A rivet riveting quality detection method, system, device and storage medium

Abstract

The application discloses a rivet riveting quality detection method, system and device and a storage medium. Standard load-displacement curves of standard rivet joints are determined, the standard load-displacement curves are of the same rivet model and connected material, and the riveting quality meets preset quality requirements. A standard riveting quality evaluation tolerance band range is determined according to the standard load-displacement curves and a standard deviation of a target load-displacement curve. The riveting quality of a to-be-detected rivet joint is detected according to whether a to-be-detected load-displacement curve of the to-be-detected rivet joint is in the standard riveting quality evaluation tolerance band range corresponding to the rivet model and the connected material of the to-be-detected rivet joint. For different to-be-detected rivet joints, the riveting quality can be directly determined according to the to-be-detected load-displacement curve of the to-be-detected rivet joint and the corresponding standard riveting quality evaluation tolerance band range, so that the operation is simple, and the probability of reducing the accuracy of the riveting quality detection caused by manual measurement is reduced.

Description

Technical Field

[0001] This invention relates to the field of rivet quality inspection, and in particular to a method, system, device, and storage medium for inspecting the riveting quality of rivets. Background Technology

[0002] In general, the quality assessment of rivets mainly relies on manual measurement and inspection. For different types of rivets and collars, special templates are needed to test parameters such as the length and diameter of the rivets after riveting, according to different standards. This not only results in low inspection efficiency, but also makes the quality assessment results susceptible to human factors. Summary of the Invention

[0003] The purpose of this invention is to provide a method, system, device, and storage medium for riveting quality inspection of rivets. For different rivet joints to be tested, the riveting quality can be directly assessed based on the load-displacement curve of the rivet joint and the corresponding standard riveting quality evaluation tolerance range. This method is simple to operate and reduces the probability of decreased accuracy in riveting quality inspection due to manual measurement.

[0004] To solve the above-mentioned technical problems, the present invention provides a method for inspecting the riveting quality of rivets, comprising:

[0005] Determine the standard load-displacement curves for several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched.

[0006] The target load-displacement curve is determined based on each of the standard load-displacement curves, and the standard riveting quality assessment tolerance zone is determined based on the standard deviation of each of the standard load-displacement curves and the target load-displacement curve.

[0007] Determine the load-displacement curve of the rivet joint to be tested;

[0008] If the load-displacement curve to be tested is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint to be tested, then the rivet joint to be tested is determined to meet the preset quality requirements.

[0009] Preferably, before determining the standard load-displacement curves for several standard rivet joints, the process further includes:

[0010] A riveting test was performed on several first rivet joints to obtain the load-displacement curve of each first rivet joint; the rivet type and the connected material of each first rivet joint were the same.

[0011] Each of the standard rivet joints is determined from each of the first rivet joints.

[0012] Preferably, determining the target load-displacement curve based on each of the standard load-displacement curves includes:

[0013] The target load-displacement curve is determined by averaging the standard load-displacement curves.

[0014] Preferably, determining the target load-displacement curve based on each of the standard load-displacement curves includes:

[0015] The target load-displacement curve is determined by the least squares method based on each of the standard load-displacement curves.

[0016] Preferably, the standard riveting quality assessment tolerance zone range is determined based on the standard deviations of the respective standard load-displacement curves and the target load-displacement curve, including:

[0017] The standard deviation is determined based on each of the standard load-displacement curves and the target load-displacement curve;

[0018] Determine the first t-distribution critical value corresponding to the first pre-set confidence level and the second t-distribution critical value corresponding to the second pre-set confidence level;

[0019] The standard riveting quality assessment tolerance zone range is determined based on the standard deviation, the first t-distribution critical value, the second t-distribution critical value, and the target load-displacement curve.

[0020] Preferably, determining the standard deviation based on each of the standard load-displacement curves and the target load-displacement curve includes:

[0021] The standard deviation is determined based on the respective standard load-displacement curves and the target load-displacement curves, using the first expression.

[0022] The first expression is:

[0023] ;

[0024] in, The standard deviation is... For the i-th standard load-displacement curve, i is an integer greater than 1 but not greater than n. Let n be the target load-displacement curve, and n be the number of standard load-displacement curves.

[0025] Preferably, after determining the standard riveting quality assessment tolerance zone range based on the standard deviations of each of the standard load-displacement curves and the target load-displacement curve, the method further includes:

[0026] A riveting test is performed on several test rivet joints to determine the test load-displacement curve of each test rivet joint; the rivet type and the connected material of the test rivet joints are the same as those of the standard rivet joints.

