Method for deep drawing

Details Method for deep drawing Method for deep drawing

B - Operations, Transporting

21

D

205/27

B21D 22/20 (2006.01) B29C 51/42 (2006.01)

Patent

CA 1148897

12629 A METHOD FOR DEEP DRAWING Abstract of the Disclosure A method for deep drawing sheet wherein (i) the sheet is formable by deep drawing and (ii) the sheet is in the form of a blank having a flange portion and a center portion comprising the following steps: (a) cooling the blank to a temperature no higher than about minus 50°C; (b) heating the flange portion to a temper- ature higher than the center portion and sufficient to establish a temperature differential between the flange portion and the center portion of about 40°C to about 150°C; and (c) drawing the blank into a concave deep drawing die using a mating convex punch, the center portion being initially at a temperature no higher than about 0°C and the drawing being effected at a speed sufficient to maintain the temperature differential established in step (b). S P E C I F I C A T I O N - 1 -

365130

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