CN102714949A - Bamboo-like wear-resistant surface - Google Patents

Abstract

The invention discloses a bamboo imitation wear-resistant surface. The invention is a columnar bionic protruding structure imitating bamboo section fibers. There is a hemispherical pit in the center of the bionic protruding structure, and the pit radius is r, 1mm≤r≤5mm. The outer contour of the raised structure satisfies the following mathematical expression:

Among them, x and y represent the x-axis and y-axis in the two-dimensional coordinate system; R is the radius of the outer contour, r≤R≤5r, and the center of the outer contour is located at the edge of the hemispherical pit in the center of the bionic protrusion. The protrusion height is H, and H<5mm; the adjacent bionic protrusion structures are arranged in a rhombus; the invention has good wear resistance and desorption performance.

Description

A kind of imitation bamboo wear-resisting surface

technical field

The invention relates to a bamboo imitation wear-resistant surface, more specifically, the invention relates to a bionic wear-resistant surface used for improving the wear resistance and service life of the soil-contacting parts of agricultural machinery.

Background technique

With the rapid development of agricultural mechanization, the farming speed has been greatly increased, and the farming environment has become more and more complex, which puts forward higher and higher requirements for the performance of farming tools, especially the performance of soil-touching farming components. The main failure mode of soil-contacting parts of agricultural machinery is wear failure during the farming process. Therefore, the wear resistance of soil-contacting parts of agricultural machinery can be improved, thereby prolonging the service life of parts and reducing the cost of frequent replacement of parts. An important topic in the field of component research.

There are patent reports at home and abroad in terms of improving the wear resistance of soil-contacting parts, reducing production costs and tillage resistance, etc. At present, the patent achievements are mainly concentrated in two aspects: the application of new materials and the application of bionic technology. The use of wear-resistant materials to produce agricultural machinery soil-touching parts, and the use of new processing technologies to treat agricultural machinery soil-touching parts can significantly improve the wear resistance and service life of the parts:

1. The Chinese patent application number is: 01133458.4, the announcement date is 2005.01.26, and the title of the invention is "Bionic non-smooth and wear-resistant composite coating and its preparation method", which discloses a non-smooth and wear-resistant composite coating with multi-component copper-based brazing The material is used as a bonding alloy, and the enhanced wear-resistant hard point particles are connected with the base steel to form a non-smooth wear-resistant composite coating on the surface of the base steel. The composition of the multi-component copper-based solder is: zinc, manganese, nickel, tin , silicon, rare earth, and the balance of copper; the composition of the brazing flux is: a mixture of boric acid and borax, and a small amount of fluoride is added; the composition of the enhanced wear-resistant hard point particles is carbide, the particle size is 50-100 mesh, and the total amount is added In: 20~80Wt%. The preparation method of the non-smooth and wear-resistant composite coating: after the multi-component copper-based solder is prepared and smelted according to the above components, it is made into a powder with a particle size of 20-80 mesh, and the mass percentage is: 30-70% and 20-80% One, two or three of tungsten carbide, titanium carbide, silicon carbide and flux 1 to 3 are uniformly mixed, and after heating the multi-element copper-based brazing filler metal and the brazing flux are melted, the multi-element copper-based brazing filler metal will hard point Brazing forms a non-smooth and wear-resistant composite coating on the surface of the base carbon steel. To improve the wear resistance of unearthed mechanical parts.

2. Chinese patent, date of announcement is 1994.01.26, application number: 91106940.2, the title of the invention is "high-life excavation component wear-resistant material and its manufacturing method", which discloses a wear-resistant material, which is used in agriculture, mining, national defense, etc. For the processing of mining components in construction machinery, general steel is used as the base material, and a transition layer and a wear-resistant layer are spray-welded on the surface. The transition layer contains Cr, B, Si, and Ni components, and the wear-resistant layer is WC and bonding. Metal melt, in which the WC content is 50-70%, and the bonding metal contains Cr, B, Si, Cu, Ni components.

Bionics research shows that after hundreds of millions of years of evolution, animals and plants have already had the structure and function to adapt to different environments. In the field of agricultural machinery, inspired by the characteristics of soil animals, the analysis of digging organs and digging actions of soil animals uses simulation Based on the morphological characteristics and biological characteristics of typical soil animals, the bionic agricultural machinery soil-contacting parts developed have achieved obvious effects in reducing drag and wear:

1. The application number is: 201010166033.5, the announcement date is 2010.09.22, and the title of the invention is "a conical soil-contacting part with a wear-resistant geometric surface", which discloses a conical soil-contacting part with a wear-resistant geometric surface , the component is composed of a base body and bionic geometric structure units distributed on the surface of the base body, the bionic geometric structure units include convex hull type, pit type, annular convex rib type, annular concave rib type, spiral convex hull type, spiral pit type, spiral convex rib type and spiral concave rib type.

