Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1998-10-28
2000-02-01
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
29894362, 72358, B21K 140
Patent
active
060189770
ABSTRACT:
A crude work having a cylindrical boss formed integrally with a base plate is processed to a final product by a press work without using additional machining. An inner diameter of the boss is enlarged by a punch, and at the same time an outer diameter of the boss is shrunk by an outer die, while the work is supported on a cushion ring to which a force against the movement of the punch and the outer die is applied. Some of the material constituting the cylindrical boss is squeezed, and a bulge is formed at a foot of the cylindrical boss out of the material squeezed. Since the bulge is fromed in a confined space in the die structure, no crack or defect develops in or on the bulge. The bulge is further compressed by a press work to form a flat flange out of the bulge. The cylindrical boss having the flange formed integrally therewith is used as a center boss for holding a bearing of a rotary machine.
REFERENCES:
patent: 2027922 (1936-01-01), McNaught
patent: 5517844 (1996-05-01), Yuan
Nakano et al.; "Flow Control Forming in Sheet Metal (FCF Method)"; Die Tehnology, vol. 8, Jul. 1993 pp. 118-119.
Kanno Kazunobu
Kato Yoshihiko
Obata Kenji
Asmo Co. Ltd.
Larson Lowell A.
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