Platform and method for measuring tribological performance of material under ultrasonic / non-ultrasonic action

Abstract

The invention discloses a tribological performance testing platform applied to a material under ultrasonic action or without ultrasonic action, the tribological performance testing platform comprises a testing platform and a driving platform, and the testing platform and the driving platform are connected through a coupling; the test platform is used for bearing a workpiece, applying positive pressure and ultrasonic action to the workpiece and measuring the positive pressure; the driving platform is used for enabling the workpiece to move in different states so as to generate friction force and measure the friction force. The invention provides a measuring platform and a measuring method. The measuring platform and the measuring method can reveal the influence of ultrasound on the tribological performance of a workpiece under the conditions of incapable positive pressure, workpiece movement speed, temperature, humidity, lubrication, roughness, interference fit and the like. More importantly, due to the fact that the structure is simple, enough space is reserved on the periphery of the device to add measuring equipment so as to measure the influence of ultrasound on the tribological performance of the workpiece under more different conditions, and the device has good generalization performance.

Description

Technical Field

[0001] This invention relates to friction and wear devices, specifically to a reciprocating friction and wear platform device under ultrasonic action. This technology, combined with practical applications, can be used to determine the tribological properties of difficult-to-machine materials, composite materials, and other materials under both ultrasonic and non-ultrasonic conditions. Background Technology

[0002] Friction and wear testing is not only a core means of quantifying the tribological properties of materials, but also a bridge connecting basic theory, engineering optimization, and practical applications. Its scientific value lies in revealing the complex response of materials in dynamic contact, while its engineering value is reflected in reducing the failure risk of real systems through controllable simulation.

[0003] Ultrasonic machining is a method that uses ultrasonic vibration to assist traditional machining processes. It is primarily used to improve machining performance, enhance machining quality, and solve machining problems involving difficult-to-machine materials. This technology combines the high-frequency characteristics of ultrasonic vibration with the mechanical effects of traditional machining, and has been widely applied in fields such as aerospace, precision manufacturing, the automotive industry, and electronics manufacturing.

[0004] Investigating the tribological properties of different materials under ultrasonic action is of great significance for revealing the mechanism of ultrasonic action in actual processing. Therefore, a friction and wear platform under ultrasonic action was designed. Summary of the Invention

[0005] This invention provides a platform and method for measuring the tribological properties of materials under ultrasonic or non-ultrasonic conditions, which can solve the problems in the prior art.

[0006] The specific solution adopted in this invention is as follows: A tribological property testing platform for materials under ultrasonic / non-ultrasonic conditions, the tribological property testing platform includes a test platform 1 and a drive platform 2, the test platform 1 and the drive platform 2 being connected by a coupling 26; The test platform 1 is used to support the workpiece 27, apply positive pressure and ultrasonic action to the workpiece 27, and measure the positive pressure. The drive platform 2 is used to make the workpiece move in different states, thereby generating friction and measuring the friction.

[0007] The further optimized solution is as follows: The test platform 1 has a base plate 3 for supporting the entire test platform 1, and a positive pressure force gauge 4 is fixed in the middle of the base plate 3; longitudinal moving guide rails 5 are arranged vertically on both sides of the base plate 3 and on both sides of the positive pressure force gauge 4. Longitudinal moving sliders 6 are provided on the longitudinal moving guide rails 5 on both sides. The two ends of the ultrasonic transducer fixing fixture 7 are respectively connected to the longitudinal moving sliders 6. A transducer 8 is provided in the middle of the ultrasonic transducer fixing fixture 7. A transverse moving guide rail 12 is provided on the positive pressure force measuring instrument 4 via a guide rail fixing fixture 11. A transverse moving slider 13 is movably provided on the transverse moving guide rail 12. A workpiece fixing fixture 14 for fixing the workpiece 27 is fixed on the transverse moving slider 13. The workpiece 27 is fixed on the upper surface of the workpiece fixing fixture 14.

[0008] The further optimized solution is as follows: A counterweight fixing shaft 10, coaxial with the transducer 8, is provided on the bottom of the transducer 8, and the counterweight 9 passes through the counterweight fixing shaft 10.

