High-temperature liquid environment impact-tangential multi-mode fretting wear test method and device

Abstract

The invention discloses a high-temperature liquid environment impact-tangential multi-mode fretting wear test method and device. The device comprises an optical platform, a gas supply device, and an impact loading mechanism, a tangential movement mechanism, a test kettle, a test crucible and a liquid storage kettle which are mounted on the optical platform, the impact loading mechanism comprises an impact loading voice coil motor module, an impact shaft and an impact shaft supporting assembly; the tangential movement mechanism comprises a tangential movement voice coil motor module, a tangential shaft and a tangential shaft supporting assembly; and a test kettle cover and a liquid storage kettle cover are respectively arranged on the test kettle and the liquid storage kettle. According to the testing machine, various contact modes can be tested, the displacement adjustable range of the impact loading module and the tangential motion module is larger than that of an existing testing machine in the industry, the testing mode can cover the micro-motion and sliding range, and the application range is wider; various liquid environments such as liquid lead bismuth and water in the nuclear power field can be simulated, and meanwhile the temperature and the oxygen content in the environments can be regulated and controlled.

Description

Technical Field

[0001] The invention relates to a high-temperature liquid environment impact-tangential multi-mode fretting wear test method and a device thereof, belonging to the technical field of fretting wear test. Background Art

[0002] Fretting wear refers to the relative displacement of the contact surface caused by the external vibration of the contact pair. The contact pair itself only bears local contact loads or fixed prestress. Tangential fretting wear is a type of fretting wear. It is widely found in the fields of nuclear industry, electric power, chemical industry, mining machinery, aerospace, etc., resulting in huge energy consumption and huge losses to national property safety and the national economy. However, in the actual operation of many types of machinery, parts are not only subjected to tangential wear, but also impact wear. This type of wear refers to the surface damage caused by repeated dynamic contact and collision between the surfaces of two solids, which will aggravate the wear process of parts.

[0003] Nuclear power plants based on pressurized water reactors are the most widely used reactor types in the world. Many structural damage accidents inside them are directly related to micromotion damage. The world-famous Chernobyl nuclear accident in the Soviet Union and the Fukushima nuclear accident in Japan both used this type of reactor. Therefore, research on improving the stability of this type of reactor cannot be underestimated. At the same time, with the introduction of the fourth-generation nuclear power technology, the nuclear power field has gradually paid attention to the miniaturization of reactors and the corresponding cooling methods. Among them, lead-cooled fast reactors have received widespread attention due to their excellent safety performance and high fuel cycle efficiency. Safety is an important issue in the development of nuclear energy. Nuclear power equipment operates in a fluid medium environment. Micromotion damage is prevalent in the entire system, from fuel assemblies, control rod drive mechanisms, cooling main pump shafts, steam generators to pipes, flanges, bolts, etc. Moreover, nuclear power equipment operates in extreme environments of high temperature, high pressure, and irradiation, so the micromotion behavior of the structure in the nuclear energy environment has attracted much attention.

[0004] The existing micro-motion wear testers on the market have a low degree of automation and can generally only perform micro-motion tests in a single mode. However, in actual working conditions, the micro-motion wear of parts is the result of a combination of multiple modes. In addition, the environment in which the structure is placed under nuclear power is extreme and complex. At present, the micro-motion research in extreme environments (high temperature, special liquid environment, etc.) is greatly restricted by the micro-motion test equipment that can achieve the required extreme environment, so this test equipment and test method were developed. Summary of the invention

[0005] In order to overcome the defects in the prior art, the present invention aims to provide a high-temperature liquid environment impact-tangential multi-mode fretting wear test method and device.

