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

Abstract

The application 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 and wear performance test. The device comprises a magnetic field generating module, a magnetic attraction force closed-loop regulation and control system, a friction and wear test platform and an atmosphere environment control mechanism. The friction and wear test platform comprises a fretting friction and wear module and a sliding friction and wear module. The fretting friction and wear module and the sliding friction and wear module are respectively used for fretting friction and wear test and sliding friction and wear test of the sample to be tested. The atmosphere environment control mechanism is used for controlling the atmosphere environment of the sample to be tested. The application can solve the technical bottleneck that the traditional device cannot dynamically match the magnetic field and mechanical parameters, lacks multi-mode friction and wear test simulation and controllable atmosphere environment, significantly improves the reliability and applicability of test data, and provides technical support for the research on material friction and wear behavior under a complex magnetic field environment.

Description

Technical Field

[0001] This invention relates to the field of material friction and wear performance testing technology, and in particular to a controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device and method. Background Technology

[0002] With the rapid development of major national projects such as rail transit, aerospace, and electromagnetic catapults, key friction pairs of high-end equipment such as maglev train suspension frames, electromagnetic brakes, and magnetic drive bearings are constantly exposed to complex magnetic field environments. However, existing experimental equipment faces many technical bottlenecks in the study of the coupling between magnetic fields and frictional behavior.

[0003] Traditional static magnetic field loading devices cannot monitor the dynamic fluctuations of magnetic attraction in real time, causing experimental conditions to deviate from actual working conditions. Different magnetic materials exhibit significant differences in magnetic attraction under the same magnetic field, and existing technologies lack in-situ detection and closed-loop feedback mechanisms, making it difficult to achieve precise matching between magnetic field and mechanical parameters.

[0004] Furthermore, existing devices for friction and wear in magnetic fields are mostly limited to a single friction mode, lacking systematic research on different friction and wear modes. Existing devices cannot simulate the magnetic field-mechanical coupling effect under different friction modes, resulting in a lack of regular conclusions regarding key parameters (such as friction coefficient and wear rate).

[0005] Furthermore, the tribochemical oxidation behavior under magnetic field conditions is closely related to atmospheric conditions (oxygen concentration and humidity), but existing studies are mostly limited to atmospheric pressure air environments and lack the design of controllable atmosphere chambers. The regulatory mechanism of magnetic fields on tribochemical reactions under vacuum, inert gas, or different oxygen concentration environments has not yet been elucidated, resulting in a lack of theoretical support for predicting the service life of engineering materials in extreme environments. Summary of the Invention

[0006] To address the aforementioned problems, this invention aims to provide a controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device and method.

[0007] The technical solution of the present invention is as follows:

[0008] On the one hand, a controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device is provided, 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;

[0009] 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.

[0010] The friction and wear testing platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear testing platform uses the fretting friction and wear module, the test sample is subjected to a fretting friction and wear test; when the friction and wear testing platform uses the sliding friction and wear module, the test sample is subjected to a sliding friction and wear test.

[0011] The atmosphere environment control mechanism is used to control the atmosphere environment of the test sample.

[0012] Preferably, the magnetic field generating module includes an upper coil and a lower coil arranged coaxially opposite each other;

[0013] The magnetic attraction closed-loop control system includes a power loading unit, a transmission mechanism, a sensor, and a controller. 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 of the test specimen are mounted on the transmission mechanism. The controller is connected to the power loading unit and the sensor.

[0014] Preferably, the power loading unit is a servo motor loading unit, a hydraulic loading unit, or a pneumatic loading unit; the transmission mechanism is a screw drive mechanism.

[0015] The sensor is a force sensor, a pressure sensor, or a strain gauge. When the sensor is 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 test specimens, and the tangential force sensor is used to monitor the tangential force between the test specimens.

[0016] Preferably, a buffer device is provided between the normal force sensor and the transmission mechanism.

[0017] Preferably, the system also includes a vacuum electrode and a host computer, which are respectively connected to the controller. The vacuum electrode is electrically connected to the sensor to transmit the data collected by the sensor to the controller, and the host computer is used to receive the data from the controller.

