机床部件以蠕动速度(1mm/min以下)在进给机构导轨上移动时,接触压力P=N/S(式中N——移动部件的重量和切削力的负荷,S=导轨工作面积)是影响移动精度和均匀性的最主要的因素之一。因此,我们研究了压力P对摩擦系数f和自振幅A(也就是对导轨防爬性能)的影响。根据分子力学摩擦理论,爬行滑动速度下激发自振是可以解释的。由于导轨实际接触面 The contact pressure P = N / S (N - the weight of the moving part and the load of the cutting force, S = the working area of ​​the guide rail) when the machine tool part moves on the feed mechanism guide rail at the peristaltic speed (1mm / min or less) One of the most important factors affecting the accuracy and uniformity of movement. Therefore, we study the effect of pressure P on the friction coefficient f and the self-amplitude A (that is, the creep resistance of the rail). According to the theory of molecular mechanics friction, it is possible to explain the self-excitation under the creep sliding velocity. Due to the actual contact surface of the rail