A method and device for controlling the thickening of a pipe section and for sharpening the head and tail of a seamless steel pipe during sizing

Abstract

This invention relates to the field of seamless steel pipe rolling technology, and proposes a method and apparatus for controlling pipe section thickness increase and head and tail sharpening during the sizing process of seamless steel pipes. The method includes: acquiring data parameters; calculating the wall thickness increase and length at the pipe end by fitting the pipe thickness increase data during the sizing process based on specification data and production process parameters; calculating the total sharpening parameters based on the principle of equal metal volumetric flow rate per second, and distributing the total sharpening parameters to each stand of the continuous rolling mill, while simultaneously calculating the motor speed adjustment value for each stand; calculating the delay time required for tail sharpening at each stand based on relevant parameters of the continuous rolling mill and the sharpening parameters of each stand; performing the sharpening operation, and comprehensively evaluating the head and tail sharpening effect based on the actual wall thickness data of the pipe end after sharpening. This invention optimizes the calculation model for sharpening amount and length based on steel pipe specifications and thickness increase patterns, dynamically adjusts rolling mill parameters, and ensures the accuracy and stability of the sharpening process, thereby reducing pipe end thickness increase and improving steel pipe yield.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe rolling technology, and in particular to a method and apparatus for controlling the thickening of pipe sections and sharpening the ends during the sizing process of seamless steel pipes. Background Technology

[0002] In the production process of hot-rolled seamless steel pipes, the unsteady rolling caused by the establishment and disappearance of tension during the sizing stage can easily lead to localized wall thickness increases at the beginning and end of the pipe. This defect causes the product to fail to meet standards, requiring the removal of the excess portion, which directly reduces the yield and production efficiency, increases production costs, and has become a key problem that has long restricted the improvement of quality and efficiency in the industry.

[0003] To compensate for end thickening, the widely adopted "sharpening" technique pre-thinns the ends of the rough tube during continuous rolling. However, existing technologies still have significant shortcomings: First, current research largely focuses on single factors or offline static models based on fixed specifications, lacking a systematic consideration of the dynamic coupling relationship between rolling parameters, material properties, and equipment status, resulting in weak model generalization ability. Second, existing control methods fail to achieve good dynamic real-time adjustment, cannot effectively respond to fluctuations in incoming material dimensions and changes in operating conditions, and are prone to undercompensation or overcompensation, resulting in limited control accuracy and stability. Furthermore, there is a failure to fully consider the characteristics of each stand's equipment, such as the impact of roll diameter and response delay on process execution, causing discrepancies between theoretical models and actual control effects.

[0004] Therefore, there is a need in the existing technology to improve the method of controlling the thickness increase of the pipe section during the sizing process of seamless steel pipes, namely the head and tail tapering method. Summary of the Invention

[0005] This invention provides a method and apparatus for controlling the thickening of pipe sections and sharpening the ends during the sizing process of seamless steel pipes. This invention combines the thickening law and the sharpening process requirements during the sizing process of seamless steel pipes, optimizes the calculation model of the sharpening amount and sharpening length, and dynamically adjusts the roll speed and sharpening delay time to ensure the accuracy and stability of the sharpening process, thereby reducing the thickness of the pipe ends and improving the yield and economic benefits.

[0006] The technical solution of the present invention is as follows: On the one hand, a method for controlling the thickness increase of pipe sections and sharpening the ends during the sizing process of seamless steel pipes is provided, the method including: S1 obtains the specification data of seamless steel pipes and the production process parameters of the continuous rolling mill; S2 calculates the wall thickness and thickness increase at the pipe end based on specification data and production process parameters by fitting the pipe thickness increase data during the sizing process. Based on the principle of equal metal volumetric flow rate per second, S3 calculates the total sharpening parameters required to achieve tube end sharpening according to the wall increase and thickness increase length, and distributes the total sharpening parameters to each stand of the continuous rolling mill, while calculating the motor speed adjustment value of each stand. S4 calculates the delay time required for tail tipping of each stand based on relevant parameters of the continuous rolling mill and the tipping parameters of each stand. S5 performs the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame, and the delay time of the tail sharpening. It also comprehensively evaluates the head and tail sharpening effect by combining the actual wall thickness data of the steel pipe end after sharpening.

[0007] In some implementations, in S1, the steel pipe specification data includes at least the outer diameter of the rough pipe, the outer diameter of the finished pipe, the wall thickness of the finished pipe, the wall thickness of the rough pipe, the length of the finished pipe, and the length of the rough pipe. The production process parameters include at least the diameter of the rolls of each stand, the spacing between stands, the reduction ratio of the reducer, the linear velocity of the steel pipe at the outlet of the last stand, and the cross-sectional area of ​​the steel pipe at the outlet of each stand.