[0027] Each of the test load-displacement curves is compared with the standard riveting quality assessment tolerance zone, and the proportion of the test load-displacement curves within the standard riveting quality assessment tolerance zone is determined.

[0028] If the ratio is greater than the preset confidence level, then proceed to the step of determining the load-displacement curve of the rivet joint to be tested.

[0029] To address the aforementioned technical problems, the present invention also provides a riveting quality inspection system for rivets, comprising:

[0030] The first determining unit is used to determine the standard load-displacement curves of several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched.

[0031] The second determining unit is used to determine the target load-displacement curve based on each of the standard load-displacement curves, and to determine the standard riveting quality evaluation tolerance zone range based on the standard deviation of each of the standard load-displacement curves and the target load-displacement curve.

[0032] The third determining unit is used to determine the load-displacement curve of the rivet joint to be tested;

[0033] The fourth determining unit is used to determine that the rivet joint under test meets the preset quality requirements if the load-displacement curve under test is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint under test.

[0034] To address the aforementioned technical problems, the present invention also provides a riveting quality inspection device for rivets, comprising:

[0035] Memory, used to store computer programs;

[0036] A processor, used to implement the steps of the riveting quality inspection method for rivets as described above when executing a computer program.

[0037] To address the aforementioned technical problems, the present invention also provides a non-volatile storage medium storing a computer program, which, when executed by a processor, implements the steps of the riveting quality detection method for rivets as described above.

[0038] This application provides a method, system, apparatus, and storage medium for inspecting the riveting quality of rivets. First, standard load-displacement curves are determined for several standard rivet joints with identical rivet types and connected materials, and whose riveting quality meets preset quality requirements. Then, the standard riveting quality assessment tolerance zone is determined based on the standard deviation of each standard load-displacement curve and the determined target load-displacement curve. The riveting quality of the rivet joint under test can be inspected by checking whether its load-displacement curve falls within the standard riveting quality assessment tolerance zone corresponding to the rivet type and connected material of the rivet joint under test. For different rivet joints under test, the riveting quality can be directly assessed based on the load-displacement curve and the corresponding standard riveting quality assessment tolerance zone. This method is simple to operate and reduces the probability of decreased accuracy in riveting quality inspection due to manual measurement. Attached Figure Description

[0039] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart illustrating a method for detecting the riveting quality of rivets provided by the present invention;

[0041] Figure 2 A schematic diagram of the standard load-displacement curves for each of the first type of standard rivet joints provided by the present invention;

[0042] Figure 3 A schematic diagram of the standard load-displacement curves for each of the second type of standard rivet joints provided by the present invention;

[0043] Figure 4 This is a schematic diagram of the first type of target load-displacement curve provided by the present invention;

[0044] Figure 5 This is a schematic diagram of the second type of target load-displacement curve provided by the present invention;

[0045] Figure 6 This invention provides a schematic diagram of the first standard riveting quality assessment tolerance zone range.

[0046] Figure 7This is a schematic diagram of the tolerance zone range for the second type of standard riveting quality assessment provided by the present invention;

[0047] Figure 8 A schematic diagram of the riveting quality inspection system for rivets provided by the present invention;

[0048] Figure 9 A schematic diagram of the riveting quality detection device for rivets provided by the present invention;

[0049] Figure 10 This is a schematic diagram of a non-volatile storage medium provided by the present invention. Detailed Implementation

[0050] The core of this invention is to provide a method, system, device, and storage medium for riveting quality inspection of rivets. For different rivet joints to be tested, the riveting quality can be directly assessed based on the load-displacement curve of the rivet joint and the corresponding standard riveting quality evaluation tolerance range. This method is simple to operate and reduces the probability of decreased accuracy in riveting quality inspection due to manual measurement.

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a method for inspecting the riveting quality of rivets provided by the present invention. The method includes:

[0053] S11: Determine the standard load-displacement curves for several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched.

