Active chatter suppression in turning of low-rigidity workpiece by system matching

Abstract

During the turning process, unstable self-excited vibration known as regenerative chatter adversely affects tool life, workpiece quality and productivity efficiency. Duo to the low-rigidity characteristic, workpiece chatter usually occurs rather than tool in turning of the low-rigidity workpiece. In this work, instead of improving workpiece rigidity by auxiliary sustaining device, an active control methodology is proposed to suppress chatter such that the area of stable cutting is increased and a higher productivity can be obtained. The methodology developed in this paper is based on dynamic system matching of tool and workpiece. Hereto, a fast tool servo (FTS) system is designed to realize system matching, and then the ability to suppress regenerative chatter is evaluated by turning a low-rigidity slender rod. The cutting experiment results demonstrate the validation of the proposed methodology in turning of the low-rigidity workpiece.