Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1989-02-02
1990-11-20
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72377, B21K 304
Patent
active
049708872
ABSTRACT:
A method and apparatus for upsetting forged bars to form compressor vane blanks are disclosed which utilize a two-stage upsetting process. In a first stage, the rough forged bar is placed in a first die having a first enlarged cross sectional area such that the end of the bar to be upset extends into the enlarged cross sectional area of the die. The enlarged cross sectional area is shaped so as to have at least three lines of contact with the bar segment during lateral expansion of the bar. In a second upsetting stage, the expanded bar is removed from the first die and inserted into a second die, also defining an enlarged cross sectional area portion such that the expanded portion of the bar extends into the enlarged cross sectional area of the second die. The second enlarged cross sectional area has a cross sectional shape so as to accommodate the previously enlarged portion of the bar such that at least one line of contact is maintained between the bar and the die as the bar laterally expands.
REFERENCES:
patent: 3154849 (1964-11-01), Dolch, Jr.
patent: 3392569 (1968-07-01), Ruoff et al.
patent: 3641801 (1972-02-01), Lachaussee et al.
patent: 4484464 (1874-11-01), Nihei et al.
Larson Lowell A.
Societe Nationale d'Etude et de Construction de Moteurs d'Aviati
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