Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1975-11-19
1977-04-19
Hunt, Brooks H.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
75211, 241 23, 241DIG37, B22F 100
Patent
active
040186334
ABSTRACT:
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 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 of -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 openings shaped to maximize through-put.
The resultant converted powder is subjected to annealing, powder blending, compaction, and sintering to provide a sintered shape.
REFERENCES:
patent: 2892697 (1959-06-01), Davies et al.
patent: 3072347 (1963-01-01), Dombrowski
patent: 3363846 (1968-01-01), Eck
patent: 3666185 (1972-05-01), Williams
patent: 3804339 (1974-04-01), Laws et al.
patent: 3885744 (1975-05-01), Drage
Ford Motor Company
Hunt Brooks H.
Malleck Joseph W.
Zerschling Keith L.
LandOfFree
Cryogenic metal chip reclamation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cryogenic metal chip reclamation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cryogenic metal chip reclamation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-101200