Sabol S. Cold extrusion of hollow products of steels in conditions of application of straining forces to the metal blanks

Dissertation is devoted to increase the efficiency of processes of cold extrusion of hollow products based on working out and application of technical tools for extrusion with strain that provide reduction of energy and steel in production and receipt of products with forecasted and required quality. There is worked out the methodology of theoretical analysis of straining processes of hollow products with stepped external surface in conditions of application of straining forces to the metal blanks while using the method of terminated elements and method of power balance that respectively allows by means of modeling find out the influence of straining forces on forcing modes, division of specific on the straining instrument, regularity of metal shape change and to fulfill engineering calculations of the parameters in receiving products with minimal forces of straining and products of forecasted quality. In theoretic way there are identified the amounts of forces reduction of straining and precise division of specific forces while cold extrusion of hollow products with different stages of straining and angle of punch cone. There are disclosed amounts of consolidation and level of resources usage for ductility of deformed metal. Received results were proved by sufficient experimental examination and industrial approbation. Received results gave possibility to implement new technological schemes and methodologies of its calculation that essentially widens features of cold extrusion of hollow products of heavy-deformed steel and reduces energy costs.