Bolt checking method and device, electronic equipment and readable storage medium

Abstract

The invention provides a bolt checking method and device, electronic equipment and a readable storage medium, and the method comprises the steps: building a multi-bolt connection model, and determining the contact relation between each bolt and a connecting piece in the model; performing finite element simulation calculation on the model based on the thread parameter of each bolt in the model and a gap contact algorithm to obtain a target stress parameter of each bolt; for any target bolt, determining the working load of the target bolt based on the corresponding target stress parameter and a single-cylinder bolt checking algorithm; based on the bolt material and the bolt size parameter of the target bolt and the preset material allowable value of the bolt connection parameter corresponding to the bolt material, whether the bolt connection parameter of the target bolt meets the design requirement under the working load condition or not is judged; if not, it is determined that the target bolt is redesigned. Therefore, finite element simulation is carried out on bolt connection through the gap contact algorithm, the accurate bolt working load can be obtained, and then the bolt checking accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of bolt design, and in particular to a bolt verification method, device, electronic device and readable storage medium. Background Art

[0002] Bolted connection is a common structural connection form and is widely used in industries such as machinery and electricity. Bolt verification can verify the safety of bolted connections and prevent structural damage or catastrophic accidents caused by bolt failure, which is crucial to protecting the integrity and safety of equipment.

[0003] Existing methods of simulating bolt connection relationships by establishing a solid thread model or using an equivalent coupled contact simplified model cannot accurately simulate the meshing state of the thread. They can only roughly analyze the stress distribution of the bolt screw and are difficult to effectively analyze the stress state of the bolt thread, resulting in low accuracy in determining the bolt working load and inaccurate bolt calibration. Summary of the invention

[0004] In view of this, the embodiments of the present application provide at least a bolt calibration method, device, electronic device and readable storage medium. By performing finite element simulation on the bolt connection through the gap contact algorithm, accurate bolt working load can be obtained, thereby improving the accuracy of bolt calibration.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a bolt calibration method, the method comprising:

[0007] A multi-bolt connection model is established, and the contact relationship between each bolt, the first connection member corresponding to each bolt, and the second connection member in the multi-bolt connection model is determined; any bolt is in small slip contact with the corresponding first connection member through a flange gasket, and is in small slip contact with the corresponding second connection member through a threaded meshing gap; any first connection member is in small slip contact with the corresponding second connection member;

[0008] Based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, a finite element simulation calculation is performed on the multi-bolt connection model to obtain target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt;

[0009] For any target bolt in the multi-bolt connection model, the working load of the target bolt is determined based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable value of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition;

[0010] If not, it is determined to redesign the target bolt.

[0011] In a second aspect, an embodiment of the present application further provides a bolt calibration device, the bolt calibration device comprising:

[0012] A modeling module is used to establish a multi-bolt connection model and determine the contact relationship between each bolt and the first connection member and the second connection member corresponding to each bolt in the multi-bolt connection model; any bolt is in small slip contact with the corresponding first connection member through a flange gasket and is in small slip contact with the corresponding second connection member through a threaded meshing gap; any first connection member is in small slip contact with the corresponding second connection member;

[0013] a calculation module, configured to perform finite element simulation calculation on the multi-bolt connection model based on thread parameters of each bolt in the multi-bolt connection model and a gap contact algorithm, so as to obtain target force parameters corresponding to each bolt; the target force parameters include axial force, first lateral force, second lateral force and axial force moment of the bolt;

[0014] A judgment module is used to determine the working load of any target bolt in the multi-bolt connection model based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and to judge whether the bolt connection parameters of the target bolt under the working load meet the design requirements based on the bolt material and bolt size parameters of the target bolt and the preset material allowable value of the bolt connection parameters corresponding to the bolt material;

[0015] The determination module is used for determining whether or not to redesign the target bolt.

[0016] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the bolt verification method as described above.

[0017] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the bolt verification method as described above are executed.

[0018] The embodiments of the present application provide a bolt verification method, device, electronic device and readable storage medium, wherein the method comprises: establishing a multi-bolt connection model, and determining the contact relationship between each bolt, the first connecting member and the second connecting member corresponding to each bolt in the multi-bolt connection model; any bolt is in small slip contact with the corresponding first connecting member through a flange gasket, and is in small slip contact with the corresponding second connecting member through a threaded meshing gap; any first connecting member is in small slip contact with the corresponding second connecting member; based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, the multi-bolt connection model is simulated and calculated by finite element to obtain the target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt; for any target bolt in the multi-bolt connection model, based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm, the working load of the target bolt is determined; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable value of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt meet the design requirements under the working load conditions; if not, it is determined to redesign the target bolt. In this way, the finite element simulation of the bolt connection through the gap contact algorithm can obtain the accurate bolt working load, thereby improving the accuracy of the bolt verification.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A flow chart of a bolt checking method provided in an embodiment of the present application is shown;

[0022] Figure 2 A structural schematic diagram showing the contact relationship between any target bolt and the corresponding first connecting member and second connecting member in the multi-bolt connection model in the embodiment of the present application;

[0023] Figure 3 A load-deformation line graph of a concentrically loaded bolt without considering the loss of preload force in an embodiment of the present application is shown;

[0024] Figure 4 A functional module diagram of a bolt checking device provided in an embodiment of the present application is shown;

[0025] Figure 5 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown.