[0006] The technical solution provided by the present invention to solve the above technical problems is: a high-temperature liquid environment impact-tangential multi-mode micro-motion wear test device, comprising an optical platform, an air supply device, and an impact loading mechanism installed on the optical platform, a tangential motion mechanism, a test kettle, a test crucible, and a liquid storage kettle;

[0007] The impact loading mechanism comprises an impact loading voice coil motor module, an impact shaft, and two impact shaft support assemblies. The two ends of the impact shaft respectively pass through the test kettle and are slidably mounted on the two impact shaft support assemblies, and one end of the impact shaft is connected to the output end of the impact loading voice coil motor module.

[0008] The tangential motion mechanism comprises a tangential motion voice coil motor module, a tangential shaft, and two tangential shaft support assemblies; two ends of the tangential shaft respectively pass through the test kettle and are slidably mounted on the two tangential shaft support assemblies, and one end of the tangential shaft is connected to the output end of the tangential motion voice coil motor module;

[0009] The test crucible is installed in the test kettle, the impact shaft has an impact concave section located in the test kettle, the tangential shaft has a tangential concave section located in the test kettle and above the impact concave section, and the impact concave section and the tangential concave section are respectively provided with an upper sample fixture and a lower sample fixture;

[0010] The liquid storage kettle is connected with the bottom of the test crucible through a pipeline. The height design between the liquid storage kettle and the test crucible is based on the principle of communicating vessels. Under normal pressure, the liquid inside the test crucible can completely flow back to the liquid storage kettle. The test kettle and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover. The test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device.

[0011] A further technical solution is that four lateral flanges are evenly distributed on the inner wall of the test kettle, a bellows is provided on the lateral flange, the impact shaft and the tangential shaft pass through the lateral flange and the bellows respectively, and the impact shaft and the tangential shaft are provided with connecting flanges connected to the end faces of the bellows.

[0012] A further technical solution is that a ceramic heating blanket for heating the test crucible is provided at the bottom of the test kettle; an insulating kettle for insulating and heat-preserving the liquid storage kettle is provided on the optical platform, and a heating blanket for heating the liquid storage kettle is provided inside the insulating kettle.

[0013] A further technical solution is that a test kettle cover lifting mechanism and a liquid storage kettle cover lifting mechanism are provided on the optical platform, and the test kettle cover lifting mechanism and the liquid storage kettle cover lifting mechanism are connected to the test kettle cover and the liquid storage kettle cover respectively.

[0014] A further technical solution is that a kettle cover height adaptive adjustment device is provided between the test kettle cover lifting mechanism and the test kettle cover, and between the liquid storage kettle cover lifting mechanism and the liquid storage kettle cover.

[0015] A further technical solution is that an impact buffer device and a tangential buffer device are respectively provided between the impact axis and the impact-loaded voice coil motor module, and between the tangential axis and the tangential motion voice coil motor module.

[0016] A further technical solution is that the number of the impact shaft support assembly and the tangential shaft support assembly are both two, which are arranged relatively on the outer wall of the test kettle.

[0017] A further technical solution is that the impact shaft support assembly includes a receiving block, two linear sliders and a support seat, the two linear sliders are slidably installed on the upper end surface of the support seat, and the receiving block is fixed on the two linear sliders; four through holes are provided inside the receiving block, a V-shaped groove is provided on the upper end surface, and heat dissipation blocks are installed on both sides and the top.

[0018] A further technical solution is that the impact loading mechanism and the tangential motion mechanism are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and the test kettle is also provided with an oxygen sensor. The micro-motion wear test device also includes a host computer and an electronic control system electrically connected to the host computer, and the electronic control system is electrically connected to the pressure sensor, the grating displacement sensor, and the oxygen sensor, respectively.

