Abstract
In the aviation industry, a turbine casing of a jet engine has been lightened and thinned to improve the mileage. Chatter vibration can occur during machining of a low rigidity workpiece. Chatter vibration causes decline in processing accuracy, wear of cutting tool and undesired noise. The previous study reported chatter vibration can be suppressed by arranging the multiple tuned mass dampers (TMDs) at unequal pitches in the circumferential direction on the inner wall of workpiece. This study examines the optimum arrangement of TMDs in the circumferential direction to improve chatter suppression effect. An index for chatter vibration occurrence was defined from the predicted chatter vibration mode shapes when multiple TMDs were attached to a thin-walled cylindrical workpiece. The TMDs arrangements with high and low chatter suppression effect were determined by proposed indicator, and the chatter suppression effect was compared by performing cutting test for each of the TMDs arrangements. Consequently, it was confirmed the difference in the suppression effect of multiple TMDs attached to the workpiece at unequal pitch in the circumferential direction.