[0026] Description of main component symbols:

[0027] In the figure: 110-target bolt; 120-first connecting member; 130-second connecting member; 140-flange gasket; 111-bolt head; 112-bolt screw; 113-bolt thread; 131-second connecting member thread; 400-bolt calibration device; 410-modeling module; 420-calculation module; 430-judgment module; 440-determination module; 500-electronic device; 510-processor; 520-memory; 530-bus. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] To facilitate the understanding of the present application, the technical solution provided by the present application is described in detail below in conjunction with specific embodiments.

[0030] The embodiments of the present application provide a bolt calibration method, device, electronic device and readable storage medium. By performing finite element simulation on the bolt connection through a gap contact algorithm, an accurate bolt working load can be obtained, thereby improving the accuracy of bolt calibration.

[0031] See also Figure 1 , Figure 1 This is a flow chart of a bolt calibration method provided in an embodiment of the present application. Figure 1 As shown, the bolt calibration method provided in the embodiment of the present application includes the following steps:

[0032] S101, establish a multi-bolt connection model, and determine the contact relationship between each bolt, the first connecting member corresponding to each bolt, and the second connecting member in the multi-bolt connection model; any bolt is in small sliding contact with the corresponding first connecting member through a flange gasket, and is in small sliding contact with the corresponding second connecting member through a threaded engagement gap; any first connecting member is in small sliding contact with the corresponding second connecting member.

[0033] Here, the existing bolt modeling methods mainly simulate the meshing state of the bolt thread by establishing a solid thread model and making small sliding contact between the internal and external threads or by coupling the equivalent rigid body element (RBE) unit or by tie contact (TIE). However, the method of establishing a solid thread model requires a lot of time in model pre-processing, the model is not easy to converge, and stress singularity is prone to occur at the thread meshing point; the equivalent RBE unit coupling contact method can simplify the model, save a lot of calculation costs, and is easier to converge, but the connection stiffness of the connector is increased due to the coupling connection method, and the equivalent RBE unit gives the connection tensile stiffness attribute; although TIE contact is easy to model and has good convergence, the stiffness of the bolt connection is significantly enhanced and the thread stress field is singular. The above three methods cannot accurately simulate the meshing state of the thread, and can only roughly analyze the stress distribution of the screw, but it is difficult to effectively analyze the stress state of the thread, and it requires a lot of engineering practice to determine the index value of bolt failure by stress value, resulting in low accuracy in determining the working load of the bolt and inaccurate bolt verification.

[0034] Based on the fact that the existing general engineering simulation methods cannot effectively analyze the stress state of the thread, the embodiment of the present application simulates the meshing state of the bolt thread through the gap contact algorithm to extract the load of a single bolt in a complex assembly. First, a multi-bolt connection model is established, and the contact relationship between each bolt and the first connecting member and the second connecting member corresponding to each bolt in the multi-bolt connection model is determined. Specifically, taking any target bolt in the multi-bolt connection model as an example, refer to Figure 2 , Figure 2 Schematic diagram of the contact relationship between any target bolt and the corresponding first and second connecting members in the multi-bolt connection model in the embodiment of the present application. Figure 2As shown, the target bolt 110 includes a bolt head 111, a bolt screw 112 and a bolt thread 113, which are an integrated structure; the target bolt 110 is used to fix the corresponding first connecting member 120 and the second connecting member 130 together, wherein the first connecting member 120 can be one connecting member or multiple connecting members, and no specific limitation is made here; the lower end face of the bolt head 111 of the target bolt 110 is in small sliding contact with the upper end face of the first connecting member 120 through the flange gasket 140; the lower end face of the first connecting member 120 is in small sliding contact with the upper end face of the second connecting member 130; the bolt thread 113 of the target bolt 110 is in contact with the second connecting member thread 131 of the second connecting member 130 through a thread engagement clearance to simulate thread engagement.

[0035] S102, based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, perform finite element simulation calculation on the multi-bolt connection model to obtain target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt.

[0036] Here, after the model and contact relationship are established, based on the thread parameters and gap contact algorithm of each bolt in the multi-bolt connection model, the finite element simulation calculation of the multi-bolt connection model is performed through the finite element analysis software ABAQUS to obtain the target force parameters corresponding to each bolt; wherein, the target force parameters include the six-direction axial force and moment of the bolt extracted from the stress field of the bolt based on the six-component force, specifically including the axial force F S , the first lateral force F S1 , the second lateral force F S2 and axial force moment M S .

