An adaptive surface texture for a frictional pair

Abstract

The application discloses a kind of adaptive surface texture for friction pair, comprising: friction pair body, a plurality of micro-texture feature shapes are opened on the surface of the friction pair body;The micro-texture feature shape is provided with texture cover layer, and the texture cover layer includes substrate and membrane layer arranged on substrate, and the substrate is arranged on the micro-texture feature shape;Regulation component, the pressure sensor and magnetic field coil and controller are arranged on the surface or inside of friction pair body, and the pressure sensor and magnetic field coil are all connected with the signal of controller.According to the application, the magnetic field intensity and distribution can be adjusted according to the working condition of engineering friction pair, so that the engineering friction pair is always within its optimal working range, and the friction pair has good tribological properties under different working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, control, and particularly relates to a self-adaptive surface texture for a friction pair. BACKGROUND

[0002] Device damage has always been a concern, and accidental and incidental failures are unpredictable, but how to prolong the service life of the machine and reduce friction and wear is something that can be studied. Friction of equipment means energy loss, and it has an impact on the stable operation of the equipment. Tribology researchers have found that smooth surfaces do not mean lower wear, and if some regular arrangement of fine textures is prepared on the surface of the friction pair, it can have an unexpected effect. The existence of micro-texture not only intercepts the abrasive particles generated by friction to avoid "three-body wear", but also stores lubricating oil to improve the lubrication effect, and the dynamic pressure lubrication effect generated also improves the carrying capacity of the oil film, reducing friction and wear.

[0003] There are many processing methods for preparing micro-texture, such as laser surface texture processing, micro-electrode discharge processing, focused ion beam, electrochemical corrosion, ultrasonic processing, shot blasting / sand blasting processing, additive manufacturing, embossing (molding processing), thermal processing, etc. In order to better improve the friction reduction effect or realize more functions of micro-texture, some people have proposed micro-nano composite structures, which first process micron-level structures on the surface of the material, and then process nano-level structures. The methods that can be used at this time include: micro-milling and alkali heat processing / anodic oxidation, laser processing and acid corrosion, sandblasting and multiple acid etching / alkali heat processing, etc.

[0004] Micro-texture preparation is often one-time, and its friction performance is also determined after processing. Perhaps the micro-texture prepared has a friction reduction effect under the current working conditions, but the real friction environment will change, and when the external conditions change, the micro-texture prepared originally may not be sufficient to achieve effective dynamic pressure lubrication, and the friction reduction effect is not obvious, or the advantages of texturing are not shown. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a self-adaptive surface texture for a friction pair, which can adjust the magnetic field strength and distribution according to the working condition of the engineering friction pair, so that the engineering friction pair is always within its optimal working range, and ensures that the friction pair has good tribological properties under different working conditions. In order to achieve the above-mentioned purposes and other advantages according to the present application, a self-adaptive surface texture for a friction pair is provided, comprising:

[0006] A friction pair body, a plurality of micro-texture feature shapes are formed on the surface of the friction pair body;

[0007] The micro-texture feature shape is provided with a texture cover layer, and the texture cover layer comprises a substrate and a film layer provided on the substrate.

[0008] The regulating assembly is provided with a pressure sensor, a magnetic field coil and a controller on the surface or inside of the friction pair body, wherein the pressure sensor and the magnetic field coil are signal connected with the controller.

[0009] Preferably, the micro-texture feature shape is a groove shape, and is processed on the surface of the friction pair body by honing technology, laser surface texturing processing technology, reactive ion etching technology, pressure etching technology, surface shot peening processing technology, ultrasonic impact processing technology or photolithography micro-electrochemical machining technology.

[0010] Preferably, the substrate is a magneto-rheological plastic body, and the substrate is processed on the surface of the micro-texture feature shape by a spraying process, and the friction coefficient of the substrate is less than the friction coefficient of the friction pair body.

[0011] Preferably, the film layer is a magneto-rheological elastomer film, and the film layer is embedded on part of the upper surface of the substrate by a stamping method.

