Threaded connection torque-corner method tightening method based on self-locking torque correction

Abstract

The invention provides a threaded connection torque-corner method tightening method based on self-locking torque correction. According to the invention, the fitting torque corresponding to each threaded connection can be calculated according to the test result of the self-locking torque, so that the fitting torque of each threaded connection is different, and the correction of the self-locking torque is realized, thereby greatly improving the pre-tightening force control precision, reducing the risk of failure of a connected piece due to low pre-tightening precision of the threaded connection, and improving the reliability of the connected piece. And the assembly stability of threaded connection is improved.

Description

Technical Field

[0001] The present invention relates to a bolt tightening process, and mainly relates to a tightening method of the torque-rotation angle method for threaded connections based on self-locking torque correction. Background Art

[0002] Threaded connections, as a structure with strong interchangeability and connection performance, are widely used in various mechanical equipment, such as the shells in rockets, engineering equipment machinery, etc., especially in the assembly of aero-engines. Threaded connections generally need to withstand alternating and impact loads of high temperature and high pressure during the service stage. The stability and reliability of the pre-tightening force generated by the clamping action of the threaded connection play a key role in the normal operation of the whole machine. In the actual assembly process of threaded connections in aero-engines, due to manufacturing errors, the pre-tightening forces generated by each bolt in the threaded connection are not necessarily uniform and stable. Especially when using the torque-rotation angle method for tightening, the self-locking nut closing process makes the dispersion of the self-locking torque relatively large, which in turn has a greater impact on the mating torque of the threaded connection. If the same mating torque is used for a batch of threaded connections, the control accuracy of the pre-tightening force during the tightening process will be greatly reduced, and the advantages of the torque-rotation angle method process cannot be effectively exerted.

[0003] Therefore, it is necessary to effectively solve the problem of the control accuracy of the pre-tightening force of threaded connections under the discrete distribution of self-locking torque, and effectively improve the stability of threaded connections in high-end equipment. Summary of the Invention

[0004] The present invention content is provided to introduce some concepts that will be further described in the following specific implementation manners in a simplified form. The present invention content is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0005] According to an embodiment of the present invention, there is provided a tightening method of torque-rotation angle method for threaded connection based on self-locking torque correction, including: (1) for each group of threaded connections among multiple groups of threaded connections, obtaining the self-locking torque of the self-locking nut in this group of threaded connections; (2) for each group of threaded connections among the multiple groups of threaded connections, obtaining the fitting torque of the self-locking nut in this group of threaded connections, and calculating the average fitting torque difference for the multiple groups of threaded connections at least partially based on the difference between the fitting torque of the self-locking nut in each group of threaded connections and the self-locking torque of the self-locking nut in this group of threaded connections; (3) calculating the tightening rotation angle for the multiple groups of threaded connections at least partially based on the maximum fitting pre-tightening force and the minimum fitting pre-tightening force of the multiple groups of threaded connections; and (4) for each group of threaded connections among the multiple groups of threaded connections, tightening the threaded connection by torque-rotation angle method at least partially using the corrected fitting torque of the self-locking nut in this group of threaded connections and the tightening rotation angle, wherein the corrected fitting torque is based on the self-locking torque of the self-locking nut in this group of threaded connections and the average fitting torque difference for the multiple groups of threaded connections.

[0006] According to another embodiment of the present invention, there is provided a tightening system of torque-rotation angle method for threaded connection based on self-locking torque correction, including: a self-locking torque obtaining module configured to: for each group of threaded connections among multiple groups of threaded connections, obtain the self-locking torque of the self-locking nut in this group of threaded connections; an average fitting torque difference calculating module configured to: for each group of threaded connections among the multiple groups of threaded connections, obtain the fitting torque of the self-locking nut in this group of threaded connections, and calculate the average fitting torque difference for the multiple groups of threaded connections at least partially based on the difference between the fitting torque of the self-locking nut in each group of threaded connections and the self-locking torque of the self-locking nut in this group of threaded connections; a tightening rotation angle calculating module configured to: calculate the tightening rotation angle for the multiple groups of threaded connections at least partially based on the maximum fitting pre-tightening force and the minimum fitting pre-tightening force of the multiple groups of threaded connections; and a torque-rotation angle method tightening execution module configured to: for each group of threaded connections among the multiple groups of threaded connections, tighten the threaded connection by torque-rotation angle method at least partially using the corrected fitting torque of the self-locking nut in this group of threaded connections and the tightening rotation angle, wherein the corrected fitting torque is based on the self-locking torque of the self-locking nut in this group of threaded connections and the average fitting torque difference for the multiple groups of threaded connections.

