Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1992-02-24
1993-09-21
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 56, 264109, 264320, 419 49, 419 52, 425 78, 4251746, 425406, B29C 4302, B29C 6700
Patent
active
052466388
ABSTRACT:
The present invention is directed generally to apparatus for and improvements in powdered metal consolidation processes, some of which referred to as "electroconsolidation" processes, and more particularly to processes employing specially shaped rams or electrodes and/or other press elements for imparting uniformity of electrical flux and/or pressure to a workpiece.
Some embodiments of the improved process of the present invention contemplate controlling the degree of compaction by providing rams which generally conform to the shape of the preform. Such projections may be provided on the rams to selectively develop at least one zone of relatively high compaction within the die chamber, which results in certain embodiments associated with the electroconsolidation process in release of the major portion of the electrical energy within the zone having a relatively high degree of compaction. Moreover, at least one member of a selected shape may be inserted within the die chamber for modifying the electrical resistivity pattern thereof.
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Theisen Mary Lynn
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