Thread design method and device based on load distribution factor under axial load

Abstract

The invention provides a thread design method and device based on a load distribution factor under an axial load, and relates to the field of thread stress calculation. The method comprises the following steps: calculating axial load coefficients of different positions of a bolt meshing thread area, and correcting the axial load coefficient of each position; calculating the axial load of the bolt meshing thread area at the corresponding position by using the corrected axial load coefficient of each position; calculating a load distribution factor of the corresponding position based on the axial load of each position and the axial load coefficient of the corresponding position; and according to the load distribution factor of each position, generating a design scheme of a bolt meshing thread. According to the method, the distribution condition of the axial load in the thread meshing area can be evaluated more accurately, and optimization of thread design and nut selection is facilitated, so that the bolt connection strength is improved.

Description

Technical Field

[0001] The present application relates to the field of thread force calculation, and in particular to a thread design method and device based on a load distribution factor under axial load. Background Art

[0002] In the field of engineering, bolts are a common fastener used to connect two or more components. The performance and reliability of bolts depend largely on the load distribution in the threaded area. Under axial load, the load distribution in the threaded area of ​​the bolt is a complex issue involving multiple fields such as material mechanics, contact mechanics and tribology.

[0003] The traditional method for calculating the load distribution in the bolt meshing thread area is mainly based on empirical formulas and simplified mechanical models. However, the inventors found that although the above methods can predict the load distribution to a certain extent, they often ignore the influence of factors such as the plastic deformation of the thread teeth in the meshing thread area and the contact surface state on the load distribution, resulting in inaccurate load distribution prediction. If the bolt meshing thread is designed using inaccurate load distribution, the connection strength of the bolt will be reduced. Therefore, these methods have certain limitations in terms of accuracy and applicability. Summary of the invention

[0004] The present application provides a thread design method and device based on a load distribution factor under an axial load, so as to solve the problem in the prior art that the strength of bolt connection is reduced due to inaccurate load distribution factor.

[0005] In a first aspect, the present application provides a thread design method based on a load distribution factor under an axial load, comprising:

[0006] Calculate the axial load factor at different positions of the bolt thread engagement area and correct the axial load factor at each position;

[0007] Calculate the axial load of the bolt meshing thread zone at the corresponding position by using the corrected axial load coefficient at each position;

[0008] Based on the axial load at each position and the axial load factor at the corresponding position, calculate the load distribution factor at the corresponding position;

[0009] A design scheme for the bolt engagement thread is generated based on the load distribution factor at each position.

[0010] In a second aspect, the present application provides a thread design device based on a load distribution factor under an axial load, comprising:

[0011] The load factor correction module is used to calculate the axial load factor at different positions of the bolt meshing thread area and correct the axial load factor at each position;

[0012] An axial load calculation module, used to calculate the axial load of the bolt meshing thread area at the corresponding position using the corrected axial load coefficient of each position;

[0013] A distribution factor calculation module, used for calculating the load distribution factor of the corresponding position based on the axial load at each position and the axial load coefficient at the corresponding position;

[0014] The design scheme generating module is used to generate a design scheme for the bolt meshing thread according to the load distribution factor at each position.

[0015] The present application provides a thread design method and device based on the load distribution factor under axial load, by calculating the axial load coefficients at different positions of the bolt meshing thread area, and correcting the axial load coefficient at each position; using the corrected axial load coefficient at each position, calculating the axial load at the corresponding position of the bolt meshing thread area; based on the axial load at each position and the axial load coefficient at the corresponding position, calculating the load distribution factor at the corresponding position; according to the load distribution factor at each position, generating a design scheme for the bolt meshing thread. The present application fully considers the plastic deformation and contact surface state of the thread teeth in the meshing thread area, and the calculated load distribution factor is more accurate and more in line with the actual situation, and can more accurately evaluate the distribution of the axial load in the thread meshing area, which is helpful to optimize the thread design and nut selection, thereby improving the strength of the bolt connection; it can also optimize the thread design through the load distribution factor to make the bolt load evenly distributed and reduce the fatigue damage of the thread; and it can also predict the failure mode of the bolt under different working conditions by calculating the load distribution factor, which is of great significance for improving the reliability of the bolt connection and optimizing the structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 is a flow chart for implementing a thread design method based on a load distribution factor under an axial load provided in an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the axial force in the meshing thread area provided in an embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of a thread design device based on a load distribution factor under axial load provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0022] Figure 1 The implementation flow chart of the thread design method based on the load distribution factor under axial load provided in the embodiment of the present application is described in detail as follows:

