Rolling schedule adjusting method and device for eighteen-high rolling mill facing asymmetric strip shape defects

Abstract

The invention provides a rolling schedule adjusting method and device for an eighteen-high rolling mill facing asymmetric strip shape defects. The method comprises the steps that current cold rolling production data of the eighteen-high rolling mill and typical asymmetric strip shape defect data prone to occurring are obtained; on the basis of typical asymmetric plate shape defect data prone to occurring, the relation between the asymmetric plate shape degree and basic control parameters of cold rolling production is obtained according to current cold rolling production data, and the basic control parameters comprise quality regulation parameters and rolling schedule parameters; and according to the asymmetric strip shape degree and the relation between the asymmetric strip shape degree and the basic control parameters of cold rolling production, rolling schedule parameters are adjusted so as to coordinate the deformation difference of each section of the strip steel. In order to solve the problem of asymmetric strip shape defects of an existing eighteen-roller rolling mill, the rolling process of the eighteen-roller single-stand rolling mill is optimized, the asymmetric strip shape defect regulation and control capacity can be achieved, and the strip shape state of rolled strip steel is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of eighteen-roll single-frame cold rolling mills, and in particular relates to a method and device for adjusting the rolling schedule of an eighteen-roll rolling mill for asymmetric plate shape defects. Background Art

[0002] As a strong rolling mill for thin strips, the 18-high mill has the characteristics of small roll diameter and strong thinning, and can be applied to the rolling production of non-ferrous metals, stainless steel, electrical steel, automotive plates and other products. However, due to the large roll deflection constraint under its small roll diameter, the 18-high mill is prone to high-order roll deflection, the roll gap shape control ability is weakened, and the rolled strip presents asymmetric plate shape defects. If the strip with asymmetric plate shape passes through the post-process unit, it is very easy to deviate in the subsequent galvanizing and continuous annealing units, affecting the quality of the plate, and even causing the production line to stop. Then, the roll system of the 18-high mill adopts a roll layout strategy with a large roll diameter gradient. The ratio of its support rolls, intermediate rolls and working rolls is much larger than 1 to 2 of conventional models, and the working rolls are in a floating state due to the small roll diameter, making it difficult to improve the mill roll gap shape control ability through roll shape.

[0003] Regarding such technical issues, the industry has successively proposed means such as roll shape development, machine model modification, rolling process design, and adding asymmetric plate shape defect processing procedures. In terms of roll shape design and development, according to the plate shape defect characteristics generated by the target machine model, the work roll shape is developed, or the intermediate roll shape is developed and combined with the bending and shifting roll strategy to achieve the purpose of asymmetric plate shape defect treatment in the form of combined development; in the machine model modification method, the roll system layout of the target machine model is coordinated to narrow the roll diameter gap, thereby improving the roll stiffness and enhancing the plate shape control ability of the unit; in terms of rolling process design, according to the size specifications of the strip to be rolled, the steel grade, the product post-process processing requirements and other factors, the rolling reduction rate of each pass is redistributed, thereby coordinating the relationship between the plastic deformation of the rolled piece and the insufficient machine stiffness; in terms of adding asymmetric plate shape defect processing procedures, the rolled steel coil is sent to the flattening unit production line, and a flattening process is added to weaken the asymmetric plate shape defects, thereby providing base materials for the post-process. The above methods and measures have achieved certain results in different units, but they are difficult to be directly applied to the 18-high mill due to the characteristics of the 18-high mill. First, the roll diameter gradient of the 18-high mill is large, and the design and development of the work roll and intermediate roll shapes are difficult to compensate for the stiffness defects. In addition, the single plate shape control method caused by the floating roll of the work roll also constrains the adjustment of the bending roll strategy. Second, the 18-high mill is different from the traditional four- and six-high mills. Its main roll system inherits the characteristics of the four- and six-high mills, but in order to constrain its small-diameter work rolls, four sets of side support rolls are added on the entrance and exit sides. At this time, the machine model is complex and relatively regulated, and it is difficult to transform the machine model. Third, the single rolling process design is also limited by the characteristics of its unit. It is still difficult to coordinate its asymmetric plate shape problem by only redistributing the reduction rate of each pass. Fourth, although the addition of the leveling process can slightly improve the asymmetric plate shape problem, the excessive force and energy demand for leveling often exceeds the limit of the leveling mill, and the investment in the leveling process is easy to increase the production cost of strip steel and promote the production inversion phenomenon.

