An investigation on the dynamic behavior of the BTA deep hole drilling process – increasing the process stability and sustainability

To realize the length to diameter ratios when BTA deep hole drilling long and slender tool-systems, consisting of drill head and boring bar are used, which have low dynamic torque and bending stiffnesses. Due to the low rigidity, process disturbances can occur during BTA drilling, which can jeopardize process reliability and process stability. Possible consequences of this instability can be increased tool wear, high noise emission and unusable workpieces. In earlier studies, mostly torsional and bending vibrations were analyzed. In this work, the measured vibrations in the longitudinal direction/feed direction are investigated to estimate an influence on the process stability.