A method and system for gauge changing in a cold rolling tandem mill

Abstract

The application discloses a method and system for variable-gauge rolling of a cold rolling continuous rolling mill, and the method comprises the following steps: in a rolling process, determining whether the i-th sequence of steel coils currently rolled is variable-gauge rolling; wherein the variable-gauge rolling means that the i-th sequence of steel coils currently rolled and the steel coils last rolled are not of the same family; if the variable-gauge rolling, selecting the rolling force self-learning coefficient of the i-1-th sequence of steel coils of the same family from the available sample libraries of two variable-gauge sample libraries, and calculating the set rolling force of the i-th sequence of steel coils; wherein the two variable-gauge sample libraries store the self-learning coefficients of the steel coils of the same family, the i-1-th sequence of steel coils and the i-th sequence of steel coils belong to the steel coils of the same family and the i-1-th sequence of steel coils is rolled first; and rolling the i-th sequence of steel coils by using the set rolling force.

Description

Technical Field

[0001] This application relates to the field of cold rolling technology for steel coils, and in particular to a variable specification rolling method and system for a cold rolling continuous mill. Background Technology

[0002] As is well known, in the production of cold-rolled strip steel, different strip steel specifications require different rolling forces during cold rolling. Even for steel coils of the same family, the actual rolling force can vary significantly. Therefore, dynamic gauge change (FGC) rolling technology is commonly used to address the rolling requirements of strip steel. This technology allows for changes in strip steel specifications during the rolling process, i.e., without stopping the machine, including adjustments to parameters such as steel grade, thickness, and width.

[0003] In dynamic variable-gauge rolling technology, setting the rolling force is of paramount importance. Due to numerous variables during rolling, such as changes in material properties, fluctuations in rolling process parameters, and even variations in the rolling process of the steel coil, the accuracy of the rolling force setting can decrease. Therefore, improving the accuracy of the rolling force setting for steel coils in variable-gauge rolling is a pressing issue that needs to be addressed. Summary of the Invention

[0004] To address or partially address the technical problem of low rolling force setting accuracy in dynamic variable specification rolling technology, this invention provides a variable specification rolling method and system for a cold rolling continuous mill. When the i-th sequence of steel coils is subjected to variable specification rolling, the setting rolling force of the i-th sequence of steel coils is calculated by calling the rolling force self-learning coefficient of the i-1-th sequence of steel coils of the same family, thereby improving the accuracy of the rolling force setting value.

[0005] To address the aforementioned technical problems, a first aspect of the present invention discloses a variable-specification rolling method for a cold rolling mill, the method comprising:

[0006] During the rolling process, it is determined whether the i-th sequence of steel coils being rolled is a variable specification rolling process; wherein, variable specification rolling means that the i-th sequence of steel coils being rolled is from a different family than the steel coils rolled in the previous rolling process.

[0007] If it is variable specification rolling, the rolling force self-learning coefficient of the i-1th sequence of steel coils of the same family is selected from the available sample libraries of the two variable specification sample libraries, and the set rolling force of the i-th sequence of steel coils is calculated; wherein, the two variable specification sample libraries store the self-learning coefficients of steel coils of the same family, the i-1th sequence of steel coils and the i-th sequence of steel coils belong to the same family of steel coils and the i-1th sequence of steel coils is rolled first;

[0008] The i-th sequence of steel coils is rolled using the set rolling force.

[0009] Optionally, after determining whether the currently rolled i-th sequence of steel coils is a variable specification rolled coil, the method further includes:

[0010] If it is not a variable specification rolling process, the rolling force is set according to the previous rolling force.

[0011] Optionally, after rolling the i-th sequence of steel coils using the set rolling force, the method further includes:

[0012] Obtain the rolling force deviation corresponding to the i-th sequence of steel coils;

[0013] The rolling force self-learning coefficient of the i-th sequence steel coil is determined based on the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil.

[0014] Optionally, obtaining the rolling force deviation corresponding to the i-th sequence of steel coils specifically includes:

[0015] The rolling force value is calculated based on the actual parameters of the i-th sequence of steel coil rolling.

[0016] Measure the actual rolling force value of the i-th sequence of steel coils;

[0017] The rolling force deviation is obtained based on the actual rolling force value and the calculated rolling force value.

