Suppression of the Work-Piece Vibrations in Milling Using Active Clamp System

The machining is always accompanied by vibration. In certain cases the level of vibration is very high and may cause shortening of the tool life, poor quality of machined surface. Operational speed and machined surface depend on dynamic stability of three components of the machine tool-cutting system: the cutting tool, the machine tool structure, the work-piece and the clamping system. To assure stable machining, parameters of the cutting process have to be tuned and frequently the machining productivity is decreased. For this reasons different types of systems are developed for suppressing the work-piece vibration. In some cases an additional modification of the work-piece is allowed and mounting the vibration absorber is possible. The paper describes a modification of the work-piece dynamic properties using active clamp system. In comparison to the vibration absorbers this solution has a great advantageous - adaptation of the work-piece is not necessary. In the paper the simulation results of different variants of milling process with work-piece mounted using the active clamp are presented. Piezo actuators are used in order to assure active influence on the work-piece. The aim of the state space feedback control system is to minimize the amplitude of the vibration during machining process.