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

B - Operations, Transporting

21

D

316/12

B21D 22/00 (2006.01) B21D 22/02 (2006.01) B21D 35/00 (2006.01) H01J 9/14 (2006.01)

Patent

CA 1237168

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.

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