[0054] A rivet is a device used to join two or more metal parts, commonly found in industries such as machinery, aerospace, and automotive. A rivet consists of a rivet head, a rivet shank, and a pull pin, and is installed using riveting pliers or a pneumatic riveting machine. There are many types of rivets, each tailored for a specific application, offering versatility, compatibility with different materials, and high shear strength. Rivets have a wide range of applications, including construction, aircraft, joints, jewelry, sporting goods manufacturing, aircraft manufacturing and maintenance, and building construction. The primary purpose of a rivet is to ensure a strong and reliable fastening of two or more metal or wood materials. The riveting process involves inserting the rivet end through a pre-drilled hole in the parts to be joined, then hammering or pressing the end of the rivet until it expands and forms a tight fit, creating a strong connection that resists tensile and shear forces. The working principle of a rivet is to establish a mechanical connection between the materials being joined. The rivet is inserted into a pre-drilled hole in the materials being joined, and then the end of the rivet is hammered or pressed until it expands and forms a tight fit. This creates a strong connection that resists tensile and shear forces. The types of rivets include solid rivets, blind rivets, drive rivets, self-piercing rivets, split rivets, tubular rivets, and countersunk rivets, and the types of materials they connect also vary, such as carbon fiber reinforced matrix composites, carbon steel, titanium alloys, and stainless steel.

[0055] After the materials are joined by rivets, the rivet joint needs to be quality inspected. In existing technologies, rivet quality inspection typically involves measuring the data of the rivet joint after riveting. However, for different rivet types and materials being joined, a manual template must be selected to measure parameters such as the length and diameter of the rivet joint. The measured data is then compared with that of a rivet joint meeting preset quality requirements to determine if the tested rivet joint also meets these requirements. However, due to inherent errors in manual measurement, the inspection results for the tested rivet joint may be significantly inaccurate, making it impossible to accurately determine whether the rivet is suitable for joining the materials.

[0056] To solve the above technical problems, before conducting riveting quality inspection of rivet joints, standard load-displacement curves of several standard rivet joints that meet the preset quality requirements are obtained. Since the rivet type and connected materials of each standard rivet joint are the same, the trend of the standard load-displacement curves of each standard rivet joint is the same.

[0057] It should be noted that the load-displacement curve refers to the curve in which the load on the rivet changes as the materials to be connected are riveted together and a tensile force is applied to the rivet. In other words, the load on the rivet changes with the displacement of the rivet. The horizontal axis of the curve is the tensile displacement when the rivet joint is stretched, and the vertical axis is the load on the rivet joint corresponding to the tensile displacement when the rivet joint is stretched.

[0058] S12: Determine the target load-displacement curve based on each standard load-displacement curve, and determine the standard riveting quality assessment tolerance zone range based on the standard deviation of each standard load-displacement curve and the target load-displacement curve;

[0059] After determining the standard load-displacement curves for each standard rivet joint, and since each standard rivet joint meets the preset quality requirements, the standard load-displacement curves also meet these requirements. Therefore, a target load-displacement curve can be determined based on these standard load-displacement curves, which also meet the preset quality requirements. Subsequently, the standard deviation between the standard load-displacement curves and the target load-displacement curve is used to determine the standard riveting quality assessment tolerance zone. Based on this, rivet joints whose load-displacement curves fall within the determined standard riveting quality assessment tolerance zone are considered to meet the preset quality requirements.

[0060] It should be noted that different standard rivet joints with different rivet types and / or connected materials will have different standard load-displacement curves, and thus different target load-displacement curves. Consequently, the range of the standard riveting quality assessment tolerance zone will also differ. Based on this, corresponding standard riveting quality assessment tolerance zones can be determined for various rivet types and connected materials. In other words, rivet joints with different rivet types and connected materials each have their own corresponding standard riveting quality assessment tolerance zones.

[0061] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the standard load-displacement curves for each of the first type of standard rivet joints provided by the present invention. Figure 3 This is a schematic diagram of the standard load-displacement curves for various second-type standard rivet joints provided by the present invention, where the horizontal axis X represents tensile displacement in mm, and the vertical axis F represents load in kV. Figure 2 The first standard rivet joint and Figure 3 The second type of standard rivet joint differs in rivet type and / or the materials being joined, therefore... Figure 2 The standard load-displacement curves of each of the first-type standard rivet joints show the same trend. Figure 3The standard load-displacement curves of each of the second type of standard rivet joints show the same trend, but Figure 2 and Figure 3 The trends of the standard load-displacement curves differ.

[0062] Please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the first type of target load-displacement curve provided by the present invention. Figure 5 This is a schematic diagram of a second type of target load-displacement curve provided by the present invention, wherein the relatively thicker curve represents the target load-displacement curve.

