Development of drill cutters reinforced with cubic boron nitride and methodological bases for their testing

The article presents the results of testing experimental designs of drill bits reinforced with cubic boron nitride. A comparative assessment of the resource, speed and energy intensity of drilling with the developed tool, as well as with serial cutters, was carried out. The resource of the most efficient design of the experimental drill cutter is more than 9 times longer than the resource of a standard cutter with tungsten-cobalt cutting inserts. The drilling speed of the experimental and serial tools is practically the same. The energy intensity of drilling with the developed cutters and the serial cutter differs within the confidence interval. An exception is the experimental cutter with three feathers. The accuracy of determining the scope of the tool can be improved by using the developed express method for assessing the strength of rocks. The express method was developed based on the empirical relationship between the force required to penetrate the indenter into the borehole wall and the strength of the rock. The article presents the results of testing rocks and a description of the device for implementing the developed express method. The article describes the advantages of the proposed express method and its existing analogues. The results of the conducted studies indicate that the use of the developed express method ensures the determination of the strength of sedimentary and metamorphosed rocks with a confidence interval of ±22%.

Korneyev V. A. Development of drill cutters reinforced with cubic boron nitride and methodological bases for their testing. MIAB. Mining Inf. Anal. Bull. 2023;(11-1):116-129. [In Russ]. DOI: 10.25018/0236_1493_2023_111_0_116.

V.A. Korneyev, Cand. Sci. (Eng.), Assistant Professor, Siberian State Industrial University, Novokuznetsk, 654007, Russia, e-mail: korneev_va@list.ru, ORCID ID: 0000-0001-9135-4418.

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