Nikolaj P. Scientific bases of complex thermofrictional and mechanical machining of parts, taking into account oscillation in the technological system of machine-tool

The important problem of creation of scientific bases of complex thermofrictional and mechanical treatment of parts is scientifically grounded and solved in this dissertation work. The main idea of the work is the use of vibration processes to improve the thermofrictional machining of parts. This is realized by using a special dynamic devices such as vibration table for installation of parts and special tools. The workings processes of thermofrictional machining are studied in the dissertation. It is shown that the main heat emission occurs in the thin layer of molten metal with significant velocity gradients. The regularities of the heat removing from the cutting zone with the anisotropy of the thermal properties of the workpiece are grounded. The power factors of process and tool wear are defined. The suggestions on diminishing of the built-up edge are proposed. The mathematical modeling of process of machining is conducted taking into account vibrations in the technological system of machine-tool. The results of mathematical modeling are complemented by the complex measuring of vibration characteristics. The quality of surface is examined at the different process stages of complex machining. Measurements of the corrugated surface are conducted and its spectral analysis is executed. The methods for forecasting parameters of discontinuous flat surface are developed. The features of the chemical composition of the surface, residual stresses in the surface layer and change of the hardness at depth are defined. The technological processes of manufacturing of machine parts with special properties are proposed for the implementation. As a result of the executed research the scientific bases of complex thermofrictional and mechanical machining of tools which take into account oscillation in the technological system of machine-tool are developed.