Plastic article or earthenware shaping or treating: apparatus – Means for molding powdered metal
Patent
1975-10-06
1977-09-13
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Means for molding powdered metal
425408, 425410, 425416, B30B 1102
Patent
active
040478645
ABSTRACT:
An apparatus for compressing powder material into at least partially spherical articles, comprising a die and upper and lower reciprocally movable punches. The die has a center bore through which the lower punch is reciprocable. The wall at the upper part of the die bore is enlarged to form a spherical zone portion of a hemispherical cavity. The end face of the lower punch has a concave shape to form a segment of the hemispherical cavity when the face of the lower punch is flush with the die cavity wall. The lower face of the upper punch defines a hemispherical cavity which mates with the hemispherical cavity of the die. In operation, the bore and die cavity are charged with powder material and the upper punch is brought into engagement with the die. A compaction stroke by the lower punch then forces the powder material into the spherical cavity. The upper punch is then withdrawn and the compacted spherical article is removed from the die. Alternatively, the end face of the lower punch may be flat, convex, or any other appropriate shape to compact partially spherical articles.
REFERENCES:
patent: 1684984 (1928-09-01), Claus
patent: 1979156 (1934-10-01), Hettel
patent: 2893062 (1959-07-01), Penrice
patent: 3255279 (1966-06-01), Smith
patent: 3452121 (1969-06-01), Cochardt et al.
patent: 3775032 (1973-11-01), Smith et al.
Flint, Jr. J. Howard
Wolverine Aluminum Corporation
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