[0004] Therefore, it is urgent to propose a method for treating asymmetric plate shape defects according to the characteristics of the roll system of the 18-high rolling mill to ensure stable plate flow and efficient production in the purchase process. Summary of the invention

[0005] The main purpose of the embodiment of the present invention is to provide a method and device for adjusting the rolling schedule of an eighteen-roll rolling mill for asymmetric plate shape defects, to optimize the rolling schedule of the eighteen-roll single-frame rolling mill, to have the ability to regulate asymmetric plate shape defects, so that the plate shape of the strip after rolling is greatly improved, and to solve the problems in the prior art caused by large deflection constraints of the rolling rollers, serious plate shape defects after rolling, poor production stability and difficulty in ensuring the quality of the subsequent process.

[0006] In a first aspect, a rolling procedure adjustment method for an 18-roll mill for asymmetric plate shape defects is provided, the method comprising: obtaining current cold rolling production data of the 18-roll mill and data of typical asymmetric plate shape defects that are prone to occur; obtaining the relationship between the degree of asymmetric plate shape and basic control parameters of cold rolling production based on the data of typical asymmetric plate shape defects that are prone to occur according to the current cold rolling production data, the basic control parameters comprising product specification parameters and rolling procedure parameters; adjusting the rolling procedure parameters according to the degree of asymmetric plate shape and the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0007] In another possible implementation, the current cold rolling production data includes but is not limited to: the specifications of the produced strip, the yield strength of the steel grade to be rolled, the surface quality requirements of the target product, the reduction rate of each pass, the flatness data of each channel of the flatness meter, and the tension before and after each pass; wherein the specifications of the produced strip include the steel grade, plate width, and plate thickness of the strip; typical asymmetric plate shape defect data include but are not limited to: typical asymmetric plate shape type, corresponding specifications, corresponding roll number and asymmetric plate shape defect length, wherein typical asymmetric plate shape types include single-side wave, single-rib wave, and offset middle wave.

[0008] In a possible implementation, based on typical asymmetric flatness defect data that is prone to occur, the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production is obtained according to the current cold rolling production data, including: according to the coil number of the steel coil as the index, the strip specification parameters, rolling procedure parameters, the type of asymmetric flatness defect generated, the length of asymmetric flatness defect, and the flatness data of each channel of the flatness meter are extracted in sequence; the basic control parameters, including the process detection data of each channel data of the flatness meter, the correspondence between each parameter and the type of asymmetric flatness defect of the strip is statistically analyzed, the influence of the basic control parameters on the degree of asymmetric flatness, and the readings of each channel of the flatness meter are determined, and the indications of each channel of the flatness meter are obtained.

[0009] In another possible implementation, the readings of each channel of the shape meter are obtained, including fitting each section of the rolled strip according to the full-length shape distribution law according to the following relationship to obtain the readings of each channel of the shape meter:

[0010] h(x)=a4x 4 +a2x 2 +a1x+a0

[0011] Among them, x is the strip width, a0-a4 are the fitting curve coefficients; at the same time, the full-length distribution function a1(x) of the first-order coefficient a1 is obtained.

[0012] In another possible implementation, the rolling procedure parameters are adjusted according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production, including: if any strip has a relatively serious asymmetric flatness defect after rolling, it is determined that the strip has a risk of deviation; if the yield strength of the strip is low after work hardening and the surface quality requirement of the cold-hardened coil is low, a new rolling pass with a preset range of reduction rate is added at the end of rolling; if the reduction rate of the newly added pass after adjustment is higher than the reduction rate of the second pass from the end after adjustment, the original reduction rate of the last pass is restored, and the reduction rate is taken from the original second pass from the end; if there is no high surface quality requirement for the cold-hardened coil, the reduction rate allocation of the newly added pass at the end is replaced by increasing the roughness of the working roll.

