Controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method

Abstract

The invention discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction wear performance test. The device comprises a magnetic field generation module, a magnetic attraction force closed-loop regulation and control system, a friction wear test platform and an atmosphere environment control mechanism, the friction-wear test platform comprises a fretting friction-wear module and a sliding friction-wear module, and the fretting friction-wear module and the sliding friction-wear module are respectively used for performing a fretting friction-wear test and a sliding friction-wear test on the to-be-tested sample; and the atmosphere environment control module is used for controlling the atmosphere environment where the to-be-tested sample is located. The device can solve the technical bottleneck that a traditional device cannot dynamically match a magnetic field and mechanical parameters and lacks multi-mode friction wear test simulation and a controllable atmosphere environment, the reliability and applicability of test data are remarkably improved, and technical support is provided for research of material friction wear behaviors in a complex magnetic field environment.

Description

Technical Field

[0001] The present invention relates to the technical field of material friction and wear performance testing, and in particular to a controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device and method. Background Art

[0002] With the rapid development of major national projects such as rail transit, aerospace, and electromagnetic catapults, critical friction pairs in high-end equipment like maglev train suspensions, electromagnetic brakes, and magnetic drive bearings are constantly exposed to complex magnetic field environments. However, existing testing equipment faces numerous technical bottlenecks in studying the coupling of magnetic field and friction behavior.

[0003] Conventional static magnetic field loading devices are unable to monitor the dynamic fluctuations of magnetic attraction in real time, resulting in a deviation between experimental conditions and actual working conditions. Materials with different magnetic properties exhibit significant variations in magnetic attraction under the same magnetic field. Existing technologies lack in-situ detection and closed-loop feedback mechanisms, making it difficult to precisely match magnetic field and mechanical parameters.

[0004] Furthermore, existing friction and wear devices in magnetic fields are often limited to a single friction mode, lacking systematic research on different friction and wear modes. Existing devices are unable to simulate the magnetic field-mechanical coupling effects under different friction modes, resulting in a lack of regular conclusions on key parameters such as friction coefficient and wear rate.

[0005] Furthermore, tribo-oxidation behavior in magnetic fields is closely related to atmospheric conditions (oxygen concentration and humidity), but existing research is largely limited to atmospheric pressure and lacks controllable atmosphere chamber designs. The mechanisms by which magnetic fields regulate tribochemical reactions in vacuum, inert gas, or at varying oxygen concentrations remain unexplored, resulting in a lack of theoretical support for predicting the service life of engineering materials in extreme environments. Summary of the Invention

[0006] In view of the above problems, the present invention aims to provide a multi-mode fretting-sliding wear testing device and method with controllable magnetic field and atmosphere.

[0007] The technical solutions of the present invention are as follows: On the one hand, a controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device is provided, which includes a magnetic field generating module, a magnetic attraction closed-loop control system, a friction and wear test platform, and an atmosphere environment control mechanism; The magnetic field generating module is used to generate a magnetic field, and the magnetic attraction closed-loop control system is used to perform closed-loop control of the magnetic attraction between the test samples; The friction and wear test platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear test platform adopts the fretting friction and wear module, the fretting friction and wear test is performed on the sample to be tested; when the friction and wear test platform adopts the sliding friction and wear module, the sliding friction and wear test is performed on the sample to be tested; The atmosphere control module is used to control the atmosphere of the sample to be tested.

[0008] Preferably, the magnetic field generating module comprises an upper coil and a lower coil coaxially arranged opposite to each other; The magnetic attraction closed-loop control system includes a power loading unit, a transmission mechanism, a sensor and a controller, wherein the sensor is used to monitor changes in the magnetic attraction force; the power loading unit is connected to the transmission mechanism, the upper coil, the sensor and the upper sample in the sample to be tested are arranged on the transmission mechanism, and the controller is connected to the power loading unit and the sensor.

