Finite element parametric modeling method, device and equipment for bolt and nut connecting piece

Abstract

The invention provides a finite element parametric modeling method and device for a bolt and nut connecting piece and electronic equipment. The method comprises the following steps: acquiring parameters of a bolt model and a nut model, and constructing five parts of a screw middle cuboid, a screw hollow cylinder, a bolt head hollow regular hexahedron, a screw and thread body connecting section and a bolt thread body of the bolt model based on the parameters of the bolt model; constructing three parts of a nut hollow regular hexahedron, a nut hexahedron and thread body connection section and a nut thread body of the nut model based on the parameters of the nut model; other parts except the connecting section of the screw rod and the thread body and the connecting section of the nut hexahedron and the thread body are respectively cut into polyhedrons, and the polyhedrons are divided in a mapping mode; dividing the connecting section of the screw rod and the thread body and the connecting section of the nut hexahedron and the thread body in a free dividing mode; and the five parts of the bolt model and the three parts of the nut model are bonded respectively. According to the invention, the actual working state of the connecting piece can be comprehensively reflected in simulation.

Description

Technical Field

[0001] The present invention relates to the technical field of finite element analysis of bolts and nuts, and in particular to a finite element parametric modeling method, device and electronic equipment for bolt and nut connectors. Background Art

[0002] Bolts and nuts are parts that are screwed together for fastening. They are widely used in many engineering structures due to their high strength and convenient assembly and disassembly. Bolts and nuts are so important in their application, but there is a large data discreteness in their performance experiments. In order to improve the accuracy of bolt data analysis, the method of combining experiments and simulations is currently used.

[0003] The current finite element modeling of bolt and nut connections generally uses simplified models for simulation calculations. However, the inventors found in the process of research and practice that when the analysis has high requirements for connection details, this simplified model, especially the simplification or neglect of the threaded part, cannot accurately reflect the complexity and mechanical properties of the actual threaded connection, thus affecting the accuracy of the results. The traditional modeling method lacks the refined processing of bolt and nut connections, so it is difficult to fully reflect the actual working status of the connection in the simulation. Summary of the invention

[0004] The present invention provides a finite element parametric modeling method, device and electronic equipment for bolt and nut connectors to solve the problem that traditional modeling methods lack refined processing of bolt and nut connectors and are difficult to fully reflect the actual working status of the connectors in simulation.

[0005] In a first aspect, the present invention provides a finite element parametric modeling method for a bolt-nut connection, comprising: obtaining parameters of a bolt model and a nut model, the parameters including geometric dimensions and material properties;

[0006] Based on the parameters of the bolt model, the five parts of the bolt model are constructed: the middle cuboid of the screw, the hollow cylinder of the screw, the hollow hexahedron of the bolt head, the connecting section between the screw and the threaded body, and the bolt threaded body;

[0007] The three parts of the nut model are constructed based on the parameters of the nut model: the nut hollow hexahedron, the connecting section between the nut hexahedron and the threaded body, and the nut threaded body;

[0008] The other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are divided into polyhedrons respectively, and the division is performed by mapping; the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are divided by free division;

[0009] Bond the five parts of the bolt model and the three parts of the nut model separately.

[0010] In a possible implementation, the middle cuboid of the screw is a cuboid with a square cross section inside the screw cylinder, the center of the square coincides with the center of the cross section of the screw cylinder, and the length of the middle cuboid of the screw is equal to the length of the bolt;

[0011] The hollow screw cylinder is the part of the screw cylinder without the middle cuboid and the threaded cylinder of the screw;

[0012] The hollow hexahedron of the bolt head is the part of the bolt head without the cylinder of the screw rod;

[0013] The connecting section between the screw and the threaded body is the part of the threaded cylinder without threads;

[0014] The threaded body of the bolt is the threads of the bolt.

[0015] In a possible implementation, the nut thread body is a thread of the nut;

[0016] The connecting section between the nut hexahedron and the threaded body is a circular ring that wraps around the outside of the nut threaded body;

[0017] The hollow regular hexahedron in the nut is the portion of the nut obtained by removing the nut thread body and the connecting section between the nut hexahedron and the thread body.

[0018] In a possible implementation, the geometric dimensions include bolt nominal diameter, screw rod length, thread segment length, thread pitch, tooth angle, thread minor diameter, thread mid-diameter, bolt head inscribed circle diameter, bolt head thickness, and nut thickness.

[0019] In one possible implementation, the material properties include elastic modulus, density, Poisson's ratio, friction coefficient, and constitutive relations.

