Bolt pre-tightening force checking method, device, equipment and storage medium

Abstract

The present application relates to the technical field of bolt connection, and particularly relates to a bolt pre-tightening force checking method, device, equipment and storage medium, the method comprising: when a checking instruction is received, parameter information of a bolt to be checked and a corresponding hole position are obtained; the bolt to be checked is analyzed according to the parameter information and the hole position according to a preset working condition load, and load parameters are obtained; the minimum pre-tightening force of the bolt to be checked is obtained based on the load parameters, and the residual pre-tightening force percentage is obtained based on the load parameters and the actual pre-tightening force of the bolt to be checked; and the pre-tightening force of the bolt to be checked is checked according to the minimum pre-tightening force, the actual pre-tightening force and the residual pre-tightening force percentage. Compared with the existing checking by using a torque wrench, the present application does not need to use a torque wrench, and the accuracy of the checking is improved.

Description

Technical Field

[0001] This invention relates to the field of bolt connection technology, and in particular to a bolt preload verification method, apparatus, equipment, and storage medium. Background Technology

[0002] Currently, bolted connections are a common method of connection in battery pack structures. The preload of the bolts is an important factor affecting the mechanical characteristics of the connection surface. When the battery pack is subjected to alternating loads such as vibration and wind load, the bolt connection is prone to loosening and the preload will decrease, leading to connection failure, module detachment, and chassis disintegration, which seriously affects its safe use.

[0003] The current method for checking bolt preload is to measure the torque using a digital torque wrench and then calculate the preload. However, the accuracy of the check is low due to the limitations of the torque wrench's precision.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a bolt preload verification method, apparatus, equipment, and storage medium, aiming to solve the technical problem that the verification accuracy is low when using a torque wrench to verify bolt preload in the prior art.

[0006] To achieve the above objectives, the present invention provides a method for checking bolt preload, the method comprising the following steps:

[0007] Upon receiving the verification instruction, obtain the parameter information of the bolt to be verified and the corresponding hole position;

[0008] Based on the parameter information and the hole position, the bolt to be checked is analyzed according to the preset working condition load to obtain the load parameters;

[0009] The minimum preload of the bolt to be checked is obtained based on the load parameters, and the percentage of residual preload is obtained based on the load parameters and the actual preload of the bolt to be checked.

[0010] The preload of the bolt to be checked is verified based on the minimum preload, the actual preload, and the percentage of residual preload.

[0011] Optionally, the step of obtaining the minimum preload of the bolt to be checked based on the load parameters, and obtaining the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked, includes:

[0012] The transverse and axial loads of the bolt to be checked are obtained based on the load parameters.

[0013] The minimum preload of the bolt to be checked is determined based on the lateral load, and the percentage of residual preload is determined based on the axial load and the actual preload of the bolt to be checked.

[0014] Optionally, before the step of determining the minimum preload of the bolt to be checked based on the lateral load, the method further includes:

[0015] Obtain the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be checked;

[0016] Accordingly, the step of determining the minimum preload of the bolt to be checked based on the lateral load includes:

[0017] The minimum preload of the bolt to be checked is determined based on the lateral load, the reliability coefficient, the number of mating surfaces, and the friction coefficient.

[0018] Optionally, before the step of determining the percentage of residual preload based on the axial load and the actual preload of the bolt to be checked, the method further includes:

[0019] Obtain the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be checked;

[0020] The actual preload of the bolt to be checked is determined based on the actual applied torque, the tightening force coefficient, and the nominal thread diameter.

[0021] Optionally, the step of obtaining the parameter information of the bolt to be checked and the corresponding hole position when receiving the verification command includes:

[0022] Upon receiving a verification instruction, a 3D product model containing the bolt to be verified is obtained, and the parameter information of the bolt to be verified and the corresponding hole positions are determined based on the 3D product model.

[0023] Optionally, the 3D product model includes: the bolt to be checked and sheet metal accessories;

[0024] Accordingly, after the step of determining the parameter information of the bolt to be checked and the corresponding hole positions based on the 3D product model, the method further includes:

[0025] The sheet metal accessory is modeled, and the connection relationship between the positions of each hole in the modeled sheet metal accessory and the bolt to be checked is determined.

