Powder metallurgy processes – Forming articles by uniting randomly associated metal particles – Consolidation of powders
Patent
1988-09-15
1989-08-01
Lechert, Jr., Stephen J.
Powder metallurgy processes
Forming articles by uniting randomly associated metal particles
Consolidation of powders
384279, 384283, 425 78, B22F 100
Patent
active
048531804
ABSTRACT:
A die assembly having a cavity in which powdered metal is compressed with upper and lower punches. A core extends through the lower punch to form the inner wall of a bushing, and a core extension rod having a lateral protrusion that extends into the cavity to form a groove in the upper portion of the bushing. The core and the core extension rod move in concert between positions to receive powder, compress it and moves upward to afford expelling the finishing bushing. One stationary protrusion extends from the die into the cavity to form a groove in the powdered metal along the full length of the completed bushing. Air passage means are used to direct air into the cavity to remove residue powder that may eventually build-up and cause inaccuracies. Also, in the preferred embodiment a powder feeder means is used on a die table to reciprocate between a retracted, inactive position and an extended position to deposit powdered metal into the cavity and later to bump a finished bushing across the table.
REFERENCES:
patent: 2856211 (1958-10-01), Firth
patent: 3648343 (1972-03-01), Haller
patent: 3677583 (1982-07-01), Steinke
patent: 3790374 (1974-02-01), Dedek
patent: 3842646 (1974-10-01), Kuhn
patent: 3982934 (1976-09-01), Wentzell
patent: 4298563 (1981-11-01), De Santis
patent: 4472350 (1984-09-01), Vrano
patent: 4525094 (1985-06-01), Johnson et al.
patent: 4666665 (1987-05-01), Hornsby et al.
Felsman Robert A.
Lechert Jr. Stephen J.
Martin Sprocket & Gear, Inc.
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