The term "deep holes" is used to describe the machining of holes with a relatively large length to diameter ratio. The main feature of BTA deep hole drilling is the stabilization of cutting force necessary for the self guidance of the drill head. An additional feature is the cutting tool edges that are unsymmetrically placed on the drill head. There is an increasing need to predict the hole geometry and other dynamic stability behavior of deep hole drilling guidance. In this study, the effects of BTA deep hole drilling conditions on the hole profile machined piece are analyzed using domain analysis technique. The profile of deep hole drilled work piece is related to cutting speed, feed rate, chip flow, tool wear, and etc. This study deals with the experimental results obtained during the BTA drilling on S45C, S55C carbon steels and SCM 440 steels under various cutting conditions, and these results are compared with analytical evaluations.
The deep hole drilling is a process of machining hole that have high length to diameter ratio, typically with hole length ranging from 5 times up to more than 100 times the diameter. It can be classified as BTA(Boring and Trepanning Association) drilling and gun drilling. BTA drilling differs from the conventional gun drilling in tip configuration, fluid induction and chip removal. However, they have similar guiding and supporting bearings. The tool for deep hole drilling is mounted in the tubular shank. The cutting tip cuts the workpiece in the circular direction and moves in the direction of tool axis. The tools used for deep hole drilling is a specially manufactured horizontal lath that has a large flux and high pressure fluid system.
