Flat-ended "v"-groove textured surfaces and tribological pairs

Abstract

The application discloses a flat-head V-shaped groove textured surface and a friction pair, which comprises a surface and a plurality of groove textures recessed in the surface, the surface has a moving direction, the groove texture has a flat-head part and two side edge parts, the side edge part has a front end located in front in the moving direction and a rear end located in back in the moving direction, the two side edge parts extend to the flat-head part from the rear end to the front end gradually and approach each other, and the flat-head part extends perpendicularly to the moving direction. The flat-head V-shaped groove texture can generate a large-area high-pressure area and a large pressure peak in the flat-head part when the lubricating oil moves along the moving direction under the driving of the surface, and a small cavitation area is generated at the rear end of the two side edge parts, so that the low-pressure area is effectively reduced, and the opened two side edge parts can avoid the mutual influence of the high-pressure area and the low-pressure area between the adjacent two groove textures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of friction pair, in particular, to a flat head "V" shaped groove textured surface and friction pair. BACKGROUND

[0002] Early tribology theory believes that surface roughness causes friction, the smoother the contact surface, the smaller the wear. Generally, reducing surface roughness can reduce the friction coefficient, but the surface friction coefficient obtained after superfinishing is actually increased. In recent years, a large number of scholars' researches show that a series of micro topographies with certain distribution rules and sizes on the contact surface can improve the tribological properties of the contact surface. This micro topography that uses different processing methods to manufacture a certain shape, size and arrangement pattern on the material surface to change the tribological properties of the material surface is called surface texture. Surface texture is a novel and obvious surface modification technology due to its good friction reduction and wear resistance.

[0003] In the field of mechanical engineering, the surface texture of the friction pair has a great influence on the load capacity, friction reduction and wear resistance, friction coefficient, running stability, reliability and service life of the friction pair, which may have positive effects or no effect or even make these performance parameters worse. This mainly depends on the parameters of the texture, such as shape, size and distribution, so it is necessary to reasonably design the parameters of the surface texture of the friction pair to improve the tribological properties of the friction pair and prolong the service life of the mechanical parts. The traditional texture design method mainly uses trial and error method to compare the texture parameters imagined by limited individuals through experiments or numerical calculations, and selects the texture parameters with the best performance indicators. At present, the surface texture shape of the friction pair mainly uses regular shapes such as circle, ellipse, triangle, rectangle, diamond and trapezoid. The circular pit shape is simple, has high processing efficiency and good tribological properties, and has been widely used.

[0004] Although these regular shape textures have been widely used, these shapes are not the best. Under the hydrodynamic lubrication state, the hydrodynamic pressure effect generated by the surface texture plays a decisive role in the oil film bearing capacity, but the hydrodynamic pressure effect generated by the regular shape texture is not the strongest. Therefore, it is necessary to optimize the shape of the texture to generate the maximum oil film bearing capacity and improve the lubrication performance of the friction pair. SUMMARY

[0005] The purpose of the present application is to provide a flat head "V" shaped groove textured surface and friction pair to solve the technical problem that the regular shape texture cannot generate greater oil film bearing capacity and improve the lubrication performance of the friction pair.

[0006] The above object of the present application can be achieved by the following technical solutions.

[0007] The present application provides a flat "V" shaped groove textured surface, comprising a surface and a plurality of groove textures recessed in the surface, the surface has a moving direction, the groove texture has a flat head and two side edge portions, the side edge portions have a front end in front of the moving direction and a rear end behind the moving direction, the two side edge portions gradually approach each other from the rear end to the front end to the flat head, and the flat head is arranged perpendicular to the moving direction.

[0008] In an embodiment of the present application, a plurality of groove textures are arranged along the moving direction to form a first groove texture distribution structure.

[0009] In an embodiment of the present application, a plurality of groove textures are arranged along the perpendicular direction of the moving direction to form a second groove texture distribution structure.

