Abstract
In this study, the relation between tool-work thermo-electromotive force (E. M. F.) and the condition of chip flow out, vibration of a tool or work, cutting force and chip shearing frequency are discussed. As the fluctuating amplitude of E. M. F. is generally small below 1 mV, it is necessary to improve the electric circuit of a thermo-couple and also to increase S/N ratio, in order to measure it precisely. Experiment is performed using spectrum analysis technique, self-correlation and cross-correlation technique. The results obtained are as follows.
(1) It is possible to recognize the states of chip formation by analyzing a wave form of E. M. F.
(2) As E. M. F. includes the information of shearing period and vibration frequency of a tool or work, it can be utilized as a way of analysis of the metal cutting process or a pickup sensor of vibration.
(3) E. M. F. easily follows the cutting phenomenon in the range of ultra-sonic frequency.