[0018] Preferably, the micro-motion friction and wear module includes a connected micro-motion friction sample stage, a motor module one, and a grating displacement sensor disposed on the motor module one.

[0019] The sliding friction and wear module includes a sliding friction sample stage, a bidirectional lead screw, and a motor module connected in sequence. The sliding friction sample stage is equipped with a linear encoder that collects the displacement information of the sliding friction sample stage.

[0020] Preferably, the friction and wear test platform also includes a pin-disc friction and wear module. When the friction and wear test platform uses the pin-disc friction and wear module, the test sample is subjected to a pin-disc friction and wear test.

[0021] Preferably, the pin disc friction and wear module includes a pin disc friction sample stage, a commutator, and a motor module three connected in sequence. The motor module three is equipped with a rotary encoder for measuring the rotation angle and speed of the pin disc friction sample stage.

[0022] Preferably, the atmosphere control mechanism includes a vacuum chamber, a gas supply device, a vacuum system, and a gas analysis unit, all connected to the vacuum chamber.

[0023] A mass flow controller one is installed on the pipeline connecting the gas supply device to the vacuum chamber, and a mass flow controller two is installed on the pipeline connecting the vacuum system to the vacuum chamber.

[0024] On the other hand, a multi-mode micro-motion-sliding wear test method with controllable magnetic field and atmosphere is also provided, which uses the multi-mode micro-motion-sliding wear test device with controllable magnetic field and atmosphere described in any one of the above to conduct the test.

[0025] The beneficial effects of this invention are:

[0026] 1. This invention enables closed-loop control of magnetic attraction force: through in-situ detection and adaptive feedback adjustment, it corrects magnetic attraction force fluctuations in real time, ensuring that experimental conditions are consistent with actual working conditions. This solves the problem that traditional devices cannot dynamically match magnetic field and mechanical parameters, and significantly improves the reliability of experimental data.

[0027] 2. This invention can perform multi-mode friction and wear tests: It integrates three friction modes, namely micro-motion, sliding and even pin-disc, which can simulate friction behavior under different magnetic field-mechanical coupling effects, fill the gap of single-mode tests, and provide comprehensive support for multi-mode friction damage research.

[0028] 3. The atmosphere environment of this 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 conditions, providing a theoretical basis for predicting the service life of materials. The atmosphere environment is controlled by dynamic gas mixing technology. The flow rate of oxygen and inert gas can be accurately controlled by a proportional valve, thereby achieving precise regulation of the mixed gas concentration, avoiding unnecessary gas waste and improving gas utilization. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0030] Figure 1 This is a schematic diagram of the overall structure of the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention;

[0031] Figure 2 This is a three-dimensional structural schematic diagram of the main body of the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention;

[0032] Figure 3 This is a schematic diagram of the micro-motion friction and wear module of the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention;

[0033] Figure 4 This is a schematic diagram of the sliding friction and wear module of the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention;

[0034] Figure 5 This is a schematic diagram of the pin-disc friction and wear module of the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test device of the present invention;

[0035] Figure 6 This is a partial structural diagram of the transmission mechanism in a specific embodiment;

[0036] Figure 7 for Figure 6 A partial structural diagram after removing the lifting plate;

[0037] Figure 8 This is a partial structural diagram of the lower sample portion in a specific embodiment.

[0038] The following numbers are labeled in the diagram: 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 stage, 7a-Micro-motion friction sample stage, 7b-Sliding friction sample stage, 7c-Pin-disc friction sample stage, 8-Motor module, 8a-Motor module one, 8b-Motor module two, 8c-Motor module three, 9-Vacuum chamber, 10-Gas supply device, 11-Gas analysis unit, 12a-Mass flow controller one, 12b-Mass flow controller two, 13-Vacuum system, 14-Host computer, 15-Vacuum electrode, 16-Upper sample clamp, 17-Lower sample clamp, 18a-Grating displacement sensor, 18b-Linear encoder, 18c-Rotary encoder, 19-Bidirectional lead screw, 20-Commutator, 21-Slide assembly;

