Quantitative Assessment of Diamond Particles on the Working Surface Diamond Drills

Vasilyeva M.I., Sharin P.P., Vinokurov G.G., Fedorov M.V.

In this work a quantitative assessment of protruding active diamond particles on the working surface of an experimental diamond drill with a metal-ceramic matrix during its operation was done. Previously a literature review on the methods of determining of the amount of abrasive grains on the working surface of a tool was performed. The main advantages and disadvantages of the methods for determining the cutting edges during a tool operation are discussed. The formation of microroughness occurs as a result of frictional interaction of contact surfaces of abrasive tool and material being processed. During processing, a mass micro-cutting with individual grains occurs, which together determines the productivity of a tool as a whole. Thus, one of the factors increasing the efficiency of a diamond tools is its surface condition. Other factors are connected with the improvement of its components and functional elements: diamond grains, ligaments, working layer structure. In this work, quantitative assessment of active diamond grains on the working surface of a tool was realized on the basis of metallographic analysis of the friction surface. The proposed method for determining the amount of cutting diamond grains on the working surface of the experimental diamond drill make it possible to evaluate and predict service properties of a working surface of a tool when operating in full-scale conditions.

Key words: diamond drill, metal-ceramic matrix, diamond grain, self-sharpening, surface relief.

 Science and Education, 2017, No.4, pp. 88-92.