[0009] The further optimized solution is as follows: The drive platform 2 has a housing 16, on which a drive motor 17 is fixed. The output shaft of the drive motor 17 is connected to one end of a transmission screw 18. The transmission screw 18 is located inside the housing 16, and the other end of the transmission screw 18 is rotatably supported on a screw support seat 19. The drive motor 17 drives the transmission screw 18 to rotate in the forward / reverse direction inside the housing 16. A lead screw nut 20 is provided on the lead screw 18, and the lead screw nut 20 is fixedly connected to the lead screw nut seat 21. The lead screw nut seat 21 has a through hole in the middle and is sleeved on the lead screw 18. The two sides of the lead screw nut seat 21 abut against the two inner sides of the outer casing 16. A transmission fixture 22 is also provided above the lead screw nut seat 21. One end of the friction sensor 24 is connected to the transmission fixture 22 through an internal and external thread conversion joint 23, and the other end is connected to the drive table transmission shaft 25.

[0010] The further optimized solution is as follows: The drive shaft 25 of the drive stage is connected to the drive shaft 15 of the test stage via a coupling 26.

[0011] The further optimized solution is as follows: The lead screw nut seat 21 is a block structure. In order to prevent the lead screw nut seat 21 from interfering with the transmission lead screw 18 when it is driven to move, a lead screw nut 20 is also provided on the other side of the lead screw nut seat 21. The lead screw nut 20 is also provided on the transmission lead screw 18.

[0012] The further optimized solution is as follows: The pressure value acting on the workpiece 27 is obtained by calculating the readings of the normal force measuring instrument 4. The friction force value on the workpiece 27 is obtained by calculating the readings of the friction sensor 24. The friction coefficient can be obtained by dividing the friction force value by the pressure value.

[0013] This invention also discloses a method for determining the tribological properties of materials under ultrasonic irradiation based on the aforementioned testing platform, which has the aforementioned tribological property testing platform applicable to materials under ultrasonic irradiation / without ultrasonic irradiation; the steps of this method are as follows. The workpiece 27 is fixed on the workpiece fixing fixture 14; Select the weight of the counterweight 9 and fix the counterweight 9 on the counterweight block fixing shaft 10; Start the transducer 8 and the drive motor 17; Read the data from the friction sensor 24 and the normal force measuring instrument 4 to obtain the current operating status of the transducer 8; Change the operating state of the transducer 8 and / or the weight of the counterweight 9, and read the data from the friction sensor 24 and the normal force measuring instrument 4; Calculate the effect of different ultrasonic effects provided by the transducer 8 on the friction coefficient.

[0014] The further optimized solution is as follows: The transducer 8 is turned off, and the additional transducer action is applied in the same direction, opposite direction, or both directions of the workpiece 8's movement direction simultaneously; the influence of different ultrasonic actions provided by the transducer 8 on the friction coefficient is calculated.

[0015] The further optimized solution is as follows: By changing the state of workpiece 27, the effects of different ultrasonic actions provided by the transducer 8 on the coefficient of friction are calculated.

[0016] This invention provides a measurement platform and method capable of revealing the effects of ultrasound on the tribological properties of workpieces under various conditions, including normal pressure, workpiece movement speed, temperature, humidity, lubrication, roughness, and interference fit. More importantly, due to its simple structure, this invention allows for the addition of measuring equipment to measure the effects of ultrasound on workpiece tribological properties under diverse conditions. For example, it can measure the effects of applying ultrasound in the same direction, different directions, or oblique directions on the tribological properties of the workpiece, and can also measure the effect of the combination of multiple transducers on the tribological properties of the workpiece. The drive motor of this invention uses a high-precision servo motor, enabling more precise workpiece actuation. This invention can provide measurements of workpiece tribological properties under numerous transducer states or normal pressure conditions, requiring only simple data processing and possessing good scalability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the friction and wear platform of the present invention.

[0018] Figure 2This is a top view of the friction and wear platform of the present invention.

[0019] Figure 3 This is a schematic diagram of the drive platform structure of the present invention (excluding the outer casing).

[0020] In the figure: 1. Test platform; 2. Drive platform; 3. Base plate; 4. Normal force measuring instrument; 5. Longitudinal moving guide rail; 6. Longitudinal moving slider; 7. Ultrasonic transducer fixing fixture; 8. Transducer; 9. Counterweight; 10. Counterweight fixing shaft; 11. Guide rail fixing fixture; 12. Lateral moving guide rail; 13. Lateral moving slider; 14. Workpiece fixing fixture; 15. Test table drive shaft. 16. Housing 17. Drive motor 18. Transmission screw 19. Screw support 19. Screw nut 20. Screw nut seat 21. Transmission tooling 22. Internal and external thread conversion joint 23. Friction sensor 24. Drive table transmission shaft 25. Coupling 26, workpiece 27. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] This invention discloses a tribological property measurement platform for materials under ultrasonic or non-ultrasonic conditions. The platform measures data when the workpiece is subjected to reciprocating friction, thereby obtaining the tribological property data of the workpiece under friction.