2. The application number is: 200810050347.1, the announcement date is 2010.03.17, and the invention name is "ribbed bionic wear-resistant structure surface" which discloses a bionic wear-resistant structure surface, especially a kind of ribbed bionic wear-resistant geometry structured surface. The invention is based on the fact that the scale surface of the pangolin, a soil cave animal, has a geometric structure characteristic of being resistant to soil abrasive wear, and the purpose is to solve the existing wear problem of parts in contact with bulk materials. The surface of the bionic wear-resistant structure changes the structure of the surface of the original equipment or component and the contact material, and adds a series of ribbed structures with certain geometric parameters and spacing on the surface. The shape of the bionic wear-resistant structure is: y=asin(bx+c). Among them, a-amplitude, b-frequency, c-initial phase, 0<a≤12mm, 0≤bx-c≤π, 0≤x≤20mm. Rib spacing: 0<L<30mm.

3. The application number is: 201010166033.5, the announcement date is December 16, 2009, and the title of the invention is "Shovel surface of bionic drag-reducing ridging device and its design method". Creation describes a shovel surface of a bionic drag reduction ridger, which is characterized in that the shovel surface has y=-0.0l48x ² +0.86563x-1.51 as the ridge line, y=-0.0054Z ² +30.49 as the prime line, and the prime line A surface formed by lines along ridges.

Comparing the reported patents, we can see that there have been patent reports on improving the wear resistance and service life of agricultural machinery soil-contacting parts through the application of new materials and new processing technologies, and there are also patent reports developed by analyzing and simulating the morphological and biological characteristics of soil animals The patent application of the bionic wear-resistant structure or the bionic wear-resistant surface used for soil-touching tillage parts of agricultural machinery is published. However, the bionic wear-resistant structure designed by analyzing and simulating the plant structure has not yet been disclosed.

Bamboo has both a hollow structure and a fiber-reinforced structure, and has good mechanical properties. In addition, experimental studies have shown that bamboo has good wear resistance and desorption properties. The invention designs a bamboo imitation wear-resistant surface through the analysis and research of the bamboo microstructure, which is used to improve the wear resistance and service life of the soil-contacting parts of agricultural machinery.

Contents of the invention

The purpose of the present invention is to provide a bamboo-like wear-resistant surface in order to improve the wear resistance and service life of the soil-touching tillage parts of agricultural machinery and reduce the cost caused by frequent replacement of the tillage parts.

Bamboo has both a hollow structure and a fiber-reinforced structure, and has good mechanical properties. In addition, experimental studies have shown that bamboo has good wear resistance and desorption properties. The invention provides a bamboo imitation wear-resistant surface through the analysis and research of the bamboo microstructure, which is used to improve the wear resistance and service life of the soil-contacting parts of agricultural machinery. The wear-resistant bionic surface of imitation bamboo is composed of protrusions on the wear-resistant bionic surface of a cross-section structure imitating bamboo fibers and a specific arrangement of the bionic protrusions.

The invention designs a bamboo-imitation wear-resistant bionic surface for the soil-contacting parts of agricultural machinery. Through the analysis of bamboo fiber microstructure, arrangement, wear resistance and desorption mechanism, a wear-resistant biomimetic protrusion imitating the cross-sectional shape of bamboo fiber was designed. Raised arrangement.

The present invention is a columnar bionic protruding structure imitating bamboo cross-section fibers. There is a hemispherical pit in the center of the bionic protruding structure, and the radius of the pit is r, and 1mm≤r≤5mm.

Among them, x and y are the x-axis and y-axis in the two-dimensional coordinate system.

Where R is the radius of the outer contour, r≤R≤5r, the center of the outer contour is located at the edge of the hemispherical pit in the structural center of the bionic protrusion, and the height of the bionic protrusion is H, H<5mm;

The arrangement of the wear-resistant bionic raised structures is as follows: adjacent bionic raised structures are arranged in a rhombus, the smaller included angle in the rhombus arrangement is θ, 30o<θ<60o, and the distance between adjacent bionic raised structures is L, the spacing L of the bionic raised structures and the height H of the bionic raised structures satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; <</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 20</span>}$

The longer diagonal in the rhombus arrangement coincides with the sliding direction.

The above-mentioned wear-resistant biomimetic protrusion structure and the arrangement method of the biomimetic protrusion structure jointly constitute a bamboo-imitation wear-resistant surface according to the present invention.

The beneficial effect of the present invention compared with prior art is:

The wear-resistant surface of bamboo imitation described in the present invention is aimed at the wear problem of the working parts of agricultural machinery touching the soil. By imitating the structure and arrangement of bamboo fibers, an imitation surface with good wear resistance and desorption performance is formed. Bamboo wear-resistant surface. Experimental results show that, compared with similar smooth surface parts, the resistance in the operation process does not increase significantly, and the wear resistance increases by an average of 4% to 7%. Ability to attach significantly increased.

Description of drawings

Figure 1 is a photomicrograph of the worn surface of bamboo cross section.

Fig. 2 and Fig. 3 are schematic diagrams of the biomimetic protrusion structure of the present invention. Among them, FIG. 2 is a plan view, and FIG. 3 is a front view.

