Rolling control method, device and equipment for rolling mill

Abstract

The invention discloses a rolling control method, device and equipment for a rolling mill, and the method comprises the steps: obtaining the operation side tension and the driving side tension of the rolling mill when the rolling mill rolls strip steel; determining a detection tension deviation of the rolling mill based on the operation side tension and the driving side tension; and if the detected tension deviation of the rolling mill is larger than the preset tension deviation threshold value, the rolling speed of the rolling mill is lowered based on the detected tension deviation of the rolling mill. The technical problem that the qualified rate of finished strip steel is low is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to a rolling control method, device and equipment for a rolling mill. Background Art

[0002] When the strip is rolled by the rolling mill, the strip often has production problems such as wave shape, strip breakage or edge cracking, which in turn leads to a low pass rate of the finished strip, increases enterprise costs and reduces enterprise competitiveness. Therefore, the low pass rate of the finished strip is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present invention provide a rolling control method, device and equipment for a rolling mill, which solve the technical problem of low qualified rate of finished strip steel.

[0004] In the first aspect, an embodiment of the present invention provides a rolling control method for a rolling mill, comprising: when the rolling mill rolls a strip steel, obtaining an operating side tension and a driving side tension of the rolling mill; based on the operating side tension and the driving side tension, determining a detection tension deviation of the rolling mill; if the detection tension deviation of the rolling mill is greater than a preset tension deviation threshold, lowering the rolling speed of the rolling mill based on the detection tension deviation of the rolling mill.

[0005] In combination with the first aspect of the present invention, in some embodiments, lowering the rolling speed of the rolling mill based on the detected tension deviation of the rolling mill includes: determining a speed attenuation amount based on the detected tension deviation of the rolling mill, wherein a greater the detected tension deviation of the rolling mill, a greater the speed attenuation amount; and lowering the rolling speed of the rolling mill based on the speed attenuation amount.

[0006] In combination with the first aspect of the present invention, in some embodiments, it also includes: obtaining the operating side rolling force and the driving side rolling force of the rolling mill; determining the detected rolling force deviation of the rolling mill based on the operating side rolling force and the driving side rolling force; if the detected rolling force deviation of the rolling mill is greater than a preset rolling force deviation threshold, lowering the rolling speed of the rolling mill based on the detected rolling force deviation of the rolling mill.

[0007] In combination with the first aspect of the present invention, in some embodiments, it also includes: obtaining the offset of the steel strip; if the offset of the steel strip is greater than a preset offset threshold, lowering the rolling speed of the rolling mill based on the offset of the steel strip.

[0008] In connection with the first aspect of the present invention, in some embodiments, before the rolling mill rolls the strip steel, the method further includes: obtaining the set reduction ratio for each pass among a plurality of passes set for the strip steel; increasing the set reduction ratio of the last pass among the plurality of passes and decreasing the set reduction ratio of the remaining passes among the plurality of passes to obtain the corrected reduction ratio for each pass among the plurality of passes; wherein, the remaining passes are the passes other than the last pass among the plurality of passes.

[0009] In connection with the first aspect of the present invention, in some embodiments, it further includes: at the initial stage when the rolling mill rolls the strip steel, obtaining the rolling parameters of the rolling mill; predicting the shape defect of the strip steel based on the rolling parameters; determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill based on the rolling parameters and the shape defect of the strip steel.

[0010] In connection with the first aspect of the present invention, in some embodiments, the rolling parameters include the rolling force of the rolling mill, and determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill based on the rolling parameters and the shape defect of the strip steel includes: if the rolling force of the rolling mill is 5000 kn and the shape defect of the strip steel is middle wave, then the shifting amount of the intermediate roll is 30 mm and the bending force of the intermediate roll is -100 kn; if the rolling force of the rolling mill is 5500 kn and the shape defect of the strip steel is middle wave, then the shifting amount of the intermediate roll is 40 mm and the bending force of the intermediate roll is -50 kn; if the rolling force of the rolling mill is 6000 kn and the shape defect of the strip steel is middle wave, then the shifting amount of the intermediate roll is 60 mm and the bending force of the intermediate roll is -10 kn; if the rolling force of the rolling mill is 7000 kn and the shape defect of the strip steel is middle wave, then the shifting amount of the intermediate roll is 70 mm and the bending force of the intermediate roll is 50 kn.