[0063] S13: Determine the load-displacement curve of the rivet joint to be tested;

[0064] Once the rivet joint to be tested for riveting quality inspection is identified, there is no need to manually measure the data of the rivet joint to be tested. Instead, the load-displacement curve of the rivet joint to be tested can be determined. For example, a rivet joint to be tested can be subjected to a rivet pull test or a rivet joint to be tested can be stretched. The curve of the load of the rivet joint to be tested changing with the tensile displacement during the stretching process is recorded, which is the load-displacement curve to be tested.

[0065] S14: If the load-displacement curve to be tested is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint to be tested, then the rivet joint to be tested is determined to meet the preset quality requirements.

[0066] In addition to determining the load-displacement curve to be tested, it is also necessary to determine the corresponding standard riveting quality assessment tolerance zone range based on the rivet type and the connected materials of the rivet joint to be tested. For example, from the standard riveting quality assessment tolerance zone ranges for different rivet types and connected materials determined in the above steps, select the standard riveting quality assessment tolerance zone range corresponding to the standard rivet joint with the same rivet type and connected materials as the rivet joint to be tested. Then determine whether the load-displacement curve to be tested is within the selected standard riveting quality assessment tolerance zone range. If it is within the range, it can be directly determined that the rivet joint to be tested meets the preset quality requirements. Correspondingly, if it is not within the range, it can be determined that the rivet joint to be tested does not meet the preset quality requirements. This improves the riveting quality inspection efficiency of the rivet joint to be tested. Furthermore, since the load-displacement curve can more accurately reflect the effect of the rivet joint in connecting the connected materials, the accuracy of the rivet quality inspection results is improved.

[0067] If the rivet type of the rivet joint to be tested is a solid rivet and the connected material is carbon fiber reinforced matrix composite, then when inspecting the riveting quality of the rivet joint to be tested, the standard riveting quality evaluation tolerance zone range determined according to the standard rivet joint with solid rivet type and carbon fiber reinforced matrix composite material should be selected for inspection.

[0068] In summary, for different rivet joints to be tested, the riveting quality can be directly assessed based on the load-displacement curve of the rivet joint and the corresponding standard riveting quality assessment tolerance range. This method is simple to operate and reduces the probability of decreased accuracy in riveting quality inspection due to manual measurement.

[0069] Based on the above embodiments:

[0070] As a preferred embodiment, before determining the standard load-displacement curves for several standard rivet joints, the method further includes:

[0071] A rivet test was performed on several first rivet joints to obtain the load-displacement curves of each first rivet joint; the rivet type and the materials being connected were the same for all first rivet joints.

[0072] Each standard rivet joint is determined from each first rivet joint.

[0073] In this embodiment, a riveting test is first performed on several first rivet joints with the same rivet type and connected materials. Specifically, a shear load or tensile load is applied to the first rivet joints connected to the materials until the first rivet joint is damaged. During the application of the load, the displacement rate of the first rivet joint should be no less than 7 mm / min and no more than 13 mm / min until the first rivet joint is damaged. After the first rivet joint is damaged, standard rivet joints can be selected based on whether the appearance change of each first rivet joint during the riveting test conforms to a preset standard appearance change trend. Of course, it is also necessary to further screen standard rivet joints based on the load-displacement curve of each first rivet joint. If the appearance change of the first rivet joint during the riveting test conforms to the preset standard appearance change trend, but the load-displacement curve is distorted, then it cannot be selected as a standard rivet joint. After determining each standard rivet joint from the first rivet joints, the load-displacement curve corresponding to each standard rivet joint is the standard load-displacement curve.

[0074] It should also be noted that, in this application, after determining the standard rivet joint based on each first rivet joint, and determining the corresponding standard load-displacement curve, target load-displacement curve, and standard riveting quality assessment tolerance range, the corresponding standard rivet joint can also be determined based on the first rivet joint of different rivet models and connected materials, and the corresponding standard riveting quality assessment tolerance range can also be determined. This is so that when conducting riveting quality tests on the rivet joints to be tested for different rivet models and connected materials, the corresponding standard riveting quality assessment tolerance range can be selected based on the rivet model and connected material of the rivet joint to be tested, and the load-displacement curve to be tested can be compared to determine whether the rivet joint to be tested meets the preset quality requirements.