[0037] In the embodiment of the present application, the multi-bolt connection model is simulated and calculated by finite element analysis (FEA). Among them, the setting of the gap contact algorithm is very critical. The gap contact algorithm is based on the small slip contact algorithm for solution calculation. Taking any target bolt 110 in the multi-bolt connection model as an example, the master-slave surface relationship between the bolt thread 113 and the second connector thread 131 is first determined, and then the small slip contact pair is determined by setting the contact properties of the normal surface and the tangential surface. Since the gap contact algorithm takes into account the situation where there is a gap between the contacting objects, for the bolt connection structure, it can simulate the small gap that may exist between the bolt and the connector.

[0038] Specifically, when setting the finite element model, a contact pair should be defined. For a bolt connection, the bolt thread 113 and the second connector thread 131 are set as a contact pair. The algorithm calculates the contact force by judging the contact state. During the bolt tightening process or when subjected to an external load, the finite element software will calculate the mechanical quantities such as pressure and friction on the contact surface according to the rules of the gap contact algorithm according to the presence or absence of a gap and the change of the contact state. If the bolt is subjected to tension, when the tension is large enough, the contact state may change from a gap to a close contact, and the software will recalculate the mechanical response according to the contact conditions. Since it is difficult to achieve a completely ideal tight fit in an actual bolt connection structure, there is often a certain assembly gap. Therefore, the use of a gap contact algorithm can more realistically reflect this actual situation, so that the analysis results are closer to the mechanical properties of the bolt in actual use, thereby improving the accuracy of the analysis. Compared with the contact model that does not consider the gap, the gap contact algorithm can more accurately predict the stress distribution and deformation of the bolt connection structure under different loads. For example, in a vibration environment, due to the presence of a gap, the bolt connection may become loose, and this contact algorithm helps to analyze such situations. By analyzing the finite element model of bolted connections with gap contact, we can provide a basis for designing reasonable bolt dimensions, tolerances, and preload forces, help optimize bolt connection design, and avoid connection failures caused by gap problems.

[0039] S103, for any target bolt in the multi-bolt connection model, determine the working load of the target bolt based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable values ​​of the bolt connection parameters corresponding to the bolt material, judge whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition.

[0040] Here, for any target bolt 110 in the multi-bolt connection model, the working load of the target bolt 110 is determined based on the target force parameters corresponding to the target bolt 110 and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt 110, as well as the preset material allowable values ​​of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt 110 meet the design requirements under the working load conditions.

[0041] In the embodiment of the present application, the single cylindrical bolt calibration algorithm is a single cylindrical bolt calibration calculation program compiled according to the VDI2230 standard (Verein Deutscher Ingenieure, VDI), which converts the target force parameter corresponding to the target bolt 110, that is, the axial force F of the target bolt 110 S , the first lateral force F S1, the second lateral force F S2 and axial force moment M S By inputting the single cylindrical bolt verification algorithm, the working load of the target bolt 110 can be calculated. The working load of the target bolt 110, the bolt material and bolt size parameters of the target bolt 110, and the preset material allowable value of the bolt connection parameter corresponding to the bolt material are input into the single cylindrical bolt verification algorithm to determine whether the bolt connection parameters of the target bolt 110 meet the design requirements under the working load condition. Among them, the preset material allowable value of the bolt connection parameter corresponding to the bolt material is input according to the reference atlas and the standard, and no specific limitation is made here.

[0042] S104: If not, determine to redesign the target bolt.

[0043] Here, if the single cylindrical bolt verification algorithm verifies that the bolt connection parameters of the target bolt 110 under the working load condition do not meet the design requirements, then it is determined to redesign the target bolt 110. Specifically, the bolt connection structure and the bolt material are re-optimized, and after the redesign, the verification steps S101 to S103 are repeated until the bolt connection parameters of the target bolt 110 meet the design requirements.

[0044] Further, the multi-bolt connection model is established according to the following steps:

[0045] Step a1, based on the three-dimensional geometric model of a complex assembly consisting of multiple bolts, first connecting parts corresponding to the multiple bolts, and second connecting parts, finite element modeling is performed on the complex assembly, and material properties are assigned to the multiple bolts, first connecting parts corresponding to the multiple bolts, and second connecting parts.

[0046] Here, first, a three-dimensional geometric model of a complex assembly consisting of multiple bolts, first connecting parts corresponding to the multiple bolts, and second connecting parts is imported into finite element software for meshing, and finite element modeling is performed on the complex assembly; then, material properties of the multiple bolts, first connecting parts corresponding to the multiple bolts, and second connecting parts are set, including density, Young's modulus, Poisson's ratio and other material properties.

[0047] Step a2, setting the screw preload of the multiple bolts and the working loads and boundary constraints of the first connecting parts and the second connecting parts corresponding to the multiple bolts to obtain the multi-bolt connection model.

