Method and device for controlling surface quality of cold-rolled strip, medium and electronic equipment

Abstract

The application discloses a cold-rolled strip surface quality control method, device, medium and electronic equipment. The method comprises the following steps: acquiring the rolling speed of a fourth rack, judging the rolling speed, and the fourth rack is used for finish rolling of the cold-rolled strip; if the rolling speed of the fourth rack is greater than the expected speed, reducing the corresponding reduction rates of a first rack, a second rack and a third rack, and increasing the corresponding reduction rate of a fifth rack, the first rack, the second rack and the third rack are used for rough rolling of the cold-rolled strip, and the fifth rack is used for rough rolling of the cold-rolled strip; after reducing the corresponding reduction rates of the first rack, the second rack and the third rack and increasing the corresponding reduction rate of the fifth rack, adjusting the corresponding reduction rate of the fourth rack to improve the surface quality of the cold-rolled strip. The technical scheme provided by the application can improve the surface quality of the cold-rolled strip.

Description

Technical Field

[0001] This application belongs to the field of surface quality control technology for cold-rolled strip steel, and particularly relates to a method, device, medium, and electronic equipment for controlling the surface quality of cold-rolled strip steel. Background Technology

[0002] Under current cold rolling technology, the high-speed movement of the mill during the rolling of cold-rolled strip causes a large amount of heat to accumulate on the surface of the strip. This leads to the rupture of the emulsion on the surface of the cold-rolled strip, resulting in black spots and reducing the surface quality of the strip. Therefore, a method to improve the surface quality of cold-rolled strip is needed. Summary of the Invention

[0003] Embodiments of this application provide a method, apparatus, medium, and electronic device for controlling the surface quality of cold-rolled strip steel. The method can improve the surface quality of cold-rolled strip steel and prevent black spots from appearing on the surface of cold-rolled strip steel.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part by practice of this application.

[0005] According to a first aspect of the embodiments of this application, a method for controlling the surface quality of cold-rolled strip steel is provided, characterized in that the method includes: obtaining the rolling speed of a fourth stand for judging the rolling speed, the fourth stand being used for finishing rolling of the cold-rolled strip steel; if the rolling speed of the fourth stand is greater than a desired speed, reducing the reduction ratio corresponding to the first stand, second stand, and third stand, and increasing the reduction ratio corresponding to the fifth stand, the first stand, second stand, and third stand being used for rough rolling of the cold-rolled strip steel, and the fifth stand being used for finishing rolling of the cold-rolled strip steel; after reducing the reduction ratio corresponding to the first stand, second stand, and third stand, and increasing the reduction ratio corresponding to the fifth stand, adjusting the reduction ratio corresponding to the fourth stand to improve the surface quality of the cold-rolled strip steel.

[0006] In some embodiments of this application, based on the foregoing scheme, obtaining the rolling speed of the fourth stand includes: obtaining the reduction ratio corresponding to the fourth stand; and obtaining the rolling speed corresponding to the reduction ratio.

[0007] In some embodiments of this application, based on the foregoing scheme, before reducing the reduction ratios of the first rack, second rack, and third rack, and increasing the reduction ratio of the fifth rack, the method further includes: constructing a control model based on the reduction ratios of each rack, reducing the reduction ratios of the first rack, second rack, and third rack, and increasing the reduction ratio of the fifth rack.

[0008] In some embodiments of this application, based on the foregoing scheme, reducing the compression ratio corresponding to the first rack, the second rack, and the third rack, and increasing the compression ratio corresponding to the fifth rack, includes: determining the adjustment amplitude of the compression ratio corresponding to the first rack, the second rack, the third rack, and the fifth rack according to the desired speed corresponding to the fourth rack and the control model; and reducing the compression ratio corresponding to the first rack, the second rack, and the third rack, and increasing the compression ratio corresponding to the fifth rack according to the adjustment amplitude.

[0009] In some embodiments of this application, based on the foregoing scheme, adjusting the reduction rate corresponding to the fourth stand includes: after reducing the reduction rates corresponding to the first stand, the second stand, and the third stand, determining the remaining reduction amount, wherein the remaining reduction amount is the difference between the total reduction amount and the reduction amounts corresponding to the first stand to the third stand; and adjusting the reduction rate corresponding to the fourth stand according to the remaining reduction amount to ensure that the target thickness of the cold-rolled strip remains unchanged.

