Metal deforming – With cutting – By shearing tool-couple
Patent
1993-05-03
1994-05-10
Larson, Lowell A.
Metal deforming
With cutting
By shearing tool-couple
72348, 413 6, B21D 5144
Patent
active
053097491
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 a lower pressure 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 a die center and a high pressure panel punch having a small panel radius and a small clearance therebetween. The peripheral portion is also gripped between a lower die core ring and an upper pressure sleeve which cooperate to form a crown and a depending lip. The center panel is shifted downwardly by the die center against the pressure of the panel punch for forming an inwardly bowed 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 bottoms, reverses and is moving upwardly, a substantially cylindrical panel wall is formed within the nose portion of the die center by the panel punch, and the countersink is formed around the nose portion. The inwardly bowed chuckwall is subsequently formed straight during a seaming operation to produce a more cylindrical panel wall.
REFERENCES:
patent: 4587826 (1986-05-01), Bulso, Jr. et al.
patent: 4637961 (1987-01-01), Bachmann et al.
patent: 4715208 (1987-12-01), Bulso, Jr. et al.
patent: 5042284 (1991-08-01), Stodd et al.
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