[0019] A high temperature liquid environment impact-tangential multi-mode fretting wear test method comprises the following steps:

[0020] Step 1. Install the sample: remove the test kettle cover, and then install the sample in the upper sample fixture and the lower sample fixture respectively, adjust the position of each shaft and the fixture so that the upper and lower samples are in contact, and ensure that the sample is not affected by bending stress;

[0021] Step 2, setting the environment: After the test kettle lid and the liquid storage kettle lid are tightened, the liquid is heated to the required temperature, the liquid in the liquid storage kettle is pressed into the test crucible through the air inlet pipe, and then the pipeline valve is closed, and then the oxygen content in the test kettle is adjusted according to the requirements through the air supply device;

[0022] Step 3, set the test parameters: set the impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer;

[0023] Step 4, test loading: the impact loading voice coil motor module and the tangential motion voice coil motor module drive the corresponding impact axis and tangential axis respectively, the impact axis realizes the impact action of the upper and lower samples, and the tangential axis realizes the tangential relative motion of the upper and lower samples;

[0024] Step 5, test force collection and feedback: the grating displacement sensor and pressure sensor on the impact axis measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis measure the tangential friction force and displacement of the sample. The loading force, displacement, friction force and other loading force feedback signals are transmitted to the host computer to realize test data storage and processing;

[0025] Step 6, loading control: The loading force and displacement feedback signals are compared with the given signals to obtain a primary error signal, which is adjusted by the PID regulator and output, and the driver drives the tangential axis and / or impact axis to achieve closed-loop control of the loading force to improve the test accuracy;

[0026] Step 7, test termination: the host computer determines whether the sample has reached the termination condition set by the test by monitoring the signals of each sensor, and the test stops;

[0027] Step 8, take out the sample: After the test stops, the host computer sends a signal, the gas supply device stops supplying gas, the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the connecting vessel, and the valve between the test kettle and the liquid storage kettle is closed. Wait until the temperature returns to room temperature before taking out the sample.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention can simulate a variety of liquid environments in the nuclear power field, such as liquid lead, bismuth, water, etc., and can also regulate the temperature and oxygen content in the environment;

[0030] 2. Compared with the traditional wear test equipment, the present invention can realize the friction and wear test of the friction pair in three different operation modes of impact, tangential or punching and shearing by changing the operation between the two shafts;

[0031] 3. Based on the multi-channel acquisition system, the loading force, displacement and other data in the test process can be measured and recorded in real time, and the interface response data such as friction coefficient, wear amount and dissipated energy in the test can be displayed in real time on the host computer, providing more comprehensive data for studying the friction and wear damage mechanism;

[0032] 4. The present invention can test various forms of contact (such as contact between cylindrical surfaces, contact between cylindrical surfaces and plane surfaces, contact between spherical surfaces and plane surfaces, contact between plane surfaces and plane surfaces, etc.). At the same time, the adjustable displacement range of the impact loading module and the tangential motion module is larger than that of the existing testing machines in the industry. The test mode can cover the micro-motion and sliding ranges, and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2It is a front view of the test, liquid storage and driving device of the present invention;

[0035] Figure 3 is a top view of the test, liquid storage and driving device of the present invention;

[0036] Figure 4 It is a left side view of the test, liquid storage and driving device of the present invention;

[0037] Figure 5 A three-dimensional diagram of the support assembly;

[0038] Figure 6 A three-dimensional diagram of the impact buffer device;

[0039] Figure 7 is a three-dimensional diagram of the impact axis;

[0040] Figure 8 is the three-dimensional graph of the tangential axis;

[0041] Fig. 9 It is a three-dimensional diagram of the lifting mechanism;

[0042] Fig.10 is a three-dimensional diagram of the tangential buffer device;

[0043] Fig.11 is a three-dimensional diagram of the upper specimen fixture;

[0044] Fig.12 A three-dimensional diagram of the lower specimen fixture.