[0013] In another possible implementation, a new rolling pass with an increased reduction rate at the last rolling pass includes: if the yield strength σ of the original last rolling pass is greater than or equal to 900MPa, the reduction rate of the new pass is defined as approximately 3%; if the yield strength σ of the original last rolling pass is greater than or equal to 600MPa and less than 900MPa, the reduction rate of the new pass is defined as approximately 4%; if the yield strength σ of the original last rolling pass is less than 600MPa and greater than or equal to 300MPa, the reduction rate of the new pass is defined as approximately 5%; if the yield strength σ of the original last rolling pass is less than 300MPa, the reduction rate of the new pass is defined as approximately 6%.

[0014] In another possible implementation, the roughness of the working roll is increased to replace the allocation of the reduction rate of the last newly added pass, including: if the difference in the plate shape value of the strip after the last rolling pass is greater than 40I under the original rolling procedure, the surface roughness of the working roll can be increased to 1.2, and a new rolling pass with a reduction rate within a preset range is added at the last rolling pass; if the difference in the plate shape value of the strip after the last rolling pass is greater than 80I under the original rolling procedure, the surface roughness of the working roll is increased to 1.4, and a new rolling pass with a reduction rate within a preset range is added at the last rolling pass.

[0015] In the second aspect, a rolling procedure adjustment device for an 18-roll mill facing asymmetric plate shape defects is provided, the device comprising: a data acquisition module, used to acquire the current cold rolling production data of the 18-roll mill and data of typical asymmetric plate shape defects that are prone to occur; a relationship acquisition module, used to acquire the relationship between the degree of asymmetric plate shape and basic control parameters of cold rolling production based on the data of typical asymmetric plate shape defects that are prone to occur according to the current cold rolling production data, the basic control parameters including product specification parameters and rolling procedure parameters; a parameter adjustment module, used to adjust the rolling procedure parameters according to the degree of asymmetric plate shape and the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0016] According to a third aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for adjusting the rolling procedure of an eighteen-roll mill for asymmetric plate shape defects as provided in the first aspect is implemented.

[0017] In a fourth aspect, a non-transitory computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, a rolling procedure adjustment method for an eighteen-roll mill for asymmetric plate shape defects as provided in the first aspect is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in describing the embodiments of the present application are briefly introduced below.

[0019] Figure 1 A flowchart of a method for adjusting the rolling schedule of an 18-high rolling mill for asymmetric plate shape defects provided by one embodiment of the present invention;

[0020] Figure 2 A structural diagram of a rolling schedule adjustment device for an 18-high rolling mill for asymmetric plate shape defects provided by one embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the physical structure of an electronic device provided by the present invention.

[0022] Specific implementation method

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present invention.

[0024] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, modules, components and / or groups thereof. It should be understood that when we refer to a module as being "connected" or "coupled" to another module, it may be directly connected or coupled to the other modules, or there may be intermediate modules. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any modules and all combinations of one or more associated listed items.

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation method of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0026] The technical solution of the present application and how to solve the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0027] As a strong rolling mill for thin strips, the eighteen-roll mill has the characteristics of small roller diameter and strong thinning, and can be applied to the rolling production of non-ferrous metals, stainless steel, electrical steel, automotive plates and other products. Due to the large roller deflection constraint under its small roller diameter, the eighteen-roll mill is prone to high-order roller deflection, the roller gap shape control ability is weakened, and the strip after rolling presents asymmetric plate shape defects. If the strip with asymmetric plate shape is passed through the post-process unit, it is very easy to deviate in the subsequent galvanizing and annealing units, affecting the quality of the plate passing and even causing the production line to stop. Therefore, there is an urgent need for asymmetric plate shape defect control methods targeting the roller system characteristics of the eighteen-roll mill to ensure stable plate passing and efficient production in the purchase process.

[0028] like Figure 1 The figure shows a flow chart of a method for adjusting the rolling schedule of an 18-high rolling mill for asymmetric plate shape defects provided by one embodiment of the present invention, the method comprising:

[0029] Step S11, obtaining the current cold rolling production data of the 18-high rolling mill and the data of typical asymmetric plate shape defects that are prone to occur.

