Suppression of Chatter Vibration in Inner-Diameter Cutting

抄録

The accuracy of a workpiece produced using metal-cutting machine tools is decided by the deviation at the cutting point from the demanded working displacements between the workpiece and tool. Chatter vibration, which is the most important phenomenon among the dynamic characteristics of machine tools, is hard to suppress after machine tools have been constructed. Also, the elimination of chatter vibration is important in order to improve cutting accuracy and productivity of the cutting operation. In this study, the structural dynamics of machine tools are identified by a normal transfer function that determines the necessary design change from simulation by FEA. The predicted local effects of component modification computed by FEA to improve the dynamic performance by reducing chatter were found to coincide with those observed in a practical cutting operation. This study shows that modification of structural units to overcome chatter is an effective and cheap way of improving the cutting performance, and reveals how the stiffness changes with changes in the stability.