[0011] In connection with the first aspect of the present invention, in some embodiments, the strip steel is fine blanking steel, the thickness of the fine blanking steel is less than 0.5 mm, the crown of the fine blanking steel is 40 - 60 microns, the crown of the fine blanking steel is greater than the wedge value of the fine blanking steel, and the coiling temperature of the fine blanking steel is greater than 50 degrees Celsius.

[0012] In a second aspect, an embodiment of the present invention provides a rolling control device for a rolling mill, including: a tension acquisition unit for acquiring the operating side tension and the drive side tension of the rolling mill when the rolling mill rolls the strip steel; a deviation determination unit for determining the detected tension deviation of the rolling mill based on the operating side tension and the drive side tension; a speed control unit for, if the detected tension deviation of the rolling mill is greater than a preset tension deviation threshold, reducing the rolling speed of the rolling mill based on the detected tension deviation of the rolling mill.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where when the processor executes the computer program, the method described in any item of the first aspect is implemented.

[0014] One or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:

[0015] In the embodiment of the present invention, when rolling a strip steel by a rolling mill, the operating side tension and the driving side tension of the rolling mill are obtained; based on the operating side tension and the driving side tension, the detected tension deviation of the rolling mill is determined; if the detected tension deviation of the rolling mill is greater than a preset tension deviation threshold, based on the detected tension deviation of the rolling mill, the rolling speed of the rolling mill is reduced. When the detected tension deviation of the rolling mill is greater than the preset tension deviation threshold, the strip steel is unevenly stressed and there is a risk of strip breakage. At this time, reducing the rolling speed of the rolling mill can avoid the situation where the internal stress of the strip steel is not fully released and adjusted in time, thereby avoiding the formation of excessive stress concentration in a local area of the strip steel, and further reducing the risk of strip breakage. Therefore, the qualified rate of the finished strip steel is improved. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the rolling control method of the rolling mill in the embodiment of the present invention;

[0018] Figure 2 It is a functional module diagram of the rolling control device of the rolling mill in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the electronic device in the embodiment of the present invention. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] In the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unachievable, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] An embodiment of the present invention provides a rolling control method for a rolling mill. Referring to Figure 1 as shown, the method includes the following steps S101 to S103:

[0023] S101: When the rolling mill rolls the strip steel, obtain the operating side tension and the driving side tension of the rolling mill.

[0024] In some embodiments, the strip steel can be fine blanking steel. The thickness of the fine blanking steel is less than 0.5 millimeters, the crown of the fine blanking steel is 40 - 60 microns, the crown of the fine blanking steel is greater than the wedge value of the fine blanking steel, and the coiling temperature of the fine blanking steel is greater than 50 degrees Celsius.

[0025] S102: Based on the operating side tension and the driving side tension, determine the detected tension deviation of the rolling mill.

[0026] In some embodiments, step S102 can be: Take the absolute value of the difference between the operating side tension and the driving side tension as the first value; take the quotient of the first value and the driving side tension as the detected tension deviation of the rolling mill.

[0027] In some other embodiments, step S102 can be: Take the absolute value of the difference between the operating side tension and the driving side tension as the detected tension deviation of the rolling mill.

[0028] S103: If the detected tension deviation of the rolling mill is greater than a preset tension deviation threshold, based on the detected tension deviation of the rolling mill, lower the rolling speed of the rolling mill.

[0029] It should be noted that when the detected tension deviation of the rolling mill is greater than the preset tension deviation threshold, it indicates that there is a risk of strip breakage for the strip steel. The greater the detected tension deviation of the rolling mill, the greater the risk of strip breakage.

[0030] In some embodiments, based on the detected tension deviation of the rolling mill, lowering the rolling speed of the rolling mill can include: Based on the detected tension deviation of the rolling mill, determine the speed attenuation amount, where the greater the detected tension deviation of the rolling mill, the greater the speed attenuation amount; based on the speed attenuation amount, lower the rolling speed of the rolling mill.

