STUDY ON CHATTER VIBRATION IN RAMPING OF SCULPTURED SURFACES

摘要

An analysis of chatter vibration in ramping of curved surfaces using ball end milling has been presented. The dynamic cutting simulations were carried out in time domain, and the varying helix angle along the cutting edge of a ball end mill was considered. It was seen that chatter stability is higher for a convex surface than for a concave surface. It was also seen that the stability is higher for low milling position angles, and low for high milling position angles. Moreover, Right cross-feed, Upward cut results in higher stability than Left cross-feed, Upward cut. Experimental results show a fairly good agreement with the calculated ones. The work presented herein considered only two out of the four possible cutting modes. Further research is therefore, necessary to examine chatter stability in the other two cutting modes. Also, there is need to develop an analytical model for evaluation of chatter stability in milling of sculptured surfaces, since the time domain simulation is computationally expensive.