[0020] In a possible implementation, the other parts except the connecting section between the screw and the threaded body, the hexahedron of the nut and the connecting section of the threaded body are cut into polyhedrons respectively, including:

[0021] The following formula is used to cut the other parts except the connecting section between the screw and the threaded body, the nut hexahedron and the connecting section between the threaded body into polyhedrons:

[0022]

[0023] Where y1 and y2 are the mesh side lengths during mesh division, and y is equal to 1 / 2 of the nominal bolt diameter.

[0024] In a possible implementation, a method for constructing a bolt thread body is to generate a first helix according to parameters of a bolt model, generate a first thread tooth section at an end of the first helix, and generate the bolt thread body based on the first thread tooth section.

[0025] In a possible implementation, the method for constructing the nut thread body is to generate a second helix according to the parameters of the nut model, generate a second thread tooth section at the end of the second helix, and generate the nut thread body based on the second thread tooth section.

[0026] In a second aspect, the present invention provides a finite element parametric modeling device for a bolt and nut connection, comprising: an acquisition module for acquiring parameters of a bolt model and a nut model, the parameters including geometric dimensions and material properties;

[0027] A construction module is used to construct five parts of the bolt model, namely, a screw middle cuboid, a screw hollow cylinder, a bolt head hollow hexahedron, a screw and thread body connection section, and a bolt thread body, based on the parameters of the bolt model;

[0028] The construction module is also used to construct the three parts of the nut model, namely, the nut hollow regular hexahedron, the connecting section between the nut hexahedron and the threaded body, and the nut threaded body, based on the parameters of the nut model;

[0029] A segmentation module is used to segment the other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body into polyhedrons, and divide them by mapping; and divide the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body by free segmentation;

[0030] The bonding module is used to bond the five parts of the bolt model and the three parts of the nut model respectively.

[0031] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the processor implements the steps of the method described in the first aspect or any possible implementation manner of the first aspect.

[0032] The present invention provides a finite element parametric modeling method, device and electronic device for bolt and nut connectors. The method comprises obtaining parameters of a bolt model and a nut model, constructing five parts of the bolt model, namely, a screw middle cuboid, a screw hollow cylinder, a bolt head hollow regular hexahedron, a screw and threaded body connection section and a bolt threaded body based on the parameters of the bolt model; constructing three parts of the nut model, namely, a nut hollow regular hexahedron, a nut hexahedron and threaded body connection section and a nut threaded body based on the parameters of the nut model; dividing the other parts except the screw and threaded body connection section, the nut hexahedron and threaded body connection section into polyhedrons respectively, and dividing them by mapping; dividing the screw and threaded body connection section, the nut hexahedron and threaded body connection section by free division; and bonding the five parts of the bolt model and the three parts of the nut model respectively. The present invention improves the accuracy of modeling by constructing the bolt model in five parts, constructing the nut model in three parts, and cutting the specific part into polyhedrons, and then finely dividing each part, and finally bonding each part together. The present invention can fully reflect the actual working state of the connector in simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a flow chart of an implementation method of a finite element parametric modeling method for a bolt and nut connection provided by an embodiment of the present invention;

[0035] Figure 2 1 is a schematic diagram of the five-part construction of a bolt model provided by an embodiment of the present invention;

[0036] Figure 3 1 is a schematic diagram of the three-part construction of a nut model provided by an embodiment of the present invention;

[0037] Figure 4A It is a schematic diagram of the side cut dimensions of a bolt head provided by an embodiment of the present invention;

[0038] Figure 4B is a schematic diagram of a side cut of a bolt head provided by an embodiment of the present invention;

[0039] Figure 4C is a schematic diagram of mesh division of the side surface of a bolt head provided by an embodiment of the present invention;

[0040] Figure 5A is a schematic diagram of the side cut of the bolt tail provided by an embodiment of the present invention;

[0041] Figure 5B is a schematic diagram of mesh division of the side surface of the bolt tail provided by an embodiment of the present invention;

[0042] Fig. 6A Schematic diagram of the cutting of the side surface of the screw tail provided by an embodiment of the present invention;

[0043] Figure 6B Schematic diagram of mesh division of the screw tail side surface provided by an embodiment of the present invention;

[0044] Fig. 7A is a schematic diagram of the side cutting of a nut provided by an embodiment of the present invention;

[0045] Figure 7B is a schematic diagram of mesh division of a nut side surface provided by an embodiment of the present invention;

[0046] Fig. 8A It is a bolt and nut cutting model provided by an embodiment of the present invention;

[0047] Figure 8B is a bolt and nut mesh model provided by an embodiment of the present invention;

[0048] Fig. 9 It is a structural schematic diagram of a finite element parametric modeling device for a bolt and nut connection provided by an embodiment of the present invention;

[0049] Fig.10 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] 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 invention. However, it should be clear to those skilled in the art that the present invention may 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 invention.

