Hot continuous rolling finish rolling open roller gap leveling value matching method

Abstract

The invention discloses a hot continuous rolling finish rolling open roller gap leveling value matching method. The method comprises the steps that after roller replacement open rolling is conducted, current roller system information of a machine is extracted; searching whether first target roll system information matched with all contents of the current roll system information exists in roll system information stored in a database or not; if yes, a plurality of first historical leveling values corresponding to the first target roll system information are called, and the leveling value of the suggested current roll gap is calculated; if not, whether second target roller system information matched with the supporting roller number and the step number of the step pad of the current roller system information exists or not is searched in the database; if yes, a plurality of second historical leveling values corresponding to the second target roll system information are called, and the leveling value of the suggested current roll gap is calculated; and if not, calling the third historical leveling value from the database for a plurality of times, and calculating the suggested leveling value of the current roll gap. The problems that deviation exists between a traditional preset roll gap leveling value and actual working condition requirements, and production faults such as strip steel deviation and steel stacking are likely to happen are solved.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for steel rolling, and in particular to a method for matching the leveling value of the opening roll gap in hot continuous rolling finishing mill. Background Technology

[0002] In the finishing process of hot strip rolling, the precise setting of the roll gap leveling value directly determines the strip shape quality and the stability of the rolling process. In existing technologies, the setting of the roll gap leveling value mainly relies on manual input by operators based on experience or preset based on static models, resulting in insufficient real-time responsiveness and a lack of adaptive capability.

[0003] During the initial rolling stage after roll change, the state of the roll system (including key components such as work rolls, support rolls, and step pads) undergoes dynamic changes. The traditional preset roll gap leveling value deviates from the actual working conditions, which can easily lead to production failures such as strip deviation, thickness fluctuation, and steel piling, seriously affecting production efficiency and yield.

[0004] Existing adjustment methods based on historical data have significant technical flaws: some schemes simply record historical leveling values ​​without establishing a precise matching mechanism with the roller system, resulting in low matching accuracy; some schemes do not process abnormal data, making them susceptible to interference from extreme values; at the same time, existing methods lack effective backup schemes when there is no matching historical data, which can easily cause production interruptions.

[0005] Therefore, how to provide a method for matching the leveling value of the roll gap in hot continuous rolling finishing mill to at least partially improve the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for matching the leveling value of the roll gap in hot continuous rolling finishing mills. This method ensures that the generated suggested leveling value for the current roll gap tends to a stable and reliable level under the current operating conditions, thereby further improving the stability and consistency of the rolling process. Simultaneously, through multi-level matching, it ensures that a reasonable leveling value for the current roll gap can be generated under different operating conditions, avoiding production interruptions. This solves the problem that deviations between traditional preset roll gap leveling values ​​and actual operating conditions can easily lead to production failures such as strip misalignment, thickness fluctuations, and steel accumulation.

[0007] To achieve the above objectives, the present invention provides a method for matching the leveling value of the opening roll gap in hot continuous rolling finishing mills, comprising: Extract the current roll system information of the machine after the roll change and rolling starts; Search the database for first target roll system information that matches all the contents of the current roll system information; if so, retrieve several first historical leveling values ​​corresponding to the first target roll system information, and calculate the suggested leveling value for the current roll gap based on the first historical leveling values. If not, search the stored roller system information in the database for a second target roller system information that matches the support roller number and step pad number of the current roller system information; if it does, retrieve several second historical leveling values ​​corresponding to the second target roller system information, and calculate the suggested leveling value for the current roller gap based on the second historical leveling values. If not, retrieve several third historical leveling values ​​from the database and calculate the suggested leveling value for the current roll gap based on the third historical leveling values.

[0008] In one possible implementation, the step of retrieving several first historical leveling values ​​corresponding to the first target roller system information specifically involves: Set a first quantity threshold a; Obtain all first historical leveling values ​​associated with the first target roller system information as a first candidate set; Determine the relationship between the actual number g of the first historical balance value in the first candidate set and the first quantity threshold a.

[0009] In one possible implementation, when the determination result is that the actual number g is less than or equal to the first quantity threshold a, the step of calculating the suggested leveling value of the current roll gap based on the first historical leveling value is as follows: Calculate the arithmetic mean of all g first historical leveling values ​​in the first candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0010] In one possible implementation, when the determination result is that the actual number g is greater than the first quantity threshold a, the specific step of calculating the suggested leveling value of the current roll gap based on the first historical leveling value is as follows: Select the a most recently stored first historical balancing values ​​from the first candidate set; For the selected a first historical leveling values, the extreme value removal and averaging algorithm is used to calculate the leveling value, and the calculation result is used as the suggested leveling value for the current roll gap.