[0075] For example, firstly, based on the first rivet joint with a solid rivet type and a carbon fiber reinforced composite material being joined, a corresponding standard rivet joint is determined, and the corresponding standard riveting quality assessment tolerance range is determined. This allows for quality inspection of the rivet joint to be tested with a solid rivet type and a carbon fiber reinforced composite material being joined. Alternatively, based on the first rivet joint with a blind rivet type and a carbon steel material being joined, a corresponding standard rivet joint is determined, and the corresponding standard riveting quality assessment tolerance range is determined. This allows for quality inspection of the rivet joint to be tested with a blind rivet type and a carbon steel material being joined. This process continues until the standard riveting quality assessment tolerance range corresponding to the first rivet joints with various rivet types and joined material combinations is determined. In other words, in this application, the first rivet joints corresponding to different rivet joints to be tested are different.

[0076] As a preferred embodiment, the target load-displacement curve is determined based on various standard load-displacement curves, including:

[0077] The target load-displacement curve is determined by averaging the standard load-displacement curves.

[0078] In this embodiment, the target load-displacement curve can be determined using the average value method. Specifically, several abscissas are selected on the horizontal axis, and the coordinates of the target load-displacement curve are determined based on the average value of the different ordinates corresponding to the same abscissa on each standard load-displacement curve. For example, after selecting several abscissas, they are determined as the first abscissa up to the j-th abscissa according to the direction of the horizontal axis. Then, the ordinate corresponding to the m-th abscissa is determined from each standard load-displacement curve, and the average value of each ordinate is calculated. The m-th abscissa and the calculated average value of each ordinate are determined as the m-th coordinate point of the target load-displacement curve. This process is repeated until the first to j-th coordinate points of the target load-displacement curve are determined, at which point the final target load-displacement curve can be determined. Here, j is an integer greater than 1, and m is an integer not less than 1 and not greater than j.

[0079] Since each standard load-displacement curve is a load-displacement curve of a standard rivet joint that meets the preset quality requirements, the target load-displacement curve determined by the average value method also meets the preset quality standards, and the calculation process is simple and the results are relatively accurate.

[0080] As a preferred embodiment, the target load-displacement curve is determined based on various standard load-displacement curves, including:

[0081] The target load-displacement curve is determined by the least squares method based on the standard load-displacement curves.

[0082] Furthermore, the target load-displacement curve can also be determined using the least squares method. Specifically, first, a line to be fitted is defined. Several abscissas are selected from the horizontal axis, and the ordinate of the target load-displacement curve is determined using the least squares method based on the different ordinates corresponding to the same abscissa on each standard load-displacement curve. This adjusts the line to be fitted to the best-fit line, i.e., the target load-displacement curve. For example, after selecting several abscissas from the horizontal axis, they are determined as the 1st to the jth abscissa according to the direction of the horizontal axis. Then, the ordinate corresponding to the mth abscissa from each standard load-displacement curve is determined, and the ordinate of the mth abscissa of the target load-displacement curve is calculated using the least squares method, i.e., the mth coordinate point. This process is repeated, adjusting the ordinates of the 1st to the jth coordinate points of the line to be fitted to determine the final target load-displacement curve. Here, j is an integer greater than 1, and m is an integer not less than 1 and not greater than j.

[0083] Since each least squares method is relatively stable in numerical calculation and is not easily affected by rounding errors, the final target load-displacement curve is more accurate, and the final riveting quality inspection results are more accurate.

[0084] It should be noted that, regardless of whether the target load-displacement curve is determined using the average value method or the least squares method, it should lie in the middle of the range covered by each standard load-displacement curve. Please refer to [reference needed]. Figure 4 and Figure 5 As shown, the final target load-displacement curve can be verified based on this.

[0085] As a preferred embodiment, the standard riveting quality assessment tolerance zone range is determined based on the standard deviations of various standard load-displacement curves and the target load-displacement curve, including:

[0086] The standard deviation is determined based on the standard load-displacement curves and the target load-displacement curve.

[0087] Determine the first t-distribution critical value corresponding to the first pre-set confidence level and the second t-distribution critical value corresponding to the second pre-set confidence level;

[0088] The standard riveting quality assessment tolerance zone range is determined based on the standard deviation, the first t-distribution critical value, the second t-distribution critical value, and the target load-displacement curve.

[0089] In this embodiment, when determining the tolerance zone range for standard riveting quality assessment, the standard deviation is first determined based on each standard load-displacement curve and the target load-displacement curve. Then, the corresponding first t-distribution critical value and second t-distribution critical value are selected according to the first preset confidence level and the second preset confidence level. Based on this, the tolerance zone range for standard riveting quality assessment can be determined by combining the target load-displacement curve.