[0039] 301-Lifting plate, 302-Spring sheet one, 303-Sensor connecting block, 304-Spring sheet two, 305-Sensor adapter plate, 306-First limiting linear guide rail, 307-Iron core connecting plate, 308-Iron core, 309-Tangential force sensor connecting plate one, 310-Upper clamp, 311-Upper sample, 312-Spring sheet connecting frame, 313-Second limiting linear guide rail, 314-Electromagnetic coil, 315-Tangential sensor connecting plate two, 316-Third limiting linear guide rail, 317-First linear guide rail, 318-Moving end of linear guide rail. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and technical features described in this application can be combined with each other. It should also be pointed out that, unless otherwise indicated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms "comprising" or "including" and similar words used in this invention refer to elements or objects preceding the word that encompass the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0041] On the one hand, such as 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;

[0042] 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.

[0043] The friction and wear testing platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear testing platform uses the fretting friction and wear module, the test sample is subjected to a fretting friction and wear test; when the friction and wear testing platform uses the sliding friction and wear module, the test sample is subjected to a sliding friction and wear test.

[0044] The atmosphere environment control mechanism is used to control the atmosphere environment of the test sample.

[0045] In one specific embodiment, the magnetic field generating module includes an upper coil 1a and a lower coil 1b arranged coaxially 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, wherein the sensor is used to monitor changes in the magnetic attraction force; the power loading unit 2 is connected to the transmission mechanism 3, the upper coil 1a, the sensor, and the upper sample of the test sample are arranged on the transmission mechanism 3, and the controller 6 is connected to the power loading unit 2 and the sensor.

[0046] In the above embodiments, both the upper coil 1a and the lower coil 1b include an iron core and an electromagnetic coil surrounding the iron core. Optionally, the electromagnetic coil is wound with hollow copper wire, and the wire has a circulating water cooling channel. Continuous heat dissipation is achieved through an external cooling system, increasing the continuous working time. The water-cooled coil design can effectively reduce the temperature of the coil during operation, eliminating the need for frequent shutdowns for cooling during the experiment, thereby significantly improving the continuity and overall efficiency of the experiment 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, meeting the experimental requirements of alternating magnetic fields and static magnetic fields.

[0047] It should be noted that, in addition to using the electromagnetic coil described in the above embodiments to generate a magnetic field, a permanent magnet can also be used to generate a magnetic field. When using a permanent magnet, the strength and direction of the magnetic field can be adjusted by adjusting the position or angle of the permanent magnet; however, its flexibility is not as good as that of an electromagnetic coil, and it is more suitable for static magnetic field tests.

[0048] In one specific embodiment, the power loading unit 2 is a servo motor loading unit, a hydraulic loading unit, or a pneumatic loading unit; the transmission mechanism is a screw drive mechanism; the sensor is a force sensor, a pressure sensor, or a strain gauge. When the sensor is 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 test samples, and the tangential force sensor 5 is used to monitor the tangential force between the test samples.

[0049] In the above embodiments, when the normal force sensor 4 and the tangential force sensor 5 are set, 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 tangential plane of the contact surface.

[0050] In one specific embodiment, a buffer device is provided between the normal force sensor 4 and the transmission mechanism 3. Optionally, the buffer device is a spring sheet, which can absorb and disperse force fluctuations caused by impact or vibration during the test, reducing the impact of external interference on the measurement accuracy of the force sensor. When using this invention, the normal force sensor 4 monitors the normal force between the samples in real time, the tangential force sensor 5 monitors the tangential force between the samples 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 the output according to the instructions of the controller 6 to achieve closed-loop control of the magnetic attraction force.

[0051] In one specific embodiment, the device of the present invention further includes a vacuum electrode 15 and a host computer 14, both 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 used to receive data from the controller 6. It should be noted that, in addition to the sensor in the magnetic attraction closed-loop control system, the vacuum electrode 15 is also electrically connected to the sensors in the friction and wear testing platform and the atmosphere environment control mechanism.