[0012] Preferably, the friction coefficient and the elastic modulus of the film layer are less than the friction coefficient and the elastic modulus of the friction pair body, and the elastic modulus of the film layer is greater than that of the substrate.

[0013] Preferably, when the pressure sensor measures the oil film pressure, the pressure sensor is embedded on the surface of the friction pair body, and the upper surface of the pressure sensor is located below the height of the surface of the friction pair body.

[0014] Preferably, when the pressure sensor measures the contact pressure of the friction pair, the pressure sensor is embedded inside the friction pair body, and the force receiving surface of the pressure sensor is tightly attached to the material of the friction pair body and is parallel to the friction surface.

[0015] Preferably, the number of the magnetic field coils is the same as the number of the film layers, the magnetic field coils are located directly below the film layers, the magnetic field generated by the magnetic field coils covers the texture cover layer, the range of the magnetic field generated by each magnetic field coil is controlled, and the influence of the generated magnetic field on the surrounding texture cover layers is reduced.

[0016] Preferably, the pressure sensor is a plurality of pressure sensors, and the pressure sensors are uniformly distributed on the surface or inside of the friction pair body, and the pressure sensor and the magnetic field coil are in a one-to-many relationship, and the value reflected by each pressure sensor will indirectly affect the size of the current of the surrounding several magnetic field coils.

[0017] The present application has the beneficial effect that the surface of the friction pair body is processed with micro-texture feature shape, and further comprises a texture cover layer arranged in the micro-texture feature shape of the surface of the friction pair body and in close contact with the micro-texture feature shape. The regulating device of the surface texture receives the pressure change under the working condition through the pressure sensor and transmits to the controller, the controller changes the magnetic field strength by adjusting the current of the magnetic field coil, and the texture cover layer changes under the action of the magnetic field force. As a part of the micro-texture, the change of the texture cover layer affects the geometric parameters of the micro-texture, thereby improving the friction performance, so that the engineering friction pair is always within its optimal working range, and the friction pair has good tribological properties under different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure diagram of adaptive surface texture for friction pair according to the present application;

[0019] Figure 2 Distribution example diagram of texture cover layer, pressure sensor under different surface micro-textures of the present friction pair body according to the adaptive surface texture for friction pair of the present application;

[0020] Figure 3 Diagram of surface texture deformation of the friction pair after being loaded according to the adaptive surface texture for friction pair of the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] REFERENCE Figures 1-3 An adaptive surface texture for friction pair, comprising: a friction pair body 1, a plurality of micro-texture feature shapes 2 are arranged on the surface of the friction pair body 1;

[0023] A texture cover layer is arranged on the micro-texture feature shape 2, and the texture cover layer comprises a substrate 4 and a film layer 5 arranged on the substrate 4, and the substrate 4 is arranged on the micro-texture feature shape 2.

[0024] A regulating assembly is arranged between the pressure sensor 3 on the surface or in the interior of the friction pair body 1 and the magnetic field coil 7 and the controller 8, wherein the pressure sensor 3 and the magnetic field coil 7 are both signal connected with the controller 8.

[0025] Further, the micro-texture feature shape 2 is groove-shaped, and is processed on the surface of the friction pair body 1 by honing technology, laser surface texturing processing technology, reactive ion etching technology, pressure etching technology, surface shot peening processing technology, ultrasonic impact processing technology or photolithography micro-electrochemical machining technology. The micro-texture feature shape 2 includes circular pits and grooves (V-shaped grooves), and the size and shape of the film layer 5 can be designed according to the micro-texture feature shape, and the arrangement and gap are also appropriate.

[0026] Further, the substrate 4 is a magneto-rheological plastic body, and is processed on the surface of the micro-texture feature shape 2 by a spraying process. The friction coefficient of the substrate 4 is smaller than that of the friction pair body 1, and the substrate 4 has a lower yield strength and a certain plastic behavior.

