Powder metallurgy processes – Forming articles by uniting randomly associated metal particles – Consolidation of powders
Patent
1994-03-23
1995-10-03
Theisen, Mary Lynn
Powder metallurgy processes
Forming articles by uniting randomly associated metal particles
Consolidation of powders
419 61, B22F 303
Patent
active
054550025
ABSTRACT:
A plastic working method for making a holed metal part. A holed blank with a through hole is placed at the center in a die member which has a die and a container continuing to the die. The die is pushed toward a punch, inserting into the through hole a first portion of a mandrel which has cross sections with at least two different cross-sectional areas. The blank is compressed by a counter punch fitting with the container and a punch pressing the die end face of the die member toward the counter punch to cause the blank plasticly to flow into a space formed between the die hole of the die and the first portion of the mandrel and while applying a compressive force to the blank by the punch and the counter punch, pulling out the first portion of the mandrel out of the blank through hole while inserting a further portion of the mandrel into the through hole so as plastically to flow the blank into a gap between the first portion of the mandrel and the through hole. Other embodiments of the method are also disclosed.
REFERENCES:
patent: 2357407 (1944-09-01), Kurtz
patent: 3185753 (1965-05-01), Haley
patent: 4853180 (1989-08-01), Howard
patent: 5043111 (1991-08-01), Hinzmann et al.
patent: 5122319 (1992-06-01), Watanabe et al.
Kobayashi Kazuto
Nakano Takashi
Suzuki Toshio
Aida Engineering Ltd.
Theisen Mary Lynn
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