Rapid modeling method for bolt and nut fastener

Abstract

The invention relates to the technical field of modeling, in particular to a bolt and nut fastener quick modeling method which comprises the following steps: S1, a bolt and nut fastener model early-stage planning and parameter presetting stage: S1.1, drawing a three-dimensional model of a bolt and nut fastener by using three-dimensional design software; s1.2, setting each key parameter of a bolt and nut fastener, and realizing sketch feature and parameter association by using a'formula plate 'editing constraint function in a three-dimensional software system; and S1.3, according to a national fastener standard model series, assembling and associating the parameters of the bolt and nut fastener with the sizes in the standard model series. According to the method, one-key calling, one-key adjustment and one-key assembly are achieved through early-stage parameter planning and setting, standard association and later-stage template calling and parameter adjustment, the modeling efficiency and the model precision are improved, the design period is shortened, the cost is reduced, and the model display effect and the user experience are enhanced.

Description

Technical Field

[0001] The invention relates to the field of modeling, and in particular to a method for quickly modeling bolt and nut fasteners. Background Art

[0002] With the development of society, 3D models are being used more and more widely in various industries. In the field of mechanical manufacturing, 3D models can intuitively display the structure and appearance of products, help engineers optimize designs and perform simulation analysis, discover potential problems in advance, and reduce R&D costs and cycles; in the construction industry, 3D models can enable designers to plan building layouts, spatial relationships, and construction processes more clearly, making it easier for construction teams to understand design intent and improve construction efficiency and quality; in electronic equipment design, 3D models help designers layout and route complex circuit boards and internal structures, improving product performance and reliability.

[0003] However, in many 3D design software and BIM application software, bolt, nut and fastener modeling mostly adopts the method of generating entity features from sketches. This method has a complicated process, requires many dimensions to be controlled, and requires fine model features. When modeling, designers need to spend a lot of time drawing sketches and setting various dimensional parameters. The process is cumbersome and error-prone. At the same time, it is difficult to achieve parametric control and cannot quickly switch according to national fastener standard models. When modeling a large number of bolt, nut and fastener assemblies with many models, the efficiency is extremely low. This not only increases the 3D design cycle and design costs, but also affects the design accuracy and the user's 3D design and BIM technology application experience, which to a certain extent restricts the development of related industries. Summary of the invention

[0004] In view of this, the present invention provides a quick modeling method for bolt and nut fasteners, and the main technical problem to be solved is: to solve the problems of complex process, low efficiency, difficulty in parameterized control and inability to quickly switch standard models in existing bolt and nut fastener modeling methods.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a method for quickly modeling bolt and nut fasteners, comprising the following steps:

[0006] S1. Preliminary planning and parameter presetting of bolt and nut fastener models

[0007] S1.1. Use 3D design software to draw the 3D model of bolts, nuts and fasteners;

[0008] S1.2. Set the key parameters of bolt and nut fasteners, and use the "formula plate" editing constraint function in the 3D software system to associate sketch features with parameters;

[0009] S1.3. According to the national fastener standard model series, the parameters of the bolt and nut fasteners are assembled and associated with the dimensions in the standard model series to form a bolt and nut fastener assembly template;

[0010] S2. Rapid drawing and precise adjustment of bolt and nut fastener models

[0011] S2.1 When drawing the bolt and nut fastener model, use the template design function in the 3D design software to create a bolt and nut fastener component template that contains entity features, related parameters, and input and output information;

[0012] S2.2. Use the entity creation function of the 3D design software to import the bolt, nut and fastener assembly template and adjust the position of the bolt, nut and fastener;

[0013] S2.3. According to the design requirements, modify and input the relevant parameters of the bolt, nut, fastener assembly template to complete the three-dimensional modeling of the bolt, nut, and washer assembly.

[0014] By adopting the above technical solution, an integrated modeling process is realized from model drawing, parameter association to standard model association, and then to rapid drawing and precise adjustment, which improves the modeling efficiency and accuracy of bolt and nut fasteners.