[0011] In one possible implementation, the step of retrieving several second historical leveling values ​​corresponding to the second target roller system information specifically involves: Set a second quantity threshold b; Obtain all second historical leveling values ​​associated with the second target roll system information as a second candidate set; Determine the relationship between the actual number g of the second historical balancing values ​​in the second candidate set and the second quantity threshold b.

[0012] In one possible implementation, when the determination result is that the actual number g is less than or equal to the second quantity threshold b, the specific step of calculating the suggested leveling value of the current roll gap based on the second historical leveling value is as follows: Calculate the arithmetic mean of all g second historical leveling values ​​in the second candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0013] In one possible implementation, when the determination result is that the actual number g is greater than the second quantity threshold b, the specific step of calculating the suggested leveling value of the current roll gap based on the second historical leveling value is as follows: Select the b most recently stored second historical balancing values ​​from the second candidate set; For the selected b second historical leveling values, the extreme value removal and averaging algorithm is used to calculate, and the calculation result is used as the suggested leveling value for the current roll gap.

[0014] In one possible implementation, the step of retrieving several third historical balancing values ​​from the database specifically involves: Set a third quantity threshold c; Obtain all third-historical leveling values ​​as the third candidate set; Determine the relationship between the actual number g of the third historical balance value in the third candidate set and the third quantity threshold c.

[0015] In one possible implementation, when the determination result is that the actual number g is less than or equal to the third quantity threshold c, the specific step of calculating the suggested current roll gap leveling value based on the third historical leveling value is as follows: Calculate the arithmetic mean of all g third historical leveling values ​​in the third candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0016] In one possible implementation, when the determination result is that the actual number g is greater than the third quantity threshold c, the specific step of calculating the suggested leveling value of the current roll gap based on the third historical leveling value is as follows: Select the c most recently stored third historical balancing values ​​from the third candidate set; For the selected c third historical leveling values, the extreme value removal and averaging algorithm is used to calculate, and the calculation result is used as the suggested leveling value for the current roll gap.

[0017] Compared to existing technologies, the technical solution provided by this invention has at least the following beneficial effects: First, it searches the stored roll system information in the database for a first target roll system that matches all the contents of the current roll system information. Then, it uses a first historical leveling value stored in the database associated with the first target roll system information to achieve a precise match between the current roll gap leveling value and the operating condition. If no first target roll system information matches all the contents of the current roll system information, it searches the stored roll system information in the database for a second target roll system that matches the support roll number and step pad number of the current roll system information. Then, it uses a second historical leveling value stored in the database associated with the second target roll system information to achieve a precise match between the current roll gap leveling value and the operating condition. If no second target roll system information matches the support roll number and step pad number of the current roll system information, it retrieves several third historical leveling values ​​and calculates a suggested current roll gap leveling value based on these third historical leveling values. This setup ensures that the generated suggested current roll gap leveling value tends towards a stable and reliable level under the operating condition, thereby further improving the stability and consistency of the rolling process. Meanwhile, through multi-level matching, it is ensured that a reasonable leveling value for the current roll gap can be generated under different working conditions, thus avoiding production interruptions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the hot continuous rolling finishing mill roll gap leveling value matching method provided in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0023] The purpose of this invention is to provide a method for matching the leveling value of the roll gap in hot continuous rolling finishing mills. This method ensures that the generated suggested leveling value for the current roll gap tends to a stable and reliable level under the current operating conditions, thereby further improving the stability and consistency of the rolling process. Simultaneously, through multi-level matching, it ensures that a reasonable leveling value for the current roll gap can be generated under different operating conditions, avoiding production interruptions. This solves the problem that deviations between traditional preset roll gap leveling values ​​and actual operating conditions can easily lead to production failures such as strip misalignment, thickness fluctuations, and steel accumulation.

[0024] Please see Figure 1 To achieve the above objectives, this invention provides a method for matching the leveling value of the opening roll gap in a hot strip finishing mill. The method is described below using any stand in a hot strip finishing mill system as the implementation object. The method includes: After the roll change and rolling begins, extract the current roll system information of the machine. The current roll system information includes the work roll number (e.g., WR-001), support roll number (e.g., BR-001), and step number (e.g., 3 steps) of the stand.

