Simulation analysis method for technological parameters in forming process of anti-loose fuse

Abstract

The invention discloses an anti-loose fuse forming process technological parameter simulation analysis method. The method comprises the following steps that an initial fuse model, a bolt fixing point model and a rotation auxiliary model are assembled to obtain a double-helix fuse forming simulation model; the fuse forming process is decomposed into three analysis steps of folding, rotating and pulling; dividing grids for the initial fuse model, the bolt fixing point model and the rotation auxiliary model, and setting a load mode for the three analysis steps to perform simulation analysis; acquiring limit working loads corresponding to different process parameters according to a fuse failure mode criterion; and performing an orthogonal simulation test on each group of process parameters, and taking the group with the maximum limit working load as an optimal process parameter combination. By fully simulating the process characteristics of the fuse forming process, initial prestress and deformation are established for the loaded process, more accurate initial boundary conditions are provided, and the accuracy of the simulation result is improved.

Description

Technical Field

[0001] This invention belongs to the field of computer simulation technology, specifically relating to a simulation analysis method for process parameters of anti-loosening fuse forming process. Background Technology

[0002] In the field of aviation assembly, fuse anti-loosening methods are widely used in airborne finished product installation bolts and system pipeline connections. A single fuse passes through the bolt fixing point, is folded in half and then screwed into a spiral structure. After connecting two bolts, it can effectively prevent the joint from rotating and loosening, and has a good anti-loosening effect.

[0003] The two most important process parameters in fuse anti-loosening are the pitch of the double-helix fuse and the preload during fuse installation. Relevant standards provide a relatively broad range for pitch, but only offer a manual method for judging preload, lacking specific numerical requirements. When selecting process parameters, fuse performance needs to be calculated. Two common methods are: 1) Treating the fuse as an equivalent double-strand straight fuse. This method ignores the helical characteristics of the fuse, and the interlaced helices create shear forces, resulting in significant deviations in the calculated fuse structural strength. 2) Using a double-helix structure for tensile simulation. This method considers the influence of the fuse's structural characteristics on its mechanical properties but ignores the forming process. During forming, the fuse generates internal stress and plastic deformation, and these initial conditions have a significant impact on the operating conditions. Summary of the Invention

[0004] This invention addresses the lack of a clear analytical method for the process parameters of anti-loosening fuses, and the problem that conventional simulations of the mechanical properties of anti-loosening fuses neglect the plastic deformation and internal stress caused by the forming process of the double helix structure, leading to inaccurate simulation results and difficulty in selecting and optimizing process parameters. It provides a simulation analysis method for the process parameters of the anti-loosening fuse forming process to solve the aforementioned technical problems.

[0005] This invention is achieved through the following technical solution:

[0006] The simulation analysis method for process parameters of anti-loosening fuse forming process includes the following steps:

[0007] An initial fuse model, a bolt fixing point model, and a rotation auxiliary model are established. The initial fuse model, the bolt fixing point model, and the rotation auxiliary model are then assembled to obtain a simulation model of the double helix fuse forming.

[0008] The forming process of the anti-loosening fuse is decomposed into three analysis steps: folding, rotation, and tension. The interaction between the anti-loosening fuse, the bolt fixing point and the rotation auxiliary model and the effective conditions in each analysis step are set.

[0009] The initial fuse model, bolt fixing point model, and rotation auxiliary model were meshed, and the load modes were set for the three analysis steps for simulation analysis.

[0010] The reaction force at fixed points, the displacement of tensile nodes, and the stress at fuse structure nodes are obtained at set time intervals. Based on the fuse failure mode criteria, the ultimate working load corresponding to different process parameters is obtained.

[0011] Orthogonal simulation experiments were conducted on each group of process parameters, and the group with the largest ultimate working load was taken as the optimal combination of process parameters.

[0012] In some embodiments of the present invention, the interaction between the anti-loosening fuse, the bolt fixing point and the rotation auxiliary model includes the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse, and the coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model.

[0013] In some embodiments of the present invention, the contact is set as a general contact, and the contact properties include tangential behavior and normal behavior. The friction coefficient of the tangential behavior is based on the friction coefficient of the corresponding material, and the normal behavior is hard contact.

