Tube Drawing with Tilted and Shifted Die

Abstract

In order to reduce tubes dimensions, improve their surface finish and obtain requested mechanical properties, tube drawing is one of the most effective and flexible methods used since centuries. Many parameters influence the results obtained such as tool geometry, friction, drawing force, or the amount of thickness reduction. A lot of investigations have been done studying these effects. A significant effect on the local material’s flow is given by abandoning the pass line during drawing leading to an asymmetric deformation over the circumference of the tube. Tube drawing with a tilted die shows a considerable variation in eccentricity in drawn tubes. A similar strong effect is given by shifting the dies – a guiding die and a die for reduction. A third, very effective possibility is the use of local heating, therewith influencing the flow conditions locally. Using these parameters in a controlled way makes possible to influence eccentricity precisely.