Hrudkina N. Development of energy methods for the analysis of technological modes and improvement the processes of precise volumetric stamping by extrusion.

Object of research –precision forging extrusion process. The aim of the dissertation is to increase the efficiency of precision volumetric extrusion stamping processes based on the development of scientific foundations with energy analysis methods and the development of methods for designing technological processes and equipment. Methods of research - power balance energy method, the finite element method, the method of dividing grids, the methods of physical modelling and strain gauging to measure technological forces and shaping. Theoretical and practical results – developed kinematic modules with curvilinear boundaries to take into account the interface of the metal and the design features of the tool in the complex elements form of the transition sections, installed the possibility of using the metal flow in the longitudinal direction as an optimization parameter, developed software for determining the power mode, shaping and defect formation in the processes of combined extrusion. Novelty – developed a set of mathematical models in extrusion processes from the calculation of shaping, power mode and determining the optimal configuration of the tool with the presence of design features in the form of chamfers and rounding; possibilities of using the metal flow velocity in the longitudinal direction as an optimization parameter are substantiated, which allowed to obtain engineering formulas for calculating the increments of the semi-finished product. Introduction – new technological processes, technical solutions and equipment for obtaining complex profiled parts with flange and branch and recommendations regarding for the elimination of the possible formation in shape defects, were tested and accepted for implementation in production. Scope - metal forming, precision forging extrusion.