[0031] In some embodiments, to determine the speed attenuation based on the detected tension deviation of the rolling mill, it may be: inputting the detected tension deviation of the rolling mill into a preset corresponding relationship to obtain the speed attenuation; wherein, the preset corresponding relationship is a non-linear corresponding relationship between the detected tension deviation of the rolling mill and the speed attenuation, and the greater the detected tension deviation of the rolling mill, the greater the increasing trend of the speed attenuation.

[0032] It should be noted that when the detected tension deviation of the rolling mill is close to the tension deviation threshold, there is a risk of strip breakage for the strip steel, but the risk is relatively small. At this time, the rolling speed of the rolling mill can be reduced by a relatively small speed attenuation amount, ensuring the rolling efficiency of the rolling mill. When the detected tension deviation of the rolling mill gradually increases, there is a risk of strip breakage for the strip steel and the risk is relatively large. Due to the setting of the preset corresponding relationship, the speed attenuation amount can increase rapidly, realizing the timely reduction of the risk of strip breakage. Therefore, the embodiments of the present invention achieve the beneficial effect of taking into account the rolling efficiency of the rolling mill and reducing the risk of strip breakage by setting the preset corresponding relationship.

[0033] In some embodiments, the rolling control method of the rolling mill may further include: obtaining the rolling force on the operator side and the driving side of the rolling mill; determining the detected rolling force deviation of the rolling mill based on the rolling force on the operator side and the driving side of the rolling mill; if the detected rolling force deviation of the rolling mill is greater than the preset rolling force deviation threshold, reducing the rolling speed of the rolling mill based on the detected rolling force deviation of the rolling mill.

[0034] It should be noted that the detected rolling force deviation of the rolling mill being greater than the preset rolling force deviation threshold indicates that there is a risk of strip breakage for the strip steel. The greater the detected rolling force deviation of the rolling mill, the greater the risk of strip breakage.

[0035] In some embodiments, to determine the detected rolling force deviation of the rolling mill based on the rolling force on the operator side and the driving side of the rolling mill, it may be: taking the absolute value of the difference between the rolling force on the operator side and the driving side of the rolling mill as the detected rolling force deviation of the rolling mill.

[0036] In some embodiments, to reduce the rolling speed of the rolling mill based on the detected rolling force deviation of the rolling mill, it may be: determining the speed attenuation amount based on the detected rolling force deviation of the rolling mill, wherein the greater the detected rolling force deviation of the rolling mill, the greater the speed attenuation amount; reducing the rolling speed of the rolling mill based on the speed attenuation amount.

[0037] In some embodiments, the rolling control method of the rolling mill may further include: obtaining the offset of the strip steel; if the offset of the strip steel is greater than the preset offset threshold, reducing the rolling speed of the rolling mill based on the offset of the strip steel.

[0038] It should be noted that the offset of the strip steel being greater than the preset offset threshold indicates that there is a risk of strip breakage for the strip steel. The greater the offset of the strip steel, the greater the risk of strip breakage.

[0039] In some embodiments, based on the offset of the strip steel, reducing the rolling speed of the rolling mill may be as follows: based on the offset of the strip steel, determining the speed attenuation amount, where the larger the offset of the strip steel, the larger the speed attenuation amount; based on the speed attenuation amount, reducing the rolling speed of the rolling mill.

[0040] In some embodiments, before the rolling mill rolls the strip steel, the method may further include: obtaining the set reduction rate for each pass in a plurality of passes set for the strip steel; increasing the set reduction rate of the last pass in the plurality of passes and reducing the set reduction rate of the remaining passes in the plurality of passes to obtain the corrected reduction rate for each pass in the plurality of passes; where the remaining passes are the passes other than the last pass in the plurality of passes.

[0041] It should be noted that during the rolling process of conventional strip steel, the setting of the reduction rate of the last pass usually follows the minimization principle. This strategy aims to ensure the final thickness accuracy of the strip steel and maintain the stability of the strip shape by reducing the deformation amount of the last pass. Therefore, the set reduction rate of multiple passes can be used for conventional strip steel. However, due to the characteristics of fine blanking steel, such as its thinness and high deformation resistance, especially during the processing of the last pass, the work hardening phenomenon of the material is particularly significant and close to the limit state. At this time, if the principle of minimizing the reduction rate of the last pass is continued to be followed, as the rolling force continues to increase, the thickness of the strip steel may no longer change significantly, while the load borne by the rolling mill rises sharply, ultimately leading to a strip break accident. To solve this problem, the embodiments of the present invention optimize the reduction rate specifically, increase the set reduction rate of the last pass in a plurality of passes, for example, increase it by 5% - 10% on the original basis of the set reduction rate of the last pass. The purpose of this adjustment is to reserve a certain deformation space for the last pass and avoid concentrating all the deformation amounts in the previous rolling passes, which can effectively improve the rolling stability, reduce the load borne by the rolling mill, and further reduce the risk of strip break accidents caused by abnormal increase in the rolling force.