[0010] In some embodiments of this application, based on the foregoing scheme, adjusting the reduction ratio corresponding to the fourth stand includes: adjusting the reduction ratio corresponding to the fourth stand according to the control model, the rolling speed corresponding to the fourth stand, and the remaining reduction amount, so as to adjust the reduction ratio corresponding to the fourth stand through the feedback of the rolling speed of the fourth stand.

[0011] In some embodiments of this application, based on the foregoing scheme, the desired speed includes: obtaining the type of emulsion during the stand rolling process to determine the desired speed of the stand according to the different types of emulsions.

[0012] This application adjusts the reduction rates of the first, second, third, and fifth stands by acquiring and determining the rolling speed of the fourth stand. Different rolling speeds result in different heat accumulation on the cold-rolled strip. Excessive heat accumulation can cause the emulsion used in the rolling process to rupture, leading to black spots on the surface of the cold-rolled strip. Therefore, it is necessary to determine the rolling speed of the fourth stand. If the rolling speed of the fourth stand is greater than the desired speed, the reduction rates of the first, second, and third stands are reduced, while the reduction rate of the fifth stand is increased. The desired speed is determined based on the type of emulsion. After reducing the reduction rates of the first, second, and third stands and increasing the reduction rate of the fifth stand, the reduction rate of the fourth stand is adjusted to reduce the rolling speed of the fourth stand, thereby improving the surface quality of the cold-rolled strip. Specifically, the adjustment of the reduction rate of each stand needs to be determined by constructing a control model, which is built by integrating various data from the rolling process. Based on the method described in this application, the reduction rate corresponding to each stand can be adjusted, thereby reducing the reduction rate and rolling speed of the fourth stand, and thus improving the surface quality of the cold-rolled strip.

[0013] According to a second aspect of the embodiments of this application, a device for controlling the surface quality of cold-rolled strip steel is provided, characterized in that the device comprises: an acquisition unit, configured to acquire the rolling speed of a fourth stand for judging the rolling speed, the fourth stand being used for finishing rolling the cold-rolled strip steel; a judgment unit, configured to, if the rolling speed of the fourth stand is greater than a desired speed, reduce the reduction ratio corresponding to the first stand, the second stand, and the third stand, and increase the reduction ratio corresponding to the fifth stand, the first stand, the second stand, and the third stand being used for rough rolling the cold-rolled strip steel, and the fifth stand being used for finishing rolling the cold-rolled strip steel; and an adjustment unit, configured to, after reducing the reduction ratio corresponding to the first stand, the second stand, and the third stand, and increasing the reduction ratio corresponding to the fifth stand, adjust the reduction ratio corresponding to the fourth stand to improve the surface quality of the cold-rolled strip steel.

[0014] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores at least one piece of program code, the at least one piece of program code being loaded and executed by a processor to implement the operations performed by the method.

[0015] According to a fourth aspect of the present application, an electronic device is provided, characterized in that the electronic device includes one or more processors and one or more memories, wherein the one or more memories store at least one piece of program code, the at least one piece of program code being loaded and executed by the one or more processors to implement the operation performed by the method.

[0016] The beneficial effects of the embodiments of the second to fourth aspects described above can be referred to the beneficial effects of the first aspect and the embodiments of the first aspect described above, and will not be repeated here.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 A flowchart of a method for controlling the surface quality of cold-rolled strip steel according to an embodiment of this application is shown;

[0020] Figure 2 A flowchart illustrating the reduction of the compression ratio corresponding to the first rack, the second rack, and the third rack, and the increase of the compression ratio corresponding to the fifth rack in embodiments of this application is shown.