[0025] The system searches the stored roll system information in the database for a first target roll system that matches all the contents of the current roll system information. If found, it retrieves several first historical leveling values ​​corresponding to the first target roll system information and calculates the suggested current roll gap leveling value based on these first historical leveling values. The database includes roll system information and historical leveling values. After each roll change operation, key information such as the work roll number, support roll number, and step pad number of each stand is stored in the database to form roll system information. The system automatically collects the roll gap leveling values ​​of each stand within a preset time after the finishing strip threading is completed. When the subsequent strip head is detected by the pre-flying shear thermal detector, the previously recorded leveling value is sent out as a pre-swing value. The system retrieves the leveling values ​​of each stand within a preset time after the second strip rolled after the roll change is threaded, stores them in the database as historical leveling values, and associates them with the corresponding stand's roll system information. The preset time can be, but is not limited to, 8 seconds and can be adjusted according to actual conditions.

[0026] If not, search the stored roll system information in the database for a second target roll system information that matches the current roll system information, specifically the support roll number (e.g., BR-001) and the step pad number (e.g., 3 steps). If it does, retrieve several second historical leveling values ​​corresponding to the second target roll system information and calculate the suggested leveling value for the current roll gap based on the second historical leveling values.

[0027] If not, retrieve several third historical leveling values ​​from the database and calculate the suggested leveling value for the current roll gap based on the third historical leveling values.

[0028] First, the system searches the stored roll system information in the database for a first target roll system that matches all the contents of the current roll system information. Using the first historical leveling value associated with the first target roll system information stored in the database, the current roll gap leveling value is precisely matched with the operating condition. If no first target roll system information matches all the contents of the current roll system information, the system searches the stored roll system information in the database for a second target roll system that matches the support roll number and step pad number of the current roll system information. Using the second historical leveling value associated with the second target roll system information stored in the database, the current roll gap leveling value is precisely matched with the operating condition. If no second target roll system information matches the support roll number and step pad number of the current roll system information, the system retrieves several third historical leveling values ​​and calculates a suggested current roll gap leveling value based on these third historical leveling values. This setup ensures that the generated suggested current roll gap leveling value tends towards a stable and reliable level under the operating condition, thereby further improving the stability and consistency of the rolling process. Meanwhile, through multi-level matching, it is ensured that a reasonable leveling value for the current roll gap can be generated under different working conditions, thus avoiding production interruptions.

[0029] In one possible implementation, the step of retrieving several first historical leveling values ​​corresponding to the first target roller system information specifically involves: Set a first quantity threshold a; where the first quantity threshold a is a settable parameter, for example a=5.

[0030] Obtain all first historical leveling values ​​associated with the first target roller system information as a first candidate set; Determine the relationship between the actual number g of the first historical balance value in the first candidate set and the first quantity threshold a.

[0031] When the judgment result is that the actual number g is less than or equal to the first quantity threshold a, the specific steps for calculating the suggested leveling value of the current roll gap based on the first historical leveling value are as follows: Calculate the arithmetic mean of all g first historical leveling values ​​in the first candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0032] For example, if the actual number g of the first historical leveling values ​​in the first candidate set is 3, and the corresponding three first historical leveling values ​​are 1.2mm, 1.3mm, and 1.1mm respectively, then the suggested leveling value of the current roll gap can be calculated as 1.2mm based on (1.2+1.3+1.1) / 3=1.2mm.

[0033] When the judgment result is that the actual number g is greater than the first quantity threshold a, the specific steps for calculating the suggested leveling value of the current roll gap based on the first historical leveling value are as follows: Select the a most recently stored first historical balancing values ​​from the first candidate set; For the selected 'a' first historical leveling values, an extreme value removal and averaging algorithm is used to calculate the recommended leveling value for the current roll gap. The extreme value removal and averaging algorithm calculates the average value after removing one maximum and one minimum value. This algorithm eliminates interference from outlier data, ensuring the stability and accuracy of the recommended leveling value for the current roll gap.

[0034] For example, when the actual number of first historical leveling values ​​in the first candidate set is 6, the 5 most recently stored first historical leveling values ​​can be selected from these 6. For instance, the 5 first historical leveling values ​​are 1.2mm, 1.3mm, 1.1mm, 1.4mm, and 1.0mm. The extreme value removal and averaging method is used to remove the maximum value of 1.4mm and the minimum value of 1.0mm. The average value of the remaining values ​​of 1.2mm, 1.3mm, and 1.1mm is calculated. Based on (1.2+1.3+1.1) / 3=1.2mm, the suggested leveling value for the current roll gap is calculated to be 1.2mm.