[0048] Here, after setting the screw preload of multiple bolts, and the working load and boundary constraints of the first and second connectors corresponding to the multiple bolts, a multi-bolt connection model is obtained. Among them, the screw preload is set according to the actual situation of the bolt installation, and no specific restrictions are made here; the working load of the first and second connectors is set according to the actual situation of the bolt installation, and no specific restrictions are made here; the boundary constraint condition of the second connector is to fix the end face boundary of the second connector.

[0049] Furthermore, the thread parameters of each bolt in the multi-bolt connection model include thread pitch, bolt nominal diameter, thread flank angle, thread vector direction, thread engagement direction, and gap contact active surface and driven surface point set; based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, the multi-bolt connection model is subjected to finite element simulation calculation to obtain the target force parameters corresponding to each bolt, including:

[0050] Step b1, determining the overall connection stiffness between each bolt and the corresponding second connecting member based on the thread pitch, the nominal diameter of the bolt and the thread flank angle.

[0051] Here, taking the target bolt 110 as an example, determining the gap contact parameters requires setting the thread pitch, bolt nominal diameter, thread flank angle, thread vector direction, thread engagement direction, and gap contact active and passive surface point sets of the target bolt 110. Among them, the overall connection stiffness is used to control the relationship between force and displacement on the contact surface. If the overall connection stiffness value is set too large, it may lead to convergence difficulties, because a small fluctuation in the value during the calculation process will cause a huge change in the contact force, and if it is set too small, it cannot accurately simulate the contact behavior. Its value is usually estimated based on the material properties such as Young's modulus and Poisson's ratio of the material and the geometric shape of the contact object, and it may need to be adjusted to a suitable value after multiple trial calculations. In the embodiment of the present application, the overall connection stiffness between each bolt and the corresponding second connector is determined by the thread pitch, bolt nominal diameter and thread flank angle.

[0052] Step b2, determining the local stiffness of the bolt thread of each bolt based on the thread vector direction, the thread engagement direction and the point set of the active surface and the driven surface of the clearance contact.

[0053] Here, the thread vector direction, the thread engagement direction, and the gap contact active and driven surface point sets determine the local stiffness of the bolt thread of each bolt, improving the accuracy of the gap contact algorithm.

[0054] Step b3, based on the overall connection stiffness between each bolt and the corresponding second connecting member, the local stiffness of the bolt thread of each bolt and the preset target gap contact friction coefficient, finite element simulation calculation is performed on the multi-bolt connection model through a gap contact algorithm to obtain the target force parameters corresponding to each bolt; the preset target gap contact friction coefficient is the gap contact friction coefficient determined according to the material properties of each bolt and the corresponding second connecting member.

[0055] Here, the gap contact friction coefficient is another important gap contact parameter. In bolted connections, the gap contact friction coefficient affects the transmission of the screw preload and the stability of the connection. Here, the preset target gap base friction coefficient is the gap base friction coefficient determined according to the material properties of each bolt and the corresponding second connector. Specifically, the value of the friction coefficient varies depending on the material combination of the bolt and the connector. For example, for a steel-steel connection, the friction coefficient is generally between 0.1 and 0.2; if it is a steel-aluminum connection, the friction coefficient may vary. At the same time, there is also a choice of contact type. In the gap contact algorithm, common contact types include surface-to-surface contact, point-to-surface contact, etc. For bolted connections, surface-to-surface contact is generally used to simulate the contact between the bolt and the connector. This contact type can better handle the stress distribution on the contact surface, especially when subjected to large loads, and can more accurately calculate the deformation and stress of the contact area.

[0056] In an embodiment of the present application, based on the overall connection stiffness between each bolt and the corresponding second connecting member, the local stiffness of the bolt thread of each bolt and the preset target gap contact friction coefficient, a finite element simulation calculation is performed on the multi-bolt connection model through a gap contact algorithm to obtain the target force parameters corresponding to each bolt.

[0057] Further, the working load of the target bolt is determined based on the target force parameter corresponding to the target bolt and the single cylindrical bolt verification algorithm, including:

[0058] Step c1, obtaining the bolt load and deformation relationship line in the single cylindrical bolt verification algorithm; the bolt load and deformation relationship line is used to represent the mapping relationship between the bolt axial force and the bolt deformation amount and the mapping relationship between the clamping force of the connector and the connector deformation amount.

[0059] Here, the bolt load and deformation relationship line in the single cylindrical bolt verification algorithm is obtained. For details, please refer to Figure 3 , Figure 3 This is a load deformation line diagram of a concentrically loaded bolt without considering the loss of preload force in the embodiment of the present application. Figure 3 As shown, Figure 3 The bolt load and deformation relationship line is used to represent the axial force F of the bolt SThe mapping relationship between the bolt deformation and the clamping force F of the connection KR The mapping relationship between the deformation of the connector and the deformation of the connector.

[0060] Step c2, determining the working load of the target bolt based on the target force parameter and the bolt load and deformation relationship line.

