On the Dynamic Behavior of Machine Tool Slideway : 1st Report, Characteristics of Static Friction in "Stick Slip" Motion

Abstract

On an actual machine tool slideway, the "stick slip" motion of moving element is investigated experimentally under various sliding conditions, that is a variety of applied lubricant, mass of moving element, stiffness of driving system and driving speed, and the fundamental characteristis of the "stick slip" motion are clarified. Basing on these experimental results, in order to make the "stick slip" process clear, the characteristics of static friction in the period of "stick" are first studied concretely. As a result, it has been shown that the static frictional coefficient generally increases with increasing "stick" time, and that it can be expressed with a simple exponential formula by the "stick" time. Then, the transitional behavior of boundary lubricated mecahnism in slideway in the "stick" period is discussed in detail basing on the experimental results.