Nonlinear dynamics of percussive drilling of hard materials

摘要

It is postulated that the main mechanism of the enhancement of material removal rate (MRR) in percussive drillingis associated with generating impact forces, which act on the work-piece and help to develop micro-cracking in the cutting zone. The inherent non-linearity of the discontinuous impact process is modelled as a frictional pair, to generate the pattern of the impact forces. A novel formula for calculating the MRR is proposed, which explains the experimetnally observed fall in MRR at higher static forces.