[0061] Here, the bolt axial force F is calculated by the bolt load and deformation relationship line. S The mapping relationship between the bolt deformation and the clamping force F of the connection KR The mapping relationship between the deformation of the connection part and the working load of the target bolt is calculated according to the target force parameters.

[0062] Further, the working load of the target bolt includes an axial working load, a lateral working load and an axial working torque load; and determining the working load of the target bolt based on the target force parameter and the bolt load and deformation relationship line includes:

[0063] Step d1, determining the bolt flexibility of the target bolt and the connection flexibility of the second connection member corresponding to the target bolt according to the bolt load and deformation relationship line;

[0064] Here, if Figure 3 As shown, according to the relationship line between the bolt load and the deformation, the bolt flexibility of the target bolt 110 and the connection flexibility of the second connection member 130 are determined. Specifically, the bolt axial force F is calculated. S The slope of the mapping relationship curve between the bolt deformation amount and the bolt stiffness of the target bolt 110 is obtained, and the reciprocal of the bolt stiffness is determined as the bolt flexibility δ of the target bolt 110. S ; Similarly, calculate the clamping force F of the connector KR The slope of the mapping relationship curve between the deformation amount of the connecting member and the connecting member is used to obtain the connecting member stiffness of the second connecting member 130, and the reciprocal of the connecting member stiffness is determined as the connecting member flexibility δ of the second connecting member 130. P .

[0065] Step d2, determining the axial working load of the target bolt according to the axial force of the target bolt, the bolt flexibility of the target bolt, the connection flexibility of the second connection member and the screw preload.

[0066] Here, according to the axial force F of the target bolt 110 S 、 Bolt flexibility δ of target bolt 110 S , the connection flexibility δ of the second connection member 130 P And the screw preload F V , determine the axial working load F of the target bolt 110 AThe specific formula is The formula derivation process is:

[0067]

[0068] Step d3, determining the lateral working load of the target bolt according to the first lateral force and the second lateral force of the target bolt.

[0069] Here, according to the first lateral force F of the target bolt 110 S1 and the second lateral force F S2 , determine the lateral working load F of the target bolt 110 Q The specific formula is

[0070] Step d4, determining the axial force moment of the target bolt as the axial working torque load of the target bolt.

[0071] Here, the axial force moment M of the target bolt 110 is S The axial working torque load M of the target bolt 110 is determined as Y .

[0072] Further, judging whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition based on the bolt material and bolt size parameters of the target bolt and the preset material allowable value of the bolt connection parameters corresponding to the bolt material includes:

[0073] Step e1, determining the true value of the bolt connection parameter of the target bolt according to the working load of the target bolt, the bolt material and the bolt size parameters of the target bolt through a single cylindrical bolt verification algorithm.

[0074] Here, the calculated working load of the target bolt 110, that is, the axial working load F A , lateral working load F Q and axial working torque load M Y , and the bolt material and bolt size parameters of the target bolt 110 are input into the single cylindrical bolt connection verification algorithm to calculate the true values ​​of the bolt connection parameters of the target bolt 110.

[0075] Step e2, determining the ratio of the preset material allowable value of the bolt connection parameter corresponding to the bolt material to the actual value of the corresponding bolt connection parameter of the target bolt as the index value of multiple target safety factors corresponding to the target bolt.

[0076] Here, the single cylindrical bolt connection verification algorithm is used to calculate the ratio of the preset material allowable value of the bolt connection parameter corresponding to each bolt material and the actual value of the bolt connection parameter of the corresponding target bolt, and obtain the index values ​​of multiple target safety factors corresponding to the target bolt.

[0077] Step e3: if the index values ​​of the target safety factors are all within the corresponding preset safety factor index value range, it is determined that the target bolt meets the design requirements under the working load condition.

[0078] Here, as shown in the following Table 1, Table 1 is a target safety factor index value range table. As shown in Table 1, if the index values ​​of each target safety factor are within the corresponding preset safety factor index value range, it is determined that the target bolt meets the design requirements under the working load condition.

[0079] Table 1 Target safety factor index value range

[0080]

[0081] Step e4: if any index value of the target safety factor is not within the corresponding preset safety factor index value range, it is determined that the target bolt does not meet the design requirements under the working load condition.

[0082] Here, as shown in Table 1, if the index value of any target safety factor is not within the corresponding preset safety factor index value range, it is determined that the target bolt does not meet the design requirements under the working load condition.

[0083] Furthermore, the target safety factor includes the bolt size safety factor, the tightening torque safety factor, the ultimate strength safety factor under the working load, the fatigue failure safety factor, the surface pressure safety factor, the slip safety factor, the shear safety factor and the thread engagement safety factor.

[0084] Here, as shown in Table 1, the target safety factors include bolt size safety factor SFc, tightening torque safety factor Sn, ultimate strength safety factor SF under working load, fatigue failure safety factor SD, surface pressure safety factor Sp, slip safety factor SG, shear safety factor SA and thread engagement safety factor Seff.