[0014] In some embodiments of the present invention, the interaction is effective in each analysis step under the following conditions: the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse is effective in all three analysis steps, and the coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model is effective in the rotation analysis step and the tension analysis step.

[0015] In some embodiments of the present invention, the step of meshing the initial fuse model, bolt fixing point model, and rotation auxiliary model includes:

[0016] More than 12 seed nodes are evenly distributed on the circumference of the end face of the fuse, and the mesh element is an eight-node linear hexahedral element; the mesh element type of the bolt fixing point model and the rotation auxiliary model is a discrete rigid body element with quadrilateral as the main type.

[0017] In some embodiments of the present invention, the step of setting the load mode for the three analysis steps includes:

[0018] In the folding analysis step, control points are set at the center of the two end faces of the fuse. The control points are rotated 90 degrees around the Z-axis and a preload force is applied in the positive direction of the Y-axis. After the simulation of this step is completed, the rotation auxiliary model moves in the negative direction of the Y-axis.

[0019] In the rotation analysis step, the rotation auxiliary model rotates about the Y-axis. The length of the anti-loosening fuse is L, the lead is P, and a preload force along the positive Y-axis is applied to the control point of the rotation auxiliary model. In the double-helix fuse forming simulation model, the fuse length direction is the X-axis, the perpendicular bisector of the fuse in the horizontal plane is the Y-axis, and the vertical direction is the Z-axis.

[0020] In the tensile analysis step, a load along the positive Y-axis is applied at the control point of the rotational auxiliary model. The initial load is the preload, and the final load is the breaking load.

[0021] In some embodiments of the present invention, the fuse failure modes include bolt loosening failure and fracture failure; the bolt loosening failure is when the elongation of the fuse reaches 20° of bolt rotation, and the fracture failure is when the maximum stress of the fuse exceeds the tensile strength of the fuse material.

[0022] In some embodiments of the present invention, the failure mode criterion of the fuse is to use the smaller of the maximum elongation working load and the breaking working load corresponding to each set of process parameters as the ultimate working load of that set of process parameters.

[0023] In some embodiments of the present invention, the preload and pitch of the anti-loosening fuse are divided into multiple levels and multiple sets of process parameters are formed, and orthogonal simulation tests are performed on each set of process parameters.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] This invention uses model simulation of the forming process of a double-helix fuse structure. Based on this, it simulates and analyzes the tensile deformation and stress of the fuse under different process parameters, and establishes a criterion for fuse failure modes, providing a basis for determining the forming process parameters of the fuse. By fully simulating the process characteristics of the fuse forming process, it establishes the initial prestress and deformation for the loaded process, providing more accurate initial boundary conditions, improving the accuracy of the simulation results, and obtaining the damage of different process parameters to the fuse during the forming process.

[0026] This invention obtains the corresponding process parameters through finite element simulation of the fuse forming and service process. The analysis and definition are clear, and the process steps are well defined, which effectively solves the problem of the lack of clear basis for the process parameters of anti-loosening fuses.

[0027] In establishing the fuse failure mode criterion, this invention fully considers the rotation range of bolt loosening and incorporates spatial parameters such as bolt diameter and relative bolt position into the calculation, overcoming the problem that traditional stress criteria are not applicable to the anti-loosening failure condition after excessive fuse deformation.

[0028] This invention fully simulates the dynamic process of fuse bending-rotation-tension forming. Compared with the traditional method of using a directly given double helix structure for static tensile strength simulation, it considers the stress and deformation during the forming process. It uses a rotational auxiliary model during the forming process to simplify the force and displacement constraints into rotational behavior, which reduces the difficulty of controlling the helical forming boundary and improves the convergence speed of the simulation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating the simulation analysis method for process parameters in the anti-loosening fuse forming process according to an embodiment of the present invention.

