The Vibration of a Hydraulically Driven Table in Milling

Abstract

Some of the tables of machine tools vibrate in the cutting process, no matter how uniformly they move when the machine is not working. In this paper, the vibration of a hydraulically driven table is analysed theoretically on the basis of the pressure-flow characteristic of flow control valve, the equation of continuity for oil flow, the equation of motion for sliding element, the friction-velocity relation between sliding surfaces, and the relation between the table motion and the cutting force. An experimental verification of theoretical analysis is made using the vertical milling machine of which the table is driven by hydraulic power.