[0052] In one specific embodiment, both the micro-motion friction and wear module and the sliding friction and wear module include a sample stage 7 and a motor module 8. Optionally, the micro-motion friction and wear module includes a connected micro-motion friction sample stage 7a, a motor module 8a, and a grating displacement sensor 18a disposed on the motor module 8a.

[0053] The sliding friction and wear module includes a sliding friction sample stage 7b, a bidirectional lead screw 19, and a motor module 8b connected in sequence. The sliding friction sample stage 7b is equipped with a linear encoder 18b for collecting displacement information of the sliding friction sample stage 7b.

[0054] Optionally, the motor module 8a employs a voice coil motor to achieve high-precision displacement control. The linear encoder 18b uses a magnetic grating displacement sensor.

[0055] In one specific embodiment, the sample stage 7 is equipped with a Hall sensor, which enables real-time monitoring of the magnetic field strength and direction changes at the sample contact interface.

[0056] In one specific embodiment, the friction and wear testing platform further includes a pin-disc friction and wear module. When the friction and wear testing platform uses the pin-disc friction and wear module, the test specimen is subjected to a pin-disc friction and wear test. Optionally, the pin-disc friction and wear module includes a pin-disc friction specimen stage 7c, a commutator 20, and a motor module 8c connected in sequence. The motor module 8c is equipped with a rotary encoder 18c for measuring the rotation angle and speed of the pin-disc friction specimen stage 7c.

[0057] In one 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, all connected to the vacuum chamber 9.

[0058] A mass flow controller 12a is provided on the pipeline connecting the gas supply device 10 and the vacuum chamber 9, and a mass flow controller 12b is provided on the pipeline connecting the vacuum system 13 and the vacuum chamber 9.

[0059] In one 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 using dynamic gas mixing technology, thereby achieving precise distribution of the gas composition within the vacuum chamber 9.

[0060] In one specific embodiment, the vacuum system 13 consists of a molecular pump and a mechanical pump, wherein the mechanical pump is used for initial vacuuming to quickly reduce the gas pressure inside the vacuum chamber 9; and the molecular pump is used to further pump the vacuum chamber 9 to a high vacuum state.

[0061] In one specific embodiment, the vacuum chamber 9 is made of acrylic, aluminum alloy, austenitic stainless steel, or other non-ferromagnetic materials to avoid interference from the magnetic field environment on the test accuracy. The vacuum chamber 9 can be a split structure or an integral dome structure. The split structure is easier to install and maintain, while the integral dome structure has better airtightness and structural stability. A bellows or rubber sleeve flexible sealing assembly can be set at the connection with the device to ensure airtightness while avoiding the introduction of additional torque.

[0062] In one specific embodiment, the vacuum chamber 9 is also equipped with a humidity sensor for real-time monitoring of the humidity inside the chamber. The humidity sensor is connected to a host computer 14, which controls the working status of the external humidifier and drying device through a controller 6 based on a preset humidity value and real-time monitored humidity data. The humidifying and drying gases are mixed through a three-way gas connector and then sent into the vacuum chamber 9 to achieve precise control of the humidity inside the vacuum chamber 9.

[0063] In a specific embodiment, such as Figure 6-7 As 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 support base and a motor base. An HMS40 open-type lead screw module is mounted on the support base. The slide assembly 21 of the HMS40 open-type lead screw module is connected to a concave lifting plate 301. From top to bottom, the groove of the lifting plate 301 contains, in sequence, a first spring plate 302, a sensor connecting block 303, a second spring plate 304, a normal force sensor 4, a sensor adapter plate 305, a first limiting linear guide rail 306, a core connecting plate 307, a core 308, a tangential force sensor connecting plate 309, an upper clamp 310, and an upper sample 311. The left and right ends of the first spring plate 302 and the second spring plate 304 are connected to the lifting plate 301 via a spring plate connecting bracket 312. The sensor adapter plate 305... The sensor adapter plate 305 is H-shaped, and its left and right ends are connected to the lifting plate via the second limiting linear guide rail 313. The first limiting linear guide rail 306, the iron core connecting plate 307, and at least part of the iron core 308 are disposed in the groove at the lower part of the sensor adapter plate 305. The first limiting linear guide rail 306 includes two limiting linear guide rails disposed on the same horizontal plane. An electromagnetic coil 314 is sleeved on the outer surface of the iron core 308. Two tangential sensors 5 are disposed on the same horizontal plane between the first tangential force sensor connecting plate 309 and the lifting plate 301. A second tangential sensor connecting plate 315 is disposed between the tangential sensor 5 and the lifting plate 301. Two third limiting linear guide rails 316 are disposed on the same vertical plane between the second tangential sensor connecting plate 315 and the lifting plate 301.