[0031] Figure 2 A schematic diagram of the initial fuse model, bolt fixing point model, and rotation auxiliary model established for embodiments of the present invention; wherein, Figure 2 (a) is a schematic diagram of the initial fuse model structure, where S is the required length of the straight fuse and D is the fuse diameter. Figure 2 (b) is a schematic diagram of the bolt fixing point model structure. Figure 2 (c) is a schematic diagram of the rotation-assisted model structure.

[0032] Figure 3 This is a schematic diagram of a typical anti-loosening fuse structure in an embodiment of the present invention.

[0033] Figure 4 This is a simulation model of the double-helix fuse assembly obtained in an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the fuse mesh division according to an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the loading model for each analysis step in an embodiment of the present invention; wherein, Figure 6 (a) is a schematic diagram of the simulation model corresponding to the folding analysis step. Figure 6 (b) is a schematic diagram of the simulation model corresponding to the rotation analysis step. Figure 6 (c) is a schematic diagram of the simulation model corresponding to the tensile analysis step.

[0036] Figure 7 This is a schematic diagram of the calculation model for the ultimate elongation of the anti-loosening fuse according to an embodiment of the present invention.

[0037] Figure 8This is an orthogonal test curve of the parameters corresponding to the preload of the anti-loosening fuse and the ultimate working load in an embodiment of the present invention.

[0038] Figure 9 This is an orthogonal test curve of the parameters corresponding to the anti-loosening fuse pitch and the ultimate working load in an embodiment of the present invention.

[0039] in:

[0040] 11. Anti-loosening fuse; 21. Bolt fixing point;

[0041] 21. Initial fuse model; 22. Bolt fixing point model; 23. Rotation auxiliary model. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0043] Traditional finite element simulations of anti-loosening fuses directly introduce the geometric model of the double helix structure as the simulation model. In reality, anti-loosening fuses are tightened by the operator from a single-strand fuse to a double-helix fuse, and have already undergone plastic deformation and internal stress before being loaded; however, the double helix structure introduced by the traditional method has zero stress and deformation at the initial stage of the simulation, resulting in a large simulation deviation.

[0044] This invention begins by establishing a geometric model of a single-strand fuse, then sets the material and meshes the fuse, pre-shapes the fuse, and uses an auxiliary rotational model to simulate the forming process, including rotation and stretching. This overcomes the complex boundary condition control during the forming process, resulting in a double-helix structure with stress and plastic deformation. Tensile loads are then applied to the double-helix fuse, and its mechanical properties are simulated. Finally, a deformation-stress binary criterion considering the bolt loosening process and relative position is proposed, providing a reference for selecting the preload and pitch process parameters for the fuse.

[0045] In some embodiments of the present invention, reference is made to Figure 1The simulation analysis method for the process parameters of anti-loosening fuse forming process includes the following steps:

[0046] S01, Geometric Modeling and Assembly

[0047] Establish the initial fuse model 21, bolt fixing point model 22, and rotation auxiliary model 23, as follows: Figure 2 As shown.

[0048] like Figure 3 A typical anti-loosening fuse structure consists of two parts: a bolt fixing point 21 and an anti-loosening fuse 11 with a double helix structure. When the bolt is loose, the anti-loosening fuse can provide tension to prevent the bolt from rotating and thus play an anti-loosening role. Due to the symmetry of the structure, in the simulation model, this scenario can be simplified to one end of the double helix fuse being under tension and the other end being connected to the model of the fixed structure.

[0049] The spiral forming process of the anti-loosening fuse involves passing a single straight fuse through the bolt fixing point, folding it in half, clamping the two open ends of the fuse, applying a certain preload, and rotating it to form the desired shape.

[0050] To simulate the above process, an initial linear fuse model needs to be established first. For a double-helix anti-loosening fuse with length L, helical lead P, and fuse diameter D, the required length S of the linear fuse is:

[0051]

[0052] The established linear fuse model is as follows Figure 2 As shown in (a); the bolt fixing point model is a hexagonal bolt with a fixing hole, such as Figure 2 As shown in (b); the rotational auxiliary model is an auxiliary model that simulates the clamping rotation and the application of preload, such as Figure 2 As shown in (c).

