Methods and related equipment for shape control of cast-in-place slabs

Abstract

This invention discloses a method and related equipment for shape control of mixed-cast slabs, relating to hot-rolling automatic control technology, mainly addressing the shape control problem caused by compositional fluctuations in mixed-cast slabs. The method includes: determining the slab type of the target slab; determining the gain parameter of the target slab when the slab type is a mixed-cast slab; and determining the bending force correction efficiency of the work rolls based on the gain parameter of the target slab. This invention is used for the shape control process of mixed-cast slabs.

Description

Technical Field

[0001] This invention relates to hot rolling automatic control technology, and more particularly to a method and related equipment for controlling the shape of mixed-cast slabs. Background Technology

[0002] In the endless rolling process of mixing different steel grades, the significant differences in chemical composition between the two steel grades, coupled with unpredictable compositional changes during mixing, lead to a rapid increase in load during the rolling of mixed steel grades of the same specification. This results in frequent occurrences of double-sided wave problems during the rolling process, severely affecting rolling stability. Summary of the Invention

[0003] In view of the above problems, the present invention provides a method and related equipment for controlling the shape of mixed-cast slabs, the main purpose of which is to solve the problem of shape control caused by the compositional fluctuation difference of mixed-cast slabs.

[0004] To solve at least one of the above-mentioned technical problems, in a first aspect, the present invention provides a method for controlling the shape of a mixed-cast slab, the method comprising:

[0005] Determine the slab type of the target slab;

[0006] When the target slab type is a mixed-cast slab, determine the gain parameter of the target slab.

[0007] The bending force correction efficiency of the work roll is determined based on the gain parameters of the target slab.

[0008] Optionally, the above methods also include:

[0009] The slab type of the target slab is obtained based on the information of incoming molten steel, mixed steel, outgoing molten steel, and slab product.

[0010] Optionally, the above determination of the slab type for the target slab includes:

[0011] If the target slab is a mixed-cast slab, mark the target slab with a mixed steel identifier.

[0012] When entering the rolling mill, obtain the mixed steel identification of the target slab mentioned above;

[0013] The slab type is determined based on the mixed steel identification of the target slab mentioned above.

[0014] Optionally, the determination of the bending force correction efficiency of the work roll based on the gain parameters of the target slab includes:

[0015] Based on the gain parameters of the target slab, the bending roll force correction efficiency of the work rolls of the roughing mill and finishing mill is determined.

[0016] Optionally, the above methods also include:

[0017] As the gain parameters of the target slab increase, the bending force correction efficiency of the work rolls becomes higher.

[0018] As the gain parameters of the target slab decrease, the bending force correction efficiency of the work rolls becomes lower.

[0019] Optionally, the bending force correction efficiency of the aforementioned work roll is proportional to the speed of the output correction value.

[0020] Optionally, the above methods also include:

[0021] The bending force of the aforementioned work rolls is adjusted to ensure that the strip crown of the target slab is less than the preset value.

[0022] Secondly, embodiments of the present invention also provide a pattern control device for cast slabs, comprising:

[0023] The first determining unit is used to determine the slab type of the target slab;

[0024] The second determining unit is used to determine the gain parameter of the target slab when the slab type of the target slab is a mixed-cast slab.

[0025] The third determining unit is used to determine the bending force correction efficiency of the work roll based on the gain parameters of the target slab.

[0026] To achieve the above objectives, according to a third aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein, when the program is executed by a processor, the steps of the above-described method for controlling the shape of a mixed-cast slab are implemented.

[0027] To achieve the above objectives, according to a fourth aspect of the present invention, an electronic device is provided, comprising at least one processor and at least one memory connected to the processor; wherein the processor is configured to invoke program instructions in the memory to execute the steps of the above-described method for controlling the shape of a mixed-cast slab.

[0028] By employing the above technical solution, the present invention provides a method and related equipment for controlling the shape of mixed-cast slabs. Addressing the shape control problem caused by compositional fluctuations in mixed-cast slabs, the present invention determines the slab type of the target slab; when the target slab type is a mixed-cast slab, it determines the gain parameter of the target slab; and based on the gain parameter of the target slab, it determines the bending force correction efficiency of the work rolls. In this solution, by identifying special mixed-cast slabs, the slabs are effectively marked from both casting machine and rolling mill tracking, and more efficient and faster dynamic bending force compensation is applied to these mixed-cast slabs during the rolling process. This solves the shape control problem caused by compositional fluctuations in mixed-cast slabs.

