Investigating the Vibration assisted rock drilling in longitudinal-torsional direction

Abstract

To address the issues of high axial force and slow cutting speed in traditional rock drilling, this paper proposes a longitudinal-torsional coupled vibration assisted rock drilling scheme. Theoretical modeling of rock drilling under longitudinal-torsional coupled vibration assistance is presented, followed by finite element simulations of traditional drilling, longitudinal vibration drilling, torsional vibration drilling, and longitudinal-torsional coupled vibration drilling. Results show that longitudinal-torsional coupled vibration drilling reduces the maximum axial force by 36.32% and increases the drilling speed by 36.28% compared to traditional drilling. Experimental validation shows a reduction in strain of the drill bit support by 35.48% and a 31.25% increase in drilling speed during longitudinal-torsional coupled vibration drilling compared to torsional vibration drilling. Study demonstrates that longitudinal-torsional coupled vibration drilling is a more efficient method for rock drilling than other methods.