[0042] In some embodiments, the rolling control method of the rolling mill may further include: at the initial stage of the rolling mill rolling the strip steel, obtaining the rolling parameters of the rolling mill; predicting the strip shape defects of the strip steel based on the rolling parameters; determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill based on the rolling parameters and the strip shape defects of the strip steel.

[0043] It should be noted that the shifting amount of the intermediate roll and the bending force of the intermediate roll determined based on the rolling parameters and the strip shape defects of the strip steel are used to suppress the strip shape defects of the strip steel, thereby improving the qualified rate of the finished strip steel. The initial stage of the rolling mill rolling the strip steel may refer to the stage corresponding to the initial strip steel rolling speed of 0 - 30 mpm.

[0044] In some embodiments, the rolling parameters include the rolling force of the rolling mill. Based on the rolling parameters and the shape defects of the strip steel, determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill may include: If the rolling force of the rolling mill is 5000 kn and the shape defect of the strip steel is center wave, then the shifting amount of the intermediate roll is 30 mm and the bending force of the intermediate roll is -100 kn; If the rolling force of the rolling mill is 5500 kn and the shape defect of the strip steel is center wave, then the shifting amount of the intermediate roll is 40 mm and the bending force of the intermediate roll is -50 kn; If the rolling force of the rolling mill is 6000 kn and the shape defect of the strip steel is center wave, then the shifting amount of the intermediate roll is 60 mm and the bending force of the intermediate roll is -10 kn; If the rolling force of the rolling mill is 7000 kn and the shape defect of the strip steel is center wave, then the shifting amount of the intermediate roll is 70 mm and the bending force of the intermediate roll is 50 kn.

[0045] It should be noted that the rolling difficulties in the cold rolling production of thin - gauge fine - blanking steel are mainly reflected in the following aspects: First, the control of rolling speed and reduction: The control of reduction and rolling speed is crucial for ensuring the dimensional accuracy and surface quality of the product. The selection of passes and reduction ratio are crucial for production stability. If the reduction ratio is used improperly, it will cause starting strip breakage and high - speed running - off - track strip breakage accidents. Thin - gauge fine - blanking steel has a relatively high speed during rolling, and it is difficult to control and adjust during threading, and accidents such as steel piling and tail whipping are likely to occur. It is necessary to make reasonable adjustments according to the material characteristics and the performance of the rolling mill to avoid defects such as cracks and folds. Second, lubrication and cooling: Good lubrication and cooling are crucial for ensuring the smooth progress of the rolling process. It is necessary to select a suitable lubricant and ensure its stability and uniformity during the rolling process to reduce friction and resistance, reduce roll wear and energy consumption. At the same time, effective cooling measures need to be taken to prevent the strip steel surface from changing due to high temperature generated by friction. Third, roll wear and roll profile control: The rolls will be severely worn during the rolling process, affecting the roll gap shape and rolling accuracy. It is necessary to regularly check and replace the rolls to ensure their roll profile accuracy and rolling performance. At the same time, it is necessary to optimize the roll pre - heating and cooling processes to reduce the influence of uneven roll thermal expansion on the strip shape. Fourth, operation skills and experience: Operators need to have rich experience and skills to handle various emergencies. It is necessary to strictly abide by safety regulations and operating procedures to ensure the smooth progress of the production process. The skill level of operators has an important impact on the stability of the rolling process and the product quality. In summary, the rolling difficulties in the cold rolling production of thin - gauge fine - blanking steel involve multiple aspects such as material characteristics, rolling process and technical requirements, equipment and operation requirements, and other challenges. To overcome these difficulties, it is necessary to strengthen technology research and development and innovation, improve production efficiency and product quality to meet the market demand.