[0029] Correspondingly, the slab shape control device, equipment, and computer-readable storage medium for mixed casting provided in the embodiments of the present invention also have the above-mentioned technical effects.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 A schematic flowchart of a method for controlling the shape of a mixed-cast slab provided in an embodiment of the present invention is shown.

[0033] Figure 2 This diagram shows a schematic block diagram of the composition of a pattern control device for a mixed-cast slab provided in an embodiment of the present invention;

[0034] Figure 3 This diagram illustrates the composition of an electronic device for controlling the shape of a mixed-cast slab, as provided in an embodiment of the present invention. Detailed Implementation

[0035] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0036] To address the shape control issues arising from compositional fluctuations in mixed-cast slabs, this invention provides a method for shape control of mixed-cast slabs, such as... Figure 1 As shown, the method includes:

[0037] S101. Determine the slab type of the target slab;

[0038] For example, to solve the above problems, the primary task is to identify special mixed-cast slabs, effectively mark the slabs from the casting machine tracking and rolling mill tracking, and take more efficient and faster dynamic compensation of bending roll force for these mixed-cast slabs during the rolling process, so as to realize effective shape control of the mixed-cast slabs in the subsequent production sequence.

[0039] S102. When the slab type of the target slab is a mixed-cast slab, determine the gain parameter of the target slab.

[0040] For example, in the rolling process, adaptive control widely adopts the exponential smoothing method, in which the gain coefficient plays an important role in prediction. It reflects the utilization of information on changes in process state. The information on changes in process state is reflected by measured data, so the value of the gain coefficient depends on the confidence probability of the measured data. However, in practical applications, a fixed value is often given based on experience for recursive calculation, resulting in poor adaptive performance. This method, however, is more targeted at adjusting the gain parameter for mixed-cast slabs.

[0041] S103. Determine the bending force correction efficiency of the work roll based on the gain parameters of the target slab mentioned above.

[0042] For example, by identifying special mixed-cast slabs, these slabs can be effectively marked from both casting machine and rolling mill tracking, and more efficient and faster dynamic compensation of bending roll force can be implemented for these mixed-cast slabs during the rolling process. This solves the slab shape control problem caused by the compositional fluctuation differences of mixed-cast slabs.

[0043] By employing the above technical solution, the present invention provides a method for controlling the shape of mixed-cast slabs. Addressing the shape control problem caused by compositional fluctuations in mixed-cast slabs, the present invention determines the slab type of the target slab; when the target slab type is a mixed-cast slab, it determines the gain parameter of the target slab; and based on the gain parameter of the target slab, it determines the bending force correction efficiency of the work rolls. In this solution, by identifying special mixed-cast slabs, the slabs are effectively marked from both casting machine and rolling mill tracking, and more efficient and faster dynamic bending force compensation is applied to these mixed-cast slabs during the rolling process. This solves the shape control problem caused by compositional fluctuations in mixed-cast slabs.

[0044] In one embodiment, the above method further includes:

[0045] The slab type of the target slab is obtained based on the information of incoming molten steel, mixed steel, outgoing molten steel, and slab product.

[0046] For example, this solution first targets the functions of casting machine mixed steel slab identification, rolling mill mixed steel tracking, and rolling mill mixed steel dynamic bending roll force control. It first carries out the judgment logic work of casting machine tracking and mixed steel model module regarding mixed steel slab.

[0047] For example, the above-mentioned incoming molten steel information includes: ladle composition and tilting flow rate; the above-mentioned mixed steel information includes: tundish composition and tundish weight; the above-mentioned outgoing molten steel information includes: crystallizer chemical composition and billet flow rate; the above-mentioned slab product information includes: heat segmentation and quality rate.

[0048] For example, the computational characteristics of the material tracking process are as follows: continuous calculation of material balance; real-time assessment of molten steel compensation; calculation of thermal separation point to determine the output material ratio. Ultimately, it determines the heat batch for each product and identifies which slabs contain mixed steel.

[0049] In one embodiment, determining the slab type of the target slab includes:

[0050] If the target slab is a mixed-cast slab, mark the target slab with a mixed steel identifier.

[0051] When entering the rolling mill, obtain the mixed steel identification of the target slab mentioned above;

[0052] The slab type is determined based on the mixed steel identification of the target slab mentioned above.

[0053] For example, when determining the heat number for each product, there are several situations: there is no product containing mixed steel, a product containing the components of the previous heat, and a product containing the components of the next heat.

[0054] If the target slab is determined to be a mixed-cast slab, a mixed steel identifier is marked on the target slab to facilitate the subsequent determination of the slab type.