[0021] Figure 3 A flowchart illustrating the adjustment of the reduction rate corresponding to the fourth rack in an embodiment of this application is shown;

[0022] Figure 4 A schematic diagram of the structure of the cold-rolled strip surface quality control device in an embodiment of this application is shown;

[0023] Figure 5 A schematic diagram of the structure of the electronic device in an embodiment of this application is shown;

[0024] Figure 6 A schematic diagram of the control model in an embodiment of this application is shown;

[0025] Figure 7 A flowchart illustrating the reduction rate optimization process in an embodiment of this application is shown;

[0026] Figure 8 A comparison graph of the compression rate versus the desired velocity in an embodiment of this application is shown. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0029] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0030] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0031] The following section will elaborate on this application:

[0032] Figure 1 A flowchart illustrating a method for controlling the surface quality of cold-rolled strip steel according to an embodiment of this application is shown. This method for controlling the surface quality of cold-rolled strip steel can be executed by a device with computational processing capabilities, such as a device for controlling the surface quality of cold-rolled strip steel. (Refer to...) Figure 1 As shown, the method for controlling the surface quality of cold-rolled strip steel includes at least steps 110 to 150, which are described in detail below:

[0033] In step 110, the rolling speed of the fourth stand is obtained to determine the rolling speed. The fourth stand is used for finishing rolling of cold-rolled strip.

[0034] In this application, during the rolling process of cold-rolled strip in the fourth stand, the fourth stand performs work on the cold-rolled strip. It is understood that when the fourth stand performs work on the cold-rolled strip, part of the stand's kinetic energy is converted into heat energy and accumulates on the surface of the cold-rolled strip. The magnitude of this heat energy is related to the kinetic energy of the stand, and also to the rolling force of the stand.

[0035] It should be noted that during the cold-rolling process of cold-rolled strip steel, the emulsion can improve the surface quality of the cold-rolled strip steel. However, excessive heat accumulation on the surface of the cold-rolled strip steel can cause the emulsion to crack, leaving black spots on the surface and reducing the overall quality of the cold-rolled strip steel.

[0036] Therefore, by obtaining the rolling speed of the fourth stand and judging the rolling speed, it can be determined whether the rolling speed of the fourth stand will cause black spots to appear on the surface of the cold-rolled strip.

[0037] In one embodiment of this application, obtaining the rolling speed of the fourth stand may specifically include steps 111 to 112:

[0038] Step 111: Obtain the reduction rate corresponding to the fourth rack.

[0039] Step 112: Obtain the rolling speed corresponding to the reduction ratio.

[0040] In this application, the thickness of the cold-rolled strip is reduced by the work done on it by the stand to achieve the target thickness. The ratio of the thickness reduction (i.e., the difference between the stand entry thickness and the stand exit thickness) to the thickness before the work is done on the cold-rolled strip (i.e., the stand entry thickness) is called the reduction rate.

[0041] For example, the thickness of the cold-rolled strip at the exit of the third stand is 472mm, and the thickness of the cold-rolled strip at the exit of the third stand is 291mm. Therefore, the reduction rate of the third stand can be calculated to be 38.4%.

[0042] For example, the thickness of the cold-rolled strip at the exit of the fourth stand is 291mm, and the thickness of the cold-rolled strip at the exit of the fourth stand is 192mm. Therefore, the reduction rate of the fourth stand can be calculated to be 35.1%.

[0043] It should be noted that in the cold-rolled strip rolling process, the cold-rolled strip first undergoes rough rolling through the first, second, and third stands. Then, it undergoes finish rolling through the fourth and fifth stands to achieve the desired thickness. It can be understood that the exit thickness of the previous stand is the entry thickness of the next stand.

[0044] For example, the exit thickness of the first rack is the entrance thickness of the second rack. The exit thickness of the second rack is the entrance thickness of the third rack. The exit thickness of the third rack is the entrance thickness of the fourth rack. The exit thickness of the fourth rack is the entrance thickness of the fifth rack.

[0045] Meanwhile, the reduction rate corresponds one-to-one with the rolling speed. Therefore, the rolling speed of the stand can be obtained by acquiring the reduction rate of the stand. After acquiring the reduction rate corresponding to the fourth stand, the rolling speed corresponding to the reduction rate can be calculated to determine the rolling speed.