[0010] In an embodiment of the present application, the moving direction is a straight line direction or a rotating direction.

[0011] In an embodiment of the present application, the rear end of the side edge portion is a sharp end structure.

[0012] In an embodiment of the present application, the two side edge portions have outer side edges arranged away from each other, and the outer side edges of the two side edge portions can be extended to form a front included angle, the angle of the front included angle is 30°-60°.

[0013] In an embodiment of the present application, the two side edge portions have inner side edges arranged close to each other, and the inner side edges of the two side edge portions intersect to form a rear included angle, the angle of the rear included angle is 45°-90°.

[0014] In an embodiment of the present application, the outer contour of the groove texture has eighteen characteristic points, the eighteen characteristic points are connected in turn by eighteen line segments, and the dimensionless length of the line segment is 0.125-0.3271.

[0015] In the embodiment of the present application, a rectangular coordinate system is established with the first feature point as the origin, and the dimensionless coordinate values of the eighteen feature points in the rectangular coordinate system are respectively: (0, 0), (0.2713, 0), (0.5736, 0.1250), (0.7984, 0.2500), (1, 0.3750), (1, 0.5000), (1, 0.6250), (0.7907, 0.7500), (0.5969, 0.8750), (0.3256, 1), (0, 1), (0.2403, 0.8750), (0.4729, 0.7500), (0.5814, 0.6250), (0.7132, 0.5000), (0.5659, 0.3750), (0.4419, 0.2500), (0.2248, 0.1250).

[0016] In the embodiment of the present application, a rectangular coordinate system is established with the first feature point as the origin, and the dimensionless coordinate values of the eighteen feature points in the rectangular coordinate system are respectively: (0, 0), (0.2500, 0), (0.5000, 0.1250), (0.7500, 0.2500), (1, 0.3750), (1, 0.5000), (1, 0.6250), (0.7500, 0.7500), (0.5000, 0.8750), (0.2500, 1), (0, 1), (0.2000, 0.8750), (0.4000, 0.7500), (0.6000, 0.6250), (0.8000, 0.5000), (0.6000, 0.3750), (0.4000, 0.2500), (0.2000, 0.1250).

[0017] In the embodiment of the present application, the depth of the groove texture is 5-20 μm, and the area density of the groove texture is 20-40%.

[0018] The present application also provides a friction pair comprising the flat-head "V"-shaped groove textured surface.

[0019] The present application has the following characteristics and advantages:

[0020] The flat-head "V"-shaped groove textured surface and friction pair of the present application make the groove texture generally "V"-shaped by extending the two side edges to gradually approach each other, and make the groove texture generally flat-head "V"-shaped by forming a flat-head part extending perpendicularly to the movement direction at the front end of the two side edges, so that when the lubricating oil is driven by the surface to move on the surface along the movement direction, on one hand, a large-area high-pressure zone and a larger pressure peak can be generated at the flat-head part, on the other hand, a very small cavitation zone can be generated at the rear end of the two side edges, thereby effectively reducing the area of the low-pressure zone, and on the other hand, the simultaneously opened two side edges can avoid the mutual influence of the high-pressure zone and the low-pressure zone between the adjacent two groove textures, and the three reasons can make the present application obtain excellent tribological properties under the condition of hydrodynamic lubrication and significantly improve the oil film carrying capacity between the friction pairs. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 is a schematic diagram of the outer contour of the flat-head "V"-shaped groove texture in the present application.

[0023] Figure 2 is a white light micro-morphology diagram of the flat-head "V"-shaped groove texture in the present application.

[0024] Figure 3 is a pressure distribution nephogram of the flat-head "V"-shaped groove texture in the first embodiment of the present application.

[0025] Figure 4 is a pressure distribution nephogram of the flat-head "V"-shaped groove texture in the second embodiment of the present application.

[0026] Figure 5 is a pressure distribution nephogram of the circular groove texture in the prior art.

