Metal deforming – With exposure of work to gas – vapor – mist – or modified...
Patent
1976-01-15
1977-08-16
Larson, Lowell A.
Metal deforming
With exposure of work to gas, vapor, mist, or modified...
72 45, 72201, 72366, 75214, 29420, B21B 900
Patent
active
040417425
ABSTRACT:
An apparatus and method for cold working metal powder to produce a metal powder highly suited for consolidation wherein the apparatus comprises a cold rolling mill including a pair of driven rolls mounted within a sealed work chamber for receiving and deforming a closely metered amount of powder. The work chamber is continuously purged with an inert atmosphere to protect the powder from gaseous contaminants and circulating and filter means is provided for removing solid contaminants. To facilitate cold rolling the powder is lubricated prior to passage through the rolls and brushes are provided for cleaning any adhering powder from the surface of the rolls. The resulting cold worked powder particles have a coin, or plate-like, shape and demonstrate desirable properties for hot consolidation, such as, a low incidence of hollow particles and nonmetallic inclusions, the capability of achieving a condition of superplasticity, and an increased tap density of the loose powder.
REFERENCES:
patent: 2222251 (1940-11-01), Calkins et al.
patent: 2689398 (1954-09-01), Gaut et al.
patent: 3041716 (1962-07-01), Herenguel
patent: 3434669 (1969-03-01), Giambattista
patent: 3604237 (1971-09-01), Kawanami et al.
Kelsey-Hayes Company
Larson Lowell A.
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