Method of drape drawing a shadow mask for a color display tube

Details Method of drape drawing a shadow mask for a color display tube Method of drape drawing a shadow mask for a color display tube

1985-09-23

1987-08-11

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72364, 313402, B21D 2220

Patent

active

046853219

ABSTRACT:
Prior drape to drawing a nickel-iron alloy, etched-aperture sheet, it is subjected to an annealing treatment between 700.degree. and 820.degree. C. so as to produce complete recrystallization without grain growth of any significance. During the drawing process the sheet is maintained at a temperature between 150.degree. and 250.degree. C., a 0.2% proof stress of the shadow mask material between 150.degree. and 250.degree. C. being reached below a tensile stress of 150 .sup.N /mm.sup.2. Accurate reproduction of shadow masks is achieved with minimized detrition of the tooling.

REFERENCES:
patent: 3621699 (1971-11-01), Valeh et al.
patent: 4210843 (1980-07-01), Avadani
patent: 4528246 (1985-07-01), Higashinakagawa
patent: 4536226 (1985-08-01), Ohtake et al.

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