[0018] Optionally, obtaining the rolling force deviation based on the actual rolling force value and the calculated rolling force value specifically involves:

[0019] According to the formula By processing the actual rolling force value and the calculated rolling force value, the rolling force deviation is obtained; wherein, ZP a P represents the rolling force deviation. a P represents the actual rolling force value. ca This indicates the calculated rolling force value.

[0020] Optionally, the rolling force deviation ZP is used as the basis for... a The rolling force self-learning coefficient of the i-th sequence of steel coils is determined by combining the rolling force self-learning coefficient of the i-1th sequence of steel coils, specifically including:

[0021] According to the formula ZP i =(1-a)·ZP i-1 +a·ZP a The rolling force deviation and the rolling force self-learning coefficient of the (i-1)th sequence of steel coils are processed to obtain the rolling force self-learning coefficient of the i-th sequence of steel coils; where ZP i ZP represents the self-learning coefficient of the rolling force of the i-th sequence of steel coils, α represents the smoothing coefficient, and ZP represents the self-learning coefficient of the rolling force.a ZP represents the rolling force deviation. (i-1) This represents the self-learning coefficient of the rolling force of the (i-1)th sequence of steel coils.

[0022] Optionally, after determining the rolling force self-learning coefficient of the i-th sequence of steel coils based on the rolling force deviation and the rolling force self-learning coefficient of the (i-1)-th sequence of steel coils, the method further includes:

[0023] Determine whether the number of self-learning coefficients of the same type of steel coil stored in the available sample library has reached the set number;

[0024] If not, store the self-learning coefficient of the rolling force of the i-th sequence of steel coils in the available sample library;

[0025] If so, clear the other sample library in the two variable specification sample libraries, and store the rolling force self-learning coefficient of the i-th sequence steel coil in the other sample library.

[0026] Optionally, the available sample library and the other sample library may be alternately zeroed out.

[0027] Optionally, the initial value of the self-learning coefficients for the two variable-size sample libraries is 1.

[0028] A second aspect of the present invention discloses a variable-specification rolling system for a cold rolling mill, comprising:

[0029] The judgment module is used to determine whether the i-th sequence of steel coils being rolled is a variable specification rolling process during the rolling process; wherein, variable specification rolling means that the i-th sequence of steel coils being rolled is a different family from the steel coils rolled in the previous rolling process.

[0030] The calculation module is used to select the rolling force self-learning coefficient of the i-1th sequence of steel coils of the same family from the available sample libraries of two variable specification sample libraries if variable specification rolling is performed, and to calculate the set rolling force of the i-th sequence of steel coils; wherein, the two variable specification sample libraries store the self-learning coefficients of steel coils of the same family, the i-1th sequence of steel coils and the i-th sequence of steel coils belong to the same family of steel coils and the i-1th sequence of steel coils is rolled first;

[0031] A rolling module is used to roll the i-th sequence of steel coils using the set rolling force.

[0032] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0033] This invention provides a variable specification rolling method and system for a cold rolling continuous rolling mill. When the i-th sequence of steel coils is subject to variable specification rolling, the set rolling force of the i-th sequence of steel coils is calculated by calling the rolling force self-learning coefficient of the i-1-th sequence of steel coils of the same family, thereby improving the accuracy of the rolling force setting value.

[0034] 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

[0035] 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:

[0036] Figure 1 A flowchart of a variable-specification rolling method for a cold rolling mill according to an embodiment of the present invention is shown;

[0037] Figure 2 A comparison diagram showing the improvement effect of two methods on a preset rolling force according to an embodiment of the present invention is shown;

[0038] Figure 3 A schematic diagram of a variable-specification rolling system for a cold rolling mill according to an embodiment of the present invention is shown. Detailed Implementation

[0039] 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.

[0040] Firstly, such as Figure 1 As shown in the figure, the variable specification rolling method of a cold rolling mill provided by the present invention includes at least the following steps:

[0041] S101, during the rolling process, determine whether the i-th sequence of steel coils being rolled is a variable specification rolling process.

[0042] Among them, variable specification rolling means that the i-th sequence of steel coils currently being rolled is from a different family than the steel coils rolled in the previous rolling.

[0043] Steel coils of the same type refer to steel coils with the same steel grade, width, target thickness, and incoming material thickness. Steel coils of different types refer to steel coils with differences in one or more of the following: steel grade, width, target thickness, and incoming material thickness. For example, steel coils of grades S06 and S07 are steel coils of different types. Different types of steel coils require different stand reductions, tensions, and other parameters during rolling, resulting in different deformation tensions and other parameters after rolling.

