Testing device and testing method

Abstract

The present invention discloses a testing device and a testing method. The testing device is used to test the bolt axial force attenuation rate in a sample to be tested or the friction coefficient between a first sample and a second sample. The testing device includes: a base, a driving member, a first tooling, a second tooling, and a tensile force sensor. The driving member is arranged on the base; the first tooling is connected to the driving member; the second tooling is connected to the base and is opposite to the first tooling; the tensile force sensor is used to obtain the tensile force between the first tooling and the second tooling. Among them, the first tooling and the second tooling are used to connect the sample to be tested, so as to apply reverse tensile forces to the first sample and the second sample respectively through the driving member. By applying the above technical solution, the bolt axial force attenuation rate in the sample or the friction coefficient between different samples can be tested, and the functionality and application range of the testing device can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and particularly to a testing device and a testing method for testing the friction coefficient and the bolt axial force attenuation rate. Background Art

[0002] At present, the testing principles of most friction coefficient testing devices are relatively similar, and the designs of the testing devices are different. However, most testing devices are mainly for the friction coefficient between two fixed materials or under a specific structure, and are not convenient for general application to the testing between various materials. In addition, other testing devices cannot simultaneously test the bolt axial force attenuation rate. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an object of the present invention is to provide a testing device that can test the bolt axial force attenuation rate in a test sample or the friction coefficient between different test samples, and can improve the functionality and application range of the testing device.

[0004] Another object of the present invention is to provide a testing method that uses the aforementioned testing device.

[0005] The testing device according to an embodiment of the present invention is used to test the bolt axial force attenuation rate in a test sample to be tested or the friction coefficient between a first test sample and a second test sample. The testing device includes: a base, a driving member, a first tooling, a second tooling, and a tensile force sensor. The driving member is provided on the base; the first tooling is connected to the driving member; the second tooling is connected to the base and is opposite to the first tooling; the tensile force sensor is used to obtain the tensile force between the first tooling and the second tooling. Among them, the first tooling and the second tooling are used to connect the test sample to be tested, so as to apply reverse tensile forces to the first test sample and the second test sample respectively through the driving member.

[0006] The testing device according to an embodiment of the present invention can test the bolt axial force attenuation rate in a test sample or the friction coefficient between different test samples, and can improve the functionality and application range of the testing device.

[0007] In addition, the testing device according to the above embodiment of the present invention may further have the following additional technical features:

[0008] In some embodiments, the testing device further includes: a pressure sensor, and the pressure sensor is configured to detect the pressure between the first test sample and the second test sample.

[0009] In some embodiments, the testing device further includes: a bolt positioning assembly for connecting a first sample and a second sample, wherein the pressure sensor is disposed on the bolt positioning assembly and at a position where the pressure sensor can abut against the first sample or the second sample on the bolt positioning assembly.

[0010] In some embodiments, slots and pin holes are provided on the first tooling and the second tooling, the slots on the first tooling and the slots on the second tooling are opposite to each other, and the pin holes penetrate opposite side walls of the corresponding slots.

[0011] In some embodiments, the base includes: a chassis, a first fixing frame, and a second fixing frame. The first fixing frame is connected to the chassis; the second fixing frame is connected to the chassis and is disposed opposite to the first fixing frame. Wherein, the driving member is connected to the first fixing frame, and the second tooling is connected to the second fixing frame.

[0012] In some embodiments, the tensile sensor is connected between the driving member and the first tooling.

[0013] In some embodiments, the tensile sensor is integrated into the driving member.

[0014] In some embodiments, the driving member is a hydraulic driving device.

[0015] According to the method for testing the friction coefficient of an embodiment of the present invention, the testing method uses the aforementioned testing device, and the testing method includes: assembling a sample to be tested including a first sample and a second sample, and obtaining the pressure value between the first sample and the second sample; installing the assembled sample to be tested on the first tooling and the second tooling; controlling the driving member to apply a gradually changing tensile force to the first tooling in a direction away from the second tooling; when the tensile force changes suddenly or the first workpiece moves relative to the second workpiece, controlling the driving member to stop applying the tensile force and obtaining the tensile force value; determining the friction coefficient between the first workpiece and the second workpiece according to the tensile force value and the pressure value.

[0016] According to the method for testing the friction coefficient of an embodiment of the present invention.

