激光表面织构对过盈配合界面微动损伤的影响  

Effect of Laser Surface Texturing on Fretting Damage of Interference Fit Interface

作　　者：殷超超 黄海鸿[1,2] 周丹[1,2] 刘志峰[1,2] YIN Chaochao;HUANG Haihong;ZHOU Dan;LIU Zhifeng(Key Laboratory of Green Design and Manufacturing of Mechanical Industry,Hefei University of Technology,Anhui Hefei 230009,China;School of Mechanical Engineering,Hefei University of Technology,Anhui Hefei 230009,China)

机构地区：[1]合肥工业大学机械工业绿色设计与制造重点实验室,安徽合肥230009 [2]合肥工业大学机械工程学院,安徽合肥230009

出　　处：《摩擦学学报》2023年第12期1478-1485,共8页Tribology

基　　金：国家自然科学基金项目(U20A20295,51722502)资助。

摘　　要：采用自主研制的过盈配合微动试验装置,研究了激光表面织构对过盈配合界面在服役过程中微动损伤特性的影响.以列车转向架为研究对象,采用激光打标机对空心轴外表面进行织构化处理,通过WPA-20型试验机对织构化试样进行微动损伤试验,研究了不同载荷频次下过盈配合界面微动损伤的演变特性.试验结果表明:激光表面织构增强了空心轴外表面的表面强度,显著减小了空心轴外表面服役过程中的微动损伤.分别从微观结构、残余应力和电子功函数三方面对试验结果进行分析,经过织构化处理后,试样表层材料的细晶强化和位错强化有效地提高了轴过盈配合表面强度;试样表面的残余压应力延缓了轴过盈配合表面微动损伤的扩展;同时,试样表面的电子功函数增加了4.4%,提高了表面材料的抗剥离性.The influence of laser surface texturing on fretting damage of interference fit interface in service was studied by using the self-developed interference fit simulation experimental device.The train bogie was taken as the research object.The fretting experiment of interference fit interface was simplified by using the sleeve and hollow shaft.The outside surface of hollow shaft sample was textured by HGTECH LSF20D laser marking machine.The surface texture pattern is elliptical and has a surface density of 25%.The length ratio of the major axis to the minor axis of the ellipse is set to 0.618.The elliptical area is equal to that of the circle with a diameter of 100μm.In order to ensure the consistent working conditions,the circumferential surface of the hollow shaft was divided into two equal regions in the axial direction.One half of the region was textured and the other half was kept in the original state.The fretting damage test was carried out through the WPA-20 testing machine.According to the actual working condition of the train bogie,the low cycle loading was adopted.The load frequency was set to 5 Hz,the load pressure was 5 kN,and the load amplitude was 1 mm.The evolution characteristics of fretting damage of interference fit interface under different load frequencies were studied,and the load frequencies were selected as 30000 cycles,50000 cycles,and 70000 cycles,respectively.After the fretting damage test of each stage is completed,the specimens were cut by wire cutting,and the damage evolution of the textured area and the untextured area of the mating surface was analyzed by the laser measuring microscope(VKX250,KEYENCE,Japan).The experimental results showed that the laser surface texturing enhanced surface strength and wear resistance of the interference fit interface,significantly reduced the fretting damage of the interference fit interface during service.The experimental results were analyzed from the microstructure,residual stress and electron work function.After laser surface texturing,the surfac

关 键 词：激光表面织构 微动损伤 细晶强化 残余应力 电子功函数 

分 类 号：TH117.1[机械工程—机械设计及理论]