Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1995-12-04
1997-06-03
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72347, B21D 2200, B21D 2221
Patent
active
056343663
ABSTRACT:
A sheet of metal is blanked by an annular blank die to form a disk, and a peripheral portion of the disk is gripped between the blank die and an air pressurized lower sleeve. The peripheral portion is shifted downwardly relative to a center portion of the disk to start the forming of a center panel within the disk between an annular nose portion of an air pressurized die center and an air pressurized panel punch. The peripheral portion is also gripped between an air pressurized lower die core ring and an air pressurized upper sleeve which cooperate to form a crown and a depending lip. The center panel is shifted downwardly by the die center against the panel punch for forming a chuckwall against the die core ring and to start a countersink by wrapping the metal around the nose portion of the die center. After the die center and upper sleeve bottom and are moving upwardly, a substantially cylindrical panel wall is formed between the nose portion of the die center and the panel punch, and the countersink is precisely formed around the nose portion.
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Butler Rodney A.
Larson Lowell A.
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