[0027] Figure 6 is a cross-sectional profile diagram of the flat-head "V"-shaped groove texture in the present application.

[0028] Figure 7 is a structural schematic diagram of the friction pair in the present application in linear motion.

[0029] Figure 8 is a structural schematic diagram of the friction pair in the present application in rotary motion.

[0030] Figure 9This is a design drawing of the outer contour of the flat-headed "V"-shaped groove texture in the first embodiment of the present invention.

[0031] Figure 10 This is a design drawing of the outer contour of the flat-headed "V"-shaped groove texture in the second embodiment of the present invention.

[0032] Figure 11 This is a comparison chart of the friction performance of the first embodiment of the present invention and the prior art.

[0033] Figure 12 This is a comparison diagram of the friction performance between the second embodiment of the present invention and the prior art.

[0034] In the picture:

[0035] 1. Surface; 2. Groove texture; 21. Side; 211. Front end; 212. Rear end; 213. Outer edge; 214. Inner edge; 215. Connecting edge; 216. Tip structure; 22. Flat head. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Implementation Method 1

[0038] like Figures 1-2 As shown, the present invention provides a flat-head "V"-shaped groove textured surface, including a surface 1 and a plurality of groove textures 2 recessed in the surface 1. The surface 1 has a movement direction F. The groove textures 2 have a flat head 22 and two side portions 21. The side portions 21 have a front end 211 located in front in the movement direction F and a rear end 212 located in the movement direction F. The two side portions 21 extend from their rear end 212 to their front end 211 gradually approaching each other to the flat head 22. The flat head 22 is arranged perpendicular to the movement direction (i.e., along the direction T).

[0039] Combination Figure 3 and Figure 4As shown, the flat-head "V"-shaped groove textured surface of the present application makes the groove texture 2 generally "V"-shaped by extending the two side edges 21 gradually close to each other, and makes the groove texture 2 generally flat-head "V"-shaped by forming a flat-head 22 extending perpendicularly to the movement direction at the front end 211 of the two side edges 21, so that when the lubricating oil is driven by the surface 1 to move along the movement direction on the surface 1, on one hand, a large area of high pressure zone and a larger pressure peak value can be generated at the flat-head 22, on the other hand, a very small cavitation zone can be generated at the rear end 212 of the two side edges 21, thereby effectively reducing the area of low pressure zone, and on the other hand, the simultaneously opened two side edges 21 can avoid the mutual influence of the high pressure zone and the low pressure zone between the adjacent two groove textures 2, and the three reasons make the present application can obtain excellent tribological properties under the condition of hydrodynamic lubrication, and significantly improve the oil film carrying capacity between the friction pairs.

[0040] In addition, the present application has the following advantages: Figure 3 and Figure 4 Compared with Figure 5 As shown, the area of the high pressure zone formed near the circular groove texture in the prior art is obviously smaller than the area of the high pressure zone formed near the flat-head 22 of the flat-head "V"-shaped groove texture 2 in the present application, and the high pressure peak value of the high pressure zone in the prior art is also obviously lower than the high pressure peak value of the high pressure zone in the present application.

[0041] Specifically, in combination with Figure 6 As shown, the depth of the groove texture 2 is 5 μm-20 μm; the area density of the groove texture 2 is 20%-40%. A plurality of groove textures 2 are arranged along the movement direction F to form a first groove texture 2 distribution structure. A plurality of groove textures 2 are arranged along the vertical direction T of the movement direction F to form a second groove texture 2 distribution structure.