[0046] Continue to refer to Figure 1 In step 130, if the rolling speed of the fourth stand is greater than the desired speed, the reduction rate of the first stand, the second stand, and the third stand is reduced, and the reduction rate of the fifth stand is increased. The first stand, the second stand, and the third stand are used for rough rolling of cold-rolled strip, and the fifth stand is used for finish rolling of cold-rolled strip.

[0047] In this application, after obtaining the rolling speed of the fourth stand, the rolling speed is judged. If the rolling speed is greater than the desired speed, the reduction rate corresponding to the first, second, and third stands is reduced, and the reduction rate corresponding to the fifth stand is increased. The desired speed is the maximum allowable rolling speed of the fourth stand, and it is also the critical speed at which the emulsion breaks down. If the rolling speed of the fourth stand is greater than the desired speed, it indicates that excessive heat has accumulated in the cold-rolled strip during the rolling process, causing the emulsion to break down and black spots to form on the surface of the cold-rolled strip. Therefore, after determining that the rolling speed of the fourth stand is greater than the desired speed... It can reduce the reduction rate of the first, second, and third stands, while increasing the reduction rate of the fifth stand, thereby reducing the reduction rate of the fourth stand and thus reducing the rolling speed of the fourth stand. This can prevent the emulsion from cracking due to the high-speed rolling of the stands and can also prevent the formation of black spots on the surface of the cold-rolled strip, thereby improving the surface quality of the cold-rolled strip.

[0048] It should be noted that black spots on the surface of cold-rolled strip only occur on the fourth or fifth stand. If black spots appear after the cold-rolled strip has been rolled on the fifth stand, the concentration of the emulsion in the fifth stand needs to be increased to prevent the formation of black spots.

[0049] In one embodiment of this application, before reducing the reduction ratios corresponding to the first rack, the second rack, and the third rack, and increasing the reduction ratio corresponding to the fifth rack, step 131 may be included:

[0050] Step 131: Based on the reduction rate of each rack, construct a control model to reduce the reduction rate of the first rack, the second rack, and the third rack, and increase the reduction rate of the fifth rack.

[0051] In this application, a control model is constructed by combining the analysis of the reduction rate of each stand. Through this control model, the reduction rates of the first, second, and third stands can be reduced, while the reduction rate of the fifth stand can be increased, thereby reducing the reduction rate of the fourth stand and consequently lowering the rolling speed of the fourth stand. Furthermore, this prevents the formation of black spots on the surface of the cold-rolled strip and improves the surface quality of the cold-rolled strip.

[0052] For details, please refer to Figure 6 , Figure 6 A schematic diagram of the control model in an embodiment of this application is shown. Figure 6 In this process, a control model is constructed using dynamic and structural parameters. This control model includes a stand structure dynamic model and a rolling process parameter model. By incorporating the dynamic and structural parameters into the control model, dynamic process parameters and dynamic force-energy parameters can be obtained, which are used to control the stand's rolling of the cold-rolled strip and adjust the corresponding reduction rate of the stand.

[0053] For example, by using the control model, by reducing the reduction rate of the first stand by 3.9%, the reduction rate of the second stand by 2.7%, the reduction rate of the third stand by 2.5%, the reduction rate of the fourth stand by 3.1%, and increasing the reduction rate of the fifth stand by 12.4%, the black spots appearing on the fourth stand of the cold-rolled strip are eliminated, thereby improving the surface quality of the cold-rolled strip.

[0054] It should be noted that the construction of the control model needs to consider not only the reduction rate of each rack, but also other factors.

[0055] For example, consider the emulsion used during the rolling process. By controlling the emulsion temperature to 55℃–60℃, and simultaneously controlling the emulsion concentrations in boxes S1 and S2 to 3.0%–3.5% and 5.5%–7.0%, respectively, the emulsion in box S1 is used for emulsifying the cold-rolled strip at low speeds on the stand before emulsification. The emulsion in box S2 is used for emulsifying the cold-rolled strip at high speeds on the stand after emulsification. By controlling the concentration and temperature of the emulsion, the incidence of surface defects in the cold-rolled strip can be reduced.