[0009] Preferably, the power loading unit adopts a servo motor loading unit, a hydraulic loading unit or a pneumatic loading unit; the transmission mechanism adopts a screw transmission mechanism; The sensor adopts a force sensor, a pressure sensor or a strain gauge. When the sensor adopts a force sensor, the force sensor includes a normal force sensor and a tangential force sensor. The normal force sensor is used to monitor the normal force between the samples to be tested, and the tangential force sensor is used to monitor the tangential force between the samples to be tested.

[0010] Preferably, a buffer device is provided between the normal force sensor and the transmission mechanism.

[0011] Preferably, it further comprises a vacuum electrode and a host computer respectively connected to the controller, wherein the vacuum electrode is electrically connected to the sensor for transmitting data collected by the sensor to the controller, and the host computer is used to receive data from the controller.

[0012] Preferably, the fretting friction and wear module comprises a connected fretting friction sample table, a motor module 1, and a grating displacement sensor arranged on the motor module 1; The sliding friction wear module includes a sliding friction sample platform, a bidirectional screw and a second motor module connected in sequence. The sliding friction sample platform is provided with a linear encoder for collecting displacement information of the sliding friction sample platform.

[0013] Preferably, the friction and wear test platform further comprises a pin-on-disc friction and wear module. When the friction and wear test platform adopts the pin-on-disc friction and wear module, a pin-on-disc friction and wear test is performed on the sample to be tested.

[0014] Preferably, the pin-disk friction and wear module comprises a pin-disk friction sample table, a commutator and a motor module three connected in sequence, and the motor module three is provided with a rotary encoder for measuring the rotation angle and speed of the pin-disk friction sample table.

[0015] Preferably, the atmosphere control mechanism includes a vacuum chamber, a gas supply device, a vacuum system and a gas analysis unit respectively connected to the vacuum chamber; A mass flow controller 1 is provided on the pipeline connecting the gas supply device and the vacuum cavity, and a mass flow controller 2 is provided on the pipeline connecting the vacuum system and the vacuum cavity.

[0016] On the other hand, a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test method is also provided, and the test is performed using any of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear test devices described above.

[0017] The beneficial effects of the present invention are: 1. The present invention can perform closed-loop control of magnetic attraction: through in-situ detection and adaptive feedback adjustment, magnetic attraction fluctuations can be corrected in real time to ensure that experimental conditions are consistent with actual working conditions. This solves the problem that traditional devices cannot dynamically match magnetic fields and mechanical parameters, and significantly improves the reliability of test data.

[0018] 2. The present invention can conduct multi-mode friction and wear tests: it integrates three friction modes: micro-motion, sliding, and even pin-disk, and can simulate friction behaviors under different magnetic field-mechanical coupling effects, filling the shortcomings of single-mode tests and providing comprehensive support for multi-mode friction damage research.

[0019] 3. The atmosphere environment of the present invention is controllable: by setting up an atmosphere environment control mechanism, it can support adjustable environments such as vacuum, inert gas and oxygen concentration. Combined with real-time oxygen concentration monitoring, it can explore the friction oxidation behavior and chemical reaction mechanism under extreme environments, and provide a theoretical basis for the prediction of material service life; dynamic gas mixing technology is used to control the atmosphere environment, and the flow rate of oxygen and inert gas can be accurately controlled through the proportional valve, thereby realizing precise regulation of the concentration of the mixed gas, avoiding unnecessary gas waste, and improving gas utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1Schematic diagram of the overall structure of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the main part of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device of the present invention; Figure 3 Schematic diagram of the structure of the fretting friction and wear module of the multi-mode fretting-sliding wear testing device with controllable magnetic field and atmosphere according to the present invention; Figure 4 This is a schematic structural diagram of the sliding friction and wear module of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device of the present invention; Figure 5 This is a schematic structural diagram of the pin-disk friction and wear module of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device of the present invention; Figure 6 It is a schematic diagram of the partial structure of the transmission mechanism part in a specific embodiment; Figure 7 for Figure 6 Schematic diagram of the local structure after removing the lifting plate; Figure 8 It is a schematic diagram of the local structure of the lower sample part in a specific embodiment.

