The investigation on the machining process of BTA deep hole drilling

In this paper, a computer-based approach is presented to the investigation of machining mechanisms in boring and trepanning association (BTA) deep hol e drilling processes. The cutting mechanisms investigated are focused on th e chip deformation and associated drilling forces in deep hole situation in particular. The machining models are further investigated for such process es. The models are evaluated and validated based on the data acquired with a computer-based acquisition system. It is found that the chip deformation cut by the centre edge is the largest, whereas the change tendency of the c utting force and the sum of chip deformation cut by three blades of drill a re about the same. This paper also describes the measurement and analysis o f the forces including the axial force in BTA deep hole machining. (C) 2000 Elsevier Science B.V. All rights reserved.