This thesis describes modern approaches to expanding the technological capabilities of the process of diamond grinding of superhard materials. The aim of the study is to improve the process of diamond grinding of superhard materials by controlling contact stresses. The modern provisions of the theory of materials processing by cutting, the theory of electrochemical processing, classical mechanics, and elements of the theory of mathematical processing of experimental data were used to solve the tasks of the dissertation research. The concept of 3D modelling based on the finite element method was used to study the stress-strain state of the grinding system "synthetic diamond polycrystal-diamond grain-metal phase-bonded wheel" in relation to the processes of grinding synthetic diamond polycrystal with diamond wheels on organic and metal bonds. When using microscopic studies, a digital camera ToupCam UCMOS01300KPA was used to provide visualisation of the objects under consideration. Experimental studies were carried out using generally accepted and proposed original methods on a special stand based on a universal sharpening machine, which, after modernisation, could be converted into a surface grinding machine with a vertical spindle. The study used theoretical and applied statistics, as well as SolidWorks, KOMPAS, CorelDRAW, Visio, Maple, ToupView, Statistica, Microsoft Office and its Microsoft Office Excel application. The introduction substantiates the relevance of the research objectives, presents the scientific novelty and formulates the practical significance of the results. The first chapter of the thesis analyses the current global trends that have emerged in recent years in the field of production, application and processing methods of synthetic polycrystalline diamond. Based on the analysis of information sources, the author identified issues that remain unresolved in this subject area. Based on the analysis, a working hypothesis was put forward, the essence of which is the possibility of increasing the efficiency of synthetic polycrystalline diamond processing by improving diamond grinding methods. The unifying idea of the presented work is a comprehensive theoretical and experimental study of the physical and technological features of the processes of grinding synthetic diamond polycrystals, establishing on this basis the basic prerequisites for the implementation of the conditions for forced self-sharpening of diamond grains and their practical implementation in the proposed grinding methods. The second section describes the general methodology of the research, as well as data on a number of private methods. Among them are a number of those recognised as inventions. They are used to systematise the methods of controlling the linear wear of a wheel and linear part removal. Data on the mathematical processing of experimental research results are presented, etc. The third section presents the results of 3D modelling of the stress-strain state of the grinding system "synthetic diamond polycrystal - diamond grain - metal phase - bonded wheel", the purpose of which is to clarify the mechanism of self-sharpening of diamond wheels as a basis for developing proposals for improving the existing methods of grinding synthetic diamond polycrystal with diamond wheels with metal and organic bonds. The fourth section presents the results of theoretical and experimental studies on improving the combined process of grinding synthetic polycrystalline diamond with diamond wheels on metal bonds, which includes continuous electrochemical removal of bonds in an autonomous zone and simultaneous introduction of low-frequency mechanical vibrations into the processing zone as the main components of contact stress control and, consequently, the output indicators of the processing process. For the first time, such a complex factor as a force impulse is used, which in this case is the result of the simultaneous manifestation of such process parameters as the mass of the additional load and the amplitude of mechanical vibrations. The influence of machining conditions on the technological parameters of the grinding process has been determined. The fifth section presents data on practical developments aimed at improving the existing methods of grinding synthetic polycrystals of diamond. In particular, new physical criteria such as the effective component of the tangential cutting force and the effective grinding coefficient were proposed for the first time based on the use of the adaptation phenomenon. With regard to the conditions of high contact stresses typical for the case of grinding with diamond wheels on organic bonds and the established mechanism of their self-sharpening, improved grinding methods have been proposed that provide an increase in the efficiency of processing synthetic polycrystals of diamond.