[0022] Reference numerals in the figure: 1a-upper coil, 1b-lower coil, 2-power loading unit, 3-transmission mechanism, 4-normal force sensor, 5-tangential force sensor, 6-controller, 7-sample platform, 7a-micro-friction sample platform, 7b-sliding friction sample platform, 7c-pin-disk friction sample platform, 8-motor module, 8a-motor module 1, 8b-motor module 2, 8c-motor module 3, 9-vacuum chamber, 10-gas supply device, 11-gas analysis unit, 12a-mass flow controller 1, 12b-mass flow controller 2, 13-vacuum system, 14-host computer, 15-vacuum electrode, 16-upper sample fixture, 17-lower sample fixture, 18a-grating displacement sensor, 18b-linear encoder, 18c-rotary encoder, 19-bidirectional lead screw, 20-commutator, 21-slide assembly; 301-lifting plate, 302-spring sheet 1, 303-sensor connecting block, 304-spring sheet 2, 305-sensor adapter plate, 306-first limit linear guide, 307-iron core connecting plate, 308-iron core, 309-tangential force sensor connecting plate 1, 310-upper fixture, 311-upper sample, 312-spring sheet connecting frame, 313-second limit linear guide, 314-electromagnetic coil, 315-tangential sensor connecting plate 2, 316-third limit linear guide, 317-first linear guide, 318-linear guide movable end. DETAILED DESCRIPTION

[0023] The present invention is further described below with reference to the accompanying drawings and examples. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those commonly understood by those of ordinary skill in the art to which this application belongs. The use of similar words such as "include" or "comprising" in the present invention means that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0024] On the one hand, if Figure 1-5 As shown, the present invention provides a controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device, including a magnetic field generating module, a magnetic attraction closed-loop control system, a friction and wear test platform, and an atmosphere environment control mechanism; The magnetic field generating module is used to generate a magnetic field, and the magnetic attraction closed-loop control system is used to perform closed-loop control of the magnetic attraction between the test samples; The friction and wear test platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear test platform adopts the fretting friction and wear module, the fretting friction and wear test is performed on the sample to be tested; when the friction and wear test platform adopts the sliding friction and wear module, the sliding friction and wear test is performed on the sample to be tested; The atmosphere control module is used to control the atmosphere of the sample to be tested.

[0025] In a specific embodiment, the magnetic field generating module includes an upper coil 1a and a lower coil 1b coaxially arranged opposite each other; the magnetic attraction closed-loop control system includes a power loading unit 2, a transmission mechanism 3, a sensor and a controller 6, and the sensor is used to monitor the changes in the magnetic attraction; the power loading unit 2 is connected to the transmission mechanism 3, the upper coil 1a, the sensor and the upper sample in the sample to be tested are arranged on the transmission mechanism 3, and the controller 6 is connected to the power loading unit 2 and the sensor.

[0026] In the above embodiment, the upper coil 1a and the lower coil 1b each include an iron core and an electromagnetic coil surrounding the iron core. Optionally, the electromagnetic coil is wound with a hollow copper wire, and a circulating water cooling channel is provided in the wire. Continuous heat dissipation is achieved through an external cooling system to increase continuous working time. The water-cooled coil design can effectively reduce the temperature of the coil during operation, which eliminates the need for frequent shutdowns for cooling during the test, thereby significantly improving the continuity and overall efficiency of the test and achieving stable magnetic field output. When using the magnetic field generating module, the magnetic field strength and direction changes at the sample contact interface can be precisely controlled by adjusting the output parameters of the external power supply to meet the experimental requirements of alternating magnetic fields and static magnetic fields.

[0027] It should be noted that, in addition to using the electromagnetic coils described in the above embodiments to generate magnetic fields, permanent magnets can also be used to generate magnetic fields. When using permanent magnets, the magnetic field strength and direction can be adjusted by adjusting the position or angle of the permanent magnets. However, these methods are less flexible than electromagnetic coils and are more suitable for static magnetic field tests.