[0026] A bolt parameter table for the bolt to be checked is established based on the parameter information, and the bolt to be checked is modeled based on the bolt parameter table;

[0027] Accordingly, the step of analyzing the bolt to be checked according to the parameter information and the hole position under a preset working condition load to obtain the load parameters includes:

[0028] Based on the modeled sheet metal accessories and the modeled bolts to be checked, the modeled bolts to be checked are analyzed according to the preset working condition load to obtain load parameters.

[0029] Optionally, the step of analyzing the modeled sheet metal attachment and the modeled bolt to be checked according to a preset working condition load to obtain load parameters includes:

[0030] Based on the modeled sheet metal accessories and the modeled bolts to be checked, the working conditions of the modeled bolts to be checked are simulated according to the preset working condition load to obtain bolt stress information.

[0031] The stress information of the bolts is analyzed by alternating load analysis to obtain load parameter information.

[0032] Furthermore, to achieve the above objectives, the present invention also proposes a bolt preload checking device, the device comprising:

[0033] The instruction receiving module is used to obtain the parameter information of the bolt to be checked and the corresponding hole position when a verification instruction is received;

[0034] The parameter acquisition module is used to analyze the bolt to be checked according to the parameter information and the hole position under a preset working condition load to obtain load parameters;

[0035] The preload acquisition module is used to obtain the minimum preload of the bolt to be checked based on the load parameters, and to obtain the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked.

[0036] The preload force verification module is used to verify the preload force of the bolt to be verified based on the minimum preload force, the actual preload force, and the percentage of residual preload force.

[0037] Furthermore, to achieve the above objectives, the present invention also proposes a bolt preload verification device, the device comprising: a memory, a processor, and a bolt preload verification program stored in the memory and executable on the processor, the bolt preload verification program being configured to implement the steps of the bolt preload verification method as described above.

[0038] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a bolt preload verification program, wherein when the bolt preload verification program is executed by a processor, it implements the steps of the bolt preload verification method described above.

[0039] This invention, upon receiving a verification command, acquires the parameter information of the bolt to be verified and the corresponding hole positions; analyzes the bolt to be verified under a preset working condition load based on the parameter information and hole positions to obtain load parameters; obtains the minimum preload of the bolt to be verified based on the load parameters, and obtains the percentage of residual preload based on the load parameters and the actual preload of the bolt to be verified; and verifies the preload of the bolt to be verified based on the minimum preload, the actual preload, and the percentage of residual preload. Because this invention obtains the load parameters from the parameter information of the bolt to be verified and the corresponding hole positions, obtains the minimum preload based on the load parameters, obtains the percentage of residual preload based on the load parameters and the actual preload of the bolt to be verified, and finally verifies the preload of the bolt to be verified based on the minimum preload, the actual preload, and the percentage of residual preload, compared to existing verification methods that use a torque wrench, this invention eliminates the need for a torque wrench, thus improving the accuracy of the verification. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the bolt preload force verification equipment structure in the hardware operating environment involved in the embodiments of the present invention;

[0041] Figure 2 This is a flowchart illustrating the first embodiment of the bolt preload verification method of the present invention;

[0042] Figure 3 This is a flowchart illustrating the second embodiment of the bolt preload verification method of the present invention;

[0043] Figure 4 This is a schematic representation of bolt parameters in the second embodiment of the bolt preload verification method of the present invention;

[0044] Figure 5 This is a structural block diagram of the first embodiment of the bolt preload checking device of the present invention.

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] Reference Figure 1 , Figure 1This is a schematic diagram of the bolt preload force verification device structure in the hardware operating environment involved in the embodiments of the present invention.

[0048] like Figure 1 As shown, the bolt preload checking device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0049] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the bolt preload checking device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0050] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a bolt preload check program.

[0051] exist Figure 1 In the bolt preload verification device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the bolt preload verification device of the present invention can be set in the bolt preload verification device. The bolt preload verification device calls the bolt preload verification program stored in the memory 1005 through the processor 1001 and executes the bolt preload verification method provided in the embodiment of the present invention.

[0052] This invention provides a method for checking bolt preload, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the bolt preload verification method of the present invention.

[0053] In this embodiment, the bolt preload verification method includes the following steps:

[0054] Step S10: Upon receiving the verification instruction, obtain the parameter information of the bolt to be verified and the corresponding hole position.

[0055] It should be noted that the method in this embodiment can be applied to scenarios involving bolt preload verification, or other scenarios requiring preload verification. The executing entity in this embodiment can be a bolt preload verification device with data processing, network communication, and program execution functions, such as a torque wrench, or other devices capable of performing similar or identical functions. This embodiment and the following embodiments will be specifically described using the aforementioned bolt preload verification device (hereinafter referred to as the device).