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0052] Finite Element Method (FEM) is a numerical technique for finding approximate solutions to boundary value problems of partial differential equations. When solving, the entire problem area is decomposed, and each sub-area becomes a simple part, which is called a finite element. It is widely used in structural analysis, heat transfer, fluid flow and other fields. It divides complex problems into simple finite elements and then combines them into a global set of equations for solution. It has the advantages of being able to accurately represent complex geometric figures, including different material properties, simple representation of the overall solution, and capturing local effects.

[0053] Bolts and nuts are a type of fastener used to fasten and connect two parts with through holes to form a bolted connection. Bolted connections are detachable connections. The main purpose of nuts is to connect more than two objects. By wrapping the nut around the bolt or screw, two objects can be firmly connected together. Nuts can connect different materials such as metal, wood and plastic to achieve mechanical connections. The functions of bolts include connecting, tightening, distributing loads and adjusting the position and direction of parts.

[0054] The modeling and analysis of bolts and nuts has important application significance in engineering applications. However, the traditional modeling method lacks the refined processing of bolt and nut connectors, so it is difficult to fully reflect the actual working state of the connector in the simulation. In order to solve this problem, the present invention proposes a finite element parametric modeling method for bolt and nut connectors, with special attention to the mesh accuracy of the threaded part. By implementing a more refined mesh division, this modeling method can accurately simulate the geometric characteristics and mechanical properties of the thread, thereby achieving accurate prediction of the performance of the bolt and nut connector. This refined modeling method not only improves the simulation accuracy, but also provides engineers with a more reliable design and analysis basis, which helps to optimize the design and performance evaluation of bolt and nut connectors. By focusing on the mesh accuracy of the threaded part, the present invention brings significant improvements to the finite element analysis of bolt and nut connectors.

[0055] For a more detailed description of this method, see Figure 1 , Figure 1 This is a flowchart of a method for implementing finite element parametric modeling of a bolt and nut connection provided by an embodiment of the present invention. The details are as follows:

[0056] In step 101, parameters of a bolt model and a nut model are obtained.

[0057] Among them, parameters include geometric dimensions and material properties.

[0058] In one possible implementation, the geometric dimensions include the nominal diameter d of the bolt, the length l of the screw, the length b of the thread segment, the thread pitch p, the tooth angle α, the thread minor diameter d1, the thread median diameter d2, the bolt head inscribed circle diameter smax, the bolt head thickness kgc and the nut thickness m.

[0059] For example, the nominal diameter of the bolt d=16 mm, the length of the screw rod l=65 mm, the length of the thread segment b=38 mm, the thread pitch p=2 mm, and the tooth profile angle α=60° can be selected.

[0060] For example, the thread minor diameter d1 = d-2*5 / 8*(0.5*p*cos(refa / 2) / sin(refa / 2)), the thread middle diameter d2 = d-2*3 / 8*(0.5*p*cos(refa / 2) / sin(refa / 2)), the bolt head inscribed circle diameter smax = 24mm, the bolt head thickness kgc = 10mm and the nut thickness m = 15mm can be selected.

[0061] In one possible implementation, the material properties include elastic modulus, density, Poisson's ratio, friction coefficient, and constitutive relations.

[0062] For example, the elastic modulus can be 2×1011Pa and the density can be 7850kg / m 3 , Poisson's ratio is 0.3 and the coefficient of friction is 0.15.

[0063] For example, in different simulation types and application scenarios, other property parameters may also be set, such as various property parameters such as thermal expansion coefficient, resistivity and corrosion rate.

[0064] In step 102, five parts of the bolt model are constructed based on the parameters of the bolt model, namely, the middle cuboid of the screw, the hollow cylinder of the screw, the hollow regular hexahedron of the bolt head, the connecting section between the screw and the threaded body, and the bolt threaded body.

[0065] like Figure 2 As shown, the five parts are respectively represented as: the middle rectangular parallelepiped L1 of the screw, the hollow cylinder L2 of the screw, the hollow regular hexahedron L3 of the bolt head, the connecting section L4 of the screw and the threaded body, and the bolt threaded body L5.