[0035] In one possible implementation, the step of retrieving several second historical leveling values ​​corresponding to the second target roller system information specifically involves: Set a second quantity threshold b; where the second quantity threshold b is a settable parameter, for example b=5.

[0036] Obtain all second historical leveling values ​​associated with the second target roll system information as a second candidate set; Determine the relationship between the actual number g of the second historical balancing values ​​in the second candidate set and the second quantity threshold b.

[0037] When the judgment result is that the actual number g is less than or equal to the second quantity threshold b, the specific steps for calculating the suggested current roll gap leveling value based on the second historical leveling value are as follows: Calculate the arithmetic mean of all g second historical leveling values ​​in the second candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0038] For example, if the actual number g of the second historical leveling values ​​in the second candidate set is 4, and the corresponding four second historical leveling values ​​are 1.2mm, 1.2mm, 1.3mm, and 1.1mm respectively, then the suggested leveling value of the current roll gap can be calculated as 1.2mm based on (1.2+1.2+1.3+1.1) / 4=1.2mm.

[0039] When the judgment result is that the actual number g is greater than the second quantity threshold b, the specific steps for calculating the suggested leveling value of the current roll gap based on the second historical leveling value are as follows: Select the b most recently stored second historical balancing values ​​from the second candidate set; For the selected b second historical leveling values, an extreme value removal and averaging algorithm is used to calculate the recommended leveling value for the current roll gap. This extreme value removal and averaging algorithm eliminates interference from outlier data, ensuring the stability and accuracy of the recommended leveling value for the current roll gap.

[0040] For example, when the actual number of second historical leveling values ​​in the second candidate set is 8, the 5 most recently stored second historical leveling values ​​can be selected from these 8 values. For instance, the 5 second historical leveling values ​​are 1.2mm, 1.3mm, 1.1mm, 1.5mm, and 1.0mm. The extreme value removal and averaging method is used to remove the maximum value of 1.5mm and the minimum value of 1.0mm. The average value of the remaining values ​​of 1.2mm, 1.3mm, and 1.1mm is calculated. Based on (1.2+1.3+1.1) / 3=1.2mm, the suggested leveling value for the current roll gap is calculated to be 1.2mm.

[0041] In one possible implementation, the step of retrieving several third historical balancing values ​​from the database specifically involves: Set a third quantity threshold c; where the second quantity threshold c is a settable parameter, for example, c=4.

[0042] Obtain all third-historical leveling values ​​as the third candidate set; Determine the relationship between the actual number g of the third historical balance value in the third candidate set and the third quantity threshold c.

[0043] When the judgment result is that the actual number g is less than or equal to the third quantity threshold c, the specific steps for calculating the suggested current roll gap leveling value based on the third historical leveling value are as follows: Calculate the arithmetic mean of all g third historical leveling values ​​in the third candidate set, and use this arithmetic mean as the suggested leveling value for the current roll gap.

[0044] For example, if the actual number g of the third historical leveling values ​​in the third candidate set is 4, and the corresponding four third historical leveling values ​​are 1.0mm, 1.1mm, 1.2mm and 1.3mm respectively, then the suggested leveling value of the current roll gap can be calculated as 1.15mm based on (1.0+1.1+1.2+1.3) / 4=1.15mm.

[0045] When the judgment result is that the actual number g is greater than the third quantity threshold c, the specific steps for calculating the suggested leveling value of the current roll gap based on the third historical leveling value are as follows: Select the c most recently stored third historical balancing values ​​from the third candidate set; For the selected c third-historical leveling values, an extreme value removal and averaging algorithm is used to calculate the recommended leveling value for the current roll gap. This extreme value removal and averaging algorithm eliminates interference from outlier data, ensuring the stability and accuracy of the recommended leveling value for the current roll gap.

[0046] For example, when the actual number of third historical leveling values ​​in the third candidate set is 8, the 4 most recently stored third historical leveling values ​​can be selected from the 8 third historical leveling values. For example, the 4 third historical leveling values ​​are 1.2mm, 1.3mm, 1.1mm, and 1.5mm. The extreme value averaging method is used to remove the maximum value of 1.5mm and the minimum value of 1.1mm. The average value of the remaining values ​​1.2mm and 1.3mm is calculated. Based on (1.2+1.3) / 2=1.25mm, the suggested leveling value for the current roll gap is calculated to be 1.25mm.