[0090] Specifically, to improve the accuracy of riveting quality inspection results, a first pre-set reliability of 95% and a second pre-set reliability of 96% are selected. Then, the first t-distribution critical value is 2.78, and the second t-distribution critical value is 3. Therefore, the standard riveting quality assessment tolerance zone range is... ,in, For the target load-displacement curve, The standard deviation is expressed as the tolerance zone range for standard riveting quality assessment. Centered on, This represents the highest boundary of the standard riveting quality assessment tolerance zone. This represents the lowest boundary of the standard riveting quality assessment tolerance zone. to The range between these ranges is the standard riveting quality assessment tolerance zone. If the load-displacement curve of the rivet joint under test is within the corresponding standard riveting quality assessment tolerance zone, then the rivet joint under test has at least a 95% to 96% probability of being a rivet joint that meets the preset quality requirements.

[0091] It should be noted that in this application, the first t-distribution critical value corresponding to the first preset confidence level and the second t-distribution critical value corresponding to the second preset confidence level are determined. That is, the tolerance zone range of standard riveting quality assessment is determined based on the t-distribution. This application does not limit this. If the number of standard rivet joints is large, the tolerance zone range of standard riveting quality assessment can be determined based on the normal distribution by determining the first normal distribution critical value corresponding to the first preset confidence level and the second normal distribution critical value corresponding to the second preset confidence level.

[0092] As a preferred embodiment, the standard deviation is determined based on the various standard load-displacement curves and the target load-displacement curve, including:

[0093] The standard deviation is determined based on the standard load-displacement curves and the target load-displacement curve, using the first expression.

[0094] The first expression is:

[0095] ;

[0096] in, The standard deviation is... This represents the i-th standard load-displacement curve, where i is an integer greater than 1 but not greater than n. denoted as the target load-displacement curve, and n represents the number of standard load-displacement curves.

[0097] In this embodiment, the standard deviation is calculated based on the first expression. Specifically, several horizontal axes are selected on the horizontal axis, and the standard deviation corresponding to the horizontal axis is calculated based on the vertical coordinate of each standard load-displacement curve and the target load-displacement curve relative to the same horizontal axis. The standard deviations of each horizontal axis are then integrated to determine the overall standard deviation, which is the first expression. Decomposed into standard deviations corresponding to different x-axis values. It is decomposed into the ordinates corresponding to different abscissas of the i-th standard load-displacement curve. The target load-displacement curve is broken down into different x-axis values ​​corresponding to different y-axis values. The standard deviations of the different x-axis values ​​are calculated first, and then integrated into the overall standard deviation. For example, after selecting n horizontal coordinates on the horizontal axis, the standard deviation corresponding to the first horizontal coordinate is determined based on the vertical coordinate corresponding to the first horizontal coordinate in each standard load-displacement curve and the target load-displacement curve. This process is repeated until the standard deviation corresponding to the nth horizontal coordinate is determined. The standard deviations corresponding to the first horizontal coordinate to the nth horizontal coordinate are then integrated to determine the overall standard deviation. This is then combined with the first and second t-displacement critical values ​​determined above, as well as the target load-displacement curve, to determine the tolerance zone range for standard riveting quality assessment.

[0098] As a preferred embodiment, after determining the standard riveting quality assessment tolerance zone range based on the standard deviations of various standard load-displacement curves and the target load-displacement curve, the method further includes:

[0099] A riveting test was performed on several test rivet joints to determine the test load-displacement curve of each test rivet joint; the rivet type and the connected material of the test rivet joints were the same as those of the standard rivet joints.

[0100] Compare each test load-displacement curve with the standard riveting quality assessment tolerance zone range, and determine the proportion of test load-displacement curves within the standard riveting quality assessment tolerance zone range.

[0101] If the ratio is greater than the preset confidence level, proceed to the step of determining the load-displacement curve of the rivet joint to be tested.

[0102] In this embodiment, to further ensure the accuracy of the riveting quality test results, several test rivet joints can be subjected to riveting tests. By comparing the test load-displacement curves of each test rivet joint with the standard riveting quality assessment tolerance zone, if the proportion of the test load-displacement curves within the standard riveting quality assessment tolerance zone is greater than the preset confidence level, then the reliability of the determined standard riveting quality assessment tolerance zone is high, and the riveting quality of the rivet joint to be tested can be tested. If the proportion is not greater than the preset confidence level, then the standard riveting quality assessment tolerance zone needs to be adjusted.

