Page 82 - Module DMV20173

4.0 BULK DEFORMATION PROCESSES

(a)

(b)
Figure 4.17 Indirect (backward) extrusion for producing solid (a) and hollow object (b)

c) HYDROSTATICS EXTRUSION PROCESSES

1. In this process, the chamber is filled with a fluid that transmits the pressure to the

billet, which is then extruded through the die as shown in Figure 4.18.
2. The billet is smaller in the diameter than a chamber and the pressure is transmitted
to the billet by the ram.

3. Unlike in direct extrusion, there is no friction to overcome along the container walls
because the billet is stationary with respect to the container.

BPLK 114 DMV 20173