Application of Hot Extrusion:
 
Aluminium, copper with their alloys is successfully used to manufacture products using hot extrusion process. Electrical wires, bars and tubes are some of the items produced.
 
Cold Extrusion:
 
Cold Extrusion takes place at room temperature or slightly elevates temperatures. This process is useful for withstanding the stresses created by extrusion.
 
The advantages of Cold Extrusion are:
 
No Oxidation process
Good Mechanical properties provided the temperatures created are below the re-crystallization temperature
Good Surface Finish
 
Application of Cold Extrusion:
 
Examples of the metals that can be extruded are copper, lead, tin, aluminum alloys, titanium, molybdenum, vanadium, steel. Which are used to make parts like collapsible tubes, gear blanks, aluminum

Process

Extrusion of a round blank through a die.
The process begins by heating the stock material. It is then loaded into the container in the press. A dummy block is placed behind it where the ram then presses on the material to push it out of the die. Afterwards the extrusion is stretched in order to straighten it. If better properties are required then it may be heat treated or cold worked.