Variable-specification rolling method and system of cold rolling continuous mill

Abstract

The invention discloses a variable-specification rolling method and system for a cold-rolling continuous mill, and the method comprises the steps: judging whether a currently rolled ith sequence steel coil is subjected to variable-specification rolling or not in a rolling process; wherein the variable-specification rolling means that the currently rolled ith sequence steel coil and the steel coil rolled last time are different in family; if variable-specification rolling is carried out, the rolling force self-learning coefficient of the (i-1) th sequence steel coil of the same class is selected from the available sample library of the two variable-specification sample libraries, and the set rolling force of the ith sequence steel coil is calculated; wherein self-learning coefficients of steel coils of the same family are stored in the two variable specification sample libraries, the steel coil of the (i-1) th sequence and the steel coil of the ith sequence belong to the steel coils of the same family, and the steel coil of the (i-1) th sequence is rolled before; and the steel coil in the ith sequence is rolled through the set rolling force.

Description

Technical Field

[0001] The present application relates to the technical field of cold rolling of steel coils, and in particular to a variable specification rolling method and system of a cold rolling tandem mill. Background Art

[0002] As we all know, in the process of cold-rolled steel strip production, different strip specifications require different rolling forces in cold rolling production. Even for the same family of steel coils, the actual rolling force will vary greatly. Therefore, the dynamic variable specification (Flying Gauge Change, FGC) rolling technology is usually used to meet the rolling needs of strip steel. This technology allows the specifications of the strip steel to be changed during the rolling process, that is, without stopping the machine, including the adjustment of parameters such as steel type, thickness, width, etc.

[0003] In the dynamic variable specification rolling technology, the setting of rolling force is of utmost importance. Since there are multiple variable factors in the rolling process, such as changes in material properties, fluctuations in rolling process parameters, and even changes in the rolling process of steel coils, these may lead to a decrease in the accuracy of rolling force setting. Therefore, how to improve the accuracy of rolling force setting for steel coils during variable specification rolling is an urgent problem to be solved. Summary of the invention

[0004] In order to solve or partially solve the technical problem of low rolling force setting accuracy of dynamic variable specification rolling technology, the present invention provides a variable specification rolling method and system for a cold rolling mill. When the i-th sequence steel coil belongs to variable specification rolling, the rolling force self-learning coefficient of the i-1th sequence steel coil of the same family is called to calculate the set rolling force of the i-th sequence steel coil, thereby improving the accuracy of the rolling force setting value.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a variable gauge rolling method of a cold rolling mill, the method comprising:

[0006] During the rolling process, it is determined whether the currently rolled i-th sequence steel coil is rolled with variable specifications; wherein variable specifications rolling means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil;

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

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

[0009] Optionally, after determining whether the currently rolled i-th sequence steel coil is rolled with variable specifications, the method further includes:

[0010] If it is not variable specification rolling, rolling is carried out according to the set rolling force of the previous rolling.

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

[0012] Obtaining a rolling force deviation corresponding to the i-th sequence steel coil;

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

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

[0015] Calculating a rolling force value according to actual rolling parameters of the i-th sequence steel coil;

[0016] Measuring the actual rolling force value of the i-th sequence steel coil;

[0017] The rolling force deviation is obtained according to the actual rolling force value and the calculated rolling force value.

[0018] Optionally, the rolling force deviation is obtained according to the actual rolling force value and the calculated rolling force value, specifically:

[0019] According to the formula Processing the actual rolling force value and the calculated rolling force value to obtain the rolling force deviation; wherein ZP a Denotes the rolling force deviation, P a Represents the actual rolling force value, P ca Indicates the calculated rolling force value.

[0020] Optionally, the rolling force deviation ZP a and the rolling force self-learning coefficient of the i-1th sequence steel coil, determining the rolling force self-learning coefficient of the i-th sequence steel coil, specifically comprising:

[0021] According to the formula ZP i =(1-a)·ZP i-1 +a·ZP a Process the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil to obtain the rolling force self-learning coefficient of the i-th sequence steel coil; wherein ZP i represents the rolling force self-learning coefficient of the i-th sequence steel coil, α represents the smoothing coefficient, ZPa Denotes the rolling force deviation, ZP (i-1) Represents the rolling force self-learning coefficient of the i-1th sequence steel coil.

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

[0023] Determine whether the number of self-learning coefficients of the same type of steel coils stored in the available sample library reaches a set number;

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

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

[0026] Optionally, the available sample library and the another sample library are cleared alternately.