[0085] A bolt verification method provided in an embodiment of the present application includes: establishing a multi-bolt connection model, and determining the contact relationship between each bolt, a first connection member and a second connection member corresponding to each bolt in the multi-bolt connection model; any bolt is in small slip contact with the corresponding first connection member through a flange gasket, and is in small slip contact with the corresponding second connection member through a thread engagement gap; any first connection member is in small slip contact with the corresponding second connection member; based on the thread parameters of each bolt in the multi-bolt connection model and a gap contact algorithm, a finite element simulation calculation is performed on the multi-bolt connection model to obtain target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt; for any target bolt in the multi-bolt connection model, based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm, the working load of the target bolt is determined; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable value of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition; if not, it is determined to redesign the target bolt. In this way, the finite element simulation of the bolt connection through the gap contact algorithm can obtain the accurate bolt working load, thereby improving the accuracy of the bolt verification.

[0086] Based on the same application concept, the embodiments of the present application also provide a bolt calibration device corresponding to the bolt calibration method provided in the above embodiments. Since the principle of solving the problem by the bolt calibration device in the embodiments of the present application is similar to that of the bolt calibration method in the above embodiments of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0087] See also Figure 4 , Figure 4 This is a functional module diagram of a bolt calibration device provided in an embodiment of the present application. Figure 4 As shown, the bolt checking device 400 includes:

[0088] Modeling module 410 is used to establish a multi-bolt connection model and determine the contact relationship between each bolt, the first connecting member corresponding to each bolt, and the second connecting member in the multi-bolt connection model; any bolt is in small sliding contact with the corresponding first connecting member through a flange gasket, and is in small sliding contact with the corresponding second connecting member through a threaded engagement gap; any first connecting member is in small sliding contact with the corresponding second connecting member.

[0089] The calculation module 420 is used to perform finite element simulation calculation on the multi-bolt connection model based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm to obtain the target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt.

[0090] The judgment module 430 is used to determine the working load of any target bolt in the multi-bolt connection model based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable values ​​of the bolt connection parameters corresponding to the bolt material, to judge whether the bolt connection parameters of the target bolt under the working load meet the design requirements.

[0091] The determination module 440 is used to determine whether to redesign the target bolt if no.

[0092] Furthermore, when the modeling module 410 is used to establish a multi-bolt connection model, the modeling module 410 is specifically used to:

[0093] Based on a three-dimensional geometric model of a complex assembly consisting of a plurality of bolts, first connecting members and second connecting members corresponding to the plurality of bolts, finite element modeling is performed on the complex assembly, and material properties are assigned to the plurality of bolts, first connecting members and second connecting members corresponding to the plurality of bolts;

[0094] The screw pre-tightening force of the multiple bolts and the working loads and boundary constraints of the first connecting member and the second connecting member corresponding to the multiple bolts are set to obtain the multi-bolt connection model.

[0095] Further, the thread parameters of each bolt in the multi-bolt connection model include thread pitch, bolt nominal diameter, thread flank angle, thread vector direction, thread engagement direction, and gap contact active surface and driven surface point set; when the calculation module 420 is used to perform finite element simulation calculation on the multi-bolt connection model based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm to obtain the target force parameters corresponding to each bolt, the calculation module 420 is specifically used to:

[0096] Determining the overall connection stiffness between each bolt and the corresponding second connecting member based on the thread pitch, the bolt nominal diameter and the thread flank angle;

[0097] Determine the local stiffness of the bolt thread of each bolt based on the thread vector direction, the thread engagement direction and the point set of the active surface and the driven surface of the clearance contact;

[0098] According to the overall connection stiffness between each bolt and the corresponding second connecting member, the local stiffness of the bolt thread of each bolt and the preset target gap contact friction coefficient, a finite element simulation calculation is performed on the multi-bolt connection model through a gap contact algorithm to obtain the target force parameters corresponding to each bolt; the preset target gap contact friction coefficient is the gap contact friction coefficient determined according to the material properties of each bolt and the corresponding second connecting member.

[0099] Further, when the judgment module 430 is used to determine the working load of the target bolt based on the target force parameter corresponding to the target bolt and the single cylindrical bolt verification algorithm, the judgment module 430 is specifically used to:

[0100] Obtaining a bolt load and deformation relationship line in a single cylindrical bolt verification algorithm; the bolt load and deformation relationship line is used to represent a mapping relationship between the axial force of the bolt and the bolt deformation amount, and a mapping relationship between the clamping force of the connector and the connector deformation amount;

[0101] Based on the target force parameter and the bolt load-deformation relationship line, the working load of the target bolt is determined.

[0102] Further, the working load of the target bolt includes an axial working load, a lateral working load and an axial working torque load; when the judgment module 430 is used to determine the working load of the target bolt based on the target force parameter and the bolt load and deformation relationship line, the judgment module 430 is specifically used to:

[0103] Determining, according to the bolt load-deformation relationship line, the bolt flexibility of the target bolt and the connection flexibility of the second connection member corresponding to the target bolt;

[0104] Determining the axial working load of the target bolt according to the axial force of the target bolt, the bolt flexibility of the target bolt, the connection flexibility of the second connection member, and the screw preload;

[0105] Determining a lateral working load of the target bolt according to a first lateral force and a second lateral force of the target bolt;

[0106] The axial force moment of the target bolt is determined as the axial working torque load of the target bolt.