[0030] Specifically, investigate the current icing situation and icing equipment of the substation to be evaluated, as well as the meteorological information for the next 15 days, including temperature, humidity, climate, etc. At the same time, collect recent UV detection graphs and data. The icing equipment in this application is mainly post insulators, preferably 220 kV post insulators. Of course, in other embodiments of the present invention, it can also be other equipment in the substation to be evaluated, and this is not specifically limited. There will be patrol personnel in the substation, and the icing situation of the post insulators will be reported if the equipment is seriously iced.

[0031] Step S12, based on typical asymmetric plate shape defect data that is prone to occur, the relationship between the degree of asymmetric plate shape and basic control parameters of cold rolling production is obtained according to current cold rolling production data, and the basic control parameters include product specification parameters and rolling procedure parameters.

[0032] Step S13, adjusting the rolling procedure parameters according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0033] The embodiment of the present invention adjusts the rolling procedure of the eighteen-roll rolling mill for asymmetric plate shape defects. In view of the asymmetric plate shape defect problem of the existing eighteen-roll rolling mill, the rolling process of the eighteen-roll single-stand rolling mill is optimized, and the asymmetric plate shape defect regulation capability is achieved, so that the plate shape of the strip after rolling is greatly improved.

[0034] In an embodiment of the present invention, the current cold rolling production data includes but is not limited to: the specifications of the produced strip, the yield strength of the steel grade to be rolled, the surface quality requirements of the target product, the reduction rate of each pass, the flatness data of each channel of the flatness meter, the tension before and after each pass, etc.; among which the specifications of the produced strip include the steel grade, plate width, plate thickness, etc. of the strip.

[0035] Typical asymmetric plate shape defect data include but are not limited to: typical asymmetric plate shape types, corresponding product specifications, corresponding roll numbers and asymmetric plate shape defect lengths, etc., among which typical asymmetric plate shape types include single-side waves, single-rib waves, offset middle waves, etc.

[0036] In step S12, firstly, the steel type of the steel coil is used to match its yield strength and the surface quality of the target product. Optionally, according to the steel coil number of the steel coil, the strip gauge parameters, rolling procedure parameters, the type of asymmetric plate shape defects generated, the length of asymmetric plate shape defects, and the plate shape data of each channel of the plate shape meter are extracted in sequence. Among them, the strip gauge parameters include plate width, plate thickness, etc., and the rolling procedure parameters include the reduction rate of each pass, the tension before and after each pass, etc.

[0037] Then, the basic control parameters, including the process detection data of each channel data of the shape meter, are used to statistically analyze the corresponding relationship between each parameter and the type of asymmetric shape defect of the strip, determine the influence of the basic control parameters on the degree of asymmetric shape, and obtain the numerical performance of each channel of the shape meter. Optionally, the full-length distribution function a1(x) of the first-order coefficient a1 is obtained;

[0038] According to the full-length strip shape distribution law, each section of the rolled strip is fitted according to the following relationship to obtain the readings of each channel of the strip shape meter:

[0039] h(x)=a4x 4 +a2x 2 +a1x+a0

[0040] Among them, x is the strip width, and a0-a4 are the fitting curve coefficients.

[0041] At the same time, the full-length distribution function a1(x) of the first-order coefficient a1 is obtained.

[0042] In step S13, the rolling procedure parameters are adjusted according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production. Optionally, if any strip steel has a relatively serious asymmetric flatness defect after rolling, it is determined that the strip steel has a hidden danger of deviation, that is, it is easy to have deviation problems in the subsequent process.

[0043] If the yield strength of the strip after work hardening is low and the surface quality requirements of the cold hardened coil are low, a new rolling pass with a preset range of reduction rate is added in the last rolling pass. The preset range of the reduction rate of the new rolling pass is preferably 3-6%, and the allocation is derived from the original last rolling pass. Optionally, the range of the yield strength of the strip after work hardening is determined, and the specific range is shown in Table 1 below.

