Patent ID: 6553805
Filing Date: 2003-04-29
Classification: B21D,Y10T

Abstract:
In a ductile material forming method, wherein a blank (26) is processed to a press-drawn part (42), the improvement for creating the blank comprising the steps of slitting a ductile material (28) on two separated segments of an inner perimeter around the blank to form two separated slit segments (14a,b) to define the blank with an area sufficient for press-drawing into a part, thereby leaving two spacing zones (16a,b) of un-slit material on the inner perimeter between the two separated slit segments, and slitting the material on two separated segments of an outer perimeter outside the inner perimeter around the blank to form two separated slit segments (18a,b), the two separated slit segments of the outer perimeter each having a slit (20a,b) that follows the inner perimeter and deviates toward a respective one of the two, spacing zones.