[0046] It should be noted that during the cold rolling production of thin - gauge fine blanking steel, if the rolling speed and reduction are not controlled according to the special requirements of this steel type, strip breaks may frequently occur during the rolling process. The production parameters are not set properly, resulting in an abnormal increase in the load during the rolling process. The model control strategy is inappropriate, and the deformation of the roll system caused by the abnormal increase in the rolling force is not compensated, so the strip shape is out of control during the production process. The operation skills and experience are insufficient, and there is a lack of operation manuals, so the key control points during the production process are not well grasped, leading to frequent rolling accidents.

[0047] To solve the rolling accidents and quality problems that occur during the rolling process of thin - gauge fine blanking steel and improve the operation efficiency and profitability of the unit. The embodiments of the present invention provide the above - mentioned solutions. Specifically, in terms of production preparation, for the production of fine blanking steel, the incoming material conditions are confirmed from the convexity, wedge shape, and coiling temperature of the raw materials, and abnormal positions are controlled in advance to avoid rolling accidents. In terms of model load distribution, according to the actual production situation and the characteristics of fine blanking steel, the reduction rate of the last pass is increased. In terms of strip - shape control technology, for the wave - shape problem during the rolling process, the intermediate roll shifting and bending rolls are preset to ensure the strip - shape stability during start - up. In terms of rolling stability control technology, an operation manual is formulated, and a strip - break protection program is added to avoid rolling strip - break accidents.

[0048] Specifically, in terms of production preparation, during the production process of fine blanking steel, the quality control of raw materials is a key link to ensure the quality of the final product. The following is a detailed analysis and control requirements for the raw material characteristics and key parameters in the production process, aiming to prevent rolling accidents, improve production efficiency and product quality through scientific means. It is required that the hot - rolled convexity should be controlled between 40 - 60 microns. Convexity is crucial for rolling stability and strip - shape control. The convexity should be greater than the wedge value to ensure the stability of the strip during rolling and the flatness after forming. The control of the wedge value needs to be adjusted according to specific process requirements, but in principle, it should be less than the convexity value to avoid lateral offset during the rolling process. Although the wedge value is small, it has a direct impact on the final shape and dimensional accuracy of the product. The roll gap needs to be adjusted timely through the hydraulic cylinder magnetic scale to ensure that the wedge value fluctuates within the allowable range. Coiling temperature, the coiling temperature shall not be lower than 50 degrees Celsius. Before loading, conduct a strict edge inspection on each batch of incoming materials, using high - definition cameras or manual visual inspection to ensure that there are no visible cracks, scratches or damages to the naked eye. Once an edge damage is found, immediately mark it near the damaged area with a non - permanent marker pen and immediately notify the main control room, and take measures to reduce the production speed to reduce the impact on the equipment and the possible defective products. Regularly conduct quality awareness and technical training for operators to enhance their sensitivity to raw material quality problems and improve their ability to respond to emergencies. Develop a detailed emergency plan, including emergency shutdown procedures, defective product isolation and handling procedures, to ensure that problems can be responded to quickly and losses can be reduced once they occur.

[0049] Specifically, in terms of model load distribution, during the production process of fine blanking steel, the formulation of the model load distribution strategy needs to be closely combined with the unique properties of this material and the actual production requirements to ensure the stability of the production process and the superiority of product quality. Compared with the rolling process of ordinary products, the production of fine blanking steel faces more complex challenges. Especially in the setting of the reduction rate in the last pass, a more refined control strategy needs to be adopted. The embodiments of the present invention can effectively improve the stability of rolling and reduce the risk of strip breakage accidents caused by abnormal increase in rolling force. In summary, through the optimization of the rolling model load distribution strategy, especially the reasonable adjustment of the reduction rate in the last pass of fine blanking steel, not only the stability of rolling is improved, but also the risk of strip breakage in the production process is significantly reduced, providing a strong guarantee for the high-quality production of fine blanking steel.