[0023] In step 101, the axial load coefficients at different positions of the bolt meshing thread zone are calculated, and the axial load coefficient at each position is corrected.

[0024] In the embodiment of the present application, the Yamamoto equation is used to calculate the load coefficients at different positions in the bolt meshing thread area, and then the load coefficients at each position are corrected respectively, and the corrected load coefficients are used for subsequent calculations.

[0025] Among them, refer to Figure 2 The figure is a schematic diagram of the axial force in the meshing thread area of ​​this embodiment. The Yamamoto equation is an equation derived based on elastic theory and is used to show the decrease of the axial load in the meshing thread area. The axial load coefficient can be given by the Yamamoto equation, which is:

[0026]

[0027] Where, η is the axial load factor at the bolt position x, F is the axial load at the bolt position x, and F b is the axial force on the bolt connection, λ is the load characteristic parameter of the thread, x is the distance from the top surface of the nut, H is the thickness of the nut, and A b is the effective cross-sectional area of ​​the screw, E b is the elastic modulus of the screw, A n is the effective cross-sectional area of ​​the nut, E n is the elastic modulus of the nut, k b is the elastic deformation coefficient of the screw, k n is the elastic deformation coefficient of the nut, and β is the thread lead angle.

[0028] Since the traditional calculation method of load distribution in the bolt meshing thread area often ignores the influence of factors such as the plastic deformation of the thread teeth in the meshing thread area and the contact surface state on the load distribution, and in order to study the effect of axial load on the stress characteristics of the bolt connection meshing thread area, this embodiment also analyzes and proposes a correction formula for load transmission in the bolt connection meshing thread area, providing a scientific basis for actual engineering.

[0029] In a possible implementation, modifying the axial load factor at each position may include:

[0030] Finite element analysis is used to correct the axial load factor at each position.

[0031] Among them, Finite Element Analysis (FEA) uses mathematical approximation methods to simulate real physical systems (geometry and load conditions). By using simple and interacting elements (i.e. units), a finite number of unknown quantities can be used to approximate a real system with infinite unknown quantities.

[0032] Optionally, first use finite element analysis to establish a refined finite element model of the bolt corresponding to the bolt connection structure, and then based on the axial load coefficient at each position calculated using the Yamamoto equation, the axial load values ​​of each section in the meshing thread area in the refined finite element model of the bolt are used to study the load distribution change law in the thread engagement area under different loads, thereby realizing the correction of the axial load coefficient.

[0033] The calculation formula for the corrected axial load factor is:

[0034]

[0035] Among them, η x is the corrected axial load coefficient, x is the distance from the top surface of the nut, H is the thickness of the nut, P is the thread pitch, and a1, b1, c1, d1 and e1 are all parameters obtained through finite element analysis. The specific references to the distance x from the top surface of the nut and the thickness H of the nut can be found in Figure 2 .

[0036] For example, the parameters of the M24 bolt obtained through finite element analysis may be: a1=0.3594, b1=-0.1815, c1=-0.0257, d1=-0.0121, e1=0.0014.

[0037] For the bolt refined finite element model, since the bolt connection structure includes a screw, a nut, and a connecting plate, the bolt refined finite element model includes three-dimensional solid elements of each component, the real material properties of the screw and the nut, the connecting plate with rigid material properties, and the threaded structure of the screw and the nut.

[0038] The upper and lower rigid plates and high-strength bolts in the refined finite element model of the bolt are modeled using SOLID185 units. Contact pairs consisting of contact units CONTACT174 and target units TRAGET170 are set between the upper and lower rigid plates, between the upper rigid plate and the bolt head, between the hole walls of the upper and lower rigid plates and the screw, and between the meshing areas of the screw external thread and the nut internal thread.