[0053] After modeling, the three parts are assembled into the initial state of a double-helix fuse. The initial fuse model is inserted into the bolt fixing point, with the midpoint of the fuse aligned with the bolt fixing point. The rotating auxiliary model is located on the perpendicular bisector of the fuse model, at a distance greater than S / 2 from the fuse model, resulting in a complete simulation 3D model as shown below. Figure 4 As shown in the figure, the X-axis is the length direction of the fuse, the Y-axis is the direction of the perpendicular bisector of the fuse in the horizontal plane, and the Z-axis is the vertical direction.

[0054] S2, Setting up materials, analyzing steps and interactions

[0055] The anti-loosening fuse undergoes elastoplastic deformation during its forming process. Density, Young's modulus, yield stress, and plastic strain parameters are defined based on material properties. The bolt fixing point model and auxiliary rotation model exhibit almost no deformation during fuse forming and can be simplified as rigid bodies in the simulation, requiring only the density parameter to be set.

[0056] Based on the forming process of the anti-loosening fuse, it is decomposed into three analysis steps: folding, rotation, and tension, all of which are explicit dynamic analysis modes.

[0057] The interaction between the anti-loosening fuse, the bolt fixing point, and the rotation auxiliary model is defined. The interaction includes the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse, and the coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model.

[0058] The contact between the anti-loosening fuse and the bolt fixing point, and the self-contact of the anti-loosening fuse are effective in all three analysis steps. The coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model is effective in the rotation and tension analysis steps.

[0059] The contact is set to general contact, and the contact properties include tangential and normal behavior. The friction coefficient for tangential behavior is based on the friction coefficient of the corresponding material, and the normal behavior is set to hard contact. The coupling type is set to motion, constraining all degrees of freedom.

[0060] S3, Mesh Generation and Loading

[0061] Fuse mesh division: such as Figure 5 More than 12 node seeds are evenly distributed on the circumference of the end face of the fuse. The global node seed size is 0.5mm. The element type is an eight-node linear hexahedral element. Reduced integral and hourglass control are enabled.

[0062] Mesh generation of the bolt fixing point model: global node seed size is 0.3mm, and the element type is discrete rigid body element with quadrilaterals as the main component.

[0063] Meshing of the rotation-assisted model: The global node seed size is 0.5mm, and the element type is mainly discrete rigid body element with quadrilaterals.

[0064] In the load settings, first set the control points of the bolt fixing point model as fixed constraints.

[0065] There are three load modes in the entire simulation process, which exist in the three analysis steps of folding, rotation, and tension.

[0066] Folding analysis steps: such as Figure 6 As shown in (a), control points are set at the center of the two end faces of the fuse. The control points are rotated 90 degrees around the Z-axis and a preload is applied in the positive Y-axis direction. After this simulation step is completed, the rotational auxiliary model moves in the negative Y-axis direction.

[0067] Rotational analysis step: such as Figure 6 As shown in (b), the coupling between the fuse end face and the rotary auxiliary model is effective, and the rotary auxiliary model rotates about the Y-axis. The length is L, the fuse length is P, and a preload force along the positive Y-axis is applied to the control points of the rotating auxiliary model.

[0068] Tension analysis step: such as Figure 6 As shown in (c), a load along the positive Y-axis is applied to the control point of the rotational auxiliary model. The initial load is the preload and the final load is the breaking load. The load changes linearly.

[0069] S4. Result Extraction and Parameter Analysis

[0070] There are two key process parameters in forming a double-helix anti-loosening fuse: the preload of the double-helix anti-loosening fuse and the pitch of the double-helix structure.

[0071] Anti-loosening fuses have two failure modes.

[0072] The first failure mode is when the bolts connected to it rotate 20°. After the bolts rotate 20°, they can be considered loose. At this point, the bolts are loose and the anti-loosening fuse no longer serves its anti-loosening function.

[0073] The criterion for this failure mode is the amount of fuse elongation caused by the bolt rotating 20°, at which point the corresponding working load is the maximum elongation working load.

[0074] like Figure 7 The specific calculation method for the elongation of the anti-loosening fuse is as follows:

[0075]

[0076] sinα=L*sinθ / d.