[0027] Further, the film layer 5 is a magneto-rheological elastomer film, and is embedded on part of the upper surface of the substrate 4 by a stamping method. The friction coefficient and the elastic modulus of the film layer 5 are smaller than those of the friction pair body 1, and the elastic modulus of the film layer 5 is greater than that of the substrate 4. The shape and size of the magneto-rheological elastomer film are determined according to the micro-texture feature shape, and the film layer 5 is arranged in the micro-texture feature shape 2 at intervals according to a certain rule. The film layer 5 is convex downward and concave-shaped when subjected to a magnetic field.

[0028] Further, when the pressure sensor 3 measures the oil film pressure, the pressure sensor 3 is embedded on the surface of the friction pair body 1, and the upper surface of the pressure sensor 3 is at a height lower than that of the surface of the friction pair body 1. When the pressure sensor 3 measures the friction pair contact pressure, the pressure sensor 3 is embedded in the friction pair body 1, and the force receiving surface of the pressure sensor 3 is in close contact with the material of the friction pair body 1 and is parallel to the friction surface.

[0029] Further, the number of magnetic field coils 7 is the same as that of the film layer 5, and the magnetic field coils 7 are located directly below the film layer 5. The magnetic field 6 generated by the magnetic field coils 7 covers the texture covering layer. The pressure sensor 3 is several, and is uniformly distributed on the surface or inside the friction pair body 1. The pressure sensor 3 and the magnetic field coil 7 are in a one-to-many relationship. The value reflected by each pressure sensor 3 will indirectly affect the size of the current passing through the surrounding several magnetic field coils 7.

[0030] The controller 8 receives the signal of the pressure sensor 3, and uses the distance between the pressure sensor 3 and the magnetic field coil 7 and the difference in the data measured by the adjacent pressure sensor 3 as the basis for judgment, and controls the current passing through the magnetic field coil 7, so as to change the strength of the magnetic field 6.

[0031] As shown in FIG. 1, the friction pair body 1 is a friction pair body of a friction pair, and is provided with a micro-texture feature shape 2, a substrate 4, a film layer 5, a pressure sensor 3 and a magnetic field coil 7. Figure 1 , 3As shown, the adaptive surface texture uses a substrate 4 with lower friction coefficient, lower yield strength and certain plastic behavior, a magneto-rheological plastic, and a film layer 5 with lower elastic modulus and lower friction coefficient, a magneto-rheological elastic film, as the texture cover layer, covering the micro-texture feature shape 2 of the friction pair body 1. When the friction pair is in light load working condition, as shown in Figure 3 a), the pressure value measured by the pressure sensor 3 is small, the controller 8 controls the current flowing through the magnetic field coil 7 according to the pressure change at each position, the magnetic field 6 generated by the current through the coil is small, and the film layer 5 only has a small deformation 9 under the action of the magnetic field, slightly extruding the substrate 4, so that the surface of the friction pair body 1 has micro-texture features with small depth; when the friction pair is in medium / heavy load working condition, as shown in Figure 3 b), the pressure measured by the pressure sensor 3 is large, the controller 8 adjusts the output current according to the force on the friction pair, the current through the magnetic field coil 7 at each position is increased (the magnetic field coil 7 at each position is controlled, and the current through the coil is increased to different degrees), the magnetic field 6 generated by the magnetic field coil 7 is increased, the film layer 5 deforms greatly under the action of the magnetic field 6, and the substrate 4 is extruded to a large extent, so that the surface of the friction pair body 1 has micro-texture features with large depth.

[0032] Within a proper range, when the micro-texture depth increases, the load-carrying capacity of the oil film also increases, and the friction coefficient decreases, so Figure 3 b) the load-carrying capacity of the micro-texture is greater, and the friction performance is better. When the design parameters of the micro-texture feature shape 2 of the surface of the friction pair body 1 are determined, and the physical parameters (yield strength, elastic modulus, friction coefficient) of the materials of the substrate 4 and the film layer 5 are properly selected, the friction pair with the adaptive texture surface can be applied to various working conditions. The film layer 5 deforms and extrudes the substrate part 4 of the texture cover layer under the action of the magnetic field 6 formed by the feedback of the control assembly, so that the geometric parameters of the surface texture features change, and thus the friction performance of the friction pair is improved under any working condition, and the working efficiency and the service life of the parts are improved.