[0044] Table 1 Yield strength range

[0045]

[0046] The reduction ratio distribution of the additional passes can be determined as follows:

[0047] If the yield strength σ of the original last rolling pass is greater than or equal to 900MPa, the reduction rate of the new rolling pass is defined as approximately 3%;

[0048] If the yield strength σ of the original last rolling pass is greater than or equal to 600MPa and less than 900MPa, the reduction rate of the new rolling pass is defined as approximately 4%;

[0049] If the yield strength σ of the original last rolling pass is less than 600MPa and greater than or equal to 300MPa, the reduction rate of the new rolling pass is defined as approximately 5%;

[0050] If the yield strength σ of the original last rolling pass is less than 300MPa, the reduction rate of the new rolling pass is defined as approximately 6%.

[0051] Among them, the deformation resistance is inferred from the calculation model of rolling force, and then the yield strength of steel after work hardening is obtained. Specifically, the calculation model of rolling force is:

[0052] P=Bl′ c Q P K T K

[0053] Among them, l′ c is the contact arc length of the deformation zone after flattening, in mm; K is the deformation resistance, in MPa; B is the width of the tie, in mm; Q P is the external friction stress state coefficient after flattening, and its calculation formula is:

[0054]

[0055] μ is the friction coefficient, ε is the average reduction rate, h1h1 is the thickness of the tied piece after tying, K T is the tension coefficient, and its calculation formula is:

[0056]

[0057] a τ is the weighted coefficient of post-tension stress, generally taken as a τ =0.6; τ b is the post-tension stress, unit: MPa; τ f is the pre-tension stress, unit: MPa.

[0058] According to the elastic contact deformation theory, the contact arc length l′ after the roller is flattened c Expressed as

[0059]

[0060]

[0061] R is the roller radius, in mm; R' is the roller radius after flattening, in mm; C0 is the roller flattening coefficient, generally taken as 2.2×10-5; Δh is the absolute reduction, in mm.

[0062] Therefore, the deformation resistance is inferred from the above rolling force calculation model. The specific process is as follows:

[0063]

[0064]

[0065]

[0066] The yield strength of the steel after work hardening is then obtained: σ=K / 1.15.

[0067] In addition, in the embodiment of the present application, if the reduction rate of the newly added pass after adjustment is higher than the reduction rate of the second pass after adjustment, the original reduction rate of the last pass is restored, and the reduction rate is taken from the second pass at the end. If there is no high surface quality requirement for the cold hard coil, the reduction rate allocation of the newly added pass at the end is replaced by increasing the roughness of the working roll. Optionally, if the difference in the plate shape value of the strip after the last pass of rolling is greater than 40I under the original rolling procedure, the surface roughness of the working roll can be increased to 1.2, and the new rolling pass with a reduction rate within a preset range added at the last pass of rolling is matched; if the difference in the plate shape value of the strip after the last pass of rolling is greater than 80I under the original rolling procedure, the surface roughness of the working roll is increased to 1.4, and the new rolling pass with a reduction rate within a preset range added at the last pass of rolling is matched. Where I represents the flatness of the plate shape.

[0068] The embodiment of the present invention can optimize the rolling process and working roll roughness of the 18-roll single-stand rolling mill to address the asymmetric plate shape defect problem of the existing 18-roll rolling mill. The optimized unit can have the ability to regulate asymmetric plate shape defects, thereby greatly improving the plate shape of the strip after rolling.

[0069] The following example illustrates the rolling schedule adjustment method of an 18-high rolling mill for asymmetric plate shape defects according to an embodiment of the present invention:

[0070] When designing a new set of rolling procedures and roll configuration plans, the strip steel of the same specification under the original rolling procedure (rolling process) is used as the standard to conduct a comparative analysis of the plate shape state, and the rolling process is optimized and the working roll roughness is designed based on the original rolling process. After multiple iterative tests, the planned rolling plan and roll configuration plan are finally determined and used for mass production.

