Full-mode fretting wear test system and composite fretting wear test method

Abstract

The invention relates to the technical field of fretting wear experiments, and discloses a full-mode fretting wear test system and a composite fretting wear test method.The full-mode fretting wear test system comprises a rack and linear guide rails, the linear guide rails are installed on the two sides of the interior of the rack, and a lifting cross beam is slidably connected between the linear guide rails on the two sides; the top of the lifting cross beam is connected with the rack through a servo electric cylinder, an upper test module is arranged at the bottom of the lifting cross beam, a lower test module is arranged on the bottom face in the rack and located under the upper test module, and samples are installed on the upper test module and the lower test module. And the servo electric cylinder drives the lifting cross beam to move up and down so as to apply normal force between the upper sample and the lower sample. An upper test module and a lower test module are multi-mode micro-motion modules, the multi-mode micro-motion modules are divided into a radial loading module, a tangential micro-motion module, a twisting micro-motion module, a rotating micro-motion module and a high-speed pin disc module, and proper modules are selected for installation according to different test requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of fretting wear experiments, and more particularly to a full-mode fretting wear test system and a composite fretting wear test method. Background Art

[0002] As a special friction motion different from sliding and rolling, the research depth and systematicity of micromotion is far less than that of the other two modes. On the one hand, its hidden nature has led to its dangers and hazards that have not been widely recognized in the industry. On the other hand, there is a lack of effective research methods.

[0003] Micromotion damage is widely present in all fields of modern industry and is called the cancer of modern industry. Due to the lack of experimental means, current research at home and abroad mainly focuses on the tangential micromotion mode, and the research is not in-depth enough.

[0004] Therefore, how to develop a testing system and experimental method that integrates all basic micro-motion operating modes (tangential, radial, torsional and rotational) and composite modes (impact micro-motion, radial + tangential, radial + torsional, torsional + rotational), as well as contact interface mechanical behavior detection technology is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a full-mode fretting wear test system and a composite fretting wear test method, which breaks through the technical problems of lack of experimental research means and substandard key parameters in the field of fretting wear. It adopts modular design principles and standardized mechanical and electrical interfaces to achieve comprehensive coverage of all modes in the field of fretting and sliding tribology, and provides advanced basic research scientific instruments and experimental methods for the field of fretting tribology research.

[0006] To achieve the above-mentioned purpose, the present invention provides a full-mode micro-motion wear testing system, including a frame and a linear guide rail, wherein the linear guide rail is installed on both sides of the frame, and a lifting beam is slidably connected between the linear guide rails on both sides, and the top of the lifting beam is connected to the frame through a servo electric cylinder, and an upper test module is provided at the bottom of the lifting beam, and an upper sample fixture is installed on the upper test module, and a lower test module is provided on the bottom surface of the frame, and the lower test module is located directly below the upper test module, and a lower sample fixture is installed on the lower test module, and samples are installed on both the upper test module and the lower test module, and the lifting beam is driven up and down by the servo electric cylinder to apply a normal force between the upper and lower samples; The upper test module and the lower test module are multi-mode micro-motion modules, which include radial loading module, tangential micro-motion module, torsional micro-motion module, rotational micro-motion module and high-speed pin-disk module. Appropriate modules are selected for installation according to different test requirements.

[0007] Preferably, the radial loading module includes a base and a pressure sensor arranged on the base, the end of the pressure sensor away from the base is installed with a radial clamp through a bracket, linear sliders are installed between the left plate of the bracket and the left plate of the base, and between the right plate of the bracket and the right plate of the base, and the pressure sensor feeds back the force signal collected in real time to the host computer to perform real-time force closed-loop control and compensation.

[0008] Preferably, the tangential micro-motion module includes a base and a cylindrical voice coil motor and a linear slide rail arranged on the base, the linear slide rail is connected to a tangential fixture via a slide rail, a grating displacement sensor is provided on the end surface of the slide rail facing the linear slide rail, the left end of the slide rail is connected to the cylindrical voice coil motor, a friction force sensor is provided between the slide rail and the cylindrical voice coil motor, and the friction force sensor is used to measure the shear stress between the two specimens in real time during the test phase.

[0009] Preferably, the torsion micro-motion module includes a torque DD motor and a friction torque sensor connected to the torque DD motor, a torsion fixture is installed on the torque DD motor, and the friction torque sensor is used to measure the friction torque between two samples in real time during the test phase.