[0015] As a further description of the above technical solution:

[0016] The three-dimensional model of bolt and nut fasteners drawn using three-dimensional design software in step S1.1 specifically includes:

[0017] Use 3D design software to first draw the 3D model of the bolt head, then draw the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head, then draw the 3D model of the washer on the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod, and finally draw the 3D model of the nut based on the termination surface of the 3D model of the washer.

[0018] By adopting the above technical solution, the model is drawn according to the actual assembly sequence of the fasteners.

[0019] As a further description of the above technical solution:

[0020] Drawing the 3D model of the bolt head specifically includes:

[0021] Use 3D design software to draw a sketch of the bolt head structure, then stretch the bolt head sketch through the stretch entity operation to establish the bolt head entity feature, then create a new bolt head across-the-side width parameter S and a bolt head diagonal width parameter e, and define the values ​​of the bolt head across-the-side width parameter S and the bolt head diagonal width parameter e.

[0022] By adopting the above technical solution, the key steps and parameter settings of bolt head modeling are realized, which facilitates the subsequent adjustment of the model according to needs.

[0023] As a further description of the above technical solution:

[0024] Drawing the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head specifically includes:

[0025] Using 3D design software, first draw a bolt rod structure sketch on the bottom surface of the bolt head 3D model, then stretch the bolt rod sketch through the stretch entity operation to establish the bolt rod entity feature, then create a new bolt head thickness parameter K, bolt length parameter I, and thread major diameter parameter d, and then define the bolt head thickness parameter K value, bolt length parameter I value, and thread diameter parameter d value.

[0026] By adopting the above technical solution, the key steps and parameter settings of bolt rod modeling are realized, which facilitates the subsequent adjustment of the model according to needs.

[0027] As a further description of the above technical solution:

[0028] Drawing the washer 3D model on the contact surface between the bolt head 3D model and the bolt rod 3D model specifically includes:

[0029] Use 3D design software to establish the starting surface of the washer model based on the offset plane of the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod. Then create a distance parameter L between the clamping surface and the starting surface of the washer model, and then define the value of the distance parameter L between the clamping surface and the starting surface of the washer model.

[0030] By adopting the above technical solution, the key steps and parameter settings of gasket modeling are realized, which facilitates the subsequent adjustment of the model according to needs.

[0031] As a further description of the above technical solution:

[0032] Drawing the nut 3D model based on the end surface of the washer 3D model specifically includes:

[0033] Use 3D design software to draw a nut structure sketch based on the termination surface of the washer 3D model, extrude to create the nut solid feature, then create new nut width across flats parameter S, nut diagonal width parameter e, nut thickness parameter m, nut internal thread major diameter parameter D, and then define the values ​​of nut width across flats parameter S, nut diagonal width parameter e, nut thickness parameter m, and nut internal thread diameter parameter D.

[0034] By adopting the above technical solution, the key steps and parameter settings of nut modeling are realized, which facilitates the subsequent adjustment of the model according to needs.

[0035] As a further description of the above technical solution:

[0036] In step S1.2, the key parameters of the bolt and nut fasteners are linked to the sketch features and parameters using the "Formula Plate" editing constraint function in the 3D software system, including:

[0037] By using the design table creation function of the tool in the three-dimensional software, the parameter sizes of bolts, nuts and washers of the same specification and model are combined, and the constraint editing function of the "formula module" is used to create a new parameter assignment rule: when F (a certain sketch feature) = F (any value of the parameter in the design table), then F (other sketch features) = F (other corresponding values ​​of the group of parameters in the design table), so as to determine the type, nominal diameter and structural size of the bolts, nuts and washers.

[0038] By adopting the above technical solution, unified management and association of bolt, nut and washer parameters are achieved, making it convenient to quickly adjust model parameters according to standard models or design requirements.

[0039] As a further description of the above technical solution:

[0040] In step S1.3, according to the national fastener standard model series, the parameters of the bolt and nut fasteners are assembled and associated with the dimensions in the standard model series, including:

[0041] Bolt parameters are associated with the GB / T5780-GB / T5786 bolt size list for assembly;

[0042] Nut parameters are associated with the GB / T6710-GB / T6716 ​​nut size list for assembly;

[0043] The gasket parameters are assembled and associated with the standard model series dimensions in the GB / T97.1-GB / T97.6 gasket dimension list.

