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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
引用本文:张立军,韩琳,张德潇,李增辉,张军伟,金永山,王旱祥.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[J].摩擦学学报,2019,39(6):777-785.
作者姓名:张立军  韩琳  张德潇  李增辉  张军伟  金永山  王旱祥
作者单位:中国石油大学(华东) 机电工程学院,山东 青岛 266580
基金项目:国家自然科学基金项目(51575532)和中央高校基本科研业务费专项资金项目(15CX08007A)资助
摘    要: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. 

关 键 词:精密下料    圆形锤头-棒料摩擦副    纳米MoS2添加剂    减摩抗磨    载荷
收稿时间:2019-01-29

Friction and Wear Characteristics and Mechanism Analysis of Load and Nano MoS2 Additive on Circular Hammerhead-Bar
Institution:College of Electromechanical Engineering, China University of Petroleum, Shandong Qingdao 266580, China
Abstract:Aiming at solving the wear problem of the arc-shaped contact surface between the circular hammerhead and the bar in precision blanking, the tribological performance of GCr15 steel block-45 steel column tribo-pair was dertermined on a WTM-2E controllable atmosphere micro-friction and wear tester, under lubrication of oils containing nano-MoS2 additive (mass fraction of 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.7%), focusing on the friction and wear results under different loads. The worn surface of GCr15 steel was observed by scanning electron microscopy and analyzed by energy dispersive spectrometer. The possible mechanisms of lubrication and self-repair were discussed. The results show that increasing the applied load increased the contact stress, friction coefficient and wear. The wear regime varied from mild abrasive wear to adhesive wear. Friction coefficient and wear first decreased and then increased as the mass fraction of MoS2 additive increased. Oil with the mass fraction of MoS2 additive of 0.1% to 0.3% provided good lubrication. By comparing the noise, vibration speed and temperature rise of the tribo-pair, oil with 0.1% nano-MoS2 additive showed the best tribological performance. 
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