[0055] For example, after the casting machine system sends the slab information to the rolling mill stage, the rolling mill system updates the PDI (Primary Data Input) information table in the database and effectively identifies each product with mixed steel information. The mixed steel slab is automatically identified as "MIX" on the rolling mill stage tracking interface, and this identification participates in the model calculation and automatic control.

[0056] In one embodiment, determining the bending force correction efficiency of the work roll based on the gain parameter of the target slab includes:

[0057] Based on the gain parameters of the target slab, the bending roll force correction efficiency of the work rolls of the roughing mill and finishing mill is determined.

[0058] For example, embodiments of the present invention identify special mixed-cast slabs, effectively mark these slabs from both casting machine and rolling mill tracking, and implement more efficient and faster dynamic compensation of bending roll force for these mixed-cast slabs during the rolling process. This solves the slab shape control problem caused by the compositional fluctuations of the mixed-cast slabs.

[0059] In one embodiment, the above method further includes:

[0060] As the gain parameters of the target slab increase, the bending force correction efficiency of the work rolls becomes higher.

[0061] As the gain parameters of the target slab decrease, the bending force correction efficiency of the work rolls becomes lower.

[0062] For example, the efficiency of the bending force correction of the work roll can be changed by adjusting the gain parameter of the mixed-cast slab.

[0063] In one embodiment, the bending force correction efficiency of the aforementioned work roll is proportional to the speed of the output correction value.

[0064] For example, the higher the bending roller force correction efficiency, the faster the correction value output.

[0065] In one embodiment, the above method further includes:

[0066] The bending force of the aforementioned work rolls is adjusted to ensure that the strip crown of the target slab is less than the preset value.

[0067] For example, the strip crown changes depending on the rolling force. An FFC mill aims to maintain a constant strip crown by altering the work roll bending force. The strip crown changes depending on the rolling force. An FFC mill aims to maintain a constant strip crown by altering the work roll bending force.

[0068] The correction amount for the bending roller force is calculated using the following formula:

[0069]

[0070]

[0071] Among them, the above

[0072] ΔF(i): Correction amount for bending force of the work roll (kN / chock)

[0073] G(i): Adjusted gain (%)

[0074] Rolling force influence coefficient (from SSUC)

[0075] Bending roll force influence coefficient (from SSUC)

[0076] ΔP(i)=P(i)-P M (i)

[0077] P(i): Rolling force measured during the rolling process

[0078] P M (i): Rolling force near the head of memory (storage rolling force)

[0079] It is understood that the embodiments of the present invention define multiple modes:

[0080] Mode A: Locked Mode. The memorized rolling force is the rolling force measured at the strip head. (Similar to relative control)

[0081] Mode B: Setting mode. The memorized rolling force is the FSUC rolling force setting value. (Similar to absolute control)

[0082] Mode A / B is determined by the primary switch. Switching occurs for all racks (not for each rack).

[0083] Understandably, the final bending roller controller reference is determined by checking the upper and lower limits. If the limit value is exceeded, the calculation result will be replaced with the limit value.

[0084] For example, during the steel mixing process, a larger bending roll force is required to compensate for the large changes in rolling force during the steel mixing process. Therefore, based on the function of the FFC mill, an amplification factor for the steel mixing slab is added, and the compensation amount of the FFC mill during the steel mixing process is increased to achieve a better bending roll force compensation effect.

[0085] For example, the FFC adjustment gain table under non-mixed steel conditions is shown in Table 1:

[0086] Table 1. Adjustment gain of FFC under non-mixed steel conditions (L2)

[0087] H0 H1 H2 F1 F2 F3 F4 F5 Gain G(i)[%] 1 1 1 1 1 1 1 1

[0088] Table 2 shows the FFC gain adjustment table under non-mixed steel conditions:

[0089] Table 2. FFC gain amplification (L2) under FFC_multi mixed steel conditions

[0090] H0 H1 H2 F1 F2 F3 F4 F5 Gain G(i)[%] 1.5 1.5 1.5 1.5 2 2 2 1.5

[0091] The numbers H0, H1, H2, F1, F2, F3, F4 and F5 above are the mill unit numbers of the rolling mill.

[0092] For example, the limit of the mixed steel FFC rolling mill is L1. The data interface from L2 to L1 remains unchanged. The secondary stage will send the amplified gain coefficient to L1, as shown in Table 3 below:

[0093] Table 3. Data Interface from L2 to L1

[0094]

[0095] Furthermore, as a response to the above Figure 1 In addition to the implementation of the method shown, this embodiment of the invention also provides a pattern control device for cast slabs, used for the above-mentioned... Figure 1 The method shown is implemented accordingly. This device embodiment corresponds to the foregoing method embodiment. For ease of reading, this device embodiment will not repeat the details of the foregoing method embodiment, but it should be clear that the device in this embodiment can implement all the contents of the foregoing method embodiment. Figure 2 As shown, the device includes: a first determining unit 21, a second determining unit 22, and a third determining unit 23, wherein...