[0044] During the rolling process, it is determined whether it is a variable specification rolling process based on the specification information of the i-th sequence of steel coils being rolled and the steel coils being rolled in the previous rolling process, such as steel type, width, target thickness, and incoming material thickness.

[0045] If the specification information of the i-th sequence of steel coils being rolled is inconsistent with that of the previously rolled steel coil, and the two belong to different categories of steel coils, then it means that the i-th sequence of steel coils being rolled is a variable specification rolling process, and S102 is executed.

[0046] If the specifications of the i-th sequence of steel coils being rolled are the same as those of the previously rolled steel coils, and they belong to the same family of steel coils, then it means that the i-th sequence of steel coils being rolled is not a variable specification rolling process. Therefore, rolling can be carried out according to the rolling force set in the previous rolling process.

[0047] S102, If it is variable specification rolling, select the rolling force self-learning coefficient of the i-1th sequence of steel coils of the same family from the available sample library of the two variable specification sample libraries, and calculate the set rolling force of the i-th sequence of steel coils.

[0048] The two variable-specification sample libraries store self-learning coefficients for steel coils of the same family. The (i-1)th sequence steel coil and the ith sequence steel coil belong to the same family, with the (i-1)th sequence steel coil being rolled first. Specifically, the rolling force self-learning coefficients stored in the variable-specification sample libraries record the deviation between the calculated rolling force and the actual rolling force of the steel coils of the same family that have already been rolled. By calling this deviation, the calculation of the rolling force for the steel coil to be rolled is corrected, thereby improving the accuracy of the rolling force setting.

[0049] In this embodiment, two variable-specification sample libraries are created and used alternately. Both variable-specification sample libraries store self-learning coefficients for steel coils of the same family. A set number N is stored in each variable-specification sample library. If the number of valid samples in one variable-specification sample library reaches the set number N, the data in the other sample library is cleared. By alternately clearing the sample data in the variable-specification sample libraries, a usable self-learning sample library that closely approximates the actual rolling conditions is always available; this is the usable sample library.

[0050] When the i-th sequence of steel coils is rolled using variable specifications, it means that the currently rolled i-th sequence of steel coils is from a different family than the previously rolled steel coils. To improve the accuracy of the rolling force setting during variable specification rolling, the rolling force self-learning coefficient of the (i-1)-th sequence of steel coils belonging to the same family is retrieved from two variable specification sample libraries for reference, thereby calculating the set rolling force for the i-th sequence of steel coils. The i-th sequence of steel coils is a family of steel coils that has been rolled before the i-th sequence of steel coils is rolled, therefore it has reference value and can improve the accuracy of the set rolling force for the i-th sequence of steel coils.

[0051] S103, the i-th sequence of steel coils is rolled using a set rolling force.

[0052] The technical solution of the present invention, when the i-th sequence of steel coils is subjected to variable specification rolling, calculates the set rolling force of the i-th sequence of steel coils by calling the rolling force self-learning coefficient of the i-1-th sequence of steel coils of the same family, thereby improving the accuracy of the rolling force setting value.

[0053] In actual rolling processes, due to process changes, even steel coils of the same family may experience significant variations in actual rolling force, leading to substantial fluctuations in the corresponding self-learning coefficients. To accurately reflect these changes in the self-learning coefficients after process variations, after rolling the i-th sequence of steel coils with a set rolling force, the self-learning coefficients are updated and stored in the variable-specification rolling sample library. This ensures that the self-learning coefficients in the variable-specification rolling sample library more closely reflect actual process variations, thereby improving the accuracy of rolling force settings during subsequent variable-specification rolling.

[0054] In the specific implementation process, firstly, the rolling force deviation corresponding to the i-th sequence of steel coils is obtained.

[0055] In one embodiment, obtaining the rolling force deviation corresponding to the i-th sequence of steel coils specifically includes:

[0056] The rolling force is calculated based on the actual parameters of the i-th sequence of steel coil rolling. Specifically, after the i-th sequence of strip rolling is completed, the actual rolling data—strip width, strip inlet thickness, strip outlet thickness, unit tension on the inlet side, unit tension on the outlet side, work roll radius, and work roll roughness—are substituted into the rolling force calculation formula to solve for the calculated rolling force value based on the actual data. The rolling force calculation formula can use currently commonly used formulas, which will not be elaborated here.

