Backward extrusion process for inner profiles

摘要

A process of producing an inner profile (18)in a tube or hollow profile (11) includes inserting the tube or hollow profile (11) into a supporting sleeve (12), with a first tube end (19) being axially supported; placing a pressure-loaded annular die 16 on to the other tube end (20); pressing a forming die (15) with an outer profile into the tube or hollow profile (11) from the latter tube end (20) for producing the inner profile (18); allowing a return of the annular die (16) under a pressure load in the opposite direction of that of pressing in the forming die (15).