[0045] As shown in the figure: 1-test kettle cover lifting mechanism, 2-impact loading mechanism, 3-liquid storage kettle cover lifting mechanism, 4-gas supply device, 5-tangential motion mechanism, 6-test kettle, 7-optical platform, 8-liquid storage kettle, 9-electronic control system, 10-host computer, 11-impact loading voice coil motor module, 12-impact shaft, 13-tangential motion voice coil motor module, 14-tangential shaft, 15-test crucible, 16-upper sample fixture, 17-lower sample fixture, 18-pipeline, 19-pipeline valve, 20-lateral flange, 21-bellows, 22-ceramic heating blanket, 23-radiator, 24-adapter plate, 25-buffered linear bearing, 26-plug screw, 27-upper sample, 28-lower sample, 29-receiving block, 30-linear slider, 31-support seat, 32-through hole, 33-V-shaped slide groove, 34-heat dissipation block, 35-insulating kettle. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1-Figure 12 As shown, a high-temperature liquid environment impact-tangential multi-mode micro-motion wear test device of the present invention includes an optical platform 7, an air supply device 4, a host computer 10, and an electric control system 9 electrically connected to the host computer 10, and an impact loading mechanism 2, a tangential motion mechanism 5, a test kettle 6, a test crucible 15, and a liquid storage kettle 8 installed on the optical platform 7;

[0048] The impact loading mechanism 2 includes an impact loading voice coil motor module 11, an impact shaft 12, and two impact shaft support assemblies. The impact shaft 12 is installed in the test kettle 6, and both ends pass through the test kettle 6 and are slidably installed on the two impact shaft support assemblies, one end of which is connected to the output end of the impact loading voice coil motor module 11 extending outside the impact shaft support assembly;

[0049] The tangential motion mechanism 5 includes a tangential motion voice coil motor module 13, a tangential shaft 14, and two tangential shaft support assemblies; the tangential shaft 14 is installed in the test kettle 6, and its two ends respectively pass through the test kettle 6 and are slidably installed on the two tangential shaft support assemblies, and one end thereof extends outside the tangential shaft support assembly to be connected to the output end of the tangential motion voice coil motor module 13;

[0050] The impact shaft support assembly and the tangential shaft support are arranged relatively on the outer wall of the test kettle 6;

[0051] The test crucible 15 is installed in the test kettle 6, the impact shaft 12 has an impact concave section located in the test kettle 15, the tangential shaft 14 has a tangential concave section located in the test kettle 15 and above the impact concave section, and the impact concave section and the tangential concave section are respectively provided with an upper sample fixture 16 and a lower sample fixture 17;

[0052] The side of the liquid storage kettle 8 is connected to the bottom of the test crucible 15 through a pipeline 18, and a pipeline valve 19 is provided on the pipeline 18. The pipeline 18 between the test crucible 15 and the liquid storage kettle 8 is based on the principle of a communicating vessel. The height of the bottom of the test crucible 15 is flush with the set height of the liquid storage kettle 8, so that under atmospheric pressure, the liquid can automatically flow back to the liquid storage kettle 8;

[0053] In order to prevent the liquid from solidifying due to the decrease in temperature in the pipe 18, a ceramic heating blanket is wrapped around the pipe 18 to maintain the liquid state;

[0054] The test kettle 6 and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover, and the test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device 4;

[0055] The impact loading mechanism 2 and the tangential motion mechanism 5 are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and the test kettle 6 is also provided with an oxygen sensor. The electronic control system 9 is electrically connected to the pressure sensor, the grating displacement sensor, and the oxygen sensor, respectively, and the electronic control system transmits the data of each sensor to the host computer 10.

[0056] In the present invention, two samples are respectively mounted in an upper sample fixture 16 and a lower sample fixture 17, and then the impact-loading voice coil motor module 11 drives the impact shaft 12 to perform impact motion, and the tangential motion voice coil motor module 13 drives the tangential shaft 14 to perform tangential motion;

[0057] The impact axis 12 and the tangential axis 14 are independent of each other, and both are driven by voice coil motors, which can generate various forms of motion such as sine waves, triangle waves, trapezoidal waves, rectangular waves, etc. During the test, the action modes of the impact loading module and the tangential motion module can be controlled according to different test requirements to realize impact, tangential or coupled test modes.

