多股螺旋弹簧扭动微动磨损机理研究  

Torsional Fretting Wear of Stranded-Wire Helical Spring

作　　者：王时龙[1] 雷松[1] 蔡振兵[2] 李小勇[1] 周杰[1,2] 朱旻昊[2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]西南交通大学牵引力国家重点实验室摩擦学研究所,四川成都610031

出　　处：《摩擦学学报》2011年第4期388-396,共9页Tribology

基　　金：国家杰出青年科学基金项目(50925518);国家自然科学基金项目(50775226);教育部科学技术研究重点项目(109129);重庆市科技攻关计划项目(CSTC2009AC3049);重庆大学研究生科技创新基金资助项目(200911A1A0020318)、重庆大学“211工程”三期创新人才培养计划建设项目(S-09106)资助~~

摘　　要：基于多股螺旋弹簧工作过程中钢丝表面发生的扭动微动磨损,建立了多股簧受冲击载荷时,各股钢丝间法向接触力及角位移值的数学模型;通过数学模型所得到的试验参数,在新型试验装置上真实模拟了多股簧工作过程中钢丝间发生的柱-柱接触扭动微动;研究了多股簧钢丝在扭动微动条件下的运行行为和损伤机理.结果表明:钢丝间法向接触力大小、角位移幅值及循环次数对扭动微动行为影响很大;扭动微动T-θ曲线在平行四边形状、椭圆状和直线状3种基本类型之间转变;损伤在部分滑移区较轻微,其磨损主要表现为磨粒磨损和轻微氧化磨损;对于混合区和滑移区,损伤加剧,磨痕表面有明显的塑性变形,损伤机制主要为磨粒磨损、氧化磨损和剥层.The wear on the local area of the steel wires′ surface is due to the torsional fretting in the working process of the stranded-wire helical spring.Two mathematical models to calculate the normal contact force among the wires and the angular displacement respectively were established at first when the stranded spring was subject to impact load.With the experimental parameters obtained from the models,the torsional fretting test using a cylinder-cylinder contact mode,which authentically stimulated the torsional fretting among the wires in the working process of the spring,was realized successfully on a newly developed fretting tester.The running behavior and the failure mechanism of the spring wires under the torsional fretting conditions were systematically researched.It is learned that the behavior of torsional fretting strongly depended upon the normal contact force,the angular displacement amplitude and the cycles.There are three basic types of T-θ curves during the process of torsional fretting,i e.parallelogram,elliptical and linear T-θ curves.In the partial slip regime,the damage was mild and its main characteristic was abrasive wear and the mild oxidative wear,whereas the wear mechanisms were abrasive wear,oxidative wear and the delamination accompanied by the obvious plastic deformation in the mixed fretting and slip regimes.

关 键 词：多股螺旋弹簧 扭动微动 运行行为 损伤机理 

分 类 号：TH135.1[机械工程—机械制造及自动化] TH117.3