[0027] Optionally, the initial values ​​of the self-learning coefficients of the two variable-specification sample libraries are 1.

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

[0029] A judgment module is used to judge whether the currently rolled i-th sequence steel coil is a variable specification rolling during the rolling process; wherein variable specification rolling means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil;

[0030] A calculation module, for, if variable specification rolling is performed, selecting a rolling force self-learning coefficient of an i-1th sequence steel coil of the same family from the available sample libraries of the two variable specification sample libraries, and calculating a set rolling force of the i-th sequence steel coil; wherein the two variable specification sample libraries store self-learning coefficients of steel coils of the same family, the i-1th sequence steel coil and the i-th sequence steel coil belong to the same family of steel coils, and the i-1th sequence steel coil is rolled first;

[0031] A rolling module is used to roll the i-th sequence steel coil 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] The present invention provides a variable specification rolling method and system for a cold rolling mill. When the i-th sequence steel coil belongs to variable specification rolling, the set rolling force of the i-th sequence steel coil is calculated by calling the rolling force self-learning coefficient of the i-1th sequence steel coil of the same family, thereby improving the accuracy of the rolling force setting value.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0036] Figure 1 A flow chart showing a variable gauge rolling method of 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 gauge rolling system of a cold rolling mill according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0040] First, as Figure 1 As shown, a variable gauge rolling method of a cold rolling mill provided by an embodiment of the present invention comprises at least the following steps:

[0041] S101, during the rolling process, determining whether the i-th sequence steel coil currently being rolled is a variable specification rolling.

[0042] The variable specification rolling indicates that the i-th sequence steel coil currently being rolled is of a different family from the steel coil last rolled.

[0043] The same family of steel coils refers to steel coils with the same steel type, width, target thickness, and incoming material thickness. Different families of steel coils refer to steel coils with one or more different steel types, widths, target thicknesses, and incoming material thicknesses. For example, steel coils with steel types S06 and S07 are different families of steel coils. The rack reduction and tension set during rolling of steel coils of different families are different, and the deformation tension and other parameters after rolling are also different.

[0044] During the rolling process, whether variable specification rolling is performed is determined based on the specification information of the currently rolled i-th sequence steel coil and the last rolled steel coil, such as steel type, width, target thickness, incoming material thickness, etc.

[0045] If the specification information of the currently rolled i-th sequence steel coil is inconsistent with the specification information of the last rolled steel coil, and the two belong to different families of steel coils, it means that the currently rolled i-th sequence steel coil is variable specification rolling, and S102 is executed.

[0046] If the specification information of the currently rolled i-th sequence steel coil is consistent with that of the last rolled steel coil, and both belong to the same family of steel coils, it means that the currently rolled i-th sequence steel coil is not variable specification rolling. Therefore, it can be rolled according to the set rolling force of the last rolling.

[0047] S102: If it is variable specification rolling, the rolling force self-learning coefficient of the i-1th sequence steel coil 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 steel coil is calculated.

[0048] Among them, the two variable specification sample libraries store the self-learning coefficients of the same family of steel coils. The i-1th sequence steel coil and the i-th sequence steel coil belong to the same family of steel coils, and the i-1th sequence steel coil is rolled first. Specifically, the rolling force self-learning coefficient stored in the variable specification sample library records the deviation between the calculated rolling force and the actual rolling force of the same family of steel coils that have completed rolling. By calling the deviation to correct the rolling force calculation of the steel coil to be rolled, the purpose of improving the rolling force setting accuracy can be achieved.

[0049] In this embodiment, two variable specification sample libraries are created for alternate use, and both variable specification sample libraries store self-learning coefficients of the same family of steel coils. The two variable specification sample libraries store a set number N. If the number of valid samples in a variable specification sample library reaches the set number N, the data of the other sample library is cleared. By alternately clearing the sample data in the variable specification sample library, there is always a self-learning sample library that can be used and is close to the actual rolling situation at any time, that is, the available sample library.

[0050] When the i-th sequence steel coil is rolled with variable specifications, it means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil. In order to improve the accuracy of setting the rolling force during variable specification rolling, the rolling force self-learning coefficient of the i-1th sequence steel coil belonging to the same family of steel coils is found from the two variable specification sample libraries for reference, so as to calculate the set rolling force of the i-th sequence steel coil. The i-th sequence steel coil is a steel coil of the same family that has been rolled before the i-th sequence steel coil is rolled, so it has reference significance and can improve the accuracy of setting the rolling force of the i-th sequence steel coil.