[0044] By adopting the above technical solution, the bolt and nut fastener model can quickly match the national standard model, thereby improving the standardization and versatility of modeling.

[0045] As a further description of the above technical solution:

[0046] In step S2.3, according to the design requirements, the relevant parameters of the bolt and nut fastener component template are modified as follows:

[0047] Simply input the values ​​of the relevant parameters in the 3D design software, and then select the standard model from the drop-down menu.

[0048] By adopting the above technical solution, a convenient parameter modification method is provided for users, which reduces the difficulty of operation and improves the design efficiency.

[0049] As a further description of the above technical solution:

[0050] In step S2.2, the entity creation function of the 3D design software is used to import the bolt and nut fastener assembly template and adjust the position of the bolt and nut fastener assembly, including:

[0051] Use the quick instantiation command in the entity creation function of the 3D design software, call up the bolt, nut, and washer assembly templates under the part geometry or geometry structure tree, enter the starting point, axis direction, section direction and other positioning elements, and modify them until the template is in the correct orientation.

[0052] By adopting the above technical solution, the component template can be quickly transferred in and accurately positioned, which improves the convenience and accuracy of modeling.

[0053] By means of the above technical solution, the method for quick modeling of bolt and nut fasteners of the present invention has at least the following beneficial effects:

[0054] 1. Compared with the existing technology, this method for quick modeling of bolt and nut fasteners realizes the functions of "one-key call, one-key adjustment and one-key assembly" by accurately setting parameters and establishing parameter associations in the early planning stage, assembling parameters in accordance with national standards, and using template design and fast instantiation commands in the drawing and adjustment stages. It not only improves the model accuracy of a single fastener and meets the requirements of component manufacturing and installation, but also greatly improves the overall three-dimensional design efficiency, shortens the design cycle, saves costs, and improves the smoothness and clarity of a large number of fasteners in large and complex mechanical equipment or steel structures displayed on the BIM platform, thereby enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of the preliminary planning and parameter presetting stage of the bolt and nut fastener model of the present invention;

[0056] Figure 2 A flowchart of the fast drawing and precise adjustment phase of the bolt and nut fastener model of the present invention;

[0057] Figure 3 This is the national standard bolt structure parameter diagram;

[0058] Figure 4 This is the structural parameter diagram of the national standard model gasket;

[0059] Figure 5 This is the national standard model nut structure parameter diagram;

[0060] Figure 6 Schematic diagram of the bolt, nut and washer assembly template.

[0061] Legend:

[0062] Figure 3 In the figure, S is the inscribed circle diameter of the bolt head, e is the circumscribed circle diameter of the bolt head, k is the thickness of the bolt head, I is the length of the bolt shank, and d is the nominal diameter of the bolt.

[0063] Figure 4 In the figure, d1 is the inner diameter of the gasket, d2 is the outer diameter of the gasket, and h is the thickness of the gasket.

[0064] Figure 5 In the figure, S is the inscribed circle diameter of the nut, e is the circumscribed circle diameter of the nut, m is the thickness of the nut, and D is the nominal diameter of the nut. DETAILED DESCRIPTION

[0065] Reference Figure 1-6 The invention provides a method for quickly modeling a bolt and nut fastener, comprising the following steps:

[0066] S1. Preliminary planning and parameter presetting of bolt and nut fastener models

[0067] S1.1. Use 3D design software to draw the 3D model of bolts, nuts and fasteners;

[0068] S1.2. Set the key parameters of bolts, nuts and fasteners, and use the "Formula Plate" in the 3D software system to edit constraints to associate sketch features with parameters. Setting key parameters and establishing associations can enable parametric control of the model, making it easier to adjust the model according to different needs and improve modeling flexibility and efficiency.