[0028] In a specific embodiment, the power loading unit 2 adopts a servo motor loading unit, a hydraulic loading unit or a pneumatic loading unit; the transmission mechanism adopts a screw transmission mechanism; the sensor adopts a force sensor, a pressure sensor or a strain gauge. When the sensor adopts a force sensor, the force sensor includes a normal force sensor 4 and a tangential force sensor 5. The normal force sensor 4 is used to monitor the normal force between the samples to be tested, and the tangential force sensor 5 is used to monitor the tangential force between the samples to be tested.

[0029] In the above embodiment, when the normal force sensor 4 and the tangential force sensor 5 are provided, the axis of the normal force sensor coincides with the normal vector of the sample contact surface, and the axis of the tangential force sensor is parallel to the tangent plane of the contact surface.

[0030] In one specific embodiment, a buffer device is provided between the normal force sensor 4 and the transmission mechanism 3. Optionally, the buffer device utilizes a leaf spring, which can absorb and disperse force fluctuations caused by impact or vibration during the test, thereby reducing the impact of external interference on the force sensor's measurement accuracy. When using the present invention, the normal force sensor 4 monitors the normal force between the specimens in real time, while the tangential force sensor 5 monitors the tangential force between the specimens in real time. The controller 6 runs an adaptive control algorithm based on the data collected by the force sensor group, and the servo motor loading unit adjusts its output according to the instructions of the controller 6, thereby achieving closed-loop control of the magnetic attraction force.

[0031] In a specific embodiment, the apparatus of the present invention further includes a vacuum electrode 15 and a host computer 14, each connected to the controller 6. The vacuum electrode 15 is electrically connected to the sensor for transmitting data collected by the sensor to the controller 6, and the host computer 14 is configured to receive data from the controller 6. It should be noted that, in addition to the sensors in the magnetic attraction closed-loop control system, the vacuum electrode 15 is also electrically connected to sensors in the friction and wear test platform and the atmosphere environment control mechanism.

[0032] In a specific embodiment, the fretting friction and wear module and the sliding friction and wear module both include a sample table 7 and a motor module 8. Optionally, the fretting friction and wear module includes a connected fretting friction sample table 7a, a motor module 1 8a, and a grating displacement sensor 18a disposed on the motor module 1 8a; The sliding friction wear module includes a sliding friction sample platform 7b, a bidirectional screw 19 and a motor module 2 8b connected in sequence. The sliding friction sample platform 7b is provided with a linear encoder 18b for collecting displacement information of the sliding friction sample platform 7b.

[0033] Optionally, the motor module 1 8a uses a voice coil motor to achieve high-precision displacement control. The linear encoder 18b uses a magnetic grating displacement sensor.

[0034] In a specific embodiment, a Hall sensor is provided on the sample stage 7 so that the magnetic field intensity and direction changes at the sample contact interface can be monitored in real time.

[0035] In a specific embodiment, the friction and wear test platform further includes a pin-on-disk friction and wear module. When the pin-on-disk friction and wear module is used, the pin-on-disk friction and wear test is performed on the test specimen. Optionally, the pin-on-disk friction and wear module includes a pin-on-disk friction specimen platform 7c, a commutator 20, and a third motor module 8c, which are connected in sequence. The third motor module 8c is equipped with a rotary encoder 18c for measuring the rotation angle and speed of the pin-on-disk friction specimen platform 7c.

[0036] In a specific embodiment, the atmosphere environment control mechanism includes a vacuum chamber 9, a gas supply device 10, a vacuum system 13 and a gas analysis unit 11 respectively connected to the vacuum chamber 9; A mass flow controller 12 a is provided on the pipeline connecting the gas supply device 10 and the vacuum chamber 9 , and a mass flow controller 2 12 b is provided on the pipeline connecting the vacuum system 13 and the vacuum chamber 9 .

