Method and device for adjusting rolling schedule of eighteen-roller rolling mill for asymmetric plate shape defects

Abstract

The application provides a rolling schedule adjustment method and device for an eighteen-roller rolling mill for asymmetric plate shape defects, and the method comprises the following steps: obtaining current cold rolling production data of the eighteen-roller rolling mill and typical asymmetric plate shape defect data 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 based on the typical asymmetric plate shape defect data prone to occur, wherein the basic control parameters comprise product specification parameters and rolling schedule parameters; and adjusting the rolling schedule 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 section of the strip. The present application can optimize the rolling range of the eighteen-roller single-stand rolling mill, has the regulation and control ability for the asymmetric plate shape defects of the eighteen-roller single-stand rolling mill, and greatly improves the plate shape state of the rolled strip.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of eighteen-roller single stand cold rolling mill, and particularly relates to a rolling schedule adjustment method and device for eighteen-roller rolling mill facing asymmetric plate shape defects. BACKGROUND

[0002] As a thin strip strong rolling mill, the eighteen-roller rolling mill has the characteristics of small roller diameter and strong rolling thinness, and can be applied to the rolling production of non-ferrous metals, stainless steel, electrical steel, automobile plate and the like. However, due to the large deflection of the roller under the small roller diameter, the eighteen-roller rolling mill is prone to high-order deflection of the roller, the roll gap shape control ability is weakened, and the rolled plate strip presents asymmetric plate shape defects. If the strip with asymmetric plate shape is passed into the post-process unit, it is easy to produce deviation in the subsequent galvanizing and continuous annealing unit, affect the quality of the passed plate, and even cause the production line to stop. Then, the eighteen-roller rolling mill adopts the roller layout strategy of large roller diameter gradient, the ratio of the supporting roller, the intermediate roller and the working roller is much larger than 1-2 of the conventional model, and the working roller is in a floating state due to the small roller diameter, and it is difficult to improve the roll gap shape control ability of the rolling mill through the roll shape.

[0003] In view of such technical problems, the industry has successively proposed means such as roll shape development, machine type modification, rolling schedule design, and adding an asymmetric plate shape defect processing procedure. In terms of roll shape design and development, a work roll shape is developed according to the characteristics of plate shape defects generated by the target machine type, or a middle roll shape is developed and combined with a bending and shifting roll strategy to achieve the purpose of managing asymmetric plate shape defects; in terms of machine type modification, the roll system layout of the target machine type is coordinated to reduce the roll diameter gap, thereby improving the roll stiffness and enhancing the plate shape control capability of the machine set; in terms of rolling schedule design, the rolling reduction rate of each pass is redistributed according to the size specification, steel grade, and product post-process processing requirements of the to-be-rolled strip, thereby coordinating the relationship between the plastic deformation of the rolled piece and the insufficient stiffness of the machine type; and in terms of adding an asymmetric plate shape defect processing procedure, the rolled steel coil is sent to the temper mill production line, and a tempering process is added to weaken the asymmetric plate shape defects, thereby providing a base material for the post-process. The above methods and measures have achieved certain results in different machine sets, but are difficult to be directly applied to the eighteen-roll rolling mill due to the characteristics of the eighteen-roll rolling mill. Firstly, the eighteen-roll rolling mill has a large roll diameter gradient, and the design and development of the work roll shape and the middle roll shape are difficult to compensate for the stiffness defects, and the single plate shape control means caused by the floating roll of the work roll also restricts the adjustment of the bending and shifting roll strategy; secondly, unlike the traditional four-roll and six-roll rolling mill, the main roll system of the eighteen-roll rolling mill inherits the characteristics of the four-roll and six-roll machine type, but in order to constrain the small-diameter work roll, four sets of side support roll systems are added on the inlet and outlet sides, at this time the machine type is complex and relatively specified, and it is difficult to modify the machine type; thirdly, the single rolling schedule is also limited by the characteristics of the machine set, and it is still difficult to coordinate the asymmetric plate shape problem by simply redistributing the reduction rate of each pass; and fourthly, although the addition of the tempering process slightly improves the asymmetric plate shape problem, the excessive force requirement of the tempering process often exceeds the limit of the temper mill, and the investment in the tempering process easily increases the production cost of the strip and promotes the production of inverted phenomenon.