[0056] Additionally, an extreme pressure additive containing 1% phosphorus can be added to the emulsion, wherein the addition ratio can be 0.1%. By adding the additive to the emulsion, the compressive strength of the emulsion can be increased and the demulsification ability of the emulsion can be reduced.

[0057] Understandably, if the oil film of the emulsion adhering to the surface of the cold-rolled strip is too thick (i.e., the coefficient of friction is too low), it cannot effectively transmit the rolling torque, resulting in localized overheating on the stand surface. This causes the emulsion and iron powder to mix, leading to black spot defects on the surface of the cold-rolled strip. If the oil film is too thin (i.e., the coefficient of friction is too high), the oil film may rupture locally on the cold-rolled strip, causing the work rolls of the stand to come into contact with the cold-rolled strip, resulting in an increase in the area of ​​black spots on the surface of the cold-rolled strip. The state of the emulsion is affected by the stand rolling temperature, stand rolling speed, emulsion parameters, the cold-rolled strip, and many other factors.

[0058] In one embodiment of this application, the reduction of the compression ratio corresponding to the first rack, the second rack, and the third rack, and the increase of the compression ratio corresponding to the fifth rack can be performed as follows: Figure 2 The steps are shown.

[0059] See Figure 2 This document illustrates a flowchart illustrating the reduction of the compression ratios corresponding to the first rack, second rack, and third rack, and the increase of the compression ratio corresponding to the fifth rack, according to embodiments of this application. Specifically, it includes steps 210 to 230:

[0060] Step 210: Based on the desired speed corresponding to the fourth frame and the control model, determine the adjustment amplitude of the reduction rate corresponding to the first frame, second frame, third frame, and fifth frame.

[0061] Step 230: Based on the adjusted amplitude, reduce the reduction ratio corresponding to the first rack, the second rack, and the third rack, and increase the reduction ratio corresponding to the fifth rack.

[0062] In this application, after obtaining the rolling speed of the fourth stand and the control model, based on the calculation and analysis of the model, when the rolling speed of the fourth stand exceeds the desired speed, the adjustment range of the reduction rate corresponding to the first stand, second stand, third stand, and fifth stand is calculated. After obtaining the adjustment range, the reduction rate corresponding to the first stand, second stand, and third stand is reduced, and the reduction rate corresponding to the fifth stand is increased, thereby adjusting the reduction rate of the fourth stand.

[0063] For example, refer to Figure 7 , Figure 7 A flowchart illustrating the reduction rate optimization process in an embodiment of this application is shown. Figure 7First, initial parameter values ​​are acquired and / or set. These initial parameter values ​​may include the parameters of the stand, the parameters of the cold-rolled strip, and the parameters of the emulsion. After acquiring the initial parameter values, they are written into the initial control model, and the parameter values ​​corresponding to achieving the target reduction rate for each stand are calculated. Based on the calculated parameter values, the optimized reduction rate values ​​for each stand are obtained by performing a set number of calculations, thus determining the reduction rate adjustment range for the first, second, third, and fifth stands.

[0064] It should be noted that if the set number of calculations is not reached and the calculation is restarted, a genetic algorithm can be used for recalculation. Based on this genetic algorithm, the optimal fit can be calculated, that is, the optimal adjustment range of the reduction rate for each stand can be obtained to improve the surface quality of the cold-rolled strip.

[0065] Continued reference Figure 1 In step 150, after reducing the reduction rate corresponding to the first stand, the second stand, and the third stand, and increasing the reduction rate corresponding to the fifth stand, the reduction rate corresponding to the fourth stand is adjusted to improve the surface quality of the cold-rolled strip.

[0066] In this application, after adjusting the reduction ratios corresponding to the first, second, and third stands, and increasing the reduction ratio corresponding to the fifth stand, the reduction ratio corresponding to the fourth stand is adjusted. By adjusting the reduction ratio of the fourth stand, the rolling speed corresponding to the fourth stand is adjusted. For details, please refer to... Figure 8 , Figure 8 A comparison graph of compression rate versus desired velocity in an embodiment of this application is shown. (Refer to...) Figure 8 In the diagram, F1-F3 correspond to the first stand, the second stand, and the third stand, respectively. F4 corresponds to the fourth stand. The reduction rates of F1-F3 refer to the reduction rates of the cold-rolled strip during rolling on the first to third stands.

