ANALYSIS OF AXISYMMETRICAL TUBE EXTRUSION

A comprehensive investigation of an axisymmetric steady-state tube ext rusion through a streamlined die is carried out by the finite element method (FEM) to study the influence of process variables on tool desig n and final product quality for a strain hardening material. The proce ss variables considered are: the reduction in area; coefficient of fri ction; mandrel radius; die-length; the hardening capacity of the mater ial. The extrusion parameters studied are: the extrusion pressure; die pressure; mandrel pressure; hydrostatic stress distribution; strain-r ate distribution; strain distribution. The mixed (pressure-velocity) f ormulation is used along with the Householder method to solve the resu lting ill-conditioned algebraic equations. The extrusion pressure pred icted by the present model is in reasonably good agreement with the pu blished experimental results. The trends predicted for other parameter s also conform with the published results. Copyright (C) 1996.