[0066] Specifically, the middle cuboid L1 of the screw is a cuboid with a square cross section inside the screw cylinder, the center of the square coincides with the center of the cross section of the screw cylinder, and the length of the middle cuboid of the screw is equal to the length of the bolt;

[0067] The screw hollow cylinder L2 is the part of the screw cylinder without the middle cuboid L1 and the threaded cylinder of the screw;

[0068] The hollow hexahedron L3 of the bolt head is the portion of the bolt head without the cylinder of the screw rod;

[0069] The connecting section L4 between the screw and the threaded body is the part where the thread is removed from the threaded cylinder;

[0070] The bolt thread body L5 is the thread of the bolt.

[0071] In a possible implementation, the bolt thread body L5 is constructed by generating a first helix according to parameters of a bolt model, generating a first thread tooth section at an end of the first helix, and generating the bolt thread body L5 based on the first thread tooth section.

[0072] Specifically, first, a first helix is ​​generated by looping according to specific parameters of the bolt. Then, the shape of the thread tooth section is drawn at the end of the first helix. Finally, the bolt thread body L5 is generated by dragging the thread tooth section using the first helix.

[0073] In step 103, three parts of the nut model are constructed based on the parameters of the nut model, namely, the nut hollow regular hexahedron, the connecting section between the nut hexahedron and the threaded body, and the nut threaded body.

[0074] like Figure 3 As shown, the three parts are respectively represented as: a nut hollow regular hexahedron M1, a nut hexahedron and threaded body connecting section M2, and a nut threaded body M3.

[0075] Specifically, the nut thread body M3 is the thread of the nut;

[0076] The connecting section M2 between the nut hexahedron and the threaded body is a circular ring that wraps around the outside of the nut threaded body M3;

[0077] The hollow regular hexahedron M1 of the nut is the portion of the nut obtained by removing the nut threaded body M3 and the connecting section between the nut hexahedron and the threaded body M2.

[0078] In a possible implementation, the method for constructing the nut thread body M3 is to generate a second helix according to the parameters of the nut model, generate a second thread tooth section at the end of the second helix, and generate the nut thread body M3 based on the second thread tooth section.

[0079] Specifically, first, a second helix is ​​generated by looping according to specific parameters of the nut. Then, the shape of the thread tooth section is drawn at the end of the second helix. Finally, the nut thread body M3 is generated by dragging the thread tooth section using the second helix.

[0080] In step 104, the other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are divided into polyhedrons respectively, and the division is performed by mapping; the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are divided by free division.

[0081] Exemplarily, the present invention divides the other parts except the screw and threaded body connecting section L4, the nut hexahedron and the threaded body connecting section M2 into hexahedrons respectively.

[0082] The following formula is used to cut the other parts except the connecting section L4 between the screw and the threaded body, the hexahedron of the nut and the connecting section M2 of the threaded body into hexahedrons:

[0083]

[0084] Where y1 and y2 are the mesh side lengths during mesh division, and y is equal to 1 / 2 of the nominal bolt diameter.

[0085] For example, the bolt head side is divided based on this formula, such as Figure 4A As shown, the result after segmentation is shown in Figure 4B. Further, Figure 4C Result diagram of meshing the side surface of the bolt head.

[0086] In the same way, we get the following figure: Figure 5A This is a schematic diagram of the side cutting of the bolt tail. Figure 5B This is a schematic diagram of the mesh division of the bolt tail side; Fig. 6A This is a schematic diagram of the side cutting of the screw tail. Figure 6B This is a schematic diagram of mesh division on the side of the screw tail; Fig. 7A This is a schematic diagram of the side cutting of the nut. Figure 7B This is a schematic diagram of the mesh division on the side of the nut; Fig. 8A The bolt and nut segmentation model is: Figure 8B It is the mesh model of bolt and nut.

[0087] In step 105 , the five parts of the bolt model and the three parts of the nut model are bonded respectively.

[0088] After completing the construction of the five-part model of the bolt and the three-part model of the nut, use the vglue command to glue the five parts into an associated bolt as a whole, and use the same method to obtain the overall nut model.