[0056] It is understood that the above-mentioned verification instructions can be instructions used to cause the equipment to start performing preload verification, and the specific type of instructions is not limited in this embodiment.

[0057] It should be understood that the bolts to be checked can be any type and specification of bolts on the battery box, or bolts on other boxes. This embodiment does not impose any restrictions on them. This embodiment uses bolts on the battery box as examples of the bolts to be checked.

[0058] It should also be noted that the above parameter information can be information about the model, specifications, and dimensions of the bolt to be checked. In this embodiment, the parameter information may include the model of the bolt to be checked, the number of mating surfaces, the bolt axial direction in the reference coordinate system, the material grade, etc. Of course, other information may also be included, and the specific information can be set according to the actual situation.

[0059] It is understandable that the above-mentioned hole positions can be the positions of the bolts to be checked on the battery box.

[0060] Furthermore, considering that traditional preload verification requires disassembling the entire battery box and checking the preload separately, which is a rather cumbersome operation, in this embodiment, the above step S10 includes:

[0061] Step S11: Upon receiving the verification instruction, obtain a 3D product model with the bolt to be verified, and determine the parameter information of the bolt to be verified and the corresponding hole position based on the 3D product model.

[0062] It should be understood that the above-mentioned 3D product model can be the model corresponding to the above-mentioned battery box, which can be obtained by building according to a certain scale based on the actual structure of the battery box. Of course, it can also be obtained from other sources. This embodiment does not limit the specific method of obtaining it.

[0063] It should be noted that since the above 3D product model is based on the actual battery box, the above equipment can obtain the parameter information of the bolt to be checked and the corresponding hole positions based on the 3D product model.

[0064] In practice, when the above-mentioned equipment receives a verification instruction, it can import a 3D product model containing the bolt to be verified, and obtain the parameter information of the bolt to be verified and the corresponding hole positions based on the 3D product model.

[0065] Step S20: Analyze the bolt to be checked according to the parameter information and the hole position under the preset working condition load to obtain the load parameters.

[0066] It is understandable that the above-mentioned preset working condition load can be the load used for stress analysis of the bolt to be checked, and the specific working condition load can be set according to the actual situation.

[0067] It should be understood that the above load parameters can be parameters obtained by analyzing the bolts to be checked under preset working conditions, and may include transverse load and axial load, and of course may include other parameters, which are not limited in this embodiment.

[0068] In practice, after importing the 3D product model, the above-mentioned equipment can analyze the bolt to be checked according to the parameter information and hole position and the preset working condition load to obtain the load parameters.

[0069] Step S30: Obtain the minimum preload of the bolt to be checked based on the load parameters, and obtain the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked.

[0070] It should be noted that the minimum preload mentioned above can be the minimum preload that the bolt to be checked can withstand. For ease of explanation later, the minimum preload of the bolt to be checked can be denoted as Fs.

[0071] It is understood that the above-mentioned actual preload can be the preload that the bolt to be checked bears under the actual applied torque. The specific torque is not limited in this embodiment. For ease of subsequent explanation, the above-mentioned actual preload of the bolt to be checked can be denoted as F0, and the percentage of residual preload obtained can be denoted as S.

[0072] Furthermore, in order to accurately obtain the aforementioned minimum preload and residual preload percentage, in this embodiment, step S30 includes:

[0073] Step S31: Obtain the transverse load and axial load of the bolt to be checked based on the load parameters;

[0074] Step S32: Determine the minimum preload of the bolt to be checked based on the transverse load, and determine the percentage of residual preload based on the axial load and the actual preload of the bolt to be checked.

[0075] Furthermore, prior to the step of determining the minimum preload of the bolt to be checked based on the lateral load, the method further includes:

[0076] Step S321: Obtain the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be checked;

[0077] Accordingly, the step of determining the minimum preload of the bolt to be checked based on the lateral load includes:

[0078] Step S322: Determine the minimum preload of the bolt to be checked based on the lateral load, the reliability coefficient, the number of mating surfaces, and the friction coefficient.

[0079] It should be understood that the above reliability coefficient can be a parameter used to measure the safety level of the bolt to be checked in the actual engineering design. It can represent the ratio between the allowable stress and the working stress of the bolt to be checked. For ease of explanation, the above reliability coefficient can be denoted as C. Generally, the above reliability coefficient can be taken as 1.1 to 1.3. This embodiment does not impose any restrictions on the specific value.

