Abstract
The work objective. To increase by 2-3 times the life of replaceable carbide inserts when turning specialized hard-to-machine stainless steels, The problem to which the paper is devoted. To identify some of the most rational new coatings for carbide tools designed for turning specialized stainless steels.
 Research methods. The method of simulation modelling is applied for predictive design of a carbide tool with coatings.
 The novelty of the work. The scientific novelty of the research consists in the development of scientific principles and innovative technologies based on plasma coating processes by condensation with ion bombardment (CIB) with the prediction of adaptive response to external influences for the purpose of application in treatment of hard-to-machine stainless steels. The results of the study. A sequence of actions (methodology) is developed to design coatings for turning tools under the specified conditions of their operation. A number of coatings are proposed that provide an increase in the tool life by two times or more to wear 0.5 mm on the back surface of the tool. Regression (polynomial) equations are developed that characterize the dependence of the wear value of the tool on the time of its operation when turning these stainless steels.
 Conclusion. Scientific principles and innovative technologies are developed based on plasma coating processes by condensation with ion bombardment (CIB) with prediction of adaptive response to external influences for the purpose of application in treatment of hard-to-machine stainless steels. This made it possible to develop recommendations that ensure an increase in the performance of domestic standard carbide tools by 2-4 times over the period of operation up to 0.5 mm wear, the possibility of choosing the most rational tool materials for the specified or expected conditions of their operation, optimizing the parameters of the cutting mode, increasing treatment productivity without reducing the quality of the treated surface, the possibility to order the necessary cutting tool reasonably. Methods for designing new tools for the specified or desired conditions of their operation are developed. They provide to control the tool operability to ensure its necessary level, desired quality of the treated surface and the necessary treatment performance.
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