[0089] The present invention relates to a finite element parametric modeling method for a bolt and nut connection. The method is based on ANSYS finite element software, and achieves more accurate simulation calculations by segmenting and refining the bolt and nut connection model. Specifically, the present invention first sets the key geometric parameters and material properties of the bolt and nut model in the finite element software, and then decomposes the bolt and nut into multiple parts for modeling. Then, meshing is performed for different parts, and tetrahedral meshes are used to connect the area between the thread and the main body to optimize the accuracy and efficiency of the simulation calculation. Finally, boundary conditions are applied to the mathematical model or nodes to perform bolt connection simulation calculations. The present invention optimizes the meshing quality of the bolt model and can obtain more accurate analysis results.

[0090] It should be understood that the order of execution of the steps in the above embodiment does not necessarily 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 embodiment of the present invention.

[0091] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0092] Fig. 9 : is a schematic diagram of the structure of a finite element parametric modeling device for a bolt and nut connection provided by an embodiment of the present invention. For the sake of convenience, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0093] Reference Fig. 9 A finite element parametric modeling device 9 for a bolt and nut connection includes: an acquisition module 91, a construction module 92, a cutting module 93 and a bonding module 94.

[0094] An acquisition module 91 is used to acquire parameters of the bolt model and the nut model, the parameters including geometric dimensions and material properties;

[0095] A construction module 92 is used to construct five parts of the bolt model, namely, a screw middle cuboid, a screw hollow cylinder, a bolt head hollow hexahedron, a screw and thread body connection section, and a bolt thread body, based on the parameters of the bolt model;

[0096] The construction module 92 is also used to construct the three parts of the nut model, namely, the nut hollow hexahedron, the connecting section between the nut hexahedron and the threaded body, and the nut threaded body, based on the parameters of the nut model;

[0097] The segmentation module 93 is used to segment the other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body into polyhedrons, and divide them by mapping; and divide the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body by free segmentation;

[0098] The bonding module 94 is used to bond the five parts of the bolt model and the three parts of the nut model respectively.

[0099] In some embodiments, the acquisition module 91 is used to obtain the nominal diameter d of the bolt, the length l of the screw, the length b of the thread segment, the thread pitch p, the tooth angle α, the thread minor diameter d1, the thread median diameter d2, the bolt head inscribed circle diameter smax, the bolt head thickness kgc and the nut thickness m.

[0100] In some embodiments, the acquisition module 91 is also used to acquire material properties such as elastic modulus, density, Poisson's ratio, friction coefficient and constitutive relationship.

[0101] In some embodiments, when the construction module 92 constructs the bolt thread body L5, first, a first helix is ​​generated by a loop according to specific parameters of the bolt. Then, the shape of the thread tooth section is drawn at the end of the first helix. Finally, the bolt thread body L5 is generated by using the first helix to drag the thread tooth section.

[0102] In some embodiments, the dividing module 93 divides the other parts except the screw and threaded body connecting section L4, the nut hexahedron and the threaded body connecting section M2 into hexahedrons respectively using the following formula:

[0103]

[0104] Where y1 and y2 are the mesh side lengths during mesh division, and y is equal to 1 / 2 of the nominal bolt diameter.

[0105] In some embodiments, the bonding module 94 uses the vglue command to bond the five parts into an associated bolt body, and uses the same method to obtain the overall nut model.

[0106] Fig.10 Schematic diagram of an electronic device provided by an embodiment of the present invention. Fig.10 As shown, the electronic device 10 of this embodiment includes: a processor 100, a memory 101, and a computer program 102 stored in the memory 101 and executable on the processor 100. When the processor 100 executes the computer program 102, the steps in each of the above-mentioned embodiments of the finite element parametric modeling method for bolt and nut connectors are implemented, for example Figure 1 Alternatively, when the processor 100 executes the computer program 102, the functions of each module in the above-mentioned device embodiments are realized, for example, Fig. 9 The functions of modules 91 to 94 are shown.

[0107] Exemplarily, the computer program 102 may be divided into one or more modules, which are stored in the memory 101 and executed by the processor 100 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments that can implement specific functions, and the instruction segments are used to describe the execution process of the computer program 102 in the electronic device 10. For example, the computer program 102 may be divided into Fig. 9 Modules 91 to 94 are shown.

[0108] The electronic device 10 may be a computing device such as a desktop computer or a notebook. The electronic device 10 may include, but is not limited to, a processor 100 and a memory 101. Those skilled in the art will appreciate that Fig.10 It is only an example of the electronic device 10 and does not constitute a limitation of the electronic device 10. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0109] The processor 100 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0110] The memory 101 may be an internal storage unit of the electronic device 10, such as a hard disk or memory of the electronic device 10. The memory 101 may also be an external storage device of the electronic device 10, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 10. Further, the memory 101 may also include both an internal storage unit of the electronic device 10 and an external storage device. The memory 101 is used to store the computer program and other programs and data required by the electronic device. The memory 101 may also be used to temporarily store data that has been output or is to be output.