[0037] In a specific embodiment, the gas analysis unit 11 integrates an oxygen concentration sensor and an ionization gauge to monitor the oxygen concentration and vacuum level within the vacuum chamber 9. The mass flow controller 12a includes a proportional valve that adjusts the flow ratio of oxygen and inert gas through dynamic gas mixing technology, thereby achieving precise adjustment of the gas composition within the vacuum chamber 9.

[0038] In a specific embodiment, the vacuum system 13 is composed of a molecular pump and a mechanical pump, wherein the mechanical pump is used for initial vacuuming to quickly reduce the air pressure in the vacuum chamber 9; the molecular pump is used to further evacuate the vacuum chamber 9 to a high vacuum state.

[0039] In a specific embodiment, the vacuum chamber 9 is made of acrylic, aluminum alloy, austenitic stainless steel, or other non-ferromagnetic materials to prevent interference with the test accuracy caused by the magnetic field environment. The vacuum chamber 9 can be a split-type structure or a monolithic cover-type structure. The split-type structure facilitates installation and maintenance, while the monolithic cover-type structure provides better airtightness and structural stability. A bellows or rubber holster flexible sealing assembly can be installed at the connection with the device to ensure airtightness while avoiding the introduction of additional torque.

[0040] In a specific embodiment, the vacuum cavity 9 is further equipped with a humidity sensor for real-time monitoring of the humidity in the cavity; the humidity sensor is connected to the host computer 14, and the host computer 14 controls the working status of the external humidifier and the drying device through the controller 6 according to the preset humidity value and the real-time monitored humidity data; the humidified and dried gases are mixed and sent into the vacuum cavity 9 through the three-way gas connector to achieve precise control of the humidity in the vacuum cavity 9.

[0041] In a specific embodiment, Figure 6-7As shown, the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention includes an integrally formed or separate bracket base and a motor base, and the bracket base is provided with an HMS40 open screw module, and the slide assembly 21 of the HMS40 open screw module is connected to the "concave" lifting plate 301, and the groove of the lifting plate 301 is provided with a spring piece 1 302, a sensor connecting block 303, a spring piece 2 304, a normal force sensor 4, a sensor adapter plate 305, a first limiting linear guide 306, an iron core connecting plate 307, an iron core 308, a tangential force sensor connecting plate 1 309, an upper fixture 310, and an upper sample 311. The left and right ends of the spring piece 1 302 and the spring piece 2 304 are connected to the lifting plate 301 through a spring piece connecting frame 312, and the sensor adapter plate 305 is provided in sequence from top to bottom. It is "H"-shaped, and the left and right ends of the sensor adapter plate 305 are connected to the lifting plate through the second limiting linear guide 313. The first limiting linear guide 306, the iron core connecting plate 307 and at least part of the iron core 308 are arranged in the groove at the bottom of the sensor adapter plate 305. The first limiting linear guide 306 includes two limiting linear guides arranged in the same horizontal plane. The outer surface of the iron core 308 is sleeved with an electromagnetic coil 314. Two tangential sensors 5 in the same horizontal plane are provided between the tangential force sensor connecting plate 1 309 and the lifting plate 301, and a tangential sensor connecting plate 2 315 is provided between the tangential sensor 5 and the lifting plate 301. Two third limiting linear guides 316 in the same vertical plane are provided between the tangential sensor connecting plate 2 315 and the lifting plate 301.

[0042] In order to prevent the lifting plate 301 from reciprocating in the left and right directions, optionally, first linear guide rails 317 are provided on both the left and right sides of the lifting plate 301 , and the first linear guide rails 317 are connected to the lifting plate 301 via linear guide rail movable ends 318 .

