Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Patent
1995-04-25
1996-04-02
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
419 36, B22F 316
Patent
active
055037950
ABSTRACT:
A process is disclosed for forming a pressed metal part in which a preform is inserted into a pressed metal mold. The mold is then filled with powdered metal. The powdered metal and preform are compacted to create a compacted metal part wherein the preform defines an adjacent volume next to the compacted metal part. The compacted metal part is ejected from the mold and sintered to create a sintered metal part. The preform is removed by the sintering step in such a way that the adjacent volume becomes a void region. The preform can be formed of copper so that, upon sintering, the preform is removed from the sintered metal part through infiltration. Alternatively, the preform can be formed of zinc so that, upon sintering, the preform is vaporized and thereby removed from the sintered metal part. The void region created by the removal of the preform can be an undercut, a taper, an annular groove, a thread or an internal cavity. In this way, the present invention eliminates the need for machining such surfaces as has been necessary using previous compaction methods.
REFERENCES:
patent: Re28301 (1975-01-01), Havel
patent: 3554874 (1971-01-01), Mattia
patent: 3622313 (1971-11-01), Havel
patent: 3723585 (1973-03-01), Nussbaum
patent: 3841870 (1974-10-01), Hamjian
patent: 3893852 (1975-07-01), Bergman et al.
patent: 4065303 (1977-12-01), Seilstorfer et al.
Jenkins Daniel
Pennsylvania Pressed Metals, Inc.
Walsh Donald P.
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