Drawing punch for drawing foil

Details Drawing punch for drawing foil Drawing punch for drawing foil

B - Operations, Transporting

29

C

18/1074

B29C 51/08 (2006.01) B21D 22/26 (2006.01) B29C 51/26 (2006.01)

Patent

CA 1202164

DRAWING PUNCH FOR DRAWING FOIL Abstract of the Disclosure A drawing punch for use in drawing foils in a die which converges in the direction of drawing. The punch has a rigid core, a cylindrical elastic body on the core and surrounding the core with a cavity therein around the core and opening out of the end of the body facing the direction of drawing. A rigid support member is provided on the core against which the other end of the body is supported. The radial cross-sectional area of the cylindrical elastic body increases from the first-mentioned end of the body toward the other end, and the peripheral surface of the cylindrical elastic body is at a positive angle to the axis of the punch of from 0 to 20°. The cavity has a volume which becomes zero just before the end of the stroke of the punch into the die.

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