Improving shearing efficiency of percussion rotary drill bits

The article presents the analysis of well-known drilling methods. The scheme of forces on a drill tool and the oscillograms of varied impact force in different-type drilling in rocks are considered. Based on the comparative analysis, a new approach to force impact on drilling tool is proposed to increase drilling efficiency, namely, to make a drill bit penetrate rocks along a helical path at a pitch selected from the condition of the most effective shearing. The mathematical and physical modeling of drill bit penetration in rock mass depending on the angle of impact load application reveals significant effect of this parameter on the efficiency of shearing. The studies into the process of drill pit penetration with rotation in rock mass on a specially designed test bench prove the more efficient use of the unit impact energy for shearing. The presented results of the mathematical and physical modeling of drill bit penetration in rock mass depending on the angle of impact point at expediency of further research to optimize impact angle and energy as function of physical and mechanical properties of rocks and for determining the effect of drilling tool geometry on drilling efficiency.

Grinko A. A., Sysoev N. I., Grinko D. A. Improving shearing efficiency of percussion rotary drill bits. MIAB. Mining Inf. Anal. Bull. 2020;(9):102-115. [In Russ]. DOI: 10.25018/0236-1493-2020-9-0-102-115.

The study was supported by the Russian Foundation for Basic Research, Project No. 19-35-90079

A.A. Grinko¹, Graduate Student, e-mail: nextdingo@mail.ru,
N.I. Sysoev¹, Dr. Sci. (Eng.), Professor, e-mail: sysoevngmo@gmail.com,
D.A. Grinko¹,Cand. Sci. (Eng.), Assistant Professor, e-mail: dingo17@mail.ru,
¹ M.I. Platov South-Russian State Polytechnic University (NPI), 346428, Novocherkassk, Russia.

A.A. Grinko, e-mail: nextdingo@mail.ru.

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