[0107] Further, when the judgment module 430 is used to judge whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition based on the bolt material and bolt size parameters of the target bolt and the preset material allowable value of the bolt connection parameter corresponding to the bolt material, the judgment module 430 is specifically used to:

[0108] According to the working load of the target bolt, the bolt material and the bolt size parameters of the target bolt, the real value of the bolt connection parameter of the target bolt is determined by a single cylindrical bolt verification algorithm;

[0109] Determine the ratio of the preset material allowable value of the bolt connection parameter corresponding to the bolt material to the corresponding true value of the bolt connection parameter of the target bolt as the index value of multiple target safety factors corresponding to the target bolt;

[0110] If the index values ​​of the target safety factors are all within the corresponding preset safety factor index value range, it is determined that the target bolt meets the design requirements under the working load condition;

[0111] If the index value of any of the target safety factors is not within the corresponding preset safety factor index value range, it is determined that the target bolt does not meet the design requirements under the working load condition.

[0112] Furthermore, the target safety factor includes the bolt size safety factor, the tightening torque safety factor, the ultimate strength safety factor under the working load, the fatigue failure safety factor, the surface pressure safety factor, the slip safety factor, the shear safety factor and the thread engagement safety factor.

[0113] The bolt checking device provided in the embodiment of the present application includes: a modeling module, which is used to establish a multi-bolt connection model and determine the contact relationship between each bolt and the first connecting member and the second connecting member corresponding to each bolt in the multi-bolt connection model; any bolt is in small sliding contact with the corresponding first connecting member through a flange gasket, and is in contact with the corresponding second connecting member through a threaded meshing gap; any first connecting member is in small sliding contact with the corresponding second connecting member; a calculation module is used to perform finite element simulation calculation on the multi-bolt connection model based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, and obtain the contact relationship between each bolt and the first connecting member. The target stress parameters include the axial stress, the first transverse stress, the second transverse stress and the axial stress moment of the bolt; the judgment module is used to determine the working load of the target bolt for any target bolt in the multi-bolt connection model based on the target stress parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt, as well as the preset material allowable value of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt under the working load meet the design requirements; the determination module is used to determine if the target bolt needs to be redesigned. In this way, the finite element simulation of the bolt connection through the gap contact algorithm can obtain the accurate bolt working load, thereby improving the accuracy of the bolt verification.

[0114] Based on the same application idea, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 5 As shown, the electronic device 500 includes: a processor 510 , a memory 520 and a bus 530 .

[0115] The memory 520 stores machine-readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 communicates with the memory 520 through the bus 530. When the processor 510 is running, the machine-readable instructions are executed by the steps of the bolt verification method provided in the above embodiment. The specific implementation method can be found in the method embodiment, which will not be repeated here.

[0116] Based on the same application concept, an embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of the bolt calibration method provided in the above embodiment are executed. The specific implementation method can be found in the method embodiment, which will not be repeated here.

[0117] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0118] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, 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 communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0119] 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.

[0120] In addition, each functional unit in the embodiments provided in the present application 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.

[0121] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0122] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0123] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A bolt calibration method, characterized in that: The method comprises: A multi-bolt connection model is established, and the contact relationship between each bolt, the first connection member corresponding to each bolt, and the second connection member in the multi-bolt connection model is determined; any bolt is in small slip contact with the corresponding first connection member through a flange gasket, and is in small slip contact with the corresponding second connection member through a threaded meshing gap; any first connection member is in small slip contact with the corresponding second connection member; Based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, a finite element simulation calculation is performed on the multi-bolt connection model to obtain target force parameters corresponding to each bolt; the target force parameters include the axial force, the first lateral force, the second lateral force and the axial force moment of the bolt; For any target bolt in the multi-bolt connection model, the working load of the target bolt is determined based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and based on the bolt material and bolt size parameters of the target bolt, and the preset material allowable value of the bolt connection parameters corresponding to the bolt material, it is judged whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition; If not, it is determined to redesign the target bolt.

2. The bolt checking method according to claim 1, characterized in that: The multi-bolt connection model is established according to the following steps: Based on a three-dimensional geometric model of a complex assembly consisting of a plurality of bolts, first connecting members and second connecting members corresponding to the plurality of bolts, finite element modeling is performed on the complex assembly, and material properties are assigned to the plurality of bolts, first connecting members and second connecting members corresponding to the plurality of bolts; The screw pre-tightening force of the multiple bolts and the working loads and boundary constraints of the first connecting member and the second connecting member corresponding to the multiple bolts are set to obtain the multi-bolt connection model.

