High-Speed Milling of Heat-Resistant Alloys with Tools with High-Entropy Wear-Resistant Coatings

In the conditions of modern machine building, innovative materials with unique physical and mechanical properties and operating in a wide range of changes in operating temperatures, under intensive force impact on the structural elements of assemblies and as a consequence of a significant variable stress-strain state of individual parts sections are increasingly used. Such critical parts are processed on modern high-speed metalworking equipment equipped with expensive automatic or adaptive control systems. At the same time, the weakest link in the technological chain is the metal-cutting tool used in blade cutting operations. The paper presents the results of theoretical and experimental research aimed at improving the efficiency of milling of heat-resistant alloys based on the development and application of innovative nanostructured multilayer high-entropy coatings on metal-cutting tools. Methodologically the work was carried out in several interconnected consecutive stages: at the first stage thermodynamic substantiation of the possibility of obtaining and sintering of cathodes from high-entropic composition was realized; at the second stage development of technological process and development of modes of application of high-entropic coatings on end milling cutters of different sizes and at the third stage experimental tests at high-speed counter milling of heat-resistant chromium-nickel alloys. The experimental part included: carrying out high-temperature tribotechnical tests; carrying out studies of wear resistance of carbide end mills with high-entropy coatings, as well as the temperature and components of the cutting force during face counter milling of chromium-nickel alloys: EI-654; EI-698 VD.