[0069] S1.3. According to the national fastener standard model series, the parameters of bolt and nut fasteners are assembled and associated with the dimensions in the standard model series. The parameters are associated with the national standard models to ensure the standardization and universality of the model. The standard model can be quickly switched according to actual needs, avoiding the trouble of repeated modeling, and forming a bolt and nut fastener assembly template;

[0070] S2. Rapid drawing and precise adjustment of bolt and nut fastener models

[0071] S2.1 When drawing the bolt and nut fastener model, use the template design function in the 3D design software to create a bolt and nut fastener component template that contains entity features, related parameters, and input and output information;

[0072] S2.2. Use the entity creation function of the 3D design software to import the bolt, nut, and fastener component template and adjust the position of the bolt, nut, and fastener. By importing the template and adjusting the position, the bolt, nut, and fastener model can be quickly added to the design scene and placed in the correct position and direction.

[0073] S2.3. According to the design requirements, modify the relevant parameters of the bolt, nut, fastener assembly template, complete the three-dimensional modeling of the bolt, nut, and washer assembly, modify the parameters according to the specific design requirements, make the model meet the actual needs, and complete the final modeling work.

[0074] The three-dimensional model of bolt and nut fasteners drawn using three-dimensional design software in step S1.1 specifically includes:

[0075] Use 3D design software to first draw the 3D model of the bolt head, then draw the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head, then draw the 3D model of the washer on the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod, and finally draw the 3D model of the nut based on the termination surface of the 3D model of the washer.

[0076] Drawing the 3D model of the bolt head specifically includes:

[0077] Use 3D design software to draw a sketch of the bolt head structure. Drawing a sketch is the basis for building a 3D model. The basic shape and size of the bolt head are determined by the sketch. Then the bolt head sketch is stretched through the stretch entity operation to establish the bolt head entity feature. The stretching operation converts the 2D sketch into a 3D entity to form the basic shape of the bolt head. Then, create a new bolt head across-edge width parameter S and a bolt head diagonal width parameter e, and define the values ​​of the bolt head across-edge width parameter S and the bolt head diagonal width parameter e. These two parameters determine the size of the bolt head. Defining their values ​​can accurately control the specifications of the bolt head.

[0078] Drawing the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head specifically includes:

[0079] Using 3D design software, first draw a sketch of the bolt rod structure on the bottom surface of the bolt head 3D model, and then stretch the bolt rod sketch through the stretch entity operation to establish the bolt rod entity feature. First draw the sketch and then stretch it to form the solid structure of the bolt rod. Then create a new bolt head thickness parameter K, bolt length parameter I, and thread major diameter parameter d. Then define the values ​​of the bolt head thickness parameter K, bolt length parameter I, and thread diameter parameter d. These parameters determine the size and specifications of the bolt rod, providing accurate data for subsequent design and application.

[0080] Drawing the washer 3D model on the contact surface between the bolt head 3D model and the bolt rod 3D model specifically includes:

[0081] Using 3D design software, the starting surface of the washer model is established based on the offset plane with the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod as the basic contact surface, and the starting position of the washer is determined to ensure that the assembly relationship between the washer, the bolt head and the bolt rod is correct. Then, a new distance parameter L between the clamping surface and the starting surface of the washer model is created, and then the value of the distance parameter L between the clamping surface and the starting surface of the washer model is defined. Parameter L determines the installation position of the washer on the bolt.

[0082] Drawing the nut 3D model based on the end surface of the washer 3D model specifically includes:

[0083] Use 3D design software, draw the nut structure sketch based on the termination surface of the washer 3D model, stretch to establish the nut solid feature, draw the nut sketch and stretch to form a solid, which is the key step to construct the nut model. Then create the nut opposite side width parameter S, nut diagonal width parameter e, nut thickness parameter m, nut internal thread major diameter parameter D, and then define the nut opposite side width parameter S value, nut diagonal width parameter e value, nut thickness parameter m value and nut internal thread diameter parameter D. These parameters determine the size and specifications of the nut to ensure the matching accuracy of the nut and the bolt.

[0084] In step S1.2, the key parameters of the bolt and nut fasteners are linked to the sketch features and parameters using the "Formula Plate" editing constraint function in the 3D software system, including:

[0085] Through the function of creating a design table in the tool in the three-dimensional software, the parameter sizes of bolts, nuts and washers of the same specification and model are combined, and the relevant parameters are integrated in the design table for unified management and calling. The constraint editing function of the "formula module" is used to create a new parameter assignment rule: when F (a certain sketch feature) = F (any value of the parameter in the design table), then F (other sketch features) = F (other corresponding values ​​of the group of parameters in the design table), so as to determine the type, nominal diameter and structural size of the bolts, nuts and washers. In this way, the association between parameters is established, and other related parameters are automatically adjusted according to the change of one parameter, thereby improving the efficiency and accuracy of parameter adjustment.

