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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.
Based on the twisting fretting wear of the wire surface during the operation of the multi-strand coil spring, the mathematical model of the normal contact force and the angular displacement value of each strand when the spring load is under impact load is established. The mathematical model The parameters of the experiment were simulated on a new type of test rig. The behavior of column-column contact twisting and fretting occurred between the wires in the process of multi-strand reeling. The running behavior and damage mechanism of multi-strand spire wire under twisting and fretting conditions were studied. The results show that the magnitude of normal contact force, the amplitude of angular displacement and the number of cycles have a great influence on the twisting fretting behavior. The twisting fretting T-θ curve has great influence on the three basic types of parallelogram, ellipse and straight line The damage is slight in the partial slip zone, and the wear is mainly abrasive wear and slight oxidation wear. For the mixed zone and the slip zone, the damage aggravates and the surface of the wear mark has obvious plastic deformation. The main damage mechanism is Abrasive wear, oxidative wear and delamination.