[0057] Measure the actual rolling force value of the i-th sequence of steel coils.

[0058] Based on the actual rolling force value and the calculated rolling force value, the rolling force deviation corresponding to the i-th sequence of steel coils is obtained. Specifically, according to the formula... The actual rolling force value and the calculated rolling force value are processed to obtain the rolling force deviation. Among them, ZPa P represents the rolling force deviation. a P represents the actual rolling force value. ca This indicates the calculated rolling force value. It can be seen that by comparing the measured actual rolling force value with the calculated rolling force value based on the actual data, the rolling force deviation corresponding to the i-th sequence of steel coils can be obtained. Of course, the calculation method for the rolling force deviation is not limited to this; any method for obtaining the rolling force deviation is applicable to this technical solution.

[0059] Secondly, based on the rolling force deviation and the rolling force self-learning coefficient of the (i-1)th sequence of steel coils, the rolling force self-learning coefficient of the i-th sequence of steel coils is determined.

[0060] Specifically, according to the formula ZP i =(1-a)·ZP i-1 +a·ZP a By processing the rolling force deviation and the rolling force self-learning coefficient of the (i-1)th sequence of steel coils, the rolling force self-learning coefficient of the i-th sequence of steel coils is obtained; where ZP i ZP represents the self-learning coefficient of rolling force for the i-th sequence of steel coils, α represents the smoothing coefficient, which can be selected according to the actual situation. a ZP represents the rolling force deviation. (i-1) This represents the self-learning coefficient of the rolling force of the (i-1)th sequence of steel coils.

[0061] The rolling force self-learning coefficient of the i-th sequence of steel coils is obtained by smoothly calculating the rolling force deviation of the i-th sequence of steel coils and the rolling force self-learning coefficient of the (i-1)-th sequence of steel coils in proportion. This method not only considers the iteration of the self-learning coefficient in the same family of steel coils, but also takes into account the rolling force deviation of the current real-world variable process, making the self-learning coefficient in the variable specification rolling sample library closer to the actual process changes, and improving the accuracy of rolling force setting in subsequent variable specification rolling.

[0062] During the storage of the self-learning coefficient of the rolling force for the i-th sequence of steel coils, it is determined whether the number of self-learning coefficients of the same type of steel coil stored in the available sample library has reached a set number N. If not, the self-learning coefficient of the rolling force for the i-th sequence of steel coils is stored in the available sample library; if so, the other sample library of the two variable specification sample libraries is cleared to zero, and the self-learning coefficient of the rolling force for the i-th sequence of steel coils is stored in the other sample library. The available sample library and the other sample library are alternately cleared to zero. By alternating the clearing and storage method, a usable self-learning sample library that closely approximates the actual rolling conditions can be maintained at any given time.

[0063] In one embodiment, the self-learning coefficients of the two variable-size sample libraries are initially set to 1, but this does not constitute a constraint.

[0064] It is worth noting that, in practical applications, in order to save storage resources, the two variable specification sample libraries store the rolling force self-learning coefficients of several steel coils of the same family. When rolling steel coils of different specifications, the rolling force self-learning coefficients of the same family of steel coils can be found in the two variable specification sample libraries in the above manner, calculated and rolled.

[0065] Based on the actual comparison results, such as Figure 2 This is a comparison chart showing the improvement effect of two methods on the preset rolling force. A comparison of the rolling force accuracy over six passes of a certain steel grade shows that the self-learning calculation results of the secondary system using the innovative method of this invention are significantly better than the traditional calculation results.

[0066] Secondly, based on the same inventive concept as the variable-specification rolling method for a cold rolling mill provided in the first aspect of the embodiments described above, the embodiments of the present invention also provide a variable-specification rolling system for a cold rolling mill, see below. Figure 3 ,include:

[0067] The judgment module 301 is used to determine whether the i-th sequence of steel coils being rolled is a variable specification rolling process during the rolling process; wherein, variable specification rolling means that the i-th sequence of steel coils being rolled is a different family from the steel coils rolled in the previous rolling process.

