| 摘要 |
<p>12629 A METHOD FOR DEEP DRAWING 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.degree.C; (b) heating the flange portion to a temperature higher than the center portion and sufficient to establish a temperature differential between the flange portion and the center portion of about 40.degree.C to about 150.degree.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.degree.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</p> |
