Problems of increasing the effectiveness of edge cutting machining by cutting metals via improving the tribological properties of the multicomponent coatings to be deposited on the cutting tool have...
The article proposes and substantiates the function of predictive evaluation using the criterion of the relative efficiency of using a cutting tool with a microtextured rake surface based on tangential force and cutting temperature. Comprehensive durability tests carried out under various processing modes with the measurement of heat power parameters made it possible to create an experimental base for mathematical modeling. An empirical model of cutting parameters based on modified multiplicative functions with non-constant indicators in the form of linear dependencies on processing factors was used based on planning an experiment for processing a heat-resistant alloy for predictive wear assessment in order to determine rational cutting modes. Predicting the rational use of a cutting tool with a microtextured work surface made it possible to obtain a 1.3-fold increase in durability.
1 September 2019 in Journal of Physics: Conference Series
The article discusses some ways to improve the wear resistance of technical coatings on the surfaces of cutting tools. These coatings were formed in two stages: diffusion saturation with nitrogen (nitriding) and the use of (Ti, Cr) N solid coatings through the process of applying a cathode arc discharge plasma. The proposed coating option also includes an additional ion doped layer implanted on the previously nitrated surface of high-speed steel. Such a multi-layer coating significantly increases (2.1–2.4 times) the wear resistance of the cutting tool due to the expansion of the stage of normal wear. The influence of 16 chemical elements and four antifriction materials implanted into the base surface on the wear resistance of a high-speed steel cutter with technical surface coating was investigated.
The paper presents the results of theoretical and experimental research on tribotechnical characteristics: tool wear on the back surface, tool durability period, critical length of the cutting path before blunting, adhesion component of the friction coefficient, contact processes, temperature, and force dependences for the application of innovative nanostructured multilayer composite coatings on a tool for milling of titanium alloys. The proposed thermodynamic model of cutting tool wear allows us to determine the ways by which cutting tool wear intensity decreases and the conditions of increase in cutting tool wear resistance with wear-resistant coatings. A substantial increase in wear resistance of end mills when processing titanium alloys with the use of innovative multilayer nanostructured coatings is established, in particular an improvement of an average of 1.5–2 times. These positive results are related to a significant decrease in temperature–force loading in the cutting zone, a decrease in the friction coefficient (adhesion component), and the phenomenon of adaptation (self-organization) of friction surfaces during cutting by tools with wear-resistant coatings, contributing to the formation of films of various compounds with shielding, protective, and lubricating properties.
This article discusses the specific application features of end mills with Ti-TiN-(Ti,Cr,Al)N, Zr-ZrN-(Zr,Mo,Al)N, and ZrHf-(Zr,Hf)N-(Zr,Hf,Cr,Mo,Al)N multilayer nanocomposite coatings during the machining of the Inconel 718 nickel–chromium alloy. The hardness, fracture resistance during scratch testing, structure, and phase composition of the coatings were studied. The tribological properties of the samples were compared at temperatures of 400–900 °C. Tests were conducted to study the wear resistance of the coated end mills during the milling of the Inconel 718 alloy. The wear mechanism of the end mills was studied. It was found that in comparison with the other coatings, the Zr-ZrN-(Zr,Mo,Al)N coating had the highest hardness and the lowest value of the adhesion component of the coefficient of friction at high temperatures. However, the Zr-ZrN-(Zr,Mo,Al)N coating exhibited good resistance to cracking and oxidation during the milling of the Inconel 718 alloy. Based on the above, the Zr-ZrN-(Zr,Mo,Al)N coating can be considered a good choice as a wear-resistant coating for the end milling of the Inconel 718 alloy.
About Me
Professor Migranov Mars Sharifullovich graduated from Ufa State Aviation Technical University, specializing in "Technology of mechanical engineering, metal-cutting machines and tools". In 2007 he defended his doctoral dissertation and was awarded the degree of Doctor of Technical Sciences. At present he is the chief researcher of the department "High Performance Machining Technologies" of the Moscow State Technological University "STANKIN". At present he reads courses "Innovative technologies of machine-building production"; "Friction and wear in machines"; "Modern machine-building equipment". Scientific and research activity is connected with tribotechnical tests of the process of blade machining by cutting of hard-to-machine materials; development of hardening technology for metal cutting tools; thermodynamic analysis and description of contact processes during cutting; development and research of high-entropy target cathodes for formation of wear-resistant coatings on cutting tools for machining of chromium-nickel and titanium alloys. He is the author of more than 450 articles presented in domestic and international journals and/or conferences, has more than 15 patents of the Russian Federation and certificates of state registration of programs. He was the responsible executor of a number of foreign programs in cooperation with McMaster University (Ontario, Canada), related to the study of tribological characteristics of heavy-loaded high-temperature tribo-conjugations.
Professor Migranov Mars Sharifullovich graduated from Ufa State Aviation Technical University, specializing in "Technology of mechanical engineering, metal-cutting machines and tools". In 2007 he defended his doctoral dissertation and was awarded the degree of Doctor of Technical Sciences. At present he is the chief researcher of the department "High Performance Machining Technologies" of the Moscow State Technological University "STANKIN". At present he reads courses "Innovative technologies of machine-building production"; "Friction and wear in machines"; "Modern machine-building equipment". Scientific and research activity is connected with tribotechnical tests of the process of blade machining by cutting of hard-to-machine materials; development of hardening technology for metal cutting tools; thermodynamic analysis and description of contact processes during cutting; development and research of high-entropy target cathodes for formation of wear-resistant coatings on cutting tools for machining of chromium-nickel and titanium alloys. He is the author of more than 450 articles presented in domestic and international journals and/or conferences, has more than 15 patents of the Russian Federation and certificates of state registration of programs. He was the responsible executor of a number of foreign programs in cooperation with McMaster University (Ontario, Canada), related to the study of tribological characteristics of heavy-loaded high-temperature tribo-conjugations.