[0111] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0112] 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.

[0113] Those of ordinary skill in the art will appreciate that the 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.

[0114] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0115] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0116] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0117] If the integrated 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, the steps of the above-mentioned various embodiments of the finite element parametric modeling method of bolt and nut connectors can be implemented. 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 (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0118] 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 finite element parametric modeling method for bolt and nut connections, characterized in that: include: Acquire parameters of the bolt model and the nut model, wherein the parameters include geometric dimensions and material properties; Based on the parameters of the bolt model, five parts of the bolt model are constructed, namely, a screw middle cuboid, a screw hollow cylinder, a bolt head hollow hexahedron, a screw and thread body connection section, and a bolt thread body; Based on the parameters of the nut model, three parts of the nut model are constructed: a nut hollow regular hexahedron, a nut hexahedron and a threaded body connection section, and a nut threaded body; The other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are respectively cut into polyhedrons, and the division is performed by mapping; the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body are divided by free division; The five parts of the bolt model and the three parts of the nut model are bonded respectively.

2. A finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The intermediate cuboid of the screw is a cuboid with a square cross section inside the screw cylinder, the center of the square coincides with the center of the cross section of the screw cylinder, and the length of the intermediate cuboid of the screw is equal to the length of the bolt; The hollow screw cylinder is the part of the screw cylinder without the middle cuboid and the threaded cylinder of the screw; The hollow hexahedron of the bolt head is the portion of the bolt head minus the cylinder of the screw rod; The connecting section between the screw and the threaded body is the part of the threaded cylinder without threads; The bolt thread body is the thread of the bolt.

3. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The nut thread body is the thread of the nut; The connecting section between the nut hexahedron and the threaded body is a circular ring that wraps around the outside of the nut threaded body; The hollow regular hexahedron of the nut is the portion of the nut obtained by removing the nut threaded body and the connecting section between the nut hexahedron and the threaded body.

4. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The geometric dimensions include the nominal diameter of the bolt, the length of the screw rod, the length of the thread segment, the thread pitch, the tooth angle, the thread minor diameter, the thread median diameter, the bolt head inscribed circle diameter, the bolt head thickness and the nut thickness.

5. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The material properties include elastic modulus, density, Poisson's ratio, friction coefficient, and constitutive relations.

6. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The other parts except the connecting section between the screw and the threaded body, the hexahedron of the nut and the connecting section of the threaded body are cut into polyhedrons respectively, including: The following formula is used to cut the other parts except the connecting section between the screw and the threaded body, the nut hexahedron and the connecting section between the threaded body into polyhedrons: Wherein, y1 and y2 are the mesh side lengths during mesh division, and y is equal to 1 / 2 of the nominal diameter of the bolt.

7. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The method for constructing the bolt thread body is to generate a first helix according to the parameters of the bolt model, generate a first thread tooth section at the end of the first helix, and generate the bolt thread body based on the first thread tooth section.

8. The finite element parametric modeling method for bolt and nut connectors according to claim 1, characterized in that: The method for constructing the nut thread body is to generate a second helix according to the parameters of the nut model, generate a second thread tooth section at the end of the second helix, and generate the nut thread body based on the second thread tooth section.

9. A finite element parametric modeling device for bolt and nut connectors, characterized in that: include: An acquisition module, used for acquiring parameters of the bolt model and the nut model, wherein the parameters include geometric dimensions and material properties; A construction module, used to construct five parts of the bolt model, namely, a screw middle cuboid, a screw hollow cylinder, a bolt head hollow hexahedron, a screw and thread body connection section, and a bolt thread body, based on the parameters of the bolt model; The construction module is also used to construct the three parts of the nut model, namely, the nut hollow regular hexahedron, the nut hexahedron and the threaded body connection section, and the nut threaded body, based on the parameters of the nut model; A segmentation module is used to segment the other parts except the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body into polyhedrons, and divide them by mapping; and divide the connecting section between the screw and the threaded body, and the connecting section between the nut hexahedron and the threaded body by free segmentation; The bonding module is used to bond the five parts of the bolt model and the three parts of the nut model respectively.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for finite element parametric modeling of bolt and nut connections as described in any one of claims 1 to 8 are implemented.

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