[0039] In the bolt refined finite element model, the axial load of the screw is applied by setting the interference contact between the contact surfaces of the upper and lower rigid plates.

[0040] In step 102, the axial load of the bolt meshing thread area at the corresponding position is calculated using the corrected axial load coefficient at each position.

[0041] In the embodiment of the present application, the axial load coefficient of each position calculated and corrected in step 101 is used to calculate the axial load at the corresponding position of the bolt meshing threaded area.

[0042] In a possible implementation, using the corrected axial load coefficient at each position, calculating the axial load at the corresponding position of the bolt meshing thread zone may include:

[0043] Input the corrected axial load coefficient at each position into the axial load formula to obtain the axial load at the corresponding position of the bolt meshing thread area. The axial load formula is:

[0044] F=F b ·η x

[0045] Where F is the axial load at the bolt position x, F b is the axial force borne by the bolt connection, η x is the corrected axial load factor.

[0046] Optionally, the corrected axial load coefficients at different positions and the axial force borne by the bolt connection are input into the axial load formula F = F b ·η x , and the axial load at different positions of the bolt meshing thread area is obtained.

[0047] In step 103, based on the axial load at each position and the axial load coefficient at the corresponding position, the load distribution factor at the corresponding position is calculated.

[0048] In the embodiment of the present application, the load distribution factor of the corresponding position is calculated by using the axial load of each position calculated in step 102 and the axial load coefficient of the corresponding position calculated in step 101.

[0049] In a possible implementation, before calculating the load distribution factor of the corresponding position based on the axial load at each position and the axial load coefficient of the corresponding position, the method may further include:

[0050] The axial force formula on the micro-segment of the screw thread is established using the plane beam theory. The axial force formula on the micro-segment of the screw thread is:

[0051] wcosα·dx·cotβ=dF

[0052] Where w is the force per unit width, α is the half angle of the thread, β is the lead angle of the thread, and F is the axial load at the bolt position x;

[0053] Accordingly, based on the axial load at each position and the axial load factor at the corresponding position, the load distribution factor at the corresponding position is calculated, including:

[0054] Based on the axial load at each position, the axial load coefficient at the corresponding position and the axial force formula on the thread micro-segment, the load distribution factor at the corresponding position is calculated.

[0055] Optionally, before calculating the load distribution factor at each position, this embodiment needs to establish an axial force formula on the thread micro-segment using plane theory, in order to calculate the load distribution factor using the axial force formula.

[0056] The formula for the axial force on the micro-segment of the screw thread is:

[0057] wcosα·dx·cotβ=dF

[0058] Where w is the force per unit width, α is the half angle of the thread, β is the lead angle of the thread, and F is the axial load at the bolt position x. Figure 2 .

[0059] Accordingly, the load distribution factor at the corresponding position is calculated based on the axial load at each position, the axial load at the corresponding position and the axial force formula on the thread micro-segment.

[0060] In a possible implementation, based on the axial load at each position, the axial load coefficient at the corresponding position and the axial force formula on the thread micro-segment, the load distribution factor at the corresponding position is calculated, which may include:

[0061] Get the average axial force per unit circumferential length of the bolt;

[0062] The axial load at each position and the axial load coefficient at the corresponding position are respectively input into the axial force formula on the thread micro-segment to obtain the target component force at the corresponding position;

[0063] For each location, the load distribution factor at that location is calculated using the average axial force per unit circumferential length of the bolt and the target force component at that location.

[0064] In this embodiment, the load distribution factor of the bolt meshing thread area is composed of the target component force wcosα and the average axial force per unit circumference length F b / (πd p H / P) ratio definition.

[0065] Optionally, for each position, the axial load and axial load coefficient of the position are input into the axial force formula on the thread micro-segment, and the first-order derivative of the formula is solved to obtain the target component force at the corresponding position.

[0066] Among them, the target force component at each position is expressed by the first formula, which is:

[0067]

[0068] Where η is the axial load factor.