[0008] In some implementations, the method for calculating the wall thickness increase in S2 includes: For wall thickness specifications s For steel pipes ≤13mm thick, the formula for calculating the wall thickness increase is:

[0009] For wall thickness specifications s For steel pipes with a diameter of ≥13mm, the formula for calculating the wall thickness increase is:

[0010] Where, Δ s To increase wall thickness; d K The outer diameter of the rough pipe; d R This refers to the outer diameter of the finished pipe. s R The thickness is the wall thickness of the finished pipe.

[0011] In some implementations, the method for calculating the thickness length in S2 includes: Based on the law of constant volume during plastic deformation of metals, the total elongation during the entire sizing process can be calculated. λ L :

[0012] in, λ i The elongation of each stand of the sizing mill; F K This refers to the cross-sectional area of ​​the unfinished pipe. F R This refers to the cross-sectional area of ​​the exported steel pipe; Thickening length L VE The calculation process is as follows:

[0013] in, C d The spacing between the frames of the sizing machine; s K The walls of the wasteland are thick.

[0014] In some implementations, the total sharpening parameter is calculated in S3 as follows:

[0015] Where δ represents the target values ​​for the rough tube wall thickness and the continuous rolling wall thickness. sK Deviation; In some implementations, in S3, allocating the total sharpening parameters to each stand of the continuous rolling mill includes: Based on the elongation rate before and after sizing of the steel pipe μ Further calculations yield the sharpened length. d L Calculation formula:

[0016] In the formula, L R This refers to the length of the finished pipe. L K This refers to the length of the rough pipe; κ The length fluctuation coefficient (1.05~1.15) is adaptively adjusted depending on the rolling speed.

[0017] Elongation of each rack μ i Sharpening length of each frame d Li Proportional, the ratio of the elongation ratios can be used to obtain the ratio of the sharpening lengths of each frame:

[0018] Based on total sharpening amount d H The amount of sharpening is allocated to each frame:

[0019] in i For the first iThe specific gravity coefficient of the frame tipping amount is defined as follows:

[0020] in, W i This represents the percentage of the sharpened length corresponding to the frame. f i This is a function for the equipment's sharpening capability. D i For the first i The diameter of the mill rolls; γ is the response attenuation coefficient, representing the intensity of the influence of roll size on control sensitivity. This coefficient can be obtained by curve fitting or model calibration, combined with historical tipping execution response curves.

[0021] In some implementations, in S3, calculating the speed adjustment value for each rack motor includes: Working diameter of the rolls D ki The rotational speed of the rolls and the motor speed of each stand can be calculated. (Roll rotational speed of each stand) η i The calculation formula is as follows:

[0022] in, v n The velocity of the steel pipe exiting the final frame; A n This refers to the cross-sectional area of ​​the steel pipe at the outlet of the final frame; A i The cross-sectional area of ​​the steel pipe at the outlet of each frame; D ki The working diameter of the rolls in each stand; Then by the first i Reduction ratio of the gear reducer i i The rotational speed Ω of each frame motor can be obtained. i : .

[0023] In some implementations, the formula for calculating the delay time required for tail tip sharpening in S4 is as follows:

[0024] in, t delay i For the first iRack delay time; t pass i The time taken for each frame to pass through is the time when the steel throwing signal is triggered on the first frame and the time taken for the second frame to pass through. i The time difference between the triggering times of the steel throwing signal on the frame; t taper i For the sharpening time of each rack; L i-1，i For the first i -1 rack and the first i Rack spacing of the table racks; v i For the first i The speed of the steel pipe line exiting the machine frame.

[0025] In some implementations, in S5, the comprehensive evaluation of the tipping effect includes: if the amount of pipe end sawing is reduced by 60% or more after tipping compensation, it is considered as effective compensation.

