PRODUCTION TESTS OF A NEW DESIGN DRILL BIT WHEN DRILLING WELLS IN A QUARRY

Abstract. The article considers production tests of a new design drill bit for drilling holes in a quarry. The main attention is paid to studying the resource and drilling speed of a drill bit with carbide inserts of a new design. Purpose. It is to increase the drilling speed by using the proposed new design of cutting inserts made of a cermet alloy using the example of the KNSh-90M drill bit. Methodology. The research methodology is based on a combination of experimental, analytical and mathematical approaches. Experimental part: synthesis of alloys of different compositions (using powder metallurgy technologies or other methods) and formation of carbide inserts of non-standard sizes. Use of statistical methods to build models of the dependence between the alloy composition and its tensile strength. Correlation analysis to assess the significance of each component and validation of results - comparison of the obtained results with the data given in the literature and substantiation of the optimal composition of the hard alloy to ensure maximum performance when drilling wells in a quarry. Results. A new design of a drill bit has been developed for drilling explosive wells in a quarry. The improved design has hard alloy inserts of a new two-layer composition. Scientific novelty. Application of a comprehensive analysis of the composition of the material and its influence on the key mechanical characteristic - the bending strength. This scientific novelty consists in studying the relationship between the composition of hard alloy inserts (in particular, the proportions of cobalt, tungsten and other components) and the structural features of the material and makes the article relevant both for fundamental science and for industrial practice, contributing to the development of innovative approaches in creating materials with improved characteristics. Practical significance. Optimization of the composition of the hard alloy to achieve a balance between strength and wear resistance, assessment of the impact of introducing alloying elements or modifying the matrix. Keywords: well, bit, bending strength, carbide insert, rock-breaking tool.