Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1993-05-25
1994-11-08
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72465, 294211, B21D 3908
Patent
active
053616170
ABSTRACT:
The device having a die formed by a cushion (2) composed of an elastically yieldable material, such as for example an elastomer, disposed in a retaining box (1), a mechanism for predrawing a sheet blank (6), constituted by an outer slide carrying an upper blank holder (4a), a mechanism for finally drawing said sheet blank (6), constituted by a central slide acting on a plunger (5), and a first mechanism (10) for absorbing excess volume of the cushion (2) relative to the volume determined by the surface of the finished part to be obtained in the course of the final drawing of the part. The device further comprises at least one second mechanism (20) for compensating for the excess volume of the cushion (2) due to variations in physical characteristics of the material of the cushion.
REFERENCES:
patent: 4770015 (1988-09-01), De Smet
patent: 4833903 (1989-05-01), De Smet
patent: 5081859 (1992-01-01), De Smet
Isoform
Jones David
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