[0080] It should also be noted that the number of mating surfaces mentioned above can be the data of the contact surfaces between the bolt to be checked and the connected parts in the bolt connection to be checked. Specifically, it can be obtained from the 3D product model mentioned above, and the number of mating surfaces can be denoted as m. The friction coefficient mentioned above can be a parameter used to describe the relationship between friction and normal force in the bolt connection to be checked, and the friction coefficient can be denoted as f. Generally, a value of 0.15 can be taken between the bolt and the connecting parts. Of course, other values ​​can also be used. The specific value can be set according to the actual situation.

[0081] It is understandable that the above-mentioned transverse load can be a load perpendicular to the axis in the bolt connection to be checked. In practical applications, the bolt to be checked may bear both axial load and transverse load at the same time. The axial load can be a load along the bolt axis in the bolt connection to be checked. The above-mentioned transverse load can be denoted as F2, and the above-mentioned axial load can be denoted as F1. Then, the minimum preload Fs can be determined according to Fs≥CF2 / mf.

[0082] Furthermore, before the step of determining the percentage of residual preload based on the axial load and the actual preload of the bolt to be checked, the method further includes:

[0083] Step S323: Obtain the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be checked;

[0084] Step S324: Determine the actual preload of the bolt to be checked based on the actual applied torque, the tightening force coefficient, and the nominal diameter of the thread.

[0085] It should be understood that the actual applied torque mentioned above can be the torque actually applied to the bolt to be checked in order to achieve the loading of the bolt to be checked. The actual applied torque can be denoted as M, and the unit is N·m. The tightening force coefficient mentioned above can be used to describe the relationship between the torque applied to the bolt to be checked and the generated preload force. The tightening force coefficient can be denoted as K. In this embodiment, K = 0.25 is used for explanation, but it is not limited to this.

[0086] It should be noted that the nominal diameter of the thread mentioned above can be the diameter corresponding to the thread size, such as M4, M6, etc., which is 4mm, 6mm, etc. In this embodiment, the nominal diameter of the thread is denoted as d, which can also be obtained from the 3D product model.

[0087] Therefore, the actual preload force F0 mentioned above can be calculated using the formula F0 = M / (K*d*10). -3 The residual preload percentage S can be obtained from S = (F0 - F1) / F0 * 100%.

[0088] In practical implementation, the above-mentioned equipment can obtain the transverse load and axial load based on the load parameters, and obtain the reliability coefficient, number of mating surfaces and friction coefficient of the bolt to be checked. Based on the transverse load, reliability coefficient, number of mating surfaces and friction coefficient, the minimum preload of the bolt to be checked is determined. The actual applied torque, tightening force coefficient and nominal thread diameter of the bolt to be checked are obtained, and the actual tightening force is determined based on the actual applied torque, tightening force coefficient and nominal thread diameter. Finally, the percentage of residual preload is determined based on the axial load and the actual preload.

[0089] Step S40: Check the preload of the bolt to be checked based on the minimum preload, the actual preload, and the percentage of residual preload.

[0090] Understandably, the aforementioned equipment can generate a preload risk diagram for the bolt to be checked based on the minimum preload, actual preload, and residual preload percentage. If the minimum preload is greater than the actual preload, the bolt to be checked is marked in red, indicating a risk of loosening under this condition. If the minimum preload is less than the actual preload, and the residual preload percentage is greater than 80%, the bolt to be checked is marked in green, meaning the bolt will be subjected to a small lateral load, requiring a small preload, and the axial force is essentially unaffected, with no risk of loosening. If the minimum preload is less than the actual preload, but the residual preload percentage is less than 80%, the bolt to be checked is marked in yellow, meaning loosening may not occur in a single analysis, but under long-term operation, there is a risk of loosening due to continuous preload decay.

[0091] In practical implementation, the above-mentioned equipment can draw a preload risk diagram based on the obtained minimum preload, actual preload, and residual preload percentage, and use the preload risk diagram to check the preload of the bolt to be checked.

