摘要
When the machine tool is in the start-and stop-stages,the stick-slip phenomenon will be observed and highprecision positioning,machining accuracy and fretting feed will not be guaranteed. The most critical reason is that there is the difference between the dynamic and the static friction coefficients. Textures with different area ratios are fabricated on the surfaces of the upper PTFE-based composite and the friction tests are carried out on a reciprocating tribotester under the boundary lubrication and flat-on-flat contact conditions. The results show that there exists an optimal textured area ratio of 19.6% that can minimize the difference between the dynamic and the static friction coefficients.
机床处于刚启动或者将要停止阶段会出现爬行现象,此时无法保证机床的高精度定位、加工精度和微动进给,其最关键的原因是动摩擦系数和静摩擦系数之间存在差值。本文利用激光表面织构技术在PTFE基复合材料表面加工不同面积率的圆坑织构,并且在边界润滑条件和面对面接触摩擦形式下,使用往复式摩擦试验机进行摩擦试验。结果表明,织构面积率为19.6%时可以最大限度地减小动摩擦系数和静摩擦系数之间的差值。
基金
financially supported by the National Natural Science Foundation of China (No. 51675268)