[0077] Where, Δ L L is the elongation of the anti-loosening fuse; d is the distance from the center of the anti-loosening fuse connecting bolt to the bolt fixing point; R is the radius of the anti-loosening fuse connecting bolt; α is the initial included angle of the anti-loosening fuse connecting bolt; θ is the lead-out angle of the anti-loosening fuse, that is, the included angle between the anti-loosening fuse and the tangent of the bolt.

[0078] The second failure mode is fracture failure, which occurs when the maximum stress of the fuse exceeds the tensile strength of the material. The corresponding working load at this time is the fracture working load.

[0079] The smaller of the maximum elongation working load and the breaking working load corresponding to each set of process parameters is taken as the ultimate working load of that set of process parameters.

[0080] The criterion for process parameters is the magnitude of the ultimate working load; the larger the ultimate working load, the better the process parameters.

[0081] After the finite element model calculations for the corresponding process parameters are completed, the reaction force at the fixed point, the displacement of the tensile node, and the stress at the node of the fuse structure are extracted at certain time intervals.

[0082] Among them, the fixed point reaction force is the working load, the tensile node displacement is the fuse elongation, and the maximum value of the fuse structure node stress is the fuse's maximum node stress.

[0083] The fuse elongation and maximum nodal stress corresponding to the working load can be obtained. Based on the criteria for the two failure modes, the ultimate working load corresponding to this set of parameters can be found.

[0084] By conducting orthogonal simulation experiments with multiple sets of process parameters, selecting the optimal solution among various process parameters, and combining the optimal solutions, the best combination of process parameters can be obtained.

[0085] The simulation analysis method of the present invention will be described in detail below with reference to specific embodiments.

[0086] A locking fuse is needed to prevent loosening between two bolts. Based on the method of this invention, the preload force of the locking fuse and the pitch of the double-helix structure are analyzed in this scenario. The specific steps are as follows:

[0087] (1) Divide the preload and fuse pitch into multiple levels and perform orthogonal design. Take one pair of parameters and extract parameters such as bolt distance, bolt diameter, relative position and size of bolt fixing point in the scene, and use them as input parameters for analysis.

[0088] (2) Calculate the required fuse length at this location according to the formula for calculating the length of a single fuse;

[0089] (3) Establish an initial fuse model based on the fuse length and fuse diameter;

[0090] (4) Based on the dimensions of the fixed points, establish the bolt fixing point model and the rotation auxiliary model;

[0091] (5) Assemble each model according to its relative position in the application scenario to form an assembly model for finite element simulation;

[0092] (6) Set the material parameters according to the material of the fuse, and set the bolt fixing point model and the rotation auxiliary model as rigid bodies;

[0093] (7) Establish dynamic display analysis steps according to the folding, rotation, and stretching processes;

[0094] (8) Establish the interaction between the models based on the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse, and the coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model;

[0095] (9) Distribute more than 12 node seeds evenly on the circumference of the end face of the fuse. The global node seed size is 0.5mm. The element type is an eight-node linear hexahedral element. Enable reduced integration and hourglass control. Set the bolt fixing point model and rotation auxiliary model as discrete rigid elements with quadrilaterals as the main components.

[0096] (10) In the folding analysis step, control points are set at the center of the two end faces of the fuse. The control points are rotated 90 degrees around the Z-axis and a preload force is applied in the positive direction of the Y-axis.

[0097] In the rotation analysis step, the rotation auxiliary model is set to rotate around the Y-axis, the rotation angle is calculated according to the lead, and a preload force along the positive Y-axis is applied to the control points of the rotation auxiliary model.

[0098] In the tensile analysis step, a load that increases linearly along the positive Y-axis is applied at the control points of the rotational auxiliary model. The initial load is the preload and the final load is the breaking load.

[0099] (11) Perform finite element calculations and extract the fixed point reaction force, tensile node displacement, and fuse structure node stress from the results;

[0100] (12) Calculate the ultimate elongation and breaking load, and find the ultimate working load of this set of parameters according to the fuse failure mode criterion.