[0064] To prevent the lifting plate 301 from reciprocating in the left and right directions, optionally, a first linear guide rail 317 is provided on both the left and right sides of the lifting plate 301, and the first linear guide rail 317 is connected to the lifting plate 301 through the movable end 318 of the linear guide rail.

[0065] like Figure 8 As shown, the support base is also provided with a sample base. The sample base is provided with a guide rail base that is concave and has lugs extending horizontally at the bottom. Two parallel fourth limiting linear guide rails are provided in the groove of the guide rail base. A coil support is provided on the top of the fourth limiting linear guide rail. An iron core is provided on the top of the coil support. An electromagnetic coil is provided on the outer surface of the iron core to form a lower coil 1b. A lower sample base that is inverted L-shaped is provided on the top of the lower coil 1b. 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 limiting linear guide rail. A lower sample clamp is provided on the top of the lower sample base. 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.

[0066] It should be noted that the limiting linear guide, linear guide, normal force sensor, tangential force sensor, etc. are all existing technologies, and their specific structures will not be described in detail here.

[0067] On the other hand, the present invention also provides a multi-mode micro-motion-sliding wear test method with controllable magnetic field and atmosphere, wherein the test is conducted using the multi-mode micro-motion-sliding wear test device with controllable magnetic field and atmosphere described in any one of the above-mentioned methods.

[0068] In one specific embodiment, a sphere-plane pair configuration is used for testing, with the upper sample being a sphere and the lower sample being a planar block. This configuration exhibits excellent stability and repeatability, making it suitable for fundamental research on friction and wear under magnetic field environments. The method includes the following steps:

[0069] S1: Install 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 position of each shaft and fixture so that the center of the upper sample and the lower sample surface are in contact and the sample is not subjected to bending stress.

[0070] S2: Set up 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 and lower samples reaches the preset magnetic field strength.

[0071] S3: Calibration of magnetic attraction force: 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 up at a constant speed. Repeat the above operation three to four times. The normal force sensor 4 monitors the change process of the magnetic attraction force between the upper sample and the lower sample. The maximum desorption force minus the applied load is the magnetic attraction force value.

[0072] S4: Install friction and wear test specimens: Disconnect the connection between the electromagnetic coil and the external power supply, and install the demagnetized specimens in the upper specimen clamp 16 and the lower specimen clamp 17 respectively. Adjust the position of each shaft and clamp so that the center of the upper specimen and the lower specimen surface are in contact, and ensure that the specimen is not subjected to bending stress.

[0073] S5: Setting the atmosphere: After the vacuum chamber 9 is tightened, the vacuum chamber 9 is first evacuated to the preset vacuum level through the vacuum system 13, and then the test gas is introduced into the vacuum chamber 9 by the gas supply device 10 and adjusted by the mass flow controller 12a.

[0074] S6: Set 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.

[0075] S7: Test loading: Motor module 8 drives the corresponding sample stage 7, the micro-motion friction and wear module realizes the tangential relative motion between the upper and lower samples; the sliding friction and wear module realizes the reciprocating sliding motion between the upper and lower samples along the straight line; the pin-disc friction and wear module realizes the rotational relative motion between the upper and lower samples, wherein the lower sample rotates around a fixed axis while the upper sample remains stationary.

