Forming a shadow mask from a flat blank

Details Forming a shadow mask from a flat blank Forming a shadow mask from a flat blank

1984-06-18

1986-10-07

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72348, B21D 2200

Patent

active

046152059

ABSTRACT:
A punch and pad for forming a square planar shadow mask have curved outer edges. A pair of dies respectively receiving the punch and pad have straight inner edges. The dies clamp a flat shadow mask blank and the punch is lowered to only partially form the shadow mask. The mask is then unclamped and the punch is fully lowered towards the pad to complete the forming of the mask without wrinkles.

REFERENCES:
patent: 3195341 (1965-07-01), Zurnich
patent: 3296850 (1967-01-01), Fiore
patent: 3621699 (1971-11-01), Valek

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