[0069] Then obtain the average axial force F per unit circumferential length of the bolt b / (πd p H / P).

[0070] Finally, for each position, the target component force at the position and the average axial force per unit circumferential length of the bolt are input into the second formula to calculate the load distribution factor at the position.

[0071] Among them, the second formula is:

[0072]

[0073] Where R(x) is the load distribution factor at bolt position x, d p is the effective thread diameter.

[0074] In step 104, a design scheme for the bolt engagement thread is generated according to the load distribution factor at each position.

[0075] In the embodiment of the present application, the load distribution factor of each position in the bolt meshing thread area calculated in step 103 is used to generate a corresponding bolt meshing thread design scheme, which can more realistically describe the load distribution of the bolt meshing thread area in the actual situation. The design scheme may include but is not limited to the stress distribution of the threaded area and the maximum stress tolerance.

[0076] The present application provides a thread design method based on load distribution factor under axial load, by calculating the axial load coefficients at different positions of the bolt meshing thread area, and correcting the axial load coefficient at each position; using the corrected axial load coefficient at each position, calculating the axial load at the corresponding position of the bolt meshing thread area; based on the axial load at each position and the axial load coefficient at the corresponding position, calculating the load distribution factor at the corresponding position; according to the load distribution factor at each position, generating a design scheme for the bolt meshing thread. The present application fully considers the plastic deformation and contact surface state of the thread teeth in the meshing thread area, and the calculated load distribution factor is more accurate and more in line with the actual situation, and can more accurately evaluate the distribution of axial load in the thread meshing area, which is helpful to optimize the thread design and nut selection, thereby improving the strength of the bolt connection; it can also optimize the thread design through the load distribution factor to make the bolt load evenly distributed and reduce the fatigue damage of the thread; and it can also predict the failure mode of the bolt under different working conditions by calculating the load distribution factor, which is of great significance for improving the reliability of the bolt connection and optimizing the structural design.

[0077] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean 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 application.

[0078] The following is an embodiment of the device of the present application. For details not described in detail, please refer to the corresponding method embodiment described above.

[0079] Figure 3 The structural schematic diagram of the thread design device based on the load distribution factor under axial load provided by the embodiment of the present application is shown. For the convenience of explanation, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0080] like Figure 3 As shown, the thread design device 3 based on the load distribution factor under axial load includes:

[0081] The load coefficient correction module 31 is used to calculate the axial load coefficients at different positions of the bolt meshing thread area and correct the axial load coefficient at each position;

[0082] An axial load calculation module 32 is used to calculate the axial load of the bolt meshing thread area at the corresponding position using the corrected axial load coefficient at each position;

[0083] A distribution factor calculation module 33, used to calculate the load distribution factor of the corresponding position based on the axial load at each position and the axial load coefficient of the corresponding position;

[0084] The design solution generating module 34 is used to generate a design solution for the bolt engagement thread according to the load distribution factor at each position.

[0085] The present application provides a thread design device based on the load distribution factor under axial load, by calculating the axial load coefficients at different positions of the bolt meshing thread area, and correcting the axial load coefficient at each position; using the corrected axial load coefficient at each position, calculating the axial load at the corresponding position of the bolt meshing thread area; based on the axial load at each position and the axial load coefficient at the corresponding position, calculating the load distribution factor at the corresponding position; according to the load distribution factor at each position, generating a design scheme for the bolt meshing thread. The present application fully considers the plastic deformation and contact surface state of the thread teeth in the meshing thread area, and the calculated load distribution factor is more accurate and more in line with the actual situation, and can more accurately evaluate the distribution of the axial load in the thread meshing area, which is helpful to optimize the thread design and nut selection, thereby improving the strength of the bolt connection; it can also optimize the thread design through the load distribution factor to make the bolt load evenly distributed and reduce the fatigue damage of the thread; and it can also predict the failure mode of the bolt under different working conditions by calculating the load distribution factor, which is of great significance for improving the reliability of the bolt connection and optimizing the structural design.

