Head forming method and resulting product

Details Head forming method and resulting product Head forming method and resulting product

B - Operations, Transporting

23

G

10/2

B23G 9/00 (2006.01) B21K 1/46 (2006.01) F16B 23/00 (2006.01)

Patent

CA 1048710

ABSTRACT A method of providing an undercut "bowtie" slot in the head of a fastener such as a screw or bolt, and the resulting interim and final fastener products. The method consists of only two heading steps, starting with either a preform or a simple blank. In the first heading step a forming blow is applied which produces a "bowtie" shaped slot having side walls that are not undercut and a single, continuous ellipsoidal bulge projecting upwardly from the head adjacent to and substantially coextensive with each edge of the slot. In the second heading step a forming blow is applied which compresses the material of the ellipsoidal bulges down into the head to form a radiused undercut slot con- figuration that is continuous and substantially coextensive with the length of the slot.

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