[0042] As shown in Figure 1 In order to further reduce the cavitation zone generated at the rear end 212 of the side edge 21 to further reduce the area of the low pressure zone, in the embodiment of the present application, the rear end 212 of the side edge 21 is in a pointed end structure 216. Specifically, the pointed end structure 216 is arranged towards the rear of the movement direction F. The two side edges 21 have an outer side edge 213 arranged away from each other and an inner side edge 214 arranged close to each other. The rear end 212 of the inner side edge 214 and the rear end 212 of the outer side edge 213 are connected by a connecting edge 215, and the outer side edge 213 and the inner side edge 214 are both inclinedly arranged relative to the movement direction F, the connecting edge 215 is arranged along the movement direction, and the rear end 212 of the connecting edge 215 is connected with the rear end 212 of the outer side edge 213 to form the pointed end structure 216.

[0043] As shown in Figure 1As shown, the front end 211 of the outer side edge 213 of the two side edge portions 21 is connected with the two ends of the flat head portion 22. The outer side edge 213 of the two side edge portions 21 is extended to intersect to form a front included angle a, and the angle of the front included angle a is 30°-60°. The inner side edge 214 of the two side edge portions 21 is intersected to form a rear included angle β, and the angle of the rear included angle β is 45°-90°.

[0044] As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface. Figure 7 Figure 8 As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface.

[0045] As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface. Figure 7 As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface.

[0046] As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface. Figure 8 As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface.

[0047] As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface. Figure 9 Figure 10 As shown in FIG. 1, the flat head "V"-shaped groove textured surface of the present application can be applied to a friction pair as a friction surface.

[0048] ​​Specifically, a hybrid optimization algorithm based on genetic algorithm and sequential quadratic programming algorithm is used to optimize the shape of the flat-head "V" shaped groove texture on the face contact friction pair. The calculation domain of the optimization design is a fan-shaped region or a square region, the design variables are the coordinate values of the eighteen characteristic points that determine the shape of the texture, the objective function (fitness) of the optimization design is the oil film carrying capacity in the calculation domain, and the goal of the optimization design is to find the coordinate values of the eighteen characteristic points so that the oil film carrying capacity in the calculation domain reaches the maximum value. n individuals are randomly generated, which form a population, and each individual contains the coordinate values of the eighteen characteristic points that determine the specific shape of the flat-head "V" shaped groove texture. A population of texture shapes is obtained through the genetic algorithm, and then the sequential quadratic programming algorithm is used to find the local optimal solution of the texture shape. The genetic algorithm and the sequential quadratic programming algorithm are used alternately, and the oil film carrying capacity gradually increases until the oil film carrying capacity in the calculation domain remains unchanged for a certain number of generations, the iteration is stopped, and the dimensionless coordinate values of the eighteen characteristic points that determine the specific shape of the flat-head "V" shaped groove texture are output.

[0049] As shown in Figure 9 , in the first embodiment of the present application, a rectangular coordinate system is established with the first characteristic point as the origin o, wherein the x-axis of the rectangular coordinate system is arranged along the movement direction, and the y-axis is arranged perpendicular to the movement direction; the dimensionless coordinate values of the eighteen characteristic points in the rectangular coordinate system are as follows:

[0050] The coordinate value of the first characteristic point p1 is (0, 0), the coordinate value of the second characteristic point p2 is (0.2500, 0), the coordinate value of the third characteristic point p3 is (0.5000, 0.1250), the coordinate value of the fourth characteristic point p4 is (0.7500, 0.2500), the coordinate value of the fifth characteristic point p5 is (1, 0.3750), the coordinate value of the sixth characteristic point p6 is (1, 0.5000), the coordinate value of the seventh characteristic point p7 is (1, 0.6250), the coordinate value of the eighth characteristic point p8 is (0.7500, 0.7500), the coordinate value of the ninth characteristic point p9 is (0.5000, 0.8750), the coordinate value of the tenth characteristic point p 10 is (0.2500, 1), the coordinate value of the eleventh characteristic point p 11 is (0, 1), the coordinate value of the twelfth characteristic point p 12 is (0.2000, 0.8750), the coordinate value of the thirteenth characteristic point p 13 is (0.4000, 0.7500), the coordinate value of the fourteenth characteristic point p 14 is (0.6000, 0.6250), the coordinate value of the fifteenth characteristic point p 15 is (0.8000, 0.5000), the coordinate value of the sixteenth characteristic point p 16The coordinates are (0.6000, 0.3750), the seventeenth feature point p 17 The coordinates are (0.4000, 0.2500), the eighteenth feature point p 18 The coordinates are (0.2000, 0.1250).

