Chemical Engineering Science, Vol.53, No.18, 3215-3225, 1998
Die entry pressure drops in paste extrusion
Pressure drops for the extrusion of a perfectly plastic material through smooth-walled dies with various reduction ratios and conical entry angles have been calculated by the large deformation elastic-plastic finite element method. They are found to agree well with extrusion pressures obtained from slipline field analyses for plane strain problems, and lie within the limits set by upper- and lower-bound solutions in axisymmetric cases. The results for axisymmetric dies are compared with the die entry pressure drop term in the Benbow-Bridgwater equation, used to describe the flow of pastes in a ram extruder.