Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1990-12-17
1992-06-09
Larson, Lowell A.
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72348, B21D 2210
Patent
active
051196581
ABSTRACT:
The subject of the present invention is a method for forming a sheet-metal blank (1), in particular in order to make a cathode ray tube mask, on a press, according to which the central part (1a) of the sheet-metal blank (1) is formed with a specified curvature under the effect of a punch (20) which deforms, in a mould (12), the upper die part (14), the load exerted on the punch (20) being distributed over the entire surface of the base (24) of the punch (20), and according to which, after the curving of the central part of the sheet-metal blank, a mechanical action is exerted on a peripheral forming member (30) so as to apply pressure to a ring (36), the ring (36) is deformed and presses against the free part (1b) of the sheet-metal blank (1) in order first to effect a controlled bending of the said free part, and then the said free part (1b) is applied, still under the action of the ring (36), along the side walls of the punch (20) in order to form the flanged edge.
REFERENCES:
patent: 2390803 (1945-12-01), Marschner
patent: 2859719 (1958-11-01), Kraybill
patent: 3183696 (1965-05-01), Way et al.
patent: 3234774 (1966-02-01), Margedant
patent: 4754635 (1988-07-01), van den Berg
Larson Lowell A.
Sollac
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