阅读说明：本技术 具有功能梯度仿生织构的轴瓦及制备方法、和水润滑轴承 (Bearing bush with function gradient bionic texture, preparation method and water-lubricated bearing ) 是由 李云凯 王优强 罗恒 菅光霄 于晓 于 2020-05-22 设计创作，主要内容包括：本发明公开了具有功能梯度仿生织构的轴瓦及制备方法、和水润滑轴承,所述轴瓦表面设有能够实现功能梯度化的仿生织构,所述仿生织构包括仿猪笼草唇部的径向脊形亲水性表面织构和蜡质区的月牙形疏水性表面织构。本发明实现轴瓦与轴上两滑动表面间的减摩,以及润滑剂由端部向中部的定向输运,从而改善内圈轴瓦中部区域的润滑状态。(The invention discloses a bearing bush with a function gradient bionic texture, a preparation method thereof and a water lubricated bearing. The invention realizes the antifriction between the two sliding surfaces on the bearing bush and the shaft and the directional transmission of the lubricant from the end part to the middle part, thereby improving the lubricating state of the middle area of the inner ring bearing bush.)

1. The bearing bush with the functional gradient bionic texture is characterized in that: the surface is provided with a bionic texture capable of realizing functional gradient, and the bionic texture comprises a radial ridge hydrophilic surface texture imitating the lip of pitcher plant and a crescent hydrophobic surface texture imitating the wax area.

2. The bearing bush with the functional gradient bionic texture as claimed in claim 1, wherein: the crescent hydrophobic surface textures are arranged at two end parts of the bearing bush, so that the directional transportation of the lubricant from the end parts to the middle part is realized; the radial ridge hydrophilic surface texture is arranged in the middle of the bearing bush.

3. The bearing bush with the functional gradient bionic texture as claimed in claim 2, wherein: the radial ridge hydrophilic surface texture is divided into two stages, and the arrangement form of the bionic texture is as follows: crescent, first radial ridge, second radial ridge, first radial ridge and crescent; the first stage is a double-layer radial ridge texture and is arranged on the outer side of the middle part of the bearing bush; the second level is a double-layer radial ridge composite texture with a wedge-shaped blind hole and is arranged in the center of the bearing bush.

4. The bearing bush with the functional gradient bionic texture as claimed in claim 3, wherein the bearing bush is characterized in that: the parameters of the crescent hydrophobic surface texture are set as follows: CC 1006; the parameters of the first-stage radial ridge hydrophilic surface texture are set as follows: DR 0102; the parameters of the second-stage double-layer radial ridge composite texture with the wedge-shaped blind holes are set as follows: CR 0202.

5. The bearing bush with the functional gradient bionic texture as claimed in claim 3, wherein the bearing bush is characterized in that: the hydrophilicity of the second-stage double-layer radial ridge composite texture with the wedge-shaped blind holes is better than that of the first-stage double-layer radial ridge texture.

6. The bearing bush with the functional gradient bionic texture as claimed in claim 3, wherein the bearing bush is characterized in that: and the second-stage matrix material of the double-layer radial ridge composite texture with the wedge-shaped blind holes is halogenated and modified UHMWPE.

7. The water lubricated bearing with the functional gradient bionic texture bearing bush is characterized in that: comprises an outer ring shaft sleeve, a rolling body, a retainer and an inner ring bearing bush from outside to inside; the inner ring bearing bush is the bearing bush with the functional gradient bionic texture, which is disclosed by any one of claims 1 to 6.

