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US 6,190,605 B1Granted
Dry die wall lubrication
AssigneeZenith Sintered Products, Inc.
InventorsTerry M. Cadle, Joel H. Mandel, Paul R. Roskopf
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Abstract
A method for high density long fill compaction of metallic powders uses a precisely temperature controlled mold and a dry sprayed lubricant which has the characteristic of softening on contact with the mold and smearing on the mold wall during compaction, yet on ejection not causing powder adherence.
Claims6
A method of compacting metal powder in a compaction mold to prepare a metal powder compact for sintering, comprising:
- controlling the surface temperature of walls of said mold to be at a temperature which is between a softening temperature and a melting temperature of a lubricant;
- applying said lubricant to said walls;
- charging said mold with powder metal, with said powder metal contacting said lubricant applied to said walls;
- compacting said powder metal in said mold while maintaining the surface temperature of said walls of said mold at said temperature which is between a softening temperature and a melting temperature of said lubricant;
- and
- ejecting said compacted powder metal from said mold.
3 more elements
Dependencies are inferred from the claim text.