[0033] The geometric parameters of the adaptive surface texture are not fixed, but change with the working conditions of the friction pair, achieving the effect of adaptation, and ensuring that the friction pair with the adaptive surface texture has good tribological performance under different working conditions.

[0034] The number of devices and the processing scale described herein are used to simplify the description of the present application, and the application, modification and change of the present application are obvious to those skilled in the art.

[0035] While embodiments of the application have been disclosed in connection with the above specification, it will be evident to those skilled in the art that many modifications, substitutions, and alterations to the embodiments of the application can be made and that many specifically protected details shown can be substituted by other specifically protected details. Accordingly, it is intended that the application not be limited to the specific details shown and described, but that it be given broadest scope indicated by the claims and their equivalents.

Claims

1. An adaptive surface texture for friction pairs, characterized in that, include: Friction replica (1), the surface of which is provided with multiple microtexture feature shapes (2); The microtexture feature shape (2) is provided with a textured covering layer, the textured covering layer including a substrate (4) and a film layer (5) disposed on the substrate (4), the substrate (4) being disposed on the microtexture feature shape (2); The control component includes a pressure sensor (3) and a magnetic field coil (7) and a controller (8) disposed on or inside the surface of the friction replica (1), wherein the pressure sensor (3) and the magnetic field coil (7) are both connected to the controller (8) via signal. The substrate (4) is a magnetorheological plastic body; the film layer (5) is a magnetorheological elastomer film; the control component is used to adjust the magnetic field strength generated by the magnetic field coil (7) through the controller (8) according to the pressure signal measured by the pressure sensor (3), so that the textured cover layer undergoes controllable deformation, thereby adaptively changing the geometric parameters of the microtexture feature shape (2).

2. The adaptive surface texture for a friction pair as described in claim 1, characterized in that, The microtexture feature shape (2) is groove-shaped and is processed on the surface of the friction copy body (1) by honing technology, laser surface texturing technology, reactive ion etching technology, embossing technology, surface shot peening technology, ultrasonic impact processing technology or photolithography micro-electrolytic processing technology.

3. The adaptive surface texture for a friction pair as described in claim 2, characterized in that, Furthermore, the substrate (4) is processed on the surface of the microtextured shape (2) by a spraying process, and the friction coefficient of the substrate (4) is less than that of the friction copy (1).

4. The adaptive surface texture for a friction pair as described in claim 3, characterized in that, Furthermore, the film layer (5) is embedded in part of the upper surface of the substrate (4) by imprinting.

5. An adaptive surface texture for a friction pair as described in claim 4, characterized in that, The friction coefficient and elastic modulus of the film layer (5) are both less than those of the friction copy (1), and the elastic modulus of the film layer (5) is greater than that of the substrate (4).

6. The adaptive surface texture for a friction pair as described in claim 1, characterized in that, When the pressure sensor (3) measures the oil film pressure, the pressure sensor (3) is embedded on the surface of the friction replica (1), and the height of the upper surface of the pressure sensor (3) is below the height of the surface of the friction replica (1).

7. An adaptive surface texture for a friction pair as described in claim 6, characterized in that, When the pressure sensor (3) measures the contact pressure of the friction pair, the pressure sensor (3) is embedded inside the friction replica (1), and the force-bearing surface of the pressure sensor (3) is in close contact with the material of the friction replica (1) and parallel to the friction surface.

8. An adaptive surface texture for a friction pair as described in claim 1, characterized in that, The number of magnetic field coils (7) is the same as the number of membrane layers (5), and the magnetic field coils (7) are located directly below the membrane layers (5), and the magnetic field (6) generated by the magnetic field coils (7) covers the textured covering layer.

9. An adaptive surface texture for a friction pair as described in claim 1, characterized in that, There are several pressure sensors (3), and the pressure sensors (3) are evenly distributed on the surface or inside of the friction copy body (1). The pressure sensors (3) and the magnetic field coils (7) have a one-to-many relationship. The value reflected by each pressure sensor (3) will indirectly affect the magnitude of the current flowing through the surrounding magnetic field coils (7).

Images