[0071] First, obtain the cold rolling production data of the 18-high mill and the typical asymmetric plate shape defect problems that are prone to occur. The cold rolling production data includes: the specifications of the produced strip steel, the yield strength of the steel to be rolled, the surface quality requirements of the target product, the reduction rate of each pass, the plate shape data of each channel of the plate shape meter, the tension before and after each pass, etc.; the 18-high mill problems include the typical asymmetric plate shape types that are prone to occur, the corresponding specifications, the corresponding roll numbers, and the length of asymmetric plate shape defects, etc.

[0072] Then, the data processing and regularity analysis of asymmetric plate shape defects are carried out for the cold rolling production data of the 18-high rolling mill. Specifically, according to the steel coil number as the index, the strip specification parameters (plate width, plate thickness), rolling procedure parameters (reduction rate of each pass, tension before and after each pass), the type and length of asymmetric plate shape defects generated, and the plate shape data of each channel of the plate shape meter are extracted in sequence. The steel type of this steel coil is then used to match its yield strength and the surface quality of the target product.

[0073] The product gauge parameters and rolling procedure parameters are used as basic parameter values, and the data of each channel of the shape meter are used as process detection values. The corresponding relationship between each parameter and the type of asymmetric shape defects of the strip is statistically analyzed to determine the influence of the product gauge parameters and rolling procedure parameters on the degree of asymmetric shape and its indications in each channel of the shape meter. The indications of each channel of the shape meter need to be fitted according to the following formula:

[0074] h(x)=a4x 4 +a2x 2 +a1x+a0

[0075] Among them, x is the strip width, and a0-a4 are fitting curve coefficients. According to the full-length plate shape distribution law, the above formula is fitted to each section of the rolled strip, and the full-length distribution function a1(x) of its first-order coefficient a1 is obtained. The full-length distribution function a1(x) of its first-order coefficient is obtained:

[0076] a1(x)=0.765sin(0.23x+7.34)+0.027

[0077] After that, a new rolling procedure is set according to the asymmetric situation to coordinate the deformation differences of each strip segment. The corresponding grade of this embodiment is set as DP780, and the deformation resistance of the last pass is calculated to be σ=827MPa, which is higher than the standard value of 600MPa, and a 4% reduction rate is required for the last pass. The original reduction rate of the last pass of this grade of strip is 11.8%, so this embodiment reduces it to 7.8%, and adds a 4% reduction rate for the new pass. Considering that the post-pass of this roll is the galvanizing process, the acceptable range of the roughness of the galvanized incoming material is relatively large, and combined with the original cold rolling process, the plate shape value difference is about 57I, and the working roll with a surface roughness of 1.2 is used for rolling.

[0078] According to the above process, rolling was performed for three coils of iterative testing, namely "01 coil", "02 coil" and "03 coil". The experimental results are as follows:

[0079] After the 01 volume experiment, the asymmetric plate shape was weakened, and the plate shape value difference was reduced to 17I. It was judged that there was excessive regulation, and then it was planned to increase the final pass reduction rate to 3.5%, and carry out the 02 volume experiment;

[0080] After the 02-volume experiment, the asymmetric plate shape was also weakened, and the plate shape value difference was reduced to 10I. It was judged that the regulation was appropriate, and the 03-volume experiment was immediately carried out to test the stability;

[0081] After the 03-volume experiment, the plate shape difference value was 11I, and it was determined that the process was stable and mass production could be carried out.

[0082] In summary, the embodiment of the present invention obtains the current cold rolling production data of the eighteen-roll rolling mill and the data of typical asymmetric plate shape defects that are prone to occur; based on the typical asymmetric plate shape defect data that are prone to occur, the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production is obtained according to the current cold rolling production data, and the basic control parameters include product specification parameters and rolling procedure parameters; according to the degree of asymmetric plate shape and the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production, the rolling procedure parameters are adjusted to coordinate the deformation differences of each strip segment, and in view of the asymmetric plate shape defect problem of the existing eighteen-roll rolling mill, the rolling process of the eighteen-roll single-frame rolling mill is optimized, which can have the ability to regulate asymmetric plate shape defects, so that the plate shape state of the strip after rolling is greatly improved.