[0051] S103, rolling the i-th sequence steel coil using the set rolling force.

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

[0053] In the actual rolling process, affected by the process change, even the same family of steel coils will have a large change in actual rolling force, and the corresponding self-learning coefficient will also fluctuate greatly. In order to truly reflect the change of the self-learning coefficient after the process change, after the i-th sequence steel coil is rolled with the set rolling force, the following rolling force self-learning coefficient will be updated and stored in the variable specification rolling sample library, so that the self-learning coefficient in the variable specification rolling sample library is closer to the on-site process changes, thereby improving the rolling force setting accuracy during subsequent variable specification rolling.

[0054] In a specific implementation process, first, the rolling force deviation corresponding to the i-th sequence steel coil is obtained.

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

[0056] According to the actual parameters of the rolling of the i-th sequence steel coil, the calculated rolling force value is calculated. Specifically, after the i-th sequence strip is rolled, the actual rolling data: strip width, strip inlet thickness, strip outlet thickness, inlet side unit tension, outlet side unit tension, working roll radius, working roll roughness and other data are brought into the rolling force calculation formula to solve the calculated rolling force value based on the actual data. The rolling force calculation formula can adopt the current general calculation formula, which will not be repeated here.

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

[0058] According to the actual rolling force value and the calculated rolling force value, the rolling force deviation corresponding to the i-th sequence steel coil is obtained. Specifically, according to the formula Process the actual rolling force value and the calculated rolling force value to obtain the rolling force deviation.a Indicates the rolling force deviation, P a Indicates the actual rolling force value, P ca It 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 calculated based on the actual data, the rolling force deviation corresponding to the i-th sequence steel coil can be obtained. Of course, the calculation method of the rolling force deviation is not limited to this, and any current method of 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-th sequence steel coil, the rolling force self-learning coefficient of the i-th sequence steel coil is determined.

[0060] Specifically, according to the formula ZP i =(1-a)·ZP i-1 +a·ZP a Process the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil to obtain the rolling force self-learning coefficient of the i-th sequence steel coil; where ZP i It represents the self-learning coefficient of the rolling force of the i-th sequence steel coil, α represents the smoothing coefficient, which can be determined according to the actual situation, ZP a Indicates the rolling force deviation, ZP (i-1) Represents the rolling force self-learning coefficient of the i-1th sequence steel coil.

[0061] The rolling force self-learning coefficient of the i-th sequence steel coil is obtained by smoothing the rolling force deviation of the i-th sequence steel coil and the rolling force self-learning coefficient of the i-1-th sequence steel coil in proportion. This method not only takes into account 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 reaction variable process, so that the self-learning coefficient in the variable specification rolling sample library is closer to the on-site process changes, and can improve the rolling force setting accuracy during subsequent variable specification rolling.

[0062] In the process of storing the rolling force self-learning coefficient of the i-th sequence steel coil, determine whether the number of self-learning coefficients of the same family of steel coils stored in the available sample library reaches the set number N; if not, store the rolling force self-learning coefficient of the i-th sequence steel coil in the available sample library; if so, clear the other sample library of 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. The available sample library and the other sample library are cleared alternately. By means of alternating clearing and storage, there can be a self-learning sample library that can be used and close to the actual rolling situation at any time.

[0063] In one embodiment, the initial value of the self-learning coefficient of the two variable-specification sample libraries is 1, but this does not constitute a limitation.

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

[0065] According to the actual comparison effect, such as Figure 2 , is a comparison chart of the improvement effect of the two methods on the preset rolling force. Through the comparison of the rolling force accuracy of six passes of a certain steel grade, it can be seen that the self-learning calculation result of the secondary system using the innovative method of the present invention is significantly better than the traditional calculation result.

[0066] In the second aspect, based on the same inventive concept as the variable gauge rolling method of a cold rolling mill provided in the embodiment of the first aspect, the embodiment of the present invention further provides a variable gauge rolling system of a cold rolling mill, see Figure 3 ,include:

[0067] The judgment module 301 is used to judge whether the currently rolled i-th sequence steel coil is a variable specification rolling during the rolling process; wherein the variable specification rolling means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil;

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

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

[0070] It should be noted that the variable-specification rolling system of the cold rolling mill provided in the embodiment of the present invention, wherein the specific manner in which each module performs operations has been described in detail in the method embodiment provided in the above-mentioned first aspect. The specific implementation process can refer to the method embodiment provided in the above-mentioned first aspect, and will not be elaborated in detail here.