[0051] Specifically, the eighteen feature points are connected sequentially to form eighteen line segments p1p2, p2p3, p3p, p4p5, p5p6, p... 6 p 7 p 7 p 8 p 8 p 9 p 9 p 10 p 10 p 11 p 11 p 12 p 12 p 13 p 13 p 14 p 14 p 15 p 15 p 16 p 16 p 17 p 17 p 18 p 18 The dimensionless lengths of p1 are the lines 0.2500, 0.2795, 0.2795, 0.2795, 0.1250, 0.1250, 0.2795, 0.2795, 0.2795, 0.2500, 0.2358, 0.2358, 0.2358, 0.2358, 0.2358, 0.2358, 0.2358, 0.2358, 0.2358.

[0052] like Figure 10 As shown, in the second embodiment of the present invention, the dimensionless coordinate values ​​of the eighteen feature points in the rectangular coordinate system are as follows:

[0053] The coordinate value of the first feature point p1 is (0, 0), the coordinate value of the second feature point p2 is (0.2713, 0), the coordinate value of the third feature point p3 is (0.5736, 0.1250), the coordinate value of the fourth feature point p4 is (0.7984, 0.2500), the coordinate value of the fifth feature point p5 is (1, 0.3750), the coordinate value of the sixth feature point p6 is (1, 0.5000), the coordinate value of the seventh feature point p7 is (1, 0.6250), the coordinate value of the eighth feature point p8 is (0.7907, 0.7500), the coordinate value of the ninth feature point p9 is (0.5969, 0.8750), the coordinate value of the tenth feature point p 10 is (0.3256, 1), the coordinate value of the eleventh feature point p 11 is (0, 1), the coordinate value of the twelfth feature point p 12 is (0.2403, 0.8750), the coordinate value of the thirteenth feature point p 13 is (0.4729, 0.7500), the coordinate value of the fourteenth feature point p 14 is (0.5814, 0.6250), the coordinate value of the fifteenth feature point p 15 is (0.7132, 0.5000), the coordinate value of the sixteenth feature point p 16 is (0.5659, 0.3750), the coordinate value of the seventeenth feature point p 17 is (0.4419, 0.2500), the coordinate value of the eighteenth feature point p 18 is (0.2248, 0.1250).

[0054] Specifically, the eighteen feature points are sequentially connected to form eighteen line segments p1p2, p2p3, p3p4, p4p5, p5p6, p 6 p 7 , p 7 p 8 , p 8 p 9 , p 9 p 10 , p 10 p 11 , p 11 p 12 , p 12 p 13 , p 13 p 14 , p 14 p 15 , p 15 p 16 , p 16 p 17 , p 17 p18 , p 18 The non-dimensional length of p1 is respectively 0.2713, 0.3271, 0.2572, 0.2372, 0.1250, 0.1250, 0.2438, 0.2306, 0.2987, 0.3256, 0.2709, 0.2640, 0.1655, 0.1816, 0.1932, 0.1761, 0.2505, 0.2572.

[0055] As shown in Figure 11 and Figure 12 , compared with the circular groove textured surface in the prior art, the oil film carrying capacity of the flat "V" groove textured surface of the present application is obviously improved, and the friction coefficient is obviously reduced. And by comparing the first embodiment and the second embodiment of the present application, it can be seen that by adjusting the positions of part of the feature points, the performance of the groove texture 2 is further optimized, the oil film carrying capacity is further improved, the friction coefficient is further reduced, and the friction force is also reduced.