[0004] Therefore, it is urgent to propose an asymmetric plate shape defect management method for the roll system characteristics of the eighteen-roll rolling mill to ensure the stable and efficient production of the process pass. SUMMARY

[0005] The main purpose of the embodiment of the present application is to provide a rolling schedule adjustment method and device for an eighteen-roll rolling mill with asymmetric plate shape defects, which optimizes the rolling schedule of the eighteen-roll single-stand rolling mill and has the ability to control asymmetric plate shape defects, so that the plate shape state of the rolled strip is greatly improved, solving the problems of large roll deflection constraint, serious plate shape defects after rolling, poor production stability, and difficult to guarantee the quality of the plate in the subsequent process in the prior art.

[0006] In a first aspect, a rolling schedule adjustment method for an eighteen-roller mill facing asymmetric strip shape defects is provided. The method comprises: obtaining current cold rolling production data of the eighteen-roller mill and typical asymmetric strip shape defect data prone to occur; obtaining a relationship between an asymmetric strip shape degree and basic control parameters of cold rolling production based on the typical asymmetric strip shape defect data prone to occur according to the current cold rolling production data, the basic control parameters including product specification parameters and rolling schedule parameters; and adjusting the rolling schedule parameters according to the asymmetric strip shape degree and the relationship between the asymmetric strip shape degree and the basic control parameters of cold rolling production, so as to coordinate deformation differences of each section of the strip.

[0007] In another possible implementation, the current cold rolling production data includes but is not limited to: a product specification of a production strip, a yield strength of a steel grade to be rolled, a surface quality requirement of a target product, a pass reduction rate, strip shape data of each channel of a shape meter, and tension before and after each pass; the product specification of the production strip includes a steel grade of the strip, a plate width, and a plate thickness; the typical asymmetric strip shape defect data includes but is not limited to: a typical asymmetric strip shape type, a corresponding product specification, a corresponding coil number, and a length of an asymmetric strip shape defect, wherein the typical asymmetric strip shape type includes a single edge wave, a single rib wave, and a biased middle wave.

[0008] In a possible implementation, obtaining a relationship between an asymmetric strip shape degree and basic control parameters of cold rolling production based on the typical asymmetric strip shape defect data prone to occur according to the current cold rolling production data comprises: taking a coil number of a coil as an index, and sequentially extracting a product specification parameter of a strip, a rolling schedule parameter, a generated asymmetric strip shape defect type, a length of the asymmetric strip shape defect, and strip shape data of each channel of a shape meter; and taking the basic control parameters, including process detection data of each channel of the shape meter, to statistically determine a corresponding relationship between each parameter and the asymmetric strip shape defect type of the strip, to determine an influence law of the asymmetric strip shape degree on the basic control parameters, and to obtain a reading performance at each channel of the shape meter.

[0009] In another possible implementation, obtaining a reading performance at each channel of the shape meter comprises: according to a full-length strip shape distribution law, fitting each section of the rolled strip according to the following relationship to obtain readings of each channel of the shape meter:

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

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

[0012] In another possible implementation, the rolling schedule parameter is adjusted according to the degree of asymmetric strip shape and the relationship between the degree of asymmetric strip shape and the basic control parameter of cold rolling production, including: if any strip steel has a serious asymmetric strip shape defect after rolling, it is determined that the strip steel has a run-off risk; if the yield strength of the strip steel is low after work hardening and the surface quality requirement of the cold hard coil is low, a new rolling pass with a preset range of reduction is added at the last pass of rolling; if the new pass reduction after adjustment is higher than the reduction of the second last pass after adjustment, the original last pass reduction is restored and the reduction of the second last pass is used; if the cold hard coil does not have a high surface quality requirement, the roughness of the work roll is increased to replace the reduction distribution of the new last pass.

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

[0014] In another possible implementation, the roughness of the work roll is increased to replace the reduction distribution of the new last pass, including: if the difference between the strip shape values of the strip steel after rolling at the last pass of rolling under the original rolling schedule is greater than 40I, the surface roughness of the work roll is increased to 1.2 and a new rolling pass with a preset range of reduction is added at the last pass of rolling; if the difference between the strip shape values of the strip steel after rolling at the last pass of rolling under the original rolling schedule is greater than 80I, the surface roughness of the work roll is increased to 1.4 and a new rolling pass with a preset range of reduction is added at the last pass of rolling.