[0026] On the other hand, the present invention also provides a device for controlling the thickness of pipe sections and sharpening the ends during the sizing process of seamless steel pipes. The device is used to implement the method for controlling the thickness of pipe sections and sharpening the ends during the sizing process of seamless steel pipes as described above. The device includes: The data acquisition module is configured to acquire the specification data of seamless steel pipes and the production process parameters of the continuous rolling mill. The first calculation module is configured to calculate the wall thickness and thickness length at the pipe end by fitting the pipe thickness data during the sizing process based on specification data and production process parameters. The second calculation module is configured to calculate the total sharpening parameters required to achieve tube end sharpening based on the principle of equal metal volumetric flow rate per second, according to the wall increase and thickness increase length, and distribute the total sharpening parameters to each stand of the continuous rolling mill, while calculating the motor speed adjustment value of each stand. The third calculation module is configured to calculate the delay time required for tail tipping of each stand based on relevant parameters of the continuous rolling mill and the tipping parameters of each stand. The evaluation module is configured to perform the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame, and the delay time of the tail sharpening. Combined with the actual wall thickness data of the steel pipe end after sharpening, the head and tail sharpening effects are comprehensively evaluated.

[0027] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: This method dynamically acquires production data and analyzes the thickness increase pattern. Based on the principle of equal metal volumetric flow rate per second, it calculates and allocates the tipping parameters and motor speed adjustment values ​​for each frame in real time, while precisely controlling the tail tipping delay. This method effectively overcomes the shortcomings of traditional static tipping models, significantly improves tipping accuracy and end wall thickness quality, reduces the amount of pipe end sawing by more than 60%, greatly improves yield and production efficiency, and enhances the adaptability and stability of the control system to different working conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of a method for controlling pipe section thickness and tipping the ends during the sizing process of a seamless steel pipe, provided by an embodiment of the present invention. Figure 2 This is a flowchart of a head and tail tapering setting model provided in an embodiment of the present invention; Figure 3 This is the IMS wall thickness curve of the end of the Φ180×18mm rough pipe provided in the embodiment of the present invention; Figure 4 This is the wall thickness curve at the saw cut of a Φ180×18mm steel pipe provided in this embodiment of the invention; Figure 5 This is a block diagram of a seamless steel pipe sizing process pipe section thickening control and head and tail sharpening device provided in an embodiment of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0031] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0032] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0033] In this embodiment of the invention, sometimes a subscript such as W1 may be mistakenly written as a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0034] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0035] This invention provides a method for controlling the thickness increase of pipe sections and sharpening the ends during the sizing process of seamless steel pipes, such as... Figure 1 The flowchart shown illustrates the method for controlling pipe section thickness and tip tapering during the sizing process of seamless steel pipes. This method may include the following steps: S1 obtains the specification data of seamless steel pipes and the production process parameters of the continuous rolling mill; S2 calculates the wall thickness and thickness increase at the pipe end based on specification data and production process parameters by fitting the pipe thickness increase data during the sizing process. Based on the principle of equal metal volumetric flow rate per second, S3 calculates the total sharpening parameters required to achieve tube end sharpening according to the wall increase and thickness increase length, and distributes the total sharpening parameters to each stand of the continuous rolling mill, while calculating the motor speed adjustment value of each stand. S4 calculates the delay time required for tail tipping of each stand based on relevant parameters of the continuous rolling mill and the tipping parameters of each stand. S5 performs the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame, and the delay time of the tail sharpening. It also comprehensively evaluates the head and tail sharpening effect by combining the actual wall thickness data of the steel pipe end after sharpening.

[0036] Furthermore, in S1, the steel pipe specification data includes at least the outer diameter of the rough pipe, the outer diameter of the finished pipe, the wall thickness of the finished pipe, the wall thickness of the rough pipe, the length of the finished pipe, and the length of the rough pipe. The production process parameters include at least the diameter of the rolls of each stand, the spacing between stands, the reduction ratio of the reducer, the linear velocity of the steel pipe at the exit of the last stand, and the cross-sectional area of ​​the steel pipe at the exit of each stand.

[0037] Furthermore, in S2, the method for calculating the wall thickness includes: For wall thickness specifications s For steel pipes ≤13mm thick, the formula for calculating the wall thickness increase is:

[0038] For wall thickness specifications s For steel pipes with a diameter of ≥13mm, the formula for calculating the wall thickness increase is:

[0039] Where, Δ s To increase wall thickness; d K The outer diameter of the rough pipe; d R This refers to the outer diameter of the finished pipe. s R The thickness is the wall thickness of the finished pipe.

[0040] The methods for calculating the thickening length include: Based on the law of constant volume during plastic deformation of metals, the total elongation during the entire sizing process can be calculated. λ L :

[0041] in, λ i The elongation of each stand of the sizing mill; F K This refers to the cross-sectional area of ​​the unfinished pipe. F R This refers to the cross-sectional area of ​​the exported steel pipe; Thickening length L VE The calculation process is as follows:

[0042] in, C d The spacing between the frames of the sizing machine; s K The walls of the wasteland are thick.

