Extrusion of axi-symmetric tubes from hollow and solid circular billets: ageneralised slab method of analysis and some experiments

To analyse the mechanics of extrusion of an axi-symmetric tube starting fro m either a hollow or a solid circular billet, a generalised analytical appr oach based on the slab method of analysis is developed for a somewhat gener al case of tube extrusion through a general profile-shaped die and over a g eneral profile-shaped mandrel. The results of mean extrusion pressures obta ined from the theoretical analysis for the various die-mandrel combinations are compared with the experimental investigation carried out on a model ma terial and with the work of other authors. These show reasonably good agree ments. (C) 2001 Elsevier Science Ltd. All rights reserved.