[0050] Specifically, in terms of shape control technology, the application and optimization of shape control technology in the rolling process of fine blanking steel. During the rolling process, shape control technology is a key link to ensure product quality and stability. Especially for the waviness problem, its importance is self-evident. Waviness, as a kind of shape defect, seriously affects the surface quality of the strip and its subsequent processing performance. To address this issue, preset intermediate roll shifting and bending roll technologies are widely used in the rolling process to ensure the shape stability during the start-up stage. Challenges in the rolling of fine blanking steel. During the rolling process of fine blanking steel, due to the large rolling force, severe edge waviness often occurs during the start-up stage. The occurrence of this phenomenon is, on the one hand, due to the high strength and deformation resistance of the material itself, and on the other hand, it is closely related to the setting of the rolling model. Traditional setting methods tend to use a smaller amount of roll shifting and increase the bending roll force of the work roll at the same time. However, this setting method will cause the bending roll to quickly reach the limit value after start-up, and due to the slow response of roll shifting at low speed, the shape cannot be adjusted effectively in time, resulting in a shape defect part longer than 100 meters, which has a great impact on the production of the subsequent processing line. To overcome this problem, big data regression analysis and finite element simulation technology can be used to deeply simulate and study the deformation of the strip. Through big data regression, a mathematical model between strip deformation and rolling parameters can be established to predict the deformation trend of the strip under different parameters. Finite element simulation can more intuitively display the stress and strain distribution of the strip during the rolling process and possible shape defects. Based on the results of big data regression and finite element simulation, the embodiments of the present invention propose a new shape control strategy, namely "large roll shifting and small bending roll". The core of this strategy is to quickly respond to shape changes by increasing the amount of roll shifting, and at the same time reduce the bending roll force to avoid it quickly reaching the limit value. By implementing this strategy, not only can the shape defect problem during the start-up stage be effectively solved, but also the stability of rolling and the final quality of the product can be improved.

[0051] Specifically, in terms of rolling stability control technology, work instructions are formulated, and a belt-breaking protection program is added to avoid belt-breaking accidents during rolling. Work instructions are written based on historical accidents. A belt-breaking protection program is added. When the tension deviation is greater than 10%, the rolling mill can be decelerated to the minimum speed, and when the tension deviation is greater than 20%, the rolling mill can automatically stop. The rolling force deviation will automatically reduce speed when it is greater than 500kn, and automatically stop when it is greater than 1000kn. The strip offset will automatically reduce speed when it is greater than 10mm, and automatically stop when it is greater than 20mm. In order to avoid edge cracking and belt breaking, a double-sided wave mode is used for 4 to 5 passes to avoid belt breaking caused by concentrated pressure on the edge.

[0052] It should be noted that based on the monthly output of 100 tons and the performance benefit of 300 yuan per ton of steel, the benefit = 100*12*300=360,000.

[0053] The embodiment of the present invention obtains the operating side tension and driving side tension of the rolling mill when the rolling mill rolls the strip; determines the detection tension deviation of the rolling mill based on the operating side tension and the driving side tension; if the detection tension deviation of the rolling mill is greater than the preset tension deviation threshold, the rolling speed of the rolling mill is lowered based on the detection tension deviation of the rolling mill. When the detection tension deviation of the rolling mill is greater than the preset tension deviation threshold, the force on the strip is uneven to a large extent, and there is a risk of the strip breaking. At this time, the rolling speed of the rolling mill is lowered to avoid the situation where the stress inside the strip is not fully released and adjusted in time, thereby avoiding excessive stress concentration in the local area of ​​the strip, thereby reducing the risk of the strip breaking. Therefore, the qualified rate of the finished strip is improved.

[0054] Based on the same inventive concept, Figure 2 As shown, an embodiment of the present invention provides a rolling control device 10 of a rolling mill, including: a tension acquisition unit 110, used to acquire the operating side tension and the driving side tension of the rolling mill when the rolling mill rolls the strip; a deviation determination unit 120, used to determine the detection tension deviation of the rolling mill based on the operating side tension and the driving side tension; a speed control unit 130, used to reduce the rolling speed of the rolling mill based on the detection tension deviation of the rolling mill if the detection tension deviation of the rolling mill is greater than a preset tension deviation threshold.

[0055] It can be understood that the speed control unit 130 is specifically used to: determine the speed attenuation based on the detected tension deviation of the rolling mill, wherein the greater the detected tension deviation of the rolling mill, the greater the speed attenuation; and reduce the rolling speed of the rolling mill based on the speed attenuation.