[0092] In this embodiment, when the above-mentioned equipment receives a verification command, it can import a 3D product model containing the bolt to be verified, and obtain the parameter information of the bolt and the corresponding hole positions based on the 3D product model. After importing the 3D product model, it can analyze the bolt to be verified according to the parameter information and hole positions under preset working conditions and loads to obtain load parameters. Based on the load parameters, it obtains the transverse load and axial load, and acquires the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be verified. Based on the transverse load, reliability coefficient, number of mating surfaces, and friction coefficient, it determines the minimum preload of the bolt to be verified. It also acquires the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be verified, and determines the actual tightening force based on the actual applied torque, tightening force coefficient, and nominal thread diameter. Finally, it determines the percentage of residual preload based on the axial load and actual preload. Based on the obtained minimum preload, actual preload, and percentage of residual preload, it draws a preload risk diagram, and uses the preload risk diagram to verify the preload of the bolt to be verified. Compared to existing methods that use torque wrenches for calibration, this embodiment eliminates the need for torque wrenches, thereby improving the accuracy of the calibration.

[0093] It should also be emphasized that, since this embodiment does not require disassembling the battery casing, the preload force can be checked directly through the 3D product model, which improves the checking efficiency and reduces the cost.

[0094] refer to Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the bolt preload verification method of the present invention.

[0095] Considering that modeling each bolt to be checked individually would be cumbersome when creating a 3D product model, in order to improve efficiency, the 3D product model can be divided into bolts to be checked and sheet metal accessories in this embodiment.

[0096] The sheet metal accessories may include other parts of the 3D product model besides the bolts to be checked, but this embodiment does not limit the specifics.

[0097] Accordingly, after determining the parameter information of the bolt to be checked and the corresponding hole positions based on the 3D product model, the method further includes:

[0098] Step S12: Model the sheet metal accessory and determine the connection relationship between the positions of each hole in the modeled sheet metal accessory and the bolt to be checked.

[0099] It should be noted that when modeling the above-mentioned sheet metal accessories, the modeling can be carried out according to the conventional simulation modeling specifications. The digital model corresponding to the imported sheet metal accessories is used for strength simulation analysis modeling, and the mesh is divided, the parameter information of the bolt to be checked and the corresponding hole positions are determined.

[0100] Step S13: Establish a bolt parameter table for the bolt to be checked based on the parameter information, and model the bolt to be checked based on the bolt parameter table.

[0101] Understandably, the bolt parameter table mentioned above can be a table containing various parameters of the bolts to be checked, including bolt signals such as M4*6, number of mating surfaces, number of bolts, bolt axial direction in the reference coordinate system, material grade, etc. For details, please refer to [reference needed]. Figure 4 , Figure 4 This is a schematic representation of bolt parameters in the second embodiment of the bolt preload verification method of the present invention, as shown below. Figure 4 As shown in the figure, a partial list of bolt parameters is provided, specifically listing five types of bolt parameters: Bolt type: M4*8, number of mating surfaces: 1, number of bolts: 4, bolt axis: X, material grade: SUS304; Bolt type: M4*8, number of mating surfaces: 1, number of bolts: 6, bolt axis: Y, material grade: SUS304; Bolt type: M4*8, number of mating surfaces: 1, number of bolts: 6, bolt axis: Z, material grade: SUS304; Bolt type: M6*12, number of mating surfaces: 1, number of bolts: 4, bolt axis: Y, material grade: SUS304; Bolt type: M8*12, number of mating surfaces: 2, number of bolts: 6, bolt axis: X, material grade: SUS304.

[0102] Understandably, when modeling the bolts to be checked individually, BEAM (Beam Element) units can be used to create them based on the bolt parameter table. BEAM units can be three-dimensional elastic beam units that can withstand tension, compression, bending, and torsion. By using BEAM units, the bolts to be checked can be simplified, eliminating the need for detailed modeling of each bolt individually. Only the parameter information and connection relationships determined during the modeling of the sheet metal accessories are needed to create BEAM units in batches, which can be done using the parameter information in the bolt parameter table.

[0103] Accordingly, step S20 above includes:

[0104] Step S21: Analyze the modeled sheet metal accessories and the modeled bolts to be checked according to the preset working condition load to obtain load parameters.

[0105] Further, step S21 includes: performing a working condition simulation on the modeled sheet metal attachment and the modeled bolt to be checked according to a preset working condition load to obtain bolt stress information; and performing alternating load analysis on the bolt stress information to obtain load parameter information.

[0106] It is understandable that the above bolt force information can be the section-force information of the BEAM element of the bolt to be checked.

[0107] It should be understood that the aforementioned alternating loads may include vibration, wind load, etc., and this embodiment does not limit the specific loads.

