Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Reexamination Certificate
1999-08-24
2001-09-11
Mai, Ngoclan (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
C419S035000, C419S048000
Reexamination Certificate
active
06287513
ABSTRACT:
TECHNICAL FIELD
The invention is concerned with the compaction of powder metal, in particular control of the processing parameters in the compaction of powder metal.
BACKGROUND OF THE INVENTION
There is a need to produce higher density powder metal parts. There are ways of coating or adding thin lubricants or polymer coatings as interfaces between the particles which decreases the internal friction and stresses created during compaction.
Some problems have arisen with different types of heating devices for powder metal. When heated to a temperature of about 300 degrees Fahrenheit before loading the material into the die cavity, the powder may become tacky and coagulate. Typical powder delivery systems have used mechanical devices; these systems have some drawbacks. Mechanical devices will cause some coagulating or snowballing of the powder due to tacky lube being rolled over and over. Air fluid beds will segregate the material due to sizes, weight variations in particles. Pleated hoses will allow material to gather in pleats and block the hose.
Since the usual production method requires accurate gravity controlled filling of the die cavity from the delivery shoe, the present invention designs around these known problems.
SUMMARY OF THE INVENTION
Described is a method of shaping powdered metal parts comprising providing powdered metal from a source, applying a heated fugitive coating to the powdered metal, passing the powdered metal through a heated tube from a supply thereof to the die for the molding of the part, monitoring the temperature of the heated tube during the passage of the powdered metal there though, heating and monitoring the temperature of the die, heating and monitoring the temperature of a punch die, and after filling the die with coated powdered metal, compacting the powdered metal by applying pressure from the punch die to the filled die, thereby compacting the metal to a desired shape.
REFERENCES:
patent: 4834800 (1989-05-01), Semel
patent: 5271891 (1993-12-01), Gay et al.
patent: 5567746 (1996-10-01), Gay
patent: 5591373 (1997-01-01), Ward et al.
patent: 5595609 (1997-01-01), Gay
patent: 5637402 (1997-06-01), Gay
Beard Bradley D.
Clase Scott M.
Grady Peggy
Grady Thomas G.
Stuart Tom L.
Delphi Technologies Inc.
Dobrowitsky Margaret A.
Grady Peggy
Mai Ngoclan
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