[0056] It can be understood that the rolling control device 10 of the rolling mill further includes: a rolling force processing unit for obtaining the operating side rolling force and the driving side rolling force of the rolling mill; determining the detected rolling force deviation of the rolling mill based on the operating side rolling force and the driving side rolling force; if the detected rolling force deviation of the rolling mill is greater than a preset rolling force deviation threshold, reducing the rolling speed of the rolling mill based on the detected rolling force deviation of the rolling mill.

[0057] It can be understood that the rolling control device 10 of the rolling mill further includes: an offset processing unit for obtaining the offset of the strip; if the offset of the strip is greater than a preset offset threshold, reducing the rolling speed of the rolling mill based on the offset of the strip.

[0058] It can be understood that the rolling control device 10 of the rolling mill further includes: a reduction ratio adjustment unit for obtaining the set reduction ratio of each pass in a plurality of passes set for the strip before the rolling mill rolls the strip; increasing the set reduction ratio of the last pass in the plurality of passes and reducing the set reduction ratio of the remaining passes in the plurality of passes to obtain the corrected reduction ratio of each pass in the plurality of passes; wherein, the remaining passes are the passes other than the last pass in the plurality of passes.

[0059] It can be understood that the rolling control device 10 of the rolling mill further includes: a parameter processing unit for obtaining the rolling parameters of the rolling mill in the initial stage of rolling the strip by the rolling mill; predicting the shape defect of the strip based on the rolling parameters; determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill based on the rolling parameters and the shape defect of the strip. Among them, the rolling parameters include the rolling force of the rolling mill. Determining the shifting amount of the intermediate roll and the bending force of the intermediate roll of the rolling mill based on the rolling parameters and the shape defect of the strip includes: if the rolling force of the rolling mill is 5000 kn and the shape defect of the strip is middle wave, the shifting amount of the intermediate roll is 30 mm and the bending force of the intermediate roll is -100 kn; if the rolling force of the rolling mill is 5500 kn and the shape defect of the strip is middle wave, the shifting amount of the intermediate roll is 40 mm and the bending force of the intermediate roll is -50 kn; if the rolling force of the rolling mill is 6000 kn and the shape defect of the strip is middle wave, the shifting amount of the intermediate roll is 60 mm and the bending force of the intermediate roll is -10 kn; if the rolling force of the rolling mill is 7000 kn and the shape defect of the strip is middle wave, the shifting amount of the intermediate roll is 70 mm and the bending force of the intermediate roll is 50 kn.

[0060] Among them, the strip is fine blanking steel, the thickness of the fine blanking steel is less than 0.5 mm, the crown of the fine blanking steel is 40 - 60 microns, the crown of the fine blanking steel is greater than the wedge value of the fine blanking steel, and the coiling temperature of the fine blanking steel is greater than 50 °C.

[0061] It should be understood that for more implementation details of the rolling control device 10 of the rolling mill in the embodiments of the present invention, reference is made to the aforementioned rolling control method of the rolling mill. For the sake of simplicity of the specification, it will not be elaborated herein.

[0062] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, as Figure 3 shown, including a memory 304, a processor 302, and a computer program stored on the memory 304 and executable on the processor 302. The processor 302 executes the program to implement the steps of any implementation manner of the rolling control method embodiment of the rolling mill.

[0063] Among them, in Figure 3 , the bus architecture (represented by the bus 300), the bus 300 may include any number of interconnected buses and bridges. The bus 300 links various circuits including one or more processors represented by the processor 302 and the memory represented by the memory 304 together. The bus 300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art. Therefore, they will not be further described herein. The bus interface 305 provides an interface between the bus 300 and the receiver 301 and the transmitter 303. The receiver 301 and the transmitter 303 may be the same element, that is, a transceiver, which provides a unit for communicating with various other devices on the transmission medium. The processor 302 is responsible for managing the bus 300 and general processing, and the memory 304 may be used to store data used by the processor 302 when executing operations.