[0007] According to another embodiment of the present invention, there is provided a computing device for tightening by the torque-rotation angle method of thread connection based on self-locking torque correction, including: a processor; a memory storing instructions that, when executed by the processor, can execute the above method.

[0008] These and other features and advantages will become apparent by reading the following detailed description and referring to the associated drawings. It should be understood that the foregoing general description and the following detailed description are illustrative only and do not limit the various aspects claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to understand in detail the manner in which the above-described features of the present invention are used, the above briefly summarized content can be described more specifically with reference to the various embodiments, some aspects of which are shown in the drawings. However, it should be noted that the drawings only show certain typical aspects of the present invention and should not be considered to limit its scope, as the description may allow other equally effective aspects.

[0010] Figure 1 FIG. 12 shows a schematic diagram of a tightening method 100 of the torque-rotation angle method for thread connection based on self-locking torque correction according to one or more embodiments of the present invention.

[0011] Figure 2 FIG. 16 shows a torque change curve diagram during the process of measuring the self-locking torque of the nut.

[0012] Figure 3 FIG. 20 shows a torque change curve diagram during the process of measuring the difference in mating torque.

[0013] Figure 4 FIG. 24 shows a schematic diagram of a tightening system 400 of the torque-rotation angle method for thread connection based on self-locking torque correction according to one or more embodiments of the present invention.

[0014] Figure 5 FIG. 500 is a block diagram of an exemplary computing device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be described in detail below with reference to the drawings, and the features of the present invention will be further revealed in the following specific description.

[0016] Explanation of common terms (the following term explanations are not beyond their common meanings in the art):

[0017] Self-locking torque: For a nut with self-locking performance, when tightening the nut, it is the torque value when the threaded parts of the nut and the bolt are 100% fully engaged but have not yet contacted the part to be fastened.

[0018] Fitting torque: It refers to the torque when the connecting piece and the piece to be connected are tightened and fitted together, and it is the starting position of effective tightening (generating clamping force).

[0019] Torque-rotation angle control method: First, the bolt is tightened to a small torque (for example, the fitting torque), and then, starting from this point, a specified rotation angle is tightened.

[0020] Electric tightening tool: Generally composed of a motor, driving teeth, elbow gear, sensor, etc., it can relatively easily set the warning torque and the starting rotation angle.

[0021] The present invention can calculate the corresponding fitting torque for each threaded connection according to the test result of its self-locking torque, so that the fitting torques of each threaded connection are different, realizing the correction of the self-locking torque, thereby greatly improving the pre-tightening force control accuracy, reducing the risk of failure of the piece to be connected due to low pre-tightening accuracy of the threaded connection, and improving the assembly stability of the threaded connection.

[0022] Figure 1 The schematic diagram of a tightening method 100 of a torque-rotation angle method for threaded connections based on self-locking torque correction according to one or more embodiments of the present invention is shown.

[0023] At 105, for each group of threaded connections in multiple groups of threaded connections, the self-locking torque of the self-locking nut in this group of threaded connections is obtained.

[0024] According to an embodiment of the present invention, each group of threaded connections includes a self-locking nut, a bolt, and two or more pieces to be connected. According to another embodiment of the present invention, at least 30 groups of threaded connections can be adopted in the method 100. Of course, other numbers of groups of threaded connections are also within the protection scope of the present invention. Among them, the self-locking nuts and bolts in multiple groups of threaded connections have the same model, physical properties, etc. Generally speaking, they are self-locking nuts and bolts from the same batch.

[0025] Specifically, for each group of threaded connections in multiple groups of threaded connections, stage 105 may further include the following processes.

[0026] (1) Clean the bolt and the self-locking nut with acetone to remove all traces of oil stains, residues, etc., and clean and dry.

