Study of microhardness of surface layer of carbide cutting tools
Relevance. The performance of a carbide tool in the finishing of difficult materials depends on many of its parameters, one of which is the microhardness of the cutting wedge. The purpose of the work is to study the microhardness of the surface layer of the carbide cutting tool in the classical and ultra-fast sharpening, as well as using a hardening coating. Method. Used method of control of the microhardness of the surfaces of the cutting wedge with the use of microthermometric PMT-3 and B AFFRI DM 8, and elemental composition has been determined through raster EVO50 microscope by Carl Zeiss (Germany) and Jeol JCM-5700 (Japan), through the nozzle energy-dispersive spectrometer JED-2300. Results. The results of the study of the microhardness of the cutting wedge surfaces in the classical and ultra-high-speed sharpening are presented, and the reason for the decrease in microhardness, which consists in the oxidation of the cutting wedge during sharpening, is also justified. Application area. 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 hard-to-finish materials at the finish operations. Conclusions. The microhardness of the treated surfaces of interchangeable carbide plates (ICP) was studied; the change in the elemental composition of the surface layer of the ICP and the grinding head during sharpening was studied; the level of oxidation of the treated surfaces of the ICP during sharpening was determined.