[0010] Preferably, the rotary micro-motion module comprises a rotary DD motor and a rotary shaft, one end of the rotary shaft is mounted on the rotary DD motor, and a rotary fixture is mounted on the side of the other end of the rotary shaft.

[0011] Preferably, the high-speed pin-disk module includes a high-speed servo motor and a commutator, the output shaft of the high-speed servo motor is connected to the commutator, and a pin-disk fixture is installed on the commutator.

[0012] Preferably, the upper test module is mounted on the lifting beam via a quick-release locking pin.

[0013] The composite fretting wear test method provided by the present invention comprises the following steps: Step 1. Install the test module: select the appropriate upper test module and lower test module, connect the standardized electrical interface to connect the module power and communication to the host computer, and fix the normal loading module to the lifting beam through the quick release locking pin; Step 2: Install the samples: Install the samples on the upper test module and the lower test module respectively, and adjust the position of the lifting beam to keep the upper and lower samples at a certain distance; Step 3: Set the test parameters: set the normal load, displacement amplitude, angular displacement amplitude and test termination conditions in the host computer; Step 4: Test loading: The servo electric cylinder drives the lifting beam and the upper test module to move, so that the upper and lower specimens are in contact and reach the preset load, and the micro-motion mode realizes the set action; Step 5: Test force collection and feedback: The pressure sensor in the multi-mode micro-motion module measures the normal load on the sample, the friction sensor measures the tangential friction force of the sample, and the grating displacement sensor measures the displacement and angular displacement of the sample. The feedback signals of the loading force, displacement and friction force are transmitted to the host computer to realize the storage and processing of test data; Step 6, closed-loop control: Compare the loading force and displacement feedback signals with the set signals, and improve the control accuracy of force and displacement through PID closed-loop regulation control; Step 7. Test termination: After the preset conditions are met, the host computer outputs a stop signal; each module stops moving, the lifting beam is raised to the appropriate position, and the upper and lower samples are taken out.

[0014] It can be seen from the above technical solutions that, compared with the prior art, the full-mode fretting wear test system and the composite fretting wear test method disclosed in the present invention have the following beneficial effects: 1. The present invention can replace different modules through standard electrical interfaces to achieve all forms of micro-motion wear and sliding wear; 2. The present invention realizes the real-time detection of the mechanical behavior of the sample contact interface under all micro-motion operation modes, thereby revealing the internal mechanism of the mechanical behavior response of the friction interface under different micro-motion modes; 3. The present invention realizes the detection of energy dissipation of friction interface in all micro-motion operation modes, thereby revealing the energy loss and its evolution law in the material damage process and deepening the understanding of the material damage mechanism; 4. The test device of the present invention has the technical characteristics of wide range and multiple measurement range, modular multi-function, multi-environment dynamic simulation and high-precision real-time detection. It is a scientific instrument with advanced technology and complete functions.

[0015] In summary, the technical indicators of the present invention exceed the current highest international level, and have achieved a complete set of technology accumulation with completely independent intellectual property rights, laying the foundation for the industrialization of instruments, and establishing a complete set of micro-motion tribology test methods. At the same time, facing the frontiers of disciplines and engineering, starting from the major needs of safe service of key components of major national projects such as nuclear power, aircraft engines, and gas turbines, based on the micro-motion wear test device and test method of the present invention, it is possible to establish a test device and evaluation method for micro-motion damage under extreme service conditions, and guide the service safety assessment of key components of major projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 It is the overall structure diagram of the full-mode fretting wear testing system of the present invention; Figure 2 It is a structural schematic diagram of the radial loading module of the present invention; Figure 3 It is a structural schematic diagram of the tangential micro-motion module of the present invention; Figure 4 It is a structural schematic diagram of the twisting micro-motion module of the present invention; Figure 5 It is a structural schematic diagram of the rotary micro-motion module of the present invention; Figure 6 It is a structural schematic diagram of the high-speed pin-disk module of the present invention; Figure 7 It is a schematic structural diagram of the radial micro-motion wear unit of the present invention; Figure 8 It is a schematic structural diagram of the tangential micro-motion wear unit of the present invention; Fig. 9 It is a schematic structural diagram of the torsional micro-motion wear unit of the present invention; Fig.10 It is a structural schematic diagram of the rotary micro-motion wear unit of the present invention; Fig.11 It is a schematic structural diagram of the torsional fretting wear unit of the present invention; Fig.12 It is a structural schematic diagram of the impact fretting wear mode of the present invention; Fig.13 It is a schematic structural diagram of punching-cutting composite fretting wear in the impact fretting wear mode of the present invention; Fig.14 It is a structural schematic diagram of the high-speed pin-disk sliding wear mode of the present invention.

