The Study Of The Process Of Difficult-To-Machine Materials Cutting At The Micro-Level

Introduction. The quality of the carbide cutting tool, characterized by sharpness (the usual inscribed radius of curvature of the blade), the size of microcracks and microshare, as well as the microhardness of the surfaces of the cutting wedge determines the quality of the treated surface and the final accuracy of the parts. The modem cutting tool together with technological system allows to receive accuracy or processing within 0.01...0.02 mm and the roughness of the treated surface R-a = 0.32...0.63 mu m. The purpose of' the work is to study the cutting process of difficult-to-machine materials at the micro-level, to determine the performance of carbide tools in terms of the possibility of chip formation in the processing of small thickness or the cut layer Method. A method for studying the process of cutting difficult materials at the micro level (full-scale tests) with the use of high-quality carbide cutting tools obtained by a new method of ultra-high-speed sharpening is proposed. Results and discussion. The possibility of improving the efficiency of carbide cutting tools, which is understood in the work as a given dimensional accuracy of machining parts from hard materials in a few micrometers and a stable roughness of the treated surface with sufficient tool life, using high-quality tools obtained by high-speed sharpening is substantiated and experimentally confirmed. High-quality carbide cutting tools obtained by ultra-high-speed sharpening has prospects for use in aircraft and rocket-building enterprises in the manufacture of key high-precision parts from difficult materials. The conducted experiments on the study of the cutting process of difficult materials at the micro-level to determine the ratio of the thickness of the cut layer of the processed material to the conventional inscribed radius of rounding of the cutting tool blade, allow to determine its performance and determine the maximum dimensional accuracy of the blade processing.