转向架关键部件螺纹连接界面微动磨损行为研究
吴向阳1,2，张志毅1,3，田仁勇1，李亚南1，胡华民1，刘建华*,1
（1.中车青岛四方机车车辆股份有限公司，山东 青岛 266111；2.山东大学 材料科学与工程学院，山东 济南 250100；3.西南交通大学 摩擦学研究所，四川 成都 610031）
摘要：螺纹连接的可靠性对机车车辆的安全运行至关重要，而界面的微动行为（微动磨损和微观滑移）是螺纹连接失效的重要原因之一。首先选取某高速列车转向架关键部件螺纹连接材料制成直径为10 mm的球试样和10×10×20 mm的平面试验，然后进行球/平面模型的切向微动磨损试验，考察法向载荷、位移幅值和循环次数对材料损伤的影响规律，最后利用扫描电子显微镜和三维白光干涉形貌仪对平面试验进行损伤形貌分，揭示其磨损机制。试验结果表明：随着法向载荷的增加，界面摩擦系数减小，磨损程度减轻；随着位移幅值的增加，界面摩擦系数增大，磨损加剧；随着循环次数的增加，磨损宽度和深度增大，磨损越为严重；表面主要的磨损机制为疲劳磨损和磨粒磨损。
关键词：螺纹连接；微动磨损；摩擦系数；微观形貌
中图分类号：TH117.1 文献标志码：A doi：10.3969/j.issn.1006-0316.2020.04.007
文章编号：1006－0316 (2020) 04－0039－05
Fretting Wear Behaviour of the Interface of Bogies’ Key Bolted Joints
WU Xiangyang1,2，ZHANG Zhiyi1,3，TIAN Renyong1，LI Ya’nan1，HU Huamin1，LIU Jianhua1
( 1.CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China; 2.School of Materials Science & Engineering, Shandong University, Ji'nan 250100, China; 3.Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China )
Abstract：The reliability of bolted joints is very important for the safe operation of locomotives and vehicles. A leading cause of the failure of fastener joints is fretting behaviour (fretting wear and micro-slip) of the interface. This paper analyses the fretting wear behavior of the bolted joints on the key components of a high-speed train bogie. Tangential fretting wear tests were performed with both plane model and spherical model. The effects of normal load, displacement amplitude and loading cycles on the damage of the material were being investigated. The results show that the coefficient of friction and the degree of fretting wear decreases with the increasing normal loading, and intensifies while displacement amplitude increases. With the increase of the loading cycles, width and depth of the damaged area increase, and more serious damage occurs. The main wear mechanisms are fatigue wear and abrasive wear.
Key words：bolted joint；fretting wear；friction coefficient；micro-morphology
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收稿日期：2019－08－26
基金项目：国家自然科学基金青年基金（51705434）；四川省重点研发项目（2019YFG0290）
作者简介：吴向阳（1983－），男，江苏连云港人，硕士，主要研究方向为转向架焊接自动化与工艺仿真。*通讯作者：刘建华（1987－），男，四川成都人，博士，主要研究方向为机械连接设计，jianhua-liu@swjtu.edu.cn。
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