Aliieva L. Development of scientific foundations and elaboration of resource-saving processes of volumetric shaping on the basis of combined deformation methods

Object of research – technological processes and equipment of volumetric shaping. The purpose of the study is to increase the efficiency of volumetric deformation processes based on the development of scientific foundations, the creation and application of new technological methods for combined deformation and the development of methods for designing resource-saving technological processes and equipment. Research methods: the upper bound energy method, the finite element method, coordinate grids, the phenomenological theory of destruction, the methods of macro and microstructural studies, the measurement of force parameters and mathematical statistics. Theoretical and practical results – the influence of the stress state parameters on the deformability of the metal is established; a method is developed for modeling the processes of axisymmetric plastic deformation using kinematic modules; a method is developed for calculating the restoration of metal ductility during deformation with intermediate anneals; new methods of combined deformation with various parts are proposed; new technological processes of combined metal forging have been introduced. Novelty – for the first time based on models of combined and sequential radial-longitudinal extrusion processes, a complex of dependencies was obtained to evaluate the force regime and form the parts by new deformation schemes; the fact of a significant effect on the plasticity of the change rate in the stress state index, which is shown by the curvature of the strain path, is established; the regularities of the change in the force regime of the extrusion process with hollow parts, including the forces of deformation, ejection and removal of parts, have been further developed, which allowed us to justify the new principle of tool loading, which consists in removing the part from the die together with the punch and then removing the part from the punch outside the matrix. Degree of introduction – new echnological processes and equipment for volumetric shaping, technological modes of deformation. The sphere of use – transport, heavy and power engineering enterprises, branch research institutes.