[0058] Controlling the operating status of the two axes can achieve a variety of test modes:

[0059] 1) Control the impact axis 12 to apply a constant load to the sample, and the tangential axis 14 gives the sample a certain movement form to realize the tangential test mode;

[0060] 2) Control the tangential axis 14 to be stationary, and the impact axis 12 to give the sample a certain form of movement to achieve the impact test mode;

[0061] 3) Control both axes to run in a certain form to achieve impact / tangential coupling test modes;

[0062] The gas supply device 4 supplies gas to the liquid storage kettle 8 to realize the function of pressing the liquid therein into the test crucible 15. The host computer 10 realizes the setting of the test loading parameters and the liquid temperature through the dedicated control software and stores and processes the test data, and cooperates with the electronic control system 9 to realize the PID closed-loop control of the test loading, ambient temperature and pressure. The pressure sensors and displacement gratings in the impact loading mechanism 2 and the tangential motion mechanism 5 collect the data such as the loading force and the friction force between the samples in real time during the test and transmit them to the host computer 10 for recording and processing, and successively obtains the friction interface response data such as the friction coefficient, wear amount and dissipated energy of the matching pair during the test.

[0063] The signal generator converts the test parameters into control instructions. The control instruction signal and the feedback signal collected by each sensor output an error signal in the comparator. After PID adjustment, this error signal is sent to the voice coil motors of the impact loading module and the tangential motion module at the same time, controlling the two motors to push the shafts connected to them to move in the direction required by the instruction to reduce the error and move towards the control instruction target, thus realizing closed-loop control of the test process. During the entire control process, the regulator continuously adjusts the output of the two drivers to minimize the error between their corresponding feedback signals and the set signals.

[0064] In this embodiment, an air supply device 4 is required to adjust the oxygen content in the test kettle 6. Therefore, a preferred implementation is that four lateral flanges 20 are evenly distributed on the inner wall of the test kettle 6, and a bellows 21 is provided on the lateral flange 20. The impact shaft 12 and the tangential shaft 14 pass through the lateral flange 20 and the bellows 21 respectively. The impact shaft 12 and the tangential shaft 14 are provided with connecting flanges connected to the end faces of the bellows 21. In this way, the inner cavity of the test kettle 6 is sealed by connecting the connecting flange with the end faces of the bellows 21. When the two shafts move in the test kettle 6, they can move by simply pulling the bellows 21 to extend and retract.

[0065] In order to further improve the sealing effect, a sealing ring may be provided between the connecting flange and the bellows 21 .

[0066] In this embodiment, a temperature measuring thermocouple and a ceramic heating blanket 22 for heating the test crucible are provided at the bottom of the test kettle; an insulating kettle 35 for insulating and heat-preserving the liquid storage kettle 8 is provided on the optical platform 7, and a heating blanket for heating the liquid storage kettle 8 is provided inside the insulating kettle 25.

[0067] In this embodiment, a radiator 23 is provided on the side of the test kettle 6 .

[0068] In this embodiment, in order to facilitate loading of samples and replenishment of liquid, a test kettle cover lifting mechanism 1 and a liquid storage kettle cover lifting mechanism 3 are provided on the optical platform 7, and the test kettle cover lifting mechanism 1 and the liquid storage kettle cover lifting mechanism 3 are respectively connected to the test kettle cover and the liquid storage kettle cover; in this way, the test kettle cover and the liquid storage kettle cover are automatically driven to move up and down by the test kettle cover lifting mechanism 1 and the liquid storage kettle cover lifting mechanism 3.