8. The preparation method of the bearing bush with the functional gradient bionic texture as claimed in any one of claims 3 to 6, is characterized by comprising the following steps:

(1) preparing a base material UHMWPE and carrying out surface treatment: obtaining a workpiece which is in a semi-circular shape and has a width of 1/5 bearing actual width;

(2) micro-nano processing of the bionic texture: processing surface textures with shape and size parameters meeting requirements on the inner curved surface of the workpiece, wherein the surface textures are respectively a crescent hydrophobic texture, a first-stage double-layer radial ridge hydrophilic texture and a second-stage double-layer radial ridge hydrophilic composite texture with a wedge-shaped blind hole;

(3) halogenation modification of a double-layer radial ridge hydrophilic composite texture base material with wedge-shaped blind holes: soaking the second-stage hydrophilic composite texture into a 15% potassium bromide solution for 30 hours;

(4) assembling and mounting inner ring bearing bushes: firstly, two identical semicircular workpieces are combined into a workpiece which is in the shape of a circular ring and has the width of 1/5 actual width of a bearing, then the workpiece is combined in the sequence of crescent, first-stage radial ridge, second-stage radial ridge, first-stage radial ridge and crescent to complete the whole bearing bush and is installed on the inner ring of the bearing, and the preparation of the bearing bush of the inner ring is completed.

9. The method for preparing the bearing bush with the functional gradient bionic texture as claimed in claim 8, wherein in the step (1), a small laboratory injection molding machine is used to heat, compress, plasticize, inject and cool the UHMWPE powder material to obtain a block-shaped UHMWPE workpiece, and the block-shaped UHMWPE workpiece is cut, ground and polished to obtain a semi-circular workpiece with the width of 1/5 bearing actual width.

Technical Field

The invention belongs to the technical field of tribology and surface engineering, relates to the structural design of a water-lubricated bearing, and particularly relates to a bearing bush with a functional gradient bionic texture, a preparation method of the bearing bush and the water-lubricated bearing.

Background

The water lubricated bearing is usually lubricated by water or a water-based lubricant, mainly comprises an outer ring shaft sleeve, a rolling body, a retainer and an inner ring bearing bush, wherein the inner ring bearing bush is mainly made of a non-metallic material, has the unique advantages of green and environmental protection, and is mainly applied to occasions such as stern bearings, water pumps, hydraulic turbine sets and the like of ships. The selection of the bearing bush material of the water lubricated bearing has important influence on the lubricating performance, the working reliability and the service life of the water lubricated bearing. In recent years, the selection of polymer or composite materials for bearing bush materials has become a hot point of research, and the modification or arrangement of surface textures of the bearing bush materials also gradually becomes an important means for improving the friction performance of the water-lubricated bearing. Among them, the UHMWPE material is widely used in the modification research of the bearing material of the water-lubricated bearing because of its advantages such as high impact strength, good wear resistance, and low friction coefficient.

The surface texture is considered as one of new methods for improving the surface tribological performance, and as a surface modification method, a plurality of regular pits, grooves, or micro-protrusions and other different shapes are processed on the surface of the friction pair so as to improve the tribological performance of the surface of the friction pair. As the surface interface of the biological friction system is subjected to complex working conditions for a long time or generates energy and material interaction with the surrounding environment, various types of forms, configurations, materials and structures are optimized, and a brand-new thought is provided for the research of friction problems in the artificial field, so that the bionic tribology is widely applied to the friction reducing and drag reducing research of surface textures. The surface morphology and wettability of two functional parts of the nepenthes for realizing the insect catching function are greatly different, the radial ridge surface structure of the lip has high hydrophilicity, the crescent surface structure of the waxy region has high hydrophobicity, and the two parts can show good antifriction performance.

The friction performance research of the halogenated modified lifting material can be firstly seen in the report of the rubber material. Among these, in the study of chlorinated modified SBR rubber, researchers used trichlorocyanic acid as a modifying agent, and considered that hydrophilicity of the rubber surface had a correlation with the kind of solvent dissolving trichlorocyanic acid, the modification time, the degree of reaction, and the like. In the reported research on halogenated modified UHMWPE materials, researchers prepare the surface of brominated UHMWPE by using a method of halogenation reaction of alkane under ultraviolet irradiation, so that the adhesion of nanoparticles on the surface of brominated UHMWPE is enhanced, and the wear resistance of the composite material is greatly improved. The research of improving the hydrophilicity of the UHMWPE material by modifying the UHMWPE material is also used for improving the mechanical property, the interface adhesion property, the self-cleaning property and the like when the UHMWPE material is used as a film or a coating material.