[0017] In some embodiments, the sample to be tested includes two first samples and two second samples. The two first samples are spaced apart and clamped between the two second samples, wherein the two first samples are respectively used to connect the first tooling and the second tooling.

[0018] In some embodiments, the first sample and the second sample are respectively surface-treated and then assembled into the sample to be tested.

[0019] In some embodiments, the sample to be measured is connected to the first tooling by a first pin shaft, and the first pin shaft is in transitional fit with the mating holes on the sample to be measured and the first tooling; the sample to be measured is connected to the second tooling by a second pin shaft, and the second pin shaft is in transitional fit with the mating holes on the sample to be measured and the second tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a testing device in some embodiments of the present invention.

[0021] Figure 2 is a flowchart of a testing method in some embodiments of the present invention.

[0022] Figure 3 is a simulation analysis result of simulating and analyzing the friction force between different connection surfaces of the measured part.

[0023] REFERENCE SIGNS:

[0024] 100, testing device; 1, first fixing frame; 2, driving member; 3, tension sensor; 41, first tooling; 42, second tooling; 5, first sample; 6, pressure sensor; 7, second sample; 8, bolt positioning assembly; 9, second fixing frame; 10, chassis. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In the related art, the tooling of a friction coefficient measuring device for steel plates and bushings includes a left bracket and a right bracket. The left and right brackets clamp the workpiece by a bolt locking method, and can measure the friction coefficient of bushings and steel plate parts with a specific structure. However, there are the following problems: First, it only measures the friction coefficient between the bushing and the steel plate, and the application range is relatively narrow; second, in addition to a hydraulic cylinder and sensors, this technical solution also requires a specific tooling, resulting in a high cost; third, in the above technical solution, the tension of the bushing core shaft must be in the middle position of the core shaft to ensure uniform friction force at both ends of the core shaft. However, in the actual operation of the above technical solution, this position is not easy to guarantee, which may lead to errors in the measured friction coefficient; fourth, the above technical solution cannot measure the decay rate of the bolt axial force under the endurance condition, and cannot study the relationship between the friction force at the bolt fastening part and the bolt decay rate.

[0026] Therefore, in order to solve the disadvantages in the related art, the present invention proposes a testing device and a measuring method using the testing device, which can measure the decay rate of the bolt axial force in the sample or the friction coefficient between different samples, and can improve the functionality and application range of the testing device.

[0027] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0028] Combined with Figures 1 to 2 , a test device 100 according to an embodiment of the present invention is used to test the bolt axial force attenuation rate in a sample to be tested or the friction coefficient between a first sample and a second sample. The test device 100 includes: a base, a driving member 2, a first tooling 41, a second tooling 42, and a tension sensor 3. Specifically, the driving member 2 is disposed on the base, the first tooling 41 is connected to the driving member 2, the second tooling 42 is connected to the base and is opposite to the first tooling 41, and the tension sensor 3 is used to obtain the tension between the first tooling 41 and the second tooling 42. Among them, the first tooling 41 and the second tooling 42 are used to connect the sample to be tested to respectively apply reverse tension to the first sample 5 and the second sample 7 through the driving member 2. That is to say, the first tooling 41 and the second tooling 42 can be respectively connected to two different samples to be tested, and the driving member 2 can apply reverse tension to the first sample 5 and the second sample 7, that is, apply force to the first sample 5 and the second sample 7. When the driving member 2 works, the tension between the first sample 5 and the second sample 7 can be obtained through the tension sensor 3, and the friction coefficient between the first sample 5 and the second sample 7 can be obtained according to the tension value. It can also be that when the driving member 2 works, if the tension changes suddenly or the first tooling 41 moves relative to the second tooling 42, obtaining the current tension value can be used to judge the bolt axial force attenuation rate of the sample.

[0029] The test device 100 according to an embodiment of the present invention can test the bolt axial force attenuation rate in a sample or the friction coefficient between different samples, which can improve the functionality and application range of the test device 100.

[0030] In actual application, the first sample 5 and the second sample 7 are installed on the first tooling 41 and the second tooling 42. The driving member 2 drives the first tooling 41 until the first tooling 41 moves relative to the second tooling 42 or the tension changes suddenly, then stops driving, obtains the tension value, and determines the bolt axial force attenuation rate in the sample to be tested or the friction coefficient between the first sample 5 and the second sample 7 according to the tension value. Therefore, the test device 100 according to the embodiment of the present invention can realize the test of different materials, can improve the application range of the device, and is beneficial to improving the detection accuracy.