[0043] like Figure 8 As shown, a sample base is also provided on the bracket base, and a guide rail base is provided on the sample base, which is "concave" shaped and has a support ear extending horizontally at the bottom. Two fourth limit linear guide rails are arranged in parallel in the groove of the guide rail base, and a coil bracket is provided on the top of the fourth limit linear guide rail. The top of the coil bracket is provided with an iron core, and the outer surface of the iron core is provided with an electromagnetic coil to form a lower coil 1b. The top of the lower coil 1b is provided with an inverted L-shaped lower sample base, and the left and right ends of the lower surface of the lower sample base are connected to the left and right ends of the top of the guide rail base through the fifth limit linear guide rail. A lower sample clamp is provided on the top of the lower sample base, and a lower sample is provided on the lower sample clamp. The side wall of the lower sample base is connected to the motor module 8.

[0044] It should be noted that the limiting linear guide rail, linear guide rail, normal force sensor, tangential force sensor, etc. are all existing technologies, and the specific structures will not be repeated here.

[0045] On the other hand, the present invention also provides a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test method, which uses any of the controllable magnetic field and atmosphere multi-mode fretting-sliding wear test devices described above to perform the test.

[0046] In a specific embodiment, a sphere-plane pairing method is used for testing, in which the upper specimen is a sphere and the lower specimen is a flat block. This configuration has excellent test stability and repeatability and is suitable for basic research on friction and wear in a magnetic field environment. The method includes the following steps: S1: Install the magnetic force calibration sample: Remove the vacuum chamber and install the demagnetized sample in the upper sample fixture 16 and the lower sample fixture 17 respectively. Adjust the positions of the shafts and fixtures so that the center of the upper sample and the lower sample surface are in contact and ensure that the sample is not affected by bending stress. S2: Setting the magnetic field environment: The electromagnetic coil is connected to an external power supply to form a closed loop. By adjusting the output parameters of the power supply, the contact interface between the upper sample and the lower sample reaches the preset magnetic field strength; S3: Calibrate magnetic attraction: The servo motor loading unit controls the upper sample to reach a certain contact pressure with the lower sample under a fixed load, and then lifts it upward at a constant speed. This operation is repeated three to four times. The normal force sensor 4 monitors the change in the magnetic attraction between the upper and lower samples. The maximum desorption force minus the applied load is the magnetic attraction value. S4: Installing the friction and wear test specimen: Disconnect the electromagnetic coil from the external power supply, install the demagnetized specimen in the upper specimen fixture 16 and the lower specimen fixture 17, respectively, and adjust the positions of the shafts and fixtures so that the centers of the upper and lower specimen surfaces are in contact, and ensure that the specimens are not subjected to bending stress. S5: Setting the atmosphere: After the vacuum chamber 9 is tightened, the vacuum chamber 9 is first evacuated to a preset vacuum level through the vacuum system 13. Then, the test gas is introduced into the vacuum chamber 9 through the gas supply device 10 and regulated by the mass flow controller 12a. S6: Setting test parameters: Repeat step S2, and set the loading parameters, friction and wear test motion parameters and test termination conditions in the host computer 14 according to the measured magnetic attraction force; S7: Test loading: The motor module 8 drives the corresponding sample stage 7. The micro-motion friction and wear module realizes the tangential relative motion of the upper sample and the lower sample; the sliding friction and wear module realizes the reciprocating sliding motion of the upper sample and the lower sample along the linear direction; the pin-disk friction and wear module realizes the rotational relative motion of the upper sample and the lower sample, wherein the lower sample rotates around the fixed axis and the upper sample remains stationary; S8: Test force acquisition and feedback: The normal force sensor 4 and the tangential force sensor 5 respectively measure the loading force and tangential friction force of the sample. The sensor on the friction and wear test platform measures the displacement of the sample and other feedback signals are transmitted to the host computer 14 to realize test data storage and processing; S9: Closed-loop control: The loading force and displacement feedback signals are compared with the given signals to obtain an error signal, which is then adjusted by the PID regulator and output, and the servo motor loading unit drives the screw transmission mechanism to achieve closed-loop control of the loading force to improve test accuracy. S10: Test termination: The host computer 14 determines whether the sample has reached the termination condition set by the test by monitoring the signals of each sensor, and the test stops; S11: Take out the sample: After the test stops, the host computer 14 sends a signal, the gas supply device 10 and the mass flow controller 12a stop working, cut off the connection between the electromagnetic coil and the external power supply, take out the sample and perform subsequent analysis and recording.