[0027] (2) Install the bolt on a special fixture, and apply grease on the surface of the first three turns of the threads of the bolt. Initially, tighten the self-locking nut by hand, and install the self-locking nut, the piece to be connected, and the bolt in multiple groups of threaded connections together.

[0028] (3) Tighten the self-locking nut with an electric tightening tool to the target torque value. Among them, the target torque value is set to 30% of the maximum tightening torque of the bolt of this specification, ensuring that it exceeds the maximum self-locking torque value of the self-locking nut, but within the safe torque range of the bolt connection.

[0029] (4) Adjust the angle of the tightening tool to 0°, loosen the self-locking nut by one turn, mark the loosening end point as the tightening starting point, and the electric tightening tool tightens the self-locking nut by half a turn again, and measure the magnitude of the tightening torque in real time during the tightening process.

[0030] (5) Based on the change in the tightening torque during the process of tightening the self-locking nut by half a turn again in the above (4) (as Figure 2 shown, where Figure 2 is the torque change curve graph during the process of measuring the self-locking torque of the nut of the present invention), record the maximum tightening torque during this tightening process as the self-locking torque T 1-i of the self-locking nut, and judge whether the self-locking torque T 1-i is within the qualified range. If it is unqualified, replace the self-locking nut. Among them, i is the index of each set of thread connections in multiple sets of thread connections. For example, the self-locking torque of the self-locking nut in the first set of thread connections obtained is T 1-1 .

[0031] Generally speaking, in stage 105, before performing the torque-angle method tightening described below, by tightening the self-locking nut multiple times, obtain the magnitude of the self-locking torque of each self-locking nut, and ensure that the self-locking torque is within the qualified range.

[0032] At 110, for each set of thread connections in the multiple sets of thread connections, obtain the seating torque of the self-locking nut in this set of thread connections, and calculate the average seating torque difference for the multiple sets of thread connections at least partially based on the difference between the seating torque of the self-locking nut in each set of thread connections and the self-locking torque of the self-locking nut in this set of thread connections (obtained in the above 105).

[0033] Specifically, stage 110 may further include the following processes.

[0034] (1) For each set of thread connections in the multiple sets of thread connections, tighten the self-locking nut with an electric tightening tool, and set the target torque value to 50% of the maximum tightening torque of the bolt of this specification. For example, Figure 3 shows the torque change curve graph during the process of measuring the seating torque difference of the present invention. Specifically, Figure 3 shows that the sensor measures the tightening torque and the rotation angle of the nut in real time. As shown in Figure 3 , by recording the torque curve of each set of thread connections, and obtaining the seating torque T 2-i of the self-locking nut of this set of thread connections through this torque curve.Among them, i is the index of each set of threaded connections in multiple sets of threaded connections. For example, the fitting torque of the self-locking nut in the obtained first set of threaded connections is T 2-1 .

[0035] (2) For each set of threaded connections in the multiple sets of threaded connections, subtract the self-locking torque value T 2-i of the self-locking nut from the fitting torque T 1-i of the self-locking nut of this set of threaded connections to obtain the differential torque T Δ-i of the self-locking nut. Among them, i is the index of each set of threaded connections in multiple sets of threaded connections. For example, the differential torque of the self-locking nut in the obtained first set of threaded connections is T Δ-1 .

[0036] (3) Average the differential torques of the self-locking nuts in each set of threaded connections in the multiple sets of threaded connections, and use the obtained average differential torque as the average fitting torque difference T Δ平均 in the subsequent torque-angle method. For example, if 30 sets of threaded connections are used, add the differential torques T Δ-i of the self-locking nuts in each set of the 30 sets of threaded connections and divide by 30 to obtain the average fitting torque difference T Δ平均 for the 30 sets of threaded connections.

[0037] Generally speaking, in stage 110, by analyzing and processing the bolt tightening torque curve, the statistical analysis method is used to determine the bolt fitting torque value under different self-locking torques, and the adaptive control process of the subsequent torque-angle method is realized.

[0038] In 115, calculate the tightening angle for the multiple sets of threaded connections at least partially based on the maximum fitting pre-tightening force and the minimum fitting pre-tightening force of the multiple sets of threaded connections.

[0039] Specifically, stage 115 may further include the following processes.