3. The bolt checking method according to claim 1, characterized in that: The thread parameters of each bolt in the multi-bolt connection model include thread pitch, bolt nominal diameter, thread flank angle, thread vector direction, thread engagement direction, and gap contact active surface and driven surface point set; based on the thread parameters of each bolt in the multi-bolt connection model and the gap contact algorithm, the multi-bolt connection model is subjected to finite element simulation calculation to obtain the target force parameters corresponding to each bolt, including: Determining the overall connection stiffness between each bolt and the corresponding second connecting member based on the thread pitch, the bolt nominal diameter and the thread flank angle; Determine the local stiffness of the bolt thread of each bolt based on the thread vector direction, the thread engagement direction and the point set of the active surface and the driven surface of the clearance contact; According to the overall connection stiffness between each bolt and the corresponding second connecting member, the local stiffness of the bolt thread of each bolt and the preset target gap contact friction coefficient, a finite element simulation calculation is performed on the multi-bolt connection model through a gap contact algorithm to obtain the target force parameters corresponding to each bolt; the preset target gap contact friction coefficient is the gap contact friction coefficient determined according to the material properties of each bolt and the corresponding second connecting member.

4. The bolt checking method according to claim 2, characterized in that: The determining the working load of the target bolt based on the target force parameter corresponding to the target bolt and the single cylindrical bolt verification algorithm includes: Obtaining a bolt load and deformation relationship line in a single cylindrical bolt verification algorithm; the bolt load and deformation relationship line is used to represent a mapping relationship between the axial force of the bolt and the bolt deformation amount, and a mapping relationship between the clamping force of the connector and the connector deformation amount; Based on the target force parameter and the bolt load-deformation relationship line, the working load of the target bolt is determined.

5. The bolt checking method according to claim 4, characterized in that: The working load of the target bolt includes an axial working load, a lateral working load and an axial working torque load; the determining the working load of the target bolt based on the target force parameter and the bolt load and deformation relationship line includes: Determining, according to the bolt load-deformation relationship line, the bolt flexibility of the target bolt and the connection flexibility of the second connection member corresponding to the target bolt; Determining the axial working load of the target bolt according to the axial force of the target bolt, the bolt flexibility of the target bolt, the connection flexibility of the second connection member, and the screw preload; Determining a lateral working load of the target bolt according to a first lateral force and a second lateral force of the target bolt; The axial force moment of the target bolt is determined as the axial working torque load of the target bolt.

6. The bolt checking method according to claim 5, characterized in that: The method of judging whether the bolt connection parameters of the target bolt meet the design requirements under the working load condition based on the bolt material and bolt size parameters of the target bolt and the preset material allowable value of the bolt connection parameters corresponding to the bolt material includes: According to the working load of the target bolt, the bolt material and the bolt size parameters of the target bolt, the real value of the bolt connection parameter of the target bolt is determined by a single cylindrical bolt verification algorithm; Determine the ratio of the preset material allowable value of the bolt connection parameter corresponding to the bolt material to the corresponding true value of the bolt connection parameter of the target bolt as the index value of multiple target safety factors corresponding to the target bolt; If the index values ​​of the target safety factors are all within the corresponding preset safety factor index value range, it is determined that the target bolt meets the design requirements under the working load condition; If the index value of any of the target safety factors is not within the corresponding preset safety factor index value range, it is determined that the target bolt does not meet the design requirements under the working load condition.

7. The bolt checking method according to claim 6, characterized in that: The target safety factors include bolt size safety factor, tightening torque safety factor, ultimate strength safety factor under working load, fatigue failure safety factor, surface pressure safety factor, slip safety factor, shear safety factor and thread engagement safety factor.

8. A bolt checking device, characterized in that: The bolt checking device comprises: A modeling module is used to establish a multi-bolt connection model and determine the contact relationship between each bolt and the first connection member and the second connection member corresponding to each bolt in the multi-bolt connection model; any bolt is in small slip contact with the corresponding first connection member through a flange gasket and is in small slip contact with the corresponding second connection member through a threaded meshing gap; any first connection member is in small slip contact with the corresponding second connection member; a calculation module, configured to perform finite element simulation calculation on the multi-bolt connection model based on thread parameters of each bolt in the multi-bolt connection model and a gap contact algorithm, so as to obtain target force parameters corresponding to each bolt; the target force parameters include axial force, first lateral force, second lateral force and axial force moment of the bolt; A judgment module is used to determine the working load of any target bolt in the multi-bolt connection model based on the target force parameters corresponding to the target bolt and the single cylindrical bolt verification algorithm; and to judge whether the bolt connection parameters of the target bolt under the working load meet the design requirements based on the bolt material and bolt size parameters of the target bolt and the preset material allowable value of the bolt connection parameters corresponding to the bolt material; The determination module is used for determining whether or not to redesign the target bolt.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the bolt calibration method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the bolt calibration method according to any one of claims 1 to 7 are executed.

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