[0086] In a possible implementation, the load factor correction module can be used to:

[0087] The Yamamoto equation is used to calculate the axial load coefficient at different positions in the bolt meshing thread area. The Yamamoto equation is:

[0088]

[0089] Where, η is the axial load factor at the bolt position x, F is the axial load at the bolt position x, and F b is the axial force on the bolt connection, λ is the load characteristic parameter of the thread, x is the distance from the top surface of the nut, H is the thickness of the nut, and A b is the effective cross-sectional area of ​​the screw, E b is the elastic modulus of the screw, A n is the effective cross-sectional area of ​​the nut, E n is the elastic modulus of the nut, k b is the elastic deformation coefficient of the screw, k n is the elastic deformation coefficient of the nut, and β is the thread lead angle.

[0090] In a possible implementation, the load factor correction module may also be used to:

[0091] Finite element analysis is used to correct the axial load factor at each position.

[0092] In one possible implementation, the calculation formula for the modified axial load factor is:

[0093]

[0094] Among them, η x is the corrected axial load coefficient, x is the distance from the top surface of the nut, H is the thickness of the nut, P is the thread pitch, and a1, b1, c1, d1 and e1 are parameters obtained through finite element analysis.

[0095] In one possible implementation, the axial load calculation module can be used to:

[0096] Input the corrected axial load coefficient at each position into the axial load formula to obtain the axial load at the corresponding position of the bolt meshing thread area. The axial load formula is:

[0097] F=F b ·η x

[0098] Where F is the axial load at the bolt position x, F b is the axial force borne by the bolt connection, η x is the corrected axial load factor.

[0099] In a possible implementation, the device may further include an axial force calculation module, which may be used to:

[0100] The axial force formula on the micro-segment of the screw thread is established using the plane beam theory. The axial force formula on the micro-segment of the screw thread is:

[0101] wcosα·dx·cotβ=dF

[0102] Where w is the force per unit width, α is the half angle of the thread, β is the lead angle of the thread, and F is the axial load at the bolt position x;

[0103] Accordingly, the distribution factor calculation module can be used for:

[0104] Based on the axial load at each position, the axial load coefficient at the corresponding position and the axial force formula on the thread micro-segment, the load distribution factor at the corresponding position is calculated.

[0105] In a possible implementation, the distribution factor calculation module may be specifically used for:

[0106] Get the average axial force per unit circumferential length of the bolt;

[0107] The axial load at each position and the axial load coefficient at the corresponding position are respectively input into the axial force formula on the thread micro-segment to obtain the target component force at the corresponding position;

[0108] For each location, the load distribution factor at that location is calculated using the average axial force per unit circumferential length of the bolt and the target force component at that location.

[0109] In a possible implementation, the distribution factor calculation module may also be used to:

[0110] The target force component at each position is calculated by the first formula, which is:

[0111]

[0112] Where η is the axial load factor.

[0113] In a possible implementation, the distribution factor calculation module may also be used to:

[0114] The load distribution factor at each location is calculated using the second formula, which is:

[0115]

[0116] Where R(x) is the load distribution factor at bolt position x, d p is the effective thread diameter.

[0117] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0118] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0119] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned thread design method embodiments based on the load distribution factor under axial load. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0120] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A thread design method based on load distribution factor under axial load, characterized in that: include: Calculate the axial load factor at different positions of the bolt thread engagement area and correct the axial load factor at each position; Calculate the axial load of the bolt meshing thread zone at the corresponding position by using the corrected axial load coefficient at each position; Based on the axial load at each position and the axial load factor at the corresponding position, calculate the load distribution factor at the corresponding position; A design scheme for the bolt engagement thread is generated based on the load distribution factor at each position.

