Investigation of Machining Stability Considering Thermal and Rotation Effect: Effectiveness of Impact Excitation for a Rotating Spindle

This study investigates machining stability considering the rotational and thermal effects of a spindle-bearing system. Conventional method for analysis only has regarded static response spindle system, which does not represent actual conditions as some investigations mentioned. Bearing stiffness change caused by contact angle is applied to analytical approach dynamics At same time, in frequency function (FRF) rotating spindle, disturbance-induced signals are included such slip between hammer tool, run-out noise due insufficient impulse force. In this paper, conventional impact exciting been popular characterization refined order obtain dynamic characteristics system on consideration coherence function. Those disturbances output signal remarkably reduced through finding both optimal terms force filtering false responses. The proposed tests, can manage under conditions, lead provide FRFs matching more accurately. Stability lobe diagrams (SLDs) derived from obtained experiments were evaluate effectiveness characteristic bearing-spindle systems. As result, axial depth cut limitations at chatter occurrence points well matched limits with deviation 3% or less. Chatter vibration generation be estimated, proved that SLDs reveal cutting condition since it includes rotation during milling process.