[0031] In order to detect the friction coefficient, it is also necessary to obtain the first sample 5 and the second sample 7. During each detection, the first sample 5 and the second sample 7 can be made to have the same pressure, thus simplifying the operation; alternatively, a pressure sensor 6 can be provided in the test device 100 to quickly detect the pressure between the first sample 5 and the second sample 7, thereby improving the accuracy. There can be various different ways to detect the pressure between the first sample 5 and the second sample 7. For example, the elastic force balance method can be used to measure the pressure between the first sample 5 and the second sample 7. Moreover, after the pressure detection, the test sample to be measured can be installed on the first tooling 41 and the second tooling 42. In some embodiments of the present invention, the test device 100 further includes: a pressure sensor 6, which is configured to detect the pressure between the first sample 5 and the second sample 7, facilitating the acquisition of accurate friction coefficient and bolt axial force attenuation rate. Specifically, the pressure sensor 6 can collect the pressure between the first sample 5 and the second sample 7. By combining the pressure value collected by the pressure sensor 6 and the tensile force value collected by the tensile sensor 3, the accuracy of the test results can be improved.

[0032] Optionally, the test device 100 further includes: a bolt positioning assembly 8, which is used to connect the first sample 5 and the second sample 7, facilitating installation and positioning, improving the assembly stability, making the friction force of the sample under tension more uniform after the first sample 5 and the second sample 7 are fixed, and being conducive to improving the test accuracy. The pressure sensor 6 is provided on the bolt positioning assembly 8, which can not only make the pressure sensor 6 have a certain pressing force with the sample to be measured, improving the detection sensitivity and accuracy, but also facilitating the simplification of the device structure. Specifically, the pressure sensor 6 is provided on the bolt positioning assembly 8 and can abut against the position of the first sample 5 or the second sample 7, directly detecting the pressure value of the first sample 5 or the second sample 7. Further, when the pressure sensor 6 is provided on the bolt positioning assembly 8 and can abut against the position of the first sample 5 or the second sample 7, the effect of synchronously collecting the normal pressure and the tangential tensile force can be achieved, with high precision, which is conducive to obtaining accurate friction coefficient and bolt axial force attenuation rate after endurance loading. That is to say, the pressure sensor 6 abutting against the first sample 5 or the second sample 7 can detect the centripetal force of the sample and the force received in the tangential direction when the sample moves.

[0033] Optionally, the first tooling 41 and the second tooling 42 are provided with slots and pin holes. The slots on the first tooling 41 and the second tooling 42 are opposite to each other, and the pin holes penetrate the opposite side walls of the corresponding slots, which can improve the connection stability, can also ensure to a large extent that the tensile force output by the actuator is along the length direction of the sample, and can improve the consistency of the friction forces on the two friction surfaces of the sample under tension, thereby improving the accuracy of the friction coefficient test, and the structure is simple and easy to manufacture and assemble.

[0034] Combined with Figure 1, Optionally, the base includes: a chassis 10, a first fixing frame 1, and a second fixing frame 9. Among them, the chassis 10 can provide a supporting function, and each component of the device can be arranged on the chassis 10 to facilitate spatial arrangement. The first fixing frame 1 and the second fixing frame 9 are oppositely arranged on the chassis 10, which can improve the stability and balance of the structure. Specifically, the first fixing frame 1 is connected to the chassis 10; the second fixing frame 9 is connected to the chassis 10 and is oppositely arranged to the first fixing frame 1. Among them, the driving member 2 is connected to the first fixing frame 1, and the second tooling 42 is connected to the second fixing frame 9. Combining the foregoing, it can be seen that the first fixing frame 1 is connected to the driving member 2, the driving member 2 is connected to the first tooling 41, and the first tooling 41 is opposite to the second tooling 42, and the second tooling 42 is connected to the second fixing frame 9. Thus, a relatively symmetrical structure is constructed on the chassis 10 to improve the detection accuracy.

[0035] Optionally, the tensile force sensor 3 is connected between the driving member 2 and the first tooling 41. In this way, when the driving member 2 drives the first tooling 41, the tensile force sensor 3 can directly detect the tensile force value, which is beneficial to improving the detection accuracy.

