激光表面织构对铸铁摩擦磨损性能的影响

Effect of Laser Surface Texturing on Frictional and Wear Performance of Cast Iron

目的找出最佳的表面织构方案,将其应用在摩擦副的表面处理上,从而达到降摩减阻、节能减排的目的。方法设计了两种不同的加工面积占有率(10%和20%),三种不同形状的表面织构(圆坑、椭圆坑、沟槽),对铸铁试件进行激光表面加工,并利用环-块磨损试验机进行油润滑摩擦磨损实验。结果表面织构对铸铁材料的摩擦磨损性能有明显改善,尤其在磨损量方面。三种不同形状的表面织构相比,圆形表面织构试件的磨损量最小。两种不同面积占有率相比,面积占有率为20%的圆形微织构试件的磨损量最小,并在一定程度上减小了摩擦系数。结论在本实验研究条件下,面积占有率为20%的圆形表面织构对改善铸铁材料的摩擦磨损性能最显著。

Objective To find out the best design of surface texture and apply it to the surface treatment of friction pair for the purpose of wear resistance and friction reduction, energy conservation and emission reduction. Methods Two kinds of area ratio （10% and 20%） and three different designs of surface texture （circular, elliptical and groove） were designed and manufac- tured on cast iron specimens by means of laser surface texturing technique. The friction and wear performance of the textured specimens was tested using the high-speed ring-block wear testing machine with oil lubrication. Results Experimental results showed that the surface texture had significant effect on the tribological properties of cast iron, especially in wear rate. Within the three different surface micro textures, the circular dimples on the surface of specimens had the best performance on wear reduction, and the 20% textured surface with circular dimples had smaller wear rate and coefficient of friction than that of 10% textured surface. Conclusion Under the operating condition of this experimental study, 20% textured surface with circular dimples has the most significant improvement on the friction and wear properties of cast iron.