[0043] Furthermore, in S3, the total sharpening parameter is calculated as follows:

[0044] Where δ represents the target values ​​for the rough tube wall thickness and the continuous rolling wall thickness. sK Deviation; Furthermore, in S3, the allocation of the total sharpening parameters to each stand of the continuous rolling mill includes: Based on the elongation rate before and after sizing of the steel pipe μ Further calculations yield the sharpened length. d L Calculation formula:

[0045] In the formula, L R This refers to the length of the finished pipe. L K This refers to the length of the rough pipe; κ The length fluctuation coefficient (1.05~1.15) is adaptively adjusted depending on the rolling speed.

[0046] Elongation of each rack μ i Sharpening length of each frame d Li Proportional, the ratio of the elongation ratios can be used to obtain the ratio of the sharpening lengths of each frame:

[0047] Based on total sharpening amount d H The amount of sharpening is allocated to each frame:

[0048] in i For the first i The specific gravity coefficient of the frame tipping amount is defined as follows:

[0049] in, W i This represents the percentage of the sharpened length corresponding to the frame. f i This is a function for the equipment's sharpening capability. D i For the first i The diameter of the mill rolls; γ is the response attenuation coefficient, representing the intensity of the influence of roll size on control sensitivity. This coefficient can be obtained by curve fitting or model calibration, combined with historical tipping execution response curves.

[0050] The calculation of the motor speed adjustment values ​​for each rack includes: Working diameter of the rolls D ki The rotational speed of the rolls and the motor speed of each stand can be calculated. (Roll rotational speed of each stand) η i The calculation formula is as follows:

[0051] in, vn The velocity of the steel pipe exiting the final frame; A n This refers to the cross-sectional area of ​​the steel pipe at the outlet of the final frame; A i The cross-sectional area of ​​the steel pipe at the outlet of each frame; D ki The working diameter of the rolls in each stand; Then by the first i Reduction ratio of the gear reducer i i The rotational speed Ω of each frame motor can be obtained. i : .

[0052] Furthermore, in S4, the formula for calculating the delay time required for tail tip sharpening of each rack is as follows:

[0053] in, t delay i For the first i Rack delay time; t pass i The time taken for each frame to pass through is the time when the steel throwing signal is triggered on the first frame and the time taken for the second frame to pass through. i The time difference between the triggering times of the steel throwing signal on the frame; t taper i For the sharpening time of each rack; L i-1，i For the first i -1 rack and the first i Rack spacing of the table racks; v i For the first i The speed of the steel pipe line exiting the machine frame.

[0054] Furthermore, in S5, the comprehensive evaluation of the tipping effect includes: if the amount of pipe end sawing is reduced by 60% or more after tipping compensation, it is considered as effective compensation.

[0055] The present invention will be further explained below with reference to specific embodiments.

[0056] Using a seamless steel pipe with a specification of Φ180×18mm (outer diameter × wall thickness) from a certain seamless steel pipe factory as the experimental object, five steel pipes were selected to implement the rolling strategy given in this invention, and the following was performed: Figure 2 The process of setting the head and tail of the model is shown.

[0057] Step S1: Test the steel pipe specifications, as shown in Table 1; the continuous rolling mill production process parameters are shown in Table 2. Table 1 Information on the tested steel pipes

[0058] Table 2 Parameters of Continuous Rolling Mill Production Process

[0059] Step S2: For a steel pipe with a diameter of Φ180×18mm, the wall thickness increase at the head is Δ s 1 = 0.92mm, thickness increase length L VE1 =379mm, tail wall thickness Δ s 2 = 0.96mm, thickness increase length L VE2 =421mm.

[0060] Steps S3 and S4: Calculate the head and tail sharpening process parameters for the Φ180×18mm steel pipe based on the field data, as shown in Table 3. Table 3. Sharpening process parameters for Φ180×18mm steel pipes

