Preparation And Antifriction Properties Of Shark Skin Texture

With the rapid development of economy,high efficiency and energy saving in production have become particularly important.The common problems of friction,wear and lubrication in mechanical equipment have attracted much attention.The results show that the surface of biomimetic texture has good effect in reducing friction,reducing wear,improving lubrication and reducing fluid resistance.Therefore,the surface of biomimetic texture has been paid much attention to and is well applied in ships and airplanes.At the same time,in a subtle way,the gradual impact on the machinery industry.On the basis of the real structure of shark skin surface,this paper constructs a groove model with the same rule.The influence of different load,different texture angle and different lubrication conditions on the friction and wear properties of the shark skin texture on the material surface was obtained through experimental method.The mechanism of antifriction is also analyzed,which provides a basis for the application of biomimetic texture in machinery.This article from the antifriction mechanism of shark skin riblet,first of all,the riblet structure placoid scales,the antifriction mechanism of riblet in fluid and analysis.Secondly,according to the real shield scale structure of the shark skin,the prototype was simplified and reconstructed,and the model of the shark skin convex groove was established.the original size width of 60 ?m and 1 ?m high(hereafter called micron texture),amplified 40 times(called texture mm level),on the 45 surface processing of steel material the use of imitation shark skin groove machining--traditional CNC engraving and milling machine.After the experiment,the friction reducing performance of the MM-P2 friction and wear tester is studied on the surface contact of the friction and wear test machine,and the experimental conclusion is obtained:(1)200N load,boundary lubrication,The average value of the friction coefficient between the texture surface and the untextured surface at the 90 degree texture is 0.9021 and 0.997,respectively.The average friction coefficient of the textured surface decreases by 9.52% compared with the untextured surface.The average value of the friction coefficient of the 0 degree texture angle is 0.824.The average friction coefficient of the textured surface decreases by 17.35% compared with the untextured surface.However,when the texture angle is 0 degrees,the variation of the friction coefficient is larger.(2)200N load,mixed lubrication,the average friction coefficient of surface texture 90 degree angle and surface texture without texture of both were 0.8052 and 0.9053.The average friction coefficient of the textured surface decreases by 11.06% compared with the untextured surface;and the average friction coefficient of the 0 degree texture angle is 0.8007.The average friction coefficient of the textured surface decreases by 11.55% compared with the untextured surface.However,when the texture angle is 0 degrees,the variation of the friction coefficient is larger.(3)mixed lubrication,90 degree texture angle surface texture,the average friction coefficient in 100 N and 300 N loads were 1.2828 and 0.5687,compared with uncoated surface texture under the same experimental conditions were reduced by 16.62% and 4.8%,have a certain friction reduction effect.And with the increasing of load,reduce the average friction coefficient of material surface.Finally,according to the similarity theory,the similarity rule of the bionic texture surface in the friction and wear experiment under mixed lubrication conditions is deduced by dimensional analysis,and the corresponding dimensionless criterion relation is simplified.The texture surface is popularized in friction and wear.