[0047] The above description is merely a representative embodiment of the present invention and does not constitute any form of limitation to the present invention. Any technical personnel familiar with the present invention who, without departing from the scope of the technical solution of the present invention, makes some changes or modifications to the embodiments disclosed above using the technical contents disclosed above are equivalent embodiments of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-mode fretting-sliding wear test device with controllable magnetic field and atmosphere, characterized in that: It includes a magnetic field generating module, a magnetic attraction closed-loop control system, a friction and wear test platform, and an atmosphere environment control mechanism; The magnetic field generating module is used to generate a magnetic field, and the magnetic attraction closed-loop control system is used to perform closed-loop control of the magnetic attraction between the test samples; The friction and wear test platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear test platform adopts the fretting friction and wear module, the fretting friction and wear test is performed on the sample to be tested; when the friction and wear test platform adopts the sliding friction and wear module, the sliding friction and wear test is performed on the sample to be tested; The atmosphere control module is used to control the atmosphere of the sample to be tested.

2. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 1, characterized in that: The magnetic field generating module comprises an upper coil and a lower coil which are coaxially arranged opposite to each other; The magnetic attraction closed-loop control system includes a power loading unit, a transmission mechanism, a sensor and a controller, wherein the sensor is used to monitor changes in the magnetic attraction force; the power loading unit is connected to the transmission mechanism, the upper coil, the sensor and the upper sample in the sample to be tested are arranged on the transmission mechanism, and the controller is connected to the power loading unit and the sensor.

3. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 2, characterized in that: The power loading unit adopts a servo motor loading unit, a hydraulic loading unit or a pneumatic loading unit; the transmission mechanism adopts a screw transmission mechanism; The sensor adopts a force sensor, a pressure sensor or a strain gauge. When the sensor adopts a force sensor, the force sensor includes a normal force sensor and a tangential force sensor. The normal force sensor is used to monitor the normal force between the samples to be tested, and the tangential force sensor is used to monitor the tangential force between the samples to be tested.

4. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 3, characterized in that: A buffer device is provided between the normal force sensor and the transmission mechanism.

5. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 2, characterized in that: It also includes a vacuum electrode and a host computer respectively connected to the controller. The vacuum electrode is electrically connected to the sensor for transmitting data collected by the sensor to the controller, and the host computer is used to receive data from the controller.

6. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 1, characterized in that: The fretting friction and wear module includes a connected fretting friction sample table, a motor module 1, and a grating displacement sensor arranged on the motor module 1; The sliding friction wear module includes a sliding friction sample platform, a bidirectional screw and a second motor module connected in sequence. The sliding friction sample platform is provided with a linear encoder for collecting displacement information of the sliding friction sample platform.

7. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 1, characterized in that: The friction and wear test platform further comprises a pin-on-disc friction and wear module. When the friction and wear test platform adopts the pin-on-disc friction and wear module, a pin-on-disc friction and wear test is performed on the sample to be tested.

8. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 7, characterized in that: The pin-disk friction and wear module includes a pin-disk friction sample table, a commutator and a motor module three connected in sequence. The motor module three is provided with a rotary encoder for measuring the rotation angle and speed of the pin-disk friction sample table.

9. The controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device according to claim 1, characterized in that: The atmosphere control mechanism includes a vacuum chamber, a gas supply device, a vacuum system and a gas analysis unit respectively connected to the vacuum chamber; A mass flow controller 1 is provided on the pipeline connecting the gas supply device and the vacuum cavity, and a mass flow controller 2 is provided on the pipeline connecting the vacuum system and the vacuum cavity.

10. A multi-mode fretting-sliding wear test method with controllable magnetic field and atmosphere, characterized in that: The test is carried out using the controllable magnetic field and atmosphere multi-mode fretting-sliding wear testing device described in any one of claims 1 to 9.

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