[0067] Taking a reduction rate of 90% for F1-F3 as an example, if the initial thickness of the cold-rolled strip is 1760mm, the thickness becomes 176mm after rolling from the first stand to the third stand, that is, the reduction rate of rolling from the first stand to the third stand is 90%.

[0068] in, Figure 8 The desired speed of the fourth rack can be obtained from Equation 1:

[0069] v rc，4 (h)=0.9849×10 9 h 2 -0.8407×10 6 h+1.9270×102 (m / s) Equation 1

[0070] Equation 1 is obtained by fitting experimental data of cold-rolled strip steel. It can obtain the maximum rolling speed of the stand according to different stand reduction amounts, that is, the critical value of emulsion rupture, wherein the reduction amount corresponds one-to-one with the reduction rate.

[0071] Therefore, according to Figure 8 The comparison diagram shown allows for the selection of a suitable reduction rate as the reduction rate of the fourth stand, thereby adjusting the reduction rate corresponding to the fourth stand to improve the surface quality of the cold-rolled strip.

[0072] In one embodiment of this application, the desired speed may specifically include step 151:

[0073] Step 151: Obtain the type of emulsion during the stand rolling process to determine the desired stand speed based on the type of emulsion.

[0074] In this application, there are many types of cold-rolled strip steel and emulsions, and different cold-rolled strip steels require different emulsions. Different emulsions correspond to different desired speeds. Therefore, it is necessary to select the appropriate emulsion based on the different types of cold-rolled strip steel and the parameters of the emulsion, as detailed in Table 1:

[0075]

[0076] Table 1

[0077] Referring to Table 1, the yield strength of the steel grade characterizes the ease with which cold-rolled strip steel deforms; the smaller the value, the easier it is to deform. The S1 concentration emulsion is used for cold-rolled strip steel at low speeds on the pre-emulsification stand. The S2 concentration emulsion is used for cold-rolled strip steel at high speeds on the post-emulsification stand.

[0078] In one embodiment of this application, adjusting the reduction ratio corresponding to the fourth rack can be performed as follows: Figure 3 The steps are shown.

[0079] See Figure 3 This document illustrates a flowchart of adjusting the reduction ratio corresponding to the fourth rack in an embodiment of this application. Specifically, it includes steps 310 to 330:

[0080] Step 310: After reducing the reduction rates of the first rack, the second rack, and the third rack, determine the remaining reduction amount, which is the difference between the total reduction amount and the reduction amounts corresponding to the first rack to the third rack.

[0081] Step 330: Adjust the reduction rate corresponding to the fourth stand according to the remaining reduction amount to ensure that the target thickness of the cold-rolled strip remains unchanged.

[0082] In this application, to ensure that the target thickness of the cold-rolled strip remains constant, it is necessary to obtain the remaining reduction, which is the sum of the reductions corresponding to the fourth and fifth stands, in order to adjust the reduction rate of the fourth stand based on the remaining reduction. For example, if the initial thickness of the cold-rolled strip is 1760 mm and the target thickness is 170 mm, and the reduction from the first to the third stand is 90.3%, then after rolling from the first to the third stand, the thickness of the cold-rolled strip is 176 mm. Therefore, the reduction corresponding to the fourth and fifth stands is 9.7%, thus the reduction rate corresponding to the fourth to the fifth stand can be obtained as 3.4%, and the reduction rate of the fourth stand can be adjusted based on the reduction rate corresponding to the fourth to the fifth stand. Here, the reduction is the ratio of the thickness change (i.e., the difference between the stand inlet thickness and the stand outlet thickness) to the stand inlet thickness.

[0083] In one embodiment of this application, adjusting the reduction ratio corresponding to the fourth rack may specifically include step 331:

[0084] Step 331: Based on the control model, the rolling speed corresponding to the fourth stand, and the remaining reduction amount, adjust the reduction rate corresponding to the fourth stand, so as to adjust the reduction rate corresponding to the fourth stand through the feedback of the rolling speed of the fourth stand.

