Abstract
A new machining process, called auscutting, has been developed, in which the cutting operation is performed in supercooled austenitic state during quenching. In auscutting, the saw-toothed chip is formed and the chattering vibration occurs under some cutting conditions. In this paper, the relation between the chattering vibration and the periodic chip formation is investigated. The formation mechanism of the saw-toothed chip is considered by observing the micro structure of the surface of chips.
The results obtained are summarized as follows :
(1) The frequency of the chip formation is varied with cutting conditions. It increases with the increase of cutting speed, but decreases with the increase of depth of cut and feed.
(2) The micro slips occur continuously in the case of flow type chips. The cracks generate on the chip surface without the micro slips in the case of saw-toothed chips, when the shear strain exceeds a critical value.