In conclusion, no relevant report exists in the past that the surface textures of the nepenthes lip and the waxy region are applied to the antifriction research of the bearing bush material of the water-lubricated bearing; there is also rarely a study on modifying UHMWPE materials by halogenation to simultaneously achieve hydrophilicity enhancement and surface morphology improvement, thereby synergistically optimizing tribological properties. Therefore, the invention designs the texture of the surface of the bearing bush aiming at the defects of the two points and provides a reasonable technical scheme and a test basis for verifying the reasonability and the feasibility of the bearing bush.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a bearing bush with a functional gradient bionic texture, a preparation method and a water-lubricated bearing, so that the friction reduction between two sliding surfaces on the bearing bush and a shaft is realized, and the directional transportation of a lubricant from an end part to the middle part is realized, thereby improving the lubrication state of the middle area of the bearing bush of an inner ring.

In order to solve the technical problems, the invention adopts the technical scheme that:

firstly, the invention provides a bearing bush with a function gradient bionic texture, wherein the surface of the bearing bush is provided with the bionic texture capable of realizing function gradient, and the bionic texture comprises a radial ridge hydrophilic surface texture imitating the lip of pitcher plant and a crescent hydrophobic surface texture in a waxy region.

Furthermore, the crescent hydrophobic surface textures are arranged at two end parts of the bearing bush, so that the directional transportation of the lubricant from the end parts to the middle part is realized; the radial ridge hydrophilic surface texture is arranged in the middle of the bearing bush.

Further, the radial ridge hydrophilic surface texture is divided into two stages, and the arrangement form of the bionic texture is as follows: crescent, first radial ridge, second radial ridge, first radial ridge and crescent; the first stage is a double-layer radial ridge texture and is arranged on the outer side of the middle part of the bearing bush; the second level is a double-layer radial ridge composite texture with a wedge-shaped blind hole and is arranged in the center of the bearing bush.

Further, the parameters of the crescent hydrophobic surface texture are set as follows: CC 1006; the parameters of the first-stage radial ridge hydrophilic surface texture are set as follows: DR 0102; the parameters of the second-stage double-layer radial ridge composite texture with the wedge-shaped blind holes are set as follows: CR 0202.

Furthermore, the hydrophilicity of the second-stage double-layer radial ridge composite texture with the wedge-shaped blind holes is better than that of the first-stage double-layer radial ridge texture.

Further, the second-stage base material with the double-layer radial ridge composite texture with the wedge-shaped blind holes is halogenated and modified UHMWPE.

The invention further provides a water-lubricated bearing with the functional gradient bionic texture bearing bush, the bearing has the same structure as a traditional sliding bearing, and comprises an outer ring shaft sleeve, a rolling body, a retainer and an inner ring bearing bush from outside to inside; the bearing bush of the inner ring is the bearing bush with the functional gradient bionic texture.

Finally, the invention also provides a preparation method of the bearing bush with the functional gradient bionic texture, which comprises the following steps:

(1) preparing a base material UHMWPE and carrying out surface treatment: obtaining a workpiece which is in a semi-circular shape and has a width of 1/5 bearing actual width;

(2) micro-nano processing of the bionic texture: processing surface textures with shape and size parameters meeting requirements on the inner curved surface of the workpiece, wherein the surface textures are respectively a crescent hydrophobic texture, a first-stage double-layer radial ridge hydrophilic texture and a second-stage double-layer radial ridge hydrophilic composite texture with a wedge-shaped blind hole;

(3) halogenation modification of a double-layer radial ridge hydrophilic composite texture base material with wedge-shaped blind holes: soaking the second-stage hydrophilic composite texture into a 15% potassium bromide solution for 30 hours;

(4) assembling and mounting inner ring bearing bushes: firstly, two identical semicircular workpieces are combined into a workpiece which is in the shape of a circular ring and has the width of 1/5 actual width of a bearing, then the workpiece is combined in the sequence of crescent, first-stage radial ridge, second-stage radial ridge, first-stage radial ridge and crescent to complete the whole bearing bush and is installed on the inner ring of the bearing, and the preparation of the bearing bush of the inner ring is completed.