[0018] Explanation of the reference numerals: 1-frame; 2-linear guide; 3-lower test module; 4-lower sample fixture; 5-lifting beam; 6-servo electric cylinder; 7-upper test module; 8-upper sample fixture; 9-radial fixture; 10-pressure sensor; 11-linear slider; 12-cylindrical voice coil motor; 13-friction sensor; 14-tangential fixture; 15-grating displacement sensor; 16-linear slide; 17-torsion fixture; 18-torsion DD motor; 19-rotation fixture; 20-rotation shaft; 21-rotation DD motor; 22-high-speed servo motor; 23-commutator; 24-pin-disk fixture. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of an exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0020] Please see attached Figure 1-14 , which is a full-mode micro-motion wear testing system disclosed in the present invention.

[0021] The full-mode fretting wear test system provided by the present invention comprises a frame 1, a linear guide rail 2, a lower test module 3, a lower sample fixture 4, a lifting beam 5, a servo electric cylinder 6, an upper test module 7, and an upper sample fixture 8.

[0022] like Figure 1 As shown, the test device uses a frame 1 as the main bearing structure, linear guides 2 are installed on both sides of the frame 1, and a lifting beam 5 is installed on the frame 1 through the linear guides 2. The upper end of the lifting beam 5 is connected to the frame 1 through a servo electric cylinder 6. The upper test module 7 is installed on the lifting beam 5 through a quick release lock pin, the upper sample fixture 8 is installed on the upper test module 7, the lower test module 3 is installed at the lower end of the upper test module 7, and the lower sample fixture 4 is installed on the lower test module 3. Samples are installed on both the upper test module 7 and the lower test module 3.

[0023] During the test phase, the lifting beam 5 is driven up and down by the servo electric cylinder 6 to apply a normal force to the upper and lower specimens; the upper test module 7 and the lower test module 3 are multi-mode micro-motion modules, which include radial loading modules, tangential micro-motion modules, torsional micro-motion modules, rotational micro-motion modules, reciprocating sliding modules and high-speed pin-disk modules. Appropriate modules are selected for installation according to different test requirements.

[0024] like Figure 2 As shown, the radial loading module includes a base and a pressure sensor 10 arranged on the base, and the end of the pressure sensor 10 away from the base is installed with a radial clamp 9 through a bracket, and a linear slider 11 is installed between the left plate of the bracket and the left plate of the base, and between the right plate of the bracket and the right plate of the base. The pressure sensor 10 feeds back the force signal collected in real time to the host computer to perform real-time force closed-loop control and compensation.

[0025] like Figure 3As shown, the tangential micro-motion module includes a base and a cylindrical voice coil motor 12 and a linear slide 16 arranged on the base, the linear slide 16 is connected to a tangential fixture 14 through a slide, a grating displacement sensor 15 is provided on the end surface of the slide facing the linear slide 16, the left end of the slide is connected to the cylindrical voice coil motor 12, a friction sensor 13 is provided between the slide and the cylindrical voice coil motor 12, and the friction sensor 13 is used to measure the shear stress between the two samples in real time during the test phase.

[0026] like Figure 4 As shown, the torsion micro-motion module includes a torque DD motor 18 and a friction torque sensor connected to the torque DD motor 18. A torsion fixture 17 is installed on the torque DD motor 18. The friction torque sensor is used to measure the friction torque between two samples in real time during the test phase.

[0027] like Figure 5 As shown, the rotary micro-motion module includes a rotary DD motor 21 and a rotary shaft 20 , one end of the rotary shaft 20 is mounted on the rotary DD motor 21 , and a rotary fixture 19 is mounted on the side of the other end of the rotary shaft 20 .

[0028] like Figure 6 As shown, the high-speed pin-disk module includes a high-speed servo motor 22 and a commutator 23 . The output shaft of the high-speed servo motor 22 is connected to the commutator 23 , and a pin-disk fixture 24 is installed on the commutator 23 .