[0023] Reference Appendix Figure 1 , 2 The tribological performance testing platform of the present invention comprises two main parts: a testing platform 1 and a driving platform 2. The testing platform 1 is used to place the workpiece 27 to be tested and to apply ultrasonic force to the workpiece 27. The driving platform 2 is used to apply force to the workpiece 27 through a connecting member, thereby generating frictional force.

[0024] Reference Appendix Figure 1 , 2 The test platform 1 includes a base plate 3 for support. A positive pressure force gauge 4 is fixed in the middle of the base plate 3. Vertical moving guide rails 5 are arranged on both sides of the base plate 3 and on both sides of the positive pressure force gauge 4. As shown in the figure, in this invention, the vertical moving guide rails 5 are fixed by vertical straight plates, straight columns, or structures with the same function extending upward on both sides of the base plate 3.

[0025] Longitudinal sliding blocks 6 are provided on the longitudinal moving guide rails 5 on both sides. The purpose of providing two longitudinal sliding blocks 6 is to fix both ends of the ultrasonic transducer fixing fixture 7. In order to keep the ultrasonic transducer fixing fixture 7 in a horizontal state, the longitudinal sliding blocks 6 on both sides need to be adjusted synchronously. Adjusting the longitudinal sliding blocks 6 drives the ultrasonic transducer fixing fixture 7 to move up and down, thereby driving the transducer 8 fixed in the middle of the ultrasonic transducer fixing fixture 7 to move up and down.

[0026] A counterweight fixing shaft 10, coaxial with the transducer 8, is provided on the bottom of the transducer 8, and the counterweight 9 passes through the counterweight fixing shaft 10. In order to ensure that the counterweight 9 can apply a balanced pressure to the transducer 8, it is preferable that the counterweight 9 is cylindrical, and the perforation is provided at the central axis of the counterweight 9.

[0027] To ensure that the counterweight 9 and the counterweight fixing shaft 10 do not affect the transducer, but only exert gravity on the transducer 8, an isolation member is provided between the counterweight 9 and the counterweight fixing shaft 10 and the transducer 8. The isolation member is not limited to a specific material in this invention and can be selected from existing technologies, as long as it can isolate the effects other than the applied gravity. However, preferably, the shape of the isolation member is the same as the bottom shape of the transducer 8.

[0028] In this invention, the change of positive pressure can be achieved by changing the weight of counterweight 9, and this change can be observed by reading the value on the positive pressure measuring instrument 4.

[0029] A transverse moving guide rail 12 is provided on the positive pressure force gauge 4 via a guide rail fixing fixture 11, and a transverse moving slider 13 is movably mounted on the transverse moving guide rail 12. A workpiece fixing fixture 14 for fixing the workpiece 27 is fixed on the transverse moving slider 13, and the workpiece 27 can be fixed on the upper surface of the workpiece fixing fixture 14. A test platform drive shaft 15 for pulling the workpiece fixing fixture 14 to generate a moving tendency or movement is also provided on one side of the workpiece fixing fixture 14.

[0030] Reference Appendix Figure 1 , 2 The drive platform 2 has a housing 16, on which a drive motor 17 is fixed. The output shaft of the drive motor 17 is connected to one end of a transmission screw 18. The transmission screw 18 is located inside the housing 16, and the other end of the transmission screw 18 is rotatably supported on a screw support seat 19. The drive motor 17 can drive the transmission screw 18 to rotate forward / reverse within the housing 16.

[0031] Reference Appendix Figure 3A lead screw nut 20 is provided on the lead screw 18, and the lead screw nut 20 is fixedly connected to the lead screw nut seat 21. The lead screw nut seat 21 has a through hole in the middle and is sleeved on the lead screw 18. Since the two sides of the lead screw nut seat 21 abut against the two inner sides of the outer casing 16, when the drive motor 17 drives the lead screw 18 to rotate, the lead screw nut 20 will push the lead screw nut seat 21 to move back and forth inside the outer casing 16.

[0032] The lead screw nut seat 21 is a block structure. In order to prevent the lead screw nut seat 21 from interfering with the transmission lead screw 18 when it is driven to move, a lead screw nut 20 is also provided on the other side of the lead screw nut seat 21. The lead screw nut 20 is also provided on the transmission lead screw 18.

