Dependence of the drilling speed on the frictional forces on the cutters of the rock-cutting tool

M. T Biletskiy, Anatolii Kozhevnykov, Boranbay Ratov, Володимир Львович Хоменко

2019

Closed access Metadata (CSL-JSON)
DOI 10.29202/nvngu/2019-1/22
Data confidence 70 medium
How this score is calculated

It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.

Abstract

dePendenCe of the drillinG SPeed on the friCtionAl forCeS on the CutterS of the roCk-CuttinG toolPurpose.Forecasting the deepening in one revolution and the mechanical drilling speed, taking into account the decrease in the actual axial load due to the action of the frictional force.Methodology.The analytical model of the vertical and horizontal displacements of the indenter along the surface of the rock has been improved.It is detailed with reference to drilling of boreholes with crowns of cutting type taking into account the reduced actual axial load, acting on the cutter, on rocks with physical and mechanical properties.findings.It is established that during the drilling, the true axial load is less than the nominal load due to the fric tional force arising on the front of the tool.The oneturn and the mechanical drilling speed are predicted taking into account the decrease in the actual axial load due to the action of the vertical friction force.It has been revealed that as the width of the tool is reduced, the axial load losses increase due to friction forces, and the deepening per rotation and the drilling speed decrease more intensively. originality.For the first time, the influence of the frictional force, which appears on the front of the tool of the rock cutting tool on the true axial load, the depression in one turn and the mechanical drilling speed, is shown.New ana lytical dependencies are proposed that allow one to predict the depth per one revolution and the mechanical drilling speed taking into account the design of the rock cutting tool and the geological and technical conditions of dri lling. Practical value.The developed model of the interaction of cutting allows predicting the results of the application of various designs and technologies for the development of a rocksensing tool more reliably, as well as choosing ra tional technologies for their application to achieve maximum technical and economic indicators.