[0015] In a second aspect, a rolling schedule adjustment device for an eighteen-roll mill facing asymmetric strip shape defects is provided, the device including: a data acquisition module configured to acquire current cold rolling production data of the eighteen-roll mill and typical asymmetric strip shape defect data prone to occur; a relationship acquisition module configured to acquire a relationship between a degree of asymmetric strip shape and a basic control parameter of cold rolling production based on the current cold rolling production data and the typical asymmetric strip shape defect data prone to occur, the basic control parameter including a product specification parameter and a rolling schedule parameter; and a parameter adjustment module configured to adjust the rolling schedule parameter according to the degree of asymmetric strip shape and the relationship between the degree of asymmetric strip shape and the basic control parameter of cold rolling production, so as to coordinate deformation differences of each section of the strip steel.

[0016] In a third aspect, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the rolling schedule adjustment method for an eighteen-roller mill facing asymmetric shape defects when executing the program.

[0017] In a fourth aspect, a non-transitory computer-readable storage medium is provided, and the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the rolling schedule adjustment method for an eighteen-roller mill facing asymmetric shape defects according to the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced.

[0019] Figure 1 A flow chart of a rolling schedule adjustment method for an eighteen-roller mill facing asymmetric shape defects is provided for an embodiment of the present application.

[0020] Figure 2 A structural diagram of a rolling schedule adjustment device for an eighteen-roller mill facing asymmetric shape defects is provided for an embodiment of the present application.

[0021] Figure 3 An entity structure schematic diagram of an electronic device is provided for the present application.

[0022] DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar modules or modules with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application.

[0024] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, modules and / or components exist, 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 say a module is "connected" or "coupled" to another module, it can be directly connected or coupled to other modules, or there can be intermediate modules. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any module and all combinations of the associated listed items.

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

[0026] The technical solutions of the present application and the solutions to the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described again in some examples. The embodiments of the present application will be described below with reference to the drawings.

[0027] As a thin strip strong rolling mill, the eighteen-roller mill has the characteristics of small roller diameter and strong thin rolling, and can be applied to the rolling production of non-ferrous metal, stainless steel, electrical steel, automobile plate and other series of products. Due to the large deflection constraint of the roller under small roller diameter, the eighteen-roller mill is prone to high-order deflection of the roller, the roll gap shape control ability is weakened, and the rolled strip presents an asymmetric strip shape defect. If the strip with asymmetric strip shape is passed into the post-process unit, it is easy to produce deviation in the subsequent galvanizing and continuous annealing unit, affecting the strip quality, and even causing the production line to stop. Therefore, it is urgent to develop a method for treating the asymmetric strip shape defect of the eighteen-roller mill according to the characteristics of the roller system to ensure stable strip passing and efficient production of the process unit.

[0028] As Figure 1 shown is a flowchart of a rolling schedule adjustment method for an eighteen-roller mill facing an asymmetric strip shape defect according to an embodiment of the present application, and the method comprises the following steps.

[0029] In step S11, current cold rolling production data of the eighteen-roller mill and typical asymmetric strip shape defect data prone to appear are obtained.

[0030] Specifically, the current icing condition of the to-be-evaluated substation, the icing equipment, and the meteorological information in the next 15 days, including temperature and humidity, climate, etc., are investigated. At the same time, the recent ultraviolet detection spectrum and data are collected. The icing equipment in the present application is mainly the post insulator, preferably the 220-kilovolt post insulator. Of course, in other embodiments of the present application, it can also be other equipment in the to-be-evaluated substation, which is not specifically limited. The substation will have a patrol personnel, and the equipment icing is serious and will report the post insulator icing condition.

[0031] In step S12, the relationship between the asymmetric strip shape degree and the basic control parameters of the cold rolling production, including the specification parameters and the rolling schedule parameters, is obtained according to the current cold rolling production data based on the typical asymmetric strip shape defect data prone to appear.

[0032] In step S13, the rolling schedule parameters are adjusted according to the asymmetric strip shape degree and the relationship between the asymmetric strip shape degree and the basic control parameters of the cold rolling production, so as to coordinate the deformation difference of each section of the strip.

[0033] The embodiment of the present application adjusts the rolling procedure of the eighteen-roller mill for the asymmetric plate shape defects, optimizes the rolling range of the eighteen-roller single-stand mill for the asymmetric plate shape defects of the existing eighteen-roller mill, has the regulation and control ability of the asymmetric plate shape defects, and greatly improves the plate shape state of the rolled strip.

