In mining minerals by open-cast method, the environment is exposed to a powerful man-made impact, a significant part of which is associated with mass explosions during rock crushing. In preparation of rocks for excavation by blasting, a significant amount of dust and gases is emitted into the atmosphere; therefore, a decrease in the use of explosives is an urgent task both in terms of reducing the cost of blasting operations and from the ecological point of view. This task can be solved by increasing the effectiveness of the explosion. The results of studies of the process of blasting boreholes with a non-circular cross-section confirm the practical need in developing this drilling tool. In using the kinematic method applied in engineering for assigning complex surfaces, the conditions under which it is possible to produce boreholes with a non-circular cross-section are considered. The designs of the drilling tool with variable and fixed linear dimensions are selected which allow formation of a noncircular cross-section of the borehole, their shortcomings have been analyzed. The roller-cutter method for forming a noncircular cross section is substantiated, at which a smaller number of kinematic links of the drilling tool is achieved and a greater number of ways to impact the rock is ensured. Keywords-rock drilling, kinematic analysis of drilling tools, non-circular shape of a borehole, design of the drilling tool, drilling tool roller
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