[0103] Specifically, if 500 test rivet joints with the same rivet type and connected material as the standard rivet joint are subjected to riveting tests, and the test load-displacement curve of each test rivet joint is determined, and if the test load-displacement curve of 475 to 480 of the test rivet joints is within the standard riveting quality evaluation tolerance zone, then the riveting quality of the rivet joint to be tested can be inspected according to the standard riveting quality evaluation tolerance zone.

[0104] It should be noted that, for different rivet types and the standard riveting quality assessment tolerance range corresponding to the connected materials, the corresponding test rivet joint must be selected for testing. For example, for the standard riveting quality assessment tolerance range corresponding to solid rivets and carbon fiber reinforced composite materials, the test rivet joint with solid rivets and carbon fiber reinforced composite materials must be selected for testing.

[0105] Please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram illustrating the first standard riveting quality assessment tolerance zone range provided by the present invention. Figure 7 This is a schematic diagram of the tolerance zone range for the second standard riveting quality assessment provided by the present invention, wherein... Figure 6 The figure shows the tolerance zone range for the first standard riveting quality assessment, determined based on the first standard rivet joint. It can be seen that, through testing, the load-displacement curves of most test rivet joints that are the same as the first standard rivet joint are within the tolerance zone range for the first standard riveting quality assessment. Therefore, the tolerance zone range for the first standard riveting quality assessment can be put into use. Figure 7 The figure shows the tolerance zone range for the second standard riveting quality assessment, determined based on the second standard riveting joint. As can be seen from the test, the test load-displacement curves of most test rivet joints that are the same as the second standard riveting joint are within the tolerance zone range of the second standard riveting quality assessment. Therefore, the tolerance zone range of the second standard riveting quality assessment can be put into use.

[0106] Please refer to Figure 8 , Figure 8 This invention provides a structural schematic diagram of a rivet riveting quality inspection system, which includes:

[0107] The first determining unit 81 is used to determine the standard load-displacement curves of several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched.

[0108] The second determining unit 82 is used to determine the target load-displacement curve based on each standard load-displacement curve, and to determine the standard riveting quality evaluation tolerance zone range based on the standard deviation of each standard load-displacement curve and the target load-displacement curve.

[0109] The third determining unit 83 is used to determine the load-displacement curve of the rivet joint to be tested;

[0110] The fourth determining unit 84 is used to determine that the rivet joint under test meets the preset quality requirements if the load-displacement curve under test is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint under test.

[0111] For a description of the riveting quality inspection system for rivets provided by this invention, please refer to the above method embodiments; the invention itself will not be described in detail here.

[0112] Please refer to Figure 9 , Figure 9 This is a schematic diagram of a riveting quality inspection device for rivets provided by the present invention. The device includes:

[0113] Memory 91 is used to store computer programs;

[0114] The processor 92 is used to implement the steps of the riveting quality inspection method for rivets as described above when executing a computer program.

[0115] For a description of the riveting quality detection device for rivets provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0116] Please refer to Figure 10 , Figure 10 This is a schematic diagram of a non-volatile storage medium provided by the present invention. The non-volatile storage medium 101 stores a computer program 102. When the computer program 102 is executed by the processor 92, it implements the steps of the riveting quality detection method for rivets as described above.

[0117] For a description of the non-volatile storage medium 101 provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0118] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0119] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for inspecting the riveting quality of rivets, characterized in that, include: Tensile loads are applied to several first rivet joints to perform a rivet test until the first rivet joints are damaged, so as to obtain the load-displacement curves of each first rivet joint; the rivet type and the connected material of each first rivet joint are the same. Based on whether the appearance change of each of the first rivet joints under tensile load conforms to the preset standard appearance change trend, and whether the load-displacement curve of each of the first rivet joints is distorted, several standard rivet joints are determined from each of the first rivet joints. Determine the standard load-displacement curves for several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched. The target load-displacement curve is determined based on each of the standard load-displacement curves, and the standard riveting quality assessment tolerance zone is determined based on the standard deviation of each of the standard load-displacement curves and the target load-displacement curve. A riveting test is performed on several test rivet joints to determine the test load-displacement curve of each test rivet joint; the rivet type and the connected material of the test rivet joints are the same as those of the standard rivet joints. Each of the test load-displacement curves is compared with the standard riveting quality assessment tolerance zone, and the proportion of the test load-displacement curves within the standard riveting quality assessment tolerance zone is determined. If the ratio is greater than the preset confidence level, then the load-displacement curve of the rivet joint to be tested is determined; If the load-displacement curve to be tested is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint to be tested, then the rivet joint to be tested is determined to meet the preset quality requirements. The standard riveting quality assessment tolerance zone range is determined based on the standard deviations of the respective standard load-displacement curves and the target load-displacement curves, including: The standard deviation is determined based on each of the standard load-displacement curves and the target load-displacement curve; Determine the first t-distribution critical value corresponding to the first pre-set confidence level and the second t-distribution critical value corresponding to the second pre-set confidence level; The standard riveting quality assessment tolerance zone range is determined based on the standard deviation, the first t-distribution critical value, the second t-distribution critical value, and the target load-displacement curve.