[0034] In the embodiment of the present application, the current cold rolling production data includes but is not limited to: the product specification of the produced strip, the yield strength of the to-be-rolled steel, the surface quality requirement of the target product, the reduction rate of each pass, the plate shape data of each channel of the shape meter, the tension before and after each pass, etc.; wherein the product specification of the produced strip includes the steel grade, the plate width, the plate thickness, etc.

[0035] The typical asymmetric plate shape defect data includes but is not limited to: the typical asymmetric plate shape type, the corresponding product specification, the corresponding coil number, and the asymmetric plate shape defect length, etc., wherein the typical asymmetric plate shape type includes single edge wave, single rib wave, offset middle wave, etc.

[0036] In step S12, first, the steel grade type of the coil is matched with the yield strength and the surface quality of the target product. Optionally, according to the coil number of the coil as an index, the strip product specification parameters, the rolling procedure parameters, the generated asymmetric plate shape defect type, the asymmetric plate shape defect length, and the plate shape data of each channel of the shape meter are extracted in turn. Among them, the strip product specification parameters include the plate width, the 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 the plate shape data of each channel of the shape meter, are used to statistically determine the corresponding relationship between each parameter and the strip asymmetric plate shape defect type, to judge the influence law of the basic control parameters on the degree of asymmetric plate shape, and to obtain the indication performance at 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 plate shape distribution law, each cross section of the rolled strip is fitted according to the following relationship to obtain the indication of each channel of the shape meter:

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

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

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

[0042] In step S13, the rolling schedule parameters are adjusted according to the asymmetric strip shape degree and the relationship between the asymmetric strip shape degree and the basic control parameters of the cold rolling production. Alternatively, if any strip steel has a more serious asymmetric strip shape defect after rolling, it is determined that the strip steel has a run-off hidden danger, i.e., is prone to a run-off problem in a subsequent process.

[0043] If the yield strength of the work-hardened strip steel is low and the demand for the surface quality of the cold-hardened coil is low, a new rolling pass with a preset range of reduction is added at the last rolling pass. The preset range of reduction of the new rolling pass is preferably 3-6%, and the reduction is distributed from the original last rolling pass. Alternatively, the range interval of the yield strength of the work-hardened strip steel is determined, and the specific ranges are shown in Table 1.

[0044] Table 1 Range interval of yield strength

[0045]

[0046] The reduction distribution of the new pass can be determined as follows:

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

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

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

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

[0051] Wherein, the deformation resistance is back calculated according to a rolling force calculation model, and then the yield strength of the work-hardened steel is obtained. Specifically, the rolling force calculation model is:

[0052] P=Bl′ c Q P K T K

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

[0054]

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

[0056]

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

[0058] According to the elastic contact deformation theory, the contact arc length l′ c is expressed as

[0059]

[0060]

[0061] R is the roll radius, in mm; R' is the flattened roll radius, in mm; C0 is the roll flattening coefficient, generally 2.2 x 10-5; Δh is the absolute reduction, in mm.

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

[0063]

[0064]

[0065]

[0066] Further, the yield strength of the work-hardened steel is σ = K / 1.15.

[0067] In addition, in the embodiments of the present application, if the newly added pass reduction ratio after adjustment is higher than the second-to-last pass reduction ratio after adjustment, the original last pass reduction ratio is restored, and the reduction ratio is taken from the second-to-last pass. If there is no higher surface quality requirement for the cold hard coil, the surface roughness of the work roll is increased to replace the reduction ratio distribution amount of the newly added last pass. Optionally, if the difference between the plate shape values of the strip after rolling in the last pass under the original rolling schedule is greater than 40I, the surface roughness of the work roll can be increased to 1.2, and the new rolling pass with the newly added preset range reduction ratio in the last pass is used in combination with the front. If the difference between the plate shape values of the strip after rolling in the last pass under the original rolling schedule is greater than 80I, the surface roughness of the work roll is increased to 1.4, and the new rolling pass with the newly added preset range reduction ratio in the last pass is used in combination with the front. Wherein I represents the plate shape flatness.

[0068] The embodiment of the present application can be aimed at the asymmetric shape defect problem of the existing eighteen-roller rolling mill, optimize the rolling range and work roll roughness of the eighteen-roller single-stand rolling mill, and the optimized mill group can have the regulation and control ability of the asymmetric shape defect, so that the shape state of the rolled strip is greatly improved.