[0108] In this embodiment, the above-mentioned equipment can use the bolt parameter table to model the bolts to be checked individually using BEAM elements, thus eliminating the need to model each bolt individually, reducing the complexity of modeling and improving the efficiency of checking.

[0109] Furthermore, this embodiment of the invention also proposes a storage medium storing a bolt preload verification program, which, when executed by a processor, implements the steps of the bolt preload verification method described above.

[0110] In addition, refer to Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the bolt preload checking device of the present invention. The present invention also proposes a bolt preload checking device, which includes:

[0111] The instruction receiving module 501 is used to obtain the parameter information of the bolt to be checked and the corresponding hole position when it receives the verification instruction;

[0112] The parameter acquisition module 502 is used to analyze the bolt to be checked according to the parameter information and the hole position under a preset working condition load to obtain load parameters;

[0113] The preload acquisition module 503 is used to obtain the minimum preload of the bolt to be checked based on the load parameters, and to obtain the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked.

[0114] The preload verification module 504 is used to verify the preload of the bolt to be verified based on the minimum preload, the actual preload, and the percentage of residual preload.

[0115] In this embodiment, when the above-mentioned equipment receives a verification command, it can import a 3D product model containing the bolt to be verified, and obtain the parameter information of the bolt and the corresponding hole positions based on the 3D product model. After importing the 3D product model, it can analyze the bolt to be verified according to the parameter information and hole positions under preset working conditions and loads to obtain load parameters. Based on the load parameters, it obtains the transverse load and axial load, and acquires the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be verified. Based on the transverse load, reliability coefficient, number of mating surfaces, and friction coefficient, it determines the minimum preload of the bolt to be verified. It also acquires the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be verified, and determines the actual tightening force based on the actual applied torque, tightening force coefficient, and nominal thread diameter. Finally, it determines the percentage of residual preload based on the axial load and actual preload. Based on the obtained minimum preload, actual preload, and percentage of residual preload, it draws a preload risk diagram, and uses the preload risk diagram to verify the preload of the bolt to be verified. Compared to existing methods that use torque wrenches for calibration, this embodiment eliminates the need for torque wrenches, thereby improving the accuracy of the calibration.

[0116] In one implementation, the instruction receiving module 501 is further configured to, upon receiving a verification instruction, acquire a 3D product model with the bolt to be verified, and determine the parameter information of the bolt to be verified and the corresponding hole position based on the 3D product model.

[0117] In one implementation, the parameter acquisition module 502 is further configured to obtain the transverse load and axial load of the bolt to be checked based on the load parameters; determine the minimum preload of the bolt to be checked based on the transverse load; and determine the percentage of residual preload based on the axial load and the actual preload of the bolt to be checked.

[0118] In one implementation, the parameter acquisition module 502 is further used to acquire the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be checked; and to determine the minimum preload of the bolt to be checked based on the transverse load, the reliability coefficient, the number of mating surfaces, and the friction coefficient.

[0119] In one implementation, the parameter acquisition module 502 is further used to acquire the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be checked; and to determine the actual preload of the bolt to be checked based on the actual applied torque, the tightening force coefficient, and the nominal thread diameter.

[0120] Based on the first embodiment of the bolt preload checking device of the present invention, a second embodiment of the bolt preload checking device of the present invention is proposed.

[0121] In this embodiment, the 3D product model includes: the bolt to be checked and sheet metal accessories; the instruction receiving module 501 is further used to model the sheet metal accessories and determine the connection relationship between the positions of each hole in the modeled sheet metal accessories and the bolt to be checked; establish a bolt parameter table for the bolt to be checked according to the parameter information, and model the bolt to be checked according to the bolt parameter table;

[0122] The parameter acquisition module 502 is also used to analyze the modeled bolts to be checked according to the modeled sheet metal accessories and the modeled bolts to be checked under preset working conditions to obtain load parameters.

[0123] In one implementation, the parameter acquisition module 502 is further configured to perform working condition simulation on the modeled sheet metal attachment and the modeled bolt to be checked according to a preset working condition load to obtain bolt stress information; and to perform alternating load analysis on the bolt stress information to obtain load parameter information.

[0124] Other embodiments or specific implementations of the bolt preload checking device of the present invention can be referred to the above-described method embodiments, and will not be repeated here.

