Extrusion can be cold or hot, depending on the alloy and the method used. In hot extrusion, the billet is preheated to facilitate plastic defor-mation. Classification of Extrusion Processes The two basic types of extrusion are direct and indirect, which are commonly used in aluminum industries as shown in Fig. 1 and 6. Solid
mm pin barrel cold feed extruder, with the mold attached is shown in Figure 2. The temperature set up in the extruder was as follows: screw 65 8 C,