[0069] The following illustrates the rolling schedule adjustment method of the eighteen-roller rolling mill for asymmetric shape defects in the embodiment of the present application:

[0070] When a new set of rolling schedule design and roll system configuration scheme is performed, the strip of the same product specification under the original rolling schedule (rolling range) is taken as a standard to perform a shape state comparison analysis, and the rolling range optimization and work roll roughness design are performed on the basis of the original rolling range; after multiple iteration tests, the planned rolling scheme and roll system configuration scheme are finally determined, and then used for batch production.

[0071] Firstly, the cold rolling production data and typical asymmetric shape defect problems prone to occur of the eighteen-roller rolling mill are obtained. The cold rolling production data includes: product specification of the produced strip, yield strength of the to-be-rolled steel, surface quality requirement of the target product, pass reduction rate, shape data of each channel of the shape meter, front and rear tension of each pass, etc.; the eighteen-roller rolling mill problems include typical asymmetric shape types prone to occur, corresponding product specifications, corresponding coil numbers, and asymmetric shape defect lengths, etc.

[0072] Then, the data processing and rule analysis of the asymmetric shape defect are performed on the basis of the cold rolling production data of the eighteen-roller rolling mill. Specifically, according to the coil number as an index, the strip product specification parameters (strip width, strip thickness), rolling schedule parameters (pass reduction rate, front and rear tension of each pass), the generated asymmetric shape defect type and asymmetric shape defect length, and the shape data of each channel of the shape meter are extracted in sequence. And the steel type of this coil is matched with the yield strength and the surface quality of the target product.

[0073] The product specification parameters and rolling schedule parameters are taken as the basic parameter values, and the shape data of each channel of the shape meter is taken as the process detection value. The corresponding relationship between each parameter and the asymmetric shape defect type of the strip is counted, and the influence law of the asymmetric shape degree on the product specification parameters and the rolling schedule parameters and the indication performance of each channel of the shape meter are judged. The indication of each channel of the shape meter needs to be fitted according to the following formula:

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

[0075] Wherein, x is the width of the strip, and a0-a4 is the fitting curve coefficient. According to the full-length shape distribution law, the above formula is fitted for each section of the rolled strip, and the full-length distribution function a1(x) of the first-order coefficient a1 is obtained.

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

[0077] After setting a new rolling schedule according to the asymmetric case, the deformation difference of each section of the strip is coordinated. The corresponding grade of the embodiment is DP780, and the final pass deformation resistance is obtained by calculation, σ = 827 MPa, which is higher than the standard value 600 MPa, and the final pass 4% reduction is required. The reduction of the original rolling final pass of the strip of this grade is 11.8%, so it is reduced to 7.8% in this embodiment, and a new pass of 4% reduction is added. Considering that the post-pass of the coil is a galvanizing process, the acceptable range of the roughness of the galvanizing feed is large, and combined with the difference of the original cold rolling process plate shape value of about 57I, the work roll with a surface roughness of 1.2 is used to perform rolling.

[0078] According to the foregoing process, the rolling is performed, and the iteration test strip 3 coils are counted, namely "01 coil", "02 coil" and "03 coil". The experimental results are as follows:

[0079] After the 01 coil experiment, the asymmetric plate shape is weakened, and the plate shape value difference is reduced to 17I, it is judged that there is excessive regulation, and then the final pass reduction is planned to be increased to 3.5%, and the 02 coil experiment is carried out;

[0080] After the 02 coil experiment, the asymmetric plate shape is also weakened, and the plate shape value difference is reduced to 10I, it is judged that the regulation is moderate, and then the 03 coil experiment is carried out to test the stability;

[0081] After the 03 coil experiment, the plate shape difference value is 11I, it is judged that the process is stable and can be executed in batch production.

[0082] In summary, the embodiment of the present application obtains the current cold rolling production data of the eighteen-roll rolling mill and the typical asymmetric plate shape defect data prone to occur; based on the typical asymmetric plate shape defect data prone to occur, the relationship between the asymmetric plate shape degree and the basic control parameters of the cold rolling production is obtained according to the current cold rolling production data, the basic control parameters include product specification parameters and rolling schedule parameters; the rolling schedule parameters are adjusted according to the asymmetric plate shape degree and the relationship between the asymmetric plate shape degree and the basic control parameters of the cold rolling production, so as to coordinate the deformation difference of each section of the strip, optimize the rolling range of the eighteen-roll single-stand rolling mill, have the regulation and control ability of the asymmetric plate shape defect, and greatly improve the plate shape state of the rolled strip.