[0085] In this application, after adjusting the reduction rate of the fourth stand according to the control model, the rolling speed of the fourth stand, and the remaining reduction, the fourth stand will obtain a new rolling speed. If black spots still appear on the surface of the cold-rolled strip after rolling at the new rolling speed, the reduction rate of the fourth stand will be adjusted according to the feedback of the new rolling speed to improve the surface quality of the cold-rolled strip. Referring to Tables 2 and 3, the data before and after the reduction rate adjustment can be clearly seen.

[0086] Table 2 shows the data for rack 4 with black spots, and Table 3 shows the data for rack 4 without black spots. From Tables 2 and 3, we can see that in Table 2, the reduction rate for rack 1 is 49.7%, for rack 2 it is 46.7%, for rack 3 it is 38.4%, for rack 4 it is 35.1%, and for rack 5 it is 11.3%. In Table 3, the reduction rate for rack 1 is 45.8%, for rack 2 it is 44.0%, for rack 3 it is 35.9%, for rack 4 it is 32.0%, and for rack 5 it is 23.7%.

[0087] Therefore, by reducing the reduction rate of the first stand by 3.9%, the reduction rate of the second stand by 2.7%, the reduction rate of the third stand by 2.5%, the reduction rate of the fourth stand by 3.1%, and increasing the reduction rate of the fifth stand by 12.4%, the black spots appearing on the fourth stand of the cold-rolled strip are eliminated, thereby improving the surface quality of the cold-rolled strip.

[0088]

[0089] Table 2

[0090]

[0091] Table 3

[0092] This application adjusts the reduction rates of the first, second, third, and fifth stands by acquiring and determining the rolling speed of the fourth stand. Different rolling speeds result in different heat accumulation on the cold-rolled strip. Excessive heat accumulation can cause the emulsion used in the rolling process to rupture, leading to black spots on the surface of the cold-rolled strip. Therefore, it is necessary to determine the rolling speed of the fourth stand. If the rolling speed of the fourth stand is greater than the desired speed, the reduction rates of the first, second, and third stands are reduced, while the reduction rate of the fifth stand is increased. The desired speed is determined based on the type of emulsion. After reducing the reduction rates of the first, second, and third stands and increasing the reduction rate of the fifth stand, the reduction rate of the fourth stand is adjusted to reduce the rolling speed of the fourth stand, thereby improving the surface quality of the cold-rolled strip. Specifically, the adjustment of the reduction rate of each stand needs to be determined by constructing a control model, which is built by integrating various data from the rolling process. Based on the method described in this application, the reduction rate corresponding to each stand can be adjusted, thereby reducing the reduction rate and rolling speed of the fourth stand, and thus improving the surface quality of the cold-rolled strip.

[0093] Based on the same inventive concept, this application also provides a device for controlling the surface quality of cold-rolled strip steel, referring to... Figure 4This diagram illustrates a structural schematic of a device for controlling the surface quality of cold-rolled strip steel according to an embodiment of this application. The control device 400 includes: an acquisition unit 401, used to acquire the rolling speed of a fourth stand for judging the rolling speed, the fourth stand being used for finishing rolling the cold-rolled strip steel; a judgment unit 403, used to reduce the reduction ratios corresponding to the first, second, and third stands and increase the reduction ratio corresponding to the fifth stand if the rolling speed of the fourth stand is greater than a desired speed, the first, second, and third stands being used for rough rolling the cold-rolled strip steel, and the fifth stand being used for finishing rolling the cold-rolled strip steel; and an adjustment unit 403, used to adjust the reduction ratio corresponding to the fourth stand after reducing the reduction ratios corresponding to the first, second, and third stands and increasing the reduction ratio corresponding to the fifth stand, to improve the surface quality of the cold-rolled strip steel.

[0094] For details not disclosed in the device embodiments of this application, please refer to the embodiments of the methods described above in this application.

[0095] Based on the same inventive concept, this application also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to implement the operation performed by the method.

[0096] Based on the same inventive concept, this application also provides an electronic device, referring to... Figure 5 , Figure 5 A schematic diagram of the structure of an electronic device in an embodiment of this application is shown.