[0125] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0126] The sequence numbers of the above embodiments of the present invention are merely for description and do not represent the superiority or inferiority of the embodiments. Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0127] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for checking bolt preload, characterized in that, The method includes the following steps: Upon receiving the verification instruction, obtain the parameter information of the bolt to be verified and the corresponding hole position; Based on the parameter information and the hole position, the bolt to be checked is analyzed according to the preset working condition load to obtain the load parameters; The minimum preload of the bolt to be checked is obtained based on the load parameters, and the percentage of residual preload is obtained based on the load parameters and the actual preload of the bolt to be checked. The preload of the bolt to be checked is verified based on the minimum preload, the actual preload, and the percentage of residual preload.

2. The bolt preload verification method as described in claim 1, characterized in that, The steps of obtaining the minimum preload of the bolt to be checked based on the load parameters, and obtaining the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked, include: The transverse and axial loads of the bolt to be checked are obtained based on the load parameters. The minimum preload of the bolt to be checked is determined based on the lateral load, and the percentage of residual preload is determined based on the axial load and the actual preload of the bolt to be checked.

3. The bolt preload verification method as described in claim 2, characterized in that, Before the step of determining the minimum preload of the bolt to be checked based on the lateral load, the method further includes: Obtain the reliability coefficient, number of mating surfaces, and friction coefficient of the bolt to be checked; Accordingly, the step of determining the minimum preload of the bolt to be checked based on the lateral load includes: The minimum preload of the bolt to be checked is determined based on the lateral load, the reliability coefficient, the number of mating surfaces, and the friction coefficient.

4. The bolt preload verification method as described in claim 2 or 3, characterized in that, Before the step of determining the percentage of residual preload based on the axial load and the actual preload of the bolt to be checked, the method further includes: Obtain the actual applied torque, tightening force coefficient, and nominal thread diameter of the bolt to be checked; The actual preload of the bolt to be checked is determined based on the actual applied torque, the tightening force coefficient, and the nominal thread diameter.

5. The bolt preload verification method as described in claim 1, characterized in that, The step of obtaining the parameter information of the bolt to be checked and the corresponding hole position when receiving the verification command includes: Upon receiving a verification instruction, a 3D product model containing the bolt to be verified is obtained, and the parameter information of the bolt to be verified and the corresponding hole positions are determined based on the 3D product model.

6. The bolt preload verification method as described in claim 5, characterized in that, The 3D product model includes: the bolt to be checked and sheet metal accessories; Accordingly, after the step of determining the parameter information of the bolt to be checked and the corresponding hole positions based on the 3D product model, the method further includes: The sheet metal accessory is modeled, and the connection relationship between the positions of each hole in the modeled sheet metal accessory and the bolt to be checked is determined. A bolt parameter table for the bolt to be checked is established based on the parameter information, and the bolt to be checked is modeled based on the bolt parameter table; Accordingly, the step of analyzing the bolt to be checked according to the parameter information and the hole position under a preset working condition load to obtain the load parameters includes: Based on the modeled sheet metal accessories and the modeled bolts to be checked, the modeled bolts to be checked are analyzed according to the preset working condition load to obtain load parameters.

7. The bolt preload verification method as described in claim 6, characterized in that, The step of analyzing the modeled sheet metal attachments and the modeled bolts to be checked according to preset working condition loads to obtain load parameters includes: Based on the modeled sheet metal accessories and the modeled bolts to be checked, the working conditions of the modeled bolts to be checked are simulated according to the preset working condition load to obtain bolt stress information. The stress information of the bolts is analyzed by alternating load analysis to obtain load parameter information.

8. A bolt preload checking device, characterized in that, The device includes: The instruction receiving module is used to obtain the parameter information of the bolt to be checked and the corresponding hole position when a verification instruction is received; The parameter acquisition module is used to analyze the bolt to be checked according to the parameter information and the hole position under a preset working condition load to obtain load parameters; The preload acquisition module is used to obtain the minimum preload of the bolt to be checked based on the load parameters, and to obtain the percentage of residual preload based on the load parameters and the actual preload of the bolt to be checked. The preload force verification module is used to verify the preload force of the bolt to be verified based on the minimum preload force, the actual preload force, and the percentage of residual preload force.

9. A bolt preload force verification device, characterized in that, The device includes: a memory, a processor, and a bolt preload verification program stored in the memory and executable on the processor, the bolt preload verification program being configured to implement the steps of the bolt preload verification method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores a bolt preload verification program, which, when executed by a processor, implements the steps of the bolt preload verification method as described in any one of claims 1 to 7.

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