[0083] As Figure 2 shown is a structure diagram of a rolling schedule adjustment device of an eighteen-roll rolling mill for asymmetric plate shape defects provided by an embodiment of the present application, the device comprises:

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

[0085] The relationship acquisition module 202 is used to acquire the relationship between the degree of asymmetric shape and the basic control parameters of cold rolling production based on the data of typical asymmetric shape defects that are prone to occur and the current cold rolling production data. The basic control parameters include specification parameters and rolling process parameters.

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

[0087] The apparatus of the above embodiments is applied to the corresponding methods in the foregoing embodiments and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0088] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include: a processor 301, a communication interface 302, a memory 303, and a communication bus 304. The processor, communication interface, and memory communicate with each other via the communication bus. The processor can call logical instructions in the memory to execute a rolling schedule adjustment method for an 18-roll mill oriented towards asymmetric strip shape defects. This method includes: acquiring current cold rolling production data and typical asymmetric strip shape defect data of the 18-roll mill; based on the typical asymmetric strip shape defect data, acquiring the relationship between the degree of asymmetry and the basic control parameters of cold rolling production according to the current cold rolling production data. The basic control parameters include specification parameters and rolling schedule parameters; adjusting the rolling schedule parameters according to the degree of asymmetry and the relationship between the degree of asymmetry and the basic control parameters of cold rolling production to coordinate the deformation differences of each strip segment.

[0089] Further, the logic instructions in the memory described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0090] In another aspect, the embodiments of the present application also provide a computer program product, which comprises a computer program stored on a non-transitory computer readable storage medium, and the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer can execute a rolling schedule adjustment method for an eighteen-roller mill facing an asymmetric plate shape defect, which comprises: obtaining current cold rolling production data of the eighteen-roller mill and typical asymmetric plate shape defect data prone to occur; obtaining a relationship between an asymmetric plate shape degree and basic control parameters of cold rolling production according to the current cold rolling production data based on the typical asymmetric plate shape defect data prone to occur, wherein the basic control parameters comprise product specification parameters and rolling schedule parameters; and adjusting the rolling schedule 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 deformation differences of each section of the strip.

[0091] In another aspect, the embodiments of the present application also provide a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement a rolling schedule adjustment method for an eighteen-roller mill facing an asymmetric plate shape defect, which comprises: obtaining current cold rolling production data of the eighteen-roller mill and typical asymmetric plate shape defect data prone to occur; obtaining a relationship between an asymmetric plate shape degree and basic control parameters of cold rolling production according to the current cold rolling production data based on the typical asymmetric plate shape defect data prone to occur, wherein the basic control parameters comprise product specification parameters and rolling schedule parameters; and adjusting the rolling schedule 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 deformation differences of each section of the strip.

[0092] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown in a sequence as indicated by arrows, the steps are not necessarily executed in the order as indicated by the arrows. Unless explicitly stated otherwise herein, the execution of the steps is not necessarily limited to a strict order, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the accompanying drawings can comprise multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of which is not necessarily sequential, but can be round-robin or alternating with at least some of the other steps or sub-steps or stages of other steps.

[0093] The above merely describes some implementation manners of the present application, and it should be noted that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A method for adjusting the rolling schedule of an 18-roll mill for asymmetric plate shape defects, characterized in that, The method includes: Obtain current cold rolling production data and typical asymmetric plate shape defects that are prone to occur in the 18-roll mill; Based on data on typical asymmetric plate shape defects 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. The basic control parameters include specification parameters and rolling process parameters. The rolling process parameters are adjusted according to the degree of asymmetry and the relationship between the degree of asymmetry and the basic control parameters of cold rolling production in order to coordinate the deformation differences of each strip segment. 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 strip shape data of each channel of the strip shaper, and the tension before and after each pass; wherein the specifications of the produced strip include the steel grade, strip width, and strip thickness. The typical asymmetric plate shape defect data includes, but is not limited to: typical asymmetric plate shape type, corresponding specification, corresponding roll number, and asymmetric plate shape defect length, wherein the typical asymmetric plate shape type includes single-sided wave, single-rib wave, and offset center wave; The relationship between the degree of asymmetric shape and the basic control parameters of cold rolling production is obtained based on the data of typical asymmetric shape defects that are prone to occur, according to the current cold rolling production data. This includes: Using the coil number as an index, extract the strip steel specification parameters, rolling process parameters, types of asymmetric plate shape defects, lengths of asymmetric plate shape defects, and plate shape data for each channel of the plate shaper in sequence. Based on the basic control parameters, including the strip shape data of each channel of the strip shaper, the correspondence between the basic control parameters and strip shape data and the types of asymmetric strip shape defects is statistically analyzed. The influence of the basic control parameters on the degree of asymmetric strip shape is determined, and the readings of each channel of the strip shaper are obtained.

