B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
241/141
B22F 1/00 (2006.01) B02C 23/00 (2006.01) B22F 8/00 (2006.01) B22F 9/04 (2006.01)
Patent
CA 1087146
ABSTRACT OF THE DISCLOSURE A method of converting scrap metal to a powder suitable for making sinterable shapes is disclosed. Scrap metal equivalent to machine turnings, is subjected to a two-cycle process which graduates the conversion of turnings to powder. The scrap metal, in the first cycle, is cooled to a temperature below the ductile-brittle transition point for said metal and fragmented by impact to a particle size of -1/4 inch. In the second cycle, the fragmented pieces are again cooled to below the ductile- brittle transition temperature and comminuted to a fine powder for -30 mesh. During each cycle, a cryogenic cooling medium is injected into the metal collection both at the entrance to fragmenting or comminuting apparatus as well as into a circulating mass of the metal within the apparatus. Screens are employed to classify the output of each apparatus and each have screen opening shaped to maximize through-put. The resultant converted powder is subjected to annealing, powder blending, compaction, and sintering to provide a sintered shape.
253025
Ford Motor Company Of Canada Limited
Sim & Mcburney
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