2. The riveting quality inspection method for rivets as described in claim 1, characterized in that, The target load-displacement curve is determined based on each of the aforementioned standard load-displacement curves, including: The target load-displacement curve is determined by averaging the standard load-displacement curves.

3. The riveting quality inspection method for rivets as described in claim 1, characterized in that, The target load-displacement curve is determined based on each of the aforementioned standard load-displacement curves, including: The target load-displacement curve is determined by the least squares method based on each of the standard load-displacement curves.

4. The riveting quality inspection method for rivets as described in claim 3, characterized in that, Determining the standard deviation based on each of the standard load-displacement curves and the target load-displacement curve includes: The standard deviation is determined based on the respective standard load-displacement curves and the target load-displacement curves, using the first expression. The first expression is: ； in, The standard deviation is... For the i-th standard load-displacement curve, i is an integer greater than 1 but not greater than n. Let n be the target load-displacement curve, and n be the number of standard load-displacement curves.

5. A riveting quality inspection system for rivets, characterized in that, include: The first determining unit is used to determine the standard load-displacement curves of several standard rivet joints. The standard rivet joints are rivet joints whose riveting quality meets the preset quality requirements, and the rivet type and connected materials of each standard rivet joint are the same. The horizontal axis of the load-displacement curve is the tensile displacement, and the vertical axis is the load of the rivet joint when it is stretched. The second determining unit is used to determine the target load-displacement curve based on each of the standard load-displacement curves, and to determine the standard riveting quality evaluation tolerance zone range based on the standard deviation of each of the standard load-displacement curves and the target load-displacement curve. The third determining unit is used to determine the load-displacement curve of the rivet joint to be tested; The fourth determining unit is used to determine that the rivet joint under test meets the preset quality requirements if the load-displacement curve under test is within the standard riveting quality evaluation tolerance zone that corresponds to both the rivet type and the connected material of the rivet joint under test. The riveting quality inspection system is also used to apply tensile loads to several first rivet joints before triggering the first determining unit to perform a pull riveting test until the first rivet joints are damaged, so as to obtain the load-displacement curves of each first rivet joint; the rivet type and the connected material of each first rivet joint are the same; based on whether the appearance change of each first rivet joint under the action of tensile load conforms to the preset standard appearance change trend, and whether the load-displacement curves of each first rivet joint are distorted, several standard rivet joints are determined from each first rivet joint; The riveting quality inspection system for the rivets is further used to perform a pull riveting test on several test rivet joints before triggering the third determination unit, in order to determine the test load-displacement curve of each test rivet joint; the rivet type and the connected material of the test rivet joints are the same as those of the standard rivet joints; each test load-displacement curve is compared with the standard riveting quality assessment tolerance zone, and the proportion of the test load-displacement curve within the standard riveting quality assessment tolerance zone is determined; if the proportion is greater than a preset confidence level, the third determination unit is triggered; The second determining unit, when determining the standard riveting quality assessment tolerance zone range based on the standard deviations of each of the standard load-displacement curves and the target load-displacement curve, is specifically used for: The standard deviation is determined based on each of the standard load-displacement curves and the target load-displacement curve; the first t-distribution critical value corresponding to the first preset confidence level and the second t-distribution critical value corresponding to the second preset confidence level are determined; The standard riveting quality assessment tolerance zone range is determined based on the standard deviation, the first t-distribution critical value, the second t-distribution critical value, and the target load-displacement curve.

6. A device for detecting the riveting quality of rivets, characterized in that, include: Memory, used to store computer programs; A processor, configured to, when executing a computer program, implement the steps of the riveting quality inspection method for rivets as described in any one of claims 1-4.

7. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores a computer program, which, when executed by a processor, implements the steps of the riveting quality detection method for rivets as described in any one of claims 1-4.

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