Creation of internal protrusion in pipe billet by radial extrusion. Relevance and statement of problem. Part 1

The relevance of conducting the study in order to determine the main technological parameters of the process of internal radial extrusion of a pipe billet, which are necessary for the successful design of this operation, is substantiated. The mechanical-mathematical problem to be solved is formulated and a complete system of necessary initial equations is given. Formulas have been obtained that relate the current geometric parameters of the extruded billet to the stroke of a punch.