Apparatus and method for processing powder metallurgy tubing

Details Apparatus and method for processing powder metallurgy tubing Apparatus and method for processing powder metallurgy tubing

1986-04-11

1988-02-02

Larson, Lowell A.

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

72370, 72398, 72420, B21C 3706

Patent

active

047222093

ABSTRACT:
An apparatus (10) and method for consolidating and sintering a tube preform (12) previously fabricated by powder metallurgical techniques. A plurality of forming dies (22, 24) and movable mandrels (30, 32) cooperate to form tube consolidation zone (58,60). One-way tube gripping means (42) permit the tube (12) to progress through the apparatus (10) by the retraction of the mandrels (30, 32) while preventing the tube (12) from retreating back into the zone (58) when the mandrel (30, 32) is advanced. Heating coils (18A, 18B and 18C) heat the tube (12) to sinter it and cause it to expand clear of the mandrels (30, 32). The tube (12) is reduced in diameter and consolidated to greater than 90% theoretical density.

REFERENCES:
patent: 2780118 (1957-02-01), Kritscher
patent: 2902714 (1959-09-01), Johnson
patent: 3447230 (1969-06-01), Bargainnier et al.
patent: 4435359 (1984-03-01), Eiselstein et al.

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