[0076] S8: Test force acquisition and feedback: The normal force sensor 4 and the tangential force sensor 5 measure the loading force and tangential friction force of the sample respectively. The sensors on the friction and wear test platform measure the displacement of the sample and other feedback signals, which are then transmitted to the host computer 14 to realize the test data storage and processing.

[0077] S9: Closed-loop control: The loading force and displacement feedback signals are compared with the given signal to obtain the error signal. The error signal is then adjusted by the PID controller and driven by the servo motor loading unit to drive the lead screw transmission mechanism, thereby realizing closed-loop control of the loading force to improve the test accuracy.

[0078] S10: Test Termination: The host computer 14 monitors the signals from each sensor to determine whether the sample has met the termination conditions set in the test, and the test stops.

[0079] S11: Sample Removal: After the test stops, the host computer 14 sends a signal to stop the gas supply device 10 and the mass flow controller 12a from working, disconnect the electromagnetic coil from the external power supply, remove the sample, and perform subsequent analysis and recording.

[0080] The above description is merely a representative embodiment of the present invention and is not intended to limit the present invention in any way. Any embodiment made by those skilled in the art without departing from the scope of the present invention and utilizing the disclosed technical content is an equivalent embodiment of the present invention. 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 scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device, characterized in that, Includes a magnetic field generating module, a magnetic attraction closed-loop control system, a friction and wear testing 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 magnetic field generating module includes an upper coil and a lower coil arranged coaxially opposite each other; The magnetic attraction closed-loop control system includes a power loading unit, a transmission mechanism, a sensor, and a controller. 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 of the test specimen are mounted on the transmission mechanism. The controller is connected to the power loading unit and the sensor. The friction and wear testing platform includes a fretting friction and wear module and a sliding friction and wear module. When the friction and wear testing platform uses the fretting friction and wear module, the test sample is subjected to a fretting friction and wear test; when the friction and wear testing platform uses the sliding friction and wear module, the test sample is subjected to a sliding friction and wear test. The atmosphere environment control mechanism is used to control the atmosphere environment of the test sample.

2. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 1, 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 drive mechanism. The sensor is a force sensor, a pressure sensor, or a strain gauge. When the sensor is 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 test specimens, and the tangential force sensor is used to monitor the tangential force between the test specimens.

3. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 2, characterized in that, A buffer device is provided between the normal force sensor and the transmission mechanism.

4. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 1, characterized in that, It also includes a vacuum electrode and a host computer, which are respectively connected to the controller. The vacuum electrode is electrically connected to the sensor to transmit the data collected by the sensor to the controller, and the host computer is used to receive the data from the controller.

5. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 1, characterized in that, The micro-motion friction and wear module includes a connected micro-motion friction sample stage, a motor module one, and a grating displacement sensor mounted on the motor module one. The sliding friction and wear module includes a sliding friction sample stage, a bidirectional lead screw, and a motor module connected in sequence. The sliding friction sample stage is equipped with a linear encoder that collects the displacement information of the sliding friction sample stage.

6. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 1, characterized in that, The friction and wear test platform also includes a pin-disc friction and wear module. When the friction and wear test platform uses the pin-disc friction and wear module, the test sample is subjected to a pin-disc friction and wear test.

7. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 6, characterized in that, The pin disc friction and wear module includes a pin disc friction sample stage, a commutator, and a motor module three connected in sequence. The motor module three is equipped with a rotary encoder for measuring the rotation angle and speed of the pin disc friction sample stage.

8. The controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear testing device according to claim 1, characterized in that, The atmosphere environment control mechanism includes a vacuum chamber, a gas supply device, a vacuum system, and a gas analysis unit, all connected to the vacuum chamber. A mass flow controller one is installed on the pipeline connecting the gas supply device to the vacuum chamber, and a mass flow controller two is installed on the pipeline connecting the vacuum system to the vacuum chamber.

9. A multi-mode micro-motion-sliding wear test method with controllable magnetic field and atmosphere, characterized in that, The test was conducted using the controllable magnetic field and atmosphere multi-mode micro-motion-sliding wear test apparatus as described in any one of claims 1-8.

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