[0083] like Figure 2 The structure diagram of a rolling schedule adjustment device for an 18-high rolling mill facing asymmetric plate shape defects provided by one embodiment of the present invention is shown, and the device comprises:

[0084] The data acquisition module 201 is used to acquire the current cold rolling production data of the 18-high rolling mill and the typical asymmetric plate shape defect data that is prone to occur;

[0085] A relationship acquisition module 202 is used to acquire the relationship between the degree of asymmetric flatness and basic control parameters of cold rolling production based on typical asymmetric flatness defect data that is prone to occur according to current cold rolling production data, where the basic control parameters include product specification parameters and rolling procedure parameters;

[0086] The parameter adjustment module 203 is used to adjust the rolling procedure parameters according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0087] The device of the above embodiment is applied to the corresponding method in the above embodiment, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0088] Figure 3 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 3 As shown, the electronic device may include: a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor, the communication interface and the memory communicate with each other through the communication bus. The processor may call the logic instructions in the memory to execute a rolling procedure adjustment method for an 18-roll mill facing asymmetric plate shape defects, the method comprising: obtaining the current cold rolling production data of the 18-roll mill and the typical asymmetric plate shape defect data that are prone to occur; based on the typical asymmetric plate shape defect data that are prone to occur, obtaining the relationship between the asymmetric plate shape degree and the basic control parameters of cold rolling production according to the current cold rolling production data, the basic control parameters include product specification parameters and rolling procedure parameters; adjusting the rolling procedure parameters according to the asymmetric plate shape degree and the relationship between the asymmetric plate shape degree and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0089] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0090] On the other hand, an embodiment of the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by the computer, the computer can execute a rolling procedure adjustment method for an eighteen-roll mill for asymmetric plate shape defects provided by the above-mentioned method embodiments, the method including: obtaining current cold rolling production data of the eighteen-roll mill and typical asymmetric plate shape defect data that are prone to occur; based on the typical asymmetric plate shape defect data that are prone to occur, obtaining the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production according to the current cold rolling production data, the basic control parameters including product specification parameters and rolling procedure parameters; adjusting the rolling procedure parameters according to the degree of asymmetric plate shape and the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0091] On the other hand, an embodiment of the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute a rolling procedure adjustment method for an eighteen-roll mill for asymmetric plate shape defects provided in the above-mentioned embodiments, the method comprising: obtaining current cold rolling production data of the eighteen-roll mill and data of typical asymmetric plate shape defects that are prone to occur; based on the data of typical asymmetric plate shape defects that are prone to occur, obtaining the relationship between the degree of asymmetric plate shape and basic control parameters of cold rolling production according to the current cold rolling production data, the basic control parameters including product specification parameters and rolling procedure parameters; adjusting the rolling procedure parameters according to the degree of asymmetric plate shape and the relationship between the degree of asymmetric plate shape and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

[0092] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0093] The above is only a partial implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for adjusting the rolling schedule of an 18-high rolling mill for asymmetric plate shape defects, characterized in that: The method comprises: Obtain the current cold rolling production data of the 18-high rolling mill and the typical asymmetric plate shape defect data that is prone to occur; Based on typical asymmetric flatness defect data that is prone to occur, the relationship between the degree of asymmetric flatness and basic control parameters of cold rolling production is obtained according to the current cold rolling production data, wherein the basic control parameters include product specification parameters and rolling procedure parameters; The rolling procedure parameters are adjusted according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production to coordinate the deformation differences of each strip segment.

2. The method according to claim 1, characterized in that The current cold rolling production data includes but is not limited to: the specifications of the produced strip steel, the yield strength of the steel grade to be rolled, the surface quality requirements of the target product, the reduction rate of each pass, the shape data of each channel of the shape meter, and the tension before and after each pass; wherein the specifications of the produced strip steel include the steel grade, plate width and plate thickness of the strip steel; The typical asymmetric plate shape defect data include but are not limited to: typical asymmetric plate shape types, corresponding product specifications, corresponding roll numbers and asymmetric plate shape defect lengths, wherein the typical asymmetric plate shape types include single-side waves, single-rib waves and offset middle waves.