[0056] Embodiment two

[0057] As shown in Figure 7 and Figure 8 , the present application also provides a friction pair, which comprises a flat "V" groove textured surface. The flat "V" groove textured surface constitutes the friction surface of the friction pair. The specific structure, working principle and beneficial effects of the flat "V" groove textured surface in this embodiment are the same as those of the flat "V" groove textured surface in embodiment one, and will not be repeated here.

[0058] The above only describes several embodiments of the present application, and those skilled in the art can make various modifications or changes to the embodiments of the present application according to the disclosed content of the application file without departing from the spirit and scope of the present application.

Claims

1. A flat "V" groove texturized surface characterized in that, A surface comprising a plurality of groove textures recessed in the surface, the surface having a movement direction, the groove textures having a flat head and two side edge portions, the side edge portions having a front end in front of the movement direction and a rear end behind the movement direction, the side edge portions extending from the rear end to the flat head gradually approaching each other, the flat head extending perpendicularly to the movement direction; The front ends of the outer side edges of the two side edge portions are connected to the two ends of the flat head, the outer side edges of the two side edge portions intersect to form a front included angle, the angle of the front included angle being 30°-60°; the inner side edges of the two side edge portions intersect to form a rear included angle, the angle of the rear included angle being 45°-90°.

2. The flat head "V"-shaped groove textured surface according to claim 1, wherein a plurality of the groove textures are arranged along the movement direction to form a first groove texture distribution structure.

3. The flat head "V"-shaped groove textured surface according to claim 2, wherein a plurality of the groove textures are arranged along a direction perpendicular to the movement direction to form a second groove texture distribution structure.

4. The flat head "V"-shaped groove textured surface according to claim 2, wherein the movement direction is a straight line direction or a rotational direction.

5. The flat head "V"-shaped groove textured surface according to claim 1, wherein the rear end of the side edge portion is in a pointed end structure.

6. The flat head "V"-shaped groove textured surface according to claim 1, wherein the outer contour of the groove texture has eighteen feature points, the eighteen feature points being connected by eighteen line segments in sequence, the dimensionless length of the line segment being 0.125-0.3271.

7. The flat head "V"-shaped groove textured surface according to claim 6, wherein a rectangular coordinate system is established with the first feature point as the origin, the dimensionless coordinate values of the eighteen feature points in the rectangular coordinate system being (0, 0), (0.2713, 0), (0.5736, 0.1250), (0.7984, 0.2500), (1, 0.3750), (1, 0.5000), (1, 0.6250), (0.7907, 0.7500), (0.5969, 0.8750), (0.3256, 1), (0, 1), (0.2403, 0.8750), (0.4729, 0.7500), (0.5814, 0.6250), (0.7132, 0.5000), (0.5659, 0.3750), (0.4419, 0.2500), (0.2248, 0.1250).

8. The flat head "V"-shaped groove textured surface according to claim 7, wherein ​ ​ ​ ​ ​ ​ A rectangular coordinate system is established with the first feature point as the origin, and the longitudinal coordinate axis of the rectangular coordinate system is arranged along the vertical direction of the movement direction; the dimensionless coordinate values of the eighteen feature points in the rectangular coordinate system are respectively: (0, 0), (0.2500, 0), (0.5000, 0.1250), (0.7500, 0.2500), (1, 0.3750), (1, 0.5000), (1, 0.6250), (0.7500, 0.7500), (0.5000, 0.8750), (0.2500, 1), (0, 1), (0.2000, 0.8750), (0.4000, 0.7500), (0.6000, 0.6250), (0.8000, 0.5000), (0.6000, 0.3750), (0.4000, 0.2500), (0.2000, 0.1250).

9. The flat "V"-groove textured surface of claim 1, wherein, The depth of the groove texture is 5 μm ~20 μm; the area density of the groove texture is 20%~40%.

10. A friction pair, characterized in that The flat "V"-groove textured surface of any one of claims 1-9.

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