On the Dynamic Behavior of Machine Tool Slideway : 2nd Report, Characteristics of Kinetic Friction in "Stick Slip" Motion

The properties of the "stick slip" motion occuring in the machine tool slideway are closely connected with the characteristics both in static and kinetic friction. In a previous paper, the static friction in the "stick" period was investigated. It has been shown in this paper that the characteristics of kinetic friction in the "slip" period can be examined collectively using the mean kinetic frictional coefficient μm in this period, and that the main factors which affect μm are the static frictional coefficient at the beginning of the "slip" motion and the time of the "slip" period. As a result, an expression for μm is proposed. Then, basing on the expressions for static and kinetic friction, the boundary conditions for occurrence of the "stick slip" motion are clarified, and the relation between properties of the "stick slip" motion and frictional characteristics is examined quantitatively.