Abstract
In this study titanium nitride coated high speed steel drills of diameter 0.3 mm are employed to clarify the behaviors of titanium coated micro drill during the drilling of minute holes, the geometrical relationship between the cutting edge and feed, wear of the cutting edge, chip shape, cutting edge movement in quick stop test and burr shape are investigated. Results reveal that a plane about 10 μm in diameter exist at the cutting edge of a micro drill at the portion connecting the face and the flank, and that the edge of this plane is responsible for the cutting action. The cutting mechanism is indicative of the resulting large negative rake angle created across the entire cutting edge which as is evident in the study greatly influences chip shape, cutting edge wear and peeling off of the coating layer.
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