[0029] The composite fretting wear test method provided by the present invention comprises the following steps: Step 1, install the test module: select the appropriate upper test module 7 and lower test module 3, connect the standardized electrical interface to connect the module power and communication to the host computer, and fix the normal loading module to the lifting beam 5 through the quick release locking pin; Step 2, installing the sample: install the sample on the upper test module 7 and the lower test module 3 respectively, and adjust the position of the lifting beam 5 so that the upper and lower samples are at a certain distance; Step 3: Set the test parameters: set the normal load, displacement amplitude, angular displacement amplitude and test termination conditions in the host computer; Step 4, test loading: the servo electric cylinder 6 drives the lifting beam 5 and the upper test module 7 to move, so that the upper and lower specimens are in contact and reach the preset load, and the micro-motion mode realizes the set action; Step 5, test force collection and feedback: the pressure sensor 10 in the multi-mode micro-motion module measures the normal load on the sample, the friction sensor 13 measures the tangential friction force of the sample, and the grating displacement sensor 15 measures the displacement and angular displacement of the sample, and transmits the feedback signals of the loading force, displacement and friction force to the host computer to realize the storage and processing of the test data; Step 6, closed-loop control: Compare the loading force and displacement feedback signals with the set signals, and improve the control accuracy of force and displacement through PID closed-loop regulation control; Step 7, test termination: After the preset conditions are met, the host computer outputs a stop signal; each module stops moving, the lifting beam 5 is lifted to a suitable position, and the upper and lower samples are taken out.

[0030] The mode combination schemes of the full-mode fretting wear test system provided by the present invention are: 1. Radial fretting wear unit The upper test module 7 and the lower test module 3 respectively select a radial loading module and a torsional micro-motion module.

[0031] like Figure 7 As shown, the radial fretting wear test requires a non-zero alternating load in the normal direction. Under the condition that the horizontal motion base is fixed, the upper servo electric cylinder 6 is driven to output and control the alternating load control after applying a non-zero pressure, thus realizing radial fretting wear.

[0032] 2. Tangential fretting wear unit The upper test module 7 and the lower test module 3 respectively select a radial loading module and a tangential micro-motion module.

[0033] like Figure 8 As shown, in the upper part of the unit, a servo electric cylinder 6 provides a constant normal load Fn, which is measured by a load sensor connected thereto; the upper sample and its fixture are connected below the load sensor. In the lower part of the unit, the lower sample and its fixture are mounted on a horizontally movable base, the movement of which is controlled by a VCA voice coil motor; the amplitude of the tangential relative motion is measured and feedback-controlled by a horizontal grating displacement sensor 15.

[0034] 3.Twist and fretting wear unit The upper test module 7 and the lower test module 3 respectively select a radial loading module and a torsional micro-motion module.

[0035] like Fig. 9 As shown, the upper servo electric cylinder 6 provides a constant normal load applied to the upper sample, the torsional relative motion is provided by the torsional DD motor 18, and the reciprocating relative torsional displacement is detected by the grating displacement sensor 15 and feedback control is performed. The friction torque of the contact interface is measured by the torque sensor connected to the torsional DD motor 18. A linear motor drive module can be configured below the torsional micro-motion drive module to move the torsional micro-motion device in the horizontal direction, which is conducive to changing different contact positions.

[0036] 4. Rotational fretting wear unit and torsional fretting wear unit The upper test module 7 and the lower test module 3 respectively select a radial loading module and a rotation micro-motion module.

[0037] As Figure 10-11 shown, the essential difference between rotational fretting and torsional fretting lies in that the direction of the rotary motion differs by 90°. For torsional fretting, if the rotation angle = 0°, then the rotational fretting = 90°; and between the two, that is, 0° < α < 90°, the fretting operation mode is torsional composite fretting.

[0038] 5. Impact fretting wear mode The lower test module 3 selects the torsional fretting module and the tangential fretting module respectively. As Figure 12-13 shown, impact fretting wear is a complex wear form that is a combination of tangential fretting wear and impact wear. For the impact wear test, a VCA voice coil motor is used as the driving device at the upper part of the system, and the output load is transmitted to the moving mass block of the impact load generating device through the damping punch, so that the moving mass block obtains energy and thus generates an impact.

[0039] 6. High-speed pin-on-disc sliding wear mode The upper test module 7 and the lower test module 3 select the radial loading module and the high-speed pin-on-disc module respectively.

