Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1982-02-23
1983-12-06
Hunt, Brooks H.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428550, 428565, 164412, 264113, 419 2, 419 6, 419 7, 419 10, 425 78, B22F 702, B22F 316, B32B 702, B32B 3120
Patent
active
044194137
ABSTRACT:
A powder compression molding method for producing a multilayer powder compression molded article having a plurality of different material layers disposed in a compression direction utilizes relative movements between an upper punch, a lower punch, a die having a step formed therein, and two feed shoes. The powder compression molded article thus formed requires a reduced amount of a special layer. The powder compression molding method includes forming a first space by moving the die relative to the lower punch, introducing a first powder into the first space through a first feed shoe, lowering the lower punch relative to the die to form a second space so that an upper surface of the first powder on the step of the die and on the lower punch has a nonuniform height, introducing a second powder into the second space, and moving the upper punch towards the lower punch to compress the first and second powders.
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Abstract, Japanese Patent Application Publication 54-23810.
Hunt Brooks H.
Nippon Piston Ring Co. Ltd.
Thexton Matthew A.
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