Dependence of the drilling speed on the frictional forces on the cutters of the rock-cutting tool

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Authors:

M.T.Biletsky, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0002-4947-5686, Caspian Public University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

A.A.Kozhevnykov, Dr. Sc. (Tech.), Prof., orcid.org/0000-0002-6876-4168, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

B.T.Ratov, Dr. Sc. (Tech.), Prof., orcid.org/0000-0003-4707-3322, Caspian Public University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

V.L.Khomenko, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0002-3607-5106, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Forecasting the deepening in one revolution and the mechanical drilling speed, taking into account the decrease in the actual axial load due to the action of the frictional force.

Methodology. The analytical model of the vertical and horizontal displacements of the indenter along the surface of the rock has been improved. It is detailed with reference to drilling of boreholes with crowns of cutting type taking into account the reduced actual axial load, acting on the cutter, on rocks with physical and mechanical properties.

Findings. It is established that during the drilling, the true axial load is less than the nominal load due to the frictional force arising on the front of the tool. The one-turn and the mechanical drilling speed are predicted taking into account the decrease in the actual axial load due to the action of the vertical friction force. It has been revealed that as the width of the tool is reduced, the axial load losses increase due to friction forces, and the deepening per rotation and the drilling speed decrease more intensively.

Originality. For the first time, the influence of the frictional force, which appears on the front of the tool of the rock cutting tool on the true axial load, the depression in one turn and the mechanical drilling speed, is shown. New analytical dependencies are proposed that allow one to predict the depth per one revolution and the mechanical drilling speed taking into account the design of the rock cutting tool and the geological and technical conditions of dri­lling.

Practical value. The developed model of the interaction of cutting allows predicting the results of the application of various designs and technologies for the development of a rock-sensing tool more reliably, as well as choosing rational technologies for their application to achieve maximum technical and economic indicators.

References.

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2. Ratov, B. T., Khomenko, V. L., Bayboz, A. R. and Delikesheva, D. N., 2017. Classification of the drilling hard-alloy tool. Mining journal of Kazakhstan, 11, pp. 31‒38.

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11. Sysoyev, N. I., Burenkov, N. N. and Hung, Ch. К., 2016. Justification of the structure and choice of rational design parameters of the drill cutter reinforced with diamond-hard alloy plates. North-Caucasian region. Technical science, 2(190), pp. 77‒83. DOI: 10.17213/0321-2653-2016-2-77-83.

12. Zaitsev, V. I., Karpikov, А. V. and Che, V. V., 2014. Efficiency of using PDS bits. Siberian Branch of the Earth Sciences Section of the Russian Academy of Natural Sciences. Geology, exploration and development of mineral deposits, 5(48), pp. 58‒66.

13. Biletsky, M. T., Ratov, B. T., Kozhevnykov, A. А., Baiboz, A. R. and Delikesheva, D. N., 2018. Updating the theoretic model of rock destruction in the course of drilling. News of the National Academy of Sciences of the Republic of Kazakhstan. Series of geology and technical sciences, 2, pp. 63‒71.

14. Zhabin, А. B., Poliakov, A. V., Averin, E. A. and Sarychev, V. I., 2018. The state of scientific research in the field of rock destruction by the incisive tool at the turn of the century. Tula State University. Earth sciences, 1, pp. 230‒247.

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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