[0047] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A method for matching the leveling value of the opening roll gap in hot continuous rolling finishing mill, characterized in that, include: Extract the current roll system information of the machine after the roll change and rolling starts; Search the database for a first target roll system that matches all the contents of the current roll system information; If so, retrieve several first historical leveling values ​​corresponding to the first target roll system information, and calculate the suggested leveling value for the current roll gap based on the first historical leveling values. If not, then search in the stored roller system information in the database for a second target roller system information that matches the support roller number and step pad number of the current roller system information; if so, retrieve several second historical leveling values ​​corresponding to the second target roller system information, and calculate the suggested leveling value of the current roller gap based on the second historical leveling values. If not, retrieve several third historical leveling values ​​from the database, and calculate the suggested leveling value for the current roll gap based on the third historical leveling values.

2. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 1, characterized in that, The step of retrieving several first historical leveling values ​​corresponding to the first target roller system information is specifically as follows: Set a first quantity threshold a; Obtain all the first historical leveling values ​​associated with the first target roller system information as a first candidate set; Determine the relationship between the actual number g of the first historical balancing values ​​in the first candidate set and the first quantity threshold a.

3. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 2, characterized in that, When the determination result is that the actual number g is less than or equal to the first quantity threshold a, the step of calculating the suggested leveling value of the current roll gap based on the first historical leveling value is as follows: Calculate the arithmetic mean of all g first historical leveling values ​​in the first candidate set, and use this arithmetic mean as the suggested current roll gap leveling value.

4. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 2, characterized in that, When the determination result is that the actual number g is greater than the first quantity threshold a, the step of calculating the suggested leveling value of the current roll gap based on the first historical leveling value is as follows: Select the a most recently stored first historical balancing values ​​from the first candidate set; For the selected a first historical leveling values, the extreme value removal averaging algorithm is used to calculate, and the calculation result is used as the suggested current roll gap leveling value.

5. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 1, characterized in that, The specific steps for retrieving the several second historical leveling values ​​corresponding to the second target roller system information are as follows: Set a second quantity threshold b; Obtain all the second historical leveling values ​​associated with the second target roller system information as a second candidate set; Determine the relationship between the actual number g of the second historical balancing values ​​in the second candidate set and the second quantity threshold b.

6. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 5, characterized in that, When the determination result is that the actual number g is less than or equal to the second quantity threshold b, the step of calculating the suggested leveling value of the current roll gap based on the second historical leveling value is as follows: Calculate the arithmetic mean of all g of the second historical leveling values ​​in the second candidate set, and use this arithmetic mean as the suggested current roll gap leveling value.

7. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 5, characterized in that, When the determination result is that the actual number g is greater than the second quantity threshold b, the step of calculating the suggested leveling value of the current roll gap based on the second historical leveling value is as follows: Select b of the most recently stored second historical balancing values ​​from the second candidate set; For the selected b second historical leveling values, the extreme value removal averaging algorithm is used to calculate, and the calculation result is used as the suggested current roll gap leveling value.

8. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 1, characterized in that, The specific steps for retrieving several third-historical adjustment values ​​from the database are as follows: Set a third quantity threshold c; Obtain all the aforementioned third historical leveling values ​​as the third candidate set; Determine the relationship between the actual number g of the third historical balancing value in the third candidate set and the third quantity threshold c.

9. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 8, characterized in that, When the determination result is that the actual number g is less than or equal to the third quantity threshold c, the step of calculating the suggested leveling value of the current roll gap based on the third historical leveling value is as follows: Calculate the arithmetic mean of all g of the third historical leveling values ​​in the third candidate set, and use this arithmetic mean as the suggested current roll gap leveling value.

10. The method for matching the leveling value of the opening roll gap in hot continuous rolling mill according to claim 8, characterized in that, When the determination result is that the actual number g is greater than the third quantity threshold c, the step of calculating the suggested leveling value of the current roll gap based on the third historical leveling value is as follows: From the third candidate set, select the c most recently stored third historical balancing values; For the selected c third historical leveling values, the extreme value removal averaging algorithm is used to calculate, and the calculation result is used as the suggested current roll gap leveling value.

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