[0040] (1) Loosen the multiple sets of threaded connections so that the connected parts in each set of threaded connections are loosened from the self-locking nuts to conduct the angle / pre-tightening force change rate test.

[0041] (2) For each set of threaded connections in the multiple sets of threaded connections, tighten the self-locking nut with an electric tightening tool, and set the target torque value to 70% of the maximum tightening torque of the bolt of this specification. Obtain the pre-tightening force of the bolt through the ultrasonic pre-tightening force sensor and measure the tightening angle of the self-locking nut at the same time.

[0042] (3) For each set of threaded connections in the multiple sets of threaded connections, record the pre-tightening force-angle curve and determine the fitting pre-tightening force F st , and the pre-tightening force F finAnd the tightening rotation angle α during the process to obtain the slope value of the angle-preload force curve during the test tightening process, that is, the rotation angle / preload force change rate K C .

[0043]

[0044] (4) Determine the maximum assembly preload force F of the threaded connections in this multiple set of threaded connections Mzul , the maximum mating preload force F in this multiple set of threaded connections tmax and the minimum mating preload force F tmin , determine the maximum rotation angle α Mzul required to reach the maximum assembly preload force F max and the minimum rotation angle α min , where:

[0045]

[0046]

[0047] The tightening rotation angle adopted by the torque-rotation angle method is expressed as:

[0048]

[0049] In the above formulas: the maximum and minimum rotation angle / preload force change rates K Cmax and K cmin and the maximum and minimum mating preload forces F tmax and F tmin are obtained by testing, α max and α min are respectively the calculated maximum and minimum tightening rotation angles, and α A is the input rotation angle of the tightening tool.

[0050] Generally speaking, stage 115 proposes a calculation method for the tightening rotation angle of the torque-rotation angle method of threaded connections, and calculates the tightening rotation angle that meets the preload force design requirements according to the preload force-rotation angle relationship curve obtained by testing.

[0051] At 120, for each set of threaded connections in the multiple set of threaded connections, at least partially use the corrected mating torque of the self-locking nuts in this set of threaded connections and the tightening rotation angle for this multiple set of threaded connections (for example, the one calculated in 115) to perform torque-rotation angle method tightening on this set of threaded connections.

[0052] According to an embodiment of the present invention, the corrected mating torque is based on the self-locking torque of the self-locking nuts in this set of threaded connections (for example, the one obtained in 105) and the average mating torque difference for this multiple set of threaded connections (for example, the one obtained in 110).

[0053] Specifically, for each set of threaded connections among multiple sets of threaded connections, stage 120 may further include the following processes.

[0054] (1) Before installation, clean the bolts and self-locking nuts in this set of threaded connections with acetone to remove all traces of oil stains, residues, etc., and clean and dry them.

[0055] (2) Install the bolts in this set of threaded connections on a special fixture, and apply grease to the surface of the first three turns of the threads of the bolts by hand brushing.

[0056] (3) Use a special tooling to bring the self-locking nut in this set of threaded connections onto the bolt and tighten 2 - 3 threads.

[0057] (4) Use an electric tightening tool to tighten the nut to 30% of the maximum tightening torque of the bolt of this specification.

[0058] (5) Loosen the self-locking nut one turn, and then tighten the self-locking nut half a turn, record the self-locking torque T 1-i , and determine whether the self-locking torque T 1-i is within the qualified range. If it is unqualified, replace the self-locking nut.

[0059] (6) Use an electric tightening tool to tighten the self-locking nut to the corrected mating torque, and the corrected mating torque is the sum of the self-locking torque T 1-i of the self-locking nut and the difference T Δ平均 in the average mating torque, that is, T 1-i + T Δ平均 .

[0060] (7) Zero the angle of the electric tightening tool, set the tightening rotation angle to the calculated tightening rotation angle α A of the torque-rotation angle method, and use rotation angle control to tighten to reach the above rotation angle α A , and at the same time monitor the tightening torque to ensure that it does not exceed the maximum torque.

[0061] Generally speaking, stage 120 proposes a tightening process of the torque-rotation angle method for threaded connections with self-locking torque adaptation. According to the self-locking torque T 1-i obtained in 105 plus the difference T Δ平均 in the average mating torque determined in 110, the corrected mating torque is obtained. Thus, according to the tightening rotation angle α A proposed in 115, first reach the corrected mating torque through torque control, and then reach the required pre-tightening force through rotation angle control.

