Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate
2005-03-01
2005-03-01
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
C419S036000, C419S037000, C425S078000
Reexamination Certificate
active
06861028
ABSTRACT:
A manufacturing method for high-density iron-based powder compacts is disclosed. The temperature of the die is adjusted at ordinary temperature or at a predetermined temperature by preheating. A lubricant for die lubrication prepared by mixing at least two different lubricants having melting points higher than a predetermined temperature of the compaction pressure is sprayed at the upper part of the die and is introduced into the die and adhered by electrification to the surface of the die. The resulting die is filled with an iron-based mixed powder including a lubricant and molding is performed at ordinary temperature or at a temperature raised by heating. The at least two different lubricants having melting points higher than the predetermined temperature of the compaction pressure are preferably at least two materials selected from at least one of the following groups: metallic soaps, amide-based waxes, polyamides, polyethylenes, polypropylenes, polymers comprised of acrylic acid esters, polymers having methacrylic acid ester, plastics including fluorine and lubricants having layered crystal structures.
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Bocksteigel et al., “The Influence of Lubrication, Die Material and Tool Design Upon Die-Wear in the Compacting of Iron Powders,”Processes. Proceedings of the 1970 International Powder Metallurgy Conference, vol. 4, pp 87-114, New York.
Ozaki Yukiko
Uenosono Satoshi
Unami Shigeru
Jenkins Daniel
Kawasaki Steel Corporation
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