Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1996-08-09
1998-06-23
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
7245313, B21D 5126
Patent
active
057689326
ABSTRACT:
A forming apparatus uses counteracting, hydraulically coupled pistons to form a dome structure in the bottom panel of the container, such as a beverage can. A pressure ring is on one piston, and a doming die is on the other piston. The pistons are received in a piston housing that also provides a primary fluid reservoir so that, when one piston moves in one direction to displace fluid, the displaced fluid moves the other piston in the opposite direction. The pistons are coaxial and one is received in the other. Return springs are provided to bias the pistons into a desired orientation. A secondary reservoir may be provided to receive overflow fluid. Here, a first one-way valve sets a threshold so that fluid will flow into the secondary reservoir when the pressure in the primary reservoir exceeds the threshold. A second one-way valve permits fluid to return to the primary reservoir when the return springs move the pistons to a starting orientation. The secondary reservoir also permits the pistons to have a limit stop for countermovement at which point they undergo common movement with fluid being overflowed into the secondary reservoir.
REFERENCES:
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patent: 4289014 (1981-09-01), Maeder et al.
patent: 4589270 (1986-05-01), Lee, Jr. et al.
patent: 4620434 (1986-11-01), Pulciano et al.
patent: 4930330 (1990-06-01), Weishalla
patent: 5016463 (1991-05-01), Johansson et al.
Henson Michael R.
Larson Lowell A.
Martin Timothy J.
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