Dry Friction Model of Percussive Drilling |
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| Authors: | Krivtsov Anton M Wiercigroch Marian |
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| Institution: | (1) Department of Theoretical Mechanics, St.-Petersburg State Technical University, Politechnicheskaya Street 29, 195251 St.-Petersburg, Russia;(2) Department of Engineering, Fraser Noble Building, King's College, University of Aberdeen, Aberdeen, AB24 3UE, UK;(3) Present address: Department of Engineering, University of Aberdeen, Fraser Noble Building, King's College, Aberdeen, AB24 3UE, UK |
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| Abstract: | It is postulated that the main mechanism of the enhancement of material removal rate (MRR) in percussive drilling is associated with generating impact forces, which act on the workpiece 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 experimentally observed fall in MRR at higher static forces. |
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| Keywords: | Nonlinear oscillations Dry friction Drilling |
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