[0068] The calculation module 302 is used to select the rolling force self-learning coefficient of the i-1th sequence of steel coils of the same family from the available sample libraries of the two variable specification sample libraries if it is variable specification rolling, and calculate the set rolling force of the i-th sequence of steel coils; wherein, the two variable specification sample libraries store the self-learning coefficients of steel coils of the same family, the i-1th sequence of steel coils and the i-th sequence of steel coils belong to the same family of steel coils and the i-1th sequence of steel coils is rolled first;

[0069] The rolling module 303 is used to roll the i-th sequence of steel coils using a set rolling force.

[0070] It should be noted that the specific operation methods of each module in the variable specification rolling system of the cold rolling mill provided in the embodiments of the present invention have been described in detail in the method embodiments provided in the first aspect above. The specific implementation process can be referred to the method embodiments provided in the first aspect above, and will not be described in detail here.

[0071] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for variable-specification rolling in a cold rolling mill, characterized in that, The method includes: During the rolling process, determine the current rolling step. Whether the sequence of steel coils is variable specification rolling; wherein, variable specification rolling indicates that the currently rolled first... The sequentially rolled coils are from a different family than the previously rolled coils; If it is variable specification rolling, then select the first sample from the same family of available samples in the two variable specification sample libraries. -1 sequence steel coil rolling force self-learning coefficient, calculate the first... The set rolling force for the sequence of steel coils; wherein, the two variable specification sample libraries store self-learning coefficients of steel coils of the same family, the first... -1 sequence steel coils and the first The sequential steel coils belong to the same family of steel coils and the first -1 sequence steel coils are rolled first; Using the set rolling force to the first The sequential steel coils are rolled; Obtain the first The rolling force deviation corresponding to the sequence of steel coils specifically includes: according to the first... The actual parameters of the sequential steel coil rolling were used to calculate the rolling force value; the first... The actual rolling force value of the sequential steel coil; the rolling force deviation is obtained based on the actual rolling force value and the calculated rolling force value; wherein, according to the formula The actual rolling force value and the calculated rolling force value are processed to obtain the rolling force deviation; wherein, This indicates the rolling force deviation. This indicates the actual rolling force value. This indicates the calculated rolling force value; Based on the rolling force deviation and the first -1 sequence of steel coils, the rolling force self-learning coefficient, determines the first... The self-learning coefficient of rolling force for sequential steel coils specifically includes: according to the formula Processing the rolling force deviation and the first The rolling force self-learning coefficient of the -1 sequence steel coil is used to obtain the first... The self-learning coefficient of rolling force for sequential steel coils; where, Indicates the first The self-learning coefficient of rolling force for sequential steel coils, Represents the smoothing coefficient. Indicates the first -1 sequence steel coil rolling force self-learning coefficient; Determine whether the number of self-learning coefficients of the same type of steel coil stored in the available sample library has reached the set number; If not, the first The self-learning coefficients of the rolling force of the sequential steel coils are stored in the available sample library; If so, clear the other sample library in the two variable specification sample libraries, and reset the first... The self-learning coefficients of the rolling force of the sequential steel coils are stored in the other sample library.

2. The method as described in claim 1, characterized in that, The determination of the current rolling process After determining whether the sequential steel coils are rolled to variable specifications, the method further includes: If it is not a variable specification rolling process, the rolling force is set according to the previous rolling force.

3. The method as described in claim 1, characterized in that, The available sample library and the other sample library are alternately zeroed out.

4. The method as described in claim 1, characterized in that, The initial value of the self-learning coefficient for the two variable-size sample libraries is 1.

5. A variable-gauge rolling system for a cold rolling mill, said system being applied to the method described in any one of claims 1-4, characterized in that, include: The judgment module is used to determine the current rolling stage during the rolling process. Whether the sequence of steel coils is variable specification rolling; wherein, variable specification rolling indicates that the currently rolled first... The sequentially rolled coils are from a different family than the previously rolled coils; The calculation module is used to select the first sample of the same family from the available sample libraries of two variable specification sample libraries if the rolling is of variable specification. -1 sequence steel coil rolling force self-learning coefficient, calculate the first... The set rolling force for the sequence of steel coils; wherein, the two variable specification sample libraries store self-learning coefficients of steel coils of the same family, the first... -1 sequence steel coils and the first The sequential steel coils belong to the same family of steel coils and the first -1 sequence steel coils are rolled first; The rolling module is used to apply the set rolling force to the first... The sequential steel coils are rolled.

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