The study is concerned with an analysis on the hydrofilm hydrostatic extrusion through conical dies.
The upper bound method is adopted for the analysis of metal deformation in connection with hydrodynamic lubrication theory for the lubricant in order to determine the extrusion pressure for some variables such as reduction of area, die cone angle. In the upper bound method, a kinematically admissible velocity field is found by assuming proper streamlines and applying the flow function concept to the region of plastic deformation. The effect of work hardening is incorporated approximately by calculating the strains at the exit of the die.
The experiments are carried out with the commercially pure aluminium for some chosen variables at the room temperature. It is shown that the theoretical predictions are in reasonably good agreement with the experimental observations.