[0086] In step S1.3, according to the national fastener standard model series, the parameters of the bolt and nut fasteners are assembled and associated with the dimensions in the standard model series, including:

[0087] Bolt parameters are associated with the GB / T5780-GB / T5786 bolt size list for assembly;

[0088] Nut parameters are associated with the GB / T6710-GB / T6716 ​​nut size list for assembly;

[0089] The gasket parameters are assembled and associated with the standard model series dimensions in the GB / T97.1-GB / T97.6 gasket dimension list.

[0090] In step S2.3, according to the design requirements, the relevant parameters of the bolt and nut fastener component template are modified as follows:

[0091] Directly input the values ​​of relevant parameters in the 3D design software, select the standard model in the drop-down menu, etc. to operate, provide a variety of parameter modification methods to meet the operating habits of different users, and improve the convenience of parameter modification.

[0092] In step S2.2, the entity creation function of the 3D design software is used to import the bolt and nut fastener assembly template and adjust the position of the bolt and nut fastener assembly, including:

[0093] Use the entity creation function in the 3D design software and the quick instantiation command to call in the bolt, nut, and washer component templates in the part geometry or geometry structure tree, enter the starting point, axis direction, section direction and other positioning elements, modify the template until the orientation is correct, enter the positioning elements and adjust the orientation to ensure that the position and orientation of the component template in the design scene meet the design requirements.

[0094] Working principle: First, use 3D design software to draw 3D models in the order of bolt head, bolt rod, washer and nut. In the process of drawing each component model, create and define the corresponding key parameters respectively. Through the "formula plate" editing constraint function in the 3D software system, associate the sketch features with these parameters, so that modifying the parameters can modify the model synchronously. At the same time, the parameters of bolts, nuts and washers are assembled and associated with the dimensions in the national fastener standard model series to make the model standardized and universal.

[0095] Then, when using it, use the template design function of the 3D design software to integrate the previously drawn solid features, set related parameters, and input and output information into a bolt, nut, and fastener component template. Use the entity creation function of the 3D design software to call the component template under the part geometry or geometry structure tree through the quick instantiation command, and enter the starting point, axis direction, section direction and other positioning elements to adjust the template to the correct position.

[0096] Finally, according to the design requirements, modify the relevant parameters of the template by directly entering values ​​or selecting the standard model in the drop-down menu to complete the 3D modeling of the bolt, nut and washer assembly.

[0097] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for quickly modeling bolt and nut fasteners, characterized in that: The following steps are involved: S1. Preliminary planning and parameter presetting of bolt and nut fastener models S1.

1. Use 3D design software to draw the 3D model of bolts, nuts and fasteners; S1.

2. Set the key parameters of bolt and nut fasteners, and use the "Formula Plate" editing constraint function in the 3D software system to associate sketch features with parameters; S1.

3. According to the national fastener standard model series, the parameters of the bolt and nut fasteners are assembled and associated with the dimensions in the standard model series to form a bolt and nut fastener assembly template; S2. Rapid drawing and precise adjustment of bolt and nut fastener models S2.1 When drawing the bolt and nut fastener model, use the template design function in the 3D design software to create a bolt and nut fastener component template that contains entity features, related parameters, and input and output information; S2.

2. Use the entity creation function of the 3D design software to import the bolt, nut and fastener assembly template and adjust the position of the bolt, nut and fastener; S2.

3. According to the design requirements, modify and input the relevant parameters of the bolt, nut, fastener assembly template to complete the three-dimensional modeling of the bolt, nut, and washer assembly.

2. A method for quick modeling of bolt and nut fasteners according to claim 1, characterized in that: Drawing a three-dimensional model of the bolt and nut fastener using three-dimensional design software in step S1.1 specifically includes: Use 3D design software to first draw the 3D model of the bolt head, then draw the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head, then draw the 3D model of the washer on the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod, and finally draw the 3D model of the nut based on the termination surface of the 3D model of the washer.