[0061] Step S5: A comprehensive evaluation of the tapering effect of the seamless steel pipe ends is conducted. Table 4 compares the yield rates of the tapering experiment for Φ180×18mm steel pipes. It shows that the theoretical sawing allowance for the pipe ends can be increased by 400mm and 450mm respectively, and the theoretical yield rate can be increased by 0.56%. This meets the evaluation criterion that a reduction of 60% or more in the sawing allowance at the pipe ends is considered effective compensation. Furthermore, Figure 3 The IMS wall thickness curve for the end of a rough pipe with a specification of Φ180×18mm. Figure 4 The graph shows the wall thickness measurement curves for the cut ends of Φ180×18mm finished pipes. The blue dashed line represents the target wall thickness of the experimental batch of steel pipes, the green dashed line represents the specified wall thickness control accuracy range, and the red vertical line represents the theoretical cutting point. This point is determined by scanning wall thickness data from the pipe end towards the pipe body. When the wall thickness of all six measurement channels simultaneously reaches the target tolerance range (i.e., ≤ target wall thickness - 0.3mm), and the wall thickness of subsequent pipe sections remains stable and qualified, this point is marked as the theoretical cutting point. If the end of the steel pipe shows a significant wall thickness reduction trend (continuous thinning at multiple points at a rate >0.05mm / 10mm and the wall thickness is already below the target value of 0.2mm), the theoretical cutting position can be determined earlier based on trend prediction.

[0062] Table 4 Comparison of yield rates of steel pipes in the tipping experiment

[0063] Figure 5 This is a block diagram illustrating a seamless steel pipe sizing process section thickening control and end-to-end sharpening device according to an exemplary embodiment. The device is used for a seamless steel pipe sizing process section thickening control and end-to-end sharpening method. (Refer to...) Figure 5 The device includes: Data acquisition module 011 is configured to acquire specification data of seamless steel pipes and production process parameters of the continuous rolling mill; The first calculation module 012 is configured to calculate the wall thickness and thickness length of the pipe end by fitting the thickness data of the steel pipe during the sizing process based on specification data and production process parameters. The second calculation module 013 is configured to calculate the total sharpening parameters required to achieve tube end sharpening based on the principle of equal metal volume flow rate per second, according to the wall increase and thickness increase length, and distribute the total sharpening parameters to each stand of the continuous rolling mill, while calculating the motor speed adjustment value of each stand. The third calculation module 014 is configured to calculate the delay time required for tail tipping of each stand based on the relevant parameters of the continuous rolling mill and the tipping parameters of each stand. The evaluation module 015 is configured to perform the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame, and the delay time of the tail sharpening. Combined with the actual wall thickness data of the steel pipe end after sharpening, the head and tail sharpening effects are comprehensively evaluated.

[0064] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0065] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0066] In this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0067] It should be understood that, in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0068] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0069] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0070] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0071] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0072] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0073] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the thickness increase of pipe sections and sharpening the ends during the sizing process of seamless steel pipes, characterized in that, The method includes: S1 obtains the specification data of seamless steel pipes and the production process parameters of the continuous rolling mill; S2 calculates the wall thickness and thickness length at the pipe end based on the specification data and production process parameters, fitting the pipe thickness data during the sizing process. S3 is based on the principle of equal metal volumetric flow rate per second. It calculates the total sharpening parameters required to achieve tube end sharpening according to the wall increase and the thickness increase, and distributes the total sharpening parameters to each stand of the continuous rolling mill. At the same time, it calculates the motor speed adjustment value of each stand. S4 calculates the delay time required for tail tipping of each stand based on relevant parameters of the continuous rolling mill and the tipping parameters of each stand. S5 performs the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame and the delay time of the tail sharpening, and comprehensively evaluates the head and tail sharpening effect by combining the actual wall thickness data of the steel pipe end after sharpening. In S2, the method for calculating the wall thickness includes: For wall thickness specifications s For steel pipes ≤13mm thick, the formula for calculating the wall thickness increase is: For wall thickness specifications s For steel pipes with a diameter of ≥13mm, the formula for calculating the wall thickness increase is as follows: Where, Δ s To increase wall thickness; d K The outer diameter of the rough pipe; d R This refers to the outer diameter of the finished pipe. s R For the finished pipe wall thickness; In S2, the method for calculating the thickening length includes: Based on the law of constant volume during plastic deformation of metals, the total elongation during the entire sizing process can be calculated. λ L : in, λ i The elongation of each stand of the sizing mill; F K This refers to the cross-sectional area of ​​the unfinished pipe; F R This refers to the cross-sectional area of ​​the exported steel pipe; Thickening length L VE The calculation process is as follows: in, C d The spacing between the frames of the sizing machine; s K The walls of the rough pipe are thick; In S3, the method for calculating the total sharpening parameter is as follows: Where δ represents the target values ​​for the rough tube wall thickness and the continuous rolling wall thickness. sK Deviation; In S3, the allocation of the total sharpening parameters to each stand of the continuous rolling mill includes: Based on the elongation rate before and after sizing of the steel pipe μ Further calculations yield the sharpened length. d L Calculation formula: In the formula, L R This refers to the length of the finished pipe. L K This refers to the length of the rough pipe; κ The length fluctuation coefficient is set to a value of 1.05 to 1.15, and is adaptively adjusted depending on the rolling speed. Elongation of each rack μ i Sharpening length of each frame d Li Proportional, the ratio of elongation can be used to obtain the ratio of the sharpening length of each frame: Based on total sharpening amount d H The amount of sharpening is allocated to each frame: in Φ i For the first i The specific gravity coefficient of the frame tipping amount is defined as follows: in, W i This represents the percentage of the sharpened length corresponding to the frame. f i This is a function for the equipment's sharpening capability. D i For the first i The diameter of the mill rolls; γ is the response attenuation coefficient, which represents the intensity of the influence of roll size on control sensitivity. This coefficient can be obtained by combining historical tipping execution response curves through curve fitting or model calibration.

