Accelerated testing of rock and drilling tool interaction

Abstract

The article describes the methods of accelerated reliability, strength, wear resistance and cutting capability testing of drilling tools. The design solutions are proposed for the comparative accelerated testing of cutting elements—plates, cutters, crowns, at their contact with rocks of various hardness and abrasiveness. The design of the experimental setup using the weight method of wear control with regard to geometric parameters of a tool is proposed. The nature and amount of wear are duplicated by testing samples on the machine MI-1M, which ensures satisfactory assessment of the wear rate. Based on the dependencies and patterns obtained, it is possible to create a mathematical model of the drilling process with the assessment of the reliability and durability of tools. The proposed approach allows optimizing the cost of drilling. In practice, the tools equipped with diamonds, hard-alloy plates and pins are often unjustifiably used, which is confirmed by the experimental studies. The accelerated testsare needed to determine the actual cutting parameters. It is noticed that a new tool is characterized by a higher productivity, which, with the wear of the tool, i.e. with the change in the geometry of the cutting part of the tool, decreases with the simultaneous increase in the torque and axial force of the tool. Tests of cutting tools on an experimental plant open up opportunities for improving the design of the tools, as well as for creating special mobile small-sized devices for periodic restoration of geometry of cutting elements immediately in operation. The proposed plant was designed by the scientists of the Applied Geology and Mining Department of the Belgorod State University and can be used by scientific organizations and production companies associated with rock drilling, including under a business contract.