2. The thread design method based on load distribution factor under axial load according to claim 1 is characterized in that: The calculation of the axial load coefficient at different positions of the bolt engagement thread zone includes: The Yamamoto equation is used to calculate the axial load coefficient at different positions of the bolt meshing thread area. The Yamamoto equation is: Where, η is the axial load factor at the bolt position x, F is the axial load at the bolt position x, and F b is the axial force on the bolt connection, λ is the load characteristic parameter of the thread, x is the distance from the top surface of the nut, H is the thickness of the nut, and A b is the effective cross-sectional area of ​​the screw, E b is the elastic modulus of the screw, A n is the effective cross-sectional area of ​​the nut, E n is the elastic modulus of the nut, k b is the elastic deformation coefficient of the screw, k n is the elastic deformation coefficient of the nut, and β is the thread lead angle.

3. The thread design method based on load distribution factor under axial load according to claim 1, characterized in that: The correction of the axial load factor at each position includes: Finite element analysis is used to correct the axial load factor at each position.

4. The thread design method based on load distribution factor under axial load according to claim 3 is characterized in that: The calculation formula for the corrected axial load factor is: Among them, η x is the corrected axial load coefficient, x is the distance from the top surface of the nut, H is the thickness of the nut, P is the thread pitch, and a1, b1, c1, d1 and e1 are parameters obtained through finite element analysis.

5. The thread design method based on load distribution factor under axial load according to claim 1, characterized in that: The method of calculating the axial load of the bolt meshing thread zone at the corresponding position by using the corrected axial load coefficient at each position includes: The corrected axial load coefficient at each position is input into the axial load formula to obtain the axial load at the corresponding position of the bolt meshing thread area. The axial load formula is: F=F b ·or x Where F is the axial load at the bolt position x, F b is the axial force borne by the bolt connection, η x is the corrected axial load factor.

6. The thread design method based on load distribution factor under axial load according to claim 1, characterized in that: Before calculating the load distribution factor of the corresponding position based on the axial load at each position and the axial load coefficient of the corresponding position, the method further includes: The plane beam theory is used to establish the axial force formula on the screw thread micro-segment, and the axial force formula on the screw thread micro-segment is: wcosα·dx·costβ=dF Where w is the force per unit width, α is the half angle of the thread, β is the lead angle of the thread, and F is the axial load at the bolt position x; Accordingly, the load distribution factor at the corresponding position is calculated based on the axial load at each position and the axial load coefficient at the corresponding position, including: Based on the axial load at each position, the axial load coefficient at the corresponding position and the axial force formula on the thread micro-segment, the load distribution factor at the corresponding position is calculated.

7. The thread design method based on load distribution factor under axial load according to claim 6, characterized in that: The calculation of the load distribution factor at the corresponding position based on the axial load at each position, the axial load coefficient at the corresponding position and the axial force formula on the thread micro-segment includes: Get the average axial force per unit circumferential length of the bolt; The axial load at each position and the axial load coefficient at the corresponding position are respectively input into the axial force formula on the thread micro-segment to obtain the target component force at the corresponding position; For each position, the load distribution factor of the position is calculated using the average axial force per unit circumferential length of the bolt and the target component force at the position.

8. The thread design method based on load distribution factor under axial load according to claim 7, characterized in that: The axial load at each position and the axial load coefficient at the corresponding position are respectively input into the axial force formula on the thread micro-segment to obtain the target component force at the corresponding position, including: The target force component at each position is calculated by the first formula, which is: Wherein, η is the axial load coefficient.

9. The thread design method based on load distribution factor under axial load according to claim 7, characterized in that: For each position, the load distribution factor of the position is calculated using the average axial force per unit circumferential length of the bolt and the target component force at the position, including: The load distribution factor at each location is calculated by the second formula, which is: Where R(x) is the load distribution factor at bolt position x, d p is the effective thread diameter.

10. A thread design device based on load distribution factor under axial load, characterized in that: include: The load factor correction module is used to calculate the axial load factor at different positions of the bolt meshing thread area and correct the axial load factor at each position; An axial load calculation module, used to calculate the axial load of the bolt meshing thread area at the corresponding position using the corrected axial load coefficient of each position; A distribution factor calculation module, used for calculating the load distribution factor of the corresponding position based on the axial load at each position and the axial load coefficient at the corresponding position; The design scheme generating module is used to generate a design scheme for the bolt meshing thread according to the load distribution factor at each position.

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