Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1989-12-27
1992-01-21
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
294211, 72465, B21D 2210, B21D 2600
Patent
active
050818597
ABSTRACT:
Pressing sheet material with a device comprising a cushion (6) composed of an elastic material, comprising disposing a sheet blank (3) to be formed on a support constituting a lower peripheral blank holder (2a), applying an upper blank holder (1a) on the peripheral portion of the sheet blank (3) for preforming the blank, then applying a punch (4) on the central portion of the sheet blank (3) for effecting the final forming, wherein, in the course of the final forming, the excess volume of the elastic cushion (6), produced by the application of the punch (4), relative to the volume determined by the surface area of the finished part to be obtained, is absorbed.
REFERENCES:
patent: 2719500 (1955-10-01), Kraybill
patent: 2783728 (1957-03-01), Hoffmann
patent: 3552165 (1971-01-01), Taylor
patent: 4770015 (1988-09-01), De Smet
patent: 4833903 (1989-05-01), De Smet
"Adiprene.RTM. Urethane Rubber", DuPont, Nov. 1963, Tool and Manufacturing Engineer, vol. 51.
Isoform
Jones David
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