Increase of chip removal rate in single-lip deep hole drilling at small diameters by low-frequency vibration support

摘要

In order to promote active chip breakage in machining with single-lip drills for drilling deep holes with small diameters, vibration-assistance can be effectively applied. The aim of this work is to investigate the influence of low-frequency and high-amplitude vibration-assistance on the chip formation of age-hardened copper-zirconium for small diameters down to 0.94 mm and L/D-ratios up to 40. The interrelation of vibration and process parameters, like the resulting uncut chip thickness and effective velocity, is described by a kinematic model. The influence of the vibration-assistance on the chipping behavior is investigated by means of FEM-simulation and experimental analyses using a piezo-actuated test setup. (C) 2019 Published by Elsevier Ltd on behalf of CIRP.