Rolling and burnishing of internal threads Part I. The design of tools

摘要

Rolling of internal threads with the use of rolling heads gives products of very high quality. Yet, the use of this technology is limited to made fine-pitch threads with relatively large nominal diameters (larger than 50 mm) in low carbon steels and copper and aluminum alloys, because the main reason is the difficulty in designing and making sufficiently rigid and durable tools. Our design solutions of the rolling heads described in the article enable plastic forming of internal threads starting from the nominal diameter of 24 mm and are protected by patents. Owing to the use of replaceable parts it is possible to roll with one tool the internal threads of similar nominal diameters but different pitches and profiles.