ABSTRACT
Figure 37 Increase in extrusion pressure for pure lead with changes in the shape factor of the cross section [324].
The unifonn wall thickness of the pipe depends to a great degree on the shape of the mandrel and its coaxial position in the container. The loss of material due to variable sizes of the extrusion residue can be reduced by effecting the piercing of the solid lead billet and extrusion to pipe in two separate operations [2].