[0033] A transmission fixture 22 is also provided above the lead screw nut seat 21. One end of the friction sensor 24 is connected to the transmission fixture 22 through an internal and external thread conversion joint 23, and the other end is connected to the drive table transmission shaft 25.

[0034] The drive stage transmission shaft 25 is connected to the test stage transmission shaft 15 via a coupling 26, thereby driving the workpiece to perform reciprocating motion or a tendency to perform reciprocating motion. As the drive stage transmission shaft 25 reciprocates, the friction sensor 24 can read the magnitude of the axial tensile force or compressive force, which is the friction force.

[0035] The pressure value acting on the workpiece 27 is obtained by calculating the readings from the normal force measuring instrument 4. The friction force sensor 24 is used to calculate a more accurate friction force value on the workpiece 27. The friction coefficient can be obtained by dividing the friction force value by the pressure value.

[0036] By changing the ultrasonic action of transducer 8 or changing the weight of counterweight 9, the two parameters can be changed individually or simultaneously. Therefore, the measurement platform of the present invention can measure the tribological properties of workpiece 27 under different ultrasonic actions, as well as the tribological properties of workpiece 27 under different counterweight weights, and can also determine the influence of the two combined actions on the tribological properties of the workpiece.

[0037] The present invention can change the moving speed of the workpiece 27 by changing the rotation speed of the drive motor 17, and measure the effect of ultrasonic action on the tribological properties of the workpiece 27 at different speeds.

[0038] It should also be mentioned that the measuring platform of the present invention can also measure the effect of ultrasonic action on the tribological properties of different workpieces or the same workpiece 27 under different conditions such as temperature, humidity, lubrication (different lubricants), and roughness.

[0039] This invention can not only measure the tribological properties of moving surfaces, but also calculate the effect of ultrasonic vibration on tribological properties under interference fit (such as press-fitted workpieces), and can quantitatively analyze the effect of ultrasonic action on milling.

[0040] The study on the effects of ultrasonic vibration under interference fit can be applied to the installation of fixed workpieces, and to how to remove the workpiece by applying ultrasonic action when the workpiece cannot be removed normally.

[0041] In another embodiment of the invention, shutting down Figure 1 The transducer 8 in the vertical direction applies ultrasonic action to another transducer in the same direction as the movement direction of the workpiece 27, and obtains the effect of the transducer in the same direction as the movement direction of the workpiece 27 on the tribological properties of the workpiece 27 when the workpiece 27 is under pressure.

[0042] Related to this embodiment, by changing the direction of action of another transducer, the ultrasonic action of another transducer is applied in the opposite direction of the movement direction of the workpiece 27, and the effect of the transducer in the opposite direction of the movement direction of the workpiece 27 on the tribological properties of the workpiece 27 when the workpiece 27 is under pressure is obtained.

[0043] Furthermore, in this embodiment, the invention can increase the number of another transducer, for example, by simultaneously applying ultrasonic action in the same and opposite directions of the workpiece 27's movement direction, or by considering the influence of different ultrasonic actions applied by different other transducers on the workpiece's tribological properties.

[0044] Furthermore, in this embodiment, the present invention can also determine the tribological properties for different shapes of workpiece 27.

[0045] This invention provides a measurement platform capable of revealing the effects of ultrasound on the tribological properties of workpieces under various conditions, including normal pressure, workpiece movement speed, temperature, humidity, lubrication, roughness, and interference fit. More importantly, due to its simple structure, this invention allows for the addition of measuring equipment to measure the effects of ultrasound on workpiece tribological properties under a wider range of conditions. For example, it can measure the effects of applying ultrasound in the same direction, different directions, or at an angle on the tribological properties of the workpiece, and it can also measure the effect of the combination of multiple transducers on the tribological properties of the workpiece. The drive motor of this invention uses a high-precision servo motor, enabling more precise workpiece actuation. This invention can provide measurements of workpiece tribological properties under numerous transducer states or normal pressure conditions, requiring only simple data processing and possessing good scalability.

[0046] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A platform for measuring the tribological properties of materials under / without ultrasonic stimulation, characterized in that: The tribological performance testing platform includes a testing platform (1) and a driving platform (2), which are connected by a coupling (26). The test platform (1) is used to support the workpiece (27), apply positive pressure and ultrasonic action to the workpiece (27), and measure the positive pressure; The drive platform (2) is used to make the workpiece move in different states, thereby generating friction and measuring the friction.

2. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 1, characterized in that: The test platform (1) has a base plate (3) for supporting the entire test platform (1), and a positive pressure force gauge (4) is fixed in the middle of the base plate (3); longitudinal moving guide rails (5) are provided on both sides of the base plate (3) and on both sides of the positive pressure force gauge (4) in the vertical direction. Longitudinal moving sliders (6) are provided on the longitudinal moving guide rails (5) on both sides. The two ends of the ultrasonic transducer fixing fixture (7) are respectively connected to the longitudinal moving sliders (6). A transducer (8) is provided in the middle of the ultrasonic transducer fixing fixture (7). A transverse moving guide rail (12) is provided on the positive pressure force measuring instrument (4) via a guide rail fixing fixture (11), and a transverse moving slider (13) is movably provided on the transverse moving guide rail (12); a workpiece fixing fixture (14) for fixing the workpiece (27) is fixed on the transverse moving slider (13), and the workpiece (27) is fixed on the upper surface of the workpiece fixing fixture (14).

3. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 2, characterized in that: A counterweight fixing shaft (10) coaxial with the transducer (8) is provided on the bottom of the transducer (8), and the counterweight (9) passes through the counterweight fixing shaft (10).

4. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 3, characterized in that: The drive platform (2) has a housing (16), on which a drive motor (17) is fixed. The output shaft of the drive motor (17) is connected to one end of a transmission screw (18). The transmission screw (18) is located inside the housing (16), and the other end of the transmission screw (18) is rotatably supported on a screw support seat (19). The drive motor (17) drives the transmission screw (18) to rotate in the forward / reverse direction inside the housing (16). A lead screw nut (20) is provided on the lead screw (18), and the lead screw nut (20) is fixedly connected to the lead screw nut seat (21). The lead screw nut seat (21) has a through hole in the middle, and it is sleeved on the lead screw (18). The two sides of the lead screw nut seat (21) abut against the two inner sides of the outer casing (16); A transmission fixture (22) is also provided above the lead screw nut seat (21). One end of the friction sensor (24) is connected to the transmission fixture (22) through an internal and external thread conversion joint (23), and the other end is connected to the drive table transmission shaft (25).

5. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 4, characterized in that: The drive shaft (25) of the drive stage is connected to the drive shaft (15) of the test stage via a coupling (26).

6. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 5, characterized in that: The lead screw nut seat (21) is a block structure. In order to prevent the lead screw nut seat (21) from interfering with the transmission lead screw (18) when it is driven to move, a lead screw nut (20) is also provided on the other side of the lead screw nut seat (21). The lead screw nut (20) is also provided on the transmission lead screw (18).

7. The tribological property testing platform for materials under / without ultrasonic irradiation according to claim 6, characterized in that: The pressure value acting on the workpiece (27) is obtained by calculating the readings of the positive pressure force gauge (4). The friction force value of the workpiece (27) is obtained by calculating the readings of the friction force sensor (24). The friction coefficient can be obtained by dividing the friction force value by the pressure value.

8. A method for determining the tribological properties of materials under ultrasonic treatment, characterized in that: The tribological property testing platform, as described in any one of claims 1-7, for materials subjected to ultrasonic treatment / without ultrasonic treatment, comprises the following steps: The workpiece (27) is fixed on the workpiece fixing fixture (14); Select the weight of the counterweight (9) and fix the counterweight (9) on the counterweight block fixing shaft (10); Start the transducer (8) and the drive motor (17). Read the data from the friction sensor (24) and the normal force measuring instrument (4) to obtain the current operating status of the transducer (8); Change the operating state of the transducer (8) and / or the weight of the counterweight (9), and read the data from the friction sensor (24) and the positive pressure force gauge (4); Calculate the effect of different ultrasonic effects provided by the transducer (8) on the friction coefficient.

9. The method for determining the tribological properties of materials under ultrasonic treatment according to claim 8, characterized in that: Turn off the transducer (8), apply the new transducer action in the same direction or opposite direction or in both directions of the movement direction of the workpiece (8); calculate the effect of different ultrasonic actions provided by the transducer (8) on the friction coefficient.

10. The method for determining the tribological properties of materials under ultrasonic treatment according to claim 8 or 9, characterized in that: Change the state of the workpiece (27) and calculate the effect of different ultrasonic effects provided by the transducer (8) on the coefficient of friction.

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