[0040] As Fig.14 shown, the high-speed pin-on-disc sliding wear applies a constant normal load to the upper specimen by the servo electric cylinder 6 at the upper part, and the lower specimen is driven to rotate at high speed by the high-speed servo motor 22 below, so that sliding wear occurs between the two specimens.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A full-mode fretting wear test system, characterized in that: The invention comprises a frame (1) and a linear guide rail (2), wherein the linear guide rail (2) is installed on both sides of the frame (1), a lifting beam (5) is slidably connected between the linear guide rails on both sides, the top of the lifting beam (5) is connected to the frame (1) via a servo electric cylinder (6), an upper test module (7) is provided at the bottom of the lifting beam (5), an upper sample fixture (8) is installed on the upper test module (7), a lower test module (3) is provided on the bottom surface of the frame (1), the lower test module (3) is located directly below the upper test module (7), a lower sample fixture (4) is installed on the lower test module (3), and samples are installed on both the upper test module (7) and the lower test module (3), and the lifting beam (5) is driven to move up and down by the servo electric cylinder (6) to apply a normal force between the upper and lower samples; The upper test module (7) and the lower test module (3) are multi-mode micro-motion modules, which include a radial loading module, a tangential micro-motion module, a torsional micro-motion module, a rotational micro-motion module and a high-speed pin-disk module. Suitable modules are selected for installation according to different test requirements.

2. The full-mode fretting wear testing system according to claim 1, characterized in that: The radial loading module comprises a base and a pressure sensor (10) arranged on the base, wherein the end of the pressure sensor (10) away from the base is equipped with a radial clamp (9) through a bracket, and a linear slider (11) is installed between the left side plate of the bracket and the left side plate of the base, and between the right side plate of the bracket and the right side plate of the base. The pressure sensor (10) feeds back the force signal collected in real time to the host computer to perform real-time force closed-loop control and compensation.

3. The full-mode fretting wear testing system according to claim 1, characterized in that: The tangential micro-motion module comprises a base, a cylindrical voice coil motor (12) and a linear slide rail (16) arranged on the base, the linear slide rail (16) being connected to a tangential fixture (14) via a slide plate, a grating displacement sensor (15) being provided on the end surface of the slide plate facing the linear slide rail (16), the left end of the slide plate being connected to the cylindrical voice coil motor (12), a friction force sensor (13) being provided between the slide plate and the cylindrical voice coil motor (12), and the friction force sensor (13) being used for real-time measurement of the shear stress between two specimens during a test phase.

4. The full-mode fretting wear testing system according to claim 1, characterized in that: The torsion micro-motion module comprises a torque DD motor (18) and a friction torque sensor connected to the torque DD motor (18); a torsion fixture (17) is mounted on the torque DD motor (18); and the friction torque sensor is used to measure the friction torque between two samples in real time during a test phase.

5. The full-mode fretting wear testing system according to claim 1, characterized in that: The rotary micro-motion module comprises a rotary DD motor (21) and a rotary shaft (20); one end of the rotary shaft (20) is mounted on the rotary DD motor (21); and a rotary fixture (19) is mounted on the side of the other end of the rotary shaft (20).

6. The full-mode fretting wear testing system according to claim 1, characterized in that: The high-speed pin-disk module comprises a high-speed servo motor (22) and a commutator (23); an output shaft of the high-speed servo motor (22) is connected to the commutator (23); and a pin-disk fixture (24) is installed on the commutator (23).

7. The full-mode fretting wear testing system according to claim 1, characterized in that: The upper test module (7) is mounted on the lifting beam (5) via a quick-release locking pin.

8. A composite fretting wear test method, applied to the full-mode fretting wear test system as described in any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, install the test module: select the appropriate upper test module (7) and lower test module (3), connect the standardized electrical interface to connect the module power and communication to the host computer, and fix the normal loading module to the lifting beam (5) through the quick release locking pin; Step 2, installing the sample: installing the sample on the upper test module (7) and the lower test module (3) respectively, adjusting the position of the lifting beam (5) so that the upper and lower samples are at a certain distance; Step 3: Set the test parameters: set the normal load, displacement amplitude, angular displacement amplitude and test termination conditions in the host computer; Step 4, test loading: the servo electric cylinder (6) drives the lifting beam (5) and the upper test module (7) to move, so that the upper and lower specimens are in contact and reach the preset load, and the micro-motion mode realizes the set action; Step 5, test force acquisition and feedback: the pressure sensor (10) in the multi-mode micro-motion module measures the normal load on the sample, the friction sensor (13) measures the tangential friction of the sample, and the grating displacement sensor (15) measures the displacement and angular displacement of the sample. The feedback signals of the loading force, displacement and friction force are transmitted to the host computer to realize the storage and processing of the test data; Step 6, closed-loop control: Compare the loading force and displacement feedback signals with the set signals, and improve the control accuracy of force and displacement through PID closed-loop regulation control; Step 7, test termination: After the preset conditions are met, the host computer outputs a stop signal; each module stops moving, the lifting beam (5) is lifted to a suitable position, and the upper and lower samples are taken out.

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