[0071] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A variable gauge rolling method for a cold rolling mill, characterized in that: The method comprises: During the rolling process, it is determined whether the currently rolled i-th sequence steel coil is rolled with variable specifications; wherein variable specifications rolling means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil; If it is variable specification rolling, the rolling force self-learning coefficient of the i-1th sequence steel coil 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 steel coil is calculated; wherein the two variable specification sample libraries store the self-learning coefficients of the same family steel coils, the i-1th sequence steel coil and the i-th sequence steel coil belong to the same family of steel coils, and the i-1th sequence steel coil is rolled first; The i-th sequence steel coil is rolled using the set rolling force.

2. The method according to claim 1, characterized in that After determining whether the currently rolled i-th sequence steel coil is rolled with variable specifications, the method further includes: If it is not variable specification rolling, rolling is carried out according to the set rolling force of the previous rolling.

3. The method according to claim 1, characterized in that After rolling the i-th sequence of steel coils using the set rolling force, the method further comprises: Obtaining a rolling force deviation corresponding to the i-th sequence steel coil; Based on the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil, the rolling force self-learning coefficient of the i-th sequence steel coil is determined.

4. The method according to claim 3, characterized in that The step of obtaining the rolling force deviation corresponding to the i-th sequence of steel coils specifically includes: Calculating a rolling force value according to actual rolling parameters of the i-th sequence steel coil; Measuring the actual rolling force value of the i-th sequence steel coil; The rolling force deviation is obtained according to the actual rolling force value and the calculated rolling force value.

5. The method according to claim 4, characterized in that The rolling force deviation is obtained according to the actual rolling force value and the calculated rolling force value, specifically: According to the formula Processing the actual rolling force value and the calculated rolling force value to obtain the rolling force deviation; wherein ZP a Denotes the rolling force deviation, P a Represents the actual rolling force value, P ca Indicates the calculated rolling force value.

6. The method according to claim 3, characterized in that The rolling force deviation ZP a and the rolling force self-learning coefficient of the i-1th sequence steel coil, determining the rolling force self-learning coefficient of the i-th sequence steel coil, specifically comprising: According to the formula ZP i =(1-a)·ZP i-1 +a·ZP a Process the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil to obtain the rolling force self-learning coefficient of the i-th sequence steel coil; wherein ZP i represents the rolling force self-learning coefficient of the i-th sequence steel coil, α represents the smoothing coefficient, ZP a Denotes the rolling force deviation, ZP (i-1) Represents the rolling force self-learning coefficient of the i-1th sequence steel coil.

7. The method according to claim 3, characterized in that After determining the rolling force self-learning coefficient of the i-th sequence steel coil based on the rolling force deviation and the rolling force self-learning coefficient of the i-1th sequence steel coil, the method further includes: Determine whether the number of self-learning coefficients of the same type of steel coils stored in the available sample library reaches a set number; If not, storing the rolling force self-learning coefficient of the i-th sequence steel coil in the available sample library; If so, the other sample library of the two variable specification sample libraries is cleared, and the rolling force self-learning coefficient of the i-th sequence steel coil is stored in the other sample library.

8. The method according to claim 7, characterized in that The available sample library and the another sample library are cleared alternately.

9. The method according to claim 1, characterized in that The initial value of the self-learning coefficient of the two variable-specification sample libraries is 1.

10. A variable gauge rolling system for a cold rolling mill, characterized in that: include: A judgment module is used to judge whether the currently rolled i-th sequence steel coil is a variable specification rolling during the rolling process; wherein variable specification rolling means that the currently rolled i-th sequence steel coil is of a different family from the last rolled steel coil; A calculation module, for, if variable specification rolling is performed, selecting a rolling force self-learning coefficient of an i-1th sequence steel coil of the same family from the available sample libraries of the two variable specification sample libraries, and calculating a set rolling force of the i-th sequence steel coil; wherein the two variable specification sample libraries store self-learning coefficients of steel coils of the same family, the i-1th sequence steel coil and the i-th sequence steel coil belong to the same family of steel coils, and the i-1th sequence steel coil is rolled first; A rolling module is used to roll the i-th sequence steel coil using the set rolling force.

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