载荷和纳米MoS2添加剂含量对圆形锤头-棒料的摩擦磨损特性及其机理分析

针对精密下料中圆形锤头与棒料之间弧状接触面剧烈的摩擦磨损问题，借助WTM-2E型可控气氛摩擦磨损试验仪，利用GCr15钢块-45钢柱摩擦副在纳米MoS2添加剂质量分数为0%、0.1%、0.2%、0.3%、0.4%、0.5%和0.7%等七种润滑工况下，重点对不同载荷下摩擦磨损试验进行分析；采用扫描电子显微镜观察了GCr15钢块磨损表面形貌，采用能量色散谱仪(EDS)分析了GCr15钢块磨损表面成分，并探讨了其润滑抗磨及自修复机理. 结果表明：随着载荷增加，摩擦接触应力变大，摩擦系数和磨损量呈上升趋势，磨损表面形态由轻微磨粒磨损转变为黏着磨损. 同时加入的MoS2添加剂的质量分数并非越高越好，摩擦系数和磨损量随MoS2添加剂质量分数的升高呈现先减小后增大趋势，且MoS2添加剂质量分数在0.1%~0.3%范围内时减摩抗磨效果较好. 通过对比不同润滑条件下摩擦副因摩擦磨损而产生的噪声、振动速度和温升，进一步定量确定出纳米MoS2添加剂质量分数为0.1%时，可以最大程度地降低摩擦副的损耗.

This dataset focuses on the severe friction and wear issue occurring at the arc-shaped contact surface between the circular hammer and bar stock during precision blanking. The WTM-2E controllable atmosphere friction and wear tester was utilized to carry out friction and wear tests on the GCr15 steel block - 45 steel column friction pair under seven lubrication conditions, where the mass fraction of nano-MoS₂ additives was set to 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5% and 0.7% respectively. The main analysis was conducted on the tests under different loads. The worn surface morphology of the GCr15 steel block was observed using a scanning electron microscope (SEM), and the elemental composition of the worn surface was analyzed via energy-dispersive X-ray spectroscopy (EDS). The lubrication, anti-wear and self-repair mechanisms of the friction pair were discussed. The results show that: as the applied load increases, the frictional contact stress rises, leading to an upward trend in both the friction coefficient and wear loss, and the worn surface morphology transitions from mild abrasive wear to adhesive wear. Additionally, the anti-friction and anti-wear performance does not improve monotonically with the increase of MoS₂ additive content; the friction coefficient and wear loss first decrease and then increase as the mass fraction of nano-MoS₂ additives rises, and the optimal anti-friction and anti-wear effects are achieved when the mass fraction is within the range of 0.1% to 0.3%. By comparing the noise, vibration velocity and temperature rise of the friction pair caused by friction and wear under different lubrication conditions, it was further quantitatively determined that when the mass fraction of nano-MoS₂ additives is 0.1%, the loss of the friction pair can be minimized to the greatest extent.