[0062] Figure 4FIG. 0 shows a schematic diagram of a torque-rotation method tightening system 400 based on self-locking torque correction according to one or more embodiments of the present invention. As shown, the system 400 mainly includes a self-locking torque acquisition module 405, an average mating torque difference calculation module 410, a tightening rotation angle calculation module 415, and a torque-rotation method tightening execution module 420.

[0063] Those skilled in the art can fully understand that the above module division is only for the purpose of clear explanation. The functions of one or more of the above modules can be combined into a single module or split into more modules / sub-modules. And, one or more of the above modules can be implemented in the form of software, hardware, or a combination thereof. In addition, the data transmission method between the modules can adopt the methods known in the art, which is not within the discussion scope of the present invention.

[0064] According to an embodiment of the present invention, the self-locking torque acquisition module 405 can be configured to obtain the self-locking torque of the self-locking nut in each set of threaded connections for multiple sets of threaded connections. For example, the self-locking torque acquisition module 405 can be configured to execute 105 in the above Figure 1 method 100.

[0065] According to an embodiment of the present invention, the average mating torque difference calculation module 410 can be configured to obtain the mating torque of the self-locking nut in each set of threaded connections for multiple sets of threaded connections, and calculate the average mating torque difference for multiple sets of threaded connections at least partially based on the difference between the mating torque of the self-locking nut in each set of threaded connections and the self-locking torque of the self-locking nut in this set of threaded connections. For example, the average mating torque difference calculation module 410 can be configured to execute 110 in the above Figure 1 method 100.

[0066] According to an embodiment of the present invention, the tightening rotation angle calculation module 415 can be configured to calculate the tightening rotation angle for multiple sets of threaded connections at least partially based on the maximum mating pre-tightening force and the minimum mating pre-tightening force of the multiple sets of threaded connections. For example, the tightening rotation angle calculation module 415 can be configured to execute 115 in the above Figure 1 method 100.

[0067] According to an embodiment of the present invention, the torque-rotation method tightening execution module 420 can be configured to perform torque-rotation method tightening on each set of threaded connections for multiple sets of threaded connections at least partially using the corrected mating torque of the self-locking nut in this set of threaded connections and the tightening rotation angle for multiple sets of threaded connections. For example, the torque-rotation method tightening execution module 420 can be configured to execute 120 in the above Figure 1 method 100.

[0068] In summary, the present invention determines the self-locking torque value of the nut through three tightenings and two loosenings; by analyzing and processing the tightening torque curve of the bolt, the statistical analysis method is used to determine the contact torque value of the bolt under different self-locking torques, realizing the adaptive control process; according to the distribution of the final pre-tightening force, the optimal contact torque and rotation angle parameters are determined, so as to determine the optimal tightening process of the torque-rotation angle method, enabling the pre-tightening force of the superalloy bolt to be accurately controlled and the tightening accuracy to be greatly improved, thus improving the reliability of the bolt connection of the aero-engine rotor system.

[0069] Therefore, the present invention proposes a self-locking torque testing and calculation method, constructs a refined self-locking nut tightening process, and has at least the following advantages: before tightening, the nut self-locking torque of the standard bolt is detected and screened, the thread is lubricated during the pre-tightening process, after the measured self-locking torque, by analyzing and processing the tightening torque curve of the bolt, the statistical analysis method is used to determine the contact torque value of the bolt under different self-locking torques, realizing the adaptive control process, and a technical method for determining the torque increment is proposed.

