crown deviation, the yield strength, and the roll gap; The roll gap of the intermediate billet roll is adjusted according to the single adjustment step until the intermediate billet thickness of the target steel strip increases to the target thickness.

4. The method for controlling the steel strip crown according to claim 3, characterized in that: The single adjustment step includes a first step and a second step, and determining the single adjustment step of the intermediate billet roll on the headless rolling line according to the corresponding relationship between the crown deviation, the yield strength and the roll gap includes: If the yield strength is greater than a preset strength threshold, a first step is determined according to the convexity deviation; If the yield strength is not greater than a preset strength threshold, a second step distance is determined according to the convexity deviation; wherein the second step distance is greater than the first step distance.

5. The method for controlling the steel strip crown according to claim 3, wherein: After adjusting the roll gap of the intermediate billet roll according to the single adjustment step, the method further includes: Determining whether the bending roll force of the finishing mill on the endless rolling line reaches the lower limit of the bending roll force; If yes, then repeatedly adjusting the roller gap according to the single adjustment step; If not, the step of adjusting the roll gap according to the single adjustment step is not performed.

6. The method for controlling the steel strip crown according to claim 3, wherein: After adjusting the roll gap of the intermediate billet roll according to the single adjustment step, the method further includes: Determine whether the current roll gap reaches a preset roll gap upper limit; If not, continue to adjust the roll gap according to the single adjustment step; If so, the target steel strip is rolled according to the intermediate billet rolled by the current roll gap.

7. The method for controlling the steel strip crown according to claim 1, wherein: After rolling the target steel strip according to the intermediate billet of the target thickness, the method further comprises: According to the target thickness, rolling parameters of the target steel strip are updated.

8. A device for controlling the crown of a steel strip, characterized in that: Applied to an endless rolling production line, the device comprises: A first acquisition module is configured to acquire a crown deviation of a current steel strip, wherein the current steel strip is a steel strip having a thickness greater than that of a historical steel strip during continuous rolling, and the crown deviation is a deviation between an actual crown of the current steel strip and a target crown; a first control module, configured to control the intermediate billet thickness of the target steel strip to increase to a target thickness according to the crown deviation and the yield strength of the target steel strip, wherein the specification and steel grade of the target steel strip are the same as those of the current steel strip; The first rolling module is used to roll the target steel strip according to the intermediate billet of the target thickness so that the target steel strip reaches the target convexity.

9. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory is coupled to the processor and stores instructions, and when the instructions are executed by the processor, the electronic device executes the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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