Ultra-high-speed sharpening and hardening the coating of carbide metal-cutting tools for finishing aircraft parts made of titanium alloys

Abstract

The work is devoted to the creation of a hard-alloy tool for finishing processing of heat-resistant and titanium alloys. Objective: to increase the efficiency of carbide blade tools for finishing machining of aircraft parts of heat-resistant and titanium alloys by means of ultrafast grinding, to determine the method of hardening the cutting part and the conditions of its operation. Subject of the research: the quality of the cutting wedge (conditional inscribed radius of the blade rounding, the presence of microchips, blockages and microhardness) obtained by ultrafast grinding and work-hardening of the cutting part and the determination of the conditions of its operation. Objectives: to implement the method of carbide tools ultrafast sharpening, providing the required quality of the cutting wedge, characterized by the conditional inscribed radius of rounding of the blade, the presence of microchips, blockages and microhardness, capable of producing blade processing of parts from heat-resistant and titanium alloys with an accuracy of 3…5 microns and roughness of Ra 0.2…0.4 microns; to investigate the process of superfast sharpening and to determine the effect of sharpening modes of carbide metal cutting tools on the quality of the sharpened tools cutting wedge; to investigate the reason for the reduction of the durability of the cutting tool while reducing the rounding radius of the blade and to determine the composition of the hardening coating, which slightly reduces the sharpness of the blade; to investigate the influence of cutting modes of finishing heat-resistant and titanium alloys with a tool blade sharpness up to 5 microns on its durability, as well as the surface roughness and accuracy of the part. Research methods: electron microscopy (Jeol JCM-5700, an energy-dispersive spectrometer attachment JED-2300; NTEGRA PRIMA (NT-MDT)); optical microscopy (MikroCad Premium, ODSCAD measurement program; Axio Observer.A1m); vibrodynamic analyzer (DIANA-2M); coating thickness measurement method (Calotest CAT-S-0000); microhardness measurement method (PMT-3 and DM 8 B AFFRI); determination of the characteristics of the tribotechnical properties by the method of testing for friction and wear (II5018); determination of cooling capacity (Compaton). Theoretical and calculation methods: simulation method; end element method; methods of mathematical statistics.