[0070] Figure 5 FIG. 500 is a block diagram of an exemplary computing device according to an embodiment of the present invention. The computing device is an example of a hardware device applicable to various aspects of the present invention. Refer to Figure 5, a computing device 500 will now be described. The computing device is an example of a hardware device applicable to various aspects of the present invention. The computing device 500 can be any machine configured to perform processing and / or computing, and can be, but is not limited to, a workstation, a server, a desktop computer, a laptop computer, a tablet computer, a personal digital assistant, a smartphone, an in-vehicle computer, or any combination thereof. The computing device 500 may include components connected or communicable via one or more interfaces and a bus 502. For example, the computing device 500 may include a bus 502, one or more processors 504, one or more input devices 506, and one or more output devices 508. The one or more processors 504 can be any type of processor and may include, but are not limited to, one or more general-purpose processors and / or one or more dedicated processors (e.g., specialized processing chips). The input device 506 can be any type of device capable of inputting information into the computing device and may include, but are not limited to, a mouse, a keyboard, a touch screen, a microphone, and / or a remote controller. The output device 508 can be any type of device capable of presenting information and may include, but are not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The computing device 500 may also include a non-transitory storage device 510 or be connected to the non-transitory storage device. The non-transitory storage device can be any storage device that is non-transitory and capable of implementing data storage, and the non-transitory storage device may include, but are not limited to, a disk drive, an optical storage device, a solid-state memory, a floppy disk, a flexible disk, a hard disk, a magnetic tape, or any other magnetic medium, an optical disk, or any other optical medium, a ROM (read-only memory), a RAM (random access memory), a cache memory, and / or any storage chip or cartridge, and / or any other medium from which a computer can read data, instructions, and / or code. The non-transitory storage device 510 can be separated from the interface. The non-transitory storage device 510 may have data / instructions / code for implementing the above methods and steps. The computing device 500 may also include a communication device 512. The communication device 512 can be any type of device or system capable of implementing communication with internal devices and / or communication with a network and may include, but are not limited to, a modem, a network card, an infrared communication device, a wireless communication device, and / or a chipset, such as a Bluetooth device, an IEEE 1302.11 device, a WiFi device, a WiMax device, a cellular communication device, and / or similar devices.

[0071] The bus 502 may include, but is not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, an Enhanced ISA (EISA) bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0072] The computing device 500 may also include a working memory 514, which can be any type of working memory capable of storing instructions and / or data that facilitate the operation of the processor 504 and may include, but is not limited to, random access memory and / or read-only storage devices.

[0073] Software components may be located in the working memory 514, and these software components include, but are not limited to, an operating system 516, one or more application programs 518, drivers, and / or other data and code. Instructions for implementing the above methods and steps of the present invention may be included in the one or more application programs 518, and the above method 100 of the present invention may be implemented by reading and executing the instructions of the one or more application programs 518 by the processor 504.

[0074] It should also be recognized that changes can be made according to specific requirements. For example, custom hardware can also be used, and / or specific components can be implemented in hardware, software, firmware, middleware, microcode, hardware description language, or any combination thereof. In addition, connections with other computing devices, such as network input / output devices, etc., can be adopted. For example, parts or all of the disclosed methods and devices can be implemented by using programmable logic circuits (such as field programmable gate arrays (FPGAs) and / or programmable logic arrays (PLAs)) with programming hardware having an assembly language or a hardware programming language (such as VERILOG, VHDL, C++) and utilizing the logic and algorithms according to the present invention.

[0075] Although aspects of the present invention have been described with reference to the accompanying drawings so far, the above methods and devices are only examples, and the scope of the present invention is not limited to these aspects, but is defined only by the appended claims and their equivalents. Various components may be omitted or may be replaced by equivalent components. In addition, the steps may be implemented in an order different from the order described in the present invention. Moreover, various components can be combined in various ways. It is also important that, as technology develops, many of the components described may be replaced by equivalent components that emerge later.

Claims

1. A tightening method of torque - rotation angle method for threaded connections based on self - locking torque correction, comprising: (1) For each group of threaded connections among multiple groups of threaded connections, obtain the self - locking torque of the self - locking nut in this group of threaded connections; (2) For each group of threaded connections among the multiple groups of threaded connections, obtain the mating torque of the self - locking nut in this group of threaded connections, and calculate the average mating torque difference for the multiple groups of threaded connections at least partially based on the difference between the mating torque of the self - locking nut in each group of threaded connections and the self - locking torque of the self - locking nut in this group of threaded connections; (3) Calculate the tightening rotation angle for the multiple groups of threaded connections at least partially based on the maximum mating pre - tightening force and the minimum mating pre - tightening force of the multiple groups of threaded connections; and (4) For each group of threaded connections among the multiple groups of threaded connections, tighten this group of threaded connections by the torque - rotation angle method at least partially using the corrected mating torque of the self - locking nut in this group of threaded connections and the tightening rotation angle, wherein the corrected mating torque is based on the self - locking torque of the self - locking nut in this group of threaded connections and the average mating torque difference for the multiple groups of threaded connections.

