Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1976-06-17
1978-05-23
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72379, 72DIG8, B21D 2200
Patent
active
040903893
ABSTRACT:
A method of drape drawing a shadow mask from a foraminous, or apertured, metal sheet that has a greater tensile in one direction than another and has edges extending in the one direction. During the drape procedure, the edges of the sheet that extend substantially in the direction in which the sheet has the greater tensile strength are allowed to slip relative to the draw ring and the pressure. As a result of this, the sheet is prevented from tearing.
REFERENCES:
patent: 2514005 (1950-07-01), Middleton
patent: 3668914 (1972-06-01), Vyacheslavovich et al.
Peters Mathias A. C.
VAN DE Kerkhof Marianus A. G.
VAN Denderen Adrianus J.
van der Waal Jan
Gilden Leon
Trifari Frank R.
U.S. Philips Corporation
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