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Aleksandr B. Zhabin
Aleksandr B. Zhabin
Professor
Tula State University
Professor
Tula State University
Tula
Russia
173
Total cited
6
Hirsch index

Articles

Mining
  • Date submitted
    2020-07-04
  • Date accepted
    2021-03-29
  • Date published
    2021-09-20

Transition between relieved and unrelieved modes when cutting rocks with conical picks

Article preview

In the modern theory of rock cutting in production conditions, it is customary to distinguish two large classes of achievable cutting modes – relieved and unrelieved. The kinematics of rock-breaking machines in most cases determines the operation of the cutting tool in both modes in one cycle of the cutting tool. The currently available calculation methods have been developed for a stable, usually unrelieved cutting mode. In this article, the task is set to determine the conditions for the transition between cutting modes and the modernization of the calculation method for determining the forces on the cutting tool. The problem is solved by applying methods of algebraic analysis based on the search for the extremum of the force function on the cutter, depending on the ratio of the real cut spacing to the optimal spacing for the current chip thickness. As a result of solving the problem, an expression is obtained for determining the chip thickness, for which, at the specified parameters, the transition between the relieved and unrelieved cutting modes is provided. The obtained result made it possible to improve the method of calculating the forces on the cutting tool in the areas of the cutter movement with relieved cutting.

How to cite: Averin E.A., Zhabin A.B., Polyakov A.V., Linnik Y.N., Linnik V.Y. Transition between relieved and unrelieved modes when cutting rocks with conical picks // Journal of Mining Institute. 2021. Vol. 249. p. 329-333. DOI: 10.31897/PMI.2021.3.1
Mining
  • Date submitted
    2019-07-23
  • Date accepted
    2019-09-19
  • Date published
    2019-12-25

Estimation of abrasiveness impact on the parameters of rock-cutting equipment

Article preview

Development of equipment, which provides access to underground mineral deposits and their extraction, requires the use of all the accumulated experience and advanced scientific research in the area of mechanical rock cutting. The most important issues of using mechanical rock cutting tools are their wearability and consumption, which have an impact on technical and economic indicators of project efficiency. The paper describes Russian and foreign practices of estimating tool wear resistance, expressions to determine critical cutting speed, methods to evaluate tool consumption. It is demonstrated that wearability of mechanical tools and associated effects are to a large extent defined by rock abrasiveness. It is highlighted that in Russia the index is calculated using Baron-Kuznetsov method, which is briefly described in the paper. In many countries with a highly-developed mining industry, rock abrasiveness is estimated with a Cerchar  Abrasiveness Index (CAI), recommended by the International Society for Rock Mechanics. Its description is also presented in the paper.

How to cite: Zhabin A.B., Polyakov A.V., Averin E.A., Linnik Y.N., Linnik V.Y. Estimation of abrasiveness impact on the parameters of rock-cutting equipment // Journal of Mining Institute. 2019. Vol. 240. p. 621. DOI: 10.31897/PMI.2019.6.621
Geoecology and occupational health and safety
  • Date submitted
    2016-08-30
  • Date accepted
    2016-10-30
  • Date published
    2017-02-26

Gas-dynamic processes affecting coal mine radon hazard

Article preview

The paper focuses on vertical migration of radon in surrounding rocks described by Fick's first law as well as by the continuity equation for diffusion flow, with allowance for sorption and radioactive decay processes. Taking into account special characteristics of vertical radon diffusion, the process can be considered stable. It is demonstrated that for productive areas it is feasible to consider one-dimensional convective diffusion, as diffusive transport of radon by the air of productive areas occurs at steady-state conditions. Normally the factor of radon emissions prevails if atmospheric pressure is constant. Amount of air, calculated using this factor, by 20-30 % exceeds the one needed to dilute carbon dioxide to maximum allowed concentration (MAC). 

How to cite: Efimov V.I., Zhabin A.B., Stas G.V. Gas-dynamic processes affecting coal mine radon hazard // Journal of Mining Institute. 2017. Vol. 223. p. 109. DOI: 10.18454/PMI.2017.1.109
Without section
  • Date submitted
    1990-09-24
  • Date accepted
    1990-11-13
  • Date published
    1991-03-01

Влияние шага разрушения на удельную энергоемкость процесса взаимодействия механогидравлического инструмента с горными породами

Article preview

Шаг разрушения  t  (расстояние между соседними внедрениями) является основным фактором, определяющим процесс взаимодействия механогидравлического инструмента с горным массивом ...

How to cite: Zhabin A.B., Plekhanov A.S., Gruzintsev A.A., Marshinkovskii I.G. // Journal of Mining Institute. 1991. Vol. 126. p. 59.