3. The method according to claim 1, characterized in that The method of obtaining the relationship between the degree of asymmetric flatness and basic control parameters of cold rolling production based on the typical asymmetric flatness defect data that is prone to occur and the current cold rolling production data includes: According to the coil number of the steel coil as the index, the strip steel specification parameters, the rolling procedure parameters, the type of asymmetric flatness defect, the length of the asymmetric flatness defect, and the flatness data of each channel of the flatness meter are extracted in sequence; The basic control parameters, including the process detection data of each channel data of the plate shape meter, are statistically analyzed to determine the correspondence between each parameter and the type of asymmetric plate shape defects of the strip, to determine the influence of the basic control parameters on the degree of asymmetric plate shape, and to obtain the readings on each channel of the plate shape meter.

4. The method according to claim 3, characterized in that The obtaining of the indications of each channel of the shape meter includes: According to the full-length strip shape distribution law, each section of the rolled strip is fitted according to the following relationship to obtain the readings of each channel of the strip shape meter: h(x)=a4x 4 +a2x 2 +a1x+a0 Among them, x is the strip width, a0-a4 are the fitting curve coefficients; At the same time, the full-length distribution function a1(x) of the first-order coefficient a1 is obtained.

5. The method according to claim 1, characterized in that The adjusting of the rolling procedure parameters according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production includes: If any strip steel has a relatively serious asymmetric plate shape defect after rolling, it is determined that the strip steel has a hidden danger of deviation; If the yield strength of the strip steel after work hardening is low and the surface quality requirement of the chilled coil is low, a new rolling pass with a reduction rate within a preset range is added at the last rolling pass; If the reduction rate of the newly added pass after adjustment is higher than the reduction rate of the second pass after adjustment, the reduction rate of the original last pass will be restored and the reduction rate will be taken from the second pass after adjustment. If there is no high surface quality requirement for the cold-hardened coil, the roughness of the working roll can be increased to replace the reduction rate distribution of the last additional pass.

6. The method according to claim 5, characterized in that The new rolling pass with increased reduction rate in the last rolling pass comprises: If the yield strength σ of the original last rolling pass is greater than or equal to 900MPa, the reduction rate of the new rolling pass is defined as approximately 3%; If the yield strength σ of the original last rolling pass is greater than or equal to 600MPa and less than 900MPa, the reduction rate of the new rolling pass is defined as approximately 4%; If the yield strength σ of the original last rolling pass is less than 600MPa and greater than or equal to 300MPa, the reduction rate of the new rolling pass is defined as approximately 5%; If the yield strength σ of the original last rolling pass is less than 300MPa, the reduction rate of the new rolling pass is defined as approximately 6%.

7. The method according to claim 5, characterized in that The method of replacing the reduction rate distribution of the last additional pass by improving the roughness of the working roll includes: If the difference in strip shape value after the last rolling pass is greater than 40I under the original rolling procedure, the surface roughness of the working roll can be increased to 1.2, and a new rolling pass with a preset reduction rate can be added in the last rolling pass; If the difference in strip shape value after the last rolling pass is greater than 80I under the original rolling procedure, the surface roughness of the working roll is increased to 1.4, and a new rolling pass with a reduction rate within a preset range is added in the last rolling pass.

8. A rolling schedule adjustment device for an 18-high rolling mill for asymmetric plate shape defects, characterized in that: The device comprises: A data acquisition module is used to acquire the current cold rolling production data of the 18-high rolling mill and the data of typical asymmetric plate shape defects that are prone to occur; A relationship acquisition module, for acquiring the relationship between the degree of asymmetric flatness and basic control parameters of cold rolling production according to the current cold rolling production data based on typical asymmetric flatness defect data that is prone to occur, wherein the basic control parameters include product specification parameters and rolling procedure parameters; The parameter adjustment module is used to adjust the rolling procedure parameters according to the degree of asymmetric flatness and the relationship between the degree of asymmetric flatness and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, it implements a rolling procedure adjustment method for an eighteen-high mill for asymmetric plate shape defects as described in any one of claims 1-7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements a method for adjusting the rolling schedule of an 18-high mill for asymmetric plate shape defects as described in any one of claims 1 to 7.

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