Borovik P. Development of theoretic foundations and improvement of technology and equipment of separation operations processes in rolling production

The dissertation is aimed at solving the current scientific and practical problem of improving technical and economic indicators of metal separation processes based on the development of scientific and practical bases of application of the finite element method to solve combined problems of elasticity, plasticity and fracture taking into account changing process conditions. Analytical review revealed ways and directions of further development of separation operations and equipment, by high accuracy of computation the shear resistance, improving technological modes and tools, improving quality based on the analysis of experimental data and finite element simulation. The types of finite elements, the rules of mesh size control in the separation zone, the process of crack formation and growth, the influence of shears stiffness and thermodynamic processes are established. Models of mechanical properties of hot and cold material, and also relative penetration to fracture at cold shearing are developed. The influence of the geometry of shearing tools on the force and quality of cutting with chevron knives of sheet metal and shaped knives of square billet is determined. The sheet speed in the disc knives is determined, which allows to develop technological schemes for combining shearing and straightening processes. The understanding of separation processes is expanded. Developed, improved and supplemented methods and calcuting software, as well as measures to expand the range and improve the quality of metal rolling shearing operations. Keywords: separation operations, shearing on shears, mathematical simulation, finite element method, model of mechanical properties, stress-strain state.