2. The method according to claim 1, wherein, step (1) further comprises: Install the self - locking nut in this group of threaded connections onto the bolt in this group of threaded connections, and tighten 2 - 3 threads; Tighten the self - locking nut to 30% of the maximum tightening torque of the bolt; and Loosen the self - locking nut one turn, and then tighten the self - locking nut half a turn again, and record the self - locking torque of the self - locking nut.

3. The method according to claim 1, wherein, step (2) further comprises: Tighten the self - locking nut in this group of threaded connections to 50% of the maximum tightening torque of the bolt in this group of threaded connections; and Record the torque curve of this group of threaded connections, thereby obtaining the mating torque of the self - locking nut in this group of threaded connections.

4. The method according to claim 3, wherein, Calculating the average mating torque difference for the multiple groups of threaded connections further comprises: For each group of threaded connections among the multiple groups of threaded connections, subtract the self - locking torque value of the self - locking nut from the mating torque of the self - locking nut in this group of threaded connections to obtain the difference torque of the self - locking nut; and Average the difference torques of the self - locking nuts in each group of threaded connections among the multiple groups of threaded connections, and use the obtained average difference torque as the average mating torque difference for the multiple groups of threaded connections.

5. The method according to claim 1, wherein, step (3) further comprises: Tighten the self - locking nut in this group of threaded connections to 70% of the maximum tightening torque of the bolt in this group of threaded connections.

6. The method according to claim 1, wherein, The corrected mating torque is the sum of the self - locking torque of the self - locking nut and the average mating torque difference.

7. A tightening system of torque - rotation angle method for threaded connections based on self - locking torque correction, comprising: Self-locking torque acquisition module, the self-locking torque acquisition module is configured to: for each set of threaded connections in multiple sets of threaded connections, acquire the self-locking torque of the self-locking nut in this set of threaded connections; Average fitting torque difference calculation module, the average fitting torque difference calculation module is configured to: for each set of threaded connections in the multiple sets of threaded connections, acquire the fitting torque of the self-locking nut in this set of threaded connections, and calculate the average fitting torque difference for the multiple sets of threaded connections at least partially based on the difference between the fitting torque of the self-locking nut in each set of threaded connections and the self-locking torque of the self-locking nut in this set of threaded connections; Tightening rotation angle calculation module, the tightening rotation angle calculation module is configured to: calculate the tightening rotation angle for the multiple sets of threaded connections at least partially based on the maximum fitting pre-tightening force and the minimum fitting pre-tightening force of the multiple sets of threaded connections; And Torque-angle method tightening execution module, the torque-angle method tightening execution module is configured to: for each set of threaded connections in the multiple sets of threaded connections, perform torque-angle method tightening on this set of threaded connections at least partially using the corrected fitting torque of the self-locking nut in this set of threaded connections and the tightening rotation angle, wherein the corrected fitting torque is based on the self-locking torque of the self-locking nut in this set of threaded connections and the average fitting torque difference for the multiple sets of threaded connections.

8. The system according to claim 7, wherein, Calculating the average fitting torque difference for the multiple sets of threaded connections further includes: For each set of threaded connections in the multiple sets of threaded connections, subtracting the self-locking torque value of the self-locking nut in this set of threaded connections from the fitting torque of the self-locking nut in this set of threaded connections to obtain the difference torque of the self-locking nut; and Averaging the difference torques of the self-locking nuts in each set of threaded connections in the multiple sets of threaded connections, and taking the obtained average difference torque as the average fitting torque difference for the multiple sets of threaded connections.

9. The system according to claim 7, wherein, The corrected fitting torque is the sum of the self-locking torque of the self-locking nut and the average fitting torque difference.

10. A computing device for torque-angle method tightening of threaded connections based on self-locking torque correction, comprising: A processor; A memory, the memory stores instructions, and the instructions can execute the method according to any one of claims 1-6 when executed by the processor.

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