[0036] Optionally, the tensile force sensor 3 is integrated into the driving member 2, which can simplify the structure and is beneficial to feedback the magnitude of the tensile force generated by the driving member 2.

[0037] Optionally, the driving member 2 is a hydraulic driving device. Specifically, under the condition of the same power for small parts, the hydraulic driving device has a small volume, light weight, and compact structure, which is beneficial to spatial arrangement and energy saving. In addition, the hydraulic driving device has good durability and is easy to obtain, which can improve the practicability and economy of the testing device 100.

[0038] Combined with Figures 1 to 2 , according to the friction coefficient testing method of the embodiment of the present invention, the testing method uses the foregoing testing device 100, and the testing method includes the following steps: S10, assembling a sample to be tested including a first sample 5 and a second sample 7, and obtaining the pressure value between the first sample 5 and the second sample 7. S20, installing the assembled sample to be tested on the first tooling 41 and the second tooling 42. S30, controlling the driving member 2 to apply a gradually changing tensile force to the first tooling 41 in a direction away from the second tooling 42. S40, when the tensile force suddenly changes or the first workpiece moves relative to the second workpiece, controlling the driving member 2 to stop applying the tensile force and obtaining the tensile force value. S50, determining the friction coefficient between the first workpiece and the second workpiece according to the tensile force value and the pressure value.

[0039] According to the friction coefficient testing method of the embodiment of the present invention, the bolt axial force attenuation rate in the sample or the friction coefficient between different samples can be tested, which can improve the application range of the testing device 100, and has simple operation and high accuracy.

[0040] In actual application, first assemble the test sample and install the pressure sensor 6. Install the assembled test sample on the fixture on the chassis 10; debug the signals of the tension sensor 3, displacement signal and pressure sensor 6 to ensure normal test signals; load and collect the tension, displacement and pressure signals between the samples to ensure test accuracy; stop loading when the load of the driving member 2 suddenly changes and the displacement changes greatly; calculate the friction coefficient between the measured samples according to the collected tension and pressure signals; load according to the load of the durability working condition and record the relationship between the number of durability cycles and the axial force attenuation.

[0041] Furthermore, in the present invention, the measured part is processed into a standard sample, and the surface of the standard sample is treated according to the actual part surface, which is more in line with the actual part surface state of the chassis bolt connection part and has good versatility. In addition, in the present invention, the sample and the fixture are connected in a pin-hole matching manner, which can ensure to a large extent that the pulling force output by the actuator is along the length direction of the sample, and the consistency of the frictional forces on the two friction surfaces of the tensioned sample can be improved according to the sample assembly method of the present invention, thereby improving the accuracy of the friction coefficient test. At the same time, the present invention uses a bolt fastening method to compress the measured sample and measures the axial force of the bolt, so the attenuation rate of the bolt axial force under the action of external force in the durability working condition can be measured.

[0042] That is to say, the test device 100 and method of the present invention can not only efficiently and accurately measure the friction coefficient between the bolt-connected components, but also accurately measure the attenuation rate of the bolt axial force at the bolt fastening part, have good versatility, and can quickly measure the friction coefficient of the connected parts and the anti-attenuation of the bolt axial force in the early stage of bolt fastener development, which is beneficial to improving the connection reliability design of the bolt positioning component 8. Compared with the measurement method of the friction coefficient between the chassis bolt connectors in the related art, the test device 100 of the present invention not only improves the test efficiency and reduces the test cost, but also can improve the test accuracy. Moreover, the test device 100 of the embodiments of the present invention can be conveniently applied to study the influence of factors such as bolt pressing force, surface roughness between the measured samples, surface treatment method, and surface paint film thickness on the friction coefficient, provides strong support for the refined design of the friction coefficient between the chassis bolt connectors, improves the application range of the device, is beneficial to saving resources, and reduces the detection cost.

[0043] Combined with Figure 1, optionally, the sample to be measured includes two first samples 5 and two second samples 7. The two first samples 5 are arranged at intervals and clamped between the two second samples 7. The two first samples 5 are respectively used to connect the first tooling 41 and the second tooling 42, which can improve the accuracy of detection. Specifically, the first tooling 41 and the second tooling 42 are opposite to each other horizontally. The first sample 5 has a first end and a second end. The first ends of the two first samples 5 are respectively connected to the first tooling 41, and there is a certain interval between the second ends of the two first samples 5. The two second samples 7 are respectively located on the upper surface and the lower surface of the first sample 5, and the two second samples 7 clamp one side of the second ends of the two first samples 5 to form a stacked structure. In this way, the second sample 7 can be in contact with the upper surface and the lower surface of the first sample 5, which can improve the accuracy of the friction coefficient detection.