2. The method for controlling pipe section thickness increase and tipping during the sizing process of seamless steel pipes according to claim 1, characterized in that, In S1, the steel pipe specification data includes at least the outer diameter of the rough pipe, the outer diameter of the finished pipe, the wall thickness of the finished pipe, the wall thickness of the rough pipe, the length of the finished pipe, and the length of the rough pipe. The production process parameters include at least the diameter of each stand's rolls, the spacing between stands, the reduction ratio of the reducer, the linear velocity of the steel pipe at the outlet of the last stand, and the cross-sectional area of ​​the steel pipe at the outlet of each stand.

3. The method for controlling pipe section thickness increase and tip tapering during the seamless steel pipe sizing process according to claim 1, characterized in that, In S3, the calculation of the motor speed adjustment values ​​for each rack includes: Working diameter of the rolls D ki The rotational speed of the rolls and the motor speed of each stand can be calculated. η i The calculation formula is as follows: in, v n The velocity of the steel pipe exiting the final frame; A n This refers to the cross-sectional area of ​​the steel pipe at the outlet of the final frame; A i The cross-sectional area of ​​the steel pipe at the outlet of each frame; D ki The working diameter of the rolls in each stand; Then by the first i Reduction ratio of the gear reducer i i The rotational speed Ω of each frame motor can be obtained. i : 。 4. The method for controlling pipe section thickness increase and tip tapering during the seamless steel pipe sizing process according to claim 1, characterized in that, In S4, the formula for calculating the delay time required for tail tip sharpening of each rack is as follows: in, t delay i For the first i Rack delay time; t pass i The time taken for each frame to pass through is the time when the steel throwing signal is triggered on the first frame and the time taken for the second frame to pass through. i The time difference between the triggering times of the steel throwing signal on the frame; t taper i For the sharpening time of each rack; L i-1，i For the first i -1 rack and the first i Rack spacing of the table racks; v i For the first i The speed of the steel pipe line exiting the machine frame.

5. The method for controlling pipe section thickness increase and tipping during the sizing process of seamless steel pipes according to claim 1, characterized in that, In S5, the comprehensive evaluation of the tipping effect includes: if the amount of cutting at the pipe end is reduced by 60% or more after tipping compensation, it is considered to be effective compensation.

6. A device for controlling the thickness increase of pipe sections and sharpening the ends during the sizing process of seamless steel pipes, the device being used to implement the method for controlling the thickness increase of pipe sections and sharpening the ends during the sizing process of seamless steel pipes as described in any one of claims 1-5, characterized in that... The device includes: The data acquisition module is configured to acquire the specification data of seamless steel pipes and the production process parameters of the continuous rolling mill. The first calculation module is configured to calculate the wall thickness and thickness length at the pipe end by fitting the pipe thickness data during the sizing process based on specification data and production process parameters. The second calculation module is configured to calculate the total sharpening parameters required to achieve tube end sharpening based on the principle of equal metal volumetric flow rate per second, according to the wall increase and thickness increase length, and distribute the total sharpening parameters to each stand of the continuous rolling mill, while calculating the motor speed adjustment value of each stand. The third calculation module is configured to calculate the delay time required for tail tipping of each stand based on relevant parameters of the continuous rolling mill and the tipping parameters of each stand. The evaluation module is configured to perform the sharpening operation based on the motor speed adjustment value, the sharpening parameters of each frame, and the delay time of the tail sharpening. Combined with the actual wall thickness data of the steel pipe end after sharpening, the head and tail sharpening effects are comprehensively evaluated.

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