THE RESEARCH OF LOADED CONDITION OF THE DEMOUNTABLE CUTTING-ROTARY DRILLING TOOL ELEMENTS WITH A TWOROW CUTTING STRUCTURE

A drilling tool is the most critical and highly loaded element of a drilling rod, on which the efficiency ofblastholedrilling largely depends. To improve the design of demountable drilling tools, complete information on the loads acting on the main bitelements is needed. This work studies the stress-strain state of a demountable cutting-rotary bit with gear-disc cutters (DRDF-244,5-2) with the use of finite-element design technologies of the ANSYS software environment. The calculations were performed under the maximum loads acting on the bit from the drilling machine and the bottom of the well and their uneven distribution over the bit elements. The results of the distribution of equivalent stress in the body of the bit, the axes of rotation, and gear-disccutters with two-row cutting structure are presented. The analysis of the bit performance under various operating conditions is also given.