[0044] Furthermore, the stacked structure formed by the first sample 5 and the second sample 7 can be fixed by a bolt positioning component 8. Two sets of bolt positioning components 8 can be provided. The two bolt positioning components 8 respectively pass through the overlapping parts of the two first samples 5 and the second sample 7, which can improve the stability of the structure. In addition, the pressure sensor 6 can be connected between the second sample 7 and the bolt positioning to measure the pressure value between the first sample 5 and the second sample 7, and it is beneficial for layout and simplifies the device structure. Among them, the bolt positioning component 8 can be in the form composed of a screw and a nut.

[0045] Optionally, the first sample 5 and the second sample 7 are assembled into the sample to be measured after surface treatment. Specifically, the measured part can be processed into a standard sample, and the surface of the standard sample is treated according to the actual part surface, which not only avoids the problem that the actual part is not easy to measure, but also conforms to the actual part surface state and has good versatility.

[0046] Optionally, the sample to be measured is connected to the first tooling 41 by a first pin shaft, and the first pin shaft has an interference fit with the mating hole on the sample to be measured and the first tooling 41; the sample to be measured is connected to the second tooling 42 by a second pin shaft, and the second pin shaft has an interference fit with the mating hole on the sample to be measured and the second tooling 42.

[0047] For example, Figure 3 shows the simulation analysis results of simulating the friction force between different connection surfaces of the measured part. In the present invention, the sample and the tooling can be connected in the way of pin hole fit to ensure that the pulling force output by the actuator is along the length direction of the sample, and according to the sample assembly method in the present invention, it can be ensured that the friction forces of the two friction surfaces of the tensioned sample are the same, as shown in the simulation analysis results of Figure 3 Thus, the accuracy of the friction coefficient test and the accuracy of the bolt axial force attenuation rate are improved. In other words, the technical solution of the present invention can not only measure the friction coefficient but also measure the attenuation rate of the axial force at the bolt fastening part under the durability condition, which provides a test method for the bolt fastening connection design and development.

[0048] A testing device 100 according to a specific embodiment of the present invention will be described below with reference to the accompanying drawings.

[0049] Combination Figures 1 to 2 The test device 100 according to the embodiment of the present invention comprises: a base, a driving member 2, a tension sensor 3, a first tool 41, a second tool 42, two first samples 5, a pressure sensor 6, two second samples 7 and a bolt positioning assembly 8, wherein the base comprises a base frame 10, a first fixing frame 1 and a second fixing frame 9. Specifically, the first fixing frame 1 and the second fixing frame 9 are arranged at the left and right ends of the base frame 10 in a relative manner, and the first fixing frame 1, the driving member 2, the tension sensor 3 and the first tool 41 are connected in sequence in the left and right direction or in the horizontal direction, and the second tool 42 is connected to the second fixing frame 9 in the direction toward the first fixing frame 1, and the second tool 42 is opposite to the first tool 41. When in use, the two first samples 5 are respectively mounted on the first tool 41 and the second tool 42, and there is a gap between the two first samples 5, and the two second samples 7 are respectively located above and below the first sample 5, and abut against the upper surface and lower surface of the two first samples 5. The pressure sensor 6 is in contact with the second sample 7 located above, and the pressure sensor 6 , the first sample 5 and the second sample 7 can be fixedly connected in the up and down directions by a bolt positioning assembly 8 .

[0050] Preferably, the driving member 2 can be a hydraulic cylinder, and the first fixed frame 1 is a fixed frame of the hydraulic cylinder; the second fixed frame 9 can be a reaction frame to provide reverse tension; the base frame 10 can be an iron base plate to improve the structural strength. Specifically, the control accuracy of the hydraulic cylinder can determine the accuracy of the test load increase, thereby affecting the accuracy of the friction coefficient measurement result; the measurement accuracy of the tension sensor 3 and the pressure sensor 6 affects the accuracy of the subsequent friction coefficient calculation and the accuracy of the bolt axial force attenuation rate; the sample tooling pin hole matching design can ensure that the tension loaded in the test is along the length direction of the test sample, so that the pulled sample is only subjected to unidirectional tensile load, and will not be affected by other directional forces or additional torques, thereby ensuring that the direction of the friction force obtained by the test is relatively single and stable, which can improve the accuracy and stability of the friction coefficient test.