[0069] Among them, the three optical axes in the experimental kettle cover lifting mechanism 1 are symmetrically distributed, the third optical axis (a thicker optical axis) is located in the front, and the other two optical axes, the first and second optical axes, are located on the rear sides. There is a telescopic rod in the middle of the three optical axes. Above the optical platform 7, a cross roller bearing is installed on the annular lifting mechanism base, and above it is the first mounting plate of the lifting mechanism. The electric cylinder base where the driving electric cylinder connected to the telescopic rod is located is installed under the first mounting plate. Three columns are provided between the first mounting plate and the second mounting plate. The three optical axes are all installed on an optical axis connecting seat at the bottom. The three optical axes pass through the first mounting plate and the second mounting plate in turn, and support the crossbeam together with the telescopic rod at the top. The optical axis passes through the mounting plate or supports the crossbeam with a linear bearing solution, and the telescopic rod and the crossbeam adopt an articulated joint method; one end of the crossbeam is connected to the kettle cover.

[0070] In this embodiment, a kettle cover height adaptive adjustment device is provided between the test kettle cover lifting mechanism 1 and the test kettle cover, and between the liquid storage kettle cover lifting mechanism 3 and the liquid storage kettle cover;

[0071] The kettle cover height adaptive adjustment device includes a lifting flange and a connecting plate. The bottom of the connecting plate is fixed on the kettle cover, and a connecting rod is provided on the upper end. A linear bearing is provided on the lifting flange, and a fixing rod connected to the crossbeam is provided. The connecting rod is installed in the linear bearing, and a bolt is provided on one end of the connecting rod extending to the linear bearing.

[0072] The buffer device uses a equi-height stud, which has a screw head and a part of the screw rod is a smooth rod, and the front end of the smooth rod is a threaded rod of a certain length. Four equi-height studs pass through the lifting flange equipped with a linear bearing, and their threaded sections are installed on the bottom mounting plate.

[0073] The function of the height adaptive adjustment device here is that when the lifting mechanism gradually lowers the kettle cover to contact with the test kettle, no other pressure will be generated between the kettle cover and the test kettle due to the lifting displacement of the lifting mechanism. The force between the two is completely provided by the bolts except for gravity.

[0074] In this embodiment, an impact buffer device and a tangential buffer device are respectively provided between the impact axis 12 and the impact-loaded voice coil motor module 11 , and between the tangential axis 14 and the tangential motion voice coil motor module 13 .

[0075] The impact buffer device includes a buffer load-bearing block and an adapter plate 24. The buffer load-bearing block is provided with a buffer linear bearing 25 and a cross force transmission shaft connected to the impact shaft 12. The pressure sensor is installed between the cross force transmission shaft and the buffer load-bearing block. The adapter plate is connected to the output shaft of the impact-loaded voice coil motor module 11. The adapter plate is provided with a plug screw 26 installed in the buffer linear bearing 25. The plug screw 26 is sleeved with a spring located between the buffer load-bearing block and the adapter plate 24.

[0076] The tangential buffer device includes a U-shaped plate and a load-bearing block. The U-shaped plate is connected to the tangential motion voice coil motor module 13, and the load-bearing block is connected to the tangential shaft 14. Two pressure sensors are installed at the upper and lower positions between the U-shaped plate and the load-bearing block.

[0077] In this embodiment, the impact shaft support assembly includes a receiving block 29, two linear sliders 30 and a support seat 31. The two linear sliders 30 are slidably mounted on the upper end surface of the support seat 31, and the receiving block 29 is fixed on the two linear sliders 30. The receiving block 29 is provided with four through holes 32 inside, a V-shaped slide groove 33 on the upper end surface, and heat dissipation blocks 34 are installed on both sides and the top. The structure of the tangential shaft support assembly is the same as that of the impact shaft support assembly.