Further, in the step (1), a small injection molding machine for a laboratory is used, UHMWPE powder materials are subjected to heating, compressing, plasticizing, injecting and cooling steps to obtain blocky UHMWPE workpieces, and then the blocky UHMWPE workpieces are subjected to cutting, polishing and polishing steps to obtain the workpieces which are semicircular and annular and have the width of 1/5 actual bearing width.

At present, no case for realizing the antifriction between two sliding surfaces on a bearing bush and a shaft and improving the lubricating state of the middle area of an inner ring bearing bush by using the similar bearing is prepared and used in China, and compared with the prior art, the invention has the advantages that:

1. the surface textures of the nepenthes lip and the waxy region are applied to the antifriction research of the water-lubricated bearing bush material, and a bearing bush with a functional gradient bionic texture surface and a preparation method thereof are provided;

2. on the basis of the original crescent hydrophobic texture and radial ridge hydrophilic texture, the optimized designs of a double-layer crescent hydrophobic composite texture, a crescent hydrophobic composite texture with bionic wax crystal, a double-layer radial ridge hydrophilic composite texture with a wedge-shaped blind hole and the like are provided, and the optimal texture shape and size parameters are obtained through tests and combined to form the bearing bush with the function gradient bionic texture surface;

3. the novel chemical modification method of the halogenated modified UHMWPE is provided for further improving the hydrophilicity of the UHMWPE base material of the double-layer radial ridge hydrophilic composite texture with the wedge-shaped blind hole, and a test is carried out for exploring the relationship between the hydrophilicity and the tribological performance of the UHMWPE modified by the method;

4. the bearing bush material is comprehensively improved in wettability and surface appearance through halogenation modification and surface texture arrangement, so that the friction and lubrication performance of the bearing bush material are synergistically optimized, and a reasonable design scheme and a test basis are provided for antifriction application research of the bionic surface texture on the modified water-lubricated bearing bush material.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1a is a schematic view of the entire structure of a water lubricated bearing according to embodiment 2;

FIG. 1b is a perspective view of a water-lubricated bearing according to embodiment 2;

FIG. 2a is a schematic view of a functionally graded biomimetic textured surface of example 1;

FIG. 2b is an enlarged schematic view of the crescent-shaped hydrophobic surface texture of example 1;

FIG. 2c is a schematic three-dimensional enlarged view of the crescent-shaped hydrophobic surface texture of example 1;

FIG. 2d is an enlarged schematic view of the double-layer radial ridge hydrophilic surface texture of example 1;

FIG. 2e is a schematic three-dimensional enlarged view of the double-layer radial ridge hydrophilic surface texture of example 1;

FIG. 2f is an enlarged schematic view of the double-layer radial ridge composite texture with the wedge-shaped blind holes of example 1;

fig. 2g is a three-dimensional enlarged schematic view of the double-layer radial ridge composite texture with the wedge-shaped blind holes of example 1.

In the figure, 1-an outer ring shaft sleeve, 2-a rolling body, 3-a retainer, 4-an inner ring bearing bush, 5-a bearing bush end part, 6-a bearing bush middle part, 7-a bearing bush center, 8-a crescent hydrophobic surface texture, 9-a first-stage double-layer radial ridge texture, and 10-a second-stage double-layer radial ridge composite texture with wedge-shaped blind holes.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.