[0096] The first determining unit 21 is used to determine the slab type of the target slab;

[0097] The second determining unit 22 is used to determine the gain parameter of the target slab when the slab type of the target slab is a mixed casting slab.

[0098] The third determining unit 23 is used to determine the bending force correction efficiency of the work roll based on the gain parameters of the target slab.

[0099] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and by adjusting kernel parameters, a method for controlling the shape of cast slabs can be implemented, solving the problem of shape control caused by compositional fluctuations in cast slabs.

[0100] This invention provides a computer-readable storage medium including a stored program that, when executed by a processor, implements the above-described method for controlling the shape of a cast slab.

[0101] This invention provides a processor for running a program, wherein the program executes the above-mentioned method for controlling the shape of the cast slab.

[0102] This invention provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the pattern control method for cast slabs as described above.

[0103] This invention provides an electronic device 30, such as... Figure 3 As shown, the electronic device includes at least one processor 301, and at least one memory 302 and bus 303 connected to the processor; wherein, the processor 301 and the memory 302 communicate with each other through the bus 303; the processor 301 is used to call program instructions in the memory to execute the above-mentioned method for controlling the shape of the cast slab.

[0104] The smart electronic devices mentioned in this article can be PCs, tablets, mobile phones, etc.

[0105] This application also provides a computer program product that, when executed on a process management electronic device, is suitable for executing a program that initializes the above-described method for controlling the shape of a mixed-cast slab.

[0106] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0107] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0108] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0109] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0110] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0111] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The control flow of the memory in the corresponding embodiment.

[0112] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0113] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0114] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0115] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0116] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0117] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0118] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for controlling the shape of a mixed-cast slab, characterized in that, include: Determine the slab type of the target slab; When the target slab type is a mixed-cast slab, the gain parameter of the target slab is determined; The bending force correction efficiency of the work roll is determined based on the gain parameters of the target slab. The slab type of the target slab is obtained based on the incoming molten steel information, mixed steel information, outgoing molten steel information, and slab product information; Determining the slab type of the target slab includes: If the target slab is a mixed-cast slab, mark the target slab with a mixed steel identifier; When the target slab enters the rolling mill, the mixed steel identification is obtained; The slab type is determined based on the mixed steel identification of the target slab; The determination of the bending force correction efficiency of the work roll based on the gain parameter of the target slab includes: The bending roll force correction efficiency of the work rolls of the roughing mill and finishing mill is determined based on the gain parameters of the target slab. As the gain parameter of the target slab increases, the bending force correction efficiency of the work roll becomes higher. As the gain parameter of the target slab decreases, the bending force correction efficiency of the work roll becomes lower.

2. The method according to claim 1, characterized in that, The bending force correction efficiency of the working roll is proportional to the speed of the output correction value.

3. The method according to claim 1, characterized in that, Also includes: The bending force of the work roll is adjusted to ensure that the strip crown of the target slab is less than a preset value.

4. A pattern control device for mixed-cast slabs, characterized in that, include: The first determining unit is used to determine the slab type of the target slab; The second determining unit is used to determine the gain parameter of the target slab when the slab type of the target slab is a mixed-cast slab. The third determining unit is used to determine the bending force correction efficiency of the work roll based on the gain parameter of the target slab. The slab type of the target slab is obtained based on the incoming molten steel information, mixed steel information, outgoing molten steel information, and slab product information; Determining the slab type of the target slab includes: If the target slab is a mixed-cast slab, mark the target slab with a mixed steel identifier; When the target slab enters the rolling mill, the mixed steel identification is obtained; The slab type is determined based on the mixed steel identification of the target slab; The determination of the bending force correction efficiency of the work roll based on the gain parameter of the target slab includes: The bending roll force correction efficiency of the work rolls of the roughing mill and finishing mill is determined based on the gain parameters of the target slab. As the gain parameter of the target slab increases, the bending force correction efficiency of the work roll becomes higher. As the gain parameter of the target slab decreases, the bending force correction efficiency of the work roll becomes lower.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed by a processor, it implements the pattern control method for the mixed-cast slab as described in any one of claims 1 to 3.

6. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the pattern control method for the mixed-cast slab as described in any one of claims 1 to 3.

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