[0078] A high temperature liquid environment impact-tangential multi-mode fretting wear test method, characterized in that it comprises the following steps:

[0079] Step 1, install the sample: remove the test kettle cover, and then install the upper sample 27 and the lower sample 28 in the upper sample fixture 16 and the lower sample fixture 17 respectively, adjust the positions of each shaft and the fixture so that the upper and lower samples are in contact, and ensure that the samples are not affected by bending stress;

[0080] Step 2, setting the environment: After the test kettle lid and the liquid storage kettle lid are tightened, the liquid is heated to the required temperature, the liquid in the liquid storage kettle is pressed into the test crucible through the air inlet pipe, and then the pipeline valve 19 is closed, and then the oxygen content in the test kettle is adjusted according to the requirements through the air supply device;

[0081] Step 3, setting test parameters: setting impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer 10;

[0082] Step 4, test loading: the impact loading voice coil motor module 11 and the tangential motion voice coil motor module 13 respectively drive the corresponding impact shaft 12 and the tangential shaft 14, the impact shaft 12 realizes the impact action of the upper and lower samples, and the tangential shaft 14 realizes the tangential relative movement of the upper and lower samples;

[0083] Step 5, test force collection and feedback: the grating displacement sensor and pressure sensor on the impact axis 12 measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis 14 measure the tangential friction force and displacement of the sample. The loading force feedback signals such as loading force, displacement and friction force are transmitted to the host computer to realize test data storage and processing;

[0084] Step 6, loading control: The loading force and displacement feedback signals are compared with the given signals to obtain a primary error signal, which is adjusted by the PID regulator and output, and the driver drives the tangential axis and / or impact axis to achieve closed-loop control of the loading force to improve the test accuracy;

[0085] Step 7, test termination: the host computer 10 determines whether the sample has reached the termination condition set by the test by monitoring the signals of each sensor, and the test is terminated;

[0086] Step 8, taking out the sample: After the test is stopped, the host computer 10 sends a signal, the gas supply device 4 stops supplying gas, the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the connecting vessel, and the pipeline valve 19 between the test kettle and the liquid storage kettle is closed, and the sample is taken out after the temperature returns to room temperature.

[0087] The above description is not intended to limit the present invention in any form. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, 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 are within the scope of the technical solution of the present invention.

Claims

1. A high temperature liquid environment impact-tangential multi-mode fretting wear test device, characterized in that: It includes an optical platform, a gas supply device, and an impact loading mechanism, a tangential motion mechanism, a test kettle, a test crucible, and a liquid storage kettle installed on the optical platform; The impact loading mechanism comprises an impact loading voice coil motor module, an impact shaft, and two impact shaft support assemblies. The two ends of the impact shaft respectively pass through the test kettle and are slidably mounted on the two impact shaft support assemblies, and one end of the impact shaft is connected to the output end of the impact loading voice coil motor module. The tangential motion mechanism comprises a tangential motion voice coil motor module, a tangential shaft, and two tangential shaft support assemblies; two ends of the tangential shaft respectively pass through the test kettle and are slidably mounted on the two tangential shaft support assemblies, and one end of the tangential shaft is connected to the output end of the tangential motion voice coil motor module; The test crucible is installed in the test kettle, the impact shaft has an impact concave section located in the test kettle, the tangential shaft has a tangential concave section located in the test kettle and above the impact concave section, and the impact concave section and the tangential concave section are respectively provided with an upper sample fixture and a lower sample fixture; The liquid storage kettle is connected with the bottom of the test crucible through a pipeline. The height design between the liquid storage kettle and the test crucible is based on the principle of communicating vessels. Under normal pressure, the liquid inside the test crucible completely flows back to the liquid storage kettle. The test kettle and the liquid storage kettle are respectively provided with a test kettle cover and a liquid storage kettle cover. The test kettle cover and the liquid storage kettle cover are both provided with an air outlet pipe and an air inlet pipe connected to the air supply device.

2. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: Four lateral flanges are evenly distributed on the inner wall of the test kettle, and a bellows is arranged on the lateral flange. The impact shaft and the tangential shaft pass through the lateral flange and the bellows respectively, and the impact shaft and the tangential shaft are provided with connecting flanges connected to the end faces of the bellows.

3. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: A ceramic heating blanket for heating the test crucible is provided at the bottom of the test kettle; an insulating kettle for insulating and heat-preserving the liquid storage kettle is provided on the optical platform, and a heating blanket for heating the liquid storage kettle is provided inside the insulating kettle.

4. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: The optical platform is provided with a test kettle cover lifting mechanism and a liquid storage kettle cover lifting mechanism, and the test kettle cover lifting mechanism and the liquid storage kettle cover lifting mechanism are connected to the test kettle cover and the liquid storage kettle cover respectively.

5. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 4, characterized in that: A kettle cover height self-adaptive adjustment device is provided between the test kettle cover lifting mechanism and the test kettle cover, and between the liquid storage kettle cover lifting mechanism and the liquid storage kettle cover.

6. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: An impact buffer device and a tangential buffer device are respectively arranged between the impact shaft and the impact-loaded voice coil motor module, and between the tangential shaft and the tangential motion voice coil motor module.

7. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: Two impact shaft support assemblies and two tangential shaft supports are arranged oppositely on the outer wall of the test kettle.

8. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: The impact shaft support assembly includes a receiving block, two linear sliders and a support seat. The two linear sliders are slidably installed on the upper end surface of the support seat, and the receiving block is fixed on the two linear sliders. Four through holes are provided inside the receiving block, and a V-shaped groove is provided on the upper end surface, and heat dissipation blocks are installed on both sides and the top.

9. The high temperature liquid environment impact-tangential multi-mode fretting wear test device according to claim 1, characterized in that: The impact loading mechanism and the tangential motion mechanism are both provided with pressure sensors and grating displacement sensors; the test kettle cover and the liquid storage kettle cover are both provided with pressure gauges, and the test kettle is also provided with an oxygen sensor. The micro-motion wear test device also includes a host computer and an electronic control system electrically connected to the host computer, and the electronic control system is electrically connected to the pressure sensor, the grating displacement sensor, and the oxygen sensor, respectively.

10. A high temperature liquid environment impact-tangential multi-mode fretting wear test method, characterized in that: The following steps are involved: Step 1. Install the sample: remove the test kettle cover, and then install the sample in the upper sample fixture and the lower sample fixture respectively, adjust the position of each shaft and the fixture so that the upper and lower samples are in contact, and ensure that the sample is not affected by bending stress; Step 2, setting the environment: After the test kettle lid and the liquid storage kettle lid are tightened, the liquid is heated to the required temperature, the liquid in the liquid storage kettle is pressed into the test crucible through the air inlet pipe, and then the pipeline valve is closed, and then the oxygen content in the test kettle is adjusted according to the requirements through the air supply device; Step 3, set the test parameters: set the impact axis loading parameters, tangential axis motion parameters and test termination conditions in the host computer; Step 4, test loading: the impact loading voice coil motor module and the tangential motion voice coil motor module drive the corresponding impact axis and tangential axis respectively, the impact axis realizes the impact action of the upper and lower samples, and the tangential axis realizes the tangential relative motion of the upper and lower samples; Step 5, test force collection and feedback: the grating displacement sensor and pressure sensor on the impact axis measure the normal impact load and displacement of the sample, and the grating displacement sensor and pressure sensor on the tangential axis measure the tangential friction force and displacement of the sample. The loading force, displacement, friction force and other loading force feedback signals are transmitted to the host computer to realize test data storage and processing; Step 6, loading control: The loading force and displacement feedback signals are compared with the given signals to obtain a primary error signal, which is adjusted by the PID regulator and output, and the driver drives the tangential axis and / or impact axis to achieve closed-loop control of the loading force to improve the test accuracy; Step 7, test termination: the host computer determines whether the sample has reached the termination condition set by the test by monitoring the signals of each sensor, and the test stops; Step 8, take out the sample: After the test stops, the host computer sends a signal, the gas supply device stops supplying gas, the liquid lead and bismuth in the test crucible in the test kettle will flow back to the liquid storage kettle due to the connecting vessel, and the valve between the test kettle and the liquid storage kettle is closed. Wait until the temperature returns to room temperature before taking out the sample.

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