[0064] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. In addition, each functional unit may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0065] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0066] The units described as separate components may or may not be physically separated. The components serving as control devices may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0067] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0068] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A rolling control method for a rolling mill, characterized in that: include: When the rolling mill is rolling the strip steel, obtaining the operating side tension and the driving side tension of the rolling mill; Determining a detection tension deviation of the rolling mill based on the operating side tension and the driving side tension; If the detected tension deviation of the rolling mill is greater than a preset tension deviation threshold, the rolling speed of the rolling mill is reduced based on the detected tension deviation of the rolling mill.

2. The rolling control method of a rolling mill according to claim 1, characterized in that: The step of reducing the rolling speed of the rolling mill based on the detected tension deviation of the rolling mill comprises: Determining a speed attenuation amount based on a detected tension deviation of the rolling mill, wherein the greater the detected tension deviation of the rolling mill, the greater the speed attenuation amount; Based on the speed reduction amount, the rolling speed of the rolling mill is reduced.

3. The rolling control method of a rolling mill according to claim 1, characterized in that: Also includes: Obtaining the operating side rolling force and the driving side rolling force of the rolling mill; Determining a detected rolling force deviation of the rolling mill based on the operating side rolling force and the driving side rolling force; If the detected rolling force deviation of the rolling mill is greater than a preset rolling force deviation threshold, the rolling speed of the rolling mill is reduced based on the detected rolling force deviation of the rolling mill.

4. The rolling control method of a rolling mill according to claim 1, characterized in that: Also includes: Obtaining the offset of the steel strip; If the offset of the steel strip is greater than a preset offset threshold, the rolling speed of the rolling mill is reduced based on the offset of the steel strip.

5. The rolling control method of a rolling mill according to claim 1, characterized in that: Before the rolling mill rolls the steel strip, the method further comprises: Obtaining a set reduction rate for each of a plurality of passes set for the strip; Increase the set pressing rate of the last pass among the multiple passes, and decrease the set pressing rate of the remaining passes among the multiple passes to obtain a corrected pressing rate for each pass among the multiple passes; wherein the remaining passes are the passes among the multiple passes except the last pass.

6. The rolling control method of a rolling mill according to claim 1, characterized in that: Also includes: In the initial stage of the rolling mill rolling the steel strip, obtaining rolling parameters of the rolling mill; Based on the rolling parameters, predicting the shape defects of the steel strip; Based on the rolling parameters and the strip shape defects of the steel strip, the intermediate roll shifting amount and the intermediate roll bending force of the rolling mill are determined.

7. The rolling control method of a rolling mill according to claim 6, characterized in that: The rolling parameters include the rolling force of the rolling mill, and determining the intermediate roll shifting amount and the intermediate roll bending force of the rolling mill based on the rolling parameters and the plate shape defects of the strip steel includes: If the rolling force of the rolling mill is 5000 kn, and the strip shape defect is middle wave, the intermediate roll shifting amount is 30 mm, and the intermediate roll bending force is -100 kn; If the rolling force of the rolling mill is 5500 kn, and the strip shape defect is middle wave, the intermediate roll shifting amount is 40 mm, and the intermediate roll bending force is -50 kn; If the rolling force of the rolling mill is 6000 kn, and the strip shape defect is middle wave, the intermediate roll shifting amount is 60 mm, and the intermediate roll bending force is -10 kn; If the rolling force of the rolling mill is 7000 kn, and the plate shape defect of the strip is middle wave, the shifting amount of the intermediate roll is 70 mm, and the bending force of the intermediate roll is 50 kn.

8. The rolling control method of a rolling mill according to any one of claims 1 to 7, characterized in that: The strip steel is fine blanking steel, the thickness of the fine blanking steel is less than 0.5 mm, the convexity of the fine blanking steel is 40-60 μm, the convexity of the fine blanking steel is greater than the wedge value of the fine blanking steel, and the coiling temperature of the fine blanking steel is greater than 50 degrees Celsius.

9. A rolling control device for a rolling mill, characterized in that: include: A tension acquisition unit, used for acquiring the operating side tension and the driving side tension of the rolling mill when the rolling mill is rolling the strip steel; a deviation determination unit, for determining a detection tension deviation of the rolling mill based on the operating side tension and the driving side tension; A speed control unit is used to reduce the rolling speed of the rolling mill based on the detected tension deviation of the rolling mill if the detected tension deviation of the rolling mill is greater than a preset tension deviation threshold.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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