Borehole milling tool and ways to improve its cutting part

The article proposes the design of the cutting part and its reinforced material, which allows to prevent intensive work of the cutter in its central part and maximise the destructive potential of the tool. In this regard, a rational geometric parameter of the milling cutter's cutting part is determined by creating and studying a mechanical-mathematical model of the interaction process between the milling tool and the object to be destroyed, based on the theory of wear of mating surfaces. Since in the process of destruction there is a detachment of fine chips from the emergency facilities, contributing to intensive and uneven wear of the reinforcing structure, a milling tool whose cutting part is equipped with a cavitation-exciting element is developed. Possible dynamic loads on the rock-cutting tool due to the creation of cavitation loads have been experimentally determined and the possibility and necessity of drilling operations with the use of cavitator in the drilling tool arrangement have been confirmed. To address the uneven wear of the cutting part of the milling tool and to strengthen the radial hardening contours from the periphery to the centre when using a composite alloy with a non-uniform composition of granular solid filler, the analogy of the process of actualisation of composite surfacing with the Markov process was used. For this purpose, on a special bench, studies were carried out with a measurement step of 30 min. to synthesise the areas of compatibility of operational parameters with physical and mechanical properties of the destroyed emergency facilities, reinforcing parameters and design of downhole cutting tools.