DEVELOPMENT OF A PROCESS FOR PNEUMATIC EXTRUSION OF METALS.
Final rept. 1 Dec 66-1 Feb 69,
IIT RESEARCH INST CHICAGO ILL
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Pneumatic extrusion of metals by means of high pressure nitrogen gas was demonstrated. The advantages of pneumatic extrusion over hydrostatic extrusion are 1 a more uniform extrusion force, 2 faster extrusion rates, 3 elimination of high pressure combustible vapor, 4 the ability to maintain a cold vessel wall during elevated temperature extrusion. Both pneumatic and hydrostatic extrusion result in a considerable reduction in die friction when compared to conventional mechanical extrusion indeed at extrusion pressures above 70,000 psi essentially equivalent frictional characteristics exist in the two fluid extrusion systems. Pneumatic extrusion does pose difficulties in extrusion catching and blast shielding. A study is described wherein pneumatic extrusion was used for the extrusion of aluminum and mild steel at pressures to 140,000 psi. Author
- Fabrication Metallurgy