[0051] In actual application, the driving part 2 is a hydraulic driving device, such as a hydraulic actuator. The hydraulic actuator and the first fixed frame 1 can be selected according to the existing equipment in the laboratory, and no specific requirements are made for the shape and structure. The tension sensor 3 is provided by the hydraulic actuator, and no shape and structure requirements are made. The pin-hole matching method is adopted between the sample tooling and the sample, and the tolerance control requires clearance matching. The shape of the sample to be tested is a rectangular parallelepiped, for example, the size can be designed according to 180*40*10. The samples to be tested are spaced according to Figure 1Assemble in the manner shown, and pre-tighten with two bolts so that there is a certain pressing force between the test specimens. A pin-hole fit is adopted between the outer ends of the specimens sandwiched in the middle and the tooling. The tooling on the hydraulic cylinder side is fixedly connected to the thrust rod of the hydraulic cylinder, and the side tooling is fixedly connected to the second fixing frame 9 (reaction frame). The hydraulic cylinder is connected to the first fixing frame 1 by bolts, and the first fixing frame 1 and the second fixing frame 9 are connected to the chassis 10 by rails and bolts.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "lateral", "length", "thickness", "upper", "lower", "left", "right", "bottom", "inner", "outer", "axial", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0054] In the present invention, unless otherwise clearly specified and defined, the terms "install", "connect", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A test device for testing the bolt axial force attenuation rate in a sample to be tested or the friction coefficient between a first sample and a second sample, characterized in that, The test device includes: a base; a driving member disposed on the base; a first tooling connected to the driving member; a second tooling connected to the base and opposite to the first tooling; a tensile force sensor for obtaining the tensile force between the first tooling and the second tooling, a pressure sensor configured to detect the pressure between the first sample and the second sample; a bolt positioning assembly for connecting the first sample and the second sample, the pressure sensor being disposed on the bolt positioning assembly and at a position where the pressure sensor on the bolt positioning assembly can abut against the first sample or the second sample; wherein, the first tooling and the second tooling are used to connect the sample to be tested, so as to apply reverse tensile forces to the first sample and the second sample respectively through the driving member; the sample to be tested includes two first samples and two second samples, the two first samples are spaced apart and clamped between the two second samples, and the two first samples are respectively used to connect the first tooling and the second tooling.

2. The testing device according to claim 1, characterized in that, Slots and pin holes are provided on the first tooling and the second tooling, the slots on the first tooling are opposite to the slots on the second tooling, and the pin holes penetrate through the opposite side walls of the corresponding slots.

3. The test device according to claim 1, wherein The base includes: a chassis; a first fixing frame connected to the chassis; a second fixing frame connected to the chassis and arranged opposite to the first fixing frame, wherein, the driving member is connected to the first fixing frame, and the second tooling is connected to the second fixing frame.

4. The test device according to claim 1, wherein the tensile force sensor is connected between the driving member and the first tooling; or the tensile force sensor is integrated into the driving member.

5. The test device according to claim 1, wherein The driving member is a hydraulic driving device.

6. A method for testing the coefficient of friction, wherein the testing method uses the testing device described in any one of claims 1-5, characterized in that, The test method includes: assembling the sample to be tested including the first sample and the second sample, and obtaining the pressure value between the first sample and the second sample; installing the assembled sample to be tested on the first tooling and the second tooling; controlling the driving member to apply a gradually changing tensile force to the first tooling in a direction away from the second tooling; when the tensile force mutates or the first workpiece moves relative to the second workpiece, controlling the driving member to stop applying the tensile force and obtaining the tensile force value; determining the friction coefficient between the first workpiece and the second workpiece according to the tensile force value and the pressure value.

7. The test method according to claim 6, wherein the first sample and the second sample are respectively surface-treated and then assembled into the sample to be tested.

8. The test method according to claim 6, wherein the sample to be tested is connected to the first tooling by a first pin shaft, and the first pin shaft has an interference fit with the mating hole on the sample to be tested and the first tooling; the sample to be tested is connected to the second tooling by a second pin shaft, and the second pin shaft has an interference fit with the mating hole on the sample to be tested and the second tooling.

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