2. The method as described in claim 1, characterized in that, The acquisition of readings on each channel of the plate shape analyzer includes: Based on the overall strip shape distribution pattern, the following relationship was fitted to each cross-section of the rolled strip to obtain the readings of each channel of the strip shape meter: in, For strip width, These are the coefficients of the fitted curve; Simultaneously obtain the coefficient of the linear term. Full-length distribution function .

3. The method as described in claim 1, characterized in that, The adjustment of the rolling process parameters based on the degree of asymmetry and the relationship between the degree of asymmetry and the basic control parameters of cold rolling production includes: If any strip steel exhibits a relatively serious asymmetric shape defect after rolling, it is determined that the strip steel has a potential for deviation. If the strip has a low yield strength after work hardening and low requirements for surface quality of cold-rolled coils, then a new rolling pass with a preset range of reduction rate is added to the last rolling pass. If the reduction rate of the newly added track after adjustment is higher than the reduction rate of the second-to-last track after adjustment, then the original reduction rate of the last track will be restored, and the reduction rate will be taken from the original second-to-last track. If there is no high surface quality requirement for cold-rolled coils, the reduction rate allocation of the last additional pass can be replaced by increasing the roughness of the work rolls.

4. The method as described in claim 3, characterized in that, The new rolling pass that adds a preset range of reduction rate in the final rolling pass includes: If the yield strength σ of the original last rolling pass is greater than or equal to 900 MPa, then the reduction rate of the new passing pass is defined as approximately 3%. If the yield strength σ of the original last rolling pass is greater than or equal to 600 MPa and less than 900 MPa, then 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 600 MPa but greater than or equal to 300 MPa, then 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 300 MPa, then the reduction rate of the new pass is defined as approximately 6%.

5. The method as described in claim 3, characterized in that, The method of replacing the reduction rate allocation of the last additional pass by increasing the roughness of the work roll includes: If, under the original rolling procedure, the difference in strip shape value after the last rolling pass is greater than 40I, the surface roughness of the work roll can be increased to 1.2, and a new rolling pass with a preset range of reduction rate can be added to the last rolling pass. If, under the original rolling procedure, the difference in strip shape value after the last rolling pass is greater than 80I, then the surface roughness of the work rolls should be increased to 1.4, and a new rolling pass with a preset range of reduction rate should be added to the last rolling pass.

6. An adjustment device for a rolling schedule adjustment method for an 18-roll mill addressing asymmetric plate shape defects as described in claim 1, characterized in that, The device includes: The data acquisition module is used to acquire the current cold rolling production data and typical asymmetric shape defect data that are prone to occur in the 18-roll mill. 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 shape data of each channel of the shape meter, and the tension before and after each pass. The specifications of the produced strip include the steel grade, width, and thickness of the strip. The typical asymmetric shape defect data includes, but is not limited to: the typical asymmetric shape type, the corresponding specification, the corresponding coil number, and the length of the asymmetric shape defect. The typical asymmetric shape type includes single-sided wave, single-rib wave, and offset center wave. The relationship acquisition module is used to obtain the relationship between the degree of asymmetric shape and the basic control parameters of cold rolling production based on the data of typical asymmetric shape defects that are prone to occur and the current cold rolling production data. The basic control parameters include specification parameters and rolling process parameters. The parameter adjustment module is used to adjust the rolling process parameters according to the degree of asymmetry and the relationship between the degree of asymmetry and the basic control parameters of cold rolling production, so as to coordinate the deformation differences of each strip segment.

7. 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 schedule adjustment method for an 18-roll mill oriented towards asymmetric plate shape defects as described in any one of claims 1-5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements a rolling schedule adjustment method for an 18-roll mill oriented towards asymmetric plate shape defects as described in any one of claims 1-5.

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