Dynamic Stiffness of Machine Tool Feed Driving System : 1st Report, Theoretical Analysis on the Damping Capacity of Slideway

Abstract

The present paper makes it clear that Coulomb friction which acts on slideway of machine tool has an ability to damp a fluctuating external force and this capacity can be evaluated as an equivalent viscous damping which consumes the same amount of energy with the friction during one period of vibration. It is shown that the dynamic stiffness of a feed driving system attached with a hydrodynamic slideway, which usually possesses Coulomb friction, can be theoretically estimated if the corresponding equivalent damping is considered by the present theory.