[0101] (13) Simulate multiple sets of process parameters, such as Figure 8 and Figure 9 Find the set of parameters with the largest ultimate working load, and the corresponding process parameters are the optimal fuse anti-loosening process parameters.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A simulation analysis method for process parameters in the forming process of anti-loosening fuses, characterized in that, Includes the following steps: An initial fuse model, a bolt fixing point model, and a rotation auxiliary model are established. The initial fuse model, the bolt fixing point model, and the rotation auxiliary model are then assembled to obtain a simulation model of the double helix fuse forming. The forming process of the anti-loosening fuse is decomposed into three analysis steps: folding, rotation, and tension. The interaction between the anti-loosening fuse, the bolt fixing point and the rotation auxiliary model and the effective conditions in each analysis step are set. The initial fuse model, bolt fixing point model, and rotation auxiliary model were meshed, and the load modes were set for the three analysis steps for simulation analysis. The reaction force at fixed points, the displacement of tensile nodes, and the stress at fuse structure nodes are obtained at set time intervals. Based on the fuse failure mode criteria, the ultimate working load corresponding to different process parameters is obtained. Orthogonal simulation experiments were conducted on each group of process parameters, and the group with the largest ultimate working load was taken as the optimal combination of process parameters.

2. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 1, characterized in that, The interaction between the anti-loosening fuse, the bolt fixing point, and the rotating auxiliary model includes the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse, and the coupling constraint between the end face of the anti-loosening fuse and the rotating auxiliary model.

3. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 2, characterized in that, Set the contact to a general contact, with contact properties including tangential and normal behavior. The friction coefficient of the tangential behavior is based on the friction coefficient of the corresponding material, and the normal behavior is a hard contact.

4. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 2, characterized in that, The interaction is effective in each analysis step under the following conditions: the contact between the anti-loosening fuse and the bolt fixing point, the self-contact of the anti-loosening fuse is effective in all three analysis steps, and the coupling constraint between the end face of the anti-loosening fuse and the rotation auxiliary model is effective in the rotation analysis step and the tension analysis step.

5. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 1, characterized in that, The steps for meshing the initial fuse model, bolt fixing point model, and rotation auxiliary model include: More than 12 seed nodes are evenly distributed on the circumference of the end face of the fuse, and the mesh element is an eight-node linear hexahedral element; the mesh element type of the bolt fixing point model and the rotation auxiliary model is a discrete rigid body element with quadrilateral as the main type.

6. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 1, characterized in that, The steps for setting the load mode for the three analysis steps include: In the folding analysis step, control points are set at the center of the two end faces of the fuse. The control points are rotated 90 degrees around the Z-axis and a preload force is applied in the positive direction of the Y-axis. After the simulation of this step is completed, the rotation auxiliary model moves in the negative direction of the Y-axis. In the rotation analysis step, the rotation auxiliary model rotates about the Y-axis. The length of the anti-loosening fuse is L, the lead is P, and a preload force along the positive Y-axis is applied to the control point of the rotation auxiliary model. In the double-helix fuse forming simulation model, the fuse length direction is the X-axis, the perpendicular bisector of the fuse in the horizontal plane is the Y-axis, and the vertical direction is the Z-axis. In the tensile analysis step, a load along the positive Y-axis is applied at the control point of the rotational auxiliary model. The initial load is the preload, and the final load is the breaking load.

7. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 1, characterized in that, The failure modes of the fuse include bolt loosening failure and fracture failure; the bolt loosening failure is when the elongation of the fuse reaches 20° of bolt rotation, and the fracture failure is when the maximum stress of the fuse exceeds the tensile strength of the fuse material.

8. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 7, characterized in that, The failure mode criterion for the fuse is to take the smaller of the maximum elongation working load and the breaking working load corresponding to each group of process parameters as the ultimate working load of that group of process parameters.

9. The simulation analysis method for process parameters of the anti-loosening fuse forming process according to claim 1, characterized in that, The preload and pitch of the anti-loosening fuse are divided into multiple levels and formed into multiple sets of process parameters. Orthogonal simulation tests are then conducted on each set of process parameters.

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