3. A method for quick modeling of bolt and nut fasteners according to claim 2, characterized in that: Drawing the 3D model of the bolt head specifically includes: Use 3D design software to draw a sketch of the bolt head structure, then stretch the bolt head sketch through the stretch entity operation to establish the bolt head entity feature, then create a new bolt head across-the-side width parameter S and a bolt head diagonal width parameter e, and define the values ​​of the bolt head across-the-side width parameter S and the bolt head diagonal width parameter e.

4. A method for quick modeling of bolt and nut fasteners according to claim 3, characterized in that: Drawing the 3D model of the bolt rod on the bottom surface of the 3D model of the bolt head specifically includes: Using 3D design software, first draw a bolt rod structure sketch on the bottom surface of the bolt head 3D model, then stretch the bolt rod sketch through the stretch entity operation to establish the bolt rod entity feature, then create a new bolt head thickness parameter K, bolt length parameter I, and thread major diameter parameter d, and then define the bolt head thickness parameter K value, bolt length parameter I value, and thread diameter parameter d value.

5. A method for quick modeling of bolt and nut fasteners according to claim 4, characterized in that: Drawing the washer 3D model on the contact surface between the bolt head 3D model and the bolt rod 3D model specifically includes: Use 3D design software to establish the starting surface of the washer model based on the offset plane of the contact surface between the 3D model of the bolt head and the 3D model of the bolt rod. Then create a distance parameter L between the clamping surface and the starting surface of the washer model, and then define the value of the distance parameter L between the clamping surface and the starting surface of the washer model.

6. A method for quick modeling of bolt and nut fasteners according to claim 5, characterized in that: Drawing the nut 3D model based on the end surface of the washer 3D model specifically includes: Use 3D design software to draw a nut structure sketch based on the termination surface of the washer 3D model, extrude to create the nut solid feature, then create new nut width across flats parameter S, nut diagonal width parameter e, nut thickness parameter m, nut internal thread major diameter parameter D, and then define the values ​​of nut width across flats parameter S, nut diagonal width parameter e, nut thickness parameter m, and nut internal thread diameter parameter D.

7. A method for quick modeling of bolt and nut fasteners according to claim 6, characterized in that: The key parameters of the bolt and nut fasteners in step S1.2 are specifically related to the sketch features and parameters using the "Formula Plate" editing constraint function in the 3D software system: By using the design table creation function of the tool in the 3D software, the parameter sizes of bolts, nuts and washers of the same specification and model are combined, and the constraint editing function of the "formula module" is used to create a new parameter assignment rule: when F (a certain sketch feature) = F (any value of the parameter in the design table), then F (other sketch features) = F (other corresponding values ​​of the group of parameters in the design table).

8. A method for quick modeling of bolt and nut fasteners according to claim 6, characterized in that: In step S1.3, according to the national fastener standard model series, assembling and associating the parameters of the bolt and nut fasteners with the dimensions in the standard model series specifically includes: Bolt parameters are associated with the GB / T5780-GB / T5786 bolt size list for assembly; Nut parameters are associated with the GB / T6710-GB / T6716 ​​nut size list for assembly; The gasket parameters are assembled and associated with the standard model series dimensions in the GB / T97.1-GB / T97.6 gasket dimension list.

9. A method for quick modeling of bolt and nut fasteners according to claim 8, characterized in that: In step S2.3, the relevant parameters of the bolt, nut and fastener assembly template are modified according to the design requirements as follows: Enter the values ​​of the relevant parameters directly in the 3D design software, and then select the standard model from the drop-down menu.

10. A method for quick modeling of bolt and nut fasteners according to claim 6, characterized in that: In the step S2.2, the entity creation function of the three-dimensional design software is used to import the bolt and nut fastener assembly template, and the position of the bolt and nut fastener assembly is adjusted, which specifically includes: Use the quick instantiation command in the entity creation function of the 3D design software, call in the bolt, nut, and washer assembly template under the part geometry or geometry structure tree, enter the starting point, axis direction, and section direction positioning elements, and modify the template until the orientation is correct.

Images