[0097] The electronic device includes one or more memories 504, one or more processors 502, and at least one computer program (program code) stored in the memory 504 and executable on the processor 502, wherein the processor 502 executes the computer program to implement the method described above.

[0098] Among them, Figure 5In this document, a bus architecture (represented by bus 500) is used. Bus 500 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 can be used to store data used by processor 502 during operation.

[0099] 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 as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application 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, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0100] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0101] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0102] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the 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 cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0103] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for controlling the surface quality of cold-rolled strip steel, characterized in that, The method includes: The rolling speed of the fourth stand is obtained to determine the rolling speed, and the fourth stand is used for finishing rolling of cold-rolled strip steel; If the rolling speed of the fourth stand is greater than the desired speed, the reduction rate of the first stand, the second stand, and the third stand is reduced, and the reduction rate of the fifth stand is increased. The first stand, the second stand, and the third stand are used for rough rolling of cold-rolled strip, and the fifth stand is used for finish rolling of cold-rolled strip. After reducing the reduction rates of the first stand, the second stand, and the third stand, and increasing the reduction rate of the fifth stand, the reduction rate of the fourth stand is adjusted to improve the surface quality of the cold-rolled strip. The process of obtaining the rolling speed of the fourth stand includes: Obtain the reduction rate corresponding to the fourth rack; Based on the reduction ratio, obtain the rolling speed corresponding to the reduction ratio; Before reducing the reduction ratios of the first rack, the second rack, and the third rack, and increasing the reduction ratio of the fifth rack, the method further includes: constructing a control model based on the reduction ratios of each rack, reducing the reduction ratios of the first rack, the second rack, and the third rack, and increasing the reduction ratio of the fifth rack; The reduction of the compression ratio corresponding to the first rack, the second rack, and the third rack, and the increase of the compression ratio corresponding to the fifth rack, include: Based on the desired speed corresponding to the fourth frame and the control model, determine the adjustment range of the reduction rate corresponding to the first frame, second frame, third frame and fifth frame; Based on the aforementioned adjustment amplitude, the reduction ratio corresponding to the first rack, the second rack, and the third rack is reduced, while the reduction ratio corresponding to the fifth rack is increased. The adjustment of the reduction ratio corresponding to the fourth frame includes: After reducing the reduction rate corresponding to the first rack, the second rack, and the third rack, the remaining reduction amount is determined. The remaining reduction amount is the difference between the total reduction amount and the reduction amount corresponding to the first rack to the third rack. Based on the remaining reduction amount, adjust the reduction rate corresponding to the fourth stand to ensure that the target thickness of the cold-rolled strip remains unchanged; The adjustment of the reduction ratio corresponding to the fourth frame includes: Based on the control model, the rolling speed corresponding to the fourth stand, and the remaining reduction amount, the reduction rate corresponding to the fourth stand is adjusted so as to adjust the reduction rate corresponding to the fourth stand through the feedback of the rolling speed of the fourth stand.

2. The method according to claim 1, characterized in that, The desired speed includes: The type of emulsion used in the stand rolling process is determined to determine the desired stand speed based on the type of emulsion.

3. A device for controlling the surface quality of cold-rolled strip steel, used to implement the method for controlling the surface quality of cold-rolled strip steel as described in claim 1 or 2, characterized in that, The device includes: An acquisition unit is used to acquire the rolling speed of the fourth stand in order to determine the rolling speed. The fourth stand is used to perform fine rolling on cold-rolled strip. The judgment unit is used to reduce the reduction rate of the first, second, and third stands and increase the reduction rate of the fifth stand if the rolling speed of the fourth stand is greater than the expected speed. The first, second, and third stands are used for rough rolling of cold-rolled strip steel, and the fifth stand is used for finish rolling of cold-rolled strip steel. The adjustment unit is used to adjust the reduction rate of the fourth stand after reducing the reduction rate of the first stand, the second stand, and the third stand, and increasing the reduction rate of the fifth stand, so as to improve the surface quality of the cold-rolled strip.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to perform the operations described in claim 1 or 2.

5. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation performed by the method as described in claim 1 or 2.

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