铸铁HT200、45~#钢、聚四氟乙烯、尼龙PA66滚动行为的对比分析研究

针对滚动摩擦中的弹性滞后效应问题,利用自行设计的滚动摩擦实验台,考察了HT200、45#钢、PTFE、PA66与HT200配副在不同载荷、速度下的滚动摩擦行为,利用CETR UMT-2型试验机及LKDM-2000轮廓摩擦磨损仪考察了PTFE和PA66的蠕变行为。对不同速度、载荷下滚动摩擦阻力及滚动摩擦系数的变化情况进行了研究,重点分析了滚动摩擦阻力与速度、载荷之间的耦合关系,从弹性滞后效应的角度分析了材料的黏弹性质对滚动摩擦行为的影响机理。研究结果表明:滚动摩擦系数随速度增加而增大,HT200、45#钢、PTFE和PA66的滚动摩擦系数之比约为1∶0.99∶1.03∶1.05;滚动摩擦阻力随PV值增加而增大,且二者间存在线性关系,PTFE和PA66拟合直线的斜率显著高于HT200、45#钢。

Comparative investigation on rolling behavior of HT200,45# steel,PTFE and PA66

Aiming at the elastic hysteresis effect in rolling friction,the rolling friction behavior under different loads and velocities of HT200,45# steel,PTFE and PA66 were studied through experiments on a self-made rolling friction testing equipment and the creep property of PTFE and PA66 were investigated by experiments on CETR UMT-2 and LKDM-2000 equipment.During experiments,the rule that the rolling fric-tion force varies with velocities and loads was focused and the action mechanism that visco-elastic properties of materials influence the rolling friction was analyzed.In addition,the law that the rolling friction coefficient varies with velocities and loads was discussed at the same time.The results indicate that the rolling friction coefficient rises up with the increment of rolling velocities.The ratio of rolling friction coefficient of HT200,45# steel,PTFE and PA66 was about 1:0.99:1.03:1.05.The rolling friction force was roughly proportional to the value of PV and the fitting-line slopes of PTFE and PA66 was apparently higher than that of HT200 and 45# steel.