Fig. 4 is a schematic diagram of the arrangement of the biomimetic protrusion structures of the present invention.

Figure 5, Figure 6 and Figure 7 are schematic diagrams of the invention applied to a ditch opener. Wherein Fig. 5 is a front view, Fig. 6 is a left side view, and Fig. 7 is a top view.

Detailed ways

The invention designs a bamboo-imitation bionic wear-resistant surface according to the wear-resistant characteristics and structural characteristics of bamboo. Bamboo has good mechanical properties, thanks to the hollow structure and fiber-reinforced structure of bamboo. At the same time, studying the surface, the fiber-reinforced structure of bamboo makes bamboo have good wear resistance and desorption properties, so this structure is suitable for application In the field of bionic wear-resistant surface design of soil-contacting parts of agricultural machinery. The analysis of the fiber structure of the bamboo wear surface found that the bamboo fibers that play an important role in the wear resistance are in a regular symmetrical shape with a pit structure in the center, and the bamboo fibers are distributed in a diamond shape in the bamboo, as shown in Figure 1. At the same time, experiments show that the pit structure in the center of bamboo fiber can significantly reduce the adhesion of the soil during the wear process of bamboo and soil, and improve the desorption performance of bamboo.

The present invention combines the microscopic structure of bamboo fiber and the distribution mode of bamboo fiber in bamboo to design the imitation bamboo wear-resistant surface for the surface of the soil-contacting parts of agricultural machinery, including the bionic raised structure of the imitated bamboo fiber structure and the arrangement of the bionic raised structure method. The present invention designs a wear-resistant bionic protruding structure imitating the cross-sectional shape of bamboo fiber. The bionic protruding structure is a columnar bionic protruding structure imitating bamboo cross-section fibers. The bionic protruding structure 1 has a hemispherical pit 2 in the center The radius is r, 1mm≤r≤5mm, and the outer contour of the bionic raised structure 1 satisfies the following mathematical expression:

Among them, x and y are the x-axis and y-axis in the two-dimensional coordinate system.

Where R is the radius of the outer contour, r≤R≤5r, the center of the outer contour is located at the edge of the hemispherical pit 2 in the center of the bionic raised structure 1, and the height of the bionic raised structure 1 is H, where H<5mm. As shown in Fig. 2 and Fig. 3; the present invention has also designed the arrangement mode of wear-resistant biomimetic raised structure 1 according to the distribution mode of bamboo fiber in bamboo: adjacent bionic raised structures 1 are arranged according to the rhombus mode, and in the rhombus arrangement, relatively The small included angle is θ, 30o<θ<60o, the distance between adjacent bionic raised structures 1 is L, and the distance L between 1 bionic raised structures and the raised height H satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; <</span>\frac{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 20</span>}$

The longer diagonal line in the rhombus arrangement is consistent with the sliding direction, as shown in Figure 4; the above-mentioned wear-resistant bionic raised structure 1 and the arrangement method of the bionic raised structure 1 together form a kind of imitation bamboo resistant Grind the surface.

As shown in Fig. 5, Fig. 6 and Fig. 7, the ditch opener 3 is a commonly used soil-touching plowing part, which is often used in sowing and intertillage. Because the ditch opener 3 has a deep penetration into the soil, the resistance received during work is relatively large; plowing When contacting the soil, the hardness is relatively large, and the wear of the components is relatively serious. Apply the bamboo-like bionic wear-resistant surface of the present invention to the ditch opener 3 . The ditch opener 3 is produced by casting, and the surface of the ditch opener has a wear-resistant bionic raised structure 1, where r=1.5mm, R=4mm, and the height of the bionic raised structure H=2mm; the bionic raised structure 1 is shown in Figure 4. Arrangement according to the shown arrangement method, in which the smaller included angle in the rhombus arrangement is 30o, the distance between the centers of adjacent bionic raised structures is 20mm, and the longer diagonal line in the rhombus arrangement is parallel to the soil movement direction during the tillage process.

Claims (2)

1. imitative bamboo wearing face is characterized in that: it is the bionical bulge-structure of column of imitative bamboo cross-section fibers, and there is hemispherical pit at bionical bulge-structure center, and the pit radius is r, 1mm≤r≤5mm, and the outline of bionical bulge-structure satisfies following mathematic(al) representation:

X wherein and y are x axle and the y axle in the two-dimensional coordinate system;

Wherein R is the profile radius, and r≤R≤5r, outer contour are centered close to the hemispherical pit edge of the structure heart in the bionical convexity, and bionical protruding height is H, H < 5mm;

Said adjacent bionical bulge-structure is arranged according to the rhombus mode.

2. a kind of imitative bamboo wearing face according to claim 1; It is characterized in that: less angle angle is θ in the described diamond array; 30o θ 60o, distance is L between adjacent bionical bulge-structure, relation below bionical bulge-structure spacing L and bionical bulge-structure height H satisfy:

$10<\frac{L}{H}<20$

Diagonal long in the diamond array is consistent with glide direction.

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